Battery and electric device

Abstract

The invention discloses a battery and a power utilization device, the battery comprises a box body, a battery monomer and a heat conduction part used for accommodating a heat exchange medium, the box body is provided with an accommodating cavity, the battery monomer is accommodated in the accommodating cavity, an electrode assembly of the battery monomer is electrically connected with an electrode terminal, the battery monomer comprises a first wall, the first wall is a wall with the largest area in the battery monomer, and the first wall is a second wall. The heat conduction part is arranged in the accommodating cavity and is in heat conduction connection with the first wall, and the heat exchange medium exchanges heat with the battery monomers through the heat conduction part to adjust the temperature of the battery monomers. According to the battery provided by the invention, heat conduction in the battery can be effectively guaranteed, so that the heat management performance of the battery can be improved.

Description

[0001] This application is a divisional application of the invention patent application with the application date of January 3, 2023, application number 202380008509.8, and name “Battery and Electrical Device”.

[0002] CROSS-REFERENCE TO RELATED APPLICATIONS

[0003] This application is based on international patent application number PCT / CN2022 / 077152, filed on February 21, 2022, international patent application number PCT / CN2022 / 077153, filed on February 21, 2022, international patent application number PCT / CN2022 / 077151, filed on February 21, 2022, international patent application number PCT / CN2022 / 077147, filed on February 21, 2022 Patent application, international patent application with application number PCT / CN2022 / 077149 and application date on February 21, 2022, international patent application with application number PCT / CN2022 / 077150 and application date on February 21, 2022, international patent application with application number PCT / CN2022 / 098447 and application date on June 13, 2022, international patent application with application number PCT / CN2022 / 098727 and application date on June 14, 2022 Patent application, international patent application number PCT / CN2022 / 099229, application date June 16, 2022, international patent application number PCT / CN2022 / 100488, application date June 22, 2022, international patent application number PCT / CN2022 / 100486, application date June 22, 2022, international patent application number PCT / CN2022 / 111347, application date August 10, 2022 Application, international patent application with application number PCT / CN2022 / 099786 and application date June 20, 2022, international patent application with application number PCT / CN2022 / 101392 and application date June 27, 2022, and international patent application with application number PCT / CN2022 / 101395 and application date June 27, 2022, and claim priority of the above-mentioned international patent applications. The entire contents of the above-mentioned international patent applications are hereby introduced into this application as a reference. Technical Field

[0004] The present application relates to battery technology, and in particular to a battery and an electrical device. Background Art

[0005] In recent years, new energy vehicles have developed by leaps and bounds. In the field of electric vehicles, power batteries, as the power source of electric vehicles, play an irreplaceable and important role.

[0006] Battery energy density is a key performance parameter. However, improving battery energy density also requires consideration of thermal management. Therefore, improving thermal management is a pressing technical challenge in battery technology. Summary of the Invention

[0007] The present application aims to solve at least one of the technical problems existing in the related art. To this end, the present application proposes a battery that can effectively ensure heat conduction in the battery, thereby improving the thermal management performance of the battery.

[0008] The present application also provides an electrical device having the battery.

[0009] According to the battery of the embodiment of the first aspect of the present application, the battery includes: a box body, the box body has a accommodating cavity; a battery cell, the battery cell is accommodated in the accommodating 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 includes a first wall, 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 thermally connected to the first wall, the heat exchange medium is heat-exchanged with the battery cell through the heat conductor to adjust the temperature of the battery cell.

[0010] According to the battery of the embodiment of the present application, a heat conductive member is provided for accommodating a heat exchange medium, and the heat conductive member is thermally connected to the first wall of the battery cell, so that the heat conductive member is effectively utilized 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.

[0011] 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.

[0012] 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.

[0013] In some embodiments, the electrode terminal is provided on the first wall.

[0014] 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.

[0015] In some embodiments, the first wall is formed into a cylindrical shape.

[0016] 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.

[0017] 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.

[0018] In some embodiments, at least one of the battery cells is a pouch battery cell.

[0019] 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.

[0020] 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.

[0021] In some embodiments, the heat conducting member is bonded to the first wall via a first adhesive layer.

[0022] 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.

[0023] 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.

[0024] 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.

[0025] 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.

[0026] In some embodiments, the heat conducting member includes a metal material and / or a non-metal material.

[0027] 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.

[0028] 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.

[0029] 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.

[0030] In some embodiments, the thermal conductivity of the insulating layer is greater than or equal to 0.1 W / (m·K).

[0031] 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.

[0032] 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.

[0033] 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 mm to 100 mm, and the first direction is perpendicular to the first wall.

[0034] 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.

[0035] In some embodiments, a cavity is provided inside the partition.

[0036] In some embodiments, the cavity is used to accommodate a heat exchange medium to adjust the temperature of the battery cell.

[0037] 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.

[0038] 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.

[0039] In some embodiments, the partition further includes reinforcing ribs, and the reinforcing ribs are arranged between the pair of heat conducting plates.

[0040] In some embodiments, the reinforcing rib is connected to at least one of the pair of heat conducting plates.

[0041] 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.

[0042] In some embodiments, the angle between the first reinforcing rib and the first direction is in the range of 30°-60°.

[0043] 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.

[0044] In some embodiments, the second reinforcing rib extends along the first direction and protrudes from one of the pair of heat conducting plates.

[0045] In some embodiments, the first reinforcing rib and the second reinforcing rib are spaced apart.

[0046] 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.

[0047] 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.

[0048] 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.

[0049] 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.

[0050] In some embodiments, at least a portion of the thermally conductive member is configured to deform when compressed.

[0051] 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.

[0052] In some embodiments, the compressible layer includes a compressible cavity filled with a phase change material or an elastic material.

[0053] 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.

[0054] 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.

[0055] 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.

[0056] 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.

[0057] 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.

[0058] 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.

[0059] In some embodiments, the heat conductive member is sandwiched between two adjacent battery groups.

[0060] 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.

[0061] 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.

[0062] 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.

[0063] 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.

[0064] 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.

[0065] In some embodiments, the minimum thickness of the weak area is A1, satisfying: 1≤A1 / S1≤100.

[0066] 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.

[0067] 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.

[0068] 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.

[0069] 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.

[0070] 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.

[0071] In some embodiments, the room temperature thin film resistance R S Satisfies: 0.016Ω / □≤R S ≤420Ω / □.

[0072] 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.

[0073] In some embodiments, the material of the support layer includes one or more polymer materials and polymer-based composite materials.

[0074] 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%.

[0075] 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 main peak of the crystalline inorganic substance measured using X-ray diffraction has a half-maximum width of 0-3°, and the crystalline inorganic substance includes one or more selected from metal oxides and inorganic salts.

[0076] In some embodiments, the shell includes at least one of the metal oxide and the inorganic salt, and carbon.

[0077] 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 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.

[0078] 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 manganese-site doping, and the second doping element is a phosphorus-site doping.

[0079] 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 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.

[0080] 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.

[0081] In some embodiments, the positive electrode active material further has a coating layer.

[0082] In some embodiments, the coating layer includes carbon.

[0083] In some embodiments, the carbon in the coating layer is a mixture of SP2-form carbon and SP3-form carbon.

[0084] 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.

[0085] According to the electrical device of the second aspect embodiment of the present application, it includes the battery according to the first aspect embodiment of the present application above, and the battery is used to provide electrical energy.

[0086] The additional aspects and advantages of the present application will be partly given in the following description, partly become obvious from the following description, or be understood through the practice of the present application. Description of the Drawings

[0087] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the following description of the embodiments with reference to the accompanying drawings, in which:

[0088] Figure 1 is a schematic diagram of an electrical device according to an embodiment of the present application;

[0089] Figure 2 is an exploded view of a battery according to one embodiment of the present application;

[0090] Figure 3 is an exploded view of a battery according to another embodiment of the present application;

[0091] Figure 4 is an exploded view of a battery cell according to one embodiment of the present application;

[0092] Figure 5 yes Figure 4 A schematic diagram of a battery cell shown in ;

[0093] Figure 6 is a schematic diagram of the arrangement of battery cells according to another embodiment of the present application;

[0094] Figure 7 is an exploded view of a battery according to one embodiment of the present application;

[0095] Figure 8 yes Figure 7 Schematic diagram of the arrangement of battery cells shown in ;

[0096] Figure 9 is a schematic diagram of a battery cell according to one embodiment of the present application;

[0097] Figure 10 is a schematic diagram of a battery according to one embodiment of the present application;

[0098] Figure 11 yes Figure 10 Schematic diagram of the heat conducting member shown in ;

[0099] Figure 12 yes Figure 10 Schematic diagram of a heat conducting member and a plurality of battery cells shown in ;

[0100] Figure 13 yes Figure 10 Another schematic diagram of the battery shown in;

[0101] Figure 14 This is a partial structural diagram of a battery according to an embodiment of the present application;

[0102] Figure 15 yes Figure 14 Another schematic diagram of the battery shown in;

[0103] Figure 16 yes Figure 14 Schematic diagram of the arrangement of battery cells shown in ;

[0104] Figure 17 is a partial structural diagram of a battery according to one embodiment of the present application;

[0105] Figure 18 yes Figure 17 Another schematic diagram of the battery shown in;

[0106] Figure 19 yes Figure 17 Another schematic diagram of the battery shown in;

[0107] Figure 20 is a schematic diagram of a partial structure of a battery according to one embodiment of the present application;

[0108] Figure 21 yes Figure 20 Schematic diagram of the thermal management components shown in ;

[0109] Figure 22 yes Figure 21 a cross-sectional view of a thermal management component shown in ;

[0110] Figure 23 yes Figure 22 An enlarged view of the circled section A;

[0111] Figure 24 is a cross-sectional view of a heat conducting member with a separator provided therein according to one embodiment of the present application;

[0112] Figure 25 yes Figure 22 An enlarged view of the circled section B;

[0113] Figure 26 yes Figure 22 An enlarged view of the circled section C;

[0114] Figure 27 is a cross-sectional view of a heat conducting member according to one embodiment of the present application;

[0115] Figure 28 yes Figure 27 An enlarged view of the circled portion D;

[0116] Figure 29 yes Figure 27 An enlarged view of the circled section E;

[0117] Figure 30 is a partial structural diagram of a battery according to one embodiment of the present application;

[0118] Figure 31 yes Figure 30 A partial cross-sectional view of the battery shown in ;

[0119] Figure 32 yes Figure 31 An enlarged view of the circled section F;

[0120] Figure 33 Schematic diagrams of various structures of partitions according to some embodiments of the present application;

[0121] Figure 34 is an exploded view of a battery according to one embodiment of the present application;

[0122] Figure 35 This is a schematic diagram of a battery according to an embodiment of the present application.

[0123] Figure 36 yes Figure 35 Schematic diagram of the connection between the battery cell and the thermal management component shown in;

[0124] Figure 37 yes Figure 36 Cross-sectional view along AA direction;

[0125] Figure 38 yes Figure 37 An enlarged view of the G section circled in the middle;

[0126] Figure 39 is a schematic diagram of a battery according to one embodiment of the present application;

[0127] Figure 40 is an exploded view of a battery according to one embodiment of the present application;

[0128] Figure 41 is an exploded view of a battery according to one embodiment of the present application;

[0129] Figure 42 is a schematic diagram of a battery according to one embodiment of the present application;

[0130] Figure 43 yes Figure 42 Another schematic diagram of the battery shown;

[0131] Figure 44 yes Figure 42 Another schematic diagram of the battery shown;

[0132] Figure 45 yes Figure 44 Cross-section along the BB direction;

[0133] Figure 46 is a schematic diagram of a battery according to one embodiment of the present application;

[0134] Figure 47 yes Figure 46 A schematic diagram of a heat conducting member is shown;

[0135] Figure 48 yes Figure 47 A cross-sectional view of the main body plate shown in ;

[0136] Figure 49 yes Figure 47 Another cross-sectional view of the main body panel shown in ;

[0137] Figure 50 is a cross-sectional view of a main body plate according to one embodiment of the present application;

[0138] Figure 51 is a cross-sectional view of a main body plate according to one embodiment of the present application;

[0139] Figure 52 is a schematic diagram of a heat conducting member according to one embodiment of the present application;

[0140] Figure 53 is a cross-sectional view of a heat conducting member according to one embodiment of the present application;

[0141] Figure 54 yes Figure 53 Another cross-sectional view of the heat conducting member in FIG.

[0142] Figure 55 is a cross-sectional view of a separator according to one embodiment of the present application;

[0143] Figure 56 is a cross-sectional view of a heat conducting member according to one embodiment of the present application;

[0144] Figure 57 is a cross-sectional view of a separator according to one embodiment of the present application;

[0145] Figure 58 is a cross-sectional view of a heat conducting member according to one embodiment of the present application;

[0146] Figure 59 is a schematic diagram of a separator according to one embodiment of the present application;

[0147] Figure 60 is a cross-sectional view of a heat conducting member according to one embodiment of the present application;

[0148] Figure 61 is a cross-sectional view of a battery according to one embodiment of the present application;

[0149] Figure 62 is a cross-sectional view of a battery according to one embodiment of the present application;

[0150] Figure 63 is a cross-sectional view of a battery according to one embodiment of the present application;

[0151] Figure 64 is a cross-sectional view of a battery according to one embodiment of the present application;

[0152] Figure 65 is a schematic diagram of a heat conducting member according to one embodiment of the present application;

[0153] Figure 66 is a cross-sectional view of a heat conducting member according to one embodiment of the present application;

[0154] Figure 67 is a cross-sectional view of a heat conducting member according to one embodiment of the present application;

[0155] Figure 68 is a cross-sectional view of a heat conducting member according to one embodiment of the present application;

[0156] Figure 69 is a cross-sectional view of a heat conducting member according to one embodiment of the present application;

[0157] Figure 70 is a cross-sectional view of a heat conducting member according to one embodiment of the present application;

[0158] Figure 71 is a schematic diagram of a compressible chamber according to one embodiment of the present application;

[0159] Figure 72 is a partial schematic diagram of a heat conducting member according to one embodiment of the present application;

[0160] Figure 73 yes Figure 72 Another schematic diagram of the heat conducting member shown in ;

[0161] Figure 74 is a schematic diagram of a heat conducting member according to one embodiment of the present application;

[0162] Figure 75 is a schematic diagram of a heat conducting member according to one embodiment of the present application;

[0163] Figure 76 is a schematic diagram of a heat conducting member according to one embodiment of the present application;

[0164] Figure 77 is a schematic diagram of a heat conducting member according to one embodiment of the present application;

[0165] Figure 78 is a schematic diagram of a heat conducting member according to one embodiment of the present application;

[0166] Figure 79 is an exploded view of a heat conducting member according to one embodiment of the present application;

[0167] Figure 80 yes Figure 79Schematic diagram of the current collecting element shown in;

[0168] Figure 81 is a schematic diagram of a battery according to one embodiment of the present application;

[0169] Figure 82 is a schematic diagram of a heat conducting member according to one embodiment of the present application;

[0170] Figure 83 is a schematic diagram of a heat conducting member according to one embodiment of the present application;

[0171] Figure 84 yes Figure 83 An enlarged view of the H section circled in the middle;

[0172] Figure 85 is a schematic diagram of a battery according to one embodiment of the present application;

[0173] Figure 86 is a schematic diagram of a heat conducting member according to one embodiment of the present application;

[0174] Figure 87 yes Figure 86 Another schematic diagram of the heat conducting member shown in ;

[0175] Figure 88 is a schematic diagram of a heat conducting member according to one embodiment of the present application;

[0176] Figure 89 yes Figure 87 An enlarged view of the circled portion I;

[0177] Figure 90 yes Figure 88 An enlarged view of the J section circled in the middle;

[0178] Figure 91 yes Figure 90 Another schematic diagram of the heat conductor;

[0179] Figure 92 is a schematic diagram of a heat conducting member according to one embodiment of the present application;

[0180] Figure 93 is a schematic diagram of a heat conducting member according to one embodiment of the present application;

[0181] Figure 94 yes Figure 93 An enlarged view of the K section circled in the middle;

[0182] Figure 95 is a schematic diagram of a heat conducting member according to one embodiment of the present application;

[0183] Figure 96 yes Figure 95 An enlarged view of the L portion circled in the middle;

[0184] Figure 97 is a partial schematic diagram of a heat conducting member according to one embodiment of the present application;

[0185] Figure 98 is a partial schematic diagram of a heat conducting member according to one embodiment of the present application;

[0186] Figure 99 is a schematic diagram of a heat conducting member according to one embodiment of the present application;

[0187] Figure 100 is a schematic diagram of a battery according to one embodiment of the present application;

[0188] Figure 101 yes Figure 100 An exploded view of the battery shown in ;

[0189] Figure 102 is a schematic diagram of a battery according to one embodiment of the present application;

[0190] Figure 103 is a schematic diagram of a heat conducting member according to one embodiment of the present application;

[0191] Figure 104 is a schematic diagram of a heat conducting member according to one embodiment of the present application;

[0192] Figure 105 is a schematic diagram of a heat conducting member according to one embodiment of the present application;

[0193] Figure 106 is a schematic diagram of a heat conducting member according to one embodiment of the present application;

[0194] Figure 107 is a schematic diagram of a battery according to one embodiment of the present application;

[0195] Figure 108 is a schematic diagram of a battery according to one embodiment of the present application;

[0196] Figure 109 is a schematic diagram of a battery according to one embodiment of the present application;

[0197] Figure 110 is a schematic diagram of a battery cell according to one embodiment of the present application;

[0198] Figure 111 is a schematic diagram of a battery according to one embodiment of the present application;

[0199] Figure 112 is a schematic diagram of a battery according to one embodiment of the present application;

[0200] Figure 113 yes Figure 112Schematic diagram of the heat conducting member shown in ;

[0201] Figure 114 is a schematic diagram of a heat conducting member according to one embodiment of the present application;

[0202] Figure 115 yes Figure 114 Another schematic diagram of the heat conductor;

[0203] Figure 116 A schematic structural diagram of a housing provided in some embodiments of the present application;

[0204] Figure 117 for Figure 116 A CC cross-sectional view of the housing is shown;

[0205] Figure 118 for Figure 117 The grain map (schematic) of the shell shown;

[0206] Figure 119 for Figure 117 A partial enlarged view of the housing at position E is shown;

[0207] Figure 120 A partial enlarged view of a housing provided for other embodiments of the present application;

[0208] Figure 121 Schematic diagram of the structure of the housing provided in some other embodiments of the present application (showing the primary scoring groove);

[0209] Figure 122 for Figure 121 EE cross-sectional view of the housing shown;

[0210] Figure 123 A schematic structural diagram of a housing provided in some further embodiments of the present application (showing a primary notch groove);

[0211] Figure 124 for Figure 123 FF cross-sectional view of the housing shown;

[0212] Figure 125 Schematic diagram of the structure of the housing provided in some other embodiments of the present application (showing the primary scoring groove);

[0213] Figure 126 for Figure 125 GG cross-sectional view of the housing shown;

[0214] Figure 127 A schematic structural diagram of a housing provided in some further embodiments of the present application (showing two-stage scoring grooves);

[0215] Figure 128 for Figure 127KK sectional view of the housing shown;

[0216] Figure 129 A schematic structural diagram of a housing provided in some further embodiments of the present application (showing two-stage notched grooves);

[0217] Figure 130 for Figure 129 MM cross-sectional view of the housing shown;

[0218] Figure 131 Schematic diagram of the structure of the housing provided in some other embodiments of the present application (showing two-level scoring grooves);

[0219] Figure 132 for Figure 131 NN cross-sectional view of the housing shown;

[0220] Figure 133 An axonometric view of a housing provided for some embodiments of the present application;

[0221] Figure 134 for Figure 133 A schematic structural diagram of the housing shown (showing the primary scoring groove and the primary sink groove);

[0222] Figure 135 for Figure 134 OO cross-sectional view of the housing shown;

[0223] Figure 136 A schematic structural diagram of a housing provided for some further embodiments of the present application (showing a primary scoring groove and a primary sinking groove);

[0224] Figure 137 for Figure 136 PP cross-sectional view of the housing shown;

[0225] Figure 138 Schematic diagram of the structure of the housing provided for other embodiments of the present application (showing the primary scoring groove and the primary sinking groove);

[0226] Figure 139 for Figure 138 QQ cross-sectional view of the housing component shown;

[0227] Figure 140 A schematic diagram of the structure of the housing provided for some embodiments of the present application (showing a primary scoring groove and a two-stage sinking groove);

[0228] Figure 141 for Figure 140 RR cross-sectional view of the housing components shown;

[0229] Figure 142 A schematic structural diagram of a housing provided for some further embodiments of the present application (showing a primary scoring groove and a two-stage sinking groove);

[0230] Figure 143 for Figure 142 SS cutaway view of the housing shown;

[0231] Figure 144 Schematic diagram of the structure of the housing components provided in some other embodiments of the present application (showing a primary scoring groove and a two-stage sinking groove);

[0232] Figure 145 for Figure 144 TT cross-sectional view of the housing shown;

[0233] Figure 146 A schematic structural diagram of a housing provided in other embodiments of the present application;

[0234] Figure 147 A grain diagram (schematic diagram) of a housing provided for some other embodiments of the present application;

[0235] Figure 148 A schematic structural diagram of an end cap provided in some embodiments of the present application;

[0236] Figure 149 A schematic structural diagram of a housing provided in some embodiments of the present application;

[0237] Figure 150 A schematic structural diagram of a housing provided in some other embodiments of the present application;

[0238] Figure 151 A schematic structural diagram of a battery cell provided in some embodiments of the present application;

[0239] Figure 152 This is a schematic structural diagram of a positive electrode current collector according to a specific embodiment of the present application;

[0240] Figure 153 This is a schematic structural diagram of a positive electrode current collector according to another specific embodiment of the present application;

[0241] Figure 154 This is a schematic structural diagram of the negative electrode current collector according to a specific embodiment of the present application;

[0242] Figure 155 This is a schematic structural diagram of a negative electrode current collector according to another specific embodiment of the present application;

[0243] Figure 156 This is a schematic structural diagram of a positive electrode sheet according to a specific embodiment of the present application;

[0244] Figure 157 This is a schematic structural diagram of a positive electrode sheet according to another specific embodiment of the present application;

[0245] Figure 158This is a schematic structural diagram of a negative electrode sheet according to a specific embodiment of the present application;

[0246] Figure 159 This is a schematic structural diagram of a negative electrode sheet according to another specific embodiment of the present application;

[0247] Figure 160 This is a schematic diagram of a nail penetration experiment for this application;

[0248] Figure 161 The temperature change curves of lithium-ion battery 1# and lithium-ion battery 4# after a nail penetration test;

[0249] Figure 162 The voltage change curves of lithium-ion battery 1# and lithium-ion battery 4# after a nail penetration test;

[0250] Figure 163 X-ray diffraction patterns (XRD) of undoped LiMnPO4 and the positive electrode active material prepared in Example 2;

[0251] Figure 164 This is an X-ray energy dispersive spectrum (EDS) diagram of the positive electrode active material prepared in Example 2;

[0252] Figure 165 Schematic diagram of the positive electrode active material with a core-shell structure described in this application;

[0253] Figure 166 Schematic diagram of a positive electrode active material with a core-shell structure according to one embodiment of the present application;

[0254] Figure 167 Schematic diagram of a heat conducting member and a separator provided in some embodiments of the present application;

[0255] Figure 168 for Figure 167 Schematic diagram of a heat conducting member and multiple battery cells shown in FIG. DETAILED DESCRIPTION

[0256] 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, that is, the present application is not limited to the described embodiments.

[0257] 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.

[0258] 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.

[0259] 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.

[0260] 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).

[0261] 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.

[0262] 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.

[0263] 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.

[0264] 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.

[0265] 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.

[0266] 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.

[0267] 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.

[0268] The box 10 may include a first portion 101 and a second portion 102 (eg Figure 2 and Figure 3As shown, the first portion 101 and the second portion 102 overlap each other, and the first portion 101 and the second portion 102 jointly define a storage space for accommodating the battery cell 20. The second portion 102 can 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 box with a storage space. The first portion 101 and the second portion 102 can 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 box with a storage space. Of course, the first portion 101 and the second portion 102 can have various shapes, such as cylinders, cuboids, etc.

[0269] 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 .

[0270] 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 currents 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.

[0271] 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.

[0272] 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.

[0273] Of course, the battery cell may not include electrolyte.

[0274] To meet different power requirements, a battery can include multiple battery cells, where the multiple battery cells can be connected in series, parallel, or in a hybrid connection. Hybrid connection refers to a mixture of series and parallel connections. Optionally, multiple battery cells can first be connected in series, parallel, or in a hybrid connection to form a battery module, and multiple battery modules can then be connected in series, 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 modules can then be combined into a battery. The battery is further installed in an electrical device to provide electrical energy to the electrical device.

[0275] The development of battery technology requires simultaneous consideration of multiple design factors, such as energy density, cycle life, discharge capacity, charge / discharge rate, and safety. Within a given internal battery volume, increasing the utilization of the space is an effective way to increase energy density. However, while increasing the utilization of the internal battery volume, thermal conductivity and thermal management also need to be considered.

[0276] During battery charging and discharging, a significant amount of heat is generated. This heat, especially during fast charging, accumulates within the battery cells, 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 thermal management requirements of the battery are crucial.

[0277] In view of this, the embodiments of the present application provide a technical solution. In the embodiments of the present application, a battery cell is arranged to be accommodated in a housing cavity, and a heat conductive member is provided to be thermally connected to the first wall of the battery cell. The heat conductive member is used to conduct heat from the battery cell, thereby ensuring heat conduction in the battery. Therefore, the technical solution of the embodiments of the present application can effectively ensure heat conduction in the battery, thereby improving the thermal management performance of the battery.

[0278] 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.

[0279] 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.

[0280] For example, Figure 1 FIG2 is a schematic diagram of the structure of a vehicle 1000 according to one embodiment of the present application. 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 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.

[0281] In order to meet different power requirements, the battery 100 may include one or more battery cells 20. For example, Figure 2 and Figure 3 FIG2 is a schematic diagram of the structure of a battery 100 according to an embodiment of the present application. The battery 100 may include a plurality of battery cells 20. The battery 100 may also include a housing 10. The housing 10 has a hollow interior and accommodates the plurality of battery cells 20. For example, the plurality of battery cells 20 may be connected in parallel, in series, or in a mixed combination and then placed in the housing 10.

[0282] Optionally, the battery 100 may also include other structures, which will not be described one by one here. For example, the battery 100 may also include a busbar component (not shown in the figure), which is used to realize electrical connection between multiple battery cells 20, such as parallel or series or mixed connection. Specifically, the busbar component can realize 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 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.

[0283] 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.

[0284] like Figure 4, which is a schematic structural diagram of a battery cell 20 according to an embodiment of the present application, wherein the battery cell 20 includes one or more electrode assemblies 22, a shell 211 and a cover plate 212. The shell 211 and the cover plate 212 form the outer shell or battery box 21 of the battery cell 20. The walls of the shell 211 and the cover plate 212 are both referred to as the walls of the battery cell 20, wherein 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 combination. For example, the shell 211 can be a hollow cuboid, a cube or a cylinder, and one of the surfaces of the shell 211 has an opening so that one or more electrode assemblies 22 can be placed in the shell 211, and the cover plate 212 covers the opening of the shell 211 to isolate the internal environment of the battery cell 20 from the external environment. For example, when the housing 211 is a hollow cuboid or cube, one of the planes of the housing 211 is an open surface, that is, the plane does not have a wall, so that the inside and outside of the housing 211 are in communication. When the housing 211 can be a hollow cylinder, the end surface of the housing 211 is an open surface, that is, the end surface does not have a wall, so that the inside and outside of the housing 211 are in communication. The cover plate 212 covers the opening and is connected to the housing 211 to form a closed cavity for placing the electrode assembly 22. The housing 211 is filled with an electrolyte, such as an electrolyte solution.

[0285] The battery cell 20 may also include two electrode terminals 214, which may be disposed on the cover plate 212. The cover plate 212 is typically flat, with the two electrode terminals 214 secured to the flat surface of the cover plate 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, which is located between the cover plate 212 and the electrode assembly 22 and electrically connects the electrode assembly 22 to the electrode terminals 214.

[0286] like Figure 4 As shown, 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.

[0287] In the battery cell 20, the electrode assembly 22 can be provided as a single one or multiple ones according to actual use requirements. Figure 4 As shown, four independent electrode assemblies 22 are provided in the battery cell 20 .

[0288] A pressure relief mechanism 213 may also be provided on the battery cell 20. The pressure relief mechanism 213 is used to be activated to release the internal pressure or temperature of the battery cell 20 when the internal pressure or temperature reaches a threshold value.

[0289] The pressure relief mechanism 213 may be of various possible pressure relief structures, which are not limited in the present embodiment. For example, the pressure relief mechanism 213 may be a temperature-sensitive pressure relief mechanism configured to melt when the internal temperature of the battery cell 20 equipped with the pressure relief mechanism 213 reaches a threshold; and / or the pressure relief mechanism 213 may be a pressure-sensitive pressure relief mechanism configured to rupture when the internal pressure of the battery cell 20 equipped with the pressure relief mechanism 213 reaches a threshold.

[0290] Figure 10 A schematic structural diagram of a battery 100 according to an embodiment of the present application is shown.

[0291] like Figure 10 As shown, the battery 100 includes a case 10, a battery cell 20 and a heat conductor 3a. The case 10 has a accommodating cavity 10a. The battery cell 20 is accommodated 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. The battery cell 20 includes a first wall 201. The first wall 201 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 a heat exchange medium. 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.

[0292] 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.

[0293] 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.

[0294] 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.

[0295] For example, when the temperature of the battery cell 20 is too high, the heat conducting member 3a may 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 conducting member 3a may heat the battery cell 20 to increase the temperature of the battery cell 20.

[0296] 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.

[0297] 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.

[0298] In some embodiments, as Figure 4-Figure 6 As shown, the battery cell 20 also includes a second wall 202 connected to the first wall 201. The first wall 201 and the second wall 202 are arranged to intersect each other, so the first wall 201 and the second wall 202 are not parallel, and the first wall 201 and the second wall 202 have a common line; wherein, 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.

[0299] For example, in Figure 4 and Figure 5 In the example of , the battery cell 20 is generally formed into a rectangular parallelepiped structure, and 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 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 the two sides in the second direction y, and the battery cell 20 has a second wall 202 on at least one of the two sides in the third direction z, and the electrode terminal 214 can be provided on the second wall 202 of the battery cell 20 in the third direction z; of course, as Figure 6As shown, the electrode terminal 214 may also be provided on the second wall 202 of the battery cell 20 in the second direction y.

[0300] Optionally, in Figure 6 In the example, 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 third 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.

[0301] Of course, in this application, the location of the electrode terminal 214 is not limited to this. Figure 7 and Figure 8 As shown, the electrode terminals 214 can also be provided on the first wall 201, which also facilitates the arrangement of the electrode terminals 214; for example, the battery cell 20 is a One-Stop battery cell. It can be seen that the battery 100 in the embodiment of the present application has good flexibility in the arrangement position of the electrode terminals.

[0302] In some embodiments, as Figure 8 As shown, the motor terminal 214 is provided on the first wall 201, there are multiple battery cells 20, and the multiple battery cells 20 are arranged in the 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 realize the compact arrangement of multiple battery cells 20 in the first direction and save space.

[0303] In some embodiments, as Figure 4-Figure 6 As shown, the electrode terminal 214 is provided on the second wall 202 , the battery cell 20 includes two first walls 201 and two second walls 202 arranged opposite to each other, and at least two electrode terminals 214 are provided, and the multiple electrode terminals 214 include a positive electrode terminal 214a and a negative electrode terminal 214b .

[0304] 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.

[0305] For example, in Figure 4 and Figure 5 In the example, the battery cell 20 includes two first walls 201 arranged opposite to each other along a first direction x and two second walls 202 arranged opposite to each other along a third direction z, where the third direction z is not parallel to the first direction x, for example, the third 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 third direction z.

[0306] 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 x, 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.

[0307] 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 third 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.

[0308] 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.

[0309] In some embodiments, as Figure 9 As shown, the first wall 201 is formed into a cylindrical shape; in this case, the battery cell 20 can be a substantially cylindrical battery cell.

[0310] In some embodiments, as Figure 9 As shown, 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.

[0311] In some embodiments, as Figure 9As shown, 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.

[0312] 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.

[0313] 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.

[0314] In some embodiments, as Figure 4 and Figure 5 As shown, the battery cell 20 further includes a pressure relief mechanism 213 . The pressure relief mechanism 213 and the electrode terminal 214 are disposed on the same wall of the battery cell 20 . For example, the pressure relief mechanism 213 and the electrode terminal 214 are both disposed on the second wall 202 .

[0315] 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 terminals 214 are respectively disposed on two walls of the battery cell 20 .

[0316] Therefore, the position of the pressure relief mechanism 213 relative to the electrode terminal 214 has a certain degree of flexibility.

[0317] 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.

[0318] 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 .

[0319] 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.

[0320] 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.

[0321] 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.

[0322] In some embodiments, the bottom of the heat conductor 3a is bonded to the bottom wall 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 of the accommodating cavity 10a to achieve a fixed connection between the heat conductor 3a and the bottom wall 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 wall of the accommodating cavity 10a to ensure the reliable setting of the heat conductor 3a.

[0323] In some embodiments, the bottom of the battery cell 20 is bonded to the bottom wall 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 of the accommodating cavity 10a, thereby achieving a fixed connection between the battery cell 20 and the bottom wall 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 of the accommodating cavity 10a, then the heat conductor 3a is indirectly fixed to the bottom wall of the accommodating cavity 10a through the battery cell 20.

[0324] In some embodiments, the bottom of the heat conductor 3a is bonded to the bottom wall of the accommodating cavity 10a via a second adhesive layer, and the bottom of the battery cell 20 is bonded to the bottom wall of the accommodating cavity 10a via a third adhesive layer.

[0325] 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 of the accommodating cavity 10a.

[0326] 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 of the accommodating cavity 10a, thereby ensuring the heat transfer efficiency between the battery cell 20 and the heat conductor 3a.

[0327] 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.

[0328] 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 for 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 of the accommodating cavity 10a.

[0329] 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 of the accommodating cavity 10a respectively.

[0330] Of course, part of the heat of the battery cell 20 can also be transferred to the bottom wall of the accommodating cavity 10a through the third adhesive layer for dissipation.

[0331] 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.

[0332] 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.

[0333] 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.

[0334] 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.

[0335] 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.

[0336] 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.

[0337] 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.

[0338] 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.

[0339] 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.

[0340] In some embodiments, as Figure 10-13 As shown, the heat conducting member 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 heat conducting member 3a, and the insulating layer 32 can insulate the surface of the heat conducting member 3a that is connected to the first wall 201, thereby preventing electrical connection between the metal plate 31 and the battery cell 20, thereby ensuring electrical insulation in the battery 100.

[0341] 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 .

[0342] 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.

[0343] In some embodiments, as Figure 14 、 Figure 15 and Figure 30 As shown, there are multiple battery cells 20, and the multiple battery cells 20 are arranged along the second direction y; the heat conductive member 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.

[0344] 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.

[0345] 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.

[0346] 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.

[0347] 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.

[0348] 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 .

[0349] 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.

[0350] The thermal management component can also be a structure that can accommodate 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 (such as water) or a gas (such as air). In this case, if the temperature of the fluid medium contained in 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 in 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.

[0351] 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 .

[0352] 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.

[0353] 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.

[0354] 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.

[0355] 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.

[0356] 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 ℃).

[0357] In some embodiments, the density G of the insulating layer 32 is less than or equal to 1.5 g / cm 3 .

[0358] The insulating layer 32 disposed on the surface of the separator 33 increases the weight of the battery 100. The lower the density of the insulating layer 32, the smaller the mass of the insulating layer 32; the higher the density of the insulating layer 32, the greater the mass of the insulating layer 32. A density G of the insulating layer 32 ≤ 1.5 g / cm³ reduces the weight of the insulating layer 32, thereby reducing the weight of the battery 100. This reduces the impact of the insulating layer 32 on the weight of the battery 100, contributing to a lighter battery 100.

[0359] 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.

[0360] Compressive strength refers to the maximum compressive stress that a specimen can withstand until it breaks or yields during a compression test.

[0361] 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.

[0362] 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.

[0363] 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.

[0364] 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.

[0365] 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.

[0366] 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, where it 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.

[0367] In some embodiments, as Figure 14As shown, the 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 can prevent the separator 33 from being too large in the first direction x and occupying too much space inside the battery 100, further improving the space utilization inside the battery 100 and thereby increasing the energy density of the battery 100.

[0368] In some embodiments, the dimension T1 of the separator 33 in the first direction x is not less than 0.05 mm. This can avoid the separator 33 being too small in the first direction x, i.e., the separator 33 being too thin and having too little rigidity to meet the strength requirements of the battery 100.

[0369] In some embodiments, as Figure 14 As shown in (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. Optionally, the insulating layer 32 can be an insulating film bonded to the surface of the separator 33 or an insulating paint coated on the surface of the separator 33.

[0370] In some embodiments, a dimension T2 of the insulating layer 32 in the first direction x satisfies: 0.01 mm≤T2≤0.3 mm.

[0371] 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.

[0372] 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.

[0373] 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.

[0374] 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: 0.25≤S1 / S2≤4, where S1=H1*L1, S2=H2*L2. Figure 15 As shown, H1 is the size of the separator 33 in the third direction z, L1 is the size of the separator 33 in the second direction y, H2 is the size of a single battery cell 20 in the third direction z, and L2 is the sum of the sizes of multiple battery cells 20 in the second direction y.

[0375] 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.

[0376] In some embodiments, as Figure 15 As shown, in the third direction z, the dimension H1 of the partition 33 and the dimension H2 of the first wall 201 of the battery cell 20 satisfy: 0.2≤H1 / H2≤2. The third direction z is perpendicular to the first direction x and the second direction y.

[0377] When H1 / H2 is too small, that is, in the third direction z, 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 z, 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.

[0378] In some embodiments, as Figure 15 As shown, in the second direction y, the size L1 of the separator 33 and the size L2 of the plurality of battery cells 20 satisfy: 0.5≤L1 / L2≤2.

[0379] 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.

[0380] 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 .

[0381] The first direction x the first direction x the first direction x the first direction x adopts the Figure 14 The battery cell 20 and separator 33 shown in FIG were subjected to a vibration and impact test for the separator under the standard GB38031-2020 "Safety Requirements for Power Batteries for Electric Vehicles." The test results are shown in Table 1. In Table 1, T1 represents the separator's dimension in the first direction x, H1 represents the separator's dimension in the third direction z, L1 represents the separator's dimension in the second direction y, H2 represents the dimension of a single battery cell in the third direction z, and L2 represents the sum of the dimensions of multiple battery cells in the second direction y. S1 = H1 * L1, and S2 = H2 * L2.

[0382] Table 1

[0383] T1(mm) H2(mm) L2(mm) L1(mm) H1(mm) S1 / S2 L1 / L2 H1 / H2 Vibration shock test results 0.1 30 400 800 60 4 2 2 No cracking, no fire or explosion 0.5 30 400 200 15 0.25 0.5 1 No cracking, no fire or explosion 0.4 80 1148 1148 40 0.5 1 0.4 No cracking, no fire or explosion 0.4 80 1148 574 80 0.5 0.5 0.8 No cracking, no fire or explosion 0.2 112 1164 1224 100 0.94 1.05 0.19 No cracking, no fire or explosion 0.4 127 348 278.4 63.5 0.4 0.8 0.5 No cracking, no fire or explosion 0.4 127 348 174 63.5 0.25 0.5 0.8 No cracking, no fire or explosion 0.3 205 522 582 193 1.05 1.11 0.27 No cracking, no fire or explosion 0.5 205 522 417.6 102.5 0.4 0.80 0.625 No cracking, no fire or explosion 0.1 112 776 836 100 0.96 1.08 0.09 No cracking, no fire or explosion 0.5 112 1164 1224 100 0.94 1.05 0.48 No cracking, no fire or explosion

[0384] Use attached Figure 14 and Figure 15 The battery cell 20 and separator 33 shown in FIG were tested for insulation withstand voltage capability under the following conditions: an insulation test of 1000 VDC with an insulation resistance of ≥ 500 MΩ; and a withstand voltage test of 2700 VDC for 60 seconds with a leakage current of ≤ 1 mA, in accordance with IEC 60664-1. The test results are shown in Table 2. In Table 2, T2 represents the dimension of the insulating layer in the first direction x, and E represents the battery voltage.

[0385] Table 2

[0386] T2(mm) E(V) <![CDATA[T2 / E(10 -3 mm / V)]]> Insulation withstand voltage test results 0.01 1000 0.01 Insulation withstand voltage meets requirements 0.3 1000 0.3 Insulation withstand voltage meets requirements 0.3 100 3 Insulation withstand voltage meets requirements 0.15 400 0.38 Insulation withstand voltage meets requirements 0.15 800 0.19 Insulation withstand voltage meets requirements 0.3 300 1 Insulation withstand voltage meets requirements 0.3 200 1.5 Insulation withstand voltage meets requirements 0.2 800 0.25 Insulation withstand voltage meets requirements 0.2 350 0.57 Insulation withstand voltage meets requirements

[0387] In some embodiments, as Figure 30 and Figure 31 As shown, the 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.

[0388] For example, Figure 30 As shown, the battery 10 includes a plurality of battery cells 20 arranged along a second direction Y and a separator 33 . The separator 33 extends along the second direction Y and is connected to the first wall 201 of each of the plurality of battery cells 20 .

[0389] In some embodiments, a dimension T1 of the partition in the first direction x is no greater than 100 mm.

[0390] 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.

[0391] In some embodiments, as Figure 31 As shown, the dimension T1 of the separator 33 in the first direction x and the dimension T3 of the battery cell 20 in the first direction x satisfy: 0.04≤T1 / T3≤2.

[0392] 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.

[0393] 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.

[0394] 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.

[0395] 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.

[0396] The present application also proposes a method for preparing a battery 100, which may include: providing a plurality of battery cells 20 arranged along a second direction y; providing a partition 33, which extends along the second direction y and is connected to the first wall 201 of each battery cell 20 in the plurality of battery cells 20, the first wall 201 being the wall with the largest surface area in the battery cell 20, wherein a dimension T1 of the partition 33 in the first direction x is greater than 5 mm, and the first direction x is perpendicular to the first wall 201.

[0397] The present application also proposes an apparatus for preparing a battery 100, which may include: providing a module, providing a module for providing a plurality of battery cells 20 and a partition 33, the partition 33 extending along a second direction y and connected to a first wall 201 of each battery cell 20 in the plurality of battery cells 20, the partition 33 being opposite to the battery cell 20 along a first direction x, the first wall 201 being the wall with the largest surface area in the battery cell 20, wherein a dimension T1 of the partition 33 in the first direction x is greater than 5 mm, and the first direction x is perpendicular to the first wall 201.

[0398] Use attached Figure 30-34 The battery cell 20 and separator 33 shown in FIG were subjected to a 1C / 1C charge-discharge cycle at 60°C until the capacity decayed to 80% SOC. The results of the cycle endurance acceleration test 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.

[0399] Table 3

[0400]

[0401]

[0402] In some embodiments, as Figure 10-13 As shown, 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 0.1mm~100mm, and the first direction is perpendicular to the first wall 201, so as to take into account both strength and space requirements.

[0403] 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 mm to 100 mm can improve space utilization while maintaining strength.

[0404] 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 mm 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.

[0405] 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.

[0406] 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.

[0407] 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.

[0408] 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.

[0409] 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.

[0410] 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 .

[0411] 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.

[0412] S2 is 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, affecting safety. When 0.2 ≤ S4 / S3 ≤ 30, the energy density and safety of the battery 10 are guaranteed.

[0413] 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 .

[0414] In some embodiments, the specific heat capacity C of the heat conducting member 3a and the weight M2 of the heat conducting member 3a satisfy the following relationship: 0.02KJ / (kg 2 *℃)≤C / M2≤100KJ / (kg 2 *℃).

[0415] When C / M2 is less than 0.02 kJ / (kg²*°C), the thermal conductor 3a absorbs a large amount of energy, causing the battery cell 20 to cool too low, potentially leading to lithium deposition. When C / M2 is greater than 100 kJ / (kg²*°C), the thermal conductor 3a has poor thermal conductivity and cannot remove heat in a timely manner. When 0.02 kJ / (kg²*°C) ≤ C / M2 ≤ 100 kJ / (kg²*°C), the safety performance of the battery 100 is guaranteed.

[0416] Optionally, C and M2 may further satisfy the following relationship:

[0417] 0.3KJ / (kg2*℃)≤C / M2≤20KJ / (kg2*℃) to further improve the safety performance of the battery 100.

[0418] 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.

[0419] Optionally, the battery module 100a includes two columns of battery cells 20, and a heat conductor 3a is provided between the two columns of battery cells 20. No heat conductor 3a is provided between adjacent battery modules 100a. Thus, this embodiment can provide fewer heat conductors 3a within the battery 100 while ensuring that each battery cell 20 can be connected to a heat conductor 3a.

[0420] 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 .

[0421] 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 box body 10 through the fixing structure 103. Figure 19 As shown, the fixing structure 103 may include a fixing member 104 , which is fixedly connected to the end of the heat conducting member 3 a and connected to the battery cell 20 located at the end of the heat conducting member 3 a , thereby enhancing the fixing effect on the battery cell 20 .

[0422] 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.

[0423] The first direction x the first direction x the first direction x the first direction x adopts the Figure 10-13 The battery cells 20 and the heat conductor 3a are shown in the figure, where the number of battery cells 20 in a column of battery cells 20 is 2-20. The battery 10 is safety tested according to 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.

[0424] Table 4

[0425] serial number T5 / mm T3 / mm T5 / T3 Test results 1 0.2 40 0.005 No fire, no explosion 2 0.4 50 0.008 No fire, no explosion 3 0.7 45 0.016 No fire, no explosion 4 4 10 0.4 No fire, no explosion 5 4 40 0.1 No fire, no explosion 6 45 15 3 No fire, no explosion 7 150 10 15 Fire, explosion

[0426] Table 5

[0427] serial number M2 / Kg M1 / Kg M2 / M1 Test results 1 0.2 3 0.068 No fire, no explosion 2 0.4 2.5 0.16 No fire, no explosion 3 0.7 1.5 0.467 No fire, no explosion 4 10 1.5 6.7 No fire, no explosion 5 15 1 15 No fire, no explosion

[0428] Table 6

[0429] serial number <![CDATA[S4 / mm 2 ]]> <![CDATA[S31 / mm 2 ]]> S4 / S3 Test results 1 3120 21728 0.14 Fire, explosion 2 19500 38800 0.5 No fire, no explosion 3 65000 16800 3.87 No fire, no explosion 4 130000 16576 7.84 No fire, no explosion 5 216000 9600 22.5 No fire, no explosion 6 250000 7200 34.72 Fire, explosion

[0430] Table 7

[0431]

[0432]

[0433] In some embodiments, as Figure 15 and Figure 35 As shown, in the third direction z, the dimension H1 of the partition 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 further maximizes the space utilization within the battery 100, thereby increasing the energy density of the battery 100.

[0434] In the third direction z, 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.

[0435] 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.

[0436] 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 z, making it difficult to ensure the energy density requirements of the battery 100.

[0437] 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.

[0438] 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 z is H1 .

[0439] 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.

[0440] Optionally, the thermal management component 3b may be made of a material with good thermal conductivity, such as metal materials such as aluminum.

[0441] 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.

[0442] Optionally, H1 / H2 can be 0.3, or 0.5, or 0.8, or 1.0, or 1.1, or 1.3, etc.

[0443] 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 .

[0444] The heat exchange area S may be the contact area between the first wall 201 and the partition 33 , and the heat exchange area S satisfies: S=H1*L, where L is the size of each battery cell 20 along the second direction y.

[0445] When Q / S<0.03Ah / cm 2 When , the heat exchange area S is large enough to meet the thermal management requirements of the battery, but at this time the space occupied by the partition 33 is too large to meet the energy density requirements of the battery 100.

[0446] When Q / S>6.66Ah / cm 2 When the heat exchange area S is small, the heat of the battery cell 20 cannot be discharged through the partition 33 in time, and the battery cell 20 cannot be cooled quickly in time, which makes it difficult to meet the thermal management requirements.

[0447] 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.

[0448] 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.

[0449] The battery was charged and tested. The test results are shown in Table 8.

[0450] Table 8 Temperature test of battery cells and thermal management components of different specifications during charging

[0451]

[0452] In some embodiments, as Figure 12 and Figure 32 As shown, a cavity 30 a is provided inside the partition 33 .

[0453] 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.

[0454] 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.

[0455] 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.

[0456] 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.

[0457] In some embodiments, as Figure 12 and Figure 32 As shown, in the 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 the battery cell 20 with excessive temperature, the heat of the battery cell 20 can be prevented from diffusing and transferring to the adjacent battery cell 20, thereby causing the temperature of the adjacent battery cell 20 to be too high.

[0458] 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.

[0459] 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.

[0460] 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.

[0461] Figure 36 This is a structural diagram of the connection between a battery cell and a thermal management component according to an embodiment of the present application. Figure 37 for Figure 36 The cross-section along the AA direction, Figure 38 for Figure 37 In one embodiment of the present application, combined with Figures 36 to 38 , a dimension T3 of the battery cell 20 along the first direction x and a dimension H of the heat management component 3 b along the third direction satisfy: 0.03≤T3 / H≤5.5, and the third direction is perpendicular to the first direction and the second direction.

[0462] 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.

[0463] 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.

[0464] 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.

[0465] 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.

[0466] 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.

[0467] 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.

[0468] The following is a combination of two rows of battery cells 20 and two separators 33, and a thermal diffusion test is performed on the battery 100 according to GB38031-2020. The test results are shown in Table 9.

[0469] Table 9 Thermal diffusion test of battery cells and separators of different specifications

[0470] (Q / Ah) (T3 / mm) (H / mm) (W / mm) Q / W T3 / H Whether heat diffusion 280 88 260 50 5.6 0.3385 no 280 88 260 6 46.6667 0.3385 no 280 88 102 6 46.6667 0.8627 no 280 88 102 3 93.3333 0.8627 no 280 88 102 0.8 350 0.8627 no 280 88 30 6 46.6667 2.9333 no 280 88 13 0.6 466.6667 6.7692 yes 248 66.5 80 2 124 0.8313 no 248 66.5 102 0.8 310 0.652 no 169 70 102 3 56.6666 0.6863 no 70 28.5 102 2 35 0.2794 no 180 79 80 2 90 0.9875 no 117 33.2 102 0.8 146.25 0.3255 no 5 12.5 50 3 1.6667 0.25 no 5 12.5 150 3 1.6667 0.0833 no 5 12.5 102 0.8 6.25 0.1225 no

[0471] In some embodiments, as Figure 32 、 Figure 33 and Figure 38 As shown, the partition 33 further includes a pair of heat conducting plates 333 arranged opposite to each other along a first direction, the cavity 30 a is arranged between the pair of heat conducting plates 333 , and the first direction is perpendicular to the first wall 201 .

[0472] 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.

[0473] In some embodiments, as Figure 32 As shown, the dimension D of the heat conducting plate 333 in the first direction x is 0.1 mm to 5 mm.

[0474] 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.

[0475] 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.

[0476] Optionally, the two heat conducting plates 333 may be made of a material with good thermal conductivity, such as metal materials such as aluminum.

[0477] In some embodiments, as Figure 33 and Figure 38 As shown, 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 .

[0478] 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 .

[0479] Optionally, when there are multiple cavities 30a, different cavities 30a may be independent of each other or connected via adapters.

[0480] 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.

[0481] In some embodiments, as Figure 33 and Figure 45 As shown, the 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 .

[0482] Alternatively, as Figure 33 As shown, 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 .

[0483] Alternatively, as Figure 33As shown, 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 can be an acute angle to provide more expansion space for the battery cell 20; Figure 33 As shown, 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 can also be a right angle, so that the partition can withstand greater pressure.

[0484] 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.

[0485] In some embodiments, as Figure 45 As shown, 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 toward each other at least partially along the first direction x.

[0486] 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.

[0487] Optionally, there may be one or more first reinforcing ribs 3341 , and the plurality of first reinforcing ribs 3341 may be spaced apart along the third direction z; wherein the spacing between two adjacent first reinforcing ribs 3341 may be the same or different.

[0488] 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.

[0489] 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.

[0490] 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.

[0491] In some embodiments, as Figure 45 As shown, 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.

[0492] 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.

[0493] In some embodiments, as Figure 45 As shown, 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.

[0494] 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.

[0495] 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.

[0496] In some embodiments, as Figure 45 As shown, in the third direction z, 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.

[0497] In some embodiments, as Figure 45 As shown, the second reinforcing rib 3342 extends along the first direction x and protrudes from one of the pair of heat conducting plates 333 , which simplifies the structure of the second reinforcing rib 3342 and facilitates processing.

[0498] 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.

[0499] In some embodiments, as Figure 45 As shown, 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.

[0500] In some embodiments, along the third direction z (for example, the height direction of the box body 10), the first reinforcing ribs 3341 and the second reinforcing ribs 3342 are alternately distributed. For example, two adjacent first reinforcing ribs 3341 and second reinforcing ribs 3342 can be alternately arranged on the first heat conduction plate 3331 and the second heat conduction plate 3332. Of course, the position of the second reinforcing ribs 3342 can also be set according to a certain arrangement pattern.

[0501] Illustratively, in the third direction z, one of the two adjacent second reinforcing ribs 3342 is arranged on the first heat conducting plate 3331, and the other is arranged 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.

[0502] 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.

[0503] In some embodiments, as Figure 32 and Figure 45 As shown, in the first direction x, the thickness D of the heat conducting plate 333 and the size W of the cavity satisfy: 0.01≤D / W≤25, so as to take into account both strength and thermal management performance requirements.

[0504] 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.

[0505] 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.

[0506] 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 .

[0507] 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.

[0508] 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 .

[0509] Optionally, a dimension T1 of the partition 33 in the first direction x is 0.3 mm to 100 mm.

[0510] 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.

[0511] Optionally, the thickness D of the heat conducting plate 333 is 0.1 mm to 25 mm.

[0512] 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.

[0513] Optionally, a dimension W of the cavity 30a in the first direction is 0.1 mm to 50 mm.

[0514] 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.

[0515] 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 .

[0516] When T1 and A 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 / S3*1000≤2mm -1 When the battery is heated, the strength and thermal management performance requirements can be taken into account at the same time to ensure the performance of the battery 100.

[0517] 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.

[0518] The thickness X of the reinforcing rib 334 is related to the tensile strength of its material. Based on 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.

[0519] The first direction x the first direction x the first direction x the first direction x the first direction x the first direction x adopts the attached Figure 45 The battery cell 20 and separator 33 shown in FIG were subjected to simulation tests on heating rate and separator 33 deformation force. The test results are shown in Table 10. In Table 10, L is the dimension of the battery cell 20 in the second direction y and the first direction x, 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 z, which is perpendicular to the first direction x and the second direction y.

[0520] Table 10

[0521]

[0522]

[0523] In some embodiments, as Figure 47 、 Figure 48 、 Figure 50 and Figure 51As shown, 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 during use, it can alleviate the phenomenon of the heat exchange medium entering the cavity 30b and causing the weight of the partition 33 to increase, 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 improving the performance of the battery 100.

[0524] 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.

[0525] 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.

[0526] In some embodiments, reference Figure 47 and Figure 48 The partition 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 direction 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.

[0527] The cavity 30a and the cavity 30b are both disposed inside the main body plate 331. Figure 48 In the figure, the cavity 30a and the cavity 30b both extend along the length direction of the main plate 331, and the two ends of the cavity 30a respectively pass through the two ends of the main plate 331, so that the cavity 30a can be connected with the medium inlet 3412 of the first conduit 341 and the medium outlet 3422 of the second conduit 342.

[0528] 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.

[0529] In some embodiments, as Figures 48-51 As shown, the main plate 331 is provided with a channel 3151 therein, which passes 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, which is connected to the main plate 331 and blocks both ends of the channel 3151 to form the cavity 30b.

[0530] 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.

[0531] 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.

[0532] In some embodiments, see Figures 48-51As shown, 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 of the blocking member 318. 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.

[0533] 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.

[0534] It should be noted that in Figures 48-51 In the embodiment, the cavity 30b is a closed structure formed by a blocking member 318 blocking the channel 3151 inside the main body plate 331. In other embodiments, see Figure 50 As shown, the cavity 30b can also be a structure formed by integrally molding the main plate 331, that is, the cavity 30b is a structure with a cavity inside formed by the main plate 331 through casting or stamping processes, that is, the sealing member 318 and the main plate 331 are an integrated structure.

[0535] 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.

[0536] 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.

[0537] 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.

[0538] 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.

[0539] 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 .

[0540] 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.

[0541] In some embodiments, see Figure 47 and Figure 48 As shown, 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 (ie, the third direction z) of the main plate 331.

[0542] Among them, the partition 33 is provided with a cavity 30a and multiple cavities 30b, the cavity 30a corresponds to multiple flow channels 30c, the cavity 30b and the flow channels 30c both extend along the length direction of the main plate 331, and the multiple cavities 30b and the multiple flow channels 30c are all arranged along the width direction of the main plate 331. There are many ways to arrange the multiple cavities 30b and the multiple flow channels 30c. For example, the cavities 30b and the flow channels 30c can be arranged alternately, or along the width direction of the main plate 331, the multiple cavities 30b are located on one side of the multiple flow channels 30c, or along the width direction of the main plate 331, the middle position of the main plate 331 is provided with multiple cavities 30b, and the flow channels 30c are provided on both sides of the multiple cavities 30b. Exemplarily, in Figure 48 In the middle of the main plate 331 , two flow channels 30 c are provided along the width direction of the main plate 331 , and three cavities 30 b are provided on both sides of the two flow channels 30 c , and a flow channel 30 c is provided at both ends of the main plate 331 .

[0543] 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.

[0544] In some embodiments, see Figure 48 and Figure 49 As shown, 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 .

[0545] The 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, Figure 48 and Figure 49 In the embodiment, two flow channels 30c are provided in the middle position of the main plate 331 along the width direction of the main plate 1. Of course, in other embodiments, one, three or four flow channels 30c can also be provided in the middle position of the main plate 331 along the width direction of the main plate 331.

[0546] 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 .

[0547] In some embodiments, reference Figure 51 , Figure 51 The following is a cross-sectional view of a main plate 331 of a partition 33 provided in some embodiments of the present application. The partition 33 is provided with a plurality of flow channels 30c and a plurality of cavities 30b. Along the width direction of the main plate 331, the cavities 30b and the flow channels 30c are alternately arranged.

[0548] 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.

[0549] 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.

[0550] In some embodiments, see Figure 49 As shown, 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.

[0551] 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%.

[0552] 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.

[0553] In some embodiments, see Figure 46 and Figure 47As shown, the cavities 30a of the multiple separators 33 are connected in series, that is, the medium inlet 3412 of one separator 33 is connected to the medium outlet 3422 of another separator 33. Of course, the flow channels 30c of the multiple separators 33 can also be connected in parallel, that is, the medium inlets 3412 of the multiple separators 33 are connected to each other, and the medium outlets 3422 of the multiple separators 33 are connected to each other. The battery 100 is provided with multiple separators 33, which helps to improve the thermal management capability of the separators 33 for the battery cells 20 in this battery 100, thereby reducing safety risks caused by internal temperature rise in the battery 100.

[0554] In some embodiments, see Figure 46 and Figure 47 As shown, the medium outlet 3422 of one partition 33 is communicated with the medium inlet 3412 of another partition 33 .

[0555] 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.

[0556] 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.

[0557] 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.

[0558] 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.

[0559] 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.

[0560] 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.

[0561] 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.

[0562] 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.

[0563] In some embodiments, as Figure 24 As shown, a separator 335 is provided in the cavity 30a, and the separator 335 is used to separate the cavity 30a into at least two flow channels 30c, 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.

[0564] For example, the plurality of flow channels 30 c may be sequentially arranged along the third direction z, each flow channel 30 c extends along the second direction y, and the third direction is perpendicular to the second direction and parallel to the first wall 201 .

[0565] 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.

[0566] 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.

[0567] Of course, only one flow channel 30c may be formed in the cavity 30a.

[0568] 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.

[0569] Further, see Figure 20 and Figure 21 The partition 33 further includes a manifold 332, and the manifold 332 includes a manifold chamber 332a ( Figure 26 、 Figure 28 ), the manifold chamber 332a is connected to a plurality of flow channels 30c, the insulating layer 32 includes a second insulating layer 32b, at least a portion of the second insulating layer 32b is disposed between the manifold 332 and the battery cell 20 to insulate and isolate the battery cell 20 and the manifold 332.

[0570] “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 .

[0571] The two manifolds 332 at both ends of the partition 33 may be respectively a first manifold 341 and a second manifold 342 .

[0572] 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.

[0573] 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 z 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.

[0574] 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 z, and the second current bus 342 extends along the third direction z.

[0575] 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 z 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.

[0576] In other embodiments, Figure 27 、 Figure 29 As shown, the insulating layer 32 may not cover the outer surface of the second current bus 342 .

[0577] 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.

[0578] 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.

[0579] Please refer to Figure 20 、 Figure 21 、 Figure 25 and Figure 26In 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 communicating with 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 communicating with the medium outlet 3422 is formed inside the second conduit 342; the first conduit chamber 3411 and the second conduit chamber 3421 are both communicated with each flow channel 30c.

[0580] 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.

[0581] 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.

[0582] 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.

[0583] In some embodiments, as Figure 25 and Figure 26 As shown, 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.

[0584] h3 / h2 can be 0.01, 0.015, 0.1, 0.15, 0.2, 0.25, 0.3, 0.35, 0.4, etc.

[0585] 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.

[0586] In some embodiments, please refer to Figure 20 、 Figure 21 、 Figure 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.

[0587] 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 . Figure 20 and Figure 21 3 shows a case where the medium inlet 3412 is provided with a first flow guide pipe 343 and the medium outlet 3422 is provided with a second flow guide pipe 344 .

[0588] like Figure 20 、 Figure 21 、 Figure 25-29 As shown, in the case where the insulating layer 32 partially covers the outer surface of the first flow conduit 343, the insulating layer 32 may only cover a portion of the outer surface of the first flow conduit 343. For example, the insulating layer 32 only covers the outer peripheral surface 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 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 first flow conduit 343 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 first flow conduit 343. In other embodiments, such as Figure 25 As shown, the insulating layer 32 may not cover the outer surface of the first flow guiding tube 343 .

[0589] like Figure 20 、 Figure 21 、 Figure 25-29As shown, in the case where 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 end surfaces of the second flow conduit 344 along the axial 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 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.

[0590] In other embodiments, the insulating layer 32 may not cover the outer surface of the second flow guiding tube 344 .

[0591] like Figure 20 、 Figure 21 、 Figure 25-29 As shown, the first flow guiding tube 343 and the second flow guiding tube 344 are coaxially arranged, and the axial direction of the first flow guiding tube 343 and the axial direction of the second flow guiding tube 344 are both parallel to the second direction y.

[0592] like Figure 20 、 Figure 21 、 Figure 25-29 As shown, one end of the first flow guide tube 343 is inserted into the medium inlet 3412 on the first flow collector 341 and welded to the first flow collector 341. One end of the second flow guide tube 344 is inserted into the medium outlet 3422 on the second flow collector 342 and welded to the second flow collector 342.

[0593] 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.

[0594] 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.

[0595] 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 .

[0596] 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.

[0597] 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 z is perpendicular to the second direction y.

[0598] 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.

[0599] like Figure 20 As shown, the main plate 331 extends beyond both ends of the battery cells 20 along the second direction y. The first busbar 341 and the 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.

[0600] 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 .

[0601] 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.

[0602] In some embodiments, as Figures 52-64 As shown, the heat conducting member 3a includes a first heat conducting plate 3331, a second heat conducting plate 3332 and a separator 335 which are stacked together. The separator 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 separator 335 jointly define a first flow channel 34, and the second heat conducting plate 3332 and the separator 335 jointly define a second flow channel 35.

[0603] 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.

[0604] 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.

[0605] 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.

[0606] 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.

[0607] 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 .

[0608] 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.

[0609] 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).

[0610] like Figure 53 and Figure 54 As shown, a thermal conductor 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.

[0611] 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.

[0612] like Figure 53 and Figure 54 As shown, 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. 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).

[0613] 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.

[0614] 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.

[0615] 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 an 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 z, with each first flow channel 34 extending along the second direction y. The third direction z is perpendicular to the second direction y. In an 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 z, with each second flow channel 35 extending along the second direction y.

[0616] 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.

[0617] 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.

[0618] There are many ways to form the first flow channel 34. In some embodiments, for example, Figures 55-59As shown, the partition 335 is provided with a first groove 3351 , which forms part of the first flow channel 34 .

[0619] “The first groove 3351 forms a portion of the first flow channel 34” means that the groove wall of the first groove 3351 serves as a portion of the wall of the first flow channel 34. The first groove 3351 has various forms, for example, Figure 56 As shown, 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 to each other, and the first groove 3351 is provided on the first surface 3352 and is recessed in a direction close to the second surface 3353. For another example, Figure 58 As shown, the first groove 3351 is set on the first surface 3352 , and the first groove 3351 is recessed from the first surface 3352 toward 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 .

[0620] 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.

[0621] 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.

[0622] like Figures 55-58 As shown, 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 the first flow channel 34 .

[0623] 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.

[0624] 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.

[0625] 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.

[0626] 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.

[0627] There are many ways to form the second flow channel 35, such as Figures 55-58 As shown, 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 .

[0628] “The second groove 3355 forms a portion of the second flow channel 35” means that the groove wall of the second groove 3355 serves as a portion of the wall of the second flow channel 35. The second groove 3355 has various forms, for example, Figure 55 As shown, along the stacking direction of the first heat conducting plate 3331, the second heat conducting plate 3332 and the separator, the second groove 3355 is provided on the second surface 3353 and is recessed toward the direction close to the first surface 3352. Figure 57 As shown, the second groove 3355 is set on the second surface 3353, and the second groove 3355 is recessed from the second surface 3353 toward the first surface 3352, and a second protrusion 3356 is formed at a position of the first surface 3352 corresponding to the second groove 3355.

[0629] 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.

[0630] 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.

[0631] like Figures 55-58 As shown, 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 the second flow channel 35 .

[0632] 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.

[0633] 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.

[0634] 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.

[0635] Please continue to refer to Figures 55-58 In the embodiment where there are multiple first flow channels 34, there are multiple first grooves 3351, and the multiple first grooves 3351 are arranged along the third direction z, 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 first heat conducting plate 3331 blocks the notches of the multiple first grooves 3351 facing the first heat conducting plate 3331, thereby forming multiple first flow channels 34.

[0636] 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 the third direction z, 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 slots of the multiple second grooves 3355 facing the second heat conducting plate 3332, thereby forming multiple second flow channels 35.

[0637] 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.

[0638] 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.

[0639] Please refer to Figures 55-58 , the first grooves 3351 and the second grooves 3355 are alternately arranged along the third direction z.

[0640] “The first grooves 3351 and the second grooves 3355 are alternately arranged in the third direction z” 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 z; 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 z, so that the first flow channel 34 and the second flow channel 35 are alternately arranged in the third direction z.

[0641] Figure 55-56 3 shows a situation in which the projection of each second groove 3355 on the first surface 3352 is entirely located between two adjacent first grooves 3351 along the stacking direction of the first heat conducting plate 3331 , the second heat conducting plate 3332 and the partition. Figure 57-58 It shows that along the stacking direction of the first heat conducting plate 3331, the second heat conducting plate 3332 and the partition, a portion of the projection of each second groove 3355 on the first surface 3352 along the third direction z 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 z overlaps with the first groove 3351.

[0642] The first groove 3351 and the second groove 3355 are alternately arranged along the third direction z, so that the first flow channel 34 and the second flow channel 35 are alternately arranged along the third direction z. 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 along the third direction z is relatively uniform, and the temperature distribution of the battery cell 20 corresponding to the second flow channel 35 along the third direction z is relatively uniform.

[0643] Please refer to Figures 57-59 In some embodiments, the partition 335 is a corrugated plate, which has a simple structure and is easy to manufacture.

[0644] 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 the third direction z, and the first convex portion 3354 and the second convex portion 3356 are alternately arranged along the third direction z, thereby forming a corrugated plate.

[0645] In other embodiments, the separator 335 may also be a component of other structural forms, such as Figure 55 and Figure 56 shown.

[0646] like Figure 60 As shown, the first flow channel 34 can also be formed in other forms. For example, in other embodiments, the partition 335 includes a main body portion 3357 and a first partition portion 3358, and the two ends of the first partition portion 3358 along the first direction x are respectively connected to the main body portion 3357 and the first heat conduction plate 3331, and the main body portion 3357, the first partition portion 3358 and the first heat conduction plate 3331 jointly define the first flow channel 34.

[0647] 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.

[0648] 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.

[0649] 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 portion 3359, and the two ends of the second partition portion 3359 along the second direction Z are respectively connected to the main body portion 3357 and the second heat conducting plate 3332. The main body portion 3357, the second partition portion 3359 and the second heat conducting plate 3332 jointly define a second flow channel 35.

[0650] 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.

[0651] 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.

[0652] 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.

[0653] 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.

[0654] 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.

[0655] 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 .

[0656] For example, Figure 61 As shown, in an embodiment in which 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.

[0657] 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.

[0658] like Figure 62 As shown, in some embodiments, the heat conducting member 3 a includes a communication cavity 36 located at one end of the partition 335 , the first flow channel 34 is in communication with the communication cavity 36 , and the second flow channel 35 is in communication with the communication cavity 36 .

[0659] 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.

[0660] 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.

[0661] There can be multiple first flow channels 34 and multiple second flow channels 35. In an embodiment where there are multiple first flow channels 34, all first flow channels 34 can be connected to the connecting cavity 36. In this case, 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. 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 portion of the multiple first flow channels 34 is not connected to the connecting cavity 36. The fluid medium in these first flow channels 34 cannot enter the second flow channel 35. Figure 62 The direction indicated by the hollow arrow in FIG. 3 is the flow direction of the fluid medium in the first flow channel 34 and the second flow channel 35 .

[0662] 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.

[0663] 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 .

[0664] The number of the first flow channels 34 and the number of the second flow channels 35 may be the same or different.

[0665] 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.

[0666] Please refer to Figure 25 、 Figure 26 、 Figure 62 、 Figure 63 In some embodiments, the heat conducting member 3 a includes a medium inlet 3412 and a medium outlet 3422 . The medium inlet 3412 is connected to the communication cavity 36 through the first flow channel 34 , and the medium outlet 3422 is connected to the communication cavity 36 through the second flow channel 35 .

[0667] 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 .

[0668] The fluid medium enters the first flow channel 34 from the medium inlet 3412, flows into the second flow channel 35 through the communication cavity 36, and is discharged from the medium outlet 3422. The fluid medium exchanges heat with the battery cell 20 during the flow process. Figure 62 and Figure 63 The directions indicated by the hollow arrows in FIG. 3 are the flow directions of the fluid medium in the first flow channel 34 and the second flow channel 35 .

[0669] 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.

[0670] Please refer to Figure 62 、 Figure 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.

[0671] The extending direction of the first flow channel 34 and the extending direction of the second flow channel 35 are both parallel to the second direction y. In other embodiments, the extending direction of the first flow channel 34 and the extending direction of the second flow channel 35 may be different. For example, the extending direction of the first flow channel 34 is parallel to the second direction y, and the extending 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.

[0672] 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.

[0673] 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.

[0674] like Figure 62 、 Figure 63 As shown, in some embodiments, one end of the first flow channel 34 away from the communication cavity 36 along its extension direction and one end of the second flow channel 35 away from the communication cavity 36 along its extension direction are not connected to each other.

[0675] In this embodiment, the extending direction of the first flow channel 34 and the extending 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. Figure 63 As shown, the heat conducting member 3a further includes a blocking member 39 (or a blocking member), which is disposed 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, thereby preventing 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 disposed 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, thereby preventing 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.

[0676] 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.

[0677] 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 .

[0678] 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.

[0679] 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 .

[0680] 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.

[0681] 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.

[0682] In the embodiment where there are multiple first flow channels 34, the number of medium inlets 3412 can be set differently. For example, please refer to Figure 53 、 Figure 63 In some embodiments, there is one medium inlet 3412 , and each first flow channel 34 connects the communication cavity 36 and the medium inlet 3412 .

[0683] In the embodiment where the blocking member 39 blocks the end of the second flow channel 35 away from the communicating cavity 36, as shown in FIG. Figure 63 As shown, 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 is connected to each first flow channel 34 through the diversion gap 310. The fluid medium flowing in from the medium inlet 3412 enters the diversion gap 310 and is then distributed to each first flow channel 34 from the diversion gap 310.

[0684] 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.

[0685] 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 .

[0686] 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.

[0687] In the embodiment where the second flow channel 35 is multiple, as shown in FIG. Figure 52 As shown, there are multiple medium outlets 3422 , and each second flow channel 35 is connected to the communication cavity 36 and one medium outlet 3422 .

[0688] 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 .

[0689] 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 .

[0690] 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.

[0691] In some embodiments, the divider 335 is an integrally formed structure.

[0692] 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.

[0693] 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.

[0694] 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 .

[0695] 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.

[0696] 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 (see Figure 58 ), such a connection method enables the separator 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.

[0697] 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.

[0698] like Figure 64 As shown, the battery 100 includes an adjacent first battery cell 21, a second battery cell 22 and a heat conductive member 3a, the heat conductive member 3a is arranged between the first battery cell 21 and the second battery cell 22, the first heat conductive plate 3331 is thermally connected to the first battery cell 21, and the second heat conductive plate 3332 is thermally connected to the second battery cell 22.

[0699] 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 .

[0700] 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.

[0701] 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.

[0702] Please continue to refer to Figure 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 .

[0703] 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.

[0704] 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.

[0705] 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.

[0706] 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.

[0707] In some embodiments, as Figures 65-82 As shown, at least a portion of the heat conducting member 3 a is configured to be deformable when under pressure, so that the heat conducting member 3 a provides a certain expansion space for the battery cell 20 , which is beneficial to reducing the squeezing force between the heat conducting member 3 a and the battery cell 20 .

[0708] In some embodiments, as Figure 65 As shown, 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.

[0709] 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.

[0710] The compressible layer 500 is a layered structure that undergoes a large compression deformation after being subjected to an applied force.

[0711] 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.

[0712] 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.

[0713] 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.

[0714] As an example, Figure 66 As shown, the heat conducting member 3a includes a heat exchange layer 400 and a compressible layer 500; Figure 67 As shown, the heat conducting member 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; Figure 68 As shown, the heat conducting element 3 a 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 .

[0715] 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.

[0716] 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 .

[0717] In some embodiments, the compressible cavity 501 is filled with a phase change material or an elastic material.

[0718] 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.

[0719] Elastic materials refer to materials with a low elastic modulus, and elastic materials can undergo significant deformation under the expansion force of battery cells.

[0720] 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.

[0721] Optionally, the elastic material comprises a rubber material.

[0722] 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.

[0723] Optionally, the heat exchange chamber 401 may be sealed or open.

[0724] In some embodiments, as Figure 69 As shown, a first support member 410 (also referred to as the reinforcing ribs 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.

[0725] Optionally, the elastic modulus of the first support member 410 is greater than the elastic modulus of the compressible layer 500 .

[0726] 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.

[0727] 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.

[0728] 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.

[0729] In some embodiments, see Figure 67 , the compressible layer 500 is arranged in the heat exchange cavity 401.

[0730] 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.

[0731] In some embodiments, as Figure 70 As shown, the heat exchange cavity 401 is further provided with a first connection structure 420 (also referred to as the first reinforcing rib mentioned above) for fixing the compressible layer 500 in the heat exchange cavity 401 .

[0732] 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.

[0733] 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.

[0734] 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 ).

[0735] 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.

[0736] Optionally, a plurality of first connection structures 420 are provided in the heat exchange cavity 401 .

[0737] Optionally, the elastic modulus of the first connection structure 420 is greater than the elastic modulus of the compressible layer 500 .

[0738] In some embodiments, see Figure 71-74 The compressible layer 500 includes a first compressible tube 510 , and the heat exchange layer 400 includes a first heat exchange tube 430 . The first compressible tube 510 is sleeved in the first heat exchange tube 430 .

[0739] The first compressible tube 510 is a tubular structure having a compressible cavity 501 therein and capable of being squeezed and deformed.

[0740] 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.

[0741] 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.

[0742] 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 .

[0743] 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.

[0744] 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.

[0745] 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.

[0746] In some embodiments, optionally, see Figure 68 , the heat exchange layer 400 is arranged in the compressible cavity 501.

[0747] 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.

[0748] In some embodiments, the compressible layer 500 includes thermally conductive walls that define a compressible cavity 501 .

[0749] The heat-conducting wall is a wall structure of the compressible layer 500 that has a good heat-conducting effect.

[0750] As an example, the material of the heat-conducting wall may be heat-conducting silicone, metal, etc.

[0751] 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.

[0752] In some embodiments, see Figures 75-78 , Figure 75 This is a schematic structural diagram of the second heat exchange tube in some embodiments of the present application. Figure 76 This is a schematic structural diagram of the second compressible tube in some embodiments of the present application. Figure 77 is a side view of the second compressible tube of some embodiments of the present application, Figure 78 The diagram is a schematic diagram of the assembled structure of the second compressible tube and the second heat exchange tube in some embodiments of the present application. The compressible layer 500 includes the second compressible tube 520 , and the heat exchange layer 400 includes the second heat exchange tube 440 . The second heat exchange tube 440 is sleeved in the second compressible tube 520 .

[0753] The second heat exchange tube 440 is a tubular structure having a heat exchange cavity 401 therein.

[0754] 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.

[0755] 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.

[0756] 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 .

[0757] 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.

[0758] 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.

[0759] 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.

[0760] Optionally, a plurality of second support members 450 are disposed inside the second heat exchange tube 440 .

[0761] 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 .

[0762] Optionally, the elastic modulus of the second support member 450 is greater than the elastic modulus of the compressible layer 500 .

[0763] In some embodiments, see Figure 65 、 Figure 79 and Figure 80 The heat conducting member 3 a further includes a current collecting element 106 , which includes a liquid flow cavity 1061 . The liquid flow cavity 1061 is connected to the heat exchange cavity 401 . Both the liquid flow cavity 1061 and the heat exchange cavity 401 are sealed and isolated from the compressible cavity 501 .

[0764] The current collecting element 106 is a component that connects the heat exchange layer 400 and the container storing the heat exchange medium.

[0765] The liquid flow cavity 1061 is a cavity in the flow collecting element 106 that communicates with the heat exchange cavity 401 and the container storing the heat exchange medium.

[0766] The collecting element 106 can be used to connect the container for storing the heat exchange medium, so that the heat exchange medium in the heat exchange chamber 401 can flow. The compressible chamber 501 and the heat exchange chamber 401 are not connected, so that the heat exchange medium cannot enter the compressible chamber 501, thereby preventing the compressible chamber 501 from deforming after being subjected to the expansion force released by the battery cell 20, causing the heat exchange medium to overflow.

[0767] Optionally, the current collecting element 106 further includes a liquid inlet and outlet 1062 , and the liquid inlet and outlet 1062 is connected to the liquid flow cavity 1061 .

[0768] Optionally, the heat conducting member 3a includes a current collecting element 106, which is disposed at one end of the heat exchange layer 400. The heat exchange layer 400 is open at one end, and the liquid flow cavity 1061 is connected to the heat exchange cavity 401 through the opening at one end.

[0769] Optionally, the heat conducting member 3a includes two current collecting elements 106, which are respectively arranged at both ends of the heat exchange layer 400. The heat exchange layer 400 has openings at both ends, and the two liquid flow chambers 1061 are respectively connected to the heat exchange chamber 401 through the openings at both ends.

[0770] Optionally, the heat conducting member 3 a further includes a connecting member, which is a hollow structure, and one end of the connecting member is opened and sealed to the liquid inlet and outlet 1062 .

[0771] See also Figure 64 and 84 , Figure 81 Figure 3 is a schematic diagram of the structure of the heat conductor 3a and battery cells 20 assembled in some embodiments of the present application. When the heat conductor 3a is used in the battery 100, it can be placed between two adjacent battery cells 20, with its two opposing surfaces respectively contacting the two adjacent large surfaces of the two adjacent battery cells 20. The heat conductor 3a can also be placed between the housing 10 and the battery cells 20 adjacent to the housing 10.

[0772] Each heat-conducting element 3 a can be connected to a heat exchange medium storage container individually, or the liquid inlets and outlets 1062 of adjacent heat-conducting elements 3 a can be connected via pipes 107 .

[0773] In some embodiments, see Figure 65 and Figure 82 The heat exchange layer 400 and the compressible layer 500 are extended along the second direction 33 , and at least one end of the compressible layer 500 along the second direction 33 protrudes from the heat exchange layer 400 .

[0774] The compressible layer 500 protruding from the heat exchange layer 400 is beneficial for sealing and isolating the liquid cavity 1061 of the current collecting element 106 from the compressible cavity 501, so that the heat exchange medium cannot enter the compressible cavity 501, thereby preventing the compressible cavity 501 from deforming after being subjected to the expansion force released by the battery cell, thereby preventing the heat exchange medium from overflowing.

[0775] Optionally, the compressible layer 500 is disposed in the heat exchange cavity 401, and the current collecting element 106 includes a through hole extending along the second direction y. The portion of the compressible layer 500 protruding from the heat exchange layer 400 passes through the through hole and is sealed to one end of the through hole, while the other end of the through hole is sealed to the outer wall of the heat exchange layer 400. A liquid flow cavity 1061 is defined between the outer wall of the portion of the compressible layer 500 protruding from the heat exchange layer 400 and the inner wall of the current collecting element 106.

[0776] In some embodiments, optionally, see Figure 65 The compressible chamber 501 is provided with an air inlet 502 and an air outlet 503 .

[0777] The compressible layer 500 can be air-cooled through the air inlet 502 and the air outlet 503 , and cooperates with the heat exchange layer 400 to further improve the heat exchange efficiency of the heat conductor 3 a for the battery.

[0778] In some embodiments, as Figures 83-92 As shown, the heat conductor 3a includes a shell 50 and a support component 60. The support component 60 is accommodated in the shell 50 and is used to define a separate cavity 30a and a deformation cavity 40a in the shell 50. The cavity 30a is used for the flow of heat exchange medium, and the deformation cavity 40a is configured to be deformable when the shell 50 is under pressure.

[0779] Thus, the battery cell 20 is heated or cooled by the heat exchange medium in the cavity 30a. When the battery cell 20 inside the box body 10 expands during use, since the shell 50 has a deformation cavity 40a inside, the shell 50 can be deformed when subjected to the force of the battery cell 20, thereby preventing the shell 50 of the heat conductor 3a from reacting too much on the battery cell 20, absorbing the tolerance of the battery cell 20 grouping, avoiding damage to the battery cell 20, reducing the reduction in the heat exchange area between the heat conductor 3a and the battery cell 20, and improving the cycle performance of the battery cell 20.

[0780] The heat conducting member 3 a may be disposed at the bottom or side of the box body to be in full contact with the battery cells 20 , or may be disposed between two adjacent battery cells 20 .

[0781] The two ends of the cavity 30a are open to allow the flow of heat exchange medium. The heat exchange medium gives the cavity 30a a certain strength and generally does not deform due to compression. The two ends of the deformation cavity 40a are sealed to prevent the heat exchange medium from entering the deformation cavity 40a. The deformation cavity 40a accounts for 10%-90% of the volume and is therefore prone to deformation. The shell 50 and the support component 60 can be made of the same material through an integrated molding process. The shell 50 can also be made of a material with greater elasticity than the support component 60, so that the deformation cavity 40a can deform when the shell 50 is subjected to the expansion force of the battery cell 20.

[0782] Optionally, the battery cell 20 is located between two adjacent heat-conducting members 3 a , and the multiple heat-conducting members 3 a are connected by connecting pipes to achieve connection between the heat-conducting members 3 a and circulation of the heat exchange medium.

[0783] In some embodiments, the support member 60 and the housing 50 enclose a cavity 30a. The support member 60 can be connected to the housing 50 to form a cavity 30a. The number of cavities 30a can be multiple, and multiple cavities 30a are adjacent or spaced apart to fully exchange heat for the battery cells 20.

[0784] In the above solution, the housing 50 is configured to be in direct contact with the battery cell 20 , and the support component 60 and the housing 50 together enclose a cavity 30 a . The heat exchange medium can contact the battery cell 20 through the housing 50 , thereby improving the heat exchange efficiency of the battery cell 20 .

[0785] like Figure 86 and Figure 88 As shown, the support component 60 includes a partition component 61 and a support component 62. The partition component 61 is used to define a separated cavity 30a and a deformation cavity 40a in the shell 50; the support component 62 is used to be set in the cavity 30a or to jointly define the cavity 30a with the partition component 61 to support the cavity 30a.

[0786] The partition assembly 61 is connected to the support assembly 62, and each is connected to the housing 50 to define the cavity 30a and the deformation cavity 40a. The support assembly 62 can be disposed within the cavity 30a to support the cavity 30a, or the support assembly 62 can serve as a side of the cavity 30a, connected to the housing 50 and the partition assembly 61 to enclose the cavity 30a, thereby also supporting the cavity 30a.

[0787] In the above scheme, the interior of the shell 50 is divided into a cavity 30a and a deformation cavity 40a by the partition component 61, and the cavity 30a is supported by the support component 62, thereby improving the strength of the cavity 30a, so that when the heat conductor 3a absorbs expansion and tolerance, the volume inside the cavity 30a is prevented from decreasing, the flow rate of the heat exchange medium inside the cavity 30a is changed, and the heat exchange medium is prevented from overflowing. At the end of the battery life cycle, the cavity 30a will not be crushed and blocked.

[0788] The outer shell 50 includes a first side wall 50a (for example, it can also be referred to as the first heat conducting plate 3331 described above) and a second side wall 50b (for example, it can also be referred to as the second heat conducting plate 3332 described above), and the second side wall 50b is arranged opposite to the first side wall 50a along a first direction x (which can be the thickness direction of the heat conducting member 3a), and the partition component 61 is respectively connected to the first side wall 50a and the second side wall 50b.

[0789] The first side wall 50a and the second side wall 50b can be configured as the side walls with the largest area of ​​the heat conductive member 3a. The heat conductive member 3a can be set at the bottom or side of the box body 10, and the first side wall 50a or the second side wall 50b is in contact with the battery cell 20 to fully exchange heat with the battery cell 20; the heat conductive member 3a can also be set between two adjacent battery cells 20, and the first side wall 50a and the second side wall 50b are in contact with two adjacent battery cells 20 respectively, so as to be able to exchange heat with different battery cells 20 and improve the heat exchange efficiency of the battery.

[0790] In the above solution, the partition component 61 (for example, also referred to as the first reinforcing rib mentioned above) is connected to the first side wall 50a and the second side wall 50b respectively, which can strengthen the connection strength between the first side wall 50a and the second side wall 50b and improve the overall strength of the heat conductor 3a.

[0791] like Figure 89 and Figure 90 As shown, the partition assembly 61 includes a first bending plate 611 and a second bending plate 612. The first bending plate 611 is connected to the first side wall 50a; the second bending plate 612 is connected to the second side wall 50b. The first bending plate 611 and the second bending plate 612 define a deformation cavity 40a.

[0792] The first bending plate 611 is connected to the first side wall 50a, and can define a deformation cavity 40a close to the first side wall 50a; the second bending plate 612 is connected to the second side wall 50b, and can define a deformation cavity 40a close to the second side wall 50b; or the deformation cavity 40a is formed between the first bending plate 611 and the second bending plate 612.

[0793] In the above scheme, the first bending plate 611 and the second bending plate 612 both have a bent shape. The first bending plate 611 and the second bending plate 612 can define a larger deformation cavity 40a, ensuring the deformation space of the heat conductor 3a and improving the space utilization inside the shell 50.

[0794] In some embodiments, the support assembly 62 includes a first support rib 621 and a second support rib 622. The first support rib 621 is respectively connected to the first bending plate 611 and the second side wall 50b; the second support rib 622 is respectively connected to the second bending plate 612 and the first side wall 50a.

[0795] The first support rib 621 and the second support rib 622 can be respectively located in the cavity 30a, or can serve as the side of the cavity 30a, and both can support the cavity 30a. The first support rib 621 improves the connection strength between the first bent plate 611 and the outer shell 50, and the second support rib 622 improves the connection strength between the second bent plate 612 and the outer shell 50. Moreover, the first support rib 621 and the second support rib 622 both improve the strength of the cavity 30a. When the heat conductor 3a is compressed by the expansion force of the battery cell 20, the first support rib 621 and the second support rib 622 can prevent the cavity 30a from being deformed, thereby ensuring that the internal volume of the cavity 30a does not change and the heat exchange medium does not overflow. At the same time, at the end of the battery's life cycle, it can prevent the cavity 30a from being crushed and blocked, resulting in failure of thermal performance.

[0796] In such Figure 90 and Figure 91 In the embodiment shown, both ends of the first bent plate 611 are connected to the first side wall 50a, and both ends of the second bent plate 612 are connected to the second side wall 50b; in the first direction x, the first bent plate 611 and the second bent plate 612 are staggered, and a cavity 30a is formed between the first support rib 621 and the second support rib 622.

[0797] The first bent plate 611 is connected to the first side wall 50a to form a deformation cavity 40a near the first side wall 50a. The second bent plate 612 is connected to the second side wall 50b to form a deformation cavity 40a near the second side wall 50b. The cavity 30a is located between the two deformation cavities 40a. Multiple cavities 30a are arranged adjacent to each other. The first support ribs 621 and the second support ribs 622 jointly support the cavities 30a, thereby enhancing the strength of the cavities 30a. The first and second side walls 50a, 50b, respectively, can contact two adjacent battery cells 20, allowing both the first and second side walls 50a, 50b, to deform at locations corresponding to the deformation cavities 40a. This allows the thermal conductive element 3a to simultaneously absorb the expansion of both battery cells 20. The first and second side walls 50a, 50b, are the largest side walls of the housing 50 and contact the largest side portions of the battery cells 20, enhancing their ability to absorb expansion.

[0798] In some embodiments, there are multiple first bent plates 611, and there is a preset distance between two adjacent first bent plates 611. The first side wall 50a includes a first gap L1 between the two adjacent first bent plates 611. The cavity 30a can contact the battery cell 20 abutting against the first side wall 50a through the first gap L1, thereby increasing the contact area of ​​the battery cell 20 abutting against the first side wall 50a and increasing the heat exchange efficiency.

[0799] In some embodiments, there are multiple second bent plates 612, and there is a preset distance between two adjacent second bent plates 612. The second side wall 50b includes a second gap L2 between two adjacent second bent plates 612. The cavity 30a can contact the battery cell 20 abutting against the second side wall 50b through the second gap L2, thereby increasing the contact area of ​​the battery cell 20 abutting against the second side wall 50b and increasing the heat exchange efficiency.

[0800] In other embodiments, there are multiple first bending plates 611, and a...

Claims

1. A battery, characterized in that: include: A box body, wherein the box body has a containing cavity; 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, and the battery cell includes a first wall, which is the wall with the largest area in the battery cell; A heat-conducting member for accommodating a heat exchange medium, the heat-conducting member being arranged in the accommodating cavity, the heat-conducting member being heat-conductingly connected to the first wall, the heat exchange medium exchanging heat with the battery cell through the heat-conducting member to adjust the temperature of the battery cell; 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.

2. The battery according to claim 1, characterized in that 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, characterized in that 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, characterized in that The electrode terminal is disposed on the first wall.

5. The battery according to claim 4, characterized in that 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, characterized in that The first wall is formed in a cylindrical shape.

7. The battery according to claim 6, characterized in that 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, characterized in that 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, characterized in that At least one of the battery cells is a soft pack battery cell.

10. The battery according to claim 1, characterized in that 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 claim 1, characterized in that 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 claim 1, characterized in that The heat conducting member is bonded to the first wall via a first adhesive layer.

13. The battery according to claim 12, characterized in that 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, characterized in that 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, characterized in that 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 claim 13, characterized in that 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, characterized in that 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.

18. The battery according to claim 17, characterized in that 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.

19. The battery according to claim 18, characterized in that The thermal conductivity of the insulating layer is greater than or equal to 0.1 W / (m·K).

20. The battery according to claim 17, characterized in that 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.

21. The battery according to claim 17, characterized in that 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.

22. The battery according to claim 17, characterized in that The surface of the heat conducting member connected to the first wall is an insulating surface; Wherein, a dimension of the heat conducting member in a first direction is 0.1 mm to 100 mm, and the first direction is perpendicular to the first wall.

23. The battery according to claim 17, characterized in that 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.

24. The battery according to claim 17, characterized in that A cavity is arranged inside the partition.

25. The battery according to claim 24, characterized in that The cavity is used to accommodate a heat exchange medium to adjust the temperature of the battery cell.

26. The battery according to claim 24, characterized in that 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.

27. The battery according to claim 26, characterized in that The partition plate further includes reinforcing ribs, and the reinforcing ribs are arranged between the pair of heat conducting plates.

28. The battery according to claim 27, characterized in that The reinforcing rib is connected to at least one of the pair of heat conducting plates.

29. The battery according to claim 28, characterized in that 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.

30. The battery according to claim 29, characterized in that The included angle between the first reinforcing rib and the first direction is in the range of 30°-60°.

31. The battery according to claim 29, characterized in that 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.

32. The battery according to claim 31, characterized in that The second reinforcing rib extends along the first direction and protrudes from one of the pair of heat conducting plates.

33. The battery according to claim 31, characterized in that The first reinforcing rib and the second reinforcing rib are arranged at intervals.

34. The battery according to claim 26, characterized in that 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.

35. The battery according to claim 25, characterized in that 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.

36. The battery according to claim 24, characterized in that A partition is provided in the cavity, and the partition is used to divide the cavity into at least two flow channels.

37. The battery according to claim 36, characterized in that 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.

38. The battery according to any one of claims 1 to 16, characterized in that At least a portion of the thermally conductive member is configured to be deformable when subjected to pressure.

39. The battery according to claim 38, characterized in that 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.

40. The battery according to claim 39, characterized in that The compressible layer includes a compressible cavity filled with a phase change material or an elastic material.

41. The battery according to claim 38, characterized in that 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.

42. The battery according to claim 38, characterized in that 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.

43. The battery according to any one of claims 1 to 16, characterized in that 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.

44. The battery according to claim 43, characterized in that 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.

45. The battery according to claim 43, characterized in that 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.

46. ​​The battery according to any one of claims 1 to 16, characterized in that 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.

47. The battery according to claim 46, characterized in that The heat conducting member is sandwiched between two adjacent battery groups.

48. The battery according to claim 47, characterized in that 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.

49. The battery according to claim 48, characterized in that 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.

50. The battery according to any one of claims 1 to 16, characterized in that 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.

51. The battery according to claim 50, characterized in that 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.

52. The battery according to claim 51, characterized in that 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.

53. The battery according to claim 52, characterized in that The minimum thickness of the weak area is A1, satisfying: 1≤A1 / S1≤100.

54. The battery according to claim 51, characterized in that 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.

55. The battery according to claim 51, characterized in that The hardness of the weak area is B1, and the hardness of the non-weak area is B2, satisfying: 1<B1 / B2≤5.

56. The battery according to claim 51, characterized in that 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.

57. The battery according to any one of claims 1 to 16, characterized in that 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.

58. The battery according to claim 57, characterized in that Along the thickness direction of the support layer, the conductive layer is disposed on at least one side of the support layer.

59. The battery according to claim 57, characterized in that The room temperature film resistance R of the conductive layer S Satisfy: 0.016Ω / □≤R S ≤420Ω / □.

60. The battery according to claim 57, characterized in that The material of the conductive layer is selected from at least one of aluminum, copper, titanium, silver, nickel-copper alloy, and aluminum-zirconium alloy.

61. The battery according to claim 57, characterized in that The material of the support layer includes one or more of polymer materials and polymer-based composite materials.

62. The battery according to claim 57, characterized in that 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%.

63. The battery according to any one of claims 1 to 16, characterized in that 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.

64. The battery according to claim 63, characterized in that The shell includes at least one of the metal oxide and the inorganic salt, and carbon.

65. The battery according to any one of claims 1 to 16, characterized in that 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.

66. The battery according to claim 65, characterized in that 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.

67. The battery according to claim 66, characterized in that 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。 68. The battery according to claim 66, characterized in that 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.

69. The battery according to claim 65, characterized in that The positive electrode active material further has a coating layer.

70. The battery according to claim 69, characterized in that The coating layer includes carbon.

71. The battery according to claim 70, characterized in that The carbon in the coating layer is a mixture of SP2 carbon and SP3 carbon.

72. The battery according to claim 71, characterized in that The molar ratio of the SP2 carbon to the SP3 carbon is any value within the range of 0.1-10.

73. An electrical device, characterized in that: Comprising a battery according to any one of claims 1-72, the battery is used to provide electrical energy.

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