Battery and electrical device

Abstract

A battery and an electrical device. The battery comprises a box body, a battery cell and a heat conduction member for accommodating a heat exchange medium; an accommodating cavity of the box body comprises a top wall and a bottom wall which are provided opposite to each other in a vertical direction; the battery cell is accommodated in the accommodating cavity; the battery cell comprises an electrode terminal; the battery cell is fixed into the accommodating cavity and enables the electrode terminal to face the bottom wall of the accommodating cavity; the battery cell comprises a first wall, and the first wall is a wall of the battery cell having the largest area; the heat conduction member is provided in the accommodating cavity; the heat conduction member is provided opposite to and is in heat conduction connection to the first wall; the heat exchange medium exchanges heat with the battery cell by means of the heat conduction member.

Description

Batteries and electrical devices

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application is based on international patent application No. PCT / CN2022 / 077152, filed on February 21, 2022, international patent application No. PCT / CN2022 / 077153, filed on February 21, 2022, international patent application No. PCT / CN2022 / 077151, filed on February 21, 2022, international patent application No. PCT / CN2022 / 077147, filed on February 21, 2022, international patent application No. PCT / CN2022 / 077149, filed on February 21, 2022, and international patent application No. PCT / CN2022 / 077150. 150. International patent application with application number PCT / CN2022 / 098447 and filing date on February 21, 2022; international patent application with application number PCT / CN2022 / 098727 and filing date on June 14, 2022; international patent application with application number PCT / CN2022 / 099229 and filing date on June 16, 2022; international patent application with application number PCT / CN2022 / 100488 and filing date on June 22, 2022; international patent application with application number PCT / CN2022 / 100486 and filing date on June 22, 2022 Application, international patent application with application number PCT / CN2022 / 111347 and application date of August 10, 2022, international patent application with application number PCT / CN2022 / 099786 and application date of June 20, 2022, international patent application with application number PCT / CN2022 / 101392 and application date of June 27, 2022, international patent application with application number PCT / CN2022 / 101395 and application date of June 27, 2022, international patent application with application number PCT / CN2022 / 098355 and application date of June 13, 2022, and international patent application with application number PCT / CN2022 / 077998 , international patent application with application date of February 25, 2022, application number PCT / CN2022 / 098380, international patent application with application date of June 13, 2022, international patent application with application number PCT / CN2022 / 098343, international patent application with application date of June 13, 2022, international patent application with application number PCT / CN2022 / 098348, international patent application with application date of June 13, 2022, international patent application with application number PCT / CN2022 / 098373, international patent application with application date of June 13, 2022, international patent application with application number PCT / CN2022 / 098370, international patent application with application date of June 13, 2022,The present invention is based on and claims the priority of international patent applications No. PCT / CN2022 / 077993, filed on February 25, 2022, International patent application No. PCT / CN2022 / 101440, filed on June 27, 2022, International patent application No. PCT / CN2022 / 101406, filed on June 27, 2022, International patent application No. PCT / CN2022 / 101414, filed on June 27, 2022, International patent application No. PCT / CN2022 / 101517, filed on June 27, 2022, and International patent application No. PCT / CN2022 / 101393, filed on June 27, 2022. The entire contents of the above-mentioned international patent applications are hereby incorporated by reference into this application. , Technical Field

[0003] The present application relates to battery technology, and in particular to a battery and an electrical device. Background Art

[0004] In recent years, the emergence of new energy vehicles has played a huge role in promoting social development and environmental protection. Power batteries, as a rechargeable battery, are the power source of new energy vehicles and are widely used in the field of new energy vehicles.

[0005] In some cases, the energy density of the battery is not high, resulting in space waste, which in turn affects the performance of the electrical device; in addition, the existing batteries have poor rigidity and cannot directly withstand the load brought by other parts of the electrical device, which can easily cause safety accidents and affect the safety of the electrical device.

[0006] Furthermore, when increasing the energy density of batteries, it is also necessary to consider the thermal management performance of the battery. Therefore, how to improve the thermal management performance of batteries is also a technical problem that needs to be solved urgently in battery technology.

[0007] Summary of the Invention

[0008] This application aims to solve at least one of the technical problems existing in the related art. To this end, this application proposes a battery that can improve the energy density and safety of the battery while effectively ensuring heat conduction in the battery, thereby improving the thermal management performance of the battery.

[0009] The present application also provides an electrical device having the battery.

[0010] According to the battery of the embodiment of the first aspect of the present application, it includes: a box body, the box body has a accommodating cavity, the accommodating cavity includes a top wall and a bottom wall arranged opposite to each other in the vertical direction; a battery cell, the battery cell is accommodated in the accommodating cavity, the battery cell includes an electrode terminal, the battery cell is fixed to the accommodating cavity with the electrode terminal facing the bottom wall of the accommodating cavity, the battery cell includes a first wall, and the first wall is the wall with the largest area in the battery cell; a heat conductor for accommodating a heat exchange medium, the heat conductor is arranged in the accommodating cavity, the heat conductor is arranged opposite to the first wall and is thermally connected, and the heat exchange medium exchanges heat with the battery cell through the heat conductor.

[0011] In the above technical solution, the battery cell is arranged in the box body, and the electrode terminal is arranged toward the bottom wall, which can improve the safety of the battery; at the same time, the heat conductive member is thermally connected to the first wall of the battery cell, so as to effectively utilize the heat conductive member to conduct the heat of the battery cell, thereby improving the service life and safety performance of the battery cell, thereby improving the thermal management performance of the battery.

[0012] In some embodiments, the battery cell further includes a second wall connected to the first wall, the first wall and the second wall are arranged to intersect, and the electrode terminal is arranged on the second wall.

[0013] In some embodiments, the battery cell includes two first walls and two second walls arranged opposite to each other, and the electrode terminals are provided in at least two forms; at least two electrode terminals are provided on the same second wall; or each second wall is provided with at least one electrode terminal.

[0014] In some embodiments, the electrode terminal is provided on the first wall.

[0015] In some embodiments, there are multiple battery cells and they are arranged in a first direction. In the first direction, each battery cell is provided with a first surface opposite to the first wall, and the first surface is provided with an avoidance groove. The avoidance groove of one of the two adjacent battery cells is used to accommodate the electrode terminal of the other battery cell, and the first direction is perpendicular to the first wall.

[0016] In some embodiments, the first wall is formed into a cylindrical shape.

[0017] In some embodiments, a second wall is provided at both axial ends of the first wall, and at least one of the second walls is provided with the electrode terminal.

[0018] In some embodiments, one of the second walls is provided with an exposed electrode terminal, the electrode assembly includes a positive electrode sheet and a negative electrode sheet, one of the positive electrode sheet and the negative electrode sheet is electrically connected to the electrode terminal, and the other of the positive electrode sheet and the negative electrode sheet is electrically connected to the first wall or the other second wall.

[0019] In some embodiments, at least one of the battery cells is a pouch battery cell.

[0020] In some embodiments, the battery cell further includes a pressure relief mechanism, and the pressure relief mechanism and the electrode terminal are disposed on the same wall of the battery cell.

[0021] In some embodiments, the battery cell further includes a pressure relief mechanism, and the pressure relief mechanism and the electrode terminal are respectively disposed on two walls of the battery cell.

[0022] In some embodiments, the heat conducting member is bonded to the first wall via a first adhesive layer.

[0023] In some embodiments, the bottom of the heat conducting member is bonded to the bottom wall of the accommodating cavity via a second adhesive layer; and / or the bottom of the battery cell is bonded to the bottom wall of the accommodating cavity via a third adhesive layer.

[0024] In some embodiments, the thickness of the first adhesive layer is less than or equal to the thickness of the second adhesive layer; and / or the thickness of the first adhesive layer is less than or equal to the thickness of the third adhesive layer.

[0025] In some embodiments, the thermal conductivity of the first adhesive layer is greater than or equal to the thermal conductivity of the second adhesive layer; and / or the thermal conductivity of the first adhesive layer is greater than or equal to the thermal conductivity of the third adhesive layer.

[0026] In some embodiments, the ratio of the thickness of the first adhesive layer to the thermal conductivity of the first adhesive layer is a first ratio; the ratio of the thickness of the second adhesive layer to the thermal conductivity of the second adhesive layer is a second ratio; and the ratio of the thickness of the third adhesive layer to the thermal conductivity of the third adhesive layer is a third ratio; wherein the first ratio is less than or equal to the second ratio; and / or the first ratio is less than or equal to the third ratio.

[0027] In some embodiments, the heat conducting member includes a metal material and / or a non-metal material.

[0028] In some embodiments, the heat conducting member includes a metal plate and an insulating layer, and the insulating layer is disposed on a surface of the metal plate; alternatively, the heat conducting member is a non-metallic material plate.

[0029] In some embodiments, the battery cells are multiple and arranged along a second direction; the heat conductive member includes a partition extending along the second direction and connected to the first wall of each battery cell in the multiple battery cells, and the second direction is parallel to the first wall.

[0030] In some embodiments, the heat conducting member further includes an insulating layer, and the insulating layer is used to insulate and isolate the first wall of the battery cell from the separator.

[0031] In some embodiments, the thermal conductivity of the insulating layer is greater than or equal to 0.1 W / (m·K).

[0032] In some embodiments, a dimension T1 of the partition in a first direction is less than 0.5 mm, and the first direction is perpendicular to the first wall.

[0033] In some embodiments, a dimension T1 of the partition in a first direction is greater than 5 mm, and the first direction is perpendicular to the first wall.

[0034] In some embodiments, the surface of the heat conductor connected to the first wall is an insulating surface; wherein a dimension of the heat conductor in a first direction is 0.1 to 100 mm, and the first direction is perpendicular to the first wall.

[0035] In some embodiments, in the third direction, a size H1 of the partition and a size H2 of the first wall satisfy: 0.1≤H1 / H2≤2, and the third direction is perpendicular to the second direction and parallel to the first wall.

[0036] In some embodiments, a cavity is provided inside the partition.

[0037] In some embodiments, the cavity is used to accommodate a heat exchange medium to adjust the temperature of the battery cell.

[0038] In some embodiments, in a first direction, the size of the cavity is W, the capacity Q of the battery cell and the size W of the cavity satisfy: 1.0 Ah / mm≤Q / W≤400 Ah / mm, and the first direction is perpendicular to the first wall.

[0039] In some embodiments, the partition further includes a pair of heat conducting plates arranged opposite to each other along a first direction, the cavity is arranged between the pair of heat conducting plates, and the first direction is perpendicular to the first wall.

[0040] In some embodiments, the partition further includes reinforcing ribs, and the reinforcing ribs are arranged between the pair of heat conducting plates.

[0041] In some embodiments, the reinforcing rib is connected to at least one of the pair of heat conducting plates.

[0042] In some embodiments, the reinforcing rib includes a first reinforcing rib, both ends of the first reinforcing rib are respectively connected to the pair of heat conducting plates, and the first reinforcing rib is arranged to be inclined relative to the first direction.

[0043] In some embodiments, the angle between the first reinforcing rib and the first direction is in the range of 30°-60°.

[0044] In some embodiments, the reinforcing rib further includes a second reinforcing rib, one end of the second reinforcing rib is connected to one of the pair of heat conducting plates, and the other end of the second reinforcing rib is spaced apart from the other of the pair of heat conducting plates.

[0045] In some embodiments, the second reinforcing rib extends along the first direction and protrudes from one of the pair of heat conducting plates.

[0046] In some embodiments, the first reinforcing rib and the second reinforcing rib are spaced apart.

[0047] In some embodiments, in the first direction, a thickness D of the heat conducting plate and a size W of the cavity satisfy: 0.01≤D / W≤25.

[0048] In some embodiments, the partition is provided with a medium inlet and a medium outlet, the cavity is connected to the medium inlet and the medium outlet, and a cavity is provided inside the partition that is disconnected from both the medium inlet and the medium outlet.

[0049] In some embodiments, a partition is provided in the cavity, and the partition is used to separate the cavity into at least two flow channels.

[0050] In some embodiments, the heat conducting member includes a first heat conducting plate, a second heat conducting plate and the separator that are stacked together, the separator is arranged between the first heat conducting plate and the second heat conducting plate, the first heat conducting plate and the separator jointly define a first flow channel, and the second heat conducting plate and the separator jointly define a second flow channel.

[0051] In some embodiments, at least a portion of the thermally conductive member is configured to deform when compressed.

[0052] In some embodiments, the heat conducting element includes: a heat exchange layer and a compressible layer arranged in a stacked manner; the elastic modulus of the compressible layer is smaller than the elastic modulus of the heat exchange layer.

[0053] In some embodiments, the compressible layer includes a compressible cavity filled with a phase change material or an elastic material.

[0054] In some embodiments, the heat conductor includes a shell and a supporting component, the supporting component is accommodated in the shell and is used to define a separate cavity and a deformation cavity in the shell, the cavity is used for the flow of heat exchange medium, and the deformation cavity is configured to be deformable when the shell is under pressure.

[0055] In some embodiments, the heat conductor includes a shell and an isolation assembly, wherein the isolation assembly is accommodated in the shell and connected to the shell to form a cavity between the shell and the isolation assembly, wherein the cavity is used for the flow of heat exchange medium, and the isolation assembly is configured to be deformable when the shell is under pressure.

[0056] In some embodiments, the heat conducting member is provided with an escape structure, and the escape structure is used to provide space for the expansion of the battery cell.

[0057] In some embodiments, the battery cells are provided in plurality, and at least a portion of the avoidance structure is located between two adjacent battery cells and is used to provide space for expansion of at least one of the battery cells.

[0058] In some embodiments, in a first direction, the heat conducting member includes a first heat conducting plate and a second heat conducting plate arranged opposite to each other, a cavity is provided between the first heat conducting plate and the second heat conducting plate, the cavity is used to accommodate a heat exchange medium, and along the first direction, at least one of the first heat conducting plate and the second heat conducting plate is recessed in a direction close to the other to form the avoidance structure, and the first direction is perpendicular to the first wall.

[0059] In some embodiments, a battery pack is provided in the box, and the number of the battery packs is more than two and arranged along a first direction. Each battery pack includes more than two battery cells arranged along a second direction, and the second direction is perpendicular to the first direction, and the first direction is perpendicular to the first wall.

[0060] In some embodiments, the heat conductive member is sandwiched between two adjacent battery groups.

[0061] In some embodiments, the battery further comprises a connecting tube group, a cavity for accommodating a heat exchange medium is provided in the heat conductive member, and the connecting tube group is used to connect the cavities of two or more heat conductive members.

[0062] In some embodiments, the connecting pipe group includes a connecting channel, an inlet pipe and an outlet pipe. Along the first direction, the cavities of two adjacent heat-conducting components are connected through the connecting channel, and the inlet pipe and the outlet pipe are connected to the cavity of the same heat-conducting component.

[0063] In some embodiments, the box includes a main body and a bottom cover arranged at the bottom of the main body, and the bottom cover is sealed with the main body to form the closed accommodating cavity.

[0064] In some embodiments, a wall of the bottom cover facing the battery cell constitutes the bottom wall of the accommodating cavity.

[0065] In some embodiments, the bottom cover is detachably connected to the bottom of the main body.

[0066] In some embodiments, the bottom cover has a characteristic surface facing the receiving cavity, and the characteristic surface is configured as a plane.

[0067] In some embodiments, a supporting member is provided on the top of the box, and the battery cells are provided on a surface of the supporting member.

[0068] In some embodiments, a wall of the carrier facing the battery constitutes the top wall of the accommodating cavity.

[0069] In some embodiments, the minimum thickness H of the carrier and the weight M1 of the battery satisfy the following relationship: 0.0002 mm / kg<H / M1≤0.2 mm / kg.

[0070] In some embodiments, the supporting member is used to define the accommodating cavity, and the battery cell is suspended from the supporting member.

[0071] In some embodiments, the battery cells are bonded to the carrier.

[0072] In some embodiments, an outer surface of the battery cell facing the carrier is a first outer surface, and the electrode terminal is arranged on an outer surface of the battery cell except the first outer surface.

[0073] In some embodiments, the battery cell has a second outer surface opposite to the first outer surface, and the electrode terminal is disposed on the second outer surface.

[0074] In some embodiments, there are multiple battery cells, and the multiple battery cells are arranged in a second direction, and the second direction is perpendicular to the vertical direction; the carrier is connected to the top walls of the multiple battery cells, and the battery cells are located below the carrier, and the relationship between the dimension N of the carrier in the vertical direction and the weight M2 of the battery cells satisfies: 0.04mm / kg≤N / M2≤100mm / kg.

[0075] In some embodiments, a cavity is provided inside the carrier.

[0076] In some embodiments, the cavity is used to accommodate a heat exchange medium to adjust the temperature of the battery cell.

[0077] In some embodiments, in the vertical direction, a surface of the carrier away from the battery cell is provided with reinforcing ribs.

[0078] In some embodiments, the carrier has a carrier surface facing the accommodating cavity, and the carrier surface is configured as a plane.

[0079] In some embodiments, the supporting member has a supporting portion and a connecting portion, the connecting portion is enclosed and connected to the edge of the supporting portion, the supporting portion is used to define the accommodating cavity, and the connecting portion is connected to the portion of the box body other than the supporting member; wherein, the inner surface of the supporting portion facing the accommodating cavity forms the supporting surface.

[0080] In some embodiments, the supporting portion is arranged to protrude in a direction away from the accommodating cavity compared to the connecting portion.

[0081] In some embodiments, the box body includes a bottom cover and a frame, the frame encloses an enclosed space that is set through at both ends in the vertical direction, the bottom cover and the supporting member respectively cover the opposite ends of the enclosed space in the vertical direction, and the bottom cover, the frame and the supporting member together enclose to form the accommodating cavity.

[0082] In some embodiments, the battery cell is inverted in the box with the end cover facing the bottom wall, the end cover is provided with a pressure relief mechanism and the electrode terminal, and the pressure relief mechanism and the electrode terminal are both arranged towards the bottom wall.

[0083] In some embodiments, the battery also includes a connecting plate and a connector, the connecting plate is arranged on one side of the box body and protrudes in the horizontal direction, the connecting plate and the bottom wall form a accommodating portion in the vertical direction, the connector is arranged in the accommodating portion and connected to the connecting plate, and the connector is electrically connected to the battery cell.

[0084] In some embodiments, the battery further includes a protection component disposed between the battery cell and the bottom wall to support the battery cell.

[0085] In some embodiments, the battery further includes a busbar component, which is used to electrically connect to the electrode terminals of at least two of the battery cells. The protective component is arranged between the bottom wall and the busbar component, and is used to insulate the battery cells from the bottom wall.

[0086] In some embodiments, the protection assembly includes a protection bar, and the protection bar abuts against the battery cell.

[0087] In some embodiments, the protective strip is fixedly connected to the battery cell and / or the box.

[0088] In some embodiments, the protective strip is bonded to the battery cell and / or the casing.

[0089] In some embodiments, a plurality of the protection bars are provided, and the plurality of protection bars are spaced apart in the second direction and extend along the first direction, and the first direction and the second direction are perpendicular to the vertical direction in pairs.

[0090] In some embodiments, the protection assembly further includes a main board, the protection strip is connected to the main board, and the main board is located between the protection strip and the bottom wall.

[0091] In some embodiments, the main board abuts against the bottom wall.

[0092] In some embodiments, the main board is fixedly connected to the bottom wall.

[0093] In some embodiments, the main board and the protective strip are integrally formed or detachably connected.

[0094] In some embodiments, the end cover of the battery cell includes a functional area and a shoulder, the functional area is provided with the electrode terminal, the shoulders are located on both sides of the functional area along the second direction, the battery cell abuts against the protective bar through the shoulders, and the second direction is perpendicular to the vertical direction.

[0095] In some embodiments, in the vertical direction, a thickness of the protection strip is greater than an extension height of a portion of the electrode terminal exposed from the battery cell.

[0096] In some embodiments, the protective strip abuts against the electrode terminal, or the protective strip is spaced apart from the electrode terminal.

[0097] In some embodiments, the orthographic projection of the electrode terminal on the bottom wall is located between the orthographic projections of adjacent protection strips on the bottom wall.

[0098] In some embodiments, the electrode terminals of two adjacent battery cells are electrically connected through a busbar component, and in the first direction, the extension length of one of the two adjacent protective strips is smaller than the extension length of the other to form an avoidance gap, which is used to avoid the busbar component.

[0099] In some embodiments, the battery cell further includes a pressure relief mechanism, which is disposed on the same side as the electrode terminal, and the orthographic projection of the pressure relief mechanism on the bottom wall is located between the orthographic projections of adjacent protective strips on the bottom wall.

[0100] In some embodiments, in the vertical direction, there is a first distance H3 between the end cover and the bottom wall of the battery cell, and the first distance H3 satisfies 2mm<H3<30mm.

[0101] In some embodiments, a ratio H3 / M2 of the first distance H3 to the weight M2 of a single battery cell satisfies 0.2 mm / Kg < H3 / M2 < 50 mm / Kg.

[0102] In some embodiments, the battery cell further includes a battery box, the electrode assembly is accommodated in the battery box, and the battery box is provided with a pressure relief mechanism, which is integrally formed with the battery box.

[0103] In some embodiments, the battery box includes an integrally formed non-weak area and a weak area, the battery box is provided with a groove portion, the non-weak area is formed around the groove portion, the weak area is formed at the bottom of the groove portion, the weak area is configured to be destroyed when the battery cell releases internal pressure, and the pressure relief mechanism includes the weak area.

[0104] In some embodiments, the average grain size of the weak area is S1, and the average grain size of the non-weak area is S2, satisfying: 0.05≤S1 / S2≤0.9.

[0105] In some embodiments, the minimum thickness of the weak area is A1, satisfying: 1≤A1 / S1≤100.

[0106] In some embodiments, the minimum thickness of the weak area is A1, and the hardness of the weak area is B1, satisfying: 5HBW / mm≤B1 / A1≤10000HBW / mm.

[0107] In some embodiments, the hardness of the weak area is B1, and the hardness of the non-weak area is B2, satisfying: 1<B1 / B2≤5.

[0108] In some embodiments, the minimum thickness of the weak area is A1, and the minimum thickness of the non-weak area is A2, satisfying: 0.05≤A1 / A2≤0.95.

[0109] In some embodiments, the electrode assembly includes a positive electrode sheet and a negative electrode sheet, the positive electrode sheet and / or the negative electrode sheet includes a current collector and an active material layer, the current collector includes a support layer and a conductive layer, the support layer is used to support the conductive layer, and the conductive layer is used to support the active material layer.

[0110] In some embodiments, along the thickness direction of the supporting layer, the conductive layer is disposed on at least one side of the supporting layer.

[0111] In some embodiments, the room temperature thin film resistance R S Satisfies: 0.016Ω / □≤R S ≤420Ω / □.

[0112] In some embodiments, the conductive layer is made of at least one material selected from aluminum, copper, titanium, silver, nickel-copper alloy, and aluminum-zirconium alloy.

[0113] In some embodiments, the material of the support layer includes one or more polymer materials and polymer-based composite materials.

[0114] In some embodiments, the thickness d1 of the supporting layer and the transmittance k of the supporting layer satisfy: when 12μm≤d1≤30μm, 30%≤k≤80%; or, when 8μm≤d1<12μm, 40%≤k≤90%; or, when 1μm≤d1<8μm, 50%≤k≤98%.

[0115] In some embodiments, the electrode assembly includes a positive electrode sheet, the positive electrode sheet includes a positive electrode current collector and a positive electrode active material layer coated on the surface of the positive electrode current collector, the positive electrode active material layer includes a positive electrode active material, the positive electrode active material has a core and a shell covering the core, the core includes at least one of a ternary material, dLi2MnO3·(1-d)LiMO2 and LiMPO4, 0<d<1, the M includes one or more selected from Fe, Ni, Co, and Mn, the shell contains a crystalline inorganic substance, the full width at half maximum of the main peak of the crystalline inorganic substance measured using X-ray diffraction is 0-3°, and the crystalline inorganic substance includes one or more selected from metal oxides and inorganic salts.

[0116] In some embodiments, the shell includes at least one of the metal oxide and the inorganic salt, and carbon.

[0117] In some embodiments, the electrode assembly includes a positive electrode sheet, the positive electrode sheet includes a positive electrode current collector and a positive electrode active material layer coated on the surface of the positive electrode current collector, the positive electrode active material layer includes a positive electrode active material, the positive electrode active material has LiMPO4, M includes Mn, and a non-Mn element, and the non-Mn element satisfies at least one of the following conditions: the ionic radius of the non-Mn element is a, the ionic radius of the manganese element is b, and |a - b| / b is not greater than 10%; the variable valence voltage of the non-Mn element is U, 2V < U < 5.5V; the chemical activity of the chemical bond formed by the non-Mn element and O is not less than the chemical activity of the P-O bond; the highest valence of the non-Mn element is not greater than 6.

[0118] In some embodiments, the non-Mn element includes one or both of a first doping element and a second doping element, the first doping element is a doping at the manganese site, and the second doping element is a doping at the phosphorus site.

[0119] In some embodiments, the first doping element satisfies at least one of the following conditions: the ionic radius of the first doping element is a, the ionic radius of the manganese element is b, and |a - b| / b is not greater than 10%; the variable valence voltage of the first doping element is U, 2V < U < 5.5V.

[0120] In some embodiments, the second doping element satisfies at least one of the following conditions: the chemical activity of the chemical bond formed by the second doping element and O is not less than the chemical activity of the P-O bond; the highest valence of the second doping element is not greater than 6.

[0121] In some embodiments, the positive electrode active material further has a coating layer.

[0122] In some embodiments, the coating layer includes carbon.

[0123] In some embodiments, the carbon in the coating layer is a mixture of SP2-form carbon and SP3-form carbon.

[0124] In some embodiments, the molar ratio of the SP2-form carbon to the SP3-form carbon is any value within the range of 0.1 - 10.

[0125] According to the electrical device of the second aspect embodiment of the present application, it includes a battery according to the first aspect embodiment of the present application above, and the battery is used to provide electrical energy.

[0126] The additional aspects and advantages of the present application will be partially given in the following description, partially will become obvious from the following description, or will be understood through the practice of the present application. Description of the Drawings

[0127] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0128] FIG1 is a schematic diagram of an electric device according to an embodiment of the present application;

[0129] FIG2 is an exploded view of a battery according to one embodiment of the present application;

[0130] FIG3 is an exploded view of a battery according to another embodiment of the present application;

[0131] FIG4 is an exploded view of a battery cell according to one embodiment of the present application;

[0132] FIG5 is a schematic diagram of the battery cell shown in FIG4 ;

[0133] FIG6 is a schematic diagram of the arrangement of battery cells according to another embodiment of the present application;

[0134] FIG7 is an exploded view of a battery according to one embodiment of the present application;

[0135] FIG8 is a schematic diagram of the arrangement of the battery cells shown in FIG7;

[0136] FIG9 is a schematic diagram of a battery cell according to one embodiment of the present application;

[0137] FIG10 is a schematic diagram of a battery according to one embodiment of the present application;

[0138] FIG11 is a schematic diagram of the heat conducting member shown in FIG10 ;

[0139] FIG12 is a schematic diagram of the heat conducting member and a plurality of battery cells shown in FIG10 ;

[0140] FIG13 is another schematic diagram of the battery shown in FIG10;

[0141] FIG14 is a schematic diagram of a partial structure of a battery according to an embodiment of the present application;

[0142] FIG15 is another schematic diagram of the battery shown in FIG14;

[0143] FIG16 is a schematic diagram of the arrangement of the battery cells shown in FIG14;

[0144] FIG17 is a schematic diagram of a partial structure of a battery according to one embodiment of the present application;

[0145] FIG18 is another schematic diagram of the battery shown in FIG17;

[0146] FIG19 is another schematic diagram of the battery shown in FIG17;

[0147] FIG20 is a schematic diagram of a partial structure of a battery according to one embodiment of the present application;

[0148] FIG21 is a schematic diagram of the thermal management component shown in FIG20;

[0149] FIG22 is a cross-sectional view of the thermal management component shown in FIG21;

[0150] FIG23 is an enlarged view of the circled portion A in FIG22;

[0151] FIG24 is a cross-sectional view of a heat conducting member with a partition provided therein according to one embodiment of the present application;

[0152] FIG25 is an enlarged view of the circled portion B in FIG22;

[0153] FIG26 is an enlarged view of the circled portion C in FIG22 ;

[0154] FIG27 is a cross-sectional view of a heat conducting member according to one embodiment of the present application;

[0155] FIG28 is an enlarged view of the circled portion D in FIG27 ;

[0156] FIG29 is an enlarged view of the circled portion E in FIG27 ;

[0157] FIG30 is a schematic diagram of a partial structure of a battery according to one embodiment of the present application;

[0158] FIG31 is a partial cross-sectional view of the battery shown in FIG30;

[0159] FIG32 is an enlarged view of the circled portion F in FIG31 ;

[0160] FIG33 is a schematic diagram of various structures of a separator according to some embodiments of the present application;

[0161] FIG34 is an exploded view of a battery according to one embodiment of the present application;

[0162] FIG35 is a schematic diagram of a battery according to an embodiment of the present application

[0163] FIG36 is a schematic diagram of the connection between the battery cell and the thermal management component shown in FIG35;

[0164] FIG37 is a cross-sectional view taken along the AA direction in FIG36;

[0165] FIG38 is an enlarged view of the circled portion G in FIG37 ;

[0166] FIG39 is a schematic diagram of a battery according to one embodiment of the present application;

[0167] FIG40 is an exploded view of a battery according to one embodiment of the present application;

[0168] FIG41 is an exploded view of a battery according to one embodiment of the present application;

[0169] FIG42 is a schematic diagram of a battery according to one embodiment of the present application;

[0170] FIG43 is another schematic diagram of the battery shown in FIG42;

[0171] FIG44 is another schematic diagram of the battery shown in FIG42;

[0172] FIG45 is a cross-sectional view taken along line BB in FIG44 ;

[0173] FIG46 is a schematic diagram of a battery according to one embodiment of the present application;

[0174] FIG47 is a schematic diagram of the heat conducting member shown in FIG46;

[0175] FIG48 is a cross-sectional view of the main body plate shown in FIG47;

[0176] FIG49 is another cross-sectional view of the main body panel shown in FIG47;

[0177] FIG50 is a cross-sectional view of a main body plate according to one embodiment of the present application;

[0178] FIG51 is a cross-sectional view of a main body plate according to one embodiment of the present application;

[0179] FIG52 is a schematic diagram of a heat conducting member according to one embodiment of the present application;

[0180] FIG53 is a cross-sectional view of a heat conducting member according to one embodiment of the present application;

[0181] FIG54 is another cross-sectional view of the heat conducting member in FIG53;

[0182] FIG55 is a cross-sectional view of a separator according to one embodiment of the present application;

[0183] FIG56 is a cross-sectional view of a heat conducting member according to one embodiment of the present application;

[0184] FIG57 is a cross-sectional view of a separator according to one embodiment of the present application;

[0185] FIG58 is a cross-sectional view of a heat conducting member according to one embodiment of the present application;

[0186] FIG59 is a schematic diagram of a separator according to one embodiment of the present application;

[0187] FIG60 is a cross-sectional view of a heat conducting member according to one embodiment of the present application;

[0188] FIG61 is a cross-sectional view of a battery according to one embodiment of the present application;

[0189] FIG62 is a cross-sectional view of a battery according to one embodiment of the present application;

[0190] FIG63 is a cross-sectional view of a battery according to one embodiment of the present application;

[0191] FIG64 is a cross-sectional view of a battery according to one embodiment of the present application;

[0192] FIG65 is a schematic diagram of a heat conducting member according to one embodiment of the present application;

[0193] FIG66 is a cross-sectional view of a heat conducting member according to one embodiment of the present application;

[0194] FIG67 is a cross-sectional view of a heat conducting member according to one embodiment of the present application;

[0195] FIG68 is a cross-sectional view of a heat conducting member according to one embodiment of the present application;

[0196] FIG69 is a cross-sectional view of a heat conducting member according to one embodiment of the present application;

[0197] FIG70 is a cross-sectional view of a heat conducting member according to one embodiment of the present application;

[0198] FIG71 is a schematic diagram of a compressible chamber according to one embodiment of the present application;

[0199] FIG72 is a partial schematic diagram of a heat conducting member according to one embodiment of the present application;

[0200] FIG73 is another schematic diagram of the heat conducting member shown in FIG72;

[0201] FIG74 is a schematic diagram of a heat conducting member according to one embodiment of the present application;

[0202] FIG75 is a schematic diagram of a heat conducting member according to one embodiment of the present application;

[0203] FIG76 is a schematic diagram of a heat conducting member according to one embodiment of the present application;

[0204] FIG77 is a schematic diagram of a heat conducting member according to one embodiment of the present application;

[0205] FIG78 is a schematic diagram of a heat conducting member according to one embodiment of the present application;

[0206] FIG79 is an exploded view of a heat conducting member according to one embodiment of the present application;

[0207] FIG80 is a schematic diagram of the current collecting element shown in FIG79;

[0208] FIG81 is a schematic diagram of a battery according to one embodiment of the present application;

[0209] FIG82 is a schematic diagram of a heat conducting member according to one embodiment of the present application;

[0210] FIG83 is a schematic diagram of a heat conducting member according to one embodiment of the present application;

[0211] FIG84 is an enlarged view of the circled portion H in FIG83;

[0212] FIG85 is a schematic diagram of a battery according to one embodiment of the present application;

[0213] FIG86 is a schematic diagram of a heat conducting member according to one embodiment of the present application;

[0214] FIG87 is another schematic diagram of the heat conducting member shown in FIG86;

[0215] FIG88 is a schematic diagram of a heat conducting member according to one embodiment of the present application;

[0216] FIG89 is an enlarged view of the circled portion I in FIG87;

[0217] FIG90 is an enlarged view of the circled portion J in FIG88;

[0218] FIG91 is another schematic diagram of the heat conducting member in FIG90;

[0219] FIG92 is a schematic diagram of a heat conducting member according to one embodiment of the present application;

[0220] FIG93 is a schematic diagram of a heat conducting member according to one embodiment of the present application;

[0221] FIG94 is an enlarged view of the circled portion K in FIG93;

[0222] FIG95 is a schematic diagram of a heat conducting member according to one embodiment of the present application;

[0223] FIG96 is an enlarged view of the circled L portion in FIG95;

[0224] FIG97 is a partial schematic diagram of a heat conducting member according to one embodiment of the present application;

[0225] FIG98 is a partial schematic diagram of a heat conducting member according to one embodiment of the present application;

[0226] FIG99 is a schematic diagram of a heat conducting member according to one embodiment of the present application;

[0227] FIG100 is a schematic diagram of a battery according to one embodiment of the present application;

[0228] FIG101 is an exploded view of the battery shown in FIG100;

[0229] FIG102 is a schematic diagram of a battery according to one embodiment of the present application;

[0230] FIG103 is a schematic diagram of a heat conducting member according to one embodiment of the present application;

[0231] FIG104 is a schematic diagram of a heat conducting member according to one embodiment of the present application;

[0232] FIG105 is a schematic diagram of a heat conducting member according to one embodiment of the present application;

[0233] FIG106 is a schematic diagram of a heat conducting member according to one embodiment of the present application;

[0234] FIG107 is a schematic diagram of a battery according to one embodiment of the present application;

[0235] FIG108 is a schematic diagram of a battery according to one embodiment of the present application;

[0236] FIG109 is a schematic diagram of a battery according to one embodiment of the present application;

[0237] FIG110 is a schematic diagram of a battery cell according to one embodiment of the present application;

[0238] FIG111 is a schematic diagram of a battery according to one embodiment of the present application;

[0239] FIG112 is a schematic diagram of a battery according to one embodiment of the present application;

[0240] FIG113 is a schematic diagram of the heat conducting member shown in FIG112;

[0241] FIG114 is a schematic diagram of a heat conducting member according to one embodiment of the present application;

[0242] FIG115 is another schematic diagram of the heat conducting member in FIG114;

[0243] FIG116 is a schematic diagram of the structure of a battery provided in some embodiments of the present application;

[0244] FIG117 is an exploded view of the battery shown in FIG116;

[0245] FIG118 is a schematic structural diagram of a bottom cover provided in some embodiments of the present application;

[0246] FIG119 is a top view of the bottom cover shown in FIG118;

[0247] FIG120 is a front view of the bottom cover shown in FIG118;

[0248] FIG121 is a schematic structural diagram of a bottom cover provided in some other embodiments of the present application;

[0249] FIG122 is a cross-sectional view of the battery shown in FIG116;

[0250] FIG123 is a schematic diagram of an orthographic projection of the bottom cover shown in FIG120 in the vertical direction;

[0251] FIG124 is a schematic diagram of the appearance of a battery cell in some embodiments of the present application;

[0252] FIG125 is a front view of the battery cell shown in FIG124;

[0253] FIG126 is a schematic structural diagram of a carrier in some embodiments of the present application;

[0254] FIG127 is a schematic structural diagram of a carrier in some other embodiments of the present application;

[0255] FIG128 is an orthographic projection of the bearing member shown in FIG127 in the vertical direction;

[0256] FIG129 is a front view of the battery shown in FIG116;

[0257] FIG130 is a schematic diagram of a battery applied to a vehicle body in some embodiments of the present application;

[0258] Fig. 131 is a schematic diagram of the battery shown in Fig. 130;

[0259] FIG132 is a diagram of a first exploded state of the structure shown in FIG130;

[0260] FIG133 is a diagram of a second exploded state of the structure shown in FIG130;

[0261] FIG134 is a schematic diagram of the installation relationship between the battery and the vehicle body in some embodiments of the present application;

[0262] FIG135 is a schematic diagram of a battery provided by some embodiments of the present application;

[0263] FIG136 is a schematic structural diagram of a carrier according to some embodiments of the present application;

[0264] FIG137 is a schematic structural diagram of a carrier according to some embodiments of the present application;

[0265] FIG138 is a schematic structural diagram of a carrier according to some embodiments of the present application;

[0266] FIG139 is a schematic structural diagram of a carrier according to some embodiments of the present application;

[0267] FIG140 is a schematic structural diagram of a carrier according to some embodiments of the present application;

[0268] FIG141 is a schematic diagram of the structure of a battery according to some embodiments of the present application;

[0269] FIG142 is a schematic structural diagram of a battery according to an embodiment of the present application;

[0270] FIG143 is a schematic diagram of the battery module shown in FIG142;

[0271] FIG144 is a schematic diagram of the cooperation between a battery cell and a heat conducting member according to some embodiments of the present application;

[0272] FIG145 is a schematic diagram of the cooperation between a battery cell and a heat conducting member according to some embodiments of the present application;

[0273] FIG146 is a schematic diagram of the cooperation between a battery cell and a heat conducting member according to some embodiments of the present application;

[0274] FIG147 is an exploded view of a battery according to some embodiments of the present application;

[0275] FIG148 is a schematic structural diagram of the protective assembly of the battery shown in FIG147;

[0276] FIG149 is a schematic cross-sectional view of the battery shown in FIG147 ;

[0277] FIG150 is an enlarged schematic diagram of FIG149 at the circle B;

[0278] FIG151 is a schematic structural diagram of a collision test device A for performing a collision test on a battery according to some embodiments of the present application;

[0279] FIG152 is a schematic diagram of the arrangement of electrode terminals according to some embodiments of the present application;

[0280] FIG153 is a schematic diagram of the cooperation between a battery cell and a heat conducting member according to some embodiments of the present application;

[0281] FIG154 is a schematic diagram of the structure of a housing provided in some embodiments of the present application;

[0282] FIG155 is a CC sectional view of the housing shown in FIG154;

[0283] [Corrected 03.03.2023 in accordance with Rule 91] Figure 156 is a grain map (schematic diagram) of the housing shown in Figure 155;

[0284] FIG157 is a partial enlarged view of the portion E of the housing shown in FIG155;

[0285] FIG158 is a partial enlarged view of a housing provided in some other embodiments of the present application;

[0286] [Corrected 03.03.2023 according to Rule 91] Figure 159 is a schematic structural diagram of a housing provided in still other embodiments of the present application (showing the primary scoring groove);

[0287] [Corrected 03.03.2023 according to Rule 91] Figure 160 is a sectional view EE of the housing shown in Figure 159;

[0288] FIG161 is a schematic structural diagram of a housing provided in still other embodiments of the present application (showing a primary scoring groove);

[0289] FIG162 is a sectional view taken along line FF of the housing shown in FIG161;

[0290] FIG163 is a schematic structural diagram of a housing provided in some other embodiments of the present application (showing a primary scoring groove);

[0291] FIG164 is a cross-sectional view taken along line GG of the housing shown in FIG163;

[0292] FIG165 is a schematic structural diagram of a housing provided in yet other embodiments of the present application (showing two-stage scoring grooves);

[0293] [Corrected 03.03.2023 according to Rule 26] Figure 166 is a KK sectional view of the housing shown in Figure 165;

[0294] FIG167 is a schematic structural diagram of a housing provided in still other embodiments of the present application (showing two-stage scoring grooves);

[0295] FIG168 is a sectional view taken along line MM of the housing shown in FIG167;

[0296] FIG169 is a schematic structural diagram of a housing provided in some other embodiments of the present application (showing two-stage scoring grooves);

[0297] FIG170 is a sectional view taken along line NN of the housing shown in FIG169;

[0298] FIG171 is an isometric view of a housing provided by some embodiments of the present application;

[0299] FIG172 is a schematic structural diagram of the housing shown in FIG171 (showing the primary scoring groove and the primary sinking groove);

[0300] FIG173 is a cross-sectional view taken along line OO of the housing shown in FIG172;

[0301] FIG174 is a schematic structural diagram of a housing provided in some further embodiments of the present application (showing a primary scoring groove and a primary sinking groove);

[0302] FIG175 is a PP cross-sectional view of the housing shown in FIG074;

[0303] FIG176 is a schematic structural diagram of a housing provided in some other embodiments of the present application (showing a primary scoring groove and a primary sinking groove);

[0304] FIG177 is a QQ cross-sectional view of the housing component shown in FIG176;

[0305] FIG178 is a schematic diagram of the structure of a housing provided by some embodiments of the present application (showing a primary scoring groove and a two-stage sinking groove);

[0306] FIG179 is a cross-sectional view taken along line RR of the housing member shown in FIG178;

[0307] FIG180 is a schematic structural diagram of a housing provided in some further embodiments of the present application (showing a primary scoring groove and a two-stage sinking groove);

[0308] FIG181 is a SS cross-sectional view of the housing shown in FIG180;

[0309] FIG182 is a schematic structural diagram of a housing component provided in some other embodiments of the present application (showing a primary scoring groove and a two-stage sinking groove);

[0310] FIG183 is a TT cross-sectional view of the housing shown in FIG182;

[0311] [Corrected 03.03.2023 according to Rule 91] Figure 184 is a schematic structural diagram of a housing provided in another embodiment of the present application;

[0312] FIG185 is a grain diagram (schematic diagram) of a housing provided in some other embodiments of the present application;

[0313] FIG186 is a schematic diagram of the structure of an end cap provided in some embodiments of the present application;

[0314] FIG187 is a schematic structural diagram of a housing provided in some embodiments of the present application;

[0315] FIG188 is a schematic structural diagram of a housing provided in some other embodiments of the present application;

[0316] FIG189 is a schematic structural diagram of a battery cell provided by some embodiments of the present application;

[0317] FIG190 is a schematic diagram of the structure of a positive electrode current collector according to a specific embodiment of the present application;

[0318] FIG191 is a schematic structural diagram of a positive electrode current collector according to another specific embodiment of the present application;

[0319] FIG192 is a schematic diagram of the structure of a negative electrode current collector according to a specific embodiment of the present application;

[0320] FIG193 is a schematic structural diagram of a negative electrode current collector according to another specific embodiment of the present application;

[0321] FIG194 is a schematic structural diagram of a positive electrode sheet according to a specific embodiment of the present application;

[0322] FIG195 is a schematic structural diagram of a positive electrode sheet according to another specific embodiment of the present application;

[0323] FIG196 is a schematic structural diagram of a negative electrode sheet according to a specific embodiment of the present application;

[0324] FIG197 is a schematic structural diagram of a negative electrode sheet according to another embodiment of the present application;

[0325] Figure 198 is a schematic diagram of a nail penetration experiment of the present application;

[0326] Figure 199 shows the temperature change curves of lithium-ion battery 1# and lithium-ion battery 4# after a nail penetration test;

[0327] FIG200 shows the voltage variation curves of lithium-ion battery 1# and lithium-ion battery 4# after a nail penetration test;

[0328] FIG201 is an X-ray diffraction pattern (XRD) of undoped LiMnPO4 and the positive electrode active material prepared in Example 2;

[0329] FIG202 is an X-ray energy dispersive spectrum (EDS) diagram of the positive electrode active material prepared in Example 2;

[0330] FIG203 is a schematic diagram of a positive electrode active material having a core-shell structure described in the present application;

[0331] FIG204 is a schematic diagram of a positive electrode active material having a core-shell structure according to one embodiment of the present application;

[0332] FIG205 is a schematic diagram of a heat conducting member and a separator provided in some embodiments of the present application;

[0333] Figure 206 is a schematic diagram of the thermal conductor and multiple battery cells shown in Figure 205. DETAILED DESCRIPTION

[0334] The following detailed description of the embodiments of the present application is provided in conjunction with the accompanying drawings and examples. The following detailed description of the embodiments and the accompanying drawings are used to illustrate the principles of the present application, but are not intended to limit the scope of the present application, i.e., the present application is not limited to the described embodiments.

[0335] Throughout the description of this application, it should be noted that, unless otherwise specified, all technical and scientific terms used have the same meanings as commonly understood by one skilled in the art to which this application belongs. The terms used are for the purpose of describing specific embodiments only and are not intended to limit this application. The terms "including," "having," and any variations thereof in the specification and claims of this application and the accompanying drawings are intended to cover non-exclusive inclusions. "Multiple" means more than two. Terms such as "upper," "lower," "left," "right," "inner," and "outer" to indicate positions or relationships are intended solely for the purpose of describing this application and simplifying the description. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation, and are therefore not to be construed as limitations on this application. Furthermore, the terms "first," "second," and "third," etc., are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. "Perpendicular" does not mean perpendicular in the strict sense, but rather refers to positions within an acceptable range of error. "Parallel" does not mean parallel in the strict sense, but rather refers to positions within an acceptable range of error.

[0336] References to "embodiments" in this application mean that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described in this application may be combined with other embodiments.

[0337] The directional words appearing in the following description are all directions shown in the figures, and do not limit the specific structure of this application. In the description of this application, it should also be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected, or indirectly connected through an intermediate medium, or it can be internal communication between two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0338] In this application, the term "and / or" is merely a description of the association relationship between associated objects, indicating that three relationships can exist. For example, A and / or B can represent three situations: A exists alone, A and B exist at the same time, and B exists alone. Unless otherwise specified, the term "or" in this application is inclusive. For example, the phrase "A or B" means "A, B, or both A and B"; more specifically, any of the following conditions satisfies the condition "A or B": A is true (or exists) and B is false (or does not exist); or A is false (or does not exist) and B is true (or exists); or both A and B are true (or exist).

[0339] Unless otherwise specified, the terms "include" and "comprising" used in this application may be open-ended or closed-ended. For example, "include" and "comprising" may mean that other components not listed may also be included or that only the listed components are included.

[0340] The “ranges” disclosed herein are defined in terms of lower and upper limits, where a given range is defined by selecting a lower limit and an upper limit, the selected lower limit and upper limit defining the boundaries of a particular range. Ranges defined in this manner may be inclusive or exclusive of the end values ​​and may be combined arbitrarily, i.e., any lower limit may be combined with any upper limit to form a range that is not explicitly stated; and any lower limit may be combined with other lower limits to form a range that is not explicitly stated, and similarly, any upper limit may be combined with any other upper limit to form a range that is not explicitly stated. Furthermore, although not explicitly stated, each point or individual value between the endpoints of a range is included in the range. Thus, each point or individual value may be combined as its own lower limit or upper limit with any other point or individual value or with other lower limits or upper limits to form a range that is not explicitly stated.

[0341] For example, if ranges of 60-120 and 80-110 are listed for a particular parameter, it is understood that ranges of 60-110 and 80-120 are also contemplated. Furthermore, if minimum range values ​​of 1 and 2 are listed, and if maximum range values ​​of 3, 4, and 5 are listed, the following ranges are all contemplated: 1-3, 1-4, 1-5, 2-3, 2-4, and 2-5. Throughout this application, unless otherwise indicated, the numerical range "ab" is a shorthand representation of any combination of real numbers between a and b, where a and b are both real numbers. For example, the numerical range "0-5" indicates that all real numbers between "0-5" are listed herein, and "0-5" is simply a shorthand representation of these numerical combinations. Furthermore, when a parameter is stated as an integer greater than or equal to 2, this is equivalent to disclosing that the parameter is, for example, an integer of 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, and so on. Throughout this application, "about" a numerical value indicates a range, meaning a range of ±10% of that value.

[0342] Unless otherwise specified, all embodiments and optional embodiments of the present application can be combined with each other to form a new technical solution. Unless otherwise specified, all technical features and optional technical features of the present application can be combined with each other to form a new technical solution. Unless otherwise specified, all steps of the present application can be performed sequentially or randomly, preferably sequentially. For example, the method includes steps (a) and (b), which means that the method may include steps (a) and (b) performed sequentially, or may include steps (b) and (a) performed sequentially. For example, it is mentioned that the method may also include step (c), which means that step (c) can be added to the method in any order, for example, the method may include steps (a), (b) and (c), or may include steps (a), (c) and (b), or may include steps (c), (a) and (b), etc.

[0343] It should be noted that, in this article, the terms "coating" and "coating" refer to a material layer coated on a core material such as lithium manganese phosphate. The material layer can completely or partially coat the core. The use of "coating" is simply for ease of description and is not intended to limit this application. In addition, each layer of coating can be completely coated or partially coated. Similarly, the term "thickness of coating" refers to the thickness of the material layer coated on the core in the core radial direction.

[0344] In this application, battery cells may include lithium-ion secondary batteries, lithium-ion primary batteries, lithium-sulfur batteries, sodium-lithium-ion batteries, sodium-ion batteries, or magnesium-ion batteries, etc., and the embodiments of this application do not limit this. Battery cells may be cylindrical, flat, rectangular, or other shapes, etc., and the embodiments of this application do not limit this. Battery cells are generally divided into three types based on the packaging method: cylindrical battery cells, prismatic battery cells, and soft-pack battery cells, and the embodiments of this application do not limit this.

[0345] The battery referred to in the embodiments of this application refers to a single physical module that includes one or more battery cells to provide higher voltage and capacity. For example, the battery referred to in this application may include a battery pack. A battery generally includes a housing that encloses one or more battery cells. The housing prevents liquids or other foreign matter from affecting the charging or discharging of the battery cells.

[0346] The housing 10 may include a first portion 101 and a second portion 102 (as shown in Figures 2 and 3). The first portion 101 and the second portion 102 overlap each other, and the first portion 101 and the second portion 102 together define a storage space for accommodating the battery cells 20. The second portion 102 may be a hollow structure with one end open, and the first portion 101 is a plate-like structure. The first portion 101 overlaps the open side of the second portion 102 to form a housing with a storage space. The first portion 101 and the second portion 102 may also both be hollow structures with one end open, and the open side of the first portion 101 overlaps the open side of the second portion 102 to form a housing with a storage space. Of course, the housing 10 may have various shapes, such as a cylinder, a rectangular parallelepiped, etc.

[0347] In order to improve the sealing performance after the first part 101 and the second part 102 are connected, a sealing member, such as a sealant, a sealing ring, etc., may also be provided between the first part 101 and the second part 102 .

[0348] The material of the box body 10 can be an alloy material such as aluminum alloy, iron alloy, etc., or a polymer material such as polycarbonate, polyisocyanurate foam plastic, etc., or a composite material such as glass fiber and epoxy resin.

[0349] A battery cell includes an electrode assembly and an electrolyte. The electrode assembly consists of a positive electrode sheet, a negative electrode sheet, and a separator. A battery cell primarily operates by the movement of metal ions between the positive and negative electrode sheets. The positive electrode sheet comprises a positive current collector and a positive active material layer. The positive active material layer is coated on the surface of the positive current collector. The current collector uncoated with the positive active material layer protrudes from the current collector coated with the positive active material layer, and the current collector uncoated with the positive active material layer serves as the positive electrode tab. For lithium-ion batteries, for example, the positive current collector can be made of aluminum, and the positive active material can be lithium cobalt oxide, lithium iron phosphate, ternary lithium, or lithium manganese oxide. The negative electrode sheet comprises a negative current collector and a negative active material layer. The negative active material layer is coated on the surface of the negative current collector. The current collector uncoated with the negative active material layer protrudes from the current collector coated with the negative active material layer, and the current collector uncoated with the negative active material layer serves as the negative electrode tab. The negative current collector can be made of copper, and the negative active material can be carbon or silicon, among others. In order to ensure that large current can pass without melting, there are multiple positive electrode tabs and they are stacked together, and there are multiple negative electrode tabs and they are stacked together.

[0350] There are no particular limitations on the aforementioned separator. Any known porous separator with electrochemical and chemical stability may be selected. For example, it may be a single-layer or multi-layer film of one or more of glass fiber, non-woven fabric, polyethylene, polypropylene, and polyvinylidene fluoride. The separator may be made of polypropylene (PP) or polyethylene (PE), among others. Furthermore, the electrode assembly may be a wound or laminated structure, but the embodiments of the present application are not limited thereto.

[0351] The above-mentioned electrolyte includes an organic solvent and an electrolyte salt, wherein the electrolyte salt plays the role of transporting ions between the positive and negative electrodes, and the organic solvent serves as a medium for transporting ions. The electrolyte salt can be an electrolyte salt known in the art for electrolytes of battery cells, such as LiPF6 (lithium hexafluorophosphate), LiBF4 (lithium tetrafluoroborate), LiClO4 (lithium perchlorate), LiAsF6 (lithium hexafluoroarsenate), LiFSI (lithium bis(trifluoromethanesulfonyl)imide), LiTFSI (lithium bis(trifluoromethanesulfonyl)imide), LiTFS (lithium trifluoromethanesulfonate), LiDFOB (lithium difluorooxalatoborate), LiBOB (lithium dioxalatoborate), LiPO2F2 (lithium difluorophosphate), LiDFOP (lithium difluorodioxalatophosphate) and LiTFOP (lithium tetrafluorooxalatophosphate); the organic solvent can be an organic solvent known in the art for electrolytes of battery cells, such as ethylene carbonate (EC), propylene carbonate, Ethyl ester (PC), ethyl methyl carbonate (EMC), diethyl carbonate (DEC), dimethyl carbonate (DMC), dipropyl carbonate (DPC), methyl propyl carbonate (MPC), ethyl propyl carbonate (EPC), butylene carbonate (BC), fluoroethylene carbonate (FEC), methyl formate (MF), methyl acetate (MA), ethyl acetate (EA), propyl acetate (PA), methyl propionate (MP), ethyl propionate (EP), propyl propionate (PP), methyl butyrate (MB), ethyl butyrate (EB), 1,4-butyrolactone (GBL), cyclopentane (SF), dimethyl sulfone (MSM), ethyl methyl sulfone (EMS) and diethyl sulfone (ESE) One or more, preferably two or more, can select suitable electrolyte salt and organic solvent according to actual needs.

[0352] Of course, the battery cell may not include electrolyte.

[0353] To meet different power requirements, a battery may include multiple battery cells, wherein the multiple battery cells can be connected in series, in parallel, or in a hybrid connection. Hybrid connection refers to a mixture of series and parallel connections. Alternatively, multiple battery cells can be first connected in series, in parallel, or in a hybrid connection to form a battery module, and multiple battery modules can then be connected in series, in parallel, or in a hybrid connection to form a battery. In other words, multiple battery cells can be directly combined into a battery, or they can first be combined into a battery module or battery pack, and the battery module or battery pack can then be combined into a battery. The battery is further disposed in an electrical device to provide electrical energy to the electrical device.

[0354] Currently, market developments indicate that power batteries are becoming increasingly widely used. They are not only used in energy storage systems such as hydropower, thermal, wind, and solar power plants, but are also widely used in electric vehicles like electric bicycles, electric motorcycles, and electric vehicles, as well as in military equipment and aerospace. As power battery applications continue to expand, market demand is also growing.

[0355] In the related art, the opening of the battery case is usually oriented vertically upward, the battery cells are fixed to the bottom of the battery, and the electrode terminals face the cover covering the opening of the case.

[0356] However, in the battery arranged as described above, the applicant noted that, since the bottom of the battery is bonded to the electrical device when it is arranged in the electrical device, and the battery cells are fixed to the bottom of the battery, the rigidity of the top of the battery, which is more susceptible to collisions, is poor. In addition, during a collision, the internal battery cells are subjected to uneven force, making the battery susceptible to damage, resulting in poor battery safety and affecting the battery's performance.

[0357] Furthermore, the battery generates a significant amount of heat during charging and discharging, especially during fast charging, where the battery cells generate significant heat. This heat accumulates and accumulates, causing the battery temperature to rise dramatically. If the heat from the battery cells cannot be dissipated promptly, it can lead to thermal runaway, resulting in safety hazards such as smoke, fire, and explosion. Furthermore, long-term and severe temperature unevenness can significantly reduce the battery's service life. Furthermore, at very low temperatures, the battery's discharge efficiency is very low, and it may even be difficult to start at low temperatures, affecting its normal operation. Therefore, ensuring the battery's thermal management requirements is crucial.

[0358] In view of this, the present invention provides a technical solution. In this embodiment, a battery cell is arranged in a housing cavity of a battery case, and the battery cell is fixed in the housing cavity. The electrode terminals of the battery cell are arranged toward the bottom wall of the housing cavity. A heat conductor is provided to be thermally connected to the first wall of the battery cell so that the heat conductor is used to conduct heat from the battery cell. Thus, the heat conductor is used to ensure heat conduction in the battery. In this way, the safety of the battery can be effectively improved, and the heat conduction in the battery can be effectively ensured, thereby improving the thermal management performance of the battery. By adjusting the ratio of the distance between the battery electrode terminal and the bottom wall to the weight of the battery cell, the overall structural strength of the battery can be adjusted while maintaining the energy density of the battery, further improving the performance of the battery.

[0359] The technical solutions described in the embodiments of the present application are applicable to various battery-using devices, such as mobile phones, portable devices, laptop computers, electric vehicles, electric toys, electric tools, electric vehicles, ships and spacecraft, etc. For example, spacecraft include airplanes, rockets, space shuttles and spacecraft, etc.

[0360] It should be understood that the technical solutions described in the embodiments of the present application are not limited to the devices described above, but can also be applied to all devices using batteries. However, for the sake of simplicity, the following embodiments are described using electric vehicles as an example.

[0361] For example, as shown in FIG1 , a schematic diagram of the structure of a vehicle 1000 according to one embodiment of the present application is shown. The vehicle 1000 may be a fuel vehicle, a gas vehicle, or a new energy vehicle. The new energy vehicle may be a pure electric vehicle, a hybrid vehicle, or an extended-range vehicle. A motor 101, a controller 102, and a battery 100 may be provided inside the vehicle 1000. The controller 102 is used to control the battery 100 to power the motor 101. For example, the battery 100 may be provided at the bottom, front, or rear of the vehicle 1000. The battery 100 may be used to power the vehicle 1000. For example, the battery 100 may serve as an operating power source for the vehicle 1000 and may be used for the circuit system of the vehicle 1000, such as for the starting, navigation, and operation power requirements of the vehicle 1000. In another embodiment of the present application, the battery 100 may serve not only as an operating power source for the vehicle 1000, but also as a driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0362] To meet different power requirements, the battery 100 may include one or more battery cells 20. For example, Figures 2 and 3 are schematic diagrams of the structure of a battery 100 according to one embodiment of the present application. The battery 100 may include multiple battery cells 20. The battery 100 may also include a housing 10, which has a hollow interior and houses the multiple battery cells 20. For example, the multiple battery cells 20 may be connected in parallel, in series, or in a mixed combination and then placed in the housing 10.

[0363] Optionally, the battery 100 may also include other structures, which will not be described in detail here. For example, the battery 100 may also include a busbar component, which is used to achieve electrical connection between multiple battery cells 20, such as parallel connection, series connection, or mixed connection. Specifically, the busbar component can achieve electrical connection between the battery cells 20 by connecting the electrode terminals of the battery cells 20. Furthermore, the busbar component can be fixed to the electrode terminals of the battery cells 20 by welding. The electrical energy of the multiple battery cells 20 can be further led out through the box through a conductive mechanism. Optionally, the conductive mechanism may also belong to the busbar component.

[0364] Depending on different power requirements, the number of battery cells 20 can be set to any value, for example, there can be one battery cell 20. Multiple battery cells 20 can be connected in series, parallel, or in a hybrid manner to achieve a larger capacity or power. Since each battery 100 may include a large number of battery cells 20, for ease of installation, the battery cells 20 can be grouped, with each group of battery cells 20 forming a battery module. The number of battery cells 20 included in a battery module is not limited and can be set according to requirements. The battery can include multiple battery modules, which can be connected in series, parallel, or in a hybrid manner.

[0365] As shown in FIG4 , a schematic diagram of the structure of a battery cell 20 according to an embodiment of the present application is shown. The battery cell 20 includes one or more electrode assemblies 22, a shell 211, and an end cap 212. The shell 211 and the end cap 212 form the outer shell or battery box 21 of the battery cell 20. The walls of the shell 211 and the end cap 212 are both referred to as the walls of the battery cell 20. For a rectangular battery cell 20, the walls of the shell 211 include a bottom wall and four side walls. The shell 211 is determined according to the shape of the one or more electrode assemblies 22 after being combined. For example, the shell 211 can be a hollow cuboid, cube, or cylinder, and one of the faces of the shell 211 has an opening so that one or more electrode assemblies 22 can be placed in the shell 211. For example, when the shell 211 is a hollow cuboid or cube, one of the planes of the shell 211 is an open surface, that is, the plane has no wall, so that the inside and outside of the shell 211 are connected. When the housing 211 is a hollow cylinder, the end surface of the housing 211 is open, i.e., it lacks a wall, allowing the interior and exterior of the housing 211 to communicate. The end cap 212 covers the opening and is connected to the housing 211 to form a closed cavity for the electrode assembly 22. The housing 211 is filled with an electrolyte, such as an electrolyte solution. The housing 211 can be made of a variety of materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, and plastic, and this embodiment of the present application does not impose any particular limitations on this.

[0366] The battery cell 20 may also include two electrode terminals 214, which may be disposed on the end cap 212. The end cap 212 is typically flat, with the two electrode terminals 214 secured to the flat surface of the end cap 212. The two electrode terminals 214 are respectively a positive electrode terminal 214a and a negative electrode terminal 214b. Each electrode terminal 214 is provided with a corresponding connecting member 23, also known as a current collecting member, located between the end cap 212 and the electrode assembly 22 to electrically connect the electrode assembly 22 and the electrode terminal 214.

[0367] As shown in FIG4 , each electrode assembly 22 has a first electrode tab 221a and a second electrode tab 222a. The polarity of the first electrode tab 221a and the second electrode tab 222a are opposite. For example, when the first electrode tab 221a is a positive electrode tab, the second electrode tab 222a is a negative electrode tab. The first electrode tab 221a of one or more electrode assemblies 22 is connected to one electrode terminal via a connecting member 23, and the second electrode tab 222a of one or more electrode assemblies 22 is connected to another electrode terminal via another connecting member 23. For example, the positive electrode terminal 214a is connected to the positive electrode tab via one connecting member 23, and the negative electrode terminal 214b is connected to the negative electrode tab via another connecting member 23.

[0368] In the battery cell 20 , the electrode assembly 22 can be provided as a single one or multiple ones according to actual use requirements. As shown in FIG. 4 , four independent electrode assemblies 22 are provided in the battery cell 20 .

[0369] The battery cell 20 may also be provided with a pressure relief mechanism 213. The pressure relief mechanism 213 is designed to activate and release the internal pressure or temperature of the battery cell 20 when the internal pressure or temperature reaches a threshold. Specifically, the pressure relief mechanism 213 refers to an element or component that activates to release the internal pressure when the internal pressure of the battery cell 20 reaches a predetermined threshold. That is, when the internal pressure of the battery cell 20 reaches the predetermined threshold, the pressure relief mechanism 212 is activated or brought to a certain state, thereby releasing the internal pressure of the battery cell 20. The action of the pressure relief mechanism 212 may include, but is not limited to, rupturing, breaking, tearing, or opening at least a portion of the pressure relief mechanism 213, thereby forming an opening or channel for releasing the internal pressure. At this point, the high-temperature and high-pressure substances within the battery cell 20 are discharged from the activated portion as exhaust. In this way, the pressure of the battery cell 20 can be released under controllable pressure, thereby avoiding potentially more serious accidents. The pressure relief mechanism 213 may be in the form of an explosion-proof valve, an air valve, a pressure relief valve or a safety valve, and may specifically be a pressure-sensitive element or structure.

[0370] For example, the pressure relief mechanism 213 may be a temperature-sensitive pressure relief mechanism, which is configured to melt when the internal temperature of the battery cell 20 provided with the pressure relief mechanism 213 reaches a threshold value; and / or, the pressure relief mechanism 213 may be a pressure-sensitive pressure relief mechanism, which is configured to rupture when the internal air pressure of the battery cell 20 provided with the pressure relief mechanism 213 reaches a threshold value.

[0371] 10 and 11 are schematic structural diagrams of a battery 100 according to an embodiment of the present application.

[0372] The battery 100 includes a box body 10, a battery cell 20 and a heat conductor 3a. A accommodating cavity 10a is provided in the box body 10. The accommodating cavity 10a includes a top wall 101 and a bottom wall 102 arranged opposite to each other in the vertical direction z. The top wall 101 and the bottom wall 102 are arranged in sequence from top to bottom along the vertical direction. The battery cell 20 is arranged in the accommodating cavity 10a. The battery cell 20 includes an electrode assembly 22 and an electrode terminal 214. The electrode assembly 22 is electrically connected to the electrode terminal 214 so that the battery cell 20 is used to provide electrical energy.

[0373] Among them, the battery cell 20 is fixed to the accommodating cavity 10a, and the electrode terminal 214 is arranged toward the bottom wall 102 of the accommodating cavity 10a, so as to provide a larger electrical connection space for the electrode terminal 214, thereby improving the energy density of the battery 100 and improving the availability and safety of the battery 100.

[0374] Illustratively, the battery cell 20 is fixed to the top of the box body 10 , which can increase the rigidity of the top of the battery 100 and further improve the safety of the battery 100 .

[0375] For ease of description, in the embodiments of the present application, the vertical direction is taken as the up-down direction. It should be understood that when the battery 100 is in use, the vertical direction may also be other directions, which is not specifically limited here.

[0376] Moreover, the battery cell 20 includes a first wall 201, which is the wall with the largest area in the battery cell 20. The first wall 201 can be understood as the "large surface" of the battery cell 20. The heat conductor 3a is arranged in the accommodating cavity 10a, and the heat conductor 3a is used to accommodate the heat exchange medium. The heat conductor 3a is arranged opposite to the first wall 201 of the battery cell 20, and the heat conductor 3a is thermally connected to the first wall 201 of the battery cell 20. The heat exchange medium exchanges heat with the battery cell 20 through the heat conductor 3a to adjust the temperature of the battery cell 20.

[0377] It is understood that a cavity 30a is provided within the heat conducting member 3a. The cavity 30a is used to accommodate a heat exchange medium to regulate the temperature of the battery cell 20. Furthermore, the cavity 30a can reduce the weight of the heat conducting member 3a while maintaining its strength. For example, this can be applied when the heat conducting member 3a is thick. Furthermore, the cavity 30a allows the heat conducting member 3a to have a larger compression space in a direction perpendicular to the first wall 201 (e.g., the first direction x), thereby providing a larger expansion space for the battery cell 20.

[0378] The heat exchange medium can be a liquid or a gas, and regulating the temperature means heating or cooling one or more battery cells 20. In the case of cooling the battery cells 20, the cavity 30a can accommodate a cooling medium to regulate the temperature of one or more battery cells 20. At this time, the heat exchange medium can also be called a cooling medium or a cooling fluid, more specifically, it can be called a coolant or a cooling gas. In addition, the heat exchange medium can also be used for heating, which is not limited in the embodiments of the present application. Optionally, the heat exchange medium can be circulating to achieve a better temperature regulation effect. Optionally, the fluid can be water, a mixture of water and ethylene glycol, thermal oil, refrigerant or air, etc. Optionally, the cooling medium has a higher specific heat capacity to take away more heat, and the boiling point of the cooling medium is lower. When the battery cell 20 is thermally runaway, it can quickly boil and vaporize to absorb heat.

[0379] As can be seen, the large surface of the battery cell 20, i.e., the first wall 201, is thermally connected to the heat conductor 3a, enabling heat exchange between the heat conductor 3a and the battery cell 20 within the accommodating cavity 10a. Furthermore, the heat exchange area between the heat conductor 3a and the battery cell 20 is relatively large, effectively utilizing the heat conductor 3a to conduct heat from the battery cell 20. This improves the heat exchange efficiency between the heat conductor 3a and the battery cell 20, thereby ensuring that the temperature of the battery cell 20 remains normal and improving the service life and safety of the battery cell 20. Furthermore, when the battery 100 includes multiple battery cells 20, if a battery cell 20 experiences thermal runaway, the heat generated by the thermally runaway battery cell 20 will be carried away by the heat conductor 3a with which it is exchanging heat, thereby lowering the temperature of the thermally runaway battery cell 20 and preventing adjacent battery cells 20 from experiencing thermal runaway, thereby ensuring the safety of the battery cell 20. Of course, the battery 100 may also include a single battery cell 20.

[0380] For example, when the temperature of the battery cell 20 is too high, the heat conductive member 3a can cool the battery cell 20 to reduce the temperature of the battery cell 20. When the temperature of the battery cell 20 is too low, the heat conductive member 3a can heat the battery cell 20 to increase the temperature of the battery cell 20.

[0381] Exemplarily, the battery 100 includes multiple battery cells 20, and the multiple battery cells 20 are arranged along the second direction y. That is, the second direction y is the arrangement direction of the multiple battery cells 20 in a column of battery cells 20 in the battery 100. In other words, the battery cells 20 in a column of battery cells 20 in the battery 100 are arranged along the second direction y, and the battery 100 has at least one column of battery cells 20. The number of battery cells 20 in a column of battery cells 20 can range from 2 to 20, but this is not limited in this embodiment of the present application. The thermal conductive member 3a extends along the second direction y and is thermally connected to the first wall 201 of each battery cell 20. Therefore, the first wall 201 of the battery cell 20 can face the thermal conductive member 3a, that is, the first wall 201 of the battery cell 20 can be parallel to the second direction y.

[0382] Optionally, the first wall 201 directly abuts the heat conductor 3a to achieve heat transfer between the battery cell 20 and the heat conductor 3a; or the first wall 201 abuts the heat conductor 3a indirectly, for example, by abutting the first wall 201 against the heat conductor 3a through a heat conductor such as thermal adhesive, which can also achieve heat transfer between the battery cell 20 and the heat conductor 3a. Obviously, the thermal connection between the heat conductor 3a and the first wall 201 means that heat exchange can occur between the first wall 201 and the heat conductor 3a, ensuring the heat conductor 3a's ability to manage the battery cell 20.

[0383] 5 , the battery cell 20 further includes a second wall 202 connected to the first wall 201, and the second wall 202 intersects the first wall 201. The first wall 201 and the second wall 202 are not parallel, and have a common line.

[0384] Optionally, the battery cell 20 is formed into a substantially rectangular parallelepiped structure, and the length of the battery cell 20 is greater than the width and height of the battery cell 20 . The first wall 201 is located on one side of the battery cell 20 in the first direction x, and the battery cell 20 has a second wall 202 on at least one of its two sides in the second direction y. The battery cell 20 has a second wall 202 on at least one of its two sides in the vertical direction z. The electrode terminal 214 may be provided on the second wall 202 of the battery cell 20 in the vertical direction z. Of course, as shown in FIG. 6 , the electrode terminal 214 may also be provided on the second wall 202 of the battery cell 20 in the second direction y. The first direction x, the second direction y, and the vertical direction z are perpendicular to each other.

[0385] Among them, the electrode terminal 214 is arranged on the second wall 202, and the electrode terminal 214 is arranged on the wall of the battery cell 20 other than the first wall 201 and intersecting with the first wall 201, so as to facilitate the arrangement of the electrode terminal 214, and at the same time facilitate the avoidance of the electrode terminal 214 and the heat conductor 3a, so that there is no need to set an avoidance portion on the heat conductor 3a to avoid the electrode terminal 214, which is beneficial to simplify the structure of the heat conductor 3a.

[0386] Optionally, in the example of Figure 6, the battery cell 20 can be a blade battery, the length of the battery cell 20 is greater than the width of the battery cell 20 and the height of the battery cell 20, the length of the battery cell 20 in the second direction y is greater than the width of the battery cell 20 in the vertical direction z and the height of the battery cell 20 in the first direction x, the first wall 201 is located at one end in the height direction of the battery cell 20, and the electrode terminal 214 is provided on the second wall 202, then the electrode terminal 214 can be located at one end or both ends in the length direction of the battery cell 20, and / or the electrode terminal 214 is located at one end or both ends in the width direction of the battery cell 20.

[0387] Of course, in this application, the placement of the electrode terminals 214 is not limited to this. As shown in Figures 7 and 8 , the electrode terminals 214 can also be located on the first wall 201, which also facilitates the placement of the electrode terminals 214; for example, if the battery cell 20 is a One-Stop battery cell. Thus, the battery 100 in this embodiment of the application provides good flexibility in the placement of the electrode terminals 214.

[0388] In some embodiments, as shown in Figure 8, there are multiple battery cells 20, and the multiple battery cells 20 are arranged in a first direction x. In the first direction x, each battery cell 20 is provided with a first surface 203 opposite to the first wall 201, and the first surface 203 is provided with an avoidance groove 203a. The avoidance groove 203a of one of the two adjacent battery cells 20 is used to accommodate the electrode terminal 214 of the other battery cell 20. The first direction x is perpendicular to the first wall 201, so as to facilitate the compact arrangement of the multiple battery cells 20 in the first direction to save space.

[0389] In some embodiments, as shown in Figures 4-6, the electrode terminal 214 is provided on the second wall 202, the battery cell 20 includes two first walls 201 arranged opposite to each other and two second walls 202 arranged opposite to each other, and the electrode terminals 214 are provided in at least two numbers, and the multiple electrode terminals 214 include a positive electrode terminal 214a and a negative electrode terminal 214b.

[0390] Among them, at least two electrode terminals 214 are arranged on the same second wall 202, which is beneficial to saving the occupied space of the battery cell 20 while ensuring that adjacent electrode terminals 214 have appropriate spacing; or, each second wall 202 is provided with at least one electrode terminal 214, so that the electrode terminals 214 located on different second walls 202 have sufficient spacing.

[0391] For example, in the examples of Figures 4 and 5, the battery cell 20 includes two first walls 201 arranged opposite to each other along the first direction x and two second walls 202 arranged opposite to each other along the vertical direction z, and the vertical direction z is not parallel to the first direction x, for example, the vertical direction z is perpendicular to the first direction x; multiple electrode terminals 214 are all located on the same second wall 202 of the battery cell 20 in the vertical direction z.

[0392] In some embodiments, the electrode terminal 214 is disposed on the second wall 202 of the battery cell 20 in the second direction y, or the electrode terminal 214 is disposed on the second wall 202 of the battery cell 20 in the vertical direction z.

[0393] In the example of FIG. 11 , the electrode terminal 214 is provided on the second wall 202 of the battery cell 20 that faces the bottom wall 102 in the vertical direction.

[0394] Of course, for a rectangular battery cell 20, the battery cell 20 may also include two second walls 202 arranged opposite to each other along the second direction y, where the second direction y is not parallel to the first direction, for example, the second direction y is perpendicular to the first direction x; and multiple electrode terminals 214 are all located on the same second wall 202 of the battery cell 20 in the second direction y.

[0395] Regardless of whether the multiple electrode terminals 214 are located on one side of the battery cell 20 in the second direction y or on one side of the battery cell 20 in the vertical direction z, when there are multiple battery cells 20 and the multiple battery cells 20 are arranged in sequence along the second direction y, in the second direction y, the second walls 202 of two adjacent battery cells 20 are opposite.

[0396] It should be noted that, in the present application, the first wall 201 can be a plane or a curved surface, and the second wall 202 can be a plane or a curved surface.

[0397] In some embodiments, as shown in FIG. 9 , the first wall 201 is formed into a cylindrical shape; in this case, the battery cell 20 may be a substantially cylindrical battery cell.

[0398] In some embodiments, as shown in FIG9 , a second wall 202 is provided at both axial ends of the first wall 201, and at least one of the second walls 202 is provided with an electrode terminal 214. Then, all electrode terminals 214 of the battery cell 20 are provided on one of the second walls 202, or at least one electrode terminal 214 of the battery cell 20 is provided on one of the second walls 202, and the remaining electrode terminals 214 of the battery cell 20 are provided on another second wall 202. This facilitates flexible arrangement of the electrode terminals 214.

[0399] In some embodiments, as shown in Figure 9, one of the second walls 202 is provided with an exposed electrode terminal 214, and the electrode assembly 22 includes a positive electrode sheet 221 and a negative electrode sheet 222, one of the positive electrode sheet 221 and the negative electrode sheet 222 is electrically connected to the electrode terminal 214, and the other of the positive electrode sheet 221 and the negative electrode sheet 222 is electrically connected to the first wall 201, so as to achieve normal power supply of the battery cell 20.

[0400] Of course, the other one of the positive electrode sheet 221 and the negative electrode sheet 222 can also be electrically connected to the other second wall 202, that is, the second wall 202 provided with the exposed electrode terminal 214 is not the same wall as the second wall 202 electrically connected to the other one of the positive electrode sheet 221 and the negative electrode sheet 222, which also facilitates the normal power supply of the battery cell 20.

[0401] In some embodiments, at least one battery cell 20 is a soft-pack battery cell. Thus, when the battery 100 includes one battery cell 20, the battery cell 20 is a soft-pack battery cell. When the battery 100 includes multiple battery cells 20, at least one of the multiple battery cells 20 is a soft-pack battery cell. This facilitates a variety of battery types, structures, and battery cell 20 layouts, thereby enabling the battery 100 to meet actual differentiated needs.

[0402] In some embodiments, as shown in Figures 4 and 5, the battery cell 20 further includes a pressure relief mechanism 213, and the pressure relief mechanism 213 and the electrode terminal 214 are arranged on the same wall of the battery cell 20. For example, the pressure relief mechanism 213 and the electrode terminal 214 are both arranged on the second wall 202, and for another example, the pressure relief mechanism 213 and the electrode terminal 214 are both arranged on the first wall 201.

[0403] Of course, in other embodiments of the present application, the battery cell 20 further includes a pressure relief mechanism 213 , and the pressure relief mechanism 213 and the electrode terminal 214 are respectively arranged on two walls of the battery cell 20 , for example, the electrode terminal 214 is arranged on the first wall 201 , and the pressure relief mechanism 213 is arranged on the second wall 202 .

[0404] Therefore, the position of the pressure relief mechanism 213 relative to the electrode terminal 214 has a certain degree of flexibility.

[0405] In some embodiments, the thermal conductor 3a is fixedly connected to the first wall 201 to connect the thermal conductor 3a to the battery cell 20 and ensure a reliable connection between the battery cell 20 and the thermal conductor 3a. Furthermore, when there are at least two battery cells 20 and the thermal conductor 3a is connected to the first walls 201 of at least two battery cells 20, the thermal conductor 3a can be used to connect the at least two battery cells 20 into a whole. In this case, the battery 100 does not need to have side panels or other structures such as beams, which can greatly improve the space utilization within the battery 100 and increase the energy density of the battery 100. In this case, the thermal conductor 3a can also be called a reinforcement.

[0406] Of course, the heat conducting member 3 a may also be fixedly connected to other walls of the battery cell 20 , and is not limited to the first wall 201 .

[0407] In some embodiments, the thermal conductor 3a is bonded to the first wall 201 through a first adhesive layer, so that the thermal conductor 3a is bonded to the first wall 201 to achieve a reliable and stable connection between the thermal conductor 3a and the battery cell 20, so as to ensure that the battery 100 as a whole has a certain rigidity and strength. At the same time, it reduces consumables and overall weight, which is conducive to the lightweight design of the battery 100, and the structure is simple, making the structure more compact and easy to process and assemble.

[0408] Optionally, the first adhesive layer may include a heat-conducting structural adhesive, which not only has good bonding strength and peel strength, but also has thermal conductivity, aging resistance, fatigue resistance, and corrosion resistance. This can improve the connection strength and thermal management efficiency between the battery cell 20 and the heat-conducting member 3a, thereby accelerating heat transfer between the battery cell 20 and the heat-conducting member 3a. Of course, the first adhesive layer also includes double-sided tape, etc.

[0409] It should be understood that the heat conducting member 3 a and the first wall 201 may also be connected by other means, such as riveting, welding, etc., which is not limited in this application.

[0410] Optionally, the heat conducting member 3 a may also be clamped between the battery cells 20 in adjacent columns by abutting against the first wall 201 .

[0411] In some embodiments, the bottom of the heat conductor 3a is bonded to the bottom wall 102 of the accommodating cavity 10a through a second adhesive layer, so that the bottom of the heat conductor 3a is bonded to the bottom wall 102 of the accommodating cavity 10a to achieve a fixed connection between the heat conductor 3a and the bottom wall 102 of the accommodating cavity 10a. The structure is simple and easy to process and assemble. At this time, the heat conductor 3a is respectively bonded and fixed to the first wall 201 and the bottom 02 wall of the accommodating cavity 10a to ensure the reliable setting of the heat conductor 3a.

[0412] In some embodiments, the bottom of the battery cell 20 is bonded to the bottom wall 102 of the accommodating cavity 10a through a third adhesive layer, so that the bottom of the battery cell 20 is bonded to the bottom wall 102 of the accommodating cavity 10a, thereby achieving a fixed connection between the battery cell 20 and the bottom wall 102 of the accommodating cavity 10a. The structure is simple and easy to process and assemble. At this time, the heat conductor 3a is bonded and fixed to the first wall 201, and the battery cell 20 is bonded and fixed to the bottom wall 102 of the accommodating cavity 10a, then the heat conductor 3a is indirectly fixed to the bottom wall 102 of the accommodating cavity 10a through the battery cell 20.

[0413] In some embodiments, the bottom of the heat conductor 3a is bonded to the bottom wall 02 of the accommodating cavity 10a via a second adhesive layer, and the bottom of the battery cell 20 is bonded to the bottom wall 102 of the accommodating cavity 10a via a third adhesive layer.

[0414] In some embodiments, at least part of the heat of the battery cell 20 can be transferred to the thermal conductor 3a through the first adhesive layer, and the thickness of the first adhesive layer is less than or equal to the thickness of the second adhesive layer. This is beneficial to reducing the heat transfer resistance between the battery cell 20 and the thermal conductor 3a, and ensuring the heat transfer efficiency between the battery cell 20 and the thermal conductor 3a, while ensuring that the battery cell 20 is reliably connected to the thermal conductor 3a and the thermal conductor 3a is reliably connected to the bottom wall 102 of the accommodating cavity 10a.

[0415] In some embodiments, the thickness of the first adhesive layer is less than or equal to the thickness of the third adhesive layer, so as to reduce the heat transfer resistance between the battery cell 20 and the heat conductor 3a while ensuring that the battery cell 20 is reliably connected to the heat conductor 3a and the bottom wall 102 of the accommodating cavity 10a, thereby ensuring the heat transfer efficiency between the battery cell 20 and the heat conductor 3a.

[0416] In some embodiments, the thickness of the first glue layer is less than or equal to the thickness of the second glue layer, and the thickness of the first glue layer is less than or equal to the thickness of the third glue layer. Then, the thickness of the first glue layer, the thickness of the second glue layer, and the thickness of the third glue layer are reasonably set to ensure the reasonable distribution and utilization of the glue, and realize the reliable arrangement of the battery cell 20 and the heat conductor 3a in the accommodating cavity 10a.

[0417] In some embodiments, the thermal conductivity of the first adhesive layer is greater than or equal to the thermal conductivity of the second adhesive layer, and at least part of the heat of the battery cell 20 can be transferred to the thermal conductive member 3a through the first adhesive layer. This is beneficial to reducing the heat transfer resistance between the battery cell 20 and the thermal conductive member 3a, and ensuring the heat transfer efficiency between the battery cell 20 and the thermal conductive member 3a, while ensuring a reliable connection between the battery cell 20 and the thermal conductive member 3a, and a reliable connection between the thermal conductive member 3a and the bottom wall 102 of the accommodating cavity 10a.

[0418] In some embodiments, the thermal conductivity of the first adhesive layer is greater than or equal to the thermal conductivity of the third adhesive layer, so as to reduce the heat transfer resistance between the battery cell 20 and the thermal conductive member 3a and ensure the heat transfer efficiency between the battery cell 20 and the thermal conductive member 3a while ensuring that the battery cell 20 is reliably connected to the thermal conductive member 3a and the bottom wall 102 of the accommodating cavity 10a respectively.

[0419] Of course, part of the heat of the battery cell 20 can also be transferred to the bottom wall 102 of the accommodating cavity 10 a through the third adhesive layer for dissipation.

[0420] In some embodiments, the thermal conductivity of the first adhesive layer is greater than or equal to the thermal conductivity of the second adhesive layer, and the thermal conductivity of the first adhesive layer is greater than or equal to the thermal conductivity of the second adhesive layer, so as to achieve reasonable distribution and utilization of the adhesive, ensure the stable arrangement of the battery cell 20 and the heat conducting member 3a, and ensure the rapid dissipation of heat from the battery cell 20.

[0421] In some embodiments, the ratio of the thickness of the first adhesive layer to the thermal conductivity of the first adhesive layer is a first ratio, the ratio of the thickness of the second adhesive layer to the thermal conductivity of the second adhesive layer is a second ratio, and the ratio of the thickness of the third adhesive layer to the thermal conductivity of the third adhesive layer is a third ratio.

[0422] The first ratio is less than or equal to the second ratio; and / or the first ratio is less than or equal to the third ratio. Thus, under the premise of ensuring the heat exchange effect of the battery cell 20, the colloid is effectively and reasonably utilized, and the colloid is reasonably distributed.

[0423] In some embodiments, the material of the first adhesive layer is different from the material of the second adhesive layer; or the material of the first adhesive layer is different from the material of the third adhesive layer; or the material of the first adhesive layer is different from the material of the second adhesive layer and the material of the third adhesive layer.

[0424] In some embodiments, a battery 100 includes multiple battery modules 100a. Each battery module 100a includes at least one column of battery packs 20A and at least one thermally conductive member 3a. The battery pack 20A includes a column of multiple battery cells 20 arranged along a second direction y. The first wall 201 of each battery cell 20 in the battery pack 20A is fixed to and thermally connected to the thermally conductive member 3a. Multiple battery packs 20A and multiple thermally conductive members 3a may be provided. The multiple battery packs 20A and the multiple thermally conductive members 3a are alternately arranged along a first direction x, which is perpendicular to the first wall 201.

[0425] Optionally, the battery module 100a includes N battery packs 20A and N-1 thermally conductive members 3a. The thermally conductive members 3a are disposed between two adjacent battery packs 20A, where N is an integer greater than 1. For example, when N is 2, the battery modules 100a are arranged along the first direction x, with gaps between adjacent battery modules 100a. Alternatively, the thermally conductive members 3a may be disposed between the battery packs 20A and the inner wall of the housing 10.

[0426] In some embodiments, a column of battery cells 20 arranged along the second direction y may be connected to the heat conductor 3a on only one side in the first direction x, or on both sides in the first direction x. This embodiment of the present application does not limit this.

[0427] In some embodiments, the heat conductor 3a is used to exchange heat with the battery cell 20 to ensure that the battery cell 20 has a suitable temperature. At this time, the heat conductor 3a can also be called a thermal management component 3b, which is also used to exchange heat with the battery cell 20 to ensure that the battery cell 20 has a suitable temperature.

[0428] In some embodiments, the heat conductor 3a includes metal materials and / or non-metallic materials, so that the heat conductor 3a has flexible material selection settings, so that the heat conductor 3a can have other good properties in addition to good thermal conductivity, so as to better meet actual differentiated needs.

[0429] In some embodiments, as shown in Figures 10-13 , the thermal conductor 3a includes a metal plate 31 and an insulating layer 32, with the insulating layer 32 disposed on the surface of the metal plate 31. With this arrangement, the metal plate 31 can ensure the strength of the thermal conductor 3a, and the insulating layer 32 can insulate the surface of the thermal conductor 3a that connects to the first wall 201, thereby preventing electrical connection between the metal plate 31 and the battery cell 20 and ensuring electrical insulation within the battery 100.

[0430] Optionally, the insulating layer 32 may be an insulating film adhered to the surface of the metal plate 31 or an insulating varnish coated on the surface of the metal plate 31 .

[0431] In some embodiments, the heat conducting member 3a is a non-metallic material plate; that is, the heat conducting member 3a is entirely made of a non-metallic insulating material. Of course, in other embodiments, a portion of the heat conducting member 3a is made of a non-metallic material.

[0432] In some embodiments, as shown in Figures 14, 15 and 30, there are multiple battery cells 20, and the multiple battery cells 20 are arranged along the second direction y; the thermal conductor 3a includes a partition 33, the partition 33 extends along the second direction y, and the partition 33 is connected to the first wall 201 of each battery cell 20 in the multiple battery cells 20, and the second direction y is parallel to the first wall 201.

[0433] Thus, the first wall 201 with the largest surface area of ​​each battery cell 20 in the multiple battery cells 20 is connected to the partition 33, and the multiple battery cells 20 are connected into a whole through the partition 33. Then, there is no need to set side panels in the battery 100, and there is no need to set structures such as beams. The space utilization inside the battery 100 can be greatly improved, and the energy density of the battery 100 can be improved.

[0434] As batteries are used, the blue film on the surface of battery cells is easily damaged. If the blue film is damaged, insulation failure occurs between adjacent battery cells and between the battery cells and the casing, increasing the risk of battery short circuits. Furthermore, to regulate the temperature of the battery cells, water cooling plates or heating plates are installed between adjacent battery cells. Since the surfaces of these plates are not insulated, water vapor inside the battery cells easily liquefies on the surfaces of these plates. If the blue film is damaged, the risk of battery short circuits is further increased.

[0435] Based on the above considerations, in order to alleviate the problem of battery short circuit caused by blue film damage, the inventors conducted in-depth research and set the heat conductive member 3a to also include an insulating layer 32, which is used to insulate and isolate the first wall 201 of the battery cell 20 and the partition 33.

[0436] The insulating layer 32 is arranged on the surface of the partition 33 and is not easily damaged by the expansion of the battery cell or self-heating. When there is no insulating structure on the surface of the battery cell or the blue film on the surface of the battery cell is damaged, when the water vapor inside the battery cell liquefies on the surface of the partition, the insulating layer 32 arranged on the surface of the partition 33 can play an insulating role between the battery cell 20 and the partition 33, which is beneficial to alleviate the problem of short circuit of the battery 100 due to damage to the blue film of the battery cell 20 or liquefaction of water vapor on the surface of the partition 33, reduce the risk of short circuit of the battery 100, and improve the power safety of electrical devices.

[0437] The insulating layer 32 is connected to the surface of the partition 33 , so that the insulating layer 32 can cover part of or the entire surface of the partition 33 .

[0438] In some embodiments, the partition 33 is used for heat exchange with the battery cell 20. In this case, the partition 33 can also be called a thermal management component. The thermal management component is a structure that exchanges heat with the battery cell 20, such as a heating resistor, a heat conductor with a heat exchange medium, and some materials that can undergo chemical reactions to produce temperature changes according to changes in the environment. Heat exchange with the battery cell 20 is achieved through the temperature change of the thermal management component itself. In this case, if the temperature of the thermal management component is lower than the temperature of the battery cell 20, the thermal management component can cool the battery cell 20 to prevent the battery cell 20 from being overheated and causing thermal runaway; if the temperature of the thermal management component is higher than the temperature of the battery cell 20, the thermal management component can heat the battery cell 20 to ensure that the battery 100 can operate normally.

[0439] The thermal management component can also be a structure capable of accommodating a fluid medium, and heat is transferred between the battery cell 20 and the fluid medium through the thermal management component and the insulating layer 32, thereby achieving heat exchange between the battery cell 20 and the fluid medium. The fluid medium can be a liquid (e.g., water) or a gas (e.g., air). In this case, if the temperature of the fluid medium contained within the thermal management component is lower than the temperature of the battery cell 20, the thermal management component can cool the battery cell 20 to prevent the battery cell 20 from overheating and causing thermal runaway; if the temperature of the fluid medium contained within the thermal management component is higher than the temperature of the battery cell 20, the thermal management component can heat the battery cell 20 to ensure that the battery 100 can operate normally.

[0440] Optionally, the partition 33 may be disposed on one side of the battery cell 20 and between the battery cell 20 and the box body 10 , or may be disposed between two adjacent battery cells 20 .

[0441] In some embodiments, the insulating layer 32 may only insulate the battery cells 20 and the separator 33. In other embodiments, the insulating layer 32 may insulate both the battery cells 20 and the separator 33, and also insulate the separator 33 and the inner wall of the casing 10, further reducing the risk of short circuiting the battery 100 and thereby further improving the safety of the battery 100.

[0442] For example, multiple battery cells 20 are stacked along a first direction x, and a partition 33 can be set between two adjacent battery cells 20. Insulation layers 32 are respectively provided on opposite sides of the partition 33, so that each battery cell 20 in the two adjacent battery cells 20 is insulated and isolated from the partition 33 by the insulation layer 32.

[0443] For another example, along the stacking direction of the multiple battery cells 20, a partition 33 can also be set between the two battery cells 20 located at the end and the inner wall of the box body 10, and the insulating layer 32 connected to the partition 33 can only insulate and isolate the battery cells 20 and the partition 33; of course, the insulating layer 32 connected to the partition 33 can both insulate and isolate the battery cells 20 and the partition 33, and also insulate and isolate the partition 33 and the inner wall of the box body 10, further reducing the risk of short circuit of the battery 100, thereby further improving the safety of the battery 100.

[0444] In some embodiments, the thermal conductivity λ of the insulating layer 32 is greater than or equal to 0.1W / (m·K), and the insulating layer 32 has good thermal conductivity, so that the insulating layer 32 can play a role in transferring heat, so that there is good thermal conductivity between the battery cell 20 and the partition 33, thereby improving the heat exchange efficiency between the battery cell 20 and the partition 33; for example, when the partition 33 is a thermal management component 3b, it is convenient to effectively ensure that the battery cell 20 has a suitable temperature.

[0445] Thermal conductivity refers to the amount of heat transferred through an area of ​​1 square meter in 1 hour when the temperature difference between the two surfaces of a 1 meter thick material is 1 degree (K, ℃) under stable heat transfer conditions. The unit is watt / meter·degree (W / (m·K) where K can be replaced by ℃).

[0446] In some embodiments, the density G of the insulating layer 32 is less than or equal to 1.5 g / cm 3 .

[0447] The insulating layer 32 is provided on the surface of the separator 33, which increases the weight of the battery 100. The smaller the density of the insulating layer 32, the smaller the mass of the insulating layer 32. The larger the density of the insulating layer 32, the larger the mass of the insulating layer 32. The density G of the insulating layer 32 is ≤ 1.5 g / cm 3 , which makes the weight of the insulating layer 32 smaller, thereby making the weight of the battery 100 smaller, reducing the impact of the setting of the insulating layer 32 on the weight of the battery 100, and is conducive to lightweighting the battery 100.

[0448] In some embodiments, the compressive strength P of the insulating layer 32 satisfies 0.01Mpa≤P≤200Mpa, so that the insulating layer 32 has a certain elasticity, and the insulating layer 32 can reduce the impact on the battery 100 as a whole through its own deformation when the battery cell 20 expands and deforms. Alternatively, the elastic insulating layer 32 can also act as a buffer through its own deformation when the battery 100 is subjected to an impact, thereby providing a certain degree of protection for the battery cell 20 and improving the safety of the battery 100.

[0449] Compressive strength refers to the maximum compressive stress that a specimen can withstand until it breaks or yields during a compression test.

[0450] There are many options for the material of the insulating layer 32 . For example, in some embodiments, the material of the insulating layer 32 includes at least one of polyethylene terephthalate, polyimide, and polycarbonate.

[0451] The material of the insulating layer 32 may include only one of polyethylene terephthalate, polyimide, and polycarbonate. In other embodiments, the material of the insulating layer 32 may include two or three of polyethylene terephthalate, polyimide, and polycarbonate. For example, the insulating layer 32 includes a first insulating portion and a second insulating portion stacked together, the material of the first insulating portion is polyethylene terephthalate, and the material of the second insulating portion is polyimide, or the material of the first insulating portion is polyimide, and the material of the second insulating portion is polycarbonate, or the material of the first insulating portion is polyethylene terephthalate, and the material of the second insulating portion is polycarbonate. In still other embodiments, the insulating layer 32 includes a first insulating portion, a second insulating portion, and a third insulating portion stacked together, the material of the first insulating portion is polyethylene terephthalate, the material of the second insulating portion is polyimide, and the material of the third insulating portion is polycarbonate.

[0452] Polyethylene terephthalate, polyimide, and polycarbonate have advantages such as good impact strength and good heat aging resistance. Therefore, the material of the insulating layer 32 includes at least one of polyethylene terephthalate, polyimide, and polycarbonate, and the insulating layer 32 has advantages such as good impact strength and good heat aging resistance. In addition, the thermal conductivity of polyethylene terephthalate is generally 0.24W / m·K, the thermal conductivity of polyimide is generally 0.1-0.5W / m·K, and the thermal conductivity of polycarbonate is generally 0.16-0.25W / m·K. Therefore, all three materials have good thermal conductivity. If at least one of the three materials is used to form the insulating layer 32, the insulating layer 32 has good thermal conductivity, thereby improving the heat exchange performance and heat exchange efficiency between the battery cell 20 and the separator 33.

[0453] There are many ways to connect the insulating layer 32 to the separator 33. For example, in some embodiments, the insulating layer 32 is a coating applied to the surface of the separator 33. That is, the insulating layer 32 is connected to the separator 33 by coating. In this case, the insulating layer 32 may or may not be connected to the battery cell 20. The insulating layer 32 is a coating applied to the surface of the separator 33, which can make the insulating layer 32 and the separator 33 fit more tightly, thereby improving the connection stability between the insulating layer 32 and the separator 33 and reducing the risk of the insulating layer 32 falling off the separator 33.

[0454] For example, in some other embodiments, the insulating layer 32 and the separator 33 are connected via an adhesive layer. The adhesive layer can be a glue layer disposed on the insulating layer 32 and / or the separator 33. After the adhesive layer bonds the separator 33 and the insulating layer 32, the adhesive layer is located between the separator 33 and the insulating layer 32. In this case, the insulating layer 32 may be connected to the battery cell 20 via another adhesive layer, or it may not be connected to the battery cell 20. Connecting the insulating layer 32 and the separator 33 via an adhesive layer is a simple and convenient connection method.

[0455] For example, in some other embodiments, the insulating layer 32 is potted between the separator 33 and the battery cell 20. Potting is the process of mechanically or manually pouring a liquid composite into the device, which then solidifies at room temperature or under heating conditions to form a high-performance thermosetting polymer insulating material. Potting the insulating layer 32 between the separator 33 and the battery cell 20 strengthens the overall structure formed by the battery cell 20, the insulating layer 32, and the separator 33, improving its resistance to external shock and vibration.

[0456] In some embodiments, as shown in FIG14 , a dimension T1 of the separator 33 in the first direction x is less than 0.5 mm, and the first direction x is perpendicular to the first wall 201. This prevents the separator 33 from being too large in the first direction x and occupying too much space within the battery 100, further improving space utilization within the battery 100 and thereby increasing the energy density of the battery 100.

[0457] In some embodiments, in the vertical direction, the partition 33 has a first part, a second part and a third part arranged in sequence, the distance between the first part and the top wall of the battery cell 20 does not exceed 1 / 4 of the height of the battery cell 20 in the vertical direction, the distance between the third part and the top wall of the battery cell 20 does not exceed 1 / 4 of the height of the battery cell 20 in the vertical direction, and the size of the third part in the first direction x is T1.

[0458] In some embodiments, the dimension T1 of the separator 33 in the first direction x is not less than 0.05 mm. This can prevent the separator 33 from being too small in the first direction x, i.e., the separator 33 is too thin and the rigidity of the separator 33 is too low to meet the strength requirements of the battery 100.

[0459] In some embodiments, as shown in FIG14( c ), an insulating layer 32 is provided on the surface of the separator 33 to prevent electrical connection between the separator 33 and the battery cell 20, thereby improving the safety of the battery 100. Alternatively, the insulating layer 32 may be an insulating film adhered to the surface of the separator 33 or an insulating varnish coated on the surface of the separator 33.

[0460] In some embodiments, a dimension T2 of the insulating layer 32 in the first direction x satisfies: 0.01 mm≤T2≤0.3 mm.

[0461] When the dimension T2 of the insulating layer 32 in the first direction x is too small, the insulating layer 32 cannot effectively prevent the electrical connection between the battery cell 20 and the partition 33, and the battery 100 will have poor insulation, posing a safety hazard. When the dimension T2 of the insulating layer 22 in the first direction x is too large, it will occupy too much space inside the battery 100, which is not conducive to improving the energy density of the battery 100. Therefore, the value of T2 is set to 0.01mm~0.3mm, which can not only improve the energy density of the battery 100, but also ensure the safety of the battery 100.

[0462] In the embodiment of the present application, the voltage E of the battery 100 and the dimension T2 of the insulating layer 32 in the first direction x satisfy the following conditions: 0.01×10 -3 mm / V≤T2 / E≤3×10 -3 mm / V.

[0463] The insulation effect of the insulating layer 32 is not only related to the thickness of the insulating layer 32, but also to the thickness of the insulating layer 32 corresponding to the unit voltage. When T2 / E is too small, that is, the dimension T2 of the insulating layer 32 per unit voltage in the first direction x is too small, the insulating layer 32 cannot effectively prevent the electrical connection between the battery cell 20 and the separator 33, and the battery 100 will have poor insulation, posing a safety hazard. When T2 / E is too large, that is, the dimension T2 of the insulating layer 32 per unit voltage in the first direction x is too large, too much space inside the battery 100 will be occupied, which is not conducive to improving the energy density of the battery 100. Therefore, the value of T2 / E is set to 0.01×10 -3 ~3×10 -3 mm / V, which can not only improve the energy density of the battery 100, but also ensure the safety of the battery 100.

[0464] In some embodiments, the area S1 of the surface of the separator 33 connected to the first walls 201 of the plurality of battery cells 20 and the total area S2 of the first walls 201 of the plurality of battery cells 20 connected to the same side of the separator 33 satisfy the following: 0.25 ≤ S1 / S2 ≤ 4, where S1 = H1*L1 and S2 = H2*L2. As shown in Figure 15, H1 is the dimension of the separator 33 in the third direction, L1 is the dimension of the separator 33 in the second direction y, H2 is the dimension of a single battery cell 20 in the third direction, and L2 is the sum of the dimensions of the plurality of battery cells 20 in the second direction y. The third direction in this application may be the vertical direction z.

[0465] When the value of S1 / S2 is too small, that is, the area S1 of the surface of the partition 33 connected to the first walls 201 of the multiple battery cells 20 is much smaller than the total area S2 of the first walls 201 of the multiple battery cells 20 connected to the same side of the partition 33, the contact area between the first wall 201 and the partition 33 is too small to meet the strength requirements of the battery 100; when the value of S1 / S2 is too large, that is, the area S1 of the surface of the partition 33 connected to the first wall 201 is much larger than the total area S2 of the first walls 201 of the multiple battery cells 20 connected to the same side of the partition 33, compared with the battery cells 20, the partition 33 occupies too much space inside the battery 100, which is not conducive to improving the energy density of the battery 100; therefore, setting the value of S1 / S2 to 0.25-4 can not only improve the energy density of the battery 100, but also enhance the strength of the battery 100.

[0466] In some embodiments, as shown in FIG. 15 , in the third direction, the dimension H1 of the separator 33 and the dimension H2 of the first wall 201 of the battery cell 20 satisfy: 0.2≤H1 / H2≤2. The third direction is perpendicular to the first direction x and the second direction y.

[0467] When H1 / H2 is too small, that is, in the third direction, the size H1 of the partition 33 is much smaller than the size H2 of the first wall 201 of the battery cell 20, the contact area between the first wall 201 and the partition 33 is too small to meet the strength requirements of the battery 100; when H1 / H2 is too large, that is, in the third direction, the size H1 of the partition 33 is much larger than the size H2 of the first wall 201 of the battery cell 20, compared with the battery cell 20, the partition 33 occupies too much space inside the battery 100, which is not conducive to improving the energy density of the battery 100. Therefore, setting the value of H1 / H2 to 0.2-2 can improve both the energy density and the strength of the battery 100.

[0468] In some embodiments, as shown in FIG. 15 , in the second direction y, a size L1 of the separator 33 and a size L2 of the plurality of battery cells 20 satisfy: 0.5≤L1 / L2≤2.

[0469] When L1 / L2 is too small, that is, in the second direction y, the size L1 of the partition 33 is much smaller than the size L2 of the first wall 201 of the battery cell 20, the contact area between the first wall 201 and the partition 33 is too small to meet the strength requirements of the battery 100; when H1 / H2 is too large, that is, in the second direction y, the size H1 of the partition 33 is much larger than the size L2 of the first wall 201 of the battery cell 20, compared with the battery cell 20, the partition 33 occupies too much space inside the battery 100, which is not conducive to improving the energy density of the battery 100. Therefore, setting the value of L1 / L2 to 0.5~2 can not only improve the energy density of the battery 100, but also improve the strength of the battery 100.

[0470] Optionally, a fixing structure 103 is provided at the end of the partition 33 in the second direction y. The fixing structure 103 is connected to a fixing member 104 at the end of the partition 33 in the second direction y to fix the partition 33 .

[0471] Using the battery cell 20 and separator 33 shown in FIG14 , a vibration and impact test of the separator was conducted in accordance with the GB38031-2020 "Safety Requirements for Power Batteries for Electric Vehicles" standard. The test results are shown in Table 1. In Table 1, T1 represents the separator dimension in the first direction x, H1 represents the separator dimension in the third direction, L1 represents the separator dimension in the second direction y, H2 represents the dimension of a single battery cell in the third direction, L2 represents the sum of the dimensions of multiple battery cells in the second direction y, S1 = H1 * L1, and S2 = H2 * L2.

[0472] Table 1

[0473] T1(mm)H2(mm)L2(mm)L1(mm)H1(mm)S1 / S2L1 / L2H1 / H2Vibration impact test results0.13040080060422No cracking, no fire or explosion0.530400200150.250.51No cracking, no fire or explosion0.48011481148400.510.4No cracking, no fire or explosion0.4801148574800.50.50.8No cracking, no fire or explosion0.2112116412241000.9410.19No cracking, no fire or explosion0.4127 348278.463.50.40.80.5No cracking, no fire or explosion0.412734817463.50.250.50.8No cracking, no fire or explosion0.32055225821931.051.110.27No cracking, no fire or explosion0.5205522417.6102.50.40.800.625No cracking, no fire or explosion0.11127768361000.961.080.09No cracking, no fire or explosion0.5112116412241000.941050.48No cracking, no fire or explosion

[0474] Using the battery cell 20 and separator 33 shown in Figures 14 and 15 , the separator's insulation withstand voltage capability was tested in accordance with IEC 60664-1 under the following conditions: an insulation test with an applied voltage of 1000 VDC and an insulation resistance of ≥ 500 MΩ; and a withstand voltage test with an applied voltage of 2700 VDC for 60 seconds and a leakage current of ≤ 1 mA. The test results are shown in Table 2. In Table 2, T2 is the dimension of the insulation layer in the first direction x, and E is the battery voltage.

[0475] Table 2

[0476] T2(mm)U(V)T2 / U(10 -3 mm / V) Insulation withstand voltage test results 0.01100000.01 Insulation withstand voltage meets the requirements 0.310000.3 Insulation withstand voltage meets the requirements 0.31003 Insulation withstand voltage meets the requirements 0.154000.38 Insulation withstand voltage meets the requirements 0.158000.19 Insulation withstand voltage meets the requirements 0.33001 Insulation withstand voltage meets the requirements 0.32001.5 Insulation withstand voltage meets the requirements 0.2800.25 Insulation withstand voltage meets the requirements 0.23500.57 Insulation withstand voltage meets the requirements

[0477] In some embodiments, as shown in FIG. 30 and FIG. 31 , a dimension T1 of the partition 33 in the first direction x is greater than 5 mm, and the first direction is perpendicular to the first wall 201 , so as to ensure that the partition 33 has good reliability in use.

[0478] For example, as shown in FIG. 30 , the battery 10 includes a plurality of battery cells 20 arranged along the second direction Y and a separator 33 extending along the second direction Y and connected to the first wall 201 of each of the plurality of battery cells 20 .

[0479] In some embodiments, a dimension T1 of the partition in the first direction x is no greater than 100 mm.

[0480] When the dimension T1 of the partition in the first direction x is too large, it will occupy too much space inside the battery 100, which is not conducive to improving the energy density of the battery 100. Therefore, setting the value of T1 to no more than 100 mm can effectively improve the energy density of the battery 100.

[0481] In some embodiments, as shown in FIG. 31 , a dimension T1 of the separator 33 in the first direction x and a dimension T3 of the battery cell 20 in the first direction x satisfy: 0.04≤T1 / T3≤2.

[0482] When T1 / T3 is too small, that is, the dimension T1 of the partition 33 in the first direction x is much smaller than the dimension T3 of the battery cell 20 in the first direction x, the partition 33 has a weak ability to absorb deformation and cannot match the expansion deformation of the battery cell 20, which will reduce the performance of the battery cell 20. When T1 / T3 is too large, that is, the dimension T1 of the partition 33 in the first direction x is much larger than the dimension T3 of the battery cell 20 in the first direction x, the partition 33 has an excessive ability to absorb deformation, far exceeding the expansion and deformation space required by the battery cell 20. Compared with the battery cell 20, the partition 33 occupies too much space inside the battery 10, which is not conducive to improving the energy density of the battery 10. Therefore, the value of T1 / T3 is set to 0.04~2, which can both improve the energy density of the battery 10 and absorb the expansion deformation of the battery cell 20.

[0483] In some embodiments, an insulating layer 32 is provided on the outer surface of the partition 33 , and a dimension T2 of the insulating layer 32 along the first direction x is 0.01 mm to 0.3 mm.

[0484] By providing an insulating layer 32 on the outer surface of the partition 33, electrical connection between the battery cell 20 and the partition 33 is avoided, thereby improving the safety of the battery 10. When the dimension T2 of the insulating layer 31 in the first direction x is too small, the insulating layer 32 cannot effectively avoid electrical connection between the battery cell 20 and the partition 33, and the battery 100 will have poor insulation. When the dimension T2 of the insulating layer 32 in the first direction x is too large, it will occupy too much space inside the battery 100, which is not conducive to improving the energy density of the battery 100. Therefore, the value of T2 is set to 0.01mm~0.3mm, which can not only improve the energy density of the battery 100, but also ensure effective insulation between the battery cell 20 and the partition 33.

[0485] Optionally, a current collecting element 106 is provided at the end of the separator 33 in the second direction y, and a pipe 107 is provided inside the battery 100. The pipe 107 is used to transport fluid, and the current collecting element 106 is used to collect the fluid. For example, the connecting pipe group 42 described below can include the pipe 107.

[0486] Using the battery cell 20 and separator 3333 shown in Figures 30-34 , an accelerated cycling endurance test was conducted at 60°C with a 1C / 1C charge-discharge cycle until the capacity decayed to 80% SOC. The test results are shown in Table 3. In Table 3, T1 is the dimension of the separator in the first direction x, and T3 is the dimension of the battery cell in the first direction x.

[0487] Table 3

[0488] T3(mm)T1(mm)T1 / T3 cyclic durability accelerated test results1255.10.041The structure is not damaged, and there is no diving26.560.226The structure is not damaged, and there is no diving12.5252.000The structure is not damaged, and there is no diving47.45.10.108The structure is not damaged, and there is no diving44200.455The structure is not damaged, and there is no diving44601.364The structure is not damaged, and there is no diving70.7700.990The structure is not damaged, and there is no diving10151.500The structure is not damaged, and there is no diving44300.682The structure is not damaged, and there is no diving10.7260.085The structure is not damaged, and there is no diving1060.6The structure is not damaged, and there is no diving

[0489] In some embodiments, as shown in Figures 10 to 13, since the heat conductor 3a is fixedly connected to the first wall 201 of one or more battery cells 20, in order to ensure the performance of the battery 100, the heat conductor 3a must take into account the strength requirements. The size of the heat conductor 3a in the first direction x is set to 0.1 to 100 mm, and the first direction is perpendicular to the first wall 201, so as to take into account both strength and space requirements.

[0490] Specifically, the dimension T5 of the thermal conductor 3a in the first direction, i.e., its thickness, is larger. A smaller T5 reduces its footprint. When T5 is less than 0.1 mm, the thermal conductor 3a is easily damaged by external forces. When T5 is greater than 100 mm, it takes up too much space, affecting energy density. Therefore, a dimension T5 of the thermal conductor 3a in the first direction x of 0.1 to 100 mm can improve space utilization while maintaining strength.

[0491] In some embodiments, a thermally conductive member 3a is provided in the battery 100 and thermally connected to the first wall 201 of the battery cell 20, which has the largest surface area, to conduct heat away from the battery cell 20. The surface of the thermally conductive member 3a connected to the first wall 201 is an insulating surface to prevent electrical connection between the thermally conductive member 3a and the battery cell 20, thereby ensuring electrical insulation within the battery 100. The thermally conductive member 3a has a dimension in a first direction x perpendicular to the first wall 201 of 0.1 to 100 mm. The thermally conductive member 3a includes a separator 33 connected to the first wall 201 of each of the plurality of battery cells 20 arranged along a second direction y, which is parallel to the first wall 201. This eliminates the need for a beam or other structure in the central portion of the battery housing 100, significantly improving the internal space utilization of the battery 100 and thereby increasing the energy density of the battery 100. Furthermore, the thermally conductive member 3a ensures electrical insulation and thermal conductivity within the battery 100. Therefore, the technical solution of the embodiment of the present application can improve the energy density of the battery 100 while ensuring electrical insulation and heat conduction in the battery 100, thereby improving the performance of the battery 100.

[0492] In some embodiments, a dimension T3 of the battery cell 20 in the first direction x and a dimension T5 of the heat conducting member 3 a in the first direction x satisfy: 0<T5 / T3≤7.

[0493] When T5 / T3 is too large, the thermal conductor 3a occupies a large space, affecting energy density. Furthermore, the thermal conductor can transfer heat to the battery cells 20 too quickly, potentially creating safety issues. For example, thermal runaway of one battery cell 20 could trigger thermal runaway in other battery cells 20 connected to the same thermal conductor. When 0 < T5 / T3 ≤ 7, the energy density and safety performance of the battery 100 are guaranteed.

[0494] In some embodiments, the dimension T3 of the battery cell 20 in the first direction x and the dimension T5 of the thermal conductor 3a in the first direction x may further satisfy 0<T5 / T3≤1, so as to further improve the energy density of the battery 100 and ensure the safety performance of the battery 100.

[0495] In some optional embodiments, the weight M1 of the battery cell 20 and the weight M2 of the heat conducting member 3 a satisfy: 0<M2 / M1≤20.

[0496] When M2 / M1 is too large, the gravimetric energy density will be lost. When 0<M2 / M1≤20, the gravimetric energy density of the battery 100 can be guaranteed and the safety performance of the battery 100 can be guaranteed.

[0497] Optionally, in one embodiment of the present application, the weight M1 of the battery cell 20 and the weight M2 of the thermal conductor 3 a may further satisfy 0.1≤M2 / M1≤1, so as to further improve the energy density of the battery 100 and ensure the safety performance of the battery 100 .

[0498] In some embodiments, the area S3 of the first wall 201 and the area S4 of the surface of the heat conductor 3 a connected to the first wall 201 of the plurality of battery cells 20 in a row satisfy 0.2≤S4 / S3≤30.

[0499] S4 represents the total surface area of ​​the side where the heat conductor 3a connects to the battery cell 20. When S4 / S3 is too large, energy density is affected. When S4 / S3 is too small, thermal conductivity is poor, impacting safety. When 0.2 ≤ S4 / S3 ≤ 30, both the energy density and safety of the battery 10 are guaranteed.

[0500] Optionally, S4 and S3 may further satisfy 2≤S4 / S3≤10, so as to further improve the energy density of the battery 100 and ensure the safety performance of the battery 100 .

[0501] In some embodiments, the specific heat capacity C of the heat conducting member 3a and the weight M3 of the heat conducting member 3a satisfy the following relationship: 0.02KJ / (kg 2 *℃)≤C / M3≤100KJ / (kg 2 *℃).

[0502] When C / M3<0.02KJ / (kg 2 *℃), the heat conductor 3a will absorb more energy, causing the temperature of the battery cell 20 to be too low, which may cause lithium deposition; C / M3>100KJ / (kg 2 *℃), the heat conducting element 3a has poor heat conductivity and cannot take away the heat in time. 0.02KJ / (kg 2 *℃)≤C / M3≤100KJ / (kg 2*℃), the safety performance of the battery 100 can be guaranteed.

[0503] Optionally, C and M3 may further satisfy the following relationship:

[0504] 0.3KJ / (kg 2 *℃)≤C / M3≤20KJ / (kg 2 *℃) ​​to further improve the safety performance of the battery 100.

[0505] In some embodiments, the battery 100 may include multiple battery modules 100a. Each battery module 100a may include at least one column of multiple battery cells 20 arranged along the second direction y and at least one thermally conductive member 3a. The at least one column of battery cells 20 and the at least one thermally conductive member 3a are alternately arranged along the first direction x. That is, for each battery module 100a, the columns of battery cells and the thermally conductive members 3a are alternately arranged along the first direction x. Multiple battery modules 100 are housed within the housing 10 to form the battery 100.

[0506] Optionally, the battery module 100a includes two columns of battery cells 20, with one thermal conductor 3a disposed between the two columns of battery cells 20. No thermal conductor 3a is disposed between adjacent battery modules 100a. Thus, this embodiment allows for fewer thermal conductors 3a to be disposed within the battery 100 while ensuring that each battery cell 20 can be connected to a thermal conductor 3a.

[0507] Optionally, multiple battery modules 100 are arranged along the first direction x, there is a gap between adjacent battery modules 100 , and there is no heat conductor 3 a between adjacent battery modules 100 , then the gap between adjacent battery modules 100 a can provide expansion space for the battery cells 20 .

[0508] Optionally, a fixing structure 103 is provided at the end of the heat conducting member 3a in the first direction x, and the heat conducting member 3a is fixed to the housing 10 via the fixing structure 103. As shown in FIG19 , the fixing structure 103 may include a fixing member 104, which is fixedly connected to the end of the heat conducting member 3a and is connected to the battery cell 20 located at the end of the heat conducting member 3a, thereby strengthening the fixing effect on the battery cell 20.

[0509] Optionally, the battery cells 20 may be adhesively fixed to the housing 11. Alternatively, adjacent battery cells 20 within each column of battery cells 20 may be adhesively fixed. For example, the second walls 2112 of two adjacent battery cells 20 may be bonded together using structural adhesive, but this embodiment of the present application is not limited thereto. Adhesive fixation between adjacent battery cells 20 within each column of battery cells 20 can further enhance the securing of the battery cells 20.

[0510] Using the battery cells 20 and thermal conductors 3a shown in Figures 10-13, where the number of battery cells 20 in a column of battery cells 20 is 2-20, the battery 10 is safety tested in accordance with GB38031-2020. The test results are shown in Tables 4 to 7. It can be seen that the battery 100 of the embodiment of the present application can meet the safety performance requirements.

[0511] Table 4

[0512] No. T5 / mmT3 / mmT5 / T3 Test results 10.2400.005 No fire, no explosion 20.450.008 No fire, no explosion 30.7450.016 No fire, no explosion 44100.4 No fire, no explosion 54400.1 No fire, no explosion 645153 No fire, no explosion 71501015 Fire, explosion

[0513] Table 5

[0514] No. M2 / KgM1 / KgM2 / M1 Test Result 10.230.068 No fire, no explosion 20.42.50.16 No fire, no explosion 30.71.50.467 No fire, no explosion 4101.56.7 No fire, no explosion 515115 No fire, no explosion

[0515] Table 6

[0516] No. S4 / mm 2 S3 / mm 2 S4 / S3 test results 13120217280.14 Fire, explosion 219500388000.5 No fire, no explosion 365000168003.87 No fire, no explosion

[0517] 4130000165767.84 No fire, no explosion 5216000960022.5 No fire, no explosion 6250000720034.72 Fire, explosion

[0518] Table 7

[0519] No. C / KJ / (Kg*℃)M2 / kgC / M2(KJ / (kg 2 *℃))Test results10.39250.016 Fire, explosion20.4650.092 No fire, no explosion30.880.51.76 No fire, no explosion440.410 No fire, no explosion540.140 No fire, no explosion640.025160 Fire, explosion

[0520] In some embodiments, as shown in Figures 15 and 35 , in the third direction, the dimension H1 of the separator 33 and the dimension H2 of the first wall 201 satisfy the following relationship: 0.1 ≤ H1 / H2 ≤ 2. The third direction is perpendicular to the second direction and parallel to the first wall. This can further maximize the space utilization within the battery 100, thereby increasing the energy density of the battery 100.

[0521] In the third direction, the dimension H1 of the partition 33 may be the height of the partition 33, and the dimension H2 of the first wall 201 may be the height of the first wall 201. The relationship between H1 and H2 satisfies: 0.1≤H1 / H2≤2.

[0522] When H1 / H2 is less than 0.1, the heat exchange area between the battery cell 20 and the separator is small, and the battery cell 20 cannot be cooled or heated in time, making it difficult to meet the thermal management requirements of the battery.

[0523] When H1 / H2>2, although the thermal management requirements of the battery 100 can be met, the partition 33 occupies more space, wasting the space utilization in the third direction, making it difficult to ensure the energy density requirements of the battery 100.

[0524] Alternatively, H1 / H2 may be 0.1, or 0.4, or 0.6, or 0.9, or 1.2, or 1.5, or 1.8, or 2, etc.

[0525] In some examples, the partition 33 is a thermal management component 3 b , which is used to adjust the temperature of the battery cell 20 . The height of the thermal management component 3 b in the third direction is H1 .

[0526] Optionally, the thermal management component 3 b may be a water cooling plate, which is used to cool the battery cells 20 during fast charging or to heat the battery cells 20 when the temperature is too low.

[0527] Optionally, the thermal management component 3b may be made of a material with good thermal conductivity, such as metal materials such as aluminum.

[0528] In some embodiments, the dimension H1 of the partition 33 and the dimension H2 of the first wall 201 further satisfy: 0.3≤H1 / H2≤1.3. In this way, the temperature of the battery cell 20 can be guaranteed not to exceed 55°C during fast charging.

[0529] Optionally, H1 / H2 can be 0.3, or 0.5, or 0.8, or 1.0, or 1.1, or 1.3, etc.

[0530] Optionally, in one embodiment of the present application, the heat exchange area between the first wall 201 and the partition is S, and the relationship between the capacity Q of the battery cell 20 and the heat exchange area S satisfies: 0.03Ah / cm 2≤Q / S≤6.66Ah / cm 2 .

[0531] The heat exchange area S may be the contact area between the first wall 201 and the partition 33 . The heat exchange area S5 satisfies: S=H1*L, where L is the size of each battery cell 20 along the second direction y.

[0532] When Q / S is less than 0.03 Ah / cm2, the heat exchange area S is large enough to meet the thermal management requirements of the battery. However, the space occupied by the partition 33 is too large to meet the energy density requirements of the battery 100.

[0533] When Q / S>6.66Ah / cm2, the heat exchange area S is small, the heat of the battery cell 20 cannot be promptly discharged through the partition 33, and the battery cell 20 cannot be quickly cooled in time, making it difficult to meet the thermal management requirements.

[0534] By adjusting the relationship between the heat exchange area S and the capacity Q of the battery cell 20, the temperature of the battery cell 20 can be maintained within a suitable range during the battery charging process, especially during fast charging. In addition, when the capacity Q of the battery cell is constant, the heat exchange area S can be adjusted to flexibly meet the thermal management requirements of the battery.

[0535] In a possible implementation, the size H1 of the partition 33 is 1.5 cm to 30 cm. In this way, the temperature of the battery cell 20 can be guaranteed not to exceed 55° C. during the fast charging process.

[0536] The battery was charged and tested. The test results are shown in Table 8.

[0537] Table 8 Temperature test of battery cells and thermal management components of different specifications during charging

[0538]

[0539] In some embodiments, as shown in FIG. 12 and FIG. 32 , a cavity 30 a is provided inside the partition 33 .

[0540] In this way, the partition 33 with a cavity structure has the ability to absorb deformation, which can absorb the expansion deformation of the battery cell 20 and improve the performance of the battery 100; in other words, the cavity 30a can make the partition 33 have a larger compression space in the first direction x, thereby providing a larger expansion space for the battery cell 20.

[0541] In addition, the cavity 30 a can reduce the weight of the partition 33 while ensuring the strength of the partition 33 , and can be applied, for example, to a case where the thickness of the partition 33 is relatively large.

[0542] Optionally, the cavity 30a can be used to accommodate a heat exchange medium to regulate the temperature of the battery cell 20. This allows the temperature of the battery cell 20 to be easily adjusted within an appropriate range at any time, thereby improving the stability and safety of the battery cell 20. Thus, the cavity 30a can also be referred to as a heat exchange cavity, and the cavity 30a corresponds to one or more flow channels 30c for accommodating the heat exchange medium.

[0543] It should be understood that the fluid mentioned here can be a liquid that can adjust the temperature and does not chemically react with the material of the cavity 30a, such as water, and this application does not limit this.

[0544] In some embodiments, as shown in Figures 12 and 32, in a first direction x, the size of the cavity 30a is W, and the capacity Q of the battery cell 20 and the size W of the cavity 30a satisfy the following relationship: 1.0 Ah / mm ≤ Q / W ≤ 400 Ah / mm. The first direction x is perpendicular to the first wall 201, so that the separator 33 can be effectively utilized to prevent heat diffusion between the battery cells 20. By rapidly cooling a battery cell 20 with an excessively high temperature, the heat of the battery cell 20 can be prevented from diffusing and transferring to adjacent battery cells 20, thereby preventing the adjacent battery cells 20 from overheating.

[0545] When Q / W is greater than 400 Ah / mm, the size W of the cavity 30a is small, and the volume of fluid that can be accommodated or flowed through the cavity 30a is small, making it impossible to promptly cool the battery cells 20. Consequently, when the temperature of a battery cell 20 is too high, due to the lack of timely cooling of that battery cell 20, the heat from that battery cell 20 diffuses to adjacent battery cells 20, causing the adjacent battery cells 20 to overheat and become abnormal, thus affecting the performance of the entire battery 10.

[0546] When Q / W is less than 1.0 Ah / mm, the size W of the cavity 30a is larger, and the volume of fluid that can be accommodated or flowed through the cavity 104 is larger, which can fully cool the battery cell 20. However, the larger size of the cavity 30a results in a larger space occupied by the separator 33, which cannot guarantee the energy density of the battery 100. At the same time, the excessively large separator 33 also increases the cost.

[0547] The cavity 30a can be formed by a pair of heat-conducting plates 333 within the partition 33. The dimension W of the cavity 30a along the first direction x can be the distance between the inner walls of the two heat-conducting plates 333 along the first direction x. A larger dimension W of the cavity 30a increases the volume of the cavity 30a and the volume of fluid that can be accommodated or flowed through the cavity 30a, thereby accelerating heat transfer between the battery cells 20 and the partition 33. For example, if the partition 33 is a water-cooled plate, a larger dimension W of the cavity 30a allows faster heat dissipation from the battery cells 20, resulting in faster cooling of the battery cells 20 and preventing heat from spreading to adjacent battery cells 20. Optionally, the fluid can be circulated to achieve better temperature regulation. The fluid can be water, a mixture of water and ethanol, a refrigerant, or air, among others.

[0548] Figure 36 is a schematic diagram of the connection between a battery cell and a thermal management component according to one embodiment of the present application. Figure 37 is a cross-sectional view along the AA direction in Figure 36, and Figure 38 is an enlarged schematic diagram of region G in Figure 37. In one embodiment of the present application, referring to Figures 36 to 38, the dimension T3 of the battery cell 20 along the first direction x and the dimension H of the thermal management component 3b along the third direction satisfy the following relationship: 0.03 ≤ T3 / H ≤ 5.5, with the third direction being perpendicular to the first and second directions.

[0549] The dimension T3 of the battery cell 20 along the first direction x may be the thickness T3 of the battery cell 20 . The thickness T3 of the battery cell 20 is related to the capacity Q of the battery cell 20 . The larger the thickness T3 , the larger the capacity Q.

[0550] The dimension H1 of the partition 33 along the third direction can be the height H of the thermal management component 3b along the third direction. A larger H indicates a larger volume of the thermal management component 3b, which occupies more space and has a stronger thermal management capability. For example, when the thermal management component 3b is a water-cooled plate, a larger H indicates a stronger cooling capability for the battery cell 20, and more effectively prevents heat from spreading from one battery cell 20 to adjacent battery cells 20.

[0551] When T3 / H is less than 0.03, the dimension H of the thermal management component 3b along the third direction is larger, which can fully meet the requirement of preventing heat diffusion of the battery cell 20, but it is difficult to meet the energy density requirement of the battery 10. At the same time, the larger volume of the thermal management component 3b will also lead to a reduction in production costs.

[0552] When T3 / H>5.5, the thermal management component 3b is unable to meet the thermal management requirements of the battery cell 20, that is, it cannot dissipate the heat of the battery cell 20 in time, causing the heat to spread to adjacent battery cells 20, causing abnormal temperatures in other battery cells 20, and thus affecting the performance of the battery 10.

[0553] In some embodiments, the dimension H1 of the partition 33 along the third direction is 15 mm to 300 mm. In this way, the partition 33 can meet the requirements of both strength and thermal management performance.

[0554] In some embodiments, the size W of the cavity 30a is 0.8 mm to 50 mm, so as to meet both strength and thermal management requirements.

[0555] The following is a thermal diffusion test of the battery 100 using a combination of two rows of battery cells 20 and two separators 33 according to GB38031-2020. The test results are shown in Table 8-1.

[0556] Table 8-1 Thermal diffusion test of battery cells and separators of different specifications

[0557] (Q / Ah)(T3 / mm)(H / mm)(W / mm)Q / WT3 / HWhether thermal diffusion 28088260505.60.3385No28088260646.66670.3385No28088102646.66670.8627No28088102393.33330.8627No280881020.83500.8627No2808830646.66672.9333No28088130.6466.66676.769 2 Yes 24866.58021240.8313 No 24866.51020.83100.652 No 16970102356.66660.6863 No 7028.51022350.2794 No 18079802900.9875 No 11733.21020.8146.250.3255 No 512.55031.66670.25 No 512.515031.66670.0833 No 512.51020.86.250.1225 No

[0558] In some embodiments, as shown in Figures 32, 33 and 38, the partition 33 further includes a pair of heat conducting plates 333 arranged opposite to each other along a first direction, the cavity 30a is arranged between the pair of heat conducting plates 333, and the first direction is perpendicular to the first wall 201.

[0559] For example, each heat conducting plate 333 extends along the second direction, and the two heat conducting plates 333 are opposite to each other along the first direction to form a cavity 30a between the two heat conducting plates 333. The cavity 30a can serve as a flow channel for the heat exchange medium, so that the partition 33 is formed into a heat conducting member 3a or a heat management component 3b.

[0560] In some embodiments, as shown in FIG. 32 , a dimension D of the heat conducting plate 333 in the first direction x is 0.1 mm to 5 mm.

[0561] When the dimension D of the heat conducting plate 333 in the first direction is too small, and the space inside the partition 33 is constant, the cavity 30a occupies most of the space of the partition 33. In this case, the rigidity of the partition 33 is very poor and the structural strength of the battery 10 cannot be effectively improved. When the dimension D of the heat conducting plate 333 in the first direction is too large, the cavity 30a inside the partition 33 is very small and can accommodate very little fluid, and cannot effectively regulate the temperature of the battery cell 20. Therefore, the value of D is set to 0.1mm~5mm.

[0562] Optionally, the size D of the pair of heat conducting plates 333 of the partition 333 in the first direction may be the same or different.

[0563] Optionally, the two heat conducting plates 333 may be made of a material with good thermal conductivity, such as metal materials such as aluminum.

[0564] In some embodiments, as shown in FIG. 33 and FIG. 38 , the partition 33 further includes a reinforcing rib 334 . The reinforcing rib 334 is disposed between the pair of heat conducting plates 33 to enhance the structural strength of the partition 33 .

[0565] Optionally, the number of the reinforcing rib 334 is one, so that one or more cavities 30 a can be formed between a pair of heat conducting plates 333 .

[0566] Optionally, when there are multiple cavities 30a, different cavities 30a may be independent of each other or connected via adapters.

[0567] When the reinforcing rib 334 is connected to only one of the pair of heat conducting plates 333, the reinforcing rib 334 is a cantilever connected to the heat conducting plate 333 at one end. In this case, the cavity 30a can correspond to one flow channel 30c; when the reinforcing rib 334 is connected to each of the pair of heat conducting plates 333, the cavity 30a can correspond to multiple flow channels 30c. The number of reinforcing ribs 334 can be set according to specific needs, and this embodiment of the application does not limit this.

[0568] In some embodiments, as shown in FIG. 33 and FIG. 45 , a reinforcing rib 334 is connected to at least one of the pair of heat conducting plates 333 to further ensure the structural strength of the partition 333 .

[0569] Optionally, as shown in FIG. 33 , the reinforcing rib 334 may be provided on only one heat conducting plate 333 , or the reinforcing rib 334 may be provided between a pair of heat conducting plates 333 and connected to the pair of heat conducting plates 333 .

[0570] Optionally, as shown in FIG33 , when the reinforcing rib 334 is connected to a pair of heat conducting plates 333 , the angle between the reinforcing rib 334 and the heat conducting plates 333 may be an acute angle to provide more expansion space for the battery cell 20 ; as shown in FIG33 , when the reinforcing rib 334 is connected to a heat conducting plate 333 , the angle between the reinforcing rib 334 and the heat conducting plate 333 may also be a right angle, so that the partition can withstand greater pressure.

[0571] Optionally, the reinforcing ribs 334 may be of a special shape, such as a C-shape, a wave shape, or a cross shape, which can effectively absorb expansion, increase turbulence, and enhance the heat exchange effect.

[0572] In some embodiments, as shown in Figure 45, the reinforcing rib 334 includes a first reinforcing rib 3341, and the two ends of the first reinforcing rib 3341 are respectively connected to a pair of heat conducting plates 333. The first reinforcing rib 3341 is used to support the pair of heat conducting plates 333. When the partition 333 is deformed to absorb the expansion force of the battery cell 20, the first reinforcing rib 3341 can be deformed to adapt to the pair of heat conducting plates 33 to move closer to each other at least partially along the first direction x.

[0573] Among them, the first reinforcing rib 3341 is tilted relative to the first direction x, so the angle between the first reinforcing rib 3341 and one of the pair of heat conducting plates 333 is less than 90°, which can improve the bending property of the first reinforcing rib 3341 and can better deform to meet the requirement of the partition 33 to absorb the expansion force, avoiding the risk of small deformation space and easy breakage and failure due to the flat shape.

[0574] Optionally, there may be one or more first reinforcing ribs 3341 , and a plurality of first reinforcing ribs 3341 may be arranged at intervals along the third direction; wherein, the interval size between two adjacent first reinforcing ribs 3341 may be the same or different.

[0575] Optionally, the material of the first reinforcing rib 3341 can be made of a reinforcing rib structure, which can achieve a lightweight design of the partition 333 while ensuring the supporting function, thereby achieving a lightweight design of the entire battery 100.

[0576] Optionally, the first reinforcing rib 3341 is connected to a pair of heat conducting plates 333 , and the first reinforcing rib 3341 extends along the second direction y to increase the connection area between the first reinforcing rib 3341 and each heat conducting plate 333 , thereby improving the supporting strength.

[0577] Optionally, the first reinforcing rib 3341 is a plate-shaped structure, so that it can be better deformed to meet the requirement of the separator to absorb the expansion force of the battery cell 20; and it is conducive to production and processing and improves manufacturing efficiency.

[0578] In some embodiments, as shown in Figure 45, the angle range between the first reinforcing rib 3341 and the first direction x is 30°-60°, and the angle range between the first reinforcing rib 3341 and the above-mentioned one of the pair of heat conducting plates 333 is 30°-60°, which is conducive to better deformation while meeting the support requirements and is not easy to break.

[0579] Optionally, when there are multiple first reinforcing ribs 3341 , the inclination directions of two adjacent first reinforcing ribs 3341 may be the same or different.

[0580] In some embodiments, as shown in Figure 45, the reinforcing rib 334 also includes a second reinforcing rib 3342, one end of the second reinforcing rib 3341 is connected to one of the pair of heat conducting plates 333, and the other end of the second reinforcing rib 3342 is spaced apart from the other of the pair of heat conducting plates 333. For example, the extension dimension of the second reinforcing rib 3342 in the first direction x is smaller than the distance between the pair of heat conducting plates 333.

[0581] Therefore, by setting the above-mentioned second reinforcing rib 3342, it can not only work together with the first reinforcing rib 3341 to achieve a better support effect, but also control the deformation range of the partition 33. When the second reinforcing rib 3342 of one of a pair of heat conducting plates 333 contacts the other, the deformation of the partition 33 can be further limited to avoid blockage of the flow channel 30c corresponding to the cavity 30a, thereby ensuring the effectiveness of the flow channel 30c and thus ensuring the effectiveness of the partition 33.

[0582] Optionally, a pair of heat conducting plates 333 are respectively a first heat conducting plate 3331 and a second heat conducting plate 3332, and the second reinforcing rib 3342 can be set on the first heat conducting plate 3331 or on the second heat conducting plate 3332. Exemplarily, both the first heat conducting plate 3331 and the second heat conducting plate 3332 are provided with the second reinforcing rib 3342.

[0583] In some embodiments, as shown in FIG45 , in the third direction, a second reinforcing rib 3342 is provided between two adjacent first reinforcing ribs 3341. Optionally, one of the two adjacent second reinforcing ribs 3342 is provided on the first heat conducting plate 3331, and the other is provided on the second heat conducting plate 3332, to ensure that the first heat conducting plate 3331 and the second heat conducting plate 3332 are evenly stressed and do not bear too much weight.

[0584] In some embodiments, as shown in FIG. 45 , the second reinforcing rib 3342 extends along the first direction x and protrudes from one of the pair of heat conducting plates 333 , thereby simplifying the structure of the second reinforcing rib 3342 and facilitating processing.

[0585] Optionally, the second reinforcing rib 3342 is in the shape of a polygonal column so that the second reinforcing rib 3342 has a sufficient cross-sectional area. When the partition 33 absorbs the expansion force of the battery cell 20 and deforms to the point where the second reinforcing rib 3342 provided on one of a pair of heat conducting plates 333 contacts the other, the second reinforcing rib 3342 can have a sufficient contact area to better improve the supporting capacity and avoid damage or even failure of the second reinforcing rib 3342 resulting in contact between the two heat conducting plates 333, thereby ensuring the effectiveness of the partition 33.

[0586] In some embodiments, as shown in FIG. 45 , the first reinforcing rib 3341 and the second reinforcing rib 3342 are spaced apart to ensure that the two heat conducting plates 333 are subjected to relatively uniform force.

[0587] In some embodiments, the first reinforcing ribs 3341 and the second reinforcing ribs 3342 are alternately distributed along a third direction (for example, the height direction of the box body 10). For example, two adjacent first reinforcing ribs 3341 and second reinforcing ribs 3342 can be alternately arranged on the first heat conducting plate 3331 and the second heat conducting plate 3332. Of course, the position of the second reinforcing ribs 3342 can also be arranged according to a certain arrangement pattern.

[0588] Illustratively, in the third direction, one of the two adjacent second reinforcing ribs 3342 is provided on the first heat conducting plate 3331 and the other is provided on the second heat conducting plate 3332 to ensure that the first heat conducting plate 3331 and the second heat conducting plate 3332 are evenly stressed and do not bear too much weight.

[0589] By setting it in this way, the uniformity of the support effect on the two heat conducting plates 333 can be guaranteed, and each part of the flow channel 30c corresponding to the cavity 30a along the second direction y will not be blocked, which can well ensure the effectiveness of the flow channel 30c.

[0590] In some embodiments, as shown in FIG. 32 and FIG. 45 , in the first direction x, the thickness D of the heat conducting plate 333 and the size W of the cavity 30a of the partition 33 satisfy: 0.01≤D / W≤25, so as to take into account both strength and thermal management performance requirements.

[0591] Specifically, when the dimension W of the cavity 30a is large, the flow resistance of the fluid in the cavity 30a is low, which can increase the heat exchange per unit time of the partition 33. When the thickness D of the heat conductive plate 333 is large, the strength of the partition 33 is high. When D / W is less than 0.01, the dimension W of the cavity 30a is large enough, but the space occupied is too large. Alternatively, within the given space of the partition 33, the thickness D of the heat conductive plate 333 may be too thin, resulting in insufficient strength. For example, it may not meet the vibration and impact requirements of the battery 20, and may even cause the partition 33 to collapse during initial assembly. When D / W ≥ 25, the thickness D of the heat conducting plate 333 is sufficiently thick. However, given the space provided by the separator 33, the dimension W of the cavity 30a may be too small, increasing the flow resistance of the fluid in the cavity 30a, deteriorating heat exchange performance, or even causing clogging of the cavity 30a during use. Furthermore, due to the excessive thickness of the heat conducting plate 333, the force generated by the expansion of the battery cells 20 cannot meet the compressive force on the separator 33 corresponding to the space required for expansion. This means that the separator 33 cannot promptly relinquish the required expansion space for the battery cells 20, accelerating the capacity reduction of the battery cells 20. Therefore, when the thickness D of the heat conducting plate 333 and the dimension W of the cavity 30a satisfy 0.01 ≤ D / W ≤ 25, both strength and thermal management requirements can be met, ensuring the performance of the battery 100.

[0592] Optionally, when 0.01≤D / W≤0.1, the fluid can be a solid-liquid phase change material or a liquid working fluid, the outer layer of the partition 33 can be a membrane material as a skin, and the inside can be filled with a skeleton structure for reinforcement. This solution can be used in situations where the strength requirements are low or the compressibility requirements of the partition 33 are high.

[0593] Optionally, when the ratio is 0.1≤D / W≤1, a fluid convection heat exchange or vapor-liquid phase change cooling solution may be used inside the partition 33 , with the liquid working medium being used as the heat exchange medium to ensure the heat exchange performance of the partition 33 .

[0594] Optionally, when 1≤D / W≤25, the partition 33 can adopt a vapor-liquid phase change cooling scheme. By adjusting the internal gap, the overall pressure is increased to ensure that the working fluid exists in liquid form inside the partition 33, preventing the coexistence of vapor and liquid due to pressure loss, and improving heat exchange performance; at the same time, the thickness D of the heat conducting plate 333 is thick enough to prevent the partition 33 from rupturing due to the increase in the vaporization pressure of the internal working fluid during heating.

[0595] Optionally, the thickness D of the heat conducting plate 333 and the size W of the cavity 30 a further satisfy 0.05≤D / W≤15, and further satisfy 0.1≤D / W≤1, so as to better balance space, strength and thermal management and further improve the performance of the battery 100 .

[0596] Optionally, a dimension T1 of the partition 33 in the first direction x is 0.3 mm to 100 mm.

[0597] T1 is the total thickness of the thermal management component separator 33, i.e., T1 = 2*D + W. A T1 that is too large will occupy too much space, while a T1 that is too small will result in low strength or a narrow cavity 30a, affecting thermal management performance. Therefore, a total thickness T1 of 0.3 mm to 100 mm for the separator 33 can balance space, strength, and thermal management, ensuring the performance of the battery 100.

[0598] Optionally, the thickness D of the heat conducting plate 333 is 0.1 mm to 25 mm.

[0599] If the thickness D of the heat conducting plate 333 is too large, it will occupy too much space and the separator 33 will not be able to promptly make room for the expansion of the battery cells 20. If D is too small, the strength will be too low. Therefore, when the thickness D of the heat conducting plate 333 is between 0.1 mm and 25 mm, it can balance space, strength, and the expansion requirements of the battery cells 20, ensuring the performance of the battery 100.

[0600] Optionally, a dimension W of the cavity 30a in the first direction is 0.1 mm to 50 mm.

[0601] Specifically, the size W of cavity 30a must be at least larger than the size of any impurity particles that may be present inside to prevent clogging during use. Furthermore, if the size W of cavity 30a is too small, the flow resistance of the fluid in cavity 30a increases, and heat exchange performance deteriorates. Therefore, the size W of cavity 30a should be no less than 0.1 mm. A size W that is too large will occupy too much space or lack strength. Therefore, a size W of cavity 30a of 0.1 mm to 50 mm can balance space, strength, and thermal management performance, ensuring the performance of battery 100.

[0602] Optionally, the dimension T1 of the partition 33 in the first direction x and the area S3 of the first wall 201 satisfy: 0.03 mm -1 ≤T1 / S3*1000≤2mm -1 .

[0603] When T1 and S3 meet the above conditions, the heat exchange performance and size requirements of the battery cell 20 can be met. Specifically, when the area S3 of the first wall 201 of the battery cell 20 is larger, the cooling area is larger, which can reduce the heat transfer resistance from the partition 33 to the surface of the battery cell 20; when the total thickness T1 of the partition 33 is larger, the strength can be improved. If T1 / S3*1000 is less than 0.03mm -1 The area S3 of the first wall 201 of the battery cell 20 is large enough, but the separator 33 is too thin, resulting in insufficient strength. The separator 33 may be damaged or cracked during use. If T1 / S3*1000 is greater than 2mm -1, the partition 33 is thick enough, but the area S3 of the first wall 201 of the battery cell 20 is too small, and the partition 33 can provide insufficient cooling surface for the battery cell 20, which may lead to the risk of failing to meet the heat dissipation requirements of the battery cell 20. Therefore, the total thickness T1 of the partition 33 and the area S3 of the first wall 201 meet the requirement of 0.03mm -1 ≤T1 / S*1000≤2mm -1 At the same time, the strength and thermal management performance requirements can be taken into account at the same time to ensure the performance of the battery 100.

[0604] Optionally, the partition 33 further includes a reinforcing rib 334 disposed between the pair of heat conducting plates 333. The thickness X of the reinforcing rib 334 is not less than (-0.0005*F+0.4738) mm, where F is the tensile strength of the material of the reinforcing rib 334, expressed in MPa. In other words, the minimum thickness X of the reinforcing rib 334 can be (-0.0005*F+0.4738) mm.

[0605] The thickness X of the reinforcing rib 334 is related to the tensile strength of its material. According to the above relationship, to meet the load-bearing requirements of the partition 33, the stronger the material, the thinner the thickness X of the internal reinforcing rib 334 can be, thereby saving space and increasing energy density. Optionally, the thickness X of the reinforcing rib 334 can range from 0.2 mm to 1 mm.

[0606] Using the battery cell 20 and separator 33 shown in FIG. 45 , simulation tests of heating rate and separator 33 deformation force were conducted. The test results are shown in Table 9. In Table 9, L is the dimension of the battery cell 20 in the second direction y, T3 is the dimension of the battery cell 20 in the first direction x, and H2 is the dimension of the first wall 201 of the battery cell 20 in the third direction, which is perpendicular to the first direction x and the second direction y.

[0607] Table 9

[0608]

[0609]

[0610] In some embodiments, as shown in Figures 47, 48, 50 and 51, the partition 33 is provided with a medium inlet 3412 and a medium outlet 3422, and the cavity 30a is connected to the medium inlet 3412 and the medium outlet 3422, so that the cavity 30a can accommodate a heat exchange medium to regulate the temperature of the battery cell 20; the interior of the partition 33 is provided with a cavity 30b that is disconnected from both the medium inlet 3412 and the medium outlet 3422, so that the cavity 30b can prevent the heat exchange medium from entering, so as to regulate the temperature of the battery cell 20 while reducing the weight of the partition 33, thereby achieving lightweighting of the partition 33 and alleviating the phenomenon of the heat exchange medium entering the cavity 30b and causing the weight of the partition 33 to increase during use, thereby effectively reducing the weight of the battery 100 having such a partition 33, which is beneficial to improving the energy density of the battery 100 and thus improving the performance of the battery 100.

[0611] For example, the medium inlet 3412 and the medium outlet 3422 are respectively disposed at both ends of the partition 33, and the cavity 30a and the cavity body 30b are both disposed within the partition 33. The cavity 30a is connected to the medium inlet 3412 and the medium outlet 3422, i.e., both ends of the cavity 30a are in communication with the medium inlet 3412 and the medium outlet 3422, respectively, allowing the fluid medium to flow into or out of the cavity 30a. The cavity body 30b is disconnected from both the medium inlet 3412 and the medium outlet 3422, i.e., the cavity 30b is not in communication with either the medium inlet 3412 or the medium outlet 3422, preventing the fluid medium from entering the cavity 30b.

[0612] It should be noted that the cavity 30b disposed within the partition 33 may be one or more, and similarly, the cavity 30a disposed within the partition 33 may be one or more. When there are multiple cavities 30a, each cavity 30a is connected to the medium inlet 3412 and the medium outlet 3422, that is, both ends of the multiple cavities 30a are connected to the medium inlet 3412 and the medium outlet 3422, respectively. For example, in the embodiment of the present application, there are multiple cavities 30a and 30b disposed within the partition 33.

[0613] In some embodiments, referring to Figures 47 and 48 , the separator 33 includes a main body 331 (or body portion), a first manifold 341, and a second manifold 342. The main body 331 is provided with a cavity 30a and a cavity 30b. Along the length of the main body 331 (i.e., the second direction y), the first manifold 341 and the second manifold 342 are respectively disposed at both ends of the main body 331. The medium inlet 3412 and the medium outlet 3422 are respectively disposed at the first manifold 341 and the second manifold 342.

[0614] The cavity 30a and the cavity body 30b are both disposed within the main body plate 331. For example, in FIG48 , the cavity 30a and the cavity body 30b extend along the length of the main body plate 331, and both ends of the cavity 30a pass through both ends of the main body plate 331, so that the cavity 30a can communicate with the medium inlet 3412 of the first manifold 341 and the medium outlet 3422 of the second manifold 342.

[0615] It should be noted that the main plate 331, the first conduit 341 and the second conduit 342 can be an integral structure or a split structure. When the main plate 331, the first conduit 341 and the second conduit 342 are an integral structure, the main plate 331, the first conduit 341 and the second conduit 342 can be made by casting or injection molding. When the main plate 3315, the first conduit 341 and the second conduit 342 are a split structure, the first conduit 341 and the second conduit 342 can be connected to the two ends of the main plate 331 by bolting, clamping or bonding.

[0616] In some embodiments, as shown in Figures 48-51 , a channel 3151 is provided inside the main plate 331. The channel 3151 runs through both ends of the main plate 331 in the longitudinal direction of the main plate 331. The partition 33 further includes a blocking member 318 connected to the main plate 331. The blocking member 318 blocks both ends of the channel 3151 to form the cavity 30b.

[0617] Among them, along the length direction of the main body plate 331, the channel 3151 passes through the main body plate 331 and is provided with sealing parts 318 at both ends. After the two ends of the channel 3151 are blocked by the sealing parts 318, a closed cavity 30b can be formed, thereby achieving the disconnection of the cavity 30b from the medium inlet 3412 and the medium outlet 3422.

[0618] Exemplarily, the sealing member 318 can be a metal sheet, a rubber plug or a silicone plug, etc. In the actual production process, different sealing members 318 can be used according to the size of the channel 3151. For example, when the channel 3151 is large, the metal sheet can be welded to one end of the main plate 331 to seal the channel 3151, or a rubber plug or a silicone plug can be used to seal the channel 3151. When the channel 3151 is small, the metal sheet is difficult to weld, and a rubber plug or a silicone plug can be used to be stuck in the channel 3151 to achieve the sealing effect on the channel 3151.

[0619] In some embodiments, as shown in Figures 48-51 , the blocking member 318 is detachably connected to the main plate 331. The detachable connection of the blocking member 318 to the main plate 331 allows for quick removal and replacement. This facilitates blocking different channels 3151 as needed during use to meet different usage requirements. Furthermore, the blocking member 318 can be repaired and replaced, which helps extend the service life of the partition 33.

[0620] Exemplarily, the blocking member 318 is clamped to one end of the channel 3151 to block the channel 3151. Of course, in other embodiments, the blocking member 318 can also be detachably connected to the main plate 331 by means of bolts, screw connections, or buckle connections.

[0621] It should be noted that in Figures 48 to 51, the cavity 30b is a closed structure formed by a sealing member 318 that blocks the channel 3151 inside the main plate 331. In other embodiments, as shown in Figure 50, the cavity 30b can also be a structure formed by integrally molding the main plate 331. That is to say, the cavity 30b is a structure with a cavity inside the main plate 331 formed by casting or stamping, that is, the sealing member 318 and the main plate 331 are an integrated structure.

[0622] A channel 3151 is formed inside the main plate 331 and passes through both ends of the main plate 331 in the longitudinal direction of the main plate 331. A blocking member 318 is provided on the main plate 331 so that the blocking member 318 blocks both ends of the channel 3151, thereby forming a cavity 30b that is disconnected from both the medium inlet 3412 and the medium outlet 3422. The structure is simple, easy to manufacture and process, and can block different channels 3151 according to actual needs, thereby expanding the scope of application of the partition 33.

[0623] In some embodiments, a first chamber communicating with the medium inlet 3412 is formed inside the first conduit 341, a second chamber communicating with the medium outlet 3422 is formed inside the second conduit 342, and the flow channel 30c passes through both ends of the main plate 331 in the length direction of the main plate 331 to communicate with the first chamber and the second chamber.

[0624] Among them, a first chamber connected to the medium inlet 3412 is formed inside the first conduit 341, that is, a first chamber is formed inside the first conduit 341, and the medium inlet 3412 passes through the cavity wall of the first chamber, so that when the first conduit 341 is installed on one end of the main plate 331, the flow channel 30c passing through one end of the main plate 331 can be connected to the first chamber inside the first conduit 341, so that multiple flow channels 30c are interconnected with the first chamber of the first conduit 341, so as to realize the communication between multiple flow channels 30c and the medium inlet 3412.

[0625] Similarly, a second chamber connected to the medium outlet 3422 is formed inside the second conduit 342, that is, a second chamber is formed inside the second conduit 342, and the medium outlet 3422 passes through the cavity wall of the second chamber, so that when the second conduit 342 is installed on one end of the main plate 331, the flow channel 30c passing through one end of the main plate 331 can be connected to the second chamber inside the second conduit 342, so that multiple flow channels 30c are interconnected with the second chamber of the second conduit 342, so that multiple flow channels 30c are all connected to the medium outlet 342.

[0626] It should be noted that the cavity 30 b is not connected to the first chamber of the first flow collector 341 and the second chamber of the second flow collector 342 , so that the cavity 30 b is disconnected from both the medium inlet 3412 and the medium outlet 3422 .

[0627] The first conduit 341 is provided with a first chamber connected to the flow channel 30c, and the second conduit 342 is provided with a second chamber connected to the medium outlet 3422, so that the flow channel 30c can be connected to both the first chamber and the second chamber after passing through both ends of the main plate 331, so as to realize that the flow channel 30c is connected to both the medium inlet 3412 and the medium outlet 3422, so that during use, fluid medium can be simultaneously injected into multiple flow channels 30c through the medium inlet 3412 and the medium outlet 3422 to improve usage efficiency.

[0628] In some embodiments, as shown in Figures 47 and 48, the cavity 30b and the cavity 30a both extend along the length direction of the main plate 331 and are arranged along the width direction of the main plate 331 (ie, the third direction z).

[0629] The partition 33 is provided with a cavity 30a and multiple cavities 30b. The cavity 30a corresponds to multiple flow channels 30c. The cavities 30b and the flow channels 30c both extend along the length of the main plate 331, and the multiple cavities 30b and the multiple flow channels 30c are arranged along the width of the main plate 331. The multiple cavities 30b and the multiple flow channels 30c can be arranged in various ways. For example, the cavities 30b and the multiple flow channels 30c can be arranged alternately, or along the width of the main plate 331, with the multiple cavities 30b located on one side of the multiple flow channels 30c. Alternatively, the multiple cavities 30b can be arranged in the middle of the main plate 331 along the width of the main plate 331, with the flow channels 30c on both sides of the multiple cavities 30b. For example, in Figure 48, two flow channels 30c are provided in the middle position of the main plate 331 along the width direction of the main plate 331, and three cavities 30b are provided on both sides of the two flow channels 30c, and a flow channel 30c is provided at both ends of the main plate 331.

[0630] The cavity 30b and the flow channel 30c both extend along the length direction of the main plate 331 and are arranged along the width direction of the main plate 331, thereby facilitating the processing and manufacturing of the cavity 30b and the flow channel 30c, and facilitating the optimization of the arrangement position of the flow channel 30c, thereby facilitating the improvement of the partition 33's ability to regulate the temperature of the battery 100.

[0631] In some embodiments, as shown in FIG. 48 and FIG. 49 , a flow channel 30 c is provided in the middle of the main body plate 331 along the width direction of the main body plate 331 .

[0632] A flow channel 30c is provided in the middle of the main plate 331. If there is one flow channel 30c, the flow channel 30c is provided in the middle of the main plate 331. If there are multiple flow channels 30c, at least some of the multiple flow channels 30c are located in the middle of the main plate 331 in the width direction of the main plate 331. For example, in Figures 48 and 49, two flow channels 30c are provided in the middle of the main plate 331 along the width direction of the main plate 331. Of course, in other embodiments, one, three, or four flow channels 30c may also be provided in the middle of the main plate 331 along the width direction of the main plate 331.

[0633] The main plate 331 is provided with a flow channel 30 c in the middle position in the width direction thereof, so as to perform heat exchange at the heat concentrated area inside the battery 100 , which is beneficial to improving the thermal management performance of the separator 33 on the battery 100 .

[0634] In some embodiments, referring to FIG51 , FIG51 is a cross-sectional view of a main plate 331 of a separator 33 provided in some other embodiments of the present application. The separator 33 is provided with a plurality of flow channels 30c and a plurality of cavities 30b. The cavities 30b and flow channels 30c are alternately arranged along the width direction of the main plate 331.

[0635] Among them, the cavity 30b and the flow channel 30c are arranged alternately, that is, the cavity 30b and the flow channel 30c are arranged alternately in sequence along the width direction of the main plate 331, that is, along the width direction of the main plate 331, a cavity 30b is provided between two adjacent flow channels 30c, and a flow channel 30c is provided between two adjacent cavities 30b.

[0636] The cavity 30b and the flow channel 30c are arranged alternately along the width direction of the main plate 331. That is, there are multiple cavities 30b and flow channels 30c, and the cavities 30b and the flow channels 30c are arranged alternately with each other to achieve a dispersed arrangement of the flow channels 30c along the width direction of the main plate 331, thereby effectively reducing the uneven heat exchange capacity of the partition 33 caused by the concentration of the flow channels 30c, and thus helping to improve the performance of the partition 33.

[0637] In some embodiments, as shown in Figure 49, along the thickness direction of the main plate 331 (i.e., the first direction x), the main plate 331 has two opposite side surfaces 3312, the area of ​​one side surface 3312 is S5, and the total area of ​​the projection of the flow channel 30c on the side surface 3312 is S6, satisfying that S6 / S5≥0.2.

[0638] Among them, the area of ​​one side surface 3312 is S5, the total area of ​​the projection of the flow channel 30c on the side surface 3312 is S6, S6 / S5≥0.2, that is, the total area occupied by multiple flow channels 30c on the side surface 3312 of the main plate 331 is greater than or equal to 20%.

[0639] By making the area occupied by multiple flow channels 30c on the side surface 3312 of the main plate 331 greater than or equal to 20%, the phenomenon of poor heat exchange capacity caused by the flow channels 30c occupying too little area can be reduced, thereby ensuring the heat exchange performance of the partition 33.

[0640] In some embodiments, as shown in Figures 46 and 47 , the cavities 30a of multiple separators 33 are connected in series, i.e., the medium inlet 3412 of one separator 33 is connected to the medium outlet 3422 of another separator 33. Alternatively, the flow channels 30c of multiple separators 33 may be connected in parallel, i.e., the medium inlets 3412 of multiple separators 33 are connected to each other, and the medium outlets 3422 of multiple separators 33 are connected to each other. The battery 100 is provided with multiple separators 33, which helps improve the thermal management capabilities of the separators 33 for the battery cells 20, thereby reducing safety risks caused by internal temperature rise in the battery 100.

[0641] In some embodiments, as shown in FIG. 46 and FIG. 47 , the medium outlet 3422 of one partition 33 is in communication with the medium inlet 3412 of another partition 33 .

[0642] Among them, the structure in which the medium outlet 3422 of one partition 33 is connected to the medium inlet 3412 of another partition 33 can be various. The medium outlet 3422 of one partition 33 can be connected to the medium inlet 3412 of another partition 33, or they can be connected through other components, such as connecting pipes, etc., to realize a series structure of multiple partitions 33.

[0643] By connecting the medium outlet 3422 of one partition 33 among the multiple partitions 33 with the medium inlet 3412 of another partition 33, a series structure of multiple partitions 33 is achieved, which facilitates assembly and processing, and can facilitate the injection of fluid medium into the flow channel 30c of the multiple partitions 33 during use.

[0644] In some embodiments, the partition 33 is provided with multiple flow channels 30c. Along the flow direction of the fluid medium in the flow channels 30c of the multiple partitions 33, in two adjacent partitions 33, the number of flow channels 30c of the partition 33 located downstream is greater than the number of flow channels 30c of the partition 33 located upstream.

[0645] Here, along the flow direction of the fluid medium in the flow channels 30c of the plurality of partitions 33, that is, the direction in which the fluid medium flows through the flow channels 30c of the plurality of partitions 33. Among two adjacent partitions 33, the number of flow channels 30c of the downstream partition 33 is greater than the number of flow channels 30c of the upstream partition 33. That is, in the flow direction of the fluid medium, among the two adjacent partitions 33, the partition 33 that the fluid medium passes through first is the upstream partition 33, and the partition 33 that the fluid medium passes through later is the downstream partition 33. In other words, the fluid medium flows from the flow channels 30c of the upstream partition 33 to the flow channels 30c of the downstream partition 33.

[0646] By increasing the number of flow channels 30c of the downstream partition 33 to be greater than the number of flow channels 30c of the upstream partition 33, the heat exchange capacity of the downstream partition 33 can be improved, thereby ensuring that the heat exchange capacities of multiple partitions 33 are balanced with each other, thereby improving the overall thermal management capability, and further effectively alleviating the phenomenon of local temperature rise inside the battery 100.

[0647] In some embodiments, the medium inlets 3412 of the plurality of partitions 33 are in communication with each other, and the medium outlets 3422 of the plurality of partitions 33 are in communication with each other.

[0648] The medium inlets 3412 of the multiple partitions 33 may be directly connected or connected through other components, such as connecting pipes, etc. Similarly, the medium outlets 3422 of the multiple partitions 33 are also connected to realize the parallel structure of the multiple partitions 33.

[0649] By interconnecting the medium inlets 3412 of multiple partitions 33 and the medium outlets 3422 of multiple partitions 33, a parallel structure of multiple partitions 33 is realized. On the one hand, the function of injecting fluid medium into the flow channels 30c of multiple partitions 33 at the same time can be realized. On the other hand, the heat exchange capacity of each partition 33 can be effectively ensured to be balanced, thereby effectively alleviating the phenomenon of local temperature rise inside the battery 100.

[0650] In some embodiments, as shown in FIG. 24 , a partition 335 is provided in the cavity 30 a . The partition 335 is used to separate the cavity 30 a into at least two flow channels 30 c , so as to control the distribution of the fluid medium inside the cavity according to actual needs, so as to reasonably adjust the temperature of the battery cell 20 .

[0651] For example, the plurality of flow channels 30 c may be sequentially arranged along the third direction, each flow channel 30 c extending along the second direction y, and the third direction is perpendicular to the second direction and parallel to the first wall 201 .

[0652] Each flow channel 30c can be independent or interconnected. Only some of the multiple flow channels 30c can contain a fluid medium, or each flow channel 30c can contain a fluid medium. Therefore, the separator 335 divides the interior of the partition 33 into multiple flow channels 30c, facilitating control of the distribution of the fluid medium within the partition 33 according to actual needs, thereby effectively regulating the temperature of the battery cell 20.

[0653] Optionally, the partition 335 is integrally formed with the partition 33, for example, the partition 335 and the partition 33 are formed by a one-piece molding process such as casting or extrusion. The partition 335 and the partition 33 can also be provided separately and then connected to the inner wall of the partition by welding, bonding, clamping, etc.

[0654] Of course, only one flow channel 30c may be formed in the cavity 30a.

[0655] In some embodiments, the separator 33 includes a main plate 331, a cavity 30a is provided inside the main plate 331, and the cavity 30a may have one or more flow channels 30c. The insulating layer 32 includes a first insulating layer 32a, and at least a portion of the first insulating layer 32a is provided between the main plate 331 and the battery cell 20.

[0656] Further, referring to Figures 20 and 21, the partition 33 also includes a manifold 332, the manifold 332 includes a manifold chamber 332a (shown in Figures 26 and 28), the manifold chamber 332a is connected to multiple flow channels 30c, and the insulating layer 32 includes a second insulating layer 32b, at least a portion of the second insulating layer 32b is arranged between the manifold 332 and the battery cell 20 to insulate and isolate the battery cell 20 and the manifold 332.

[0657] “The second insulating layer 32 b covers at least a portion of the outer surface of the busbar 332 ” can be understood as the second insulating layer 32 b partially covers at least a portion of the outer surface of the busbar 332 to insulate and isolate the battery cells 20 from the busbar 332 .

[0658] The two manifolds 332 at both ends of the partition 33 may be respectively a first manifold 341 and a second manifold 342 .

[0659] Only a portion of the second insulating layer 32b may cover at least a portion of the outer surface of the first bus 341, or only a portion of the second insulating layer 32b may cover at least a portion of the outer surface of the second bus 342, or a portion of the second insulating layer 32b may cover at least a portion of the outer surface of the first bus 341 and a portion of the second insulating layer 32b may cover at least a portion of the outer surface of the second bus 342.

[0660] When part of the second insulating layer 32b covers at least part of the surface of the first bus 341, part of the second insulating layer 32b may only cover part of the outer surface of the first bus 341. For example, part of the second insulating layer 32b only covers the outer peripheral surface of the first bus 341, while the two end faces of the first bus 341 along the third direction are not covered by the insulating layer 32. Compared with the case where the insulating layer 32 only covers the main plate 331, the creepage distance between the battery cell 20 and the part of the first bus 341 not covered by the insulating layer 32 can be increased, thereby reducing the risk of short circuit of the battery 100; or part of the insulating layer 32 covers the entire outer surface of the first bus 341.

[0661] In some other embodiments, the insulating layer 32 may not cover the outer surface of the first current bus 341. The first current bus 341 extends along the third direction, and the second current bus 342 extends along the third direction.

[0662] When part of the second insulating layer 32b covers at least part of the surface of the second bus 342, part of the insulating layer 32 may only cover part of the outer surface of the second bus 342. For example, part of the insulating layer 32 only covers the outer peripheral surface of the second bus 342, while the two end faces of the second bus 342 along the third direction are not covered by the second insulating layer 32b. Compared with the case where the insulating layer 32 only covers the main plate 331, the creepage distance between the battery cell 20 and the part of the second bus 342 not covered by the insulating layer 32 can be increased, thereby reducing the risk of short circuit of the battery 100; or part of the second insulating layer 32b covers the entire outer surface of the second bus 342.

[0663] In other embodiments, as shown in FIG. 27 and FIG. 29 , the insulating layer 32 may not cover the outer surface of the second current bus 342 .

[0664] Therefore, the second insulating layer 32b covers at least part of the outer surface of the manifold 332. The second insulating layer 32b can completely cover the outer surface of the manifold 332, or it can only cover the surface of one side of the manifold 332 facing the battery cell 20. The second insulating layer 32b can be used to insulate and isolate the manifold 332 and the battery cell 20, thereby reducing the risk of battery short circuit and improving the safety performance of the battery.

[0665] In this embodiment, the manifold 332 can be located on one side of the battery cell 20. Since the manifold 332 also contains a fluid medium, the manifold 332 can also be used to exchange heat for the battery cell 20. The second insulating layer 32b covers at least part of the outer surface of the manifold 332. The second insulating layer 32b can completely cover the outer surface of the manifold 332, or it can only cover the side surface of the manifold 332 facing the battery cell 20. The second insulating layer 32b can be used to insulate and isolate the manifold 332 and the battery cell 20, thereby reducing the risk of battery short circuit and improving the safety performance of the battery.

[0666] Please refer to Figures 20, 21, 25 and 26. In this embodiment, the two conduit pipes 332 are respectively a first conduit 341 and a second conduit 342; the first conduit 341 is provided with a medium inlet 3412, and a first conduit chamber 3411 connected to the medium inlet 3412 is formed inside the first conduit 341; the second conduit 342 is provided with a medium outlet 3422, and a second conduit chamber 3421 connected to the medium outlet 3422 is formed inside the second conduit 342; the first conduit chamber 3411 and the second conduit chamber 3421 are both connected to each flow channel 30c.

[0667] The medium inlet 3412 is set on the first confluence piece 341, and the medium outlet 3422 is set on the second confluence piece 342. The first confluence chamber 3411 of the first confluence piece 341 and the second confluence chamber 3421 of the second confluence piece 342 are both connected to each flow channel 30c, so that the fluid medium can enter the first confluence chamber 3411 from the medium inlet 3412, and then be distributed to each flow channel 30c through the first confluence chamber 3411. The fluid medium in each flow channel 30c can flow toward the second confluence piece 342 along the second direction Y and converge in the second confluence chamber 3421, and be discharged from the medium outlet 3422.

[0668] In other embodiments, the partition 33 may not be provided with a manifold 332. Instead, each flow channel 30c may be provided with a corresponding medium inlet 3412 and a medium outlet 3422. The fluid medium enters the flow channel 30c through its respective medium inlet 3412 and is discharged from its respective flow channel 30c. This arrangement facilitates independent control of the total amount and flow rate of the fluid medium in each flow channel 30c.

[0669] In this embodiment, the provision of the first conduit 341 facilitates the distribution of the fluid medium to each flow channel 30c, which is beneficial for the uniformity of temperature regulation of the battery cell 20. The provision of the second conduit 342 facilitates the rapid discharge of the fluid medium, thereby improving heat exchange efficiency.

[0670] In some embodiments, as shown in Figures 25 and 26, the thickness of the second insulating layer 32b is h3, the wall thickness of the main plate 331 is h2, and h3 / h2 ≥ 0.00625, so that the creepage distance between the busbar 332 and the battery cell 20 is larger, the safety is higher, thereby reducing the risk of electrical contact between the two in various usage scenarios.

[0671] h3 / h2 can be 0.01, 0.015, 0.1, 0.15, 0.2, 0.25, 0.3, 0.35, 0.4, etc.

[0672] In some embodiments, the insulating layer 32 has a uniform thickness, that is, the thickness h1 of the first insulating layer 30a is equal to the thickness h3 of the second insulating layer 30b, h1 = h3. In other embodiments, the thickness of the first insulating layer is unequal to the thickness of the second insulating layer.

[0673] In some embodiments, please refer to Figures 20, 21, 25-29, the medium inlet 3412 is provided with a first flow guide tube 343, and the medium outlet 3422 is provided with a second flow guide tube 344; the insulating layer 32 also includes a third insulating layer 32c; the third insulating layer 32c partially covers the outer surface of the first flow guide tube 343 to insulate and isolate the battery cell 20 and the first flow guide tube 343; and / or, the third insulating layer 32c partially covers the outer surface of the second flow guide tube 344 to insulate and isolate the battery cell 20 and the second flow guide tube 344.

[0674] Only the medium inlet 3412 may be provided with the first flow conduit 343, or only the medium outlet 3422 may be provided with the second flow conduit 344, or both the medium inlet 3412 and the medium outlet 3422 may be provided with the first flow conduit 343. Figures 20 and 21 illustrate the case where the medium inlet 3412 is provided with the first flow conduit 343 and the medium outlet 3422 is provided with the second flow conduit 344.

[0675] As shown in Figures 20, 21, and 25-29, when the insulating layer 32 partially covers the outer surface of the first flow conduit 343, the insulating layer 32 may only partially cover the outer surface of the first flow conduit 343. For example, the insulating layer 32 may only partially cover the outer circumference of the first flow conduit 343, while the two axial end surfaces of the first flow conduit 343 are not covered by the insulating layer 32. Compared to a case where the insulating layer 32 only covers the main plate 331, the first current collector 341, and the second current collector 342, this can increase the creepage distance between the battery cell 20 and the portion of the first flow conduit 343 not covered by the insulating layer 32, thereby reducing the risk of short circuiting of the battery 100. Alternatively, the insulating layer 32 may partially cover the entire outer surface of the first flow conduit 343. In other embodiments, as shown in Figure 25, the insulating layer 32 may not cover the outer surface of the first flow conduit 343.

[0676] As shown in Figures 20, 21, and 25 to 29, when the insulating layer 32 partially covers the outer surface of the second flow conduit 344, the insulating layer 32 may only cover a portion of the outer surface of the second flow conduit 344. For example, the insulating layer 32 only covers the outer peripheral surface of the second flow conduit 344, while the two axial end surfaces of the second flow conduit 344 are not covered by the insulating layer 32. Compared with the case where the insulating layer 32 only covers the main plate 331, the first bus 341, and the second bus 342, the creepage distance between the battery cell 20 and the portion of the second flow conduit 344 not covered by the insulating layer 32 can be increased, thereby reducing the risk of short circuit of the battery 100; or the insulating layer 32 partially covers the entire outer surface of the second flow conduit 344.

[0677] In other embodiments, the insulating layer 32 may not cover the outer surface of the second flow guiding tube 344 .

[0678] As shown in FIG. 20 , FIG. 21 , and FIG. 25 to FIG. 29 , the first flow conduit 343 and the second flow conduit 344 are coaxially arranged, and the axial directions of the first flow conduit 343 and the second flow conduit 344 are both parallel to the second direction y.

[0679] As shown in Figures 20, 21, and 25-29, one end of the first flow guide tube 343 is inserted into the medium inlet 3412 on the first manifold 341 and welded to the first manifold 341. One end of the second flow guide tube 344 is inserted into the medium outlet 3422 on the second manifold 342 and welded to the second manifold 342.

[0680] The outer circumference of the first flow guide tube 343 is provided with a first stopper 361. The first stopper 361 protrudes radially from the outer circumference of the first flow guide tube 343 and limits the distance the first flow guide tube 343 can be inserted into the first manifold 341. When the first flow guide tube 343 is inserted into the medium inlet 3412 of the first manifold 341, the first stopper 361 abuts against the outer wall of the first manifold 341. The first flow guide tube 343 can be welded to the first manifold 341 via the first stopper 361.

[0681] The outer circumference of the second flow guide tube 344 is provided with a second stopper 371. The second stopper 371 protrudes radially from the outer circumference of the second flow guide tube 344. The second stopper 371 is used to limit the distance the second flow guide tube 344 can be inserted into the second manifold 342. When the second flow guide tube 344 is inserted into the medium outflow outlet of the second manifold 342, the second stopper 371 abuts against the outer wall of the second manifold 342. The second flow guide tube 344 can be welded to the second manifold 342 via the second stopper 371.

[0682] In other embodiments, the medium inlet 3412 may not be provided with the first flow guide pipe 343 , and the medium outlet 3422 may not be provided with the second flow guide pipe 344 .

[0683] The first flow conduit 343 facilitates the entry of fluid into the first conduit chamber 3411 of the first conduit member 341, while the second flow conduit 344 facilitates the discharge of fluid from the second conduit chamber 3421 of the second conduit member 342. The insulating layer 32 partially covers the outer surface of the first flow conduit 343, insulating and isolating the first flow conduit 343 from the battery cell 20, and / or partially covers the outer surface of the second flow conduit 344, insulating and isolating the second flow conduit 344 from the battery cell 20, thereby reducing the risk of short circuits in the battery 100 and improving the safety of the battery 100.

[0684] In some embodiments, along the second direction y, the first busbar 341 and the second busbar 342 are respectively located on both sides of the battery cell 20 , and the third direction is perpendicular to the second direction y.

[0685] The first busbar 341 and the second busbar 342 are respectively located on both sides of the battery cell 20, so that the arrangement direction of the first busbar 341 and the second busbar 342 is staggered with the extension direction of the pole ear of the battery cell 20, so that the first busbar 341 and the second busbar 342 are staggered with the power output pole of the battery cell 20, thereby avoiding the first busbar 341 and the second busbar 342 affecting the charging and discharging of the battery cell 20 or avoiding the first busbar 341 and the second busbar 342 affecting the series connection, parallel connection or mixed connection between each battery cell 20.

[0686] As shown in Figure 20, the main plate 331 extends beyond both ends of the battery cells 20 along the second direction y. A first busbar 341 and a second busbar 342 are respectively connected to both ends of the main plate 331 along the second direction y. Multiple battery cells 20 can be stacked in the second direction y without interfering with the first busbar 341 and the second busbar 342, allowing for a more compact arrangement of the multiple battery cells 20, thereby reducing the volume of the battery 100.

[0687] In some embodiments, the battery cell 20 includes a battery box 21 and an insulating layer (not shown) connected to the outer surface of the battery box 21 , and the insulating layer is used to insulate and isolate the thermal conductor 3 a from the battery box 21 .

[0688] The insulating layer can be a blue film covering the outer surface of the battery case 21 or an insulating coating applied to the outer surface of the battery case 21. The surface of the battery case 21 of the battery cell 20 is connected to the insulating layer. The insulating layer on the battery cell 20 and the insulating layer 32 on the thermal conductive member 3a jointly insulate and isolate the battery cell 20 from the thermal conductive member 3a, further reducing the risk of short circuiting the battery 100.

[0689] In some embodiments, as shown in Figures 52 to 64, the heat conducting member 3a includes a first heat conducting plate 3331, a second heat conducting plate 3332 and a partition 335 that are stacked together. The partition 335 is arranged between the first heat conducting plate 3331 and the second heat conducting plate 3332. The first heat conducting plate 3331 and the partition 335 jointly define a first flow channel 34, and the second heat conducting plate 3332 and the partition 335 jointly define a second flow channel 35.

[0690] When the heat conductor 3a is arranged between two adjacent battery cells 20, the first flow channel 34 and the second flow channel 35 correspond to the two adjacent battery cells 20 respectively. The fluid medium in the first flow channel 34 and the fluid medium in the second flow channel 35 can respectively exchange heat with the two battery cells 20, reducing the temperature difference between the two adjacent battery cells 20. The expansion of one battery cell 20 will not squeeze and reduce the size of the flow channel corresponding to the other battery cell 20 or will have little effect on the size of the flow channel corresponding to the other battery cell 20, thereby ensuring the heat exchange effect of the flow channel corresponding to the other battery cell 20, thereby ensuring the safety performance of the battery 100 using the heat conductor 3a.

[0691] In addition, the first flow channel 34 and the second flow channel 35 correspond to two adjacent battery cells 20 respectively, and can independently withstand the deformation caused by the expansion of their respective corresponding battery cells 20. Therefore, the expansion of one battery cell 20 has little interference with the expansion of another battery cell 20 or will not affect the expansion of another battery cell 20, which is beneficial to the expansion release of the two adjacent battery cells 20, reduces the mutual interference of the expansion of the two adjacent battery cells 20, and causes the battery cell 20 to release pressure prematurely or cause a serious thermal runaway accident, thereby improving the safety performance of the battery 100.

[0692] The first flow channel 34 and the second flow channel 35 are both used to accommodate a fluid medium, and the fluid medium can flow through the first flow channel 34 and the second flow channel 35. The first flow channel 34 and the second flow channel 35 can be independent of each other. The fluid medium in the first flow channel 34 will not flow into the second flow channel 35, and the fluid medium in the second flow channel 35 will not flow into the first flow channel 34.

[0693] Illustratively, along the extension direction of the first flow channel 34, the first flow channel 34 has a first inlet and a first outlet located at both ends of the first flow channel 34, and the fluid medium enters the first flow channel 34 from the first inlet and is discharged from the first flow channel 34 from the first outlet; along the extension direction of the second flow channel 35, the second flow channel 35 has a second inlet and a second outlet located at both ends of the second flow channel 35, and the fluid medium enters the second flow channel 35 from the second inlet and is discharged from the second flow channel 35 from the second outlet.

[0694] The first flow channel 34 and the second flow channel 35 may be communicated with each other, and the fluid medium in the first flow channel 34 may enter the second flow channel 35 or the fluid medium in the second flow channel 35 may enter the first flow channel 34 .

[0695] In an embodiment with only one battery cell 20, the heat conductor 3a is disposed on one side of the battery cell 20 and between the battery cell 20 and the inner wall of the housing 10. The first flow channel 34 is disposed closer to the battery cell 20 than the second flow channel 35, and the second flow channel 35 is disposed closer to the inner wall of the housing 10 than the first flow channel 34.

[0696] In an embodiment where there are multiple battery cells 20 , the multiple battery cells 20 are stacked along a certain direction (a stacking direction of the first heat conducting plate 3331 , the second heat conducting plate 3332 , and the separator 335 , a first direction x).

[0697] As shown in Figures 53 and 54, a thermally conductive member 3a may be provided between two adjacent battery cells 20. For ease of description, the two adjacent battery cells 20 are defined as a first battery cell 21 and a second battery cell 22. The first flow channel 34 and the second flow channel 35 are arranged in the same direction as the stacking direction of the first and second battery cells 21, 22. The first flow channel 34 and the second flow channel 35 are arranged in the same direction as the stacking direction of the first heat conducting plate 3331, the second heat conducting plate 3332, and the separator 335. The first flow channel 34 is provided for the first battery cell 21. The first heat conducting plate 3331 is thermally connected to the first battery cell 21. The fluid medium in the first flow channel 34 is used for heat exchange with the first battery cell 21 to regulate the temperature of the first battery cell 21. The second flow channel 35 is provided for the second battery cell 22. The second heat conducting plate 3332 is thermally connected to the second battery cell 22. The fluid medium in the second flow channel 35 is used for heat exchange with the second battery cell 22 to regulate the temperature of the second battery cell 22.

[0698] A thermally conductive connection means that heat can be transferred between the two. For example, if the first heat conducting plate 3331 is thermally conductively connected to the first battery cell 21, heat can be transferred between the first battery cell 21 and the first heat conducting plate 3331. Heat can be transferred between the fluid medium in the first flow channel 34 and the first battery cell 21 through the first heat conducting plate 3331, thereby achieving heat exchange between the fluid medium in the first flow channel 34 and the first battery cell 21. If the second heat conducting plate 3332 is thermally conductively connected to the second battery cell 22, heat can be transferred between the second battery cell 22 and the second heat conducting plate 3332. Heat can be transferred between the fluid medium in the second flow channel 35 and the second battery cell 22 through the second heat conducting plate 3332, thereby achieving heat exchange between the fluid medium in the second flow channel 35 and the second battery cell 22.

[0699] As shown in Figures 53 and 54, the fluid medium in the first flow channel 34 and the fluid medium in the second flow channel 35 can respectively exchange heat with the two battery cells 20 to reduce the temperature difference between the two adjacent battery cells 20. The expansion of one battery cell 20 will not squeeze and reduce the size of the flow channel corresponding to the other battery cell 20 or will have little effect on the size of the flow channel corresponding to the other battery cell 20, thereby ensuring the heat exchange effect of the flow channel corresponding to the other battery cell 20, thereby ensuring the safety performance of the battery 100 using the heat conductor 3a. For example, the expansion of the battery cell 20 (first battery cell 21) corresponding to the first flow channel 34 will reduce the size of the first flow channel 34 in the stacking direction of the first heat conductor, the second heat conductor and the separator (i.e., the first direction x), but the first battery cell 21 will not affect the size of the second flow channel 35 in the stacking direction of the first heat conductor 3331, the second heat conductor 3332 and the separator 335 or the effect on the size of the second flow channel 35 in the stacking direction of the first heat conductor 3331, the second heat conductor 3332 and the separator 335 is very small, thereby ensuring the heat exchange capacity of the second flow channel 35 to the corresponding battery cell 20 (second battery cell 22). Similarly, the expansion of the battery cell 20 (second battery cell 22) corresponding to the second flow channel 35 will reduce the size of the second flow channel 35 in the stacking direction of the first heat conducting plate 3331, the second heat conducting plate 3332 and the separator 335, but the second battery cell 22 will not affect the size of the first flow channel 34 in the stacking direction of the first heat conducting plate 3331, the second heat conducting plate 3332 and the separator 335 or has little effect on the size of the first flow channel 34 in the stacking direction of the first heat conducting plate 3331, the second heat conducting plate 3332 and the separator 335, thereby ensuring the heat exchange capacity of the first flow channel 34 to the corresponding battery cell 20 (second battery cell 22).

[0700] Because the first flow channel 34 and the second flow channel 35 correspond to two adjacent battery cells 20, respectively, they can independently withstand deformation caused by the expansion of their respective battery cells 20. Consequently, the expansion of one battery cell 20 has little or no effect on the expansion of the other battery cell 20, facilitating the release of the expansion of the two adjacent battery cells 20 and reducing the risk of interference between the expansion of the two adjacent battery cells 20, which could lead to premature pressure relief or severe thermal runaway accidents, further improving the safety of the battery 100. Furthermore, the fluid medium within the first flow channel 34 and the fluid medium within the second flow channel 35 can exchange heat with the two battery cells 20, reducing the temperature difference between the two adjacent battery cells 20 and thus ensuring the safety of the battery 100 using the thermally conductive member 3a.

[0701] The number of the first flow channel 34 can be one or more, and the number of the second flow channel 35 can be one or more. In some embodiments, there are multiple first flow channels 34 and / or there are multiple second flow channels 35.

[0702] There may be multiple first flow channels 34 and one second flow channel 35; there may be one first flow channel 34 and multiple second flow channels 35; or there may be multiple first flow channels 34 and multiple second flow channels 35. In the embodiment where there are multiple first flow channels 34, the first heat conducting plate 3331 and the partition 33 jointly define multiple first flow channels 34, and the multiple first flow channels 34 are arranged in sequence along the third direction, and each first flow channel 34 extends along the second direction y. The third direction is perpendicular to the second direction y. In the embodiment where there are multiple second flow channels 35, the second heat conducting plate 3332 and the partition 33 jointly define multiple second flow channels 35, and the multiple second flow channels 35 are arranged in sequence along the third direction, and each second flow channel 35 extends along the second direction y.

[0703] In other embodiments, the arrangement direction of the plurality of first flow channels 34 and the arrangement direction of the plurality of second flow channels 35 may be different. The extension direction of the first flow channels 34 and the extension direction of the second flow channels 35 may be different. Of course, the extension directions of the plurality of first flow channels 34 and the extension directions of the plurality of second flow channels 35 may be different.

[0704] There are multiple first flow channels 34 and / or multiple second flow channels 35, so that the heat conductor 3a can accommodate more fluid medium and make the fluid medium more evenly distributed, which is beneficial to improving heat exchange efficiency and heat exchange uniformity and reducing temperature differences in different areas of the battery cell 20.

[0705] There are various ways to form the first flow channel 34 . In some embodiments, as shown in FIG. 55 to FIG. 59 , the partition 335 is provided with a first groove 3351 , and the first groove 3351 forms part of the first flow channel 34 .

[0706] The phrase "the portion of the first groove 3351 that forms the first flow channel 34" refers to the portion of the groove wall of the first groove 3351 that serves as the wall of the first flow channel 34. The first groove 3351 can take various forms. For example, as shown in FIG56 , along the stacking direction of the first heat conducting plate 3331, the second heat conducting plate 3332, and the separator 335, the separator 335 has a first surface 3352 facing the first heat conducting plate 3331 and a second surface 3353 facing the second heat conducting plate 3332. The first surface 3352 and the second surface 3353 are arranged opposite each other. The first groove 3351 is provided on the first surface 3352 and is recessed toward the second surface 3353. For another example, as shown in FIG58 , the first groove 3351 is provided on the first surface 3352, recessed from the first surface 3352 toward the second surface 3353, and a first protrusion 3354 is formed on the second surface 3353 at a position corresponding to the first groove 3351.

[0707] The first groove 3351 extends through at least one end of the partition 335 along the second direction y. In this embodiment, the first groove 3351 extends through both ends of the partition 335 along the second direction y, so that the fluid medium can flow into the first flow channel 34 from one end along the second direction y and out from the other end along the second direction y.

[0708] The first groove 3351 provided on the partition 335 forms part of the first flow channel 34 , which reduces the size of the thermal management component 30 along the stacking direction of the first heat conducting plate 3331 , the second heat conducting plate 3332 and the partition 335 while ensuring that the cross-sectional area of ​​the first flow channel 34 is sufficient.

[0709] As shown in FIG. 55 to FIG. 58 , in some embodiments, the first heat conducting plate 3331 blocks the notch of the first groove 3351 facing the first heat conducting plate 3331 to form a first flow channel 34 .

[0710] In some embodiments, the side of the first heat conducting plate 3331 facing the partition 335 abuts against the first surface 3352, so that the first heat conducting plate 3331 blocks the notch of the first groove 3351 facing the first heat conducting plate 3331, thereby forming the first flow channel 34. In other words, the first heat conducting plate 3331 forms another portion of the first flow channel 34. Therefore, in embodiments where the side of the first heat conducting plate 3331 facing the partition 335 abuts against the first surface 3352, the groove wall of the first groove 3351 serves as part of the wall of the first flow channel 34, and the surface of the first heat conducting plate 3331 facing the partition 335 serves as another portion of the wall of the first flow channel 34. The side of the first heat conducting plate 3331 facing the partition 335 is in contact with the first surface 3352, and the surface of the first heat conducting plate 3331 facing the partition 335 is in contact with the first surface 3352, but there is no connection relationship. Alternatively, the surface of the first heat conducting plate 3331 facing the partition 335 is in contact with the first surface 3352 and is connected, such as by welding.

[0711] In other embodiments, the first groove 3351 is not set on the first surface 3352, and there is a gap between the side of the first heat conducting plate 3331 facing the partition 33 and the first surface 3352, then the first groove 3351, the first surface 3352 and the first heat conducting plate 3331 jointly define the first flow channel 34.

[0712] The first heat conducting plate 3331 blocks the notch of the first groove 3351 facing the first heat conducting plate 3331 to form a first flow channel 34, so that the first heat conducting plate 3331 and the partition 335 are arranged more compactly in the stacking direction of the first heat conducting plate 3331, the second heat conducting plate 3332 and the partition 445, thereby reducing the size of the thermal management component 30 along the stacking direction of the first heat conducting plate 3331, the second heat conducting plate 3332 and the partition 445.

[0713] In other embodiments, the first groove 3351 is not set on the first surface 3352 of the partition 335, and there is a gap between the side of the first heat conducting plate 3331 facing the partition 335 and the first surface 3352. The first surface 3352 forms a part of the wall of the first flow channel 34, and the surface of the first heat conducting plate 3331 facing the partition 335 forms another part of the wall of the first flow channel 34.

[0714] There are various ways to form the second flow channel 35 . As shown in FIG. 55 to FIG. 58 , in some embodiments, the partition 33 is provided with a second groove 3355 , and the second groove 3355 forms part of the second flow channel 35 .

[0715] The phrase "the portion of the second groove 3355 that forms the second flow channel 35" refers to the portion of the second groove 3355 wall that serves as the wall of the second flow channel 35. The second groove 3355 can take various forms. For example, as shown in FIG55 , the second groove 3355 is provided on the second surface 3353 along the stacking direction of the first heat conducting plate 3331, the second heat conducting plate 3332, and the separator, and is recessed toward the first surface 3352. For another example, as shown in FIG57 , the second groove 3355 is provided on the second surface 3353, recessed from the second surface 3353 toward the first surface 3352, and a second protrusion 3356 is formed on the first surface 3352 at a position corresponding to the second groove 3355.

[0716] The second groove 3355 passes through at least one end of the partition 335 along the second direction y. In this embodiment, the second groove 3355 passes through both ends of the partition 335 along the second direction y, so that the fluid medium can flow into the second flow channel 35 from one end along the second direction Z and flow out from the other end along the second direction Z.

[0717] The second groove 3355 provided on the partition 335 forms part of the second flow channel 35, which reduces the size of the thermal management component 30 along the stacking direction of the first heat conduction plate 3331, the second heat conduction plate 3332 and the partition 335 while ensuring that the cross-sectional area of ​​the second flow channel 35 is sufficient.

[0718] As shown in FIG. 55 to FIG. 58 , in some embodiments, the second heat conducting plate 3332 blocks the notch of the second groove 3355 facing the second heat conducting plate 3332 to form a second flow channel 35 .

[0719] In some embodiments, the side of the second heat conducting plate 3332 facing the partition 335 abuts against the second surface 3353, so that the second heat conducting plate 3332 blocks the notch of the second groove 3355 facing the second heat conducting plate 3332, thereby forming the second flow channel 35. In other words, the second heat conducting plate 3332 forms another portion of the first flow channel 34. Therefore, in embodiments where the side of the second heat conducting plate 3332 facing the partition 335 abuts against the second surface 3353, the groove wall of the second groove 3355 serves as part of the wall of the second flow channel 35, and the surface of the second heat conducting plate 3332 facing the partition 335 serves as another portion of the wall of the second flow channel 35. The side of the second heat conducting plate 3332 facing the partition 335 is in contact with the second surface 3353, and the surface of the second heat conducting plate 3332 facing the partition 335 may be in contact with the second surface 3353, but there is no connection relationship, or the surface of the second heat conducting plate 3332 facing the partition 335 is in contact with the second surface 3353 and is connected, such as by welding.

[0720] In other embodiments, the second groove 3355 is not provided on the second surface 3353, and there is a gap between the side of the second heat conducting plate 3332 facing the partition 335 and the second surface 3353, then the second groove 3355, the second surface 3353 and the second heat conducting plate 3332 jointly define the second flow channel 35.

[0721] The second heat conducting plate 3332 blocks the notch of the second groove 3355 facing the second heat conducting plate 3332 to form a second flow channel 35, so that the second heat conducting plate 3332 and the partition 335 are arranged more compactly in the stacking direction of the first heat conducting plate 3331, the second heat conducting plate 3332 and the partition, thereby reducing the size of the heat conducting member 3a along the stacking direction of the first heat conducting plate 3331, the second heat conducting plate 3332 and the partition 335.

[0722] 55-58 , in an embodiment in which there are multiple first flow channels 34, there are multiple first grooves 3351, and the multiple first grooves 3351 are arranged along a third direction that is perpendicular to the stacking direction of the first heat conducting plate 3331, the second heat conducting plate 3332, and the separator 335. The first heat conducting plate 3331 blocks the notches of the multiple first grooves 3351 that face the first heat conducting plate 3331, thereby forming multiple first flow channels 34.

[0723] In the embodiment where there are multiple second flow channels 35, there are multiple second grooves 3355, and the multiple second grooves 3355 are arranged along a third direction, which is perpendicular to the stacking direction of the first heat conducting plate 3331, the second heat conducting plate 3332, and the separator 335. The second heat conducting plate 3332 blocks the notches of the multiple second grooves 3355 facing the second heat conducting plate 3332, thereby forming multiple second flow channels 35.

[0724] In which, the separator 335 can be provided with multiple first grooves 3351 only on the first surface 3352, and one second groove 3355 or no second groove 3355 is provided on the second surface 3353; or the separator 335 is provided with multiple second grooves 3355 only on the second surface 3353, and one first groove 3351 or no first groove 3351 is provided on the first surface 3352; or the separator 335 is provided with multiple first grooves 3351 on the first surface 3352 and multiple second grooves 3355 on the second surface 3353.

[0725] There are multiple first grooves 3351, which can form multiple first flow channels 34; and / or there are multiple second grooves 3355, which can form multiple second flow channels 35, so that the heat conductor 3a can accommodate more fluid medium and make the fluid medium more evenly distributed, which is beneficial to improving heat exchange efficiency and heat exchange uniformity and reducing temperature differences in different areas of the battery cell 20.

[0726] 55 to 58 , the first grooves 3351 and the second grooves 3355 are alternately arranged along the third direction.

[0727] “The first grooves 3351 and the second grooves 3355 are alternately arranged in the third direction” means that along the stacking direction of the first heat conducting plate 3331, the second heat conducting plate 3331 and the partition 335, the projection of each second groove 3355 on the first surface 3352 is at least partially located between two adjacent first grooves 3351 along the third direction; and / or, along the stacking direction of the first heat conducting plate 3331, the second heat conducting plate 3331 and the partition 335, the projection of each first groove 3351 on the second surface 3353 is at least partially located between two adjacent second grooves 3355 along the third direction, so that the first flow channel 34 and the second flow channel 35 are alternately arranged in the third direction.

[0728] Figures 55-56 illustrate a situation in which, along the stacking direction of the first heat conducting plate 3331, the second heat conducting plate 3332, and the separator, the projection of each second groove 3355 on the first surface 3352 is entirely located between two adjacent first grooves 3351. Figures 57-58 illustrate a situation in which, along the stacking direction of the first heat conducting plate 3331, the second heat conducting plate 3332, and the separator, a portion of the projection of each second groove 3355 on the first surface 3352 along the third direction is located between two adjacent first grooves 3351, and another portion of the projection of each second groove 3355 on the first surface 3352 along the third direction overlaps with the first groove 3351.

[0729] The first groove 3351 and the second groove 3355 are alternately arranged along the third direction, so that the first flow channel 34 and the second flow channel 35 are alternately arranged along the third direction. When the thermal management component 30 is located between two adjacent battery cells 20, the temperature distribution of the battery cell 20 corresponding to the first flow channel 34 is relatively uniform along the third direction, and the temperature distribution of the battery cell 20 corresponding to the second flow channel 35 is relatively uniform along the third direction.

[0730] 57 to 59 , in some embodiments, the partition 335 is a corrugated plate, which has a simple structure and is easy to manufacture.

[0731] In this embodiment, a first groove 3351 is provided on the first surface 3352, the first groove 3351 is recessed from the first surface 3352 toward the direction close to the second surface 3353, and a first convex portion 3354 is formed at a position of the second surface 3353 corresponding to the first groove 3351; a second groove 3355 is provided on the second surface 3353, the second groove 3355 is recessed from the second surface 3353 toward the direction close to the first surface 3352, and a second convex portion 3356 is formed at a position of the first surface 3352 corresponding to the second groove 3355. The first groove 3351 and the second groove 3355 are alternately arranged along a third direction, and the first convex portion 3354 and the second convex portion 3356 are alternately arranged along the third direction, thereby forming a corrugated plate.

[0732] In other embodiments, the partition 335 may also be a component with other structural forms, as shown in Figures 55 and 56.

[0733] As shown in Figure 60, the first flow channel 34 can also be formed in other forms. For example, in other embodiments, the partition 335 includes a main body 3357 and a first partition 3358, and the two ends of the first partition 3358 along the first direction x are respectively connected to the main body 3357 and the first heat conduction plate 3331, and the main body 3357, the first partition 3358 and the first heat conduction plate 3331 jointly define the first flow channel 34.

[0734] The main body 3357 and the first partition 3358 are both flat plate structures, and a first space is defined between the main body 3357 and the first heat conducting plate 3331. The number of first partitions 3358 can be one or more. In an embodiment where there are multiple first partitions 3358, the multiple first partitions 3358 are arranged at intervals along the first direction Y. The multiple first partitions 3358 divide the first space into multiple first sub-spaces, so that the main body 3357, the first heat conducting plate 3331 and the multiple first partitions 3358 jointly define multiple first flow channels 34. The main body 3357 and the first partition 3358 can be integrally formed, for example, the main body 3357 and the first partition 3358 are formed by an integral molding process such as casting or extrusion. The main body 3357 and the first partition 3358 are separately provided and then connected as a whole by welding, soldering, screw connection, etc.

[0735] The main body 3357, the first partition 3358 and the first heat conducting plate 3331 jointly define a plurality of first flow channels 34, so that the heat conducting member 3a can accommodate more fluid medium and make the fluid medium more evenly distributed, which is beneficial to improving the heat exchange efficiency and heat exchange uniformity, and reducing the temperature difference between different areas of the battery cell 20. The first partition 3358 can support the first heat conducting plate 3331 and enhance the ability of the first heat conducting plate 3331 to resist deformation.

[0736] The second flow channel 35 can also be formed in other forms. For example, please continue to refer to Figure 13. The partition 33 also includes a second partition part 3359. The two ends of the second partition part 3359 along the second direction Z are respectively connected to the main body part 3357 and the second heat conduction plate 3332. The main body part 3357, the second partition part 3359 and the second heat conduction plate 3332 jointly define the second flow channel 35.

[0737] The main body 3357 and the second partition 3359 are both flat-plate structures, and a second space is defined between the main body 3357 and the second heat conducting plate 3332. The number of second partitions 3359 can be one or more. In an embodiment where there are multiple second partitions 3359, the multiple second partitions 3359 are spaced apart along the first direction Y. The multiple second partitions 3359 divide the second space into multiple second subspaces, thereby defining multiple second flow channels 35 together with the main body 3357, the second heat conducting plate 3332, and the multiple second partitions 3359. The main body 3357 and the second partition 3359 can be integrally formed, for example, by a one-piece molding process such as casting or extrusion. The main body 3357 and the second partition 3359 can be provided separately and then connected to form a single unit by welding, soldering, screwing, or the like. Furthermore, the main body 3357, the first partition 3358, and the second partition 3359 can be integrally formed.

[0738] The main body 3357, the second partition 3359 and the second heat conducting plate 3332 jointly define a plurality of second flow channels 35, so that the heat conducting member 3a can accommodate more fluid medium and make the fluid medium more evenly distributed, which is beneficial to improving the heat exchange efficiency and heat exchange uniformity, and reducing the temperature difference between different areas of the battery cell 20. The second partition 3359 can support the first heat conducting plate 3331 and enhance the ability of the second heat conducting plate 3332 to resist deformation.

[0739] The first flow channel 34 and the second flow channel 35 can extend in the same direction or in different directions. In this embodiment, the extending direction of the first flow channel 34 is consistent with the extending direction of the second flow channel 35. The first flow channel 34 and the second flow channel 35 both extend in the second direction y, which facilitates manufacturing.

[0740] For the fluid medium flowing in the first flow channel 34 and the second flow channel 35, the heat exchange capacity between the fluid medium in the first flow channel 34 and the corresponding battery cell 20 gradually weakens along the flow direction of the fluid medium. For example, the heat conductor 3a is used to cool the battery cell 20. Along the flow direction of the fluid medium, the temperature of the fluid medium located in the first flow channel 34 and the second flow channel 35 will gradually increase, and the higher temperature fluid medium will weaken the cooling ability of the battery cell 20.

[0741] Based on the above considerations, in some embodiments, along the extension direction of the first flow channel 34 and the second flow channel 35, the first flow channel 34 has a first inlet (not shown in the figure) and a first outlet (not shown in the figure), and the second flow channel 35 has a second inlet (not shown in the figure) and a second outlet (not shown in the figure), and the direction from the first inlet to the first outlet is opposite to the direction from the second inlet to the second outlet.

[0742] The first inlet allows the fluid medium to enter the first flow channel 34 , and the first outlet allows the fluid medium to exit the first flow channel 34 ; the second inlet allows the fluid medium to enter the second flow channel 35 , and the second outlet allows the fluid medium to exit the second flow channel 35 .

[0743] For example, as shown in Figure 61, in an embodiment where heat conducting members 3a are provided on both sides of the battery cell 20, one side of the battery cell 20 corresponds to the first flow channel 34 of one heat conducting member 3a, and the other side of the battery cell 20 corresponds to the second flow channel 35 of another heat conducting member 3a. Then, the fluid medium on both sides of the battery cell 20 flows in opposite directions, and along the extension direction (second direction y) of the first flow channel 34 and the second flow channel 35, the heat exchange capacity of the fluid medium in the first flow channel 34 and the fluid medium in the second flow channel 35 can complement each other, thereby reducing the difference in local temperature of the battery cell 20.

[0744] Therefore, the direction from the first inlet to the first outlet is opposite to the direction from the second inlet to the second outlet, that is, the flow direction of the fluid medium in the first flow channel 34 is opposite to the flow direction of the fluid medium in the second flow channel 35. The closer the battery cell 20 is to the inlet of the corresponding flow channel, the better the heat exchange effect is, and the closer the battery cell 20 is to the outlet of the corresponding flow channel, the worse the heat exchange effect is. This arrangement of the first flow channel 34 and the second flow channel 35 can reduce the local differences in thermal management of the battery cells 20 in the battery 100, making the heat exchange more uniform.

[0745] As shown in FIG. 62 , in some embodiments, the heat conducting member 3 a includes a connecting cavity 36 located at one end of the partition 335 , the first flow channel 34 is connected to the connecting cavity 36 , and the second flow channel 35 is connected to the connecting cavity 36 .

[0746] The connecting cavity 36 is located at one end of the partition 33. The partition 335, the first heat conducting plate 3331, and the second heat conducting plate 3332 collectively define the connecting cavity 36. In this embodiment, the connecting cavity 36 is a gap located between one end of the partition 335 and the first heat conducting plate 3331 and the second heat conducting plate 3332 in the second direction y.

[0747] In other embodiments, the connecting cavity 36 may also be formed by other structures. For example, the heat conducting member 3a further includes a connecting pipe, and the first flow channel 34 and the second flow channel 35 are connected through the connecting pipe, and the internal channel of the connecting pipe is the connecting cavity 36.

[0748] The number of first flow channels 34 and second flow channels 35 can both be multiple. In an embodiment where there are multiple first flow channels 34, all first flow channels 34 can be connected to the connecting cavity 36. Then, the fluid medium in each first flow channel 34 is discharged from the first outlet of the first flow channel 34, and then enters the second flow channel 35 from the second inlet through the connecting cavity 36. In other embodiments, some of the multiple first flow channels 34 can be connected to the connecting cavity 36, and the fluid medium in these first flow channels 34 enters the second flow channel 35 from the second inlet after passing through the connecting cavity 36. Another part of the multiple first flow channels 34 is not connected to the connecting cavity 36, and the fluid medium in these first flow channels 34 cannot enter the second flow channel 35. The direction indicated by the hollow arrow in Figure 62 is the flow direction of the fluid medium in the first flow channel 34 and the second flow channel 35.

[0749] In embodiments where there are multiple second flow channels 35, all of the second flow channels 35 may be connected to the communication cavity 36. In this case, the fluid medium in the first flow channel 34, after exiting the first flow channel 34 from the first outlet, may then enter each second flow channel 35 from the second inlet through the communication cavity 36. In other embodiments, some of the multiple second flow channels 35 may be connected to the communication cavity 36. The fluid medium in the first flow channel 34 connected to the communication cavity 36 may then enter the second flow channel 35 connected to the communication cavity 36 from the second inlet through the communication cavity 36. Another portion of the multiple second flow channels 35 may not be connected to the communication cavity 36. Therefore, the fluid medium in the first flow channel 34 cannot enter these second flow channels 35.

[0750] In this embodiment, there are plural first flow channels 34 and plural second flow channels 35 , and each first flow channel 34 and each second flow channel 35 is communicated with the communication cavity 36 .

[0751] The number of the first flow channels 34 and the number of the second flow channels 35 may be the same or different.

[0752] The first flow channel 34 is connected to the connecting cavity 36, and the second flow channel 35 is connected to the connecting cavity 36. Then, the fluid medium in the first flow channel 34 can flow into the second flow channel 35, and the fluid medium flowing out of the outlet (first outlet) of the first flow channel 34 flows into the second flow channel 35 from the inlet (second inlet) of the second flow channel 35. This arrangement can reduce the local differences in the thermal management of the battery cells 20 in the battery 100, making the heat exchange more uniform.

[0753] Please refer to Figures 25, 26, 62, and 63. In some embodiments, the heat conductor 3a includes a medium inlet 3412 and a medium outlet 3422. The medium inlet 3412 is connected to the connecting cavity 36 through the first flow channel 34, and the medium outlet 3422 is connected to the connecting cavity 36 through the second flow channel 35.

[0754] The medium inlet 3412 is disposed on the first heat conducting plate 3331 and communicates with the first flow channel 34 . The medium outlet 3422 is disposed on the second heat conducting plate 3332 and communicates with the second flow channel 35 .

[0755] The fluid medium enters the first flow channel 34 through the medium inlet 3412, flows through the connecting cavity 36 into the second flow channel 35, and is discharged through the medium outlet 3422. During the flow, the fluid medium exchanges heat with the battery cells 20. The hollow arrows in Figures 62 and 63 indicate the direction of flow of the fluid medium within the first flow channel 34 and the second flow channel 35.

[0756] The setting of the medium inlet 3412 and the medium outlet 3422 facilitates the fluid medium to enter the first flow channel 34 and the second flow channel 35, and facilitates the fluid medium to be discharged from the first flow channel 34 and the second flow channel 35 after heat exchange with the battery cell 20, so that the fluid medium that has not undergone heat exchange enters the first flow channel 34 and the second flow channel 35, thereby ensuring the heat exchange capacity of the fluid medium in the first flow channel 34 and the second flow channel 35.

[0757] Please refer to Figures 62 and 63. In some embodiments, along the extension direction of the first flow channel 34, the medium inlet 3412 is arranged at the end of the first heat conducting plate 3331 away from the connecting cavity 36; along the extension direction of the second flow channel 35, the medium outlet 3422 is arranged at the end of the second heat conducting plate 3332 away from the connecting cavity 36.

[0758] The extension direction of the first flow channel 34 and the extension direction of the second flow channel 35 are both parallel to the second direction y. In other embodiments, the extension direction of the first flow channel 34 and the extension direction of the second flow channel 35 can be different. For example, the extension direction of the first flow channel 34 is parallel to the second direction y, and the extension direction of the second flow channel 35 is parallel to a predetermined direction, the predetermined direction and the second direction z are at an acute angle, or the predetermined direction is perpendicular to the second direction y, and the predetermined direction is perpendicular to the first direction x.

[0759] A medium inlet 3412 is provided with a medium inlet pipe 37 to facilitate communication between the medium inlet 3412 and a device for supplying fluid medium. A medium outlet 3422 is provided with a medium outlet pipe 38 to facilitate communication between the medium outlet 3422 and a device for recovering fluid medium.

[0760] The medium inlet 3412 is arranged at the end of the first heat conducting plate 3331 away from the connecting cavity 36, and the medium outlet 3422 is arranged at the end of the second heat conducting plate 3332 away from the connecting cavity 36. After the fluid medium enters the first flow channel 34 from the medium inlet 3412, it flows through the entire first flow channel 34 along the extension direction of the first flow channel 34 and enters the second flow channel 35. It flows through the entire second flow channel 35 along the extension direction of the second flow channel 35 and is discharged from the medium outlet 3422, so that the fluid medium has the longest flow path in the thermal management component 30, so as to fully exchange heat with the battery cell 20 and improve the heat exchange efficiency and heat exchange uniformity.

[0761] As shown in FIG. 62 and FIG. 63 , in some embodiments, one end of the first flow channel 34 away from the connecting cavity 36 along its extending direction and one end of the second flow channel 35 away from the connecting cavity 36 along its extending direction are not connected to each other.

[0762] In this embodiment, the extension direction of the first flow channel 34 and the extension direction of the second flow channel 35 are both parallel to the second direction y. The connecting cavity 36 is located at one end of the partition 33 along the second direction y. As shown in Figure 63, the heat conducting member 3a also includes a blocking member 39 (or a blocking member), which is arranged at one end of the partition 335 away from the connecting cavity 36 along the second direction y to block the end of the second flow channel 35 away from the connecting cavity 36 along the second direction y, so as to prevent the fluid medium entering the first flow channel 34 from the medium inlet 3412 from flowing into the second flow channel 35 in the first flow channel 34 in a direction away from the connecting cavity 36. Of course, in other embodiments, the blocking member 39 is arranged at one end of the partition 335 away from the connecting cavity 36 along the second direction y, and can also be used to block one end of the first flow channel 34 away from the connecting cavity 36 along the second direction y to prevent the fluid medium entering the first flow channel 34 from the medium inlet 3412 from flowing into the second flow channel 35 in the first flow channel 34 in a direction away from the connecting cavity 36.

[0763] The sealing member 39 and the partition 335 can be provided as separate parts, and then connected to form an integral structure, for example, by welding, gluing, etc. The sealing member 39 and the partition 335 can also be integrally formed, for example, by a molding process such as casting or stamping.

[0764] Along the stacking direction of the first heat conducting plate 3331 , the second heat conducting plate 3332 and the partition 335 , the projection of the medium outlet 3422 on the partition 353 is located on the side of the sealing member 39 facing the connecting cavity 36 , so that the fluid medium in the second flow channel 35 can be discharged from the medium inlet 3412 .

[0765] One end of the first flow channel 34 away from the connecting cavity 36 along its extension direction is not connected to the other end of the second flow channel 35 away from the connecting cavity 36 along its extension direction. Therefore, after the fluid medium enters the first flow channel 34, it can only flow through the entire first flow channel 34 and then enter the second flow channel 35 from the connecting cavity 36 and flow through the entire second flow channel 35 before being discharged from the medium outlet 3422, so that the fluid medium has the longest flow path in the thermal management component 30, so as to fully exchange heat with the battery cell 20 and improve the heat exchange efficiency and heat exchange uniformity.

[0766] In some embodiments, there are multiple first flow channels 34 and multiple second flow channels 35 , and each first flow channel 34 and each second flow channel 35 is connected to the communication cavity 36 .

[0767] In other embodiments, the number of first flow channels 34 can be one, the number of second flow channels 35 can be multiple, and each second flow channel 35 is connected to the connecting cavity 36; or the number of first flow channels 34 and the number of second flow channels 35 are both one; or the number of second flow channels 35 can be one, the number of first flow channels 34 can be multiple, and each first flow channel 34 is connected to the connecting cavity 36.

[0768] The first flow channel 34 and the second flow channel 35 are both connected by multiple and uniform connecting cavities 36. The fluid medium of each first flow channel 34 can flow into each second flow channel 35, and the fluid medium flowing out of the outlet of the first flow channel 34 flows into the second flow channel 35 from the inlet of the second flow channel 35. This arrangement can reduce the local differences in thermal management of the battery cells 20 in the battery 100, making the heat exchange more uniform.

[0769] In embodiments where there are multiple first flow channels 34 , the number of medium inlets 3412 may be set differently. For example, referring to FIG. 53 and FIG. 63 , in some embodiments, there is only one medium inlet 3412 , and each first flow channel 34 connects the connecting cavity 36 and the medium inlet 3412 .

[0770] In an embodiment where the sealing member 39 blocks the end of the second flow channel 35 away from the communication cavity 36, as shown in FIG63 , a diversion gap 310 is formed between the side of the sealing member 39 facing away from the communication cavity 36 and the first heat conducting plate 3331 and the second heat conducting plate 3332. The medium inlet 3412 communicates with each first flow channel 34 through the diversion gap 310. The fluid medium flowing in through the medium inlet 3412 enters the diversion gap 310 and is then distributed to each first flow channel 34 from the diversion gap 310.

[0771] Therefore, there is only one medium inlet 3412, which facilitates the simultaneous flow of fluid medium into each first flow channel 34. Furthermore, the number of medium inlets 3412 provided on the first heat conducting plate 3331 is relatively small, which reduces the impact of the provision of the medium inlets 3412 on the structural strength of the first heat conducting plate 3331. This also makes the structure of the structural heat conducting member 3a simpler and easier to manufacture.

[0772] In other embodiments, there are multiple medium inlets 3412 , and each first flow channel 34 is connected to the communication cavity 36 and one medium inlet 3412 .

[0773] The number of medium inlets 3412 is the same as the number of first flow channels 34, and they correspond one to one. Each medium inlet 3412 allows fluid medium to flow into the corresponding first flow channel 34, facilitating independent control of fluid medium entry into each first flow channel 34 and controlling fluid medium entry into the desired first flow channel 34 as needed. This, in turn, controls the distribution of the fluid medium within the heat regulating tube, thereby effectively regulating the temperature of the battery cell 20.

[0774] In an embodiment where there are multiple second flow channels 35 , as shown in FIG. 52 , there are multiple medium outlets 3422 , and each second flow channel 35 is connected to the communication cavity 36 and one medium outlet 3422 .

[0775] There are multiple second flow channels 35 and multiple medium outlets 3422 . The medium outlets 3422 and the second flow channels 35 are arranged in a one-to-one correspondence, and the fluid medium in each second flow channel 35 is discharged from the corresponding medium outlet 3422 .

[0776] In other embodiments, there may be only one medium outlet 3422 , which is in communication with each second flow channel 35 , and the fluid medium in all second flow channels 35 is discharged from the medium outlet 3422 .

[0777] Each second flow channel 35 is connected to the communication cavity 36 and a medium outlet 3422, so that the fluid medium can be discharged from the second flow channel 35 more quickly, thereby improving the heat exchange efficiency.

[0778] In some embodiments, the divider 335 is an integrally formed structure.

[0779] The separator 335 can be formed by an integral molding method such as stamping or casting. In the embodiment where the separator 335 is a corrugated plate, the corrugated plate is formed by stamping. The separator 335 is an integrally molded structure, which is easy to manufacture and has good structural strength.

[0780] In some embodiments, the first heat conducting plate 3331 may be an integrally formed structure, and the second heat conducting plate 3332 may be an integrally formed structure, for example, the first heat conducting plate 3331 and the second heat conducting plate 3332 are both cast or stamped.

[0781] In some embodiments, the first heat conducting plate 3331 is welded to the partition 335 , and / or the second heat conducting plate 3332 is welded to the partition 335 .

[0782] The first heat conducting plate 3331 and the separator 335 may be welded, and the second heat conducting plate 3332 and the separator 335 may be connected by other means (such as bonding), or the second heat conducting plate 3332 and the separator 335 may be in contact with each other without being connected. Alternatively, the second heat conducting plate 3332 and the separator 335 may be welded, and the first heat conducting plate 3331 and the separator 335 may be connected by other means (such as bonding), or the first heat conducting plate 3331 and the separator 335 may be in contact with each other without being connected. In this embodiment, both the first heat conducting plate 3331 and the second heat conducting plate 3332 are welded to the separator 335.

[0783] In the embodiment where the partition plate 335 is a corrugated plate, the first heat conducting plate 3331 is welded to the second protrusion 3356, and the second heat conducting plate 3332 is welded to the first protrusion 3354 (please refer to Figure 58). This connection method enables the partition 335 to support the first heat conducting plate 3331 and the second heat conducting plate 3332, thereby improving the ability of the first heat conducting plate 3331 and the second heat conducting plate 3332 to resist the expansion and deformation of the battery cell 20.

[0784] The first heat conducting plate 3331 and the separator 335 are connected by welding, so that the connection stability of the first heat conducting plate 3331 and the separator 335 is better; the second heat conducting plate 3332 and the separator 335 are connected by welding, so that the connection stability of the second heat conducting plate 3332 and the separator 335 is better.

[0785] As shown in Figure 64, the battery 100 includes an adjacent first battery cell 21, a second battery cell 22 and a heat conductor 3a, the heat conductor 3a is arranged between the first battery cell 21 and the second battery cell 22, the first heat conductor plate 3331 is thermally connected to the first battery cell 21, and the second heat conductor plate 3332 is thermally connected to the second battery cell 22.

[0786] The fluid medium in the first flow channel 34 and the fluid medium in the second flow channel 35 can respectively exchange heat with the first battery cell 21 and the second battery cell 22 to reduce the temperature difference between the first battery cell 21 and the second battery cell 22 .

[0787] The expansion of the first battery cell 21 will not squeeze and reduce the size of the second flow channel 35 corresponding to the second battery cell 22 or will have little effect on the size of the second flow channel 35 corresponding to the second battery cell, thereby ensuring the heat exchange capacity of the second flow channel 35 corresponding to the second battery cell 22; the expansion of the second battery cell 22 will not squeeze and reduce the size of the first flow channel 34 corresponding to the first battery cell 21 or will have little effect on the size of the first flow channel 34 corresponding to the first battery cell, thereby ensuring the heat exchange capacity of the first flow channel 34 corresponding to the first battery cell 21, thereby ensuring the safety performance of the battery 100 using the heat conductor 3a.

[0788] In addition, the first flow channel 34 and the second flow channel 35 correspond to the first battery cell 21 and the second battery cell 22 respectively. Therefore, the first flow channel 34 can withstand the deformation caused by the expansion of the first battery cell 21, and the second flow channel 35 can withstand the deformation caused by the expansion of the second battery cell 22. Therefore, the expansion of the first battery cell 21 has little interference with the expansion of the second battery cell 22 or will not affect the expansion of the second battery cell 22, and the expansion of the second battery cell 22 has little interference with the expansion of the first battery cell 21 or will not affect the expansion of the first battery cell 21, which is conducive to the expansion release of the first battery cell 21 and the second battery cell 22, reduces the mutual interference of the expansion of the first battery cell 21 and the second battery cell 22, which may cause the first battery cell 21 and the second battery cell 22 to release pressure in advance or cause serious thermal runaway accidents, and further improves the safety performance of the battery 100.

[0789] 64 , in some embodiments, a heat conducting member 3 a may be provided on the side of the first battery cell 21 facing away from the second battery cell 22 , and a reinforcing member 30 may be provided on the side of the second battery cell 22 facing away from the first battery cell 21 .

[0790] For the convenience of description, the heat conductive member 3a located between the first battery cell 21 and the second battery cell 22 is defined as the first heat conductive member, the heat conductive member 3a located on the side of the first battery cell 21 away from the second battery cell 22 is defined as the second heat conductive member, and the heat conductive member 3a located on the side of the second battery cell 22 away from the first battery cell 21 is defined as the third heat conductive member.

[0791] The fluid medium in the first flow channel 34 of the first heat conducting member and the fluid medium in the second flow channel 35 flow in opposite directions. The fluid medium in the first flow channel 34 of the second heat conducting member and the fluid medium in the second flow channel 35 flow in opposite directions. The fluid medium in the first flow channel 34 of the third heat conducting member and the fluid medium in the second flow channel 35 flow in opposite directions.

[0792] The second heat conducting plate 3332 of the second heat conducting member is thermally connected to the side of the first battery cell 21 facing away from the second battery cell 22. The flow direction of the fluid medium in the first flow channel 34 of the first heat conducting member is opposite to the flow direction of the second flow channel 35 of the second heat conducting member 3a. In this way, the heat exchange capabilities of the fluid medium on both sides of the first battery cell 21 along the second direction y can complement each other, thereby reducing local temperature differences in the first battery cell 21.

[0793] The first heat conducting plate 3331 of the third heat conducting member is thermally connected to the side of the second battery cell 22 facing away from the first battery cell. The flow direction of the fluid medium in the second flow channel 35 of the first heat conducting member is opposite to the flow direction of the first flow channel 34 of the third heat conducting member. In this way, the heat exchange capabilities of the fluid medium on both sides of the second battery cell 22 along the second direction y can complement each other, thereby reducing the local temperature difference of the second battery cell 22.

[0794] In some embodiments, as shown in Figures 65-82, at least a portion of the heat conductor 3a is configured to be deformable when under pressure, so that the heat conductor 3a provides a certain expansion space for the battery cell 20, which is conducive to reducing the extrusion force between the heat conductor 3a and the battery cell 20.

[0795] In some embodiments, as shown in Figure 65, the heat conductor 3a includes a stacked heat exchange layer 400 and a compressible layer 500. The heat exchange layer 400 can improve the heat exchange efficiency of the battery cell 20 and improve the heat dissipation capacity of the battery cell 20. The elastic modulus of the compressible layer 500 is smaller than the elastic modulus of the heat exchange layer 400. After being subjected to the expansion force released by the battery cell 20, the compressible layer 500 can be deformed along the direction of the expansion force of the battery cell 20, thereby absorbing the expanded part of the battery cell 20, ensuring the expansion space of the battery cell 20, and avoiding large deformation of the entire battery 100. In addition, the compressible layer 500 is conducive to absorbing tolerances when assembling the battery, facilitating installation and maintaining the compact structure of the battery.

[0796] The heat exchange layer 400 is a layered structure used to exchange heat with the battery cells 20. When the temperature of the battery cells 20 is higher than that of the heat exchange layer 400, the heat from the battery cells 20 is transferred to the heat exchange layer 400, causing the temperature of the battery cells 20 to drop. When the temperature of the battery cells 20 is lower than the heat exchange temperature, the heat from the heat exchange layer 400 is transferred to the battery cells 20, causing the temperature of the battery cells 20 to rise.

[0797] The compressible layer 500 is a layered structure that undergoes a large compression deformation after being subjected to an applied force.

[0798] Optionally, when the compressible layer 500 is subjected to a force along the stacking direction, the compressible layer 500 may be compressed along the stacking direction and generate a large deformation.

[0799] The elastic modulus is the proportional relationship between stress and strain in a material or structure during its elastic deformation phase. Under the same stress conditions, the greater the elastic modulus, the smaller the material or structure's deformability; the smaller the elastic modulus, the greater the material or structure's deformability.

[0800] The number of layers of the heat exchange layer 400 can be one or more layers, and the number of layers of the compressible layer 500 can also be one or more layers.

[0801] As an example, as shown in Figure 66, the heat conductor 3a includes a heat exchange layer 400 and a compressible layer 500; as shown in Figure 67, the heat conductor 3a includes two heat exchange layers 400 and a compressible layer 500, and the compressible layer 500 is arranged between the two heat exchange layers 400; as shown in Figure 68, the heat conductor 3a includes a heat exchange layer 400 and two compressible layers 500, and the heat exchange layer 400 is arranged between the two compressible layers 500.

[0802] In some embodiments, the compressible layer 500 includes a compressible cavity 501 , which is a cavity whose volume decreases when the compressible layer 500 is subjected to a force.

[0803] After receiving the expansion force released by the battery cell 20 , the gas in the compressible cavity 501 is compressed, so that the compressible layer 500 is deformed along the direction of the expansion force of the battery cell 20 .

[0804] In some embodiments, the compressible cavity 501 is filled with a phase change material or an elastic material.

[0805] Phase change materials (PCMs) are substances that change state and generate latent heat while maintaining constant temperature. The process of changing physical properties is called a phase change, during which the PCM absorbs or releases large amounts of latent heat.

[0806] Elastic materials refer to materials with a low elastic modulus, and elastic materials can undergo significant deformation under the expansion force of battery cells.

[0807] When the compressible cavity 501 is filled with phase change material, the thermal capacity of the battery can be increased, so that the heat conductor 3a can keep the battery cell 20 warm or absorb the heat of the battery cell 20; when the compressible cavity 501 is filled with elastic material, the elastic material has good elasticity. After being subjected to the expansion force released by the battery cell, the elastic material is compressed so that the compressible layer 500 is deformed along the direction of the expansion force of the battery cell 20, and rebounds after the expansion force disappears. In addition, the elastic material can also increase the supporting strength of the compressible layer 500.

[0808] Optionally, the elastic material comprises a rubber material.

[0809] In some embodiments, the heat exchange layer 400 includes a heat exchange cavity 401 (also referred to as the cavity 30a described above) for accommodating a heat exchange medium. The heat exchange medium is a medium used to exchange heat with the battery cells, and is generally a liquid with a large specific heat capacity and fluidity at the battery operating temperature.

[0810] Optionally, the heat exchange chamber 401 can be sealed or open

[0811] In some embodiments, as shown in FIG69 , a first support member 410 (also referred to as the reinforcing rib described above) is provided in the heat exchange cavity 401. The first support member 410 is a structure that supports the heat exchange cavity 401 to prevent deformation of the heat exchange cavity 401 due to compression. The first support member 410 can be used to increase the strength of the heat exchange layer 400, thereby preventing significant deformation of the heat exchange layer 400 after being subjected to the expansion force released by the battery cells.

[0812] Optionally, the elastic modulus of the first support member 410 is greater than the elastic modulus of the compressible layer 500 .

[0813] Since the elastic modulus of the compressible layer 500 is smaller than that of the first support member 410, it is more likely to deform. After the heat conductive member 3a is subjected to the expansion force released by the battery cell, the compressible layer 500 can produce a large deformation along the direction of the expansion force of the battery cell 20, while the heat exchange layer 400 basically does not deform.

[0814] In some embodiments, the heat exchange layer 400 and the compressible layer 500 are stacked along a first direction, and the first support member 410 is supported in the heat exchange cavity 401 along the first direction x.

[0815] When the heat conductor 3a is applied to the battery, the battery cell 20 is generally made to abut against the heat conductor 3a along the first direction x. The subsequent expansion force released by the battery cell 20 is also basically along the first direction x. The first support member 410 supported in the heat exchange cavity 401 along the first direction x can greatly increase the elastic modulus of the heat exchange layer 400, so that after the heat conductor 3a is subjected to the expansion force released by the battery cell along the first direction x, the compressible layer 500 can produce a large deformation along the first direction x, while the heat exchange layer 400 basically does not produce any deformation.

[0816] In some embodiments, referring to FIG. 67 , a compressible layer 500 is disposed in the heat exchange cavity 401 .

[0817] Both ends of the heat conducting member 3a along the stacking direction are heat exchange cavities 401, which can effectively improve the heat exchange efficiency of the battery cells at both ends of the heat conducting member 3a, so that the temperature of the entire battery is maintained at a low level.

[0818] In some embodiments, as shown in FIG70 , a first connection structure 420 (also referred to as the first reinforcing rib described above) for fixing the compressible layer 500 in the heat exchange cavity 401 is further provided in the heat exchange cavity 401 .

[0819] The first connection structure 420 is a structure whose two ends are respectively connected to the inner wall of the heat exchange chamber 401 and the outer wall of the compressible layer 500. The first connection structure 420 can fix the compressible layer 500 to prevent the compressible layer 500 from changing its position relative to the heat exchange chamber 401.

[0820] Optionally, at least a portion of the first connection structure 420 is disposed along the stacking direction within the heat exchange cavity 401. The first connection structure 420 can secure the compressible layer 500 and enhance the strength of the heat exchange layer 400, thereby preventing significant deformation of the heat exchange layer 400 due to the expansion force released by the battery cells.

[0821] In some embodiments, a heat exchange space is defined between the outer wall of the compressible layer 500 and the inner wall of the heat exchange cavity 401 , and the first connecting structure 420 is disposed in the heat exchange space and divides the heat exchange space into flow channels 402 (also referred to as flow channels 30c ).

[0822] The multiple flow channels 402 facilitate the circulation of the heat exchange medium in the heat exchange space, thereby preventing the temperature of the local heat conducting element 3a from being too high.

[0823] Optionally, a plurality of first connection structures 420 are provided in the heat exchange cavity 401 .

[0824] Optionally, the elastic modulus of the first connection structure 420 is greater than the elastic modulus of the compressible layer 500 .

[0825] In some embodiments, referring to Figures 71-74, the compressible layer 500 includes a first compressible tube 510, the heat exchange layer 400 includes a first heat exchange tube 430, and the first compressible tube 510 is sleeved in the first heat exchange tube 430.

[0826] The first compressible tube 510 is a tubular structure having a compressible cavity 501 therein and capable of being squeezed and deformed.

[0827] The first heat exchange tube 430 is a tubular structure having a heat exchange cavity 401 therein, and a tubular structure having at least one first connection structure 420 is provided in the heat exchange cavity 410. The end of at least one first connection structure 420 defines a first installation cavity 431 for providing a first compressible tube 510.

[0828] The heat conducting member 3a of the present application is formed by the first compressible tube 510 and the first heat exchange tube 430 being nested, which is beneficial to the molding of the heat conducting member 3a.

[0829] Optionally, after the first compressible tube 510 and the first heat exchange tube 430 are sleeved, an end of at least one first connection structure 420 in the first heat exchange tube 430 abuts against an outer wall of the first compressible tube 510 .

[0830] Optionally, the heat conductor 3a has a third direction z corresponding to the height direction of the battery cell after being installed in the battery, and two first connection structures 420 extending along the third direction z are provided in the first heat exchange tube 430, and the two first connection structures 420 are respectively provided at both ends of the first heat exchange tube 430 along the third direction z.

[0831] Optionally, the first heat exchange tube 430 has two opposing first abutment surfaces 432 for abutting the larger surface of the battery cell, i.e., the first wall 201. The first abutment surfaces 432 can increase the contact area between the first heat exchange tube 430 and the battery cell, thereby improving the heat transfer capability of the heat conductor 3a with the battery cell.

[0832] Optionally, the first compressible tube 510 has two opposing first mating surfaces 511 for mating with the larger surface of the battery cell, i.e., the first wall 201. The battery cell generally expands and deforms perpendicularly to the larger surface. The first mating surfaces 511 can deform under the expansion force of the battery cell, thereby absorbing the expanded portion of the battery cell.

[0833] In some embodiments, optionally, referring to FIG. 68 , the heat exchange layer 400 is disposed in the compressible cavity 501 .

[0834] Both ends of the heat conductor 3a along the stacking direction are heat exchange cavities 401, which can effectively improve the deformation ability of the heat conductor 3a, so that after being subjected to the expansion force released by the battery cells at both ends along the stacking direction, the heat conductor 3a can produce better deformation to absorb the expanded part released by the battery cells.

[0835] In some embodiments, the compressible layer 500 includes thermally conductive walls that define a compressible cavity 501 .

[0836] The heat-conducting wall is a wall structure of the compressible layer 500 that has a good heat-conducting effect.

[0837] As an example, the material of the heat-conducting wall may be heat-conducting silicone, metal, etc.

[0838] The outer wall of the compressible layer 500 is a heat-conducting wall, thereby effectively transferring the heat of the battery cells to the internal heat exchange layer 400 for heat exchange.

[0839] In some embodiments, please refer to Figures 75-78. Figure 75 is a schematic diagram of the structure of the second heat exchange tube in some embodiments of the present application. Figure 76 is a schematic diagram of the structure of the second compressible tube in some embodiments of the present application. Figure 77 is a side view of the second compressible tube in some embodiments of the present application. Figure 78 is a schematic diagram of the structure of the second compressible tube and the second heat exchange tube after assembly in some embodiments of the present application. The compressible layer 500 includes a second compressible tube 520, and the heat exchange layer 400 includes a second heat exchange tube 440. The second heat exchange tube 440 is sleeved within the second compressible tube 520.

[0840] The second heat exchange tube 440 is a tubular structure having a heat exchange cavity 401 therein.

[0841] The second compressible tube 520 is a tubular structure having a compressible cavity 501 therein, and the compressible cavity 501 is provided with at least one second connecting structure 530. The end of the at least one second connecting structure 530 defines a second installation cavity 521 for setting the second heat exchange tube 440.

[0842] The heat conducting member 3a of the present application is formed by the second compressible tube 520 and the second heat exchange tube 440 being nested, which is beneficial to the molding of the heat conducting member 3a.

[0843] Optionally, after the second compressible tube 520 and the second heat exchange tube 440 are sleeved, an end of at least one second connecting structure 530 in the second compressible tube 520 abuts against an outer wall of the second heat exchange tube 440 .

[0844] Optionally, the heat conductor 3a has a third direction z corresponding to the height direction of the battery cell after being installed in the battery, and two second connecting structures 530 extending along the third direction z are provided in the second compressible tube 520, and the two second connecting structures 530 are respectively provided at both ends of the second compressible tube 520 along the third direction z.

[0845] Optionally, the second compressible tube 520 has two opposing second mating surfaces 522 for contacting the larger surface, i.e., the first wall 201, of the battery cell 20. The second mating surfaces 522 can increase the contact area between the second compressible tube 520 and the battery cell 20, thereby improving the heat transfer capability of the thermal conductor 3a with the battery cell 20. Furthermore, since the battery cell 20 generally expands and deforms perpendicular to the larger surface, the second mating surfaces 522 can deform under the expansion force of the battery cell 20, thereby absorbing the expansion of the battery cell 20.

[0846] Optionally, the second heat exchange tube 440 has two opposing second abutting surfaces 441 for mating with the first wall 201, the larger surface of the battery cell 20. The two second abutting surfaces 441 correspond to the two second mating surfaces 522 and absorb heat conducted from the two second mating surfaces 522.

[0847] Optionally, a plurality of second support members 450 are disposed inside the second heat exchange tube 440 .

[0848] The inner wall of the heat exchange cavity 401 defines a heat exchange space. The plurality of second support members 450 are disposed in the heat exchange space and divide the heat exchange space into a plurality of flow channels 402 .

[0849] Optionally, the elastic modulus of the second support member 450 is greater than the elastic modulus of the compressible layer 500 .

[0850] In some embodiments, referring to Figures 65, 79 and 80, the heat conducting member 3a further includes a current collecting element 106, the current collecting element 106 includes a liquid flow cavity 1061, the liquid flow cavity 1061 is connec...

Claims

1. A battery, wherein: include: A box body, the box body having a receiving cavity, the receiving cavity comprising a top wall and a bottom wall arranged opposite to each other in a vertical direction; A battery cell, the battery cell is accommodated in the accommodation cavity, the battery cell includes an electrode assembly and an electrode terminal, the electrode assembly is electrically connected to the electrode terminal, the battery cell is fixed to the accommodation cavity and the electrode terminal faces the bottom wall of the accommodation cavity, the battery cell includes a first wall, and the first wall is the wall with the largest area in the battery cell; A heat-conducting member for accommodating a heat exchange medium is disposed in the accommodating cavity, the heat-conducting member is disposed opposite to the first wall and is heat-conductingly connected to the first wall, and the heat exchange medium exchanges heat with the battery cell through the heat-conducting member.

2. The battery according to claim 1, wherein The battery cell further includes a second wall connected to the first wall, the first wall and the second wall are arranged to intersect, and the electrode terminal is arranged on the second wall.

3. The battery according to claim 2, wherein The battery cell comprises two first walls and two second walls which are arranged opposite to each other, and at least two electrode terminals are provided; At least two of the electrode terminals are disposed on the same second wall; or, each of the second walls is disposed with at least one of the electrode terminals.

4. The battery according to claim 1, wherein The electrode terminal is disposed on the first wall.

5. The battery according to claim 4, wherein There are multiple battery cells and they are arranged in a first direction. In the first direction, each battery cell is provided with a first surface opposite to the first wall, and the first surface is provided with an avoidance groove. The avoidance groove of one of the two adjacent battery cells is used to accommodate the electrode terminal of the other battery cell, and the first direction is perpendicular to the first wall.

6. The battery according to claim 1, wherein The first wall is formed in a cylindrical shape.

7. The battery according to claim 6, wherein Second walls are disposed at both axial ends of the first wall, and at least one of the second walls is provided with the electrode terminal.

8. The battery according to claim 7, wherein One of the second walls is provided with an exposed electrode terminal, and the electrode assembly includes a positive electrode sheet and a negative electrode sheet, one of the positive electrode sheet and the negative electrode sheet is electrically connected to the electrode terminal, and the other of the positive electrode sheet and the negative electrode sheet is electrically connected to the first wall or the other of the second walls.

9. The battery according to claim 1, wherein At least one of the battery cells is a soft pack battery cell.

10. The battery according to any one of claims 1 to 9, wherein The battery cell further includes a pressure relief mechanism, and the pressure relief mechanism and the electrode terminal are disposed on the same wall of the battery cell.

11. The battery according to any one of claims 1 to 9, wherein The battery cell further includes a pressure relief mechanism, and the pressure relief mechanism and the electrode terminal are respectively disposed on two walls of the battery cell.

12. The battery according to any one of claims 1 to 11, wherein The heat conducting member is bonded to the first wall via a first adhesive layer.

13. The battery according to claim 12, wherein: The bottom of the heat conducting member is bonded to the bottom wall of the accommodating cavity via a second adhesive layer; and / or The bottom of the battery cell is bonded to the bottom wall of the accommodating cavity through a third adhesive layer.

14. The battery according to claim 13, wherein The thickness of the first adhesive layer is less than or equal to the thickness of the second adhesive layer; and / or The thickness of the first adhesive layer is less than or equal to the thickness of the third adhesive layer.

15. The battery according to claim 13 or 14, wherein The thermal conductivity of the first adhesive layer is greater than or equal to the thermal conductivity of the second adhesive layer; and / or The thermal conductivity of the first adhesive layer is greater than or equal to the thermal conductivity of the third adhesive layer.

16. The battery according to any one of claims 13 to 15, wherein: The ratio between the thickness of the first adhesive layer and the thermal conductivity of the first adhesive layer is a first ratio; the ratio between the thickness of the second adhesive layer and the thermal conductivity of the second adhesive layer is a second ratio; the ratio between the thickness of the third adhesive layer and the thermal conductivity of the third adhesive layer is a third ratio; wherein the first ratio is less than or equal to the second ratio; and / or The first ratio is less than or equal to the third ratio.

17. The battery according to any one of claims 1 to 16, wherein The heat conducting element comprises metal material and / or non-metal material.

18. The battery according to claim 17, wherein The heat conducting member comprises a metal plate and an insulating layer, and the insulating layer is arranged on the surface of the metal plate; or The heat conducting member is a non-metallic material plate.

19. The battery according to any one of claims 1 to 18, wherein The battery cells are multiple and arranged along the second direction; The heat conductive member includes a partition extending along the second direction and connected to the first wall of each of the plurality of battery cells, the second direction being parallel to the first wall.

20. The battery according to claim 19, wherein The heat conducting member further includes an insulating layer, and the insulating layer is used for insulating and isolating the first wall of the battery cell and the separator.

21. The battery according to claim 20, wherein The thermal conductivity of the insulating layer is greater than or equal to 0.1 W / (m·K).

22. The battery according to any one of claims 19 to 21, wherein The dimension T1 of the partition in a first direction is less than 0.5 mm, and the first direction is perpendicular to the first wall.

23. The battery according to any one of claims 19 to 21, wherein The dimension T1 of the partition in a first direction is greater than 5 mm, and the first direction is perpendicular to the first wall.

24. The battery according to claim 19, wherein The surface of the heat conducting member connected to the first wall is an insulating surface; Wherein, the dimension of the heat conducting member in a first direction is 0.1-100 mm, and the first direction is perpendicular to the first wall.

25. The battery according to any one of claims 19 to 24, wherein In the third direction, a size H1 of the partition and a size H2 of the first wall satisfy: 0.1≤H1 / H2≤2, and the third direction is perpendicular to the second direction and parallel to the first wall.

26. The battery according to any one of claims 19 to 25, wherein A cavity is arranged inside the partition.

27. The battery according to claim 26, wherein The cavity is used to accommodate a heat exchange medium to adjust the temperature of the battery cell.

28. The battery according to claim 26 or 27, wherein In the first direction, the size of the cavity is W, the capacity Q of the battery cell and the size W of the cavity satisfy: 1.0 Ah / mm≤Q / W≤400 Ah / mm, and the first direction is perpendicular to the first wall.

29. The battery according to claim 27 or 28, wherein The partition further includes a pair of heat conducting plates arranged opposite to each other along a first direction, the cavity is arranged between the pair of heat conducting plates, and the first direction is perpendicular to the first wall.

30. The battery according to claim 29, wherein The partition plate further includes reinforcing ribs, and the reinforcing ribs are arranged between the pair of heat conducting plates.

31. The battery according to claim 30, wherein The reinforcing rib is connected to at least one of the pair of heat conducting plates.

32. The battery according to claim 31, wherein The reinforcing ribs include first reinforcing ribs, two ends of the first reinforcing ribs are respectively connected to the pair of heat conducting plates, and the first reinforcing ribs are arranged obliquely relative to the first direction.

33. The battery according to claim 32, wherein The included angle between the first reinforcing rib and the first direction is in the range of 30°-60°.

34. The battery according to claim 32 or 33, wherein The reinforcing rib further includes a second reinforcing rib, one end of the second reinforcing rib is connected to one of the pair of heat conducting plates, and the other end of the second reinforcing rib is spaced apart from the other of the pair of heat conducting plates.

35. The battery according to claim 34, wherein The second reinforcing rib extends along the first direction and protrudes from one of the pair of heat conducting plates.

36. The battery according to claim 34 or 35, wherein The first reinforcing rib and the second reinforcing rib are arranged at intervals.

37. A battery according to any one of claims 29 to 36, wherein In the first direction, a thickness D of the heat conducting plate and a size W of the cavity satisfy: 0.01≤D / W≤25.

38. The battery according to any one of claims 27 to 37, wherein The partition is provided with a medium inlet and a medium outlet, the cavity is connected with the medium inlet and the medium outlet, and a cavity disconnected from the medium inlet and the medium outlet is provided inside the partition.

39. The battery according to any one of claims 27-38, wherein A partition is provided in the cavity, and the partition is used to divide the cavity into at least two flow channels.

40. The battery according to claim 39, wherein: The heat conducting member includes a first heat conducting plate, a second heat conducting plate and the separator which are stacked, the separator is arranged between the first heat conducting plate and the second heat conducting plate, the first heat conducting plate and the separator jointly define a first flow channel, and the second heat conducting plate and the separator jointly define a second flow channel.

41. The battery according to any one of claims 1 to 40, wherein At least a portion of the thermally conductive member is configured to be deformable when subjected to pressure.

42. The battery according to claim 41, wherein The heat conducting member comprises: A stacked arrangement of heat exchange layers and compressible layers; The elastic modulus of the compressible layer is smaller than the elastic modulus of the heat exchange layer.

43. The battery according to claim 42, wherein The compressible layer includes a compressible cavity filled with a phase change material or an elastic material.

44. The battery according to claim 41, wherein The heat conducting member comprises a shell and a supporting component, wherein the supporting component is accommodated in the shell and is used to define a cavity and a deformation cavity which are separated and arranged in the shell, wherein the cavity is used for heat exchange medium to flow, and the deformation cavity is configured to be deformable when the shell is under pressure.

45. The battery according to claim 41, wherein The heat conducting member comprises a shell and an isolation assembly, wherein the isolation assembly is accommodated in the shell and connected to the shell to form a cavity between the shell and the isolation assembly, wherein the cavity is used for heat exchange medium to flow, and the isolation assembly is configured to be deformable when the shell is under pressure.

46. ​​The battery according to any one of claims 1 to 40, wherein The heat conducting member is provided with an avoidance structure, and the avoidance structure is used to provide space for the expansion of the battery cell.

47. The battery according to claim 46, wherein The battery cells are arranged in plurality, and at least a portion of the avoidance structure is located between two adjacent battery cells and is used to provide space for expansion of at least one of the battery cells.

48. A battery according to claim 46 or 47, wherein In the first direction, the heat conducting member includes a first heat conducting plate and a second heat conducting plate arranged opposite to each other, a cavity is provided between the first heat conducting plate and the second heat conducting plate, the cavity is used to accommodate a heat exchange medium, along the first direction, at least one of the first heat conducting plate and the second heat conducting plate is recessed in a direction close to the other to form the avoidance structure, and the first direction is perpendicular to the first wall.

49. The battery according to any one of claims 1 to 48, wherein The box body is provided with battery packs, the number of which is more than two and arranged along a first direction, each of which includes more than two battery cells arranged along a second direction, the second direction is perpendicular to the first direction, and the first direction is perpendicular to the first wall.

50. The battery according to claim 49, wherein The heat conducting member is sandwiched between two adjacent battery groups.

51. The battery according to claim 50, wherein It also includes a connecting pipe group, wherein a cavity for accommodating a heat exchange medium is provided in the heat conducting member, and the connecting pipe group is used to connect the cavities of two or more heat conducting members.

52. The battery according to claim 51, wherein The connecting pipe group includes a connecting channel, an inlet pipe and an outlet pipe. Along the first direction, the cavities of two adjacent heat-conducting components are connected through the connecting channel, and the inlet pipe and the outlet pipe are connected to the cavity of the same heat-conducting component.

53. The battery according to any one of claims 1 to 52, wherein The box body comprises a main body and a bottom cover arranged at the bottom of the main body, and the bottom cover is sealedly connected to the main body and together forms the closed accommodating cavity.

54. The battery according to claim 53, wherein A wall of the bottom cover facing the battery cell constitutes the bottom wall of the accommodation cavity.

55. A battery according to claim 53 or 54, wherein The bottom cover is detachably connected to the bottom of the main body.

56. A battery according to any one of claims 53-55, wherein The bottom cover has a characteristic surface facing the accommodating cavity, and the characteristic surface is configured as a plane.

57. The battery according to any one of claims 1 to 56, wherein A bearing member is arranged on the top of the box body, and the battery monomer is arranged on the surface of the bearing member.

58. A battery according to claim 57, wherein The wall of the carrier facing the battery constitutes the top wall of the accommodating cavity.

59. The battery according to claim 57 or 58, wherein The minimum thickness H of the carrier and the weight M1 of the battery satisfy: 0.0002 mm / kg<H / M1≤0.2 mm / kg.

60. The battery according to any one of claims 57-59, wherein The supporting member is used to define the accommodating cavity, and the battery cell is suspended on the supporting member.

61. The battery according to claim 60, wherein The battery cell is bonded to the carrier.

62. The battery according to any one of claims 57-61, wherein An outer surface of the battery cell facing the carrier is a first outer surface, and the electrode terminal is arranged on an outer surface of the battery cell except the first outer surface.

63. The battery according to claim 62, wherein The battery cell has a second outer surface disposed opposite to the first outer surface, and the electrode terminal is arranged on the second outer surface.

64. The battery according to any one of claims 57-63, wherein There are a plurality of battery cells, and the plurality of battery cells are arranged in a second direction, and the second direction is perpendicular to the vertical direction; The carrier is connected to the top walls of the plurality of battery cells, the battery cells are located below the carrier, and the relationship between the dimension N of the carrier in the vertical direction and the weight M2 of the battery cells satisfies: 0.04mm / kg≤N / M2≤100mm / kg.

65. The battery according to claim 64, wherein A cavity is arranged inside the bearing component.

66. The battery according to claim 65, wherein The cavity is used to accommodate a heat exchange medium to adjust the temperature of the battery cell.

67. The battery according to any one of claims 57-66, wherein In the vertical direction, a surface of the carrier away from the battery cell is provided with reinforcing ribs.

68. The battery according to any one of claims 57-67, wherein The carrier has a carrier surface facing the accommodating cavity, and the carrier surface is configured as a plane.

69. The battery according to claim 68, wherein The bearing member comprises a bearing portion and a connecting portion, wherein the connecting portion is enclosed and connected to the edge of the bearing portion, the bearing portion is used to define the accommodating cavity, and the connecting portion is connected to the portion of the box body other than the bearing member; Wherein, the inner surface of the bearing portion facing the accommodating cavity forms the bearing surface.

70. The battery according to claim 69, wherein The bearing portion is disposed to protrude in a direction away from the accommodating cavity compared to the connecting portion.

71. The battery according to any one of claims 57-70, wherein The box body includes a bottom cover and a frame, the frame encloses an enclosed space that is set through at both ends in the vertical direction, the bottom cover and the supporting member are respectively covered at opposite ends of the enclosed space in the vertical direction, and the bottom cover, the frame and the supporting member together enclose the accommodating cavity.

72. The battery of any one of claims 1-71, wherein The battery cell is placed upside down in the box with the end cover facing the bottom wall. The end cover is provided with a pressure relief mechanism and the electrode terminal. Both the pressure relief mechanism and the electrode terminal are arranged facing the bottom wall.

73. The battery of any one of claims 1-72, wherein The battery also includes a connecting plate and a connector. The connecting plate is arranged on one side of the box body and protrudes in the horizontal direction. The connecting plate and the bottom wall form a receiving portion in the vertical direction. The connector is arranged in the receiving portion and connected to the connecting plate. The connector is electrically connected to the battery cell.

74. The battery of any one of claims 1-73, wherein The battery further includes a protection component, which is disposed between the battery cell and the bottom wall to support and carry the battery cell.

75. The battery of claim 74, wherein The battery further includes a busbar component for electrically connecting to the electrode terminals of at least two battery cells. The protection component is disposed between the bottom wall and the busbar component, and is used to insulate the battery cells from the bottom wall.

76. A battery according to claim 74 or 75, wherein The protection assembly includes a protection bar, and the protection bar abuts against the battery cell.

77. The battery of claim 76, wherein The protection strip is fixedly connected to the battery cell and / or the box body.

78. The battery of claim 77, wherein The protection strip is bonded to the battery cell and / or the box.

79. The battery of any one of claims 76-78, wherein A plurality of the protection bars are provided, and the plurality of the protection bars are spaced apart in the second direction and extend along the first direction. The first direction and the second direction are perpendicular to the vertical direction in pairs.

80. The battery of any one of claims 76-79, wherein The protection component also includes a main board, the protection strip is connected to the main board, and the main board is located between the protection strip and the bottom wall.

81. The battery of claim 80, wherein The main board abuts against the bottom wall.

82. The battery of claim 81, wherein The main board is fixedly connected to the bottom wall.

83. The battery of any one of claims 80-82, wherein The main board and the protection strip are integrally formed or detachably connected.

84. The battery of any one of claims 76-83, wherein The end cover of the battery cell includes a functional area and a shoulder, the functional area is provided with the electrode terminal, the shoulders are located on both sides of the functional area along a second direction, the battery cell abuts against the protective strip through the shoulders, and the second direction is perpendicular to the vertical direction.

85. The battery of any one of claims 76-84, wherein In the vertical direction, a thickness of the protection bar is greater than an extension height of a portion of the electrode terminal exposed from the battery cell.

86. The battery of any one of claims 76-85, wherein The protection strip abuts against the electrode terminal, or the protection strip is spaced apart from the electrode terminal.

87. The battery of any one of claims 79-86, wherein The orthographic projection of the electrode terminal on the bottom wall is located between the orthographic projections of adjacent protection strips on the bottom wall.

88. The battery of any one of claims 79-87, wherein The electrode terminals of two adjacent battery cells are electrically connected via a busbar component. In the first direction, an extension length of one of the two adjacent protection strips is smaller than an extension length of the other to form an avoidance gap for avoiding the busbar component.

89. The battery of any one of claims 79-88, wherein The battery cell further includes a pressure relief mechanism, which is disposed on the same side as the electrode terminal, and the orthographic projection of the pressure relief mechanism on the bottom wall is located between the orthographic projections of adjacent protection strips on the bottom wall.

90. The battery of any one of claims 72-89, wherein In the vertical direction, there is a first distance H3 between the end cover and the bottom wall of the battery cell, and the first distance H3 satisfies 2mm<H3<30mm.

91. The battery of claim 90, wherein A ratio H3 / M2 of the first distance H3 to a weight M2 of a single battery cell satisfies 0.2 mm / Kg<H3 / M2<50 mm / Kg.

92. The battery of any one of claims 1-91, wherein The battery cell further includes a battery box, the electrode assembly is accommodated in the battery box, and the battery box is provided with a pressure relief mechanism, which is integrally formed with the battery box.

93. The battery of claim 92, wherein: The battery box includes an integrally formed non-weak area and a weak area. The battery box is provided with a groove portion. The non-weak area is formed around the groove portion, and the weak area is formed at the bottom of the groove portion. The weak area is configured to be destroyed when the battery cell releases internal pressure, and the pressure relief mechanism includes the weak area.

94. The battery of claim 93, wherein: The average grain size of the weak area is S1, and the average grain size of the non-weak area is S2, satisfying: 0.05≤S1 / S2≤0.

9.

95. The battery of claim 94, wherein The minimum thickness of the weak area is A1, satisfying: 1≤A1 / S1≤100.

96. The battery of any one of claims 93-95, wherein The minimum thickness of the weak zone is A1, and the hardness of the weak zone is B1, satisfying: 5HBW / mm≤B1 / A1≤10000HBW / mm.

97. The battery of any one of claims 93-96, wherein The hardness of the weak area is B1, and the hardness of the non-weak area is B2, satisfying: 1<B1 / B2≤5.

98. The battery of any one of claims 93-97, wherein The minimum thickness of the weak area is A1, and the minimum thickness of the non-weak area is A2, satisfying: 0.05≤A1 / A2≤0.

95.

99. The battery of any one of claims 1-98, wherein The electrode assembly includes a positive electrode sheet and a negative electrode sheet, the positive electrode sheet and / or the negative electrode sheet includes a current collector and an active material layer, the current collector includes a supporting layer and a conductive layer, the supporting layer is used to support the conductive layer, and the conductive layer is used to support the active material layer.

100. The battery of claim 99, wherein Along the thickness direction of the support layer, the conductive layer is disposed on at least one side of the support layer.

101. The battery according to claim 99 or 100, wherein The room temperature film resistance R of the conductive layer S Satisfy: 0.016Ω / □≤R S ≤420Ω / □.

102. The battery of any one of claims 99-101, wherein The material of the conductive layer is selected from at least one of aluminum, copper, titanium, silver, nickel-copper alloy, and aluminum-zirconium alloy.

103. The battery of any one of claims 99-102, wherein The material of the support layer includes one or more of polymer materials and polymer-based composite materials.

104. The battery of any one of claims 99-103, wherein The thickness d1 of the support layer and the light transmittance k of the support layer satisfy: When 12μm≤d1≤30μm, 30%≤k≤80%; or, When 8μm≤d1<12μm, 40%≤k≤90%; or, When 1μm≤d1<8μm, 50%≤k≤98%.

105. The battery of any one of claims 1-104, wherein The electrode assembly comprises a positive electrode sheet, the positive electrode sheet comprises a positive electrode current collector and a positive electrode active material layer coated on the surface of the positive electrode current collector, the positive electrode active material layer comprises a positive electrode active material, the positive electrode active material has a core and a shell covering the core, the core comprises at least one of a ternary material, dLi2MnO3·(1-d)LiMO2 and LiMPO4, 0<d<1, the M comprises one or more selected from Fe, Ni, Co, Mn, The shell contains a crystalline inorganic substance, wherein the full width at half maximum of a main peak of the crystalline inorganic substance measured by X-ray diffraction is 0-3°, and the crystalline inorganic substance includes one or more selected from metal oxides and inorganic salts.

106. The battery of claim 105, wherein The shell includes at least one of the metal oxide and the inorganic salt, and carbon.

107. The battery of any one of claims 1-106, wherein The electrode assembly includes a positive electrode sheet, the positive electrode sheet includes a positive electrode current collector and a positive electrode active material layer coated on the surface of the positive electrode current collector, the positive electrode active material layer includes a positive electrode active material, the positive electrode active material includes LiMPO4, the M includes Mn and non-Mn elements, and the non-Mn elements meet at least one of the following conditions: The ionic radius of the non-Mn element is a, the ionic radius of the manganese element is b, and |ab| / b is not greater than 10%; The valence change voltage of the non-Mn element is U,2V <U<5.5V; The chemical activity of the chemical bond formed by the non-Mn element and O is not less than the chemical activity of the PO bond; The maximum valence of the non-Mn element is not greater than 6.

108. The battery of claim 107, wherein The non-Mn element includes one or both of a first doping element and a second doping element, wherein the first doping element is manganese doping and the second doping element is phosphorus doping.

109. The battery according to claim 108, wherein The first doping element satisfies at least one of the following conditions: The ionic radius of the first doping element is a, the ionic radius of the manganese element is b, and |ab| / b is not greater than 10%; The valence change voltage of the first doping element is U,2V <U<5.5V。 110. The battery according to claim 109, wherein The second doping element satisfies at least one of the following conditions: The chemical activity of the chemical bond formed by the second doping element and O is not less than the chemical activity of the PO bond; The maximum valence of the second doping element is no more than 6.

111. The battery according to any one of claims 107-110, wherein The positive electrode active material further has a coating layer.

112. The battery according to claim 111, wherein The coating layer includes carbon.

113. The battery according to claim 112, wherein The carbon in the coating layer is a mixture of SP2 carbon and SP3 carbon.

114. The battery according to claim 113, wherein The molar ratio of the SP2 carbon to the SP3 carbon is any value within the range of 0.1-10.

115. An electrical device, wherein: Comprising a battery according to any one of claims 1-114, the battery is used to provide electrical energy.

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