Batteries and electrical devices

Abstract

A battery and an electrical device are disclosed. The battery includes a housing, at least two battery cells, and a reinforcing member. The housing has a receiving cavity in which at least two battery cells are received. Each battery cell includes an electrode assembly and an electrode terminal. The electrode assembly and the electrode terminal are electrically connected. Each battery cell includes a first wall, which is the wall with the largest area in the battery cell. The reinforcing member is connected to the at least two battery cells and is thermally connected to the first wall of the at least two battery cells.

Description

[0001] Cross-references to related applications

[0002] This application is based on international patent applications PCT / CN2022 / 077152 and PCT / CN2022 / 077153 and PCT / CN2022 / 077151 and PCT / CN2022 / 077147, both filed on February 21, 2022. Patent applications, including PCT / CN2022 / 077149 (filed February 21, 2022), international patent applications, including PCT / CN2022 / 077150 (filed February 21, 2022), PCT / CN2022 / 098447 (filed June 13, 2022), and PCT / CN2022 / 098727 (filed June 14, 2022). International patent applications, including PCT / CN2022 / 099229 (filed June 16, 2022), PCT / CN2022 / 100488 (filed June 22, 2022), PCT / CN2022 / 100486 (filed June 22, 2022), and PCT / CN2022 / 111347 (filed August 10, 2022), are filed on June 16, 2022. The following applications are filed and priority is claimed: International Patent Application No. PCT / CN2022 / 099786, filed on June 20, 2022; International Patent Application No. PCT / CN2022 / 101392, filed on June 27, 2022; and International Patent Application No. PCT / CN2022 / 101395, filed on June 27, 2022. The entire contents of the aforementioned international patent applications are incorporated herein by reference. Technical Field

[0003] This application relates to battery technology, and more particularly to a battery and an electrical device. Background Technology

[0004] In recent years, new energy vehicles have made leaps and bounds in development. In the field of electric vehicles, power batteries, as the power source of electric vehicles, play an irreplaceable and important role.

[0005] Energy density is a crucial parameter in battery performance; however, improving energy density requires consideration of other battery performance parameters. Therefore, enhancing battery performance is a pressing technical challenge in battery technology. Summary of the Invention

[0006] This application aims to address at least one of the technical problems existing in the related art. To this end, this application proposes a battery that improves energy density while ensuring thermal conductivity within the battery, thereby enhancing battery performance.

[0007] This application also proposes an electrical device having the aforementioned battery.

[0008] A battery according to a first aspect of this application includes: a housing having a receiving cavity; at least two battery cells housed within the receiving cavity, each battery cell including an electrode assembly and an electrode terminal, the electrode assembly being electrically connected to the electrode terminal, each battery cell including a first wall, the first wall being the wall with the largest area among the battery cells; and a reinforcing member connected to the at least two battery cells, the reinforcing member being thermally connected to the first wall of the at least two battery cells.

[0009] According to the battery embodiments of this application, the housing that accommodates at least two battery cells does not need to be equipped with beams or other structures, which can maximize the space utilization inside the battery and thus improve the energy density of the battery; at the same time, the aforementioned reinforcing members can also ensure heat conduction in the battery.

[0010] In some embodiments, each of the battery cells further includes a second wall connected to the first wall, the first wall and the second wall being disposed intersecting each other, and the electrode terminals being disposed on the second wall.

[0011] In some embodiments, each of the battery cells includes two first walls and two second walls disposed opposite to each other, and the electrode terminals are configured to be at least two; at least two of the electrode terminals are disposed on the same second wall; or, each second wall is provided with at least one of the electrode terminals.

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

[0013] In some embodiments, at least two of the battery cells are arranged in a first direction, in which each of the battery cells has a first surface disposed opposite to the first wall, the first surface having a clearance groove, and the clearance groove of one of two adjacent battery cells being used to accommodate the electrode terminal of the other battery cell, the first direction being perpendicular to the first wall.

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

[0015] In some embodiments, a second wall is provided at both axial ends of the first wall, and at least one of the second walls is provided with the electrode terminal.

[0016] In some embodiments, one of the second walls has an exposed electrode terminal, the electrode assembly includes a positive electrode and a negative electrode, one of the positive electrode and the negative electrode is electrically connected to the electrode terminal, and the other of the positive electrode and the negative electrode is electrically connected to the first wall or the other second wall.

[0017] In some embodiments, at least one of the battery cells is a pouch cell.

[0018] In some embodiments, the battery cell further includes a pressure relief mechanism, which is disposed on the same wall as the electrode terminals of the battery cell.

[0019] In some embodiments, the battery cell further includes a pressure relief mechanism, which is disposed on two walls of the battery cell, respectively, along with the electrode terminals.

[0020] In some embodiments, the reinforcing member is bonded to the first wall of at least two of the battery cells by a first adhesive layer.

[0021] In some embodiments, the bottom of the reinforcing member is bonded to the bottom wall of the receiving cavity by a second adhesive layer; and / or, the bottom of the battery cell is bonded to the bottom wall of the receiving cavity by a third adhesive layer.

[0022] 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.

[0023] 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.

[0024] 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; wherein the first ratio is less than or equal to the second ratio; and / or, the first ratio is less than or equal to the third ratio.

[0025] In some embodiments, the reinforcing member is a thermally conductive member used for heat exchange with the battery cell.

[0026] In some embodiments, the heat-conducting element comprises metallic and / or non-metallic materials.

[0027] In some embodiments, the heat-conducting element includes a metal plate and an insulating layer, the insulating layer being disposed on the surface of the metal plate; or, the heat-conducting element is a non-metallic material plate.

[0028] In some embodiments, the heat-conducting component is provided with a cavity.

[0029] In some embodiments, the cavity is used to contain a heat exchange medium to regulate the temperature of the battery cell.

[0030] In some embodiments, there are multiple battery cells arranged along a second direction; the reinforcement includes a separator that extends along the second direction and is connected to the first wall of each of the multiple battery cells, the second direction being parallel to the first wall.

[0031] In some embodiments, the reinforcement further includes an insulating layer for insulating and isolating the first wall of the battery cell and the separator.

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

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

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

[0035] In some embodiments, the surface of the reinforcing member that is connected to the first wall is an insulating surface; wherein the dimension of the reinforcing member in a first direction is 0.1 mm to 100 mm, and the first direction is perpendicular to the first wall.

[0036] In some embodiments, in the third direction, the size H1 of the partition and the size H2 of the first wall satisfy: 0.1≤H1 / H2≤2, and the third direction is perpendicular to the second direction and parallel to the first wall.

[0037] In some embodiments, the partition has a cavity inside.

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

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

[0040] In some embodiments, the partition further includes a pair of heat-conducting plates disposed opposite each other along a first direction, the cavity being disposed between the pair of heat-conducting plates, the first direction being perpendicular to the first wall.

[0041] In some embodiments, the partition further includes reinforcing ribs disposed between the pair of heat-conducting plates.

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

[0043] In some embodiments, the reinforcing rib includes a first reinforcing rib, the two ends of which are respectively connected to the pair of heat-conducting plates, and the first reinforcing rib is inclined relative to the first direction.

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

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

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

[0047] In some embodiments, the first reinforcing rib and the second reinforcing rib are spaced apart.

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

[0049] In some embodiments, the partition has a medium inlet and a medium outlet, the cavity connects the medium inlet and the medium outlet, and the interior of the partition has a cavity that is disconnected from both the medium inlet and the medium outlet.

[0050] In some embodiments, the cavity is provided with a partition, which is used to divide the cavity into at least two flow channels.

[0051] In some embodiments, the reinforcing member includes a first heat-conducting plate, a second heat-conducting plate, and the separator stacked together, the separator being disposed between the first heat-conducting plate and the second heat-conducting plate, the first heat-conducting plate and the separator jointly defining a first flow channel, and the second heat-conducting plate and the separator jointly defining a second flow channel.

[0052] In some embodiments, at least a portion of the reinforcement is configured to deform under pressure.

[0053] In some embodiments, the reinforcing member includes: a heat exchange layer and a compressible layer arranged in layers; the elastic modulus of the compressible layer is less than the elastic modulus of the heat exchange layer.

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

[0055] In some embodiments, the reinforcement includes a housing and a support member, the support member being housed within the housing and defining a spaced cavity and a deformable cavity within the housing, the cavity being for the flow of a heat exchange medium, and the deformable cavity being configured to deform when the housing is under pressure.

[0056] In some embodiments, the reinforcement includes a housing and an isolation assembly, the isolation assembly being housed within and connected to the housing to form a cavity between the housing and the isolation assembly for the flow of a heat exchange medium, the isolation assembly being configured to deformable when the housing is compressed.

[0057] In some embodiments, the reinforcing member is provided with a clearance structure for providing space for the expansion of the battery cell.

[0058] In some embodiments, at least a portion of the avoidance structure is located between two adjacent battery cells and serves to provide space for the expansion of at least one of the battery cells.

[0059] In some embodiments, in a first direction, the reinforcing member includes a first heat-conducting plate and a second heat-conducting plate disposed opposite to each other, with a cavity provided between the first heat-conducting plate and the second heat-conducting plate for accommodating a heat exchange medium. Along the first direction, at least one of the first heat-conducting plate and the second heat-conducting plate is recessed toward the other to form the clearance structure. The first direction is perpendicular to the first wall.

[0060] In some embodiments, the housing is provided with battery packs, the number of which is two or more and arranged along a first direction, each battery pack including two or more battery cells arranged along a second direction, the second direction being perpendicular to the first direction, and the first direction being perpendicular to the first wall.

[0061] In some embodiments, the reinforcing member is sandwiched between two adjacent battery packs.

[0062] In some embodiments, the battery further includes a connecting pipe assembly, and the reinforcing member has a cavity for accommodating a heat exchange medium. The connecting pipe assembly is used to connect the cavities of two or more of the reinforcing members.

[0063] In some embodiments, the connecting pipe assembly includes a connecting channel, an inlet pipe, and an outlet pipe. Along the first direction, the cavities of two adjacent reinforcing members are connected through the connecting channel, and the inlet pipe and the outlet pipe are connected to the cavity of the same reinforcing member.

[0064] In some embodiments, each battery cell further includes a battery case, the electrode assembly is housed within the battery case, and the battery case is provided with a pressure relief mechanism integrally formed with the battery case.

[0065] In some embodiments, the battery case includes an integrally formed non-weak region and a weak region, the battery case is provided with a groove, the non-weak region is formed around the groove, the weak region is formed at the bottom of the groove, the weak region is configured to be destroyed when the internal pressure of the battery cell is released, and the pressure relief mechanism includes the weak region.

[0066] In some embodiments, the average grain size of the weak region is S1, and the average grain size of the non-weak region is S2, satisfying: 0.05≤S1 / S2≤0.9.

[0067] In some embodiments, the minimum thickness of the weak region is A1, which satisfies: 1≤A1 / S1≤100.

[0068] In some embodiments, the minimum thickness of the weak region is A1, and the hardness of the weak region is B1, satisfying: 5HBW / mm≤B1 / A1≤10000HBW / mm.

[0069] In some embodiments, the hardness of the weak area is B1, and the hardness of the non-weak area is B2, satisfying: 1 < B1 / B2 ≤ 5.

[0070] In some embodiments, the minimum thickness of the weak area is A1, and the minimum thickness of the non-weak area is A2, satisfying: 0.05≤A1 / A2≤0.95.

[0071] In some embodiments, the electrode assembly includes a positive electrode and a negative electrode, the positive electrode and / or the negative electrode including a current collector and an active material layer, the current collector including a support layer and a conductive layer, the support layer for supporting the conductive layer, and the conductive layer for supporting the active material layer.

[0072] In some embodiments, the conductive layer is disposed on at least one side of the support layer along the thickness direction of the support layer.

[0073] In some embodiments, the room-temperature thin-film resistance R of the conductive layer S Satisfies: 0.016Ω / □≤R S ≤420Ω / □.

[0074] 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.

[0075] In some embodiments, the material of the support layer includes one or more of polymeric materials and polymer-based composite materials.

[0076] In some embodiments, the thickness d1 of the support layer and the light transmittance k of the support layer satisfy the following conditions: when 12μm≤d1≤30μm, 30%≤k≤80%; or when 8μm≤d1<12μm, 40%≤k≤90%; or when 1μm≤d1<8μm, 50%≤k≤98%.

[0077] In some embodiments, the electrode assembly includes a positive electrode sheet, the positive electrode sheet includes a positive current collector and a positive active material layer coated on the surface of the positive current collector, the positive active material layer includes a positive active material, the positive active material has a core and a shell covering the core, the core includes at least one of ternary material, dLi2MnO3·(1-d)LiMO2 and LiMPO4, 0 < d < 1, the M includes one or more selected from Fe, Ni, Co and Mn, the shell contains crystalline inorganic matter, the full width at half maximum (FWHM) of the main peak of the crystalline inorganic matter measured by X-ray diffraction is 0-3°, the crystalline inorganic matter includes one or more selected from metal oxides and inorganic salts.

[0078] In some embodiments, the shell includes at least one of the metal oxide and the inorganic salt, and carbon.

[0079] In some embodiments, the electrode assembly includes a positive electrode sheet, the positive electrode sheet includes a positive electrode current collector and a positive electrode active material layer coated on the surface of the positive electrode current collector, the positive electrode active material layer includes a positive electrode active material, the positive electrode active material has LiMPO4, M includes Mn, and a non-Mn element, and the non-Mn element satisfies at least one of the following conditions: the ionic radius of the non-Mn element is a, the ionic radius of the manganese element is b, and |a - b| / b is not greater than 10%; the 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 not greater than 6.

[0080] In some embodiments, the non-Mn element includes one or both of a first doping element and a second doping element, the first doping element is a manganese-site doping, and the second doping element is a phosphorus-site doping.

[0081] In some embodiments, the first doping element satisfies at least one of the following conditions: the ionic radius of the first doping element is a, the ionic radius of the manganese element is b, and |a - b| / b is not greater than 10%; the valence change voltage of the first doping element is U, 2V < U < 5.5V.

[0082] In some embodiments, the second doping element satisfies at least one of the following conditions: the chemical activity of the chemical bond formed by the second doping element and O is not less than the chemical activity of the P - O bond; the highest valence of the second doping element is not greater than 6.

[0083] In some embodiments, the positive electrode active material further has a coating layer.

[0084] In some embodiments, the coating layer includes carbon.

[0085] In some embodiments, the carbon in the coating layer is a mixture of SP2-form carbon and SP3-form carbon.

[0086] In some embodiments, the molar ratio of the SP2-form carbon to the SP3-form carbon is any value within the range of 0.1 - 10.

[0087] An electrical device according to an embodiment of the second aspect of the present application includes a battery according to the above-mentioned first aspect embodiment of the present application, and the battery is used to provide electric energy.

[0088] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0089] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0090] Figure 1 This is a schematic diagram of an electrical device according to an embodiment of this application;

[0091] Figure 2 This is an exploded view of a battery according to an embodiment of this application;

[0092] Figure 3 This is an exploded view of a battery according to another embodiment of this application;

[0093] Figure 4 This is an exploded view of a battery cell according to an embodiment of this application;

[0094] Figure 5 yes Figure 4 A schematic diagram of the battery cell shown;

[0095] Figure 6 This is a schematic diagram of the arrangement of battery cells according to another embodiment of this application;

[0096] Figure 7 This is an exploded view of a battery according to an embodiment of this application;

[0097] Figure 8 yes Figure 7 The diagram shows the arrangement of the individual battery cells.

[0098] Figure 9 This is a schematic diagram of a battery cell according to an embodiment of this application;

[0099] Figure 10 This is a schematic diagram of a battery according to an embodiment of this application;

[0100] Figure 11 yes Figure 10 A schematic diagram of the heat-conducting component shown;

[0101] Figure 12 yes Figure 10 A schematic diagram of the heat-conducting component and multiple battery cells shown;

[0102] Figure 13 yes Figure 10 Another schematic diagram of the battery shown;

[0103] Figure 14This is a partial structural diagram of a battery according to one embodiment of this application;

[0104] Figure 15 yes Figure 14 Another schematic diagram of the battery shown;

[0105] Figure 16 yes Figure 14 The diagram shows the arrangement of the individual battery cells.

[0106] Figure 17 This is a partial structural schematic diagram of a battery according to an embodiment of this application;

[0107] Figure 18 yes Figure 17 Another schematic diagram of the battery shown;

[0108] Figure 19 yes Figure 17 Another schematic diagram of the battery shown;

[0109] Figure 20 This is a schematic diagram of a partial structure of a battery according to an embodiment of this application;

[0110] Figure 21 yes Figure 20 A schematic diagram of the thermal management components shown;

[0111] Figure 22 yes Figure 21 A cross-sectional view of the thermal management component shown;

[0112] Figure 23 yes Figure 22 An enlarged view of part A, shown in the center circle;

[0113] Figure 24 This is a cross-sectional view of a reinforcing member with an internal partition according to an embodiment of this application;

[0114] Figure 25 yes Figure 22 An enlarged view of section B, shown in the center circle;

[0115] Figure 26 yes Figure 22 Enlarged view of section C, shown in the center circle;

[0116] Figure 27 This is a cross-sectional view of a reinforcement according to an embodiment of this application;

[0117] Figure 28 yes Figure 27 Enlarged view of section D shown in the center circle;

[0118] Figure 29 yes Figure 27 An enlarged view of section E, shown in the center circle;

[0119] Figure 30 This is a partial structural schematic diagram of a battery according to an embodiment of this application;

[0120] Figure 31 yes Figure 30 A partial cross-sectional view of the battery shown;

[0121] Figure 32 yes Figure 31 Enlarged view of section F shown in the center circle;

[0122] Figure 33 These are schematic diagrams illustrating various structures of partitions according to some embodiments of this application;

[0123] Figure 34 This is an exploded view of a battery according to an embodiment of this application;

[0124] Figure 35 This is a schematic diagram of a battery according to an embodiment of this application.

[0125] Figure 36 yes Figure 35 A schematic diagram showing the connection between a single battery cell and a thermal management component;

[0126] Figure 37 yes Figure 36 Cross-sectional view along the AA direction;

[0127] Figure 38 yes Figure 37 A magnified view of section G, shown in the center circle;

[0128] Figure 39 This is a schematic diagram of a battery according to an embodiment of this application;

[0129] Figure 40 This is an exploded view of a battery according to an embodiment of this application;

[0130] Figure 41 This is an exploded view of a battery according to an embodiment of this application;

[0131] Figure 42 This is a schematic diagram of a battery according to an embodiment of this application;

[0132] Figure 43 yes Figure 42 Another schematic diagram of the battery shown;

[0133] Figure 44 yes Figure 42 Another schematic diagram of the battery shown;

[0134] Figure 45 yes Figure 44 Cross-sectional view along the BB direction;

[0135] Figure 46 This is a schematic diagram of a battery according to an embodiment of this application;

[0136] Figure 47 yes Figure 46 A schematic diagram of the reinforcing member shown;

[0137] Figure 48 yes Figure 47 A cross-sectional view of the main body plate shown;

[0138] Figure 49 yes Figure 47 Another cross-sectional view of the main body plate shown;

[0139] Figure 50 This is a cross-sectional view of the main body plate according to an embodiment of this application;

[0140] Figure 51 This is a cross-sectional view of the main body plate according to an embodiment of this application;

[0141] Figure 52 This is a schematic diagram of a reinforcing member according to an embodiment of this application;

[0142] Figure 53 This is a cross-sectional view of a reinforcement according to an embodiment of this application;

[0143] Figure 54 yes Figure 53 Another sectional view of the reinforcing member in the middle;

[0144] Figure 55 This is a cross-sectional view of a separator according to an embodiment of this application;

[0145] Figure 56 This is a cross-sectional view of a reinforcement according to an embodiment of this application;

[0146] Figure 57 This is a cross-sectional view of a separator according to an embodiment of this application;

[0147] Figure 58 This is a cross-sectional view of a reinforcement according to an embodiment of this application;

[0148] Figure 59 This is a schematic diagram of a separator according to an embodiment of this application;

[0149] Figure 60 This is a cross-sectional view of a reinforcement according to an embodiment of this application;

[0150] Figure 61 This is a cross-sectional view of a battery according to an embodiment of this application;

[0151] Figure 62 This is a cross-sectional view of a battery according to an embodiment of this application;

[0152] Figure 63 This is a cross-sectional view of a battery according to an embodiment of this application;

[0153] Figure 64 This is a cross-sectional view of a battery according to an embodiment of this application;

[0154] Figure 65 This is a schematic diagram of a reinforcing member according to an embodiment of this application;

[0155] Figure 66 This is a cross-sectional view of a reinforcement according to an embodiment of this application;

[0156] Figure 67 This is a cross-sectional view of a reinforcement according to an embodiment of this application;

[0157] Figure 68 This is a cross-sectional view of a reinforcement according to an embodiment of this application;

[0158] Figure 69 This is a cross-sectional view of a reinforcement according to an embodiment of this application;

[0159] Figure 70 This is a cross-sectional view of a reinforcement according to an embodiment of this application;

[0160] Figure 71 This is a schematic diagram of a compressible cavity according to an embodiment of this application;

[0161] Figure 72 This is a partial schematic diagram of a reinforcing member according to an embodiment of this application;

[0162] Figure 73 yes Figure 72 Another schematic diagram of the reinforcing member shown;

[0163] Figure 74 This is a schematic diagram of a reinforcing member according to an embodiment of this application;

[0164] Figure 75 This is a schematic diagram of a reinforcing member according to an embodiment of this application;

[0165] Figure 76 This is a schematic diagram of a reinforcing member according to an embodiment of this application;

[0166] Figure 77 This is a schematic diagram of a reinforcing member according to an embodiment of this application;

[0167] Figure 78 This is a schematic diagram of a reinforcing member according to an embodiment of this application;

[0168] Figure 79 This is an exploded view of a reinforcement according to an embodiment of this application;

[0169] Figure 80 yes Figure 79 A schematic diagram of the current collector element shown;

[0170] Figure 81 This is a schematic diagram of a battery according to an embodiment of this application;

[0171] Figure 82 This is a schematic diagram of a reinforcing member according to an embodiment of this application;

[0172] Figure 83 This is a schematic diagram of a reinforcing member according to an embodiment of this application;

[0173] Figure 84 yes Figure 83 Enlarged view of section H shown in the middle circle;

[0174] Figure 85 This is a schematic diagram of a battery according to an embodiment of this application;

[0175] Figure 86 This is a schematic diagram of a reinforcing member according to an embodiment of this application;

[0176] Figure 87 yes Figure 86 Another schematic diagram of the reinforcing member shown;

[0177] Figure 88 This is a schematic diagram of a reinforcing member according to an embodiment of this application;

[0178] Figure 89 yes Figure 87 An enlarged view of section I, shown in the center circle;

[0179] Figure 90 yes Figure 88 An enlarged view of section J, shown in the center circle;

[0180] Figure 91 yes Figure 90 Another schematic diagram of the central reinforcement component;

[0181] Figure 92 This is a schematic diagram of a reinforcing member according to an embodiment of this application;

[0182] Figure 93 This is a schematic diagram of a reinforcing member according to an embodiment of this application;

[0183] Figure 94 yes Figure 93 A magnified view of section K, shown in the center circle;

[0184] Figure 95 This is a schematic diagram of a reinforcing member according to an embodiment of this application;

[0185] Figure 96 yes Figure 95 An enlarged view of the L section shown in the center circle;

[0186] Figure 97 This is a partial schematic diagram of a reinforcing member according to an embodiment of this application;

[0187] Figure 98 This is a partial schematic diagram of a reinforcing member according to an embodiment of this application;

[0188] Figure 99 This is a schematic diagram of a reinforcing member according to an embodiment of this application;

[0189] Figure 100 This is a schematic diagram of a battery according to an embodiment of this application;

[0190] Figure 101 yes Figure 100 An exploded view of the battery shown;

[0191] Figure 102 This is a schematic diagram of a battery according to an embodiment of this application;

[0192] Figure 103 This is a schematic diagram of a reinforcing member according to an embodiment of this application;

[0193] Figure 104 This is a schematic diagram of a reinforcing member according to an embodiment of this application;

[0194] Figure 105 This is a schematic diagram of a reinforcing member according to an embodiment of this application;

[0195] Figure 106 This is a schematic diagram of a reinforcing member according to an embodiment of this application;

[0196] Figure 107 This is a schematic diagram of a battery according to an embodiment of this application;

[0197] Figure 108 This is a schematic diagram of a battery according to an embodiment of this application;

[0198] Figure 109 This is a schematic diagram of a battery according to an embodiment of this application;

[0199] Figure 110 This is a schematic diagram of a battery cell according to an embodiment of this application;

[0200] Figure 111 This is a schematic diagram of a battery according to an embodiment of this application;

[0201] Figure 112 This is a schematic diagram of a battery according to an embodiment of this application;

[0202] Figure 113 yes Figure 112 A schematic diagram of the reinforcing member shown;

[0203] Figure 114 This is a schematic diagram of a reinforcing member according to an embodiment of this application;

[0204] Figure 115 yes Figure 114 Another schematic diagram of the central reinforcement component;

[0205] Figure 116 Schematic diagrams of the casing provided for some embodiments of this application;

[0206] Figure 117 for Figure 116 The shown is a CC cross-sectional view of the casing;

[0207] Figure 118 for Figure 117 The grain diagram of the shell shown is a schematic diagram.

[0208] Figure 119 for Figure 117 A magnified view of a portion of the outer casing at point E;

[0209] Figure 120 Enlarged partial views of the casing provided for other embodiments of this application;

[0210] Figure 121 A schematic diagram of the structure of the housing provided for some embodiments of this application (showing the primary groove);

[0211] Figure 122 for Figure 121 The EE cross-sectional view of the casing shown;

[0212] Figure 123 A schematic diagram of the housing structure provided for some embodiments of this application (showing primary grooves);

[0213] Figure 124 for Figure 123 The FF cross-sectional view of the casing shown;

[0214] Figure 125 A schematic diagram of the housing structure provided for other embodiments of this application (showing primary grooves);

[0215] Figure 126 for Figure 125 The GG cross-sectional view of the casing shown;

[0216] Figure 127A schematic diagram of the structure of the housing provided for some embodiments of this application (showing two levels of grooves);

[0217] Figure 128 for Figure 127 The KK cross-sectional view of the casing shown;

[0218] Figure 129 A schematic diagram of the housing structure provided for some embodiments of this application (showing two levels of grooves);

[0219] Figure 130 for Figure 129 The MM cross-sectional view of the casing shown;

[0220] Figure 131 A schematic diagram of the housing structure provided for other embodiments of this application (showing two levels of grooves);

[0221] Figure 132 for Figure 131 The NN cross-sectional view of the outer casing shown;

[0222] Figure 133 Axonometric views of the housing provided for some embodiments of this application;

[0223] Figure 134 for Figure 133 The schematic diagram of the outer casing shown (showing the primary groove and the primary countersink);

[0224] Figure 135 for Figure 134 The shown is an OO cross-sectional view of the outer casing;

[0225] Figure 136 A schematic diagram of the housing structure provided for some embodiments of this application (showing primary grooves and primary countersinks);

[0226] Figure 137 for Figure 136 The PP cross-sectional view of the casing shown;

[0227] Figure 138 A schematic diagram of the housing structure provided for other embodiments of this application (showing primary grooves and primary countersinks);

[0228] Figure 139 for Figure 138 The QQ cross-sectional view of the outer casing component shown;

[0229] Figure 140 A schematic diagram of the housing structure provided for some embodiments of this application (showing a primary groove and a two-stage countersink);

[0230] Figure 141 for Figure 140 The RR sectional view of the housing component shown;

[0231] Figure 142 A schematic diagram of the housing structure provided for some embodiments of this application (showing a primary groove and a two-stage countersink);

[0232] Figure 143 for Figure 142 The SS cross-sectional view of the casing shown;

[0233] Figure 144 A schematic diagram of the structure of a housing component provided for other embodiments of this application (showing a primary groove and a two-stage countersink);

[0234] Figure 145 for Figure 144 The TT cross-sectional view of the casing shown;

[0235] Figure 146 Schematic diagrams of the casing provided for other embodiments of this application;

[0236] Figure 147 Grain diagrams (schematic diagrams) of the casing provided for other embodiments of this application;

[0237] Figure 148 This is a schematic diagram of the end cap structure provided in some embodiments of this application;

[0238] Figure 149 Schematic diagrams of the housing structure provided for some embodiments of this application;

[0239] Figure 150 Schematic diagrams of the housing structure provided for other embodiments of this application;

[0240] Figure 151 This is a schematic diagram of the structure of a battery cell provided in some embodiments of this application;

[0241] Figure 152 This is a schematic diagram of the positive electrode current collector according to a specific embodiment of this application;

[0242] Figure 153 This is a schematic diagram of the positive electrode current collector according to another specific embodiment of this application;

[0243] Figure 154 This is a schematic diagram of the negative electrode current collector according to a specific embodiment of this application;

[0244] Figure 155 This is a schematic diagram of the negative electrode current collector according to another specific embodiment of this application;

[0245] Figure 156 This is a schematic diagram of the structure of a positive electrode sheet according to a specific embodiment of this application;

[0246] Figure 157 This is a schematic diagram of the structure of a positive electrode sheet according to another specific embodiment of this application;

[0247] Figure 158 This is a schematic diagram of the structure of a negative electrode sheet according to a specific embodiment of this application;

[0248] Figure 159 This is a schematic diagram of the structure of a negative electrode sheet according to another specific embodiment of this application;

[0249] Figure 160 This is a schematic diagram of a single nail penetration test in this application;

[0250] Figure 161 The temperature change curves of lithium-ion battery #1 and lithium-ion battery #4 after a nail penetration test are shown.

[0251] Figure 162 The voltage change curves of lithium-ion battery #1 and lithium-ion battery #4 after a nail penetration test are shown.

[0252] Figure 163 X-ray diffraction (XRD) patterns of undoped LiMnPO4 and the positive electrode active material prepared in Example 2;

[0253] Figure 164 The image shows the X-ray energy dispersive spectroscopy (EDS) spectrum of the positive electrode active material prepared in Example 2.

[0254] Figure 165 This is a schematic diagram of the positive electrode active material with a core-shell structure described in this application;

[0255] Figure 166 This is a schematic diagram of a core-shell structured positive electrode active material according to an embodiment of this application;

[0256] Figure 167 Exploded views of batteries provided for some embodiments of this application;

[0257] Figure 168 for Figure 167 A schematic diagram of the bottom cover, frame, and reinforcement shown;

[0258] Figure 169 for Figure 168 An exploded view of the bottom cover and frame shown;

[0259] Figure 170 for Figure 168 A partial schematic diagram of the frame, reinforcement, and bottom cover shown;

[0260] Figure 171 For the Figure 170 A cross-sectional view of the U-shaped line in the middle;

[0261] Figure 172 For the Figure 170 A cross-sectional view of the VV line. Detailed Implementation

[0262] The embodiments of this application will be described in further detail below with reference to the accompanying drawings and examples. The detailed description of the following embodiments and the accompanying drawings are used to illustrate the principles of this application by way of example, but should not be used to limit the scope of this application, that is, this application is not limited to the described embodiments.

[0263] In the description of this application, it should be noted that, unless otherwise stated, all technical and scientific terms used have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used is for the purpose of describing specific embodiments only and is not intended to limit this application; the terms "comprising" and "having," and any variations thereof, in the specification, claims, and accompanying drawings of this application are intended to cover non-exclusive inclusion; "a plurality of" means two or more; the terms "upper," "lower," "left," "right," "inner," "outer," etc., indicating orientation or positional relationships are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. Furthermore, the terms "first," "second," "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance. "Vertical" is not strictly vertical, but within the allowable error range. "Parallel" is not strictly parallel, but within the allowable error range.

[0264] In this application, the reference to "embodiment" means that a specific feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a mutually exclusive, independent, or alternative embodiment. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described in this application can be combined with other embodiments.

[0265] The directional terms used in the following description refer to the directions shown in the figures and are not intended to limit the specific structure of this application. It should also be noted in the description of this application that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0266] In this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Unless otherwise specified, in this application, the term "or" is inclusive. For example, the phrase "A or B" means "A, B, or both A and B"; more specifically, any of the following conditions satisfies the condition "A or B": A is true (or exists) and B is false (or does not exist); or A is false (or does not exist) and B is true (or exists); or both A and B are true (or exist).

[0267] Unless otherwise specified, the terms "comprising" and "including" as used in this application can be open-ended or closed-ended. For example, "comprising" and "including" can mean that other components not listed may also be included, or that only the listed components may be included.

[0268] The "range" disclosed in this application is defined by a lower limit and an upper limit. A given range is defined by selecting a lower limit and an upper limit, which define the boundaries of the specific range. Ranges defined in this way may or may not include endpoints and can be arbitrarily combined; that is, any lower limit can be combined with any upper limit to form a range. Any lower limit can be combined with any upper limit to form an unspecified range; and any lower limit can be combined with other lower limits to form an unspecified range, just as any upper limit can be combined with any other upper limit to form an unspecified range. Furthermore, although not explicitly stated, every point or individual value between the endpoints of the range is included within that range. Therefore, each point or individual value can be combined as its own lower or upper limit with any other point or individual value or with other lower or upper limits to form an unspecified range.

[0269] For example, if ranges of 60-120 and 80-110 are listed for a specific parameter, it is understood that ranges of 60-110 and 80-120 are also expected. Furthermore, if the minimum range values ​​are listed as 1 and 2, and the maximum range values ​​are listed as 3, 4, and 5, then the following ranges are all expected: 1-3, 1-4, 1-5, 2-3, 2-4, and 2-5. In this application, unless otherwise stated, the numerical range “ab” represents a shortened representation of any combination of real numbers between a and b, where a and b are real numbers. For example, the numerical range “0-5” means that all real numbers between “0-5” have been listed herein; “0-5” is merely a shortened representation of these numerical combinations. Additionally, when a parameter is stated as an integer ≥ 2, it is equivalent to disclosing that the parameter is, for example, an integer 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, etc. In this application, “about” a numerical value represents a range, indicating a range of ±10% of that value.

[0270] Unless otherwise specified, all embodiments and optional embodiments of this application can be combined to form new technical solutions. Unless otherwise specified, all technical features and optional technical features of this application can be combined to form new technical solutions. Unless otherwise specified, all steps of this application can be performed sequentially or randomly, preferably sequentially. For example, if the method includes steps (a) and (b), it means that the method may include steps (a) and (b) performed sequentially, or it may include steps (b) and (a) performed sequentially. For example, if the method may also include step (c), it means that step (c) can be added to the method in any order. For example, the method may include steps (a), (b), and (c), or it may include steps (a), (c), and (b), or it may include steps (c), (a), and (b), etc.

[0271] It should be noted that, in this document, the terms "coating layer" and "coating" refer to a material layer coating a core material such as lithium manganese phosphate. This material layer may completely or partially coat the core. The use of "coating layer" is for ease of description only and is not intended to limit this application. Furthermore, each coating layer may be a complete or partial coating. Similarly, the term "coating layer thickness" refers to the thickness of the material layer coating the core in the radial direction of the core.

[0272] In this application, the battery cell may include lithium-ion secondary batteries, lithium-ion primary batteries, lithium-sulfur batteries, sodium-lithium-ion batteries, sodium-ion batteries, or magnesium-ion batteries, etc., and the embodiments of this application are not limited to these. The battery cell may be cylindrical, flat, cuboid, or other shapes, etc., and the embodiments of this application are not limited to these. Battery cells are generally divided into three types according to their packaging method: cylindrical battery cells, cuboid / square battery cells, and pouch battery cells, and the embodiments of this application are not limited to these.

[0273] The battery mentioned in the embodiments of this application refers to a single physical module comprising one or more battery cells to provide higher voltage and capacity. For example, the battery mentioned in this application may include a battery pack, etc. A battery generally includes a housing for encapsulating one or more battery cells. The housing can prevent liquids or other foreign matter from affecting the charging or discharging of the battery cells.

[0274] The housing 10 may include a first part 101 and a second part 102 (e.g., Figure 2 and Figure 3As shown, the first part 101 and the second part 102 overlap each other, and together they define a receiving space for accommodating the battery cell 20. The second part 102 can be a hollow structure with one open end, and the first part 101 can be a plate-like structure, overlapping the open side of the second part 102 to form a housing with a receiving space. Alternatively, both the first part 101 and the second part 102 can be hollow structures with one open side, overlapping the open side of the second part 102 to form a housing with a receiving space. Of course, the first part 101 and the second part 102 can be of various shapes, such as cylinders, cuboids, etc.

[0275] To improve the sealing performance after the first part 101 and the second part 102 are connected, a sealing element, such as sealant or sealing ring, can also be provided between the first part 101 and the second part 102.

[0276] A battery cell includes an electrode assembly and an electrolyte. The electrode assembly consists of a positive electrode, a negative electrode, and a separator. The battery cell primarily functions by the movement of metal ions between the positive and negative electrodes. The positive electrode includes a positive current collector and a positive active material layer. The positive active material layer is coated on the surface of the positive current collector, and the uncoated current collector protrudes beyond the coated current collector, serving as the positive electrode tab. Taking a lithium-ion battery as an example, the positive current collector can be made of aluminum, and the positive active material can be lithium cobalt oxide, lithium iron phosphate, ternary lithium, or lithium manganese oxide, etc. The negative electrode includes a negative current collector and a negative active material layer. The negative active material layer is coated on the surface of the negative current collector, and the uncoated current collector protrudes beyond the coated current collector, serving as the negative electrode tab. The negative current collector can be made of copper, and the negative active material can be carbon or silicon, etc. To ensure that a large current can pass through without melting, there are multiple positive electrode tabs stacked together, and there are multiple negative electrode tabs stacked together.

[0277] There are no particular limitations on the aforementioned separator membrane; any known porous structure separator membrane with electrochemical and chemical stability can be selected, such as a single-layer or multi-layer film of one or more of glass fiber, non-woven fabric, polyethylene, polypropylene, and polyvinylidene fluoride. The material of the separator membrane can be polypropylene (PP) or polyethylene (PE), etc. Furthermore, the electrode assembly can be a wound structure or a stacked structure; the embodiments of this application are not limited to these.

[0278] The electrolyte comprises an organic solvent and an electrolyte salt, wherein the electrolyte salt acts as a transporter of ions between the positive and negative electrodes, and the organic solvent serves as a medium for ion transport. The electrolyte salt can be one or more of the electrolyte salts known in the art for use in battery cells, such as LiPF6 (lithium hexafluorophosphate), LiBF4 (lithium tetrafluoroborate), LiClO4 (lithium perchlorate), LiAsF6 (lithium hexafluoroarsenate), LiFSI (lithium bis(fluorosulfonyl)imide), LiTFSI (lithium bis(trifluoromethanesulfonyl)imide), LiTFS (lithium trifluoromethanesulfonate), LiDFOB (lithium difluorooxalate borate), LiBOB (lithium dioxalate borate), LiPO2F2 (lithium difluorophosphate), LiDFOP (lithium difluorodioxalate phosphate), and LiTFOP (lithium tetrafluorooxalate phosphate). The organic solvent can be an organic solvent known in the art for use in battery cells, such as ethylene carbonate (EC) and propylene carbonate. The electrolyte may be selected from one or more of the following: ester (PC), methyl ethyl carbonate (EMC), diethyl carbonate (DEC), dimethyl carbonate (DMC), dipropyl carbonate (DPC), methyl propyl carbonate (MPC), ethyl propyl carbonate (EPC), butenyl 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), dimethyl sulfone (MSM), methyl ethyl sulfone (EMS), and diethyl sulfone (ESE), preferably two or more. Appropriate electrolyte salts and organic solvents may be selected according to actual needs.

[0279] Of course, a single battery cell may not necessarily include electrolyte.

[0280] To meet diverse power demands, a battery can comprise multiple individual cells, which can be connected in series, parallel, or a combination of both. Optionally, multiple individual cells can first be connected in series, parallel, or a combination to form a battery module, and then these battery modules can be connected in series, parallel, or a combination to form a battery. In other words, multiple individual cells can directly form a battery, or they can first be assembled into battery modules or battery packs, and then the battery modules can be assembled into a battery. The battery is then further installed in the electrical device to provide power to it.

[0281] The development of battery technology must consider multiple design factors simultaneously, such as energy density, cycle life, discharge capacity, charge / discharge rate, and safety. Among these, improving the utilization rate of the battery's internal space, given a fixed internal space, is an effective way to increase battery energy density. However, while improving the utilization rate of the battery's internal space, other battery parameters, such as thermal conductivity and thermal management, must also be considered. Furthermore, improving the utilization rate of the battery's internal space may reduce its structural strength. For example, beams are typically installed inside the battery casing to mount the battery modules. Additionally, the battery modules themselves also have side plates and end plates. These beams, side plates, and end plates, while securing the battery, also occupy internal space. However, without these beams, side plates, and end plates, the battery's structural strength would be insufficient, affecting its performance.

[0282] During battery charging and discharging, a significant amount of heat is generated, especially during fast charging, where individual battery cells produce substantial heat. This heat accumulates and multiplies, causing a rapid rise in battery temperature. If the heat from individual battery cells cannot dissipate in time, it can lead to thermal runaway, resulting in safety incidents such as smoke, fire, and explosion. Furthermore, prolonged and severe temperature unevenness can drastically reduce battery lifespan. Additionally, at very low temperatures, battery discharge efficiency is low, and the battery may even struggle to start at low temperatures, affecting normal battery operation. Therefore, ensuring adequate thermal management for batteries is crucial.

[0283] In view of this, this application provides a technical solution in which at least two battery cells are housed within the receiving cavity of a casing, and a reinforcing member is connected to the at least two battery cells. The reinforcing member is thermally connected to the first wall of the at least two battery cells, allowing it to conduct heat from the battery cells. This eliminates the need for beams or other structures in the middle of the battery casing and side panels within the battery, maximizing internal space utilization and thus increasing energy density. Simultaneously, the reinforcing member ensures proper heat conduction within the battery. Therefore, the technical solution of this application can improve battery energy density while ensuring proper heat conduction, thereby enhancing battery performance.

[0284] The technical solutions described in the embodiments of this application are applicable to various battery-powered devices, such as mobile phones, portable devices, laptops, electric vehicles, electric toys, power tools, electric vehicles, ships, and spacecraft. For example, spacecraft include airplanes, rockets, space shuttles, and spacecraft.

[0285] It should be understood that the technical solutions described in the embodiments of this application are not limited to the devices described above, but can also be applied to all devices that use batteries. However, for the sake of brevity, the following embodiments are all illustrated using electric vehicles as examples.

[0286] For example, such as Figure 1 The diagram shown is a structural schematic of a vehicle 1000 according to one embodiment of this application. The vehicle 1000 can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. The vehicle 1000 may contain a motor 101, a controller 102, and a battery 100. The controller 102 controls the battery 100 to supply power to the motor 101. For example, the battery 100 can be located at the bottom, front, or rear of the vehicle 1000. The battery 100 can be used to power the vehicle 1000. For example, the battery 100 can serve as the operating power source for the vehicle 1000's electrical system, such as meeting the power requirements for starting, navigation, and operation. In another embodiment of this application, the battery 100 can not only serve as the operating power source for the vehicle 1000 but also as the driving power source, replacing or partially replacing gasoline or natural gas to provide driving power to the vehicle 1000.

[0287] To meet different power demands, battery 100 may include one or more individual battery cells 20. For example, such as Figure 2 and Figure 3 The diagram shown is a structural schematic of a battery 100 according to an embodiment of this application. The battery 100 may include multiple battery cells 20. The battery 100 may also include a housing 10, which has a hollow interior, and the multiple battery cells 20 are housed within the housing 10. For example, the multiple battery cells 20 may be connected in parallel, series, or a combination thereof and then placed inside the housing 10.

[0288] Optionally, the battery 100 may also include other structures, which will not be described in detail here. For example, the battery 100 may also include a busbar (not shown in the figure), which is used to realize the electrical connection between multiple battery cells 20, such as parallel, series, or mixed connection. Specifically, the busbar can realize the electrical connection between battery cells 20 by connecting the electrode terminals of the battery cells 20. Further, the busbar can be fixed to the electrode terminals of the battery cells 20 by welding. The electrical energy of the multiple battery cells 20 can be further led out through the housing by a conductive mechanism. Optionally, the conductive mechanism may also be part of the busbar.

[0289] Depending on different power demands, the number of battery cells 20 can be set to any value; for example, a single battery cell 20 can be used. Multiple battery cells 20 can be connected in series, parallel, or a combination thereof to achieve a larger capacity or power. Since each battery 100 may contain a large number of battery cells 20, for ease of installation, the battery cells 20 can be grouped, with each group of battery cells 20 forming a battery module. The number of battery cells 20 included in a battery module is unlimited and can be set according to requirements. A battery can include multiple battery modules, which can be connected in series, parallel, or a combination thereof.

[0290] like Figure 4 The diagram shown is a structural schematic of a battery cell 20 according to an embodiment of this 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 the outer shell or battery box 21 of the battery cell 20. The walls of the housing 211 and the cover plate 212 are both referred to as the walls of the battery cell 20. For a cuboid battery cell 20, the walls of the housing 211 include a bottom wall and four side walls. The shape of the housing 211 depends on the shape of the combined one or more electrode assemblies 22. For example, the housing 211 can be a hollow cuboid, cube, or cylinder, and one side of the housing 211 has an opening so that one or more electrode assemblies 22 can be placed inside the housing 211. The cover plate 212 closes to the opening of the housing 211 to isolate the internal environment of the battery cell 20 from the external environment. For example, when the housing 211 is a hollow cuboid or cube, one of its planes is an open surface, meaning this plane has no wall, allowing communication between the inside and outside of the housing 211. When the housing 211 can be a hollow cylinder, one end face of the housing 211 is an open surface, meaning this end face has no wall, allowing communication between the inside and outside of the housing 211. A cover plate 212 covers the opening and is connected to the housing 211 to form a closed cavity for housing the electrode assembly 22. The housing 211 is filled with an electrolyte, such as an electrolyte solution.

[0291] The battery cell 20 may also include two electrode terminals 214, which can be disposed on a cover plate 212. The cover plate 212 is typically flat, and the two electrode terminals 214 are fixed to the flat surface of the cover plate 212. The two electrode terminals 214 are a positive electrode terminal 214a and a negative electrode terminal 214b, respectively. Each electrode terminal 214 is provided with a corresponding connecting member 23, or a current collector, which 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 terminal 214.

[0292] like Figure 4As shown, each electrode assembly 22 has a first tab 221a and a second tab 222a. The first tab 221a and the second tab 222a have opposite polarities. For example, when the first tab 221a is a positive tab, the second tab 222a is a negative tab. The first tab 221a of one or more electrode assemblies 22 is connected to an electrode terminal via a 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 tab via a connecting member 23, and the negative electrode terminal 214b is connected to the negative tab via another connecting member 23.

[0293] In this battery cell 20, depending on actual usage requirements, the electrode assembly 22 can be configured as a single unit or multiple units, such as... Figure 4 As shown, the battery cell 20 contains four independent electrode assemblies 22.

[0294] A pressure relief mechanism 213 may also be provided on the battery cell 20. The pressure relief mechanism 213 is actuated to release the internal pressure or temperature when the internal pressure or temperature of the battery cell 20 reaches a threshold.

[0295] The pressure relief mechanism 213 can be any possible pressure relief structure, and the embodiments of this application are not limited to this. For example, the pressure relief mechanism 213 can be a temperature-sensitive pressure relief mechanism, which is configured to melt when the internal temperature of the battery cell 20 with the pressure relief mechanism 213 reaches a threshold; and / or, the pressure relief mechanism 213 can be a pressure-sensitive pressure relief mechanism, which is configured to rupture when the internal gas pressure of the battery cell 20 with the pressure relief mechanism 213 reaches a threshold.

[0296] Figure 10 A schematic diagram of the structure of a battery 100 according to an embodiment of this application is shown.

[0297] like Figure 10 As shown, the battery 100 includes a housing 10, at least two battery cells 20, and a reinforcing member 30. The housing 10 has a receiving cavity 10a, in which the at least two battery cells 20 are housed. Each battery cell 20 includes an electrode assembly 22 and an electrode terminal 214. The electrode assembly 22 and the electrode terminal 214 are electrically connected to each other so that the battery cell 20 can be used to provide electrical energy. The battery cell 20 includes a first wall 201, which is the wall with the largest area in the battery cell 20. The first wall 201 can be understood as the "large surface" of the battery cell 20. The reinforcing member 30 is connected to the at least two battery cells 20 and is thermally connected to the first wall 201 of the at least two battery cells 20.

[0298] As can be seen, each battery cell 20 is connected to the reinforcing member 30. The reinforcing member 30 connects at least two battery cells 20 into a whole. In this case, the side plate and beam structure are no longer needed inside the battery 100, which can maximize the internal space utilization of the battery 100 and improve the energy density of the battery 100. Moreover, the large surface first wall 201 of the battery cell 20 is thermally connected to the reinforcing member 30, so that there is heat exchange between the reinforcing member 30 and the at least two battery cells 20. The heat exchange area between the reinforcing member 30 and the battery cell 20 is large, so as to effectively utilize the reinforcing member 30 to conduct the heat of the at least two battery cells 20, which can ensure that the temperature of the battery cell 20 is in a normal state, improve the service life and safety performance of the battery cell 20. When a battery cell 20 experiences thermal runaway, the heat generated by the thermal runaway battery cell 20 will be carried away by the reinforcing member 30 with which it exchanges heat, reducing the temperature of the thermal runaway battery cell 20 and preventing adjacent battery cells 20 from also experiencing thermal runaway, thereby ensuring the safety performance of the battery cell 20.

[0299] For example, when the temperature of the battery cell 20 is too high, the reinforcing member 30 can cool the battery cell 20 to reduce its temperature. When the temperature of the battery cell 20 is too low, the reinforcing member 30 can heat the battery cell 20 to increase its temperature.

[0300] For example, the battery 100 has multiple battery cells 20, which are arranged along a second direction y. That is, the second direction y is the arrangement direction of multiple battery cells 20 in a row of battery cells 20 in the battery 100. In other words, the battery 100 has at least one row of battery cells 20, with a row of battery cells 20 arranged along the second direction y. The number of battery cells 20 in a row of battery cells 20 can be 2-20, but this embodiment of the application does not limit this. The reinforcing member 30 extends along the second direction y and is connected to each of the multiple battery cells 20. The reinforcing member 30 is thermally connected to the first wall 201 of each of the multiple battery cells 20, so the first wall 201 of the battery cell 20 can face the reinforcing member 30, that is, the first wall 201 of the battery cell 20 can be parallel to the second direction y.

[0301] Optionally, the reinforcing member 30 is fixedly connected to the first wall 201 to realize the connection between the reinforcing member 20 and the battery cell 20, and to facilitate the reliable connection between the battery cell 20 and the reinforcing member 30; of course, the reinforcing member 30 can also be fixedly connected to other walls of the battery cell 20, and is not limited to the first wall 201.

[0302] Optionally, the first wall 201 directly abuts against the reinforcing member 30 to achieve heat transfer between the battery cell 20 and the reinforcing member 30; or the first wall 201 and the reinforcing member 30 indirectly abut against each other, for example, the first wall 201 abuts against the reinforcing member 30 through a thermally conductive component such as thermally conductive adhesive, which can also achieve heat transfer between the battery cell 20 and the reinforcing member 30. Obviously, the thermally conductive connection between the reinforcing member 30 and the first wall 201 means that heat exchange can occur between the first wall 201 and the reinforcing member 30, ensuring the thermal management capability of the reinforcing member 30 for the battery cell 20.

[0303] In some embodiments, such as Figures 4-6 As shown, each battery cell 20 also includes a second wall 202 connected to the first wall 201. The first wall 201 and the second wall 202 are intersecting, so the first wall 201 and the second wall 202 are not parallel, and the first wall 201 and the second wall 202 have a common line. The electrode terminal 214 is disposed on the second wall 202. The electrode terminal 214 is disposed on the wall of the battery cell 20 other than the first wall 201, which intersects with the first wall 201, so as to facilitate the placement of the electrode terminal 214. At the same time, it is convenient to realize the avoidance between the electrode terminal 214 and the reinforcing member 30, so that the reinforcing member 30 does not need to be provided with an avoidance part to avoid the electrode terminal 214, which helps to simplify the structure of the reinforcing member 30.

[0304] For example, in Figure 4 and Figure 5 In the example, the battery cell 20 is generally formed as a cuboid structure, and the length of the battery cell 20 is greater than the width and height of the battery cell 20. A first wall 201 is located on one side of the battery cell 20 in the first direction x, and at least one side of the battery cell 20 in the second direction y has a second wall 202. At least one side of the battery cell 20 in the third direction z also has a second wall 202. Electrode terminals 214 can be disposed on the second wall 202 of the battery cell 20 in the third direction z. Of course, as... Figure 6 As shown, electrode terminals 214 can also be disposed on the second wall 202 of the battery cell 20 in the second direction y.

[0305] Optionally, in Figure 6 In the example, the battery cell 20 can be a blade battery, the length of the battery cell 20 is greater than the width of the battery cell 20 and the height of the battery cell 20, the length of the battery cell 20 in the second direction y is greater than the width of the battery cell 20 in the third direction z and the height of the battery cell 20 in the first direction x, the first wall 201 is located at one end in the height direction of the battery cell 20, and the electrode terminal 214 is located on the second wall 202. Then the electrode terminal 214 can be located at one or both ends in the length direction of the battery cell 20, and / or the electrode terminal 214 is located at one or both ends in the width direction of the battery cell 20.

[0306] Of course, the location of the electrode terminal 214 is not limited to this in this application. Figure 7 and Figure 8 As shown, the electrode terminal 214 can also be disposed on the first wall 201, which also facilitates the arrangement of the electrode terminal 214; for example, the battery cell 20 is a one-stop battery cell. It can be seen that the battery 100 in this embodiment has good flexibility in the placement of the electrode terminals.

[0307] In some embodiments, such as Figure 8 As shown, the motor terminal 214 is disposed on the first wall 201, and at least two battery cells 20 are arranged in the first direction x. In the first direction x, each battery cell 20 is provided with a first surface 203 disposed opposite to the first wall 201. The first surface 203 is provided with a clearance groove 203a. The clearance groove 203a of one of the two adjacent battery cells 20 is used to accommodate the electrode terminal 214 of the other battery cell 20. The first direction x is perpendicular to the first wall 201, so as to realize the compact arrangement of multiple battery cells 20 in the first direction and save space.

[0308] In some embodiments, such as Figures 4-6 As shown, electrode terminals 214 are disposed on the second wall 202. Each battery cell 20 includes two first walls 201 and two second walls 202 disposed opposite to each other. At least two electrode terminals 214 are provided, and the plurality of electrode terminals 214 include a positive electrode terminal 214a and a negative electrode terminal 214b.

[0309] In this configuration, at least two electrode terminals 214 are disposed on the same second wall 202, which helps to save space occupied by the battery cell 20 while ensuring that adjacent electrode terminals 214 have a suitable spacing; or, each second wall 202 is provided with at least one electrode terminal 214, so that the electrode terminals 214 located on different second walls 202 have sufficient spacing.

[0310] For example, in Figure 4 and Figure 5 In the example, the battery cell 20 includes two first walls 201 disposed opposite to each other along a first direction x and two second walls 202 disposed opposite to each other along a third direction z. 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; a plurality of electrode terminals 214 are all located on the same second wall 202 of the battery cell 20 in the third direction z.

[0311] Of course, for a cuboid-shaped battery cell 20, the battery cell 20 may also include two second walls 202 disposed opposite to each other along the second direction y, the second direction y being not parallel to the first direction x, for example, the second direction y being perpendicular to the first direction x; and multiple electrode terminals 214 being located on the same second wall 202 of the battery cell 20 in the second direction y.

[0312] Regardless of whether the multiple electrode terminals 214 are located on one side of the battery cell 20 in the second direction y or on the other 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 sequentially along the second direction y, the second walls 202 of two adjacent battery cells 20 are opposite each other in the second direction y.

[0313] It should be noted that in this application, the first wall 201 can be a plane or a curved surface, and the second wall 202 can be a plane or a curved surface.

[0314] In some embodiments, such as Figure 9 As shown, the first wall 201 is formed into a cylindrical shape; at this time, the battery cell 20 can be roughly a cylindrical battery cell.

[0315] In some embodiments, such as Figure 9 As shown, a second wall 202 is provided at both axial ends of the first wall 201, and at least one second wall 202 is provided with an electrode terminal 214. Thus, all electrode terminals 214 of the battery cell 20 are provided on one of the second walls 202, or at least one electrode terminal 214 of the battery cell 20 is provided on one of the second walls 202, and the remaining electrode terminals 214 of the battery cell 20 are provided on the other second wall 202. This facilitates a flexible arrangement of the electrode terminals 214.

[0316] In some embodiments, such as Figure 9 As shown, one of the second walls 202 is provided with an exposed electrode terminal 214. The electrode assembly 22 includes a positive electrode 221 and a negative electrode 222. One of the positive electrode 221 and the negative electrode 222 is electrically connected to the electrode terminal 214, and the other of the positive electrode 221 and the negative electrode 222 is electrically connected to the first wall 201, so as to realize the normal power supply of the battery cell 20.

[0317] Of course, the other of the positive electrode 221 and negative electrode 222 can also be electrically connected to another second wall 202. That is to say, the second wall 202 with exposed electrode terminals 214 is not the same wall as the second wall 202 that is electrically connected to the other of the positive electrode 221 and negative electrode 222. This also facilitates the normal power supply of the battery cell 20.

[0318] In some embodiments, at least one battery cell 20 is a pouch cell. When the battery 100 includes one battery cell 20, that battery cell 20 is a pouch cell; when the battery 100 includes multiple battery cells 20, at least one of the multiple battery cells 20 is a pouch cell. This facilitates the diversification of the types, structures, and layouts of the battery cells 20 in the battery 100, thereby enabling the battery 100 to meet actual differentiated needs.

[0319] In some embodiments, such as Figure 4 and Figure 5 As shown, the battery cell 20 also includes a pressure relief mechanism 213. The pressure relief mechanism 213 and the electrode terminal 214 are disposed on the same wall of the battery cell 20. For example, the pressure relief mechanism 213 and the electrode terminal 214 are both disposed on the second wall 202.

[0320] Of course, in other embodiments of this application, the battery cell 20 also includes a pressure relief mechanism 213, which and the electrode terminal 214 are respectively disposed on two walls of the battery cell 20.

[0321] Therefore, the position of the pressure relief mechanism 213 relative to the electrode terminal 214 has a certain degree of flexibility.

[0322] In some embodiments, the reinforcing member 30 is bonded to the first wall 201 of at least two battery cells 20 through a first adhesive layer, so that the reinforcing member 30 is bonded to the first wall 201, thereby achieving a reliable and stable connection between the reinforcing member 30 and the battery cells 20, ensuring that the battery 100 as a whole has a certain rigidity and strength, while reducing material consumption and overall weight, which is conducive to achieving a lightweight design of the battery 100, and the structure is simple, making the structure more compact and easy to process and assemble.

[0323] Optionally, the first adhesive layer may include a thermally conductive structural adhesive, which not only provides good adhesion but also possesses thermal conductivity, aging resistance, fatigue resistance, and corrosion resistance. This improves the connection strength and thermal management efficiency between the battery cell 20 and the reinforcing member 30, enabling faster heat transfer between them. Of course, the first adhesive layer may also include double-sided adhesive, etc.

[0324] It should be understood that the reinforcing member 30 and the first wall 201 can also be connected by other means, such as riveting, welding, etc., and this application does not limit this.

[0325] In some embodiments, the bottom of the reinforcing member 30 is bonded to the bottom wall of the receiving cavity 10a through a second adhesive layer, so that the bottom of the reinforcing member 30 is bonded to the bottom wall of the receiving cavity 10a, thereby achieving a fixed connection between the reinforcing member 30 and the bottom wall of the receiving cavity 10a. The structure is simple and easy to process and assemble. At this time, the reinforcing member 30 is bonded and fixed to the first wall 201 and the bottom wall of the receiving cavity 10a respectively, so as to ensure the reliable installation of the reinforcing member 30.

[0326] In some embodiments, the bottom of the battery cell 20 is bonded to the bottom wall of the receiving cavity 10a through a third adhesive layer, so that the bottom of the battery cell 20 is bonded to the bottom wall of the receiving cavity 10a, thereby achieving a fixed connection between the battery cell 20 and the bottom wall of the receiving cavity 10a. The structure is simple and easy to process and assemble. At this time, the reinforcing member 30 is bonded and fixed to the first wall 201, and the battery cell 20 is bonded and fixed to the bottom wall of the receiving cavity 10a. Thus, the reinforcing member 30 is indirectly fixedly connected to the bottom wall of the receiving cavity 10a through the battery cell 20.

[0327] In some embodiments, the bottom of the reinforcing member 30 is bonded to the bottom wall of the receiving cavity 10a by a second adhesive layer, and the bottom of the battery cell 20 is bonded to the bottom wall of the receiving cavity 10a by a third adhesive layer.

[0328] In some embodiments, at least a portion of the heat from the battery cell 20 can be transferred to the reinforcing member 30 through the first adhesive layer. The thickness of the first adhesive layer is less than or equal to the thickness of the second adhesive layer. This is to reduce the thermal resistance between the battery cell 20 and the reinforcing member 30 and to ensure the heat transfer efficiency between the battery cell 20 and the reinforcing member 30, while ensuring a reliable connection between the battery cell 20 and the reinforcing member 30 and a reliable connection between the reinforcing member 30 and the bottom wall of the receiving cavity 10a.

[0329] In some embodiments, the thickness of the first adhesive layer is less than or equal to the thickness of the third adhesive layer, so as to ensure that the battery cell 20 is reliably connected to the reinforcing member 30 and the bottom wall of the receiving cavity 10a, and also to reduce the thermal resistance between the battery cell 20 and the reinforcing member 30, thereby ensuring the heat transfer efficiency between the battery cell 20 and the reinforcing member 30.

[0330] In some embodiments, the thickness of the first adhesive layer is less than or equal to the thickness of the second adhesive layer, and the thickness of the first adhesive layer is less than or equal to the thickness of the third adhesive layer. In this case, the thicknesses of the first adhesive layer, the second adhesive layer, and the third adhesive layer are reasonably set to ensure reasonable distribution and utilization of the adhesive, thereby achieving reliable placement of the battery cell 20 and the reinforcing member 30 within the receiving cavity 10a.

[0331] In some embodiments, the thermal conductivity of the first adhesive layer is greater than or equal to that of the second adhesive layer, and at least a portion of the heat of the battery cell 20 can be transferred to the reinforcing member 30 through the first adhesive layer. This is to reduce the thermal resistance between the battery cell 20 and the reinforcing member 30 and to ensure the heat transfer efficiency between the battery cell 20 and the reinforcing member 30, provided that the connection between the battery cell 20 and the reinforcing member 30 and the bottom wall of the cavity 10a are reliable.

[0332] In some embodiments, the thermal conductivity of the first adhesive layer is greater than or equal to that of the third adhesive layer, so as to ensure that the battery cell 20 is reliably connected to the reinforcing member 30 and the bottom wall of the receiving cavity 10a, and also to reduce the thermal resistance between the battery cell 20 and the reinforcing member 30, and ensure the heat transfer efficiency between the battery cell 20 and the reinforcing member 30.

[0333] Of course, some of the heat from the battery cell 20 can also be dissipated through the third adhesive layer to the bottom wall of the cavity 10a.

[0334] In some embodiments, the thermal conductivity of the first adhesive layer is greater than or equal to that of the second adhesive layer, and the thermal conductivity of the first adhesive layer is greater than or equal to that of the second adhesive layer, so as to achieve reasonable distribution and utilization of the adhesive, ensure the stable setting of the battery cell 20 and the reinforcing member 30, and at the same time ensure the rapid dissipation of heat from the battery cell 20.

[0335] 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.

[0336] Wherein, the first ratio is less than or equal to the second ratio; and / or, the first ratio is less than or equal to the third ratio. Thus, while ensuring the heat exchange effect of the battery cell 20, the colloid is effectively and rationally utilized, facilitating the rational distribution of the colloid.

[0337] In some embodiments, the materials of the first adhesive layer and the second adhesive layer are different; or, the materials of the first adhesive layer and the third adhesive layer are different; or, the materials of the first adhesive layer are different from the materials of the second adhesive layer and the third adhesive layer, respectively.

[0338] In some embodiments, the battery 100 includes a plurality of battery modules 100a, each battery module 100a including at least one row of battery packs 20A and at least one reinforcing member 30. Each battery pack 20A includes a plurality of battery cells 20 arranged in a row along a second direction y. The first wall 201 of each battery cell 20 of the battery pack 20A is fixed to and thermally connected to the reinforcing member 30. There may be multiple battery packs 20A and multiple reinforcing members 30, which are alternately arranged along a first direction x, perpendicular to the first wall 201.

[0339] Optionally, the battery module 100a includes N battery packs 20A and N-1 reinforcing members 30, with the reinforcing members 30 disposed between two adjacent battery packs 20A, where N is an integer greater than 1; taking N=2 as an example, multiple battery modules 100a are arranged along a first direction x, with gaps between adjacent battery modules 100a. Alternatively, the reinforcing members 30 can also be disposed between the battery packs 20A and the inner wall of the housing 10.

[0340] In some embodiments, a row of battery cells 20 arranged along the second direction y may be connected to the reinforcing member 30 on only one side in the first direction x, or both sides in the first direction x may be connected to the reinforcing member 30. This application embodiment does not limit this.

[0341] In some embodiments, the reinforcing member 30 is a heat-conducting member 3a, which exchanges heat with the battery cell 20 to ensure the heat conduction efficiency of the reinforcing member 30 and to ensure that the battery cell 20 has a suitable temperature. Of course, the reinforcing member 30 can also be a thermal management component 3b, which also exchanges heat with the battery cell 20 to ensure that the battery cell 20 has a suitable temperature.

[0342] It is understood that in this application, the heat-conducting component 3a can also be referred to as the thermal management component 3b; of course, the heat-conducting component 3a can also be referred to as the separator 33 with heat conduction and heat exchange function of battery cell 20 as described below.

[0343] In some embodiments, the heat-conducting element 3a includes metallic and / or non-metallic materials, which allows for flexible material selection and enables the heat-conducting element 3a to have other good properties in addition to good thermal conductivity, so as to better meet actual differentiated needs.

[0344] In some embodiments, such as Figures 10-13As shown, the heat-conducting component 3a includes a metal plate 31 and an insulating layer 32, with the insulating layer 32 disposed on the surface of the metal plate 31. This arrangement ensures the strength of the heat-conducting component 3a by the metal plate 31, and the insulating layer 32 ensures that the surface of the heat-conducting component 3a connected to the first wall 201 is an insulating surface, preventing electrical connection between the metal plate 31 and the battery cell 20, thus guaranteeing electrical insulation within the battery 100.

[0345] Optionally, the insulating layer 32 may be an insulating film adhered to the surface of the metal plate 31 or an insulating varnish coated on the surface of the metal plate 31.

[0346] In some embodiments, the heat-conducting element 3a is a non-metallic material plate; that is, the heat-conducting element 3a as a whole is a non-metallic insulating material. Of course, in some embodiments, a portion of the heat-conducting element 3a is a non-metallic material.

[0347] In some embodiments, such as Figure 12 As shown, a cavity 30a is provided inside the heat-conducting component 3a. The cavity 30a can reduce the weight of the heat-conducting component 3a while ensuring its strength, for example, it can be applied when the thickness of the heat-conducting component 3a is large. In addition, the cavity 30a allows the heat-conducting component 3a to have a large compression space in the direction perpendicular to the first wall 201 (e.g., the first direction x), thereby providing a large expansion space for the battery cell 20.

[0348] Optionally, the cavity 30a can be used to contain fluid to regulate the temperature of at least two battery cells 20.

[0349] The fluid serves as a heat exchange medium and can be either a liquid or a gas. Temperature regulation refers to heating or cooling one or more battery cells 20. When cooling the battery cell 20, the cavity 30a can contain a cooling medium to regulate the temperature of one or more battery cells 20. In this case, the fluid can also be called a cooling medium or cooling fluid, more specifically, a coolant or a cooling gas. Alternatively, the fluid can also be used for heating, but this embodiment is not limited to this. Optionally, the fluid can be circulated to achieve better temperature regulation. Optionally, the fluid can be water, a mixture of water and ethylene glycol, heat transfer oil, refrigerant, or air, etc.

[0350] In some embodiments, such as Figure 14 , Figure 15 and Figure 30 As shown, there are multiple battery cells 20, and the multiple battery cells 20 are arranged along the second direction y; the reinforcing member 30 includes a separator 33, which extends along the second direction y and is connected to the first wall 201 of each of the multiple battery cells 20, and the second direction y is parallel to the first wall 201.

[0351] Therefore, by connecting the first wall 201 with the largest surface area of ​​each of the multiple battery cells 20 to the separator 33, and connecting the multiple battery cells 20 into a whole through the separator 33, the battery 100 no longer needs to be equipped with side plates or beams and other structures, which can maximize the space utilization inside the battery 100 and improve the energy density of the battery 100.

[0352] As batteries are used, the blue film on the surface of individual battery cells is prone to damage. When the blue film is damaged, insulation failure can occur between adjacent battery cells and between the battery cell and the casing, increasing the risk of a short circuit. Furthermore, water-cooling plates or heating plates are installed between adjacent battery cells to regulate their temperature. Since these plates lack insulation, water vapor inside the battery can easily liquefy on their surfaces. If the blue film is damaged, the risk of a short circuit is further increased.

[0353] Based on the above considerations, in order to alleviate the problem of battery short circuit caused by damage to the blue film, the inventors, after in-depth research, have designed the reinforcing member 30 to also include an insulating layer 32, which is used to insulate and isolate the first wall 201 and the separator 33 of the battery cell 20.

[0354] The insulating layer 32 is disposed on the surface of the separator 33 and is not easily damaged by the expansion of the battery cell or self-heating. In the case that the surface of the battery cell is not insulated or the blue film on the surface of the battery cell is damaged, when the water vapor inside the battery cell liquefies on the surface of the separator, the insulating layer 32 disposed on the surface of the separator 33 can play an insulating role between the battery cell 20 and the separator 33. This helps to alleviate the problem of short circuit of the battery 100 caused by the damage of the blue film of the battery cell 20 or the liquefaction of water vapor on the surface of the separator 33, reduces the risk of short circuit of the battery 100, and improves the electrical safety of the electrical device.

[0355] The insulating layer 32 is connected to the surface of the partition 33 so that the insulating layer 32 can cover part or all of the surface of the partition 33.

[0356] In some embodiments, the separator 33 is a thermal management component 3b, which is used for heat exchange with the battery cell 20. The thermal management component 3b is a structure that exchanges heat with the battery cell 20, such as a heating resistance wire, a heat-conducting element carrying a heat exchange medium, or a material that can undergo a chemical reaction and change temperature according to changes in the environment. Heat exchange with the battery cell 20 is achieved through the temperature change of the thermal management component 3b itself. In this case, if the temperature of the thermal management component 3b is lower than the temperature of the battery cell 20, the thermal management component 3b can cool the battery cell 20 to prevent thermal runaway due to overheating; if the temperature of the thermal management component 3b is higher than the temperature of the battery cell 20, the thermal management component 3b can heat the battery cell 20 to ensure that the battery 100 can operate normally.

[0357] The thermal management component 3b can also be a structure capable of containing a fluid medium. Heat is transferred between the battery cell 20 and the fluid medium via the thermal management component 3b and the insulating layer 32, thereby achieving heat exchange between the battery cell 20 and the fluid medium. The fluid medium can be a liquid (e.g., water) or a gas (e.g., air). In this case, if the temperature of the fluid medium contained inside the thermal management component 3b is lower than the temperature of the battery cell 20, the thermal management component 3b can cool the battery cell 20 to prevent thermal runaway due to overheating; if the temperature of the fluid medium contained inside the thermal management component 3b is higher than the temperature of the battery cell 20, the thermal management component 3b can heat the battery cell 20 to ensure the battery 100 can operate normally.

[0358] Optionally, the thermal management component 3b can be disposed on one side of the battery cell 20 and located between the battery cell 20 and the housing 10, or it can be disposed between two adjacent battery cells 20.

[0359] In some embodiments, the insulating layer 32 may only insulate the battery cell 20 and the separator 33. In other embodiments, the insulating layer 32 may insulate both the battery cell 20 and the separator 33, or the separator 33 and the inner wall of the housing 10, further reducing the risk of short circuit in the battery 100 and thus further improving the safety of the battery 100.

[0360] For example, multiple battery cells 20 are stacked along the first direction x, and a partition 33 can be provided between two adjacent battery cells 20. An insulating layer 32 is provided on each of the opposite sides of the partition 33, so that each battery cell 20 in two adjacent battery cells 20 is insulated from the partition 33 by the insulating layer 32.

[0361] For example, along the stacking direction of multiple battery cells 20, a partition 33 can also be provided between the two battery cells 20 at the very end and the inner wall of the housing 10. The insulating layer 32 connected to the partition 33 can only insulate and isolate the battery cells 20 and the partition 33. Of course, the insulating layer 32 connected to the partition 33 can insulate and isolate both the battery cells 20 and the partition 33, and also insulate and isolate the partition 33 and the inner wall of the housing 10, further reducing the risk of short circuit of the battery 100 and thus further improving the safety of the battery 100.

[0362] In some embodiments, the thermal conductivity λ of the insulating layer 32 is greater than or equal to 0.1 W / (m·K), so the insulating layer 32 has good thermal conductivity, which enables the insulating layer 32 to transfer heat, so that the battery cell 20 and the separator 33 have good thermal conductivity, thereby improving the heat exchange efficiency between the battery cell 20 and the separator 33; for example, when the separator 33 is a thermal management component 3b, it is easy to effectively ensure that the battery cell 20 has a suitable temperature.

[0363] Thermal conductivity refers to the amount of heat transferred through a 1-meter-thick material with a temperature difference of 1 degree (K, ℃) between its two surfaces in 1 hour under steady-state heat transfer conditions. The unit is watts per meter-degree (W / (m·K), where K can be replaced by ℃).

[0364] In some embodiments, the density G of the insulating layer 32 is ≤ 1.5 g / cm³. 3 .

[0365] The presence of an insulating layer 32 on the surface of the separator 33 increases the weight of the battery 100. The lower the density of the insulating layer 32, the smaller its mass; conversely, the higher the density, the greater its mass. The density G of the insulating layer 32 is ≤ 1.5 g / cm³. 3 This reduces the weight of the insulating layer 32, thereby reducing the weight of the battery 100 and minimizing the impact of the insulating layer 32 on the weight of the battery 100, which is beneficial for the lightweight design of the battery 100.

[0366] In some embodiments, the compressive strength P of the insulating layer 32 satisfies 0.01 MPa ≤ P ≤ 200 MPa, which allows the insulating layer 32 to have a certain degree of elasticity. This allows the insulating layer 32 to reduce the impact on the battery 100 as a whole by deforming itself when the battery cell 20 expands and deforms. Alternatively, the elastic insulating layer 32 can also buffer the battery 100 by deforming itself when it is subjected to impact, thus providing a certain degree of protection for the battery cell 20 and improving the safety of the battery 100.

[0367] Compressive strength refers to the maximum compressive stress that a specimen can withstand during a compression test until it breaks or yields.

[0368] The insulating layer 32 can be made of various materials. For example, in some embodiments, the insulating layer 32 is made of at least one of polyethylene terephthalate, polyimide, and polycarbonate.

[0369] The insulating layer 32 may be made of only one of polyethylene terephthalate, polyimide, and polycarbonate. In other embodiments, the insulating layer 32 may be made of two or three of polyethylene terephthalate, polyimide, and polycarbonate. For example, the insulating layer 32 may include a first insulating portion and a second insulating portion stacked together, wherein 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 still other embodiments, the insulating layer 32 may include a first insulating portion, a second insulating portion, and a third insulating portion stacked together, wherein 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.

[0370] Polyethylene terephthalate (PET), polyimide, and polycarbonate possess advantages such as good impact resistance and good heat aging resistance. Therefore, the insulating layer 32 is made of at least one of PET, polyimide, and polycarbonate, giving it advantages such as good impact resistance and good heat aging resistance. Furthermore, PET typically has a thermal conductivity of 0.24 W / m·K, polyimide typically has a thermal conductivity of 0.1-0.5 W / m·K, and polycarbonate typically has a thermal conductivity of 0.16-0.25 W / m·K. Therefore, all three materials have good thermal conductivity. Using at least one of these three materials to form the insulating layer 32 results in good thermal conductivity, improving the heat exchange performance and efficiency between the battery cell 20 and the separator 33.

[0371] There are many ways to connect the insulating layer 32 to the separator 33. For example, in some embodiments, the insulating layer 32 is a coating applied to the surface of the separator 33. That is, the insulating layer 32 is connected to the separator 33 by coating. In this case, the insulating layer 32 may or may not be connected to the battery cell 20. The insulating layer 32 being a coating applied to the surface of the separator 33 allows the insulating layer 32 to adhere more tightly to the separator 33, thereby improving the connection stability between the insulating layer 32 and the separator 33 and reducing the risk of the insulating layer 32 detaching from the separator 33.

[0372] For example, in some embodiments, the insulating layer 32 and the separator 33 are connected by an adhesive layer. The adhesive layer can be an adhesive layer disposed on the insulating layer 32 and / or the separator 33. After the adhesive layer bonds the separator 33 and the insulating layer 32, the adhesive layer is located between the separator 33 and the insulating layer 32. In this case, the insulating layer 32 can be connected to the battery cell 20 via another adhesive layer, or it can be left unconnected to the battery cell 20. Connecting the insulating layer 32 and the separator 33 via an adhesive layer is a simple and convenient connection method.

[0373] For example, in some embodiments, the insulating layer 32 is potted between the separator 33 and the battery cell 20. Potting is a process in which a liquid composite is mechanically or manually poured into the device and cured at room temperature or under heating conditions to form a high-performance thermosetting polymer insulating material. By potting the insulating layer 32 between the separator 33 and the battery cell 20, the integrity of the overall structure formed by the battery cell 20, the insulating layer 32, and the separator 33 can be strengthened, and the ability to resist external impacts and vibrations can be improved.

[0374] In some embodiments, such as Figure 14 As shown, the dimension T1 of the separator 33 in the first direction x is less than 0.5 mm, and the first direction x is perpendicular to the first wall 201. This can prevent the separator 33 from being too large in the first direction x and occupying too much space inside the battery 100, further improving the space utilization rate inside the battery 100, thereby increasing the energy density of the battery 100.

[0375] In some embodiments, the dimension T1 of the separator 33 in the first direction x is not less than 0.05 mm. This avoids the separator 33 being too small in the first direction x, i.e., the separator 33 is too thin, and the separator 33 is too stiff, which would prevent it from failing to meet the strength requirements of the battery 100.

[0376] In some embodiments, such as Figure 14 As shown in (c), an insulating layer 32 is provided on the surface of the separator 33 to prevent electrical connection between the separator 33 and the battery cell 20, thereby improving the safety of the battery 100. Optionally, the insulating layer 32 can be an insulating film adhered to the surface of the separator 33 or an insulating varnish coated on the surface of the separator 33.

[0377] In some embodiments, the dimension T2 of the insulating layer 32 in the first direction x satisfies: 0.01mm≤T2≤0.3mm.

[0378] When the dimension T2 of the insulating layer 32 in the first direction x is too small, the insulating layer 32 cannot effectively prevent the electrical connection between the battery cell 20 and the separator 33, and the battery 100 will have poor insulation, which poses a safety hazard. When the dimension T2 of the insulating layer 22 in the first direction x is too large, it will occupy too much space inside the battery 100, which is not conducive to improving the energy density of the battery 100. Therefore, the value of T2 is set to 0.01mm to 0.3mm, which can both improve the energy density of the battery 100 and ensure the safety of the battery 100.

[0379] In this embodiment, the voltage E of the battery 100 and the dimension T2 of the insulating layer 32 in the first direction x satisfy: 0.01 × 10⁻⁶. -3 mm / V≤T2 / E≤3×10 -3 mm / V.

[0380] The insulation effect of the insulating layer 32 is related not only to its thickness but also to the thickness of the insulating layer 32 per unit voltage. When T2 / E is too small, i.e., the dimension T2 of the insulating layer 32 per unit voltage in the first x-direction is too small, the insulating layer 32 cannot effectively prevent electrical connection between the battery cell 20 and the separator 33, resulting in poor insulation of the battery 100 and potential safety hazards. When T2 / E is too large, i.e., the dimension T2 of the insulating layer 32 per unit voltage in the first x-direction is too large, it will occupy too much space inside the battery 100, which is not conducive to improving the energy density of the battery 100. Therefore, the value of T2 / E is set to 0.01 × 10⁻⁶. -3 ~3×10 -3 mm / V, which can both improve the energy density of Battery 100 and ensure its safety.

[0381] In some embodiments, the area S1 of the surface of the separator 33 connected to the first wall 201 of the plurality of battery cells 20 and the total area S2 of the first wall 201 of the plurality of battery cells 20 connected to the same side of the separator 33 satisfy: 0.25 ≤ S1 / S2 ≤ 4, where S1 = H1 * L1, S2 = H2 * L2. Figure 15 As shown, H1 is the dimension of the separator 33 in the third direction z, L1 is the dimension of the separator 33 in the second direction y, H2 is the dimension of a single battery cell 20 in the third direction z, and L2 is the sum of the dimensions of multiple battery cells 20 in the second direction y.

[0382] When the value of S1 / S2 is too small, that is, the area S1 of the surface of the separator 33 connected to the first wall 201 of the multiple battery cells 20 is much smaller than the total area S2 of the first wall 201 of the multiple battery cells 20 connected to the same side of the separator 33, the contact area between the first wall 201 and the separator 33 is too small, which cannot meet the strength requirements of the battery 100. When the value of S1 / S2 is too large, that is, the area S1 of the surface of the separator 33 connected to the first wall 201 is much larger than the total area S2 of the first wall 201 of the multiple battery cells 20 connected to the same side of the separator 33, the separator 33 occupies too much space inside the battery 100 compared to the battery cells 20, which is not conducive to improving the energy density of the battery 100. Therefore, the value of S1 / S2 is set to 0.25 to 4, which can improve both the energy density and the strength of the battery 100.

[0383] In some embodiments, such as Figure 15 As shown, in the third direction z, the size H1 of the separator 33 and the size 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.

[0384] When H1 / H2 is too small, that is, in the third direction z, the size H1 of the separator 33 is much smaller than the size H2 of the first wall 201 of the battery cell 20, the contact area between the first wall 201 and the separator 33 is too small, which cannot meet the strength requirements of the battery 100. When H1 / H2 is too large, that is, in the third direction z, the size H1 of the separator 33 is much larger than the size H2 of the first wall 201 of the battery cell 20, the separator 33 occupies too much space inside the battery 100 compared to the battery cell 20, which is not conducive to improving the energy density of the battery 100. Therefore, the value of H1 / H2 is set to 0.2 to 2, which can improve both the energy density and the strength of the battery 100.

[0385] In some embodiments, such as Figure 15 As shown, in the second direction y, the size L1 of the separator 33 and the size L2 of the multiple battery cells 20 satisfy: 0.5≤L1 / L2≤2.

[0386] When L1 / L2 is too small, that is, in the second direction y, the size L1 of the separator 33 is much smaller than the size L2 of the first wall 201 of the battery cell 20, the contact area between the first wall 201 and the separator 33 is too small, which cannot meet the strength requirements of the battery 100. When H1 / H2 is too large, that is, in the second direction y, the size H1 of the separator 33 is much larger than the size L2 of the first wall 201 of the battery cell 20, the separator 33 occupies too much space inside the battery 100 compared to the battery cell 20, which is not conducive to improving the energy density of the battery 100. Therefore, the value of L1 / L2 is set to 0.5 to 2, which can improve both the energy density and the strength of the battery 100.

[0387] Optionally, a fixing structure 103 is provided at the end of the partition 33 in the second direction y, which is connected to the fixing member 104 at the end of the partition 33 in the second direction y to fix the partition 33.

[0388] Adopting attachment Figure 14 The battery cell 20 and separator 33 shown in the table were subjected to vibration and shock resistance tests on the separator under the GB38031-2020 standard "Safety Requirements for Power Batteries for Electric Vehicles". The test results are shown in Table 1. In Table 1, T1 is the dimension of the separator in the first direction x, H1 is the dimension of the separator in the third direction z, L1 is the dimension of the separator 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, S1 = H1 * L1, S2 = H2 * L2.

[0389] Table 1

[0390]

[0391] Adopting attachment Figure 14 and Figure 15 The battery cell 20 and separator 33 shown in the figure were tested for insulation withstand voltage under the following conditions, referring to IEC60664-1: insulation test with 1000VDC applied and insulation resistance ≥500MΩ; withstand voltage test with 2700VDC applied for 60S and leakage current ≤1mA. The test results are shown in Table 2. In Table 2, T2 is the dimension of the insulation layer in the first direction x, and E is the battery voltage.

[0392] Table 2

[0393] T2(mm) E(V) <![CDATA[T2 / E(10 -3 mm / V)]]> Insulation withstand voltage test results 0.01 1000 0.01 Insulation withstand voltage meets requirements 0.3 1000 0.3 Insulation withstand voltage meets requirements 0.3 100 3 Insulation withstand voltage meets requirements 0.15 400 0.38 Insulation withstand voltage meets requirements 0.15 800 0.19 Insulation withstand voltage meets requirements 0.3 300 1 Insulation withstand voltage meets requirements 0.3 200 1.5 Insulation withstand voltage meets requirements 0.2 800 0.25 Insulation withstand voltage meets requirements 0.2 350 0.57 Insulation withstand voltage meets requirements

[0394] In some embodiments, such as Figure 30 and Figure 31 As shown, the dimension T1 of the partition 33 in the first direction x is greater than 5mm, and the first direction is perpendicular to the first wall 201 to ensure that the partition 33 has good reliability in use.

[0395] For example, such as Figure 30 As shown, the battery 10 includes a plurality of battery cells 20 arranged along the second direction Y and a separator 33, the separator 33 extending along the second direction Y and connected to a first wall 201 of each of the plurality of battery cells 20.

[0396] In some embodiments, the dimension T1 of the partition in the first direction x is not greater than 100 mm.

[0397] When the size T1 of the separator in the first direction x is too large, it will occupy too much space inside the battery 100, which is not conducive to improving the energy density of the battery 100. Therefore, setting the value of T1 to no more than 100 mm can effectively improve the energy density of the battery 100.

[0398] In some embodiments, such as Figure 31 As shown, the dimension T1 of the separator 33 in the first direction x and the dimension T3 of the battery cell 20 in the first direction x satisfy: 0.04≤T1 / T3≤2.

[0399] When T1 / T3 is too small, that is, when the dimension T1 of the separator 33 in the first x-direction is much smaller than the dimension T3 of the battery cell 20 in the first x-direction, the separator 33 has a weak ability to absorb deformation and cannot match the expansion deformation of the battery cell 20, which will reduce the performance of the battery cell 20. When T1 / T3 is too large, that is, when the dimension T1 of the separator 33 in the first x-direction is much larger than the dimension T3 of the battery cell 20 in the first x-direction, the separator 33 has an excessive ability to absorb deformation, which far exceeds the expansion deformation space required by the battery cell 20. Compared with the battery cell 20, the separator 33 occupies too much space inside the battery 10, which is not conducive to improving the energy density of the battery 10. Therefore, the value of T1 / T3 is set to 0.04~2, which can both improve the energy density of the battery 10 and absorb the expansion deformation of the battery cell 20.

[0400] In some embodiments, an insulating layer 32 is provided on the outer surface of the partition 33, and the dimension T2 of the insulating layer 32 along the first direction x is 0.01 mm to 0.3 mm.

[0401] By providing an insulating layer 32 on the outer surface of the separator 33, electrical connection between the battery cell 20 and the separator 33 is avoided, thereby improving the safety of the battery 10. When the dimension T2 of the insulating layer 31 in the first direction x is too small, the insulating layer 32 cannot effectively prevent electrical connection between the battery cell 20 and the separator 33, and the battery 100 will experience poor insulation. When the dimension T2 of the insulating layer 32 in the first direction x is too large, it will occupy too much space inside the battery 100, which is not conducive to improving the energy density of the battery 100. Therefore, the value of T2 is set to 0.01mm to 0.3mm, which can both improve the energy density of the battery 100 and ensure effective insulation between the battery cell 20 and the separator 33.

[0402] Optionally, the end of the partition 33 in the second direction y is provided with a current collecting element 106, and a pipe 107 is provided inside the battery 100 for conveying fluid, and the current collecting element 106 for collecting the fluid. For example, the connecting pipe assembly 42 described later may include the pipe 107.

[0403] This application also proposes a method for manufacturing a battery 100, which may include: providing a plurality of battery cells 20 arranged along a second direction y; providing a separator 33 extending along the second direction y and connected to a first wall 201 of each of the plurality of battery cells 20, the first wall 201 being the wall with the largest surface area among the battery cells 20, wherein the dimension T1 of the separator 33 in the first direction x is greater than 5 mm, the first direction x being perpendicular to the first wall 201.

[0404] Adopting attachment Figures 30-34 The battery cell 20 and separator 33 shown in the figure were subjected to 1C / 1C charge-discharge cycles at 60°C until the capacity decayed to 80% SOC. The results of the accelerated cycle durability test are shown in Table 3. In Table 3, T1 is the dimension of the separator in the first direction x, and T3 is the dimension of the battery cell in the first direction x.

[0405] Table 3

[0406] T3 (mm) T1(mm) T1 / T3 Results of Cyclic Endurance Accelerated Test 125 5.1 0.041 The structure was undamaged and there was no water drop. 26.5 6 0.226 The structure was undamaged and there was no water drop. 12.5 25 2.000 The structure was undamaged and there was no water drop. 47.4 5.1 0.108 The structure was undamaged and there was no water drop. 44 20 0.455 The structure was undamaged and there was no water drop. 44 60 1.364 The structure was undamaged and there was no water drop. 70.7 70 0.990 The structure was undamaged and there was no water drop. 10 15 1.500 The structure was undamaged and there was no water drop. 44 30 0.682 The structure was undamaged and there was no water drop. 10.72 6 0.085 The structure was undamaged and there was no water drop. 10 6 0.6 The structure was undamaged and there was no water drop.

[0407] In some embodiments, such as Figures 10-13 As shown, since the reinforcing member 30 is fixedly connected to the first wall 201 of one or more battery cells 20 respectively, in order to ensure the performance of the battery 100, the reinforcing member 30 must also meet the strength requirements. The size of the reinforcing member 30 in the first direction x is set to 0.1mm to 100mm, and the first direction is perpendicular to the first wall 201, so as to simultaneously meet the strength and space requirements.

[0408] Specifically, the dimension T4 of the reinforcing member 30 in the first direction, i.e., the thickness of the reinforcing member 30, is crucial. A larger T4 results in higher strength for the reinforcing member 30, while a smaller T4 occupies less space. When T4 < 0.1 mm, the reinforcing member 30 is easily damaged under external forces; when T4 > 100 mm, it occupies too much space, affecting energy density. Therefore, when the dimension T4 of the reinforcing member 30 in the first direction x is between 0.1 mm and 100 mm, space utilization can be improved while ensuring strength.

[0409] In some embodiments of this application, a reinforcing member 30 is provided in the battery 100 and connected to a first wall 201 with the largest surface area for each of a plurality of battery cells 20 arranged in a row along a second direction y. The reinforcing member 30 is used to conduct heat from the battery cells 20, and the surface of the reinforcing member 30 connected to the first wall 201 is an insulating surface. The dimension of the reinforcing member 30 in the first direction x perpendicular to the first wall 201 is 0.1 mm to 100 mm. In this way, beams or other structures are no longer needed in the middle of the battery casing 10, maximizing the utilization of internal space and thus increasing the energy density of the battery 100. Simultaneously, the reinforcing member 30 also ensures electrical insulation and thermal conductivity within the battery 100. Therefore, the technical solution of this application can improve the energy density of the battery 100 while ensuring electrical insulation and thermal conductivity, thereby improving the performance of the battery 100.

[0410] In some embodiments, the dimension T3 of the battery cell 20 in the first direction x and the dimension T5 of the heat conductor 3a in the first direction x satisfy: 0 < T5 / T3 ≤ 7.

[0411] When T5 / T3 is too large, the heat-conducting component 3a occupies a large space, affecting the energy density. Furthermore, excessively rapid heat conduction by the heat-conducting component to the battery cell 20 may also cause safety issues. For example, thermal runaway of one battery cell 20 may trigger thermal runaway of other battery cells 20 connected to the same heat-conducting component. When 0 < T5 / T3 ≤ 7, the energy density and safety performance of the battery 100 can be guaranteed.

[0412] In some embodiments, the dimensions T3 of the battery cell 20 in the first direction x and the dimensions T5 of the heat-conducting element 3a in the first direction x can further satisfy 0 < T5 / T3 ≤ 1, so as to further improve the energy density of the battery 100 and ensure the safety performance of the battery 100.

[0413] In some alternative embodiments, the weight M1 of the battery cell 20 and the weight M2 of the heat-conducting component 3a satisfy: 0 < M2 / M1 ≤ 20.

[0414] When M2 / M1 is too large, the gravimetric energy density will be lost. When 0 < M2 / M1 ≤ 20, the gravimetric energy density of battery 100 can be guaranteed and the safety performance of battery 100 can be guaranteed.

[0415] Optionally, in one embodiment of this application, the weight M1 of the battery cell 20 and the weight M2 of the heat-conducting component 3a may further satisfy 0.1≤M2 / M1≤1, so as to further improve the energy density of the battery 100 and ensure the safety performance of the battery 100.

[0416] In some embodiments, the area S3 of the first wall 201 and the area S4 of the surface of the heat-conducting member 3a connected to the first wall 201 of a row of multiple battery cells 20 satisfy 0.2≤S4 / S3≤30.

[0417] S4 represents the total surface area of ​​the side where the heat-conducting component 3a connects to the battery cell 20. When S4 / S3 is too large, it affects the energy density. When S4 / S3 is too small, the thermal conductivity is too poor, affecting safety performance. A ratio of 0.2 ≤ S4 / S3 ≤ 30 ensures both the energy density and safety performance of the battery 10.

[0418] Optionally, S4 and S3 can further satisfy 2≤S4 / S3≤10 to further improve the energy density of battery 100 and ensure the safety performance of battery 100.

[0419] In some embodiments, the specific heat capacity C of the heat-conducting element 3a and the weight M2 of the heat-conducting element 3a satisfy the following: 0.02KJ / (kg2*℃)≤C / M2≤100KJ / (kg2*℃).

[0420] When C / M2 < 0.02 KJ / (kg2*℃), the heat-conducting component 3a will absorb a large amount of energy, causing the temperature of the battery cell 20 to be too low, which may lead to lithium plating. When C / M2 > 100 KJ / (kg2*℃), the heat-conducting component 3a has poor thermal conductivity and cannot remove heat in time. When 0.02 KJ / (kg2*℃) ≤ C / M2 ≤ 100 KJ / (kg2*℃), the safety performance of battery 100 can be guaranteed.

[0421] Alternatively, C and M2 can further satisfy the following relationship:

[0422] 0.3KJ / (kg2*℃)≤C / M2≤20KJ / (kg2*℃) to further improve the safety performance of Battery 100.

[0423] In some embodiments, the battery 100 may include a plurality of battery modules 100a. Each battery module 100a may include at least one row of multiple battery cells 20 arranged along a second direction y and at least one heat-conducting element 3a, with the at least one row of battery cells 20 and the at least one heat-conducting element 3a alternately arranged in a first direction x. That is, for each battery module 100a, the rows of battery cells and the heat-conducting element 3a are alternately arranged in the first direction x, and the plurality of battery modules 100 are housed within the housing 10 to form the battery 100.

[0424] Optionally, the battery module 100a includes two rows of battery cells 20, and a heat-conducting element 3a is disposed in each of the two rows of battery cells 20. No heat-conducting elements 3a are disposed between adjacent battery modules 100a. Thus, this embodiment allows for fewer heat-conducting elements 3a to be disposed within the battery 100, while ensuring that each battery cell 20 can be connected to a heat-conducting element 3a.

[0425] Optionally, multiple battery modules 100 are arranged along the first direction x, with gaps between adjacent battery modules 100 and no heat-conducting component 3a between adjacent battery modules 100. In this case, the gaps between adjacent battery modules 100a can provide expansion space for the battery cells 20.

[0426] Optionally, a fixing structure 103 is provided at the end of the heat-conducting component 3a in the first direction x, and the heat-conducting component 3a is fixed to the housing 10 by the fixing structure 103. Figure 19 As shown, the fixing structure 103 may include a fixing member 104, which is fixedly connected to the end of the heat-conducting member 3a and connected to the battery cell 20 located at the end of the heat-conducting member 3a, thereby enhancing the fixing effect on the battery cell 20.

[0427] Optionally, the heat-conducting component 3a is bonded to the first wall 201. That is, the heat-conducting component 3a and the battery cell 20 can be fixedly connected by bonding, for example, by structural adhesive, but this embodiment of the application is not limited to this.

[0428] Optionally, the battery cells 20 can be bonded to the housing 11. Optionally, adjacent battery cells 20 in each row can also be bonded together, for example, the second walls 2112 of two adjacent battery cells 20 can be bonded together with structural adhesive, but this embodiment is not limited to this. Bonding adjacent battery cells 20 in each row can further enhance the fixing effect of the battery cells 20.

[0429] Adopting attachment Figure 10-13The battery cell 20 and heat-conducting component 3a are shown in the figure. The number of battery cells 20 in one row is 2-20. The battery 10 is subjected to safety test according to GB38031-2020. The test results are shown in Tables 4-7. It can be seen that the battery 100 of the present application embodiment can meet the safety performance requirements.

[0430] Table 4

[0431] serial number T5 / mm T3 / mm T5 / T3 Test Results 1 0.2 40 0.005 No fire, no explosion 2 0.4 50 0.008 No fire, no explosion 3 0.7 45 0.016 No fire, no explosion 4 4 10 0.4 No fire, no explosion 5 4 40 0.1 No fire, no explosion 6 45 15 3 No fire, no explosion 7 150 10 15 Fire, explosion

[0432] Table 5

[0433] serial number M2 / Kg M1 / Kg M2 / M1 Test Results 1 0.2 3 0.068 No fire, no explosion 2 0.4 2.5 0.16 No fire, no explosion 3 0.7 1.5 0.467 No fire, no explosion 4 10 1.5 6.7 No fire, no explosion 5 15 1 15 No fire, no explosion

[0434] Table 6

[0435]

[0436]

[0437] Table 7

[0438] serial number C / KJ / (Kg*℃) M2 / kg C / M2(KJ / (kg2*℃)) Test Results 1 0.39 25 0.016 Fire, explosion 2 0.46 5 0.092 No fire, no explosion 3 0.88 0.5 1.76 No fire, no explosion 4 4 0.4 10 No fire, no explosion 5 4 0.1 40 No fire, no explosion 6 4 0.025 160 Fire, explosion

[0439] In some embodiments, such as Figure 15 and Figure 35 As shown, in the third direction z, the dimension H1 of the separator 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. In this way, the space utilization rate inside the battery 100 can be further maximized, thereby increasing the energy density of the battery 100.

[0440] On the third direction z, the dimension H1 of the partition can be the height of the partition, and the dimension H2 of the first wall 201 can be the height of the first wall 201. The relationship between H1 and H2 satisfies: 0.1≤H1 / H2≤2.

[0441] When H1 / H2 < 0.1, the heat exchange area between the battery cell 20 and the separator is small, making it impossible to cool or heat the battery cell 20 in time, which makes it difficult to meet the thermal management requirements of the battery.

[0442] When H1 / H2>2, although the thermal management requirements of battery 100 can be met, the separator 33 occupies a lot of space and wastes the space utilization rate in the third direction z, making it difficult to guarantee the energy density requirements of battery 100.

[0443] Optionally, H1 / H2 can be 0.1, 0.4, 0.6, 0.9, 1.2, 1.5, 1.8, or 2, etc.

[0444] In some examples, the separator 33 is a thermal management component 3b, which is used to regulate the temperature of the battery cell 20. The height of the thermal management component 3b in the third direction z is H1.

[0445] Optionally, the thermal management component 3b can be a water-cooled plate for cooling the battery cell 20 during fast charging or heating the battery cell 20 when the temperature is too low.

[0446] Optionally, the thermal management component 3b can be made of a material with good thermal conductivity, such as aluminum or other metals.

[0447] In some embodiments, the dimensions H1 of the separator 33 and H2 of the first wall 201 also satisfy: 0.3 ≤ H1 / H2 ≤ 1.3. This ensures that the temperature of the battery cell 20 does not exceed 55°C during fast charging.

[0448] Optionally, H1 / H2 can be 0.3, 0.5, 0.8, 1.0, 1.1, or 1.3, etc.

[0449] Optionally, in one embodiment of this application, the heat exchange area between the first wall 201 and the separator is S, and the relationship between the capacity Q of the battery cell 20 and the heat exchange area S satisfies: 0.03 Ah / cm² 2 ≤Q / S≤6.66Ah / cm 2 .

[0450] The heat exchange area S can be the contact area between the first wall 201 and the partition 33. The heat exchange area S satisfies: S = H1 * L, where L is the dimension of each battery cell 20 along the first direction.

[0451] When Q / S < 0.03 Ah / cm 2 At this time, the heat exchange area S is large enough to meet the thermal management requirements of the battery, but the space occupied by the thermal management component 3b is too large, making it difficult to meet the energy density requirements of the battery 100.

[0452] When Q / S > 6.66 Ah / cm 2 When the heat exchange area S is small, the heat of the battery cell 20 cannot be dissipated through the separator 33 in time, and the battery cell 20 cannot be cooled quickly and in a timely manner, which makes it difficult to meet the requirements of thermal management.

[0453] By adjusting the relationship between the heat exchange area S and the capacity Q of the battery cell 20, the temperature of the battery cell 20 can be maintained within a suitable range during the charging process, especially during fast charging. In addition, when the capacity Q of the battery cell is constant, the thermal management requirements of the battery can be flexibly met by adjusting the heat exchange area S.

[0454] In one possible implementation, the size H1 of the separator 33 is 1.5cm to 30cm. This ensures that the temperature of the battery cell 20 does not exceed 55°C during fast charging.

[0455] The battery was charged, and the test results are shown in Table 8.

[0456] Table 8 Temperature test results during charging of battery cells and thermal management components of different specifications.

[0457]

[0458] In some embodiments, such as Figure 12 and Figure 32 As shown, a cavity 30a is provided inside the partition 33.

[0459] Thus, the separator 33 with the cavity structure has the ability to absorb deformation, which can absorb the expansion deformation of the battery cell 20 and improve the performance of the battery 100; in other words, the cavity 30a can make the separator 33 have a larger compression space in the first direction x, thereby providing a larger expansion space for the battery cell 20.

[0460] In addition, the cavity 30a can reduce the weight of the partition 33 while ensuring its strength, for example, it can be applied to cases where the partition 33 is thick.

[0461] Optionally, the cavity 30a can be used to contain the heat exchange medium to regulate the temperature of the battery cell 20. This allows for convenient adjustment of the temperature of the battery cell 20 within a suitable range at any time, improving the stability and safety of the battery cell 20. Therefore, the cavity 30a can also be referred to as a heat exchange chamber, and the cavity 30a corresponds to one or more flow channels 30c used to contain the heat exchange medium.

[0462] It should be understood that the fluid referred to herein can be a liquid that can regulate temperature and does not chemically react with the cavity 30a material, such as water, and this application does not limit it.

[0463] In some embodiments, such as Figure 12 and Figure 32 As shown, in the first direction x, the size of the cavity 30a is W. The capacity Q of the battery cell 20 and the size W of the cavity 30a satisfy: 1.0 Ah / mm ≤ Q / W ≤ 400 Ah / mm. The first direction x is perpendicular to the first wall 201, so as to effectively utilize the separator 33 to prevent heat diffusion between the battery cells 20. By rapidly cooling down the battery cell 20 with an excessively high temperature, the heat of the battery cell 20 can be prevented from diffusing and transferring to adjacent battery cells 20, thereby preventing the adjacent battery cells 20 from becoming too hot.

[0464] When Q / W > 400 Ah / mm, the size W of the cavity 30a is relatively small, and the volume of fluid that can be contained or flow through the cavity 30a is also small, making it impossible to cool the battery cells 20 in time. Therefore, when the temperature of a battery cell 20 becomes too high, due to the lack of timely cooling, the heat from that battery cell 20 diffuses to adjacent battery cells 20, causing the adjacent battery cells 20 to also become overheated and malfunction, affecting the performance of the entire battery 10.

[0465] When Q / W < 1.0 Ah / mm, the size W of cavity 30a is relatively large, and the volume of fluid that can be contained or flow through cavity 104 is relatively large, which can fully cool the battery cell 20. However, the large size of cavity 30a results in a large space occupied by separator 33, which cannot guarantee the energy density of battery 100. At the same time, the excessively large size of separator 33 also leads to an increase in cost.

[0466] The cavity 30a can be formed by a pair of heat-conducting plates 333 in the separator 33. The size W of the cavity 30a along the first direction x can be the distance between the inner walls of the two heat-conducting plates 333 along the first direction x. The larger the size W of the cavity 30a, the larger the volume of the cavity 30a, and the larger the volume of fluid that can be contained or flow through the cavity 30a. Therefore, the heat transfer between the battery cell 20 and the separator 33 is faster. For example, when the separator 33 is a water-cooled plate, the larger the size W of the cavity 30a, the faster the heat of the battery cell 20 dissipates, and the faster the cooling of the battery cell 20 is achieved, which can prevent the heat of the battery cell 20 from diffusing to adjacent battery cells 20. Optionally, the fluid can be circulated to achieve a better temperature regulation effect. Optionally, the fluid can be water, a mixture of water and ethanol, a refrigerant, or air, etc.

[0467] Figure 36 This is a schematic diagram of the connection between a battery cell and a thermal management component according to an embodiment of this application. Figure 37 for Figure 36 Cross-sectional view along the AA direction. Figure 38 for Figure 37 An enlarged schematic diagram of region G in this application. In one embodiment of this application, combined with... Figures 36 to 38 The dimension T3 of the battery cell 20 along the first direction x and the dimension H of the thermal management component 3b along the third direction satisfy: 0.03≤T3 / H≤5.5, and the third direction is perpendicular to the first direction and the second direction.

[0468] The dimension T3 of the battery cell 20 along the first direction x can be the thickness T3 of the battery cell 20. The thickness T3 of the battery cell 20 is related to the capacity Q of the battery cell 20. The larger the thickness T3, the larger the capacity Q.

[0469] The dimension H1 of the separator 33 along the third direction can be the height H of the thermal management component 3b along the third direction. The larger H is, the larger the volume of the thermal management component 3b, the larger the space it occupies, and the stronger its thermal management capability. For example, when the thermal management component 3b is a water-cooled plate, the larger H is, the stronger its cooling capability for the battery cell 20, and the more effectively it can prevent the heat of the battery cell 20 from diffusing to adjacent battery cells 20.

[0470] When T3 / H < 0.03, the size H of the thermal management component 3b along the third direction is relatively large, which can fully meet the requirements of preventing heat diffusion of the battery cell 20, but it is difficult to meet the energy density requirements of the battery 10. At the same time, the larger volume of the thermal management component 3b will also lead to a reduction in production costs.

[0471] When T3 / H > 5.5, the thermal management component 3b is unable to meet the thermal management requirements of the battery cell 20, that is, it cannot dissipate the heat of the battery cell 20 in time, which causes the heat to spread to the adjacent battery cells 20, causing abnormal temperature of other battery cells 20, and thus affecting the performance of the battery 10.

[0472] In some embodiments, the dimension H1 of the partition 33 along the third direction is 15mm to 300mm. In this way, the partition 33 can meet the requirements of both strength and thermal management performance.

[0473] In some embodiments, the size W of the cavity 30a is 0.8 mm to 50 mm. This allows for a balance between strength and thermal management performance.

[0474] The following uses a combination of two rows of battery cells 20 and two separators 33 to conduct a thermal diffusion test on battery 100 according to GB38031-2020. The test results are shown in Table 9.

[0475] Table 9 Thermal diffusion test of battery cells and separators of different specifications

[0476] (Q / Ah) (T3 / mm) (H / mm) (W / mm) Q / W T3 / H Does it spread heat? 280 88 260 50 5.6 0.3385 no 280 88 260 6 46.6667 0.3385 no 280 88 102 6 46.6667 0.8627 no 280 88 102 3 93.3333 0.8627 no 280 88 102 0.8 350 0.8627 no 280 88 30 6 46.6667 2.9333 no 280 88 13 0.6 466.6667 6.7692 yes 248 66.5 80 2 124 0.8313 no 248 66.5 102 0.8 310 0.652 no 169 70 102 3 56.6666 0.6863 no 70 28.5 102 2 35 0.2794 no 180 79 80 2 90 0.9875 no 117 33.2 102 0.8 146.25 0.3255 no 5 12.5 50 3 1.6667 0.25 no 5 12.5 150 3 1.6667 0.0833 no 5 12.5 102 0.8 6.25 0.1225 no

[0477] In some embodiments, such as Figure 32 , Figure 33 and Figure 38 As shown, the partition 33 also includes a pair of heat-conducting plates 333 arranged opposite each other along a first direction, and the cavity 30a is disposed between the pair of heat-conducting plates 333, with the first direction perpendicular to the first wall 201.

[0478] For example, each heat-conducting plate 333 extends along a second direction, and the two heat-conducting plates 333 are opposite each other along a first direction to form a cavity 30a between the two heat-conducting plates 333. The cavity 30a can serve as a flow channel for the heat exchange medium, so that the partition 33 is formed as a heat-conducting element 3a or a thermal management component 3b.

[0479] In some embodiments, such as Figure 32 As shown, the dimension D of the heat-conducting plate 333 in the first direction x is 0.1mm to 5mm.

[0480] When the dimension D of the heat-conducting plate 333 in the first direction is too small, and the space inside the separator 33 is fixed, the cavity 30a occupies most of the space of the separator 33. In this case, the rigidity of the separator 33 is very poor and cannot effectively improve the structural strength of the battery 10. When the dimension D of the heat-conducting plate 333 in the first direction is too large, the cavity 30a inside the separator 33 is very small and can hold very little fluid, so it cannot effectively regulate the temperature of the battery cell 20. Therefore, the value of D is set to 0.1mm to 5mm.

[0481] Optionally, the dimensions D of the pair of heat-conducting plates 333 of the partition 333 in the first direction may be the same or different.

[0482] Optionally, the two heat-conducting plates 333 can be made of a material with good thermal conductivity, such as aluminum or other metals.

[0483] In some embodiments, such as Figure 33 and Figure 38 As shown, the partition 33 also includes a reinforcing rib 334, which is disposed between a pair of heat-conducting plates 33 to enhance the structural strength of the partition 33.

[0484] Optionally, the number of reinforcing ribs 334 is one, so that one or more cavities 30a can be formed between a pair of heat-conducting plates 333.

[0485] Optionally, when there are multiple cavities 30a, the different cavities 30a can be independent of each other or connected by an adapter.

[0486] When the reinforcing rib 334 is connected to only one of the pair of heat-conducting plates 333, the reinforcing rib 334 is a cantilever with one end connected to the heat-conducting plate 333. In this case, the cavity 30a can correspond to one flow channel 30c. When the reinforcing rib 334 is connected to each of the pair of heat-conducting plates 333, the cavity 30a can correspond to multiple flow channels 30c. The number of reinforcing ribs 334 can be specifically set according to requirements, and this application embodiment does not limit this.

[0487] In some embodiments, such as Figure 33 and Figure 45 As shown, the reinforcing rib 334 is connected to at least one of a pair of heat-conducting plates 333 to further ensure the structural strength of the partition 333.

[0488] Optionally, such as Figure 33As shown, the reinforcing rib 334 can be set on only one heat-conducting plate 333, or the reinforcing rib 334 can be set between a pair of heat-conducting plates 333 and connected to the pair of heat-conducting plates 333.

[0489] Optionally, such as Figure 33 As shown, when the reinforcing rib 334 is connected to a pair of heat-conducting plates 333, the included angle between the reinforcing rib 334 and the heat-conducting plates 333 can be an acute angle to provide more expansion space for the battery cell 20; Figure 33 As shown, when the reinforcing rib 334 is connected to a heat-conducting plate 333, the angle between the reinforcing rib 334 and the heat-conducting plate 333 can also be a right angle, so that the partition can withstand greater pressure.

[0490] Optionally, the reinforcing rib 334 can be irregular in shape, such as C-shaped, wavy, or cross-shaped, which can effectively absorb expansion and increase turbulence to enhance heat exchange.

[0491] In some embodiments, such as Figure 45 As shown, the reinforcing rib 334 includes a first reinforcing rib 3341, the two ends of which are respectively connected to a pair of heat-conducting plates 333. The first reinforcing rib 3341 is used to support the pair of heat-conducting plates 333. When the separator 333 deforms to absorb the expansion force of the battery cell 20, the first reinforcing rib 3341 can deform to accommodate the pair of heat-conducting plates 33, at least partially, moving towards each other along the first direction x.

[0492] The first reinforcing rib 3341 is inclined relative to the first direction x, so the angle between the first reinforcing rib 3341 and one of the pair of heat-conducting plates 333 is less than 90°. This can improve the flexibility of the first reinforcing rib 3341, and it can better deform to meet the needs of the partition 33 to absorb the expansion force. This avoids the risk of small deformation space and easy breakage and failure caused by a flat shape.

[0493] Optionally, there may be one or more first reinforcing ribs 3341, and multiple first reinforcing ribs 3341 may be spaced apart along the third direction z; wherein the spacing between two adjacent first reinforcing ribs 3341 may be the same or different.

[0494] Optionally, the material of the first reinforcing rib 3341 can be made of a reinforcing rib structure, which can achieve a lightweight design of the separator 333 while ensuring the supporting function, thereby achieving a lightweight design of the battery 100 as a whole.

[0495] Optionally, the first reinforcing rib 3341 is connected to a pair of heat-conducting plates 333, and the first reinforcing rib 3341 extends along the second direction y to increase the connection area between the first reinforcing rib 3341 and each heat-conducting plate 333 and improve the support strength.

[0496] Optionally, the first reinforcing rib 3341 is a plate-shaped structure, so that it can deform better to meet the requirements of the separator to absorb the expansion force of the battery cell 20; and it is also conducive to production and processing and improves manufacturing efficiency.

[0497] In some embodiments, such as Figure 45 As shown, the angle between the first reinforcing rib 3341 and the first direction x is in the range of 30°-60°. Therefore, the angle between the first reinforcing rib 3341 and one of the pair of heat-conducting plates 333 is in the range of 30°-60°, which is beneficial to better meet the support requirements while deforming and is not easy to break.

[0498] Optionally, when there are multiple first reinforcing ribs 3341, the inclination directions of two adjacent first reinforcing ribs 3341 can be the same or different.

[0499] In some embodiments, such as Figure 45 As shown, the reinforcing rib 334 also includes a second reinforcing rib 3342. One end of the second reinforcing rib 3341 is connected to one of the pair of heat-conducting plates 333, and the other end of the second reinforcing rib 3342 is spaced apart from the other of the pair of heat-conducting plates 333. For example, the extension dimension of the second reinforcing rib 3342 in the first direction x is smaller than the distance between the pair of heat-conducting plates 333.

[0500] Therefore, by setting the second reinforcing rib 3342, it can work together with the first reinforcing rib 3341 to achieve a better support effect, and can also control the deformation range of the partition 33. When the second reinforcing rib 3342 of one of the pair of heat-conducting plates 333 comes into contact with the other, it can further limit the deformation of the partition 33, avoid blockage of the flow channel 30c corresponding to the cavity 30a, ensure the effectiveness of the flow channel 30c, and thus ensure the effectiveness of the partition 33.

[0501] Optionally, the pair of heat-conducting plates 333 are respectively a first heat-conducting plate 3331 and a second heat-conducting plate 3332. The second reinforcing rib 3342 can be provided on the first heat-conducting plate 3331 or on the second heat-conducting plate 3332. For example, both the first heat-conducting plate 3331 and the second heat-conducting plate 3332 are provided with the second reinforcing rib 3342.

[0502] In some embodiments, such as Figure 45 As shown, in the third direction z, a second reinforcing rib 3342 is provided between each of two adjacent first reinforcing ribs 3341. Optionally, one of the two adjacent second reinforcing ribs 3342 is provided in the first heat-conducting plate 3331 and the other is provided in the second heat-conducting plate 3332, so as to ensure that the first heat-conducting plate 3331 and the second heat-conducting plate 3332 are subjected to uniform force and do not bear too much weight.

[0503] In some embodiments, such as Figure 45As shown, the second reinforcing rib 3342 extends along the first direction x and protrudes from one of the pair of heat-conducting plates 333, simplifying the structure of the second reinforcing rib 3342 and facilitating processing.

[0504] Optionally, the second reinforcing rib 3342 is a polygonal prism to give it a sufficient cross-sectional area. When the separator 33 absorbs the expansion force of the battery cell 20 and deforms to the point that the second reinforcing rib 3342 on one of the pair of heat-conducting plates 333 comes into contact with the other, the second reinforcing rib 3342 has a sufficient contact area to better improve the support capacity and prevent the second reinforcing rib 3342 from being damaged or even failing, which would cause the two heat-conducting plates 333 to come into contact, thereby ensuring the effectiveness of the separator 33.

[0505] In some embodiments, such as Figure 45 As shown, the first reinforcing rib 3341 and the second reinforcing rib 3342 are spaced apart to ensure that the two heat-conducting plates 333 are subjected to relatively uniform force.

[0506] In some embodiments, along a third direction z (e.g., the height direction of the housing 10), the first reinforcing rib 3341 and the second reinforcing rib 3342 are alternately distributed. For example, two adjacent first reinforcing ribs 3341 and second reinforcing ribs 3342 can be alternately arranged on the first heat-conducting plate 3331 and the second heat-conducting plate 3332. Of course, the position of the second reinforcing rib 3342 can also be arranged according to a certain arrangement rule.

[0507] For example, on the third direction z, one of the two adjacent second reinforcing ribs 3342 is disposed on the first heat-conducting plate 3331 and the other is disposed on the second heat-conducting plate 3332, so as to ensure that the first heat-conducting plate 3331 and the second heat-conducting plate 3332 are subjected to uniform force and do not bear too much weight.

[0508] This configuration ensures both uniformity of support for the two heat-conducting plates 333 and prevents blockage in each part of the flow channel 30c corresponding to the cavity 30a along the second direction y, thus guaranteeing the effectiveness of the flow channel 30c.

[0509] In some embodiments, such as Figure 32 and Figure 45 As shown, in the first direction x, the thickness D of the heat-conducting plate 333 and the size W of the cavity satisfy: 0.01≤D / W≤25, so as to simultaneously take into account the requirements of strength and thermal management performance.

[0510] Specifically, when the size W of the cavity 30a is large, the flow resistance of the fluid in the cavity 30a is low, which can increase the heat exchange of the separator 33 per unit time; when the thickness D of the heat-conducting plate 333 is large, the strength of the separator 33 is high. When D / W is less than 0.01, the size W of the cavity 30a is large enough, but it occupies too much space; or within the given space of the separator 33, the thickness D of the heat-conducting plate 333 may be too thin, resulting in insufficient strength. For example, it may not meet the vibration and impact requirements of the battery 20, or even cause the separator 33 to be crushed during initial assembly. When D / W ≥ 25, the thickness D of the heat-conducting plate 333 is sufficiently thick. However, within the given space of the separator 33, the size W of the cavity 30a may be too small, increasing the flow resistance of the fluid in the cavity 30a, resulting in poor heat exchange performance or blockage of the cavity 30a during use. Simultaneously, due to the excessive wall thickness of the heat-conducting plate 333, the force generated by the expansion of the battery cell 20 cannot meet the crushing force on the separator 33 corresponding to the expansion space required by the battery cell 20. In other words, the separator 33 cannot promptly provide the expansion space required by the battery cell 20, accelerating the capacity reduction of the battery cell 20. Therefore, when the thickness D of the heat-conducting plate 333 and the size W of the cavity 30a satisfy 0.01 ≤ D / W ≤ 25, both strength and thermal management performance requirements can be simultaneously considered, ensuring the performance of the battery 100.

[0511] Optionally, when 0.01≤D / W≤0.1, the fluid can be a solid-liquid phase change material or a liquid working fluid, the outer layer of the partition 33 can be a membrane material as a skin, and the interior can be filled with a skeleton structure for reinforcement. This scheme can be used for situations where the strength requirement is low or the compressibility requirement of the partition 33 is high.

[0512] Optionally, when the value is within the range of 0.1≤D / W≤1, the partition 33 can be equipped with a fluid working medium convection heat transfer or vapor-liquid phase change cooling scheme, using a liquid working medium as the heat transfer medium to ensure the heat transfer performance of the partition 33.

[0513] Optionally, when 1≤D / W≤25, the partition 33 can adopt a vapor-liquid phase change cooling scheme. By adjusting the internal gap, the overall pressure is increased to ensure that the working fluid exists in liquid form inside the partition 33, preventing the coexistence of vapor and liquid states due to pressure loss and providing heat exchange performance. At the same time, the thickness D of the heat-conducting plate 333 is thick enough to prevent the partition 33 from cracking due to the increase in internal working fluid vaporization pressure during heating.

[0514] Optionally, the thickness D of the heat-conducting plate 333 and the size W of the cavity 30a further satisfy 0.05≤D / W≤15, and even further satisfy 0.1≤D / W≤1, so as to better balance space, strength and thermal management, and further improve the performance of the battery 100.

[0515] Optionally, the dimension T1 of the partition 33 in the first direction x is 0.3mm to 100mm.

[0516] T1 is the total thickness of the thermal management component separator 33, i.e., T1 = 2 * D + W. If T1 is too large, it will occupy too much space; if T1 is too small, it will result in insufficient strength or an overly narrow cavity 30a, thus affecting thermal management performance. Therefore, when the total thickness T1 of the separator 33 is between 0.3 mm and 100 mm, space, strength, and thermal management can be balanced to ensure the performance of battery 100.

[0517] Optionally, the thickness D of the heat-conducting plate 333 is 0.1mm to 25mm.

[0518] If the thickness D of the heat-conducting plate 333 is too large, it will occupy too much space and the separator 33 will not be able to provide enough expansion space for the battery cell 20 in time. If D is too small, the strength will be too low. Therefore, when the thickness D of the heat-conducting plate 333 is 0.1mm to 25mm, it can balance space, strength and the expansion requirements of the battery cell 20, and ensure the performance of the battery 100.

[0519] Optionally, the dimension W of the cavity 30a in the first direction is 0.1 mm to 50 mm.

[0520] Specifically, the size W of the cavity 30a must be at least larger than the size of any impurity particles that may appear inside to prevent blockage during application. Furthermore, if the size W of the cavity 30a is too small, the flow resistance of the fluid inside the cavity will increase, resulting in poor heat transfer performance. Therefore, the size W of the cavity 30a should not be less than 0.1 mm. If the size W of the cavity 30a is too large, it will occupy too much space or lack sufficient strength. Therefore, a size W of 0.1 mm to 50 mm for the cavity 30a can balance space, strength, and thermal management performance, ensuring the performance of the battery 100.

[0521] Optionally, the dimension T1 of the partition 33 in the first direction x and the area S3 of the first wall 201 satisfy: 0.03 mm -1 ≤T1 / S3*1000≤2mm -1 .

[0522] If T1 and S3 meet the above conditions, the heat exchange performance and size requirements of the battery cell 20 can be satisfied. Specifically, when the area A of the first wall 201 of the battery cell 20 is larger, the cooling area is larger, which can reduce the thermal resistance from the separator 33 to the surface of the battery cell 20; when the total thickness W1 of the separator 33 is larger, the strength can be improved. If T1 / S3*1000 is less than 0.03mm -1 The area A of the first wall 201 of the battery cell 20 is large enough, but the separator 33 is too thin, resulting in insufficient strength. The separator 33 may break or crack during use. If T1 / S3*1000 is greater than 2mm... -1While the separator 33 is sufficiently thick, the area S3 of the first wall 201 of the battery cell 20 is too small. This results in insufficient cooling surface area provided by the separator 33 for the battery cell 20, posing a risk of failing to meet the heat dissipation requirements of the battery cell 20. Therefore, the total thickness T1 of the separator 33 and the area S3 of the first wall 201 must satisfy 0.03 mm. -1 ≤T1 / S3*1000≤2mm -1 At the same time, it can simultaneously meet the requirements of strength and thermal management performance, ensuring the performance of the battery 100.

[0523] Optionally, the partition 33 further includes a reinforcing rib 334, which is disposed between a pair of heat-conducting plates 333. The thickness X of the reinforcing rib 334 is not less than (-0.0005*F+0.4738) mm, where F is the tensile strength of the material of the reinforcing rib 334, in MPa. That is, the minimum thickness X of the reinforcing rib 334 can be (-0.0005*F+0.4738) mm.

[0524] The thickness X of the reinforcing rib 334 is related to the tensile strength of its material. According to the above relationship, to meet the stress requirements of the partition 33, a higher strength material is selected, and the thickness X of the internal reinforcing rib 334 can be thinner, thereby saving space and increasing energy density. Optionally, the thickness X of the reinforcing rib 334 can be 0.2mm to 1mm.

[0525] Adopting attachment Figure 45 The battery cell 20 and separator 33 shown in the figure were subjected to simulation tests on heating rate and deformation force of separator 33. The test results are shown in Table 10. In Table 10, L is the dimension of battery cell 20 in the second direction y, T3 is the dimension of battery cell 20 in the first direction x, and H2 is the dimension of the first wall 201 of battery cell 20 in the third direction z, which is perpendicular to the first direction x and the second direction y.

[0526] Table 10

[0527]

[0528]

[0529]

[0530] In some embodiments, such as Figure 47 , Figure 48 , Figure 50 and Figure 51As shown, the separator 33 is provided with a medium inlet 3412 and a medium outlet 3422. The cavity 30a connects the medium inlet 3412 and the medium outlet 3422 so that the cavity 30a can contain the heat exchange medium to regulate the temperature of the battery cell 20. The interior of the separator 33 is provided with a cavity 30b that is disconnected from both the medium inlet 3412 and the medium outlet 3422, so that the cavity 30b can prevent the heat exchange medium from entering. This not only regulates the temperature of the battery cell 20, but also reduces the weight of the separator 33, thereby achieving the weight reduction of the separator 33. During use, it can also alleviate the phenomenon of the heat exchange medium entering the cavity 30b and causing the weight increase of the separator 33. In this way, the weight of the battery 100 with this separator 33 can be effectively reduced, which is conducive to improving the energy density of the battery 100 and improving the performance of the battery 100.

[0531] For example, a medium inlet 3412 and a medium outlet 3422 are respectively located at both ends of a partition 33, and cavities 30a and 30b are both located inside the partition 33. Cavity 30a connects to the medium inlet 3412 and the medium outlet 3422, meaning that both ends of cavity 30a are interconnected with the medium inlet 3412 and the medium outlet 3422, allowing fluid media to flow into or out of cavity 30a. Cavity 30b is disconnected from both the medium inlet 3412 and the medium outlet 3422, meaning that cavity 30b does not form a communication relationship with either the medium inlet 3412 or the medium outlet 3422, preventing fluid media from entering cavity 30b.

[0532] It should be noted that there can be one or more cavities 30b disposed inside the partition 33, and similarly, there can be one or more cavities 30a disposed inside the partition 33. When there are multiple cavities 30a, each cavity 30a is connected to a medium inlet 3412 and a medium outlet 3422, that is, both ends of the multiple cavities 30a are respectively connected to the medium inlet 3412 and the medium outlet 3422. For example, in the embodiment of this application, there are multiple cavities 30a and cavities 30b disposed inside the partition 33.

[0533] In some embodiments, refer to Figure 47 and Figure 48 The partition 33 includes a main plate 331 (or body portion), a first busbar 341, and a second busbar 342. The main plate 331 is provided with a cavity 30a and a cavity 30b. Along the length direction of the main plate 331 (i.e., the second direction y), the first busbar 341 and the second busbar 342 are respectively disposed at both ends of the main plate 331, and the medium inlet 3412 and the medium outlet 3422 are respectively disposed at the first busbar 341 and the second busbar 342.

[0534] Both cavity 30a and cavity 30b are disposed inside the main body plate 331. For example, in... Figure 48 In the middle, both the cavity 30a and the cavity 30b extend along the length direction of the main body plate 331, and the two ends of the cavity 30a pass through the two ends of the main body plate 331 respectively, so that the cavity 30a can be connected to the medium inlet 3412 of the first manifold 341 and the medium outlet 3422 of the second manifold 342.

[0535] It should be noted that the main body plate 331, the first busbar 341 and the second busbar 342 can be an integral structure or a separate structure. When the main body plate 331, the first busbar 341 and the second busbar 342 are an integral structure, they can be made by casting or injection molding. When the main body plate 331, the first busbar 341 and the second busbar 342 are separate structures, they can be connected to both ends of the main body plate 331 by bolting, snap-fitting or bonding.

[0536] In some embodiments, such as Figures 48-51 As shown, the main body plate 331 has a channel 3151 inside, which passes through both ends of the main body plate 331 along its length. The partition plate 33 also includes a sealing member 318, which is connected to the main body plate 331 and blocks both ends of the channel 3151 to form a cavity 30b.

[0537] Along the length of the main body plate 331, both ends of the channel 3151 are provided with sealing components 318. After the two ends of the channel 3151 are sealed by the sealing components 318, a closed cavity 30b can be formed, thereby disconnecting the cavity 30b from the medium inlet 3412 and the medium outlet 3422.

[0538] For example, the sealing element 318 can be a metal sheet, a rubber plug, or a silicone plug. In actual production, different sealing elements 318 can be used depending on the size of the channel 3151. For example, when the channel 3151 is large, a metal sheet can be welded to one end of the main body plate 331 to seal the channel 3151. Alternatively, a rubber plug or a silicone plug can be used to seal the channel 3151. When the channel 3151 is small, there is a problem that welding the metal sheet is difficult. In this case, a rubber plug or a silicone plug can be inserted into the channel 3151 to achieve the sealing effect of the channel 3151.

[0539] In some embodiments, see Figures 48-51As shown, the sealing element 318 is detachably connected to the main body plate 331. This detachable connection allows for quick disassembly and replacement of the sealing element 318. This facilitates the sealing of different channels 3151 according to actual needs during use, meeting diverse requirements. Furthermore, it allows for maintenance and replacement of the sealing element 318, thus extending the service life of the partition plate 33.

[0540] For example, the sealing element 318 is snapped onto one end of the channel 3151 to block the channel 3151. Of course, in other embodiments, the sealing element 318 can also be detachably connected to the main body plate 331 by means of bolts or fasteners.

[0541] It should be noted that, in Figures 48-51 In this embodiment, cavity 30b is a sealed structure formed by sealing member 318 sealing the channel 3151 inside main body plate 331. See also other embodiments. Figure 50 As shown, the cavity 30b can also be a structure formed integrally with the main body plate 331. That is to say, the cavity 30b is a structure with an internal cavity formed by the main body plate 331 through casting or stamping processes, that is, the sealing part 318 and the main body plate 331 are an integral structure.

[0542] The main body plate 331 has a channel 3151 that runs through both ends of the main body plate 331 along its length. By providing a sealing member 318 on the main body plate 331, the sealing member 318 seals both ends of the channel 3151, thereby forming a cavity 30b that is disconnected from both the medium inlet 3412 and the medium outlet 3422. The structure is simple, easy to manufacture and process, and can seal different channels 3151 according to actual needs, thereby expanding the applicability of the partition plate 33.

[0543] In some embodiments, the interior of the first manifold 341 is formed with a first chamber communicating with the medium inlet 3412, the interior of the second manifold 342 is formed with a second chamber communicating with the medium outlet 3422, and the flow channel 30c passes through both ends of the main body plate 331 in the length direction of the main body plate 331 to communicate with the first chamber and the second chamber.

[0544] The first manifold 341 has a first chamber inside that communicates with the medium inlet 3412. That is, the first manifold 341 has a first chamber inside, and the medium inlet 3412 penetrates the cavity wall of the first chamber. When the first manifold 341 is installed at one end of the main body plate 331, the flow channel 30c penetrating one end of the main body plate 331 can communicate with the first chamber inside the first manifold 341. This allows multiple flow channels 30c to communicate with the first chamber of the first manifold 341, so that multiple flow channels 30c can communicate with the medium inlet 3412.

[0545] Similarly, the interior of the second manifold 342 is formed with a second chamber that communicates with the medium outlet 3422. That is, the interior of the second manifold 342 has a second chamber, and the medium outlet 3422 penetrates the cavity wall of the second chamber. When the second manifold 342 is installed at one end of the main body plate 331, the flow channel 30c penetrating one end of the main body plate 331 can communicate with the second chamber inside the second manifold 342. This allows multiple flow channels 30c to communicate with the second chamber of the second manifold 342, so that multiple flow channels 30c can communicate with the medium outlet 3422.

[0546] It should be noted that the cavity 30b is not connected to the first chamber of the first manifold 341 and the second chamber of the second manifold 342, thus disconnecting the cavity 30b from both the medium inlet 3412 and the medium outlet 3422.

[0547] The first manifold 341 is provided with a first chamber communicating with the flow channel 30c, and the second manifold 342 is provided with a second chamber communicating with the medium outlet 3422. This allows the flow channel 30c to communicate with both the first and second chambers after passing through both ends of the main body plate 331, so that the flow channel 30c can be connected to both the medium inlet 3412 and the medium outlet 3422. In this way, during use, fluid medium can be injected into multiple flow channels 30c simultaneously through the medium inlet 3412 and the medium outlet 3422 to improve the efficiency of use.

[0548] In some embodiments, see Figure 47 and Figure 48 As shown, both cavity 30b and cavity 30a extend along the length of the main body plate 331 and are arranged along the width direction (i.e., the third direction z) of the main body plate 331.

[0549] The partition 33 includes a cavity 30a and multiple cavities 30b. The cavity 30a corresponds to multiple flow channels 30c. Both the cavities 30b and the flow channels 30c extend along the length of the main body plate 331, and both are arranged along the width of the main body plate 331. The arrangement of the cavities 30b and flow channels 30c can be varied. For example, the cavities 30b and flow channels 30c can be arranged alternately, or along the width of the main body plate 331, with the cavities 30b located on one side of the flow channels 30c, or along the width of the main body plate 331, with multiple cavities 30b located in the middle of the main body plate 331, and flow channels 30c located on both sides of each cavity 30b. For example, in… Figure 48 Along the width direction of the main body plate 331, two flow channels 30c are provided in the middle position of the main body plate 331, and three cavities 30b are provided on both sides of the two flow channels 30c respectively, and a flow channel 30c is provided at both ends of the main body plate 331.

[0550] Both the cavity 30b and the flow channel 30c extend along the length of the main body plate 331 and are arranged along the width of the main body plate 331, which facilitates the processing and manufacturing of the cavity 30b and the flow channel 30c, and makes it easier to optimize the arrangement of the flow channel 30c, thereby improving the ability of the separator 33 to regulate the temperature of the battery 100.

[0551] In some embodiments, see Figure 48 and Figure 49 As shown, a flow channel 30c is provided at the middle position of the main body plate 331 along the width direction of the main body plate 331.

[0552] A flow channel 30c is provided at the middle position of the main body plate 331. If there is one flow channel 30c, it is located at the middle position of the main body plate 331. If there are multiple flow channels 30c, at least a portion of the multiple flow channels 30c are located at the middle position of the main body plate 331 in the width direction. For example, in Figure 48 and Figure 49 In the middle position of the main body plate 331 along the width direction of the main body plate 1, two flow channels 30c are provided. Of course, in other embodiments, one, three or four flow channels 30c can also be provided in the middle position of the main body plate 331 along the width direction of the main body plate 331.

[0553] The main plate 331 has a flow channel 30c in the middle of its width direction, which can exchange heat in the areas where heat is concentrated inside the battery 100, thus improving the thermal management performance of the separator 33 for the battery 100.

[0554] In some embodiments, refer to Figure 51 , Figure 51 This is a cross-sectional view of the main body plate 331 of the partition 33 provided in some embodiments of this application. The partition 33 is provided with a plurality of flow channels 30c and a plurality of cavities 30b, and the cavities 30b and flow channels 30c are arranged alternately along the width direction of the main body plate 331.

[0555] The cavity 30b and the flow channel 30c are arranged alternately, that is, the cavity 30b and the flow channel 30c are arranged alternately along the width direction of the main body plate 331. In other words, along the width direction of the main body plate 331, a cavity 30b is provided between two adjacent flow channels 30c, and a flow channel 30c is provided between two adjacent cavities 30b.

[0556] The cavities 30b and the flow channels 30c are arranged alternately along the width direction of the main body plate 331. That is, there are multiple cavities 30b and flow channels 30c, and they are arranged alternately to achieve a dispersed arrangement of flow channels 30c along the width direction of the main body plate 331. This can effectively reduce the uneven heat exchange capacity of the partition plate 33 caused by the concentration of flow channels 30c, thereby improving the performance of the partition plate 33.

[0557] In some embodiments, see Figure 49 As shown, along the thickness direction (i.e. the first direction x) of the main plate 331, the main plate 331 has two opposing side surfaces 3312, the area of ​​one side surface 3312 is S3, and the total area of ​​the projection of the flow channel 30c onto the side surface 3312 is S4, satisfying that S4 / S3≥0.2.

[0558] Among them, the area of ​​one side surface 3312 is 5, the total area of ​​the flow channel 30c projected on the side surface 3312 is S6, S6 / S5≥0.2, that is, the total area occupied by multiple flow channels 30c on the side surface 3312 of the main body plate 331 is greater than or equal to 20%.

[0559] By ensuring that the area occupied by multiple flow channels 30c on the side surface 3312 of the main body plate 331 is greater than or equal to 20%, the phenomenon of poor heat exchange capacity caused by insufficient area occupied by flow channels 30c can be reduced, thereby ensuring the heat exchange performance of the partition plate 33.

[0560] In some embodiments, see Figure 46 and Figure 47As shown, the cavities 30a of the multiple separators 33 are connected in series, meaning that the medium inlet 3412 of one separator 33 is connected to the medium outlet 3422 of another separator 33. Alternatively, the flow channels 30c of the multiple separators 33 can be connected in parallel, meaning that the medium inlets 3412 and outlets 3422 of the multiple separators 33 are interconnected. The battery 100 is provided with multiple separators 33, which improves the thermal management capability of the separators 33 for the battery cells 20, thereby reducing safety hazards caused by internal temperature rise in the battery 100.

[0561] In some embodiments, see Figure 46 and Figure 47 As shown, the medium outlet 3422 of one partition 33 is connected to the medium inlet 3412 of another partition 33.

[0562] The structure in which the medium outlet 3422 of one partition 33 is connected to the medium inlet 3412 of another partition 33 can be varied. It can be that the medium outlet 3422 of one partition 33 is connected to the medium inlet 3412 of another partition 33, or it can be connected through other components, such as connecting pipes, to realize the series structure of multiple partitions 33.

[0563] By connecting the medium outlet 3422 of one of the multiple baffles 33 to the medium inlet 3412 of another baffle 33, a series structure of multiple baffles 33 is realized, which facilitates assembly and processing, and allows fluid medium to be easily injected into the flow channel 30c of the multiple baffles 33 during use.

[0564] In some embodiments, the baffle 33 is provided with a plurality of flow channels 30c. Along the flow direction of the fluid medium in the flow channels 30c of the plurality of baffles 33, in two adjacent baffles 33, the number of flow channels 30c of the downstream baffle 33 is greater than the number of flow channels 30c of the upstream baffle 33.

[0565] Here, "flow direction of fluid medium" refers to the direction in which the fluid medium flows through the flow channels 30c of the multiple baffles 33. In two adjacent baffles 33, the number of flow channels 30c in the downstream baffle 33 is greater than the number of flow channels 30c in the upstream baffle 33. That is, in the flow direction of the fluid medium, in two adjacent baffles 33, the baffle 33 that the fluid medium passes through first is the upstream baffle 33, and the baffle 33 that the fluid medium passes through later is the downstream baffle 33. In other words, the fluid medium flows from the flow channel 30c of the upstream baffle 33 to the flow channel 30c of the downstream baffle 33.

[0566] By having more flow channels 30c in the downstream separator 33 than in the upstream separator 33, the heat exchange capacity of the downstream separator 33 is improved, thereby ensuring that the heat exchange capacity of multiple separators 33 is balanced, thus improving the overall thermal management capability and effectively alleviating the phenomenon of local temperature rise inside the battery 100.

[0567] In some embodiments, the medium inlets 3412 of the plurality of partitions 33 are interconnected, and the medium outlets 3422 of the plurality of partitions 33 are interconnected.

[0568] The medium inlets 3412 of the multiple baffles 33 can be directly connected or connected through other components, such as connecting pipes. Similarly, the medium outlets 3422 of the multiple baffles 33 are also connected in this way, so as to realize the parallel structure of the multiple baffles 33.

[0569] By connecting the medium inlets 3412 of multiple separators 33 to each other and the medium outlets 3422 of multiple separators 33 to each other, a parallel structure of multiple separators 33 is realized. This enables the simultaneous injection of fluid medium into the flow channels 30c of multiple separators 33, and effectively ensures the balanced heat exchange capacity of each separator 33, thereby effectively alleviating the phenomenon of local temperature rise inside the battery 100.

[0570] In some embodiments, such as Figure 24 As shown, a partition 335 is provided inside the cavity 30a. The partition 335 is used to divide the cavity 30a into at least two flow channels 30c, so as to control the distribution of the fluid medium inside the cavity according to actual needs, so as to reasonably adjust the temperature of the battery cell 20.

[0571] For example, multiple flow channels 30c can be arranged sequentially along a third direction z, and each flow channel 30c extends along a second direction y, which is perpendicular to the second direction and parallel to the first wall 201.

[0572] Each flow channel 30c can be independent or interconnected. Only some of the multiple flow channels 30c may contain the fluid medium, or all of them may contain the fluid medium. Therefore, the separator 335 divides the interior of the separator 33 into multiple flow channels 30c, facilitating the control of the distribution of the fluid medium within the separator 33 according to actual needs, thereby rationally regulating the temperature of the battery cell 20.

[0573] Optionally, the partition 335 and the partition plate 33 are integrally formed, for example, by a process such as casting or extrusion. Alternatively, the partition 335 and the partition plate 33 can be separate parts and then connected to the inner wall of the partition plate by welding, bonding, snap-fitting, or other methods.

[0574] Of course, only one flow channel 30c can be formed inside the cavity 30a.

[0575] In some embodiments, the separator 33 includes a main plate 331, the main plate 331 having a cavity 30a inside, the cavity 30a may have one or more flow channels 30c, and the insulating layer 32 includes a first insulating layer 32a, at least a portion of the first insulating layer 32a being disposed between the main plate 331 and the battery cell 20.

[0576] Further, see Figure 20 and Figure 21 The partition 33 also includes a manifold 332, which includes a manifold chamber 332a. Figure 26 , Figure 28 As shown in the figure, the manifold chamber 332a is connected to a plurality of flow channels 30c, and the insulating layer 32 includes a second insulating layer 32b. At least a portion of the second insulating layer 32b is disposed between the manifold 332 and the battery cell 20 to insulate and isolate the battery cell 20 and the manifold 332.

[0577] "The second insulating layer 32b covers at least a portion of the outer surface of the busbar 332" can be understood as the second insulating layer 32b partially covering at least a portion of the outer surface of the busbar 332 to insulate and isolate the battery cell 20 and the busbar 332.

[0578] Among them, the two manifolds 332 at both ends of the partition 33 can be the first manifold 341 and the second manifold 342, respectively.

[0579] Only a portion of the second insulating layer 32b may cover at least a portion of the outer surface of the first busbar 341, or only a portion of the second insulating layer 32b may cover at least a portion of the outer surface of the second busbar 342, or both the second insulating layer 32b and the second insulating layer 32b may cover at least a portion of the outer surface of the first busbar 341 and at least a portion of the outer surface of the second busbar 342.

[0580] When the second insulating layer 32b partially covers at least a portion of the surface of the first busbar 341, the second insulating layer 32b may only cover a portion of the outer surface of the first busbar 341. For example, the second insulating layer 32b may only cover the outer peripheral surface of the first busbar 341, while the two end faces of the first busbar 341 along the third direction z are not covered by the insulating layer 32. Compared to the case where the insulating layer 32 only covers the main body plate 331, this can increase the creepage distance between the battery cell 20 and the portion of the first busbar 341 not covered by the insulating layer 32, thereby reducing the risk of short circuit of the battery 100; or the insulating layer 32 may partially cover the entire outer surface of the first busbar 341.

[0581] In other embodiments, the insulating layer 32 may not cover the outer surface of the first busbar 341. The first busbar 341 extends along a third direction z, and the second busbar 342 extends along a third direction z.

[0582] When the second insulating layer 32b partially covers at least a portion of the surface of the second busbar 342, the portion of the insulating layer 32 may only cover a portion of the outer surface of the second busbar 342. For example, the portion of the insulating layer 32 may only cover the outer peripheral surface of the second busbar 342, while the two end faces of the second busbar 342 along the third direction z are not covered by the second insulating layer 32b. Compared to the case where the insulating layer 32 only covers the main body plate 331, this can increase the creepage distance between the battery cell 20 and the portion of the second busbar 342 not covered by the insulating layer 32, thereby reducing the risk of short circuit of the battery 100; or the portion of the second insulating layer 32b may cover the entire outer surface of the second busbar 342.

[0583] In other embodiments, such as Figure 27 , Figure 29 As shown, the insulating layer 32 may not cover the outer surface of the second busbar 342.

[0584] Therefore, the second insulating layer 32b covers at least a portion of the outer surface of the busbar 332. The second insulating layer 32b can completely cover the outer surface of the busbar 332, or it can only cover the side of the busbar 332 facing the battery cell 20. The second insulating layer 32b can be used to insulate and isolate the busbar 332 and the battery cell 20, thereby reducing the risk of battery short circuit and improving battery safety performance.

[0585] In this embodiment, the manifold 332 can be located on one side of the battery cell 20. Since the manifold 332 also contains a fluid medium, it can also be used to exchange heat with the battery cell 20. The second insulating layer 32b covers at least part of the outer surface of the manifold 332. The second insulating layer 32b can completely cover the outer surface of the manifold 332, or it can only cover the side of the manifold 332 facing the battery cell 20. The second insulating layer 32b can be used to insulate and isolate the manifold 332 and the battery cell 20, thereby reducing the risk of battery short circuit and improving battery safety performance.

[0586] Please refer to the above. Figure 20 , Figure 21 , Figure 25 and Figure 26In this embodiment, the two manifolds 332 are a first manifold 341 and a second manifold 342, respectively. The first manifold 341 is provided with a medium inlet 3412, and a first manifold chamber 3411 communicating with the medium inlet 3412 is formed inside the first manifold 341. The second manifold 342 is provided with a medium outlet 3422, and a second manifold chamber 3421 communicating with the medium outlet 3422 is formed inside the second manifold 342. Both the first manifold chamber 3411 and the second manifold chamber 3421 are connected to each flow channel 30c.

[0587] The medium inlet 3412 is located at the first manifold 341, and the medium outlet 3422 is located at the second manifold 342. The first manifold chamber 3411 of the first manifold 341 and the second manifold chamber 3421 of the second manifold 342 are both connected to each flow channel 30c. The fluid medium can enter the first manifold chamber 3411 from the medium inlet 3412, and then be distributed to each flow channel 30c through the first manifold chamber 3411. The fluid medium in each flow channel 30c can flow along the second direction Y to the second manifold 342 and collect in the second manifold chamber 3421, and be discharged from the medium outlet 3422.

[0588] In other embodiments, the baffle 33 may not have a manifold 332. Each flow channel 30c has a corresponding medium inlet 3412 and a medium outlet 3422. The fluid medium enters the flow channel 30c from its respective medium inlet 3412 and exits from its respective flow channel 30c. This arrangement facilitates independent control of the total amount and flow rate of the fluid medium in each flow channel 30c.

[0589] In this embodiment, the arrangement of the first manifold 341 facilitates the distribution of fluid medium to each flow channel 30c, which is beneficial to the uniformity of temperature regulation of the battery cell 20. The arrangement of the second manifold 342 facilitates the rapid discharge of fluid medium and improves heat exchange efficiency.

[0590] In some embodiments, such as Figure 25 and Figure 26 As shown, the thickness of the second insulating layer 32b is h3, and the wall thickness of the main plate 331 is h2. h3 / h2≥0.00625, which makes the creepage distance between the busbar 332 and the battery cell 20 larger, and the safety higher, thereby reducing the risk of electrical contact between the two in various usage scenarios.

[0591] h3 / h2 can be 0.01, 0.015, 0.1, 0.15, 0.2, 0.25, 0.3, 0.35, 0.4, etc.

[0592] In some embodiments, the insulating layer 32 has a uniform thickness structure, that is, the thickness h1 of the first insulating layer 30a is equal to the thickness h3 of the second insulating layer 30b, h1 = h3. In other embodiments, the thicknesses of the first insulating layer and the second insulating layer are not equal.

[0593] In some embodiments, please refer to Figure 20 , Figure 21 , Figures 25-29 The medium inlet 3412 is provided with a first guide tube 343, and the medium outlet 3422 is provided with a second guide tube 344; the insulating layer 32 also includes a third insulating layer 32c; a portion of the third insulating layer 32c covers the outer surface of the first guide tube 343 to insulate and isolate the battery cell 20 and the first guide tube 343; and / or, a portion of the third insulating layer 32c covers the outer surface of the second guide tube 344 to insulate and isolate the battery cell 20 and the second guide tube 344.

[0594] The medium inlet 3412 may be provided with a first guide pipe 343, or the medium outlet 3422 may be provided with a second guide pipe 344, or the medium inlet 3412 may be provided with a first guide pipe 343 and the medium outlet 3422 may be provided with a second guide pipe 344. Figure 21 and Figure 21 The diagram shows a case where the medium inlet 3412 is provided with a first guide pipe 343 and the medium outlet 3422 is provided with a second guide pipe 344.

[0595] like Figure 20 , Figure 21 , Figures 25-29 As shown, when the insulating layer 32 partially covers the outer surface of the first guide tube 343, the insulating layer 32 can only cover a portion of the outer surface of the first guide tube 343. For example, the insulating layer 32 may only cover the outer circumferential surface of the first guide tube 343, while the two end faces of the first guide tube 343 along the axial direction are not covered by the insulating layer 32. Compared to the case where the insulating layer 32 only covers the main body plate 331, the first busbar 341, and the second busbar 342, this can increase the creepage distance between the battery cell 20 and the portion of the first guide tube 343 not covered by the insulating layer 32, thereby reducing the risk of short circuit in the battery 100; or the insulating layer 32 may partially cover the entire outer surface of the first guide tube 343. In other embodiments, such as Figure 25 As shown, the insulating layer 32 may not cover the outer surface of the first guide tube 343.

[0596] like Figure 20 , Figure 21 , Figures 25-29As shown, when the insulating layer 32 partially covers the outer surface of the second guide tube 344, the insulating layer 32 can only cover a portion of the outer surface of the second guide tube 344. For example, the insulating layer 32 can only cover the outer circumferential surface of the second guide tube 344, while the two end faces of the second guide tube 344 along the axial direction are not covered by the insulating layer 32. Compared to the case where the insulating layer 32 only covers the main plate 331, the first busbar 341, and the second busbar 342, this can increase the creepage distance between the battery cell 20 and the portion of the second guide tube 344 not covered by the insulating layer 32, thereby reducing the risk of short circuit in the battery 100; or the insulating layer 32 can partially cover the entire outer surface of the second guide tube 344.

[0597] In other embodiments, the insulating layer 32 may not cover the outer surface of the second guide tube 344.

[0598] like Figure 20 , Figure 21 , Figures 25-29 As shown, the first guide tube 343 and the second guide tube 344 are arranged coaxially, and the axial direction of the first guide tube 343 and the axial direction of the second guide tube 344 are both parallel to the second direction y.

[0599] like Figure 20 , Figure 21 , Figures 25-29 As shown, one end of the first guide tube 343 is inserted into the medium inlet 3412 of the first manifold 341 and welded to the first manifold 341. One end of the second guide tube 344 is inserted into the medium outlet 3422 of the second manifold 342 and welded to the second manifold 342.

[0600] A first limiting portion 361 is provided on the outer peripheral surface of the first guide tube 343. The first limiting portion 361 protrudes radially from the outer peripheral surface of the first guide tube 343 and is used to limit the distance by which the first guide tube 343 is inserted into the first manifold 341. When the first guide tube 343 is inserted into the medium inlet 3412 of the first manifold 341, the first limiting portion 361 abuts against the outer wall of the first manifold 341. The first guide tube 343 can be welded to the first manifold 341 through the first limiting portion 361.

[0601] The outer peripheral surface of the second guide tube 344 is provided with a second limiting portion 371. The second limiting portion 371 protrudes radially from the outer peripheral surface of the second guide tube 344 and is used to limit the distance the second guide tube 344 can be inserted into the second manifold 342. When the second guide tube 344 is inserted into the medium outlet of the second manifold 342, the second limiting portion 371 abuts against the outer wall of the second manifold 342. The second guide tube 344 can be welded to the second manifold 342 through the second limiting portion 371.

[0602] In some other embodiments, the medium inlet 3412 may not be provided with the first guide pipe 343, and the medium outlet 3422 may not be provided with the second guide pipe 344.

[0603] The first guide pipe 343 facilitates the entry of fluid medium into the first junction chamber 3411 of the first manifold 341, and the second guide pipe 344 facilitates the discharge of fluid medium from the second junction chamber 3421 of the second manifold 342. Part of the insulating layer 32 covers the outer surface of the first guide pipe 343, providing insulation between the first guide pipe 343 and the battery cell 20, and / or part of the insulating layer 32 covers the outer surface of the second guide pipe 344, providing insulation between the second guide pipe 344 and the battery cell 20, thereby reducing the risk of short circuit in the battery 100 and improving the safety performance of the battery 100.

[0604] In some embodiments, along the second direction y, the first busbar 341 and the second busbar 342 are located on both sides of the battery cell 20, and the third direction z is perpendicular to the second direction y.

[0605] The first busbar 341 and the second busbar 342 are located on both sides of the battery cell 20, so that the arrangement direction of the first busbar 341 and the second busbar 342 is offset from the extension direction of the tab of the battery cell 20. This ensures that the first busbar 341 and the second busbar 342 are offset from the power output pole of the battery cell 20, thus avoiding the first busbar 341 and the second busbar 342 from affecting the charging and discharging of the battery cell 20 or from affecting the series, parallel or mixed connection between the individual battery cells 20.

[0606] like Figure 20 As shown, the main body plate 331 extends beyond the two ends of the battery cell 20 along the second direction y. The first busbar 341 and the second busbar 342 are respectively connected to the two ends of the main body plate 331 along the second direction y. Multiple battery cells 20 can be stacked along the second direction y without interfering with the first busbar 341 and the second busbar 342, allowing the multiple battery cells 20 to be arranged more compactly, which is beneficial to reducing the volume of the battery 100.

[0607] In some embodiments, the battery cell 20 includes a battery case 21 and an insulating layer (not shown) attached to the outer surface of the battery case 21, the insulating layer serving as an insulating barrier between the reinforcing member 30 and the battery case 21.

[0608] The insulating layer can be a blue film covering the outer surface of the battery box 21 or an insulating coating applied to the outer surface of the battery box 21. The surface of the battery box 21 of the battery cell 20 is connected to the insulating layer. The insulating layer on the battery cell 20 and the insulating layer 32 on the reinforcing member 30 together insulate and isolate the battery cell 20 and the reinforcing member 30, further reducing the risk of short circuit of the battery 100.

[0609] In some embodiments, such as Figures 52-64 As shown, the reinforcing member 30 includes a first heat-conducting plate 3331, a second heat-conducting plate 3332 and a separator 335 stacked together. The separator 335 is disposed between the first heat-conducting plate 3331 and the second heat-conducting plate 3332. The first heat-conducting plate 3331 and the separator 335 together define a first flow channel 34, and the second heat-conducting plate 3332 and the separator 335 together define a second flow channel 35.

[0610] When the reinforcing member 30 is disposed between two adjacent battery cells 20, the first flow channel 34 and the second flow channel 35 correspond to the two adjacent battery cells 20 respectively. The fluid medium in the first flow channel 34 and the fluid medium in the second flow channel 35 can exchange heat with the two battery cells 20 respectively, reducing the temperature difference between the two adjacent battery cells 20. The expansion of one battery cell 20 will not compress and reduce the size of the flow channel corresponding to the other battery cell 20 or will have little impact on the size of the flow channel corresponding to the other battery cell 20, thereby ensuring the heat exchange effect of the flow channel corresponding to the other battery cell 20, thereby ensuring the safety performance of the battery 100 using the reinforcing member 30.

[0611] Furthermore, the first flow channel 34 and the second flow channel 35 correspond to two adjacent battery cells 20, respectively, and can independently withstand the deformation caused by the expansion of their respective battery cells 20. Therefore, the expansion of one battery cell 20 has little or no interference with the expansion of the other battery cell 20, which is conducive to the expansion release of the two adjacent battery cells 20, reduces the mutual interference of the expansion of the two adjacent battery cells 20, and reduces the premature depressurization or serious thermal runaway accident caused by the expansion of the two adjacent battery cells 20, thereby improving the safety performance of the battery 100.

[0612] Both the first flow channel 34 and the second flow channel 35 are used to contain fluid media, which can flow within them. The first flow channel 34 and the second flow channel 35 can be independent of each other; fluid media in the first flow channel 34 will not enter the second flow channel 35, and fluid media in the second flow channel 35 will not enter the first flow channel 34.

[0613] For example, along the extension direction of the first flow channel 34, the first flow channel 34 has a first inlet and a first outlet located at both ends of the first flow channel 34, and the fluid medium enters the first flow channel 34 from the first inlet and exits the first flow channel 34 from the first outlet; along the extension direction of the second flow channel 35, the second flow channel 35 has a second inlet and a second outlet located at both ends of the second flow channel 35, and the fluid medium enters the second flow channel 35 from the second inlet and exits the second flow channel 35 from the second outlet.

[0614] The first flow channel 34 and the second flow channel 35 can be connected to each other, and the fluid medium in the first flow channel 34 can enter the second flow channel 35 or the fluid medium in the second flow channel 35 can enter the first flow channel 34.

[0615] In an embodiment where there is only one battery cell 20, the reinforcing member 30 is disposed on one side of the battery cell 20 and located between the battery cell 20 and the inner wall of the housing 10. The first flow channel 34 is disposed closer to the battery cell 20 than the second flow channel 35, and the second flow channel 35 is disposed closer to the inner wall of the housing 10 than the first flow channel 34.

[0616] In embodiments where there are multiple battery cells 20, the multiple battery cells 20 are stacked and arranged along a certain direction (the stacking direction of the first heat-conducting plate 3331, the second heat-conducting plate 3332 and the separator 335, the first direction x).

[0617] like Figure 53 and Figure 54 As shown, a reinforcing member 30 can be provided between two adjacent battery cells 20. For ease of description, the two adjacent battery cells 20 are defined as the first battery cell 21 and the second battery cell 22. The arrangement direction of the first flow channel 34 and the second flow channel 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 channel 34 and the second flow channel 35 is the same as the stacking direction of the first heat-conducting plate 3331, the second heat-conducting plate 3332, and the separator 335. The first flow channel 34 is provided corresponding to the first battery cell 21, and the first heat-conducting plate 3331 is used for thermally conductive connection with the first battery cell 21. The fluid medium in the first flow channel 34 is used for heat exchange with the first battery cell 21 to regulate the temperature of the first battery cell 21. The second flow channel 35 is provided corresponding to the second battery cell 22, and the second heat-conducting plate 3332 is used for thermally conductive connection with the second battery cell 22. The fluid medium in the second flow channel 35 is used for heat exchange with the second battery cell 22 to regulate the temperature of the second battery cell 22.

[0618] Thermally conductive connection refers to the ability to transfer heat between two components. For example, if the first heat-conducting plate 3331 is thermally connected to the first battery cell 21, heat can be transferred between the first battery cell 21 and the first heat-conducting plate 3331. This allows heat exchange between the fluid medium in the first flow channel 34 and the first battery cell 21. Similarly, if the second heat-conducting plate 3332 is thermally connected to the second battery cell 22, heat can be transferred between the second battery cell 22 and the second heat-conducting plate 3332. This allows heat exchange between the fluid medium in the second flow channel 35 and the second battery cell 22.

[0619] like Figure 53 and Figure 54 As shown, the fluid medium in the first flow channel 34 and the fluid medium in the second flow channel 35 can exchange heat with the two battery cells 20 respectively, reducing the temperature difference between the two adjacent battery cells 20. The expansion of one battery cell 20 will not compress or reduce the size of the flow channel corresponding to the other battery cell 20 or will have little impact on the size of the flow channel corresponding to the other battery cell 20, thereby ensuring the heat exchange effect of the flow channel corresponding to the other battery cell 20, and thus ensuring the safety performance of the battery 100 using the reinforcing member 30. For example, if the battery cell 20 (first battery cell 21) corresponding to the first flow channel 34 expands, the size of the first flow channel 34 in the stacking direction (i.e., the first direction x) of the first heat-conducting element, the second heat-conducting element, and the separator will decrease. However, the first battery cell 21 will not affect the size of the second flow channel 35 in the stacking direction of the first heat-conducting plate 3331, the second heat-conducting plate 3332, and the separator 335, or the effect on the size of the second flow channel 35 in the stacking direction of the first heat-conducting plate 3331, the second heat-conducting plate 3332, and the separator 335 will be very small, thereby ensuring the heat exchange capacity of the second flow channel 35 for the corresponding battery cell 20 (second battery cell 22). Similarly, the expansion of the battery cell 20 (second battery cell 22) corresponding to the second flow channel 35 will reduce the size of the second flow channel 35 in the stacking direction of the first heat-conducting plate 3331, the second heat-conducting plate 3332 and the separator 335. However, the second battery cell 22 will not affect the size of the first flow channel 34 in the stacking direction of the first heat-conducting plate 3331, the second heat-conducting plate 3332 and the separator 335 or has little effect on the size of the first flow channel 34 in the stacking direction of the first heat-conducting plate 3331, the second heat-conducting plate 3332 and the separator 335, thereby ensuring the heat exchange capacity of the first flow channel 34 for the corresponding battery cell 20 (second battery cell 22).

[0620] Since the first flow channel 34 and the second flow channel 35 correspond to two adjacent battery cells 20 respectively, they can independently withstand the deformation caused by the expansion of their respective battery cells 20. Therefore, the expansion of one battery cell 20 has little or no interference with the expansion of the other battery cell 20, which is beneficial to the expansion release of the two adjacent battery cells 20 and reduces the risk of premature pressure release or serious thermal runaway accidents caused by mutual interference of the expansion of the two adjacent battery cells 20, thereby further improving the safety performance of the battery 100. In addition, the fluid medium in the first flow channel 34 and the fluid medium in the second flow channel 35 can exchange heat with the two battery cells 20 respectively, reducing the temperature difference between the two adjacent battery cells 20, thereby ensuring the safety performance of the battery 100 using the reinforcing member 30.

[0621] The number of first flow channels 34 can be one or more, and the number of second flow channels 35 can be one or more. In some embodiments, there are multiple first flow channels 34, and / or multiple second flow channels 35.

[0622] The number of first flow channels 34 can be multiple, and the number of second flow channels 35 can be one; the number of first flow channels 34 can be one, and the number of second flow channels 35 can be multiple; or the number of first flow channels 34 can be multiple, and the number of second flow channels 35 can be multiple. In the embodiment where there are multiple first flow channels 34, the first heat-conducting plate 3331 and the separator 33 jointly define multiple first flow channels 34, which are arranged sequentially along a third direction z, and each first flow channel 34 extends along a second direction y. The third direction z is perpendicular to the second direction y. In the embodiment where there are multiple second flow channels 35, the second heat-conducting plate 3332 and the separator 33 jointly define multiple second flow channels 35, which are arranged sequentially along a third direction z, and each second flow channel 35 extends along the second direction y.

[0623] In other embodiments, the arrangement directions of the plurality of first flow channels 34 and the arrangement directions of the plurality of second flow channels 35 may be different. The extension directions of the first flow channels 34 and the extension directions of the second flow channels 35 may also be different. Of course, the extension directions of the plurality of first flow channels 34 may be different, and the extension directions of the plurality of second flow channels 35 may also be different.

[0624] The presence of multiple first flow channels 34 and / or multiple second flow channels 35 allows the reinforcing member 30 to accommodate more fluid medium and makes the fluid medium distribution more uniform, which is beneficial to improving heat exchange efficiency and heat exchange uniformity, and reducing the temperature difference in different areas of the battery cell 20.

[0625] There are various ways to form the first flow channel 34. In some embodiments, such as... Figures 55-59As shown, the separator 335 is provided with a first groove 3351, which forms part of the first flow channel 34.

[0626] "The portion of the first groove 3351 that forms the first flow channel 34" refers to the portion where the groove wall of the first groove 3351 serves as the wall of the first flow channel 34. The first groove 3351 can take various forms, such as... Figure 56 As shown, along the stacking direction of the first heat-conducting plate 3331, the second heat-conducting plate 3332, and the separator 335, the separator 335 has a first surface 3352 facing the first heat-conducting plate 3331 and a second surface 3353 facing the second heat-conducting plate 3332. The first surface 3352 and the second surface 3353 are arranged opposite to each other. A first groove 3351 is provided on the first surface 3352 and recessed towards the second surface 3353. For example, as... Figure 58 As shown, a first groove 3351 is disposed on a 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.

[0627] The first groove 3351 penetrates at least one end of the separator 335 along the second direction y. In this embodiment, the first groove 3351 penetrates both ends of the separator 335 along the second direction y, so that the fluid medium can flow in from one end of the first flow channel 34 along the second direction y and flow out from the other end of the first flow channel 34 along the second direction y.

[0628] The first groove 3351 provided on the separator 335 forms part of the first flow channel 34. While ensuring that the cross-sectional area of ​​the first flow channel 34 is sufficient, the size of the thermal management component 30 along the stacking direction of the first heat-conducting plate 3331, the second heat-conducting plate 3332 and the separator 335 is reduced.

[0629] like Figures 55-58 As shown, in some embodiments, the first heat-conducting plate 3331 blocks the slot of the first groove 3351 facing the first heat-conducting plate 3331 to form a first flow channel 34.

[0630] In some embodiments, the side of the first heat-conducting plate 3331 facing the separator 335 abuts against the first surface 3352, so that the first heat-conducting plate 3331 blocks the slot of the first groove 3351 facing the first heat-conducting plate 3331, thereby forming a first flow channel 34. In other words, the first heat-conducting plate 3331 forms another part of the first flow channel 34. Therefore, in the embodiment where the side of the first heat-conducting plate 3331 facing the separator 335 abuts against the first surface 3352, the groove wall of the first groove 3351 serves as part of the wall of the first flow channel 34, and the surface of the first heat-conducting plate 3331 facing the separator 335 serves as another part of the wall of the first flow channel 34. The side of the first heat-conducting plate 3331 facing the separator 335 abuts against the first surface 3352. This can be either the surface of the first heat-conducting plate 3331 facing the separator 335 in contact with the first surface 3352 but without connection, or the surface of the first heat-conducting plate 3331 facing the separator 335 in contact with and connected to the first surface 3352, such as through welding.

[0631] In other embodiments, the first surface 3352 is not provided with the first groove 3351, and there is a gap between the side of the first heat-conducting plate 3331 facing the separator 33 and the first surface 3352. In this case, the first groove 3351, the first surface 3352 and the first heat-conducting plate 3331 together define the first flow channel 34.

[0632] The first heat-conducting plate 3331 blocks the groove of the first groove 3351 facing the first heat-conducting plate 3331 to form a first flow channel 34, so that the first heat-conducting plate 3331 and the separator 335 are arranged more compactly in the stacking direction of the first heat-conducting plate 3331, the second heat-conducting plate 3332 and the separator 445, thereby reducing the size of the thermal management component 30 along the stacking direction of the first heat-conducting plate 3331, the second heat-conducting plate 3332 and the separator 445.

[0633] In some other embodiments, the first surface 3352 of the separator 335 is not provided with the first groove 3351, there is a gap between the side of the first heat-conducting plate 3331 facing the separator 335 and the first surface 3352, the first surface 3352 forms part of the wall of the first flow channel 34, and the surface of the first heat-conducting plate 3331 facing the separator 335 forms another part of the wall of the first flow channel 34.

[0634] There are several ways to form the second flow channel 35, such as Figures 55-58 As shown, in some embodiments, the separator 33 is provided with a second groove 3355, which forms a portion of the second flow channel 35.

[0635] "The portion of the second groove 3355 that forms the second flow channel 35" refers to the portion of the groove wall of the second groove 3355 that serves as the wall of the second flow channel 35. The second groove 3355 can take various forms, such as... Figure 55 As shown, along the stacking direction of the first heat-conducting plate 3331, the second heat-conducting plate 3332, and the separator, the second groove 3355 is disposed on the second surface 3353 and recessed towards the first surface 3352. For example, as... Figure 57 As shown, 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.

[0636] The second groove 3355 penetrates at least one end of the separator 335 along the second direction y. In this embodiment, the second groove 3355 penetrates both ends of the separator 335 along the second direction y, so that the fluid medium can flow in from one end of the second flow channel 35 along the second direction Z and flow out from the other end of the second flow channel 35 along the second direction Z.

[0637] The second groove 3355 provided on the separator 335 forms part of the second flow channel 35. While ensuring that the cross-sectional area of ​​the second flow channel 35 is sufficient, the size of the thermal management component 30 along the stacking direction of the first heat-conducting plate 3331, the second heat-conducting plate 3332 and the separator 335 is reduced.

[0638] like Figures 55-58 As shown, in some embodiments, the second heat-conducting plate 3332 blocks the slot of the second groove 3355 facing the second heat-conducting plate 3332 to form a second flow channel 35.

[0639] In some embodiments, the side of the second heat-conducting plate 3332 facing the separator 335 abuts against the second surface 3353, so that the second heat-conducting plate 3332 blocks the slot of the second groove 3355 facing the second heat-conducting plate 3332, thereby forming a second flow channel 35. In other words, the second heat-conducting plate 3332 forms another part of the first flow channel 34. Therefore, in the embodiment where the side of the second heat-conducting plate 3332 facing the separator 335 abuts against the second surface 3353, the groove wall of the second groove 3355 serves as part of the wall of the second flow channel 35, and the surface of the second heat-conducting plate 3332 facing the separator 335 serves as another part of the wall of the second flow channel 35. The side of the second heat-conducting plate 3332 facing the separator 335 abuts against the second surface 3353. This can be either the surface of the second heat-conducting plate 3332 facing the separator 335 or the second surface 3353 in contact but without connection, or the surface of the second heat-conducting plate 3332 facing the separator 335 and the second surface 3353 in contact and connected, such as by welding.

[0640] In other embodiments, the second surface 3353 does not have a second groove 3355, and there is a gap between the side of the second heat-conducting plate 3332 facing the separator 335 and the second surface 3353. In this case, the second groove 3355, the second surface 3353 and the second heat-conducting plate 3332 together define the second flow channel 35.

[0641] The second heat-conducting plate 3332 blocks the groove of the second groove 3355 facing the second heat-conducting plate 3332 to form a second flow channel 35, so that the second heat-conducting plate 3332 and the separator 335 are arranged more compactly in the stacking direction of the first heat-conducting plate 3331, the second heat-conducting plate 3332 and the separator, thereby reducing the size of the reinforcing member 30 along the stacking direction of the first heat-conducting plate 3331, the second heat-conducting plate 3332 and the separator 335.

[0642] Please continue to refer to Figures 55-58 In embodiments where there are multiple first flow channels 34, there are multiple first grooves 3351, which are arranged along a third direction z, perpendicular to the stacking direction of the first heat-conducting plate 3331, the second heat-conducting plate 3332, and the separator 335. The first heat-conducting plate 3331 blocks the openings of the multiple first grooves 3351 facing the first heat-conducting plate 3331, thereby forming multiple first flow channels 34.

[0643] In embodiments where there are multiple second flow channels 35, there are multiple second grooves 3355, which are arranged along a third direction z, perpendicular to the stacking direction of the first heat-conducting plate 3331, the second heat-conducting plate 3332, and the separator 335. The second heat-conducting plate 3332 blocks the slots of the multiple second grooves 3355 facing the second heat-conducting plate 3332, thereby forming multiple second flow channels 35.

[0644] The separator 335 may have multiple first grooves 3351 on the first surface 3352 and one second groove 3355 or no second groove 3355 on the second surface 3353; or the separator 335 may have multiple second grooves 3355 on the second surface 3353 and one first groove 3351 or no first groove 3351 on the first surface 3352; or the separator 335 may have multiple first grooves 3351 on the first surface 3352 and multiple second grooves 3355 on the second surface 3353.

[0645] Multiple first grooves 3351 can form multiple first flow channels 34; and / or multiple second grooves 3355 can form multiple second flow channels 35, so that the reinforcing member 30 can accommodate more fluid medium and make the fluid medium distribution more uniform, which is beneficial to improving heat exchange efficiency and heat exchange uniformity, and reducing the temperature difference in different areas of the battery cell 20.

[0646] Please refer to Figures 55-58 The first groove 3351 and the second groove 3355 are arranged alternately along the third direction z.

[0647] "The first groove 3351 and the second groove 3355 are arranged alternately in the third direction z" means that, along the stacking direction of the first heat-conducting plate 3331, the second heat-conducting plate 3331 and the separator 335, at least 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 / or, along the stacking direction of the first heat-conducting plate 3331, the second heat-conducting plate 3331 and the separator 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, so that the first flow channel 34 and the second flow channel 35 are arranged alternately in the third direction z.

[0648] Figures 55-56 The diagram shows the case where, along the stacking direction of the first heat-conducting plate 3331, the second heat-conducting plate 3332, and the separator, the projection of each second groove 3355 on the first surface 3352 is entirely located between two adjacent first grooves 3351. Figures 57-58 The diagram shows the stacking direction of the first heat-conducting plate 3331, the second heat-conducting plate 3332 and the separator, where a portion of the projection of each second groove 3355 on the first surface 3352 along the third direction z is located between two adjacent first grooves 3351, and another portion of the projection of each second groove 3355 on the first surface 3352 along the third direction z overlaps with the first groove 3351.

[0649] The first groove 3351 and the second groove 3355 are arranged alternately along the third direction z, so that the first flow channel 34 and the second flow channel 35 are arranged alternately along the third direction z. When the thermal management component 30 is located between two adjacent battery cells 20, the temperature distribution of the battery cell 20 corresponding to the first flow channel 34 along the third direction z is relatively uniform, and the temperature distribution of the battery cell 20 corresponding to the second flow channel 35 along the third direction z is also relatively uniform.

[0650] Please refer to Figures 57-59 In some embodiments, the separator 335 is a corrugated plate, which has a simple structure and is easy to manufacture.

[0651] In this embodiment, a first groove 3351 is disposed on a 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; a 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 along the third direction z, and the first protrusion 3354 and the second protrusion 3356 are alternately arranged along the third direction z, thereby forming a corrugated plate.

[0652] In other embodiments, the separator 335 may also be a component with other structural forms, such as Figure 55 and Figure 56 As shown.

[0653] like Figure 60 As shown, the first flow channel 34 can also be formed in other forms. For example, in some other embodiments, the separator 335 includes a body portion 3357 and a first separator portion 3358. The two ends of the first separator portion 3358 along the first direction x are respectively connected to the body portion 3357 and the first heat-conducting plate 3331. The body portion 3357, the first separator portion 3358 and the first heat-conducting plate 3331 together define the first flow channel 34.

[0654] Both the main body 3357 and the first partition 3358 are flat plate structures, defining a first space between the main body 3357 and the first heat-conducting plate 3331. The number of first partitions 3358 can be one or more. In embodiments with multiple first partitions 3358, the multiple first partitions 3358 are arranged at intervals along a first direction Y, dividing the first space into multiple first sub-spaces. Thus, the main body 3357, the first heat-conducting plate 3331, and the multiple first partitions 3358 together define multiple first flow channels 34. The main body 3357 and the first partition 3358 can be integrally formed, for example, by casting, extrusion, or other integral molding processes. Alternatively, the main body 3357 and the first partition 3358 can be separately arranged and then connected into a whole by welding, soldering, screw connection, or other methods.

[0655] The main body 3357, the first partition 3358, and the first heat-conducting plate 3331 together define a plurality of first flow channels 34, which allows the reinforcing member 30 to accommodate more fluid medium and make the fluid medium distribution more uniform, which is beneficial to improving heat exchange efficiency and heat exchange uniformity, reducing the temperature difference in different areas of the battery cell 20, and the first partition 3358 can support the first heat-conducting plate 3331, enhancing the ability of the first heat-conducting plate 3331 to resist deformation.

[0656] The second flow channel 35 can also be formed in other ways, for example, please refer to [reference needed]. Figure 13 The separator 33 also includes a second separator 3359. The two ends of the second separator 3359 along the second direction Z are respectively connected to the main body 3357 and the second heat-conducting plate 3332. The main body 3357, the second separator 3359 and the second heat-conducting plate 3332 together define the second flow channel 35.

[0657] Both the main body 3357 and the second partition 3359 are flat plate structures, defining a second space between the main body 3357 and the second heat-conducting plate 3332. The number of second partitions 3359 can be one or more. In embodiments with multiple second partitions 3359, the multiple second partitions 3359 are arranged at intervals along the first direction Y, dividing the second space into multiple second sub-spaces, thereby defining multiple second flow channels 35 together with the main body 3357, the second heat-conducting plate 3332, and the multiple second partitions 3359. The main body 3357 and the second partition 3359 can be integrally formed, for example, by casting, extrusion, or other integral molding processes. Alternatively, the main body 3357 and the second partition 3359 can be separately arranged and then connected as a whole by welding, soldering, screw connection, or other methods. Furthermore, the main body 3357, the first partition 3358, and the second partition 3359 can be integrally formed.

[0658] The main body 3357, the second partition 3359, and the second heat-conducting plate 3332 together define a plurality of second flow channels 35, which allows the reinforcing member 30 to accommodate more fluid medium and make the fluid medium distribution more uniform, which is beneficial to improving heat exchange efficiency and heat exchange uniformity, reducing the temperature difference in different areas of the battery cell 20, and the second partition 3359 can support the first heat-conducting plate 3331 and enhance the ability of the second heat-conducting plate 3332 to resist deformation.

[0659] The first flow channel 34 and the second flow channel 35 can extend in the same direction or in different directions. In this embodiment, the extension direction of the first flow channel 34 is the same as the extension direction of the second flow channel 35. Both the first flow channel 34 and the second flow channel 35 extend along the second direction y, which facilitates manufacturing.

[0660] For the fluid medium flowing in the first flow channel 34 and the second flow channel 35, along the flow direction of the fluid medium, the heat exchange capacity between the fluid medium in the first flow channel 34 and the corresponding battery cell 20 gradually weakens. For example, the reinforcing member 30 is used to cool the battery cell 20. Along the flow direction of the fluid medium, the temperature of the fluid medium located in the first flow channel 34 and the second flow channel 35 will gradually increase, and the cooling capacity of the higher temperature fluid medium for the battery cell 20 will be weakened.

[0661] Based on the above considerations, in some embodiments, along the extending directions of the first flow channel 34 and the second flow channel 35, the first flow channel 34 has a first inlet (not shown in the figure) and a first outlet (not shown in the figure), and the second flow channel 35 has a second inlet (not shown in the figure) and a second outlet (not shown in the figure), and the direction from the first inlet to the first outlet is opposite to the direction from the second inlet to the second outlet.

[0662] The first inlet supplies fluid medium into the first flow channel 34, and the first outlet supplies fluid medium out of the first flow channel 34; the second inlet supplies fluid medium into the second flow channel 35, and the second outlet supplies fluid medium out of the second flow channel 35.

[0663] For example, such as Figure 61 As shown, in an embodiment where reinforcing members 30 are provided on both sides of the battery cell 20, one side of the battery cell 20 corresponds to the first flow channel 34 of one reinforcing member 30, and the other side of the battery cell 20 corresponds to the second flow channel 35 of another reinforcing member 30. In this case, the fluid medium on both sides of the battery cell 20 flows in opposite directions. Along the extension direction (second direction y) of the first flow channel 34 and the second flow channel 35, the heat exchange capacity of the fluid medium in the first flow channel 34 and the fluid medium in the second flow channel 35 can complement each other, thereby reducing the local temperature difference of the battery cell 20.

[0664] Therefore, the direction from the first inlet to the first outlet is opposite to the direction from the second inlet to the second outlet. That is, the flow direction of the fluid medium in the first flow channel 34 is opposite to the flow direction of the fluid medium in the second flow channel 35. The heat exchange effect is better in the area of ​​the battery cell 20 closer to the inlet of the corresponding flow channel, and worse in the area of ​​the battery cell 20 closer to the outlet of the corresponding flow channel. This arrangement of the first flow channel 34 and the second flow channel 35 can reduce the local differences in the thermal management of the battery cells 20 in the battery 100, making the heat exchange more uniform.

[0665] like Figure 62 As shown, in some embodiments, the reinforcing member 30 includes a communicating cavity 36 located at one end of the separator 335, a first flow channel 34 communicating with the communicating cavity 36, and a second flow channel 35 communicating with the communicating cavity 36.

[0666] The connecting cavity 36 is located at one end of the separator 33, and the separator 335, the first heat-conducting plate 3331, and the second heat-conducting plate 3332 together define the connecting cavity 36. In this embodiment, the connecting cavity 36 is the gap between the end of the separator 335 and the first heat-conducting plate 3331 and the second heat-conducting plate 3332 in the second direction y.

[0667] In other embodiments, the connecting cavity 36 may also be formed by other structures. For example, the reinforcing member 30 may also include a connecting pipe, through which the first flow channel 34 and the second flow channel 35 are connected. The internal channel of the connecting pipe is the connecting cavity 36.

[0668] The number of first flow channels 34 and second flow channels 35 can both be multiple. In embodiments where there are multiple first flow channels 34, all first flow channels 34 may be connected to the connecting cavity 36. In this case, the fluid medium in each first flow channel 34 exits from the first outlet, passes through the connecting cavity 36, and enters the second flow channel 35 through the second inlet. In other embodiments, some of the multiple first flow channels 34 may be connected to the connecting cavity 36. The fluid medium in these first flow channels 34 exits from the first outlet, passes through the connecting cavity 36, and enters the second flow channel 35 through the second inlet. Other portions of the multiple first flow channels 34 may not be connected to the connecting cavity 36, and the fluid medium in these first flow channels 34 cannot enter the second flow channel 35. Figure 62 The hollow arrows in the diagram indicate the direction of the fluid medium's flow within the first flow channel 34 and the second flow channel 35.

[0669] In embodiments where there are multiple second flow channels 35, all second flow channels 35 may be connected to the connecting cavity 36. In this case, the fluid medium in the first flow channel 34, after being discharged from the first outlet, can enter each second flow channel 35 through the connecting cavity 36 and then through the second inlet. In other embodiments, some of the multiple second flow channels 35 may be connected to the connecting cavity 36. The fluid medium in the first flow channel 34 connected to the connecting cavity 36 passes through the connecting cavity 36 and then enters the second flow channel 35 connected to the connecting cavity 36 through the second inlet. Other portions of the multiple second flow channels 35 may not be connected to the connecting cavity 36, in which case the fluid medium in the first flow channel 34 cannot enter these second flow channels 35.

[0670] In this embodiment, there are multiple first flow channels 34 and second flow channels 35, and each first flow channel 34 and each second flow channel 35 is connected to the connecting cavity 36.

[0671] The number of first flow channels 34 and second flow channels 35 can be the same or different.

[0672] The first flow channel 34 is connected to the connecting cavity 36, and the second flow channel 35 is connected to the connecting cavity 36. The fluid medium in the first flow channel 34 can flow into the second flow channel 35, and the fluid medium flowing out from the outlet (first outlet) of the first flow channel 34 flows into the inlet (second inlet) of the second flow channel 35. This arrangement can reduce the local differences in the thermal management of the battery cells 20 in the battery 100, making the heat exchange more uniform.

[0673] Please refer to Figure 25 , Figure 26 , Figure 62 , Figure 63 In some embodiments, the reinforcing member 30 includes a medium inlet 3412 and a medium outlet 3422. The medium inlet 3412 is connected to the connecting cavity 36 through a first flow channel 34, and the medium outlet 3422 is connected to the connecting cavity 36 through a second flow channel 35.

[0674] The medium inlet 3412 is located on the first heat-conducting plate 3331 and is connected to the first flow channel 34. The medium outlet 3422 is located on the second heat-conducting plate 3332 and is connected to the second flow channel 35.

[0675] The fluid medium enters the first flow channel 34 through the medium inlet 3412, flows into the second flow channel 35 through the connecting cavity 36, and is discharged from the medium outlet 3422. During the flow process, the fluid medium exchanges heat with the battery cell 20. Figure 62 and Figure 63 The hollow arrows in the diagram indicate the direction of the fluid medium's flow within the first flow channel 34 and the second flow channel 35.

[0676] The arrangement of the medium inlet 3412 and the medium outlet 3422 facilitates the entry of the fluid medium into the first flow channel 34 and the second flow channel 35, and facilitates the discharge of the fluid medium from the first flow channel 34 and the second flow channel 35 after heat exchange with the battery cell 20, so that the fluid medium that has not undergone heat exchange can enter the first flow channel 34 and the second flow channel 35, thereby ensuring the heat exchange capacity of the fluid medium in the first flow channel 34 and the second flow channel 35.

[0677] Please refer to Figure 62 , Figure 63 In some embodiments, along the extension direction of the first flow channel 34, the medium inlet 3412 is disposed at the end of the first heat-conducting plate 3331 away from the connecting cavity 36; along the extension direction of the second flow channel 35, the medium outlet 3422 is disposed at the end of the second heat-conducting plate 3332 away from the connecting cavity 36.

[0678] The extension direction of the first flow channel 34 and the extension direction of the second flow channel 35 are both parallel to the second direction y. In other embodiments, the extension directions of the first flow channel 34 and the second flow channel 35 may be different. For example, the extension direction of the first flow channel 34 may be parallel to the second direction y, and the extension direction of the second flow channel 35 may be parallel to a preset direction. The angle between the preset direction and the second direction Z may be an acute angle, or the preset direction may be perpendicular to the second direction y and perpendicular to the first direction x.

[0679] The medium inlet 3412 is provided with a medium inflow pipe 37, which facilitates the connection between the medium inlet 3412 and the equipment that provides the fluid medium. The medium outlet 3422 is provided with a medium outflow pipe 38, which facilitates the connection between the medium outlet 3422 and the equipment that recovers the fluid medium.

[0680] The medium inlet 3412 is located at the end of the first heat-conducting plate 3331 away from the connecting cavity 36, and the medium outlet 3422 is located at the end of the second heat-conducting plate 3332 away from the connecting cavity 36. The fluid medium enters the first flow channel 34 from the medium inlet 3412 and flows through the entire first flow channel 34 along the extension direction of the first flow channel 34 and enters the second flow channel 35. After flowing through the entire second flow channel 35 along the extension direction of the second flow channel 35, it is discharged from the medium outlet 3422. This maximizes the path that the fluid medium travels within the thermal management component 30, thereby maximizing heat exchange with the battery cell 20 and improving heat exchange efficiency and uniformity.

[0681] like Figure 62 , Figure 63 As shown, in some embodiments, the end of the first flow channel 34 that is away from the connecting cavity 36 along its extension direction is not connected to the end of the second flow channel 35 that is away from the connecting cavity 36 along its extension direction.

[0682] In this embodiment, the extending directions of the first flow channel 34 and the second flow channel 35 are both parallel to the second direction y. The connecting cavity 36 is located at one end of the separator 33 along the second direction y. Figure 63 As shown, the reinforcing member 30 also includes a sealing member 39 (or a plugging member), which is disposed at one end of the partition member 335 away from the connecting cavity 36 along the second direction y, to block the end of the second flow channel 35 away from the connecting cavity 36 along the second direction y, thereby preventing the fluid medium entering the first flow channel 34 from the medium inlet 3412 from flowing into the second flow channel 35 in the direction away from the connecting cavity 36 within the first flow channel 34. Of course, in some other embodiments, the sealing member 39 disposed at one end of the partition member 335 away from the connecting cavity 36 along the second direction y can also be used to block one end of the first flow channel 34 away from the connecting cavity 36 along the second direction y, thereby preventing the fluid medium entering the first flow channel 34 from the medium inlet 3412 from flowing into the second flow channel 35 in the direction away from the connecting cavity 36 within the first flow channel 34.

[0683] The sealing element 39 and the partition element 335 can be separate components, and then connected into a whole structure, for example, by welding, bonding or other methods. Alternatively, the sealing element 39 and the partition element 335 can be integrally formed, for example, through casting, stamping or other integral forming processes.

[0684] Along the stacking direction of the first heat-conducting plate 3331, the second heat-conducting bar 3332 and the separator 335, the projection of the medium outlet 3422 on the separator 353 is located on the side of the plugging member 39 facing the connecting cavity 36, so that the fluid medium in the second flow channel 35 can be discharged from the medium inlet 3412.

[0685] The end of the first flow channel 34 that is away from the connecting cavity 36 along its extension direction is not connected to the end of the second flow channel 35 that is away from the connecting cavity 36 along its extension direction. Therefore, after the fluid medium enters the first flow channel 34, it can only flow through the entire first flow channel 34 and then enter the second flow channel 35 from the connecting cavity 36 and flow through the entire second flow channel 35 before being discharged from the medium outlet 3422. This ensures that the fluid medium has the longest path within the thermal management component 30, so as to fully exchange heat with the battery cell 20 and improve heat exchange efficiency and heat exchange uniformity.

[0686] In some embodiments, there are multiple first flow channels 34 and second flow channels 35, and each first flow channel 34 and each second flow channel 35 is connected to the communication cavity 36.

[0687] In other embodiments, the number of first flow channels 34 may be one, and the number of second flow channels 35 may be multiple, with each second flow channel 35 communicating with the connecting cavity 36; or the number of first flow channels 34 and the number of second flow channels 35 may both be one; or the number of second flow channels 35 may be one, and the number of first flow channels 34 may be multiple, with each first flow channel 34 communicating with the connecting cavity 36.

[0688] The first flow channel 34 and the second flow channel 35 are both connected by multiple uniformly connected cavities 36. The fluid medium in each first flow channel 34 can flow into each second flow channel 35, and the fluid medium flowing out from the outlet of the first flow channel 34 flows into the second flow channel 35 from the inlet of the second flow channel 35. This arrangement can reduce the local differences in the thermal management of the battery cells 20 in the battery 100, making the heat exchange more uniform.

[0689] In embodiments where there are multiple first flow channels 34, the number of medium inlets 3412 can be set differently, for example, please refer to the reference. Figure 53 , Figure 63 In some embodiments, there is one medium inlet 3412, and each first flow channel 34 connects the connecting cavity 36 and the medium inlet 3412.

[0690] In an embodiment where the sealing element 39 blocks the end of the second flow channel 35 away from the communicating cavity 36, such as Figure 63 As shown, the side of the sealing member 39 facing away from the connecting cavity 36 forms a flow divider gap 310 between the first heat-conducting plate 3331 and the second heat-conducting plate 3332. The medium inlet 3412 is connected to each first flow channel 34 through the flow divider gap 310. The fluid medium flowing in from the medium inlet 3412 enters the flow divider gap 310 and is then distributed from the flow divider gap 310 to each first flow channel 34.

[0691] Therefore, having only one medium inlet 3412 facilitates the synchronous flow of fluid medium into each of the first flow channels 34. Furthermore, the limited number of medium inlets 3412 on the first heat-conducting plate 3331 reduces the impact of the medium inlets 3412 on the structural strength of the first heat-conducting plate 3331. This also simplifies the structure of the structural reinforcement 30 and makes it easier to manufacture.

[0692] In other embodiments, there are multiple medium inlets 3412, and each first flow channel 34 connects to a connecting cavity 36 and a medium inlet 3412.

[0693] The number of medium inlets 3412 is the same as the number of first flow channels 34, and they correspond one-to-one. Each medium inlet 3412 allows the fluid medium to flow into the corresponding first flow channel 34, which facilitates independent control of the fluid medium entering each first flow channel 34 and allows control of the fluid medium entering the required first flow channel 34 according to actual needs, thereby controlling the distribution of the fluid medium inside the heat regulation tube so as to reasonably regulate the temperature of the battery cell 20.

[0694] In embodiments where there are multiple second flow channels 35, such as Figure 52 As shown, there are multiple medium outlets 3422, and each second flow channel 35 is connected to a connecting cavity 36 and a medium outlet 3422.

[0695] There are multiple second flow channels 35 and multiple medium outlets 3422. The medium outlets 3422 and the second flow channels 35 are set in a one-to-one correspondence. The fluid medium in each second flow channel 35 is discharged from the corresponding medium outlet 3422.

[0696] In other embodiments, there may be a single medium outlet 3422, which is connected to each of the second channels 35, and the fluid medium in all the second channels 35 is discharged from the medium outlet 3422.

[0697] Each second flow channel 35 is connected to a connecting cavity 36 and a medium outlet 3422, so that the fluid medium can be discharged from the second flow channel 35 more quickly, thereby improving the heat exchange efficiency.

[0698] In some embodiments, the separator 335 is a one-piece molded structure.

[0699] The separator 335 can be a structure formed in one piece by stamping, casting, or other molding methods. In embodiments where the separator 335 is a corrugated plate, the corrugated plate is formed by stamping. The separator 335 is a one-piece molded structure, which is easy to manufacture and has good structural strength.

[0700] In some embodiments, the first heat-conducting plate 3331 may be an integrally formed structure, and the second heat-conducting plate 3332 may be an integrally formed structure, for example, both the first heat-conducting plate 3331 and the second heat-conducting plate 3332 may be formed by casting or stamping.

[0701] In some embodiments, the first heat-conducting plate 3331 is welded to the separator 335, and / or the second heat-conducting plate 3332 is welded to the separator 335.

[0702] Alternatively, the first heat-conducting plate 3331 may be welded to the separator 335, while the second heat-conducting plate 3332 and the separator 335 may be connected by other means (such as bonding), or the second heat-conducting plate 3332 may be in contact with the separator 335 but not connected. In this embodiment, both the first heat-conducting plate 3331 and the second heat-conducting plate 3332 are welded to the separator 335.

[0703] In the embodiment where the partition plate 335 is a corrugated plate, the first heat-conducting plate 3331 is welded to the second protrusion 3356, and the second heat-conducting plate 3332 is welded to the first protrusion 3354 (please refer to...). Figure 58 This connection method enables the separator 335 to support the first heat-conducting plate 3331 and the second heat-conducting plate 3332, thereby improving the ability of the first heat-conducting plate 3331 and the second heat-conducting plate 3332 to resist the expansion and deformation of the battery cell 20.

[0704] The first heat-conducting plate 3331 and the separator 335 are connected by welding, which improves the connection stability of the first heat-conducting plate 3331 and the separator 335; the second heat-conducting plate 3332 and the separator 335 are connected by welding, which improves the connection stability of the second heat-conducting plate 3332 and the separator 335.

[0705] like Figure 64 As shown, the battery 100 includes an adjacent first battery cell 21, a second battery cell 22 and a reinforcing member 30. The reinforcing member 30 is disposed between the first battery cell 21 and the second battery cell 22. The first heat-conducting plate 3331 is thermally connected to the first battery cell 21 and the second heat-conducting plate 3332 is thermally connected to the second battery cell 22.

[0706] The fluid medium in the first flow channel 34 and the fluid medium in the second flow channel 35 can exchange heat with the first battery cell 21 and the second battery cell 22 respectively, thereby reducing the temperature difference between the first battery cell 21 and the second battery cell 22.

[0707] The expansion of the first battery cell 21 will not compress or reduce the size of the second flow channel 35 corresponding to the second battery cell 22, or will have a very small impact on the size of the second flow channel 35 corresponding to the second battery cell 22, thereby ensuring the heat exchange capacity of the second flow channel 35 corresponding to the second battery cell 22; the expansion of the second battery cell 22 will not compress or reduce the size of the first flow channel 34 corresponding to the first battery cell 21, or will have a very small impact on the size of the first flow channel 34 corresponding to the first battery cell 21, thereby ensuring the heat exchange capacity of the first flow channel 34 corresponding to the first battery cell 21, thereby ensuring the safety performance of the battery 100 using the reinforcing member 30.

[0708] Furthermore, the first flow channel 34 and the second flow channel 35 correspond to the first battery cell 21 and the second battery cell 22, respectively. Therefore, the first flow channel 34 can withstand the deformation caused by the expansion of the first battery cell 21, and the second flow channel 35 can withstand the deformation caused by the expansion of the second battery cell 22. Thus, the expansion of the first battery cell 21 has little interference with the expansion of the second battery cell 22 or does not affect the expansion of the second battery cell 22, and the expansion of the second battery cell 22 has little interference with the expansion of the first battery cell 21 or does not affect the expansion of the first battery cell 21. This is conducive to the release of the expansion of the first battery cell 21 and the second battery cell 22, reducing the mutual interference of the expansion of the first battery cell 21 and the second battery cell 22, which could lead to premature depressurization or serious thermal runaway accidents, and further improves the safety performance of the battery 100.

[0709] Please continue to refer to Figure 64 In some embodiments, a reinforcing member 30 may also be provided on the side of the first battery cell 21 that is away from the second battery cell 22, and a reinforcing member 30 may also be provided on the side of the second battery cell 22 that is away from the first battery cell 21.

[0710] For ease of description, the reinforcing member 30 located between the first battery cell 21 and the second battery cell 22 is defined as the first reinforcing member, the reinforcing member 30 located on the side of the first battery cell 21 away from the second battery cell 22 is defined as the second reinforcing member, and the reinforcing member 30 located on the side of the second battery cell 22 away from the first battery cell 21 is defined as the third reinforcing member.

[0711] The fluid medium in the first flow channel 34 of the first reinforcing member flows in the opposite direction to the fluid medium in the second flow channel 35. The fluid medium in the first flow channel 34 of the second reinforcing member flows in the opposite direction to the fluid medium in the second flow channel 35. The fluid medium in the first flow channel 34 of the third reinforcing member flows in the opposite direction to the fluid medium in the second flow channel 35.

[0712] The second heat-conducting plate 3332 of the second reinforcing member is thermally connected to the side of the first battery cell 21 opposite to the second battery cell 22. The flow direction of the fluid medium in the first flow channel 34 of the first reinforcing member is opposite to the direction of the reinforcing member 30 in the second flow channel 35 of the second reinforcing member. In this way, the heat exchange capacity of the fluid medium on both sides of the first battery cell 21 along the second direction y can complement each other, thereby reducing the local temperature difference of the first battery cell 21.

[0713] The first heat-conducting plate 3331 of the third reinforcing member is thermally connected to the side of the second battery cell 22 opposite to the first battery cell. The flow direction of the fluid medium in the second flow channel 35 of the first reinforcing member is opposite to the direction of the reinforcing member 30 in the first flow channel 34 of the third reinforcing member. In this way, the heat exchange capacity of the fluid medium on both sides of the second battery cell 22 along the second direction y can complement each other, thereby reducing the local temperature difference of the second battery cell 22.

[0714] In some embodiments, such as Figures 65-82 As shown, at least a portion of the reinforcing member 30 is configured to deform under pressure, so that the reinforcing member 30 provides a certain expansion space for the battery cell 20, which helps to reduce the compressive force between the reinforcing member 30 and the battery cell 20.

[0715] In some embodiments, such as Figure 65 As shown, the reinforcing member 30 includes a heat exchange layer 400 and a compressible layer 500 arranged in layers. The heat exchange layer 400 can improve the heat exchange efficiency of the battery cell 20 and improve the heat dissipation capacity of the battery cell 20. The elastic modulus of the compressible layer 500 is smaller than that of the heat exchange layer 400. After being subjected to the expansion force released by the battery cell 20, the compressible layer 500 can deform along the direction of the expansion force of the battery cell 20, thereby absorbing the expansion part of the battery cell 20, ensuring the expansion space of the battery cell 20, avoiding large deformation of the entire battery 100, and the compressible layer 500 is conducive to absorbing tolerances during battery assembly, facilitating installation and maintaining the compact structure of the battery.

[0716] The heat exchange layer 400 is a layered structure used for heat exchange with the battery cell 20. When the temperature of the battery cell 20 is higher than the temperature of the heat exchange layer 400, the heat of the battery cell 20 is conducted to the heat exchange layer 400, causing the temperature of the battery cell 20 to drop; when the temperature of the battery cell 20 is lower than the heat exchange layer 400, the heat of the heat exchange layer 400 is conducted to the battery cell 20, causing the temperature of the battery cell 20 to rise.

[0717] The compressible layer 500 is a layered structure with large compression deformation after being subjected to force.

[0718] Optionally, when the compressible layer 500 is subjected to a force along the stacking direction, the compressible layer 500 can be compressed along the stacking direction and produce a large deformation.

[0719] The elastic modulus is the direct proportionality between stress and strain in a material or structure during the elastic deformation stage. Under the premise of the same stress during the elastic deformation stage, the larger the elastic modulus, the smaller the deformability of the material or structure; the smaller the elastic modulus, the greater the deformability of the material or structure.

[0720] The heat exchange layer 400 can have one or more layers, and the compressible layer 500 can also have one or more layers.

[0721] As an example, such as Figure 66 As shown, the reinforcing member 30 includes a heat exchange layer 400 and a compressible layer 500; as Figure 67 As shown, the reinforcing member 30 includes two heat exchange layers 400 and one compressible layer 500, with the compressible layer 500 disposed between the two heat exchange layers 400; as Figure 68 As shown, the reinforcing member 30 includes a heat exchange layer 400 and two compressible layers 500, with the heat exchange layer 400 disposed between the two compressible layers 500.

[0722] In some embodiments, the compressible layer 500 includes a compressible cavity 501, which is a cavity whose volume decreases after the compressible layer 500 is subjected to a force.

[0723] After being subjected to the expansion force released by the battery cell 20, the gas in the compressible cavity 501 is compressed, thereby causing the compressible layer 500 to deform along the direction of the expansion force of the battery cell 20.

[0724] In some embodiments, the compressible cavity 501 is filled with a phase change material or an elastic material.

[0725] Phase change materials (PCMs) are substances that change their physical state and provide latent heat while maintaining a constant temperature. The process of changing physical properties is called a phase change process, during which the PCM absorbs or releases a large amount of latent heat.

[0726] Elastic materials are materials with low elastic modulus. Elastic materials can undergo large deformations under the expansion force of battery cells.

[0727] When the compressible cavity 501 is filled with a phase change material, the heat capacity of the battery can be increased, enabling the reinforcing member 30 to insulate the battery cell 20 or absorb the heat of the battery cell 20. When the compressible cavity 501 is filled with an elastic material, the elastic material has good elasticity. After being subjected to the expansion force released by the battery cell, the elastic material is compressed, thereby causing the compressible layer 500 to deform along the direction of the expansion force of the battery cell 20, and to rebound after the expansion force disappears. In addition, the elastic material can also increase the support strength of the compressible layer 500.

[0728] Optionally, the elastic material includes rubber.

[0729] In some embodiments, the heat exchange layer 400 includes a heat exchange cavity 401 (also referred to as the cavity 30a described above) for accommodating the heat exchange medium. The heat exchange medium is a medium used for heat exchange with the battery cells, generally a liquid with a high specific heat capacity and which can maintain fluidity at the battery operating temperature.

[0730] Optionally, the heat exchange chamber 401 can be sealed or open.

[0731] In some embodiments, such as Figure 69 As shown, a first support member 410 (also referred to as the reinforcing rib mentioned above) is provided in the heat exchange cavity 401. The first support member 410 is a structure that supports the heat exchange cavity 401 to prevent the heat exchange cavity 401 from being squeezed and deformed. The first support member 410 can be used to improve the strength of the heat exchange layer 400, thereby avoiding large deformation of the heat exchange layer 400 after being subjected to the expansion force released by the battery cell.

[0732] Optionally, the elastic modulus of the first support 410 is greater than the elastic modulus of the compressible layer 500.

[0733] Since the elastic modulus of the compressible layer 500 is less than that of the first support 410, it is more prone to deformation. After the reinforcement 30 is subjected to the expansion force released by the battery cell, the compressible layer 500 can undergo a large deformation along the direction of the expansion force of the battery cell 20, while the heat exchange layer 400 will not undergo deformation.

[0734] In some embodiments, the heat exchange layer 400 and the compressible layer 500 are stacked along a first direction, and the first support member 410 is supported in the heat exchange cavity 401 along the first direction x.

[0735] When the reinforcing member 30 is applied to the battery, the battery cell 20 is generally made to abut against the reinforcing member 30 along the first direction x. The expansion force released by the battery cell 20 is also basically along the first direction x. The first support member 410 supported in the heat exchange cavity 401 along the first direction x can greatly improve the elastic modulus of the heat exchange layer 400. After the reinforcing member 30 is subjected to the expansion force released by the battery cell along the first direction x, the compressible layer 500 can undergo a large deformation along the first direction x, while the heat exchange layer 400 basically does not deform.

[0736] In some embodiments, see Figure 67 The compressible layer 500 is disposed in the heat exchange cavity 401.

[0737] Both ends of the reinforcing member 30 along the stacking direction are heat exchange chambers 401, which can effectively improve the heat exchange efficiency of the battery cells at both ends of the reinforcing member 30, so that the temperature of the entire battery is kept at a low level.

[0738] In some embodiments, such as Figure 70 As shown, the heat exchange cavity 401 is also provided with a first connecting structure 420 (also referred to as the first reinforcing rib mentioned above) for fixing the compressible layer 500 in the heat exchange cavity 401.

[0739] The first connection structure 420 has two ends connected to the inner wall of the heat exchange cavity 401 and the outer wall of the compressible layer 500, respectively. The first connection structure 420 can fix the compressible layer 500 to prevent the position of the compressible layer 500 relative to the heat exchange cavity 401 from changing.

[0740] Optionally, at least a portion of the first connecting structure 420 is disposed in the heat exchange cavity 401 along the stacking direction. The first connecting structure 420 can fix the compressible layer 500 on the one hand, and can also be used to improve the strength of the heat exchange layer 400, thereby preventing the heat exchange layer 400 from undergoing large deformation after being subjected to the expansion force released by the battery cell.

[0741] 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 a first connecting structure 420 is disposed in the heat exchange space and divides the heat exchange space into a flow channel 402 (also referred to as a flow channel 30c).

[0742] Multiple flow channels 402 facilitate the circulation of the heat exchange medium in the heat exchange space, avoiding excessively high temperatures in localized reinforcing members 30.

[0743] Optionally, the heat exchange cavity 401 is provided with a plurality of first connection structures 420.

[0744] Optionally, the elastic modulus of the first connecting structure 420 is greater than the elastic modulus of the compressible layer 500.

[0745] In some embodiments, see Figures 71-74 The compressible layer 500 includes a first compressible tube 510, and the heat exchange layer 400 includes a first heat exchange tube 430. The first compressible tube 510 is sleeved in the first heat exchange tube 430.

[0746] The first compressible tube 510 is a tubular structure with an internal compressible cavity 501 and can be deformed by compression.

[0747] The first heat exchange tube 430 is a tubular structure with an internal heat exchange cavity 401, and the heat exchange cavity 410 is provided with at least one first connecting structure 420. The end of the at least one first connecting structure 420 defines a first mounting cavity 431 for which the first compressible tube 510 is disposed.

[0748] The reinforcing member 30 of this application is formed by the first compressible tube 510 and the first heat exchange tube 430, which is beneficial to the forming of the reinforcing member 30.

[0749] Optionally, after the first compressible tube 510 and the first heat exchange tube 430 are fitted together, the end of at least one of the first connecting structures 420 in the first heat exchange tube 430 abuts against the outer wall of the first compressible tube 510.

[0750] Optionally, the reinforcing member 30 has a third direction z corresponding to the height direction of the battery cell after being installed in the battery, and two first connecting structures 420 extending along the third direction z are provided in the first heat exchange tube 430, and the two first connecting structures 420 are respectively provided at both ends of the first heat exchange tube 430 along the third direction z.

[0751] Optionally, the first heat exchange tube 430 has two opposing first contact surfaces 432 for abutting against the large surface of the battery cell, i.e., the first wall 201. The first contact surfaces 432 can increase the contact area between the first heat exchange tube 430 and the battery cell, thereby improving the heat exchange capacity of the reinforcing member 30 to the battery cell.

[0752] Optionally, the first compressible tube 510 has two opposing first mating surfaces 511 for engaging with the large surface of the battery cell, i.e., the first wall 201. The expansion deformation of the battery cell is generally along a direction perpendicular to the large surface, and the first mating surfaces 511 can deform under the expansion force of the battery cell, thereby absorbing the expansion portion of the battery cell.

[0753] In some embodiments, optionally, please refer to Figure 68 The heat exchange layer 400 is disposed in the compressible cavity 501.

[0754] The reinforcing member 30 has heat exchange chambers 401 at both ends along the stacking direction, which can effectively improve the deformation capability of the reinforcing member 30. After being subjected to the expansion force released by the battery cells at both ends along the stacking direction, the reinforcing member 30 can generate better deformation to absorb the expansion released by the battery cells.

[0755] In some embodiments, the compressible layer 500 includes a thermally conductive wall that defines a compressible cavity 501.

[0756] The thermally conductive wall is a wall structure with a compressible layer of 500 and good thermal conductivity.

[0757] As an example, the material of the thermally conductive wall can be thermally conductive silicone, metal, etc.

[0758] The outer wall of the compressible layer 500 is a heat-conducting wall, which effectively conducts the heat of the battery cell to the internal heat exchange layer 400 for heat exchange.

[0759] In some embodiments, see Figures 75-78 , Figure 75 This is a schematic diagram of the structure of the second heat exchange tube in some embodiments of this application. Figure 76 This is a schematic diagram of the structure of the second compressible tube according to some embodiments of this application. Figure 77 This is a side view of a second compressible tube according to some embodiments of this application. Figure 78 This is a schematic diagram of the assembled structure of the second compressible tube and the second heat exchange tube according to some embodiments of this application. The compressible layer 500 includes the second compressible tube 520, and the heat exchange layer 400 includes the second heat exchange tube 440, which is sleeved in the second compressible tube 520.

[0760] The second heat exchange tube 440 is a tubular structure with an internal heat exchange cavity 401.

[0761] The second compressible tube 520 is a tubular structure with an internal compressible cavity 501, and at least one second connecting structure 530 is provided in the compressible cavity 501. The end of the at least one second connecting structure 530 defines a second mounting cavity 521 for which the second heat exchange tube 440 is provided.

[0762] The reinforcing member 30 of this application is formed by the second compressible tube 520 and the second heat exchange tube 440, which is beneficial to the forming of the reinforcing member 30.

[0763] Optionally, after the second compressible tube 520 and the second heat exchange tube 440 are fitted together, the end of at least one of the second connecting structures 530 in the second compressible tube 520 abuts against the outer wall of the second heat exchange tube 440.

[0764] Optionally, the reinforcing member 30 has a third direction z corresponding to the height direction of the battery cell after being installed in the battery, and two second connecting structures 530 extending along the third direction z are provided inside the second compressible tube 520, and the two second connecting structures 530 are respectively provided at both ends of the second compressible tube 520 along the third direction z.

[0765] Optionally, the second compressible tube 520 has two opposing second mating surfaces 522 for abutting against the large surface of the battery cell 20, i.e., the first wall 201. 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 capacity of the reinforcing member 30 for the battery cell 20. Furthermore, since the expansion deformation of the battery cell 20 is generally along a direction perpendicular to the large surface, the second mating surfaces 522 can deform under the expansion force of the battery cell 20, thereby absorbing the expansion capacity of the battery cell 20.

[0766] Optionally, the second heat exchange tube 440 has two opposing second contact surfaces 441 for engaging with the large surface of the battery cell 20, i.e., the first wall 201. The two second contact surfaces 441 correspond to two second mating surfaces 522 and absorb the heat conducted from the two second mating surfaces 522.

[0767] Optionally, the second heat exchange tube 440 is provided with a plurality of second support members 450.

[0768] The inner wall of the heat exchange chamber 401 defines the heat exchange space, and multiple second support members 450 are disposed in the heat exchange space and divide the heat exchange space into multiple flow channels 402.

[0769] Optionally, the elastic modulus of the second support 450 is greater than that of the compressible layer 500.

[0770] In some embodiments, see Figure 65 , Figure 79 and Figure 80 The reinforcing member 30 also includes a flow collector 106, which includes a flow chamber 1061. The flow chamber 1061 is connected to the heat exchange chamber 401. Both the flow chamber 1061 and the heat exchange chamber 401 are sealed and isolated from the compressible chamber 501.

[0771] The current collector 106 is a component that connects the heat exchange layer 400 to the container for storing the heat exchange medium.

[0772] The flow chamber 1061 is a cavity inside the flow collecting element 106 that connects the heat exchange chamber 401 and the container for storing the heat exchange medium.

[0773] The current collector 106 can be used to connect the container storing the heat exchange medium, so that the heat exchange medium in the heat exchange chamber 401 can circulate. The compressible chamber 501 and the heat exchange chamber 401 are not connected, so that the heat exchange medium cannot enter the compressible chamber 501, thus preventing the compressible chamber 501 from deforming after being subjected to the expansion force released by the battery cell 20, which would cause the heat exchange medium to overflow.

[0774] Optionally, the current collecting element 106 further includes an inlet / outlet port 1062, which is connected to the flow chamber 1061.

[0775] Optionally, the reinforcing member 30 includes a current collector 106, which is disposed at one end of the heat exchange layer 400. One end of the heat exchange layer 400 is open, and the liquid flow chamber 1061 is connected to the heat exchange chamber 401 through the opening at one end.

[0776] Optionally, the reinforcing member 30 includes two current collectors 106, which are respectively disposed at both ends of the heat exchange layer 400. The heat exchange layer 400 has openings at both ends, and two flow chambers 1061 are respectively connected to the heat exchange chamber 401 through the openings at both ends.

[0777] Optionally, the reinforcing member 30 also includes a connector, which is a hollow structure and is sealed to the inlet / outlet port 1062 with one end open.

[0778] See also Figure 64 and 84 , Figure 81 This is a schematic diagram of the structure of the reinforcing member 30 and the battery cell 20 after assembly according to some embodiments of this application. When the reinforcing member 30 is applied to the battery 100, the reinforcing member 30 can be disposed between two adjacent battery cells 20, and the two opposite surfaces of the reinforcing member 30 respectively abut against the two adjacent large surfaces of the two adjacent battery cells 20; the reinforcing member 30 can also be disposed between the housing 10 and the battery cell 20 near the housing 10.

[0779] Each reinforcement 30 can be individually connected to the heat exchange medium storage container, or the inlet and outlet ports 1062 of adjacent reinforcements 30 can be connected via pipes 107.

[0780] In some embodiments, see Figure 65 and Figure 82 The heat exchange layer 400 and the compressible layer 500 extend along the second direction 33, and at least one end of the compressible layer 500 protrudes from the heat exchange layer 400 along the second direction 33.

[0781] The compressible layer 500 protrudes from the heat exchange layer 400, which helps to seal and isolate the flow chamber 1061 of the current collector 106 from the compressible chamber 501, so that the heat exchange medium cannot enter the compressible chamber 501, and avoids the compressible chamber 501 from deforming after being subjected to the expansion force released by the battery cell, which would cause the heat exchange medium to overflow.

[0782] Optionally, a compressible layer 500 is disposed in the heat exchange chamber 401. The flow collector element 106 includes a through hole extending along the second direction y. A portion of the compressible layer 500 protruding from the heat exchange layer 400 passes through the through hole and is sealed to one end of the through hole. The other end of the through hole is sealed to the outer wall of the heat exchange layer 400. An outflow chamber 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 collector element 106.

[0783] In some embodiments, optionally, please refer to Figure 65 The compressible cavity 501 is provided with an air inlet 502 and an air outlet 503.

[0784] The compressible layer 500 can be air-cooled through the air inlet 502 and the air outlet 503, and together with the heat exchange layer 400, it can further improve the heat exchange efficiency of the reinforcing member 30 for the battery.

[0785] In some embodiments, such as Figures 83-92 As shown, the reinforcing member 30 includes a housing 50 and a support member 60. The support member 60 is housed within the housing 50 and is used to define a separately disposed cavity 30a and a deformable cavity 40a within the housing 50. The cavity 30a is used for the flow of heat exchange medium, and the deformable cavity 40a is configured to deform when the housing 50 is under pressure.

[0786] Therefore, the heat exchange medium in the cavity 30a heats or cools the battery cell 20. When the battery cell 20 inside the housing 10 expands during use, the deformation cavity 40a inside the outer shell 50 allows the outer shell 50 to deform under the force of the battery cell 20. This prevents the outer shell 50 of the reinforcing member 30 from having an excessive reaction force on the battery cell 20, absorbs the tolerance of the battery cell 20 in the group, avoids damage to the battery cell 20, reduces the reduction in the heat exchange area of ​​the reinforcing member 30 and the battery cell 20, and improves the cycle performance of the battery cell 20.

[0787] The reinforcing member 30 can be provided at the bottom or side of the housing to make full contact with the battery cell 20, or between two adjacent battery cells 20.

[0788] The cavity 30a has open ends, allowing the heat exchange medium to flow. This heat exchange medium provides the cavity 30a with a certain strength, preventing it from being compressed or deformed. The deformable cavity 40a has closed ends, preventing the heat exchange medium from entering. The deformable cavity 40a accounts for 10%-90% of the volume, making it prone to deformation. The outer shell 50 and the supporting component 60 can be made from the same material using a one-piece molding process. The outer shell 50 can also be made from a material with greater elasticity than the supporting component 60, allowing the deformable cavity 40a to deform when the outer shell 50 is subjected to the expansion force of the battery cell 20.

[0789] Optionally, the battery cell 20 is located between two adjacent reinforcing members 30, and multiple reinforcing members 30 are connected by connecting pipes to achieve connection between the various reinforcing members 30 and circulation of the heat exchange medium.

[0790] In some embodiments, the support member 60 and the housing 50 enclose a cavity 30a. The support member 60 may be connected to the housing 50 to form a cavity 30a. There may be multiple cavities 30a, which are arranged adjacently or at intervals to provide sufficient heat exchange for the battery cell 20.

[0791] In the above scheme, the outer shell 50 is configured to directly contact the battery cell 20. The support member 60 and the outer shell 50 together form a cavity 30a, through which the heat exchange medium can contact the battery cell 20 through the outer shell 50, thereby improving the heat exchange efficiency of the battery cell 20.

[0792] like Figure 86 and Figure 88 As shown, the support component 60 includes a partition component 61 and a support component 62. The partition component 61 is used to define a cavity 30a and a deformable cavity 40a that are separated within the housing 50. The support component 62 is used to be disposed within the cavity 30a or to define the cavity 30a together with the partition component 61, so as to support the cavity 30a.

[0793] The partition component 61 is connected to the support component 62 and to the outer shell 50, respectively, to define the cavity 30a and the deformable cavity 40a. The support component 62 can be disposed inside the cavity 30a to support the cavity 30a, or the support component 62 can serve as a side of the cavity 30a, connected to the outer shell 50 and the partition component 61, to enclose and form the cavity 30a, thus also supporting the cavity 30a.

[0794] In the above scheme, the interior of the outer shell 50 is divided into a cavity 30a and a deformation cavity 40a by the partition component 61, and the cavity 30a is supported by the support component 62, which improves the strength of the cavity 30a. This prevents the volume of the cavity 30a from decreasing when the reinforcing member 30 absorbs expansion and tolerances, and changes in the flow rate of the heat exchange medium inside the cavity 30a, thus preventing the heat exchange medium from overflowing. At the end of the battery's life cycle, the cavity 30a will not be crushed or blocked.

[0795] The outer casing 50 includes a first sidewall 50a (e.g., also referred to as the first heat-conducting plate 3331 described above) and a second sidewall 50b (e.g., also referred to as the second heat-conducting plate 3332 described above). The second sidewall 50b is disposed opposite to the first sidewall 50a along a first direction x (which can be the thickness direction of the reinforcing member 30). The partition assembly 61 is connected to the first sidewall 50a and the second sidewall 50b respectively.

[0796] The first sidewall 50a and the second sidewall 50b can be configured as the sidewalls with the largest area of ​​the reinforcing member 30. The reinforcing member 30 can be set at the bottom or side of the housing 10. The first sidewall 50a or the second sidewall 50b is in contact with the battery cell 20 to fully exchange heat with the battery cell 20. The reinforcing member 30 can also be set between two adjacent battery cells 20. The first sidewall 50a and the second sidewall 50b are in contact with the two adjacent battery cells 20 respectively to exchange heat with different battery cells 20 and improve the heat exchange efficiency of the battery.

[0797] In the above scheme, the connection strength between the first sidewall 50a and the second sidewall 50b is strengthened by connecting the separating component 61 (for example, it can also be called the first reinforcing rib mentioned above) to the first sidewall 50a and the second sidewall 50b respectively, thereby improving the overall strength of the reinforcing member 30.

[0798] like Figure 89 and Figure 90 As shown, the partition assembly 61 includes a first bent plate 611 and a second bent plate 612. The first bent plate 611 is connected to the first sidewall 50a; the second bent plate 612 is connected to the second sidewall 50b. The first bent plate 611 and the second bent plate 612 define a deformation cavity 40a.

[0799] The first bending plate 611 is connected to the first sidewall 50a and can define a deformation cavity 40a near the first sidewall 50a. The second bending plate 612 is connected to the second sidewall 50b and can define a deformation cavity 40a near the second sidewall 50b. Alternatively, the deformation cavity 40a is formed between the first bending plate 611 and the second bending plate 612.

[0800] In the above scheme, both the first bending plate 611 and the second bending plate 612 have a bending shape. 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 member 30 and improves the space utilization rate inside the shell 50.

[0801] In some embodiments, the support assembly 62 includes a first support rib 621 and a second support rib 622. The first support rib 621 is connected to the first bending plate 611 and the second sidewall 50b, respectively; the second support rib 622 is connected to the second bending plate 612 and the first sidewall 50a, respectively.

[0802] The first support rib 621 and the second support rib 622 can be located inside the cavity 30a or serve as the sides of the cavity 30a, both of which can support the cavity 30a. The first support rib 621 increases the connection strength between the first bending plate 611 and the outer shell 50, and the second support rib 622 increases the connection strength between the second bending plate 612 and the outer shell 50. Moreover, both the first support rib 621 and the second support rib 622 increase the strength of the cavity 30a. When the reinforcing member 30 is compressed by the expansion force of the battery cell 20, the first support rib 621 and the second support rib 622 can prevent the cavity 30a from deforming, thereby ensuring that the internal volume of the cavity 30a does not change and the heat exchange medium does not overflow. At the same time, at the end of the battery's life cycle, it can prevent the cavity 30a from being crushed and blocked, resulting in thermal performance failure.

[0803] In such Figure 90 and Figure 91 In the embodiment shown, the two ends of the first bent plate 611 are connected to the first sidewall 50a, and the two ends of the second bent plate 612 are connected to the second sidewall 50b; in the first direction X, the first bent plate 611 and the second bent plate 612 are staggered, and a cavity 30a is formed between the first support rib 621 and the second support rib 622.

[0804] The first bending plate 611 is connected to the first sidewall 50a to form a deformation cavity 40a near the first sidewall 50a. The second bending plate 612 is connected to the second sidewall 50b to form a deformation cavity 40a near the second sidewall 50b. The cavity 30a is located between the two deformation cavities 40a. Multiple cavities 30a are arranged adjacently, and the first support rib 621 and the second support rib 622 jointly support the cavity 30a, improving the strength of the cavity 30a. The first sidewall 50a and the second sidewall 50b can respectively contact two adjacent battery cells 20, so that the positions of the first sidewall 50a and the second sidewall 50b corresponding to the deformation cavity 40a can both deform, and the reinforcing member 30 can simultaneously absorb the expansion of two battery cells 20. The first sidewall 50a and the second sidewall 50b are the sidewalls with the largest area of ​​the outer shell 50, respectively contacting the side with the largest area of ​​the battery cell 20, to improve the absorption force of the battery cell 20 expansion.

[0805] In some embodiments, there are multiple first bending plates 611, and a preset distance is spaced between two adjacent first bending plates 611. The first sidewall 50a includes a first gap L1 between two adjacent first bending plates 611. The cavity 30a can contact the battery cell 20 that is attached to the first sidewall 50a through the first gap L1, thereby increasing the contact area of ​​the battery cell 20 that is attached to the first sidewall 50a and increasing the heat exchange efficiency.

[0806] In some embodiments, there are multiple second bending plates 612, and a preset distance is spaced between two adjacent second bending plates 612. The second sidewall 50b includes a second gap L2 between two adjacent second bending plates 612. The cavity 30a can contact the battery cell 20 that is attached to the second sidewall 50b through the second gap L2, thereby increasing the contact area of ​​the battery cell 20 that is attached to the second sidewall 50b and increasing the heat exchange efficiency.

[0807] In other embodiments, there are multiple first bending plates 611, with a preset distance between two adjacent first bending plates 611, and multiple second bending plates 612, with a preset distance between two adjacent second bending plates 612, which can simultaneously improve the heat exchange efficiency of the battery cell 20 that is attached to the first sidewall 50a and the battery cell 20 that is attached to the second sidewall 50b.

[0808] In such Figure 91 In the embodiment shown, the two ends of the first bending plate 611 are connected to the first sidewall 50a to form a cavity 30a near the first sidewall 50a; the two ends of the second bending plate 612 are connected to the second sidewall 50b to form a cavity 30a near the second sidewall 50b.

[0809] The cavities 30a near the first sidewall 50a and 30a near the second sidewall 50b can be arranged opposite each other along the first direction x, that is, there are two cavities 30a in the first direction x. The first bending plate 611 and the second bending plate 612 can form a rhomboid deformable cavity 40a. The cavity 30a near the first sidewall 50a is used to contact the battery cell 20 that is attached to the first sidewall 50a, and the cavity 30a near the second sidewall 50b is used to contact the battery cell 20 that is attached to the second sidewall 50b.

[0810] In the above scheme, the two cavities 30a can contact the two adjacent battery cells 20 respectively, which increases the heat exchange area of ​​the reinforcing member 30.

[0811] In some embodiments, in the first direction x, the first bending plate 611 and the second bending plate 612 are disposed opposite to each other; the bending point of the first bending plate 611 is connected to the bending point of the second bending plate 612.

[0812] The first bending plate 611 and the second bending plate 612 can be triangular, with a relatively large cavity 30a and space. The bending point of the first bending plate 611 is far from the first sidewall 50a, and the bending point of the second bending plate 612 is far from the second sidewall 50b. The two bending points are connected, resulting in a stable structure. In other embodiments, the first bending plate 611 and the second bending plate 612 can also be L-shaped, arc-shaped, or other shapes.

[0813] In the above scheme, the bend of the first bending plate 611 and the bend of the second bending plate 612 are connected, which can strengthen the strength of the partition component 61.

[0814] like Figure 91 As shown, the first bent plate 611 includes a first inclined segment 611a and a second inclined segment 611b connected to each other, and a first support rib 621 is connected to the first inclined segment 611a and the second inclined segment 611b respectively. The bend of the first support rib 621 is connected to the first sidewall 50a, and its two ends are connected to the first inclined segment 611a and the second inclined segment 611b respectively, which improves the connection strength between the first bent plate 611 and the first sidewall 50a and improves the strength of the cavity 30a near the first sidewall 50a. The first support rib 621 can be triangular, resulting in a stable structure. In other embodiments, the first support rib 621 can also be set to an L-shape or an arc shape, or the first support rib 621 can include two separated segments, one segment connected to the first sidewall 50a and the first inclined segment 611a respectively, and the other segment connected to the second sidewall 50b and the second inclined segment 611b respectively.

[0815] In some embodiments, the second bent plate 612 includes a third inclined segment 612a and a fourth inclined segment 613b connected to each other, and a second support rib 622 is connected to the third inclined segment 612a and the fourth inclined segment 613b respectively. The bend of the second support rib 622 is connected to the second sidewall 50b, and its two ends are connected to the third inclined segment 612a and the fourth inclined segment 613b respectively, which improves the connection strength between the second bent plate 612 and the second sidewall 50b and improves the strength of the cavity 30a near the second sidewall 50b.

[0816] The second support rib 622 can be triangular, providing a stable structure. In other embodiments, the second support rib 622 can also be L-shaped or arc-shaped, or the second support rib 622 can include two separate segments, one segment connected to the second sidewall 50b and the third inclined segment 612a respectively, and the other segment connected to the second sidewall 50b and the fourth inclined segment 613b respectively.

[0817] In other embodiments, the first bent plate 611 includes a first inclined segment 15611a and a second inclined segment 611b connected to each other, and a first support rib 621 is connected to the first inclined segment 611a and the second inclined segment 611b respectively. The second bent plate 612 includes a third inclined segment 612a and a fourth inclined segment 613b connected to each other, and a second support rib 622 is connected to the third inclined segment 612a and the fourth inclined segment 613b respectively. This strengthens the connection between the first bent plate 611 and the second bent plate 612, and also improves the strength of the cavity 30a near the first sidewall 50a and the cavity 30a near the second sidewall 50b.

[0818] Figure 92 A side view of the reinforcement 30 provided in some embodiments of this application. Figure 92 In the embodiment shown, the partition assembly 61 includes a first partition plate 613 and a second partition plate 614. The first partition plate 613 extends along the second direction y, and the second partition plate 614 extends along the first direction x. The first direction x and the second direction y are intersected. The second partition plate 614 is connected to the first sidewall 50a and the second sidewall 50b respectively, so as to define a cavity 30a and a deformable cavity 40a separated within the outer shell 50.

[0819] The first direction x and the second direction y can be set perpendicularly, making the cavity 30a and the deformation cavity 40a rectangular. The second partition 614 can support the first sidewall 50a and the second sidewall 50b, improving the structural strength of the reinforcing member 30.

[0820] In some embodiments, the deformable cavity 40a and the air conditioner 40b are alternately arranged in the second direction y. The alternating arrangement of the deformable cavity 40a and the air conditioner 30a can ensure the heat exchange efficiency of the battery cell 20 and uniformly absorb the expansion of the battery cell 20.

[0821] In the first direction x, the deformable cavity 40a and the hollow cavity 30a are arranged adjacent to each other, improving the space utilization rate inside the outer casing 50. This ensures that the hollow cavity 30a and the deformable cavity 40a are evenly and alternately arranged near the first sidewall 50a, allowing for sufficient heat exchange with the battery cell 20 against the first sidewall 50a and absorbing the expansion force of the battery cell 20. Similarly, the evenly and alternately arranged hollow cavities 30a and deformable cavities 40a near the second sidewall 50b ensure sufficient heat exchange with the battery cell 20 against the second sidewall 50b and absorb the expansion force of the battery cell 20.

[0822] In some embodiments, the first sup...

Claims

1. A battery, characterized in that, include: The housing has a receiving cavity; At least two battery cells are housed within a receiving cavity. Each battery cell includes an electrode assembly and an electrode terminal, the electrode assembly being electrically connected to the electrode terminal. Each battery cell includes a first wall, which is the wall with the largest area in the battery cell. Each battery cell also includes a battery case, the electrode assembly being housed within the battery case. The battery case is provided with a pressure relief mechanism, which is integrally formed with the battery case. The battery case includes an integrally formed non-weak area and a weak area. The battery case is provided with a groove, the non-weak area being formed around the groove, and the weak area being formed at the bottom of the groove. The weak area is configured to be destroyed when the internal pressure of the battery cell is released. The pressure relief mechanism includes the weak area, the minimum thickness of the weak area is A1, and the hardness of the weak area is B1, satisfying: 5HBW / mm ≤ B1 / A1 ≤ 10000HBW / mm. A busbar component, wherein the busbar component is connected to the electrode terminals; A reinforcing member is connected to at least two of the battery cells and is thermally connected to the first wall of at least two of the battery cells.

2. The battery according to claim 1, characterized in that, Each of the battery cells also includes a second wall connected to the first wall, the first wall and the second wall being intersected, and the electrode terminals being disposed on the second wall.

3. The battery according to claim 2, characterized in that, Each of the battery cells includes two first walls and two second walls arranged opposite to each other, and the electrode terminals are configured to be at least two; At least two of the electrode terminals are disposed on the same second wall; or, each of the second walls is provided with at least one of the electrode terminals.

4. The battery according to claim 1, characterized in that, The electrode terminals are located on the first wall.

5. The battery according to claim 4, characterized in that, At least two of the battery cells are arranged in a first direction. In the first direction, each battery cell has a first surface that is disposed opposite to the first wall. The first surface has a clearance groove. The clearance groove of one of the two adjacent battery cells is used to accommodate the electrode terminal of the other battery cell. The first direction is perpendicular to the first wall.

6. The battery according to claim 1, characterized in that, The first wall is formed in a cylindrical shape.

7. The battery according to claim 6, characterized in that, The first wall has a second wall at both axial ends, and at least one of the second walls has the electrode terminal.

8. The battery according to claim 7, characterized in that, One of the second walls has an exposed electrode terminal. The electrode assembly includes a positive electrode and a negative electrode. One of the positive electrode and the negative electrode is electrically connected to the electrode terminal, and the other of the positive electrode and the negative electrode is electrically connected to the first wall or the other second wall.

9. The battery according to claim 1, characterized in that, At least one of the battery cells is a pouch cell.

10. The battery according to claim 1, characterized in that, The battery cell also includes a pressure relief mechanism, which is located on the same wall as the electrode terminals.

11. The battery according to claim 1, characterized in that, The battery cell also includes a pressure relief mechanism, which is disposed on two walls of the battery cell, along with the electrode terminals.

12. The battery according to claim 1, characterized in that, The reinforcing member is bonded to the first wall of at least two of the battery cells by a first adhesive layer.

13. The battery according to claim 12, characterized in that, The bottom of the reinforcing member is bonded to the bottom wall of the receiving cavity via a second adhesive layer; and / or, The bottom of the battery cell is bonded to the bottom wall of the receiving cavity by a third adhesive layer.

14. The battery according to claim 13, characterized in that, The thickness of the first adhesive layer is less than or equal to the thickness of the second adhesive layer; and / or, The thickness of the first adhesive layer is less than or equal to the thickness of the third adhesive layer.

15. The battery according to claim 13, characterized in that, The thermal conductivity of the first adhesive layer is greater than or equal to the thermal conductivity of the second adhesive layer; and / or, The thermal conductivity of the first adhesive layer is greater than or equal to that of the third adhesive layer.

16. The battery according to claim 13, characterized in that, The ratio between the thickness of the first adhesive layer and the thermal conductivity of the first adhesive layer is a first ratio; the ratio between the thickness of the second adhesive layer and the thermal conductivity of the second adhesive layer is a second ratio; the ratio between the thickness of the third adhesive layer and the thermal conductivity of the third adhesive layer is a third ratio. Wherein, the first ratio is less than or equal to the second ratio; and / or The first ratio is less than or equal to the third ratio.

17. The battery according to any one of claims 1-16, characterized in that, The reinforcing member is a heat-conducting member, which is used to exchange heat with the battery cell.

18. The battery according to claim 17, characterized in that, The heat-conducting component includes metallic and / or non-metallic materials.

19. The battery according to claim 18, characterized in that, The heat-conducting component includes a metal plate and an insulating layer, wherein the insulating layer is disposed on the surface of the metal plate; or The heat-conducting component is a non-metallic material plate.

20. The battery according to claim 17, characterized in that, The heat-conducting component has a cavity inside.

21. The battery according to claim 20, characterized in that, The cavity is used to contain the heat exchange medium to regulate the temperature of the battery cells.

22. The battery according to any one of claims 1-16, characterized in that, The battery cells are multiple and arranged along the second direction; The reinforcing member includes a partition that extends along the second direction and is connected to the first wall of each of the plurality of battery cells, the second direction being parallel to the first wall.

23. The battery according to claim 22, characterized in that, The reinforcing member also includes an insulating layer for insulating and isolating the first wall of the battery cell and the separator.

24. The battery according to claim 23, characterized in that, The thermal conductivity of the insulating layer is greater than or equal to 0.1 W / (m·K).

25. The battery according to claim 22, characterized in that, The dimension T1 of the partition in the first direction is less than 0.5 mm, and the first direction is perpendicular to the first wall.

26. The battery according to claim 22, characterized in that, The partition has a dimension T1 greater than 5 mm in the first direction, which is perpendicular to the first wall.

27. The battery according to claim 22, characterized in that, The surface of the reinforcing member that connects to the first wall is an insulating surface; The reinforcing member has a dimension of 0.1mm to 100mm in the first direction, which is perpendicular to the first wall.

28. The battery according to claim 22, characterized in that, In the third direction, the size H1 of the partition and the size H2 of the first wall satisfy: 0.1≤H1 / H2≤2, and the third direction is perpendicular to the second direction and parallel to the first wall.

29. The battery according to claim 22, characterized in that, The partition has a cavity inside.

30. The battery according to claim 29, characterized in that, The cavity is used to contain a heat exchange medium to regulate the temperature of the battery cells.

31. The battery according to claim 29, characterized in that, In the first direction, the size of the cavity is W, and the capacity Q of the battery cell and the size W of the cavity satisfy: 1.0Ah / mm≤Q / W≤400Ah / mm, and the first direction is perpendicular to the first wall.

32. The battery according to claim 30, characterized in that, The partition also includes a pair of heat-conducting plates arranged opposite each other along a first direction, and the cavity is disposed between the pair of heat-conducting plates, wherein the first direction is perpendicular to the first wall.

33. The battery according to claim 32, characterized in that, The partition also includes reinforcing ribs, which are disposed between the pair of heat-conducting plates.

34. The battery according to claim 33, characterized in that, The reinforcing rib is connected to at least one of the pair of heat-conducting plates.

35. The battery according to claim 34, characterized in that, The reinforcing rib includes a first reinforcing rib, the two ends of which are respectively connected to the pair of heat-conducting plates, and the first reinforcing rib is inclined relative to the first direction.

36. The battery according to claim 35, characterized in that, The angle between the first reinforcing rib and the first direction is in the range of 30°-60°.

37. The battery according to claim 35, characterized in that, The reinforcing rib also includes a second reinforcing rib, one end of which is connected to one of the pair of heat-conducting plates, and the other end of which is spaced apart from the other of the pair of heat-conducting plates.

38. The battery according to claim 37, characterized in that, The second reinforcing rib extends along the first direction and protrudes from one of the pair of heat-conducting plates.

39. The battery according to claim 37, characterized in that, The first reinforcing rib and the second reinforcing rib are spaced apart.

40. The battery according to claim 32, characterized in that, In the first direction, the thickness D of the heat-conducting plate and the size W of the cavity satisfy: 0.01≤D / W≤25.

41. The battery according to claim 30, characterized in that, The partition has a medium inlet and a medium outlet, the cavity connects the medium inlet and the medium outlet, and the interior of the partition has a cavity that is disconnected from both the medium inlet and the medium outlet.

42. The battery according to claim 29, characterized in that, The cavity is provided with a partition, which is used to divide the cavity into at least two flow channels.

43. The battery according to claim 42, characterized in that, The reinforcing member includes a first heat-conducting plate, a second heat-conducting plate, and a separator stacked together. The separator is disposed between the first heat-conducting plate and the second heat-conducting plate. The first heat-conducting plate and the separator together define a first flow channel, and the second heat-conducting plate and the separator together define a second flow channel.

44. The battery according to any one of claims 1-16, characterized in that, At least a portion of the reinforcement is configured to deform under pressure.

45. The battery according to claim 44, characterized in that, The reinforcing member includes: The heat exchange layer and the compressible layer are stacked together; The elastic modulus of the compressible layer is less than that of the heat exchange layer.

46. ​​The battery according to claim 45, characterized in that, The compressible layer includes a compressible cavity, which is filled with a phase change material or an elastic material.

47. The battery according to claim 44, characterized in that, The reinforcing member includes a housing and a support member, the support member being housed within the housing and defining a spaced cavity and a deformable cavity within the housing, the cavity being for the flow of a heat exchange medium, and the deformable cavity being configured to deform when the housing is under pressure.

48. The battery according to claim 44, characterized in that, The reinforcement includes a housing and an isolation assembly, the isolation assembly being housed within and connected to the housing to form a cavity between the housing and the isolation assembly for the flow of a heat exchange medium, the isolation assembly being configured to deform under pressure.

49. The battery according to any one of claims 1-16, characterized in that, The reinforcing member is provided with a clearance structure, which is used to provide space for the expansion of the battery cell.

50. The battery according to claim 49, characterized in that, The avoidance structure is located at least partially between two adjacent battery cells and serves to provide space for the expansion of at least one of the battery cells.

51. The battery according to claim 49, characterized in that, In a first direction, the reinforcing member includes a first heat-conducting plate and a second heat-conducting plate disposed opposite to each other, with a cavity provided between the first heat-conducting plate and the second heat-conducting plate for accommodating a heat exchange medium. Along the first direction, at least one of the first heat-conducting plate and the second heat-conducting plate is recessed toward the other to form the avoidance structure. The first direction is perpendicular to the first wall.

52. The battery according to any one of claims 1-16, characterized in that, The housing contains battery packs, which are two or more arranged along a first direction. Each battery pack includes two or more battery cells arranged along a second direction, which is perpendicular to the first direction and the first direction is perpendicular to the first wall.

53. The battery according to claim 52, characterized in that, The reinforcing member is sandwiched between two adjacent battery packs.

54. The battery according to claim 53, characterized in that, It also includes a connecting pipe assembly, wherein the reinforcing member has a cavity for accommodating the heat exchange medium, and the connecting pipe assembly is used to connect the cavities of two or more of the reinforcing members.

55. The battery according to claim 54, characterized in that, The connecting pipe assembly includes a connecting channel, an inlet pipe, and an outlet pipe. Along the first direction, the cavities of two adjacent reinforcing members are connected through the connecting channel, and the inlet pipe and the outlet pipe are connected to the cavity of the same reinforcing member.

56. The battery according to any one of claims 1-16, characterized in that, The average grain size of the weak region is S1, and the average grain size of the non-weak region is S2, satisfying: 0.05≤S1 / S2≤0.

9.

57. The battery according to claim 56, characterized in that, The minimum thickness of the weak zone is A1, which satisfies: 1≤A1 / S1≤100.

58. The battery according to any one of claims 1-16, characterized in that, The hardness of the weak area is B1, and the hardness of the non-weak area is B2, satisfying: 1 < B1 / B2 ≤ 5.

59. The battery according to any one of claims 1-16, characterized in that, The minimum thickness of the weak area is A1, and the minimum thickness of the non-weak area is A2, satisfying: 0.05≤A1 / A2≤0.

95.

60. The battery according to any one of claims 1-16, characterized in that, The electrode assembly includes a positive electrode and a negative electrode. The positive electrode and / or the negative electrode includes a current collector and an active material layer. The current collector includes a support layer and a conductive layer. The support layer supports the conductive layer, and the conductive layer supports the active material layer.

61. The battery according to claim 60, characterized in that, Along the thickness direction of the support layer, the conductive layer is disposed on at least one side of the support layer.

62. The battery according to claim 60, characterized in that, The room temperature thin film resistance R of the conductive layer S Satisfies: 0.016Ω / □≤R S ≤420Ω / □.

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

64. The battery according to claim 60, characterized in that, The material of the support layer includes one or more of polymer materials and polymer-based composite materials.

65. The battery according to claim 60, characterized in that, The thickness d1 of the support layer and the light transmittance k of the support layer satisfy the following: When 12μm≤d1≤30μm, 30%≤k≤80%; or, When 8μm≤d1<12μm, 40%≤k≤90%; or, When 1μm≤d1<8μm, 50%≤k≤98%.

66. The battery according to any one of claims 1-16, characterized in that, The electrode assembly includes a positive electrode sheet, which includes a positive current collector and a positive active material layer coated on the surface of the positive current collector. The positive active material layer includes a positive active material having a core and a shell covering the core. The core includes at least one of a ternary material, dLi₂MnO₃·(1-d)LiMO₂, and LiMPO₄, where 0 < d < 1. M includes one or more selected from Fe, Ni, Co, and Mn. The shell contains crystalline inorganic material, the main peak of which has a full width at half maximum (FWHM) of 0-3° as measured by X-ray diffraction, and the crystalline inorganic material includes one or more selected from metal oxides and inorganic salts.

67. The battery according to claim 66, characterized in that, The shell comprises at least one of the metal oxide and the inorganic salt, and carbon.

68. The battery according to any one of claims 1-16, characterized in that, The electrode assembly includes a positive electrode sheet, the positive electrode sheet includes a positive current collector and a positive active material layer coated on the surface of the positive current collector, the positive active material layer includes a positive active material having LiMPO4, the M including Mn, and non-Mn elements, the non-Mn elements satisfying at least one of the following conditions: The ionic radius of the non-Mn element is a, the ionic radius of the manganese element is b, and |ab| / b is not greater than 10%. The valence change voltage of the non-Mn element is U, 2V. <U<5.5V; The chemical activity of the chemical bond formed by the non-Mn element and O is not less than that of the PO bond; The highest oxidation state of the non-Mn element is no greater than 6.

69. The battery according to claim 68, characterized in that, The non-Mn element includes one or both of the first doping element and the second doping element, wherein the first doping element is manganese site doping and the second doping element is phosphorus site doping.

70. The battery according to claim 69, characterized in that, The first dopant element satisfies at least one of the following conditions: The ionic radius of the first doped element is a, the ionic radius of manganese is b, and |ab| / b is not greater than 10%. The valence change voltage of the first dopant element is U, 2V. <U<5.5V。 71. The battery according to claim 69, characterized in that, The second doped element satisfies at least one of the following conditions: The chemical activity of the chemical bond formed by the second dopant element and O is not less than that of the PO bond; The highest oxidation state of the second dopant element is no greater than 6.

72. The battery according to claim 68, characterized in that, The positive electrode active material also has a coating layer.

73. The battery according to claim 72, characterized in that, The coating layer comprises carbon.

74. The battery according to claim 73, characterized in that, The carbon in the coating layer is a mixture of SP2 and SP3 carbon.

75. The battery according to claim 74, characterized in that, The molar ratio of SP2 carbon to SP3 carbon is any value within the range of 0.1-10.

76. An electrical appliance, characterized in that, Includes a battery according to any one of claims 1-75, said battery being used to provide electrical energy.

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