Batteries and power-consuming devices

Abstract

A battery and a power consumption device, the battery including a housing, at least two battery cells, and a reinforcing element, the housing having an accommodating cavity, the at least two battery cells being accommodated in the accommodating cavity, each battery cell including an electrode assembly and an electrode terminal, the electrode assembly being electrically connected to the electrode terminal, the battery cell including a first wall, the first wall being the wall with the largest area in the battery cell, the reinforcing element being connected to the at least two battery cells, and the reinforcing element being thermally connected to the first walls of the at least two battery cells.

Description

[Technical Field]

[0001] This application relates to battery technology, and more particularly to batteries and power consuming devices.

[0002] CROSS-REFERENCE TO RELATED APPLICATIONS This application is an international patent application filed on February 21, 2022, with application number PCT / CN2022 / 077152; an international patent application filed on February 21, 2022, with application number PCT / CN2022 / 077153; an international patent application filed on February 21, 2022, with application number PCT / CN2022 / 077151; an international patent application filed on February 21, 2022, with application number PCT / CN2022 / 077147; International patent application with application number PCT / CN2022 / 077149, filed on February 21, 2022; international patent application with application number PCT / CN2022 / 077150, filed on February 21, 2022; international patent application with application number PCT / CN2022 / 098447, filed on June 13, 2022; international patent application with application number PCT / CN2022 / 098727, filed on June 14, 2022; application number P CT / CN2022 / 099229, an international patent application filed on June 16, 2022, application number PCT / CN2022 / 100488, an international patent application filed on June 22, 2022, application number PCT / CN2022 / 100486, an international patent application filed on June 22, 2022, application number PCT / CN2022 / 111347, an international patent application filed on August 10, 2022, application number PCT / C N2022 / 099786, filed on June 20, 2022, application number PCT / CN2022 / 101392, filed on June 27, 2022, and application number PCT / CN2022 / 101395, filed on June 27, 2022, are filed based on, and claim priority from, the above international patent applications, the entire contents of which are incorporated herein by reference. [Background technology]

[0003] In recent years, new energy vehicles have been increasingly developed, and in the field of electric vehicles, power batteries play an irreplaceable and important role as the power source for electric vehicles.

[0004] Although the energy density of a battery is an important parameter in battery performance, other performance parameters of the battery must also be considered when improving the energy density of the battery. Therefore, how to improve battery performance is an urgent technical issue in battery technology. Summary of the Invention

[0005] The purpose of the present application is to solve at least one technical problem existing in the related art, and to this end, the present application provides a battery that improves energy density while simultaneously ensuring heat conduction within the battery, thereby improving battery performance.

[0006] The present application further provides a power consuming device having the battery described above.

[0007] A battery according to an embodiment of the first aspect of the present application includes a housing, at least two battery cells, and a reinforcing element, wherein the housing has an accommodating cavity, the at least two battery cells are accommodated in the accommodating cavity, each of the battery cells includes an electrode assembly and an electrode terminal, the electrode assembly is electrically connected to the electrode terminal, the battery cell includes a first wall, the first wall is the wall with the largest area in the battery cell, the reinforcing element is connected to the at least two battery cells, and the reinforcing element is thermally connected to the first walls of the at least two battery cells.

[0008] According to the battery of the embodiments of the present application, there is no need to install a structure such as a beam inside the housing that houses at least two battery cells, and the space utilization rate inside the battery can be maximized, thereby improving the energy density of the battery and at the same time ensuring heat conduction in the battery via the above-mentioned reinforcing elements.

[0009] In some embodiments, each of the battery cells further includes a second wall connected to the first wall, the first wall is disposed across the second wall, and the electrode terminal is disposed on the second wall.

[0010] In some embodiments, each of the battery cells includes two of the first walls disposed opposite to each other and two of the second walls disposed opposite to each other, and at least two of the electrode terminals are disposed, or at least two of the electrode terminals are disposed on the same second wall, or at least one of the electrode terminals is disposed on each of the second walls.

[0011] In some embodiments, the electrode terminal is provided on the first wall.

[0012] In some embodiments, at least two of the battery cells are arranged in a first direction, and in the first direction, each of the battery cells has a first surface that is arranged opposite to the first wall, and an escape groove is provided on the first surface, and the escape groove of one of two adjacent battery cells is used to accommodate the electrode terminal of the other battery cell, and the first direction is perpendicular to the first wall.

[0013] In some embodiments, the first wall is cylindrically shaped.

[0014] In some embodiments, second walls are provided at both ends of the first wall in the axial direction, and the electrode terminal is provided on at least one of the second walls.

[0015] In some embodiments, the electrode terminal is exposed on one of the second walls, and the electrode assembly includes a positive electrode sheet and a negative electrode sheet, one of the positive electrode sheet and the negative electrode sheet being electrically connected to the electrode terminal, and the other of the positive electrode sheet and the negative electrode sheet being electrically connected to the first wall or the other second wall.

[0016] In some embodiments, at least one of the battery cells is a soft-pack battery cell.

[0017] In some embodiments, the battery cell further includes a pressure reducing mechanism, and the pressure reducing mechanism and the electrode terminal are installed on the same wall of the battery cell.

[0018] In some embodiments, the battery cell further includes a pressure reducing mechanism, and the pressure reducing mechanism and the electrode terminal are respectively installed on two walls of the battery cell.

[0019] In some embodiments, the reinforcing element is adhered to the first walls of the at least two battery cells via a first adhesive layer.

[0020] In some embodiments, the bottom of the reinforcement element is adhered to the bottom wall of the accommodating cavity via a second adhesive layer, and / or the bottom of the battery cell is adhered to the bottom wall of the accommodating cavity via a third adhesive layer.

[0021] 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.

[0022] 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.

[0023] 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, and 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.

[0024] In some embodiments, the reinforcing element is a thermally conductive member, and the thermally conductive member is used for heat exchange with the battery cell.

[0025] In some embodiments, the thermally conductive member comprises a metallic material and / or a non-metallic material.

[0026] In some embodiments, the heat conducting member includes a metal plate and an insulating layer, the insulating layer is disposed on the surface of the metal plate, or the heat conducting member is a non-metallic material plate.

[0027] In some embodiments, a cavity is provided within the thermally conductive member.

[0028] In some embodiments, the cavity is used to accommodate a heat exchange medium for regulating the temperature of the battery cell.

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

[0030] In some embodiments, the reinforcing element further includes an insulating layer, which is used to insulate the first wall of the battery cell from the partition plate.

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

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

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

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

[0035] In some embodiments, in a 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.

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

[0037] In some embodiments, the cavity is adapted to accommodate a heat exchange medium for regulating the temperature of the battery cells.

[0038] In some embodiments, in a first direction, a dimension of the cavity is W, a 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.

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

[0040] In some embodiments, the partition plate further includes a reinforcing rib, and the reinforcing rib is disposed between the pair of heat conduction plates.

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

[0042] In some embodiments, the reinforcing rib includes a first reinforcing rib, both ends of which are connected to the pair of thermal conduction plates, and the first reinforcing rib is installed at an angle to the first direction.

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

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

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

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

[0047] In some embodiments, the thickness D of the heat conduction plate and the dimension W of the cavity in the first direction satisfy 0.01≦D / W≦25.

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

[0049] In some embodiments, a partition member is provided within the cavity, and the partition member is used to divide the cavity to form at least two flow paths.

[0050] In some embodiments, the reinforcing element includes a first thermally conductive plate, a second thermally conductive plate, and the partition member, which are stacked together, the partition member being disposed between the first thermally conductive plate and the second thermally conductive plate, the first thermally conductive plate and the partition member together defining a first flow path, and the second thermally conductive plate and the partition member together defining a second flow path.

[0051] In some embodiments, at least a portion of the reinforcing element is configured to be deformable when subjected to pressure.

[0052] In some embodiments, the reinforcing element comprises a heat exchange layer and a compressible layer arranged in a stack, the compressible layer having a modulus of elasticity less than the modulus of elasticity of the heat exchange layer.

[0053] 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.

[0054] In some embodiments, the reinforcing element includes an outer case and a support member, the support member is housed within the outer case and is used to define a cavity and a deformation cavity spaced apart within the outer case, the cavity is used to allow a heat exchange medium to flow, and the deformation cavity is arranged so that it can deform when the outer case is subjected to pressure.

[0055] In some embodiments, the reinforcing element includes an outer case and an isolation assembly, the isolation assembly is housed within the outer case 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 arranged so that it can deform when the outer case is subjected to pressure.

[0056] In some embodiments, the reinforcement element is provided with a relief structure, which is used to provide space for the battery cells to expand.

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

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

[0059] In some embodiments, battery groups are provided within the housing, the number of the battery groups being two or more and arranged along a first direction, each of the battery groups including two or more of the 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.

[0060] In some embodiments, the reinforcing element is sandwiched between two adjacent groups of the batteries.

[0061] In some embodiments, the battery further includes a connecting pipe module, wherein a cavity for accommodating a heat exchange medium is provided within the reinforcing element, and the connecting pipe module is used to connect the cavities of two or more of the reinforcing elements.

[0062] In some embodiments, the connecting pipe module includes a communication passage, a supply pipe, and a discharge pipe, and along the first direction, the cavities of two adjacent reinforcing elements are connected via the communication passage, and the supply pipe and the discharge pipe are connected to the cavity of the same reinforcing element.

[0063] In some embodiments, each of the battery cells further includes a battery case, the electrode assembly is accommodated 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.

[0064] 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.

[0065] 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.

[0066] In some embodiments, when the minimum thickness of the fragile region is A1, 1 ≦ A1 / S1 ≦ 100 is satisfied.

[0067] 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.

[0068] 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.

[0069] 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.

[0070] In some embodiments, the electrode assembly includes a positive electrode sheet and a negative electrode sheet, the positive electrode sheet and / or the negative electrode sheet includes a current collector and an active material layer, the current collector includes a support layer and a conductive layer, the support layer is used to support the conductive layer, and the conductive layer is used to support the active material layer.

[0071] In some embodiments, along the thickness direction of the support layer, the conductive layer is disposed on at least one side of the support layer.

[0072] In some embodiments, the surface resistance R of the conductive layer at room temperature S satisfies 0.016 Ω / □ ≤ R S ≤ 420 Ω / □.

[0073] 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.

[0074] In some embodiments, the material of the support layer includes one or more of polymer materials and polymer composite materials.

[0075] 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%, or when 8 μm ≤ d1 < 12 μm, 40% ≤ k ≤ 90%, or when 1 μm ≤ d1 < 8 μm, 50% ≤ k ≤ 98%.

[0076] In some embodiments, the electrode assembly includes a positive electrode sheet, the positive electrode sheet includes a positive electrode current collector and a positive electrode active material layer coated on the surface of the positive electrode current collector, the positive electrode active material layer includes a positive electrode active material, the positive electrode active material has a core and a shell covering the core, the core includes at least one of a ternary material, dLi2MnO3·(1 - d)LiMO2, and LiMPO4, 0 < d < 1, 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 metal oxides and inorganic salts.

[0077] In some embodiments, the shell contains at least one of the metal oxide and the inorganic salt and carbon.

[0078] In some embodiments, the electrode assembly includes a positive electrode sheet, the positive electrode sheet includes a positive electrode current collector and a positive electrode active material layer coated on the surface of the positive electrode current collector, the positive electrode active material layer includes a positive electrode active material, the positive electrode active material has LiMPO4, M includes Mn and non-Mn elements, and the non-Mn elements satisfy 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.

[0079] 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.

[0080] In some embodiments, the first doping element satisfies at least one of condition 1: when the ionic radius of the first doping element is a and the ionic radius of the manganese element is b, |a - b| / b is 10% or less, and condition 2: when the valence change voltage of the first doping element is U, 2V < U < 5.5V.

[0081] In some embodiments, the second doping element satisfies at least one of condition 1: the chemical activity of the chemical bond formed by the second doping element and O is not less than the chemical activity of the P-O bond, and condition 2: the highest valence of the second doping element is 6 or less.

[0082] In some embodiments, the positive electrode active material further has a coating layer.

[0083] In some embodiments, the coating layer comprises carbon.

[0084] In some embodiments, the carbon in the coating layer is a mixture of SP2 and SP3 forms of carbon.

[0085] In some embodiments, the molar ratio of carbon in the SP2 form to carbon in the SP3 form is any value within the range of 0.1-10.

[0086] A power consumption device according to an embodiment of the second aspect of the present application includes a battery according to an embodiment of the first aspect of the present application for supplying electrical energy.

[0087] Other aspects and advantages of the present application will be set forth in part in the description that follows, and in part will be obvious from the description, or may be learned by practice of the present application. [Brief explanation of the drawings]

[0088] The above and / or other aspects and advantages of the present application will become apparent and readily understood from the following detailed description of the embodiments taken in conjunction with the drawings.

[0089] [Figure 1] 1 is a schematic diagram of a power consuming device according to an embodiment of the present application; [Figure 2] FIG. 1 is an exploded view of a battery according to an embodiment of the present application. [Figure 3] FIG. 2 is an exploded view of a battery according to another embodiment of the present application. [Figure 4] FIG. 2 is an exploded view of a battery cell according to an embodiment of the present application. [Figure 5] FIG. 5 is a schematic diagram of the battery cell shown in FIG. [Figure 6] FIG. 10 is a schematic diagram of an arrangement of battery cells according to another embodiment of the present application. [Figure 7] FIG. 1 is an exploded view of a battery according to an embodiment of the present application. [Figure 8] FIG. 8 is a schematic diagram illustrating the arrangement of the battery cells shown in FIG. [Figure 9] 1 is a schematic diagram of a battery cell according to an embodiment of the present application. [Figure 10] 1 is a schematic diagram of a battery according to one embodiment of the present application. [Figure 11] FIG. 11 is a schematic view of the heat conduction member shown in FIG. [Figure 12] FIG. 11 is a schematic diagram of the heat conduction member and a plurality of battery cells shown in FIG. [Figure 13] FIG. 11 is another schematic diagram of the battery shown in FIG. [Figure 14] 1 is a schematic diagram of a partial structure of a battery according to an embodiment of the present application; [Figure 15] FIG. 15 is another schematic diagram of the battery shown in FIG. [Figure 16] FIG. 15 is a schematic diagram illustrating the arrangement of the battery cells shown in FIG. [Figure 17] 1 is a schematic diagram of a partial structure of a battery according to an embodiment of the present application. [Figure 18] FIG. 18 is another schematic diagram of the battery shown in FIG. 17. [Figure 19] FIG. 18 is yet another schematic diagram of the battery shown in FIG. 17. [Figure 20] 1 is a schematic diagram of a partial structure of a battery according to an embodiment of the present application. [Figure 21] FIG. 21 is a schematic diagram of the thermal management element shown in FIG. 20. [Figure 22] FIG. 22 is a cross-sectional view of the heat management member shown in FIG. [Figure 23] FIG. 23 is an enlarged view of the circled portion A in FIG. 22. [Figure 24] 1 is a cross-sectional view of a reinforcing element having a partition member disposed therein according to one embodiment of the present application. [Figure 25] FIG. 23 is an enlarged view of the circled portion B in FIG. 22. [Figure 26] FIG. 23 is an enlarged view of the circled portion C in FIG. 22. [Figure 27] 1 is a cross-sectional view of a reinforcing element according to one embodiment of the present application; [Figure 28] FIG. 28 is an enlarged view of the circled portion D in FIG. 27. [Figure 29] FIG. 28 is an enlarged view of the circled area E in FIG. 27. [Figure 30]1 is a schematic diagram of a partial structure of a battery according to an embodiment of the present application. [Figure 31] FIG. 31 is a partial cross-sectional view of the battery shown in FIG. 30. [Figure 32] FIG. 32 is an enlarged view of the circled portion F in FIG. 31. [Figure 33] 2A to 2C are various structural schematic diagrams of partition plates according to some embodiments of the present application. [Figure 34] FIG. 1 is an exploded view of a battery according to an embodiment of the present application. [Figure 35] 1 is a schematic diagram of a battery according to one embodiment of the present application. [Figure 36] FIG. 36 is a schematic diagram of the connection between the battery cell and the thermal management member shown in FIG. 35. [Figure 37] FIG. 37 is a cross-sectional view taken along the direction AA in FIG. 36. [Figure 38] FIG. 38 is an enlarged view of the circled portion G in FIG. 37. [Figure 39] 1 is a schematic diagram of a battery according to one embodiment of the present application. [Figure 40] FIG. 1 is an exploded view of a battery according to an embodiment of the present application. [Figure 41] FIG. 1 is an exploded view of a battery according to an embodiment of the present application. [Figure 42] 1 is a schematic diagram of a battery according to one embodiment of the present application. [Figure 43] FIG. 43 is another schematic diagram of the battery shown in FIG. 42. [Figure 44] FIG. 43 is yet another schematic diagram of the battery shown in FIG. 42. [Figure 45] FIG. 45 is a cross-sectional view taken along the direction BB in FIG. [Figure 46] 1 is a schematic diagram of a battery according to one embodiment of the present application. [Figure 47] FIG. 47 is a schematic diagram of the reinforcing element shown in FIG. 46. [Figure 48] FIG. 48 is a cross-sectional view of the body plate shown in FIG. 47. [Figure 49] FIG. 48 is another cross-sectional view of the body plate shown in FIG. 47. [Figure 50] FIG. 2 is a cross-sectional view of a body plate according to an embodiment of the present application. [Figure 51]FIG. 2 is a cross-sectional view of a body plate according to an embodiment of the present application. [Figure 52] 1 is a schematic diagram of a reinforcing element according to one embodiment of the present application; [Figure 53] 1 is a cross-sectional view of a reinforcing element according to one embodiment of the present application; [Figure 54] FIG. 54 is another cross-sectional view of the reinforcing element in FIG. 53. [Figure 55] FIG. 2 is a cross-sectional view of a partition member according to an embodiment of the present application. [Figure 56] 1 is a cross-sectional view of a reinforcing element according to one embodiment of the present application; [Figure 57] FIG. 2 is a cross-sectional view of a partition member according to an embodiment of the present application. [Figure 58] 1 is a cross-sectional view of a reinforcing element according to one embodiment of the present application; [Figure 59] 1 is a schematic diagram of a partition member according to an embodiment of the present application. [Figure 60] 1 is a cross-sectional view of a reinforcing element according to one embodiment of the present application; [Figure 61] 1 is a cross-sectional view of a battery according to an embodiment of the present application. [Figure 62] 1 is a cross-sectional view of a battery according to an embodiment of the present application. [Figure 63] 1 is a cross-sectional view of a battery according to an embodiment of the present application. [Figure 64] 1 is a cross-sectional view of a battery according to an embodiment of the present application. [Figure 65] 1 is a schematic diagram of a reinforcing element according to one embodiment of the present application; [Figure 66] 1 is a cross-sectional view of a reinforcing element according to one embodiment of the present application; [Figure 67] 1 is a cross-sectional view of a reinforcing element according to one embodiment of the present application; [Figure 68] 1 is a cross-sectional view of a reinforcing element according to one embodiment of the present application; [Figure 69] 1 is a cross-sectional view of a reinforcing element according to one embodiment of the present application; [Figure 70] 1 is a cross-sectional view of a reinforcing element according to one embodiment of the present application; [Figure 71] FIG. 1 is a schematic diagram of a compressible cavity according to one embodiment of the present application. [Figure 72] 1 is a partial schematic view of a reinforcing element according to one embodiment of the present application; [Figure 73] FIG. 73 is another schematic view of the reinforcing element shown in FIG. 72. [Figure 74] 1 is a schematic diagram of a reinforcing element according to one embodiment of the present application; [Figure 75] 1 is a schematic diagram of a reinforcing element according to one embodiment of the present application; [Figure 76] 1 is a schematic diagram of a reinforcing element according to one embodiment of the present application; [Figure 77] 1 is a schematic diagram of a reinforcing element according to one embodiment of the present application; [Figure 78] 1 is a schematic diagram of a reinforcing element according to one embodiment of the present application; [Figure 79] FIG. 1 is an exploded view of a reinforcing element according to one embodiment of the present application. [Figure 80] FIG. 80 is a schematic view of the flow collecting member shown in FIG. 79. [Figure 81] 1 is a schematic diagram of a battery according to one embodiment of the present application. [Figure 82] 1 is a schematic diagram of a reinforcing element according to one embodiment of the present application; [Figure 83] 1 is a schematic diagram of a reinforcing element according to one embodiment of the present application; [Figure 84] FIG. 84 is an enlarged view of the circled portion H in FIG. 83. [Figure 85] 1 is a schematic diagram of a battery according to one embodiment of the present application. [Figure 86] 1 is a schematic diagram of a reinforcing element according to one embodiment of the present application; [Figure 87] FIG. 87 is another schematic view of the reinforcing element shown in FIG. 86. [Figure 88] 1 is a schematic diagram of a reinforcing element according to one embodiment of the present application; [Figure 89] FIG. 88 is an enlarged view of the circled portion I of FIG. 87. [Figure 90] FIG. 89 is an enlarged view of the circled portion J in FIG. 88. [Figure 91] FIG. 91 is another schematic view of the reinforcing element of FIG. 90. [Figure 92] 1 is a schematic diagram of a reinforcing element according to one embodiment of the present application; [Figure 93]1 is a schematic diagram of a reinforcing element according to one embodiment of the present application; [Figure 94] FIG. 94 is an enlarged view of the circled portion K in FIG. 93. [Figure 95] 1 is a schematic diagram of a reinforcing element according to one embodiment of the present application; [Figure 96] FIG. 96 is an enlarged view of the circled portion L in FIG. 95. [Figure 97] 1 is a partial schematic view of a reinforcing element according to one embodiment of the present application; [Figure 98] 1 is a partial schematic view of a reinforcing element according to one embodiment of the present application; [Figure 99] 1 is a schematic diagram of a reinforcing element according to one embodiment of the present application; [Figure 100] 1 is a schematic diagram of a battery according to one embodiment of the present application. [Figure 101] FIG. 101 is an exploded view of the battery shown in FIG. [Figure 102] 1 is a schematic diagram of a battery according to one embodiment of the present application. [Figure 103] 1 is a schematic diagram of a reinforcing element according to one embodiment of the present application; [Figure 104] 1 is a schematic diagram of a reinforcing element according to one embodiment of the present application; [Figure 105] 1 is a schematic diagram of a reinforcing element according to one embodiment of the present application; [Figure 106] 1 is a schematic diagram of a reinforcing element according to one embodiment of the present application; [Figure 107] 1 is a schematic diagram of a battery according to one embodiment of the present application. [Figure 108] 1 is a schematic diagram of a battery according to one embodiment of the present application. [Figure 109] 1 is a schematic diagram of a battery according to one embodiment of the present application. [Figure 110] 1 is a schematic diagram of a battery cell according to an embodiment of the present application. [Figure 111] 1 is a schematic diagram of a battery according to one embodiment of the present application. [Figure 112] 1 is a schematic diagram of a battery according to one embodiment of the present application. [Figure 113] FIG. 113 is a schematic diagram of the reinforcing element shown in FIG. 112. [Figure 114]1 is a schematic diagram of a reinforcing element according to one embodiment of the present application; [Figure 115] FIG. 115 is another schematic view of the reinforcing element of FIG. 114. [Figure 116] 1 is a structural schematic diagram of an outer case according to some embodiments of the present application. [Figure 117] 117 is a cross-sectional view taken along CC of the outer case shown in FIG. [Figure 118] FIG. 118 is a diagram (schematic diagram) of the crystal grain size of the outer case shown in FIG. 117. [Figure 119] 118 is a partially enlarged view of a portion E of the outer case shown in FIG. 117. [Figure 120] FIG. 10 is a partially enlarged view of an outer case according to another embodiment of the present application. [Figure 121] 1 is a structural schematic diagram of an outer case according to some embodiments of the present application (showing a single-stage shallow groove); [Figure 122] 122 is a cross-sectional view of the outer case shown in FIG. 121 . [Figure 123] FIG. 10 is a schematic view of the structure of an outer case according to another embodiment of the present application (showing a single-stage shallow groove). [Figure 124] 124 is a cross-sectional view of the outer case shown in FIG. 123, taken along line FF. [Figure 125] FIG. 10 is a schematic view of the structure of an outer case according to another embodiment of the present application (showing a single-stage shallow groove). [Figure 126] FIG. 126 is a cross-sectional view of the outer case shown in FIG. 125 . [Figure 127] FIG. 10 is a schematic structural view of an outer case according to another embodiment of the present application (showing a second shallow groove). [Figure 128] 128 is a cross-sectional view of the outer case shown in FIG. 127. FIG. [Figure 129] FIG. 10 is a schematic structural view of an outer case according to another embodiment of the present application (showing a second shallow groove). [Figure 130] 129 is a cross-sectional view of the outer case shown in FIG. [Figure 131] FIG. 10 is a schematic structural view of an outer case according to another embodiment of the present application (showing a second shallow groove). [Figure 132] 132 is a cross-sectional view of the outer case shown in FIG. 131 NN. [Figure 133]FIG. 1 is an axonometric view of an outer casing according to some embodiments of the present application. [Figure 134] FIG. 134 is a structural schematic diagram of the outer case shown in FIG. 133 (showing a one-stage shallow groove and a one-stage countersunk groove). [Figure 135] 135 is a cross-sectional view of the outer case shown in FIG. 134. [Figure 136] 10 is a structural schematic diagram of an outer case according to another embodiment of the present application (showing a one-stage shallow groove and a one-stage counterbore groove). FIG. [Figure 137] 137 is a cross-sectional view of the outer case shown in FIG. 136. [Figure 138] 10 is a structural schematic diagram of an outer case according to another embodiment of the present application (showing a one-stage shallow groove and a one-stage counterbore groove). FIG. [Figure 139] FIG. 139 is a QQ cross-sectional view of the outer case member shown in FIG. [Figure 140] 3A and 3B are structural schematic diagrams of outer cases according to some embodiments of the present application (showing a one-stage shallow groove and a two-stage counterbore groove). [Figure 141] 141 is a cross-sectional view of the outer case member shown in FIG. 140 taken along the line RR. [Figure 142] 10 is a structural schematic diagram of an outer case according to another embodiment of the present application (showing a one-stage shallow groove and a two-stage countersunk groove). FIG. [Figure 143] 143 is a cross-sectional view of the outer case shown in FIG. 142. [Figure 144] 3A and 3B are structural schematic diagrams of outer case members according to some embodiments of the present application (showing a one-stage shallow groove and a two-stage countersunk groove); [Figure 145] FIG. 145 is a cross-sectional view of the outer case shown in FIG. [Figure 146] FIG. 10 is a structural schematic diagram of an outer case according to another embodiment of the present application. [Figure 147] 10 is a diagram (schematic diagram) showing the grain size of an outer case according to another embodiment of the present invention. [Figure 148] 1 is a structural schematic diagram of an end cover according to some embodiments of the present application. [Figure 149] 1 is a structural schematic diagram of a housing according to some embodiments of the present application. [Figure 150] FIG. 10 is a structural schematic diagram of a housing according to another embodiment of the present application. [Figure 151] 1 is a structural schematic diagram of a battery cell according to some embodiments of the present application; [Figure 152] FIG. 2 is a structural schematic diagram of a positive electrode current collector according to a specific embodiment of the present application. [Figure 153] FIG. 2 is a structural schematic diagram of a positive electrode current collector according to another specific embodiment of the present application. [Fig. 154] FIG. 2 is a structural schematic diagram of a negative electrode current collector according to a specific embodiment of the present application. [Figure 155] FIG. 2 is a structural schematic diagram of a negative electrode current collector according to another specific embodiment of the present application. [Figure 156] FIG. 2 is a structural schematic diagram of a positive electrode sheet according to a specific embodiment of the present application. [Figure 157] FIG. 2 is a structural schematic diagram of a positive electrode sheet according to another specific embodiment of the present application. [Figure 158] FIG. 2 is a structural schematic diagram of a negative electrode sheet according to a specific embodiment of the present application. [Figure 159] FIG. 2 is a structural schematic diagram of a negative electrode sheet according to another specific embodiment of the present application. [Figure 160] FIG. 1 is a schematic diagram of a single nailing test of the present application. [Figure 161] This is the temperature change curve of lithium ion battery 1# and lithium ion battery 4# after one nail driving test. [Figure 162] This is the voltage change curve of lithium ion battery 1# and lithium ion battery 4# after one nail driving test. [Figure 163] 1 shows X-ray diffraction (XRD) spectra of undoped LiMnPO4 and the positive electrode active material prepared in Example 2. [Fig. 164] 1 is an energy dispersive X-ray spectroscopy (EDS) spectrum of the positive electrode active material produced in Example 2. [Figure 165] 1 is a schematic diagram of the cathode active material having the core-shell structure of the present application. FIG. [Figure 166] FIG. 1 is a schematic diagram of a cathode active material having a core-shell structure according to an embodiment of the present application. [Figure 167]FIG. 1 is an exploded view of a battery according to some embodiments of the present application. [Figure 168] FIG. 168 is a schematic diagram of the bottom cover, frame and reinforcing element shown in FIG. 167. [Figure 169] FIG. 169 is an exploded view of the bottom cover and frame shown in FIG. 168. [Figure 170] FIG. 169 is a schematic diagram of the frame, reinforcing element and bottom cover shown in FIG. 168. [Figure 171] FIG. 171 is a cross-sectional view taken along line UU in FIG. [Fig. 172] FIG. 171 is a cross-sectional view taken along line VV in FIG. DETAILED DESCRIPTION OF THE INVENTION

[0090] The 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 examples and the drawings are used to exemplify 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 described examples.

[0091] In this description, unless otherwise defined, all technical and scientific terms used have the same meaning as commonly understood by those skilled in the art. The terms used are merely for the purpose of describing specific embodiments and are not intended to limit the present application. In the specification and claims of this application and the description of the drawings, the terms "comprises," "has," and their equivalents are intended to be non-exclusive. The term "plurality" means two or more. The orientations or positional relationships indicated by terms such as "upper," "lower," "left," "right," "inner," and "outer" are merely for ease of explanation and simplification. They do not indicate or imply that the subject devices or elements have a particular orientation or should be configured or operated in a particular orientation, and therefore should not be construed as limiting the present application. Furthermore, terms such as "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. The term "vertical" does not mean vertical in the strict sense, but rather has a margin of error. "Parallel" does not mean parallel in the strict sense, but is within an allowable error range.

[0092] References to "embodiments" herein mean that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of the present application. Appearances of the term "embodiment" in various places in this specification do not necessarily refer to the same embodiment, nor do they refer to embodiments that are mutually exclusive, independent, or alternative to other embodiments. Those skilled in the art will understand, both explicitly and implicitly, that embodiments described herein can be combined with other embodiments.

[0093] Any directional expressions appearing in the following description refer to the directions shown in the drawings and do not limit the specific structure of the present application. It should be further explained that, unless otherwise clearly specified and limited, the terms "attached," "connected," and "connection" should be understood in a broad sense, and may refer to, for example, a fixed connection, a detachable connection, or an integral connection. They may be directly connected, indirectly connected via an intermediate medium, or internal communication between two elements. Those skilled in the art can understand the specific meanings of the above terms in the present application according to specific circumstances.

[0094] The term "and / or" in this application merely describes the relationship between related objects and indicates that three types of relationships can exist. For example, A and / or B can indicate three situations: A exists alone, A and B exist simultaneously, and B exists alone. In this application, the term "or" is inclusive unless otherwise specified. For example, the phrase "A or B" means "A, B, or both A and B." More specifically, the condition "A or B" is satisfied when A is true (or exists) and B is false (or does not exist), or when A is false (or does not exist) and B is true (or exists), or when both A and B are true (or exist).

[0095] The terms "comprise" and "comprises" used herein refer to both open and closed forms unless otherwise specified. For example, the terms "comprise" and "comprises" can indicate that other elements not listed may also be included or may include, or that only the listed elements may be included or may include.

[0096] The "ranges" disclosed herein are defined in terms of lower and upper limits, and a given range is defined by selecting one lower limit and one upper limit, with the selected lower and upper limits defining the boundaries of the particular range. Ranges defined in this manner may be inclusive or exclusive of the endpoints and may be arbitrarily combined, i.e., any lower limit may be combined with any upper limit to form a range. Any lower limit may be combined with any upper limit to form an explicitly stated range, and any lower limit may be combined with another lower limit to form an explicitly stated range. Similarly, any upper limit may be combined with any other upper limit to form an explicitly stated range. Furthermore, even if not explicitly stated, each point or individual value between the endpoints of a range is included within that range. Thus, each point or individual value can be used as its own lower or upper limit, or can be combined with any other point or individual value, or with other lower or upper limits, to form an explicitly stated range.

[0097] For example, if ranges of 60 to 120 and 80 to 110 are recited for a particular parameter, it is understood that the ranges of 60 to 110 and 80 to 120 are also contemplated. Also, if minimum range values ​​of 1 and 2 are recited and maximum range values ​​of 3, 4, and 5 are recited, the ranges of 1 to 3, 1 to 4, 1 to 5, 2 to 3, 2 to 4, and 2 to 5 are all contemplated. Unless otherwise specified, the numerical range "a to b" herein is a shorthand notation for any combination of real numbers between a and b, where a and b are both real numbers. For example, the numerical range "0 to 5" means that all real numbers between "0 and 5" are recited herein, and "0 to 5" is merely a shorthand notation for these combinations of numbers. Furthermore, when a parameter is described as an integer ≧2, this 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, the term "about" a certain value indicates a range, that is, a range of ±10% of the value.

[0098] All embodiments and optional embodiments herein can be combined with each other to form new technical solutions unless otherwise specified. All technical features and optional technical features herein can be combined with each other to form new technical solutions unless otherwise specified. All steps herein can be performed sequentially or randomly, preferably sequentially, unless otherwise specified. For example, when a method includes steps (a) and (b), this means that the method may include steps (a) and (b) performed sequentially, or may include steps (b) and (a) performed sequentially. For example, when a method may further include step (c), this means that step (c) may be added to the method in any order, e.g., the method may include steps (a), (b), and (c), or may include steps (a), (c), and (b), or may include steps (c), (a), and (b), etc.

[0099] In this specification, the terms "coating layer" and "coating" refer to a layer of material coated on a core material, such as lithium manganese phosphate, and the layer of material can completely or partially cover the core. The term "coating layer" is used for ease of explanation and is not intended to limit the scope of the present application. Each coating layer may completely or partially cover the core. Similarly, the term "thickness of the coating layer" refers to the thickness of the layer of material coated on the core in the radial direction of the core.

[0100] In this application, the battery cell may include a lithium ion secondary battery, a lithium ion primary battery, a lithium-sulfur battery, a sodium lithium ion battery, a sodium ion battery, or a magnesium ion battery, etc., but the embodiments of this application are not limited thereto. The battery cell may be cylindrical, flat, rectangular, or have other shapes, etc., but the embodiments of this application are not limited thereto. Battery cells are generally divided into three types based on the packaging method: cylindrical battery cells, prismatic battery cells, and soft-pack battery cells, but the embodiments of this application are not limited thereto.

[0101] The term "battery" as used herein refers to a single physical module containing one or more battery cells to provide higher voltage and capacity. For example, the term "battery" as used herein may include a battery pack. A battery generally includes a housing for packaging one or more battery cells. The housing can prevent liquids or other foreign objects from affecting the charging and discharging of the battery cells.

[0102] The housing 10 may include a first portion 101 and a second portion 102 (shown in FIGS. 2 and 3 ). By fitting the first portion 101 and the second portion 102 together, the first portion 101 and the second portion 102 define an accommodation space for accommodating the battery cells 20. The second portion 102 may have a hollow structure with one end open, and the first portion 101 may have a plate-like structure. The first portion 101 may be fitted over the open side of the second portion 102, thereby forming a housing with an accommodation space. The first portion 101 and the second portion 102 may both have a hollow structure with one end open, and the open side of the first portion 101 may be fitted over the open side of the second portion 102, thereby forming a housing with an accommodation space. Of course, the first portion 101 and the second portion 102 may have various shapes, such as a cylindrical body or a rectangular parallelepiped.

[0103] In order to improve the sealing performance after the first part 101 and the second part 102 are connected, a sealing member such as a sealant or a seal ring may be installed between the first part 101 and the second part 102.

[0104] A battery cell includes an electrode assembly and an electrolyte, and the electrode assembly is composed of a positive electrode sheet, a negative electrode sheet, and a separator. The battery cell operates primarily through 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 is coated on the surface of the positive electrode current collector, and the current collector without the positive electrode active material layer protrudes from the current collector with the positive electrode active material layer coated thereon, and the current collector without the positive electrode active material layer is called a positive electrode tab. For example, in a lithium-ion battery, the positive electrode current collector may be made of aluminum, and the positive electrode active material may be lithium cobalt oxide, lithium iron phosphate, ternary lithium, 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 being coated on the surface of the negative electrode current collector, the portion of the current collector not coated with the negative electrode active material layer protruding from the current collector coated with the negative electrode active material layer, and the portion of the current collector not coated with the negative electrode active material layer being the negative electrode tab. The material of the negative electrode current collector may be copper, and the negative electrode active material may be carbon, silicon, or the like. To ensure that melting does not occur due to a large current, multiple positive electrode tabs are stacked together, and multiple negative electrode tabs are stacked together.

[0105] The type of the separator is not particularly limited, and any known porous separator having electrical and chemical stability can be selected, for example, glass fiber, nonwoven fabric, or a single-layer or multi-layer film of one or more of polyethylene, polypropylene, and polyvinylidene fluoride. The separator may be made of polypropylene (PP), polyethylene (PE), or the like. The electrode assembly may have a wound structure or a laminated structure, and the present application is not limited thereto.

[0106] The electrolyte solution includes an organic solvent and an electrolyte salt, the electrolyte salt transporting ions between the positive and negative electrodes, and the organic solvent acting as a medium for transporting ions. The electrolyte salt may be any electrolyte salt known in the art for use in battery cell electrolytes, such as LiPF6 (lithium hexafluorophosphate), LiBF4 (lithium tetrafluoroborate), LiClO4 (lithium perchlorate), LiAsF6 (lithium hexafluoroarsenate), LiFSI (lithium bisfluorosulfonylimide), LiTFSI (lithium bistrifluoromethanesulfonylimide), LiTFS (lithium trifluoromethanesulfonate), LiDFOB (lithium difluorophosphate), LiBOB (lithium difluorooxalatoborate), LiPO2F2 (lithium bisoxalatoborate), LiDFOP (lithium difluorooxalatophosphate), and LiTFOP (lithium tetrafluorooxalatophosphate). The organic solvent may be any organic solvent known in the art for use in battery cell electrolytes, such as ethylene carbonate. The electrolyte salt and organic solvent may be one or more, preferably two or more, of the following: ethylenediaminetetraacetic acid (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). Appropriate electrolyte salts and organic solvents may be selected according to actual requirements.

[0107] Of course, the battery cell may not contain electrolyte.

[0108] To meet different power demands, a battery can include multiple battery cells, and the multiple battery cells can be connected in series, parallel, or series-parallel, with the series-parallel connection referring to a mixture of series and parallel connections. Alternatively, multiple battery cells can first be connected in series, parallel, or series-parallel to form a battery module, and multiple battery modules can then be connected in series, parallel, or series-parallel to form a battery. That is, multiple battery cells can directly form a battery, or can first form a battery module or battery group, and then the battery module can form a battery. The battery can then be installed in a power consumption device to supply electrical energy to the power consumption device.

[0109] The development of battery technology requires simultaneous consideration of various design factors, such as energy density, cycle life, discharge capacity, charge / discharge ratio, and safety. In particular, when the internal space of a battery is constant, improving the internal space utilization rate is an effective way to improve the battery's energy density. However, while improving the internal space utilization rate, other parameters such as the battery's heat conduction and thermal management must also be considered. Furthermore, improving the internal space utilization rate of a battery can reduce the battery's structural strength. For example, a battery typically has beams inside the housing for mounting battery modules, and the battery modules in the battery are also provided with side plates and end plates. The beams, side plates, and end plates occupy the internal space of the battery while securing the battery. However, without the beams, side plates, and end plates, the battery's structural strength is insufficient, affecting battery performance.

[0110] During battery charging and discharging, a large amount of heat is generated. Especially during fast charging, battery cells generate a large amount of heat, which continuously accumulates and concentrates, causing the battery temperature to rise rapidly. If the heat from the battery cells is not released immediately, it may cause thermal runaway in the battery, resulting in safety hazards such as smoke, fire, and explosion. At the same time, severe temperature unevenness over a long period of time significantly reduces the battery's service life. Furthermore, low temperatures can lead to poor battery discharge efficiency, and even lower temperatures can make starting difficult, affecting the battery's normal operation. Therefore, ensuring the thermal management requirements for batteries is extremely important.

[0111] In view of this, the embodiments of the present application provide a technical solution, in which at least two battery cells are installed in an accommodating cavity of a housing within a battery, and a reinforcing element is connected to the at least two battery cells, and the reinforcing element is installed to be thermally connected to first walls of the at least two battery cells, thereby serving to conduct heat between the battery cells. This eliminates the need to install an additional structure such as a beam in the center of the battery housing, and eliminates the need to install side panels within the battery, thereby maximizing the space utilization rate within the battery and improving the energy density of the battery. At the same time, the reinforcing element can be used to ensure heat conduction within the battery. Therefore, the technical solution of the embodiments of the present application can improve the energy density of the battery, while also ensuring heat conduction within the battery, thereby improving battery performance.

[0112] The technical solutions described in the embodiments of the present application are applicable to various devices that use batteries, such as mobile phones, mobile devices, laptops, electric cars, electric toys, electric tools, electric vehicles, ships and spacecraft, etc., and spacecraft include aircraft, rockets, space shuttles and spaceships, etc.

[0113] It should be noted that the technical solutions described in the embodiments of the present application are not only applicable to the above-mentioned devices, but also to all devices that use batteries. However, for the sake of simplicity, the following embodiments will be described using electric vehicles as examples.

[0114] For example, FIG. 1 shows a structural schematic diagram of a vehicle 1000 according to an embodiment of the present application. The vehicle 1000 may be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. The new energy vehicle may be a pure electric vehicle, a hybrid vehicle, a range-extender vehicle, etc. A motor 101, a controller 102, and a battery 100 may be installed inside the vehicle 1000. The controller 102 is used to control the battery 100 and supply power to the motor 101. For example, the battery 100 may be installed at the bottom, front, or rear of the vehicle 1000. The battery 100 is used to supply power to the vehicle 1000. For example, the battery 100 may be used as an operating power source for the vehicle 1000 and for the circuit system of the vehicle 1000, for example, to meet the operating power needs for starting, navigation, and driving the vehicle 1000. In another embodiment of the present application, 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, replacing or partially replacing fuel or natural gas.

[0115] To meet various power usage demands, the battery 100 may include one or more battery cells 20. For example, Figures 2 and 3 show structural schematic diagrams of a battery 100 according to an embodiment of the present application, in which the battery 100 may include multiple battery cells 20. The battery 100 may further include a housing 10, the interior of which has a hollow structure, and the multiple battery cells 20 are housed within the housing 10. For example, the multiple battery cells 20 may be combined in parallel, series, or series-parallel connection with each other and then placed within the housing 10.

[0116] Optionally, the battery 100 may further include other structures, the description of which will be omitted here. For example, the battery 100 may further include a bus member (not shown), which is used to realize electrical connections between the multiple battery cells 20, such as parallel connections, series connections, 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. Electrical energy from the multiple battery cells 20 may further be extracted through the housing via a conductive mechanism. Optionally, the conductive mechanism may belong to the bus member.

[0117] The number of battery cells 20 can be set to any number according to different power demands, for example, there can be only one battery cell 20. Multiple battery cells 20 can be connected in series, parallel, or series-parallel connection to achieve greater capacity or output. Because each battery 100 includes a large number of battery cells 20, the battery cells 20 can be installed in groups for ease of 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 can include multiple battery modules, and these battery modules can be connected in series, parallel, or series.

[0118] 4 shows a structural schematic diagram of a battery cell 20 according to one embodiment of the present application. The battery cell 20 includes one or more electrode assemblies 22, a housing 211, and a cover plate 212. The housing 211 and the cover plate 212 form an outer case or battery case 21 of the battery cell 20. The walls of the housing 211 and the cover plate 212 are both referred to as walls of the battery cell 20. In 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 of the battery cell 20 after assembling one or more electrode assemblies 22. For example, the housing 211 may be a hollow rectangular parallelepiped, cube, or cylinder, and one side of the housing 211 may have an opening. One or more electrode assemblies 22 can be disposed within the housing 211. The cover plate 212 covers the opening of the housing 211 to isolate the internal environment of the battery cell 20 from the external environment. For example, if the housing 211 is a hollow rectangular parallelepiped or cube, one plane of the housing 211 is an open surface, and this plane has no walls, allowing communication between the inside and outside of the housing 211. The housing 211 may be a hollow cylinder, in which case an end surface of the housing 211 is an open surface, i.e., this end surface has no walls, allowing communication between the inside and outside of the housing 211. The cover plate 212 covers the opening and is connected to the housing 211 to form a sealed cavity in which the electrode assembly 22 is disposed. The housing 211 is filled with an electrolyte, for example, an electrolyte solution.

[0119] The battery cell 20 may further include two electrode terminals 214 mounted on the cover plate 212. The cover plate 212 is generally flat, and the two electrode terminals 214 are fixed to the flat surface of the cover plate 212, and are a positive terminal 214a and a negative terminal 214b, respectively. A connecting member 23 (also referred to as a current collecting member) is mounted corresponding to each electrode terminal 214, and the connecting member 23 is located between the cover plate 212 and the electrode assembly 22 and is used to electrically connect the electrode assembly 22 and the electrode terminals 214.

[0120] As shown in FIG. 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 a positive electrode tab, the second tab 222a is a 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.

[0121] In the battery cell 20, one or more electrode assemblies 22 can be installed according to the requirements of actual use, and FIG. 4 shows that four independent electrode assemblies 22 are installed in the battery cell 20.

[0122] The battery cell 20 may further be provided with a pressure reducing mechanism 213. The pressure reducing mechanism 213 is used to operate and release the internal pressure or temperature when the internal pressure or temperature of the battery cell 20 reaches a threshold value.

[0123] The pressure reducing mechanism 213 may have various possible pressure reducing structures, but embodiments of the present application are not limited thereto. For example, the pressure reducing mechanism 213 may be a temperature-sensitive pressure reducing mechanism configured to melt when the internal temperature of the battery cell 20 in which the pressure reducing mechanism 213 is installed reaches a threshold, and / or the pressure reducing mechanism 213 may be a pressure-sensitive pressure reducing mechanism configured to burst when the internal air pressure of the battery cell 20 in which the pressure reducing mechanism 213 is installed reaches a threshold.

[0124] FIG. 10 shows a schematic diagram of the structure of a battery 100 according to one embodiment of the present invention.

[0125] 10 , the battery 100 includes a housing 10, at least two battery cells 20, and a reinforcing element 30. The housing 10 has a receiving cavity 10a. The at least two battery cells 20 are received in the receiving cavity 10a. Each battery cell 20 includes an electrode assembly 22 and an electrode terminal 214. The electrode assembly 22 is electrically connected to the electrode terminal 214, so that the battery cells 20 can supply electrical energy. The battery cell 20 also includes a first wall 201. The first wall 201 is the wall with the largest area of ​​the battery cell 20 and can be understood as the “large surface” of the battery cell 20. The reinforcing element 30 is connected to the at least two battery cells 20, and the reinforcing element 30 is thermally connected to the first walls 201 of the at least two battery cells 20.

[0126] Therefore, when each battery cell 20 is connected to the reinforcing element 30, the at least two battery cells 20 may be connected together via the reinforcing element 30. In this case, side panels and additional structures such as beams are not required inside the battery 100, which can significantly improve the space utilization rate within the battery 100 and increase the energy density of the battery 100. In addition, a large surface of the battery cell 20, i.e., the first wall 201, is thermally connected to the reinforcing element 30, allowing heat exchange between the reinforcing element 30 and the at least two battery cells 20 and a large heat exchange area between the reinforcing element 30 and the battery cells 20. This effectively utilizes the reinforcing element 30 to conduct heat from the at least two battery cells 20 and ensures that the temperature of the battery cells 20 is normal, thereby improving the service life and safety performance of the battery cells 20. When thermal runaway occurs in a certain battery cell 20, the heat generated from the thermal runaway battery cell 20 is taken by the reinforcing element 30 which exchanges heat with the thermal runaway battery cell 20, the temperature of the thermal runaway battery cell 20 drops, and the problem of adjacent battery cells 20 also experiencing thermal runaway is avoided, thereby ensuring the safety performance of the battery cells 20.

[0127] For example, if the temperature of the battery cell 20 is too high, the reinforcing element 30 may cool the battery cell 20 to lower the temperature of the battery cell 20. If the temperature of the battery cell 20 is too low, the reinforcing element 30 may heat the battery cell 20 to raise the temperature of the battery cell 20.

[0128] Exemplarily, the battery 100 includes a plurality of battery cells 20, and the plurality of battery cells 20 are arranged along the second direction y, i.e., the second direction y is the arrangement direction of the plurality of battery cells 20 in a row of the battery 100. That is, the rows of the battery cells 20 in the battery 100 are 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 may be 2 to 20, but the embodiment of the present application is not limited thereto. The reinforcing element 30 extends along the second direction y, and the reinforcing element 30 and the first wall 201 of each battery cell 20 in the plurality of battery cells 20 are thermally connected, and the first wall 201 of the battery cell 20 may face the reinforcing element 30, i.e., the first wall 201 of the battery cell 20 may be parallel to the second direction y.

[0129] Optionally, the reinforcing element 30 may be fixedly connected to the first wall 201. 3 0 and the battery cell 20, and ensures a reliable connection between the battery cell 20 and the reinforcing element 30. Of course, the reinforcing element 30 can also be fixedly connected to other walls of the battery cell 20, but is not limited to the first wall 201.

[0130] Alternatively, the first wall 201 may be in direct contact with the reinforcing element 30, thereby realizing heat transfer between the battery cell 20 and the reinforcing element 30, or the first wall 201 may be in indirect contact with the reinforcing element 30, for example, the first wall 201 may be in contact with the reinforcing element 30 via a heat-conducting member such as a heat-conducting adhesive, thereby similarly realizing heat transfer between the battery cell 20 and the reinforcing element 30. Obviously, the fact that the reinforcing element 30 is thermally connected to the first wall 201 means that heat exchange can occur between the first wall 201 and the reinforcing element 30, ensuring the thermal management ability of the reinforcing element 30 for the battery cell 20.

[0131] 4 to 6 , in some embodiments, each battery cell 20 further includes a second wall 202 connected to the first wall 201. The first wall 201 is disposed so as to intersect with the second wall 202, so that the first wall 201 and the second wall 202 are not parallel to each other and share a common line. The electrode terminal 214 is disposed on the second wall 202, and is disposed on a wall of the battery cell 20 other than the first wall 201 that intersects with the first wall 201. This facilitates the installation of the electrode terminal 214 and simultaneously provides clearance for the electrode terminal 214 and the reinforcing element 30. This eliminates the need to provide a clearance portion on the reinforcing element 30 for the electrode terminal 214, which is advantageous in simplifying the structure of the reinforcing element 30.

[0132] For example, as illustrated in FIGS. 4 and 5 , the battery cell 20 forms an approximately rectangular parallelepiped structure, and the length of the battery cell 20 is greater than the width and height of the battery cell 20, the first wall 201 is located on one side of the battery cell 20 in the first direction x, and the battery cell 20 has a second wall 202 on at least one of two sides thereof in the second direction y, and the battery cell 20 has the second wall 202 on at least one of two sides thereof in the third direction z, and the electrode terminal 214 may be provided on the second wall 202 of the battery cell 20 in the third direction z, and naturally, the electrode terminal 214 may be provided on the second wall 202 of the battery cell 20 in the second direction y, as shown in FIG. 6 .

[0133] Alternatively, in the example shown in FIG. 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 third 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 when the electrode terminal 214 is provided on the second wall 202, the electrode terminal 214 may be located at one end or both ends of the battery cell 20 in the length direction, and / or the electrode terminal 214 is located at one end or both ends of the battery cell 20 in the width direction.

[0134] Of course, in the present application, the installation position of the electrode terminal 214 is not limited to this. As shown in Figures 7 and 8, the electrode terminal 214 may be provided on the first wall 201, and the arrangement of the electrode terminal 214 is similarly easy, for example, if 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 application has high flexibility in terms of the installation position of the electrode terminal.

[0135] In some embodiments, as shown in FIG. very The terminal 214 may be provided on the first wall 201, and at least two battery cells 20 are arranged in a first direction x. In the first direction x, each battery cell 20 has a first surface 203 facing the first wall 201. have The first surface 203 is provided with an escape groove 203a, and the escape groove 203a of one of two adjacent battery cells 20 is used to accommodate the electrode terminal 214 of the other battery cell 20. The first direction x is perpendicular to the first wall 201, thereby enabling the multiple battery cells 20 to be compactly arranged in the first direction and saving space.

[0136] In some embodiments, as shown in FIGS. 4 to 6 , the electrode terminals 214 are provided on the second wall 202, each battery cell 20 includes two first walls 201 arranged opposite to each other and two second walls 202 arranged opposite to each other, at least two electrode terminals 214 are provided, and the multiple electrode terminals 214 include a positive electrode terminal 214a and a negative electrode terminal 214b.

[0137] Here, at least two electrode terminals 214 are installed on the same second wall 202, which is advantageous for saving the space occupied by the battery cell 20, provided that adjacent electrode terminals 214 are spaced apart appropriately. Alternatively, at least one electrode terminal 214 is installed on each second wall 202, which ensures that electrode terminals 214 located on different second walls 202 are spaced apart adequately.

[0138] For example, in the examples of Figures 4 and 5, the battery cell 20 includes two first walls 201 arranged opposite each other along a first direction x and two second walls 202 arranged opposite each other along a third direction z, where the third direction z is not parallel to the first direction x, for example, the third direction z is perpendicular to the first direction x, and all of the multiple electrode terminals 214 are located on the same second wall 202 of the battery cell 20 in the third direction z.

[0139] Of course, in a rectangular parallelepiped-shaped battery cell 20, the battery cell 20 may include two second walls 202 arranged opposite each other along the second direction y, where the second direction y is not parallel to the first direction x, for example, the second direction y is perpendicular to the first direction x, and the multiple electrode terminals 214 are all located on the same second wall 202 in the second direction y of the battery cell 20.

[0140] Whether the multiple electrode terminals 214 are located on one side of the battery cell 20 in the second direction y or on one side of the battery cell 20 in the third direction z, when there are multiple battery cells 20 and the multiple battery cells 20 are arranged in sequence along the second direction y, the second walls 202 of two adjacent battery cells 20 face each other in the second direction y.

[0141] In the present application, the first wall 201 may be a flat or curved surface, and the second wall 202 may be a flat or curved surface.

[0142] In some embodiments, as shown in FIG. 9, the first wall 201 may be formed in a cylindrical shape, and the battery cell 20 may then be a substantially cylindrical battery cell.

[0143] 9 , when second walls 202 are provided on both axial ends of the first wall 201 and electrode terminals 214 are provided on at least one of the second walls 202, all of the electrode terminals 214 of the battery cells 20 are provided on one of the second walls 202, or at least one of the electrode terminals 214 of the battery cells 20 are provided on one of the second walls 202, and the remaining electrode terminals 214 of the battery cells 20 are provided on the other second wall 202. This allows flexible arrangement of the electrode terminals 214.

[0144] In some embodiments, as shown in FIG. 9 , one of the second walls 202 is provided with an exposed electrode terminal 214, and the electrode assembly 22 includes a positive electrode sheet 221 and a negative electrode sheet 222, one of which is electrically connected to the electrode terminal 214 and the other of which is electrically connected to the first wall 201, thereby realizing normal power supply to the battery cell 20.

[0145] 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, that is, the second wall 202 provided with the exposed electrode terminal 214 is different from the second wall 202 electrically connected to the other of the positive electrode sheet 221 and the negative electrode sheet 222, and similarly realizes normal power supply to the battery cell 20.

[0146] In some embodiments, at least one battery cell 20 is a soft-pack battery cell, and when the battery 100 includes one battery cell 20, the battery cell 20 is a soft-pack battery cell, and when the battery 100 includes multiple battery cells 20, at least one of the multiple battery cells 20 is a soft-pack battery cell. This increases the variety, structure, and layout of the battery 100, which is advantageous for meeting the needs of differentiating the applications of the battery 100.

[0147] In some embodiments, as shown in FIGS. 4 and 5 , the battery cell 20 further includes a pressure reducing mechanism 213, and the pressure reducing mechanism 213 and the electrode terminal 214 are installed on the same wall of the battery cell 20, for example, the pressure reducing mechanism 213 and the electrode terminal 214 are both installed on the second wall 202.

[0148] Of course, in other embodiments of the present application, the battery cell 20 further includes a pressure reducing mechanism 213, and the pressure reducing mechanism 213 and the electrode terminal 214 are respectively installed on the two walls of the battery cell 20.

[0149] This allows the pressure reducing mechanism 213 to have a certain degree of flexibility with respect to the position of the electrode terminal 214 .

[0150] In some embodiments, the reinforcing element 30 is adhered to the first walls 201 of at least two battery cells 20 via a first adhesive layer, and the adhesion of the reinforcing element 30 to the first walls 201 achieves a reliable and stable connection between the reinforcing element 30 and the battery cells 20, ensuring that the entire battery 100 has a certain rigidity and strength, while at the same time reducing consumables and the overall weight, helping to realize a lightweight design of the battery 100, and making the structure simpler, more compact, and easier to process and assemble.

[0151] Optionally, the first adhesive layer may include a thermally conductive structural adhesive, which not only has good adhesive properties but also has properties such as heat conduction, deterioration resistance, fatigue resistance, and corrosion resistance, which can improve the connection strength and thermal management efficiency between the battery cells 20 and the reinforcing element 30, and facilitate faster heat transfer between the battery cells 20 and the reinforcing element 30. Of course, the first adhesive layer may also include double-sided tape, etc.

[0152] It should be noted that the reinforcing element 30 and the first wall 201 may be connected by other methods such as riveting or welding, and the present application is not limited thereto.

[0153] In some embodiments, the bottom of the reinforcing element 30 is glued to the bottom wall of the receiving cavity 10a via a second adhesive layer, and the adhesion between the bottom of the reinforcing element 30 and the bottom wall of the receiving cavity 10a achieves a fixed connection between the reinforcing element 30 and the bottom wall of the receiving cavity 10a, resulting in a simple structure and easy processing and assembly. In this case, the reinforcing element 30 is glued to the first wall 201 and the bottom wall of the receiving cavity 10a, respectively, ensuring a secure installation of the reinforcing element 30.

[0154] In some embodiments, the bottom of the battery cell 20 is adhered to the bottom wall of the receiving cavity 10a via a third adhesive layer, and the bottom of the battery cell 20 is adhered to the bottom wall of the receiving cavity 10a, thereby realizing a fixed connection between the battery cell 20 and the bottom wall of the receiving cavity 10a. The structure is simple, and processing and assembly are easy. In this case, the reinforcing element 30 is adhesively fixed to the first wall 201, and the battery cell 20 is adhesively fixed to the bottom wall of the receiving cavity 10a, so that the reinforcing element 30 is indirectly fixed to the bottom wall of the receiving cavity 10a via the battery cell 20.

[0155] In some embodiments, the bottom of the reinforcing element 30 is adhered to the bottom wall of the receiving cavity 10a via a second adhesive layer, and the bottom of the battery cell 20 is adhered to the bottom wall of the receiving cavity 10a via a third adhesive layer.

[0156] In some embodiments, at least a portion of the heat of the battery cell 20 can be transferred to the reinforcing element 30 through the first adhesive layer, and the thickness of the first adhesive layer is equal to or less than the thickness of the second adhesive layer, which is advantageous in reducing the thermal resistance in the heat conduction between the battery cell 20 and the reinforcing element 30 and ensuring the efficiency of the heat conduction between the battery cell 20 and the reinforcing element 30, while ensuring a reliable connection between the battery cell 20 and the reinforcing element 30 and the bottom wall of the receiving cavity 10a.

[0157] In some embodiments, the thickness of the first adhesive layer is equal to or less than the thickness of the third adhesive layer, which not only ensures a secure connection between the battery cell 20 and the reinforcing element 30 and the bottom wall of the receiving cavity 10a, but also is advantageous in reducing the thermal resistance in heat conduction between the battery cell 20 and the reinforcing element 30, thereby ensuring efficient heat conduction between the battery cell 20 and the reinforcing element 30.

[0158] In some embodiments, the thickness of the first adhesive layer is equal to or less than the thickness of the second adhesive layer, and the thickness of the first adhesive layer is equal to or less than 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 possible to ensure that the adhesive is distributed and utilized rationally, and to ensure that the battery cells 20 and the reinforcing elements 30 are securely installed in the receiving cavities 10a.

[0159] In some embodiments, the thermal conductivity of the first adhesive layer is equal to or greater than the thermal conductivity of the second adhesive layer, and at least a portion of the heat from the battery cells 20 can be transferred to the reinforcing element 30 through the first adhesive layer. This is beneficial to reducing the thermal resistance in the heat conduction between the battery cells 20 and the reinforcing element 30, and ensuring efficient heat conduction between the battery cells 20 and the reinforcing element 30, while ensuring a reliable connection between the battery cells 20 and the reinforcing element 30 and the bottom wall of the receiving cavity 10a.

[0160] In some embodiments, the thermal conductivity of the first adhesive layer is equal to or greater than the thermal conductivity of the third adhesive layer, which is advantageous in reducing the thermal resistance in the heat conduction between the battery cell 20 and the reinforcing element 30, while ensuring a reliable connection between the battery cell 20 and the reinforcing element 30 and the bottom wall of the receiving cavity 10a. 0 This ensures efficient heat transfer between the

[0161] Of course, some of the heat from the battery cell 20 can be transferred to the bottom wall of the receiving cavity 10a through the third adhesive layer and released.

[0162] In some embodiments, the thermal conductivity of the first adhesive layer is greater than or equal to the thermal conductivity of the second adhesive layer, and the thermal conductivity of the first adhesive layer is greater than or equal to the thermal conductivity of the second adhesive layer. 3 The thermal conductivity of the adhesive layer is equal to or greater than that of the adhesive layer, thereby realizing rational distribution and utilization of the adhesive, ensuring stable installation of the battery cells 20 and the reinforcing elements 30, and at the same time ensuring rapid dissipation of heat from the battery cells 20.

[0163] 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, and the ratio between the thickness of the third adhesive layer and the thermal conductivity of the third adhesive layer is a third ratio.

[0164] Here, the first ratio is equal to or less than the second ratio, and / or the first ratio is equal to or less than the third ratio, thereby ensuring the heat exchange effect of the battery cells 20 and making efficient and rational use of the adhesive, and realizing rational distribution of the adhesive.

[0165] 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.

[0166] In some embodiments, the battery 100 includes a plurality of battery modules 100a, each of which includes at least one row of battery groups 20A and at least one reinforcing element 30. The battery group 20A includes a plurality of battery cells 20 arranged in a row along a second direction y, and the first walls 201 of each battery cell 20 in the battery group 20A are fixed to and thermally connected to the reinforcing element 30. There may be a plurality of battery groups 20A and a plurality of reinforcing elements 30, and the plurality of battery groups 20A and the plurality of reinforcing elements 30 may be arranged alternately along a first direction x, which is perpendicular to the first walls 201.

[0167] Alternatively, the battery module 100a may include N battery groups 20A and N-1 reinforcing elements 30, each reinforcing element 30 being disposed between two adjacent battery groups 20A, where N is an integer greater than 1. For example, assume that N is 2. The battery modules 100a are arranged along the first direction x, with a gap between each adjacent battery module 100a. Of course, the reinforcing elements 30 may be disposed between the battery groups 20A and the inner wall of the housing 10.

[0168] In some embodiments, a row of battery cells 20 arranged along the second direction y may be connected to the reinforcing element 30 on only one side in the first direction x, or on both sides in the first direction x, and the embodiments of the present application are not limited thereto.

[0169] In some embodiments, the reinforcing element 30 is a thermal conduction member 3a, which is used to exchange heat with the battery cell 20, ensuring the efficiency of heat conduction of the reinforcing element 30 and ensuring that the battery cell 20 has an appropriate temperature. Of course, the reinforcing element 30 can also be a thermal management member 3b, which is also used to exchange heat with the battery cell 20, ensuring that the battery cell 20 has an appropriate temperature.

[0170] In this application, the heat conduction member 3a may also be referred to as the heat management member 3b, and naturally, the heat conduction member 3a may also be referred to as the partition plate 33 having the function of heat conduction and heat exchange with the battery cells 20, as will be described later.

[0171] In some embodiments, the thermal conductive member 3a includes a metal material and / or a non-metal material, which allows the thermal conductive member 3a to be flexibly selected and installed. In addition to having good thermal conductivity, the thermal conductive member 3a also has other excellent properties, which can better meet the needs of differentiated applications.

[0172] 10 to 13, in some embodiments, the thermally conductive member 3a includes a metal plate 31 and an insulating layer 32, and the insulating layer 32 is disposed on the surface of the metal plate 31. By disposing the thermally conductive member 3a in this manner, the metal plate 31 can ensure the strength of the thermally conductive member 3a, and the insulating layer 32 can turn the surface of the thermally conductive member 3a connected to the first wall 201 into an insulating surface, thereby preventing electrical connection between the metal plate 31 and the battery cell 20 and ensuring electrical insulation in the battery 100.

[0173] Alternatively, the insulating layer 32 may be an insulating film adhered to the surface of the metal plate 31 , or may be an insulating paint applied to the surface of the metal plate 31 .

[0174] In some embodiments, the heat conducting member 3a is a plate of a non-metallic material, i.e., the entire heat conducting member 3a is a non-metallic insulating material. Of course, in such embodiments, only a portion of the heat conducting member 3a is made of a non-metallic material.

[0175] In some embodiments, as shown in Fig. 12, a cavity 30a is provided inside the thermally conductive member 3a. The cavity 30a is used, for example, when the thermally conductive member 3a is thick, to ensure the strength of the thermally conductive member 3a while reducing the weight of the thermally conductive member 3a. The cavity 30a also allows the thermally conductive member 3a to have a large compression space in a direction perpendicular to the first wall 201 (e.g., the first direction x), thereby providing a large expansion space for the battery cells 20.

[0176] Optionally, the cavity 30 a is used to contain a fluid to regulate the temperature of the at least two battery cells 20 .

[0177] The fluid, which is the heat exchange medium, may be liquid or gas, and adjusting the temperature refers to heating or cooling one or more battery cells 20. When cooling the battery cells 20, the cavity 30a may contain a cooling medium for adjusting the temperature of one or more battery cells 20. In this case, the fluid may be referred to as a cooling medium or cooling fluid, or more specifically, as a coolant or cooling gas. The fluid may also be used for heating, although the present invention is not limited thereto. Optionally, the fluid may be circulated to achieve a better temperature adjustment effect. Optionally, the fluid may be water, a mixture of water and ethylene glycol, heat transfer oil, refrigerant, air, or the like.

[0178] In some embodiments, as shown in Figures 14, 15 and 30, there are multiple battery cells 20, and the multiple battery cells 20 are arranged along the second direction y, the reinforcing element 30 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.

[0179] As a result, the first walls 201 of each battery cell 20, which have the largest surface area, are all connected to the partition plates 33, and the multiple battery cells 20 are connected together via the partition plates 33. This eliminates the need to install side panels within the battery 100, and eliminates the need to install additional structures such as beams. This significantly improves the space utilization rate within the battery 100, and improves the energy density of the battery 100.

[0180] As batteries are used, the blue film on the surface of the battery cells is easily damaged, and if the blue film is damaged, poor insulation occurs between adjacent battery cells and between the battery cell and the housing, increasing the risk of the battery short-circuiting. Furthermore, to regulate the temperature of the battery cells, water-filled cooling or heating plates are installed between adjacent battery cells, but the surfaces of the water-filled cooling or heating plates lack insulation protection, and water vapor inside the battery is easily liquefied on the surface of the water-filled cooling or heating plate. If the blue film is damaged, the risk of the battery short-circuiting increases even further.

[0181] In consideration of the above, in order to alleviate the problem of the battery being short-circuited due to damage to the blue film, the inventors have conducted extensive research and have found that the reinforcing element 30 further includes an insulating layer 32, which is used to insulate and isolate the first wall 201 of the battery cell 20 from the partition plate 33.

[0182] The insulating layer 32 is installed on the surface of the partition plate 33 and is not susceptible to damage caused by expansion of the battery cell's outer shape or self-heating. If the battery cell's surface does not have an insulating structure or the blue film on the battery cell's surface 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 will provide insulation between the battery cell 20 and the partition plate 33, effectively alleviating the problem of the battery 100 short-circuiting caused by the blue film of the battery cell 20 being damaged or water vapor liquefying on the surface of the partition plate 33, thereby reducing the risk of the battery 100 short-circuiting and improving the safety of power usage in the power consumption device.

[0183] The insulating layer 32 is connected to the surface of the partition plate 33, so that the insulating layer 32 can cover a part of the surface of the partition plate 33 or the entire surface.

[0184] In some embodiments, the partition plate 33 is a thermal management member 3b, which is used to exchange heat with the battery cells 20. The thermal management member 3b is a structure that exchanges heat with the battery cells 20, and may be a resistance heating wire, a thermally conductive member through which a heat exchange medium passes, or a material that undergoes a chemical reaction and changes temperature in response to changes in the surrounding environment. Heat exchange with the battery cells 20 is achieved by the temperature change of the thermal management member 3b itself. In this case, when the temperature of the thermal management member 3b is lower than that of the battery cells 20, the thermal management member 3b cools the battery cells 20, preventing thermal runaway due to excessively high temperatures in the battery cells 20. When the temperature of the thermal management member 3b is higher than that of the battery cells 20, the thermal management member 3b heats the battery cells 20, ensuring normal operation of the battery 100.

[0185] The thermal management member 3b may have a structure capable of containing a fluid medium, and heat is transferred between the battery cells 20 and the fluid medium via the thermal management member 3b and the insulating layer 32, thereby realizing heat exchange between the battery cells 20 and the fluid medium. The fluid medium may be a liquid (e.g., water) or a gas (e.g., air). In this case, when the temperature of the fluid medium contained in the thermal management member 3b is lower than that of the battery cells 20, the thermal management member 3b cools the battery cells 20, thereby preventing thermal runaway of the battery cells 20 due to excessive temperature. When the temperature of the fluid medium contained in the thermal management member 3b is higher than that of the battery cells 20, the thermal management member 3b heats the battery cells 20, thereby ensuring normal operation of the battery 100.

[0186] Alternatively, the thermal management member 3 b may be installed on one side of the battery cell 20 and positioned between the battery cell 20 and the housing 10 , or may be provided between two adjacent battery cells 20 .

[0187] In some embodiments, the insulating layer 32 may only insulate the battery cells 20 from the partition plate 33. In other embodiments, the insulating layer 32 may not only insulate the battery cells 20 from the partition plate 33, but also insulate the partition plate 33 from the inner wall of the housing 10, further reducing the risk of the battery 100 shorting out, thereby further improving the safety of the battery 100.

[0188] For example, a plurality of battery cells 20 are stacked and arranged along the first direction x, a partition plate 33 is installed between two adjacent battery cells 20, and an insulating layer 32 is provided on each of the opposing sides of the partition plate 33, and each battery cell 20 in the two adjacent battery cells 20 and the partition plate 33 are insulated and isolated by the insulating layer 32.

[0189] Also, for example, along the stacking direction of the plurality of battery cells 20, 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, and 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 not only insulates and isolates the battery cells 20 and the partition plate 33, but also insulates and isolates the partition plate 33 and the inner wall of the housing 10, further reducing the risk of the battery 100 short-circuiting and thereby further improving the safety of the battery 100.

[0190] In some embodiments, the thermal conductivity λ of the insulating layer 32 is 0.1 W / (m·K) or more, and the insulating layer 32 has good thermal conductivity, so that the insulating layer 32 can perform the function of heat transfer, have good thermal conductivity ability between the battery cells 20 and the partition plate 33, improve the heat exchange efficiency between the battery cells 20 and the partition plate 33, and effectively ensure that the battery cells 20 have an appropriate temperature, for example, when the partition plate 33 is the thermal management member 3b.

[0191] Thermal conductivity is the heat transferred through an area of ​​1 square meter in 1 hour under stable heat conduction conditions when the temperature difference between the two sides of a 1m thick material is 1 degree (K, °C), and its unit is Watts / meter·degree (W / (m·K), where K can be replaced with °C).

[0192] In some embodiments, the density of the insulating layer 32 is G≦1.5 g / cm 3 is.

[0193] When the insulating layer 32 is provided 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 smaller the mass of the insulating layer 32. The higher the density of the insulating layer 32, the larger the mass of the insulating layer 32. The density of the insulating layer 32 is G≦1.5 g / cm 3 Therefore, the weight of the insulating layer 32 is small, which reduces the weight of the battery 100, reducing the impact of providing the insulating layer 32 on the weight of the battery 100 and is advantageous for reducing the weight of the battery 100.

[0194] In some embodiments, the compressive strength P of the insulating layer 32 satisfies 0.01 MPa≦P≦200 MPa, providing the insulating layer 32 with a certain elasticity. When the battery cells 20 expand and deform, the insulating layer 32 deforms itself, thereby reducing the impact on the entire battery 100. Alternatively, when the battery 100 is subjected to an impact, the elastic insulating layer 32 deforms itself, thereby providing a cushioning effect, thereby providing a certain protection for the battery cells 20 and improving the safety of the battery 100.

[0195] Compressive strength refers to the maximum compressive stress that a sample can undergo before breaking or yielding in a compression test.

[0196] 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.

[0197] The material of the insulating layer 32 may include only one of polyethylene terephthalate, polyimide, and polycarbonate. In another embodiment, the material of the insulating layer 32 may include two or three of polyethylene terephthalate, polyimide, and polycarbonate. For example, the insulating layer 32 includes a first insulating portion and a second insulating portion arranged in a stacked manner, where the first insulating portion is made of polyethylene terephthalate and the second insulating portion is made of polyimide, or the first insulating portion is made of polyimide and the second insulating portion is made of polycarbonate, or the first insulating portion is made of polyethylene terephthalate and the second insulating portion is made of polycarbonate. In some other embodiments, the insulating layer 32 includes a first insulating portion, a second insulating portion, and a third insulating portion arranged in a stacked manner, where the first insulating portion is made of polyethylene terephthalate, the second insulating portion is made of polyimide, and the third insulating portion is made of polycarbonate.

[0198] Polyethylene terephthalate, polyimide, and polycarbonate have advantages such as high impact resistance and excellent resistance to heat degradation. Therefore, when the material of the insulating layer 32 includes at least one of polyethylene terephthalate, polyimide, and polycarbonate, the insulating layer 32 has advantages such as high impact resistance and excellent resistance to heat degradation. 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. When the insulating layer 32 is formed using at least one of these three materials, the insulating layer 32 has good thermal conductivity and improves the heat exchange performance and heat exchange efficiency between the battery cells 20 and the partition plate 33.

[0199] The insulating layer 32 can be connected to the partition plate 33 in many ways. 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 in a coated form. In this case, the insulating layer 32 may or may not be connected to the battery cells 20. The insulating layer 32 is a coating layer applied to the surface of the partition plate 33, which can make the connection between the insulating layer 32 and the partition plate 33 more tight, 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 falling off the partition plate 33.

[0200] 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 bonds 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 be connected to the battery cells 20 via a separate adhesive layer, or may not be connected to the battery cells 20. Connecting the insulating layer 32 and the partition plate 33 via an adhesive layer is a simple connection method.

[0201] Furthermore, in another embodiment, the insulating layer 32 is potted between the partition plate 33 and the battery cells 20. Potting is a process in which a liquid compound is injected into the device by machine or manual means and hardened into a thermosetting polymer insulating material with excellent performance at room temperature or under heated conditions. By installing the insulating layer 32 between the partition plate 33 and the battery cells 20 by potting, the integrity of the entire structure formed by the battery cells 20, the insulating layer 32, and the partition plate 33 can be strengthened, and the ability to resist external shock and vibration can be improved.

[0202] 14 , in some embodiments, 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 occupying too much space inside the battery 100, thereby further improving the space utilization rate inside the battery 100 and improving the energy density of the battery 100.

[0203] In some embodiments, the dimension T1 of the partition plate 33 in the first direction x is 0.05 mm or more, which prevents the dimension of the partition plate 33 in the first direction x from being too small, i.e., the thickness of the partition plate 33 is small, and the rigidity of the partition plate 33 is low, thereby preventing the strength requirements of the battery 100 from being met.

[0204] 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 cells 20, thereby improving the safety of the battery 100. Optionally, 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.

[0205] In some embodiments, the dimension T2 of the insulating layer 32 in the first direction x satisfies 0.01 mm≦T2≦0.3 mm.

[0206] 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 cells 20 and the partition plates 33 from being electrically connected, resulting in poor insulation of the battery 100 and a safety risk. 3 If the dimension T2 in the first direction x of 2 is too large, it will occupy too much 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.

[0207] In the present embodiment, the voltage E of the battery 100 and the dimension T2 of the insulating layer 32 in the first direction x are -3 mm / V≦T2 / E≦3×10 -3 Meets mm / V.

[0208] The insulating effect of the insulating layer 32 is not only related to the thickness of the insulating layer 32, but also to the thickness of the insulating layer 32 corresponding to the unit voltage. If T2 / E is too small, i.e., if the dimension T2 in the first direction x of the insulating layer 32 for the unit voltage is too small, the insulating layer 32 cannot effectively prevent the battery cells 20 and the partition plates 33 from being electrically connected, resulting in poor insulation of the battery 100 and a safety risk. If T2 / E is too large, i.e., if the dimension T2 in the first direction x of the insulating layer 32 for the unit voltage is too large, excessive space inside the battery 100 will be occupied, which is detrimental to improving the energy density of the battery 100. Therefore, the value of T2 / E should be set to 0.01×10 -3 ~3×10 -3 By setting the value to mm / V, not only can the energy density of the battery 100 be improved, but also the safety of the battery 100 can be ensured.

[0209] In some embodiments, the area S1 of the surface of the partition plate 33 connected to the first walls 201 of the multiple battery cells 20 and the total area S2 of the first walls 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 Fig. 15 , H1 is the dimension of the partition plate 33 in the third direction z, 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 z, and L2 is the sum of the dimensions of the multiple battery cells 20 in the second direction y.

[0210] If the value of S1 / S2 is too small, i.e., if the surface area S1 of the partition plate 33 connected to the first walls 201 of the plurality of battery cells 20 is much smaller than the total area S2 of the first walls 201 of the plurality of 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 to meet the strength requirements of the battery 100. If the value of S1 / S2 is too large, i.e., 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 walls 201 of the plurality of battery cells 20 connected to the same side of the partition plate 33, the partition plate 33 will occupy too much space inside the battery 100 compared to the battery cells 20, which is detrimental to improving the energy density of the battery 100. Therefore, the ratio of S1 / S2 Value of By setting the value of the resistance to 0.25 to 4, not only the energy density of the battery 100 can be improved, but also the strength of the battery 100 can be improved.

[0211] In some embodiments, as shown in FIG. 15 , in the third direction z, 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 z is perpendicular to the first direction x and the second direction y.

[0212] If H1 / H2 is too small, i.e., if the dimension H1 of the partition plate 33 in the third direction z 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 will be too small to meet the strength requirements of the battery 100. If H1 / H2 is too large, i.e., if the dimension H1 of the partition plate 33 in the third direction z is much larger than the dimension H2 of the first wall 201 of the battery cell 20, the partition plate 33 will occupy too much space inside the battery 100 compared to the battery cell 20, which will be detrimental to improving the energy density of the battery 100. Therefore, by setting the value of H1 / H2 to 0.2 to 2, the energy density of the battery 100 can be improved and the strength of the battery 100 can also be improved.

[0213] In some embodiments, as shown in FIG. 15, the dimension L1 of the partition plate 33 and the dimension L2 of the plurality of battery cells 20 in the second direction y satisfy 0.5≦L1 / L2≦2.

[0214] If L1 / L2 is too small, i.e., if the dimension L1 of the partition plate 33 in the second direction y 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 to meet the strength requirements of the battery 100. L 1 / L If 2 is too large, i.e., in the second direction y, the dimension of the partition plate 33 L If L1 / L2 is much larger than the dimension L2 of the first wall 201 of the battery cell 20, the partition plate 33 will occupy an excessive amount of space inside the battery 100 compared to the battery cell 20, which will be detrimental to improving the energy density of the battery 100. Therefore, by setting the value of L1 / L2 to 0.5 to 2, not only can the energy density of the battery 100 be improved, but the strength of the battery 100 can also be improved.

[0215] Optionally, 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 to fix the partition plate 33.

[0216] Using the battery cells 20 and partition plate 33 shown in Figure 14, a vibration and impact resistance test was conducted on the partition plate in accordance with GB38031-2020 "Safety Requirements for Power Storage Batteries for Electric Vehicles" standard, 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 z, 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 z, L2 is the sum of the dimensions of multiple battery cells in the second direction y, and S1 = H1 * L1, S2 = H2 * L2.

[0217] [Table 1]

[0218] Using the battery cell 20 and partition plate 33 shown in Figures 14 and 15, the dielectric withstand voltage capability of the partition plate was tested in accordance with IEC 60664-1, with an insulation test of 1000 VDC applied, an insulation resistance value of 500 MΩ or greater, and a withstand voltage test of 2700 VDC applied for 60 seconds, and a leakage current of 1 mA or less. 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.

[0219] [Table 2]

[0220] 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.

[0221] For example, as shown in FIG. 0 0 includes a plurality of battery cells 20 arranged along the second direction Y and a partition plate 33, and the partition plate 33 extends along the second direction Y and is connected to the first wall 201 of each battery cell 20 in the plurality of battery cells 20.

[0222] In some embodiments, the dimension T1 of the partition plate in the first direction x is equal to or less than 100 mm.

[0223] If the dimension T1 of the partition plate in the first direction x is too large, it will occupy too much space inside the battery 100, which is detrimental to improving the energy density of the battery 100. Therefore, the value of T1 should be set to 100 mm or less to effectively improve the energy density of the battery 100.

[0224] In some embodiments, as shown in FIG. 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 the relationship 0.04≦T1 / T3≦2.

[0225] If T1 / T3 is too small, i.e., 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 will have a low ability to absorb deformation and will not be able to accommodate the expansion and deformation of the battery cell 20, reducing the usability of the battery cell 20. If T1 / T3 is too large, i.e., 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 will have a high ability to absorb deformation and will far exceed the expansion and deformation space required by the battery cell 20. This will result in the partition plate 33 occupying too much space inside the battery 10 compared to the battery cell 20, which will be detrimental to improving the energy density of the battery 10. Therefore, by setting the value of T1 / T3 to 0.04 to 2, the energy density of the battery 10 can be improved and the expansion and deformation of the battery cell 20 can be accommodated.

[0226] In some embodiments, an insulating layer 32 is provided 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.

[0227] The insulating layer 32 is provided on the outer surface of the partition plate 33 to prevent the battery cells 20 and the partition plate 33 from being electrically connected, improving the safety of the battery 10. 2 If the dimension T2 of the insulating layer 32 in the first direction x is too small, the insulating layer 32 will not be able to effectively prevent the battery cells 20 and the partition plates 33 from being electrically connected to each other, resulting in poor insulation of the battery 100. If the dimension T2 of the insulating layer 32 in the first direction x is too large, it will occupy too much space inside the battery 100, which is 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 effective insulation between the battery cells 20 and the partition plates 33.

[0228] Optionally, a concentrating member 106 is installed at the end of the partition plate 33 in the second direction y, and a pipe 107 is installed inside the battery 100, the pipe 107 being used to transport the fluid, and the concentrating member 106 being used to collect the fluid. For example, the connecting pipe module 42 described below may include the pipe 107.

[0229] The present application further provides a method for manufacturing a battery 100, including the steps of: providing a plurality of battery cells 20 arranged along a second direction y; and providing a partition plate 33, the partition plate 33 extending along the second direction y and connected to a first wall 201 of each battery cell 20 in the plurality of battery cells 20, the first wall 201 being the wall with the largest surface area in the battery cell 20, a dimension T1 of the partition plate 33 in the first direction x being greater than 5 mm, and the first direction x being perpendicular to the first wall 201.

[0230] Using the battery cells 20 and partition plates 33 shown in Figures 30 to 34, a 1C / 1C charge / discharge cycle was performed at 60°C until the capacity decayed to 80% SOC, and the test results for the accelerated cycle durability experiment 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.

[0231] [Table 3]

[0232] In some embodiments, as shown in FIGS. 10 to 13 , the reinforcing element 30 is fixedly connected to the first wall 201 of one or more battery cells 20, respectively. Therefore, to ensure the performance of the battery 100, the reinforcing element 30 must also meet strength requirements. The dimension of the reinforcing element 30 in the first direction x is set to 0.1 mm to 100 mm, and the first direction is perpendicular to the first wall 201, thereby achieving a balance between strength and space requirements.

[0233] Specifically, when the dimension T4 of the reinforcing element 30 in the first direction x, i.e., the thickness of the reinforcing element 30, is large, the strength of the reinforcing element 30 is high, and when T4 is small, the reinforcing element 30 occupies little space. If T4<0.1 mm, the reinforcing element 30 is easily damaged by external forces, and if T4>100 mm, it occupies too much space, affecting energy density. Therefore, when the dimension T4 of the reinforcing element 30 in the first direction x is 0.1 mm to 100 mm, it is possible to improve space utilization while ensuring strength.

[0234] In some embodiments, a reinforcing element 30 is installed in the battery 100. The reinforcing element 30 is connected to the first wall 201 of each battery cell 20, which has the largest surface area, among the plurality of battery cells 20 arranged in a row along the second direction y. The reinforcing element 30 is used to conduct heat between the battery cells 20. The surface of the reinforcing element 30 connected to the first wall 201 is an insulating surface. The dimension of the reinforcing element 30 in the first direction x perpendicular to the first wall 201 is 0.1 to 100 mm. This eliminates the need to install an additional structure such as a beam in the center of the casing 10 of the battery 100, thereby maximizing the space utilization rate within the battery 100 and thereby improving the energy density of the battery 100. At the same time, the reinforcing element 30 can ensure electrical insulation and thermal conduction within the battery 100. Therefore, the technical solution of the embodiments of the present application can improve the energy density of the battery 100 and simultaneously ensure the electrical insulation and thermal conduction within the battery 100, thereby improving the performance of the battery 100.

[0235] 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.

[0236] If 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, safety problems may occur. 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 guaranteed and the safety performance of the battery 100 can be guaranteed.

[0237] 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 further satisfy 0 < T5 / T3 ≤ 1, thereby further improving the energy density of the battery 100 and guaranteeing the safety performance of the battery 100.

[0238] In an optional embodiment, the weight M1 of the battery cell 20 and the weight M2 of the heat conduction member 3a satisfy 0 < M2 / M1 ≤ 20.

[0239] 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.

[0240] Optionally, in an 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.

[0241] <由 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.

[0242] S4 is the total surface area of ​​the thermally conductive member 3a connected to the battery cell 20. If S4 / S3 is too large, it will affect the energy density. If S4 / S3 is too small, the thermal conductivity will be poor and safety will be affected. If 0.2≦S4 / S3≦30, the energy density and safety of the battery 10 can be guaranteed.

[0243] Optionally, S4 and S3 further satisfy 2≦S4 / S3≦10, thereby further improving the energy density of the battery 100 and ensuring the safety performance of the battery 100.

[0244] In some embodiments, the specific heat capacity C of the heat conducting member 3a and the weight M2 of the heat conducting member 3a satisfy the relationship 0.02 KJ / (kg2*°C)≦C / M2≦100 KJ / (kg2*°C).

[0245] If C / M2<0.02KJ / (kg2*°C), the thermal conductive member 3a will absorb too much energy, causing the temperature of the battery cell 20 to drop too low, potentially resulting in lithium precipitation. If C / M2>100KJ / (kg2*°C), the thermal conductive member 3a will have poor thermal conductivity and will not be able to quickly remove heat. If 0.02KJ / (kg2*°C)≦C / M2≦100KJ / (kg2*°C), the safety of the battery 100 can be guaranteed.

[0246] Optionally, C and M2 may further The relationship 0.3KJ / (kg2*°C)≦C / M2≦20KJ / (kg2*°C) is satisfied, thereby further improving the safety performance of the battery 100.

[0247] 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 and at least one thermally conductive member 3a arranged along the second direction y, and the at least one row of battery cells 20 and the at least one thermally conductive member 3a are alternately arranged in the first direction x. That is, in each battery module 100a, the rows of battery cells and the thermally conductive member 3a are alternately arranged in the first direction x, and the plurality of battery modules 100 a are housed within a housing 10 to form a battery 100.

[0248] Alternatively, the battery module 100a may include two rows of battery cells 20, with one thermally conductive member 3a installed between the two rows of battery cells 20. No thermally conductive member 3a is installed between adjacent battery modules 100a, which reduces the number of thermally conductive members 3a installed within the battery 100, but still ensures that each battery cell 20 is connected to a thermally conductive member 3a.

[0249] Optionally, when the plurality of battery modules 100 are arranged along the first direction x, with gaps between adjacent battery modules 100, and there is no thermal conductive member 3a between the adjacent battery modules 100, the gaps between the adjacent battery modules 100a can provide expansion space for the battery cells 20.

[0250] Optionally, a fixing structure 103 is provided at an end of the thermally conductive member 3a in the first direction x, and the thermally conductive member 3a is fixed to the housing 10 via the fixing structure 103. As shown in FIG. 19 , the fixing structure 103 may include a fixing member 104, which is fixedly connected to the end of the thermally conductive member 3a and to the battery cell 20 located at the end of the thermally conductive member 3a, thereby enhancing the fixing effect of the battery cell 20.

[0251] Optionally, the thermally conductive member 3a is connected to the first wall 201. That is, the thermally conductive member 3a and the battery cell 20 are fixedly connected to each other by an adhesive method, for example, by a structural adhesive, but the embodiment of the present application is not limited thereto.

[0252] Optionally, the battery cell 20 is housed in a housing 1 0 Optionally, the adjacent battery cells 20 in each row of the battery cells 20 may be bonded together, for example, by bonding the second walls 22 of the adjacent two battery cells 20 together. 0 2 may be bonded with a structural adhesive, but the embodiment of the present application is not limited thereto. The fixing effect of the battery cells 20 can be further strengthened by bonding and fixing adjacent battery cells 20 in each row.

[0253] Using the battery cells 20 and thermal conductive members 3a shown in Figures 10 to 13, the number of battery cells 20 in one row is 2 to 20. A safety test of the battery 10 was conducted in accordance with GB38031-2020, and the test results are shown in Tables 4 to 7. As can be seen from this, the battery 100 of the embodiment of the present application can meet the safety performance requirements.

[0254] [Table 4]

[0255] [Table 5]

[0256] [Table 6]

[0257] [Table 7]

[0258] 15 and 35 , in the third direction z, 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, thereby maximizing the space utilization rate within the battery 100 and thereby improving the energy density of the battery 100.

[0259] In the third direction z, the dimension H1 of the partition plate may be the height of the partition plate, 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.

[0260] If H1 / H2<0.1, the heat exchange area between the battery cells 20 and the partition plate is small, and the battery cells 20 cannot be cooled or heated immediately, making it difficult to meet the thermal management needs of the battery.

[0261] If H1 / H2>2, the thermal management needs of the battery 100 are met, but in this case the partition plate 33 occupies a lot of space, which wastes the space utilization rate in the third direction z, making it difficult to guarantee the requirements for the energy density of the battery 100.

[0262] Alternatively, H1 / H2 may be 0.1, or 0.4, or 0.6, or 0.9, or 1.2, or 1.5, or 1.8, or 2, etc.

[0263] In some examples, the partition plate 33 is a thermal management member 3b used to adjust the temperature of the battery cells 20, and the height of the thermal management member 3b in the third direction z is H1.

[0264] Optionally, the thermal management member 3b can be a water-cooled plate, which is used to cool the battery cells 20 during fast charging or heat the battery cells 20 when the temperature is too low.

[0265] Alternatively, the heat management member 3b may be made of a material with high thermal conductivity, such as a metallic material such as aluminum.

[0266] In some embodiments, the dimension H1 of the partition plate 33 and the dimension H2 of the first wall 201 further satisfy 0.3≦H1 / H2≦1.3, which can ensure that the temperature of the battery cells 20 does not exceed 55°C during fast charging.

[0267] Alternatively, H1 / H2 may be 0.3, or 0.5, or 0.8, or 1.0, or 1.1, or 1.3, etc.

[0268] Optionally, in one embodiment of the present application, 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 / cm 2 ≦Q / S≦6.66Ah / cm 2 Meet the following.

[0269] The heat exchange area S may be the contact area between the first wall 201 and the partition plate 33, and the heat exchange area S satisfies S=H1*L, where L is the dimension of each battery cell 20 along the first direction.

[0270] When Q / S<0.03Ah / cm2, the heat exchange area S is large enough to meet the thermal management requirements of the battery, but in this case the space occupied by the thermal management member 3b becomes too large, making it difficult to meet the energy density requirements of the battery 100.

[0271] Q / S>6.66Ah / cm 2 In this case, the heat exchange area S is small, the heat of the battery cells 20 cannot be immediately dissipated through the partition plate 33, and the battery cells 20 cannot be immediately and rapidly cooled, making it difficult to meet the needs of thermal management.

[0272] 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 fast charging. Furthermore, when the capacity Q of the battery cell is constant, the heat exchange area S can be adjusted to flexibly meet the thermal management needs of the battery.

[0273] In a possible implementation, the dimension H1 of the partition plate 33 is 1.5 cm to 30 cm, which can ensure that the temperature of the battery cells 20 does not exceed 55° C. during the process of fast charging the battery.

[0274] A battery charging test was conducted, and the test results are shown in Table 8.

[0275] [Table 8-1] [Table 8-2]

[0276] In some embodiments, a cavity 30a is located inside a partition plate 33, as shown in FIGS.

[0277] As a result, the partition plate 33 on which the cavity structure is installed has the ability to absorb deformation and can absorb the amount of expansion and deformation of the battery cells 20, 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 a large expansion space for the battery cells 20.

[0278] Furthermore, the cavity 30a is used, for example, when the thickness of the partition plate 33 is large, and can ensure the strength of the partition plate 33 while reducing the weight of the partition plate.

[0279] Optionally, the cavity 30a may be used to accommodate a heat exchange medium for adjusting the temperature of the battery cell 20, thereby making it possible to easily adjust the temperature of the battery cell 20 to an appropriate range at any time and 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 referred to as a heat exchange cavity, and the cavity 30a corresponds to one or more flow paths 30c for accommodating the heat exchange medium.

[0280] The fluid referred to here may be a liquid such as water, which can be adjusted in temperature and does not chemically react with the material of the cavity 30a, and the present application is not limited thereto.

[0281] 12 and 32 , in some embodiments, the cavity 30a has a dimension W in the first direction x, where 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, and the first direction x is perpendicular to the first wall 201, thereby effectively utilizing the partition plate 33 to prevent heat diffusion between the battery cells 20. By rapidly cooling and lowering the temperature of a battery cell 20 whose temperature is too high, the heat of the battery cell 20 is diffused and transferred to adjacent battery cells 20, preventing the adjacent battery cells 20 from becoming too hot.

[0282] If Q / W>400 Ah / mm, the dimension W of the cavity 30a is small, and the volume of fluid that can be accommodated or flowed within the cavity 30a is small, making it impossible to immediately cool the battery cells 20. Therefore, when the temperature of a certain battery cell 20 becomes too high, the battery cell 20 cannot be immediately cooled, and the heat from the battery cell 20 spreads to the adjacent battery cells 20, causing the temperature of the adjacent battery cells 20 to become too high, resulting in abnormalities and affecting the performance of the entire battery 10.

[0283] If Q / W<1.0 Ah / mm, the dimension W of the cavity 30a is large. 30a The volume that can be accommodated or flowed within the cavity 30a is large, and can sufficiently cool the battery cells 20. However, the large dimensions of the cavity 30a increase the space occupied by the partition plate 33, making it impossible to ensure the energy density of the battery 100, and at the same time, a partition plate 33 with too large a volume increases costs.

[0284] The cavity 30a may be formed by a pair of heat-conducting 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-conducting 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 accommodated or flowed within the cavity 30a, thereby accelerating heat transfer between the battery cells 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 of the battery cells 20 is released, thereby cooling the battery cells 20 faster and preventing the heat of the battery cells 20 from dissipating to adjacent battery cells 20. Optionally, the fluid may be circulating to achieve a better temperature control effect. Optionally, the fluid may be water, a mixture of water and ethylene glycol, a refrigerant, air, or the like.

[0285] Fig. 36 is a structural schematic diagram of a battery cell and a thermal management member connected together according to one embodiment of the present application. Fig. 37 is a cross-sectional view taken along direction AA in Fig. 36, and Fig. 38 is an enlarged schematic diagram of area G in Fig. 37. In one embodiment of the present application, referring to Figs. 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.

[0286] The dimension T3 of the battery cell 20 along the first direction x may 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, and the larger the thickness T3, the larger the capacity Q.

[0287] The dimension H1 of the partition plate 33 in the third direction may be the height H of the heat management member 3b in the third direction, and the larger H is, the larger the volume of the heat management member 3b, the larger the occupied space, and at the same time, the higher the heat management capability. For example, if the heat management member 3b is a water-cooled plate, the larger H is, the higher the cooling capability for the battery cells 20 will be, and the more effectively the heat of one battery cell 20 can be prevented from diffusing to adjacent battery cells 20.

[0288] When T3 / H<0.03, the dimension H of the thermal management member 3b along the third direction is large, and the requirement of preventing the heat diffusion of the battery cell 20 can be sufficiently met. However, it is difficult to meet the requirement of the energy density of the battery 10. At the same time, the thermal management member 3b having a large volume increases the production cost. Raise results.

[0289] If T3 / H>5.5, the thermal management member 3b has difficulty meeting the thermal management needs of the battery cell 20, and the heat of the battery cell 20 cannot be immediately dissipated. The heat will diffuse to adjacent battery cells 20, causing temperature abnormalities in other battery cells 20 and affecting the performance of the battery 10.

[0290] In some embodiments, the dimension H1 of the partition plate 33 along the third direction is 15 mm to 300 mm, which allows the partition plate 33 to meet both the needs for strength and heat management performance.

[0291] In some embodiments, the dimension W of cavity 30a is between 0.8 mm and 50 mm, which balances the need for strength and thermal management performance.

[0292] The thermal diffusion test of the battery 100 was carried out in accordance with GB38031-2020 using a combination of two rows of battery cells 20 and two partition plates 33 as follows, and the test results are shown in Table 9.

[0293] [Table 9-1] [Table 9-2]

[0294] In some embodiments, as shown in Figures 32, 33 and 38, the partition plate 33 further includes a pair of thermal conduction plates 333 arranged opposite each other along a first direction, the cavity 30a is arranged between the pair of thermal conduction plates 333, and the first direction is perpendicular to the first wall 201.

[0295] For example, each heat conduction plate 333 extends along the second direction, and two heat conduction plates 333 face each other along the first direction, thereby forming a cavity 30a between the two heat conduction plates 333, and the cavity 30a may be a flow path for the heat exchange medium, thereby forming the partition plate 33 as a heat conduction member 3a or a heat management member 3b.

[0296] In some embodiments, as shown in FIG. 32, the dimension D of the heat conduction plate 333 in the first direction x is between 0.1 mm and 5 mm.

[0297] If the dimension D in the first direction of the heat conduction plate 333 is too small, and if the space within the partition plate 33 is constant, the cavity 30a will occupy most of the space within 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 in the first direction of the heat conduction plate 333 is too large, the cavity 30a within the partition plate 33 will be too small and will not be able to accommodate much fluid, making it impossible to effectively regulate the temperature of the battery cells 20. Therefore, the value of D is set to be 0.1 mm to 5 mm.

[0298] Optionally, a partition 33 The dimension D in the first direction of the pair of heat conduction plates 333 may be the same or different.

[0299] Alternatively, the two heat conducting plates 333 may be made of a material with high heat conducting performance, such as a metal material such as aluminum.

[0300] In some embodiments, as shown in FIGS. 33 and 38, the partition plate 33 further includes a reinforcing rib 334, which is connected to a pair of heat-conducting plates to enhance the structural strength of the partition plate 33. 3It is set up between 33.

[0301] Alternatively, the number of reinforcing ribs 334 may be one, thereby forming one or more cavities 30 a between the pair of heat conduction plates 333 .

[0302] Alternatively, when there are a plurality of cavities 30a, the different cavities 30a may be independent from each other or may be in communication with each other via an adapter.

[0303] 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 set according to requirements, and the embodiments of the present application are not limited thereto.

[0304] In some embodiments, as shown in FIGS. 33 and 45, a reinforcing rib 334 is connected to at least one of the pair of heat conduction plates 333, thereby further ensuring the structural strength of the partition plate 333.

[0305] Alternatively, as shown in FIG. 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.

[0306] Alternatively, as shown in FIG. 33, when the reinforcing rib 334 is connected to a pair of heat conduction plates 333, the included angle between the reinforcing rib 334 and the heat conduction plate 333 may be an acute angle, thereby providing a larger expansion space for the battery cells 20; and when the reinforcing rib 334 is connected to one heat conduction plate 333, as shown in FIG. 33, the included angle between the reinforcing rib 334 and the heat conduction plate 333 may be a right angle, thereby allowing the partition plate to withstand greater pressure.

[0307] Optionally, the reinforcing ribs 334 may be of irregular shapes such as C-shaped, wave-shaped or cross-shaped, which can effectively absorb expansion and also add turbulence to enhance the heat exchange effect.

[0308] In some embodiments, as shown in FIG. 45 , the reinforcing rib 334 includes a first reinforcing rib 3341, and a pair of thermal conduction plates 333 are connected to both ends of the first reinforcing rib 3341, respectively. The first reinforcing rib 3341 is used to support the pair of thermal conduction plates 333. When the partition plate 333 deforms to absorb the expansion force of the battery cells 20, the first reinforcing rib 3341 can deform in response to the pair of thermal conduction plates 333 at least partially moving toward each other along the first direction x.

[0309] When the first reinforcing rib 3341 is installed at an angle 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 and allows it to deform better to meet the needs of absorbing the expansion force of the partition plate 33. The straight shape reduces the deformation space, avoiding the risk of it being easily broken and damaged.

[0310] Alternatively, there may be one or more first reinforcing ribs 3341, and the multiple first reinforcing ribs 3341 may be spaced apart along the third direction z, and the spacing dimensions between two adjacent first reinforcing ribs 3341 may be the same or different.

[0311] Optionally, the material of the first reinforcing rib 3341 may be made using a reinforcing rib structure, which ensures the supporting function while also realizing a lightweight design for the partition plate 333 and a lightweight design for the entire battery 100.

[0312] Optionally, 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 supporting strength.

[0313] Optionally, the first reinforcing rib 3341 has a plate-like structure, which can be deformed better, meets the requirement that the partition plate absorbs the expansion force of the battery cells 20, and is convenient for production and processing, improving manufacturing efficiency.

[0314] In some embodiments, as shown in FIG. 45 , the angle between the first reinforcing rib 3341 and the first direction x is in the range of 30° to 60°, and the angle between the first reinforcing rib 3341 and one of the pair of thermal conduction plates 333 is in the range of 30° to 60°, which not only better meets the support requirements but also makes it less susceptible to deformation and breakage.

[0315] Optionally, when there are a plurality of first reinforcing ribs 3341, the inclination directions of two adjacent first reinforcing ribs 3341 may be the same or different.

[0316] In some embodiments, as shown in FIG. 45 , the reinforcing rib 334 further includes a second reinforcing rib 3342, one end of which is connected to one of the pair of heat conduction plates 333, and the second reinforcing rib 334 2 The other end of the second reinforcing rib 3342 is spaced apart from the other of the pair of heat conduction plates 333, and 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.

[0317] Therefore, by installing the above-mentioned second reinforcing rib 3342, not only can a better supporting effect be achieved in cooperation with the first reinforcing rib 3341, but also the deformation range of the partition plate 33 can be controlled. When the second reinforcing rib 3342 of one of a pair of heat conduction plates 333 contacts the other, the deformation of the partition plate 33 can be further limited, preventing the flow path 30c corresponding to the cavity 30a from being blocked, ensuring the effectiveness of the flow path 30c and the effectiveness of the partition plate 33.

[0318] Alternatively, the pair of thermal conduction plates 333 may be a first thermal conduction plate 3331 and a second thermal conduction plate 3332, respectively, and the second reinforcing rib 3342 may be installed on the first thermal conduction plate 3331 or on the second thermal conduction plate 3332. For example, the second reinforcing rib 3342 is installed on both the first thermal conduction plate 3331 and the second thermal conduction plate 3332.

[0319] 45, in the third direction z, a second reinforcing rib 3342 is disposed between every two adjacent first reinforcing ribs 3341. Optionally, one of the two adjacent second reinforcing ribs 3342 is disposed on the first heat conduction plate 3331, and the other is disposed on the second heat conduction plate 3332, thereby ensuring that the first heat conduction plate 3331 and the second heat conduction plate 3332 are subjected to uniform force and are not subjected to excessive weight at the same time.

[0320] In some embodiments, as shown in FIG. 45 , the second reinforcing rib 3342 extends along the first direction x and protrudes from one of the pair of thermal conduction plates 333, simplifying the structure of the second reinforcing rib 3342 and making it easier to process.

[0321] Optionally, the second reinforcing rib 3342 has a polygonal columnar shape, so that the second reinforcing rib 3342 has a sufficient cross-sectional area. When the partition plate 33 absorbs the expansion force of the battery cells 20 and the second reinforcing rib 3342 installed on one of the pair of heat conduction plates 333 deforms until it contacts the other, the second reinforcing rib 3342 can have a sufficient contact area, further improving the support capacity and preventing the second reinforcing rib 3342 from being damaged and losing its effectiveness, which would cause the two heat conduction plates 333 to come into contact, thereby ensuring the effectiveness of the partition plate 33.

[0322] In some embodiments, as shown in FIG. 45, the first reinforcing rib 3341 and the second reinforcing rib 3342 are spaced apart, thereby ensuring that the two heat conduction plates 333 are subjected to uniform force.

[0323] In some embodiments, the first reinforcing ribs 3341 and the second reinforcing ribs 3342 are arranged alternately along the third direction z (e.g., the height direction of the housing 10), for example, two adjacent first reinforcing ribs 3341 and second reinforcing ribs 3342 may be alternately installed on the first thermal conduction plate 3331 and the second thermal conduction plate 3332, and of course, the position of the second reinforcing rib 3342 may be set according to a certain arrangement rule.

[0324] For example, in the third direction z, one of two adjacent second reinforcing ribs 3342 is installed on the first heat conduction plate 3331, and the other is installed on the second heat conduction plate 3332, thereby ensuring that the first heat conduction plate 3331 and the second heat conduction plate 3332 are subjected to uniform forces and are not subjected to too much weight at the same time.

[0325] By installing in this manner, not only can the uniformity of the supporting action of the two heat conduction plates 333 be ensured, but also the occurrence of blockages in the portions of the flow path 30c corresponding to the cavity 30a along the second direction y can be prevented, thereby ensuring the effectiveness of the flow path 30c.

[0326] In some embodiments, as shown in FIGS. 32 and 45, the thickness D of the thermally conductive plate 333 and the dimension W of the cavity in the first direction x satisfy 0.01≦D / W≦25, thereby achieving both the needs for strength and thermal management performance.

[0327] Specifically, when the dimension W of the cavity 30a is large, the flow resistance of the fluid in the cavity 30a is reduced, improving the heat exchange rate per unit time of the partition plate 33, and when the thickness D of the heat conduction plate 333 is large, the strength of the partition plate 33 is increased. If D / W is less than 0.01, the dimension W of the cavity 30a is sufficiently large, but the occupied space is too large, or the thickness D of the heat conduction plate 333 is too thin in the given space of the partition plate 33, which may result in insufficient strength, for example, in the case of a battery. 10If the ratio D / W is 0.01 or greater, the thermal conductivity plate 333 will not meet the vibration and impact resistance requirements, and the partition plate 33 may even be crushed during initial assembly. If D / W≧25, the thickness D of the thermal conductivity plate 333 is sufficiently thick, but the dimension W of the cavity 30a may be too small for the given space of the partition plate 33, increasing the flow resistance of the fluid within the cavity 30a and resulting in poor heat exchange performance or blocking of the cavity 30a during use. At the same time, the wall thickness of the thermal conductivity plate 333 is too large, so the force generated by the expansion of the battery cells 20 does not meet the crushing force requirement for the partition plate 33 corresponding to the expansion space required for the battery cells 20. That is, the partition plate 33 cannot immediately release the expansion space required for the battery cells 20, accelerating the capacity loss of the battery cells 20. Therefore, if the thickness D of the thermal conductivity plate 333 and the dimension W of the cavity 30a satisfy the relationship 0.01≦D / W≦25, the requirements for strength and thermal management performance can be met, and the performance of the battery 100 can be guaranteed.

[0328] Alternatively, 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 membrane material and reinforced by filling a skeletal structure inside. This method can be used when the strength requirement is low or the compression performance requirement of the partition plate 33 is high.

[0329] Alternatively, when the ratio D / W is in the range of 0.1≦D / W≦1, a means for convective heat exchange or gas-liquid phase change cooling of a fluid working medium may be used inside the partition plate 33, and by using a liquid working medium as a heat exchange medium, the heat exchange performance of the partition plate 33 can be ensured.

[0330] Optionally, when 1≦D / W≦25, a gas-liquid phase change cooling means may be used in the partition plate 33, and by adjusting the internal gap, the overall pressure can be increased, ensuring that the working medium exists in liquid form inside the partition plate 33, preventing the phenomenon of gas and liquid coexisting due to pressure loss, and providing heat exchange performance. At the same time, the thickness D of the heat conduction plate 333 is sufficiently thick to prevent the partition plate 33 from bursting due to the increase in the vaporization pressure of the internal working medium when heated.

[0331] Optionally, the thickness D of the thermally conductive plate 333 and the dimension W of the cavity 30a may further satisfy 0.05≦D / W≦15, or may further satisfy 0.1≦D / W≦1, to better balance space, strength, and heat management, thereby further improving the performance of the battery 100.

[0332] Optionally, the dimension T1 of the partition plate 33 in the first direction x is 0.3 mm to 100 mm.

[0333] T1 is the total thickness of the heat management member partition plate 33, i.e., T1 = 2 * D + W. If T1 is too large, excessive space will be occupied, and if T1 is too small, the strength will be too low or the cavity 30a will be too narrow, affecting the heat management performance. Therefore, if the total thickness T1 of the partition plate 33 is 0.3 mm to 100 mm, space, strength, and heat management can be achieved simultaneously, ensuring the performance of the battery 100.

[0334] Optionally, the thickness D of the heat conducting plate 333 is 0.1 mm to 25 mm.

[0335] If the thickness D of the thermally conductive plate 333 is too large, it will occupy too much space, and the partition plate 33 will not be able to immediately release the expansion space required for the battery cells 20, while if D is too small, the strength will be too low. Therefore, if the thickness D of the thermally conductive plate 333 is between 0.1 mm and 25 mm, the requirements for space, strength, and expansion of the battery cells 20 can be met simultaneously, ensuring the performance of the battery 100.

[0336] Optionally, the dimension W of the cavity 30a in the first direction is 0.1 mm to 50 mm.

[0337] Specifically, the dimension W of the cavity 30a must be larger than the particle size of any foreign matter that may appear inside the cavity 30a to prevent clogging during use. If the dimension W of the cavity 30a is too small, the flow resistance of the fluid within the cavity 30a increases, deteriorating heat exchange performance. Therefore, the dimension W of the cavity 30a is 0.1 mm or greater. If the dimension W of the cavity 30a is too large, it may occupy excessive space or may lack strength. Therefore, if the dimension W of the cavity 30a is 0.1 mm to 50 mm, space, strength, and heat management performance can be achieved simultaneously, ensuring the performance of the battery 100.

[0338] Optionally, 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 mm -1 ≦T1 / S3*1000≦2mm -1 Meet the following.

[0339] If T1 and S3 satisfy the above conditions, the requirements for the heat exchange performance and the dimensional space of the battery cell 20 can be met. Specifically, the area of ​​the first wall 201 of the battery cell 20 S3 When the total thickness of the partition plate 33 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. T A larger T1 / S3*1000 can improve strength. If T1 / S3*1000 is less than 0.03 mm-1, the area A of the first wall 201 of the battery cell 20 is sufficiently large, but the partition plate 33 is too thin and lacks strength, which may cause breakage or cracks in the partition plate 33 during use. If T1 / S3*1000 is greater than 2 mm-1, the partition plate 33 is sufficiently thick, but the area S3 of the first wall 201 of the battery cell 20 is too small, which may result in an insufficient cooling surface for the battery cell 20 and insufficient heat dissipation requirements for the battery cell 20. Therefore, when the total thickness T1 of the partition plate 33 and the area S3 of the first wall 201 satisfy 0.03 mm-1≦T1 / S3*1000≦2 mm-1, the strength and thermal management performance requirements can be met, and the performance of the battery 100 can be guaranteed.

[0340] Optionally, the partition plate 33 further includes a reinforcing rib 334, which is disposed between the pair of heat conduction plates 333, and the thickness X of the reinforcing rib 334 is equal to or greater than (-0.0005*F+0.4738) mm, where F is the tensile strength of the material of the reinforcing rib 334, expressed in MPa. That is, the thickness X of the reinforcing rib 334 is at least (-0.0005*F+0.4738) mm.

[0341] 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 meet the requirements of the force to be received by the partition plate 33, a material with higher strength may be selected to make the thickness X of the inner reinforcing rib 334 thinner, thereby saving space and improving energy density. Optionally, the thickness X of the reinforcing rib 334 may be 0.2 mm to 1 mm.

[0342] Using the battery cell 20 and partition plate 33 shown in Figure 45, a simulation test was conducted on the heating rate and the deformation force of the partition plate 33, and the test results are shown in Table 10. In Table 10, L is the dimension of the battery cell 20 in the second direction y, T3 is the dimension of the battery cell 20 in the first direction x, and H2 is the dimension of the first wall 201 of the battery cell 20 in the third direction z, where the third direction is perpendicular to the first direction x and the second direction y.

[0343] [Table 10-1]

[0344] 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 is connected to the medium inlet 3412 and the medium outlet 3422, so that the cavity 30a can accommodate a heat exchange medium for regulating the temperature of the battery cells 20. The partition plate 33 is provided with a cavity 30b that is blocked from both the medium inlet 3412 and the medium outlet 3422, so that the cavity 30b can block the inflow of the heat exchange medium, thereby regulating the temperature of the battery cells 20 and reducing the weight of the partition plate 33. This can reduce the weight of the partition plate 33 and mitigate the phenomenon of the heat exchange medium flowing into the cavity 30b during use, which would increase the weight of the partition plate 33. This can effectively reduce the weight of the battery 100 having such a partition plate 33, which is beneficial to improving the energy density of the battery 100 and improving the usage performance of the battery 100.

[0345] For example, the medium inlet 3412 and the medium outlet 3422 are respectively located at both ends of the partition plate 33, and the cavity 30a and the cavity 30b are both located inside the partition plate 33. The cavity 30a communicates with the medium inlet 3412 and the medium outlet 3422, i.e., 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 the medium inlet 3412 and the medium outlet 3422, i.e., there is no communication between the cavity 30b and the medium inlet 3412 or the medium outlet 3422, and the fluid medium cannot flow into the cavity 30b.

[0346] The partition plate 33 may have one or more cavities 30b therein, and similarly, the partition plate 33 may have one or more cavities 30a therein. When there are multiple cavities 30a, each cavity 30a communicates with the medium inlet 3412 and the medium outlet 3422, i.e., both ends of the multiple cavities 30a communicate with the medium inlet 3412 and the medium outlet 3422, respectively. Illustratively, in the embodiment of the present application, the partition plate 33 has multiple cavities 30a and multiple hollows 30b therein.

[0347] 47 and 48, in some embodiments, the partition plate 33 includes a body plate 331 (also referred to as a body portion), a first bus member 341, and a second bus member 342. The body plate 331 has a cavity 30a and a hollow 30b. The first bus member 341 and the second bus member 342 are respectively disposed at opposite ends of the body plate 331 along the length direction of the body plate 331 (i.e., the second direction y), and a media inlet 3412 and a media outlet 3422 are respectively disposed in the first bus member 341 and the second bus member 342.

[0348] Both the cavity 30a and the cavity 30b are located inside the body plate 331. For example, in FIG. 48, both the cavity 30a and the cavity 30b extend along the length of the body plate 331, and both ends of the cavity 30a respectively penetrate both ends of the body plate 331, so that the cavity 30a can communicate with the medium inlet 3412 of the first bus member 341 and the medium outlet 3422 of the second bus member 342.

[0349] It should be noted that the body plate 331, the first bus member 341, and the second bus member 342 may be an integral structure or a separate structure. If the body plate 331, the first bus member 341, and the second bus member 342 are an integral structure, they may be manufactured by a casting or injection molding process. 1、When 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 body plate 331 by bolting, fastening, adhesive, or the like.

[0350] 48 to 51, in some embodiments, a passage 3151 is provided inside the body plate 331, and the passage 3151 penetrates both ends of the body plate 331 in the longitudinal direction of the body plate 331. The partition plate 33 further includes a blocking member 318, which is connected to the body plate 331 and blocks both ends of the passage 3151 to form a cavity 30b.

[0351] Along the length of the main plate 331, blocking members 318 are installed on both ends of the passage 3151 that penetrate the main plate 331, and the blocking members 318 block both ends of the passage 3151 to form a sealed cavity 30b, thereby blocking the cavity 30b from the medium inlet 3412 and the medium outlet 3422.

[0352] For example, the blocking member 318 may be a metal sheet, a rubber stopper, a silica gel stopper, etc. In the actual manufacturing process, different blocking members 318 may 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 block the passage 3151, or a rubber stopper or silicone stopper may be used to block the passage 3151. If the passage 3151 is small, there is a problem that a metal piece is difficult to weld, so a rubber stopper or silicone stopper can be engaged in the passage 3151 to block the passage 3151.

[0353] 48 to 51, in some embodiments, the blocking member 318 is detachably connected to the body plate 331. By detachably connecting the blocking member 318 to the body plate 331, the blocking member 318 can be quickly removed and replaced, which is advantageous in that on the one hand, different passages 3151 can be blocked according to actual needs during use to meet 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.

[0354] Illustratively, the blocking member 318 is attached to one end of the passage 3151 to block the passage 3151. Of course, in other embodiments, the blocking member 318 may be removably connected to the body plate 331 using a method such as bolting or fastening.

[0355] 48 to 51, cavity 30b is a sealed structure formed by blocking passage 3151 inside main plate 331 with blocking member 318, but in other embodiments, as shown in FIG. 50, cavity 30b may be a structure formed by integrally molding main plate 331, that is, cavity 30b is formed by forming main plate 331 into a structure having a cavity inside by a process such as casting or pressing, and therefore blocking member 318 and main plate 331 are an integral structure.

[0356] A passage 3151 is formed inside the main plate 331 in the longitudinal direction of the main plate 331, penetrating both ends of the main plate 331. A blocking member 318 is installed on the main plate 331, so that the blocking member 318 blocks both ends of the passage 3151, thereby forming a cavity 30b that is blocked off 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 blocked according to actual needs, thereby expanding the range of applications of the partition plate 33.

[0357] In some embodiments, a first chamber communicating with the media inlet 3412 is formed inside the first bus member 341, a second chamber communicating with the media outlet 3422 is formed inside the second bus member 342, and the flow path 30c passes through both ends of the body plate 331 in the longitudinal direction of the body plate 331 and communicates with the first chamber and the second chamber.

[0358] A first chamber communicating with the medium inlet 3412 is formed inside the first bus member 341, i.e., a first chamber is formed inside the first bus member 341, and the medium inlet 3412 penetrates the chamber wall of the first chamber. When 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 all of the multiple flow paths 30c are mutually connected to the first chamber of the first bus member 341, and communication between the multiple flow paths 30c and the medium inlet 3412 is realized.

[0359] Similarly, a second chamber communicating with the medium outlet 3422 is formed inside the second bus member 342, i.e., 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 body plate 331, the flow path 30c penetrating one end of the body plate 331 can communicate with the second chamber inside the second bus member 342, thereby all of the multiple flow paths 30c are connected to each other and the second chamber of the second bus member 342, and all of the multiple flow paths 30c are connected to the medium outlet 3422.

[0360] Note that cavity 30b does not communicate with either the first chamber of first bus member 341 or the second chamber of second bus member 342, thereby blocking cavity 30b from both medium inlet 3412 and medium outlet 3422.

[0361] The first bus member 341 is provided with a first chamber communicating with the flow path 30c, and the second bus member 342 is provided with a second chamber communicating with the medium outlet 3422. After passing through both ends of the main plate 331, the flow path 30c can communicate with both the first chamber and the second chamber, thereby realizing communication between the flow path 30c and both the medium inlet 3412 and the medium outlet 3422. This allows fluid medium to be simultaneously injected into multiple flow paths 30c through the medium inlet 3412 and the medium outlet 3422 during use, improving usage efficiency.

[0362] In some embodiments, as shown in Figures 47 and 48, both the hollows 30b and the cavities 30a extend along the length of the body plate 331 and are arranged along the width of the body plate 331 (i.e., the third direction z).

[0363] The partition plate 33 is provided with a cavity 30a and a plurality of cavities 30b, the cavity 30a corresponding to a plurality of channels 30c, the cavity 30b and the channels 30c both extending along the length of the body plate 331, and the plurality of cavities 30b and the plurality of channels 30c both arranged along the width of the body plate 331. There may be various arrangements of the plurality of cavities 30b and the plurality of channels 30c, for example, the cavities 30b and the channels 30c may be arranged alternately, the plurality of cavities 30b may be located on one side of the plurality of channels 30c along the width of the body plate 331, or the plurality of cavities 30b may be arranged in the middle of the body plate 331 along the width of the body plate 331, and channels 30c may be arranged on both sides of the plurality of cavities 30b. For example, in FIG. 48, two flow paths 30c are installed in the middle of the main body plate 331 along the width direction of the main body plate 331, and three cavities 30b are installed on both sides of the two flow paths 30c, and one flow path 30c is installed on each end of the main body plate 331.

[0364] Both the cavity 30b and the flow path 30c extend along the length of the main plate 331 and are arranged along the width of the main plate 331, which makes it easy to process and manufacture the cavity 30b and the flow path 30c and to optimize the arrangement position of the flow path 30c, which helps to improve the ability of the partition plate 33 to adjust to the temperature of the battery 100.

[0365] In some embodiments, as shown in FIGS. 48 and 49, the flow channel 30c is located in the middle of the body plate 331 along the width direction of the body plate 331.

[0366] The flow path 30c is provided in the middle of the main body plate 331. When there is one flow path 30c, the flow path 30c is provided in the middle of the main body plate 331. When there are multiple flow paths 30c, at least some of the multiple flow paths 30c are located in the middle of the main body plate 331 in the width direction of the main body plate 331. For example, in FIGS. 48 and 49, 33 Two flow paths 30c are provided in the middle of the body plate 331 along the width direction of the body plate 331, and of course, in other embodiments, for example, one, three, or four flow paths 30c may be provided in the middle of the body plate 331 along the width direction of the body plate 331.

[0367] By installing a flow path 30c in the middle of the width of the main plate 331, heat exchange can be performed in areas where heat concentrates inside the battery 100, which helps to improve the thermal management performance of the partition plate 33 for the battery 100.

[0368] In some embodiments, refer to Fig. 51, which is a cross-sectional view of a main plate 331 of a partition plate 33 according to another embodiment of the present application. A plurality of flow channels 30c and a plurality of cavities 30b are provided in the partition plate 33, and the cavities 30b and the flow channels 30c are alternately arranged along the width direction of the main plate 331.

[0369] The cavities 30b and the flow paths 30c are arranged alternately, i.e., the cavities 30b and the flow paths 30c are arranged alternately in order along the width direction of the main body plate 331, i.e., along the width direction of the main body plate 331, a cavity 30b is located between two adjacent flow paths 30c, and a flow path 30c is located between two adjacent cavities 30b.

[0370] The cavities 30b and the flow paths 30c are arranged alternately along the width direction of the main plate 331; that is, there are multiple cavities 30b and multiple flow paths 30c, and the cavities 30b and the flow paths 30c are arranged alternately with each other, so that the flow paths 30c are arranged in a dispersed manner along the width direction of the main plate 331. This effectively reduces the phenomenon in which the flow paths 30c are concentrated, resulting in an imbalance in the heat exchange capacity of the partition plate 33, and helps improve the usage performance of the partition plate 33.

[0371] In some embodiments, as shown in FIG. 49 , the body plate 331 has two opposing side surfaces 3312 along the thickness direction of the body plate 331 (i.e., the first direction x), and the area of ​​one side surface 3312 is S 5 and the total area of ​​the projection of the flow channel 30c on the side surface 3312 is S 6 and S 6 / S 5 ≧0.2.

[0372] The area of ​​one side surface 3312 is 5, the total area of ​​the projections of the channels 30c on the side surface 3312 is S6, and S6 / S5≧0.2, that is, the total area occupied by the channels 30c on the side surface 3312 of the body plate 331 is 20% or more.

[0373] By making the area occupied by the multiple flow paths 30c on the side surface 3312 of the main body plate 331 20% or more, the phenomenon in which the area occupied by the flow paths 30c is too small and the heat exchange capacity is low can be reduced, and the heat exchange performance of the partition plate 33 can be guaranteed.

[0374] 46 and 47 , the cavities 30a of the multiple partition plates 33 are connected in series with each other, i.e., the medium inlet 3412 of one partition plate 33 is connected to the medium outlet 3422 of another partition plate 33, and it is understood that the flow paths 30c of the multiple partition plates 33 may be connected in parallel with each other, i.e., the medium inlets 3412 of the multiple partition plates 33 are connected to each other, and the medium outlets 3422 of the multiple partition plates 33 are connected to each other. Installing multiple partition plates 33 in the battery 100 is advantageous in improving the thermal management capability of the partition plates 33 for the battery cells 20 in such a battery 100, and reducing the safety risk caused by an increase in the internal temperature of the battery 100.

[0375] In some embodiments, as shown in FIGS. 46 and 47, the media outlet 3422 of one partition plate 33 communicates with the media inlet 3412 of another partition plate 33.

[0376] There may be multiple structures in which the medium outlet 3422 of one partition plate 33 is connected to the medium inlet 3412 of another partition plate 33, and the medium outlet 3422 of one partition plate 33 may be connected to the medium inlet 3412 of another partition plate 33, or they may be connected via other components, such as connecting piping, thereby realizing a series connection structure of multiple partition plates 33.

[0377] By connecting the medium outlet 3422 of one of the multiple partition plates 33 and the medium inlet 3412 of another partition plate 33 to each other, a series connection structure of multiple partition plates 33 is realized, which makes assembly and processing easy and makes it easy to inject fluid medium into the flow paths 30c of the multiple partition plates 33 during use.

[0378] In some embodiments, a plurality of flow paths 30c are provided in the partition plate 33, and along the flow direction of the fluid medium in the flow paths 30c of the plurality of partition plates 33, the number of flow paths 30c of the partition plate 33 located downstream of two adjacent partition plates 33 is greater than the number of flow paths 30c of the partition plate 33 located upstream.

[0379] Here, this is along the flow direction of the fluid medium in the flow paths 30c of the multiple partition plates 33, i.e., the direction in which the fluid medium flows through the flow paths 30c of the multiple partition plates 33. Of two adjacent partition plates 33, the number of flow paths 30c of the partition plate 33 located downstream is greater than the number of flow paths 30c of the partition plate 33 located upstream, i.e., of two adjacent partition plates 33 in the flow direction of the fluid medium, the partition plate 33 through which the fluid medium passes first is the partition plate 33 located upstream, and the partition plate 33 through which the fluid medium passes last is the partition plate 33 located downstream, i.e., the fluid medium flows from the flow paths 30c of the partition plate 33 located upstream to the flow paths 30c of the partition plate 33 located downstream.

[0380] By making the number of flow paths 30c of the partition plate 33 located downstream greater than the number of flow paths 30c of the partition plate 33 located upstream, it is advantageous to improve the heat exchange capacity of the partition plate 33 located downstream, thereby ensuring that the heat exchange capacities of the multiple partition plates 33 are balanced with each other, improving the overall thermal management capacity, and effectively mitigating the phenomenon of local temperature rise inside the battery 100.

[0381] In some embodiments, the media inlets 3412 of the multiple partitions 33 communicate with each other, and the media outlets 3422 of the multiple partitions 33 communicate with each other.

[0382] Here, the medium inlets 3412 of the multiple partition plates 33 may be directly connected, or may be connected via other components, such as connecting pipes, and the same applies to the medium outlets 3422 of the multiple partition plates 33, thereby realizing a parallel connection structure of the multiple partition plates 33.

[0383] The medium inlets 3412 of the multiple partition plates 33 are connected to each other, and the medium outlets 3422 of the multiple partition plates 33 are connected to each other, thereby realizing a parallel connection structure of the multiple partition plates 33. On the one hand, this realizes the function of simultaneously injecting fluid medium into the flow paths 30c of the multiple partition plates 33, and on the other hand, it effectively ensures the balance of the heat exchange capacity of each partition plate 33, and effectively mitigates the phenomenon of local temperature rise inside the battery 100.

[0384] In some embodiments, as shown in FIG. 24 , a partition member 335 is provided in the cavity 30a, and the partition member 335 is used to divide the cavity 30a and form at least two flow paths 30c, which makes it easy to control the placement of the fluid medium inside the cavity according to actual needs, thereby rationally adjusting the temperature of the battery cell 20.

[0385] For example, multiple flow paths 30c may be arranged in sequence along a third direction z, with each flow path 30c extending along the second direction y, the third direction being perpendicular to the second direction and parallel to the first wall 201.

[0386] The flow paths 30c may be independent of each other or may be connected to each other. A fluid medium may be contained in only some of the multiple flow paths 30c, or in all of the flow paths 30c. Therefore, the partition member 335 separates the interior of the partition plate 33 to form multiple flow paths 30c, making it easy to control the placement of the fluid medium inside the partition plate 33 according to actual needs, thereby rationally adjusting the temperature of the battery cell 20.

[0387] Alternatively, the partition member 335 may be integrally formed with the partition plate 33, for example, by forming the partition member 335 and the partition plate 33 by an integral molding process such as injection molding, extrusion, etc. Alternatively, 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 welding, adhesive, fastening, etc.

[0388] Of course, only one flow channel 30c may be formed in the cavity 30a.

[0389] In some embodiments, the partition plate 33 includes a main body plate 331, a cavity 30a is provided inside the main body plate 331, and the cavity 30a may have one or more flow paths 30c. The insulating layer 32 includes a first insulating layer 32a, and at least a portion of the first insulating layer 32a is disposed between the main body plate 331 and the battery cell 20.

[0390] 20 and 21, the partition plate 33 further includes a junction pipe 332, which includes a junction chamber 332a (shown in FIGS. 26 and 28), which communicates with the plurality of flow paths 30c, and the insulating layer 32 includes a second insulating layer 32b, at least a portion of which is disposed between the junction pipe 332 and the battery cells 20, thereby insulating and isolating the battery cells 20 from the junction pipe 332.

[0391] "The second insulating layer 32b covers at least a portion of the outer surface of the junction pipe 332" may be understood to mean that a portion of the second insulating layer 32b covers at least a portion of the outer surface of the junction pipe 332, thereby insulating and isolating the battery cells 20 and the junction pipe 332.

[0392] 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.

[0393] 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.

[0394] When 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, the portion of the second insulating layer 32b may cover only the outer peripheral surface of the first bus member 341, and the two end faces of the first bus member 341 along the third direction z are not covered by the insulating layer 32. Compared to when the insulating layer 32 covers only the main plate 331, the creepage distance between the battery cell 20 and the portion of the first bus member 341 that is not covered by the insulating layer 32 can be increased, reducing the risk of the battery 100 being short-circuited. Alternatively, the portion of the insulating layer 32 may cover the entire outer surface of the first bus member 341.

[0395] In another embodiment, insulating layer 32 may not cover the outer surface of first bus member 341. First bus member 341 extends along third direction z, and second bus member 342 extends along third direction z.

[0396] When 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 32b may cover only a portion of the outer surface of the second bus member 342. For example, the portion of the insulating layer 32 may cover only the outer peripheral surface of the second bus member 342, and the two end faces of the second bus member 342 in the third direction z may not be covered by the second insulating layer 32b. This increases the creepage distance between the battery cells 20 and the portions of the second bus member 342 that are not covered by the insulating layer 32, and reduces the risk of short-circuiting the battery 100, compared to when the insulating layer 32 covers only the body plate 331. Alternatively, the portion of the second insulating layer 32b may cover the entire outer surface of the second bus member 342.

[0397] In another embodiment, as shown in FIGS. 27 and 29, the insulating layer 32 may not cover the outer surface of the second bus member 342.

[0398] Therefore, the second insulating layer 32b covers at least a portion of the outer surface of the junction pipe 332, and the second insulating layer 32b may completely cover the outer surface of the junction pipe 332 or may cover only one side of the junction pipe 332 facing the battery cells 20, and the second insulating layer 32b can be used to insulate and isolate the junction pipe 332 and the battery cells 20, thereby reducing the risk of the battery short-circuiting and improving the safety performance of the battery.

[0399] In this embodiment, the junction pipe 332 may be located on one side of the battery cell 20, and since the junction pipe 332 also contains a fluid medium, the junction pipe 332 can also be used to perform heat exchange for the battery cell 20. The second insulating layer 32b covers at least a portion of the outer surface of the junction pipe 332, and the second insulating layer 32b may completely cover the outer surface of the junction pipe 332 or may cover only one side of the junction pipe 332 facing the battery cell 20. The second insulating layer 32b can be used to insulate and isolate the junction pipe 332 from the battery cell 20, thereby reducing the risk of the battery short-circuiting and improving the safety performance of the battery.

[0400] Referring to Figures 20, 21, 25 and 26, in this embodiment, the two junction pipes 332 are respectively a first bus member 341 and a second bus member 342, a medium inlet 3412 is installed in the first bus member 341, a first junction chamber 3411 connected to the medium inlet 3412 is formed inside the first bus member 341, a medium outlet 3422 is installed in the second bus member 342, a second junction chamber 3421 connected to the medium outlet 3422 is formed inside the second bus member 342, and both the first junction chamber 3411 and the second junction chamber 3421 are connected to each flow path 30c.

[0401] The medium inlet 3412 is installed in the first bus member 341, and the medium outlet 3422 is installed in the second bus member 342. The first junction chamber 3411 of the first bus member 341 and the second junction chamber 3421 of the second bus member 342 are both connected to each flow path 30c. The fluid medium flows from the medium inlet 3412 into the first junction chamber 3411, and then passes through the first junction chamber 3411 to be distributed to each flow path 30c. 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 junction chamber 3421, and is discharged from the medium outlet 3422.

[0402] In another embodiment, the partition plate 33 does not need to be provided with a junction pipe 332, and each flow path 30c is provided with a corresponding medium inlet 3412 and medium outlet 3422, so that the fluid medium flows into each flow path 30c through its respective medium inlet 3412 and is discharged from each flow path 30c. This type of installation makes it easy to independently control the total amount and flow rate of the fluid medium in each flow path 30c.

[0403] In this embodiment, the installation of the first bus member 341 helps to distribute the fluid medium to each flow path 30c, which is beneficial to uniform temperature control of the battery cells 20, and the installation of the second bus member 342 helps to quickly discharge the fluid medium, which improves heat exchange efficiency.

[0404] 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 body plate 331 is h2, and h3 / h2 ≥ 0.00625. The larger the creepage distance between the junction pipe 332 and the battery cell 20, the higher the safety, reducing the risk of electrical contact between them in various usage scenarios.

[0405] h3 / h2 may be 0.01, 0.015, 0.1, 0.15, 0.2, 0.25, 0.3, 0.35, 0.4, etc.

[0406] In some embodiments, the insulating layer 32 is a constant 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, i.e., h1 = h3. In other embodiments, the thickness of the first insulating layer is different from the thickness of the second insulating layer.

[0407] 20, 21, and 25-29, in some embodiments, a first flow conduit 343 is provided at the medium inlet 3412, and a second flow 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 flow conduit 343, thereby insulating and isolating the battery cell 20 from the first flow conduit 343, and / or a portion of the third insulating layer 32c covers the outer surface of the second flow conduit 344, thereby insulating and isolating the battery cell 20 from the second flow conduit 344.

[0408] The first flow conduit 343 may be provided only at the medium inlet 3412, or the second flow conduit 344 may be provided only at the medium outlet 3422, or the first flow conduit 343 may be provided at the medium inlet 3412 and the second flow conduit 344 may be provided at the medium outlet 3422. 2 3 shows a case where a first flow guide 343 is provided at the medium inlet 3412 and a second flow guide 344 is provided at the medium outlet 3422.

[0409] As shown in FIGS. 20, 21, and 25 to 29, when a portion of the insulating layer 32 covers the outer surface of the first flow conduit 343, the portion of the insulating layer 32 may cover only a portion of the outer surface of the first flow conduit 343. For example, the portion of the insulating layer 32 may cover only the outer periphery of the first flow conduit 343, leaving the two axial end faces of the first flow conduit 343 uncovered by the insulating layer 32. This increases the creepage distance between the battery cells 20 and the portions of the first flow conduit 343 not covered by the insulating layer 32, compared to when the insulating layer 32 covers only the body plate 331, the first bus member 341, and the second bus member 342, thereby reducing the risk of short-circuiting the battery 100. Alternatively, the portion of the insulating layer 32 may cover the entire outer surface of the first flow conduit 343. In another embodiment, as shown in FIG. 25, the insulating layer 32 need not cover the outer surface of the first flow conduit 343.

[0410] 20, 21, and 25 to 29, when a portion of the insulating layer 32 covers the outer surface of the second flow conduit 344, the portion of the insulating layer 32 may cover only a portion of the outer surface of the second flow conduit 344. For example, the portion of the insulating layer 32 may cover only the outer periphery of the second flow conduit 344, leaving the two axial end faces of the second flow conduit 344 uncovered by the insulating layer 32. This increases the creepage distance between the battery cells 20 and the portions of the second flow conduit 344 that are not covered by the insulating layer 32, and reduces the risk of short-circuiting the battery 100, compared to when the insulating layer 32 covers only the body plate 331, the first bus member 341, and the second bus member 342. Alternatively, the portion of the insulating layer 32 may cover the entire outer surface of the second flow conduit 344.

[0411] In another embodiment, the insulating layer 32 may not cover the outer surface of the second flow conduit 344 .

[0412] As shown in Figures 20, 21, and 25 to 29, the first flow guide pipe 343 and the second flow guide pipe 344 are arranged coaxially, and the axial direction of the first flow guide pipe 343 and the axial direction of the second flow guide pipe 344 are both parallel to the second direction y.

[0413] 20, 21, and 25 to 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.

[0414] A first stopper 361 is provided on the outer circumferential surface of the first guide pipe 343. The first stopper 361 protrudes from the outer circumferential surface of the first guide pipe 343 in the radial direction of the first guide pipe 343 and is used to limit the distance the first guide pipe 343 is inserted into the first bus member 341. After the first guide pipe 343 is inserted into the medium inlet 3412 of the first bus member 341, the first stopper 361 abuts against the outer wall of the first bus member 341. The first guide pipe 343 may be welded to the first bus member 341 via the first stopper 361.

[0415] A second stopper 371 is provided on the outer circumferential surface of the second guide pipe 344. The second stopper 371 protrudes from the outer circumferential surface of the second guide pipe 344 in the radial direction of the second guide pipe 344 and is used to limit the distance the second guide pipe 344 is inserted into the second bus member 342. After the second guide pipe 344 is inserted into the medium outlet of the second bus member 342, the second stopper 371 abuts against the outer wall of the second bus member 342. The second guide pipe 344 may be welded to the second bus member 342 via the second stopper 371.

[0416] In another embodiment, the first flow conduit 343 may not be provided at the medium inlet 3412, and the second flow conduit 344 may not be provided at the medium outlet 3422.

[0417] The first conduit 343 allows the fluid medium to easily flow into the first junction chamber 3411 of the first bus member 341, and the second conduit 344 allows the fluid medium to easily discharge from the second junction chamber 3421 of the second bus member 342. A portion of the insulating layer 32 covers the outer surface of the first conduit 343 to insulate the first conduit 343 from the battery cells 20, and / or a portion of the insulating layer 32 covers the outer surface of the second conduit 344 to insulate the second conduit 344 from the battery cells 20, thereby reducing the risk of short-circuiting the battery 100 and improving its safety performance.

[0418] In some embodiments, the first bus member 341 and the second bus member 342 are located on opposite sides of the battery cell 20 along the second direction y, and the third direction z is perpendicular to the second direction y.

[0419] The first bus member 341 and the second bus member 342 are located on both sides of the battery cell 20, respectively. The arrangement directions of the first bus member 341 and the second bus member 342 are offset from the extending directions of the tabs of the battery cell 20. As a result, the first bus member 341 and the second bus member 342 are both installed offset from the electrical energy output poles of the battery cell 20, so as to prevent the first bus member 341 and the second bus member 342 from affecting the charging and discharging of the battery cell 20 or the series connection, parallel connection, or series-parallel connection between the battery cells 20.

[0420] 20 , the body plate 331 protrudes in the second direction y from both ends of the battery cell 20 in the second direction y. The first bus member 341 and the second bus member 342 are connected to both ends of the body plate 331 in the second direction y, respectively. The multiple battery cells 20 can be stacked and arranged facing each other in the second direction y without interfering with the first bus member 341 and the second bus member 342, allowing the multiple battery cells 20 to be arranged more compactly, which is advantageous for reducing the volume of the battery 100.

[0421] 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 , which is used to electrically isolate the reinforcing element 30 from the battery case 21 .

[0422] The insulating layer may be a blue film coated on the outer surface of the battery case 21, or may be an insulating coating layer coated on the outer surface of the battery case 21. An 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 reinforcing element 30 together insulate the battery cell 20 and the reinforcing element 30, further reducing the risk of the battery 100 being short-circuited.

[0423] In some embodiments, as shown in Figures 52 to 64, the reinforcing element 30 includes a first thermal conduction plate 3331, a second thermal conduction plate 3332 and a partition member 335 arranged in a stacked manner, the partition member 335 being arranged between the first thermal conduction plate 3331 and the second thermal conduction plate 3332, the first thermal conduction plate 3331 and the partition member 335 together defining a first flow path 34, and the second thermal conduction plate 3332 and the partition member 335 together defining a second flow path 35.

[0424] When the reinforcing element 30 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 adjacent battery cells 20, thereby reducing the temperature difference between the two adjacent battery cells 20. The expansion of one battery cell 20 does not press the flow path corresponding to the other battery cell 20 so as to reduce its dimension, or has little impact on the dimension 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 ensuring the safety performance of the battery 100 using the reinforcing element 30.

[0425] Furthermore, the first flow path 34 and the second flow path 35 each correspond to two adjacent battery cells 20, and each can independently withstand deformation caused by the expansion of the corresponding battery cell 20. Therefore, the expansion of one battery cell 20 does not interfere with or affect the expansion of the other battery cell 20, which is advantageous for dissipating the expansion of the two adjacent battery cells 20. This reduces the occurrence of early decompression of the battery cells 20 or serious thermal runaway accidents caused by the expansion of the two adjacent battery cells 20 interfering with each other, and improves the safety performance of the battery 100.

[0426] Both the first flow path 34 and the second flow path 35 are used to store a fluid medium, and the fluid medium can flow through the first flow path 34 and the second flow path 35. Here, the first flow path 34 and the second flow path 35 may be independent of each other, and the fluid medium in the first flow path 34 does not flow into the second flow path 35, and the fluid medium in the second flow path 35 does not flow into the first flow path 34.

[0427] For example, along the extension direction of the first flow path 34, the first flow path 34 has a first inlet and a first outlet located at both ends of the first flow path 34, and the fluid medium flows into the first flow path 34 from the first inlet and is discharged by the first flow path 34 from the first outlet, and along the extension direction of the second flow path 35, the second flow path 35 has a second inlet and a second outlet located at both ends of the second flow path 35, and the fluid medium flows into the second flow path 35 from the second inlet and is discharged by the second flow path 35 from the second outlet.

[0428] The first flow path 34 and the second flow path 35 may be connected to each other, and the fluid medium in the first flow path 34 can flow into the second flow path 35, or the fluid medium in the second flow path 35 can flow into the first flow path 34.

[0429] In an embodiment with one battery cell 20, the reinforcing element 30 is disposed 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 disposed closer to the battery cell 20 than the second flow path 35, and the second flow path 35 is disposed closer to the inner wall of the housing 10 than the first flow path 34.

[0430] In an embodiment in which there are a plurality of battery cells 20, the plurality of 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).

[0431] 53 and 54 , a reinforcing element 30 may be installed between two adjacent battery cells 20. For ease of explanation, the two adjacent battery cells 20 are defined as a first battery cell 21 and a second battery cell 22, respectively, 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 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 conduction plate 3331, the second heat conduction plate 3332, and the partition member 335. The first flow path 34 is installed corresponding to the first battery cell 21, the first thermal conduction plate 3331 is used for thermally conducting connection to the first battery cell 21, and the fluid medium in the first flow path 34 is used for heat exchange with the first battery cell 21 to adjust the temperature of the first battery cell 21. The second flow path 35 is installed corresponding to the second battery cell 22, the second thermal conduction plate 3332 is used for thermally conducting connection to the second battery cell 22, and the fluid medium in the second flow path 35 is used for heat exchange with the second battery cell 22 to adjust the temperature of the second battery cell 22.

[0432] A thermally conductive connection means that heat can be transferred between them. For example, when the first thermally conductive plate 3331 is thermally conductively connected to the first battery cell 21, heat can be transferred between the first battery cell 21 and the first thermally conductive plate 3331, and heat can be transferred between the fluid medium in the first flow path 34 and the first battery cell 21 via the first thermally conductive plate 3331, thereby realizing heat exchange between the fluid medium in the first flow path 34 and the first battery cell 21. When the second thermally conductive plate 3332 is thermally conductively connected to the second battery cell 22, heat can be transferred between the second battery cell 22 and the second thermally conductive plate 3332, and heat can be transferred between the fluid medium in the second flow path 35 and the second battery cell 22 via the second thermally conductive plate 3332, thereby realizing heat exchange between the fluid medium in the second flow path 35 and the second battery cell 22.

[0433] As shown in Figures 53 and 54, 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 respectively, reducing the temperature difference between the two adjacent battery cells 20, and the expansion of one battery cell 20 does not press the flow path corresponding to the other battery cell 20 to reduce its dimension or has little impact on the dimension 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 ensuring the safety performance of the battery 100 using the reinforcing element 30. For example, when the battery cell 20 (first battery cell 21) corresponding to the first flow path 34 expands, the dimensions of the first thermal conduction member, second thermal conduction member, and partition member of the first flow path 34 in the stacking direction (i.e., the first direction x) are reduced, but the first battery cell 21 does not affect the dimensions of the first thermal conduction plate 3331, second thermal conduction plate 3332, and partition member 335 of the second flow path 35 in the stacking direction, or has little effect on the dimensions of the first thermal conduction plate 3331, second thermal 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 with 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 thermal conduction member 3331, the second thermal conduction member 3332 and the partition member 335 of the second flow path 35 in the stacking direction are reduced, but the second battery cell 22 does not affect the dimensions of the first thermal conduction plate 3331, the second thermal conduction 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 thermal conduction plate 3331, the second thermal conduction 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 with the corresponding battery cell 20 (second battery cell 22).

[0434] Because the first flow path 34 and the second flow path 35 respectively correspond to two adjacent battery cells 20, they can independently withstand 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 or affect the expansion of the other battery cell 20, which is advantageous for dissipating the expansion of the two adjacent battery cells 20 and reduces the occurrence of early decompression of the battery cells 20 or serious thermal runaway accidents caused by the expansion of the 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 flow path 34 and the fluid medium in the second flow path 35 can exchange heat with the two adjacent battery cells 20, respectively, reducing the temperature difference between the two adjacent battery cells 20 and thereby ensuring the safety performance of the battery 100 using the reinforcing element 30.

[0435] The number of first flow paths 34 may be one or more, and the number of second flow paths 35 may be one or more. In some embodiments, there are multiple first flow paths 34 and / or multiple second flow paths 35.

[0436] The number of first flow paths 34 may be plural and the number of second flow paths 35 may be one, the number of first flow paths 34 may be one and the number of second flow paths 35 may be plural, or the number of first flow paths 34 may be plural and the number of second flow paths 35 may be plural. In an embodiment in which there are plural first flow paths 34, the first heat conduction plate 3331 and the partition member 33 5 together define a plurality of first flow paths 34, which are arranged in sequence along the third direction z, and each first flow path 34 extends along the second direction y. The third direction z is perpendicular to the second direction y. In an embodiment in which there are a plurality of second flow paths 35, the second heat conduction plate 3332 and the partition member 33 together define a plurality of second flow paths 35, which are arranged in sequence along the third direction z, and each second flow path 35 extends along the second direction y.

[0437] In another embodiment, the arrangement direction of the plurality of first flow paths 34 may be different from the arrangement direction of the plurality of second flow paths 35. The extension direction of the first flow paths 34 may be different from the extension direction of the second flow paths 35. Of course, the extension directions of the plurality of first flow paths 34 may be different, and the extension directions of the plurality of second flow paths 35 may also be different.

[0438] By having multiple first flow paths 34 and / or multiple second flow paths 35, the reinforcing element 30 can accommodate more fluid medium, which allows the fluid medium to be distributed more uniformly, which is advantageous for improving the heat exchange efficiency and uniformity of heat exchange, and reducing the temperature difference in different regions of the battery cell 20.

[0439] There are several methods for forming the first flow path 34, and in some embodiments, as shown in Figures 55 to 59, a first groove 3351 is formed in the partition member 335, and the first groove 3351 forms a part of the first flow path 34.

[0440] 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 being opposed to each other, and the first groove 3351 is disposed on the first surface 3352 and recessed in a direction approaching the second surface 3353. Furthermore, as shown in FIG. 58, for example, a first groove 3351 is provided on a first surface 3352, the first groove 3351 is recessed in a direction from the first surface 3352 toward the second surface 3353, and a first protrusion 3354 is formed at a position on the second surface 3353 corresponding to the first groove 3351.

[0441] The first groove 3351 penetrates at least one end of the partition member 335 in the second direction y. In this embodiment, the first groove 3351 penetrates both ends of the partition member 335 in the second direction y, allowing the fluid medium to flow into one end of the first flow path 34 in the second direction y and to flow out from the other end of the first flow path 34 in the second direction y.

[0442] The first groove 3351 installed in the partition member 335 forms part of the first flow path 34, and reduces the dimension 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 while ensuring a sufficient cross-sectional area of ​​the first flow path 34.

[0443] As shown in FIGS. 55 to 58, in some embodiments, the first heat conduction plate 3331 closes the groove opening of the first recessed groove 3351 facing the first heat conduction plate 3331 to form the first flow path .

[0444] In some embodiments, the side of the first heat conduction plate 3331 facing the partition member 335 abuts against the first surface 3352, whereby the first heat conduction plate 3331 closes the groove opening of the first groove 3351 facing the first heat conduction plate 3331 to form the first flow path 34; in other words, the first heat conduction plate 3331 forms another part of the first flow path 34. Therefore, in embodiments in which 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 is defined as a 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 is defined as another 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 the first surface 3352, and the surface of the first heat conduction plate 3331 facing the partition member 335 contacts the first surface 3352, but there may be no connection, or the surface of the first heat conduction plate 3331 facing the partition member 335 may be contact-connected to the first surface 3352 by welding or the like.

[0445] In another embodiment, when the first groove 3351 is not provided on the first surface 3352 and a gap exists 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 together define the first flow path 34.

[0446] The first heat conduction plate 3331 closes the groove opening of the first recessed groove 3351 facing the first heat conduction plate 3331, thereby forming the first flow path 34. 33 The arrangement of the first heat conduction plate 3331 and the partition member 335 in the stacking direction of the first heat conduction plate 3331, the second heat conduction plate 3332 and the partition member 335 becomes more compact. 33 5 reduces the dimension of the thermal management member 30 in the stacking direction.

[0447] In another embodiment, when the first groove 3351 is not provided 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 a 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 forms another part of the wall of the first flow path 34.

[0448] There are several methods for forming the second flow path 35, and in some embodiments, as shown in Figures 55 to 58, a second groove 3355 is formed in the partition member 33, and the second groove 3355 forms a part of the second flow path 35.

[0449] The phrase "the second groove 3355 forms a part of the second flow path 35" means that the groove wall of the second groove 3355 forms a part of the wall of the second flow path 35. The second groove 3355 has a variety of shapes. For example, as shown in FIG. 55, the second groove 3355 is disposed on the second surface 3353 along the stacking direction of the first heat conduction plate 3331, the second heat conduction plate 3332, and the partition member, and is recessed in a direction approaching the first surface 3352. Furthermore, as shown in FIG. 57, for example, the second groove 3355 is disposed on the second surface 3353, and is recessed in a direction approaching 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.

[0450] 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 flows through the second flow path 35 in the second direction. y and flows in from one end along the second flow path 35 in the second direction. y The flow can be allowed to flow out from the other end along the line.

[0451] The second groove 3355 installed in the partition member 335 forms part of the second flow path 35, and reduces the dimension 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 while ensuring a sufficient cross-sectional area of ​​the second flow path 35.

[0452] As shown in FIGS. 55 to 58, in some embodiments, the second heat conduction plate 3332 closes the groove opening of the second recessed groove 3355 facing the second heat conduction plate 3332 to form the second flow path 35.

[0453] In some embodiments, the side of the second heat conduction plate 3332 facing the partition member 335 abuts the second surface 3353, whereby the second heat conduction plate 3332 closes the groove opening of the second groove 3355 facing the second heat conduction plate 3332 to form the second flow path 35; in other words, the second heat conduction plate 3332 forms another part of the first flow path 34. Therefore, in embodiments in which the side of the second heat conduction plate 3332 facing the partition member 335 abuts the second surface 3353, the groove wall of the second groove 3355 is defined as a 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 is defined as another 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 the second surface 3353, and the surface of the second heat conduction plate 3332 facing the partition member 335 contacts the second surface 3353, but there may be no connection, or the surface of the second heat conduction plate 3332 facing the partition member 335 may be contact-connected to the second surface 3353 by welding or the like.

[0454] In another embodiment, when the second groove 3355 is not provided 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 together define the second flow path 35.

[0455] The second heat conduction plate 3332 blocks the groove opening of the second groove 3355 facing the second heat conduction plate 3332, thereby forming a second flow path 35, making the arrangement 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 reducing the dimension of the reinforcing element 30 in the stacking direction of the first heat conduction plate 3331, the second heat conduction plate 3332 and the partition member 335.

[0456] 55 to 58, in an embodiment in which there are multiple first flow paths 34, there are multiple first grooves 3351, and the multiple first grooves 3351 are arranged along the third direction z, which is perpendicular to the stacking direction of the first heat 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 the multiple first flow paths 34.

[0457] In an embodiment in which there are multiple second flow paths 35, there are multiple second grooves 3355, and the multiple second grooves 3355 are arranged along the third direction z, which is perpendicular to the stacking direction of the first heat 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 the multiple second flow paths 35.

[0458] Here, the partition member 335 has only a plurality of first grooves 3351 on the first surface 3352, and one second groove 3355 or no second grooves 3355 on the second surface 3353; alternatively, the partition member 335 has a plurality of second grooves 3355 on only the second surface 3353, and one first groove 3351 or no first grooves 3351 on the first surface 3352; alternatively, the partition member 335 has a plurality of first grooves 3351 on the first surface 3352 and a plurality of second grooves 3355 on the second surface 3353.

[0459] The first grooves 3351 may be multiple to form multiple first flow paths 34, and / or the second grooves 3355 may be multiple to form multiple second flow paths 35, thereby allowing the reinforcing element 30 to accommodate more fluid medium and distribute the fluid medium more uniformly, which is beneficial to improving the heat exchange efficiency and uniformity of heat exchange, and reducing the temperature difference in different regions of the battery cell 20.

[0460] 55 to 58, the first grooves 3351 and the second grooves 3355 are alternately arranged along the third direction z.

[0461] The phrase "the first grooves 3351 and the second grooves 3355 are alternately arranged in the third direction z" means that the first heat conduction plate 3331 and the second heat conduction plate 333 2 and along the stacking direction of the partition member 335, at least a part of the projection of each second groove 3355 on the first surface 3352 along the third direction z is located between two adjacent first grooves 3351, and / or the first heat conduction plate 3331, the second heat conduction plate 333 2 And along the stacking direction of the partition member 335, at least a portion of the projection of each first groove 3351 on the second surface 3353 along the third direction z is located between two adjacent second grooves 3355, meaning that the first flow paths 34 and the second flow paths 35 are arranged alternately in the third direction z.

[0462] 55 and 56 show a case where, along the stacking direction of the first heat conduction plate 3331, the second heat conduction plate 3332, and the partition member, the projections of each second groove 3355 on the first surface 3352 are all located between two adjacent first grooves 3351. Figs. 57 and 58 show a 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 of each second groove 3355 on the first surface 3352 along the third direction z is located between two adjacent first grooves 3351, and a portion of the projection of each second groove 3355 on the first surface 3352 along the third direction z overlaps with the first groove 3351.

[0463] The first grooves 3351 and the second grooves 3355 are arranged alternately along the third direction z, and the first flow paths 34 and the second flow paths 35 are arranged alternately along the third direction z. When the thermal management member 30 is positioned between two adjacent battery cells 20, the temperature distribution along the third direction z of the battery cell 20 corresponding to the first flow path 34 is uniform, and the temperature distribution along the third direction z of the battery cell 20 corresponding to the second flow path 35 is uniform.

[0464] 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.

[0465] In this embodiment, the first groove 3351 is disposed on the first surface 3352, the first groove 3351 is recessed from the first surface 3352 toward the second surface 3353, and a first protrusion 3354 is formed on the second surface 3353 at a position corresponding to the first groove 3351. The second groove 3355 is disposed on the second surface 3353, the second groove 3355 is recessed from the second surface 3353 toward the first surface 3352, and a second protrusion 3356 is formed on the first surface 3352 at a position corresponding to the second groove 3355. The first groove 3351 and the second groove 3355 are alternately arranged in the third direction z, and the first protrusions 3354 and the second protrusions 3356 are alternately arranged in the third direction z to form a corrugated plate.

[0466] In alternative embodiments, as shown in Figures 55 and 56, the partition member 335 may be a member of other structural configurations.

[0467] As shown in FIG. 60, the first flow path 34 may be formed using other forms, for example, in another embodiment, the partition member 335 includes a main body portion 3357 and a first partition portion 3358, and both ends of the first partition portion 3358 along the first direction x are connected to the main body portion 3357 and the first heat conduction plate 3331, respectively, and the main body portion 3357, the first partition portion 3358 and the first heat conduction plate 3331 together define the first flow path 34.

[0468] The main body 3357 and the first partitions 3358 are both flat plate structures, and define a first space between the main body 3357 and the first heat conduction plate 3331. The number of the first partitions 3358 may be one or more. In an embodiment in which there are multiple first partitions 3358, the multiple first partitions 3358 are arranged in a first direction. x The plurality of first partitions 3358 are spaced apart along the first space, and the plurality of first partitions 3358 divide the first space into a plurality of first sub-spaces, whereby the main body 3357, the first heat conduction plate 3331 and the plurality of first partitions 3358 together define a plurality of first flow paths 34. The main body 3357 and the first partitions 3358 may be integrally molded, for example, the main body 3357 and the first partitions 3358 are molded by an integral molding process such as injection molding or extrusion molding. The main body 3357 and the first partitions 3358 are installed separately, and soluble in They are connected together by means of connections, screws, etc.

[0469] The main body 3357, the first partition 3358 and the first heat conduction plate 3331 together define a plurality of first flow paths 34, and the reinforcing element 30 can accommodate more fluid medium, distribute the fluid medium more evenly, which is beneficial to improving the heat exchange efficiency and uniformity, reducing the temperature difference 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.

[0470] The second flow path 35 may also be formed using other forms. For example, referring to FIG. 13, the partition member 33 further includes a second partition portion 3359, and the second direction of the second partition portion 3359 y Both ends along the axis 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 .

[0471] The main body 3357 and the second partition 3359 are both flat plate structures, and define a second space between the main body 3357 and the second heat conduction plate 3332. The number of the second partition 3359 may be one or more. In an embodiment in which there are multiple second partitions 3359, the multiple second partitions 3359 are arranged in a first direction. x The second partitions 3359 are arranged at intervals along the second space 3357, and the plurality of second partitions 3359 divide the second space into a plurality of second sub-spaces, whereby the main body 3357, the second heat conduction plate 3332 and the plurality of second partitions 3359 together define a plurality of second flow paths 35. The main body 3357 and the second partitions 3359 may be integrally molded, for example, the main body 3357 and the first partitions 3359 are molded by an integral molding process such as injection molding or extrusion molding. The main body 3357 and the second partitions 3359 are installed separately, and soluble in They are connected together by means of a joint, a screw connection, etc. Furthermore, the main body portion 3357, the first partition portion 3358 and the second partition portion 3359 may be integrally molded.

[0472] The main body 3357, the second partition 3359 and the second heat conduction plate 3332 together define a plurality of second flow paths 35, and the reinforcing element 30 can accommodate more fluid medium and distribute the fluid medium more uniformly, which is advantageous to improve the heat exchange efficiency and the uniformity of the heat exchange, and reduce the temperature difference in different regions of the battery cell 20. 2 Heat Conduction Plate 333 2 3332. The second heat conduction plate 3332 can be supported by the support member 3332, and the deformation resistance of the second heat conduction plate 3332 can be enhanced.

[0473] The first flow path 34 and the second flow path 35 may extend along the same direction or different directions. In this embodiment, the extension direction of the first flow path 34 coincides with the extension direction of the second flow path 35. Both the first flow path 34 and the second flow path 35 extend along the second direction y, which makes manufacturing easy.

[0474] For the fluid medium flowing in the first flow path 34 and the second flow path 35, the heat exchange capacity between the fluid medium in the first flow path 34 and the corresponding battery cell 20 gradually decreases along the flow direction of the fluid medium, for example, when the reinforcing element 30 is used to cool the battery cell 20, the temperature of the fluid medium located in the first flow path 34 and the second flow path 35 gradually increases along the flow direction of the fluid medium, and the ability of the fluid medium with a high temperature to cool the battery cell 20 decreases.

[0475] Based on the above, in some embodiments, along the extension direction of the first flow path 34 and the second flow path 35, the first flow path 34 has a first inlet (not shown) and a first outlet (not shown), and the second flow path 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.

[0476] The first inlet allows the fluid medium to flow into the first flow path 34, the first outlet discharges the fluid medium from the first flow path 34, the second inlet allows the fluid medium to flow into the second flow path 35, and the second outlet discharges the fluid medium from the second flow path 35.

[0477] For example, as shown in FIG. 61 , in an embodiment in which a reinforcing element 30 is provided on both sides of a battery cell 20, one side of the battery cell 20 corresponds to the first flow path 34 of one reinforcing element 30, and the other side of the battery cell 20 corresponds to the second flow path 35 of another reinforcing element 30, and the fluid media on both sides of the battery cell 20 flow along opposite directions, and the heat exchange capabilities of the fluid media in the first flow path 34 and the fluid media in the second flow path 35 can complement each other along the extension direction of the first flow path 34 and the second flow path 35 (second direction y), thereby reducing the local temperature difference of the battery cell 20.

[0478] 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, i.e., the flow direction of the fluid medium in the first flow path 34 is opposite to the flow direction of the fluid medium in the second flow path 35, the heat exchange effect is higher in the area closer to the inlet of the corresponding flow path in the battery cell 20, and the heat exchange effect is lower in the area closer to the outlet of the corresponding flow path in the battery cell 20. This arrangement of the first flow path 34 and the second flow path 35 can reduce local differences in the thermal management of the battery cells 20 in the battery 100 and make the heat exchange more uniform.

[0479] As shown in FIG. 62, in some embodiments, the reinforcing element 30 includes a communicating cavity 36 located at one end of the partition member 335, the first flow path 34 communicating with the communicating cavity 36, and the second flow path 35 communicating with the communicating cavity 36.

[0480] The communication cavity 36 is located at one end of the partition member 335, and the partition member 335, the first heat conduction plate 3331, and the second heat conduction plate 3332 together define the communication cavity 36. In this embodiment, the communication cavity 36 is a 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.

[0481] In another embodiment, the communicating cavity 36 may be formed from other structures, for example, the reinforcing element 30 further includes a communicating tube, the first flow path 34 and the second flow path 35 are connected via the communicating tube, and the internal passage of the communicating tube is the communicating cavity 36.

[0482] The number of first flow paths 34 and the number of second flow paths 35 may both be plural. In an embodiment in which the number of first flow paths 34 is plural, all of the first flow paths 34 may be connected to the communicating cavities 36, and the fluid medium in each first flow path 34 is discharged by the first flow path 34 from the first outlet, passes through the communicating cavities 36, and flows into the second flow path 35 from the second inlet. In another embodiment, some of the multiple first flow paths 34 may be connected to the communicating cavities 36, and the fluid medium in these first flow paths 34 passes through the first outlet and the communicating cavities 36 before flowing into the second flow path 62 from the second inlet. Other parts of the multiple first flow paths 34 do not communicate with the communicating cavities 36, and the fluid medium in these first flow paths 34 cannot flow into the second flow path 35. The directions indicated by the white arrows in FIG. 62 are the flow directions of the fluid medium in the first flow paths 34 and the second flow paths 35.

[0483] In an embodiment in which there are a plurality of second flow paths 35, all of the second flow paths 35 may be in communication with the communicating cavities 36, and the fluid medium in the first flow paths 34 is discharged by the first flow paths 34 from the first outlet, passes through the communicating cavities 36, and then flows into each second flow path 35 from the second inlet. In another embodiment, some of the second flow paths 35 among the plurality of second flow paths 35 may be in communication with the communicating cavities 36, and the fluid medium in the first flow path 34 that is in communication with the communicating cavities 36 passes through the communicating cavities 36 and then flows from the second inlet into the second flow path 35 that is in communication with the communicating cavities 36, and some of the other second flow paths 35 among the plurality of second flow paths 35 are not in communication with the communicating cavities 36, and the fluid medium in the first flow paths 34 cannot flow into these second flow paths 35.

[0484] In this embodiment, the number of first flow paths 34 and the number of second flow paths 35 are both plural, and each of the first flow paths 34 and each of the second flow paths 35 communicates with a communication cavity 36 .

[0485] The number of first flow paths 34 and second flow paths 35 may be the same or different.

[0486] When the first flow path 34 is connected to the communication cavity 36 and the second flow path 35 is connected to the communication cavity 36, the fluid medium in the first flow path 34 can flow into the second flow path 35, and the fluid medium flowing out from the outlet (first outlet) of the first flow path 34 flows into the second flow path 35 from the inlet (second inlet) of the second flow path 35. This arrangement can reduce local differences in the thermal management of the battery cells 20 in the battery 100 and make heat exchange more uniform.

[0487] Referring to Figures 25, 26, 62 and 63, in some embodiments, the reinforcing element 30 includes a media inlet 3412 and a media outlet 3422, the media inlet 3412 communicating with the communicating cavity 36 via a first flow path 34, and the media outlet 3422 communicating with the communicating cavity 36 via a second flow path 35.

[0488] The medium inlet 3412 is located on the first heat conduction plate 3331 and communicates with the first flow path 34 , and the medium outlet 3422 is located on the second heat conduction plate 3332 and communicates with the second flow path 35 .

[0489] The fluid medium flows into the first flow path 34 from the medium inlet 3412, passes through the communicating cavity 36, flows into the second flow path 35, and is then discharged from the medium outlet 3422. As the fluid medium flows, it exchanges heat with the battery cells 20. The directions indicated by the white arrows in Figures 62 and 63 are both the flow directions of the fluid medium in the first flow path 34 and the second flow path 35.

[0490] By installing the medium inlet 3412 and the medium outlet 3422, the fluid medium can easily flow into the first flow path 34 and the second flow path 35, and the fluid medium can easily be discharged from the first flow path 34 and the second flow path 35 after heat exchange with the battery cell 20, so that the fluid medium that has not undergone heat exchange can flow into the first flow path 34 and the second flow path 35, ensuring the heat exchange capacity of the fluid medium in the first flow path 34 and the second flow path 35.

[0491] Referring to Figures 62 and 63, in some embodiments, along the extension direction of the first flow path 34, the medium inlet 3412 is located at one end of the first heat conduction plate 3331 away from the communicating cavity 36, and along the extension direction of the second flow path 35, the medium outlet 3422 is located at one end of the second heat conduction plate 3332 away from the communicating cavity 36.

[0492] The extension direction of the first flow path 34 and the extension direction of the second flow path 35 are both parallel to the second direction y. In another embodiment, the extension direction of the first flow path 34 may be different from the extension direction of the second flow path 35. For example, the extension direction of the first flow path 34 is parallel to the second direction y, and the extension direction of the second flow path 35 is parallel to a predetermined direction, and the predetermined direction and the second direction y The included angle with is an acute angle or the preset direction is perpendicular to the second direction y, and the preset direction is perpendicular to the first direction x.

[0493] A medium inlet pipe 37 is inserted into the medium inlet 3412, making it easy to connect the medium inlet 3412 to 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 to a device that recovers the fluid medium.

[0494] The medium inlet 3412 is located at one end of the first heat conduction plate 3331 away from the communicating cavity 36, and the medium outlet 3422 is located at one end of the second heat conduction plate 3332 away from the communicating cavity 36. The fluid medium flows from the medium inlet 3412 into the first flow path 34, then flows throughout the first flow path 34 along the extension direction of the first flow path 34, then flows into the second flow path 35, and then flows throughout the second flow path 35 along the extension direction of the second flow path 35 before being discharged from the medium outlet 3422. This ensures the longest flow path for the fluid medium within the thermal management member 30, allowing for sufficient heat exchange with the battery cells 20 and improving the heat exchange efficiency and uniformity.

[0495] As shown in Figures 62 and 63, in some embodiments, one end of the first flow path 34 that is away from the communicating cavity 36 along its extension direction and one end of the second flow path 35 that is away from the communicating cavity 36 along its extension direction are not connected to each other.

[0496] In this embodiment, the extension directions of the first flow passage 34 and the second flow passage 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 FIG. 63 , the reinforcing element 30 further includes a sealing member 39 (also referred to as a blocking member), which is disposed 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 flow passage 35 away from the communication cavity 36 along the second direction y, thereby preventing the fluid medium flowing into the first flow passage 34 from the medium inlet 3412 from flowing through the first flow passage 34 into the second flow passage 35 in a direction away from the communication cavity 36. Of course, in another embodiment, the sealing member 39 is disposed at one end of the partition member 335 away from the communication cavity 36 along the second direction y, and is disposed at one end of the partition member 335 away from the communication cavity 36 along the second direction y of the first flow passage 34. one end It can also be used to block the second flow path 35, thereby preventing the fluid medium flowing into the first flow path 34 from the medium inlet 3412 from flowing through the first flow path 34 in a direction away from the communicating cavity 36 into the second flow path 35.

[0497] The sealing member 39 and the partition member 335 may be installed separately, or the separately installed sealing member 39 and the partition member 335 may be connected to form an integral structure, for example, by welding, adhesive, etc. The sealing member 39 and the partition member 335 may be integrally molded, for example, by an integral molding process such as injection molding, pressing, etc.

[0498] 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 medium outlet 3422 on the partition member 353 is located on the side facing the communicating cavity 36 of the sealing member 39, thereby allowing the fluid medium in the second flow path 35 to be discharged from the medium inlet 3412.

[0499] The end of the first flow path 34 that is away from the communicating cavity 36 along its extension direction and the end of the second flow path 35 that is away from the communicating cavity 36 along its extension direction are not connected to each other, and when the fluid medium flows into the first flow path 34, it flows from the communicating cavity 36 into the second flow path 35 only after flowing through the entire first flow path 34, and is discharged from the medium outlet 3422 after flowing through the entire second flow path 35, thereby making the path along which the fluid medium flows within the thermal management member 30 the longest, allowing for sufficient heat exchange with the battery cells 20 and improving the heat exchange efficiency and uniformity.

[0500] In some embodiments, there are a plurality of first flow paths 34 and a plurality of second flow paths 35, and each of the first flow paths 34 and each of the second flow paths 35 communicates with a communication cavity 36.

[0501] In another embodiment, the number of first flow paths 34 may be one, the number of second flow paths 35 may be multiple, and each second flow path 35 may be connected to a communicating cavity 36, or the number of first flow paths 34 and the number of second flow paths 35 may be one, or the number of second flow paths 35 may be one, the number of first flow paths 34 may be multiple, and each first flow path 34 may be connected to a communicating cavity 36.

[0502] The first flow paths 34 and the second flow paths 35 are both multiple and all communicate with the communication cavities 36, the fluid medium of each first flow path 34 can flow into each second flow path 35, and the fluid medium flowing out from the outlet of the first flow path 34 flows into the second flow path 35 from the inlet of the second flow path 35, this arrangement can reduce local differences in the thermal management of the battery cells 20 in the battery 100 and make the heat exchange more uniform.

[0503] In embodiments where there are multiple first flow paths 34, the number of media inlets 3412 may be set differently; for example, referring to Figures 53 and 63, in some embodiments there is one media inlet 3412, and each first flow path 34 is connected to the connecting cavity 36 and the media inlet 3412.

[0504] 63 , in an embodiment in which the sealing member 39 closes one end of the second flow passage 35 remote from the communicating cavity 36, a flow-diversion gap 310 is formed between the side of the sealing member 39 remote from the communicating 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 passage 34 through the flow-diversion gap 310. The fluid medium flowing in from the medium inlet 3412 enters the flow-diversion gap 310 and is further distributed from the flow-diversion gap 310 to each first flow passage 34.

[0505] Therefore, the single medium inlet 3412 allows the fluid medium to flow into each first flow path 34 synchronously, and the number of medium inlets 3412 installed on the first heat conduction plate 3331 is small, which reduces the impact of installing the medium inlets 3412 on the structural strength of the first heat conduction plate 3331. Supplementary The structure of the stiffening element 30 is simpler and easier to manufacture.

[0506] In another embodiment, there are multiple media inlets 3412 , and each first flow passage 34 communicates with the communication cavity 36 and one media inlet 3412 .

[0507] The number of the medium inlets 3412 is the same as the number of the first flow paths 34, and they correspond one-to-one. Each medium inlet 3412 allows the fluid medium to flow into the corresponding first flow path 34, making it easy to independently control the inflow of the fluid medium into each first flow path 34 and to control the fluid medium to flow into the required first flow path 34 according to actual requirements, thereby controlling the distribution of the fluid medium inside the thermal adjustment tube and rationally controlling the temperature of the battery cell 20.

[0508] In an embodiment in which there are multiple second flow paths 35, there are multiple medium outlets 3422, and each second flow path 35 communicates with the communication cavity 36 and one medium outlet 3422, as shown in FIG.

[0509] There are multiple second flow paths 35 and multiple medium outlets 3422, and the medium outlets 3422 and the second flow paths 35 are installed in one-to-one correspondence, and the fluid medium in each second flow path 35 is discharged from the corresponding medium outlet 3422.

[0510] In another embodiment, there may be one medium outlet 3422, which is connected to each of the second flow paths 35, and the fluid medium in all of the second flow paths 35 is discharged from the medium outlet 3422.

[0511] Each second flow passage 35 communicates with the communication cavity 36 and one medium outlet 3422, so that the fluid medium can be quickly discharged from the second flow passage 35, improving the heat exchange efficiency.

[0512] In some embodiments, the partition member 335 is a unitary structure.

[0513] The partition member 335 may be a structure formed by a one-piece molding method such as pressing, injection molding, etc. In an embodiment where the partition member 335 is a corrugated plate, the corrugated plate is press-formed. The partition member 335 is a one-piece molded structure, which is easy to manufacture and has high structural strength.

[0514] In some embodiments, the first thermal conductive plate 3331 may be a one-piece molded structure, and the second thermal conductive plate 3332 may be a one-piece molded structure, for example, the first thermal conductive plate 3331 and the second thermal conductive plate 3332 are both formed by injection molding or press molding.

[0515] In some embodiments, the first thermally conductive plate 3331 is welded to the partition member 335 and / or the second thermally conductive plate 3332 is welded to the partition member 335 .

[0516] The first thermal conduction plate 3331 is welded to the partition member 335, and the second thermal conduction plate 3332 and the partition member 335 may be connected in other ways (for example, by adhesive), or the second thermal conduction plate 3332 may be in contact with the partition member 335 but not connected thereto. The second thermal conduction plate 3332 is welded to the partition member 335, and the first thermal conduction plate 3331 and the partition member 335 may be connected in other ways (for example, by adhesive), or the first thermal conduction plate 3331 may be in contact with the partition member 335 but not connected thereto. In this embodiment, both the first thermal conduction plate 3331 and the second thermal conduction plate 3332 are welded to the partition member 335.

[0517] partition Materials In an embodiment in which 335 is a corrugated plate, the first thermal conduction plate 3331 is welded to the second protrusion 3356, and the second thermal conduction plate 3332 is welded to the first protrusion 3354 (see FIG. 58). This connection method allows the partition member 335 to support the first thermal conduction plate 3331 and the second thermal conduction plate 3332, improving the ability of the first thermal conduction plate 3331 and the second thermal conduction plate 3332 to resist expansion and deformation of the battery cell 20.

[0518] The first heat conduction plate 3331 and the partition member 335 are welded together to improve the stability of the connection between the first heat conduction plate 3331 and the partition member 335, and the second heat conduction plate 3332 and the partition member 335 are welded together to improve the stability of the connection between the second heat conduction plate 3332 and the partition member 335.

[0519] As shown in FIG. 64, the battery 100 includes adjacent first battery cell 21, second battery cell 22 and reinforcing element 30, where the reinforcing element 30 is installed between the first battery cell 21 and the second battery cell 22, the first thermal conduction plate 3331 is thermally connected to the first battery cell 21, and the second thermal conduction plate 3332 is thermally connected to the second battery cell 22.

[0520] The fluid medium in the first flow path 34 and the fluid medium in the second flow path 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.

[0521] The expansion of the first battery cell 21 does not press the second flow path 35 corresponding to the second battery cell 22 to reduce its dimension or has little effect on the dimension of the second flow path 35 corresponding to the second battery cell 22, thereby ensuring the heat exchange capacity of the second flow path 35 corresponding to the second battery cell 22, and the expansion of the second battery cell 22 does not press the first flow path 34 corresponding to the first battery cell 21 to reduce its dimension or has little effect on the dimension of the first flow path 34 corresponding to the first battery cell 21, thereby ensuring the heat exchange capacity of the first flow path 34 corresponding to the first battery cell 21 and ensuring the safety performance of the battery 100 using the reinforcing element 30.

[0522] Furthermore, because 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, which is advantageous for dissipating the expansion of the first battery cell 21 and the second battery cell 22. This reduces the occurrence of early depressurization of the first battery cell 21 and the second battery cell 22 or serious thermal runaway accidents due to interference between the expansion of the first battery cell 21 and the second battery cell 22, and further improves the safety performance of the battery 100.

[0523] Continuing to refer to FIG. 64, in some embodiments, a reinforcing element 30 may be provided on the side of the first battery cell 21 away from the second battery cell 22, and a reinforcing member 30 may be provided on the side of the second battery cell 22 away from the first battery cell 21.

[0524] For ease of explanation, the reinforcing element 30 located between the first battery cell 21 and the second battery cell 22 is defined as the first reinforcing element, the reinforcing element 30 located on the side of the first battery cell 21 away from the second battery cell 22 is defined as the second reinforcing element, and the reinforcing element 30 located on the side of the second battery cell 22 away from the first battery cell 21 is defined as the third reinforcing element.

[0525] The fluid medium in the first channel 34 of the first reinforcing element has an opposite flow direction to the fluid medium in the second channel 35. The fluid medium in the first channel 34 of the second reinforcing element has an opposite flow direction to the fluid medium in the second channel 35. The fluid medium in the first channel 34 of the third reinforcing element has an opposite flow direction to the fluid medium in the second channel 35.

[0526] The second heat conductive plate 3332 of the second reinforcing element is thermally 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 path 34 of the first reinforcing element is opposite to the direction of the reinforcing element 30 in the second flow path 35 of the second reinforcing element 21. This allows the heat exchange capabilities of the fluid medium located on both sides of the first battery cell 21 along the second direction y to be complementary, thereby reducing the local temperature difference of the first battery cell 21.

[0527] The first heat conductive plate 3331 of the third reinforcing element is thermally connected to the side of the second battery cell 22 away from the first battery cell, and the flow direction of the fluid medium in the second flow passage 35 of the first reinforcing element is opposite to the direction of the reinforcing element 30 of the first flow passage 34 of the third reinforcing element, thereby allowing the heat exchange capabilities of the fluid medium located on both sides of the second battery cell 22 along the second direction y to be complementary, thereby reducing the local temperature difference of the second battery cell 22.

[0528] In some embodiments, as shown in Figures 65 to 82, at least a portion of the reinforcing element 30 is configured to be deformable when subjected to pressure, thereby providing the reinforcing element 30 with a certain expansion space for the battery cell 20, which is advantageous in reducing the pressing force between the reinforcing element 30 and the battery cell 20.

[0529] In some embodiments, as shown in FIG. 65 , the reinforcing element 30 includes a heat exchange layer 400 and a compressible layer 500 that are stacked together. The heat exchange layer 400 can improve the heat exchange efficiency of the battery cell 20 and enhance the heat dissipation capability of the battery cell 20. The compressible layer 500 has a lower elastic modulus than the heat exchange layer 400. When the battery cell 20 is subjected to an expansion force, the compressible layer 500 deforms in 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, preventing the entire battery 100 from being significantly deformed. The compressible layer 500 is also advantageous for accommodating tolerances during battery assembly and is useful for maintaining a compact structure during installation and battery assembly.

[0530] The heat exchange layer 400 is a layered structure for exchanging heat with the battery cells 20. When the temperature of the battery cells 20 is higher than the temperature of the heat exchange layer 400, the heat of the battery cells 20 is conducted to the heat exchange layer 400, lowering the temperature of the battery cells 20; when the temperature of the battery cells 20 is lower than the heat exchange temperature, the heat of the heat exchange layer 400 is conducted to the battery cells 20, raising the temperature of the battery cells 20.

[0531] The compressible layer 500 is a layered structure that undergoes significant compressive deformation when subjected to an acting force.

[0532] Alternatively, when the compressible layer 500 receives a force acting along the stacking direction, the compressible layer 500 may be compressed along the stacking direction and may be significantly deformed.

[0533] The elastic modulus is a direct proportional relationship between the stress and strain of a material or structure in the stage of elastic deformation. Under the condition that the stress is the same in the stage of elastic deformation, the larger the elastic modulus, the smaller the deformation capacity of the material or structure, and the smaller the elastic modulus, the greater the deformation capacity of the material or structure.

[0534] The number of layers of the heat exchange layer 400 may be one or more, and the number of layers of the compressible layer 500 may also be one or more.

[0535] For example, as shown in FIG. 66, the reinforcing element 30 includes one heat exchange layer 400 and one compressible layer 500; as shown in FIG. 67, the reinforcing element 30 includes two heat exchange layers 400 and one compressible layer 500, with the compressible layer 500 positioned between the two heat exchange layers 400; and as shown in FIG. 68, the reinforcing element 30 includes one heat exchange layer 400 and two compressible layers 500, with the heat exchange layer 400 positioned between the two compressible layers 500.

[0536] In some embodiments, compressible layer 500 includes compressible cavities 501, which are voids that decrease in volume after compressible layer 500 is subjected to an applied force.

[0537] When the expansion force released by the battery cell 20 is applied, the gas in the compressible cavity 501 is compressed and the compressible layer 500 is deformed in the direction of the expansion force of the battery cell 20 .

[0538] In some embodiments, compressible cavity 501 is filled with a phase change material or an elastic material.

[0539] A phase change material is a material that can change its state of matter and provide latent heat when the temperature remains constant. The process of changing physical properties is called a phase change process, during which the phase change material absorbs or releases a large amount of latent heat.

[0540] An elastic material refers to a material with a low modulus of elasticity, which undergoes significant deformation under the action of the expansion force of the battery cells.

[0541] When a phase change material is filled in the compressible cavity 501, the thermal capacity of the battery can be improved, and the reinforcing element 30 can keep the battery cell 20 warm or absorb the heat of the battery cell 20. When an elastic material is filled in the compressible cavity 501, the elastic material has good elasticity, and when subjected to the expansion force released by the battery cell 20, the elastic material is compressed and the compressible layer 500 deforms along the acting direction of the expansion force of the battery cell 20, and rebounds after the expansion force disappears. The elastic material can also increase the supporting strength of the compressible layer 500.

[0542] Optionally, the resilient material comprises a rubber material.

[0543] In some embodiments, the heat exchange layer 400 includes a heat exchange cavity 401 (also referred to as the cavity 30a above) for containing a heat exchange medium. The heat exchange medium is a medium for exchanging heat with the battery cells, and is typically a liquid or the like that has a large specific heat capacity and can remain fluid at the operating temperature of the battery.

[0544] Optionally, the heat exchange cavity 401 may be sealed or open.

[0545] 69, a first support member 410 (also referred to as a reinforcing rib) is installed in the heat exchange cavity 401, and the first support member 410 is supported in the heat exchange cavity 401 to prevent the heat exchange cavity 401 from being deformed by pressure. The first support member 410 may be used to improve the strength of the heat exchange layer 400, thereby preventing the heat exchange layer 400 from being significantly deformed after receiving the expansion force released from the battery cells.

[0546] Optionally, the modulus of elasticity of the first support member 410 is greater than the modulus of elasticity of the compressible layer 500 .

[0547] Since the elastic modulus of the compressible layer 500 is smaller than that of the first support member 410, it is easily deformed. After the reinforcing element 30 is subjected to the expansion force released from the battery cell 20, the compressible layer 500 can be significantly deformed along the direction of the expansion force of the battery cell 20, while the heat exchange layer 400 is basically not deformed.

[0548] In some embodiments, the heat exchange layer 400 and the compressible layer 500 are arranged in a stack along a first direction, and the first support member 410 is supported within the heat exchange cavity 401 along the first direction x.

[0549] When the reinforcing element 30 is applied to a battery, the battery cell 20 is generally abutted against the reinforcing element 30 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 supported in the heat exchange cavity 401 along the first direction x can greatly improve the elastic modulus of the heat exchange layer 400. After the reinforcing element 30 is subjected to the expansion force in the first direction x released from the battery cell, the compressible layer 500 can be greatly deformed along the first direction x, and the heat exchange layer 400 is basically not deformed.

[0550] In some embodiments, referring to FIG. 67, a compressible layer 500 is placed within the heat exchange cavity 401 .

[0551] Both ends of the reinforcing element 30 along the stacking direction are heat exchange cavities 401, which can effectively improve the heat exchange efficiency of the battery cells on both ends of the reinforcing element 30 and keep the temperature of the entire battery at a low level.

[0552] In some embodiments, as shown in FIG. 70, a first connecting structure 420 (also referred to as the first reinforcing rib above) is further installed within the heat exchange cavity 401 to fix the compressible layer 500 within the heat exchange cavity 401.

[0553] The first connecting structure 420 is a structure whose two ends are respectively connected to the inner wall of the heat exchange cavity 401 and the outer wall of the compressible layer 500. The first connecting structure 420 can fix the compressible layer 500, thereby preventing the position of the compressible layer 500 relative to the heat exchange cavity 401 from changing.

[0554] Optionally, at least a portion of the first connection structures 420 is disposed in the heat exchange cavity 401 along the stacking direction. The first connection structures 420 can on the one hand fix the compressible layer 500, and on the other hand can be used to improve the strength of the heat exchange layer 400, thereby preventing the heat exchange layer 400 from being significantly deformed after being subjected to the expansion force released by the battery cells.

[0555] In some embodiments, a heat exchange space is defined between the outer wall of the compressible layer 500 and the inner wall of the heat exchange cavity 401, and the first connecting structure 420 is disposed in the heat exchange space and connects the heat exchange space to the inner wall of the compressible layer 500. Multiple The flow path 402 (also referred to as flow path 30c) is divided into two parts.

[0556] The plurality of channels 402 are advantageous in circulating the heat exchange medium within the heat exchange space, preventing the temperature of the reinforcing element 30 from becoming too high.

[0557] Optionally, a plurality of first connecting structures 420 are installed in the heat exchange cavity 401 .

[0558] Optionally, the modulus of elasticity of the first connecting structure 420 is greater than the modulus of elasticity of the compressible layer 500 .

[0559] In some embodiments, referring to Figures 71-74, the compressible layer 500 includes a first compressible tube 510, the heat exchange layer 400 includes a first heat exchange tube 430, and the first compressible tube 510 is embedded within the first heat exchange tube 430.

[0560] The first compressible tube 510 is a tubular structure that has a compressible cavity 501 therein and that deforms when compressed.

[0561] The first heat exchange tube 430 is a tubular structure having a heat exchange cavity 401 therein, and at least one first connecting structure 420 is installed within the heat exchange cavity 410, and the ends of the at least one first connecting structure 420 define a first mounting cavity 431 in which the first compressible tube 510 is installed.

[0562] The reinforcing element 30 of the present invention is configured by inserting the first compressible tube 510 and the first heat exchange tube 430, which is advantageous for molding the reinforcing element 30.

[0563] Optionally, after the first compressible tube 510 and the first heat exchange tube 430 are fitted together, the end of at least one first connecting structure 420 in the first heat exchange tube 430 abuts against the outer wall of the first compressible tube 510.

[0564] Optionally, after the reinforcing element 30 is installed in the battery, it has a third direction z corresponding to the height direction of the battery cell, and two first connection structures 420 extending along the third direction z are installed in the first heat exchange tube 430, and the two first connection structures 420 are respectively installed at both ends of the first heat exchange tube 430 along the third direction z.

[0565] Optionally, the first heat exchange tube 430 has two opposing first abutment surfaces 432 for abutting against the large surface of the battery cell, i.e., the first wall 201. The first abutment surfaces 432 can increase the contact area between the first heat exchange tube 430 and the battery cell, thereby improving the heat exchange ability of the reinforcing element 30 with the battery cell.

[0566] Optionally, the first compressible tube 510 has two opposing first mating surfaces 511 for mating with the large surface of the battery cell, i.e., the first wall 201. The battery cell generally expands and deforms along a direction perpendicular to the large surface, and the first mating surfaces 511 can deform under the action of the expansion force of the battery cell and absorb the expanded portion of the battery cell.

[0567] Optionally, in some embodiments, referring to FIG. 68, the heat exchange layer 400 is placed within a compressible cavity 501.

[0568] Both ends of the reinforcing element 30 in the stacking direction are heat exchange cavities 401, which can effectively improve the deformation ability of the reinforcing element 30. After receiving the expansion force released from the battery cells at both ends in the stacking direction, the reinforcing element 30 can effectively deform, thereby absorbing the expansion released by the battery cells.

[0569] In some embodiments, compressible layer 500 includes a thermally conductive wall, which defines compressible cavity 501 .

[0570] The heat conducting wall is a wall structure having a high heat conducting effect of the compressible layer 500 .

[0571] By way of example, the material of the thermally conductive wall may be thermally conductive silicone, metal, etc.

[0572] The outer wall of the compressible layer 500 is a heat-conducting wall, which effectively transfers the heat of the battery cells into the internal heat exchange layer 400 for heat exchange.

[0573] 75 to 78, in some embodiments, Fig. 75 is a schematic diagram of a center structure of a second heat exchange tube according to some embodiments of the present application, Fig. 76 is a schematic diagram of a structure of a second compressible tube according to some embodiments of the present application, Fig. 77 is a side view of the second compressible tube according to some embodiments of the present application, and Fig. 78 is a schematic diagram of a structure after the second compressible tube and the second heat exchange tube are assembled according to some embodiments of the present application. The compressible layer 500 includes a second compressible tube 520, and the heat exchange layer 400 includes a second heat exchange tube 440, and the second heat exchange tube 440 is fitted within the second compressible tube 520.

[0574] The second heat exchange tube 440 is a tubular structure having a heat exchange cavity 401 therein.

[0575] The second compressible tube 520 is a tubular structure having a compressible cavity 501 therein, and at least one second connecting structure 530 is installed within the compressible cavity 501, and the end of the at least one second connecting structure 530 defines a second mounting cavity 521 in which the second heat exchange tube 440 is installed.

[0576] The reinforcing element 30 of the present invention is configured by inserting the second compressible tube 520 and the second heat exchange tube 440 , which is advantageous for molding the reinforcing element 30 .

[0577] Optionally, after the second compressible tube 520 and the second heat exchange tube 440 are fitted together, the end of at least one second connecting structure 530 in the second compressible tube 520 abuts against the outer wall of the second heat exchange tube 440 .

[0578] Optionally, after the reinforcing element 30 is installed in the battery, it has a third direction z corresponding to the height direction of the battery cell, and two second connection structures 530 extending along the third direction z are installed in the second compressible tube 520, and the two second connection structures 530 are respectively installed at both ends of the second compressible tube 520 along the third direction z.

[0579] Optionally, the second compressible tube 520 has two opposing second mating surfaces 522 for abutting against the large surface, i.e., the first wall 201, of the battery cell 20. The second mating surfaces 522 can increase the contact area between the second compressible tube 520 and the battery cell 20, thereby improving the heat exchange ability of the reinforcing element 30 with the battery cell 20. In addition, the battery cell 20 generally expands and deforms along a direction perpendicular to the large surface, and the second mating surfaces 522 can deform under the action of the expansion force of the battery cell 20, and the expansion of the battery cell 20 can be prevented. absorb Ability have .

[0580] Optionally, the second heat exchange tube 440 has two opposing second abutment surfaces 441 for fitting to the large surface, i.e., the first wall 201, of the battery cell 20. The two second abutment surfaces 441 correspond to the two second fitting surfaces 522 and absorb the heat conducted from the two second fitting surfaces 522.

[0581] Optionally, a plurality of second support members 450 are installed inside the second heat exchange tube 440 .

[0582] The inner wall of the heat exchange cavity 401 defines a heat exchange space, and a plurality of second support members 450 are disposed within the heat exchange space and divide the heat exchange space into a plurality of flow paths 402 .

[0583] Optionally, the modulus of elasticity of the second support member 450 is greater than the modulus of elasticity of the compressible layer 500 .

[0584] In some embodiments, referring to Figures 65, 79 and 80, the reinforcing element 30 further includes a flow collecting member 106, which includes a flow cavity 1061, which is connected to the heat exchange cavity 401, and both the flow cavity 1061 and the heat exchange cavity 401 are sealed and isolated from the compressible cavity 501.

[0585] The flow collecting member 106 is a member that connects the heat exchange layer 400 and a container that stores the heat exchange medium.

[0586] The flow cavity 1061 is a cavity that communicates the heat exchange cavity 401 with a container that stores a heat exchange medium within the flow concentrating member 106 .

[0587] The flow collecting member 106 can be used to communicate with a container storing a heat exchange medium, allowing the heat exchange medium in the heat exchange cavity 401 to circulate, and the compressible cavity 501 and the heat exchange cavity 401 are not connected, preventing the heat exchange medium from flowing into the compressible cavity 501 and preventing the compressible cavity 501 from deforming due to the expansion force released from the battery cell 20 and causing the heat exchange medium to overflow.

[0588] Optionally, the flow collecting member 106 further includes a liquid port 1062 that communicates with the flow cavity 1061 .

[0589] Optionally, the reinforcing element 30 includes one flow collecting member 106, which is installed at one end of the heat exchange layer 400, one end of the heat exchange layer 400 is open, and the flow cavity 1061 is connected to the heat exchange cavity 401 through the opening at one end.

[0590] Optionally, the reinforcing element 30 includes two flow collecting members 106, which are respectively installed at both ends of the heat exchange layer 400, both ends of the heat exchange layer 400 being open, and the two flow cavities 1061 are respectively connected to the heat exchange cavity 401 through the openings at both ends.

[0591] Optionally, the reinforcing element 30 further includes a connecting member, which is a hollow structure, and the opening at one end of the connecting member is sealedly connected to the liquid inlet / outlet port 1062 .

[0592] 64 and 84, and FIG. 81 is a structural schematic diagram of the reinforcing element 30 according to some embodiments of the present application after assembly with the battery cell 20. When the reinforcing element 30 is applied to the battery 100, the reinforcing element 30 may be placed between two adjacent battery cells 20, and two opposing surfaces of the reinforcing element 30 may abut against two adjacent large surfaces of the two adjacent battery cells 20, respectively, and the reinforcing element 30 may be placed between the housing 10 and the battery cell 20 closest to the housing 10.

[0593] Each reinforcement element 30 may be connected independently to a vessel storing the heat exchange medium, or the liquid inlets 1062 of adjacent reinforcement elements 30 may be connected via piping 107 .

[0594] In some embodiments, referring to FIGS. 65 and 82, the heat exchange layer 400 and the compressible layer 500 are y and the compressible layer 500 is arranged to extend along the second direction y At least one end along the length of the heat exchange layer 400 protrudes from the heat exchange layer 400 .

[0595] The compressible layer 500 protruding from the heat exchange layer 400 is advantageous in that the flow cavity 1061 of the flow collecting member 106 is sealed and isolated from the compressible cavity 501, so that the heat exchange medium does not flow into the compressible cavity 501, and the compressible cavity 501 is prevented from being deformed by the expansion force released from the battery cell, causing the heat exchange medium to overflow.

[0596] Optionally, the compressible layer 500 is installed in the heat exchange cavity 401, the flow concentrating member 106 includes a through-hole extending along the second direction y, the portion of the compressible layer 500 protruding from the heat exchange layer 400 passes through the through-hole and is sealedly connected to one end of the through-hole, and the other end of the through-hole is sealedly connected to the outer wall of the heat exchange layer 400. A flow cavity 1061 is defined between the outer wall of the portion of the compressible layer 500 protruding from the heat exchange layer 400 and the inner wall of the flow concentrating member 106.

[0597] In some embodiments, optionally, referring to FIG. 65, compressible cavity 501 is provided with an inlet 502 and an outlet 503 .

[0598] The compressible layer 500 allows for air cooling via the inlet 502 and outlet 503 and in combination with the heat exchange layer 400 further improves the heat exchange efficiency of the reinforcing element 30 to the battery.

[0599] In some embodiments, as shown in Figures 83 to 92, the reinforcing element 30 includes an outer case 50 and a support member 60, the support member 60 is housed within the outer case 50 and is used to define a cavity 30a and a deformation cavity 40a spaced apart within the outer case 50, the cavity 30a is used to allow the heat exchange medium to flow, and the deformation cavity 40a is arranged so that it can deform when the outer case 50 is subjected to pressure.

[0600] As a result, the battery cells 20 are heated or cooled through the heat exchange medium in the cavity 30a, and when the battery cells 20 inside the housing 10 expand during use, the outer case 50 has a deformation cavity 40a inside, so that the outer case 50 can deform when subjected to the force of the battery cells 20, preventing the reaction force of the outer case 50 of the reinforcing element 30 against the battery cells 20 from being too large, and facilitating the assembly of the battery cells 20. Teko The difference is absorbed, the battery cell 20 is prevented from being damaged, the reduction in the heat exchange area between the reinforcing element 30 and the battery cell 20 is reduced, and the cycle characteristics of the battery cell 20 are improved.

[0601] The reinforcing element 30 may be placed on the bottom or side of the housing, so as to be in full contact with the battery cells 20, or placed between two adjacent battery cells 20.

[0602] Both ends of the cavity 30a are open, allowing the heat exchange medium to flow through, providing the cavity 30a with a certain strength and generally preventing compressive deformation. Both ends of the deformation cavity 40a are sealed, preventing the heat exchange medium from flowing into the deformation cavity 40a. The volume ratio of the deformation cavity 40a is 10% to 90%, making it prone to deformation. The outer case 50 and the support member 60 may be manufactured using the same material in a one-piece molding process, or the outer case 50 may be manufactured using a material with greater elasticity than the support member 60, allowing the deformation cavity 40a to deform when the outer case 50 is subjected to the expansion force of the battery cells 20.

[0603] Optionally, the battery cell 20 is positioned between two adjacent reinforcing elements 30, and multiple reinforcing elements 30 are connected via connecting pipes, thereby realizing connection between each reinforcing element 30 and circulation of the heat exchange medium.

[0604] In some embodiments, a cavity 30a is formed by being surrounded by the support member 60 and the outer case 50. The support member 60 may be connected to the case 50 to form the cavity 30a, and the number of cavities 30a may be multiple, and the multiple cavities 30a may be installed adjacent to each other or spaced apart, thereby providing sufficient heat exchange for the battery cells 20.

[0605] In the above solution, the outer case 50 is positioned so as to be in direct contact with the battery cell 20, and a cavity 30a is formed surrounded by the support member 60 and the outer case 50, allowing the heat exchange medium to come into contact with the battery cell 20 through the outer case 50, improving the heat exchange efficiency of the battery cell 20.

[0606] As shown in Figures 86 and 88, the support member 60 includes a partition assembly 61 and a support assembly 62, the partition assembly 61 being used to define a cavity 30a and a deformation cavity 40a spaced apart within the outer case 50, and the support assembly 62 being installed within the cavity 30a or used to define the cavity 30a together with the partition assembly 61, thereby supporting the cavity 30a.

[0607] The partition assembly 61 is connected to the support assembly 62 and to the outer case 50, respectively, to define the cavity 30a and the deformation cavity 40a. The support assembly 62 may be installed inside the cavity 30a to support the cavity 30a, or the support assembly 62 may be connected to the outer case 50 and the partition assembly 61 as a side of the cavity 30a, to surround and form the cavity 30a, and to provide support for the cavity 30a.

[0608] In the above solution, the interior of the outer case 50 is divided into a cavity 30a and a deformed cavity 40a by a partition assembly 61, and the cavity 30a is supported by a support assembly 62, thereby improving the strength of the cavity 30a, preventing the internal volume of the cavity 30a from decreasing when the reinforcing element 30 absorbs expansion and tolerances, and preventing the heat exchange medium from overflowing due to changes in the flow rate of the heat exchange medium inside the cavity 30a, so that the cavity 30a will not be crushed and blocked at the end of the battery's life cycle.

[0609] The outer case 50 includes a first side wall 50a (e.g., also referred to as the above-mentioned first thermal conduction plate 3331) and a second side wall 50b (e.g., also referred to as the above-mentioned second thermal conduction plate 3332), and the first direction x (which may be the thickness direction of the reinforcing element 30) of the second side wall 50b is installed opposite the first side wall 50a, and the partition assembly 61 is respectively connected to the first side wall 50a and the second side wall 50b.

[0610] The first side wall 50a and the second side wall 50b may be arranged as the side wall with the largest area of ​​the reinforcing element 30, and the reinforcing element 30 may be installed on the bottom or side of the housing 10, with the first side wall 50a or the second side wall 50b contacting the battery cells 20 and thereby providing sufficient heat exchange with the battery cells 20, and the reinforcing element 30 may further be installed between two adjacent battery cells 20, with the first side wall 50a and the second side wall 50b respectively contacting the two adjacent battery cells 20 and thereby providing heat exchange with the different battery cells 20 and improving the heat exchange efficiency of the battery.

[0611] In the above solution, the partition assembly 61 (for example, also referred to as the above-mentioned first reinforcing rib) is connected to the first side wall 50a and the second side wall 50b, respectively, which can reinforce the connection strength of the first side wall 50a and the second side wall 50b, thereby improving the overall strength of the reinforcing element 30.

[0612] As shown in Figures 89 and 90, the partition assembly 61 includes a first folded plate 611 and a second folded plate 612, where the first folded plate 611 is connected to the first side wall 50a and the second folded plate 612 is connected to the second side wall 50b, and the first folded plate 611 and the second folded plate 612 define the deformation cavity 40a.

[0613] The first bending plate 611 may be connected to the first side wall 50a and define a deformation cavity 40a adjacent to the first side wall 50a, and the second bending plate 612 may be connected to the second side wall 50b and define a deformation cavity 40a adjacent to the second side wall 50b, or the deformation cavity 40a may be formed between the first bending plate 611 and the second bending plate 612.

[0614] In the above solution, the first bending plate 611 and the second bending plate 612 both have a bending shape, and the first bending plate 611 and the second bending plate 612 can define a large deformation cavity 40a, which ensures the deformation space of the reinforcing element 30 and improves the space utilization rate inside the outer case 50.

[0615] In some embodiments, the support assembly 62 includes a first support rib 621 and a second support rib 622, where the first support rib 621 is connected to the first folding plate 611 and the second side wall 50b, respectively, and the second support rib 622 is connected to the second folding plate 612 and the first side wall 50a, respectively.

[0616] The first support rib 621 and the second support rib 622 may be located within the cavity 30a or on the side of the cavity 30a, both of which can support the cavity 30a. The first support rib 621 improves the connection strength between the first bent plate 611 and the outer casing 50, and the second support rib 622 improves the connection strength between the second bent plate 612 and the outer casing 50. Both the first support rib 621 and the second support rib 622 improve the strength of the cavity 30a. When the reinforcing element 30 is compressed by the expansion force of the battery cells 20, the first support rib 621 and the second support rib 622 can prevent the cavity 30a from deforming. This ensures that the internal volume of the cavity 30a does not change and the heat exchange medium does not overflow. At the same time, this prevents the cavity 30a from being crushed and blocked at the end of the battery's life cycle, which would result in the loss of thermal performance.

[0617] In the embodiment shown in Figures 90 and 91, both ends of the first bending plate 611 are connected to the first side wall 50a, and both ends of the second bending plate 612 are connected to the second side wall 50b. In the first direction X, the first bending plate 611 and the second bending plate 612 are installed with a staggered position, and a cavity 30a is formed between the first support rib 621 and the second support rib 622.

[0618] The first bending plate 611 is connected to the first side wall 50a to form a deformation cavity 40a adjacent to the first side wall 50a, and the second bending plate 612 is connected to the second side wall 50b to form a deformation cavity 40a adjacent to the second side wall 50b, with the cavity 30a located between the two deformation cavities 40a. The cavities 30a are adjacent to each other, and the first support rib 621 and the second support rib 622 support the cavities 30a together, improving the strength of the cavities 30a. The first side wall 50a and the second side wall 50b may be used to contact two adjacent battery cells 20, respectively, and the positions of the first side wall 50a and the second side wall 50b corresponding to the deformation cavities 40a can both be deformed, allowing the reinforcing element 30 to simultaneously absorb the expan...

Claims

1. a housing, at least two battery cells, and a reinforcement element; the housing has an accommodating cavity, the at least two battery cells are accommodated in the accommodating cavity, each of the battery cells includes an electrode assembly and an electrode terminal, the electrode assembly is electrically connected to the electrode terminal, the battery cell includes a first wall, the first wall is the wall with the largest area in the battery cell, the reinforcing element is connected to the at least two battery cells, and the reinforcing element is thermally connected to the first walls of the at least two battery cells; the reinforcing element is a heat-conducting member, and the heat-conducting member is used for heat exchange with the battery cell; A battery wherein a cavity is disposed inside the thermally conductive member.

2. The battery of claim 1 , wherein the reinforcing element is adhered to the first walls of at least two of the battery cells via a first adhesive layer.

3. 3. The battery of claim 2, wherein the bottom of the reinforcing element is adhered to the bottom wall of the accommodating cavity via a second adhesive layer, and / or the bottom of the battery cell is adhered to the bottom wall of the accommodating cavity via a third adhesive layer.

4. 4. The battery of claim 3, 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.

5. The battery of claim 3 , wherein the thermal conductivity of the first adhesive layer is greater than or equal to the thermal conductivity of the second adhesive layer, and / or the thermal conductivity of the first adhesive layer is greater than or equal to the thermal conductivity of the third adhesive layer.

6. 4. The battery of claim 3, wherein a ratio between a thickness of the first adhesive layer and a thermal conductivity of the first adhesive layer is a first ratio, a ratio between a thickness of the second adhesive layer and a thermal conductivity of the second adhesive layer is a second ratio, a ratio between a thickness of the third adhesive layer and a thermal conductivity of the third adhesive layer is a third ratio, and 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.

7. The battery of claim 1 , wherein the cavity is used to accommodate a heat exchange medium for regulating the temperature of the battery cell.

8. 2. The battery of claim 1, wherein the battery cells are multiple and arranged along a second direction, the reinforcing element includes a partition plate extending along the second direction and connected to the first wall of each battery cell in the multiple battery cells, and the second direction is parallel to the first wall.

9. The battery according to claim 8 , wherein the reinforcing element further comprises an insulating layer, and the insulating layer is used to insulate the first wall and the partition plate of the battery cell.

10. 9. The battery of claim 8, wherein in a third direction, a dimension H1 of the partition plate and a 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.

11. The battery of claim 8 , wherein a cavity is disposed within the divider.

12. The battery of claim 11 , wherein the cavity is used to accommodate a heat exchange medium for regulating the temperature of the battery cell.

13. 12. The battery of claim 11, wherein the cavity has a dimension W in a first direction, a capacity Q of the battery cell and the cavity dimension W satisfy 1.0 Ah / mm≦Q / W≦400 Ah / mm, and the first direction is perpendicular to the first wall.

14. 13. The battery of claim 12, wherein the partition plate further includes a pair of thermally conductive plates arranged opposite each other along a first direction, the cavity being arranged between the pair of thermally conductive plates, and the first direction being perpendicular to the first wall.

15. The battery according to claim 14 , wherein the partition plate further includes a reinforcing rib, the reinforcing rib being disposed between the pair of heat-conducting plates.

16. The battery of claim 15 , wherein the reinforcing rib is connected to at least one of the pair of thermally conductive plates.

17. 17. The battery of claim 16, wherein the reinforcing ribs include a first reinforcing rib, both ends of which are connected to the pair of thermal conduction plates, and the first reinforcing rib is installed at an angle to the first direction.

18. The battery of claim 17, wherein the angle between the first reinforcing rib and the first direction is in the range of 30° to 60°.

19. 18. The battery of claim 17, wherein the reinforcing rib further includes a second reinforcing rib, one end of the second reinforcing rib being connected to one of the pair of thermal conduction plates, and the other end of the second reinforcing rib being spaced apart from the other of the pair of thermal conduction plates.

20. 20. The battery of claim 19, wherein the second reinforcing rib extends along the first direction and protrudes from one of the pair of thermally conductive plates.

21. 20. The battery of claim 19, wherein the first reinforcing rib and the second reinforcing rib are spaced apart.

22. The battery according to claim 14 , wherein the thickness D of the heat conduction plate and the dimension W of the cavity in the first direction satisfy 0.01≦D / W≦25.

23. 13. The battery of claim 12, wherein the partition plate has a medium inlet and a medium outlet, the cavity communicates 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.

24. The battery of claim 1 , wherein at least a portion of the reinforcing element is configured to be deformable when subjected to pressure.

25. The battery according to claim 1 , wherein the reinforcing element is provided with a relief structure, and the relief structure is used to provide space for the battery cells to expand.

26. The battery according to claim 1 , wherein each of the battery cells further includes a battery case, the electrode assembly is housed in the battery case, a pressure reducing mechanism is provided in the battery case, and the pressure reducing mechanism is integrally formed with the battery case.

27. 27. The battery of claim 26, wherein the battery case includes an integrally molded non-weakened area and a weak area, a groove is provided in the battery case, the non-weakened area is formed around the groove, and the weak area is formed at the bottom of the groove, the weak area is arranged to break when the battery cell releases internal pressure, and the pressure reduction mechanism includes the weak area.

28. 2. The battery of claim 1, wherein the electrode assembly includes a positive electrode sheet and a negative electrode sheet, the positive electrode sheet and / or the negative electrode sheet includes a current collector and an active material layer, the current collector includes a 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.

29. The electrode assembly includes a positive electrode sheet, the positive electrode sheet including 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 including a positive electrode active material, the positive electrode active material having a core and a shell covering the core, the core being a ternary material, dLi ２ MnO ３ ・(1-d) LiMO ２ and LiMPO ４ wherein 0<d<1, M comprises one or more selected from Fe, Ni, Co, and Mn, the shell comprises a crystalline inorganic material, the crystalline inorganic material has a half width of a main peak measured by X-ray diffraction of 0 to 3°, and the crystalline inorganic material comprises one or more of a metal oxide and an inorganic salt.

30. The electrode assembly includes a positive electrode sheet, the positive electrode sheet including a positive electrode current collector and a positive electrode active material layer coated on a surface of the positive electrode current collector, the positive electrode active material layer including a positive electrode active material, and the positive electrode active material is LiMPO ４ wherein M includes Mn and a non-Mn element, and the non-Mn element is Condition 1: where 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; Condition 2: where U is a valence change voltage of the non-Mn element, 2V<U<5.5V; Condition 3: the chemical activity of the chemical bond formed by the non-Mn element and O is equal to or greater than the chemical activity of a P—O bond; 2. The battery according to claim 1, wherein at least one of the conditions 4 is satisfied, in which the highest value number of the non-Mn element is 6 or less.

31. 10. A power consuming device comprising the battery of claim 1 for supplying electrical energy thereto.

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