Batteries and power consumption devices

Abstract

A battery and a power consumption device, the battery including a housing, a battery cell, a thermally conductive member and a fixing member, the battery cell being accommodated in an accommodating cavity, the battery cell including a first wall and a second wall, an included angle being formed between the first wall and the second wall, the area of ​​the first wall being larger than the area of ​​the second wall, the thermally conductive member being provided in the accommodating cavity, the thermally conductive member being disposed opposite the first wall and being thermally conductively connected to the battery cell for heat exchange, and the fixing member being connected to the second wall and the housing, whereby the battery cell is fixed in the accommodating cavity.

Description

[Technical Field]

[0001] [Cross-reference of related applications] This application is an international patent application with application number PCT / CN2022 / 077152, filed on February 21, 2022; an international patent application with application number PCT / CN2022 / 077153, filed on February 21, 2022; an international patent application with application number PCT / CN2022 / 077151, filed on February 21, 2022; an international patent application with application number PCT / CN2022 / 077147, filed on February 21, 2022; an international patent application with application number PCT / CN2022 / 077149, filed on February 21, 2022; an international patent application with application number PCT / CN2022 / 077150, filed on International patent application filed on February 21, 2022, application number PCT / CN2022 / 098447; International patent application filed on June 13, 2022, application number PCT / CN2022 / 098727; International patent application filed on June 14, 2022, application number PCT / CN2022 / 099229; International patent application filed on June 16, 2022, application number PCT / CN2022 / 100488; International patent application filed on June 22, 2022, application number PCT / CN2022 / 100486; International patent application filed on June 22, 2022, application number PCT / C International patent application N2022 / 111347, filed on August 10, 2022; application number PCT / CN2022 / 099786, filed on June 20, 2022; application number PCT / CN2022 / 101392, filed on June 27, 2022; application number PCT / CN2022 / 101395, filed on June 27, 2022; application number PCT / CN2022 / 098355, filed on June 13, 2022; application number PCT / CN2022 / 077998, filed on February 25, 2022 International patent application, application number PCT / CN2022 / 098380, filing date June 13, 2022; International patent application, application number PCT / CN2022 / 098343, filing date June 13, 2022; International patent application, application number PCT / CN2022 / 098348, filing date June 13, 2022; International patent application, application number PCT / CN2022 / 098373, filing date June 13, 2022; International patent application, application number PCT / CN2022 / 098370, filing date June 13, 2022; International patent application, application number PCT / CN2022 / 077993,This application is filed based on the following international patent applications: application number PCT / CN2022 / 101440 filed on February 25, 2022; application number PCT / CN2022 / 101406 filed on June 27, 2022; application number PCT / CN2022 / 101414 filed on June 27, 2022; application number PCT / CN2022 / 101517 filed on June 27, 2022; application number PCT / CN2022 / 101393 filed on June 27, 2022; and claims priority to the above international patent applications, with the entire contents of the above international patent applications incorporated into this application by reference.

[0002] This application relates to battery technology, and more particularly to batteries and power consumption devices. [Background technology]

[0003] In recent years, the emergence of new energy vehicles has played a significant role in both social development and environmental protection. Rechargeable batteries serve as the power source for new energy vehicles and are widely applied in the field of new energy vehicles.

[0004] While battery energy density is a crucial parameter in battery performance, improving battery energy density also requires considering the battery's thermal management capabilities. Furthermore, conventional batteries have low rigidity and cannot directly withstand loads from other parts of a power-consuming device, making them prone to safety accidents and impacting the safety of the power-consuming device. [Overview of the project]

[0005] The object of this application is to solve at least one technical problem present in related technologies. To this end, this application provides a battery that can improve the energy density and safety of the battery, as well as effectively ensure heat conduction within the battery, thereby improving the thermal management performance of the battery.

[0006] The present invention further provides a power consumption device having the above-mentioned battery.

[0007] An embodiment of the first aspect of the present application includes a housing, a battery cell, a heat conductive member, and a fixing member, wherein the housing has a housing cavity, the battery cell is housed in the housing cavity, the battery cell includes a first wall and a second wall, and has an angle between the first wall and the second wall, the area of ​​the first wall is larger than the area of ​​the second wall, the heat conductive member is provided in the housing cavity, the heat conductive member is installed facing the first wall and is connected to the battery cell by heat conduction, and the fixing member is connected to the second wall and the housing, thereby fixing the battery cell in the housing cavity.

[0008] In the above technical solution, the battery cell is fixed within the housing cavity by a fixing member connecting the second wall and the housing, thereby improving the structural strength of the battery. At the same time, a heat conductive member is installed so as to make a heat conductive connection with the first wall of the battery cell. The heat conductive member is used to conduct heat from the battery cell, thereby ensuring heat conduction within the battery, effectively improving the safety of the battery, and effectively ensuring heat conduction within the battery, thereby improving the thermal management performance of the battery.

[0009] In some embodiments, the first wall is the wall with the largest area in the battery cell.

[0010] In some embodiments, the electrode terminals of the battery cell are installed on the second wall.

[0011] In some embodiments, the battery cell includes two opposing first walls and two opposing second walls, and at least two electrode terminals are provided, with at least two electrode terminals on the same second wall, or at least one electrode terminal on each second wall.

[0012] In some embodiments, the electrode terminals are provided on the first wall.

[0013] In some embodiments, the battery cells are multiple and arranged in a first direction, and in the first direction, each battery cell has a first surface that is installed facing the first wall. Having Relief grooves are provided on the first surface, and the relief grooves of one of the two adjacent battery cells are used to accommodate the electrode terminals of the other battery cell, and the first direction is perpendicular to the first wall.

[0014] In some embodiments, the first wall is formed in a cylindrical shape.

[0015] In some embodiments, second walls are provided at both axial ends of the first wall, and the electrode terminals are provided on at least one of the second walls.

[0016] In some embodiments, the exposed electrode terminal is provided on one of the second walls. , electric The electrode assembly includes a positive electrode sheet and a negative electrode sheet, one of which is electrically connected to the electrode terminal, and the other of which is electrically connected to the first wall or the other second wall.

[0017] In some embodiments, the battery cell further includes a third wall, the third wall being connected to the first wall and / or the second wall, and the electrode terminals being located on the third wall.

[0018] In some embodiments, the battery cell includes two opposing third walls, and at least two electrode terminals are provided, with at least two electrode terminals on the same third wall, or at least one electrode terminal on each third wall.

[0019] In some embodiments, the area of ​​the third wall is less than or equal to the area of ​​the first wall, and / or the area of ​​the third wall is less than or equal to the area of ​​the second wall.

[0020] In some embodiments, at least one of the battery cells is a softpack battery cell.

[0021] In some embodiments, the battery cell further includes a pressure reduction mechanism, and the pressure reduction mechanism and the electrode terminals of the battery cell are installed on the same wall of the battery cell.

[0022] In some embodiments, the battery cell further includes a pressure reduction mechanism, and the pressure reduction mechanism and the electrode terminals of the battery cell are installed on the two walls of the battery cell, respectively.

[0023] In some embodiments, the heat conductive member is bonded to the first wall via a first adhesive layer.

[0024] In some embodiments, the bottom of the heat conduction member is bonded to the bottom wall of the housing cavity via a second adhesive layer, and / or the fixing member includes a third adhesive layer, and the second wall of the battery cell is bonded to the housing via the third adhesive layer.

[0025] 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.

[0026] 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.

[0027] In some embodiments, 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, 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.

[0028] In some embodiments, the heat conductive member includes a metallic material and / or a non-metallic material.

[0029] In some embodiments, the heat conductive member includes a metal plate and an insulating layer, the insulating layer being placed on the surface of the metal plate, or the heat conductive member is a non-metallic material plate.

[0030] In some embodiments, the battery cells are plurality and arranged along a second direction, the heat conductive member includes a partition plate, the partition plate extends along the second direction and is connected to the first wall of each battery cell in the plurality of battery cells, and the second direction is parallel to the first wall.

[0031] In some embodiments, the heat conductive member further includes an insulating layer, which is used to insulate and isolate the first wall of the battery cell from the partition plate.

[0032] In some embodiments, the thermal conductivity of the insulating layer is 0.1 W / (m·K) or higher.

[0033] In some embodiments, the dimension T1 of the partition plate in the first direction is less than 0.5 mm, and the first direction is perpendicular to the first wall.

[0034] In some embodiments, the dimension T1 of the partition plate in the first direction is greater than 5 mm, and the first direction is perpendicular to the first wall.

[0035] In some embodiments, the surface of the heat conduction member connected to the first wall is an insulating surface, where the dimensions of the heat conduction member in the first direction are 0.1 to 100 mm, and the first direction is perpendicular to the first wall.

[0036] In some embodiments, in the third direction, the dimension H1 of the partition plate and the dimension 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.

[0037] In some embodiments, a cavity is installed inside the partition plate.

[0038] In some embodiments, the cavity is used to house a heat exchange medium for regulating the temperature of the battery cell.

[0039] In some embodiments, in the first direction, the dimension of the cavity is W, the capacity Q of the battery cell and the dimension W of the cavity satisfy 1.0 Ah / mm ≤ Q / W ≤ 400 Ah / mm, and the first direction is perpendicular to the first wall.

[0040] In some embodiments, the partition plate further includes a pair of heat conduction plates positioned opposite each other along a first direction, the cavity being located between the pair of heat conduction plates, and the first direction being perpendicular to the first wall.

[0041] In some embodiments, the partition plate further includes reinforcing ribs, which are provided between the pair of heat conductive plates.

[0042] In some embodiments, the reinforcing rib is connected to at least one of the pair of heat conductive plates.

[0043] In some embodiments, the reinforcing rib includes a first reinforcing rib, the ends of which are each connected to the pair of heat conductive plates, and the first reinforcing rib is installed at an inclination with respect to the first direction.

[0044] In some embodiments, the angle between the first reinforcing rib and the first direction is in the range of 30° to 60°.

[0045] In some embodiments, the reinforcing rib further includes a second reinforcing rib, one end of which is connected to one of the pair of heat conduction plates, and the other end of which is spaced apart from the other of the pair of heat conduction plates.

[0046] In some embodiments, the second reinforcing rib extends along the first direction and protrudes from one of the pair of heat conduction plates.

[0047] In some embodiments, the first reinforcing rib and the second reinforcing rib are installed with a gap between them.

[0048] In some embodiments, in the first direction, the thickness D of the heat conductive plate and the dimension W of the cavity satisfy 0.01 ≤ D / W ≤ 25.

[0049] In some embodiments, the partition plate is provided with a medium inlet and a medium outlet, the cavity is in communication with the medium inlet and the medium outlet, and a cavity is provided inside the partition plate that is isolated from both the medium inlet and the medium outlet.

[0050] In some embodiments, a partition member is provided within the cavity, and the partition member is used to partition the cavity and form at least two flow paths.

[0051] In some embodiments, the heat conduction member includes a first heat conduction plate, a second heat conduction plate, and a partition member, which are stacked and installed, the partition member being installed between the first heat conduction plate and the second heat conduction plate, the first heat conduction plate and the partition member together defining a first flow path, and the second heat conduction plate and the partition member together defining a second flow path.

[0052] In some embodiments, at least a portion of the heat conductive member is configured to be deformable when subjected to pressure.

[0053] In some embodiments, the heat conductive member includes a heat exchange layer and a compressible layer arranged in a laminated manner, wherein the elastic modulus of the compressible layer is less than the elastic modulus of the heat exchange layer.

[0054] In some embodiments, the compressible layer includes a compressible cavity, and the compressible cavity is filled with a phase change material or an elastic material.

[0055] In some embodiments, the heat conduction member includes an outer case and a support member, the support member being used to define a cavity and a deformable cavity housed within the outer case and separated within the outer case, the cavity being used to allow a heat exchange medium to flow, and the deformable cavity being arranged to deform when the outer case is subjected to pressure.

[0056] In some embodiments, the heat conduction member includes an outer case and an isolation assembly, the isolation assembly being housed within and connected to the outer case, thereby forming a cavity between the outer case and the isolation assembly, the cavity being used to allow a heat exchange medium to flow, and the isolation assembly being positioned to deform when the outer case is subjected to pressure.

[0057] In some embodiments, the heat conductive member is provided with a relief structure, which is used to provide space for the battery cell to expand.

[0058] In some embodiments, multiple battery cells are installed, and at least a portion of the relief structure is located between two adjacent battery cells and is used to provide space for at least one of the battery cells to expand.

[0059] In some embodiments, in a first direction, the heat conducting member includes a first heat conducting plate and a second heat conducting plate installed opposite each other, with a cavity provided between the first heat conducting plate and the second heat conducting plate, the cavity used to house 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 and facing toward the other, thereby forming the relief structure, and the first direction is perpendicular to the first wall.

[0060] In some embodiments, battery groups are provided within the housing, and there are two or more battery groups arranged along a first direction, with each battery group containing two or more battery cells arranged along a second direction, the second direction being perpendicular to the first direction, and the first direction being perpendicular to the first wall.

[0061] In some embodiments, the heat conductive member is sandwiched between two adjacent battery groups.

[0062] In some embodiments, the battery further includes a connecting tube module, the heat conduction member having a cavity for housing a heat exchange medium, and the connecting tube module is used to connect the cavities of two or more of the heat conduction members.

[0063] In some embodiments, the connecting pipe module includes a communication passage, a supply pipe, and a discharge pipe, wherein, along the first direction, the cavities of two adjacent heat conductors communicate through the communication passage, and the supply pipe and the discharge pipe communicate with the cavities of the same heat conductor.

[0064] In some embodiments, the housing includes a main body and a bottom cover installed at the bottom of the main body, the bottom cover and the main body are sealed together and together form the sealed housing cavity.

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

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

[0067] In some embodiments, the fixing member includes a mounting member, the mounting member is provided on the upper part of the housing, and the battery cell is provided on the surface of the mounting member.

[0068] In some embodiments, the minimum thickness H of the placement member and the weight M1 of the battery satisfy 0.0002 mm / kg < H / M1 ≤ 0.2 mm / kg.

[0069] In some embodiments, the placement member is used to define the accommodation cavity, and the battery cell is suspended from the placement member.

[0070] In some embodiments, the battery cell is adhered to the placement member.

[0071] In some embodiments, the battery cell is the has a second outer surface disposed on the opposite side of one outer surface, and the electrode terminal is disposed on the second outer surface.

[0072] In some embodiments, there are a plurality of the battery cells, and the plurality of battery cells are arranged and installed in a second direction, the second direction is perpendicular to the vertical direction, the placement member is connected to the ceiling walls of the plurality of battery cells, the battery cells are located below the placement member, and the relationship between the dimension N of the placement member in the vertical direction and the weight M2 of the battery cells satisfies 0.04 mm / kg ≤ N / M2 ≤ 100 mm / kg.

[0073] In some embodiments, a cavity is installed inside the placement member.

[0074] In some embodiments, the cavity is used to accommodate a heat exchange medium for regulating the temperature of the battery cell.

[0075] In some embodiments, in the vertical direction, reinforcing ribs are provided on the surface of the placement member away from the battery cell.

[0076] [[ID=3,6]] In some embodiments, the placement member has a placement surface facing the accommodation cavity, and the placement surface is configured as a flat surface.

[0077] In some embodiments, the aforementioned mounting member has a mounting portion and a connecting portion, the connecting portion is connected to surround the edge of the aforementioned mounting portion, the aforementioned mounting portion is used to define the housing cavity, and the connecting portion is connected to a portion of the housing other than the aforementioned mounting member, where the inner structure of the aforementioned mounting portion facing the housing cavity forms the aforementioned mounting surface.

[0078] In some embodiments, the aforementioned mounting portion is installed so as to protrude from the connecting portion in a direction away from the housing cavity.

[0079] In some embodiments, the housing includes a bottom cover and a frame, the frame forming a confined space that is installed penetrating both vertical ends, the bottom cover and the aforementioned mounting member each cover the opposing vertical ends of the confined space, and the housing cavity is formed enclosed by the bottom cover, the frame and the aforementioned mounting member.

[0080] In some embodiments, the battery cell is placed inverted within the housing such that its end cover faces the bottom wall of the housing cavity, and the depressurization mechanism and electrode terminals are installed on the end cover, with both the depressurization mechanism and the electrode terminals facing the bottom wall.

[0081] In some embodiments, the battery further includes a connecting plate and a connector, the connecting plate being installed protruding horizontally from one side of the housing, the connecting plate and the bottom wall of the housing cavity forming a vertical storage section, the connector being installed within the storage section and connected to the connecting plate, and the connector being electrically connected to the battery cell.

[0082] In some embodiments, the fixing member further includes a protective assembly which is installed between the battery cell and the bottom wall, thereby supporting and supporting the battery cell.

[0083] In some embodiments, the battery further includes a bus member used to electrically connect to the electrode terminals of at least two of the battery cells, and a protective assembly is installed between the bottom wall and the bus member, and the protective assembly is installed to insulate the battery cells from the bottom wall.

[0084] In some embodiments, the protective assembly includes a protective strip, the protective strip contacting the battery cell.

[0085] In some embodiments, the protective strip is fixedly connected to the battery cell and / or the housing.

[0086] In some embodiments, the protective strip is bonded to the battery cell and / or the housing.

[0087] In some embodiments, multiple protective strips are installed, the multiple protective strips are spaced apart in a second direction and extend along a first direction, and the first direction, the second direction and the direction perpendicular to it are each perpendicular to each other.

[0088] In some embodiments, the protective assembly further includes a main plate, the protective strip is connected to the main plate, and the main plate is located between the protective strip and the bottom wall.

[0089] In some embodiments, the main plate abuts against the bottom wall.

[0090] In some embodiments, the main plate is fixedly connected to the bottom wall.

[0091] In some embodiments, the main plate is integrally molded with or detachably connected to the protective strip.

[0092] In some embodiments, the end cover of the battery cell includes a functional area and a shoulder portion. The electrode terminal is installed in the functional area. The shoulder portion is located on both sides of the functional area along a second direction, and the battery cell abuts against the protection strip through the shoulder portion. The second direction is perpendicular to the vertical direction.

[0093] In some embodiments, in the vertical direction, the thickness of the protection strip is greater than the extended height of the portion of the electrode terminal exposed from the battery cell.

[0094] In some embodiments, the protection strip abuts against the electrode terminal, or the protection strip and the electrode terminal are installed at an interval.

[0095] In some embodiments, the orthographic projection of the electrode terminal on the bottom wall is located between the orthographic projections of the adjacent protection strips on the bottom wall.

[0096] In some embodiments, the electrode terminals of two adjacent battery cells are electrically connected via a bus member. In a first direction, the extension length of one of the two adjacent protection strips is shorter than that of the other, thereby forming a relief notch, and the relief notch is used to allow the bus member to pass through.

[0097] In some embodiments, the battery cell further includes a pressure relief mechanism. The pressure relief mechanism is installed on the same side as the electrode terminal. The orthographic projection of the pressure relief mechanism on the bottom wall is located between the orthographic projections of the adjacent protection strips on the bottom wall.

[0098] In some embodiments, in the vertical direction, there is a first distance H3 between the end cover and the bottom wall of the battery cell, and the first distance H3 satisfies 2mm < H3 < 30mm.

[0099] In some embodiments, the ratio H3 / M2 of the first distance H3 to the weight M2 of a single battery cell satisfies 0.2 mm / Kg < H3 / M2 < 50 mm / Kg.

[0100] In some embodiments, the battery cell further includes a battery case, an electrode assembly is provided in the battery case, a pressure reducing mechanism is installed in the battery case, and the pressure reducing mechanism is integrally formed with the battery case.

[0101] In some embodiments, the battery case includes an integrally formed non-fragile region and a fragile region, a groove is installed in the battery case, the non-fragile region is formed around the groove, the fragile region is formed at the bottom of the groove, the fragile region is arranged to be broken when the battery cell releases internal pressure, and the pressure reducing mechanism includes the fragile region.

[0102] In some embodiments, when the average crystal grain size of the fragile region is S1 and the average crystal grain size of the non-fragile region is S2, 0.05 ≤ S1 / S2 ≤ 0.9 is satisfied.

[0103] In some embodiments, when the minimum thickness of the fragile region is A1, ~1 ≤ A1 / S1 ≤ 100 is satisfied. <000,0603> In some embodiments, when the minimum thickness of the fragile region is A1 and the hardness of the fragile region is B1, 5 HBW / mm ≤ B1 / A1 ≤ 10000 HBW / mm is satisfied.

[0105] In some embodiments, when the hardness of the fragile region is B1 and the hardness of the non-fragile region is B2, 1 < B1 / B2 ≤ 5 is satisfied. <,

[0106] In some embodiments, when the minimum thickness of the fragile region is A1 and the minimum thickness of the non-fragile region is A2, 0.05 ≤ A1 / A2 ≤ 0.95 is satisfied. <00006,11>

[0107] In some embodiments, the battery cell includes an electrode assembly, the electrode assembly includes a positive electrode sheet and a negative electrode sheet, the positive electrode sheet and / or the negative electrode sheet include 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.

[0108] In some embodiments, the conductive layer is installed on at least one side of the support layer along the thickness direction of the support layer.

[0109] In some embodiments, the surface resistance R of the conductive layer at room temperature S This is 0.016Ω / □≦R S The condition ≤420Ω / □ is satisfied.

[0110] In some embodiments, the material of the conductive layer is selected from at least one of aluminum, copper, titanium, silver, nickel-copper alloy, and aluminum-zirconium alloy.

[0111] In some embodiments, the material of the support layer includes one or more polymer materials and polymer-based composite materials.

[0112] In some embodiments, the thickness d1 of the support layer and the light transmittance k of the support layer satisfy the following: when 12 μm ≤ d1 ≤ 30 μm, 30% ≤ k ≤ 80%; when 8 μm ≤ d1 < 12 μm, 40% ≤ k ≤ 90%; or when 1 μm ≤ d1 < 8 μm, 50% ≤ k ≤ 98%.

[0113] In some embodiments, the battery cell includes an electrode assembly, 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, M includes one or more selected from Fe, Ni, Co, and Mn, the shell includes a crystalline inorganic substance, the crystalline inorganic substance has a half-value width of the main peak measured by X-ray diffraction of 0 to 3°, and the crystalline inorganic substance includes one or more of a metal oxide and an inorganic salt.

[0114] In some embodiments, the shell includes at least one of the metal oxide and the inorganic salt and carbon.

[0115] In some embodiments, the battery cell includes an electrode assembly, 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. When the ionic radius of the non-Mn element is a and the ionic radius of the manganese element is b, |a - b| / b is 10% or less. When 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 P-O bond. The highest valence of the non-Mn element is 6 or less.

[0116] 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 dopant, and the second doping element is a phosphorus-site dopant.

[0117] In some embodiments, the first doping element satisfies at least one of the following conditions: If the ionic radius of the first doping element is a and the ionic radius of the manganese element is b, then |ab| / b is 10% or less. If the valence change voltage of the first doping element is U, then it is 2V. <U<5.5Vである。

[0118] 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 greater than or equal to the chemical activity of the PO bond. The maximum value of the second doping element is 6 or less.

[0119] In some embodiments, the positive electrode active material further comprises a coating layer.

[0120] In some embodiments, the coating layer contains carbon.

[0121] In some embodiments, the carbon in the coating layer is a mixture of SP2 form carbon and SP3 form carbon.

[0122] In some embodiments, the molar ratio of SP2 form carbon to SP3 form carbon is any value within the range of 0.1 to 10.

[0123] The power consumption device according to the second embodiment of the present application includes a battery according to the first embodiment of the present application for supplying electrical energy.

[0124] Other aspects and advantages of the present application are, in part, described below, become apparent from the following description, or are understood by practicing the present application. [Brief explanation of the drawing]

[0125] The above and / or other aspects and advantages of the present application will become apparent and readily apparent from the description of the embodiments with reference to the following drawings.

[0126] [Figure 1] This is a schematic diagram of a power consumption device according to one embodiment of the present invention. [Figure 2] This is an exploded view of a battery according to one embodiment of the present invention. [Figure 3] This is an exploded view of a battery according to another embodiment of the present invention. [Figure 4] This is an exploded view of a battery cell according to one embodiment of the present invention. [Figure 5] Figure 4 is a schematic diagram of the battery cell. [Figure 6] This is a schematic diagram of the arrangement of battery cells according to another embodiment of the present invention. [Figure 7] This is an exploded view of a battery according to one embodiment of the present invention. [Figure 8] Figure 7 is a schematic diagram of the battery cell arrangement. [Figure 9] This is a schematic diagram of a battery cell according to one embodiment of the present invention. [Figure 10] This is a schematic diagram of a battery according to one embodiment of the present invention. [Figure 11] Figure 10 is a schematic diagram of the heat conductive member shown. [Figure 12] Figure 10 is a schematic diagram of the heat conductive member and multiple battery cells shown. [Figure 13] Figure 10 shows another schematic diagram of the battery. [Figure 14] This is a schematic diagram of a partial structure of a battery according to one embodiment of the present invention. [Figure 15] Figure 14 shows another schematic diagram of the battery. [Figure 16] Figure 14 is a schematic diagram of the battery cell arrangement. [Figure 17] This is a schematic diagram of a partial structure of a battery according to one embodiment of the present invention. [Figure 18] Figure 17 is another schematic diagram of the battery. [Figure 19] Figure 17 is yet another schematic diagram of the battery shown. [Figure 20] This is a schematic diagram of a partial structure of a battery according to one embodiment of the present invention. [Figure 21] Figure 20 is a schematic diagram of the thermal management component shown. [Figure 22]Figure 21 is a cross-sectional view of the thermal management component shown. [Figure 23] This is an enlarged view of the area A enclosed by the circle in Figure 22. [Figure 24] This is a cross-sectional view of a heat-conducting member having a partition member inside, according to one embodiment of the present invention. [Figure 25] This is an enlarged view of the circled area B in Figure 22. [Figure 26] This is an enlarged view of the area C enclosed by the circle in Figure 22. [Figure 27] This is a cross-sectional view of a heat-conducting member according to one embodiment of the present application. [Figure 28] This is an enlarged view of the area D enclosed by the circle in Figure 27. [Figure 29] This is an enlarged view of the circled area E in Figure 27. [Figure 30] This is a schematic diagram of a partial structure of a battery according to one embodiment of the present invention. [Figure 31] Figure 30 is a partial cross-sectional view of the battery shown. [Figure 32] This is an enlarged view of the area F enclosed by the circle in Figure 31. [Figure 33] These are schematic diagrams of various structures of partition plates according to some embodiments of the present invention. [Figure 34] This is an exploded view of a battery according to one embodiment of the present invention. [Figure 35] This is a schematic diagram of a battery according to one embodiment of the present invention. [Figure 36] Figure 35 is a schematic diagram of the connection between the battery cell and the thermal management component. [Figure 37] This is a cross-sectional view along the direction AA in Figure 36. [Figure 38] This is an enlarged view of the area G enclosed by the circle in Figure 37. [Figure 39] This is a schematic diagram of a battery according to one embodiment of the present invention. [Figure 40] This is an exploded view of a battery according to one embodiment of the present invention. [Figure 41] This is an exploded view of a battery according to one embodiment of the present invention. [Figure 42] This is a schematic diagram of a battery according to one embodiment of the present invention. [Figure 43] Figure 42 is another schematic diagram of the battery. [Figure 44] Figure 42 is yet another schematic diagram of the battery shown. [Figure 45] This is a cross-sectional view along the BB direction in Figure 44. [Figure 46] This is a schematic diagram of a battery according to one embodiment of the present invention. [Figure 47] Figure 46 is a schematic diagram of the heat conductive member shown. [Figure 48] Figure 47 is a cross-sectional view of the main body plate. [Figure 49] This is another cross-sectional view of the main body plate shown in Figure 47. [Figure 50] This is a cross-sectional view of the main plate according to one embodiment of the present application. [Figure 51] This is a cross-sectional view of the main plate according to one embodiment of the present application. [Figure 52] This is a schematic diagram of a heat conductive member according to one embodiment of the present invention. [Figure 53] This is a cross-sectional view of a heat-conducting member according to one embodiment of the present application. [Figure 54] This is another cross-sectional view of the heat conductive member in Figure 53. [Figure 55] This is a cross-sectional view of a partition member according to one embodiment of the present invention. [Figure 56] This is a cross-sectional view of a heat-conducting member according to one embodiment of the present application. [Figure 57] This is a cross-sectional view of a partition member according to one embodiment of the present invention. [Figure 58] This is a cross-sectional view of a heat-conducting member according to one embodiment of the present application. [Figure 59] This is a schematic diagram of a partition member according to one embodiment of the present invention. [Figure 60] This is a cross-sectional view of a heat-conducting member according to one embodiment of the present application. [Figure 61] This is a cross-sectional view of a battery according to one embodiment of the present invention. [Figure 62] This is a cross-sectional view of a battery according to one embodiment of the present invention. [Figure 63] This is a cross-sectional view of a battery according to one embodiment of the present invention. [Figure 64] This is a cross-sectional view of a battery according to one embodiment of the present invention. [Figure 65] This is a schematic diagram of a heat conductive member according to one embodiment of the present invention. [Figure 66] This is a cross-sectional view of a heat-conducting member according to one embodiment of the present application. [Figure 67] This is a cross-sectional view of a heat-conducting member according to one embodiment of the present application. [Figure 68] This is a cross-sectional view of a heat-conducting member according to one embodiment of the present application. [Figure 69] This is a cross-sectional view of a heat-conducting member according to one embodiment of the present application. [Figure 70] This is a cross-sectional view of a heat-conducting member according to one embodiment of the present application. [Figure 71] This is a schematic diagram of a compressible cavity according to one embodiment of the present invention. [Figure 72] This is a schematic diagram of a portion of a heat conductive member according to one embodiment of the present invention. [Figure 73] Figure 72 is another schematic diagram of the heat conductive member shown. [Figure 74] This is a schematic diagram of a heat conductive member according to one embodiment of the present invention. [Figure 75] This is a schematic diagram of a heat conductive member according to one embodiment of the present invention. [Figure 76] This is a schematic diagram of a heat conductive member according to one embodiment of the present invention. [Figure 77] This is a schematic diagram of a heat conductive member according to one embodiment of the present invention. [Figure 78] This is a schematic diagram of a heat conductive member according to one embodiment of the present invention. [Figure 79] This is an exploded view of a heat conductive member according to one embodiment of the present invention. [Figure 80] Figure 79 is a schematic diagram of the flow collection member shown. [Figure 81] This is a schematic diagram of a battery according to one embodiment of the present invention. [Figure 82] This is a schematic diagram of a heat conductive member according to one embodiment of the present invention. [Figure 83] This is a schematic diagram of a heat conductive member according to one embodiment of the present invention. [Figure 84]This is an enlarged view of the circled area H in Figure 83. [Figure 85] This is a schematic diagram of a battery according to one embodiment of the present invention. [Figure 86] This is a schematic diagram of a heat conductive member according to one embodiment of the present invention. [Figure 87] Figure 86 is another schematic diagram of the heat conductive member shown. [Figure 88] This is a schematic diagram of a heat conductive member according to one embodiment of the present invention. [Figure 89] This is an enlarged view of the circled area I in Figure 87. [Figure 90] This is an enlarged view of the circled area J in Figure 88. [Figure 91] Figure 90 is another schematic diagram of the heat conduction member. [Figure 92] This is a schematic diagram of a heat conductive member according to one embodiment of the present invention. [Figure 93] This is a schematic diagram of a heat conductive member according to one embodiment of the present invention. [Figure 94] This is an enlarged view of the circled area K in Figure 93. [Figure 95] This is a schematic diagram of a heat conductive member according to one embodiment of the present invention. [Figure 96] This is an enlarged view of the circled area L in Figure 95. [Figure 97] This is a schematic diagram of a portion of a heat conductive member according to one embodiment of the present invention. [Figure 98] This is a schematic diagram of a portion of a heat conductive member according to one embodiment of the present invention. [Figure 99] This is a schematic diagram of a heat conductive member according to one embodiment of the present invention. [Figure 100] This is a schematic diagram of a battery according to one embodiment of the present invention. [Figure 101] Figure 100 is an exploded view of the battery. [Figure 102] This is a schematic diagram of a battery according to one embodiment of the present invention. [Figure 103] This is a schematic diagram of a heat conductive member according to one embodiment of the present invention. [Figure 104] This is a schematic diagram of a heat conductive member according to one embodiment of the present invention. [Figure 105]Schematic diagram of a heat conduction member according to an embodiment of the present application. [Figure 106] Schematic diagram of a heat conduction member according to an embodiment of the present application. [Figure 107] Schematic diagram of a battery according to an embodiment of the present application. [Figure 108] Schematic diagram of a battery according to an embodiment of the present application. [Figure 109] Schematic diagram of a battery according to an embodiment of the present application. [Figure 110] Schematic diagram of a battery cell according to an embodiment of the present application. [Figure 111] Schematic diagram of a battery according to an embodiment of the present application. [Figure 112] Schematic diagram of a battery according to an embodiment of the present application. [Figure 113] Schematic diagram of the heat conduction member shown in FIG. 112. [Figure 114] Schematic diagram of a heat conduction member according to an embodiment of the present application. [Figure 115] Another schematic diagram of the heat conduction member of FIG. 114. [Figure 116] Schematic diagram of the structure of a battery according to some embodiments of the present application. [Figure 117] Exploded view of the battery shown in FIG. 116. [Figure 118] Schematic diagram of the structure of a bottom cover according to some embodiments of the present application. [Figure 119] Plan view of the bottom cover shown in FIG. 118. [Figure 120] Front view of the bottom cover shown in FIG. 118. [Figure 121] Schematic diagram of the structure of a bottom cover according to another embodiment of the present application. [Figure 122] Exploded view of the battery shown in FIG. 116. [Figure 123] Schematic diagram of the orthographic projection in the vertical direction of the bottom cover shown in FIG. 120. [Figure 124] Schematic diagram of the outer shape of a battery cell according to some embodiments of the present application. [Figure 125] Front view of the battery cell shown in FIG. 124. [Figure 126] This is a schematic diagram of the structure of the mounting member in some embodiments of the present application. [Figure 127] This is a schematic diagram of the structure of a mounting member in another embodiment of the present application. [Figure 128] Figure 127 is a vertical orthographic projection of the mounting member. [Figure 129] Figure 116 is a front view of the battery. [Figure 130] This is a schematic diagram showing how batteries in some embodiments of the present invention are applied to the body. [Figure 131] Figure 130 is a schematic diagram of the battery. [Figure 132] This is the first exploded state diagram of the structure shown in Figure 130. [Figure 133] This is the second exploded state diagram of the structure shown in Figure 130. [Figure 134] This is a schematic diagram showing the relationship between the battery and the body in some embodiments of the present invention. [Figure 135] This is a schematic diagram of a battery according to some embodiments of the present invention. [Figure 136] This is a schematic diagram of the structure of a mounting member according to several embodiments of the present application. [Figure 137] This is a schematic diagram of the structure of a mounting member according to several embodiments of the present application. [Figure 138] This is a schematic diagram of the structure of a mounting member according to several embodiments of the present application. [Figure 139] This is a schematic diagram of the structure of a mounting member according to several embodiments of the present application. [Figure 140] This is a schematic diagram of the structure of a mounting member according to several embodiments of the present application. [Figure 141] This is a schematic diagram of the structure of a battery according to several embodiments of the present invention. [Figure 142] This is a schematic diagram of the structure of a battery according to one embodiment of the present invention. [Figure 143] Figure 142 is a schematic diagram of the battery module. [Figure 144] This is a schematic diagram showing a battery cell and a heat conductive member fitted together according to several embodiments of the present application. [Figure 145]Schematic diagram of a battery cell and a heat conduction member fitted together according to some embodiments of the present application. [Figure 146] Schematic diagram of a battery cell and a heat conduction member fitted together according to some embodiments of the present application. [Figure 147] Exploded view of a battery according to some embodiments of the present application. [Figure 148] Schematic structural diagram of a battery protection assembly shown in FIG. 147. [Figure 149] Schematic cross-sectional view of the battery shown in FIG. 147. [Figure 150] Enlarged schematic view of part B surrounded by a circle in FIG. 149. [Figure 151] Schematic structural diagram of a collision test device A for performing a collision test on a battery according to some embodiments of the present application. [Figure 152] Schematic layout diagram of electrode terminals according to some embodiments of the present application. [Figure 153] Schematic diagram of a battery cell and a heat conduction member fitted together according to some embodiments of the present application. [Figure 154] Schematic structural diagram of an outer case according to some embodiments of the present application. [Figure 155] Cross-sectional view C-C of the outer case shown in FIG. 154. [Figure 156] Crystal grain size diagram (schematic diagram) of the outer case shown in FIG. 155. [Figure 157] Partial enlarged view of part E of the outer case shown in FIG. 155. [Figure 158] Partial enlarged view of an outer case according to some embodiments of the present application. <​​​​​​​​​​​​This is a schematic diagram of the outer case structure according to another embodiment of the present application (showing a single shallow groove). [Figure 164] Figure 163 is a cross-sectional view of the outer casing GG. [Figure 165] This is a schematic diagram of the outer case structure according to another embodiment of the present application (showing the second shallow groove). [Figure 166] Figure 167 is a cross-sectional view of the outer casing KK. [Figure 167] This is a schematic diagram of the outer case structure according to another embodiment of the present application (showing the second shallow groove). [Figure 168] Figure 167 shows a cross-sectional view of the outer casing (MM). [Figure 169] This is a schematic diagram of the outer case structure according to another embodiment of the present application (showing the second shallow groove). [Figure 170] Figure 169 shows a cross-sectional view of the outer case at NN. [Figure 171] These are axial measurements of the outer casing according to several embodiments of the present application. [Figure 172] Figure 171 is a schematic diagram of the outer casing structure (showing a single shallow groove and a single counterbore groove). [Figure 173] Figure 172 is a cross-sectional view of the outer case. [Figure 174] This is a schematic diagram of the outer case structure according to another embodiment of the present application (showing a single shallow groove and a single counterbore groove). [Figure 175] Figure 174 is a cross-sectional view of the PP outer casing. [Figure 176] This is a schematic diagram of the outer case structure according to another embodiment of the present application (showing a single shallow groove and a single counterbore groove). [Figure 177] Figure 176 shows a cross-sectional view of the outer case at QQ. [Figure 178] This is a schematic diagram of the outer case structure according to several embodiments of the present application (showing a single shallow groove and a second counterbore groove). [Figure 179] Figure 178 shows a cross-sectional view of the outer casing (RR). [Figure 180] This is a schematic diagram of the outer case structure according to another embodiment of the present application (showing a single shallow groove and a second counterbore groove). [Figure 181] Figure 180 is a cross-sectional view of the outer casing (SS). [Figure 182] This is a schematic diagram of the structure of an outer case member according to several embodiments of the present invention (showing a single shallow groove and a double counterbore groove). [Figure 183] Figure 182 is a cross-sectional view of the outer casing TT. [Figure 184] This is a schematic diagram of the structure of the outer case according to another embodiment of the present application. [Figure 185] This is a schematic diagram of the crystal grain size of the outer case according to another embodiment of the present application. [Figure 186] This is a schematic diagram of the structure of an end cover according to several embodiments of the present invention. [Figure 187] This is a schematic diagram of the structure of a housing according to several embodiments of the present invention. [Figure 188] This is a schematic diagram of the structure of a housing according to another embodiment of the present invention. [Figure 189] This is a schematic diagram of the structure of a battery cell according to several embodiments of the present invention. [Figure 190] This is a schematic diagram of the structure of a positive electrode current collector according to a specific embodiment of the present invention. [Figure 191] This is a schematic diagram of the structure of a positive electrode current collector according to another specific embodiment of the present application. [Figure 192] This is a schematic diagram of the structure of a negative electrode current collector according to a specific embodiment of the present invention. [Figure 193] This is a schematic diagram of the structure of a negative electrode current collector according to another specific embodiment of the present application. [Figure 194] This is a schematic diagram of the structure of a positive electrode sheet according to a specific embodiment of the present invention. [Figure 195] This is a schematic diagram of the structure of a positive electrode sheet according to another specific embodiment of the present application. [Figure 196] This is a schematic diagram of the structure of a negative electrode sheet according to a specific embodiment of the present invention. [Figure 197] This is a schematic diagram of the structure of a negative electrode sheet according to another specific embodiment of the present application. [Figure 198] This is a schematic diagram of a single nail-driving test of the present invention. [Figure 199] These are the temperature change curves for lithium-ion battery 1# and lithium-ion battery 4# after a single nail-driving test. [Figure 200] These are the voltage change curves for lithium-ion battery 1# and lithium-ion battery 4# after a single nail-driving test. [Figure 201] These are the X-ray diffraction (XRD) spectra of undoped LiMnPO4 and the positive electrode active material produced in Example 2. [Figure 202] This is the energy-dispersive X-ray spectroscopy (EDS) spectrum of the positive electrode active material produced in Example 2. [Figure 203] This is a schematic diagram of the positive electrode active material having the core-shell structure described in the present application. [Figure 204] This is a schematic diagram of a positive electrode active material having a core-shell structure according to one embodiment of the present invention. [Figure 205] These are schematic diagrams of heat conduction members and partition members according to some embodiments of the present application. [Figure 206] Figure 205 is a schematic diagram of the heat conductive member and multiple battery cells shown. [Modes for carrying out the invention]

[0127] Embodiments of the present application will be described in more detail below with reference to the drawings and examples. The detailed description of the following embodiments and drawings are used to illustrate the principles of the present application, but are not intended to limit the scope of the present application, and the present application is not limited to the embodiments described.

[0128] In this description, unless otherwise defined, all technical and scientific terms used have the same meaning as those generally understood by those skilled in the art, and the terms used are solely for the purpose of describing specific embodiments and are not intended to limit this application. The terms “includes” and “has” and their synonyms in the description of the specification, claims, and drawings are intended to be non-exclusive, “plural” means two or more, and the directions or positional relationships indicated by terms such as “up,” “down,” “left,” “right,” “inside,” and “outside” are merely for the purpose of facilitating and simplifying the description of this application and do not indicate or imply that the devices or elements in question have a specific direction, or should be composed of and operated in a specific direction, and therefore should not be understood as limiting this application. Furthermore, terms such as “first,” “second,” and “third” are used solely for descriptive purposes and should not be understood as indicating or implying relative importance. “Perpendicular” does not mean perpendicular in the strict sense, but is within an acceptable margin of error. "Parallel" here doesn't mean perfectly parallel in the strict sense, but rather within a tolerable margin of error.

[0129] In this Application, the term “Examples” means that certain features, structures, or properties described in relation to the Examples may be included in at least one Example of this Application. Where the term “Examples” appears elsewhere in this Specification, it does not necessarily refer to the same Example, nor does it refer to an Example that is mutually exclusive, independent, or substitutable with other Examples. Those skilled in the art will understand, both explicitly and implicitly, that the Examples described herein can be combined with other Examples.

[0130] All directional expressions appearing in the following description refer to the directions shown in the figures and do not limit the specific structure of the present application. Further explanation is needed in the description of the present application. Unless otherwise explicitly defined and limited, the terms “attached,” “connected,” and “connected” should be understood in a broad sense. For example, they may be fixed connections, detachable connections, or integral connections. They may be directly connected, indirectly connected via an intermediate medium, or internal communication between two elements. Those skilled in the art will be able to understand the specific meaning of these terms in the present application depending on the specific circumstances.

[0131] In this application, the term "and / or" merely describes the relationship or connection between related objects, indicating that three types of relationships are possible. For example, A and / or B can represent three situations: A exists alone, A and B exist simultaneously, and B exists alone. In this application, unless otherwise specified, the term "or" is inclusive. For example, the phrase "A or B" means "A, B, or both A and B," and more specifically, the condition "A or B" is satisfied by either A being true (or existing) and B being false (or not existing), or A being false (or not existing) and B being true (or existing), or both A and B being true (or existing).

[0132] In this application, “includes” and “inclusive” refer to both open and closed forms unless otherwise specified. For example, “includes” and “inclusive” may include or include other components not listed, or may include or include only the listed components.

[0133] The “range” disclosed herein is defined in the form of a lower and upper limit, and a given range is defined by selecting one lower limit and one upper limit, the selected lower and upper limits defining the boundaries of a particular range. Ranges defined in this manner may or may not include the values ​​at both ends and can be combined in any way, that is, any lower limit can be combined with any upper limit to form a range. Any lower limit may be combined with any upper limit to form an unspecified range, any lower limit may be combined with other lower limits to form an unspecified range, and similarly, any upper limit may be combined with any other upper limit to form an unspecified range. Furthermore, even if not explicitly stated, each point or individual number between the endpoints of a range is included within that range. Thus, each point or individual number, as its own lower or upper limit, can be combined with any other point or individual number, or with other lower or upper limits, to form an unspecified range.

[0134] For example, if the ranges 60-120 and 80-110 are listed for a particular parameter, it is understood that the ranges 60-110 and 80-120 are also expected. Similarly, if the minimum range values ​​1 and 2 are listed, and the maximum range values ​​3, 4, and 5 are listed, the ranges 1-3, 1-4, 1-5, 2-3, 2-4, and 2-5 are all intended. In this application, unless otherwise specified, the numerical range "a-b" means an abbreviated expression for any combination of real numbers between a and b, where both a and b are real numbers. For example, the numerical range "0-5" means that all real numbers between "0-5" are listed in this specification, and "0-5" is merely an abbreviated expression for combinations of these numbers. Also, when a parameter is described as an integer ≥ 2, it is equivalent to disclosing that the parameter is, for example, the integers 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, etc. In this application, a numerical value indicated by "approximately" represents a range, and the range is ±10% of that value.

[0135] All embodiments and optional embodiments of the present application can be combined with each other to form new technical solutions unless otherwise specified. All technical features and optional technical features of the present application can be combined with each other to form new technical solutions unless otherwise specified. All steps of the present application can be performed sequentially or randomly, preferably sequentially, unless otherwise specified. For example, if the method includes steps (a) and (b), it means that the method may include steps (a) and (b) performed sequentially, or steps (b) and (a) performed sequentially. For example, if the method further includes step (c), it means that step (c) may be added to the method in any order, for example, the method may include steps (a), (b), and (c), or steps (a), (c), and (b), or steps (c), (a), and (b), etc.

[0136] In this specification, the terms "coating layer" and "coating" refer to a material layer coated on a core material such as lithium manganese phosphate, and the material layer may completely or partially cover the core. The term "coating layer" is used for ease of explanation and is not intended to limit this application. Furthermore, each coating layer may completely or partially cover the core. Similarly, the term "thickness of the coating layer" refers to the thickness of the material layer coated on the core in the radial direction of the core.

[0137] In this application, the battery cell may include lithium-ion secondary batteries, lithium-ion primary batteries, lithium-sulfur batteries, sodium-lithium-ion batteries, sodium-ion batteries, or magnesium-ion batteries, and the embodiments of this application are not limited thereto. The battery cell may be cylindrical, flattened, rectangular, or have other shapes, and the embodiments of this application are not limited thereto. Battery cells are generally classified into three types according to their packaging: cylindrical battery cells, prismatic battery cells, and soft-pack battery cells, and the embodiments of this application are not limited thereto.

[0138] In the embodiments of this application, the battery refers to a single physical module comprising one or more battery cells to provide higher voltage and capacity. For example, the battery referred to here may include a battery pack. The battery generally includes a housing for packaging one or more battery cells. The housing can prevent liquids or other foreign matter from affecting the charging and discharging of the battery cells.

[0139] The housing 10 may include a first part 101 and a second part 102 (as shown in Figures 2 and 3), and by overlapping the first part 101 and the second part 102, both the first part 101 and the second part 102 define a housing space for housing the battery cell 20. The second part 102 may be a hollow structure with one end open, and the first part 101 may be a plate-like structure, with the first part 101 overlapping the open side of the second part 102 to form a housing with a housing space. Both the first part 101 and the second part 102 may be hollow structures with one side open, with the open side of the first part 101 overlapping the open side of the second part 102 to form a housing with a housing space. Naturally, the housing 10 may be of various shapes such as a cylinder or a rectangular parallelepiped.

[0140] To improve the airtightness after connecting the first part 101 and the second part 102, sealing members such as sealing material and sealing rings may be installed between the first part 101 and the second part 102.

[0141] The material of the housing 10 may be an alloy material such as an aluminum alloy or an iron alloy, a polymer material such as polycarbonate or polyisocyanurate foam, or a composite material made by adding epoxy resin to glass fibers.

[0142] A battery cell includes an electrode assembly and an electrolyte, and the electrode assembly consists of a positive electrode sheet, a negative electrode sheet, and a separator. The battery cell operates primarily by the movement of metal ions between the positive electrode sheet and the negative electrode sheet. The positive electrode sheet includes a positive electrode current collector and a positive electrode active material layer, the positive electrode active material layer being coated on the surface of the positive electrode current collector, and current collectors without the positive electrode active material layer protruding from the current collectors with the positive electrode active material layer, with the current collectors without the positive electrode active material layer forming the positive electrode tab. Taking a lithium-ion battery as an example, the material of the positive electrode current collector may be aluminum, and the positive electrode active material may be lithium cobalt oxide, lithium iron phosphate, ternary lithium, or lithium manganese oxide, etc. The negative electrode sheet includes a negative electrode current collector and a negative electrode active material layer. The negative electrode active material layer is coated on the surface of the negative electrode current collector. Current collectors without the negative electrode active material layer protrude from the current collectors with the negative electrode active material layer, and these uncoated current collectors form the negative electrode tabs. The negative electrode current collector may be made of copper, and the negative electrode active material may be carbon or silicon, etc. To ensure that melting does not occur due to high current, there are multiple positive electrode tabs, and the negative electrode tabs are also multiple, and they are laminated together.

[0143] The type of separator described above is not particularly limited, and any known porous structure separator having electrical, chemical stability and chemical stability can be selected, for example, one or more single-layer or multi-layer films of glass fiber, nonwoven fabric, polyethylene, polypropylene, and polyvinylidene fluoride. The material of the separator may be polypropylene (PP) or polyethylene (PE), etc. Furthermore, the electrode assembly may be a wound structure or a laminated structure, and the embodiments of this application are not limited thereto.

[0144] The above electrolyte solution contains an organic solvent and an electrolyte salt, of which the electrolyte salt plays a role in transporting ions between the positive and negative electrodes, and the organic solvent acts as a transport medium for ions. The electrolyte salt may be one or more of the electrolyte salts known in this field that are used in the electrolyte solution of battery cells, for example, LiPF6 (lithium hexafluoride phosphate), LiBF4 (lithium tetrafluoroborate), LiClO4 (lithium perchlorate), LiAsF6 (lithium hexafluoride arsenate), LiFSI (lithium bisfluorosulfonylimide), LiTFSI (lithium bistrifluoromethanesulfonylimide), LiTFS (lithium trifluoromethanesulfonate), LiDFOB (lithium difluorophosphate), LiBOB (lithium difluorooxalate borate), LiPO2F2 (lithium bisoxalate borate), LiDFOP (lithium difluorooxalate phosphate), and LiTFOP (lithium tetrafluorooxalate phosphate). The organic solvent may be one of the organic solvents known in this field that are used in the electrolyte solution of battery cells, for example, ethylene carbonate One or more, preferably two or more, of the following: t(EC), propylene carbonate (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), sulfolane (SF), methylsulfonylmethane (MSM), ethyl methanesulfonate (EMS), and diethylsulfone (ESE), and an appropriate electrolyte salt and organic solvent can be selected according to the actual requirements.

[0145] Naturally, it does not need to contain battery cell electrolyte.

[0146] To meet different power demands, a battery may contain multiple battery cells, which can be connected in series, parallel, or series-parallel, with series-parallel connections referring to a mixture of series and parallel connections. Selectively, multiple battery cells may first be connected in series, parallel, or series-parallel to form a battery module, and multiple battery modules may then be further connected in series, parallel, or series-parallel to form a battery. That is, multiple battery cells may directly form a battery, or they may first form a battery module or battery group, and then the battery module or battery group may form a battery. The battery may also be installed within a power consumption device and supply electrical energy to the power consumption device.

[0147] Currently, with the evolving market conditions, the applications of power batteries are expanding rapidly. Power batteries are not limited to applications in energy storage and power systems such as hydroelectric, thermal, wind, and solar power plants, but are also widely used in electric vehicles such as electric bicycles, electric motorcycles, and electric cars, as well as in multiple fields such as military equipment and aerospace. As the application fields of power batteries continue to expand, the demand for them in the market is also constantly growing.

[0148] In related technologies, the opening of the battery housing is typically upward in the vertical direction, the battery cells are fixed to the bottom of the battery, and the electrode terminals are directed towards a cover that conceals the opening of the housing.

[0149] However, in batteries installed as described above, the inventors noticed that when a battery is installed in a power consumption device, its bottom is bonded to the power consumption device and the battery cells are fixed to the bottom of the battery. As a result, the rigidity of the top of the battery, which is more susceptible to impact, is low, and the force exerted on the internal battery cells during the impact process is not uniform, making the battery more prone to damage, reducing the safety of the battery, and affecting its performance.

[0150] Furthermore, a large amount of heat is generated during the charging and discharging process of a battery, and especially during the rapid charging process, the battery cells generate a large amount of heat. This heat constantly accumulates and concentrates, causing a rapid increase in the battery temperature. If the heat from the battery cells is not immediately released, it can cause thermal runaway of the battery, potentially leading to safety accidents such as smoke, fire, and explosion. At the same time, severe temperature unevenness over a long period of time significantly reduces the lifespan of the battery. Also, at low temperatures, the discharge efficiency of the battery is low, and starting up becomes difficult at low temperatures, affecting the normal use of the battery. Therefore, ensuring the thermal management requirements of batteries are extremely important.

[0151] In view of this, the embodiment of the present invention provides a technical solution, in which a battery cell housed in a housing cavity of a housing is installed inside the battery, and the battery cell is fixed inside the housing cavity by a fixing member connecting the second wall and the housing, thereby improving the structural strength of the battery, and at the same time a heat conductive member is installed so as to be in a heat conductive connection with the first wall of the battery cell, so that the heat conductive member is used to conduct heat from the battery cell, thereby ensuring heat conduction inside the battery by utilizing the heat conductive member, thereby effectively improving the safety of the battery and effectively ensuring heat conduction inside the battery, and improving the thermal management performance of the battery.

[0152] The technical solutions described in the embodiments of this application are applicable to a variety of devices that use batteries, such as mobile phones, portable devices, laptop computers, electric vehicles, electric toys, power tools, electric vehicles, ships, and spacecraft, with spacecraft including aircraft, rockets, space shuttles, and spaceships.

[0153] The technical solutions described in the embodiments of this application are applicable not only to the above-mentioned devices but also to all devices that use batteries. However, for the sake of brevity, the following embodiments will all be described using electric vehicles as examples.

[0154] For example, Figure 1 shows a schematic diagram of the structure of a vehicle 1000 according to one embodiment of the present invention. The vehicle 1000 may be a gasoline vehicle, a natural gas vehicle, or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle, or a range extender vehicle, etc. A motor 101, a controller 102, and a battery 100 can be installed inside the vehicle 1000, and the controller 102 is used to control the battery 100 and supply power to the motor 101. For example, the battery 100 can be installed at the bottom, front, or rear of the vehicle 1000. The battery 100 is used to supply power to the vehicle 1000, and for example, the battery 100 can be used as the operating power source for the vehicle 1000's circuit system, for example, to meet the power requirements for starting the vehicle 1000, navigation, and driving. In another embodiment of the present invention, the battery 100 can provide driving power to the vehicle 1000 not only as an operating power source for the vehicle 1000, but also as a driving power source for the vehicle 1000, by substituting or partially substituting fuel or natural gas.

[0155] To meet various power consumption demands, the battery 100 may include one or more battery cells 20. For example, Figures 2 and 3 show schematic diagrams of the structure of a battery 100 according to one embodiment of the present invention, and the battery 100 may include multiple battery cells 20. The battery 100 may further include a housing 10, the inside of which has a hollow structure, and the multiple battery cells 20 are housed inside the housing 10. For example, the multiple battery cells 20 may be connected in parallel, in series, or in series-parallel and then arranged inside the housing 10.

[0156] Optionally, the battery 100 may include other structures, which are not described herein. For example, the battery 100 may further include a bus member, which is used to realize electrical connections between a plurality of battery cells 20, such as parallel, series, or series-parallel connections. Specifically, the bus member can realize electrical connections between the battery cells 20 by connecting the electrode terminals of the battery cells 20. Furthermore, the bus member may be fixed to the electrode terminals of the battery cells 20 by welding. The electrical energy of the plurality of battery cells 20 may further be drawn through the housing via a conductive mechanism. Optionally, the conductive mechanism may belong to the bus member.

[0157] The number of battery cells 20 can be set to any number depending on the different power demands; for example, there may be only one battery cell 20. Multiple battery cells 20 may be connected in series, parallel, or series-parallel configurations to achieve a larger capacity or output. Because each battery 100 contains a large number of battery cells 20, the battery cells 20 can be grouped together for easier installation, and each group of battery cells 20 constitutes a battery module. The number of battery cells 20 included in a battery module is not limited and can be set as needed. A battery may contain multiple battery modules, and these battery modules can be connected in series, parallel, or series configurations.

[0158] Figure 4 shows a schematic diagram of the structure of a battery cell 20 according to one embodiment of the present invention, which includes one or more electrode assemblies 22, a housing 211, and an end cover 212. The housing 211 and the end cover 212 form the outer case or battery case 21 of the battery cell 20. The walls of the housing 211 and the end cover 212 are both called the walls of the battery cell 20, and in the case of a rectangular parallelepiped battery cell 20, the walls of the housing 211 include a bottom wall and four side walls. The shape of the housing 211 is determined according to the shape after one or more electrode assemblies 22 are combined, for example, the housing 211 may be a hollow rectangular parallelepiped, cube, or cylinder, and one face of the housing 211 has an opening, and one or more electrode assemblies 22 can be placed inside the housing 211. For example, if the housing 211 is a hollow rectangular parallelepiped or cube, one of the planes of the housing 211 is an opening, and this plane has no wall and connects the inside and outside of the housing 211. The housing 211 may be a hollow cylindrical body, in which case the end face of the housing 211 is an open surface, that is, the end face has no wall and communicates the inside and outside of the housing 211. The end cover 212 covers the opening 10 and is connected to the housing 211 to form a sealed cavity in which the electrode assembly 22 is placed. The housing 211 is filled with an electrolyte, such as an electrolyte solution, and the material of the housing 211 can be any of several materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, or plastic, and the embodiments of this application are not particularly limited thereto.

[0159] The battery cell 20 may further include two electrode terminals 214 mounted on an end cover 212. The end cover 212 is generally flat, and the two electrode terminals 214 are fixed to the flat surface of the end cover 212, with the two electrode terminals 214 being a positive terminal 214a and a negative terminal 214b, respectively. A connecting member 23 (also referred to as a current collector member) is installed corresponding to each electrode terminal 214, and the connecting member 23 is located between the end cover 212 and the electrode assembly 22 and is used to electrically connect the electrode assembly 22 and the electrode terminals 214.

[0160] As shown in Figure 4, each electrode assembly 22 has a first tab 221a and a second tab 222a. The polarities of the first tab 221a and the second tab 222a are opposite. For example, if the first tab 221a is the positive electrode tab, then the second tab 222a is the negative electrode tab. The first tab 221a of one or more electrode assemblies 22 is connected to one electrode terminal via one connecting member 23, and the second 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.

[0161] In the battery cell 20, one or more electrode assemblies 22 can be installed depending on the requirements of actual use, and Figure 4 shows that four independent electrode assemblies 22 are installed in the battery cell 20.

[0162] The battery cell 20 may be further equipped with a pressure reduction mechanism 213. The pressure reduction mechanism 213 is used to release the internal pressure or temperature of the battery cell 20 when the internal pressure or temperature reaches a threshold. Specifically, the pressure reduction mechanism 213 is an element or component that operates to release the internal pressure when the internal pressure of the battery cell 20 reaches a predetermined threshold. When the internal pressure of the battery cell 2 reaches a predetermined threshold, the pressure reduction mechanism 212 operates or is triggered to a certain state, thereby releasing the internal pressure of the battery cell 20. The operation of the pressure reduction mechanism 212 includes, but is not limited to, the rupture, shattering, tearing, or opening of at least a part of the pressure reduction mechanism 213, thereby forming an opening or passage through which the internal pressure can be released. At this time, the high-temperature, high-pressure material inside the battery cell 20 is discharged as waste from the activated point. This method allows pressure to be released from the battery cell 20 under controllable pressure conditions, avoiding the occurrence of potential and more serious accidents. The pressure reducing mechanism 213 can be of the form of, for example, an explosion-proof valve, an air valve, a pressure reducing valve, or a safety valve, and more specifically, a pressure-sensitive element or structure can be used.

[0163] For example, the depressurization mechanism 213 may be a temperature-sensitive depressurization mechanism configured to melt when the internal temperature of the battery cell 20 in which the depressurization mechanism 213 is installed reaches a threshold. And / or, the depressurization mechanism 213 may be a pressure-sensitive depressurization mechanism, which is configured to rupture when the internal pressure of the battery cell 20 in which the depressurization mechanism 213 is installed reaches a threshold.

[0164] Figures 10 and 11 show schematic diagrams of the structure of a battery 100 according to one embodiment of the present invention.

[0165] The battery 100 includes a housing 10, a battery cell 20, and a heat conductive member 3a. A housing cavity 10a is provided within the housing 10, and the battery cell 20 is provided within the housing cavity 10a. The battery cell 20 includes a first wall 201 and a second wall 202, with an angle between the first wall 201 and the second wall 202. For example, the first wall 201 and the second wall 202 are installed non-parallel, and the area of ​​the first wall 201 is larger than the area of ​​the second wall 202.

[0166] The battery 100 further includes a heat conductive member 3a, which is provided in the cavity 10a, is installed facing the first wall 201, and the heat conductive member 3a and the first wall 201 are connected by heat conduction, thereby allowing heat exchange between the heat conductive member 3a and the battery cell 20, and the heat conductive member 3a is used to regulate the temperature of the battery cell 20.

[0167] As can be seen from this, a large surface of the battery cell 20, i.e., the first wall 201, and the heat conduction member 3a are connected by heat conduction, and heat exchange exists between the heat conduction member 3a and the battery cell 20 in the housing cavity 10a. Furthermore, the heat exchange area between the heat conduction member 3a and the battery cell 20 is large, thereby effectively utilizing the heat conduction member 3a to conduct heat from the battery cell 20, improving the heat exchange efficiency between the heat conduction member 3a and the battery cell 20, ensuring that the temperature of the battery cell 20 remains in a normal state, and improving the service life and safety performance of the battery cell 20. Moreover, if the battery 100 contains multiple battery cells 20, if thermal runaway occurs in one of the battery cells 20, the heat generated from the runaway battery cell 20 is absorbed by the heat conduction member 3a that exchanges heat with it, lowering the temperature of the runaway battery cell 20, thus avoiding the problem of adjacent battery cells 20 also experiencing thermal runaway, and ensuring the safety performance of the battery cells 20. Of course, the battery 100 may contain only one battery cell 20.

[0168] For example, if the temperature of the battery cell 20 is too high, the heat conduction member 3a may cool the battery cell 20 to lower its temperature. If the temperature of the battery cell 20 is too low, the heat conduction member 3a may heat the battery cell 20 to raise its temperature.

[0169] Exemplary, the battery 100 has multiple battery cells 20, which are arranged along a second direction y, i.e., the second direction y is the direction of arrangement of the multiple battery cells 20 in the row of battery cells 20 in the battery 100. In other words, the row of battery cells 20 in the battery 100 is arranged along the second direction y, and the battery 100 has at least one row of battery cells 20. The number of battery cells 20 in one row of battery cells 20 may be 2 to 20, but the embodiments of the present application are not limited thereto. The heat conductive member 3a extends along the second direction y, and the heat conductive member 3a and the first wall 201 of each battery cell 20 in the multiple battery cells 20 are connected by heat conduction, and the first wall 201 of the battery cell 20 may face the heat conductive member 3a, i.e., the first wall 201 of the battery cell 20 may be parallel to the second direction y.

[0170] The first wall 201 may be in direct contact with the heat conductive member 3a, thereby achieving heat transfer between the battery cell 20 and the heat conductive member 3a, or the first wall 201 may be indirectly in contact with the heat conductive member 3a, for example, the first wall 201 may be in contact with the heat conductive member 3a via a heat conductive member such as a heat conductive adhesive, thereby achieving heat transfer between the battery cell 20 and the heat conductive member 3a. Clearly, the heat conductive connection between the heat conductive member 3a and the first wall 201 means that heat exchange can take place between the first wall 201 and the heat conductive member 3a, and that the heat management capability of the heat conductive member 3a for the battery cell 20 is guaranteed.

[0171] The battery 100 further includes a fixing member 90, which is connected to the second wall 202 and the housing 10, thereby housing the battery cell 20 in a cavity. 10a The fixing member 90 is fixed internally and can support and secure the battery cell 20, thereby strengthening the structural strength of the battery 100. At the same time, the connection between the fixing member 90 and the battery cell 20 does not affect the installation of the heat conductive member 3a and the battery cell 20, making the assembly of the battery 100 easy.

[0172] In some cases, the fixing member 90 can also be referred to as a stabilization assembly.

[0173] In some embodiments, as shown in Figures 5, 6, 9, and 10, the first wall 201 is the wall with the largest surface area in the battery cell 20, and the first wall 201 can be understood as the "large surface" of the battery cell 20, thereby effectively improving the heat exchange area between the heat conduction member 3a and the battery cell 20, and improving the heat exchange efficiency between the heat conduction member 3a and the battery cell 20.

[0174] In some embodiments, the electrode terminals 214 of the battery cell 20 are installed on the second wall 202, and the electrode terminals 214 are provided on a wall other than the first wall 201 of the battery cell 20 that is at an angle with the first wall 201, thereby facilitating the installation of the electrode terminals 214 and simultaneously allowing relief for the electrode terminals 214 and the heat conductive member 3a. This eliminates the need to install a relief section on the heat conductive member 3a for the electrode terminals 214, which is advantageous in simplifying the structure of the heat conductive member 3a.

[0175] For example, if the first wall 201 is the wall with the largest area in the battery cell 20, the second wall 202 is not the wall with the largest area in the battery cell 20, and the electrode terminals 214 are provided on the second wall 202, thereby ensuring the efficiency of temperature control of the heat conductive member 3a with respect to the battery cell 20.

[0176] Selectively, in the example shown in Figure 6, the battery cell 20 may be a blade battery, where the length of the battery cell 20 > the width of the battery cell 20 > the height of the battery cell 20, the length of the battery cell 20 in the second direction y > the width of the battery cell 20 in the vertical direction z > the height of the battery cell 20 in the first direction x, the first wall 201 is located at one end of the battery cell 20 in the height direction, and if the electrode terminals 214 are provided on the second wall 202, the electrode terminals 214 may be located at one or both ends of the battery cell 20 in the length direction, and / or the electrode terminals 214 are located at one or both ends of the battery cell 20 in the width direction.

[0177] In some embodiments, as shown in Figure 5, the second wall 202 is installed intersecting the first wall 201, the first wall 201 and the second wall 202 are not parallel, and the first wall 201 and the second wall 202 share a common line.

[0178] Selectively, the battery cell 20 forms a substantially rectangular parallelepiped structure, and the length of the battery cell 20 is greater than the width and height of the battery cell 20, the first wall 201 is located on one side of the battery cell 20 in the first direction x, and the second wall 202 is on at least one of the two sides of the battery cell 20 in the second direction y, and the second wall 202 is on at least one of the two sides of the battery cell 20 in the vertical direction z, and the electrode terminals 214 may be provided on the second wall 202 of the battery cell 20 in the vertical direction z, and of course, as shown in Figure 6, the electrode terminals 214 may be provided on the second wall 202 of the battery cell 20 in the second direction y. The first direction x, the second direction y, and the vertical direction z are perpendicular to each other in pairs.

[0179] Selectively, in the example shown in Figure 6, the battery cell 20 may be a blade battery, where the length of the battery cell 20 > the width of the battery cell 20 > the height of the battery cell 20, the length of the battery cell 20 in the second direction y > the width of the battery cell 20 in the vertical direction z > the height of the battery cell 20 in the first direction x, the first wall 201 is located at one end of the battery cell 20 in the height direction, and if the electrode terminals 214 are provided on the second wall 202, the electrode terminals 214 may be located at one or both ends of the battery cell 20 in the length direction, and / or the electrode terminals 214 are located at one or both ends of the battery cell 20 in the width direction.

[0180] Naturally, the placement of the electrode terminals 214 is not limited to this in the present invention. As shown in Figures 7 and 8, the electrode terminals 214 of the battery cell 20 may be provided on the first wall 201, and similarly, the arrangement of the electrode terminals 214 is easy; for example, the battery cell 20 is a one-stop battery cell. As can be seen from this, the battery 100 in the embodiment of the present invention offers high flexibility regarding the placement of the electrode terminals 214.

[0181] In some embodiments, as shown in Figure 8, there are multiple battery cells 20, and the multiple battery cells 20 are arranged in a first direction x, and in the first direction x, each battery cell 20 has a first surface 203 that is installed facing the first wall 201. HavingA relief groove 203a is provided on the first surface 203, and the relief groove 203a of one of two adjacent battery cells 20 is used to accommodate the electrode terminals 214 of the other battery cell 20, and the first direction x is perpendicular to the first wall 201, thereby enabling a compact arrangement of multiple battery cells 20 in the first direction and saving occupied space.

[0182] In some embodiments, as shown in Figures 4 to 6, the electrode terminals 214 are provided on the second wall 202, the battery cell 20 includes two opposing first walls 201 and two opposing second walls 202, and at least two electrode terminals 214 are provided, with the plurality of electrode terminals 214 including positive electrode terminals 214a and negative electrode terminals 214b.

[0183] Here, assuming that at least two electrode terminals 214 are installed on the same second wall 202, thereby ensuring that adjacent electrode terminals 214 have an appropriate spacing, it is advantageous to save space occupied by the battery cell 20. Alternatively, at least one electrode terminal 214 is installed on each second wall 202, thereby ensuring that electrode terminals 214 located on different second walls 202 have sufficient spacing.

[0184] For example, in the examples in Figures 4 and 5, the battery cell 20 includes two first walls 201 positioned opposite each other along a first direction x and two second walls 202 positioned opposite each other along a vertical direction z, where the vertical direction z is not parallel to the first direction x, but for example, vertical direction z is perpendicular to the first direction x, and all of the electrode terminals 214 are located on the same second wall 202 in the vertical direction z of the battery cell 20.

[0185] In some embodiments, the electrode terminal 214 is installed on the second wall 202 of the battery cell 20 in the second direction y, or on the second wall 202 of the battery cell 20 in the vertical direction z.

[0186] In the example shown in Figure 11, the electrode terminals 214 are provided on the second wall 202 facing the bottom wall 102 of the housing cavity 10a of the battery cell 20 in the vertical direction.

[0187] Naturally, in a rectangular parallelepiped battery cell 20, the battery cell 20 may include two second walls 202 that are positioned opposite each other along a second direction y, where the second direction y is not parallel to the first direction, for example, the second direction y is perpendicular to the first direction x, and all of the electrode terminals 214 are located on the same second wall 202 in the second direction y of the battery cell 20.

[0188] Even if multiple electrode terminals 214 are located on one side of the battery cell 20 in the second direction y, or on one side of the battery cell 20 in the vertical direction z, if there are multiple battery cells 20 and the multiple battery cells 20 are arranged sequentially along the second direction y, the second walls 202 of two adjacent battery cells 20 face each other in the second direction y.

[0189] In this application, the first wall 201 may be a flat or curved surface, and the second wall 202 is a flat or curved surface.

[0190] In some embodiments, as shown in Figure 9, the first wall 201 is formed in a cylindrical shape, and in this case the battery cell 20 may be a substantially cylindrical battery cell.

[0191] In some embodiments, as shown in Figure 9, when second walls 202 are provided at both axial ends of the first wall 201, and at least one electrode terminal 214 of the battery cell 20 is provided on one of the second walls 202, 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 the other second wall 202. This enables a flexible arrangement of the electrode terminals 214.

[0192] In some embodiments, as shown in Figure 9, an exposed electrode terminal 214 is provided on one of the second walls 202, and the electrode assembly 22 of the battery cell 20 includes a positive electrode sheet 221 and a negative electrode sheet 222, one of which is electrically connected to the electrode terminal 214, and the other of which is electrically connected to the first wall 201, thereby enabling normal power supply to the battery cell 20.

[0193] Naturally, the other of the positive electrode sheet 221 and the negative electrode sheet 222 may be electrically connected to the other second wall 202. In other words, the second wall 202, on which the exposed electrode terminals 214 are provided, differs from the second wall 202 electrically connected to the other of the positive electrode sheet 221 and the negative electrode sheet 222, and similarly achieves normal power supply to the battery cell 20.

[0194] In some embodiments, the battery cell 20 further includes a third wall, the third wall being connected to the first wall 201 and / or the second wall 202, for example, the third wall being connected to the first wall 201 without being connected to the second wall 202, or the third wall being connected to the second wall 202 without being connected to the first wall 201, or the third wall being connected to both the first wall 201 and the second wall 202. When the electrode terminals 214 of the battery cell 20 are located on the third wall, the electrode terminals 214 may be located on any wall other than the first wall 201 and the second wall 202 of the battery cell 20, and connected to one of the first wall 201 and the second wall 202, thereby providing a more flexible arrangement of the electrode terminals 214.

[0195] Selectively, the third wall is connected to the first wall 201 without being connected to the second wall 202, in which case the third wall may be installed adjacent to the first wall 201 and opposite to the second wall 202, but is not limited to this. Alternatively, the third wall is connected to the second wall 202 without being connected to the first wall 201, in which case the third wall may be installed adjacent to the second wall 202 and opposite to the first wall 201, but is not limited to this. Alternatively, the third wall is connected to both the first wall 201 and the second wall 202, in which case the third wall is installed adjacent to both the first wall 201 and the second wall 202.

[0196] In some embodiments, the battery cell 20 includes a third wall that is installed opposite to it, and at least two electrode terminals 214 are installed, and the plurality of electrode terminals 214 include a positive electrode terminal 214a and a negative electrode terminal 214b.

[0197] Here, assuming that at least two electrode terminals 214 are installed on the same third wall, thereby ensuring that adjacent electrode terminals 214 have an appropriate spacing, it is advantageous to save space occupied by the battery cell 20. Alternatively, at least one electrode terminal 214 is installed on each third wall, thereby ensuring that electrode terminals 214 located on different third walls have sufficient spacing.

[0198] Exemplary, the battery cell 20 has a rectangular parallelepiped structure and includes a first wall 201 installed opposite to the first wall along a first direction, a second wall 202 installed opposite to the first wall along a second direction, and a third wall installed opposite to the first wall along a vertical direction. The first direction is perpendicular to the first wall 201, and the first direction, the second direction, and the vertical direction are each perpendicular to each other by two.

[0199] In some embodiments, the area of ​​the third wall is less than or equal to the area of ​​the first wall 201, and / or the area of ​​the third wall is less than or equal to the area of ​​the second wall 202. As can be seen from this, the requirements for the installation position of the third wall are low, which helps to arrange the electrode terminals 214 more flexibly.

[0200] For example, the third wall may be connected to the first wall 201 without being connected to the second wall 202, in which case the area of ​​the third wall may be less than or equal to the area of ​​one of the first wall 201 and the second wall 202; or the third wall may be connected to the second wall 202 without being connected to the first wall 201, in which case the area of ​​the third wall may be less than or equal to the area of ​​one of the first wall 201 and the second wall 202; or the third wall may be connected to both the first wall 201 and the second wall 202, in which case the area of ​​the third wall may be less than or equal to the area of ​​one of the first wall 201 and the second wall 202.

[0201] Exemplary, the battery cell 20 has a rectangular parallelepiped structure and includes a first wall 201 installed opposite to it along a first direction, a second wall 202 installed opposite to it along a second direction, and a third wall installed opposite to it along a vertical direction, wherein the length of the battery cell 20 in the second direction > the width of the battery cell 20 in the vertical direction > the height of the battery cell 20 in the first direction, and in this case, the area of ​​the first wall 201 > the area of ​​the third wall > the area of ​​the second wall 202.

[0202] In some embodiments, at least one battery cell 20 is a soft pack battery cell, and if the battery 100 includes one battery cell 20, that battery cell 20 is a soft pack battery cell, and if the battery 100 includes multiple battery cells 20, at least one of the multiple battery cells 20 is a soft pack battery cell. This allows for a richer variety of battery types, structures, and battery cell layouts 20, which is advantageous in meeting the needs for differentiating the applications of the battery 100.

[0203] In some embodiments, as shown in Figures 4 and 5, the battery cell 20 further includes a pressure reducing mechanism 213, and the pressure reducing mechanism 213 and the electrode terminals 214 of the battery cell 20 are installed on the same wall of the battery cell 20, for example, the pressure reducing mechanism 213 and the electrode terminals 214 are both provided on the second wall 202, or the pressure reducing mechanism 213 and the electrode terminals 214 are both provided on the first wall 201, or the pressure reducing mechanism 213 and the electrode terminals 214 are both provided on the third wall.

[0204] Naturally, in other embodiments of the present invention, the battery cell 20 further includes a pressure reducing mechanism 213, and the pressure reducing mechanism 213 and the electrode terminals 214 of the battery cell 20 are installed on two walls of the battery cell 20, for example, the electrode terminals 214 are provided on the first wall 201 and the pressure reducing mechanism 213 is provided on the second wall 202 or the third wall, or the electrode terminals 214 are provided on the second wall 201 and the pressure reducing mechanism 213 is provided on the first wall 201 or the third wall.

[0205] As a result, the pressure reduction mechanism 213 has a certain degree of flexibility with respect to the position of the electrode terminals 214.

[0206] In some embodiments, the heat conduction member 3a is fixedly connected to the first wall 201, thereby enabling a connection between the heat conduction member 3a and the battery cell 20, and ensuring a secure connection between the battery cell 20 and the heat conduction member 3a. At the same time, if there are at least two battery cells 20 and the first walls 201 of at least two battery cells 20 are connected to the heat conduction member 3a, the at least two battery cells 20 may be integrally connected via the heat conduction member 3a. In this case, side plates do not need to be installed inside the battery 100, and there is no need to install any further structures such as beams, significantly improving the space utilization rate inside the battery 100 and increasing the energy density of the battery 100. In this case, the heat conduction member 3a can also be referred to as a reinforcing element.

[0207] Naturally, the heat conductive member 3a may be fixedly connected to other walls of the battery cell 20, and is not limited to the first wall 201.

[0208] In some embodiments, the heat conductive member 3a is bonded to the first wall 201 via a first adhesive layer. This bonding of the heat conductive member 3a to the first wall 201 ensures a secure and stable connection between the heat conductive member 3a and the battery cell 20, guaranteeing that the entire battery 100 has a certain degree of rigidity and strength. At the same time, it reduces consumables and overall weight, contributing to a lightweight design for the battery 100, and also results in a simpler, more compact structure that is easier to process and assemble.

[0209] Selectively, the first adhesive layer may include a thermally conductive structural adhesive, which not only has good adhesive strength and peel strength but also properties such as thermal conductivity, degradation resistance, fatigue resistance, and corrosion resistance, thereby improving the connection strength and thermal management efficiency between the battery cell 20 and the thermal conductive member 3a, and accelerating heat transfer between the battery cell 20 and the thermal conductive member 3a. Naturally, the first adhesive layer may further include double-sided tape or the like.

[0210] The heat conductive member 3a and the first wall 201 may be connected by other methods such as riveting or welding, and this invention is not limited thereto.

[0211] Selectively, the heat conductive member 3a may be sandwiched between adjacent rows of battery cells 20 by contacting the first wall 201.

[0212] In some embodiments, the bottom of the heat conductive member 3a is bonded to the bottom wall 102 of the housing cavity 10a via a second adhesive layer, thereby achieving a fixed connection between the heat conductive member 3a and the bottom wall 102 of the housing cavity 10a, resulting in a simple structure and easy processing and assembly. In this case, the heat conductive member 3a and the first wall 201 and the housing cavity 10a Bottom wall Each of these is bonded and fixed in place to ensure secure installation of the heat conductive member 3a.

[0213] In some embodiments, the fixing member 90 includes a third adhesive layer, and the second wall 202 of the battery cell 20 is bonded to the housing 10 via the third adhesive layer, thereby achieving a fixed connection between the battery cell 20 and the housing 10. The structure is simple, easy to process and assemble, and simultaneously achieves cooling over a large surface area and fixing over a small surface area.

[0214] Exemplary, the second wall 202 of the battery cell 20 is the bottom wall facing the bottom of the housing cavity 10a of the battery cell 20, and the second wall 202 is bonded to the bottom wall 102 of the housing cavity 10a via a third adhesive layer, thereby achieving a fixed connection between the battery cell 20 and the bottom wall 102 of the housing cavity 10a. In this case, the heat conductive member 3a is bonded and fixed to the first wall 201, and the battery cell 20 is bonded and fixed to the bottom wall 102 of the housing cavity 10a, and the heat conductive member 3a is indirectly fixedly connected to the bottom wall 102 of the housing cavity 10a via the battery cell 20.

[0215] Naturally, the second wall 202 may be a wall facing the side of the housing 10 of the battery cell 20, or the second wall 202 may be a ceiling wall facing the top of the housing 10 of the battery cell 20, in which case the second wall 202 is connected to the housing cavity via the third adhesive layer. 10a It is attached to the ceiling wall 101.

[0216] Optionally, the battery 100 may further include a strip, which is fixedly connected to the housing 10, and the top of the battery cell 20 is fixedly connected to the top of the housing 10 via the strip, by bonding and fixing the strip to the top wall of the housing 10 facing the top of the battery cell 20. Of course, the strip does not need to be installed if the fixing strength of the fixing (e.g., by bonding) between the battery cell 20 and the housing 10 meets the requirements.

[0217] For example, the battery 100 includes a plurality of battery groups 20A arranged sequentially along a first direction, each battery group 20a includes a plurality of battery cells 20 arranged along a second direction y, the strip extends along the first direction, and each strip may be bonded and fixed to one of the battery cells 20 in each battery group 20A.

[0218] In some embodiments, the bottom of the heat conductive member 3a is bonded to the bottom wall 102 of the housing cavity 10a via a second adhesive layer, and the fixing member 90 includes a third adhesive layer, and the second wall 202 of the battery cell 20 is bonded to the housing 10 via the third adhesive layer.

[0219] In some embodiments, at least a portion of the heat from the battery cell 20 can be transferred to the heat conduction member 3a via 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, thereby ensuring a secure connection between the battery cell 20 and the heat conduction member 3a, and a secure connection between the heat conduction member 3a and the bottom wall 102 of the housing cavity 10a. This is advantageous in reducing the thermal resistance in heat conduction between the battery cell 20 and the heat conduction member 3a, and ensuring the heat conduction efficiency between the battery cell 20 and the heat conduction member 3a.

[0220] In some embodiments, the thickness of the first adhesive layer is less than or equal to the thickness of the third adhesive layer, thereby ensuring a secure connection between the battery cell 20 and the heat conductive member 3a and the housing 10, respectively. This is also advantageous in reducing the thermal resistance in heat conduction between the battery cell 20 and the heat conductive member 3a, and in ensuring the heat conduction efficiency between the battery cell 20 and the heat conductive member 3a.

[0221] In some embodiments, the thickness of the first adhesive layer is less than or equal to the thickness of the second adhesive layer, and the thickness of the first adhesive layer is less than or equal to the thickness of the third adhesive layer. By rationally setting the thicknesses of the first adhesive layer, the second adhesive layer, and the third adhesive layer, it is ensured that the adhesive is rationally distributed and utilized, thereby realizing secure installation of the battery cell 20 and the heat conductive member 3a within the housing cavity 10a.

[0222] In some embodiments, the thermal conductivity of the first adhesive layer is greater than or equal to that of the second adhesive layer, allowing at least a portion of the heat from the battery cell 20 to be transferred to the heat conduction member 3a via the first adhesive layer. This is advantageous in reducing the thermal resistance in heat conduction between the battery cell 20 and the heat conduction member 3a, while ensuring a secure connection between the battery cell 20 and the heat conduction member 3a, and a secure connection between the heat conduction member 3a and the housing 10, thereby ensuring the heat conduction efficiency between the battery cell 20 and the heat conduction member 3a.

[0223] In some embodiments, the thermal conductivity of the first adhesive layer is greater than or equal to that of the third adhesive layer, thereby ensuring a secure connection between the battery cell 20 and the heat conduction member 3a and the housing 10, respectively. This is also advantageous in reducing the thermal resistance in heat conduction between the battery cell 20 and the heat conduction member 3a, thereby ensuring the heat conduction efficiency between the battery cell 20 and the heat conduction member 3a.

[0224] Naturally, some of the heat from the battery cell 20 can be transferred to and dissipated from the housing 10 via the third adhesive layer.

[0225] 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 3 The thermal conductivity of the adhesive layer is greater than that of the adhesive layer, thereby enabling the rational distribution and utilization of the adhesive, ensuring the stable installation of the battery cell 20 and the heat conductive member 3a, and simultaneously ensuring the rapid dissipation of heat from the battery cell 20.

[0226] In some embodiments, the ratio between the thickness of the first adhesive layer and the thermal conductivity of the first adhesive layer is the first ratio, the ratio between the thickness of the second adhesive layer and the thermal conductivity of the second adhesive layer is the second ratio, and the ratio between the thickness of the third adhesive layer and the thermal conductivity of the third adhesive layer is the third ratio.

[0227] Here, 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. This ensures that the heat exchange effect of the battery cell 20 is guaranteed, while enabling the effective and rational use of the adhesive and achieving a rational distribution of the adhesive.

[0228] 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, respectively.

[0229] In some embodiments, the battery 100 includes a plurality of battery modules 100a, each battery module 100a including at least one row of battery groups 20A and at least one heat conduction member 3a, the battery group 20A including a plurality of battery cells 20 arranged in a row along a second direction y, and the first wall 201 of each battery cell 20 of the battery group 20A is fixed to and heat conduction connected to the heat conduction member 3a. There may be a plurality of battery groups 20A and heat conduction members 3a, and the plurality of battery groups 20A and plurality of heat conduction members 3a are arranged alternately along a first direction x, the first direction being perpendicular to the first wall 201.

[0230] Selectively, the battery module 100a includes N sets of battery groups 20A and N-1 heat conduction members 3a, where the heat conduction members 3a are placed between two adjacent sets of battery groups 20A, and N is an integer greater than 1. For example, if N is 2, the multiple battery modules 100a are arranged along a first direction x, with gaps between adjacent battery modules 100a. Naturally, the heat conduction members 3a may be provided between the battery groups 20A and the inner wall of the housing 10.

[0231] In some embodiments, a row of battery cells 20 arranged along a second direction y may have only one side in the first direction x connected to the heat conductive member 3a, or both sides in the first direction x connected to the heat conductive member 3a, and the embodiments of the present application are not limited thereto.

[0232] In some embodiments, the heat conduction member 3a is used to exchange heat with the battery cell 20, thereby ensuring that the battery cell 20 is at an appropriate temperature. In this case, the heat conduction member 3a may also be called the heat management member 3b, and the heat management member 3b is also used to exchange heat with the battery cell 20, thereby ensuring that the battery cell 20 is at an appropriate temperature.

[0233] In some embodiments, the heat conduction member 3a includes metallic and / or non-metallic materials, allowing for flexible material selection and installation of the heat conduction member 3a. In addition to enabling the heat conduction member 3a to have good heat conduction capacity, it also possesses other desirable properties, better meeting the needs for application differentiation.

[0234] In some embodiments, as shown in Figures 10 to 13, the heat conduction member 3a includes a metal plate 31 and an insulating layer 32, with the insulating layer 32 being installed on the surface of the metal plate 31. By installing it in this way, the metal plate 31 can ensure the strength of the heat conduction member 3a, and the insulating layer 32 can make the surface connected to the first wall 201 of the heat conduction member 3a an insulating surface, thereby avoiding electrical connection between the metal plate 31 and the battery cell 20 and ensuring electrical insulation in the battery 100.

[0235] Selectively, the insulating layer 32 may be an insulating film adhered to the surface of the metal plate 31, or an insulating paint applied to the surface of the metal plate 31.

[0236] In some embodiments, the heat conduction member 3a is a non-metallic material plate, meaning the entire heat conduction member 3a is a non-metallic insulating material. Naturally, in those embodiments, a portion of the heat conduction member 3a is made of a non-metallic material.

[0237] In some embodiments, as shown in Figures 14, 15 and 30, there are multiple battery cells 20, and the multiple battery cells 20 are arranged along a second direction y, the heat conductive member 3a includes a partition plate 33, the partition plate 33 extends along the second direction y, and the partition plate 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.

[0238] As a result, the first wall 201 with the largest surface area of ​​each of the multiple battery cells 20 is connected to the partition plate 33, and the multiple battery cells 20 are connected integrally via the partition plate 33, eliminating the need to install side plates inside the battery 100 and the need to install additional structures such as beams, thereby significantly improving the space utilization rate inside the battery 100 and improving the energy density of the battery 100.

[0239] As batteries are used, the blue film on the surface of the battery cells becomes more susceptible to damage. When the blue film is damaged, insulation failure occurs between adjacent battery cells and between the battery cells and the housing, increasing the risk of a short circuit. Furthermore, to regulate the temperature of the battery cells, water cooling plates or heating plates are installed between adjacent battery cells. The surface of these plates lacks insulating protection, and water vapor inside the battery easily liquefies on the surface of the water cooling plates or heating plates. If the blue film is damaged, the risk of a short circuit increases even further.

[0240] Considering the above, in order to mitigate the problem of the battery short-circuiting due to damage to the blue film, the inventors conducted extensive research and found that the heat conductive member 3a is further configured to include an insulating layer 32, and the insulating layer 32 is used to insulate and isolate the first wall 201 of the battery cell 20 from the partition plate 33.

[0241] The insulating layer 32 is installed on the surface of the partition plate 33, making it less susceptible to damage caused by the expansion of the battery cell's outer shape or self-heating. If the surface of the battery cell lacks an insulating structure or the blue film on the surface of the battery cell is damaged, and water vapor inside the battery cell liquefies on the surface of the partition plate, the insulating layer 32 installed on the surface of the partition plate 33 provides insulation between the battery cell 20 and the partition plate 33. This effectively mitigates the problem of short circuits in the battery 100 caused by damage to the blue film of the battery cell 20 or liquefaction of water vapor on the surface of the partition plate 33, thereby reducing the risk of short circuits in the battery 100 and improving the safety of power use in power consumption devices.

[0242] The insulating layer 32 is connected to the surface of the partition plate 33, thereby allowing the insulating layer 32 to cover part or all of the surface of the partition plate 33.

[0243] In some embodiments, the partition plate 33 is used to exchange heat with the battery cell 20, in which case the partition plate 33 can also be called a thermal management member. The thermal management member is a structure that exchanges heat with the battery cell 20 and includes a resistive heating wire, a heat conductive member through which the heat exchange medium passes, and a material that generates a chemical reaction and causes a temperature change in response to changes in the environment in which it is located. Heat exchange with the battery cell 20 is achieved by the temperature change of the thermal management member itself. In this case, if the temperature of the thermal management member is lower than the temperature of the battery cell 20, the thermal management member cools the battery cell 20, preventing thermal runaway due to the battery cell 20 being too hot. If the temperature of the thermal management member is higher than the temperature of the battery cell 20, the thermal management member heats the battery cell 20, ensuring the normal operation of the battery 100.

[0244] The thermal management member may have a structure capable of containing a fluid medium, and heat is transferred between the battery cell 20 and the fluid medium via the thermal management member and the insulating layer 32, thereby achieving heat exchange between the battery cell 20 and the fluid medium. The fluid medium may be a liquid (e.g., water) or a gas (e.g., air). In this case, if the temperature of the fluid medium contained inside the thermal management member is lower than the temperature of the battery cell 20, the thermal management member cools the battery cell 20, preventing thermal runaway of the battery cell 20 due to excessively high temperature. If the temperature of the fluid medium contained inside the thermal management member is higher than the temperature of the battery cell 20, the thermal management member heats the battery cell 20, ensuring the normal operation of the battery 100.

[0245] Selectively, the partition plate 33 may be installed on one side of the battery cell 20 and located between the battery cell 20 and the housing 10, or it may be provided between two adjacent battery cells 20.

[0246] In some embodiments, the insulating layer 32 may insulate and isolate only the battery cell 20 from the partition plate 33. In other embodiments, the insulating layer 32 may not only insulate and isolate the battery cell 20 from the partition plate 33, but also insulate and isolate the partition plate 33 from the inner wall of the housing 10, further reducing the risk of short-circuiting the battery 100 and thereby further improving the safety of the battery 100.

[0247] For example, multiple battery cells 20 are stacked along a first direction x, a partition plate 33 is placed between two adjacent battery cells 20, and insulating layers 32 are provided on opposite sides of the partition plate 33, so that each battery cell 20 and the partition plate 33 in two adjacent battery cells 20 are insulated and isolated via the insulating layers 32.

[0248] For example, a partition plate 33 may be installed between the two battery cells 20 located at the outermost ends and the inner wall of the housing 10, along the stacking direction of the multiple battery cells 20. The insulating layer 32 connected to the partition plate 33 can insulate and isolate only the battery cells 20 and the partition plate 33. Naturally, the insulating layer 32 connected to the partition plate 33 can not only insulate and isolate the battery cells 20 and the partition plate 33, but can also insulate and isolate the partition plate 33 and the inner wall of the housing 10, further reducing the risk of a short circuit in the battery 100 and thereby further improving the safety of the battery 100.

[0249] In some embodiments, the thermal conductivity λ of the insulating layer 32 is 0.1 W / (m·K) or higher, and the insulating layer 32 has good thermal conductivity, thereby enabling the insulating layer 32 to perform a heat transfer function, providing good thermal conductivity between the battery cell 20 and the partition plate 33, improving the heat exchange efficiency between the battery cell 20 and the partition plate 33, and, for example, if the partition plate 33 is a thermal management member 3b, it helps to effectively ensure that the battery cell 20 is at an appropriate temperature.

[0250] Thermal conductivity refers to the heat transferred per hour through an area of ​​1 square meter in a 1 m thick material under stable thermal conduction conditions, when the temperature difference between its two sides is 1 degree (K, °C). Its unit is watts per meter·degree (W / (m·K), where K can be replaced with °C).

[0251] In some embodiments, the density of the insulating layer 32 is G ≤ 1.5 g / cm³. 3 That is the case.

[0252] When the insulating layer 32 is placed on the surface of the partition plate 33, the weight of the battery 100 increases. The lower the density of the insulating layer 32, the lower the mass of the insulating layer 32, and the higher the density of the insulating layer 32, the higher the mass of the insulating layer 32. The density of the insulating layer 32 is G ≤ 1.5 g / cm³. 3 Therefore, the weight of the insulating layer 32 is small, which reduces the weight of the battery 100, thereby reducing the impact of the insulating layer 32 on the weight of the battery 100 and making it advantageous for reducing the weight of the battery 100.

[0253] In some embodiments, the compressive strength P of the insulating layer 32 satisfies 0.01 MPa ≤ P ≤ 200 MPa, giving the insulating layer 32 a certain elasticity. When the battery cell 20 expands and deforms, the insulating layer 32 deforms itself, thereby reducing the impact on the entire battery 100. Alternatively, when the battery 100 is subjected to impact, the elastic insulating layer 32 deforms itself, providing a buffering effect, thus providing a certain level of protection to the battery cell 20 and improving the safety of the battery 100.

[0254] Compressive strength refers to the maximum compressive stress a sample experiences before it fractures or yields during a compression test.

[0255] There are various 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.

[0256] The insulating layer 32 may consist of only one of polyethylene terephthalate, polyimide, or polycarbonate. In another embodiment, the insulating layer 32 may consist of two or three of polyethylene terephthalate, polyimide, or polycarbonate. For example, the insulating layer 32 includes a first insulating layer and a second insulating layer that are laminated together, wherein the first insulating layer is made of polyethylene terephthalate and the second insulating layer is made of polyimide, or the first insulating layer is made of polyimide and the second insulating layer is made of polycarbonate, or the first insulating layer is made of polyethylene terephthalate and the second insulating layer is made of polycarbonate. In some other embodiments, the insulating layer 32 includes a first insulating layer, a second insulating layer, and a third insulating layer that are laminated together, wherein the first insulating layer is made of polyethylene terephthalate, the second insulating layer is made of polyimide, and the third insulating layer is made of polycarbonate.

[0257] Polyethylene terephthalate, polyimide, and polycarbonate have advantages such as high impact strength and high heat degradation resistance. Therefore, the insulating layer 32 is made of at least one of polyethylene terephthalate, polyimide, and polycarbonate, and the insulating layer 32 has advantages such as high impact strength and high heat degradation resistance. Furthermore, the thermal conductivity of polyethylene terephthalate is generally 0.24 W / m·K, the thermal conductivity of polyimide is generally 0.1 to 0.5 W / m·K, and the thermal conductivity of polycarbonate is generally 0.16 to 0.25 W / m·K. Therefore, all three materials have good thermal conductivity, and when the insulating layer 32 is formed using at least one of the three materials, the insulating layer 32 has good thermal conductivity, improving the heat exchange performance and heat exchange efficiency between the battery cell 20 and the partition plate 33.

[0258] There are many ways in which the insulating layer 32 can be connected to the partition plate 33. For example, in some embodiments, the insulating layer 32 is a coating layer applied to the surface of the partition plate 33. That is, the insulating layer 32 is connected to the partition plate 33 by being applied. 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 layer applied to the surface of the partition plate 33, which makes the bond between the insulating layer 32 and the partition plate 33 tighter, thereby improving the stability of the connection between the insulating layer 32 and the partition plate 33 and reducing the risk of the insulating layer 32 detaching from the partition plate 33.

[0259] In another embodiment, the insulating layer 32 and the partition plate 33 are connected via an adhesive layer. The adhesive layer may be an adhesive layer provided on the insulating layer 32 and / or the partition plate 33. After the adhesive layer adheres the partition plate 33 and the insulating layer 32, the adhesive layer is located between the partition plate 33 and the insulating layer 32. In this case, the insulating layer 32 may or may not be connected to the battery cell 20 via another adhesive layer. Connecting the insulating layer 32 and the partition plate 33 via an adhesive layer is a simple method of connection.

[0260] Furthermore, in another embodiment, the insulating layer 32 is potted between the partition plate 33 and the battery cell 20. Potting is a process in which a liquid composite is injected into the device by mechanical or manual means and cured into a high-performance thermosetting polymer insulating material under room temperature or heated conditions. By installing the insulating layer 32 between the partition plate 33 and the battery cell 20 using the potting method, the integrity of the overall structure formed from the battery cell 20, the insulating layer 32, and the partition plate 33 can be enhanced, improving its ability to resist external shocks and vibrations.

[0261] In some embodiments, as shown in Figure 14, the dimension T1 of the partition plate 33 in the first direction x is less than 0.5 mm, and the first direction x is perpendicular to the first wall 201. This prevents the dimension of the partition plate 33 in the first direction x from being too large and excessively occupying space inside the battery 100, further improving the space utilization rate inside the battery 100 and increasing the energy density of the battery 100.

[0262] In some embodiments, in the vertical direction, the partition plate 33 has a first part, a second part, and a third part that are installed in order, the distance between the first part and the ceiling wall of the battery cell 20 is 1 / 4 or less of the vertical height of the battery cell 20, the distance between the third part and the ceiling wall of the battery cell 20 is 1 / 4 or less of the vertical height of the battery cell 20, and the dimension of the third part in the first direction x is T1.

[0263] In some embodiments, the dimension T1 of the partition plate 33 in the first direction x is 0.05 mm or more. This avoids a situation where the dimension of the partition plate 33 in the first direction x is too small, i.e., the thickness of the partition plate 33 is small, resulting in insufficient rigidity of the partition plate 33 and failure to meet the strength requirements of the battery 100.

[0264] In some embodiments, as shown in Figure 14(c), an insulating layer 32 is provided on the surface of the partition plate 33 to prevent electrical connection between the partition plate 33 and the battery cell 20, thereby improving the safety of the battery 100. Selectively, the insulating layer 32 may be an insulating film adhered to the surface of the partition plate 33, or an insulating paint applied to the surface of the partition plate 33.

[0265] In some embodiments, the dimension T2 of the insulating layer 32 in the first direction x satisfies 0.01 mm ≤ T2 ≤ 0.3 mm.

[0266] If the dimension T2 of the insulating layer 32 in the first direction x is too small, the insulating layer 32 cannot effectively prevent the battery cell 20 and the partition plate 33 from being electrically connected, resulting in an insulation failure in the battery 100 and posing a safety risk. If the dimension T2 of the insulating layer 22 in the first direction x is too large, it excessively occupies space inside the battery 100, which is detrimental to improving the energy density of the battery 100. Therefore, by setting the value of T2 to 0.01 mm to 0.3 mm, it is possible to not only improve the energy density of the battery 100 but also ensure the safety of the battery 100.

[0267] In the embodiment of the present invention, the voltage E of the battery 100 and the dimension T2 of the insulating layer 32 in the first direction x are 0.01 × 10 -3 mm / V ≤ T2 / E ≤ 3 × 10 -3 Satisfying mm / V

[0268] The insulating effect of the insulating layer 32 is related not only to the thickness of the insulating layer 32 but also to the thickness of the insulating layer 32 corresponding to a unit voltage. If T2 / E is too small, that is, if the dimension T2 of the insulating layer 32 in the first direction x for a unit voltage is too small, the insulating layer 32 cannot effectively prevent the battery cell 20 and the partition plate 33 from being electrically connected, resulting in an insulation failure in the battery 100 and posing a safety risk. If T2 / E is too large, that is, if the dimension T2 of the insulating layer 32 in the first direction x for a unit voltage is too large, it will excessively occupy space inside the battery 100, which is detrimental to improving the energy density of the battery 100. Therefore, the value of T2 / E should be 0.01 × 10⁻⁶. -3 ~3×10 -3 By setting it to mm / V, not only can the energy density of battery 100 be improved, but the safety of battery 100 can also be guaranteed.

[0269] In some embodiments, the surface area S1 of the partition plate 33 connected to the first wall 201 of multiple battery cells 20 and the total area S2 of the first wall 201 of the multiple battery cells 20 connected to the same side of the partition plate 33 satisfy 0.25 ≤ S1 / S2 ≤ 4, where S1 = H1 * L1 and S2 = H2 * L2. As shown in Figure 15, H1 is the dimension of the partition plate 33 in the third direction, L1 is the dimension of the partition plate 33 in the second direction y, H2 is the dimension of a single battery cell 20 in the third direction, and L2 is the sum of the dimensions of multiple battery cells 20 in the second direction y. The third direction in this application may also be the vertical direction z.

[0270] If the value of S1 / S2 is too small, that is, if the surface area S1 of the partition plate 33 connected to the first wall 201 of the multiple battery cells 20 is much smaller than the total area S2 of the first wall 201 of the multiple battery cells 20 connected to the same side of the partition plate 33, the contact area between the first wall 201 and the partition plate 33 is too small, and the strength requirements of the battery 100 cannot be met. If the value of S1 / S2 is too large, that is, if the surface area S1 of the partition plate 33 connected to the first wall 201 is much larger than the total area S2 of the first wall 201 of the multiple battery cells 20 connected to the same side of the partition plate 33, the partition plate 33 occupies an excessive amount of space inside the battery 100 compared to the battery cells 20, which is detrimental to improving the energy density of the battery 100, and therefore S1 / S2 value By setting this to 0.25-4, it is possible to not only improve the energy density of battery 100 but also improve the strength of battery 100.

[0271] In some embodiments, as shown in Figure 15, in the third direction, the dimension H1 of the partition plate 33 and the dimension H2 of the first wall 201 of the battery cell 20 satisfy 0.2 ≤ H1 / H2 ≤ 2, and the third direction is perpendicular to the first direction x and the second direction y.

[0272] If H1 / H2 is too small, that is, in the third direction, the dimension H1 of the partition plate 33 is much smaller than the dimension H2 of the first wall 201 of the battery cell 20, the contact area between the first wall 201 and the partition plate 33 is too small, and the strength requirements of the battery 100 cannot be met. If H1 / H2 is too large, that is, in the third direction, the dimension H1 of the partition plate 33 is much larger than the dimension H2 of the first wall 201 of the battery cell 20, the partition plate 33 occupies an excessive amount of space inside the battery 100 compared to the battery cell 20, which is detrimental to improving the energy density of the battery 100. Therefore, by setting the value of H1 / H2 to 0.2~2, it is possible to improve not only the energy density of the battery 100 but also the strength of the battery 100.

[0273] In some embodiments, as shown in Figure 15, in the second direction y, the dimension L1 of the partition plate 33 and the dimension L2 of the multiple battery cells 20 satisfy 0.5 ≤ L1 / L2 ≤ 2.

[0274] If L1 / L2 is too small, that is, in the second direction y, the dimension L1 of the partition plate 33 is much smaller than the dimension L2 of the first wall 201 of the battery cell 20, the contact area between the first wall 201 and the partition plate 33 is too small, and the strength requirements of the battery 100 cannot be met. If H1 / H2 is too large, that is, in the second direction y, the dimension H1 of the partition plate 33 is much larger than the dimension L2 of the first wall 201 of the battery cell 20, the partition plate 33 occupies an excessive amount of space inside the battery 100 compared to the battery cell 20, which is detrimental to improving the energy density of the battery 100. Therefore, by setting the value of L1 / L2 to 0.5~2, it is possible to not only improve the energy density of the battery 100 but also improve the strength of the battery 100.

[0275] Selectively, a fixing structure 103 is installed at the end of the partition plate 33 in the second direction y, and the fixing structure 103 is connected to a fixing member 104 at the end of the partition plate 33 in the second direction y, thereby fixing the partition plate 33.

[0276] Using the battery cells 20 and partition plates 33 shown in Figure 14, a vibration and shock resistance test of the partition plates was conducted according to the GB38031-2020 standard "Safety Requirements for Power Storage Batteries for Electric Vehicles," and the test results are shown in Table 1. In Table 1, T1 is the dimension of the partition plate in the first direction x, H1 is the dimension of the partition plate in the third direction, L1 is the dimension of the partition plate in the second direction y, H2 is the dimension of a single battery cell in the third direction, L2 is the sum of the dimensions of multiple battery cells in the second direction y, and S1 = H1 * L1, S2 = H2 * L2.

[0277] [Table 1]

[0278] Using the battery cell 20 and partition plate 33 shown in Figures 14 and 15, and referring to IEC60664-1, the dielectric strength of the partition plate was tested under the conditions that 1000VDC was applied in the insulation test and the insulation resistance value was ≥ 500MΩ, and 2700VDC was applied and sustained for 60S in the withstand voltage test and the leakage current was ≤ 1mA. The test results are shown in Table 2. In Table 2, T2 is the dimension of the insulating layer in the first direction x, and E is the battery voltage.

[0279] [Table 2]

[0280] In some embodiments, as shown in Figures 30 and 31, the dimension T1 of the partition plate 33 in the first direction x is greater than 5 mm, and the first direction is perpendicular to the first wall 201, thereby ensuring that the partition plate 33 has high reliability in use.

[0281] For example, as shown in Figure 30, the battery 10 includes a plurality of battery cells 20 and a partition plate 33 arranged along a second direction Y, the partition plate 33 extending along the second direction Y and connected to the first wall 201 of each battery cell 20 in the plurality of battery cells 20.

[0282] In some embodiments, the dimension T1 of the partition plate in the first direction x is 100 mm or less.

[0283] If the dimension T1 of the partition plate in the first direction x is too large, it will excessively occupy space inside the battery 100, which is detrimental to improving the energy density of the battery 100. Therefore, by setting the value of T1 to 100 mm or less, the energy density of the battery 100 can be effectively improved.

[0284] In some embodiments, as shown in Figure 31, the dimension T1 of the partition plate 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.

[0285] If T1 / T3 is too small, that is, if the dimension T1 of the partition plate 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 plate 33 has a low ability to absorb deformation and does not match the amount of expansion deformation of the battery cell 20, thus reducing the performance of the battery cell 20. If T1 / T3 is too large, that is, if the dimension T1 of the partition plate 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 plate 33 has a high ability to absorb deformation and far exceeds the expansion deformation space required for the battery cell 20. As a result, the partition plate 33 occupies an excessive amount of space inside the battery 10 compared to the battery cell 20, which is detrimental to improving the energy density of the battery 10. Therefore, by setting the value of T1 / T3 to 0.04~2, it is possible not only to improve the energy density of the battery 10 but also to absorb the amount of expansion deformation of the battery cell 20.

[0286] In some embodiments, an insulating layer 32 is installed on the outer surface of the partition plate 33, and the dimension T2 of the insulating layer 32 along the first direction x is 0.01 mm to 0.3 mm.

[0287] The installation of an insulating layer 32 on the outer surface of the partition plate 33 prevents the battery cells 20 and the partition plate 33 from being electrically connected, thereby improving the safety of the battery 10. If the dimension T2 of the insulating layer 31 in the first direction x is too small, the insulating layer 32 cannot effectively prevent the battery cells 20 and the partition plate 33 from being electrically connected, resulting in an insulation failure in the battery 100. If the dimension T2 of the insulating layer 32 in the first direction x is too large, it excessively occupies space inside the battery 100, which is detrimental to improving the energy density of the battery 100. Therefore, by setting the value of T2 to 0.01 mm to 0.3 mm, it is possible not only to improve the energy density of the battery 100 but also to ensure effective insulation between the battery cells 20 and the partition plate 33.

[0288] Selectively, a flow collector 106 is installed at the end of the partition plate 33 in the second direction y, and piping 107 is installed inside the battery 100, with piping 107 used for transporting fluid and flow collector 106 used for collecting fluid. For example, the connecting pipe module 42 described later may include piping 107.

[0289] The battery cells 20 and partition plates 3333 shown in Figures 30 to 34 were used in a cycle-accelerated endurance experiment, in which 1C / 1C charge-discharge cycles were performed at 60°C until the capacity decayed to 80% of the State of Charge (SOC). The results are shown in Table 3. In Table 3, T1 is the dimension of the partition plate in the first direction x, and T3 is the dimension of the battery cell in the first direction x.

[0290] [Table 3]

[0291] In some embodiments, as shown in Figures 10 to 13, the heat conduction member 3a is fixedly connected to the first wall 201 of one or more battery cells 20. Therefore, in order to guarantee the performance of the battery 100, the heat conduction member 3a must also meet strength requirements. The dimensions of the heat conduction member 3a in the first direction x are set to 0.1 to 100 mm, and the first direction is perpendicular to the first wall 201, thereby satisfying both strength and space requirements.

[0292] Specifically, when the dimension T5 of the heat conduction member 3a in the first direction, i.e., the thickness of the heat conduction member 3a, is large, the strength of the heat conduction member 3a is high, and when T5 is small, the occupied space is small. When T5 < 0.1 mm, the heat conduction member 3a is easily damaged by external forces, and when T5 > 100 mm, it occupies space excessively, affecting the energy density. Therefore, when the dimension T5 of the heat conduction member 3a in the first direction x is between 0.1 and 100 mm, it is possible to improve space utilization while guaranteeing strength.

[0293] In some embodiments, in battery 100, the heat conduction member 3a is installed so as to be thermally conductively connected to the first wall 201 with the largest surface area of the battery cell 20, and is thereby used to conduct the heat of the battery cell 20. The surface of the heat conduction member 3a connected to the first wall 201 is an insulating surface, thereby avoiding the electrical connection between the heat conduction member 3a and the battery cell 20 and ensuring the electrical insulation in the battery 100. The dimension in the first direction x perpendicular to the first wall 201 of the heat conduction member 3a is 0.1 to 100 mm. Here, the heat conduction member 3a includes a partition plate 33, and the partition plate 33 is connected to the first wall 201 of each battery cell 20 among the plurality of battery cells 20 arranged along the second direction y, and the second direction is parallel to the first wall 201. Thereby, it is not necessary to further install a structure such as a beam at the central portion of the housing 10 of the battery 100, and the space utilization rate inside the battery 100 can be maximally improved, thereby improving the energy density of the battery 100. At the same time, the electrical insulation and heat conduction in the battery 100 can be ensured by using the heat conduction member 3a. Therefore, the technical solution of the embodiments of the present application can improve the energy density of the battery 100, and at the same time ensure the electrical insulation and heat conduction in the battery 100, thereby improving the performance of the battery 100.

[0294] In some embodiments, the dimension T3 of the battery cell 20 in the first direction x and the dimension T5 of the heat conduction member 3a in the first direction x satisfy 0 < T5 / T3 ≤ 7.

[0295] When T5 / T3 is too large, the heat conduction member 3a occupies a large space and affects the energy density. Also, if the heat conduction of the heat conduction member to the battery cell 20 is too fast, there may be safety problems. For example, when one battery cell 20 undergoes thermal runaway, there is a possibility that thermal runaway may be caused in other battery cells 20 connected to the same heat conduction member. If 0 < T5 / T3 ≤ 7, the energy density of the battery 100 can be ensured and the safety performance of the battery 100 can be ensured.

[0296] In some embodiments, by further satisfying 0 < T5 / T3 ≤ 1, where T3 is the dimension of the battery cell 20 in the first direction x and T5 is the dimension of the heat conduction member 3a in the first direction x, the energy density of the battery 100 is further improved and the safety performance of the battery 100 is guaranteed.

[0297] In an alternative embodiment, the weight M1 of the battery cell 20 and the weight M2 of the heat conduction member 3a satisfy 0 < M2 / M1 ≤ 20.

[0298] If M2 / M1 is too large, the weight energy density is lost. If 0 < M2 / M1 ≤ 20, the weight energy density of the battery 100 can be guaranteed and the safety performance of the battery 100 can be guaranteed.

[0299] Optionally, in one embodiment of the present application, the weight M1 of the battery cell 20 and the weight M2 of the heat conduction member 3a further satisfy 0.1 ≤ M2 / M1 ≤ 1, thereby further improving the energy density of the battery 100 and guaranteeing the safety performance of the battery 100.

[0300] In some embodiments, the area S3 of the first wall 201 and the surface area S4 of the heat conduction member 3a connected to the first wall 201 of a plurality of battery cells 20 in one row satisfy 0.2 ≤ S4 / S3 ≤ 30.

[0301] S4 is the total surface area of the side of the heat conduction member 3a connected to the battery cell 20. If S4 / S3 is too large, it affects the energy density. If S4 / S3 is too small, the heat conduction effect is poor and it affects the safety performance. If 0.2 ≤ S4 / S3 ≤ 30, the energy density of the battery 10 can be guaranteed and the safety performance of the battery 10 can be guaranteed.

[0302] Optionally, S4 and S3 further satisfy 2 ≤ S4 / S3 ≤ 10, thereby further improving the energy density of the battery 100 and guaranteeing the safety performance of the battery 100.

[0303] In some embodiments, the specific heat capacity C of the heat conduction member 3a and the weight M3 of the heat conduction member 3a are 0.02 KJ / (kg2 *°C) ≤ C / M3 ≤ 100 KJ / (kg 2 satisfies *°C).

[0304] C / M3 < 0.02 KJ / (kg 2 When it is *°C), the heat conduction member 3a absorbs a lot of energy, and the temperature of the battery cell 20 may become too low, and lithium may be deposited. When C / M3 > 100 KJ / (kg 2 In the case of *°C), the heat conduction ability of the heat conduction member 3a is low, and heat cannot be taken away immediately. 0.02 KJ / (kg 2 *°C) ≤ C / M3 ≤ 100 KJ / (kg 2 If it is *°C), the safety performance of the battery 100 can be guaranteed.

[0305] Optionally, C and M3 further 0.3 KJ / (kg 2 *°C) ≤ C / M3 ≤ 20 KJ / (kg 2 satisfies the relationship of *°C), thereby further improving the safety performance of the battery 100.

[0306] In some embodiments, the battery 100 may include a plurality of battery modules 100a. The battery module 100a may include at least one row of a plurality of battery cells 20 arranged along the second direction y and at least one heat conduction member 3a arranged alternately in the first direction x. That is, in each battery module 100a, the battery cell row and the heat conduction member 3a therein are arranged alternately in the first direction x, and the plurality of battery modules 100 are housed in the housing 10 to form the battery 100.

[0307] Selectively, the battery module 100a includes two rows of battery cells 20, with one heat conductive member 3a installed within each of the two rows of battery cells 20. No heat conductive member 3a is installed between adjacent battery modules 100a, thereby reducing the number of heat conductive members 3a installed within the battery 100 while simultaneously ensuring that each battery cell 20 is connected to a heat conductive member 3a.

[0308] If, selectively, multiple battery modules 100 are arranged along a first direction x, with gaps between adjacent battery modules 100, and there are no heat conductive members 3a between adjacent battery modules 100, then the gaps between adjacent battery modules 100a can provide expansion space for the battery cell 20.

[0309] Selectively, a fixing structure 103 is installed at the end of the heat conduction member 3a in a first direction x, and the heat conduction member 3a is fixed to the housing 10 via the fixing structure 103. As shown in Figure 19, the fixing structure 103 may include a fixing member 104, which is fixedly connected to the end of the heat conduction member 3a and is also connected to a battery cell 20 located at the end of the heat conduction member 3a, thereby enhancing the fixing effect of the battery cell 20.

[0310] Selectively, the battery cells 20 may be bonded and fixed to the housing 11. Selectively, adjacent battery cells 20 in each row of battery cells 20 may be bonded together, for example, the second walls 2112 of two adjacent battery cells 20 may be bonded together with a structural adhesive, but the embodiments of this application are not limited thereto. Bonding and fixing adjacent battery cells 20 in each row of battery cells 20 can further enhance the fixing effect of the battery cells 20.

[0311] Using the battery cells 20 and heat conductive members 3a shown in Figures 10 to 13, with 2 to 20 battery cells in a single row, a safety test of the battery 10 was conducted based on GB38031-2020. The test results are shown in Tables 4 to 7. As can be seen from these results, the battery 100 of the embodiment of the present application can meet the safety performance requirements.

[0312] [Table 4]

[0313] [Table 5]

[0314] [Table 6]

[0315] [Table 7]

[0316] In some embodiments, as shown in Figures 15 and 35, in the third direction, the dimension H1 of the partition plate 33 and the dimension H2 of the first wall 201 satisfy 0.1 ≤ H1 / H2 ≤ 2, the third direction is perpendicular to the second direction, and the third direction is parallel to the first wall. This maximizes the space utilization rate inside the battery 100, thereby improving the energy density of the battery 100.

[0317] In the third direction, the dimension H1 of the partition plate 33 may be the height of the partition plate 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.

[0318] When H1 / H2 < 0.1, the heat exchange area between the battery cell 20 and the partition plate is small, making it difficult to immediately cool or heat the battery cell 20 and thus difficult to meet the thermal management needs of the battery.

[0319] If H1 / H2 > 2, the thermal management needs of battery 100 are met, but in this case the partition plate 33 occupies a lot of space, wasting space utilization in the third direction and making it difficult to guarantee the requirements for the energy density of battery 100.

[0320] Selectively, H1 / H2 may be 0.1, 0.4, 0.6, 0.9, 1.2, 1.5, 1.8, or 2, etc.

[0321] In some examples, the partition plate 33 is a thermal management member 3b used to regulate the temperature of the battery cell 20, and the height of the thermal management member 3b in the third direction is H1.

[0322] Selectively, the thermal management member 3b may be a water-cooled plate and is used to cool the battery cell 20 during the rapid charging process or to heat the battery cell 20 when the temperature is too low.

[0323] Selectively, the thermal management member 3b may be made of a material with high thermal conductivity, such as a metal material like aluminum.

[0324] In some embodiments, the dimension H1 of the partition plate 33 and the dimension H2 of the first wall 201 further satisfy the condition 0.3 ≤ H1 / H2 ≤ 1.3. This ensures that the temperature of the battery cell 20 does not exceed 55°C during the rapid charging process.

[0325] Selectively, H1 / H2 may be 0.3, 0.5, 0.8, 1.0, 1.1, or 1.3, etc.

[0326] Selectively, in one embodiment of the present invention, the heat exchange area between the first wall 201 and the partition plate is S, and the relationship between the capacity Q of the battery cell 20 and the heat exchange area S is 0.03 Ah / cm². 2 ≤Q / S ≤ 6.66Ah / cm 2 It satisfies the condition.

[0327] The heat exchange area S may also be the contact area between the first wall 201 and the partition plate 33. S is The equation S = H1 * L is satisfied, where L is the dimension along the second direction y of each battery cell 20.

[0328] If Q / S < 0.03 Ah / cm2, the heat exchange area S is sufficiently large and the requirements for thermal management of the battery are met. However, in this case, the space occupied by the partition plate 33 becomes too large, making it difficult to meet the energy density requirements of the battery 100.

[0329] When Q / S > 6.66 Ah / cm2, the heat exchange area S is small, making it impossible to immediately dissipate the heat from the battery cell 20 through the partition plate 33, and thus the battery cell 20 cannot be immediately and rapidly cooled, making it difficult to meet the thermal management needs.

[0330] 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 an appropriate range during the battery charging process, especially during rapid charging. Furthermore, when the capacity Q of the battery cell is constant, the thermal management needs of the battery can be flexibly met by adjusting the heat exchange area S.

[0331] In possible implementations, the dimension H1 of the partition plate 33 is 1.5 cm to 30 cm. This ensures that the temperature of the battery cell 20 does not exceed 55°C during the rapid charging process of the battery.

[0332] A battery charging test was conducted, and the test results are shown in Table 8-1.

[0333] [Table 8]

[0334] In some embodiments, the heat conduction member 3a is used to house a heat exchange medium, the heat conduction member 3a is installed facing the first wall 201 of the battery cell 20, and the heat conduction member 3a and the first wall 201 of the battery cell 20 are connected by heat conduction, and the heat exchange medium regulates the temperature of the battery cell 20 by exchanging heat with the battery cell 20 via the heat conduction member 3a.

[0335] Furthermore, a cavity 30a is provided within the heat conduction member 3a, and the cavity 30a is used to house a heat exchange medium and regulate the temperature of the battery cell 20. The cavity 30a is used, for example, when the thickness of the conduction member 3a is large, to ensure the strength of the heat conduction member 3a while simultaneously reducing its weight. In addition, the cavity 30a allows the heat conduction member 3a to have a large compression space in a direction perpendicular to the first wall 201 (for example, the first direction x), thereby providing the battery cell 20 with a large expansion space.

[0336] The heat exchange medium may be a liquid or a gas, and temperature regulation refers to heating or cooling one or more battery cells 20. When cooling the battery cells 20, the cavity 30a can contain a cooling medium for regulating the temperature of one or more battery cells 20. In this case, the heat exchange medium may also be called a cooling medium or cooling fluid, and more specifically, a cooling liquid or cooling gas. The heat exchange medium may also be used for heating, and the embodiments of this application are not limited thereto. Selectively, the heat exchange medium may circulate to achieve a better temperature control effect. Selectively, the fluid may be water, a mixture of water and ethylene glycol, a heat transfer oil, a refrigerant, or air. Selectively, the cooling medium has a high specific heat capacity to absorb more heat, and at the same time, the boiling point of the cooling medium is low, so that when the battery cells 20 experience thermal runaway, it can rapidly boil and vaporize to absorb heat.

[0337] In some embodiments, as shown in Figures 12 and 32, a cavity 30a is installed inside the partition plate 33.

[0338] As a result, the partition plate 33 on which the cavity structure is installed has deformation absorption capability and can absorb the amount of expansion deformation of the battery cell 20, thereby improving the performance of the battery 100. In other words, the cavity 30a allows the partition plate 33 to have a large compression space in the first direction x, thereby providing the battery cell 20 with a large expansion space.

[0339] Furthermore, the cavity 30a is used, for example, when the thickness of the partition plate 33 is large, to ensure the strength of the partition plate 33 while simultaneously reducing the weight of the partition plate.

[0340] Selectively, the cavity 30a may be used to house a heat exchange medium for regulating the temperature of the battery cell 20, thereby easily adjusting the temperature of the battery cell 20 to an appropriate range at any time, improving the stability and safety of the battery cell 20. As can be seen from this, in this case the cavity 30a may also be called a heat exchange cavity, and the cavity 30a corresponds to one or more flow channels 30c for housing the heat exchange medium.

[0341] The fluid referred to herein may be any liquid, such as water, whose temperature can be controlled and which does not chemically react with the material of cavity 30a; however, this invention is not limited to such liquids.

[0342] In some embodiments, as shown in Figures 12 and 32, in the first direction x, the dimension of the cavity 30a is W, the capacity Q of the battery cell 20 and the dimension W of the cavity 30a satisfy 1.0 Ah / mm ≤ Q / W ≤ 400 Ah / mm, the first direction x is perpendicular to the first wall 201, thereby effectively utilizing the partition plate 33 to prevent heat from diffusing between the battery cells 20. By rapidly cooling a battery cell 20 that is too hot and lowering its temperature, the heat from that battery cell 20 is diffused and transferred to the adjacent battery cell 20, preventing the adjacent battery cell 20 from becoming too hot.

[0343] When Q / W > 400Ah / mm, the dimension W of the cavity 30a is small, and the volume of fluid that can be contained or flowed within the cavity 30a is small, making it impossible to immediately cool the battery cell 20. Therefore, when the temperature of one battery cell 20 becomes too high, it cannot be immediately cooled, and the heat from that battery cell 20 diffuses to the adjacent battery cell 20, causing the temperature of the adjacent battery cell 20 to become too high, resulting in a malfunction and affecting the overall performance of the battery 10.

[0344] When Q / W < 1.0 Ah / mm, the dimension W of the cavity 30a is large, the volume that can be accommodated or flowed within the cavity 30a is large, and the battery cell 20 can be sufficiently cooled. However, the large dimension of the cavity 30a results in a large space occupied by the partition plate 33, which cannot guarantee the energy density of the battery 100, and at the same time, the partition plate 33, which is too large in volume, leads to increased costs.

[0345] The cavity 30a may be formed from a pair of heat conduction plates 333 in the partition plate 33, and the dimension W of the cavity 30a along the first direction x may be the distance along the first direction x between the inner walls of the two heat conduction plates 333. The larger the dimension W of the cavity 30a, the larger the volume of the cavity 30a, and the larger the volume of fluid that can be contained or flowed within the cavity 30a, thereby accelerating heat transfer between the battery cell 20 and the partition plate 33. For example, if the partition plate 33 is a water-cooled plate, the larger the dimension W of the cavity 30a, the faster the heat from the battery cell 20 is released, thereby accelerating the cooling of the battery cell 20 and preventing the diffusion of heat from the battery cell 20 to adjacent battery cells 20. Selectively, the fluid may circulate to achieve a better temperature control effect. Selectively, the fluid may be water, a mixture of water and ethylene glycol, a refrigerant, or air, etc.

[0346] Figure 36 is a schematic diagram of a structure in which a battery cell and a thermal management member are connected according to one embodiment of the present invention. Figure 37 is a cross-sectional view along the AA direction in Figure 36, and Figure 38 is an enlarged schematic view of region G in Figure 37. In one embodiment of the present invention, referring to Figures 36 to 38, the dimension T3 of the battery cell 20 along the first direction x and the dimension H of the thermal management member 3b along the third direction satisfy 0.03 ≤ T3 / H ≤ 5.5, and the third direction is perpendicular to the first and second directions.

[0347] The dimension T3 of the battery cell 20 along the first direction x may also be the thickness T3 of the battery cell 20, and the thickness T3 of the battery cell 20 is related to the capacity Q of the battery cell 20, with the larger the thickness T3, the larger the capacity Q.

[0348] The dimension H1 of the partition plate 33 along the third direction may also be the height H of the thermal management member 3b along the third direction. The larger H is, the larger the volume of the thermal management member 3b, the larger the occupied space, and at the same time, the higher the thermal management capacity. For example, if the thermal management member 3b is a water-cooled plate, the larger H is, the higher the cooling capacity for the battery cells 20, and the more effectively the diffusion of heat from the battery cells 20 to adjacent battery cells 20 can be prevented.

[0349] When T3 / H < 0.03, the dimension H along the third direction of the thermal management member 3b is large, which can adequately satisfy the requirement of preventing heat diffusion from the battery cell 20. However, it becomes difficult to meet the energy density requirements of the battery 10, and at the same time, the large volume of the thermal management member 3b leads to a reduction in production costs.

[0350] When T3 / H > 5.5, the thermal management component 3b has difficulty meeting the thermal management needs of the battery cell 20, and cannot immediately dissipate the heat from the battery cell 20. This heat then diffuses to adjacent battery cells 20, causing temperature anomalies in other battery cells 20 and affecting the performance of the battery 10.

[0351] In some embodiments, the dimension H1 of the partition plate 33 along the third direction is 15 mm to 300 mm. This allows the partition plate 33 to meet the needs for both strength and thermal management performance.

[0352] In some embodiments, the dimension W of the cavity 30a is between 0.8 mm and 50 mm. This allows for a balance between the needs for strength and thermal management performance.

[0353] A thermal diffusion test of battery 100 was conducted using a system combining two rows of battery cells 20 and two partition plates 33, based on GB38031-2020. The test results are shown in Table 8-1.

[0354] [Table 9]

[0355] In some embodiments, as shown in Figures 32, 33, and 38, the partition plate 33 further includes a pair of heat conduction plates 333 that are positioned opposite each other along a first direction, the cavity 30a is positioned between the pair of heat conduction plates 333, and the first direction is perpendicular to the first wall 201.

[0356] For example, each heat conduction plate 333 extends along a second direction, and two heat conduction plates 333 face each other along a first direction, thereby forming a cavity 30a between the two heat conduction plates 333, the cavity 30a may serve as a flow path for a heat exchange medium, and the partition plate 33 is formed as a heat conduction member 3a or a heat management member 3b.

[0357] In some embodiments, as shown in Figure 32, the dimension D of the heat conductive plate 333 in the first direction x is 0.1 mm to 5 mm.

[0358] If the dimension D of the heat conduction plate 333 in the first direction is too small, and the space inside the partition plate 33 remains constant, the cavity 30a will occupy most of the space inside the partition plate 33. In this case, the partition plate 33 will have low rigidity and will not be able to effectively improve the structural strength of the battery 10. If the dimension D of the heat conduction plate 333 in the first direction is too large, the cavity 30a inside the partition plate 33 will be very small, and it will not be able to contain much fluid and will not be able to effectively regulate the temperature of the battery cell 20. Therefore, the value of D is set to 0.1 mm to 5 mm.

[0359] Selectively, the dimensions D of the pair of heat conduction plates 333 in the first direction of the partition plate 333 may be the same or different.

[0360] Selectively, the two heat conduction plates 333 may be made of a material with high thermal conductivity, such as a metal material like aluminum.

[0361] In some embodiments, as shown in Figures 33 and 38, the partition plate 33 further includes reinforcing ribs 334, which are provided between a pair of heat conduction plates 33 to enhance the structural strength of the partition plate 33.

[0362] Selectively, the number of reinforcing ribs 334 is one, which allows for the formation of one or more cavities 30a between a pair of heat conduction plates 333.

[0363] If there are multiple cavities 30a, the different cavities 30a may be independent of each other or may be connected via an adapter.

[0364] When the reinforcing rib 334 is connected to only one of the pair of heat conduction plates 333, the reinforcing rib 334 is a cantilever with one end connected to the heat conduction plate 333, in which case the cavity 30a can correspond to one flow path 30c, and when the reinforcing rib 334 is connected to each of the pair of heat conduction plates 333, the cavity 30a can correspond to multiple flow paths 30c. The number of reinforcing ribs 334 can be specifically determined according to requirements, and the embodiments of this application are not limited thereto.

[0365] In some embodiments, as shown in Figures 33 and 45, the reinforcing ribs 334 are connected to at least one of the pair of heat conduction plates 333, thereby further ensuring the structural strength of the partition plate 333.

[0366] Selectively, as shown in Figure 33, the reinforcing rib 334 may be installed on only one heat conduction plate 333, or the reinforcing rib 334 may be installed between a pair of heat conduction plates 333 and connected to the pair of heat conduction plates 333.

[0367] Selectively, as shown in Figure 33, when the reinforcing rib 334 is connected to a pair of heat conduction plates 333, the angle between the reinforcing rib 334 and the heat conduction plate 333 may be acute, thereby providing a larger expansion space for the battery cell 20. Alternatively, as shown in Figure 33, when the reinforcing rib 334 is connected to a single heat conduction plate 333, the angle between the reinforcing rib 334 and the heat conduction plate 333 may be right-angled, thereby allowing the partition plate to withstand greater pressure.

[0368] Selectively, the reinforcing ribs 334 may have irregular shapes such as C-shape, corrugated, or cross-shaped, which can effectively absorb expansion and also add turbulence to enhance the heat exchange effect.

[0369] In some embodiments, as shown in Figure 45, the reinforcing rib 334 includes a first reinforcing rib 3341, to which a pair of heat conduction plates 333 are connected at each end, and the first reinforcing rib 3341 is used to support the pair of heat conduction plates 333. When the partition plate 333 deforms to absorb the expansion force of the battery cell 20, the first reinforcing rib 3341 can deform in response to the pair of heat conduction plates 33 moving toward each other, at least partially along the first direction x.

[0370] When the first reinforcing rib 3341 is installed at an angle with respect to the first direction x, the angle between the first reinforcing rib 3341 and one of the pair of heat conduction plates 333 is less than 90°, which improves the flexibility of the first reinforcing rib 3341, allowing it to deform better to meet the need to absorb the expansion force of the partition plate 33, and avoids the risk of the deformation space being smaller due to the straight shape, making it prone to rupture and failure.

[0371] Selectively, the first reinforcing rib 3341 may be one or more, and the multiple first reinforcing ribs 3341 may be spaced apart along the third direction, and the spacing between two adjacent first reinforcing ribs 3341 may be the same or different.

[0372] Selectively, the material of the first reinforcing rib 3341 may be fabricated using the structure of the reinforcing rib, ensuring support while simultaneously achieving a lightweight design for the partition plate 333 and a lightweight design for the entire battery 100.

[0373] Selectively, the first reinforcing rib 3341 is connected to a pair of heat conduction plates 333, and the first reinforcing rib 3341 extends along the second direction y, thereby increasing the connection area between the first reinforcing rib 3341 and each heat conduction plate 333, and improving the support strength.

[0374] Selectively, the first reinforcing rib 3341 exhibits a plate-like structure, which can be deformed more effectively, satisfies the requirement that the partition plate absorb the expansion force of the battery cell 20, is advantageous for production and processing, and improves manufacturing efficiency.

[0375] In some embodiments, as shown in Figure 45, the range of the angle between the first reinforcing rib 3341 and the first direction x is 30° to 60°, and the range of the angle between the first reinforcing rib 3341 and one of the pair of heat conductive plates 333 is 30° to 60°, which not only better satisfies the support requirements but also makes it easier to deform and less likely to break.

[0376] If there are multiple first reinforcing ribs 3341, the inclination directions of two adjacent first reinforcing ribs 3341 may be the same or different.

[0377] In some embodiments, as shown in Figure 45, the reinforcing rib 334 further includes a second reinforcing rib 3342, where one end of the second reinforcing rib 3341 is connected to one of a pair of heat conduction plates 333, and the other end of the second reinforcing rib 3342 is spaced apart from the other of the pair of heat conduction 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 conduction plates 333.

[0378] Therefore, by installing the second reinforcing rib 3342, not only is a better support effect achieved in conjunction with the first reinforcing rib 3341, but the deformation range of the partition plate 33 can be controlled. When the second reinforcing rib 3342 of one of the pair of heat conduction plates 333 comes into contact with the other, the deformation of the partition plate 33 can be further restricted, preventing the flow path 30c corresponding to the cavity 30a from becoming blocked, thereby ensuring the effectiveness of the flow path 30c and the effectiveness of the partition plate 33.

[0379] Selectively, the pair of heat conduction plates 333 are a first heat conduction plate 3331 and a second heat conduction plate 3332, and the second reinforcing rib 3342 may be installed on the first heat conduction plate 3331 or on the second heat conduction plate 3332, and exemplary, the second reinforcing rib 3342 is installed on both the first heat conduction plate 3331 and the second heat conduction plate 3332.

[0380] In some embodiments, as shown in Figure 45, a second reinforcing rib 3342 is installed between two adjacent first reinforcing ribs 3341 in the third direction. Selectively, one of the two adjacent second reinforcing ribs 3342 is installed on the first heat conduction plate 3331 and the other on the second heat conduction plate 3332, thereby ensuring that the forces acting on the first heat conduction plate 3331 and the second heat conduction plate 3332 are uniform, while simultaneously preventing them from bearing excessive weight.

[0381] In some embodiments, as shown in Figure 45, the second reinforcing rib 3342 extends along the first direction x and protrudes from one of the pair of heat conductive plates 333, simplifying the structure of the second reinforcing rib 3342 and making it easier to process.

[0382] Selectively, the second reinforcing rib 3342 has a polygonal prism shape, thereby having a sufficient cross-sectional area. When the partition plate 33 absorbs the expansion force of the battery cell 20 and deforms until the second reinforcing rib 3342, which is installed on one of the pair of heat conduction plates 333, comes into contact with the other, the second reinforcing rib 3342 can have a sufficient contact area, further improving its support capacity and ensuring the effectiveness of the partition plate 33 by avoiding the second reinforcing rib 3342 breaking and losing its effectiveness, causing the two heat conduction plates 333 to come into contact.

[0383] In some embodiments, as shown in Figure 45, the first reinforcing rib 3341 and the second reinforcing rib 3342 are spaced apart, thereby ensuring that the forces acting on the two heat conduction plates 333 are uniform.

[0384] In some embodiments, the first reinforcing ribs 3341 and the second reinforcing ribs 3342 are arranged alternately along a third direction (for example, the height direction of the housing 10). For example, two adjacent first reinforcing ribs 3341 and second reinforcing ribs 3342 may be alternately placed on the first heat conduction plate 3331 and the second heat conduction plate 3332. Of course, the position of the second reinforcing ribs 3342 may be set according to certain arrangement rules.

[0385] For example, in the third direction, one of two adjacent second reinforcing ribs 3342 is installed on the first heat conduction plate 3331 and the other on the second heat conduction plate 3332, thereby ensuring that the forces acting on the first heat conduction plate 3331 and the second heat conduction plate 3332 are uniform, while simultaneously preventing them from bearing excessive weight.

[0386] By installing in this manner, not only is the uniformity of the support action of the two heat conductive plates 333 guaranteed, but blockage phenomena can be prevented in each part of the flow path 30c corresponding to the cavity 30a along the second direction y, thereby ensuring the effectiveness of the flow path 30c.

[0387] In some embodiments, as shown in Figures 32 and 45, in the first direction x, the thickness D of the heat conduction plate 333 and the dimension W of the cavity 30a of the partition plate 33 satisfy 0.01 ≤ D / W ≤ 25, thereby achieving a balance between the needs for strength and thermal management performance.

[0388] Specifically, if the dimensions W of the cavity 30a are large, the fluid flow resistance within the cavity 30a decreases, improving the heat exchange rate per unit time of the partition plate 33. If the thickness D of the heat conduction plate 333 is large, the strength of the partition plate 33 increases. If D / W is less than 0.01, the dimensions W of the cavity 30a are sufficiently large, but the occupied space is too large, or the thickness D of the heat conduction plate 333 becomes too thin in a given space of the partition plate 33, potentially resulting in insufficient strength. For example, this may not meet the requirements for resistance to vibration and shock of the battery 20, and may even lead to the partition plate 33 being crushed during initial assembly. If D / W ≥ 25, the thickness D of the heat conduction plate 333 is sufficiently thick, but the dimension W of the cavity 30a may become too small within the given space of the partition plate 33. This increases the fluid flow resistance within the cavity 30a, degrading heat exchange performance or causing the cavity 30a to become blocked during use. At the same time, if the wall thickness of the heat conduction plate 333 is too large, the force generated by the expansion of the battery cell 20 does not meet the requirement of crushing the partition plate 33 to accommodate the expansion space required for the battery cell 20. In other words, the partition plate 33 cannot immediately release the necessary expansion space for the battery cell 20, accelerating the decrease in the capacity of the battery cell 20. Therefore, if the thickness D of the heat conduction plate 333 and the dimension W of the cavity 30a satisfy 0.01 ≤ D / W ≤ 25, the needs for strength and thermal management performance can be reconciled, and the performance of the battery 100 is guaranteed.

[0389] Selectively, when 0.01 ≤ D / W ≤ 0.1, the fluid can be a solid-liquid phase change material or a liquid working medium, and the outer layer of the partition plate 33 can be made of a film-like material with a skeletal structure filled inside for reinforcement, which can be used when the strength requirement is low or the compression performance requirement of the partition plate 33 is high.

[0390] Selectively, if the range is 0.1 ≤ D / W ≤ 1, means of convective heat exchange of a fluid working medium or gas-liquid phase change cooling may be used inside the partition plate 33, and the heat exchange performance of the partition plate 33 is guaranteed by using a liquid working medium as the heat exchange medium.

[0391] Selectively, if 1 ≤ D / W ≤ 25, a means of gas-liquid phase change cooling may be used for the partition plate 33. By adjusting the internal gap, the overall pressure is increased, ensuring that the working medium exists in liquid form inside the partition plate 33. This prevents the phenomenon of two states, gas and liquid, coexisting due to pressure loss, and provides heat exchange performance. At the same time, the thickness D of the heat conduction plate 33 is sufficiently thick to prevent the partition plate 33 from rupturing due to an increase in the vaporization pressure of the internal working medium during heating.

[0392] Selectively, the thickness D of the heat conduction plate 333 and the dimension W of the cavity 30a satisfy 0.05 ≤ D / W ≤ 15, and further satisfy 0.1 ≤ D / W ≤ 1, thereby better balancing space, strength, and thermal management and further improving the performance of the battery 100.

[0393] Selectively, the dimension T1 of the partition plate 33 in the first direction x is between 0.3 mm and 100 mm.

[0394] T1 is the total thickness of the thermal management component partition plate 33, i.e., T1 = 2*D + W. If T1 is too large, it will occupy an excessive amount of space, and if T1 is too small, the strength will decrease too much or the cavity 30a will become too narrow, affecting the thermal management performance. Therefore, when the total thickness T1 of the partition plate 33 is between 0.3 mm and 100 mm, space, strength, and thermal management can be balanced, and the performance of the battery 100 can be guaranteed.

[0395] Selectively, the thickness D of the thermal conductive plate 333 is between 0.1 mm and 25 mm.

[0396] If the thickness D of the heat conductive plate 333 is too large, it occupies an excessive amount of space, and the partition plate 33 cannot immediately release the necessary expansion space for the battery cell 20. If D is too small, the strength becomes too low. Therefore, when the thickness D of the heat conductive plate 333 is between 0.1 mm and 25 mm, the requirements for space, strength, and expansion of the battery cell 20 can be balanced, and the performance of the battery 100 is guaranteed.

[0397] Selectively, the dimension W of the cavity 30a in the first direction is between 0.1 mm and 50 mm.

[0398] Specifically, the dimension W of the cavity 30a must be at least larger than the particle size of any foreign matter that may appear inside in order to avoid blockage during use. If the dimension W of the cavity 30a is too small, the fluid flow resistance within the cavity 30a will increase, and the heat exchange performance will deteriorate. Therefore, the dimension W of the cavity 30a should be 0.1 mm or larger. If the dimension W of the cavity 30a is too large, it will occupy excessive space or lack sufficient strength. Thus, when the dimension W of the cavity 30a is between 0.1 mm and 50 mm, it is possible to balance space, strength, and thermal management performance, and the performance of the battery 100 can be guaranteed.

[0399] Selectively, the dimension T1 of the partition plate 33 in the first direction x and the area S3 of the first wall 201 are 0.03 mm². -1 ≤T1 / S3*1000 ≤2mm -1 It satisfies the condition.

[0400] When T1 and S3 satisfy the above conditions, the requirements for heat exchange performance and dimensional space of the battery cell 20 can be met. Specifically, if the area S3 of the first wall 201 of the battery cell 20 is large, the cooling area is large, and the heat transfer resistance from the partition plate 33 to the surface of the battery cell 20 can be reduced. If the total thickness T1 of the partition plate 33 is large, the strength can be improved. T1 / S3 * 1000 = 0.03 mm -1If T1 / S3*1000 is less than 2mm, the area S3 of the first wall 201 of the battery cell 20 is sufficiently large, but the partition plate 33 is too thin, lacking strength, and the partition plate 33 may break or crack during use. -1 If the ratio is larger, the partition plate 33 may be sufficiently thick, but the area S3 of the first wall 201 of the battery cell 20 may be too small, resulting in insufficient cooling surface for the partition plate 33 to provide to the battery cell 20, and thus there is a risk that the heat dissipation requirements of the battery cell 20 will not be met. Therefore, the total thickness T1 of the partition plate 33 and the area S3 of the first wall 201 should be 0.03 mm -1 ≤T1 / S*1000 ≤2mm -1 If the requirements are met, the strength and thermal management performance are essential. The matter It can be used simultaneously and guarantees 100% battery performance.

[0401] Selectively, the partition plate 33 further includes reinforcing ribs 334, which are provided between a pair of heat conductive plates 333, and the thickness X of the reinforcing ribs 334 is (-0.0005*F+0.4738) mm or more, where F is the tensile strength of the material of the reinforcing ribs 334, in units of MPa. In other words, the thickness X of the reinforcing ribs 334 is at least (-0.0005*F+0.4738) mm.

[0402] The thickness X of the reinforcing rib 334 is related to the tensile strength of the material. Based on the above relationship, in order to satisfy the force requirements of the partition plate 33, a material with higher strength may be selected, and the thickness X of the internal reinforcing rib 334 may be made thinner, thereby saving space and improving energy density. Selectively, the thickness X of the reinforcing rib 334 may be 0.2 mm to 1 mm.

[0403] Using the battery cell 20 and partition plate 33 shown in Figure 45, simulation tests were conducted on the heating rate and the deformation force of the partition plate 33, and the test results are shown in Table 9. In Table 9, L is the dimension of the battery cell 20 in the second direction y, T3 is the dimension of the battery cell 20 in the first direction x, and H2 is the dimension of the first wall 201 of the battery cell 20 in the third direction, where the third direction is perpendicular to the first direction x and the second direction y.

[0404] [Table 10] [Table 11]

[0405] In some embodiments, as shown in Figures 47, 48, 50, and 51, the partition plate 33 is provided with a medium inlet 3412 and a medium outlet 3422, and the cavity 30a communicates with the medium inlet 3412 and the medium outlet 3422, thereby allowing the cavity 30a to accommodate a heat exchange medium for regulating the temperature of the battery cell 20. Inside the partition plate 33, there is a cavity 30b that is blocked from both the medium inlet 3412 and the medium outlet 3422, and the cavity 30b can prevent the inflow of the heat exchange medium, thereby regulating the temperature of the battery cell 20 and reducing the weight of the partition plate 33. This enables weight reduction of the partition plate 33 and mitigates the phenomenon of the heat exchange medium flowing into the cavity 30b during use, which increases the weight of the partition plate 33. Thus, the weight of the battery 100 having such a partition plate 33 can be effectively reduced, which is advantageous for improving the energy density of the battery 100 and improving the performance of the battery 100.

[0406] For example, the medium inlet 3412 and medium outlet 3422 are installed at opposite ends of the partition plate 33, and both the cavity 30a and the cavity 30b are installed inside the partition plate 33. The cavity 30a communicates with the medium inlet 3412 and the medium outlet 3422, that is, both ends of the cavity 30a communicate with the medium inlet 3412 and the medium outlet 3422, respectively, thereby allowing the fluid medium to flow into or out of the cavity 30a. The cavity 30b is blocked from both the medium inlet 3412 and the medium outlet 3422, that is, no communication relationship is formed between the cavity 30b and the medium inlet 3412 and the medium outlet 3422, and the fluid medium cannot flow into the cavity 30b.

[0407] The cavity 30b installed inside the partition plate 33 may be one or multiple, and similarly, the cavity 30a installed inside the partition plate 33 may be one or multiple. If there are multiple cavities 30a, each cavity 30a is in communication with the medium inlet 3412 and the medium outlet 3422, that is, both ends of the multiple cavities 30a are in communication with each other, the medium inlet 3412 and the medium outlet 3422. Exemplarily, in the embodiment of the present application, both the cavity 30a and cavity 30b installed inside the partition plate 33 are multiple.

[0408] In some embodiments, referring to Figures 47 and 48, the partition plate 33 includes a main plate 331 (also referred to as the main body), a first bath member 341, and a second bath member 342. A cavity 30a and a void 30b are installed in the main plate 331. Along the length direction of the main plate 331 (i.e., the second direction y), the first bath member 341 and the second bath member 342 are installed at opposite ends of the main plate 331, and a medium inlet 3412 and a medium outlet 3422 are installed in the first bath member 341 and the second bath member 342, respectively.

[0409] Both cavities 30a and 30b are installed inside the main plate 331. Exemplarily, in Figure 48, both cavities 30a and 30b extend along the length of the main plate 331, and both ends of cavity 30a pass through both ends of the main plate 331, thereby enabling cavity 30a to communicate with the medium inlet 3412 of the first bus member 341 and the medium outlet 3422 of the second bus member 342.

[0410] The main body plate 331, the first bus member 341, and the second bus member 342 may be an integrated structure or separate structures. If the main body plate 331, the first bus member 341, and the second bus member 342 are an integrated structure, they may be manufactured by casting or injection molding processes. If the main body plate 3315, the first bus member 341, and the second bus member 342 are separate structures, the first bus member 341 and the second bus member 342 may be connected to both ends of the main body plate 331 using methods such as bolting, fastening, or bonding.

[0411] In some embodiments, as shown in Figures 48 to 51, a passage 3151 is installed inside the main plate 331, and the passage 3151 penetrates both ends of the main plate 331 in the longitudinal direction. The partition plate 33 further includes a closing member 318, which is connected to the main plate 331, and the closing member 318 closes both ends of the passage 3151, forming a cavity 30b.

[0412] Along the length of the main plate 331, closing members 318 are installed at both ends of the passage 3151 that penetrate the main plate 331. By closing both ends of the passage 3151 with the closing members 318, a sealed cavity 30b can be formed, thereby ensuring that both the cavity 30b and the medium inlet 3412 and medium outlet 3422 are blocked.

[0413] For example, the closing member 318 may be a metal sheet, a rubber stopper, or a silica gel stopper. In the actual manufacturing process, different closing members 318 can be used depending on the size of the passage 3151. For example, if the passage 3151 is large, a metal sheet may be welded to one end of the main plate 331 to close the passage 3151, or a rubber stopper or silicone stopper may be used to close the passage 3151. If the passage 3151 is small, welding a metal piece is difficult, so a rubber stopper or silicone stopper can be locked inside the passage 3151 to achieve the function of closing the passage 3151.

[0414] In some embodiments, as shown in Figures 48 to 51, the blocking member 318 is detachably connected to the main plate 331. By connecting the blocking member 318 to the main plate 331 in a detachable manner, the blocking member 318 can be quickly removed and replaced, on the one hand, different passages 3151 can be blocked according to actual needs during use, thus meeting different needs in use, and on the other hand, the blocking member 318 can be maintained and replaced, which is advantageous in extending the service life of the partition plate 33.

[0415] For example, the closing member 318 is attached to one end of the passage 3151 to close the passage 3151. Of course, in other embodiments, the closing member 318 may be detachably connected to the main plate 331 using methods such as bolting or fastening.

[0416] In Figures 48 to 51, the cavity 30b is a sealed structure formed by the closing member 318 closing the passage 3151 inside the main plate 331. In other embodiments, as shown in Figure 50, the cavity 30b may be a structure formed by integrally molding the main plate 331. In other words, the cavity 30b is a structure in which the main plate 331 has a cavity inside by a process such as casting or pressing, meaning that the closing member 318 and the main plate 331 are an integral structure.

[0417] A passage 3151 is formed inside the main plate 331, passing through both ends of the main plate 331 in the longitudinal direction of the main plate 331, and a closing member 318 is installed on the main plate 331. The closing member 318 closes both ends of the passage 3151, thereby forming a cavity 30b that is blocked from both the medium inlet 3412 and the medium outlet 3422. The structure is simple, easy to manufacture and process, and different passages 3151 can be closed according to actual needs, thereby expanding the range of application of the partition plate 33.

[0418] In some embodiments, a first chamber communicating with a medium inlet 3412 is formed inside the first bus member 341, a second chamber communicating with a medium outlet 3422 is formed inside the second bus member 342, and the flow path 30c penetrates both ends of the main body plate 331 in the longitudinal direction and communicates with the first and second chambers.

[0419] When a first chamber communicating with a medium inlet 3412 is formed inside the first bus member 341, that is, when a first chamber is formed inside the first bus member 341 and the medium inlet 3412 penetrates the chamber wall of the first chamber, and the first bus member 341 is attached to one end of the main body plate 331, the flow path 30c penetrating one end of the main body plate 331 can communicate with the first chamber inside the first bus member 341, thereby enabling communication between the multiple flow paths 30c and the medium inlet 3412.

[0420] Similarly, when a second chamber communicating with a medium outlet 3422 is formed inside the second bus member 342, that is, when a second chamber is formed inside the second bus member 342 and the medium outlet 3422 penetrates the chamber wall of the second chamber, and the second bus member 342 is attached to one end of the main body plate 331, the flow path 30c penetrating one end of the main body plate 331 can communicate with the second chamber inside the second bus member 342, thereby enabling all of the multiple flow paths 30c to communicate with each other and with the second chamber of the second bus member 342, and enabling all of the multiple flow paths 30c to communicate with the medium outlet 3422.

[0421] Furthermore, the cavity 30b does not communicate with the first chamber of the first bus member 341 or the second chamber of the second bus member 342, thereby blocking the cavity 30b from both the medium inlet 3412 and the medium outlet 3422.

[0422] The first bus member 341 is equipped with a first chamber that communicates with the flow path 30c, and the second bus member 342 is equipped with a second chamber that communicates with the medium outlet 3422. The flow path 30c penetrates both ends of the main plate 331 and can communicate with both the first and second chambers, enabling communication between the flow path 30c and both the medium inlet 3412 and the medium outlet 3422. This allows for the simultaneous injection of fluid medium into multiple flow paths 30c via the medium inlet 3412 and the medium outlet 3422 during use, thereby improving usage efficiency.

[0423] In some embodiments, as shown in Figures 47 and 48, both the cavity 30b and the cavity 30a extend along the longitudinal direction of the main plate 331 and are arranged along the width direction (i.e., the third direction z) of the main plate 331.

[0424] A cavity 30a and multiple cavities 30b are installed in the partition plate 33, the cavity 30a corresponds to multiple flow paths 30c, both the cavities 30b and flow paths 30c extend along the length direction of the main plate 331, and both the multiple cavities 30b and multiple flow paths 30c are arranged along the width direction of the main plate 331. There may be multiple arrangement methods for the multiple cavities 30b and multiple flow paths 30c. For example, the cavities 30b and flow paths 30c may be arranged alternately, the multiple cavities 30b may be located on one side of the multiple flow paths 30c along the width direction of the main plate 331, or the multiple cavities 30b may be installed in the middle of the main plate 331 along the width direction of the main plate 331, with flow paths 30c installed on both sides of the multiple cavities 30b. As an example, in Figure 48, two flow channels 30c are installed in the middle of the main body plate 331 along the width direction of the main body plate 331, three cavities 30b are installed on each side of the two flow channels 30c, and one flow channel 30c is installed at each end of the main body plate 331.

[0425] Both the cavity 30b and the flow path 30c extend along the length direction of the main plate 331 and are arranged along the width direction of the main plate 331, making it easy to process and manufacture the cavity 30b and the flow path 30c, and easy to optimize the arrangement position of the flow path 30c, which helps to improve the ability of the partition plate 33 to regulate the temperature of the battery 100.

[0426] In some embodiments, as shown in Figures 48 and 49, a flow path 30c is installed in the middle of the main body plate 331 along the width direction of the main body plate 331.

[0427] If a flow path 30c is installed in the middle of the main plate 331, and there is only one flow path 30c, the flow path 30c is installed in the middle of the main plate 331. If there are multiple flow paths 30c, at least some of the flow paths 30c are located in the middle of the main plate 331 in the width direction. Exemplarily, in Figures 48 and 49, two flow paths 30c are installed in the middle of the main plate 331 along the width direction of the main plate 1. Of course, in other embodiments, for example, one, three, or four flow paths 30c may be installed in the middle of the main plate 331 along the width direction of the main plate 331.

[0428] The main plate 331 has a flow path 30c installed in the middle in its width direction, which allows for heat exchange to occur in areas where heat is concentrated inside the battery 100, thus improving the thermal management performance of the partition plate 33 relative to the battery 100.

[0429] In some embodiments, refer to Figure 51, which is a cross-sectional view of the main plate 331 of a partition plate 33 according to another embodiment of the present application. Multiple flow channels 30c and multiple cavities 30b are installed in the partition plate 33, and the cavities 30b and flow channels 30c are arranged alternately along the width direction of the main plate 331.

[0430] The cavities 30b and flow channels 30c are arranged alternately, that is, the cavities 30b and flow channels 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 installed between two adjacent flow channels 30c, and a flow channel 30c is installed between two adjacent cavities 30b.

[0431] The cavities 30b and flow channels 30c are arranged alternately along the width direction of the main plate 331. In other words, there are multiple cavities 30b and flow channels 30c, and they are arranged alternately with respect to each other. This ensures that the flow channels 30c are distributed along the width direction of the main plate 331, effectively reducing the phenomenon of the flow channels 30c being concentrated and causing an imbalance in the heat exchange capacity of the partition plate 33, thereby improving the performance of the partition plate 33.

[0432] In some embodiments, as shown in Figure 49, along the thickness direction (i.e., first direction x) of the main body plate 331, the main body plate 331 has two opposing sides 3312, the area of ​​one side 3312 is S5, the total area of ​​the projection of the flow path 30c on the side 3312 is S6, and S6 / S5 ≥ 0.2.

[0433] The area of ​​one side surface 3312 is S5, the total area of ​​the projection of the flow channels 30c on the side surface 3312 is S6, and S6 / S5 ≥ 0.2, meaning that the total area occupied by the multiple flow channels 30c on the side surface 3312 of the main plate 331 is 20% or more.

[0434] By ensuring that the area occupied by the multiple flow channels 30c on the side surface 3312 of the main plate 331 is 20% or more, the phenomenon of low heat exchange capacity due to insufficient area occupied by the flow channels 30c can be reduced, and the heat exchange performance of the partition plate 33 can be guaranteed.

[0435] In some embodiments, as shown in Figures 46 and 47, the cavities 30a of multiple partition plates 33 are connected in series, i.e., the medium inlet 3412 of one partition plate 33 communicates with the medium outlet 3422 of another partition plate 33. Naturally, the flow paths 30c of multiple partition plates 33 may also be connected in parallel, i.e., the medium inlets 3412 of multiple partition plates 33 communicate with each other, and the medium outlets 3422 of multiple partition plates 33 communicate with each other. Multiple partition plates 33 are installed in the battery 100, which is advantageous in improving the thermal management capability of the partition plates 33 for the battery cells 20 and reduces safety risks due to the rise in the internal temperature of the battery 100.

[0436] In some embodiments, as shown in Figures 46 and 47, the media outlet 3422 of one partition plate 33 communicates with the media inlet 3412 of another partition plate 33.

[0437] There may be multiple structures in which the media outlet 3422 of one partition plate 33 communicates with the media inlet 3412 of another partition plate 33. The media outlet 3422 of one partition plate 33 may be connected to the media inlet 3412 of another partition plate 33, or they may be connected via other components, such as connecting pipes, thereby realizing a series connection structure of multiple partition plates 33.

[0438] By connecting the media outlet 3422 of one of the multiple partition plates 33 with the media inlet 3412 of another partition plate 33, a series connection structure of multiple partition plates 33 is realized, making assembly and processing easy, and facilitating the injection of fluid media into the flow paths 30c of the multiple partition plates 33 during use.

[0439] In some embodiments, multiple flow channels 30c are installed in the partition plate 33, and along the flow direction of the fluid medium in the flow channels 30c of the multiple partition plates 33, the number of flow channels 30c of the downstream partition plate 33 is greater than the number of flow channels 30c of the upstream partition plate 33 among two adjacent partition plates 33.

[0440] Here, the direction of fluid flow in the flow channels 30c of the multiple partition plates 33 is aligned with the direction in which the fluid flows through the flow channels 30c of the multiple partition plates 33. Of two adjacent partition plates 33, the number of flow channels 30c of the downstream partition plate 33 is greater than the number of flow channels 30c of the upstream partition plate 33. In other words, in the direction of fluid flow, of two adjacent partition plates 33, the partition plate 33 through which the fluid passes first is the upstream partition plate 33, and the partition plate 33 through which the fluid passes later is the downstream partition plate 33. That is, the fluid flows from the flow channel 30c of the upstream partition plate 33 to the flow channel 30c of the downstream partition plate 33.

[0441] By increasing the number of flow channels 30c in the downstream partition plate 33 to more than the number of flow channels 30c in the upstream partition plate 33, it is advantageous to improve the heat exchange capacity of the downstream partition plate 33. This ensures that the heat exchange capacities of the multiple partition plates 33 are balanced with each other, improving the overall thermal management capability and effectively mitigating the phenomenon of localized temperature rises occurring inside the battery 100.

[0442] In some embodiments, the media inlets 3412 of multiple partition plates 33 are in communication with each other, and the media outlets 3422 of multiple partition plates 33 are in communication with each other.

[0443] Here, the media inlets 3412 of the multiple partition plates 33 may be directly connected, or they may be connected via other components, such as connecting pipes, and the same applies to the media outlets 3422 of the multiple partition plates 33, thereby realizing a parallel connection structure of the multiple partition plates 33.

[0444] By having the medium inlets 3412 of multiple partition plates 33 communicate with each other, and the medium outlets 3422 of multiple partition plates 33 communicate with each other, thereby realizing a parallel connection structure of multiple partition plates 33, it is possible to simultaneously inject the fluid medium into the flow paths 30c of multiple partition plates 33, and on the other hand, it is possible to effectively ensure a balance in the heat exchange capacity of each partition plate 33, thereby effectively mitigating the phenomenon of localized temperature rise occurring inside the battery 100.

[0445] In some embodiments, as shown in Figure 24, a partition member 335 is provided within the cavity 30a, and the partition member 335 is used to partition the cavity 30a and form at least two flow channels 30c, making it easier to control the arrangement of the fluid medium inside the cavity as needed, thereby rationally adjusting the temperature of the battery cell 20.

[0446] For example, multiple flow channels 30c may be arranged sequentially along a third direction, each flow channel 30c extending along a second direction y, and the third direction being perpendicular to the second direction and parallel to the first wall 201.

[0447] Each flow path 30c may be independent of each other or may be in communication with each other. The fluid medium may be contained in only some of the multiple flow paths 30c, or all of the flow paths 30c may contain the fluid medium. Therefore, the partition member 335 partitions the inside of the partition plate 33 to form multiple flow paths 30c, making it easy to control the arrangement of the fluid medium inside the partition plate 33 according to actual needs, thereby rationally adjusting the temperature of the battery cell 20.

[0448] Selectively, the partition member 335 is integrally molded with the partition plate 33, for example, by an integral molding process such as injection or extrusion. The partition member 335 and the partition plate 33 may be installed separately and then connected to the inner wall of the partition plate by methods such as welding, bonding, or fastening.

[0449] Naturally, only one flow path 30c may be formed within the cavity 30a.

[0450] In some embodiments, the partition plate 33 includes a main plate 331, a cavity 30a is installed inside the main plate 331, the cavity 30a may have one or more flow paths 30c, and the insulating layer 32 includes a first insulating layer 32a, at least a portion of the first insulating layer 32a is provided between the main plate 331 and the battery cell 20.

[0451] Furthermore, referring to Figures 20 and 21, the partition plate 33 further includes a confluence pipe 332, the confluence pipe 332 includes a confluence chamber 332a (shown in Figures 26 and 28), the confluence chamber 332a communicates with a plurality of flow paths 30c, the insulating layer 32 includes a second insulating layer 32b, at least a portion of the second insulating layer 32b is installed between the confluence pipe 332 and the battery cell 20, thereby insulating and isolating the battery cell 20 and the confluence pipe 332.

[0452] The phrase "the second insulating layer 32b covers at least a portion of the outer surface of the confluence pipe 332" can be understood as meaning that a portion of the second insulating layer 32b covers at least a portion of the outer surface of the confluence pipe 332, thereby insulating and isolating the battery cell 20 from the confluence pipe 332.

[0453] Here, the two junction pipes 332 at both ends of the partition plate 33 may be a first bus member 341 and a second bus member 342, respectively.

[0454] Only a portion of the second insulating layer 32b may cover at least a portion of the outer surface of the first bus member 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 member 342, or a portion of the second insulating layer 32b may cover at least a portion of the outer surface of the first bus member 341 and a portion of the second insulating layer 32b may cover at least a portion of the outer surface of the second bus member 342.

[0455] If a portion of the second insulating layer 32b covers at least a portion of the surface of the first bus member 341, the portion of the second insulating layer 32b may cover only a portion of the outer surface of the first bus member 341. For example, if a portion of the second insulating layer 32b covers only the outer circumferential surface of the first bus member 341, and the two end faces of the first bus member 341 along the third direction are not covered by the insulating layer 32, the creepage distance between the battery cell 20 and the portion of the first bus member 341 not covered by the insulating layer 32 can be increased compared to the case where the insulating layer 32 covers only the main plate 331, thereby reducing the risk of the battery 100 short-circuiting. Alternatively, a portion of the insulating layer 32 may cover the entire outer surface of the first bus member 341.

[0456] In another embodiment, the insulating layer 32 does not need to cover the outer surface of the first bus member 341. The first bus member 341 extends along the third direction, and the second bus member 342 extends along the third direction.

[0457] If a portion of the second insulating layer 32b covers at least a portion of the surface of the second bus member 342, the portion of the insulating layer 32 may cover only a portion of the outer surface of the second bus member 342. For example, if a portion of the insulating layer 32 covers only the outer circumferential surface of the second bus member 342, and the two end faces of the second bus member 342 along the third direction are not covered by the second insulating layer 32b, the creepage distance between the battery cell 20 and the portion of the second bus member 342 not covered by the insulating layer 32 can be increased compared to the case where the insulating layer 32 covers only the main plate 331, thereby reducing the risk of the battery 100 short-circuiting. Alternatively, a portion of the second insulating layer 32b may cover the entire outer surface of the second bus member 342.

[0458] In another embodiment, as shown in Figures 27 and 29, the insulating layer 32 does not need to cover the outer surface of the second bus member 342.

[0459] Therefore, the second insulating layer 32b covers at least a portion of the outer surface of the confluence pipe 332, and may completely cover the outer surface of the confluence pipe 332, or it may cover only one side of the confluence pipe 332 facing the battery cell 20, and the second insulating layer 32b can be used to insulate and isolate the confluence pipe 332 and the battery cell 20, thereby reducing the risk of short-circuiting the battery and improving the safety performance of the battery.

[0460] In this embodiment, the confluence pipe 332 may be located on one side of the battery cell 20, and since the confluence pipe 332 similarly contains a fluid medium, the confluence pipe 332 can similarly be used to perform heat exchange of the battery cell 20, the second insulating layer 32b covers at least a portion of the outer surface of the confluence pipe 332, the second insulating layer 32b may completely cover the outer surface of the confluence pipe 332, or it may cover only one side of the confluence pipe 332 facing the battery cell 20, the second insulating layer 32b can be used to insulate and isolate the confluence pipe 332 and the battery cell 20, thereby reducing the risk of short-circuiting the battery and improving the safety performance of the battery.

[0461] Referring to Figures 20, 21, 25, and 26, in this embodiment, the two merging pipes 332 are a first bath member 341 and a second bath member 342, respectively. A medium inlet 3412 is installed in the first bath member 341, and a first merging chamber 3411 communicating with the medium inlet 3412 is formed inside the first bath member 341. A medium outlet 3422 is installed in the second bath member 342, and a second merging chamber 3421 communicating with the medium outlet 3422 is formed inside the second bath member 342. Both the first merging chamber 3411 and the second merging chamber 3421 communicate with each flow path 30c.

[0462] A medium inlet 3412 is installed in the first bus member 341, and a medium outlet 3422 is installed in the second bus member 342. The first confluence chamber 3411 of the first bus member 341 and the second confluence chamber 3421 of the second bus member 342 are both in communication with each flow path 30c. The fluid medium flows from the medium inlet 3412 into the first confluence chamber 3411, and is then distributed to each flow path 30c via the first confluence chamber 3411. The fluid medium in each flow path 30c flows along the second direction Y to the second bus member 342 and collects in the second confluence chamber 3421, and is discharged from the medium outlet 3422.

[0463] In another embodiment, a merging pipe 332 does not need to be installed on the partition plate 33. Instead, one medium inlet 3412 and one medium outlet 3422 are installed correspondingly in each flow path 30c, and the fluid medium flows into each flow path 30c from its respective medium inlet 3412 and is discharged from each flow path 30c. This installation method makes it easy to independently control the total amount and flow velocity of the fluid medium in each flow path 30c.

[0464] In this embodiment, the installation of the first bus member 341 helps to distribute the fluid medium to each flow path 30c, which is advantageous for uniform temperature control of the battery cell 20, and the installation of the second bus member 342 helps to rapidly discharge the fluid medium, improving heat exchange efficiency.

[0465] In some embodiments, as shown in Figures 25 and 26, the thickness of the second insulating layer 32b is h3, the wall thickness of the main plate 331 is h2, and h3 / h2 ≥ 0.00625. As the creepage distance between the junction pipe 332 and the battery cell 20 increases, safety is enhanced, and the risk of electrical contact between the two is reduced in various usage scenarios.

[0466] h3 / h2 can also be 0.01, 0.015, 0.1, 0.15, 0.2, 0.25, 0.3, 0.35, 0.4, etc.

[0467] In some embodiments, the insulating layer 32 has a uniform thickness structure, i.e., the thickness h1 of the first insulating layer 30a is equal to the thickness h3 of the second insulating layer 30b, so h1 = h3. In another embodiment, the thickness of the first insulating layer is different from the thickness of the second insulating layer.

[0468] In some embodiments, referring to Figures 20, 21, and 25-29, a first conduit 343 is provided at the medium inlet 3412, and a second conduit 344 is provided at the medium outlet 3422. The insulating layer 32 further includes a third insulating layer 32c. A portion of the third insulating layer 32c covers the outer surface of the first conduit 343, thereby insulating and isolating the battery cell 20 from the first conduit 343, and / or a portion of the third insulating layer 32c covers the outer surface of the second conduit 344, thereby insulating and isolating the battery cell 20 from the second conduit 344.

[0469] The first guide pipe 343 may be installed only at the medium inlet 3412, or the second guide pipe 344 may be installed only at the medium outlet 3422, or the first guide pipe 343 may be installed at the medium inlet 3412 and the second guide pipe 344 may be installed at the medium outlet 3422. Figures 20 and 21 show the case in which the first guide pipe 343 is installed at the medium inlet 3412 and the second guide pipe 344 is installed at the medium outlet 3422.

[0470] As shown in Figures 20, 21, 25-29, when a portion of the insulating layer 32 covers the outer surface of the first guide pipe 343, the insulating layer 32 may cover only a portion of the outer surface of the first guide pipe 343. For example, a portion of the insulating layer 32 may cover only the outer circumferential surface of the first guide pipe 343, leaving the two end faces along the axial direction of the first guide pipe 343 uncovered. Compared to the case where the insulating layer 32 covers only the main plate 331, the first bus member 341, and the second bus member 342, this increases the creepage distance between the battery cell 20 and the portion of the first guide pipe 343 not covered by the insulating layer 32, thereby reducing the risk of the battery 100 short-circuiting. Alternatively, a portion of the insulating layer 32 may cover the entire outer surface of the first guide pipe 343. In another embodiment, as shown in Figure 25, the insulating layer 32 may not cover the outer surface of the first guide pipe 343.

[0471] As shown in Figures 20, 21, 25-29, when a portion of the insulating layer 32 covers the outer surface of the second guide pipe 344, the insulating layer 32 may cover only a portion of the outer surface of the second guide pipe 344. For example, the insulating layer 32 may cover only the outer circumferential surface of the second guide pipe 344, leaving the two end faces along the axial direction of the second guide pipe 344 uncovered. Compared to the case where the insulating layer 32 covers only the main plate 331, the first bus member 341, and the second bus member 342, this increases the creepage distance between the battery cell 20 and the portion of the second guide pipe 344 not covered by the insulating layer 32, thereby reducing the risk of the battery 100 short-circuiting. Alternatively, the insulating layer 32 may cover the entire outer surface of the second guide pipe 344.

[0472] In another embodiment, the insulating layer 32 does not need to cover the outer surface of the second guide pipe 344.

[0473] As shown in Figures 20, 21, and 25-29, the first guide pipe 343 and the second guide pipe 344 are arranged coaxially, and the axial direction of both the first guide pipe 343 and the second guide pipe 344 are parallel to the second direction y.

[0474] As shown in Figures 20, 21, and 25-29, one end of the first guide pipe 343 is inserted into the medium inlet 3412 of the first bus member 341 and welded to the first bus member 341. One end of the second guide pipe 344 is inserted into the medium outlet 3422 of the second bus member 342 and welded to the second bus member 342.

[0475] A first stopper portion 361 is provided on the outer circumferential surface of the first guide pipe 343, and the first stopper portion 361 protrudes from the outer circumferential surface of the first guide pipe 343 along the radial direction of the first guide pipe 343, and the first stopper portion 361 is used to limit the distance to which the first guide pipe 343 is inserted into the interior of the first bath member 341. After the first guide pipe 343 is inserted into the medium inlet 3412 of the first bath member 341, the first stopper portion 361 abuts against the outer wall of the first bath member 341. The first guide pipe 343 may also be welded to the first bath member 341 via the first stopper portion 361.

[0476] A second stopper portion 371 is provided on the outer circumferential surface of the second guide pipe 344, and the second stopper portion 371 protrudes from the outer circumferential surface of the second guide pipe 344 along the radial direction of the second guide pipe 344. The second stopper portion 371 is used to limit the distance to which the second guide pipe 344 is inserted into the interior of the second bath member 342. After the second guide pipe 344 is inserted into the medium outlet of the second bath member 342, the second stopper portion 371 abuts against the outer wall of the second bath member 342. The second guide pipe 344 may also be welded to the second bath member 342 via the second stopper portion 371.

[0477] In another embodiment, the first guide pipe 343 does not need to be installed at the medium inlet 3412, and the second guide pipe 344 does not need to be installed at the medium outlet 3422.

[0478] By installing the first guide pipe 343, the fluid medium can more easily flow into the first confluence chamber 3411 of the first bus member 341, and by installing the second guide pipe 344, the fluid medium can more easily be discharged from the second confluence chamber 3421 of the second bus member 342. A portion of the insulating layer 32 covers the outer surface of the first guide pipe 343, insulating and isolating the first guide pipe 343 from the battery cell 20, and / or a portion of the insulating layer 32 covers the outer surface of the second guide pipe 344, insulating and isolating the second guide pipe 344 from the battery cell 20, thereby reducing the risk of short-circuiting the battery 100 and improving the safety performance of the battery 100.

[0479] In some embodiments, along the second direction y, the first bus member 341 and the second bus member 342 are located on either side of the battery cell 20, and the third direction is perpendicular to the second direction y.

[0480] The first bus member 341 and the second bus member 342 are located on both sides of the battery cell 20, and the arrangement direction of the first bus member 341 and the second bus member 342 is offset from the extension direction of the tabs of the battery cell 20. As a result, both the first bus member 341 and the second bus member 342 are installed offset from the electrical energy output poles of the battery cell 20, thereby preventing the first bus member 341 and the second bus member 342 from affecting the charging and discharging of the battery cell 20, or preventing the first bus member 341 and the second bus member 342 from affecting the series connection, parallel connection, or series-parallel connection between each battery cell 20.

[0481] As shown in Figure 20, the main body plate 331 protrudes from both ends of the battery cell 20 along the second direction y, along the second direction y. The first bus member 341 and the second bus member 342 are connected to both ends of the main body plate 331 along the second direction y, respectively. Multiple battery cells 20 can be stacked and arranged facing each other along the second direction y, without interfering with the first bus member 341 and the second bus member 342, allowing for a more compact arrangement of multiple battery cells 20, which is advantageous in reducing the volume of the battery 100.

[0482] In some embodiments, the battery cell 20 includes a battery case 21 and an insulating layer (not shown) connected to the outer surface of the battery case 21, the insulating layer being used to insulate and isolate the heat conductive member 3a from the battery case 21.

[0483] The insulating layer may be a blue film covering the outer surface of the battery case 21, or an insulating coating layer coated on the outer surface of the battery case 21. The insulating layer is connected to the surface of the battery case 21 of the battery cell 20, and the insulating layer on the battery cell 20 and the insulating layer 32 on the heat conductive member 3a both insulate and isolate the battery cell 20 and the heat conductive member 3a, further reducing the risk of a short circuit in the battery 100.

[0484] In some embodiments, as shown in Figures 52 to 64, the heat conduction member 3a includes a first heat conduction plate 3331, a second heat conduction plate 3332, and a partition member 335 that are stacked and installed, with the partition member 335 installed between the first heat conduction plate 3331 and the second heat conduction plate 3332, the first heat conduction plate 3331 and the partition member 335 both defining a first flow path 34, and the second heat conduction plate 3332 and the partition member 335 both defining a second flow path 35.

[0485] When the heat conductive member 3a is installed between two adjacent battery cells 20, the first flow path 34 and the second flow path 35 correspond to the two adjacent battery cells 20, respectively, and the fluid medium in the first flow path 34 and the fluid medium in the second flow path 35 can 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 does not press against the flow path corresponding to the other battery cell 20 in a way that reduces its dimensions, or has little effect on the dimensions of the flow path corresponding to the other battery cell 20, thereby ensuring the heat exchange effect of the flow path corresponding to the other battery cell 20 and guaranteeing the safety performance of the battery 100 using the heat conductive member 3a.

[0486] Furthermore, the first channel 34 and the second channel 35 each correspond to two adjacent battery cells 20, and each can independently withstand the deformation caused by the expansion of the corresponding battery cell 20. Therefore, the expansion of one battery cell 20 is less likely to interfere with the expansion of the other battery cell 20, or does not affect the expansion of the other battery cell 20, which is advantageous for releasing the expansion of two adjacent battery cells 20. This reduces the occurrence of premature depressurization or serious thermal runaway accidents of the battery cells 20 due to the expansion of two adjacent battery cells 20 interfering with each other, thereby improving the safety performance of the battery 100.

[0487] Both the first channel 34 and the second channel 35 are used to contain a fluid medium, and the fluid medium can flow through the first channel 34 and the second channel 35. Here, the first channel 34 and the second channel 35 may be independent of each other, and the fluid medium in the first channel 34 does not flow into the second channel 35, and the fluid medium in the second channel 35 does not flow into the first channel 34.

[0488] Exemplary, along the extension direction of the first channel 34, the first channel 34 has a first inlet and a first outlet located at both ends of the first channel 34, and the fluid medium flows into the first channel 34 from the first inlet and is discharged through the first channel 34 from the first outlet; along the extension direction of the second channel 35, the second channel 35 has a second inlet and a second outlet located at both ends of the second channel 35, and the fluid medium flows into the second channel 35 from the second inlet and is discharged through the second channel 35 from the second outlet.

[0489] The first channel 34 and the second channel 35 may be in communication with each other, and the fluid medium in the first channel 34 can flow into the second channel 35, or the fluid medium in the second channel 35 can flow into the first channel 34.

[0490] In an embodiment where there is one battery cell 20, the heat conductive member 3a is installed on one side of the battery cell 20 and is located between the battery cell 20 and the inner wall of the housing 10. The first flow path 34 is installed closer to the battery cell 20 than the second flow path 35, and the second flow path 35 is installed closer to the inner wall of the housing 10 than the first flow path 34.

[0491] In embodiments where there are multiple battery cells 20, the multiple battery cells 20 are stacked and arranged along a certain direction (the stacking direction of the first heat conduction plate 3331, the second heat conduction plate 3332, and the partition member 335, the first direction x).

[0492] As shown in Figures 53 and 54, a heat conductive member 3a may be installed between two adjacent battery cells 20. For the sake of explanation, the two adjacent battery cells 20 are defined as the first battery cell 21 and the second battery cell 22, respectively. The arrangement direction of the first flow path 34 and the second flow path 35 is the same as the stacking direction of the first battery cell 21 and the second battery cell 22, and the arrangement direction of the first flow path 34 and the second flow path 35 is the same as the stacking direction of the first heat conductive plate 3331, the second heat conductive plate 3332 and the partition member 335. The first channel 34 is installed in correspondence with the first battery cell 21, and the first heat conduction plate 3331 is used to conduct heat to the first battery cell 21. The fluid medium in the first channel 34 is used to exchange heat with the first battery cell 21 and regulate the temperature of the first battery cell 21. The second channel 35 is installed in correspondence with the second battery cell 22, and the second heat conduction plate 3332 is used to conduct heat to the second battery cell 22. The fluid medium in the second channel 35 is used to exchange heat with the second battery cell 22 and regulate the temperature of the second battery cell 22.

[0493] A thermal conduction connection refers to the ability to transfer heat between the two. For example, when the first thermal conduction plate 3331 is thermally connected to the first battery cell 21, heat transfer is possible between the first battery cell 21 and the first thermal conduction plate 3331, and heat transfer is possible between the fluid medium in the first channel 34 and the first battery cell 21 via the first thermal conduction plate 3331, thereby realizing heat exchange between the fluid medium in the first channel 34 and the first battery cell 21. When the second thermal conduction plate 3332 is thermally connected to the second battery cell 22, heat transfer is possible between the second battery cell 22 and the second thermal conduction plate 3332, and heat transfer is possible between the fluid medium in the second channel 35 and the second battery cell 22 via the second thermal conduction plate 3332, thereby realizing heat exchange between the fluid medium in the second channel 35 and the second battery cell 22.

[0494] As shown in Figures 53 and 54, the fluid medium in the first channel 34 and the fluid medium in the second channel 35 can 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 does not press against the other battery cell 20 in a way that reduces the dimensions of the channel corresponding to the other battery cell 20, or has little effect on the dimensions of the channel corresponding to the other battery cell 20. This ensures the heat exchange effect of the channel corresponding to the other battery cell 20 and guarantees the safety performance of the battery 100 using the heat conductive member 3a. For example, if the battery cell 20 (first battery cell 21) corresponding to the first flow path 34 expands, the dimensions of the first heat conduction member, second heat conduction member and partition member of the first flow path 34 in the stacking direction (i.e., the first direction x) will decrease. However, the first battery cell 21 will not affect the dimensions of the first heat conduction plate 3331, second heat conduction plate 3332 and partition member 335 of the second flow path 35 in the stacking direction, or will have little effect on the dimensions of the first heat conduction plate 3331, second heat conduction plate 3332 and partition member 335 of the second flow path 35 in the stacking direction, thereby ensuring the heat exchange capacity of the second flow path 35 for the corresponding battery cell 20 (second battery cell 22). Similarly, when the battery cell 20 (second battery cell 22) corresponding to the second flow path 35 expands, the dimensions of the first heat conductive member 3331, the second heat conductive member 3332, and the partition member 335 of the second flow path 35 in the stacking direction decrease. However, the second battery cell 22 does not affect the dimensions of the first heat conductive plate 3331, the second heat conductive plate 3332, and the partition member 335 of the first flow path 34 in the stacking direction, or has little effect on the dimensions of the first heat conductive plate 3331, the second heat conductive plate 3332, and the partition member 335 of the first flow path 34 in the stacking direction, thereby ensuring the heat exchange capacity of the first flow path 34 to the corresponding battery cell 20 (second battery cell 22).

[0495] Since the first channel 34 and the second channel 35 correspond to two adjacent battery cells 20, each can independently withstand the deformation caused by the expansion of the corresponding battery cell 20. Therefore, the expansion of one battery cell 20 is less likely to interfere with the expansion of the other battery cell 20, or will not affect the expansion of the other battery cell 20, which is advantageous for releasing the expansion of two adjacent battery cells 20. This reduces the occurrence of premature depressurization or serious thermal runaway accidents of the battery cells 20 due to the expansion of two adjacent battery cells 20 interfering with each other, further improving the safety performance of the battery 100. In addition, the fluid medium in the first channel 34 and the fluid medium in the second channel 35 can exchange heat with the two battery cells 20, reducing the temperature difference between the two adjacent battery cells 20, thereby ensuring the safety performance of the battery 100 using the heat conductive member 3a.

[0496] The number of first channels 34 may be one or more, and the number of second channels 35 may be one or more. In some embodiments, there are multiple first channels 34 and / or multiple second channels 35.

[0497] The number of first channels 34 may be multiple and the number of second channels 35 may be one, or the number of first channels 34 may be one and the number of second channels 35 may be multiple, or the number of first channels 34 may be multiple and the number of second channels 35 may be multiple. In the embodiment where there are multiple first channels 34, the first heat conduction plate 3331 and the partition member 33 both define multiple first channels 34, the multiple first channels 34 are arranged sequentially along the third direction, and each first channel 34 extends along the second direction y. The third direction is perpendicular to the second direction y. In the embodiment where there are multiple second channels 35, the second heat conduction plate 3332 and the partition member 33 both define multiple second channels 35, the multiple second channels 35 are arranged sequentially along the third direction, and each second channel 35 extends along the second direction y.

[0498] In another embodiment, the arrangement direction of the multiple first channels 34 may differ from the arrangement direction of the multiple second channels 35. The extension direction of the first channels 34 may differ from the extension direction of the second channels 35. Naturally, the extension directions of the multiple first channels 34 may differ, and the extension directions of the multiple second channels 35 may also differ.

[0499] The presence of multiple first flow channels 34 and / or multiple second flow channels 35 allows the heat conductive member 3a to accommodate more fluid media, which is advantageous for more uniform distribution of the fluid media, improving heat exchange efficiency and uniformity of heat exchange, and reducing temperature differences in different regions of the battery cell 20.

[0500] There are several methods for forming the first channel 34. In some embodiments, as shown in Figures 55 to 59, a first groove 3351 is installed in the partition member 335, and the first groove 3351 forms part of the first channel 34.

[0501] The statement "The first groove 3351 forms part of the first flow path 34" means that the groove wall of the first groove 3351 becomes part of the wall of the first flow path 34. The first groove 3351 can take on multiple forms. For example, as shown in Figure 56, along the stacking direction of the first heat conduction plate 3331, the second heat conduction plate 3332, and the partition member 335, the partition member 335 has a first surface 3352 facing the first heat conduction plate 3331 and a second surface 3353 facing the second heat conduction plate 3332. The first surface 3352 and the second surface 3353 are arranged opposite each other, and the first groove 3351 is installed on the first surface 3352 and is recessed in the direction toward the second surface 3353. Furthermore, as shown in Figure 58, for example, the first groove 3351 is installed on the first surface 3352, the first groove 3351 is recessed in the direction approaching the second surface 3353 from the first surface 3352, and the first protrusion 3354 is formed on the second surface 3353 at a position corresponding to the first groove 3351.

[0502] The first groove 3351 penetrates at least one end of the partition member 335 along the second direction y. In this embodiment, the first groove 3351 penetrates both ends of the partition member 335 along the second direction y, and the fluid medium can flow in from one end of the first flow path 34 along the second direction y and out from the other end of the first flow path 34 along the second direction y.

[0503] The first groove 3351 installed in the partition member 335 forms part of the first flow path 34, and while ensuring a sufficient cross-sectional area of ​​the first flow path 34, it reduces the dimensions of the thermal management member 30 in the stacking direction of the first heat conduction plate 3331, the second heat conduction plate 3332, and the partition member 335.

[0504] As shown in Figures 55 to 58, in some embodiments, the first heat conduction plate 3331 closes the groove opening of the first recess 3351 facing the first heat conduction plate 3331, thereby forming the first flow path 34.

[0505] In some embodiments, the side of the first heat conduction plate 3331 facing the partition member 335 abuts against the first surface 3352, thereby closing the groove opening of the first groove 3351 facing the first heat conduction plate 3331, forming the first flow path 34. In other words, the first heat conduction plate 3331 forms the other part of the first flow path 34. Therefore, in embodiments where the side of the first heat conduction plate 3331 facing the partition member 335 abuts against the first surface 3352, the groove wall of the first groove 3351 becomes part of the wall of the first flow path 34, and the surface of the first heat conduction plate 3331 facing the partition member 335 becomes the other part of the wall of the first flow path 34. The side of the first heat conduction plate 3331 facing the partition member 335 abuts against the first surface 3352, and the surface of the first heat conduction plate 3331 facing the partition member 335 contacts the first surface 3352. However, there is no connection between them, or the surface of the first heat conduction plate 3331 facing the partition member 335 may be connected to the first surface 3352 by welding or other means.

[0506] In another embodiment, if the first groove 3351 is not installed on the first surface 3352 and there is a gap between the side of the first heat conduction plate 3331 facing the partition member 33 and the first surface 3352, the first groove 3351, the first surface 3352, and the first heat conduction plate 3331 all define the first flow path 34.

[0507] The first heat conduction plate 3331 closes the groove opening of the first groove 3351 facing the first heat conduction plate 3331, thereby forming a first flow path 34. This makes the installation of the first heat conduction plate 3331 and the partition member 335 more compact in the stacking direction of the first heat conduction plate 3331, the second heat conduction plate 3332, and the partition member 445, and reduces the dimensions of the thermal management member 30 in the stacking direction of the first heat conduction plate 3331, the second heat conduction plate 3332, and the partition member 445.

[0508] In another embodiment, if the first groove 3351 is not installed on the first surface 3352 of the partition member 335, and a gap exists between the side of the first heat conduction plate 3331 facing the partition member 335 and the first surface 3352, the first surface 3352 forms part of the wall of the first flow channel 34, and the surface of the first heat conduction plate 3331 facing the partition member 335 forms the other part of the wall of the first flow channel 34.

[0509] There are several methods for forming the second channel 35. As shown in Figures 55 to 58, in some embodiments, a second groove 3355 is installed in the partition member 33, and the second groove 3355 forms part of the second channel 35.

[0510] The statement "The second groove 3355 forms part of the second flow path 35" means that the groove wall of the second groove 3355 becomes part of the wall of the second flow path 35. The second groove 3355 can take on multiple forms. For example, as shown in Figure 55, the second groove 3355 is located on the second surface 3353 and recessed toward the first surface 3352, along the stacking direction of the first heat conduction plate 3331, the second heat conduction plate 3332, and the partition member. Furthermore, as shown in Figure 57, for example, the second groove 3355 is located on the second surface 3353, recessed toward the first surface 3352 from the second surface 3353, and a second protrusion 3356 is formed on the first surface 3352 at a position corresponding to the second groove 3355.

[0511] The second groove 3355 penetrates at least one end of the partition member 335 along the second direction y. In this embodiment, the second groove 3355 penetrates both ends of the partition member 335 along the second direction y, and the fluid medium can flow in from one end of the second flow path 35 along the second direction Z and out from the other end of the second flow path 35 along the second direction Z.

[0512] The second groove 3355 installed in the partition member 335 forms part of the second flow path 35, and while ensuring a sufficient cross-sectional area of ​​the second flow path 35, it reduces the dimensions of the thermal management member 30 in the stacking direction of the first heat conduction plate 3331, the second heat conduction plate 3332, and the partition member 335.

[0513] As shown in Figures 55 to 58, in some embodiments, the second heat conduction plate 3332 closes the groove opening of the second groove 3355 that faces the second heat conduction plate 3332, thereby forming the second flow path 35.

[0514] In some embodiments, the side of the second heat conduction plate 3332 facing the partition member 335 abuts against the second surface 3353, thereby closing the groove opening of the second groove 3355 facing the second heat conduction plate 3332, forming the second flow path 35. In other words, the second heat conduction plate 3332 forms the other part of the first flow path 34. Therefore, in embodiments where the side of the second heat conduction plate 3332 facing the partition member 335 abuts against the second surface 3353, the groove wall of the second groove 3355 becomes part of the wall of the second flow path 35, and the surface of the second heat conduction plate 3332 facing the partition member 335 becomes the other part of the wall of the second flow path 35. The side of the second heat conduction plate 3332 facing the partition member 335 abuts against the second surface 3353, and the surface of the second heat conduction plate 3332 facing the partition member 335 contacts the second surface 3353. However, there is no connection between them, or the surface of the second heat conduction plate 3332 facing the partition member 335 may be connected to the second surface 3353 by welding or other means.

[0515] In another embodiment, if the second groove 3355 is not installed on the second surface 3353, and a gap exists between the side of the second heat conduction plate 3332 facing the partition member 335 and the second surface 3353, the second groove 3355, the second surface 3353, and the second heat conduction plate 3332 all define the second flow path 35.

[0516] The second heat conduction plate 3332 closes the groove opening of the second groove 3355 that faces the second heat conduction plate 3332, thereby forming a second flow path 35. This makes the installation of the second heat conduction plate 3332 and the partition member 335 more compact in the stacking direction of the first heat conduction plate 3331, the second heat conduction plate 3332, and the partition member 335, and reduces the dimensions of the heat conduction member 3a in the stacking direction of the first heat conduction plate 3331, the second heat conduction plate 3332, and the partition member 335.

[0517] Continuing with reference to Figures 55 to 58, in an embodiment in which there are multiple first flow channels 34, there are multiple first grooves 3351, and the multiple first grooves 3351 are arranged along a third direction, which is perpendicular to the stacking direction of the first heat conduction plate 3331, the second heat conduction plate 3332, and the partition member 335. The first heat conduction plate 3331 closes the groove openings of the multiple first grooves 3351 facing the first heat conduction plate 3331, thereby forming multiple first flow channels 34.

[0518] In embodiments where there are multiple second flow channels 35, there are multiple second grooves 3355, and the multiple second grooves 3355 are arranged along a third direction, which is perpendicular to the stacking direction of the first heat conduction plate 3331, the second heat conduction plate 3332, and the partition member 335. The second heat conduction plate 3332 closes the groove openings of the multiple second grooves 3355 facing the second heat conduction plate 3332, thereby forming multiple second flow channels 35.

[0519] Here, the partition member 335 may have only a plurality of first grooves 3351 on the first surface 3352 and one second groove 3355 on the second surface 3353 or no second groove 3355, or the partition member 335 may have a plurality of second grooves 3355 only on the second surface 3353 and one first groove 3351 on the first surface 3352 or no first groove 3351, or the partition member 335 may have a plurality of first grooves 3351 on the first surface 3352 and a plurality of second grooves 3355 on the second surface 3353.

[0520] The presence of multiple first grooves 3351 allows for the formation of multiple first channels 34, and / or the presence of multiple second grooves 3355 allows for the formation of multiple second channels 35, thereby enabling the heat conductive member 3a to accommodate more fluid medium, which is advantageous in distributing the fluid medium more uniformly, improving heat exchange efficiency and uniformity of heat exchange, and reducing temperature differences in different regions of the battery cell 20.

[0521] Referring to Figures 55 to 58, the first groove 3351 and the second groove 3355 are arranged alternately along the third direction.

[0522] "The first grooves 3351 and the second grooves 3355 are arranged alternately along the third direction" means that, along the stacking direction of the first heat conduction plate 3331, the second heat conduction plate 3331 and the partition member 335, at least a portion of each second groove 3355 along the third direction of projection on the first surface 3352 is located between two adjacent first grooves 3351, and / or, along the stacking direction of the first heat conduction plate 3331, the second heat conduction plate 3331 and the partition member 335, at least a portion of each first groove 3351 along the third direction of projection on the second surface 3353 is located between two adjacent second grooves 3355, thereby the first flow path 34 and the second flow path 35 are arranged alternately along the third direction.

[0523] Figures 55 to 56 show the case where, along the stacking direction of the first heat conduction plate 3331, the second heat conduction plate 3332, and the partition member, the projection on the first surface 3352 of each second groove 3355 is entirely located between two adjacent first grooves 3351. Figures 57 to 58 show the case where, along the stacking direction of the first heat conduction plate 3331, the second heat conduction plate 3332, and the partition member, a portion of the projection on the first surface 3352 of each second groove 3355 along the third direction is located between two adjacent first grooves 3351, and a portion of the projection on the first surface 3352 of each second groove 3355 along the third direction overlaps with the first groove 3351.

[0524] The first groove 3351 and the second groove 3355 are arranged alternately along the third direction, the first flow path 34 and the second flow path 35 are arranged alternately along the third direction, and when the thermal management member 30 is located between two adjacent battery cells 20, the temperature distribution along the third direction of the battery cell 20 corresponding to the first flow path 34 is uniform, and the temperature distribution along the third direction of the battery cell 20 corresponding to the second flow path 35 is uniform.

[0525] Referring to Figures 57 to 59, in some embodiments, the partition member 335 is a corrugated plate, which has a simple structure and is easy to manufacture.

[0526] In this embodiment, the first groove 3351 is installed on the first surface 3352, the first groove 3351 is recessed in the direction approaching the second surface 3353 from the first surface 3352, and the first protrusion 3354 is formed at a position on the second surface 3353 corresponding to the first groove 3351. The second groove 3355 is installed on the second surface 3353, the second groove 3355 is recessed in the direction approaching the first surface 3352 from the second surface 3353, and the second protrusion 3356 is formed at a position on the first surface 3352 corresponding to the second groove 3355. The first groove 3351 and the second groove 3355 are arranged alternately along the third direction, and the first protrusion 3354 and the second protrusion 3356 are arranged alternately along the third direction to form a corrugated plate.

[0527] In another embodiment, as shown in Figures 55 and 56, the partition member 335 may be a member of a different structural form.

[0528] As shown in Figure 60, the first flow path 34 may be formed using other methods. For example, in another embodiment, the partition member 335 includes a main body 3357 and a first partition 3358, with both ends of the first partition 3358 along the first direction x connected to the main body 3357 and the first heat conduction plate 3331, respectively, and the main body 3357, the first partition 3358, and the first heat conduction plate 3331 together define the first flow path 34.

[0529] Both the main body 3357 and the first partition 3358 are flat plate structures, defining a first space between the main body 3357 and the first heat conduction plate 3331. The number of first partition 3358 may be one or more. In embodiments where there are multiple first partition 3358, the multiple first partition 3358 are arranged at intervals along the first direction Y, and the multiple first partition 3358 divide the first space into multiple first subspaces, thereby defining multiple first flow paths 34 together with the main body 3357, the first heat conduction plate 3331, and the multiple first partition 3358. The main body 3357 and the first partition 3358 may be integrally molded, for example, by integral molding processes such as injection or extrusion. The main body 3357 and the first partition 3358 are installed separately, and further dissolveThey are connected as a single unit by connectors, screws, etc.

[0530] The main body 3357, the first partition 3358, and the first heat conduction plate 3331 all define multiple first flow channels 34, allowing the heat conduction member 3a to accommodate more fluid media, which is advantageous for more uniform distribution of the fluid media, improving heat exchange efficiency and uniformity of heat exchange, reducing temperature differences in different regions of the battery cell 20, and the first partition 3358 can support the first heat conduction plate 3331, enhancing the deformation resistance of the first heat conduction plate 3331.

[0531] The second flow path 35 may also be formed using other methods. For example, referring to Figure 13, the partition member 33 further includes a second partition portion 3359, the ends of which the second partition portion 3359 along the second direction Z are connected to the main body portion 3357 and the second heat conduction plate 3332, respectively, and the main body portion 3357, the second partition portion 3359 and the second heat conduction plate 3332 together define the second flow path 35.

[0532] Both the main body 3357 and the second partition 3359 are flat plate structures, defining a second space between the main body 3357 and the second heat conduction plate 3332. The number of second partitions 3359 may be one or more. In embodiments where there are multiple second partitions 3359, the multiple second partitions 3359 are arranged at intervals along the first direction Y, and the multiple second partitions 3359 divide the second space into multiple second subspaces, thereby defining multiple second flow paths 35 by the main body 3357, the second heat conduction plate 3332, and the multiple second partitions 3359. The main body 3357 and the second partition 3359 may be integrally molded; for example, the main body 3357 and the first partition 3359 may be molded by an integral molding process such as injection or extrusion. The main body 3357 and the second partition 3359 are installed separately, and further dissolve The components are connected integrally by fasteners, screws, or other means. Alternatively, the main body 3357, the first partition 3358, and the second partition 3359 may be integrally molded.

[0533] The main body 3357, the first partition 3359, and the second heat conduction plate 3332 all define multiple second flow paths 35, and the heat conduction member 3a can accommodate more fluid medium, which is advantageous in distributing the fluid medium more uniformly and improving heat exchange efficiency and uniformity of heat exchange, reducing temperature differences in different regions of the battery cell 20, and the second partition 3359 is 2 Heat conductive plate 333 2 This can support the deformation resistance of the second heat conduction plate 3332.

[0534] The first channel 34 and the second channel 35 may extend along the same direction or along different directions. In this embodiment, the extension direction of the first channel 34 coincides with the extension direction of the second channel 35. Both the first channel 34 and the second channel 35 extend along the second direction y, making manufacturing easy.

[0535] With respect to the fluid medium flowing in the first channel 34 and the second channel 35, the heat exchange capacity between the fluid medium in the first channel 34 and the corresponding battery cell 20 gradually decreases along the direction of fluid medium flow. For example, the heat conductive member 3a is used to cool the battery cell 20. Along the direction of fluid medium flow, the temperature of the fluid medium located in the first channel 34 and the second channel 35 gradually increases, and the ability of the high-temperature fluid medium to cool the battery cell 20 decreases.

[0536] Based on the above, in some embodiments, along the extension direction of the first channel 34 and the second channel 35, the first channel 34 has a first inlet (not shown) and a first outlet (not shown), and the second channel 35 has a second inlet (not shown) and a second outlet (not shown), and the direction from the first inlet to the first outlet is opposite to the direction from the second inlet to the second outlet.

[0537] The first inlet allows the fluid medium to flow into the first channel 34, the first outlet discharges the fluid medium from the first channel 34, the second inlet allows the fluid medium to flow into the second channel 35, and the second outlet discharges the fluid medium from the second channel 35.

[0538] As an example, in an embodiment shown in Figure 61, where heat conductive members 3a are provided on both sides of the battery cell 20, one side of the battery cell 20 has a first flow path 34 of one heat conductive member 3a to Correspondingly, the other side of the battery cell 20 corresponds to the second flow path 35 of another heat conduction member 3a, and the fluid media on both sides of the battery cell 20 flow along opposite directions, and along the extension direction (second direction y) of the first flow path 34 and the second flow path 35, the heat exchange capacity of the fluid media in the first flow path 34 and the fluid media in the second flow path 35 can be complemented, reducing the local temperature difference of the battery cell 20.

[0539] Therefore, since 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 channel 34 is opposite to the flow direction of the fluid medium in the second channel 35, the heat exchange effect is higher in the region of the battery cell 20 closer to the inlet of the corresponding channel, and lower in the region of the battery cell 20 closer to the outlet of the corresponding channel. This arrangement of the first channel 34 and the second channel 35 reduces local differences in the thermal management of the battery cell 20 in the battery 100, making heat exchange more uniform.

[0540] As shown in Figure 62, in some embodiments, the heat conduction member 3a includes a communication cavity 36 located at one end of the partition member 335, the first flow path 34 communicates with the communication cavity 36, and the second flow path 35 communicates with the communication cavity 36.

[0541] The communication cavity 36 is located at one end of the partition member 33, and the partition member 335, the first heat conduction plate 3331, and the second heat conduction plate 3332 all define the communication cavity 36. In this embodiment, the communication cavity 36 is the gap between one end of the partition member 335 and the first heat conduction plate 3331 and the second heat conduction plate 3332 in the second direction y.

[0542] In another embodiment, the communication cavity 36 may be formed from other structures, for example, the heat conduction member 3a further includes a communication tube, the first flow path 34 and the second flow path 35 are in communication via the communication tube, and the internal passage of the communication tube is the communication cavity 36.

[0543] The number of first channels 34 and second channels 35 may be multiple. In an embodiment where there are multiple first channels 34, all first channels 34 may communicate with the communication cavity 36, and the fluid medium in each first channel 34 is discharged from the first outlet through the first channel 34, then flows through the communication cavity 36 and into the second channel 35 from the second inlet. In another embodiment, some of the multiple first channels 34 may communicate with the communication cavity 36, and the fluid medium in these first channels 34 flows from the first outlet through the communication cavity 36 and into the second channel 35 from the second inlet, while other parts of the multiple first channels 34 do not communicate with the communication cavity 36, and the fluid medium in these first channels 34 cannot flow into the second channel 35. The directions indicated by the white arrows in Figure 62 are the flow directions of the fluid medium in the first channels 34 and second channels 35.

[0544] In an embodiment where there are multiple second flow paths 35, all second flow paths 35 may communicate with a communication cavity 36, and the fluid medium in the first flow path 34 is discharged from the first outlet through the first flow path 34, then flows through the communication cavity 36 and into each second flow path 35 from the second inlet. In another embodiment, some of the multiple second flow paths 35 may communicate with a communication cavity 36, and the fluid medium in the first flow path 34 that communicates with the communication cavity 36 flows through the communication cavity 36 and then into the second flow path 35 that communicates with the communication cavity 36 from the second inlet, while some of the other second flow paths 35 do not communicate with the communication cavity 36, and the fluid medium in the first flow path 34 cannot flow into these second flow paths 35.

[0545] In this embodiment, there are multiple first flow channels 34 and second flow channels 35, and each first flow channel 34 and each second flow channel 35 communicates with a communication cavity 36.

[0546] The number of first channels 34 and second channels 35 may be the same or different.

[0547] When the first channel 34 communicates with the communication cavity 36 and the second channel 35 communicates with the communication cavity 36, the fluid medium in the first channel 34 can flow into the second channel 35, and the fluid medium flowing out from the outlet (first outlet) of the first channel 34 flows into the second channel 35 from the inlet (second inlet) of the second channel 35. This arrangement reduces local differences in the thermal management of the battery cells 20 within the battery 100, making heat exchange more uniform.

[0548] Referring to Figures 25, 26, 62, and 63, in some embodiments, the heat conductive member 3a includes a medium inlet 3412 and a medium outlet 3422, the medium inlet 3412 communicating with a communication cavity 36 via a first flow path 34, and the medium outlet 3422 communicating with the communication cavity 36 via a second flow path 35.

[0549] The medium inlet 3412 is installed on the first heat conduction plate 3331 and communicates with the first flow path 34, and the medium outlet 3422 is installed on the second heat conduction plate 3332 and communicates with the second flow path 35.

[0550] The fluid medium flows into the first channel 34 from the medium inlet 3412, then flows into the second channel 35 via the communication cavity 36, and is discharged from the medium outlet 3422. The fluid medium exchanges heat with the battery cell 20 during its flow. The directions indicated by the white arrows in Figures 62 and 63 are the flow directions of the fluid medium in the first channel 34 and the second channel 35.

[0551] By installing a medium inlet 3412 and a medium outlet 3422, the fluid medium can easily flow into the first channel 34 and the second channel 35, and after heat exchange with the battery cell 20, the fluid medium can be easily discharged from the first channel 34 and the second channel 35. As a result, the fluid medium that has not undergone heat exchange flows into the first channel 34 and the second channel 35, ensuring the heat exchange capacity of the fluid medium in the first channel 34 and the second channel 35.

[0552] Referring to Figures 62 and 63, in some embodiments, along the extending direction of the first channel 34, the medium inlet 3412 is located at one end of the first heat conduction plate 3331 away from the communication cavity 36, and along the extending direction of the second channel 35, the medium outlet 3422 is located at one end of the second heat conduction plate 3332 away from the communication cavity 36.

[0553] The extension direction of the first channel 34 and the extension direction of the second channel 35 are both parallel to the second direction y. In another embodiment, the extension direction of the first channel 34 may be different from the extension direction of the second channel 35. For example, the extension direction of the first channel 34 may be parallel to the second direction y, and the extension direction of the second channel 35 may be parallel to a predetermined direction, and the angle between the predetermined direction and the second direction Z may be acute or predetermined direction The first direction is perpendicular to the second direction y, and the pre-set direction is perpendicular to the first direction x.

[0554] A medium inlet pipe 37 is inserted into the medium inlet 3412, making it easy to connect the medium inlet 3412 with a device that supplies the fluid medium. A medium flow discharge pipe 38 is inserted into the medium outlet 3422, making it easy to connect the medium outlet 3422 with a device that recovers the fluid medium.

[0555] The medium inlet 3412 is located at one end of the first heat conduction plate 3331 away from the communication cavity 36, and the medium outlet 3422 is located at one end of the second heat conduction plate 3332 away from the communication cavity 36. The fluid medium flows from the medium inlet 3412 into the first flow path 34, then flows through the entire first flow path 34 along the direction of extension of the first flow path 34, then flows into the second flow path 35, and then flows through the entire second flow path 35 along the direction of extension of the second flow path 35 before being discharged from the medium outlet 3422. As a result, the path through which the fluid medium flows within the heat management member 30 is maximized, allowing for sufficient heat exchange with the battery cell 20 and improving heat exchange efficiency and uniformity.

[0556] As shown in Figures 62 and 63, in some embodiments, one end of the first channel 34 away from the communication cavity 36 along its extension direction and the other end of the second channel 35 away from the communication cavity 36 along its extension direction do not communicate with each other.

[0557] In this embodiment, the extension direction of the first channel 34 and the extension direction of the second channel 35 are both parallel to the second direction y. The communication cavity 36 is located at one end of the partition member 33 along the second direction y. As shown in Figure 63, the heat conduction member 3a further includes a sealing member 39 (or a blocking member), which is installed at one end of the partition member 335 away from the communication cavity 36 along the second direction y, thereby blocking one end of the second channel 35 away from the communication cavity 36 along the second direction y, and preventing the fluid medium flowing from the medium inlet 3412 into the first channel 34 from flowing into the second channel 35 in the direction away from the communication cavity 36 within the first channel 34. Naturally, in another embodiment, the sealing member 39 can also be installed at one end of the partition member 335 away from the communication cavity 36 along the second direction y, and can be used to close one end 40 of the first flow path 34 away from the communication cavity 36 along the second direction y, thereby preventing the fluid medium flowing into the first flow path 34 from the medium inlet 3412 from flowing into the second flow path 35 along the first flow path 34 in a direction away from the communication cavity 36.

[0558] The sealing member 39 and the partition member 335 may be installed separately, and the separately installed sealing member 39 and partition member 335 may be connected to form an integrated structure, for example by welding, bonding, or other methods. The sealing member 39 and partition member 335 may be integrally molded, for example by an integral molding process such as injection or pressing.

[0559] Along the stacking direction of the first heat conduction plate 3331, the second heat conduction plate 3332, and the partition member 335, the projection of the media outlet 3422 on the partition member 353 is located on the side facing the communication cavity 36 of the sealing member 39, thereby allowing the fluid medium in the second flow path 35 to be discharged from the media inlet 3412.

[0560] One end of the first channel 34 that is away from the communication cavity 36 along its extension direction and the other end of the second channel 35 that is away from the communication cavity 36 along its extension direction do not communicate with each other. When the fluid medium flows into the first channel 34, it flows through the entire first channel 34 before flowing from the communication cavity 36 into the second channel 35, and after flowing through the entire second channel 35, it is discharged from the medium outlet 3422. As a result, the path through which the fluid medium flows within the heat management member 30 is maximized, allowing for sufficient heat exchange with the battery cell 20 and improving heat exchange efficiency and uniformity.

[0561] In some embodiments, there are multiple first flow channels 34 and second flow channels 35, and each first flow channel 34 and each second flow channel 35 communicates with a communication cavity 36.

[0562] In another embodiment, the number of first channels 34 may be one, and the number of second channels 35 may be multiple, with each second channel 35 communicating with a communication cavity 36; or the number of first channels 34 and second channels 35 may both be one; or the number of second channels 35 may be one, and the number of first channels 34 may be multiple, with each first channel 34 communicating with a communication cavity 36.

[0563] Both the first channel 34 and the second channel 35 are multiple and both communicate with the connecting cavity 36, the fluid medium in each first channel 34 can flow into each second channel 35, and the fluid medium flowing out from the outlet of the first channel 34 flows into the second channel 35 from the inlet of the second channel 35. This arrangement reduces local differences in the thermal management of the battery cells 20 within the battery 100 and makes heat exchange more uniform.

[0564] In embodiments where there are multiple first flow channels 34, the number of medium inlets 3412 may be set differently. For example, referring to Figures 53 and 63, in some embodiments, there is one medium inlet 3412, and each first flow channel 34 communicates with a communication cavity 36 and a medium inlet 3412.

[0565] In an embodiment in which the sealing member 39 closes one end of the second flow path 35 away from the communication cavity 36, as shown in Figure 63, a flow separation gap 310 is formed between the side of the sealing member 39 away from the communication cavity 36 and the first heat conduction plate 3331 and the second heat conduction plate 3332, and the medium inlet 3412 communicates with each first flow path 34 via the flow separation gap 310. The fluid medium flowing in from the medium inlet 3412 enters the flow separation gap 310 and is then distributed from the flow separation gap 310 to each first flow path 34.

[0566] Therefore, having only one medium inlet 3412 enables the fluid medium to flow synchronously into each first flow path 34, and the number of medium inlets 3412 installed on the first heat conduction plate 3331 is reduced, thereby decreasing the impact of the installation of medium inlets 3412 on the structural strength of the first heat conduction plate 3331. In addition, the structure of the structural heat conduction member 3a becomes simpler and easier to manufacture.

[0567] In another embodiment, there are multiple media inlets 3412, and each first flow path 34 communicates with a communication cavity 36 and one media inlet 3412.

[0568] The number of media inlets 3412 is the same as the number of first flow channels 34, and there is a one-to-one correspondence between them. Each media inlet 3412 allows the fluid medium to flow into the corresponding first flow channel 34, making it easy to control the fluid medium flow into each first flow channel 34 independently, and to control the fluid medium to flow into the required first flow channel 34 according to actual requirements, thereby controlling the arrangement of the fluid medium inside the heat control tube and rationally controlling the temperature of the battery cell 20.

[0569] In embodiments where there are multiple second flow paths 35, as shown in Figure 52, there are multiple medium outlets 3422, and each second flow path 35 communicates with a communication cavity 36 and one medium outlet 3422.

[0570] There are multiple second flow channels 35 and multiple media outlets 3422. The media outlets 3422 and 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 media outlet 3422.

[0571] In another embodiment, there may be only one medium outlet 3422, which communicates with each second flow path 35, and all the fluid medium in all of the second flow paths 35 is discharged from the medium outlet 3422.

[0572] Each second channel 35 communicates with a communication cavity 36 and a single medium outlet 3422, allowing the fluid medium to be quickly discharged from the second channel 35, thereby improving heat exchange efficiency.

[0573] In some embodiments, the partition member 335 has an integrally molded structure.

[0574] The partition member 335 may be formed using an integral molding method such as pressing or injection molding. In the embodiment where the partition member 335 is a corrugated plate, press molding is used for the corrugated plate. The partition member 335 is an integrally molded structure, which is easy to manufacture and has high structural strength.

[0575] In some embodiments, the first heat conduction plate 3331 may be a single-piece molded structure, and the second heat conduction plate 3332 may also be a single-piece molded structure. For example, both the first heat conduction plate 3331 and the second heat conduction plate 3332 may be manufactured using injection molding or press molding.

[0576] In some embodiments, the first heat conduction plate 3331 is welded to the partition member 335, and / or the second heat conduction plate 3332 is welded to the partition member 335.

[0577] The first heat conduction plate 3331 is welded to the partition member 335, and the second heat conduction plate 3332 and the partition member 335 are connected by another method (e.g., adhesive), or the second heat conduction plate 3332 may be in contact with the partition member 335 but not connected. The second heat conduction plate 3332 is welded to the partition member 335, and the first heat conduction plate 3331 and the partition member 335 are connected by another method (e.g., adhesive), or the first heat conduction plate 3331 may be in contact with the partition member 335 but not connected. In this embodiment, both the first heat conduction plate 3331 and the second heat conduction plate 3332 are welded to the partition member 335.

[0578] partition component In an embodiment where 335 is a corrugated plate, the first heat conduction plate 3331 is welded to the second protrusion 3356, and the second heat conduction plate 3332 is welded to the first protrusion 3354 (see Figure 58). This connection method allows the partition member 335 to support the first heat conduction plate 3331 and the second heat conduction plate 3332, improving the ability of the first heat conduction plate 3331 and the second heat conduction plate 3332 to resist the expansion deformation of the battery cell 20.

[0579] The stability of the connection between the first heat conduction plate 3331 and the partition member 335 is improved by welding, and the stability of the connection between the second heat conduction plate 3332 and the partition member 335 is improved by welding.

[0580] As shown in Figure 64, the battery 100 includes adjacent first battery cells 21 and second battery cells 22 and a heat conductive member 3a, the heat conductive member 3a being installed between the first battery cell 21 and the second battery cell 22, the first heat conductive plate 3331 being heat conductively connected to the first battery cell 21 and the second heat conductive plate 3332 being heat conductively connected to the second battery cell 22.

[0581] The fluid medium in the first channel 34 and the fluid medium in the second channel 35 can exchange heat with the first battery cell 21 and the second battery cell 22, respectively, thereby reducing the temperature difference between the first battery cell 21 and the second battery cell 22.

[0582] The expansion of the first battery cell 21 does not press against the second flow path 35 corresponding to the second battery cell 22 in such a way that it reduces the dimensions of the second flow path 35 corresponding to the second battery cell 22, or the effect of the expansion on the dimensions of the second flow path 35 corresponding to the second battery cell 22 is small, thereby ensuring the heat exchange capacity of the second flow path 35 corresponding to the second battery cell 22. The expansion of the second battery cell 22 does not press against the first flow path 34 corresponding to the first battery cell 21 in such a way that it reduces the dimensions of the first flow path 34 corresponding to the first battery cell 21, or the effect of the expansion on the dimensions of the first flow path 34 corresponding to the first battery cell 21 is small, thereby ensuring the heat exchange capacity of the first flow path 34 corresponding to the first battery cell 21, and thus ensuring the safety performance of the battery 100 using the heat conductive member 3a.

[0583] Furthermore, since the first flow path 34 and the second flow path 35 correspond to the first battery cell 21 and the second battery cell 22, respectively, the first flow path 34 can withstand deformation due to the expansion of the first battery cell 21, and the second flow path 35 can withstand deformation due to the expansion of the second battery cell 22. Therefore, the expansion of the first battery cell 21 does not interfere with or affect the expansion of the second battery cell 22, and the expansion of the second battery cell 22 does not interfere with or affect the expansion of the first battery cell 21. This is advantageous for releasing the expansion of the first and second battery cells 21 and 22, reducing the occurrence of premature depressurization or serious thermal runaway accidents of the first and second battery cells 21 and 22 due to mutual interference of their expansion, and further improving the safety performance of the battery 100.

[0584] Continuing with reference to Figure 64, in some embodiments, the heat conductive member 3a may be installed on the side of the first battery cell 21 away from the second battery cell 22, and the reinforcing member 30 may be installed on the side of the second battery cell 22 away from the first battery cell 21.

[0585] To simplify the explanation, we define the heat conductive member 3a located between the first battery cell 21 and the second battery cell 22 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 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 as the third heat conductive member.

[0586] The flow directions of the fluid medium in the first channel 34 and the fluid medium in the second channel 35 of the first heat conductor are opposite. The flow directions of the fluid medium in the first channel 34 and the fluid medium in the second channel 35 of the second heat conductor are opposite. The flow directions of the fluid medium in the first channel 34 and the fluid medium in the second channel 35 of the third heat conductor are opposite.

[0587] The second heat conduction plate 3332 of the second heat conduction member is heat-conductively connected to the side of the first battery cell 21 away from the second battery cell 22, and the flow direction of the fluid medium in the first flow channel 34 of the first heat conduction member is opposite to the direction of the heat conduction member 3a in the second flow channel 35 of the second heat conduction member. This allows the heat exchange capacity of the fluid medium located on both sides of the first battery cell 21 along the second direction y to be complemented, thereby reducing the local temperature difference of the first battery cell 21.

[0588] The first heat conductive plate 3331 of the third heat conductive member is the first of the second battery cell 22 battery The heat conduction connection is made on the side away from the cell, and the flow direction of the fluid medium in the second channel 35 of the first heat conduction member is opposite to the direction of the heat conduction member 3a in the first channel 34 of the third heat conduction member. This allows the heat exchange capacity of the fluid medium located on both sides of the second battery cell 22 along the second direction y to be complemented, thereby reducing the local temperature difference of the second battery cell 22.

[0589] In some embodiments, as shown in Figures 65 to 82, at least a portion of the heat conduction member 3a is configured to be deformable when subjected to pressure, thereby providing the heat conduction member 3a with a certain expansion space for the battery cell 20 and reducing the pressing force between the heat conduction member 3a and the battery cell 20.

[0590] In some embodiments, as shown in Figure 65, the heat conductive member 3a includes a laminated 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, improving its heat dissipation capacity. The elastic modulus of the compressible layer 500 is lower than that of the heat exchange layer 400. When subjected to the expansion force released by the battery cell 20, the compressible layer 500 deforms along the direction of the expansion force of the battery cell 20, thereby absorbing the expanded portion of the battery cell 20 and ensuring the expansion space of the battery cell 20, thus preventing the entire battery 100 from deforming significantly. Furthermore, the compressible layer 500 is advantageous for absorbing tolerances when assembling the battery, helping to maintain a compact structure for mounting and the battery.

[0591] The heat exchange layer 400 is a layered structure for exchanging heat with the battery cell 20. When the temperature of the battery cell 20 is higher than the temperature of the heat exchange layer 400, heat from the battery cell 20 is conducted to the heat exchange layer 400, lowering the temperature of the battery cell 20; when the temperature of the battery cell 20 is lower than the heat exchange temperature, heat from the heat exchange layer 400 is conducted to the battery cell 20, raising the temperature of the battery cell 20.

[0592] The compressible layer 500 has a layered structure that undergoes significant compressive deformation when subjected to an applied force.

[0593] Selectively, when the compressible layer 500 is subjected to a force acting along the stacking direction, the compressible layer 500 may be compressed and significantly deformed along the stacking direction.

[0594] The modulus of elasticity is the direct proportional relationship between stress and strain in a material or structure during the elastic deformation stage. Assuming that the material or structure is in the elastic deformation stage and the stress is the same, a higher modulus of elasticity indicates a smaller deformation capacity, and a lower modulus of elasticity indicates a larger deformation capacity.

[0595] The heat exchange layer 400 may consist of one layer or multiple layers, and the compressible layer 500 may also consist of one layer or multiple layers.

[0596] For example, as shown in Figure 66, the heat conduction member 3a includes one heat exchange layer 400 and one compressible layer 500; as shown in Figure 67, the heat conduction member 3a includes two heat exchange layers 400 and one compressible layer 500, with the compressible layer 500 placed between the two heat exchange layers 400; and as shown in Figure 68, the heat conduction member 3a includes one heat exchange layer 400 and two compressible layers 500, with the heat exchange layer 400 placed between the two compressible layers 500.

[0597] In some embodiments, the compressible layer 500 includes a compressible cavity 501, which is a cavity whose volume decreases after being subjected to the force acting upon the compressible layer 500.

[0598] When subjected to the expansion force released by the battery cell 20, the gas in the compressible cavity 501 is compressed and deforms in the direction of the expansion force of the battery cell 20 in the compressible layer 500.

[0599] In some embodiments, the compressible cavity 501 is filled with a phase change material or an elastic material.

[0600] Phase-change materials are substances that can change their state and provide latent heat when the temperature remains constant. The process of changing physical properties is called a phase change, and during this process, phase-change materials absorb or release a large amount of latent heat.

[0601] Elastic materials refer to materials with a low modulus of elasticity, and these materials deform significantly under the action of the expansion force of a battery cell.

[0602] When a phase change material is filled into the compressible cavity 501, the thermal capacity of the battery can be improved, and the thermal conductive member 3a can keep the battery cell 20 warm or absorb heat from the battery cell 20. When an elastic material is filled into the compressible cavity 501, the elastic material has good elasticity, and when subjected to the expansion force released from the battery cell, the elastic material is compressed and deforms along the direction of the expansion force of the battery cell 20 in the compressible layer 500, and rebounds after the expansion force has disappeared. Furthermore, the elastic material can increase the support strength of the compressible layer 500.

[0603] Selectively, elastic materials include rubber materials.

[0604] In some embodiments, the heat exchange layer 400 includes a heat exchange cavity 401 (also referred to as the cavity 30a above) for housing a heat exchange medium. The heat exchange medium is a medium for exchanging heat with the battery cell and is generally a liquid or the like with a high specific heat capacity that can maintain fluidity at the battery's operating temperature.

[0605] Selectively, the heat exchange cavity 401 may be sealed or open.

[0606] In some embodiments, as shown in Figure 69, a first support member 410 (also referred to as the reinforcing rib) is installed inside the heat exchange cavity 401, and the first support member 410 is supported inside the heat exchange cavity 401 to prevent the heat exchange cavity 401 from deforming due to pressure. The first support member 410 may also be used to improve the strength of the heat exchange layer 400, thereby preventing the heat exchange layer 400 from deforming significantly after receiving the expansion force released from the battery cell.

[0607] Selectively, the elastic modulus of the first support member 410 is greater than that of the compressible layer 500.

[0608] Since the elastic modulus of the compressible layer 500 is smaller than that of the first support member 410, it deforms easily, and after the heat conductive member 3a receives the expansion force released from the battery cell, the compressible layer 500 can deform significantly along the direction of the expansion force of the battery cell 20, while the heat exchange layer 400 does not deform at all.

[0609] In some embodiments, the heat exchange layer 400 and the compressible layer 500 are arranged in a stacked configuration along a first direction, and the first support member 410 is supported within the heat exchange cavity 401 along the first direction x.

[0610] When the heat conductive member 3a is applied to a battery, the battery cell 20 is generally brought into contact with the heat conductive member 3a along the first direction x, and the expansion force subsequently released by the battery cell 20 is also basically along the first direction x. The first support member 410, which is supported within the heat exchange cavity 401 along the first direction x, can significantly improve the elastic modulus of the heat exchange layer 400. After the heat conductive member 3a receives the expansion force released from the battery cell along the first direction x, the compressible layer 500 can deform significantly along the first direction x, while the heat exchange layer 400 is basically undeformed.

[0611] In some embodiments, referring to Figure 67, the compressible layer 500 is placed within the heat exchange cavity 401.

[0612] Both ends of the heat conductive member 3a along ...

Claims

1. It includes a housing, a battery cell, a heat conductive member, and a fixing member. The housing has a housing cavity, the battery cell is housed in the housing cavity, the battery cell includes a first wall and a second wall, there is an angle between the first wall and the second wall, the area of ​​the first wall is larger than the area of ​​the second wall, the heat conductive member is provided in the housing cavity, the heat conductive member is installed facing the first wall and is connected by heat conduction to exchange heat with the battery cell, the fixing member is connected to the second wall and the housing, and thereby the battery cell is fixed in the housing cavity. The battery cells are a plurality and are arranged along a second direction, the heat conductive member includes a partition plate, the partition plate extends along the second direction and is connected to the first wall of each battery cell in the plurality of battery cells, and the second direction is parallel to the first wall. A cavity is installed inside the partition plate. The partition plate further includes a pair of heat conduction plates positioned opposite each other along a first direction, the cavity is positioned between the pair of heat conduction plates, and the first direction is perpendicular to the first wall. The partition plate further includes reinforcing ribs, which are provided between the pair of heat conductive plates. A battery in which the reinforcing ribs include a plurality of first reinforcing ribs, the ends of each of the plurality of first reinforcing ribs are each connected to the pair of heat conductive plates, the plurality of first reinforcing ribs are installed at an inclination with respect to a first direction, and any two adjacent first reinforcing ribs among the plurality of first reinforcing ribs are installed in parallel.

2. The battery according to claim 1, wherein the first wall is the wall with the largest area in the battery cell.

3. The battery according to claim 1 or 2, wherein the heat conductive member is bonded to the first wall via a first adhesive layer.

4. The battery according to claim 3, wherein the bottom of the heat conductive member is bonded to the bottom wall of the housing cavity via a second adhesive layer, and / or the fixing member includes a third adhesive layer, and the second wall of the battery cell is bonded to the housing via the third adhesive layer.

5. The battery according to claim 4, wherein the thickness of the first adhesive layer is less than or equal to the thickness of the second adhesive layer, and / or the thickness of the first adhesive layer is less than or equal to the thickness of the third adhesive layer.

6. The battery according to claim 4, wherein the thermal conductivity of the first adhesive layer is equal to or greater than the thermal conductivity of the second adhesive layer, and / or the thermal conductivity of the first adhesive layer is equal to or greater than the thermal conductivity of the third adhesive layer.

7. The battery according to claim 4, wherein the ratio between the thickness of the first adhesive layer and the thermal conductivity of the first adhesive layer is a first ratio, the ratio between the thickness of the second adhesive layer and the thermal conductivity of the second adhesive layer is a second ratio, the ratio between the thickness of the third adhesive layer and the thermal conductivity of the third adhesive layer is a third ratio, 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.

8. The battery according to claim 1 or 2, wherein the heat conductive 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 partition plate.

9. The battery according to claim 1 or 2, wherein in the third direction, the dimension H1 of the partition plate and the dimension 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.

10. The battery according to claim 1 or 2, wherein the cavity is used to house a heat exchange medium for regulating the temperature of the battery cell.

11. The battery according to claim 1 or 2, wherein in a first direction, the dimension of the cavity is W, the capacity Q of the battery cell and the dimension W of the cavity satisfy 1.0 Ah / mm ≤ Q / W ≤ 400 Ah / mm, and the first direction is perpendicular to the first wall.

12. The battery according to claim 1 or 2, wherein the reinforcing rib is connected to at least one of the pair of heat conductive plates.

13. The battery according to claim 1 or 2, wherein the angle between the plurality of first reinforcing ribs and the first direction is in the range of 30° to 60°.

14. The battery according to claim 1 or 2, wherein the reinforcing rib further includes a second reinforcing rib, one end of the second reinforcing rib is connected to one of the pair of heat conductive plates, and the other end of the second reinforcing rib is installed at a distance from the other of the pair of heat conductive plates.

15. The battery according to claim 14, wherein the second reinforcing rib extends along the first direction and protrudes from one of the pair of heat conductive plates.

16. The battery according to claim 14, wherein the plurality of first reinforcing ribs and second reinforcing ribs are installed at intervals.

17. The battery according to claim 1 or 2, wherein in the first direction, the thickness D of the heat conductive plate and the dimension W of the cavity satisfy 0.01 ≤ D / W ≤ 25.

18. The battery according to claim 10, wherein the partition plate is provided with a medium inlet and a medium outlet, the cavity is in communication with the medium inlet and the medium outlet, and a cavity is provided inside the partition plate that is blocked from both the medium inlet and the medium outlet.

19. The battery according to claim 1 or 2, wherein at least a portion of the heat conductive member is configured to be deformable when subjected to pressure.

20. The battery according to claim 1 or 2, wherein the heat conductive member is provided with a relief structure, and the relief structure is used to provide space for the battery cell to expand.

21. The battery according to claim 1 or 2, wherein the housing includes a main body and a bottom cover installed at the bottom of the main body, and the bottom cover and the main body are sealed together and together form the sealed housing cavity.

22. The battery according to claim 1 or 2, wherein the fixing member includes a mounting member, the mounting member described above is provided on the upper part of the housing, and the battery cell is provided on the surface of the mounting member described above.

23. The battery according to claim 22, wherein the minimum thickness H of the mounting member and the weight M1 of the battery satisfy 0.0002 mm / kg < H / M1 ≤ 0.2 mm / kg.

24. The battery according to claim 22, wherein the mounting member is used to define the housing cavity, and the battery cell is suspended from the mounting member.

25. The battery according to claim 24, wherein the battery cell is bonded to the mounting member described above.

26. The battery according to claim 22, wherein the battery cells are a plurality, the plurality of battery cells are arranged and installed in a second direction, the second direction is perpendicular to the vertical direction, the mounting member is connected to the ceiling wall of the plurality of battery cells, the battery cells are located below the mounting member, and the relationship between the dimension N of the mounting member in the vertical direction and the weight M2 of the battery cell satisfies 0.04 mm / kg ≤ N / M2 ≤ 100 mm / kg.

27. The battery according to claim 26, wherein a cavity is installed inside the mounting member.

28. The battery according to claim 27, wherein the cavity is used to house a heat exchange medium for regulating the temperature of the battery cell.

29. The battery according to claim 1 or 2, wherein the fixing member further includes a protective assembly, the protective assembly being installed between the battery cell and the bottom wall of the housing cavity, thereby supporting and supporting the battery cell.

30. The battery according to claim 29, wherein the protective assembly includes a protective strip, the protective strip contacts the battery cell.

31. The battery according to claim 30, wherein a plurality of protective strips are installed, the plurality of protective strips are installed at intervals in the second direction and extend along the first direction, and the first direction, the second direction and the direction perpendicular to it are each perpendicular to each other.

32. The battery according to claim 30, wherein the protective assembly further includes a main plate, the protective strip is connected to the main plate, and the main plate is located between the protective strip and the bottom wall.

33. The battery according to claim 30, wherein the end cover of the battery cell includes a functional region and a shoulder portion, the electrode terminals of the battery cell are installed in the functional region, the shoulder portion is located on both sides of the functional region along a second direction, the battery cell abuts the protective strip via the shoulder portion, and the second direction is perpendicular to the vertical direction.

34. The battery according to claim 30, wherein, in the vertical direction, the thickness of the protective strip is greater than the elongated height of the portion of the electrode terminals of the battery cell that is exposed from the battery cell.

35. The battery according to claim 31, wherein the orthographic projection of the electrode terminals of the battery cell onto the bottom wall is located between the orthographic projections of the adjacent protective strip onto the bottom wall.

36. The battery according to claim 31, wherein the electrode terminals of two adjacent battery cells are electrically connected via a bus member, and in the first direction, the extended length of one of the two adjacent protective strips is shorter than the extended length of the other, thereby forming a relief notch, the relief notch is used to give way to the bus member.

37. The battery according to claim 31, wherein the battery cell further includes a pressure reducing mechanism, the pressure reducing mechanism is located on the same side as the electrode terminals of the battery cell, and the orthographic projection of the pressure reducing mechanism on the bottom wall is located between the orthographic projections on the bottom wall of the adjacent protective strip.

38. The battery according to claim 1 or 2, wherein the battery cell further includes a battery case, an electrode assembly is provided within the battery case, a pressure reducing mechanism is installed in the battery case, and the pressure reducing mechanism is integrally molded with the battery case.

39. The battery according to claim 38, wherein the battery case includes integrally molded non-fragile regions and fragile regions, a groove is provided in the battery case, the non-fragile region is formed around the groove, the fragile region is formed at the bottom of the groove, the fragile region is arranged to break when the battery cell releases internal pressure, and the pressure reduction mechanism includes the fragile region.

40. The battery according to claim 1 or 2, wherein the battery cell includes an electrode assembly, the electrode assembly includes a positive electrode sheet and a negative electrode sheet, the positive electrode sheet and / or the negative electrode sheet include 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.

41. The battery cell includes an electrode assembly, 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 is a ternary material, dLi ２ MnO ３ ・(1-d) LiMO ２ and LiMPO ４ The battery according to claim 1 or 2, comprising at least one of the following, wherein 0 < d < 1, and M comprises one or more selected from Fe, Ni, Co, and Mn, and the shell comprises a crystalline inorganic, the crystalline inorganic having a full width at half maximum of the main peak measured by X-ray diffraction of 0 to 3°, and the crystalline inorganic comprising one or more metal oxides and inorganic salts.

42. The battery cell includes an electrode assembly, 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, and the positive electrode active material is LiMPO ４ It has, and the M includes Mn and a non-Mn element, the non-Mn element is If the ionic radius of the non-Mn element is a and the ionic radius of the manganese element is b, then condition 1 is that |a - b| / b is 10% or less. When the valence change voltage of the non-Mn element is U, condition 2 is that 2V < U < 5.5V, Condition 3 states that the chemical activity of the chemical bond formed from the non-Mn element and O is greater than or equal to the chemical activity of the P-O bond. The battery according to claim 1 or 2, satisfying at least one of condition 4, the highest value number of the non-Mn element is 6 or less.

43. A power consumption device including a battery according to claim 1 or 2 for supplying electrical energy.

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