Battery and electrical device

Abstract

A battery and an electrical device. The battery includes a box body, battery cells, and a reinforcing member. The box body has a receiving cavity, and the battery cells are received in the receiving cavity. Each battery cell includes an electrode assembly and an electrode terminal, and the electrode assembly is 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. The reinforcing member is disposed opposite to the first wall and fixedly connected to the first wall, and the reinforcing member is thermally connected to the first wall.

Description

[0001] Cross - reference to related applications

[0002] This application is based on and claims priority to international patent applications with application numbers PCT / CN2022 / 077152, filing date February 21, 2022; PCT / CN2022 / 077153, filing date February 21, 2022; PCT / CN2022 / 077151, filing date February 21, 2022; PCT / CN2022 / 077147, filing date February 21, 2022; PCT / CN2022 / 077149, filing date February 21, 2022; PCT / CN2022 / 077150, filing date February 21, 2022; PCT / CN2022 / 098447, filing date June 13, 2022; PCT / CN2022 / 098727, filing date June 14, 2022; PCT / CN2022 / 099229, filing date June 16, 2022; PCT / CN2022 / 100488, filing date June 22, 2022; PCT / CN2022 / 100486, filing date June 22, 2022; PCT / CN2022 / 111347, filing date August 10, 2022; PCT / CN2022 / 099786, filing date June 20, 2022; PCT / CN2022 / 101392, filing date June 27, 2022; PCT / CN2022 / 101395, filing date June 27, 2022. The entire contents of the above - mentioned 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 art

[0004] With the increasing environmental pollution, the new energy industry has attracted more and more attention. In the new energy industry, battery technology is an important factor related to its development.

[0005] Battery energy density is a key parameter in battery performance. However, improving battery energy density also requires consideration of other battery performance parameters. Therefore, improving battery performance is a pressing technical issue in battery technology. Summary of the Invention

[0006] The present application aims to solve at least one of the technical problems existing in the related art. To this end, the present application proposes a battery that increases energy density while ensuring heat conduction in the battery, thereby improving battery performance.

[0007] The present application also provides an electrical device having the battery.

[0008] According to the battery of the embodiment of the first aspect of the present application, it includes: a box body, the box body has a accommodating cavity; a battery cell, the battery cell is accommodated in the accommodating cavity, the battery cell includes an electrode assembly and an electrode terminal, the electrode assembly is electrically connected to the electrode terminal, the battery cell includes a first wall, the first wall is the wall with the largest area in the battery cell; a reinforcement, the reinforcement is arranged opposite to the first wall, the reinforcement is fixedly connected to the first wall, and the reinforcement is thermally conductively connected to the first wall.

[0009] According to the battery of the embodiment of the present application, there is no need to set up structures such as beams in the middle of the box, which can greatly improve the space utilization inside the battery, thereby improving the energy density of the battery; at the same time, the use of the above-mentioned reinforcement can also ensure heat conduction in the battery.

[0010] In some embodiments, the battery cell further includes a second wall connected to the first wall, the first wall and the second wall are arranged to intersect, and the electrode terminal is arranged on the second wall.

[0011] In some embodiments, the battery cell includes two first walls and two second walls arranged opposite to each other, and the electrode terminals are provided in at least two forms; at least two electrode terminals are provided on the same second wall; or each second wall is provided with at least one electrode terminal.

[0012] In some embodiments, the electrode terminal is provided on the first wall.

[0013] In some embodiments, there are multiple battery cells and they are arranged in a first direction. In the first direction, each battery cell is provided with a first surface opposite to the first wall, and the first surface is provided with an avoidance groove. The avoidance groove of one of the two adjacent battery cells is used to accommodate the electrode terminal of the other battery cell, and the first direction is perpendicular to the first wall.

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

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

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

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

[0018] In some embodiments, the battery cell further includes a pressure relief mechanism, and the pressure relief mechanism and the electrode terminal are disposed on the same wall of the battery cell.

[0019] In some embodiments, the battery cell further includes a pressure relief mechanism, and the pressure relief mechanism and the electrode terminal are respectively disposed on two walls of the battery cell.

[0020] In some embodiments, the reinforcing member is bonded to the first wall through a first adhesive layer.

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

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

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

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

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

[0028] In some embodiments, a cavity is formed in the heat conducting member.

[0029] In some embodiments, the cavity is configured to accommodate a heat exchange medium for regulating the temperature of the battery cell.

[0030] In some embodiments, there are a plurality of battery cells arranged along a second direction; the reinforcing member includes a partition, the partition extends along the second direction and is connected to the first wall of each of the plurality of battery cells, and the second direction is parallel to the first wall.

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

[0032] In some embodiments, the heat conductivity coefficient 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 perpendicular to the first wall is less than 0.5 mm.

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

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

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

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

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

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

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

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

[0043] In some embodiments, the reinforcing ribs include a first reinforcing rib, and both ends of the first reinforcing rib are respectively connected to the pair of heat-conducting plates, and the first reinforcing rib is inclined with respect to the first direction.

[0044] In some embodiments, the included angle between the first reinforcing rib and the first direction ranges from 30° to 60°.

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

[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 from each other.

[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 separator is provided with a medium inlet and a medium outlet, the cavity communicates with the medium inlet and the medium outlet, and a cavity that is disconnected from both the medium inlet and the medium outlet is provided inside the separator.

[0050] In some embodiments, a partition member is disposed in the cavity, and the partition member 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 partition member that are stacked, the partition member is disposed between the first heat-conducting plate and the second heat-conducting plate, the first heat-conducting plate and the partition member jointly define a first flow channel, and the second heat-conducting plate and the partition member jointly define a second flow channel.

[0052] In some embodiments, at least a part of the reinforcing member is configured to be deformable when pressed.

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

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

[0055] In some embodiments, the reinforcing member includes a housing and a support member, the support member is accommodated in the housing and is used to define a cavity and a deformation cavity that are separately arranged in the housing, the cavity is used for the heat exchange medium to flow through, and the deformation cavity is configured to be deformable when the housing is pressed.

[0056] In some embodiments, the reinforcing member includes a housing and an isolation assembly, the isolation assembly is accommodated in the housing and is connected to the housing to form a cavity between the housing and the isolation assembly, the cavity is used for the heat exchange medium to flow through, and the isolation assembly is configured to be deformable when the housing is pressed.

[0057] In some embodiments, the reinforcing member is provided with an avoidance structure, and the avoidance structure is used to provide space for the expansion of the battery cell.

[0058] In some embodiments, a plurality of battery cells are provided, at least a part of the avoidance structure is located between two adjacent battery cells, and is used to provide space for the expansion of at least one battery cell.

[0059] In some embodiments, in a first direction, the reinforcing member includes a first heat-conducting plate and a second heat-conducting plate that are oppositely arranged, a cavity is provided between the first heat-conducting plate and the second heat-conducting plate, the cavity is used to accommodate a heat exchange medium, along the first direction, at least one of the first heat-conducting plate and the second heat-conducting plate is recessed towards the direction close to the other to form the avoidance structure, and the first direction is perpendicular to the first wall.

[0060] In some embodiments, a battery pack is provided inside the box body. The number of the battery packs is two or more and they are arranged along a first direction. Each battery pack includes 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, a reinforcing member is clamped between adjacent two groups of the battery packs.

[0062] In some embodiments, the battery further includes a connecting pipe group. A cavity for accommodating a heat exchange medium is provided inside the reinforcing member, and the connecting pipe group is used to communicate the cavities of two or more of the reinforcing members.

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

[0064] In some embodiments, the battery cell further includes a battery box. The electrode assembly is accommodated inside the battery box, and the battery box is provided with a pressure relief mechanism, and the pressure relief mechanism is integrally formed with the battery box.

[0065] In some embodiments, the battery box includes an integrally formed non-weak area and a weak area. The battery box is provided with a groove portion. The non-weak area is formed around the groove portion, and the weak area is formed at the bottom of the groove portion. The weak area is configured to be damaged when the battery cell discharges internal pressure, and the pressure relief mechanism includes the weak area.

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

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

[0068] In some embodiments, the minimum thickness of the weak area is A1, and the hardness of the weak area is B1, satisfying: 5 HBW / mm ≤ B1 / A ≤ 10000 HBW / 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 sheet and a negative electrode sheet. The positive electrode sheet and / or the negative electrode sheet includes a current collector and an active material layer. The current collector includes a support layer and a conductive layer. The support layer is used to carry the conductive layer, and the conductive layer is used to carry the active material layer.

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

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

[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 polymer 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: when 12 μm ≤ d1 ≤ 30 μm, 30% ≤ k ≤ 80%; or when 8 μm ≤ d1 < 12 μm, 40% ≤ k ≤ 90%; or when 1 μm ≤ d1 < 8 μm, 50% ≤ k ≤ 98%.

[0077] In some embodiments, the electrode assembly includes a positive electrode sheet. The positive electrode sheet includes a positive electrode current collector and a positive electrode active material layer coated on the surface of the positive electrode current collector. The positive electrode active material layer includes a positive electrode active material. The positive electrode active material has a core and a shell coating the core. The core includes at least one of ternary materials, dLi2MnO3·(1 - d)LiMO2, and LiMPO4, 0 < d < 1. M includes one or more selected from Fe, Ni, Co, and Mn. The shell contains crystalline inorganic substances. The full width at half maximum of the main peak measured by X-ray diffraction of the crystalline inorganic substances is 0 - 3°. The crystalline inorganic substances include 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 variable valence voltage of the non-Mn element is U, and 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 variable valence voltage of the first doping element is U, and 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 embodiment of the first aspect of the present application, and the battery is used to provide electrical energy.

[0088] Additional aspects and advantages of the present application will be given in part in the following description, will become apparent in part from the following description, or will be understood through the practice of the present application. Description of the Drawings

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

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

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

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

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

[0094] Figure 5 is Figure 4 a schematic diagram of the battery cell shown in;

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

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

[0097] Figure 8 is Figure 7 a schematic diagram of the arrangement of the battery cells shown in;

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

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

[0100] Figure 11 is Figure 10 a schematic diagram of the heat conducting member shown in;

[0101] Figure 12 is Figure 10 a schematic diagram of the heat conducting member and a plurality of battery cells shown in;

[0102] Figure 13 is Figure 10 another schematic diagram of the battery shown in;

[0103] Figure 14 is a partial structural schematic diagram of a battery according to an embodiment of the present application;

[0104] Figure 15 is Figure 14 another schematic diagram of the battery shown in;

[0105] Figure 16 is Figure 14 a schematic layout diagram of the battery cells shown in

[0106] Figure 17 a partial structure schematic diagram of a battery according to an embodiment of the present application;

[0107] Figure 18 is Figure 17 another schematic diagram of the battery shown in

[0108] Figure 19 is Figure 17 yet another schematic diagram of the battery shown in

[0109] Figure 20 a schematic diagram of a partial structure of a battery according to an embodiment of the present application;

[0110] Figure 21 is Figure 20 a schematic diagram of the thermal management component shown in

[0111] Figure 22 is Figure 21 a cross-sectional view of the thermal management component shown in

[0112] Figure 23 is Figure 22 an enlarged view of part A circled in

[0113] Figure 24 a cross-sectional view of a reinforcing member with a partition inside according to an embodiment of the present application;

[0114] Figure 25 is Figure 22 an enlarged view of part B circled in

[0115] Figure 26 is Figure 22 an enlarged view of part C circled in

[0116] Figure 27 a cross-sectional view of a reinforcing member according to an embodiment of the present application;

[0117] Figure 28 is Figure 27 an enlarged view of part D circled in

[0118] Figure 29 is Figure 27 an enlarged view of part E circled in

[0119] Figure 30 a partial structure schematic diagram of a battery according to an embodiment of the present application;

[0120] Figure 31 isFigure 30 Partial cross-sectional view of the battery shown in;

[0121] Figure 32 is Figure 31 Enlarged view of part F circled in;

[0122] Figure 33 Schematic diagrams of various structures of the separator according to some embodiments of the present application;

[0123] Figure 34 Exploded view of the battery according to an embodiment of the present application;

[0124] Figure 35 Schematic diagram of the battery according to an embodiment of the present application

[0125] Figure 36 is Figure 35 Schematic diagram of the connection between the battery cell and the thermal management component shown in;

[0126] Figure 37 is Figure 36 Cross-sectional view along the A-A direction in;

[0127] Figure 38 is Figure 37 Enlarged view of part G circled in;

[0128] Figure 39 Schematic diagram of the battery according to an embodiment of the present application;

[0129] Figure 40 Exploded view of the battery according to an embodiment of the present application;

[0130] Figure 41 Exploded view of the battery according to an embodiment of the present application;

[0131] Figure 42 Schematic diagram of the battery according to an embodiment of the present application;

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

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

[0134] Figure 45 is Figure 44 Cross-sectional view along the B-B direction in;

[0135] Figure 46 Schematic diagram of the battery according to an embodiment of the present application;

[0136] Figure 47 isFigure 46 Schematic diagram of the reinforcement member shown;

[0137] Figure 48 is Figure 47 Cross-sectional view of the main body plate shown in;

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

[0139] Figure 50 Cross-sectional view of the main body plate according to an embodiment of the present application;

[0140] Figure 51 Cross-sectional view of the main body plate according to an embodiment of the present application;

[0141] Figure 52 Schematic diagram of the reinforcement member according to an embodiment of the present application;

[0142] Figure 53 Cross-sectional view of the reinforcement member according to an embodiment of the present application;

[0143] Figure 54 is Figure 53 Another cross-sectional view of the reinforcement member in;

[0144] Figure 55 Cross-sectional view of the partition member according to an embodiment of the present application;

[0145] Figure 56 Cross-sectional view of the reinforcement member according to an embodiment of the present application;

[0146] Figure 57 Cross-sectional view of the partition member according to an embodiment of the present application;

[0147] Figure 58 Cross-sectional view of the reinforcement member according to an embodiment of the present application;

[0148] Figure 59 Schematic diagram of the partition member according to an embodiment of the present application;

[0149] Figure 60 Cross-sectional view of the reinforcement member according to an embodiment of the present application;

[0150] Figure 61 Cross-sectional view of the battery according to an embodiment of the present application;

[0151] Figure 62 Cross-sectional view of the battery according to an embodiment of the present application;

[0152] Figure 63 Cross-sectional view of the battery according to an embodiment of the present application;

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

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

[0155] Figure 66 is a cross-sectional view of a reinforcing member according to an embodiment of the present application;

[0156] Figure 67 is a cross-sectional view of a reinforcing member according to an embodiment of the present application;

[0157] Figure 68 is a cross-sectional view of a reinforcing member according to an embodiment of the present application;

[0158] Figure 69 is a cross-sectional view of a reinforcing member according to an embodiment of the present application;

[0159] Figure 70 is a cross-sectional view of a reinforcing member according to an embodiment of the present application;

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

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

[0162] Figure 73 is Figure 72 another schematic diagram of the reinforcing member shown in;

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

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

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

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

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

[0168] Figure 79 is an exploded view of a reinforcing member according to an embodiment of the present application;

[0169] Figure 80 is Figure 79Schematic diagram of the current collector element shown therein;

[0170] Figure 81 Schematic diagram of a battery according to an embodiment of the present application;

[0171] Figure 82 Schematic diagram of a reinforcing member according to an embodiment of the present application;

[0172] Figure 83 Schematic diagram of a reinforcing member according to an embodiment of the present application;

[0173] Figure 84 Is Figure 83 Enlarged view of portion H circled in;

[0174] Figure 85 Schematic diagram of a battery according to an embodiment of the present application;

[0175] Figure 86 Schematic diagram of a reinforcing member according to an embodiment of the present application;

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

[0177] Figure 88 Schematic diagram of a reinforcing member according to an embodiment of the present application;

[0178] Figure 89 Is Figure 87 Enlarged view of portion I circled in;

[0179] Figure 90 Is Figure 88 Enlarged view of portion J circled in;

[0180] Figure 91 Is Figure 90 Another schematic diagram of the reinforcing member in;

[0181] Figure 92 Schematic diagram of a reinforcing member according to an embodiment of the present application;

[0182] Figure 93 Schematic diagram of a reinforcing member according to an embodiment of the present application;

[0183] Figure 94 Is Figure 93 Enlarged view of portion K circled in;

[0184] Figure 95 Schematic diagram of a reinforcing member according to an embodiment of the present application;

[0185] Figure 96 Is Figure 95 Enlarged view of portion L circled in;

[0186] Figure 97 Partial schematic view of a reinforcement member according to an embodiment of the present application;

[0187] Figure 98 Partial schematic view of a reinforcement member according to an embodiment of the present application;

[0188] Figure 99 Schematic view of a reinforcement member according to an embodiment of the present application;

[0189] Figure 100 Schematic view of a battery according to an embodiment of the present application;

[0190] Figure 101 is Figure 100 Exploded view of the battery shown in;

[0191] Figure 102 Schematic view of a battery according to an embodiment of the present application;

[0192] Figure 103 Schematic view of a reinforcement member according to an embodiment of the present application;

[0193] Figure 104 Schematic view of a reinforcement member according to an embodiment of the present application;

[0194] Figure 105 Schematic view of a reinforcement member according to an embodiment of the present application;

[0195] Figure 106 Schematic view of a reinforcement member according to an embodiment of the present application;

[0196] Figure 107 Schematic view of a battery according to an embodiment of the present application;

[0197] Figure 108 Schematic view of a battery according to an embodiment of the present application;

[0198] Figure 109 Schematic view of a battery according to an embodiment of the present application;

[0199] Figure 110 Schematic view of a battery cell according to an embodiment of the present application;

[0200] Figure 111 Schematic view of a battery according to an embodiment of the present application;

[0201] Figure 112 Schematic view of a battery according to an embodiment of the present application;

[0202] Figure 113 is Figure 112Schematic diagram of the reinforcement shown;

[0203] Figure 114 Schematic diagram of the reinforcement according to an embodiment of the present application;

[0204] Figure 115 Is Figure 114 Another schematic diagram of the reinforcement in;

[0205] Figure 116 Schematic diagram of the structure of the housing provided for some embodiments of the present application;

[0206] Figure 117 Is Figure 116 C-C cross-sectional view of the housing shown;

[0207] Figure 118 Is [[ID= Grain diagram (schematic diagram) of the housing shown;

[0208] ​ Is ​ Partial enlarged view of the housing at E shown;

[0209] ​ Partial enlarged view of the housing provided for some other embodiments of the present application;

[0210] ​ Schematic diagram of the structure of the housing provided for some other embodiments of the present application (showing the first-level notch groove);

[0211] ​ Is ​ E-E cross-sectional view of the housing shown;

[0212] ​ Schematic diagram of the structure of the housing provided for some other embodiments of the present application (showing the first-level notch groove);

[0213] ​ Is ​ F-F cross-sectional view of the housing shown;

[0214] ​ Schematic diagram of the structure of the housing provided for some other embodiments of the present application (showing the first-level notch groove);

[0215] ​ Is ​ G-G cross-sectional view of the housing shown;

[0216] ​ Schematic diagram of the structure of the housing provided for some other embodiments of the present application (showing the two-level notch groove);

[0217] ​ Is ​K-K cross-sectional view of the shown housing;

[0218] ​ Schematic structural diagram of the housing provided for some other embodiments of the present application (showing two-stage scoring grooves);

[0219] ​ For ​ M-M cross-sectional view of the shown housing;

[0220] ​ Schematic structural diagram of the housing provided for some other embodiments of the present application (showing two-stage scoring grooves);

[0221] ​ For ​ N-N cross-sectional view of the shown housing;

[0222] ​ Axonometric view of the housing provided for some embodiments of the present application;

[0223] ​ For ​ Schematic structural diagram of the shown housing (showing one-stage scoring groove and one-stage sinking groove);

[0224] ​ For ​ O-O cross-sectional view of the shown housing;

[0225] ​ Schematic structural diagram of the housing provided for some other embodiments of the present application (showing one-stage scoring groove and one-stage sinking groove);

[0226] ​ For ​ P-P cross-sectional view of the shown housing;

[0227] ​ Schematic structural diagram of the housing provided for some other embodiments of the present application (showing one-stage scoring groove and one-stage sinking groove);

[0228] ​ For ​ Q-Q cross-sectional view of the shown housing component;

[0229] ​ Schematic structural diagram of the housing provided for some embodiments of the present application (showing one-stage scoring groove and two-stage sinking grooves);

[0230] ​ For ​ R-R cross-sectional view of the shown housing component;

[0231] ​ Schematic structural diagram of the housing provided for some other embodiments of the present application (showing one-stage scoring groove and two-stage sinking grooves);

[0232] ​ The ​ S-S cross-sectional view of the housing shown;

[0233] ​ Schematic diagram of the housing component provided by other embodiments of the present application (showing the first-level scoring grooves and the two-level sinking grooves);

[0234] ​ The ​ T-T cross-sectional view of the housing shown;

[0235] ​ Schematic diagram of the housing provided by other embodiments of the present application;

[0236] ​ Grain diagram (schematic diagram) of the housing provided by other embodiments of the present application;

[0237] ​ Schematic diagram of the end cap provided by some embodiments of the present application;

[0238] ​ Schematic diagram of the housing provided by some embodiments of the present application;

[0239] ​ Schematic diagram of the housing provided by other embodiments of the present application;

[0240] ​ Schematic diagram of the battery cell provided by some embodiments of the present application;

[0241] ​ Schematic diagram of the positive current collector of a specific embodiment of the present application;

[0242] ​ Schematic diagram of the positive current collector of another specific embodiment of the present application;

[0243] ​ Schematic diagram of the negative current collector of a specific embodiment of the present application;

[0244] ​ Schematic diagram of the negative current collector of another specific embodiment of the present application;

[0245] ​ Schematic diagram of the positive electrode sheet of a specific embodiment of the present application;

[0246] ​ Schematic diagram of the positive electrode sheet of another specific embodiment of the present application;

[0247] ​Schematic diagram of the negative electrode sheet of a specific embodiment of the present application;

[0248] ​ Schematic diagram of the negative electrode sheet of another specific embodiment of the present application;

[0249] ​ Schematic diagram of the first nail penetration experiment of the present application;

[0250] ​ Temperature change curves of lithium-ion battery No. 1 and lithium-ion battery No. 4 after the first nail penetration experiment;

[0251] ​ Voltage change curves of lithium-ion battery No. 1 and lithium-ion battery No. 4 after the first nail penetration experiment;

[0252] ​ X-ray diffraction pattern (XRD) diagrams of undoped LiMnPO4 and the positive electrode active material prepared in Example 2.

[0253] ​ X-ray energy dispersive spectrum (EDS) diagram of the positive electrode active material prepared in Example 2.

[0254] ​ Schematic diagram of the positive electrode active material with a core-shell structure described in the present application.

[0255] ​ Schematic diagram of the positive electrode active material with a core-shell structure in an embodiment of the present application. Specific embodiments

[0256] The embodiments of the present application will be further described in detail below in conjunction with the accompanying drawings and examples. The following detailed description of the examples and the accompanying drawings are used to exemplarily illustrate the principle of the present application, but cannot be used to limit the scope of the present application, that is, the present application is not limited to the described embodiments.

[0257] In the description of the present application, it should be noted that unless otherwise specified, all technical and scientific terms used have the same meaning as commonly understood by those skilled in the technical field to which the present application belongs; the terms used are only for the purpose of describing specific embodiments and are not intended to limit the present application; the terms "including" and "having" and any variations thereof in the description, claims and drawings of the present application are intended to cover non-exclusive inclusion; the meaning of "a plurality" is more than two; the orientation or positional relationships indicated by the terms "upper", "lower", "left", "right", "inner", "outer", etc. are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation on the present application. In addition, the terms "first", "second", "third", etc. are only used for descriptive purposes and cannot 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.

[0258] The mention of "embodiment" in the present application means that the specific features, structures or characteristics described in connection with the embodiment can be included in at least one embodiment of the present application. The phrase appearing at various positions in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. Those skilled in the art will explicitly and implicitly understand that the embodiments described in the present application can be combined with other embodiments.

[0259] The directional terms appearing in the following description are all the directions shown in the figures and do not limit the specific structure of the present application. In the description of the present application, it should also be noted that unless otherwise clearly specified and limited, the terms "mounted", "connected" and "coupled" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection or an integral connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the internal communication of two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0260] The term "and / or" in the present application is merely a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. Without special explanation, in the present 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) while B is true (or exists); or both A and B are true (or exist).

[0261] Unless otherwise specified, the terms "comprising" and "including" used in this application are open-ended and may also be closed-ended. For example, the terms "comprising" and "including" may mean that other components not listed may also be included or comprised, or that only the listed components are included or comprised.

[0262] The "ranges" disclosed in this application are defined in terms of a lower limit and an upper limit. A given range is defined by selecting a lower limit and an upper limit, and the selected lower limit and upper limit define the boundaries of a particular range. The ranges defined in this way may or may not include the end values, and may be combined arbitrarily, i.e., any lower limit may be combined with any upper limit to form a range. Any lower limit may be combined with any upper limit to form a range not explicitly recited; and any lower limit may be combined with other lower limits to form a range not explicitly recited, and similarly any upper limit may be combined with any other upper limit to form a range not explicitly recited. In addition, although not explicitly recited, each point or single value between the range endpoints is included within the range. Thus, each point or single value may serve as its own lower or upper limit and be combined with any other point or single value or with other lower or upper limits to form a range not explicitly recited.

[0263] For example, if ranges of 60 - 120 and 80 - 110 are listed for a particular parameter, ranges of 60 - 110 and 80 - 120 are understood to be contemplated as well. In addition, if the minimum range values of 1 and 2 are listed, and if the maximum range values of 3, 4, and 5 are listed, then the following ranges are all contemplated: 1 - 3, 1 - 4, 1 - 5, 2 - 3, 2 - 4, and 2 - 5. In this application, unless otherwise stated, the numerical range "a - b" represents an abbreviated representation of any combination of real numbers between a and b, where a and b are both real numbers. For example, the numerical range "0 - 5" represents that all real numbers between "0 - 5" are fully listed herein, and "0 - 5" is merely an abbreviated representation of these numerical combinations. Additionally, when a parameter is expressed as an integer ≥2, it is equivalent to disclosing that the parameter is, for example, the integers 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, etc. In this application, "about" a certain numerical value represents a range, meaning a range of that numerical value ±10%.

[0264] Unless otherwise specified, all embodiments and optional embodiments of the present application can be combined with each other to form new technical solutions. Unless otherwise specified, all technical features and optional technical features of the present application can be combined with each other to form new technical solutions. Unless otherwise specified, all steps of the present application can be carried out in sequence or randomly, preferably in sequence. For example, the method includes steps (a) and (b), indicating that the method may include steps (a) and (b) carried out in sequence, or may also include steps (b) and (a) carried out in sequence. For example, it is mentioned that the method may further include step (c), indicating that step (c) can be added to the method in any order. For example, the method may include steps (a), (b) and (c), or may also include steps (a), (c) and (b), or may also include steps (c), (a) and (b), etc.

[0265] It should be noted that in this text, the terms "coating layer" and "coating" refer to the layer of material coated on the core material such as lithium manganese phosphate. The layer of material can completely or partially coat the core. The use of "coating layer" is only for convenience of description and is not intended to limit the present application. Additionally, each coating layer can be a complete coating or a partial coating. Similarly, the term "thickness of the coating layer" refers to the thickness of the layer of material coated on the core in the radial direction of the core.

[0266] In the present application, the battery cell can include a lithium-ion secondary battery, a lithium-ion primary battery, a lithium-sulfur battery, a sodium-lithium-ion battery, a sodium-ion battery, a magnesium-ion battery, etc., and the embodiments of the present application are not limited thereto. The battery cell can be in a cylindrical shape, a flat shape, a cuboid shape or other shapes, and the embodiments of the present application are also not limited thereto. Generally, the battery cell is divided into three types according to the encapsulation method: a cylindrical battery cell, a square battery cell and a soft-pack battery cell, and the embodiments of the present application are also not limited thereto.

[0267] The battery mentioned in the embodiments of the present application refers to a single physical module including one or more battery cells to provide a higher voltage and capacity. For example, the battery mentioned in the present application can include a battery pack, etc. The battery generally includes a box body for encapsulating one or more battery cells. The box body can prevent liquids or other foreign objects from affecting the charging or discharging of the battery cells.

[0268] The box body 10 can include a first part 101 and a second part 102 (such as ​ and 3As shown, the first part 101 and the second part 102 are covered with each other, and the first part 101 and the second part 102 jointly define an accommodation space for accommodating the battery cell 20. The second part 102 can be a hollow structure with an open end, and the first part 101 is a plate-like structure. The first part 101a covers the open side of the second part 102 to form a box body with an accommodation space; both the first part 101 and the second part 102 can also be hollow structures with an open side, and the open side of the first part 101a covers the open side of the second part 102 to form a box body with an accommodation space. Of course, the first part 101a and the second part 102 can be of various shapes, such as a cylinder, a cuboid, etc.

[0269] To improve the sealing performance after the connection between the first part 101 and the second part 102, a sealing member can also be provided between the first part 101 and the second part 102, such as sealant, sealing ring, etc.

[0270] The battery cell includes an electrode assembly and an electrolyte. The electrode assembly is composed of a positive electrode sheet, a negative electrode sheet and a separator. The battery cell mainly works by the movement of metal ions between the positive electrode sheet and the negative electrode sheet. The positive electrode sheet includes a positive electrode current collector and a positive electrode active material layer. The positive electrode active material layer is coated on the surface of the positive electrode current collector, and the current collector without the coated positive electrode active material layer protrudes from the current collector with the coated positive electrode active material layer. The current collector without the coated positive electrode active material layer serves as the positive electrode tab. Taking a lithium-ion battery as an example, the material of the positive electrode current collector can be aluminum, and the positive electrode active material can be lithium cobaltate, lithium iron phosphate, ternary lithium or lithium manganate, etc. The negative electrode sheet includes a negative electrode current collector and a negative electrode active material layer. The negative electrode active material layer is coated on the surface of the negative electrode current collector, and the current collector without the coated negative electrode active material layer protrudes from the current collector with the coated negative electrode active material layer. The current collector without the coated negative electrode active material layer serves as the negative electrode tab. The material of the negative electrode current collector can be copper, and the negative electrode active material can be carbon or silicon, etc. To ensure that a large current can pass through without fusing, the number of positive electrode tabs is multiple and stacked together, and the number of negative electrode tabs is multiple and stacked together.

[0271] There is no special limitation on the above-mentioned separator. Any well-known porous structure separator with electrochemical stability and chemical stability can be selected. For example, it can be 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 can be polypropylene (PP) or polyethylene (PE), etc. In addition, the electrode assembly can be a wound structure or a stacked structure, and the embodiments of the present application are not limited thereto.

[0272] The above electrolyte includes an organic solvent and an electrolyte salt, where the electrolyte salt plays a role in transporting ions between the positive and negative electrodes, and the organic solvent serves as a medium for transporting ions. The electrolyte salt can be an electrolyte salt known in the art for the electrolyte of a battery cell, such as one or more of 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 difluoro(oxalato)borate), LiBOB (lithium bis(oxalato)borate), LiPO2F2 (lithium difluorophosphate), LiDFOP (lithium difluoro(dioxalato)phosphate), and LiTFOP (lithium tetrafluoro(oxalato)phosphate); the organic solvent can be an organic solvent known in the art for the electrolyte of a battery cell, such as one or more of ethylene carbonate (EC), propylene carbonate (PC), ethyl methyl carbonate (EMC), diethyl carbonate (DEC), dimethyl carbonate (DMC), dipropyl carbonate (DPC), methyl propyl carbonate (MPC), ethyl propyl carbonate (EPC), butylene carbonate (BC), fluoroethylene carbonate (FEC), methyl formate (MF), methyl acetate (MA), ethyl acetate (EA), propyl acetate (PA), methyl propionate (MP), ethyl propionate (EP), propyl propionate (PP), methyl butyrate (MB), ethyl butyrate (EB), 1,4-butyrolactone (GBL), sulfolane (SF), dimethyl sulfone (MSM), ethyl methyl sulfone (EMS), and diethyl sulfone (ESE), preferably two or more, and appropriate electrolyte salts and organic solvents can be selected according to actual needs.

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

[0274] To meet different power demands, a battery can include multiple battery cells, where the multiple battery cells can be connected in series, parallel, or a combination of series and parallel (mixed connection). A mixed connection means a combination of series and parallel. Optionally, the multiple battery cells can first be connected in series, parallel, or in a mixed connection to form a battery module, and then multiple battery modules can be connected in series, parallel, or in a mixed connection to form a battery. That is to say, the multiple battery cells can directly form a battery, or can first form a battery module or a battery pack, and then the battery module forms a battery. The battery is further arranged in an electrical device to provide electrical energy for the electrical device.

[0275] The development of battery technology needs to consider various design factors simultaneously. For example, energy density, cycle life, discharge capacity, charge-discharge rate, safety, etc. Among them, when the internal space of the battery is fixed, improving the utilization rate of the internal space of the battery is an effective means to increase the energy density of the battery. However, when improving the utilization rate of the internal space of the battery, other parameters of the battery also need to be considered, such as heat conduction or thermal management. Moreover, when improving the utilization rate of the internal space of the battery, it may reduce the structural strength of the battery. For example, beams for mounting battery modules are usually provided inside the battery box. In addition, side plates and end plates are also provided for the battery modules in the battery. While the above-mentioned beams, side plates and end plates realize the fixation of the battery, they also occupy the internal space of the battery. However, if the beams, side plates and end plates are not provided, the structural strength of the battery will be insufficient, affecting the performance of the battery.

[0276] During the charge and discharge process of the battery, a large amount of heat is generated. Especially during fast charging, a large amount of heat is generated by the battery cells. These heats accumulate and stack up, causing the battery temperature to rise sharply. When the heat of the battery cells cannot be dissipated in time, it may lead to thermal runaway of the battery, resulting in safety accidents such as smoking, fire and explosion. At the same time, long-term and severe temperature non-uniformity will greatly reduce the service life of the battery. In addition, when the temperature is very low, the discharge efficiency of the battery is very low, and it is even difficult to start at low temperatures, affecting the normal use of the battery. Therefore, how to ensure the thermal management requirements of the battery is crucial.

[0277] In view of this, the embodiments of the present application provide a technical solution. In the embodiments of the present application, battery cells are arranged in the accommodation cavity of the box body of the battery, and a reinforcing member is fixedly connected to the first wall with the largest area of the battery cell and is thermally conductive to the first wall, so that the reinforcing member is used to conduct the heat of the battery cell. In this way, structures such as beams do not need to be provided in the middle of the battery box body, and side plates do not need to be provided inside the battery, which can greatly improve the utilization rate of the internal space of the battery, thereby increasing the energy density of the battery; at the same time, the above-mentioned reinforcing member can also ensure the heat conduction in the battery. Therefore, the technical solution of the embodiments of the present application can ensure the heat conduction in the battery while increasing the energy density of the battery, thereby improving the performance of the battery.

[0278] The technical solutions described in the embodiments of the present application are applicable to various devices using batteries, such as mobile phones, portable devices, laptop computers, battery cars, electric toys, electric tools, electric vehicles, ships and spacecrafts, etc. For example, spacecrafts include airplanes, rockets, space shuttles and spaceships, etc.

[0279] It should be understood that the technical solutions described in the embodiments of the present application are not only limited to the above-described devices, but also applicable to all devices using batteries. However, for the sake of simplicity of description, the following embodiments will be described by taking electric vehicles as examples.

[0280] For example, as ​ shown, it is a schematic structural diagram of a vehicle 1000 according to an embodiment of the present application. The vehicle 1000 can be a fuel vehicle, a gas vehicle, or a new energy vehicle. The new energy vehicle can be a pure electric vehicle, a hybrid vehicle, or an extended-range vehicle, etc. A motor 101, a controller 102, and a battery 100 can be arranged inside the vehicle 1000. The controller 102 is used to control the power supply of the battery 100 to the motor 101. For example, the battery 100 can be arranged at the bottom, the front end, or the rear end of the vehicle 1000. The battery 100 can be used for the power supply of the vehicle 1000. For example, the battery 100 can be used as the operating power supply of the vehicle 1000 and used for the circuit system of the vehicle 1000, such as the working power consumption requirements for starting, navigating, and running of the vehicle 1000. In another embodiment of the present application, the battery 100 can not only be used as the operating power supply of the vehicle 1000, but also be used as the driving power supply of the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0281] To meet different power usage requirements, the battery 100 can include one or more battery cells 20. For example, as ​ and ​ shown, it is a schematic structural diagram of a battery 100 according to an embodiment of the present application. The battery 100 can include a plurality of battery cells 20. The battery 100 can also include a box body 10. The inside of the box body 10 is a hollow structure, and a plurality of battery cells 20 are accommodated in the box body 10. For example, a plurality of battery cells 20 are placed in the box body 10 after being connected in parallel, in series, or in a mixed connection.

[0282] Optionally, the battery 100 can also include other structures, which will not be elaborated one by one here. For example, the battery 100 can also include a busbar component (not shown in the figure). The busbar component is used to realize the electrical connection between a plurality of battery cells 20, such as in parallel, in series, or in a mixed connection. Specifically, the busbar component can realize the electrical connection between the battery cells 20 by connecting the electrode terminals of the battery cells 20. Further, the busbar component can be fixed to the electrode terminals of the battery cells 20 by welding. The electrical energy of a plurality of battery cells 20 can be further led out through a conductive mechanism passing through the box body. Optionally, the conductive mechanism can also belong to the busbar component.

[0283] According to different power demands, the number of battery cells 20 can be set to any value. For example, there can be one battery cell 20. Multiple battery cells 20 can be connected in series, parallel, or a combination of both to achieve a larger capacity or power. Since the number of battery cells 20 included in each battery 100 may be large, for ease of installation, the battery cells 20 can be grouped, and each group of battery cells 20 forms a battery module. The number of battery cells 20 included in a battery module is not limited and can be set according to requirements. A battery can include multiple battery modules, and these battery modules can be connected in series, parallel, or a combination of both.

[0284] As ​ shown, it is a schematic structural diagram of a battery cell 20 according to an embodiment of the present application. The battery cell 20 includes one or more electrode assemblies 22, a housing 211, and a cover plate 212. The housing 211 and the cover plate 212 form the outer shell or battery case 21 of the battery cell 20. The walls of the housing 211 and the cover plate 212 are both referred to as the walls of the battery cell 20. For a cuboid-shaped battery cell 20, the walls of the housing 211 include a bottom wall and four side walls. The housing 211 is determined according to the shape after combining one or more electrode assemblies 22. For example, the housing 211 can be a hollow cuboid, cube, or cylinder, and one of the surfaces of the housing 211 has an opening so that one or more electrode assemblies 22 can be placed inside the housing 211. For example, when the housing 211 is a hollow cuboid or cube, one of the flat surfaces of the housing 211 is the opening surface, that is, this plane does not have a wall body and makes the inside and outside of the housing 211 communicate. When the housing 211 can be a hollow cylinder, the end face of the housing 211 is the opening surface, that is, this end face does not have a wall body and makes the inside and outside of the housing 211 communicate. The cover plate 212 covers the opening 10 and is connected to the housing 211 to form a closed cavity for placing the electrode assembly 22. The housing 211 is filled with an electrolyte, such as an electrolytic solution.

[0285] The battery cell 20 may further include two electrode terminals 214, and the two electrode terminals 214 can be arranged on the cover plate 212. The cover plate 212 is usually in the shape of a flat plate. The two electrode terminals 214 are fixed on the flat surface of the cover plate 212. The two electrode terminals 214 are respectively a positive electrode terminal 214a and a negative electrode terminal 214b. Each electrode terminal 214 is correspondingly provided with a connection member 23, or it can also be called a current collector member, 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.

[0286] As ​As 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 the positive tab, the second tab 222a is the negative tab. The first tabs 221a of one or more electrode assemblies 22 are connected to an electrode terminal through a connecting member 23, and the second tabs 222a of one or more electrode assemblies 22 are connected to another electrode terminal through another connecting member 23. For example, the positive electrode terminal 214a is connected to the positive tab through a connecting member 23, and the negative electrode terminal 214b is connected to the negative tab through another connecting member 23.

[0287] In the battery cell 20, according to actual usage requirements, the electrode assembly 22 can be provided as a single unit or multiple units, such as ​ As shown, there are 4 independent electrode assemblies 22 provided in the battery cell 20.

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

[0289] The pressure relief mechanism 213 can be various possible pressure relief structures, and the embodiments of the present application do not limit this. For example, the pressure relief mechanism 213 can be a temperature-sensitive pressure relief mechanism, and the temperature-sensitive pressure relief mechanism is configured to be able to melt when the internal temperature of the battery cell 20 provided with the pressure relief mechanism 213 reaches a threshold value; and / or, the pressure relief mechanism 213 can be a pressure-sensitive pressure relief mechanism, and the pressure-sensitive pressure relief mechanism is configured to be able to rupture when the internal air pressure of the battery cell 20 provided with the pressure relief mechanism 213 reaches a threshold value.

[0290] ​ The structure diagram of the battery 100 according to an embodiment of the present application is shown.

[0291] As ​ shown, the battery 100 includes a box body 10, a battery cell 20, and a reinforcing member 30. The box body 10 has a receiving cavity 10a, the battery cell 20 is received in the receiving cavity 10a, the battery cell 20 includes an electrode assembly 22 and an electrode terminal 214, and the electrode assembly 22 is electrically connected to the electrode terminal 214 so that the battery cell 20 is used to provide electrical energy; and the battery cell 20 includes a first wall 201, the first wall 201 is the wall with the largest area in the battery cell 20, the reinforcing member 30 is disposed opposite to the first wall 201, the reinforcing member 30 is fixedly connected to the first wall 201, and the reinforcing member 30 is thermally connected to the first wall 201.

[0292] It can be seen that by fixedly connecting the large side surface of the battery cell 20, i.e., the first wall 201, to the reinforcing member 30, it is convenient to ensure a reliable connection between the battery cell 20 and the reinforcing member 30; the first wall 201 of the battery cell 20 is in thermal conduction connection with the reinforcing member 20, which is beneficial to the heat exchange of the battery cell 20 and ensures the performance of the battery 100. 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 the temperature of the battery cell 20. When the temperature of the battery cell 20 is too low, the reinforcing member 30 can heat the battery cell 20 to increase the temperature of the battery cell 20.

[0293] For example, there are multiple battery cells 20 in the battery 100, and the multiple battery cells 20 are arranged along the second direction y. That is, the second direction y is the arrangement direction of the multiple battery cells 20 in a column of battery cells 20 in the battery 100. That is to say, a column of battery cells 20 in the battery 100 is arranged along the second direction y. The number of battery cells 20 in a column of battery cells 20 can be 2 - 20, but the embodiments of the present application do not limit this; the reinforcing member 30 extends along the second direction y, and the reinforcing member 30 is fixedly connected to the first wall 201 of each battery cell 20 among the multiple battery cells 20. The first wall 201 with the largest surface area in the battery cell 20 is in thermal conduction connection with the reinforcing member 2. That is to say, the first wall 201 of the battery cell 20 faces the reinforcing member 30, that is, the first wall 201 of the battery cell 20 can be parallel to the second direction y.

[0294] It can be seen that by connecting the first wall 201 with the largest surface area of each battery cell 20 among the multiple battery cells 20 to the reinforcing member 30, and connecting the multiple battery cells 20 into a whole through the reinforcing member 30. In this case, side plates may not need to be provided inside the battery 100, and structures such as beams may not be required either, which can greatly improve the space utilization rate inside the battery 100 and increase the energy density of the battery 100; moreover, the reinforcing member 30 can be used to conduct the heat of the battery cell 20, so as to conduct the heat of each battery cell 20 by using the reinforcing member 30, which can ensure that the temperature of the battery cell 20 is in a normal state and improve the service life and safety performance of the battery cell 20.

[0295] Moreover, when a certain battery cell 20 has a thermal runaway, the heat generated by the thermally runaway battery cell 20 will be taken away by the reinforcing member 30 that exchanges heat with it, reducing the temperature of the thermally runaway battery cell 20 and preventing adjacent battery cells 20 from having a thermal runaway problem, thereby ensuring the safety performance of the battery cell 20.

[0296] Of course, there can also be one battery cell 20 in the battery 100.

[0297] Optionally, the first wall 201 abuts directly against the reinforcing member 30 to achieve heat transfer between the battery cell 20 and the reinforcing member 30; or the first wall 201 abuts indirectly against the reinforcing member 30. For example, the first wall 201 abuts against the reinforcing member 30 through a heat-conducting member such as heat-conducting glue, etc., and heat transfer between the battery cell 20 and the reinforcing member 30 can also be achieved. Obviously, the heat-conducting connection between the reinforcing member 30 and the first wall 201 facilitates ensuring the heat management ability of the reinforcing member 30 for the battery cell 20.

[0298] In some embodiments, as ​ shown, the battery cell 20 further includes a second wall 202 connected to the first wall 201. The first wall 201 and the second wall 202 intersect, so the first wall 201 and the second wall 202 are not parallel, and the first wall 201 and the second wall 202 have a common line; wherein, the electrode terminal 214 is disposed on the second wall 202, then the electrode terminal 214 is disposed on the wall of the battery cell 20 that intersects with the first wall 201 and is other than the first wall 201, so as to facilitate the setting of the electrode terminal 214 and at the same time facilitate the avoidance of the electrode terminal 214 and the reinforcing member 30, so that there is no need to provide an avoidance portion on the reinforcing member 30 for avoiding the electrode terminal 214, which is beneficial to simplifying the structure of the reinforcing member 30.

[0299] For example, in ​ and ​ the example, the battery cell 20 is generally formed in a cuboid structure, and the length of the battery cell 20 is greater than the width and height of the battery cell 20. The first wall 201 is located on one side of the battery cell 20 in the first direction x, and at least one side of the two sides of the battery cell 20 in the second direction y has a second wall 202, and at least one side of the two sides of the battery cell 20 in the third direction z has a second wall 202. The electrode terminal 214 can be disposed on the second wall 202 of the battery cell 20 in the third direction z; of course, as ​ shown, the electrode terminal 214 can also be disposed on the second wall 202 of the battery cell 20 in the second direction y.

[0300] Optionally, in ​ the example, the battery cell 20 can be a blade battery. The length of the battery cell 20 > the width of the battery cell 20 > the height of the battery cell 20. The length of the battery cell 20 in the second direction y > the width of the battery cell 20 in the third direction z > the height of the battery cell 20 in the first direction x. The first wall 201 is located at one end of the battery cell 20 in the height direction, and the electrode terminal 214 is disposed on the second wall 202, then the electrode terminal 214 can be located at one or both ends of the battery cell 20 in the length direction and / or the electrode terminal 214 is located at one or both ends of the battery cell 20 in the width direction.

[0301] Of course, in the present application, the setting position of the electrode terminal 214 is not limited thereto. For example, ​ and ​ as shown, the electrode terminal 214 can also be provided on the first wall 201, which is also convenient for the arrangement of the electrode terminal 214; for example, the battery cell 20 is a One-Stop battery cell. It can be seen that for the battery 100 in the embodiment of the present application, the setting position of the electrode terminal has good flexibility.

[0302] In some embodiments, for example, ​ as shown, there are multiple battery cells 20, and the multiple battery cells 20 are arranged in the first direction x. In the first direction x, each battery cell 20 is provided with a first surface 203 opposite to the first wall 201, and the first surface 203 is provided with an avoidance groove 203a. The avoidance groove 203a of one of the two adjacent battery cells 20 is used to accommodate the electrode terminal 214 of the other battery cell 20. The first direction x is perpendicular to the first wall 201, so as to facilitate the compact arrangement of the multiple battery cells 20 in the first direction and save the occupied space.

[0303] In some embodiments, for example, ​ as shown, the electrode terminal 214 is provided on the second wall 202. The battery cell 20 includes two first walls 201 arranged oppositely and two second walls 202 arranged oppositely. The electrode terminal 214 is provided with at least two, and the multiple electrode terminals 214 include a positive electrode terminal 214a and a negative electrode terminal 214b.

[0304] Among them, at least two electrode terminals 214 are provided on the same second wall 202, which is beneficial to saving the occupied space of the battery cell 20 on the premise of ensuring a proper distance between adjacent electrode terminals 214; or, at least one electrode terminal 214 is provided on each second wall 202, so that the electrode terminals 214 on different second walls 202 have sufficient distances.

[0305] For example, in the examples of ​ and ​ , the battery cell 20 includes two first walls 201 arranged oppositely in the first direction x and two second walls 202 arranged oppositely in the 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; the multiple electrode terminals 214 are all located on the same second wall 202 of the battery cell 20 in the third direction z.

[0306] Of course, for a cuboid-shaped battery cell 20, the battery cell 20 can also include two second walls 202 arranged oppositely in the second direction y. The second direction y is not parallel to the first direction, for example, the second direction y is perpendicular to the first direction x; the multiple electrode terminals 214 are all located on the same second wall 202 of the battery cell 20 in the second direction y.

[0307] Whether multiple electrode terminals 214 are located on one side of the battery cell 20 in the second direction y or on one side of the battery cell 20 in the third direction z, when there are multiple battery cells 20 and the multiple battery cells 20 are arranged in sequence in the second direction y, in the second direction y, the second walls 202 of two adjacent battery cells 20 face each other.

[0308] 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 is a plane or a curved surface.

[0309] In some embodiments, as ​ shown, the first wall 201 is formed in a cylindrical shape; at this time, the battery cell 20 can be approximately a cylindrical battery cell.

[0310] In some embodiments, as ​ shown, second walls 202 are provided at both axial ends of the first wall 201, and at least one second wall 202 is provided with an electrode terminal 214. Then, all the 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. Thus, it is convenient to realize the flexible arrangement of the electrode terminals 214.

[0311] In some embodiments, as ​ shown, one of the second walls 202 is provided with an exposed electrode terminal 214. The electrode assembly 22 includes a positive electrode sheet 221 and a negative electrode sheet 222. One of the positive electrode sheet 221 and the negative electrode sheet 222 is electrically connected to the electrode terminal 214, and the other of the positive electrode sheet 221 and the negative electrode sheet 222 is electrically connected to the first wall 201, so as to realize the normal power supply of the battery cell 20.

[0312] Of course, the above-mentioned other one of the positive electrode sheet 221 and the negative electrode sheet 222 can also be electrically connected to the other second wall 202, that is to say, the second wall 202 provided with the exposed electrode terminal 214 is not the same wall as the second wall 202 electrically connected to the above-mentioned other one of the positive electrode sheet 221 and the negative electrode sheet 222, and it is also convenient to realize the normal power supply of the battery cell 20.

[0313] In some embodiments, at least one battery cell 20 is a soft-pack battery cell. Then, when the battery 100 includes one battery cell 20, this battery cell 20 is a soft-pack battery cell; when the battery 100 includes multiple battery cells 20, at least one of the multiple battery cells 20 is a soft-pack battery cell. Thus, it is convenient to enrich the types, structures, and layouts of the battery cells 20 of the battery 100, etc., so as to be conducive to making the battery 100 meet the actual differentiated requirements.

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

[0315] Of course, in other embodiments of the present application, the battery cell 20 further includes a pressure relief mechanism 213, and the pressure relief mechanism 213 and the electrode terminal 214 are respectively disposed on two walls of the battery cell 20.

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

[0317] In some embodiments, the reinforcing member 30 is bonded to the first wall 201 through a first adhesive layer, so that the reinforcing member 30 is bonded to the first wall 201 to achieve a reliable and stable connection between the reinforcing member 30 and the first wall 201, so as to ensure that the overall battery 100 has a certain stiffness and strength. At the same time, the consumption of materials and the overall weight are reduced, which is beneficial to the lightweight design of the battery 100, and the structure is simple, making the structure more compact and facilitating processing and assembly.

[0318] Optionally, the first adhesive layer may include a thermally conductive structural adhesive, which not only has good bonding effect, but also has characteristics such as thermal conductivity, aging resistance, fatigue resistance, and corrosion resistance, and can improve the connection strength and thermal management efficiency between the battery cell 20 and the reinforcing member 30, making the heat transfer between the battery cell 20 and the reinforcing member 30 more rapid. Of course, the first adhesive layer also includes double-sided tape, etc.

[0319] It should be understood that the reinforcing member 30 and the first wall 201 may also be connected by other means, such as riveting, welding, etc., and the present application does not limit this.

[0320] 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 to achieve a fixed connection between the reinforcing member 30 and the bottom wall of the receiving cavity 10a, and the structure is simple and convenient for processing and assembly; at this time, the reinforcing member 30 is respectively bonded and fixed to the first wall 201 and the bottom wall of the receiving cavity 10a to ensure the reliable setting of the reinforcing member 30.

[0321] In some embodiments, the bottom of the battery cell 20 is adhesively 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 adhesively bonded to the bottom wall of the receiving cavity 10a to achieve a fixed connection between the battery cell 20 and the bottom wall of the receiving cavity 10a. The structure is simple and convenient for processing and assembly. At this time, the reinforcing member 30 is adhesively fixed to the first wall 201, and the battery cell 20 is adhesively fixed to the bottom wall of the receiving cavity 10a, so that the reinforcing member 30 is indirectly fixedly connected to the bottom wall of the receiving cavity 10a through the battery cell 20.

[0322] In some embodiments, the bottom of the reinforcing member 30 is adhesively bonded to the bottom wall of the receiving cavity 10a through a second adhesive layer, and the bottom of the battery cell 20 is adhesively bonded to the bottom wall of the receiving cavity 10a through a third adhesive layer.

[0323] In some embodiments, at least part of the heat of the battery cell 20 can be transferred to the reinforcing member 30 through the first adhesive layer, and the thickness of the first adhesive layer is less than or equal to the thickness of the second adhesive layer. This is beneficial to reducing the heat transfer resistance between the battery cell 20 and the reinforcing member 30 and ensuring the heat transfer efficiency between the battery cell 20 and the reinforcing member 30 on the premise of ensuring reliable connections between the battery cell 20 and the reinforcing member 30 and between the reinforcing member 30 and the bottom wall of the receiving cavity 10a.

[0324] In some embodiments, the thickness of the first adhesive layer is less than or equal to the thickness of the third adhesive layer, which is also beneficial to reducing the heat transfer resistance between the battery cell 20 and the reinforcing member 30 and ensuring the heat transfer efficiency between the battery cell 20 and the reinforcing member 30 on the premise of ensuring reliable connections between the battery cell 20 and the reinforcing member 30 and between the battery cell 20 and the bottom wall of the receiving cavity 10a respectively.

[0325] 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. Then, the thicknesses of the first adhesive layer, the second adhesive layer, and the third adhesive layer are reasonably set to ensure the reasonable distribution and utilization of the adhesive and achieve the reliable setting of the battery cell 20 and the reinforcing member 30 in the receiving cavity 10a.

[0326] In some embodiments, the thermal conductivity of the first adhesive layer is greater than or equal to the thermal conductivity of the second adhesive layer, and at least part of the heat of the battery cell 20 can be transferred to the reinforcing member 30 through the first adhesive layer. This is beneficial to reducing the heat transfer resistance between the battery cell 20 and the reinforcing member 30 and ensuring the heat transfer efficiency between the battery cell 20 and the reinforcing member 30 on the premise of ensuring reliable connections between the battery cell 20 and the reinforcing member 30 and between the reinforcing member 30 and the bottom wall of the receiving cavity 10a.

[0327] 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 reduce the heat transfer 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 while ensuring reliable connection between the battery cell 20 and the reinforcing member 30 and the bottom wall of the accommodating cavity 10a respectively.

[0328] Of course, part of the heat of the battery cell 20 can also be transferred to the bottom wall of the accommodating cavity 10a through the third adhesive layer for dissipation.

[0329] 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 realize the reasonable distribution and utilization of the adhesive, ensure the stable arrangement of the battery cell 20 and the reinforcing member 30, and ensure the rapid dissipation of the heat of the battery cell 20.

[0330] In some embodiments, the ratio of the thickness of the first adhesive layer to the thermal conductivity of the first adhesive layer is the first ratio, the ratio of the thickness of the second adhesive layer to the thermal conductivity of the second adhesive layer is the second ratio, and the ratio of the thickness of the third adhesive layer to the thermal conductivity of the third adhesive layer is the third ratio.

[0331] 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, on the premise of ensuring the heat exchange effect of the battery cell 20, the colloid is effectively and reasonably utilized, which is convenient for realizing the reasonable distribution of the colloid.

[0332] 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 those of the second adhesive layer and the third adhesive layer respectively.

[0333] In some embodiments, the battery 100 includes a plurality of battery modules 100a. The battery module 100a includes at least one row of battery packs 20A and at least one reinforcing member 30. The battery pack 20A includes a plurality of battery cells 20 arranged in a row along the second direction y. The first wall 201 of each battery cell 20 of the battery pack 20A is fixedly and thermally connected to the reinforcing member 30 respectively. The battery pack 20A and the reinforcing member 30 can be multiple respectively, and the multiple battery packs 20A and the multiple reinforcing members 30 are alternately arranged along the first direction x.

[0334] Optionally, the battery module 100a includes N groups of battery packs 20A and N - 1 reinforcement members 30. The reinforcement members 30 are disposed between adjacent two groups of battery packs 20A, where N is an integer greater than 1. Taking N = 2 as an example, multiple battery modules 100a are arranged along the first direction x, and there is a gap between adjacent battery modules 100a. Of course, the reinforcement member 30 can also be disposed between the battery pack 20A and the inner wall of the box body 10.

[0335] In some embodiments, a row of battery cells 20 arranged along the second direction y can be connected to the reinforcement member 30 only on one side in the first direction, or can be connected to the reinforcement member 30 on both sides in the first direction. The embodiments of the present application do not limit this.

[0336] In some embodiments, the reinforcement member 30 is a heat conducting member 3a. The heat conducting member 3a is used for heat exchange with the battery cell 20 to ensure the heat conduction efficiency of the reinforcement member 30 and ensure that the battery cell 20 has a suitable temperature. Of course, the reinforcement member 30 can also be a heat management component 3b, and the heat management component 3b is also used for heat exchange with the battery cell 20 to make the battery cell 20 have a suitable temperature.

[0337] It can be understood that in the present application, the heat conducting member 3a can also be referred to as the heat management component 3b; of course, the heat conducting member 3a can also be referred to as the partition 33 having the function of heat conduction and heat exchange with the battery cell 20 described later.

[0338] In some embodiments, the heat conducting member 3a includes metal materials and / or non-metal materials, so that the heat conducting member 3a has a flexible material selection setting, which is convenient for the heat conducting member 3a to have other good properties in addition to good heat conduction ability, so as to better meet the actual differentiated requirements.

[0339] In some embodiments, as ​ shown, the heat conducting member 3a includes a metal plate 31 and an insulating layer 32. The insulating layer 32 is disposed on the surface of the metal plate 31. Through this setting, the metal plate 31 can ensure the strength of the heat conducting member 3a, and the insulating layer 32 can make the surface of the heat conducting member 3a connected to the first wall 201 an insulating surface, avoiding the electrical connection between the metal plate 31 and the battery cell 20 to ensure electrical insulation in the battery 100.

[0340] Optionally, the insulating layer 32 can be an insulating film adhered to the surface of the metal plate 31 or insulating paint coated on the surface of the metal plate 31.

[0341] In some embodiments, the heat conducting member 3a is a non-metal material plate; that is to say, the heat conducting member 3a is entirely made of non-metal insulating material. Of course, in other embodiments, a part of the heat conducting member 3a is made of non-metal material.

[0342] In some embodiments, as ​As shown, a cavity 30a is provided in the heat conducting member 3a. The cavity 30a can reduce the weight of the heat conducting member 3a while ensuring the strength of the heat conducting member 3a. For example, it can be applied to the case where the thickness of the heat conducting member 3a is relatively large. In addition, the cavity 30a can provide a relatively large compression space for the heat conducting member 3a in the direction perpendicular to the first wall 201 (for example, the first direction x), so as to provide a relatively large expansion space for the battery cell 20.

[0343] Optionally, the cavity 30a can be used to accommodate a fluid to adjust the temperature of the battery cell 20.

[0344] The fluid is a heat exchange medium, which can be a liquid or a gas. Adjusting the temperature means heating or cooling one or more battery cells 20. In the case of cooling the battery cell 20, the cavity 30a can accommodate a cooling medium to adjust the temperature of one or more battery cells 20. At this time, the fluid can also be referred to as a cooling medium or a cooling fluid, and more specifically, it can be referred to as a coolant or a cooling gas. In addition, the fluid can also be used for heating, and the embodiments of the present application do not limit this. Optionally, the fluid can flow cyclically to achieve a better temperature adjustment effect. Optionally, the fluid can be water, a mixture of water and ethylene glycol, heat conducting oil, refrigerant, air, etc.

[0345] In some embodiments, as ​ 、 ​ and ​ shown, there are multiple battery cells 20, and the multiple battery cells 20 are arranged along the second direction y; the strengthening member 30 includes a partition plate 33, the partition plate 33 extends along the second direction y, and the partition plate 33 is connected to the first wall 201 of each battery cell 20 among the multiple battery cells 20, and the second direction y is parallel to the first wall 201.

[0346] Thus, the first wall 201 with the largest surface area of each battery cell 20 among the multiple battery cells 20 is connected to the partition plate 33, and the multiple battery cells 20 are connected into a whole through the partition plate 33. Then, side plates and structures such as beams do not need to be provided inside the battery 100, and the space utilization rate inside the battery 100 can be greatly improved, and the energy density of the battery 100 can be increased.

[0347] As the battery is used, the blue film on the surface of the battery cell is prone to breakage. In the case of the breakage of the blue film, insulation failure occurs between adjacent battery cells and between the battery cell and the battery box, and the risk of battery short circuit increases. And in order to adjust the temperature of the battery cell, a water cooling plate or a heating plate is provided between adjacent battery cells, and the surface of the water cooling plate or the heating plate has no insulation protection. The water vapor inside the battery is easy to liquefy on the surface of the water cooling plate or the heating plate. In the case of the breakage of the blue film, the risk of battery short circuit further increases.

[0348] Based on the above considerations, in order to alleviate the problem of battery short - circuit caused by the damage of the blue film, after in - depth research, the inventor sets that the reinforcing member 30 further includes an insulating layer 32, and the insulating layer 32 is used for insulating and isolating the first wall 201 of the battery cell 20 and the separator 33.

[0349] The insulating layer 32 is arranged on the surface of the separator 33 and is not easily damaged due to the expansion of the battery cell's shape or self - heating. When there is no insulating structure on the surface of the battery cell or the blue film on the surface of the battery cell is damaged, when the water vapor inside the battery cell liquefies on the surface of the separator, the insulating layer 32 arranged on the surface of the separator 33 can play an insulating role between the battery cell 20 and the separator 33, which is beneficial to alleviating the problem of the battery 100 short - circuit 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, reducing the risk of battery 100 short - circuit, and improving the electrical safety of the electrical device.

[0350] Among them, the insulating layer 32 is connected to the surface of the separator 33 so that the insulating layer 32 can cover part or all of the surface of the separator 33.

[0351] In some embodiments, the separator 33 is a thermal management component 3b, and the thermal management component 3b is used for heat exchange with the battery cell 20. The thermal management component 3b is a structure for heat exchange with the battery cell 20, such as a heating resistance wire, a heat - conducting member through which a heat - exchange medium passes, and some materials that can undergo chemical reactions to generate temperature changes according to the changing 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 avoid thermal runaway due to the too - high temperature of the battery cell 20; 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 work normally.

[0352] The thermal management component 3b can also be a structure capable of accommodating a fluid medium. Heat is transferred between the battery cell 20 and the fluid medium through 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 (such as water) or a gas (such as air). In this case, if the temperature of the fluid medium accommodated 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 avoid thermal runaway due to the too - high temperature of the battery cell 20; if the temperature of the fluid medium accommodated inside the thermal management component 30 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 work normally.

[0353] Optionally, the thermal management component 3b may be disposed on one side of the battery cell 20 and between the battery cell 20 and the box body 10, or may be disposed between two adjacent battery cells 20.

[0354] In some embodiments, the insulating layer 32 may only insulate and isolate the battery cell 20 and the separator 33. In other embodiments, the insulating layer 32 may not only insulate and isolate the battery cell 20 and the separator 33, but also insulate and isolate the separator 33 and the inner wall of the box body 10, further reducing the risk of short circuit of the battery 100, thereby further improving the safety of the battery 100.

[0355] For example, a plurality of battery cells 20 are stacked and arranged in the first direction x. A separator 33 may be disposed between two adjacent battery cells 20. Insulating layers 32 are respectively disposed on opposite sides of the separator 33, so that each battery cell 20 among two adjacent battery cells 20 is insulated and isolated from the separator 33 through the insulating layer 32.

[0356] For another example, along the stacking direction of the plurality of battery cells 20, a separator 33 may also be disposed between the two battery cells 20 at the outermost ends and the inner wall of the box body 10. The insulating layer 32 connected to the separator 33 may only insulate and isolate the battery cell 20 and the separator 33; of course, the insulating layer 32 connected to the separator 33 may not only insulate and isolate the battery cell 20 and the separator 33, but also insulate and isolate the separator 33 and the inner wall of the box body 10, further reducing the risk of short circuit of the battery 100, thereby further improving the safety of the battery 100.

[0357] In some embodiments, if the thermal conductivity coefficient λ of the insulating layer 32 is greater than or equal to 0.1 W / (m·K), the insulating layer 32 has good thermal conductivity, so that the insulating layer 32 can play a role in transferring heat, enabling good heat conduction ability between the battery cell 20 and the separator 33, thereby improving the heat exchange efficiency between the battery cell 20 and the separator 33; for example, when the separator 33 is the thermal management component 3b, it is convenient to effectively ensure that the battery cell 20 has an appropriate temperature.

[0358] The thermal conductivity coefficient refers to the amount of heat transferred through an area of 1 square meter in 1 hour under steady heat transfer conditions, with a temperature difference of 1 degree (K, °C) between the two surfaces of a material with a thickness of 1 m. The unit is watt per meter degree (W / (m·K), where K can be replaced by °C here).

[0359] In some embodiments, the density G of the insulating layer 32 ≤ 1.5 g / cm 3 .

[0360] An insulating layer 32 is provided on the surface of the thermal management component 3b, which will increase the weight of the battery 100. The smaller the density of the insulating layer 32, the smaller the mass of the insulating layer 32; the larger the density of the insulating layer 32, the larger the mass of the insulating layer 32. The density G of the insulating layer 32 ≤ 1.5 g / cm3, so that the weight of the insulating layer 32 is smaller, and thus the weight of the battery 100 is smaller, reducing the impact of the setting of the insulating layer 32 on the weight of the battery 100, which is beneficial to the lightweight of the battery 100.

[0361] In some embodiments, the compressive strength P of the insulating layer 32 satisfies 0.01 Mpa ≤ P ≤ 200 Mpa, which can make the insulating layer 32 have a certain elasticity, so that the insulating layer 32 can reduce the impact on the whole battery 100 through its own deformation when the battery cell 20 expands and deforms. Or, the elastic insulating layer 32 can also play a buffering role through its own deformation when the battery 100 is subjected to impact, play a certain protective role for the battery cell 20, and improve the safety of the battery 100.

[0362] The compressive strength refers to the maximum compressive stress that the specimen withstands until it ruptures or yields in a compression test.

[0363] There are various choices for the material of the insulating layer 32. For example, in some embodiments, the material of the insulating layer 32 includes at least one of polyethylene terephthalate, polyimide, and polycarbonate.

[0364] The material of the insulating layer 32 can only include one of polyethylene terephthalate, polyimide, and polycarbonate. In some other embodiments, the material of the insulating layer 32 can include two or three of polyethylene terephthalate, polyimide, and polycarbonate. For example, the insulating layer 32 includes a first insulating part and a second insulating part arranged in a stacked manner. The material of the first insulating part is polyethylene terephthalate, and the material of the second insulating part is polyimide, or the material of the first insulating part is polyimide, and the material of the second insulating part is polycarbonate, or the material of the first insulating part is polyethylene terephthalate, and the material of the second insulating part is polycarbonate. In still some other embodiments, the insulating layer 32 includes a first insulating part, a second insulating part, and a third insulating part arranged in a stacked manner. The material of the first insulating part is polyethylene terephthalate, the material of the second insulating part is polyimide, and the material of the third insulating part is polycarbonate.

[0365] Polyethylene terephthalate, polyimide, and polycarbonate have advantages such as good impact resistance and good heat aging performance. Therefore, the material of the insulating layer 32 includes at least one of polyethylene terephthalate, polyimide, and polycarbonate, and the insulating layer 32 has advantages such as good impact resistance and good heat aging performance. In addition, the thermal conductivity of polyethylene terephthalate is generally 0.24 W / m·K, the thermal conductivity of polyimide is generally 0.1 - 0.5 W / m·K, and the thermal conductivity of polycarbonate is generally 0.16 - 0.25 W / m·K. Therefore, all three materials have good thermal conductivity. Using at least one of the three materials to form the insulating layer 32, the insulating layer 32 has good thermal conductivity, improving the heat transfer performance and heat transfer efficiency between the battery cell 20 and the separator 33.

[0366] 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 can be connected to the battery cell 20 or not. The insulating layer 32 being a coating applied to the surface of the separator 33 can make the insulating layer 32 fit more closely 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 peeling off from the separator 33.

[0367] For another example, in some other embodiments, the insulating layer 32 and the separator 33 are connected through an adhesive layer. The adhesive layer can be an adhesive layer provided 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 through another adhesive layer or not. Connecting the insulating layer 32 and the separator 33 through the adhesive layer is a simple and convenient connection method.

[0368] For another example, in some other embodiments, the insulating layer 32 is potted between the separator 33 and the battery cell 20. Potting is a process of pouring a liquid composite into a device mechanically or manually and curing it into a thermosetting polymer insulating material with excellent performance at normal temperature or under heating conditions. 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, improving the ability to resist external impact and vibration.

[0369] In some embodiments, such as ​As shown, the dimension T1 of the partition 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 dimension of the partition 33 in the first direction x from being too large and occupying too much space inside the battery 100, further improving the space utilization rate inside the battery 100, and thus improving the energy density of the battery 100.

[0370] In some embodiments, the dimension T1 of the partition 33 in the first direction x is not less than 0.05 mm. This can prevent the dimension of the partition 33 in the first direction x from being too small, that is, the thickness of the partition 33 is small and the stiffness of the partition 33 is small, so that the strength requirements of the battery 100 cannot be met.

[0371] In some embodiments, as ​ shown in (c) of, an insulating layer 32 is provided on the surface of the partition 33 to prevent the electrical connection between the partition 33 and the battery cell 20, and improve the safety of the battery 100. Optionally, the insulating layer 32 can be an insulating film adhered to the surface of the partition 33 or an insulating paint coated on the surface of the partition 33.

[0372] In some embodiments, the dimension T2 of the insulating layer 32 in the first direction x satisfies: 0.01 mm ≤ T2 ≤ 0.3 mm.

[0373] When the dimension T2 of the insulating layer 32 in the first direction x is too small, the insulating layer 32 cannot effectively prevent the electrical connection between the battery cell 20 and the partition 33, and the battery 100 will have a poor insulation situation, posing a safety hazard. When the dimension T2 of the insulating layer 22 in the first direction x is too large, it will occupy too much space inside the battery 100, which is not conducive to improving the energy density of the battery 100. Therefore, the value of T2 is set to 0.01 mm to 0.3 mm, so that both the energy density of the battery 100 can be improved and the safety of the battery 100 can be ensured.

[0374] In the embodiments of the present application, the voltage E of the battery 100 and the dimension T2 of the insulating layer 32 in the first direction x satisfy: 0.01×10 -3 mm / V ≤ T2 / E ≤ 3×10 -3 mm / V.

[0375] The insulation effect of the insulation layer 32 is not only related to the thickness of the insulation layer 32, but also related to the thickness of the insulation layer 32 corresponding to the unit voltage. When T2 / E is too small, that is, when the size T2 of the insulation layer 32 in the first direction x corresponding to the unit voltage is too small, the insulation layer 32 cannot effectively prevent the electrical connection between the battery cell 20 and the separator 33, and the battery 100 will have poor insulation, posing a safety hazard. When T2 / E is too large, that is, when the size T2 of the insulation layer 32 in the first direction x corresponding to the unit voltage 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 -3 ~3×10 -3 mm / V, which can not only improve the energy density of the battery 100, but also ensure the safety of the battery 100.

[0376] In some embodiments of the present invention, the area S1 of the surface of the separator 33 connected to the first walls 201 of the plurality of battery cells 20 and the total area S2 of the first walls 201 of the plurality of battery cells 20 connected to the same side of the separator 33 satisfy: 0.25 ≤ S1 / S2 ≤ 4, where S1 = H1*L1 and S2 = H2*L2. As ​ shown, H1 is the size of the separator 33 in the third direction z, L1 is the size of the separator 33 in the second direction y, H2 is the size of a single battery cell 20 in the third direction z, and L2 is the sum of the sizes of the plurality of battery cells 20 in the second direction y.

[0377] When the value of S1 / S2 is too small, that is, when the area S1 of the surface of the separator 33 connected to the first walls 201 of the plurality of battery cells 20 is much smaller than the total area S2 of the first walls 201 of the plurality of battery cells 20 connected to the same side of the separator 33, the contact area between the first walls 201 and the separator 33 is too small to meet the strength requirements of the battery 100; when the value of S1 / S2 is too large, that is, when the area S1 of the surface of the separator 33 connected to the first walls 201 is much larger than the total area S2 of the first walls 201 of the plurality of battery cells 20 connected to the same side of the separator 33, compared with the battery cells 20, the separator 33 occupies too much space inside the battery 100, which is not conducive to improving the energy density of the battery 100; therefore, the value of S1 / S2 is set to 0.25 - 4, which can not only improve the energy density of the battery 100, but also enhance the strength of the battery 100.

[0378] In some embodiments, 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.

[0379] When H1 / H2 is too small, that is, in the third direction z, the size H1 of the partition 33 is much smaller than the size H2 of the first wall 201 of the battery cell 20, the contact area between the first wall 201 and the partition 33 is too small to meet the strength requirements of the battery 100; when H1 / H2 is too large, that is, in the third direction z, the size H1 of the partition 33 is much larger than the size H2 of the first wall 201 of the battery cell 20, the partition 33 occupies too much space inside the battery 100 compared with 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 0.2-2, which can not only improve the energy density of the battery 100 but also enhance the strength of the battery 100.

[0380] In some embodiments, as ​ shown, in the second direction y, the size L1 of the partition 33 and the size L2 of the plurality of battery cells 20 satisfy: 0.5≤L1 / L2≤2.

[0381] When L1 / L2 is too small, that is, in the second direction y, the size L1 of the partition 33 is much smaller than the size L2 of the first wall 201 of the battery cell 20, the contact area between the first wall 201 and the partition 33 is too small to meet the strength requirements of the battery 100; when H1 / H2 is too large, that is, in the second direction y, the size H1 of the partition 33 is much larger than the size L2 of the first wall 201 of the battery cell 20, the partition 33 occupies too much space inside the battery 100 compared with 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 0.5-2, which can not only improve the energy density of the battery 100 but also enhance the strength of the battery 100.

[0382] Optionally, a fixing structure 103 is provided at the end of the partition 33 in the second direction y, and the fixing structure 103 is connected to a fixing member 104 at the end of the partition 33 in the second direction y to fix the partition 33.

[0383] Using the battery cell 20 and the partition 33 shown in ​ the partition anti-vibration and shock test is carried out under the standard of GB38031-2020 "Safety Requirements for Power Batteries for Electric Vehicles", and the test results are shown in Table 1. In Table 1, T1 is the size of the partition in the first direction x, H1 is the size of the partition in the third direction z, L1 is the size of the partition in the second direction y, H2 is the size of a single battery cell in the third direction z, L2 is the sum of the sizes of the plurality of battery cells in the second direction y, S1 = H1*L1, and S2 = H2*L2.

[0384] Table 1

[0385] ​ ​ ​ ​ ​ ​ ​ ​ ​ 0.1 30 400 800 60 4 2 2 ​ 0.5 30 400 200 15 0.25 0.5 1 ​ 0.4 80 1148 1148 40 0.5 1 0.4 ​ 0.4 80 1148 574 80 0.5 0.5 0.8 ​ 0.2 112 1164 1224 100 0.94 1.05 0.19 ​ 0.4 127 348 278.4 63.5 0.4 0.8 0.5 ​ 0.4 127 348 174 63.5 0.25 0.5 0.8 ​ 0.3 205 522 582 193 1.05 1.11 0.27 ​ 0.5 205 522 417.6 102.5 0.4 0.80 0.625 ​ 0.1 112 776 836 100 0.96 1.08 0.09 ​ 0.5 112 1164 1224 100 0.94 1.05 0.48 ​

[0386] Using the attachment​ and ​ For the battery cell 20 and the separator 33 shown in ​ , referring to IEC60664-1, the insulation resistance value is ≥500 MΩ when applying 1000 VDC in the insulation test; the insulation and voltage withstand capacity of the separator is tested under the condition of applying 2700 VDC for 60 s and the leakage current ≤1 mA, and the test results are shown in Table 2. In Table 2, T2 is the dimension of the insulating layer in the first direction x, and E is the battery voltage.

[0387] Table 2

[0388] 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

[0389] In some embodiments, as Figure 30 and Figure 31 shown, the dimension T1 of the separator 33 in the first direction x is greater than 5 mm, and the first direction is perpendicular to the first wall, so as to ensure good reliability in use of the separator 33.

[0390] For example, as Figure 30 shown, the battery 10 includes a plurality of battery cells 20 and separators 33 arranged along the second direction Y, and the separator 33 extends along the second direction Y and is connected to the first wall 201 of each battery cell 20 among the plurality of battery cells 20.

[0391] In some embodiments, the dimension T1 of the separator in the first direction x is not greater than 100 mm.

[0392] When the dimension 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 not greater than 100 mm can effectively improve the energy density of the battery 100.

[0393] In some embodiments, as Figure 31 shown, the dimension T1 of the separator 101 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.

[0394] When T1 / T3 is too small, that is, when the dimension T1 of the partition 33 in the first direction x is much smaller than the dimension T3 of the battery cell 20 in the first direction x, the partition 33 has a weak ability to absorb deformation and cannot match the expansion deformation amount of the battery cell 20, which will reduce the service performance of the battery cell 20. When T1 / T3 is too large, that is, when the dimension T1 of the partition 33 in the first direction x is much larger than the dimension T3 of the battery cell 20 in the first direction x, the partition 33 has too strong an ability to absorb deformation, far exceeding the expansion deformation space required by the battery cell 20. Compared with the battery cell 20, the partition 33 occupies too much space inside the battery 10, which is not conducive to improving the energy density of the battery 10. Therefore, the value of T1 / T3 is set to 0.04 - 2, which can not only improve the energy density of the battery 10 but also absorb the expansion deformation amount of the battery cell 20.

[0395] 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 in the first direction x is 0.01 mm - 0.3 mm.

[0396] By providing the insulating layer 32 on the outer surface of the partition 33, the electrical connection between the battery cell 20 and the partition 33 is avoided, and the safety of the battery 10 is improved. When the dimension T2 of the insulating layer 31 in the first direction x is too small, the insulating layer 32 cannot effectively avoid the electrical connection between the battery cell 20 and the partition 33, and the battery 100 will have a poor insulation situation. 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 0.01 mm - 0.3 mm, which can not only improve the energy density of the battery 100 but also ensure effective insulation between the battery cell 20 and the partition 33.

[0397] Optionally, a current collector element 106 is provided at the end of the partition 33 in the second direction y, and a pipe 107 is provided inside the battery 100. The pipe 107 is used to convey fluid, and the current collector element 106 is used to collect the fluid. For example, the connecting pipe group 42 described later may include the pipe 107.

[0398] Adopt the Figures 30 - 34 The battery cell 20 and the partition 33 shown in the figure are subjected to 1C / 1C charge and discharge cycles at 60°C until the capacity decays to 80% SOC, and the results of the cyclic durability acceleration experiment are obtained. The test results are shown in Table 3. In Table 3, T1 is the dimension of the partition in the first direction x, and T3 is the dimension of the battery cell in the first direction x.

[0399] Table 3

[0400]

[0401]

[0402] In some embodiments, as Figures 10 - 13 shown, since the reinforcing member 30 is fixedly connected to the first walls 201 of one or more battery cells 20 respectively, in order to ensure the performance of the battery 100, the reinforcing member 30 should take into account the strength requirements, and the size of the reinforcing member 30 in the first direction x is set to be 0.1 mm to 100 mm, and the first direction is perpendicular to the first wall 201, so as to take into account both strength and space requirements at the same time.

[0403] Specifically, for the size T4 of the reinforcing member 30 in the first direction, that is, the thickness of the reinforcing member 3, when it is larger, the strength of the reinforcing member 30 is high; when T4 is smaller, the occupied space is less. When T4 < 0.1 mm, the reinforcing member 30 is easily damaged under external force; when T4 > 100 mm, too much space is occupied, affecting the energy density. Therefore, when the size T4 of the reinforcing member 30 in the first direction x is 0.1 mm to 100 mm, the space utilization rate can be improved while ensuring the strength.

[0404] In some embodiments of the present application, a reinforcing member 3 is provided in the battery 100 and connected to the first wall 201 with the largest surface area of each battery cell 20 arranged in a column along the second direction y. Among them, the reinforcing member 30 is used to conduct the heat of the battery cell 20, the surface of the reinforcing member 30 connected to the first wall 201 is an insulating surface, and the size 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, it is not necessary to provide structures such as beams in the middle of the box body 10 of the battery 100, and the space utilization rate inside the battery 100 can be maximally improved, thereby improving the energy density of the battery 100; at the same time, the above-mentioned reinforcing member 30 can also ensure electrical insulation and heat conduction in the battery 100. Therefore, the technical solution of the embodiment of the present application can ensure electrical insulation and heat conduction in the battery 100 while improving the energy density of the battery 100, thereby improving the performance of the battery 100.

[0405] In some embodiments, the size T3 of the battery cell 20 in the first direction x and the size T5 of the heat conducting member 3a in the first direction x satisfy: 0 < T5 / T3 ≤ 7.

[0406] When T5 / T3 is too large, the heat conducting member 3a occupies a large space, affecting the energy density. In addition, if the heat conducting member conducts heat too quickly for the battery cell 20, safety problems may also occur. For example, when one battery cell 20 is thermally out of control, it may cause other battery cells 20 connected to the same heat conducting member to be thermally out of control. When 0 < T5 / T3 ≤ 7, the energy density of the battery 100 can be ensured and the safety performance of the battery 100 can be ensured.

[0407] In some embodiments, the dimension T3 of the battery cell 20 in the first direction x and the dimension T5 of the heat conducting member 3a in the first direction x may further satisfy 0 < T5 / T3 ≤ 1, so as to further improve the energy density of the battery 100 and ensure the safety performance of the battery 100.

[0408] In some alternative embodiments, the weight M1 of the battery cell 20 and the weight M2 of the heat conducting member 3a satisfy: 0 < M2 / M1 ≤ 20.

[0409] When M2 / M1 is too large, the weight energy density will be lost. When 0 < M2 / M1 ≤ 20, the weight energy density of the battery 100 can be ensured and the safety performance of the battery 100 can be ensured.

[0410] Optionally, in an embodiment of the present application, the weight M1 of the battery cell 20 and the weight M2 of the heat conducting member 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.

[0411] 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 walls 201 of a plurality of battery cells 20 in a row satisfy 0.2 ≤ S4 / S3 ≤ 30.

[0412] S4 is the total area of the side surface of the heat conducting member 3a connected to the battery cell 20. When S4 / S3 is too large, the energy density is affected. When S4 / S3 is too small, the heat conduction effect is too poor, affecting the safety performance. When 0.2 ≤ S4 / S3 ≤ 30, the energy density of the battery 100 can be ensured and the safety performance of the battery 100 can be ensured.

[0413] Optionally, S4 and S3 may further satisfy 2 ≤ S4 / S3 ≤ 10, so as to further improve the energy density of the battery 100 and ensure the safety performance of the battery 100.

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

[0415] When C / M2 < 0.02 KJ / (kg 2 *°C), the heat conducting member 3a will absorb more energy, causing the temperature of the battery cell 20 to be too low, and lithium plating may occur; when C / M2 > 100 KJ / (kg 2 *°C), the heat conduction ability of the heat conducting member 3a is poor and it cannot take away the heat in time. When 0.02 KJ / (kg 2 *°C) ≤ C / M2 ≤ 100 KJ / (kg 2When the temperature is *℃), the safety performance of the battery 100 can be ensured.

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

[0417] 0.3 KJ / (kg 2 *℃) ≤ C / M2 ≤ 20 KJ / (kg 2 *℃) to further improve the safety performance of the battery 100.

[0418] In some embodiments, the battery 100 may include a plurality of battery modules 100a. The battery module 100a may include at least one column of a plurality of battery cells 20 arranged along the second direction y and at least one heat conducting member 3a, and at least one column of battery cells 20 and at least one heat conducting member 3a are alternately arranged in the first direction x. That is to say, for each battery module 100a, the battery cell column and the heat conducting member 3a therein are alternately arranged in the first direction x. A plurality of battery modules 100 are accommodated in the box body 10 to form the battery 100.

[0419] Optionally, the battery module 100a includes two columns of battery cells 20, and one heat conducting member 3a is arranged between the two columns of battery cells 20. No heat conducting member 3a is arranged between adjacent battery modules 100a. In this way, fewer heat conducting members 3a can be arranged in the battery 100 in this embodiment, but at the same time, it can be ensured that each battery cell 20 can be connected to the heat conducting member 3a.

[0420] Optionally, a plurality of battery modules 100 are arranged in the first direction x, there is a gap between adjacent battery modules 100, and there is no heat conducting member 3a between adjacent battery modules 100, then the gap between adjacent battery modules 100a can provide an expansion space for the battery cells 20.

[0421] Optionally, a fixing structure 103 is arranged at the end of the heat conducting member 3a in the first direction x, and the heat conducting member 3a is fixed to the box body 10 through the fixing structure 103. As Figure 19 shown, the fixing structure 103 may include a fixing member 104. The fixing member 104 is fixedly connected to the end of the heat conducting member 3a and is connected to the battery cell 20 located at the end of the heat conducting member 3a, so as to enhance the fixing effect on the battery cell 20.

[0422] Optionally, in an embodiment of the present application, the heat conducting member 3a is bonded to the first wall 201. That is to say, the heat conducting member 3a and the battery cell 20 can be fixedly connected by bonding. For example, they are bonded by structural adhesive, but the embodiments of the present application are not limited thereto.

[0423] Optionally, the battery cell 20 can be adhesively fixed to the box body 11. Optionally, the adjacent battery cells 20 in each column of battery cells 20 can also be adhesively bonded. For example, the second walls 2112 of two adjacent battery cells 20 are adhesively bonded with structural adhesive, but the embodiments of the present application are not limited thereto. By adhesively fixing the adjacent battery cells 20 in each column of battery cells 20, the fixing effect of the battery cells 20 can be further enhanced.

[0424] Adopt the attached Figures 10 - 13 The battery cell 20 and the heat conducting member 3a shown in, where the number of battery cells 20 in one column of battery cells 20 is 2-20. According to GB38031-2020, the battery 10 is subjected to safety tests, and the test results are shown in Tables 4-7. It can be seen that the battery 100 of the embodiments of the present application can meet the safety performance requirements.

[0425] Table 4

[0426]

[0427]

[0428] Table 5

[0429] 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

[0430] Table 6

[0431] Number <![CDATA[S4 / mm 2 > <![CDATA[S3 / mm 2 > S4 / S3 Test Results 1 3120 21728 0.14 Fire, explosion 2 19500 38800 0.5 No fire, no explosion 3 65000 16800 3.87 No fire, no explosion 4 130000 16576 7.84 No fire, no explosion 5 216000 9600 22.5 No fire, no explosion 6 250000 7200 34.72 Fire, explosion

[0432] Table 7

[0433] 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

[0434] In some embodiments, as Figure 15 and Figure 35 shown, in the third direction z, the dimension H1 of the partition 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 parallel to the first wall. In this way, the space utilization rate inside the battery 100 can be further maximally improved, thereby improving the energy density of the battery 100.

[0435] In the third direction z, the dimension H1 of the partition 33 can be the height of the partition 33, 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.

[0436] When H1 / H2<0.1, the heat exchange area between the battery cell 20 and the partition 33 is small, and the battery cell 20 cannot be cooled or heated in time, making it difficult to meet the thermal management requirements of the battery.

[0437] When H1 / H2>2, although the thermal management requirements of the battery 100 can be met, the partition 33 occupies more space, wasting the space utilization in the third direction z, making it difficult to ensure the energy density requirements of the battery 100.

[0438] Alternatively, H1 / H2 may be 0.1, or 0.4, or 0.6, or 0.9, or 1.2, or 1.5, or 1.8, or 2, etc.

[0439] In some examples, the partition 33 is a thermal management component 3 b , which is used to adjust the temperature of the battery cell 20 . The height of the thermal management component 3 b in the third direction z is H1 .

[0440] Optionally, the thermal management component 3 b may be a water cooling plate, which is used to cool the battery cells 20 during fast charging or to heat the battery cells 20 when the temperature is too low.

[0441] Optionally, the thermal management component 3b may be made of a material with good thermal conductivity, such as metal materials such as aluminum.

[0442] In some embodiments, the dimension H1 of the partition 33 and the dimension H2 of the first wall 201 further satisfy: 0.3≤H1 / H2≤1.3. In this way, the temperature of the battery cell 20 can be guaranteed not to exceed 55°C during fast charging.

[0443] Optionally, H1 / H2 can be 0.3, or 0.5, or 0.8, or 1.0, or 1.1, or 1.3, etc.

[0444] Optionally, in one embodiment of the present application, the heat exchange area between the first wall 201 and the partition is S, and the relationship between the capacity Q of the battery cell 20 and the heat exchange area S satisfies: 0.03Ah / cm 2 ≤Q / S≤6.66Ah / cm 2 .

[0445] The heat exchange area S may be the contact area between the first wall 201 and the partition 33 , and the heat exchange area S satisfies: S=H1*L, where L is the size of each battery cell 20 along the second direction y.

[0446] When Q / S<0.03Ah / cm 2 When , the heat exchange area S is large enough to meet the thermal management requirements of the battery, but at this time the space occupied by the partition 33 is too large to meet the energy density requirements of the battery 100.

[0447] When Q / S>6.66Ah / cm 2 When the heat exchange area S is small, the heat of the battery cell 20 cannot be discharged through the partition 33 in time, and the battery cell 20 cannot be cooled quickly in time, which makes it difficult to meet the thermal management requirements.

[0448] 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 of the battery, especially during the fast charging process; in addition, when the capacity Q of the battery cell 20 is fixed, the heat management requirements of the battery can be flexibly met by adjusting the heat exchange area S.

[0449] In a possible implementation manner, the size H1 of the partition plate 33 is 1.5 cm to 30 cm. In this way, it can be ensured that the temperature of the battery cell 20 does not exceed 55 °C during the fast charging process of the battery.

[0450] The battery is subjected to a charging test, and the test results are shown in Table 8.

[0451] Table 8 Temperature test during the charging process of battery cells and thermal management components of different specifications

[0452]

[0453]

[0454] In some embodiments, such as Figure 12 and Figure 32 as shown, a cavity 30a is provided inside the partition plate 33.

[0455] In this way, the partition plate 33 provided with the cavity structure has the ability to absorb deformation, can absorb the expansion deformation amount of the battery cell 20, and improve the performance of the battery 100; in other words, the cavity 30a can enable the partition plate 33 to have a large compression space in the first direction x, so as to provide a large expansion space for the battery cell 20.

[0456] In addition, the cavity 30a can reduce the weight of the partition plate while ensuring the strength of the partition plate 101. For example, it can be applied to the case where the thickness of the partition plate 33 is relatively large.

[0457] Optionally, the cavity 30a can be used to accommodate a heat exchange medium to adjust the temperature of the battery cell 20, so that the temperature of the battery cell 20 can be conveniently adjusted within a suitable range at any time, improving the stability and safety of the battery cell 20. It can be seen that at this time, the cavity 30a can also be referred to as a heat exchange cavity, and the cavity 30a corresponds to one or more flow channels 30c for accommodating the heat exchange medium.

[0458] It should be understood that the fluid mentioned here can be a liquid that can adjust the temperature and does not chemically react with the material of the cavity 30a, such as water, and the present application does not make any limitations in this regard.

[0459] In some embodiments, such as Figure 12 and Figure 32As shown, in the first direction x, the dimension of the cavity 30a is W, and the capacity Q of the battery cell 20 and the dimension W of the cavity 30a satisfy: 1.0 Ah / mm ≤ Q / W ≤ 400 Ah / mm. The first direction x is perpendicular to the first wall 201, so as to effectively utilize the partition 33 to prevent heat diffusion between the battery cells 20. By quickly cooling and reducing the temperature of the battery cell 20 with too high temperature, the heat of this battery cell 20 can be prevented from spreading and transferring to the adjacent battery cells 20, thus causing the temperature of the adjacent battery cells 20 to be too high.

[0460] When Q / W > 400 Ah / mm, at this time the dimension W of the cavity 30a is small, and the volume of the fluid that can be accommodated or flow through in the cavity 30a is small, and the battery cell 20 cannot be cooled in time. In this way, when the temperature of a certain battery cell 20 is too high, due to the failure to cool this battery cell 20 in time, the heat of this battery cell 20 spreads to the adjacent battery cells 20, resulting in the temperature of the adjacent battery cells 20 being too high and abnormal, affecting the performance of the entire battery 10.

[0461] When Q / W < 1.0 Ah / mm, at this time the dimension W of the cavity 30a is large, and the volume of the fluid that can be accommodated or flow through in the cavity 104 is large, and the battery cell 20 can be fully cooled. However, the large dimension of the cavity 30a results in a large occupied space of the partition 33, and the energy density of the battery 100 cannot be guaranteed. At the same time, the partition 33 with too large a volume also leads to an increase in cost.

[0462] The cavity 30a can be formed by a pair of heat conducting plates 333 in the partition 33. The dimension W of the cavity 30a in the first direction x can be the distance in the first direction x between the inner walls of the two heat conducting plates 333. The larger the dimension W of the cavity 30a, the larger the volume of the cavity 30a, and the larger the volume of the fluid that can be accommodated or flow through in the cavity 30a. Therefore, the heat transfer between the battery cell 20 and the partition 33 is faster. For example, when the partition 33 is a water cooling plate, the larger the dimension W of the cavity 30a, the faster the heat of the battery cell 20 is dissipated, and thus the cooling of the battery cell 20 is faster, and the heat of the battery cell 20 can be prevented from spreading to the adjacent battery cells 20. Optionally, the fluid can flow cyclically to achieve a better temperature regulation effect. Optionally, the fluid can be water, a mixture of water and ethanol, a refrigerant, or air, etc.

[0463] Figure 36 It is a schematic structural diagram of the connection between the battery cell and the thermal management component according to an embodiment of the present application. Figure 37 is Figure 36 the cross-sectional view along the A-A direction in Figure 38 is Figure 37 the enlarged schematic view of the G area in Figures 36 to 38, the dimension T3 of the battery cell 20 in the first direction x and the dimension H of the thermal management component 3b in the third direction satisfy: 0.03 ≤ T3 / H ≤ 5.5, and the third direction is perpendicular to the first direction and the second direction.

[0464] The dimension T3 of the battery cell 20 in 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.

[0465] The dimension H1 of the partition 33 in the third direction can be the height H of the thermal management component 3b in the third direction. The larger the H, the larger the volume of the thermal management component 3b, the larger the occupied space, and at the same time the stronger the thermal management ability. For example, when the thermal management component 3b is a water-cooled plate, the larger the H, the stronger the cooling ability for the battery cell 20, and the more effectively it can prevent the heat of the battery cell 20 from spreading to the adjacent battery cell 20.

[0466] When T3 / H < 0.03, the dimension H of the thermal management component 3b in the third direction is relatively large, which can fully meet the requirement of preventing the heat of the battery cell 20 from spreading, but it is difficult to meet the requirement of the energy density of the battery 100. At the same time, the larger volume of the thermal management component 3b will also lead to an increase in production cost.

[0467] When T3 / H > 5.5, at this time the thermal management component 3b is difficult to meet the thermal management requirements for the battery cell 20, that is, it cannot timely export the heat of the battery cell 20, resulting in the spread of this heat to the adjacent battery cell 20, causing abnormal temperatures of other battery cells 20, and further affecting the performance of the battery 100.

[0468] In some embodiments, the dimension H1 of the partition 33 in the third direction is 15 mm to 300 mm. In this way, the partition 33 can balance the requirements of strength and thermal management performance.

[0469] In some embodiments, the dimension W of the cavity 30a is 0.8 mm to 50 mm. In this way, the requirements of strength and thermal management performance can be balanced.

[0470] Next, a combination of two rows of battery cells 20 and two partitions 33 is used to conduct a thermal diffusion test on the battery 100 according to GB38031-2020, and the test results are shown in Table 9.

[0471] Table 9 Thermal diffusion test of battery cells and partitions of different specifications

[0472]

[0473]

[0474] In some embodiments, such as Figure 32 ,Figure 33 and Figure 38 As shown in Figure 38 , the partition 33 further includes a pair of heat-conducting plates 333 disposed opposite to each other in the first direction, and the cavity 30a is disposed between the pair of heat-conducting plates 333. The first direction is perpendicular to the first wall 201.

[0475] For example, each heat-conducting plate 333 extends in the second direction, and the two heat-conducting plates 333 are opposite to each other in the first direction, so as to form a cavity 30a between the two heat-conducting plates 333. The cavity 30a can be used as a flow channel for the heat exchange medium, so that the partition 33 is formed into a heat-conducting member 3a or a heat management component 3b.

[0476] In some embodiments, as Figure 32 shown, the size D of the heat-conducting plate 333 in the first direction x is 0.1 mm to 5 mm.

[0477] When the size D of the heat-conducting plate 333 in the first direction is too small, with a certain internal space of the partition 33, the cavity 30a occupies most of the space of the partition 33. In this case, the stiffness of the partition 33 is very poor and cannot effectively improve the structural strength of the battery 10. When the size D of the heat-conducting plate 333 in the first direction is too large, the cavity 30a inside the partition 33 is very small and can hold very little fluid, and cannot effectively regulate the temperature of the battery cell 20. Therefore, the value of D is set to 0.1 mm to 5 mm.

[0478] Optionally, the sizes D of the pair of heat-conducting plates 333 of the partition 333 in the first direction can be the same or different.

[0479] Optionally, the two heat-conducting plates 333 can be made of a material with good heat-conducting performance, such as a metal material like aluminum.

[0480] In some embodiments, as Figure 33 and Figure 38 shown, the partition 33 further includes a reinforcing rib 334. The reinforcing rib 334 is disposed between the pair of heat-conducting plates 33 to enhance the structural strength of the partition 33.

[0481] Optionally, the number of the reinforcing ribs 334 is one. In this way, one or more cavities 30a can be formed between the pair of heat-conducting plates 333.

[0482] Optionally, when the number of the cavities 30a is multiple, different cavities 30a can be independent of each other or communicated through an adapter

[0483] When the reinforcing rib 334 is connected to only one of a pair of heat conducting plates 333, the reinforcing rib 334 is a cantilever with one end connected to the heat conducting plate 333. At this time, the cavity 30a can correspond to a flow channel 30c. When the reinforcing rib 334 is connected to a pair of heat conducting plates 333 respectively, the cavity 30a can correspond to multiple flow channels 30c. The number of the reinforcing ribs 334 can be specifically set according to requirements, and the embodiments of the present application do not limit this.

[0484] In some embodiments, as Figure 33 and Figure 45 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 plate 333.

[0485] Optionally, as Figure 33 shown, the reinforcing rib 334 can be provided only on one heat conducting plate 333, or the reinforcing rib 334 can also be provided between a pair of heat conducting plates 333 and connected to the pair of heat conducting plates 333.

[0486] Optionally, as Figure 33 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 plate 333 can be an acute angle to provide more expansion space for the battery cell 20; as Figure 33 shown, when the reinforcing rib 334 is connected to one heat conducting plate 333, the included angle between the reinforcing rib 334 and the heat conducting plate 333 can also be a right angle, so that the partition plate can bear a greater pressure.

[0487] Optionally, the reinforcing rib 334 can be of special shapes, such as C-shaped, wavy or cross-shaped, etc., which can effectively absorb expansion and can also increase flow disturbance to enhance the heat exchange effect.

[0488] In some embodiments, as Figure 45 shown, the reinforcing rib 334 includes a first reinforcing rib 3341. Both ends of the first reinforcing rib 3341 are respectively connected to a pair of heat conducting plates 333. The first reinforcing rib 3341 is used to support the pair of heat conducting plates 333. When the partition plate 333 deforms to absorb the expansion force of the battery cell 20, the first reinforcing rib 3341 can deform to adapt to at least part of the pair of heat conducting plates 333 moving in a direction close to each other along the first direction x.

[0489] Wherein, the first reinforcing rib 3341 is inclined with respect to the first direction x, then the included angle between the first reinforcing rib 3341 and one of the pair of heat conducting plates 333 is less than 90°, which can improve the bending property of the first reinforcing rib 3341, can better deform to meet the requirement of the partition plate 33 for absorbing the expansion force, and avoid the risk of small deformation space and easy fracture and failure due to a straight shape.

[0490] Optionally, there may be one or more first reinforcing ribs 3341, and multiple first reinforcing ribs 3341 may be arranged at intervals along the third direction z; wherein, the interval dimensions between two adjacent first reinforcing ribs 3341 may be the same or different.

[0491] Optionally, the material of the first reinforcing rib 3341 may be made of a reinforcing rib structure, which can achieve the lightweight design of the partition 333 while ensuring the supporting effect, thereby realizing the overall lightweight design of the battery 100.

[0492] 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 supporting strength.

[0493] Optionally, the first reinforcing rib 3341 is in the shape of a plate-like structure so that it can deform better to meet the requirement of the partition for absorbing the expansion force of the battery cell 20; moreover, it is beneficial to production and processing and improves the production efficiency.

[0494] In some embodiments, as Figure 45 shown, the included angle range between the first reinforcing rib 3341 and the first direction x is 30° - 60°, then the included angle range between the first reinforcing rib 3341 and one of the pair of heat conducting plates 333 is 30° - 60°, which is beneficial to better deformation while meeting the supporting requirements and is not easy to break.

[0495] Optionally, when there are multiple first reinforcing ribs 3341, the inclination directions of two adjacent first reinforcing ribs 3341 may be the same or different.

[0496] In some embodiments, as Figure 45 shown, the reinforcing rib 334 further 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 arranged at an interval 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 less than the distance between the pair of heat conducting plates 333.

[0497] Thus, by providing the above-mentioned second reinforcing rib 3342, it can not only cooperate with the first reinforcing rib 3341 to achieve a better supporting effect, but 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 contacts the other, the deformation of the partition 33 can be further restricted, avoiding the blockage of the flow channel 30c corresponding to the cavity 30a and ensuring the effectiveness of the flow channel 30c, thereby ensuring the effectiveness of the partition 33.

[0498] Optionally, a 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 disposed on the first heat conducting plate 3331 or on the second heat conducting plate 3332. Exemplarily, both the first heat conducting plate 3331 and the second heat conducting plate 3332 are provided with the second reinforcing rib 3342.

[0499] In some embodiments, as Figure 45 shown, in the third direction z, a second reinforcing rib 3342 is disposed between every two adjacent first reinforcing ribs 3341. Optionally, one of every 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 uniform stress on the first heat conducting plate 3331 and the second heat conducting plate 3332, and at the same time, they do not bear too much weight.

[0500] In some embodiments, as Figure 45 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.

[0501] Optionally, the second reinforcing rib 3342 is in the shape of a prism with multiple lateral faces, so that the second reinforcing rib 3342 has a sufficient cross-sectional area. When the partition 33 deforms due to the expansion force of the battery cell 20 and the second reinforcing rib 3342 disposed on one of the pair of heat conducting plates 333 contacts the other, the second reinforcing rib 3342 can have a sufficient contact area, so as to better improve the supporting ability and avoid damage or even failure of the second reinforcing rib 3342, resulting in contact between the two heat conducting plates 333, thereby ensuring the effectiveness of the partition 33.

[0502] In some embodiments, as Figure 45 shown, the first reinforcing rib 3341 and the second reinforcing rib 3342 are disposed at intervals to ensure relatively uniform stress on the two heat conducting plates 333.

[0503] In some embodiments, along the third direction z (for example, the height direction of the box body 10), the first reinforcing rib 3341 and the second reinforcing rib 3342 are alternately distributed. For example, every two adjacent first reinforcing ribs 3341 and second reinforcing ribs 3342 can be alternately disposed 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 set according to a certain arrangement rule.

[0504] Exemplarily, in the third direction z, one of every 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 uniform stress on the first heat conducting plate 3331 and the second heat conducting plate 3332, and at the same time, they do not bear too much weight.

[0505] By setting in this way, not only can the uniformity of the supporting effect on the two heat conducting plates 333 be ensured, but also each part of the flow channel 30c corresponding to the cavity 30a in the second direction y will not be blocked, which can well ensure the effectiveness of the flow channel 30c.

[0506] In some embodiments, such as Figure 32 and Figure 45 shown, in the first direction x, the thickness D of the heat conducting plate 333 and the size W of the cavity satisfy: 0.01 ≤ D / W ≤ 25, so as to take into account the requirements of both strength and thermal management performance.

[0507] Specifically, when the size W of the cavity 30a is relatively large, the flow resistance of the fluid in the cavity 30a is low, and the heat exchange amount per unit time of the partition 33 can be increased; when the thickness D of the heat conducting plate 333 is relatively large, the strength of the partition 33 is high. When D / W is less than 0.01, the size W of the cavity 30a is large enough, but the occupied space is too large; or in the space of the established partition 33, the thickness D of the heat conducting plate 333 may be too thin, resulting in insufficient strength. For example, it cannot meet the vibration and shock requirements of the battery 20, and even the partition 33 may be crushed when the battery pack is initially formed. When D / W ≥ 25, the thickness D of the heat conducting plate 333 is thick enough, but in the space of the established partition 33, the size W of the cavity 30a may be too small, the flow resistance of the fluid in the cavity 30a increases, the heat exchange performance deteriorates or the cavity 30a is blocked during use; at the same time, due to the too large 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 partition 33 corresponding to the expansion space required by the battery cell 20, that is, the partition 33 cannot timely make way for the expansion space required by the battery cell 20, which will accelerate the capacity decline 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, the requirements of both strength and thermal management performance can be taken into account, and the performance of the battery 100 can be guaranteed.

[0508] Optionally, when 0.01 ≤ D / W ≤ 0.1, the fluid can adopt a solid-liquid phase change material or a liquid working medium. The outer layer of the partition 33 can be a film-like material as the skin, and the inside can be filled with a skeleton structure for reinforcement. This solution can be used in cases where the strength requirement is relatively low or the compressibility requirement of the partition 33 is relatively high.

[0509] Optionally, when in the range of 0.1 ≤ D / W ≤ 1, the inside of the partition 33 can adopt a fluid working medium for convective heat exchange or a vapor-liquid phase change cooling solution, and a liquid working medium is used as the heat exchange medium to ensure the heat exchange performance of the partition 33.

[0510] Optionally, when 1≤D / W≤25, the partition 33 can adopt a vapor-liquid phase change cooling solution. 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 caused by pressure loss and providing heat transfer 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 vaporization pressure of the internal working fluid during heating.

[0511] 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 more preferably 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.

[0512] Optionally, the size T1 of the partition 33 in the first direction x is 0.3 mm to 100 mm.

[0513] T1 is the total thickness of the partition 33, that is, T1 = 2*D + W. If T1 is too large, it will result in occupying too much space. If T1 is too small, it will result in too low strength or the cavity 30a being too narrow, affecting the thermal management performance. Therefore, when the total thickness T1 of the partition 33 is 0.3 mm to 100 mm, space, strength, and thermal management can be balanced to ensure the performance of the battery 100.

[0514] Optionally, the thickness D of the heat conducting plate 333 is 0.1 mm to 25 mm.

[0515] If the thickness D of the heat conducting plate 333 is too large, it will result in occupying too much space and the partition 33 being unable to timely provide the expansion space required by the battery cell 20. If D is too small, it will result in too low strength. Therefore, when the thickness D of the heat conducting plate 333 is 0.1 mm to 25 mm, space, strength, and the expansion requirements of the battery cell 20 can be balanced to ensure the performance of the battery 100.

[0516] Optionally, the size W of the cavity 30a in the first direction is 0.1 mm to 50 mm.

[0517] Specifically, the size W of the cavity 30a needs to be at least larger than the size of the impurity particles that may appear inside to avoid blockage during application. Moreover, if the size W of the cavity 30a is too small, the flow resistance of the fluid in the cavity 30a increases, and the heat transfer performance deteriorates. Therefore, the size W of the cavity 30a is not less than 0.1 mm. If the size W of the cavity 30a is too large, it will result in occupying too much space or insufficient strength. Therefore, when the size W of the cavity 30a is 0.1 mm to 50 mm, space, strength, and thermal management performance can be balanced to ensure the performance of the battery 100.

[0518] Optionally, the size T1 of the partition 33 in the first direction x and the area S3 of the first wall 201 satisfy: 0.03 mm -10.03mm ≤ T1 / S3 * 1000 ≤ 2mm -1 。

[0519] When T1 and S3 meet the above conditions, the heat transfer performance requirements and dimensional space requirements of the battery cell 20 can be satisfied. Specifically, when the area S3 of the first wall 201 of the battery cell 20 is relatively large, the cooling area is relatively large, and the heat transfer resistance from the separator 33 to the surface of the battery cell 20 can be reduced; when the total thickness T1 of the separator 33 is relatively large, the strength can be improved. If T1 / S3 * 1000 is less than 0.03mm -1 ,although the area S3 of the first wall 201 of the battery cell 20 is large enough, the separator 33 is too thin, resulting in insufficient strength, and the separator 33 may be damaged or cracked during use. If T1 / S3 * 1000 is greater than 2mm -1 ,the separator 33 is thick enough, but the area S3 of the first wall 201 of the battery cell 20 is too small, and the cooling surface that the separator 33 can supply to the battery cell 20 is insufficient, and there is a risk of not meeting the heat dissipation requirements of the battery cell 20. Therefore, when the total thickness T1 of the separator 33 and the area S3 of the first wall 201 satisfy 0.03mm -1 ≤ T1 / S3 * 1000 ≤ 2mm -1 ,the strength and heat management performance requirements can be taken into account simultaneously, and the performance of the battery 100 can be guaranteed.

[0520] Optionally, the separator 33 further includes a reinforcing rib 334. The reinforcing rib 334 is disposed between a pair of heat conducting plates 333, and 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, and the unit is Mpa. That is to say, the minimum thickness X of the reinforcing rib 334 can be (-0.0005 * F + 0.4738)mm.

[0521] The thickness X of the reinforcing rib 334 is related to the tensile strength of its material. According to the above relationship, in order to meet the force requirements of the separator 33, the higher the strength of the selected material, the thinner the thickness X of the internal reinforcing rib 334 can be, thereby saving space and increasing the energy density. Optionally, the thickness X of the reinforcing rib 334 can be 0.2mm to 1mm.

[0522] Using the battery cell 20 and the separator 33 shown in Figure 45 ,simulation tests on the heating rate and the deformation force of the separator 33 are carried out, and the test results are shown in Table 10. In Table 10, L is the dimension of the battery cell 20 in the second direction y, T3 is the dimension of the battery cell 20 in the first direction x, and H2 is the dimension of the first wall 201 of the battery cell 20 in the third direction z, and the third direction is perpendicular to the first direction x and the second direction y.

[0523] Table 10

[0524]

[0525]

[0526] In some embodiments, such as Figure 47 , Figure 48 , Figure 50 and Figure 51 shown, the partition 33 is provided with a medium inlet 3412 and a medium outlet 3422, and the cavity 30a communicates with the medium inlet 3412 and the medium outlet 3422, so that the cavity 30a can accommodate a heat exchange medium to adjust the temperature of the battery cell 20; a cavity 30b is provided inside the partition 33 and 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, while playing a role in adjusting the temperature of the battery cell 20, the weight of the partition 33 can be reduced, so that the weight reduction of the partition 33 can be realized, and during use, the phenomenon that the heat exchange medium enters the cavity 30b and causes the weight of the partition 33 to increase can be alleviated, and further, the weight of the battery 100 having such a partition 33 can be effectively reduced, which is beneficial to improving the energy density of the battery 100 and improving the performance of the battery 100.

[0527] For example, the medium inlet 3412 and the medium outlet 3422 are respectively arranged at both ends of the partition 33, and the cavity 30a and the cavity 30b are both arranged inside the partition 33. The cavity 30a communicates with the medium inlet 3412 and the medium outlet 3422, that is, both ends of the cavity 30a are respectively communicated with the medium inlet 3412 and the medium outlet 3422, so that the fluid medium can flow into or out of the cavity 30a. The cavity 30b is disconnected from both the medium inlet 3412 and the medium outlet 3422, that is, the cavity 30b does not form a communication relationship with the medium inlet 3412 and the medium outlet 3422, so that the fluid medium cannot enter the cavity 30b.

[0528] It should be noted that the cavity 30b provided inside the partition 33 can be one or more, and similarly, the cavity 30a provided inside the partition 33 can be one or more; when there are multiple cavities 30a, each cavity 30a communicates with the medium inlet 3412 and the medium outlet 3422, that is, both ends of the multiple cavities 30a are respectively communicated with the medium inlet 3412 and the medium outlet 3422. Exemplarily, in the embodiments of the present application, both the cavity 30a and the cavity 30b provided inside the partition 33 are multiple.

[0529] In some embodiments, referring to Figure 47 and Figure 48, the partition 33 includes a main body plate 331 (or referred to as the main body part), a first current collector 341, and a second current collector 342. The main body plate 331 is provided with a cavity 30a and a chamber 30b. Along the length direction of the main body plate 331 (i.e., the second direction y), the first current collector 341 and the second current collector 342 are respectively arranged at both ends of the main body plate 331, and a medium inlet 3412 and a medium outlet 3422 are respectively arranged on the first current collector 341 and the second current collector 342.

[0530] Among them, both the cavity 30a and the chamber 30b are arranged inside the main body plate 331. Exemplarily, in Figure 48 , both the cavity 30a and the chamber 30b extend along the length direction of the main body plate 331, and both ends of the cavity 30a penetrate through both ends of the main body plate 331, so that the cavity 30a can communicate with the medium inlet 3412 of the first current collector 341 and the medium outlet 3422 of the second current collector 342.

[0531] It should be noted that the main body plate 331, the first current collector 341, and the second current collector 342 can be an integral structure or a split structure. When the main body plate 331, the first current collector 341, and the second current collector 342 are of an integral structure, the main body plate 331, the first current collector 341, and the second current collector 342 can be made by casting or injection molding processes. When the main body plate 331, the first current collector 341, and the second current collector 342 are of a split structure, the first current collector 341 and the second current collector 342 can be connected to both ends of the main body plate 331 by means such as bolt screwing, clamping, or bonding.

[0532] In some embodiments, as Figures 48 - 51 shown, a channel 3151 is arranged inside the main body plate 331, and the channel 3151 penetrates through both ends of the main body plate 331 in the length direction of the main body plate 331. The partition 33 further includes a plugging member 318, and the plugging member 318 is connected to the main body plate 331. The plugging member 318 plugs both ends of the channel 3151 to form the chamber 30b.

[0533] Among them, along the length direction of the main body plate 331, plugging members 318 are arranged at both ends where the channel 3151 penetrates through the main body plate 331. After plugging both ends of the channel 3151 by the plugging members 318, a sealed chamber 30b can be formed, so as to disconnect the chamber 30b from both the medium inlet 3412 and the medium outlet 3422.

[0534] Exemplarily, the plugging member 318 can be a metal sheet, a rubber plug or a silica gel plug, etc. During the actual production process, different plugging members 318 can be adopted according to the size of the channel 3151. For example, when the channel 3151 is relatively large, the metal sheet can be welded to one end of the main body plate 331 to plug the channel 3151, or a rubber plug or a silica gel plug can be used to plug the channel 3151. When the channel 3151 is relatively small, it is difficult to weld the metal sheet, and a rubber plug or a silica gel plug can be used to be stuck in the channel 3151 to achieve the plugging effect on the channel 3151.

[0535] In some embodiments, as shown in Figures 48 - 51 the plugging member 318 is detachably connected to the main body plate 331. By connecting the plugging member 318 to the main body plate 331 in a detachable manner, the plugging member 318 can be quickly disassembled and replaced. On the one hand, it is convenient to plug different channels 3151 according to actual needs during use to meet different use requirements. On the other hand, the plugging member 318 can be repaired and replaced, which is beneficial to improving the service life of the partition plate 33.

[0536] Exemplarily, the plugging member 318 is clamped at one end of the channel 3151 to achieve plugging of the channel 3151. Of course, in other embodiments, the plugging member 318 can also be detachably connected to the main body plate 331 by means of bolt screwing or buckling, etc.

[0537] It should be noted that in Figures 48 - 51 the cavity 30b is a sealed structure formed by the plugging member 318 plugging the channel 3151 inside the main body plate 331. In other embodiments, as shown in Figure 50 the cavity 30b can also be a structure integrally formed by the main body plate 331. That is to say, the cavity 30b is a structure with a cavity inside formed by the main body plate 331 through processes such as casting or stamping, that is, the plugging member 318 and the main body plate 331 are of an integral structure.

[0538] The channel 3151 running through both ends of the main body plate 331 in the length direction of the main body plate 331 is formed inside the main body plate 331, and by arranging the plugging member 318 on the main body plate 331, the plugging member 318 plugs both ends of the channel 3151, thereby forming the cavity 30b that is disconnected from both the medium inlet 3412 and the medium outlet 3422. The structure is simple, convenient for manufacturing and processing, and can plug different channels 3151 according to actual needs to expand the application range of the partition plate 33.

[0539] In some embodiments, a first chamber communicating with the medium inlet 3412 is formed inside the first manifold 341, a second chamber communicating with the medium outlet 3422 is formed inside the second manifold 342, and the flow channel 30c penetrates 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.

[0540] Among them, a first chamber communicating with the medium inlet 3412 is formed inside the first manifold 341, that is, a first chamber is formed inside the first manifold 341, and the medium inlet 3412 penetrates through the chamber 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 through one end of the main body plate 331 can communicate with the first chamber inside the first manifold 341, so that multiple flow channels 30c are all communicated with the first chamber of the first manifold 341 to realize the communication between the multiple flow channels 30c and the medium inlet 3412.

[0541] Similarly, a second chamber communicating with the medium outlet 3422 is formed inside the second manifold 342, that is, a second chamber is formed inside the second manifold 342, and the medium outlet 3422 penetrates through the chamber 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 through one end of the main body plate 331 can communicate with the second chamber inside the second manifold 342, so that multiple flow channels 30c are all communicated with the second chamber of the second manifold 342 to realize the communication between the multiple flow channels 30c and the medium outlet 3422.

[0542] It should be noted that the cavity 30b is not communicated with the first chamber of the first manifold 341 and the second chamber of the second manifold 342, so that the cavity 30b is disconnected from both the medium inlet 3412 and the medium outlet 3422.

[0543] 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, so that the flow channel 30c can communicate with both the first chamber and the second chamber after penetrating through both ends of the main body plate 331, so as to realize the communication between the flow channel 30c and both the medium inlet 3412 and the medium outlet 3422, so that during use, it is possible to inject a fluid medium into multiple flow channels 30c through the medium inlet 3412 and the medium outlet 3422 at the same time to improve the use efficiency.

[0544] In some embodiments, as shown in Figure 47 and Figure 48 The cavity 30b and the cavity 30a both extend along the length direction of the main body plate 331 and are arranged along the width direction of the main body plate 331 (i.e., the third direction z).

[0545] Among them, the partition plate 33 is provided with a cavity 30a and a plurality of cavities 30b. The cavity 30a corresponds to a plurality of flow channels 30c. The cavities 30b and the flow channels 30c both extend along the length direction of the main body plate 331, and the plurality of cavities 30b and the plurality of flow channels 30c are both arranged along the width direction of the main body plate 331. The arrangement manners of the plurality of cavities 30b and the plurality of flow channels 30c can be various. For example, the cavities 30b and the flow channels 30c can be arranged alternately, or along the width direction of the main body plate 331, the plurality of cavities 30b are located on one side of the plurality of flow channels 30c, or along the width direction of the main body plate 331, a plurality of cavities 30b are arranged at the middle position of the main body plate 331, and flow channels 30c are arranged on both sides of the plurality of cavities 30b. Exemplarily, in Figure 48 along the width direction of the main body plate 331, two flow channels 30c are arranged at the middle position of the main body plate 331, and three cavities 30b are respectively arranged on both sides of the two flow channels 30c, and one flow channel 30c is arranged at both ends of the main body plate 331.

[0546] The cavities 30b and the flow channels 30c both extend along the length direction of the main body plate 331 and are arranged along the width direction of the main body plate 331, so as to facilitate the processing and manufacturing of the cavities 30b and the flow channels 30c, and facilitate the optimization of the arrangement positions of the flow channels 30c, and further is beneficial to improving the temperature regulation ability of the partition plate 33 for the battery 100.

[0547] In some embodiments, referring to Figure 48 and Figure 49 as shown, along the width direction of the main body plate 331, a flow channel 30c is arranged at the middle position of the main body plate 331.

[0548] Among them, a flow channel 30c is arranged at the middle position of the main body plate 331. If there is one flow channel 30c, the flow channel 30c is arranged at the middle position of the main body plate 331. If there are a plurality of flow channels 30c, at least part of the flow channels 30c among the plurality of flow channels 30c are located at the middle position of the main body plate 331 in the width direction of the main body plate 331. Exemplarily, in Figure 48 and Figure 49 along the width direction of the main body plate 1, two flow channels 30c are arranged at the middle position of the main body plate 331. Of course, in other embodiments, along the width direction of the main body plate 331, one, three, four or the like of flow channels 30c can also be arranged at the middle position of the main body plate 331.

[0549] A flow channel 30c is arranged at the middle position of the main body plate 331 in its width direction, so as to be able to perform heat exchange on the place where the heat inside the battery 100 is relatively concentrated, which is beneficial to improving the thermal management performance of the partition plate 33 for the battery 100.

[0550] In some embodiments, referring to Figure 51 ,Figure 51 A cross-sectional view of the main body plate 331 of the partition plate 33 provided in some other embodiments of the present application. The partition plate 33 is provided with a plurality of flow channels 30c and a plurality of cavities 30b. Along the width direction of the main body plate 331, the cavities 30b and the flow channels 30c are arranged alternately.

[0551] Among them, the cavities 30b and the flow channels 30c are arranged alternately, that is, the cavities 30b and the flow channels 30c are arranged alternately in sequence along the width direction of the main body plate 331. That is to say, 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.

[0552] The cavities 30b and the flow channels 30c are arranged alternately along the width direction of the main body plate 331. That is to say, both the cavities 30b and the flow channels 30c are multiple, and the cavities 30b and the flow channels 30c are arranged alternately with each other to achieve the dispersed arrangement of the flow channels 30c along the width direction of the main body plate 331, so as to effectively reduce the phenomenon of uneven heat exchange capacity of the partition plate 33 caused by the concentration of the flow channels 30c, and further facilitate the improvement of the service performance of the partition plate 33.

[0553] In some embodiments, referring to Figure 49 as shown, along the thickness direction of the main body plate 331 (i.e., the first direction x), the main body plate 331 has two opposite side surfaces 3312. The area of one side surface 3312 is S5, and the total projected area of the flow channels 30c on the side surface 3312 is S6, satisfying S6 / S5≥0.2.

[0554] Among them, the area of one side surface 3312 is S5, and the total projected area of the flow channels 30c on the side surface 3312 is S6, S6 / S5≥0.2, that is, the total area occupied by the multiple flow channels 30c on the side surface 3312 of the main body plate 331 is greater than or equal to 20%.

[0555] By making the area occupied by the multiple flow channels 30c on the side surface 3312 of the main body plate 331 greater than or equal to 20%, the phenomenon of poor heat exchange capacity caused by too little area occupied by the flow channels 30c can be reduced, and thus the heat exchange performance of the partition plate 33 can be ensured.

[0556] In some embodiments, referring to Figure 46 and Figure 47As shown, the cavities 30a of multiple partitions 33 are connected in series with each other, that is, the medium inlet 3412 of one partition 33 is communicated with the medium outlet 3422 of another partition 33. Of course, the flow channels 30c of multiple partitions 33 can also be connected in parallel with each other, that is, the medium inlets 3412 of multiple partitions 33 are communicated with each other, and the medium outlets 3422 of multiple partitions 33 are communicated with each other. The battery 100 is provided with multiple partitions 33, such that in such a battery 100, it is beneficial to improve the thermal management ability of the partitions 33 for the battery cells 20, so as to reduce the safety hazards brought by the internal temperature rise of the battery 100.

[0557] In some embodiments, referring to Figure 46 and Figure 47 as shown, the medium outlet 3422 of one partition 33 is communicated with the medium inlet 3412 of another partition 33.

[0558] Among them, the structure in which the medium outlet 3422 of one partition 33 is communicated with the medium inlet 3412 of another partition 33 can be various. It can be that the medium outlet 3422 of one partition 33 is connected to the medium inlet 3412 of another partition 33, or can be communicated through other components, such as a connecting pipe, etc., to realize the series structure of multiple partitions 33.

[0559] By communicating the medium outlet 3422 of one partition 33 among multiple partitions 33 with the medium inlet 3412 of another partition 33, the series structure of multiple partitions 33 is realized, so as to facilitate assembly and processing, and during use, it is convenient to inject fluid medium into the flow channels 30c of multiple partitions 33.

[0560] In some embodiments, the partition 33 is provided with multiple flow channels 30c. Along the flow direction of the fluid medium in the flow channels 30c of multiple partitions 33, among two adjacent partitions 33, the number of flow channels 30c of the partition 33 located downstream is greater than the number of flow channels 30c of the partition 33 located upstream.

[0561] Among them, along the flow direction of the fluid medium in the flow channels 30c of multiple partitions 33, that is, the direction when the fluid medium flows through the flow channels 30c of multiple partitions 33. Among two adjacent partitions 33, the number of flow channels 30c of the partition 33 located downstream is greater than the number of flow channels 30c of the partition 33 located upstream. That is, in the flow direction of the fluid medium, among two adjacent partitions 33, the partition 33 that the fluid medium passes through first is the partition 33 located upstream, and the partition 33 that the fluid medium passes through later is the partition 33 located downstream. That is to say, the fluid medium flows from the flow channel 30c of the partition 33 located upstream to the flow channel 30c of the partition 33 located downstream.

[0562] By making the number of flow channels 30c of the downstream partition 33 more than that of the upstream partition 33, it is beneficial to improve the heat exchange capacity of the downstream partition 33, so as to ensure the balance of the heat exchange capacities of multiple partitions 33, enhance the overall heat management capacity, and effectively alleviate the phenomenon of local temperature rise inside the battery 100.

[0563] In some embodiments, the medium inlets 3412 of multiple partitions 33 are interconnected, and the medium outlets 3422 of multiple partitions 33 are interconnected.

[0564] Among them, the medium inlets 3412 of multiple partitions 33 can be directly connected or connected through other components, such as connecting pipes, etc. Similarly, the medium outlets 3422 of multiple partitions 33 are also the same to realize the parallel structure of multiple partitions 33.

[0565] By interconnecting the medium inlets 3412 of multiple partitions 33 and interconnecting the medium outlets 3422 of multiple partitions 33 to realize the parallel structure of multiple partitions 33, on the one hand, the function of injecting fluid medium into the flow channels 30c of multiple partitions 33 simultaneously can be realized, and on the other hand, the heat exchange capacity of each partition 33 can be effectively guaranteed to be balanced, and further the phenomenon of local temperature rise inside the battery 100 can be effectively alleviated. [[ID=eleven]]

[0566] In some embodiments, as Figure 24 shown, a partition member 335 is provided in the cavity 30a. The partition member 335 is used to divide the cavity 30a into at least two flow channels 30c, which is convenient for controlling 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.

[0567] For example, multiple flow channels 30c can be arranged in sequence along the third direction z, and each flow channel 30c extends along the second direction y. The third direction is perpendicular to the second direction and parallel to the first wall 201.

[0568] Each flow channel 30c can be independent of each other or interconnected. Only some of the multiple flow channels 30c can accommodate the fluid medium, or each flow channel 30c can accommodate the fluid medium. Therefore, the partition member 335 divides the inside of the partition 33 into multiple flow channels 30c, which is convenient for controlling the distribution of the fluid medium inside the partition 33 according to actual needs, so as to reasonably adjust the temperature of the battery cell 20.

[0569] Optionally, the partition member 335 and the partition 33 are integrally formed. For example, the partition member 335 and the partition 33 are formed by an integral forming process such as casting and extrusion. The partition member 335 and the partition 33 can also be separately arranged and then connected to the inner wall of the partition by means of welding, bonding, clamping, etc.

[0570] Of course, only one flow channel 30c may also be formed in the cavity 30a.

[0571] In some embodiments, the separator 33 includes a main body plate 331. A cavity 30a is provided inside the main body plate 331. The cavity 30a may have one or more flow channels 30c. The insulating layer 32 includes a first insulating layer 32a, and at least a part of the first insulating layer 32a is disposed between the main body plate 331 and the battery cell 20.

[0572] Furthermore, referring to Figure 20 and Figure 21 , the separator 33 further includes a manifold 332. The manifold 332 includes a manifold chamber 332a ( Figure 26 , Figure 28 shown in), the manifold chamber 332a communicates with a plurality of flow channels 30c. The insulating layer 32 includes a second insulating layer 32b, and at least a part 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.

[0573] "The second insulating layer 32b covers at least a part of the outer surface of the manifold 332" can be understood as that a part of the second insulating layer 32b covers at least a part of the outer surface of the manifold 332 to insulate and isolate the battery cell 20 and the manifold 332.

[0574] Wherein, the two manifolds 332 at both ends of the separator 33 may be a first current collecting member 341 and a second current collecting member 342 respectively.

[0575] It may be that only a part of the second insulating layer 32b covers at least a part of the outer surface of the first current collecting member 341 or only a part of the second insulating layer 32b covers at least a part of the outer surface of the second current collecting member 342, or a part of the second insulating layer 32b covers at least a part of the outer surface of the first current collecting member 341 and a part of the second insulating layer 32b covers at least a part of the outer surface of the second current collecting member 342.

[0576] In the case where a part of the second insulating layer 32b covers at least a part of the surface of the first current collecting member 341, a part of the second insulating layer 32b may only cover a part of the outer surface of the first current collecting member 341. For example, a part of the second insulating layer 32b only covers the outer peripheral surface of the first current collecting member 341, and the two end faces of the first current collecting member 341 along the third direction z are not covered by the insulating layer 32. Compared with the case where the insulating layer 40 only covers the main body plate 331, the creepage distance between the battery cell 20 and the part of the first current collecting member 341 not covered by the insulating layer 32 can be increased, thereby reducing the risk of short circuit of the battery 100; or a part of the insulating layer 32 covers the entire outer surface of the first current collecting member 341.

[0577] In some other embodiments, the insulating layer 32 may also not cover the outer surface of the first current collector 341. The first current collector 341 extends along the third direction z, and the second current collector 342 extends along the third direction z.

[0578] In the case where the second insulating layer 32b partially covers at least a part of the surface of the second current collector 342, a part of the insulating layer 32 may only cover a part of the outer surface of the second current collector 342. For example, a part of the insulating layer 32 only covers the outer circumferential surface of the second current collector 342, and the two end faces of the second current collector 342 along the third direction z are not covered by the second insulating layer 32b. Compared with the case where the insulating layer 40 only covers the main body plate 331, the creepage distance between the battery cell 20 and the part of the second current collector 342 not covered by the insulating layer 40 can be increased, thereby reducing the risk of short circuit of the battery 100; or a part of the second insulating layer 32b covers the entire outer surface of the second current collector 342.

[0579] In some other embodiments, as Figure 27 , Figure 29 shown, the insulating layer 32 may also not cover the outer surface of the second current collector 342.

[0580] Therefore, the second insulating layer 32b covers at least a part of the outer surface of the current collector pipe 332. The second insulating layer 32b may completely cover the outer surface of the current collector pipe 332, or may only cover the surface of the current collector pipe 332 facing the battery cell 20. The second insulating layer 32b can be used for insulating and isolating the current collector pipe 332 and the battery cell 20, thereby reducing the risk of battery short circuit and improving the safety performance of the battery.

[0581] In this embodiment, the current collector pipe 332 may be located on one side of the battery cell 20. Since the current collector pipe 332 also contains a fluid medium, the current collector pipe 332 can also be used for heat exchange of the battery cell 20. The second insulating layer 32b covers at least a part of the outer surface of the current collector pipe 332. The second insulating layer 32b may completely cover the outer surface of the current collector pipe 332, or may only cover the surface of the current collector pipe 332 facing the battery cell 20. The second insulating layer 32b can be used for insulating and isolating the current collector pipe 332 and the battery cell 20, thereby reducing the risk of battery short circuit and improving the safety performance of the battery.

[0582] Please refer to Figure 20 , Figure 21 , Figure 25 and Figure 26, in this embodiment, the two manifolds 332 are respectively a first manifold member 341 and a second manifold member 342; the first manifold member 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 member 341. The second manifold member 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 member 342. Both the first manifold chamber 3411 and the second manifold chamber 3421 communicate with each flow channel 30c.

[0583] The medium inlet 3412 is provided on the first manifold member 341, the medium outlet 3422 is provided on the second manifold member 342, and both the first manifold chamber 3411 of the first manifold member 341 and the second manifold chamber 3421 of the second manifold member 342 communicate with each flow channel 30c. Then, 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 member 342 and be collected in the second manifold chamber 3421, and then discharged from the medium outlet 3422.

[0584] In some other embodiments, the partition 33 may not be provided with the manifold 332, and a medium inlet 3412 and a medium outlet 3422 are correspondingly provided for each flow channel 30c. The fluid medium enters the flow channel 30c from the respective medium inlet 3412 of each flow channel 30c and is discharged from the respective flow channel 30c. This setting method is convenient for independently controlling the total amount and flow rate of the fluid medium in each flow channel 30c.

[0585] In this embodiment, the setting of the first manifold member 341 is beneficial to the distribution of the fluid medium to each flow channel 30c and beneficial to the uniformity of the temperature regulation of the battery cell 20. The setting of the second manifold member 342 is beneficial to the rapid discharge of the fluid medium and improves the heat exchange efficiency.

[0586] In some embodiments, as Figure 25 and Figure 26 shown, the thickness of the second insulating layer 32b is h3, and the wall thickness of the main body plate 331 is h2, and h3 / h2 ≥ 0.00625, so that the creepage distance between the manifold 332 and the battery cell 20 is larger and the safety is higher, thereby reducing the risk of electrical contact between the two in various usage scenarios.

[0587] h3 / h2 can be 0.01, 0.015, 0.1, 0.15, 0.2, 0.25, 0.3, 0.35, 0.4, etc.

[0588] 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 thickness of the first insulating layer is not equal to the thickness of the second insulating layer.

[0589] In some embodiments, with reference to Figure 20 , Figure 21 , Figures 25 - 29 , a first diversion tube 343 is provided at the medium inlet 3412, and a second diversion tube 344 is provided at the medium outlet 3422; the insulating layer 32 further includes a third insulating layer 32c; a part of the third insulating layer 32c covers the outer surface of the first diversion tube 343 to insulate and isolate the battery cell 20 and the first diversion tube 343; and / or, a part of the third insulating layer 32c covers the outer surface of the second diversion tube 344 to insulate and isolate the battery cell 20 and the second diversion tube 344.

[0590] It is possible that only the medium inlet 3412 is provided with the first diversion tube 343, or it is possible that only the medium outlet 3422 is provided with the second diversion tube 344, or the medium inlet 3412 is provided with the first diversion tube 343 and the medium outlet 3422 is provided with the second diversion tube 344. Figure 20 And Figure 21 shows the case where the medium inlet 3412 is provided with the first diversion tube 343 and the medium outlet 3422 is provided with the second diversion tube 344.

[0591] As Figure 20 , Figure 21 , Figures 25 - 29 shown, when a part of the insulating layer 32 covers the outer surface of the first diversion tube 343, the part of the insulating layer 32 may only cover a part of the outer surface of the first diversion tube 343. For example, the part of the insulating layer 32 only covers the outer circumferential surface of the first diversion tube 343, and the two end faces of the first diversion tube 343 along the axial direction are not covered by the insulating layer 32. Compared with the case where the insulating layer 32 only covers the main body plate 331, the first bus bar 341 and the second bus bar 342, the creepage distance between the battery cell 20 and the part of the first diversion tube 343 not covered by the insulating layer 32 can be increased, thereby reducing the risk of short circuit of the battery 100; or the part of the insulating layer 32 covers the entire outer surface of the first diversion tube 343. In other embodiments, as Figure 25 shown, the insulating layer 32 may also not cover the outer surface of the first diversion tube 343.

[0592] As Figure 20 , Figure 21 , Figures 25 - 29As shown, when a part of the insulating layer 32 covers the outer surface of the second diversion pipe 344, the part of the insulating layer 32 may only cover a part of the outer surface of the second diversion pipe 344. For example, the part of the insulating layer 32 only covers the outer circumferential surface of the second diversion pipe 344, and the two end faces of the second diversion pipe 344 along the axial direction are not covered by the insulating layer 32. Compared with the case where the insulating layer 32 only covers the main body plate 331, the first current collecting member 341, and the second current collecting member 342, the creepage distance between the battery cell 20 and the part of the second diversion pipe 344 not covered by the insulating layer 32 can be increased, thereby reducing the risk of short circuit of the battery 100; or the part of the insulating layer 32 covers the entire outer surface of the second diversion pipe 344.

[0593] In some other embodiments, the insulating layer 32 may also not cover the outer surface of the second diversion pipe 344.

[0594] As Figure 20 , Figure 21 , Figures 25 - 29 shown, the first diversion pipe 343 and the second diversion pipe 344 are coaxially arranged, and the axial directions of both the first diversion pipe 343 and the second diversion pipe 344 are parallel to the second direction y.

[0595] As Figure 20 , Figure 21 , Figures 25 - 29 shown, one end of the first diversion pipe 343 is inserted into the medium inlet 3412 on the first current collecting member 341 and is welded to the first current collecting member 341. One end of the second diversion pipe 344 is inserted into the medium outlet 3422 on the second current collecting member 342 and is welded to the second current collecting member 342.

[0596] A first limiting portion 361 is provided on the outer circumferential surface of the first diversion pipe 343. The first limiting portion 361 protrudes from the outer circumferential surface of the first diversion pipe 343 in the radial direction of the first diversion pipe 343. The first limiting portion 361 is used to limit the distance that the first diversion pipe 343 is inserted into the first current collecting member 341. When the first diversion pipe 343 is inserted into the medium inlet 3412 of the first current collecting member 341, the first limiting portion 361 abuts against the outer wall of the first current collecting member 341. The first diversion pipe 343 can be welded to the first current collecting member 341 through the first limiting portion 361.

[0597] A second limiting portion 371 is provided on the outer circumferential surface of the second diversion pipe 344. The second limiting portion 371 protrudes from the outer circumferential surface of the second diversion pipe 344 in the radial direction of the second diversion pipe 344. The second limiting portion 371 is used to limit the distance that the second diversion pipe 344 is inserted into the second current collecting member 342. When the second diversion pipe 344 is inserted into the medium flow outlet of the second current collecting member 342, the second limiting portion 371 abuts against the outer wall of the second current collecting member 342. The second diversion pipe 344 can be welded to the second current collecting member 342 through the second limiting portion 371.

[0598] In other embodiments, the medium inlet 3412 may not be provided with the first flow guide pipe 343 , and the medium outlet 3422 may not be provided with the second flow guide pipe 344 .

[0599] The first flow conduit 343 facilitates the entry of fluid into the first conduit chamber 3411 of the first conduit member 341, while the second flow conduit 344 facilitates the discharge of fluid from the second conduit chamber 3421 of the second conduit member 342. The insulating layer 32 partially covers the outer surface of the first flow conduit 343, insulating and isolating the first flow conduit 343 from the battery cell 20, and / or partially covers the outer surface of the second flow conduit 344, insulating and isolating the second flow conduit 344 from the battery cell 20, thereby reducing the risk of short circuits in the battery 100 and improving the safety of the battery 100.

[0600] In some embodiments, along the second direction y, the first busbar 341 and the second busbar 342 are respectively located on both sides of the battery cell 20 , and the third direction z is perpendicular to the second direction y.

[0601] The first busbar 341 and the second busbar 342 are respectively located on both sides of the battery cell 20, so that the arrangement direction of the first busbar 341 and the second busbar 342 is staggered with the extension direction of the pole ear of the battery cell 20, so that the first busbar 341 and the second busbar 342 are staggered with the power output pole of the battery cell 20, thereby avoiding the first busbar 341 and the second busbar 342 affecting the charging and discharging of the battery cell 20 or avoiding the first busbar 341 and the second busbar 342 affecting the series connection, parallel connection or mixed connection between each battery cell 20.

[0602] like Figure 20 As shown, the main plate 331 extends beyond both ends of the battery cells 20 along the second direction y. The first busbar 341 and the second busbar 342 are respectively connected to both ends of the main plate 331 along the second direction y. Multiple battery cells 20 can be stacked in the second direction y without interfering with the first busbar 341 and the second busbar 342, allowing for a more compact arrangement of the multiple battery cells 20, thereby reducing the volume of the battery 100.

[0603] In some embodiments, the battery cell 20 includes a battery box 21 and an insulating layer (not shown) connected to the outer surface of the battery box 21 . The insulating layer is used to insulate and isolate the reinforcing member 30 from the battery box 21 .

[0604] The insulating layer can be a blue film covering the outer surface of the battery case 21 or an insulating coating applied to the outer surface of the battery case 21. An insulating layer is connected to the surface of the battery case 21 of the battery cell 20. The insulating layer on the battery cell 20 and the insulating layer 32 on the reinforcing member 30 jointly insulate and isolate the battery cell 20 and the reinforcing member 30, further reducing the risk of short circuit of the battery 100.

[0605] In some embodiments, as Figures 52 - 64 shown, the reinforcing member 30 includes a first heat-conducting plate 3331, a second heat-conducting plate 3332, and a separator 335 that are stacked. 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 jointly define a first flow channel 34, and the second heat-conducting plate 3332 and the separator 335 jointly define a second flow channel 35.

[0606] When the reinforcing member 30 is disposed between two adjacent battery cells 20, the first flow channel 34 and the second flow channel 35 respectively correspond to the two adjacent battery cells 20. The fluid medium in the first flow channel 34 and the fluid medium in the second flow channel 35 can respectively exchange heat with the two battery cells 20, reducing the temperature difference between the two adjacent battery cells 20. The expansion of one battery cell 20 will not squeeze and reduce the size of the flow channel corresponding to the other battery cell 20 or has 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.

[0607] In addition, the first flow channel 34 and the second flow channel 35 respectively correspond to two adjacent battery cells 20 and can independently withstand the deformation caused by the expansion of their respective corresponding battery cells 20. Therefore, the expansion of one battery cell 20 has little interference with the expansion of the other battery cell 20 or has no impact on the expansion of the other battery cell 20, which is beneficial to the release of the expansion of the two adjacent battery cells 20, reducing the risk of premature pressure relief or serious thermal runaway accidents caused by the mutual interference of the expansion of the two adjacent battery cells 20, and improving the safety performance of the battery 100.

[0608] Both the first flow channel 34 and the second flow channel 35 are used to accommodate the fluid medium, and the fluid medium can flow in the first flow channel 34 and the second flow channel 35. Among them, the first flow channel 34 and the second flow channel 35 can be independent of each other. The fluid medium in the first flow channel 34 will not enter the second flow channel 35, and the fluid medium in the second flow channel 35 will not enter the first flow channel 34.

[0609] Exemplarily, along the extending 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. The fluid medium enters the first flow channel 34 from the first inlet and is discharged from the first outlet of the first flow channel 34; along the extending 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. The fluid medium enters the second flow channel 35 from the second inlet and is discharged from the second outlet of the second flow channel 35.

[0610] The first flow channel 34 and the second flow channel 35 can communicate with 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.

[0611] In an embodiment where there is one battery cell 20, the reinforcing member 30 is disposed on one side of the battery cell 20 and is located between the battery cell 20 and the inner wall of the box body 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 box body 10 than the first flow channel 34.

[0612] In an embodiment where there are multiple battery cells 20, the multiple battery cells 20 are stacked and arranged in a certain direction (the stacking direction of the first heat conducting plate 3331, the second heat conducting plate 3332 and the partition member 335, the first direction x).

[0613] As Figure 53 and Figure 54 shown, a reinforcing member 30 can be disposed between two adjacent battery cells 20. For the convenience of description, two adjacent battery cells 20 are respectively defined as the first battery cell 21 and the second battery cell 22. The arrangement directions of the first flow channel 34 and the second flow channel 35 are the same as the stacking direction of the first battery cell 21 and the second battery cell 22, and the arrangement directions of the first flow channel 34 and the second flow channel 35 are the same as the stacking direction of the first heat conducting plate 3331, the second heat conducting plate 3332 and the partition member 335. The first flow channel 34 is disposed corresponding to the first battery cell 20, the first heat conducting plate 3331 is used for thermally connecting with the first battery cell 20, and the fluid medium in the first flow channel 34 is used for heat exchange with the first battery cell 21 to adjust the temperature of the first battery cell 21; the second flow channel 35 is disposed corresponding to the second battery cell 22, the second heat conducting plate 3332 is used for thermally connecting with the second battery cell 22, and the fluid medium in the second flow channel 35 is used for heat exchange with the second battery cell 22 to adjust the temperature of the second battery cell 22.

[0614] Thermal connection means that heat transfer can occur between two objects. For example, if the first heat conducting plate 3331 is thermally connected to the first battery cell 20, heat transfer can occur between the first battery cell 20 and the first heat conducting plate 3331. Then, heat transfer can be carried out between the fluid medium in the first flow channel 34 and the first battery cell 20 through the first heat conducting plate 3331, thereby realizing heat exchange between the fluid medium in the first flow channel 34 and the first battery cell 20. If the second heat conducting plate 3332 is thermally connected to the second battery cell 22, heat transfer can occur between the second battery cell 22 and the second heat conducting plate 3332. Then, heat transfer can be carried out between the fluid medium in the second flow channel 35 and the second battery cell 22 through the second heat conducting plate 3332, thereby realizing heat exchange between the fluid medium in the second flow channel 35 and the second battery cell 22.

[0615] As Figure 53 and Figure 54 shown, the fluid medium in the first flow channel 34 and the fluid medium in the second flow channel 35 can respectively exchange heat with the two battery cells 20, reducing the temperature difference between two adjacent battery cells 20. The expansion of one battery cell 20 will not squeeze or 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 ensuring the safety performance of the battery 100 using the reinforcement member 30. For example, when the battery cell 20 corresponding to the first flow channel 34 (the first battery cell 20) expands, the size of the first flow channel 34 in the stacking direction of the first heat conducting member, the second heat conducting member, and the separator (i.e., the first direction x) will decrease, but the first battery cell 20 will not affect or have little impact 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, thereby ensuring the heat exchange capacity of the second flow channel 35 for the corresponding battery cell 20 (the second battery cell 22). Similarly, when the battery cell 20 corresponding to the second flow channel 35 (the second battery cell 22) expands, 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 decrease, but the second battery cell 22 will not affect or have little impact 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 (the second battery cell 22).

[0616] Since the first flow channel 34 and the second flow channel 35 respectively correspond to two adjacent battery cells 20, they can independently withstand the deformation caused by the expansion of their respective corresponding battery cells 20. Therefore, the expansion of one battery cell 20 has little interference on the expansion of the other battery cell 20 or does not affect 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 that the expansion of the two adjacent battery cells 20 interferes with each other, causing the battery cell 20 to release pressure prematurely or resulting in a serious thermal runaway accident, further improving the safety performance of the battery 100. In addition, the fluid media in the first flow channel 34 and the second flow channel 35 can respectively exchange heat with the two battery cells 20, reducing the temperature difference between the two adjacent battery cells 20, thereby ensuring the safety performance of the battery 100 using the reinforcement 30.

[0617] The number of the first flow channels 34 can be one or more, and the number of the second flow channels 35 can be one or more. In some embodiments, there are multiple first flow channels 34, and / or there are multiple second flow channels 35.

[0618] It can be that the number of the first flow channels 34 is multiple and the number of the second flow channels 35 is one; it can also be that the number of the first flow channels 34 is one and the number of the second flow channels 35 is multiple; it can also be that the number of the first flow channels 34 is multiple and the number of the second flow channels 35 is multiple. In the embodiments where there are multiple first flow channels 34, that is, the first heat conducting plate 3331 and the partition 33 jointly define multiple first flow channels 34, and the multiple first flow channels 34 are arranged in sequence along the third direction z, and each first flow channel 34 extends along the second direction y. The third direction z is perpendicular to the second direction y. In the embodiments where there are multiple second flow channels 35, that is, the second heat conducting plate 3332 and the partition 33 jointly define multiple second flow channels 35, and the multiple second flow channels 35 are arranged in sequence along the third direction z, and each second flow channel 35 extends along the second direction y.

[0619] In some other embodiments, the arrangement directions of the multiple first flow channels 34 and the multiple second flow channels 35 can be different. The extension directions of the first flow channel 34 and the second flow channel 35 can be different. Of course, the extension directions of the multiple first flow channels 34 can be different, and the extension directions of the multiple second flow channels 35 can also be different.

[0620] Having multiple first flow channels 34 and / or multiple second flow channels 35 enables the reinforcement 30 to accommodate more fluid medium and makes the fluid medium distribution more uniform, which is beneficial to improving the heat exchange efficiency and heat exchange uniformity and reducing the temperature difference in different regions of the battery cell 20.

[0621] There are various forming methods for the first flow channel 34. In some embodiments, such as Figures 55 - 59As shown, the separator 335 is provided with a first groove 3351, and the first groove 3351 forms part of the first flow channel 34.

[0622] That the "first groove 3351 forms part of the first flow channel 34" means that the groove wall of the first groove 3351 serves as part of the wall of the first flow channel 34. The first groove 3351 has various forms. For example, as Figure 56 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 oppositely, and the first groove 3351 is provided on the first surface 3352 and recessed in the direction close to the second surface 3353. Another example is, as Figure 58 shown, the first groove 3351 is provided on the first surface 3352. The first groove 3351 is recessed from the first surface 3352 in the direction close to the second surface 3353, and a first convex portion 3354 is formed at a position on the second surface 3353 corresponding to the first groove 3351.

[0623] 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.

[0624] 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 heat management component 30 in the stacking direction of the first heat conducting plate 3331, the second heat conducting plate 3332, and the separator 335 is reduced.

[0625] As Figures 55 - 58 shown, in some embodiments, the first heat conducting plate 3331 seals the notch of the first groove 3351 facing the first heat conducting plate 3331 to form the first flow channel 34.

[0626] In some embodiments, one 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 seals the notch of the first groove 3351 facing the first heat conducting plate 3331, thereby forming the first flow channel 34. In other words, the first heat conducting plate 3331 forms another part of the first flow channel 34. Therefore, in the embodiment where one side of the first heat conducting plate 3331 facing the separator 335 abuts against the first surface 3352, the 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. That one side of the first heat conducting plate 3331 facing the separator 335 abuts against the first surface 3352 may mean that the surface of the first heat conducting plate 3331 facing the separator 335 contacts the first surface 3352 without a connection relationship, or that the surface of the first heat conducting plate 3331 facing the separator 335 contacts and connects with the first surface 3352, such as by welding.

[0627] In other embodiments, the first surface 3352 is not provided with the first groove 3351, and there is a gap between one side of the first heat conducting plate 3331 facing the separator 33 and the first surface 3352. Then, the first groove 3351, the first surface 3352, and the first heat conducting plate 3331 jointly define the first flow channel 34.

[0628] The first heat conducting plate 3331 seals the notch of the first groove 3351 facing the first heat conducting plate 3331 to form the first flow channel 34, so that the first heat conducting plate 3331 and the separator 335 are arranged more compactly in the stacking direction X of the first heat conducting plate 3331, the second heat conducting plate 3332, and the separator 445, thereby reducing the size of the heat management component 30 in the stacking direction of the first heat conducting plate 3331, the second heat conducting plate 3332, and the separator 445.

[0629] In other embodiments, the first surface 3352 of the separator 335 is not provided with the first groove 3351, there is a gap between one 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.

[0630] There are various ways to form the second flow channel 35. For example, Figures 55 - 58 As shown, in some embodiments, the separator 33 is provided with a second groove 3355, and the second groove 3355 forms part of the second flow channel 35.

[0631] "The second groove 3355 forms part of the second flow channel 35" means that the wall of the second groove 3355 serves as part of the wall of the second flow channel 35. The second groove 3355 has various forms. For example,Figure 55 As shown, along the stacking direction x of the first heat conduction plate 3331, the second heat conduction plate 3332, and the separator, the second groove 3355 is provided on the second surface 3353 and is recessed in a direction approaching the first surface 3352. For another example, as Figure 57 shown, the second groove 3355 is provided on the second surface 3353. The second groove 3355 is recessed from the second surface 3353 in a direction approaching the first surface 3352, and a second convex portion 3356 is formed at a position on the first surface 3352 corresponding to the second groove 3355.

[0632] 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.

[0633] The second groove 3355 provided on the separator 335 forms part of the second flow channel 35. When ensuring that the cross-sectional area of the second flow channel 35 is sufficient, the size of the heat management component 30 along the stacking direction x of the first heat conduction plate 3331, the second heat conduction plate 3332, and the separator 335 is reduced.

[0634] As Figures 55 - 58 shown, in some embodiments, the second heat conduction plate 3332 blocks the notch of the second groove 3355 facing the second heat conduction plate 3332 to form the second flow channel 35.

[0635] In some embodiments, the side of the second heat conduction plate 3332 facing the separator 335 abuts against the second surface 3353, so that the second heat conduction plate 3332 blocks the notch of the second groove 3355 facing the second heat conduction plate 3332, thereby forming the second flow channel 35. In other words, the second heat conduction plate 3332 forms another part of the first flow channel 34. Therefore, in the embodiment where the side of the second heat conduction 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 conduction 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 conduction plate 3332 facing the separator 335 abutting against the second surface 3353 may be that the surface of the second heat conduction plate 3332 facing the separator 335 is in contact with the second surface 3353 but has no connection relationship, or the surface of the second heat conduction plate 3332 facing the separator 335 is in contact connection with the second surface 3353, such as welding.

[0636] In some other embodiments, the second surface 3353 is not provided with the 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. Then, the second groove 3355, the second surface 3353 and the second heat conducting plate 3332 jointly define the second flow channel 35.

[0637] The second heat conducting plate 3332 seals the notch of the second groove 3355 facing the second heat conducting plate 3332 to form the second flow channel 35, so that the second heat conducting plate 3332 and the separator 335 are arranged more compactly in the stacking direction X 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 in the stacking direction of the first heat conducting plate 3331, the second heat conducting plate 3332 and the separator 335.

[0638] Please continue to refer to Figures 55 - 58 , in the embodiments where there are multiple first flow channels 34, there are multiple first grooves 3351, and the multiple first grooves 3351 are arranged along the third direction z, and the third direction z is perpendicular to the stacking direction of the first heat conducting plate 3331, the second heat conducting plate 3332 and the separator 335. The first heat conducting plate 3331 seals the notches of the multiple first grooves 3351 facing the first heat conducting plate 3331, thereby forming multiple first flow channels 34.

[0639] In the embodiments where there are multiple second flow channels 35, there are multiple second grooves 3355, and the multiple second grooves 3355 are arranged along the third direction z, and the third direction z is perpendicular to the stacking direction of the first heat conducting plate 3331, the second heat conducting plate 3332 and the separator 335. The second heat conducting plate 3332 seals the notches of the multiple second grooves 3355 facing the second heat conducting plate 3332, thereby forming multiple second flow channels 35.

[0640] Among them, the separator 335 may be provided with multiple first grooves 3351 only on the first surface 3352, and one second groove 3355 or no second groove 3355 is provided on the second surface 3353; or the separator 335 is provided with multiple second grooves 3355 only on the second surface 3353, and one first groove 3351 or no first groove 3351 is provided on the first surface 3352; or the separator 335 is provided with multiple first grooves 3351 on the first surface 3352 and multiple second grooves 3355 on the second surface 3353.

[0641] There are multiple first grooves 3351, which can form multiple first flow channels 34; and / or there are multiple second grooves 3355, which can form multiple second flow channels 35, so that the reinforcing member 30 can accommodate more fluid media and make the fluid media distribution more uniform, which is beneficial to improving the heat exchange efficiency and heat exchange uniformity and reducing the temperature difference in different regions of the battery cell 20.

[0642] Please refer to Figures 55 - 58 , the first groove 3351 and the second groove 3355 are arranged alternately along the third direction z.

[0643] "The first groove 3351 and the second groove 3355 are arranged alternately along the third direction z" means that along the stacking direction X of the first heat conducting plate 3331, the second heat conducting plate 3331 and the separator 335, at least a part of the projection of each second groove 3355 on the first surface 3352 along the third direction z is located between two adjacent first grooves 3351; and / or, along the stacking direction X of the first heat conducting plate 3331, the second heat conducting plate 3331 and the separator 335, at least a part 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 along the third direction z.

[0644] Figures 55 - 56 shows the case where, along the stacking direction X 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 shows the case where, along the stacking direction X of the first heat conducting plate 3331, the second heat conducting plate 3332 and the separator, a part of the projection of each second groove 3355 on the first surface 3352 along the third direction z is located between two adjacent first grooves 3351, and another part of the projection of each second groove 3355 on the first surface 3352 along the third direction z overlaps with the first groove 3351.

[0645] 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 heat management component 30 is located between two adjacent battery cells 20, the temperature distribution of the battery cell 20 corresponding to the first flow channel 34 is relatively uniform along the third direction z and the temperature distribution of the battery cell 20 corresponding to the second flow channel 35 is relatively uniform along the third direction z.

[0646] Please refer to Figures 57 - 59 , in some embodiments, the separator 335 is a corrugated plate, which has a simple structure and is convenient to manufacture.

[0647] In this embodiment, the first groove 3351 is provided on the first surface 3352. The first groove 3351 is recessed from the first surface 3352 towards the second surface 3353, and a first protrusion 3354 is formed at a position on the second surface 3353 corresponding to the first groove 3351. The second groove 3355 is provided on the second surface 3353. The second groove 3355 is recessed from the second surface 3353 towards the first surface 3352, and a second protrusion 3356 is formed at a position on the first surface 3352 corresponding to the second groove 3355. The first groove 3351 and the second groove 3355 are 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.

[0648] In other embodiments, the separator 335 may also be a component with other structural forms, such as Figure 55 and Figure 56 shown.

[0649] As Figure 60 shown, the formation of the first flow channel 34 may also be achieved in other forms. For example, in 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 jointly define the first flow channel 34.

[0650] Both the body portion 3357 and the first separator portion 3358 are flat plate structures, and a first space is defined between the body portion 3357 and the first heat conducting plate 3331. The number of the first separator portions 3358 may be one or more. In embodiments where there are multiple first separator portions 3358, the multiple first separator portions 3358 are arranged at intervals along the first direction Y, and the multiple first separator portions 3358 divide the first space into multiple first sub - spaces. Thus, the body portion 3357, the first heat conducting plate 3331, and the multiple first separator portions 3358 jointly define multiple first flow channels 34. The body portion 3357 and the first separator portion 3358 may be integrally formed. For example, the body portion 3357 and the first separator portion 3358 are formed by integral forming processes such as casting and extrusion. The body portion 3357 and the first separator portion 3358 are separately provided and then connected into a whole through methods such as welding, soldering, and screw connection.

[0651] The body part 3357, the first partition part 3358 and the first heat conducting plate 3331 jointly define a plurality of first flow channels 34, enabling the reinforcing member 30 to accommodate more fluid medium and making the fluid medium distribution more uniform, which is beneficial to improving the heat exchange efficiency and heat exchange uniformity, reducing the temperature difference in different regions of the battery cell 20, and the first partition part 3358 can support the first heat conducting plate 3331, enhancing the ability of the first heat conducting plate 3331 to resist deformation.

[0652] The formation of the second flow channel 35 can also be in other forms. For example, please continue to refer to Figure 13 The partition member 33 further includes a second partition part 3359. The two ends of the second partition part 3359 along the second direction Z are respectively connected to the body part 3357 and the second heat conducting plate 3332. The body part 3357, the second partition part 3359 and the second heat conducting plate 3332 jointly define the second flow channel 35.

[0653] Both the body part 3357 and the second partition part 3359 are flat plate structures. A second space is defined between the body part 3357 and the second heat conducting plate 3332. The number of the second partition parts 3359 can be one or more. In the embodiment where there are multiple second partition parts 3359, the multiple second partition parts 3359 are arranged at intervals along the first direction Y, and the multiple second partition parts 3359 divide the second space into multiple second sub-spaces. Thus, the body part 3357, the second heat conducting plate 3332 and the multiple second partition parts 3359 jointly define a plurality of second flow channels 35. The body part 3357 and the second partition part 3359 can be integrally formed. For example, the body part 3357 and the second partition part 3359 are formed by integral forming processes such as casting and extrusion. The body part 3357 and the second partition part 3359 are separately arranged and then connected into a whole by means of welding, soldering, screw connection, etc. In addition, the body part 3357, the first partition part 3358 and the second partition part 3359 can be integrally formed.

[0654] The body part 3357, the second partition part 3359 and the second heat conducting plate 3332 jointly define a plurality of second flow channels 35, enabling the reinforcing member 30 to accommodate more fluid medium and making the fluid medium distribution more uniform, which is beneficial to improving the heat exchange efficiency and heat exchange uniformity, reducing the temperature difference in different regions of the battery cell 20, and the second partition part 3359 can support the first heat conducting plate 3331, enhancing the ability of the second heat conducting plate 3332 to resist deformation.

[0655] The first flow channel 34 and the second flow channel 35 can extend in the same direction or in different directions. In this embodiment, the extending directions of the first flow channel 34 and the second flow channel 35 are the same. Both the first flow channel 34 and the second flow channel 35 extend along the second direction Y, which is convenient for manufacturing.

[0656] 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 of the fluid medium in the first flow channel 34 with respect to the corresponding battery cell 20 gradually weakens. For example, when 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 in the first flow channel 34 and the second flow channel 35 will gradually increase, and the cooling capacity of the fluid medium with a higher temperature for the battery cell 20 weakens.

[0657] Based on the above considerations, in some embodiments, along the extending direction of the first flow channel 34 and the second flow channel 35, the first flow channel 34 has a first inlet (not shown in the figure) and a first outlet (not shown in the figure), and the second flow channel 35 has a second inlet (not shown in the figure) and a second outlet (not shown in the figure), and the direction from the first inlet to the first outlet is opposite to the direction from the second inlet to the second outlet.

[0658] The first inlet supplies the fluid medium to enter the first flow channel 34, and the first outlet supplies the fluid medium to discharge from the first flow channel 34; the second inlet supplies the fluid medium to enter the second flow channel 35, and the second outlet supplies the fluid medium to discharge from the second flow channel 35.

[0659] Exemplarily, as Figure 61 shown, in an embodiment where the 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 �5 of the other reinforcing member 30. Then, the fluid media on both sides of the battery cell 20 flow in opposite directions. Along the extending direction of the first flow channel 34 and the second flow channel 35 (the second direction y), the heat exchange capacities of the fluid medium in the first flow channel 34 and the fluid medium in the second flow channel 35 can be complementary, thereby reducing the difference in the local temperature of the battery cell 20.

[0660] 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 in the region of the battery cell 20 closer to the inlet of the corresponding flow channel is better, and the heat exchange effect in the region of the battery cell 20 closer to the outlet of the corresponding flow channel is worse. This arrangement of the first flow channel 34 and the second flow channel 35 can reduce the local difference in the thermal management of the battery cells 20 in the battery 100 and make the heat exchange more uniform.

[0661] As Figure 62 shown, in some embodiments, the reinforcing member 30 includes a communication cavity 36 located at one end of the partition member 335. The first flow channel 34 is communicated with the communication cavity 36, and the second flow channel 35 is communicated with the communication cavity 36.

[0662] The communication cavity 36 is located at one end of the partition member 33. The partition member 335, the first heat conduction plate 3331, and the second heat conduction plate 3332 jointly define the communication cavity 36. In this embodiment, the communication cavity 36 is the gap between one end of the partition member 335 and the first heat conduction plate 3331 and the second heat conduction plate 3332 in the second direction y.

[0663] In other embodiments, the communication cavity 36 may also be formed by other structures. For example, the reinforcing member 30 further includes a communication pipe, the first flow channel 34 and the second flow channel 35 are communicated through the communication pipe, and the internal channel of the communication pipe is the communication cavity 36.

[0664] The number of the first flow channels 34 and the second flow channels 35 may both be multiple. In the embodiment where the number of the first flow channels 34 is multiple, it may be that all the first flow channels 34 are communicated with the communication cavity 36. Then, after the fluid medium in each first flow channel 34 is discharged from the first outlet of the first flow channel 34, it passes through the communication cavity 36 and enters the second flow channel 35 from the second inlet. In other embodiments, it may be that some of the first flow channels 34 among the multiple first flow channels 34 are communicated with the communication cavity 36, and the fluid medium in these first flow channels 34 passes through the communication cavity 36 and then enters the second flow channel 35 from the second inlet; another part of the first flow channels 34 among the multiple first flow channels 34 are not communicated with the communication cavity 36, and the fluid medium in these first flow channels 34 cannot enter the second flow channel 35. Figure 62 The direction indicated by the hollow arrow in the figure is the flow direction of the fluid medium in the first flow channel 34 and the second flow channel 35.

[0665] In the embodiment where the number of the second flow channels 35 is multiple, it may be that all the second flow channels 35 are communicated with the communication cavity 36. Then, after the fluid medium in the first flow channel 34 is discharged from the first outlet of the first flow channel 34, it can enter each second flow channel 35 from the second inlet through the communication cavity 36. In other embodiments, it may be that some of the second flow channels 35 among the multiple second flow channels 35 are communicated with the communication cavity 36, and the fluid medium in the first flow channel 34 communicated with the communication cavity 36 passes through the communication cavity 36 and then enters the second flow channel 35 communicated with the communication cavity 36 from the second inlet; another part of the second flow channels 35 among the multiple second flow channels 35 are not communicated with the communication cavity 36, and the fluid medium in the first flow channel 34 cannot enter these second flow channels 35.

[0666] In this embodiment, the number of the first flow channels 34 and the second flow channels 35 are both multiple, and each first flow channel 34 and each second flow channel 35 are communicated with the communication cavity 36.

[0667] The number of the first flow channels 34 and the second flow channels 35 may be the same or different.

[0668] If the first flow channel 34 communicates with the communication cavity 36 and the second flow channel 35 communicates with the communication 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 of the outlet (the first outlet) of the first flow channel 34 flows into the second flow channel 35 from the inlet (the second inlet) of the second flow channel 35. This arrangement can reduce the local difference in the thermal management of the battery cells 20 in the battery 100 and make the heat exchange more uniform.

[0669] 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 communicates with the communication cavity 36 through the first flow channel 34, and the medium outlet 3422 communicates with the communication cavity 36 through the second flow channel 35.

[0670] The medium inlet 3412 is disposed on the first heat conducting plate 3331 and communicates with the first flow channel 34. The medium outlet 3422 is disposed on the second heat conducting plate 3332 and communicates with the second flow channel 35.

[0671] The fluid medium enters the first flow channel 34 from the medium inlet 3412, flows through the communication cavity 36 into the second flow channel 35, and then is discharged from the medium outlet 3422. The fluid medium exchanges heat with the battery cell 20 during the flow process. Figure 62 and Figure 63 The directions indicated by the hollow arrows in

[0672] are the flow directions of the fluid medium in the first flow channel 34 and the second flow channel 35.

[0673] Please refer to Figure 62 、 Figure 63 In some embodiments, along the extending direction of the first flow channel 34, the medium inlet 3412 is disposed at one end of the first heat conducting plate 3331 away from the communication cavity 36; along the extending direction of the second flow channel 35, the medium outlet 3422 is disposed at one end of the second heat conducting plate 3332 away from the communication cavity 36.

[0674] The extending directions of both the first flow channel 34 and the second flow channel 35 are parallel to the second direction y. In some other embodiments, the extending directions of the first flow channel 34 and the second flow channel 35 may be different. For example, the extending direction of the first flow channel 34 is parallel to the second direction y, the extending direction of the second flow channel 35 is parallel to a preset direction, the included angle between the preset direction and the second direction Z is an acute angle, or the preset is perpendicular to the second direction y, and the preset direction is perpendicular to the first direction x.

[0675] A medium inlet 3412 is inserted with a medium inflow pipe 37, facilitating the connection between the medium inlet 3412 and the device providing the fluid medium. A medium outlet 3422 is inserted with a medium outflow pipe 38, facilitating the connection between the medium outlet 3422 and the device recovering the fluid medium.

[0676] The medium inlet 3412 is disposed at one end of the first heat conducting plate 3331 away from the communication cavity 36, and the medium outlet 3422 is disposed at one end of the second heat conducting plate 3332 away from the communication cavity 36. Then, 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 extending direction of the first flow channel 34 and enters the second flow channel 35, and flows through the entire second flow channel 35 along the extending direction of the second flow channel 35 and is discharged from the medium outlet 3422, so that the path of the fluid medium flowing through the heat management component 30 is the longest, to fully exchange heat with the battery cell 20 and improve the heat exchange efficiency and heat exchange uniformity.

[0677] Such as Figure 62 、 Figure 63 As shown, in some embodiments, one end of the first flow channel 34 away from the communication cavity 36 along its extending direction and one end of the second flow channel 35 away from the communication cavity 36 along its extending direction are not connected to each other.

[0678] In this embodiment, the extending directions of both the first flow channel 34 and the second flow channel 35 are parallel to the second direction y. The communication cavity 36 is located at one end of the partition 33 along the second direction y. As Figure 63 shown, the reinforcing member 30 further includes a blocking member 39 (or called a plugging member). The blocking member 39 is disposed at one end of the partition 335 away from the communication cavity 36 along the second direction y to block one end of the second flow channel 35 away from the communication cavity 36 along the second direction y, so as to prevent the fluid medium entering the first flow channel 34 from the medium inlet 3412 from flowing into the second flow channel 35 in the first flow channel 34 in a direction away from the communication cavity 36. Of course, in some other embodiments, the blocking member 39 disposed at one end of the partition 335 away from the communication cavity 36 along the second direction y can also be used to block one end of the first flow channel 34 away from the communication cavity 36 along the second direction y, so as to prevent the fluid medium entering the first flow channel 34 from the medium inlet 3412 from flowing into the second flow channel 35 in the first flow channel 34 in a direction away from the communication cavity 36.

[0679] The plugging member 39 and the partition member 335 can be separately provided, and then the separately provided plugging member 39 and partition member 335 are connected into an integral structure. For example, the plugging member 39 and the partition member 335 are connected into an integral body by means of welding, bonding, etc. The plugging member 39 and the partition member 335 can also be integrally formed, for example, formed by an integral forming process such as casting, stamping, etc.

[0680] Along the stacking direction of the first heat conducting plate 3331, the second heat conducting bar 3332 and the partition member 335, the projection of the medium outlet 3422 on the partition member 353 is located on the side of the plugging member 39 facing the communication cavity 36, so that the fluid medium in the second flow channel 35 can be discharged from the medium inlet 3412.

[0681] One end of the first flow channel 34 along its extending direction away from the communication cavity 36 is not communicated with one end of the second flow channel 35 along its extending direction away from the communication cavity 36. Then, 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 communication cavity 36 and flow through the entire second flow channel 35 and then be discharged from the medium outlet 3422, so that the path of the fluid medium flowing through the heat management component 30 is the longest, so as to fully exchange heat with the battery cell 20 and improve the heat exchange efficiency and heat exchange uniformity.

[0682] In some embodiments, both the first flow channel 34 and the second flow channel 35 are multiple, and each first flow channel 34 and each second flow channel 35 are communicated with the communication cavity 36.

[0683] In some other embodiments, the number of the first flow channels 34 can be one, the number of the second flow channels 35 is multiple, and each second flow channel 35 is communicated with the communication cavity 36; or the number of the first flow channels 34 and the number of the second flow channels 35 are both one; or the number of the second flow channels 35 can be one, the number of the first flow channels 34 is multiple, and each first flow channel 34 is communicated with the communication cavity 36.

[0684] Both the first flow channel 34 and the second flow channel 35 are multiple and are uniformly communicated with the communication cavity 36. The fluid medium of each first flow channel 34 can flow into each second flow channel 35, and the fluid medium flowing out of the outlet of the first flow channel 34 flows into the second flow channel 35 from the inlet of the second flow channel 35. This arrangement can reduce the local difference in the heat management of the battery cell 20 in the battery 100 and make the heat exchange more uniform.

[0685] In the embodiments where the first flow channel 34 is multiple, the number of the medium inlets 3412 can be set differently. For example, please refer to Figure 53 , Figure 63 , in some embodiments, there is one medium inlet 3412, and each first flow channel 34 communicates the communication cavity 36 and the medium inlet 3412.

[0686] In an embodiment where the blocking member 39 blocks one end of the second flow channel 35 away from the communication cavity 36, as Figure 63 shown, a diversion gap 310 is formed between the side of the blocking member 39 facing away from the communication cavity 36 and the first heat conduction plate 3331 and the second heat conduction plate 3332. The medium inlet 3412 communicates with each first flow channel 34 through the diversion gap 310. The fluid medium flowing in from the medium inlet 3412 enters the diversion gap 310 and then is distributed from the diversion gap 310 to each first flow channel 34.

[0687] Therefore, there is one medium inlet 3412, which is convenient for realizing the synchronous inflow of the fluid medium into each first flow channel 34, and the number of medium inlets 3412 provided on the first heat conduction plate 3331 is small, reducing the influence of the setting of the medium inlet 3412 on the structural strength of the first heat conduction plate 3331. It also makes the structure of the structure strengthening member 30 simpler and easier to manufacture.

[0688] In some other embodiments, there are multiple medium inlets 3412, and each first flow channel 34 communicates with the communication cavity 36 and one medium inlet 3412.

[0689] The number of medium inlets 3412 is the same as the number of first flow channels 34 and they correspond one by one. Each medium inlet 3412 supplies the fluid medium to flow into the corresponding first flow channel 34, which is convenient for independently controlling the entry of the fluid medium into each first flow channel 34 and for controlling the entry of the fluid medium into the required first flow channel 34 according to actual needs, so as to control the distribution of the fluid medium inside the heat regulation tube, so as to reasonably adjust the temperature of the battery cell 20.

[0690] In an embodiment where there are multiple second flow channels 35, as Figure 52 shown, there are multiple medium outlets 3422, and each second flow channel 35 communicates with the communication cavity 36 and one medium outlet 3422.

[0691] There are multiple second flow channels 35 and multiple medium outlets 3422. The medium outlets 3422 and the second flow channels 35 are arranged in one-to-one correspondence, and the fluid medium in each second flow channel 35 is discharged from the corresponding medium outlet 3422.

[0692] In some other embodiments, there can also be one medium outlet 3422, and this medium outlet 3422 communicates with each second flow channel 35, and the fluid medium in all second flow channels 35 is discharged from this medium outlet 3422.

[0693] And each second flow channel 35 communicates with the communication cavity 36 and one medium outlet 3422, so that the fluid medium can be discharged from the second flow channel 35 faster, improving the heat exchange efficiency.

[0694] In some embodiments, the partition member 335 is an integrally formed structure.

[0695] The separator 335 may be a structure formed by an integral molding method such as stamping or casting. In an embodiment where the separator 335 is a corrugated plate, the corrugated plate is formed by stamping. The separator 335 is an integral molding structure, which is convenient for manufacturing and has good structural strength.

[0696] In some embodiments, the first heat conducting plate 3331 may be an integral molding structure, and the second heat conducting plate 3332 may be an integral molding structure. For example, both the first heat conducting plate 3331 and the second heat conducting plate 3332 are formed by casting or stamping.

[0697] 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.

[0698] It may be that the first heat conducting plate 3331 is welded to the separator 335, and the second heat conducting plate 3332 and the separator 335 are connected by other means (such as bonding) or the second heat conducting plate 3332 is in contact with the separator 335 without a connection relationship. It may also be that the second heat conducting plate 3332 is welded to the separator 335, and the first heat conducting plate 3331 and the separator 335 are connected by other means (such as bonding) or the first heat conducting plate 3331 is in contact with the separator 335 without a connection relationship. In this embodiment, both the first heat conducting plate 3331 and the second heat conducting plate 3332 are welded to the separator 335.

[0699] In an embodiment where the separator 335 is a corrugated plate, the first heat conducting plate 3331 is welded to the second convex portion 3356, and the second heat conducting plate 3332 is welded to the first convex portion 3354 (please refer to Figure 58 ), such a connection method enables the separator 335 to support the first heat conducting plate 3331 and the second heat conducting plate 3332, and improves 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.

[0700] The connection between the first heat conducting plate 3331 and the separator 335 is achieved by welding, making the connection between the first heat conducting plate 3331 and the separator 335 more stable; the connection between the second heat conducting plate 3332 and the separator 335 is achieved by welding, making the connection between the second heat conducting plate 3332 and the separator 335 more stable.

[0701] As Figure 64 shown, the battery 100 includes adjacent first battery cell 21, 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.

[0702] The fluid medium in the first flow channel 34 and the fluid medium in the second flow channel 35 can respectively exchange heat with the first battery cell 21 and the second battery cell 22, reducing the temperature difference between the first battery cell 21 and the second battery cell 22.

[0703] The expansion of the first battery cell 21 will not squeeze and reduce the size of the second flow channel 35 corresponding to the second battery cell 22 or have little impact on the size of the second flow channel 35 corresponding to the second battery cell, thus ensuring the heat exchange capacity of the second flow channel 35 corresponding to the second battery cell 22; the expansion of the second battery cell 22 will not squeeze and reduce the size of the first flow channel 34 corresponding to the first battery cell 21 or have little impact on the size of the first flow channel 34 corresponding to the first battery cell, thus 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 reinforcement member 30.

[0704] In addition, the first flow channel 34 and the second flow channel 35 respectively correspond to the first battery cell 21 and the second battery cell 22. Therefore, the first flow channel 34 can withstand the deformation caused by the expansion of the first battery cell 21, and the second flow channel 35 can withstand the deformation caused by the expansion of the second battery cell 22. Therefore, the expansion of the first battery cell 21 has little interference with the expansion of the second battery cell 22 or 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 1 or does not affect the expansion of the first battery cell 21, which is beneficial to the release of the expansion of the first battery cell 1 and the second battery cell 22, reducing the risk that the mutual interference of the expansion of the first battery cell 21 and the second battery cell 22 leads to premature pressure relief of the first battery cell 21 and the second battery cell 22 or serious thermal runaway accidents, and further improving the safety performance of the battery 100.

[0705] Please continue to refer to Figure 64 , in some embodiments, a reinforcement member 30 can also be provided on the side of the first battery cell 21 facing away from the second battery cell 22, and a reinforcement member 30 can also be provided on the side of the second battery cell 22 facing away from the first battery cell 21.

[0706] For the convenience of description, the reinforcement member 30 located between the first battery cell 21 and the second battery cell 22 is defined as the first reinforcement member, the reinforcement member 30 located on the side of the first battery cell 21 facing away from the second battery cell 22 is defined as the second reinforcement member, and the reinforcement member 30 located on the side of the second battery cell 22 facing away from the first battery cell 21 is defined as the third reinforcement member.

[0707] The flow directions of the fluid media in the first flow channel 34 and the second flow channel 35 of the first reinforcing member are opposite. The flow directions of the fluid media in the first flow channel 34 and the second flow channel 35 of the second reinforcing member are opposite. The flow directions of the fluid media in the first flow channel 34 and the second flow channel 35 of the third reinforcing member are opposite.

[0708] The second heat conducting plate 3332 of the second reinforcing member is thermally connected to the side of the first battery cell 21 facing away from the second battery cell 22. The flow direction of the fluid medium in the first flow channel 34 of the first 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 capabilities of the fluid media on both sides of the first battery cell 21 along the second direction y can be complementary, thereby reducing the difference in the local temperature of the first battery cell 21.

[0709] The first heat conducting plate 3331 of the third reinforcing member is thermally connected to the side of the second battery cell 22 facing away from the first battery cell. The flow direction of the fluid medium in the second flow channel 35 of the first 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 capabilities of the fluid media on both sides of the second battery cell 22 along the second direction y can be complementary, thereby reducing the difference in the local temperature of the second battery cell 22.

[0710] In some embodiments, as Figures 65 - 82 shown, at least a part of the reinforcing member 30 is configured to be deformable under pressure, so as to provide a certain expansion space for the battery cell 20 by the reinforcing member 30, which is beneficial to reducing the extrusion force between the reinforcing member 30 and the battery cell 20.

[0711] In some embodiments, as Figure 65 shown, the reinforcing member 30 includes a heat exchange layer 400 and a compressible layer 500 arranged in a stacked manner. The heat exchange layer 400 can improve the heat exchange efficiency of the battery cell 20 and enhance the heat dissipation capacity of the battery cell 20. The elastic modulus of the compressible layer 500 is less 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 generate deformation along the direction of the expansion force of the battery cell 20, thereby absorbing a part of the expansion 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 beneficial to absorbing tolerances during battery assembly, facilitating installation and maintaining the compact structure of the battery.

[0712] The heat exchange layer 400 is a layered structure for heat exchange with the battery cell 20. When the temperature of the battery cell 20 is higher than that 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 temperature of the heat exchange layer, 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.

[0713] The compressible layer 500 is a layered structure with a large compression deformation after being subjected to a force.

[0714] 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 generate a large deformation.

[0715] The elastic modulus is the proportional relationship between stress and strain of a material or structure in the elastic deformation stage. On the premise of the elastic deformation stage and the same stress, the larger the elastic modulus, the smaller the deformability of the material or structure; the smaller the elastic modulus, the larger the deformability of the material or structure.

[0716] The number of layers of the heat exchange layer 400 can be one or more, and the number of layers of the compressible layer 500 can also be one or more.

[0717] As an example, as Figure 66 shown, the reinforcing member 30 includes one layer of the heat exchange layer 400 and one layer of the compressible layer 500; as Figure 67 shown, the reinforcing member 30 includes two layers of the heat exchange layer 400 and one layer of the compressible layer 500, and the compressible layer 500 is disposed between the two layers of the heat exchange layer 400; as Figure 68 shown, the reinforcing member 30 includes one layer of the heat exchange layer 400 and two layers of the compressible layer 500, and the heat exchange layer 400 is disposed between the two layers of the compressible layer 500.

[0718] In some embodiments, the compressible layer 500 includes a compressible cavity 501, and the compressible cavity 501 is a cavity whose volume becomes smaller after the compressible layer 500 is subjected to a force.

[0719] After being subjected to the expansion force released by the battery cell 20, the gas in the compressible cavity 501 is compressed, so that the compressible layer 500 deforms along the direction of the expansion force of the battery cell 20.

[0720] In some embodiments, the compressible cavity 501 is filled with a phase change material or an elastic material.

[0721] A phase change material refers to a material that changes its physical state without changing its temperature and can provide latent heat. The process of changing physical properties is called a phase change process, and at this time, the phase change material will absorb or release a large amount of latent heat.

[0722] An elastic material refers to a material with a low elastic modulus. The elastic material can undergo large deformations under the expansion force of the battery cell.

[0723] When the compressible cavity 501 is filled with a phase change material, the heat capacity of the battery can be increased, enabling the reinforcement 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, causing the compressible layer 500 to deform along the direction of the expansion force of the battery cell 20 and rebound after the expansion force disappears. In addition, the elastic material can also increase the support strength of the compressible layer 500.

[0724] Optionally, the elastic material includes a rubber material.

[0725] In some embodiments, the heat exchange layer 400 includes a heat exchange cavity 401 (which can also be referred to as the cavity 30a described above) for accommodating a heat exchange medium. The heat exchange medium is a medium used for heat exchange with the battery cell, generally a liquid with a large specific heat capacity and capable of maintaining fluidity at the battery operating temperature, etc.

[0726] Optionally, the heat exchange cavity 401 can be sealed or open.

[0727] In some embodiments, as Figure 69 shown, a first support member 410 (which can also be referred to as the reinforcing rib described above) is provided in the heat exchange cavity 401. The first support member 410 is a structure that supports in 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 increase the strength of the heat exchange layer 400, thereby avoiding large deformations of the heat exchange layer 400 after being subjected to the expansion force released by the battery cell.

[0728] Optionally, the elastic modulus of the first support member 410 is greater than the elastic modulus of the compressible layer 500.

[0729] Since the elastic modulus of the compressible layer 500 is less than that of the first support member 410, it is more likely to deform. After the reinforcement member 30 is subjected to the expansion force released by the battery cell, the compressible layer 500 can undergo large deformations along the direction of the expansion force of the battery cell 20, while the heat exchange layer 400 basically does not deform.

[0730] In some embodiments, the heat exchange layer 400 and the compressible layer 500 are stacked in a first direction, and the first support member 410 supports in the heat exchange cavity 401 along the first direction x.

[0731] When applying the reinforcement member 30 to the battery, generally, the battery cell 20 is abutted against the reinforcement member 30 along the first direction x. Subsequently, 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 reinforcement member 30 is subjected to the expansion force along the first direction x released by the battery cell, the compressible layer 500 can generate a large deformation along the first direction x, while the heat exchange layer 400 basically does not generate deformation.

[0732] In some embodiments, referring to Figure 67 , the compressible layer 500 is disposed in the heat exchange cavity 401.

[0733] Both ends of the reinforcement member 30 in the stacking direction are heat exchange cavities 401, which can effectively improve the heat exchange efficiency of the battery cells at both ends of the reinforcement member 30 and keep the temperature of the entire battery at a relatively low level.

[0734] In some embodiments, as Figure 70 shown, a first connection structure 420 (which can also be referred to as the first reinforcing rib described above) for fixing the compressible layer 500 in the heat exchange cavity 401 is further disposed in the heat exchange cavity 401.

[0735] The first connection structure 420 is a structure with two ends respectively connected to the inner wall of the heat exchange cavity 401 and the outer wall of the compressible layer 500. The first connection structure 420 can fix the compressible layer 500 to prevent the position of the compressible layer 500 from changing relative to the heat exchange cavity 401.

[0736] Optionally, at least a part of the first connection structure 420 is disposed in the heat exchange cavity 401 along the stacking direction. The first connection structure 420 can, on the one hand, fix the compressible layer 500, and on the other hand, 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.

[0737] 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. The first connection structure 420 is disposed in the heat exchange space and divides the heat exchange space into a plurality of flow channels 402 (which can also be referred to as flow channels 30c).

[0738] The plurality of flow channels 402 are conducive to the circulation of the heat exchange medium in the heat exchange space, avoiding a relatively high temperature of a local reinforcement member 30.

[0739] Optionally, a plurality of first connection structures 420 are disposed in the heat exchange cavity 401.

[0740] Optionally, the elastic modulus of the first connection structure 420 is greater than the elastic modulus of the compressible layer 500.

[0741] In some embodiments, referring to Figures 71 - 74 , the compressible layer 500 includes a first compressible tube 510, the heat exchange layer 400 includes a first heat exchange tube 430, and the first compressible tube 510 is sleeved in the first heat exchange tube 430.

[0742] The first compressible tube 510 is a tubular structure having a compressible cavity 501 inside and capable of being extruded and deformed.

[0743] The first heat exchange tube 430 is a tubular structure having a heat exchange cavity 401 inside, and at least one first connection structure 420 is arranged in the heat exchange cavity 410. The end of at least one first connection structure 420 defines a first installation cavity 431 for setting the first compressible tube 510.

[0744] The reinforcing member 30 of the present application is formed by sleeving the first compressible tube 510 and the first heat exchange tube 430, which is beneficial to the forming of the reinforcing member 30.

[0745] Optionally, after the first compressible tube 510 and the first heat exchange tube 430 are sleeved, the end of at least one first connection structure 420 in the first heat exchange tube 430 abuts against the outer wall of the first compressible tube 510.

[0746] 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. Two first connection structures 420 extending along the third direction z are arranged in the first heat exchange tube 430, and the two first connection structures 420 are respectively arranged at both ends of the first heat exchange tube 430 along the third direction z.

[0747] Optionally, the first heat exchange tube 430 has two opposite first abutting surfaces 432 for abutting against the large surface of the battery cell, that is, the first wall 201. The first abutting surface 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.

[0748] Optionally, the first compressible tube 510 has two opposite first mating surfaces 511 for mating with the large surface of the battery cell, that is, the first wall 201. The expansion and deformation of the battery cell generally occur in the direction perpendicular to the large surface. The first mating surface 511 can be deformed under the action of the expansion force of the battery cell, so as to absorb part of the expansion of the battery cell.

[0749] In some embodiments, optionally, referring to Figure 68 , the heat exchange layer 400 is arranged in the compressible cavity 501.

[0750] Both ends of the reinforcing member 30 in the stacking direction are heat exchange cavities 401, which can effectively improve the deformation ability of the reinforcing member 30. After the reinforcing member 30 is subjected to the expansion force released by the battery cells at both ends in the stacking direction, the reinforcing member 30 can generate good deformation to absorb part of the expansion released by the battery cells.

[0751] In some embodiments, the compressible layer 500 includes a heat-conducting wall that defines a compressible cavity 501.

[0752] The heat-conducting wall is a wall structure of the compressible layer 500 with good heat-conducting effect.

[0753] As an example, the material of the heat-conducting wall can be heat-conducting silica gel, metal, etc.

[0754] The outer wall of the compressible layer 500 is a heat-conducting wall, so as to effectively conduct the heat of the battery cells to the internal heat exchange layer 400 for heat exchange.

[0755] In some embodiments, please refer to Figures 75 - 78 , Figure 75 is a schematic structural diagram of a second heat exchange tube according to some embodiments of the present application, Figure 76 is a schematic structural diagram of a second compressible tube according to some embodiments of the present application, Figure 77 is a side view of a second compressible tube according to some embodiments of the present application, Figure 78 is a schematic structural diagram of the assembled second compressible tube and second heat exchange tube according to some embodiments of the present application. The compressible layer 500 includes a second compressible tube 520, and the heat exchange layer 400 includes a second heat exchange tube 440. The second heat exchange tube 440 is sleeved in the second compressible tube 520.

[0756] The second heat exchange tube 440 is a tubular structure with a heat exchange cavity 401 inside.

[0757] The second compressible tube 520 is a tubular structure with a compressible cavity 501 inside, and is a tubular structure with at least one second connection structure 530 arranged in the compressible cavity 501. The end of at least one second connection structure 530 defines a second installation cavity 521 for arranging the second heat exchange tube 440.

[0758] The reinforcing member 30 of the present application is formed by sleeving the second compressible tube 520 and the second heat exchange tube 440, which is beneficial to the forming of the reinforcing member 30.

[0759] Optionally, after the second compressible tube 520 and the second heat exchange tube 440 are sleeved, the end of at least one second connection structure 530 in the second compressible tube 520 abuts against the outer wall of the second heat exchange tube 440.

[0760] Optionally, the reinforcement 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 in the second compressible tube 520, and the two second connecting structures 530 are respectively provided at both ends of the second compressible tube 520 along the third direction z.

[0761] Optionally, the second compressible tube 520 has two opposing second mating surfaces 522 for contacting the larger surface, i.e., the first wall 201, of the battery cell 20. The second mating surfaces 522 can increase the contact area between the second compressible tube 520 and the battery cell 20, thereby improving the heat exchange capability of the reinforcement 30 with the battery cell 20. Furthermore, since the battery cell 20 generally expands and deforms perpendicularly to the larger surface, the second mating surfaces 522 can deform under the expansion force of the battery cell 20, thereby absorbing the expansion of the battery cell 20.

[0762] Optionally, the second heat exchange tube 440 has two opposing second abutting surfaces 441 for mating with the first wall 201, the larger surface of the battery cell 20. The two second abutting surfaces 441 correspond to the two second mating surfaces 522 and absorb heat conducted from the two second mating surfaces 522.

[0763] Optionally, a plurality of second support members 450 are disposed inside the second heat exchange tube 440 .

[0764] The inner wall of the heat exchange cavity 401 defines a heat exchange space. The plurality of second support members 450 are disposed in the heat exchange space and divide the heat exchange space into a plurality of flow channels 402 .

[0765] Optionally, the elastic modulus of the second support member 450 is greater than the elastic modulus of the compressible layer 500 .

[0766] In some embodiments, see Figure 65 、 Figure 79 and Figure 80 The reinforcement 30 further includes a current collecting element 106 , which includes a liquid flow cavity 1061 . The liquid flow cavity 1061 is connected to the heat exchange cavity 401 . Both the liquid flow cavity 1061 and the heat exchange cavity 401 are sealed and isolated from the compressible cavity 501 .

[0767] The current collecting element 106 is a component that connects the heat exchange layer 400 and the container storing the heat exchange medium.

[0768] The liquid flow cavity 1061 is a cavity in the flow collecting element 106 that communicates with the heat exchange cavity 401 and the container storing the heat exchange medium.

[0769] The current collector element 106 can be used to connect a container for storing a heat exchange medium, enabling the heat exchange medium in the heat exchange chamber 401 to flow. The compressible chamber 501 is not connected to the heat exchange chamber 401, preventing the heat exchange medium from entering the compressible chamber 501 and avoiding deformation of the compressible chamber 501 caused by the expansion force released by the battery cell 20, which could lead to spillage of the heat exchange medium.

[0770] Optionally, the current collector element 106 further includes an inlet / outlet port 1062, which is connected to the liquid flow chamber 1061.

[0771] Optionally, the reinforcing member 30 includes one current collector element 106, which is disposed at one end of the heat exchange layer 400. The heat exchange layer 400 has an opening at one end, and the liquid flow chamber 1061 is connected to the heat exchange chamber 401 through the opening at one end.

[0772] Optionally, the reinforcing member 30 includes two current collector elements 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 the two liquid flow chambers 1061 are respectively connected to the heat exchange chamber 401 through the openings at both ends.

[0773] Optionally, the reinforcing member 30 further includes a connecting member, which has a hollow structure. One end of the connecting member is hermetically connected to the inlet / outlet port 1062 in a sealed manner.

[0774] Please refer to Figure 64 and 84 , Figure 81 which is a schematic structural diagram of the reinforcing member 30 and the battery cell assembly 20 after assembly for some embodiments of the present 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 two opposite surfaces of the reinforcing member 30 are respectively abutted against two adjacent large surfaces of the two adjacent battery cells 20; the reinforcing member 30 can also be disposed between the box body 10 and the battery cell 20 close to the box body 10.

[0775] Each reinforcing member 30 can be individually connected to the container for storing the heat exchange medium, or the inlet / outlet ports 1062 of adjacent reinforcing members 30 are connected through a pipeline 107.

[0776] In some embodiments, referring to Figure 65 and Figure 82 , the heat exchange layer 400 and the compressible layer 500 are arranged to 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.

[0777] The compressible layer 500 protruding from the heat exchange layer 400 is conducive to sealing off the liquid flow cavity 1061 of the current collector element 106 from the compressible cavity 501, so that the heat exchange medium cannot enter the compressible cavity 501, avoiding deformation of the compressible cavity 501 after being subjected to the expansion force released by the battery cell and causing the heat exchange medium to overflow.

[0778] Optionally, the compressible layer 500 is disposed in the heat exchange cavity 401. The current collector element 106 includes a through hole penetrating along the second direction y. The part of the compressible layer 500 protruding from the heat exchange layer 400 passes through the through hole and is hermetically connected to one end of the through hole, and the other end of the through hole is hermetically connected to the outer wall of the heat exchange layer 400. A liquid flow cavity 1061 is defined between the outer wall of the part of the compressible layer 500 protruding from the heat exchange layer 400 and the inner wall of the current collector element 106.

[0779] In some embodiments, optionally, refer to Figure 65 , the compressible cavity 501 is provided with an air inlet 502 and an air outlet 503.

[0780] The compressible layer 500 can be air-cooled through the air inlet 502 and the air outlet 503, and cooperate with the heat exchange layer 400 to further improve the heat exchange efficiency of the strengthening member 30 for the battery.

[0781] In some embodiments, as Figures 83 - 92 shown, the strengthening member 30 includes a housing 50 and a support member 60. The support member 60 is received in the housing 50 and is used to define a separately arranged cavity 30a and a deformation cavity 40a in the housing 50. The cavity 30a is used for the heat exchange medium to flow, and the deformation cavity 40a is configured to be deformable when the housing 50 is pressed.

[0782] Thus, the heat exchange medium in the cavity 30a is used to heat or cool the battery cell 20. When the battery cell 20 inside the box body 10 expands during use, since the deformation cavity 40a is provided inside the housing 50, the housing 50 can deform when subjected to the force of the battery cell 20, preventing the reaction force of the housing 50 of the strengthening member 30 on the battery cell 20 from being too large, absorbing tolerances for the battery cells 20 in a group, avoiding damage to the battery cells 20, reducing the reduction range of the heat exchange area between the strengthening member 30 and the battery cells 20, and improving the cycling performance of the battery cells 20.

[0783] The strengthening member 30 can be disposed at the bottom or side of the box body to be in full contact with the battery cells 20, or disposed between two adjacent battery cells 20.

[0784] Both ends of the cavity 30a are open for the heat exchange medium to flow through. The heat exchange medium gives the cavity 30a a certain strength and generally will not be compressed and deformed. Both ends of the deformation cavity 40a are sealed, and the heat exchange medium will not enter the deformation cavity 40a. The volume ratio of the deformation cavity 40a is 10%-90%, so it is prone to deformation. The outer shell 50 and the support member 60 can be prepared from the same material by an integral molding process, or the outer shell 50 can be made of a material with greater elasticity than the support member 60, so that when the outer shell 50 is subjected to the expansion force of the battery cell 20, the deformation cavity 40a can deform.

[0785] Optionally, the battery cell 20 is located between two adjacent reinforcing members 30, and multiple reinforcing members 30 are connected by connecting pipes to realize the connection between the respective reinforcing members 40 and the circulation of the heat exchange medium.

[0786] In some embodiments, the support member 60 and the outer shell 50 enclose to form the cavity 30a. The support member 60 can be connected to the outer shell 50 to form the cavity 30a. The number of cavities 30a can be multiple, and the multiple cavities 30a are adjacent or spaced apart to fully heat the battery cell 20.

[0787] In the above solution, the outer shell 50 is configured to be in direct contact with the battery cell 20. The cavity 30a is formed by the support member 60 and the outer shell 50 together. The heat exchange medium can contact the battery cell 20 through the outer shell 50, improving the heat exchange efficiency of the battery cell 20.

[0788] As Figure 86 and Figure 88 shown, the support member 60 includes a partition component 61 and a support component 62. The partition component 61 is used to define the cavity 30a and the deformation cavity 40a which are separated and arranged within the outer shell 50; the support component 62 is used to be arranged within the cavity 30a or jointly define the cavity 30a with the partition component 61 to support the cavity 30a.

[0789] The partition component 61 is connected to the support component 62 and is respectively connected to the outer shell 50 to define the cavity 30a and the deformation cavity 40a. The support component 62 can be arranged inside the cavity 30a to support the cavity 30a, or the support component 62 serves as the side of the cavity 30a and is connected to the outer shell 50 and the partition component 61 to enclose and form the cavity 30a, which can also realize the support of the cavity 30a.

[0790] In the above solution, the interior of the housing 50 is divided into a cavity 30a and a deformation cavity 40a by a separating component 61. The cavity 30a is supported by a supporting component 62, which improves the strength of the cavity 30a. When the reinforcing member 30 absorbs expansion and tolerances, it prevents the volume inside the cavity 30a from decreasing, the flow rate of the heat exchange medium inside the cavity 30a from changing, and the heat exchange medium from overflowing. At the end of the battery life cycle, the cavity 30a will not be crushed and blocked.

[0791] The housing 50 includes a first side wall 50a (for example, which can also be referred to as the first heat conducting plate 3331 described above) and a second side wall 50b (for example, which can also be referred to as the second heat conducting plate 3332 described above). The second side wall 50b is disposed opposite to the first side wall 50a along the first direction x (which can be the thickness direction of the reinforcing member 30), and the separating component 61 is connected to the first side wall 50a and the second side wall 50b respectively.

[0792] The first side wall 50a and the second side wall 50b can be configured as the side walls with the largest area of the reinforcing member 30. The reinforcing member 30 can be disposed at the bottom or side of the box body 10. The first side wall 50a or the second side wall 50b contacts the battery cell 20 to fully exchange heat with the battery cell 20; the reinforcing member 30 can also be disposed between two adjacent battery cells 20, and the first side wall 50a and the second side wall 50b contact two adjacent battery cells 20 respectively to be able to exchange heat with different battery cells 20 and improve the heat exchange efficiency of the battery.

[0793] In the above solution, by connecting the separating component 61 (for example, which can also be referred to as the first reinforcing rib described above) to the first side wall 50a and the second side wall 50b respectively, the connection strength between the first side wall 50a and the second side wall 50b can be enhanced, and the overall strength of the thermal management component 40 can be improved.

[0794] As Figure 89 and Figure 90 shown, the separating component 61 includes a first bent plate 611 and a second bent plate 612. The first bent plate 611 is connected to the first side wall 50a; the second bent plate 612 is connected to the second side wall 50b, and the first bent plate 611 and the second bent plate 612 define the deformation cavity 40a.

[0795] The first bent plate 611 is connected to the first side wall 50a, which can define the deformation cavity 40a close to the first side wall 50a. The second bent plate 612 is connected to the second side wall 50b, which can define the deformation cavity 40a close to the second side wall 50b; or the deformation cavity 40a is formed between the first bent plate 611 and the second bent plate 612.

[0796] In the above solution, both the first bending plate 611 and the second bending plate 612 have a bent shape. The first bending plate 611 and the second bending plate 612 can define a deformation cavity 40a with a relatively large space, ensuring the deformation space of the reinforcement 30 and improving the space utilization rate inside the housing 50.

[0797] In some embodiments, the support assembly 62 includes a first support rib 621 and a second support rib 622. The first support rib 621 is respectively connected to the first bending plate 611 and the second side wall 50b; the second support rib 622 is respectively connected to the second bending plate 612 and the first side wall 50a.

[0798] The first support rib 621 and the second support rib 622 can be respectively located inside the cavity 30a or can be used as the sides of the cavity 30a, both of which can support the cavity 30a. The first support rib 621 improves the connection strength between the first bending plate 611 and the housing 50, and the second support rib 622 improves the connection strength between the second bending plate 612 and the housing 50. Moreover, both the first support rib 621 and the second support rib 622 improve the strength of the cavity 30a. When the reinforcement 30 is compressed by the expansion force of the battery cell 20, the first support rib 621 and the second support rib 622 can keep 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 end of the battery life cycle, it can prevent the cavity 30a from being crushed and blocked, resulting in thermal performance failure.

[0799] In the embodiments such as Figure 90 and Figure 91 shown, both ends of the first bending plate 611 are connected to the first side wall 50a, and both ends of the second bending plate 612 are connected to the second side wall 50b; in the first direction X, the first bending plate 611 and the second bending plate 612 are arranged in a staggered manner, and a cavity 30a is formed between the first support rib 621 and the second support rib 622.

[0800] The first bending plate 611 is connected to the first side wall 50a to form a deformation cavity 40a adjacent to the first side wall 50a. The second bending plate 612 is connected to the second side wall 50b to form a deformation cavity 40a adjacent to the second side wall 50b. The cavity 30a is located between the two deformation cavities 40a. A plurality of cavities 30a are arranged adjacent to each other. 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 side wall 50a and the second side wall 50b can be respectively used to contact two adjacent battery cells 20, so that the positions of the deformation cavities 40a corresponding to the first side wall 50a and the second side wall 50b can d...

Claims

1. A battery, characterized in that, Comprising: A box body having a receiving cavity; A battery cell received in the receiving cavity, the battery cell including an electrode assembly and an electrode terminal, the electrode assembly being electrically connected to the electrode terminal, the battery cell including a first wall, the first wall being the wall with the largest area in the battery cell; A busbar component connected to the electrode terminal; A reinforcing member disposed opposite to the first wall, the reinforcing member being fixedly connected to the first wall and thermally connected to the first wall; The reinforcing member is a heat-conducting member for exchanging heat with the battery cell, and a cavity is provided in the heat-conducting member for accommodating a heat-exchanging medium to adjust the temperature of the battery cell.

2. The battery according to claim 1, wherein The battery cell further includes a second wall connected to the first wall, the first wall and the second wall intersecting, and the electrode terminal is disposed on the second wall.

3. The battery according to claim 2, wherein The battery cell includes two relatively disposed first walls and two relatively disposed second walls, and the electrode terminals are provided as at least two; At least two of the electrode terminals are disposed on the same second wall; or, at least one of the electrode terminals is provided on each second wall.

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

5. The battery according to claim 4, characterized in that, There are multiple battery cells arranged in a first direction. In the first direction, each battery cell has a first surface disposed opposite to the first wall, and an avoidance groove is provided on the first surface. The avoidance groove of one of the adjacent two battery cells is used to accommodate the electrode terminal of the other battery cell, and the first direction is perpendicular to the first wall.

6. The battery according to claim 1, wherein The first wall is formed in a cylindrical shape.

7. The battery according to claim 6, characterized in that, Second walls are provided at both axial ends of the first wall, and at least one of the second walls is provided with the electrode terminal.

8. The battery according to claim 7, characterized in that, One of the second walls is provided with an exposed electrode terminal. The electrode assembly includes a positive electrode plate and a negative electrode plate. One of the positive electrode plate and the negative electrode plate is electrically connected to the electrode terminal, and the other of the positive electrode plate and the negative electrode plate is electrically connected to the first wall or another second wall.

9. The battery according to claim 1, characterized in that, At least one of the battery cells is a soft-pack battery cell.

10. The battery according to claim 1, characterized in that, The battery cell further includes a pressure relief mechanism, and the pressure relief mechanism and the electrode terminal are disposed on the same wall of the battery cell.

11. The battery according to claim 1, wherein The battery cell further includes a pressure relief mechanism, and the pressure relief mechanism and the electrode terminal are respectively disposed on two walls of the battery cell.

12. The battery according to claim 1, wherein, The reinforcing member is bonded to the first wall through 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 through a second adhesive layer; and / or The bottom of the battery cell is bonded to the bottom wall of the receiving cavity through a third adhesive layer.

14. The battery according to claim 13, characterized in that, The thickness of the first adhesive layer is less than or equal to the thickness of the second adhesive layer; and / or The thickness of the first adhesive layer is less than or equal to the thickness of the third adhesive layer.

15. The battery according to claim 13, characterized in that, The thermal conductivity of the first adhesive layer is greater than or equal to the thermal conductivity of the second adhesive layer; and / or The thermal conductivity of the first adhesive layer is greater than or equal to the thermal conductivity of the third adhesive layer.

16. The battery according to claim 13, wherein, The ratio between the thickness and the thermal conductivity of the first adhesive layer is a first ratio; the ratio between the thickness and the thermal conductivity of the second adhesive layer is a second ratio; the ratio between the thickness 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 heat conducting member includes a metal material and / or a non-metal material.

18. The battery according to claim 17, characterized in that, The heat conducting member includes a metal plate and an insulating layer, and the insulating layer is disposed on the surface of the metal plate; or The heat conducting member is a non-metal material plate.

19. The battery according to any one of claims 1-16, characterized in that, There are multiple battery cells arranged along a second direction; The reinforcing member includes a partition plate, the partition plate extends along the second direction and is connected to the first wall of each of the multiple battery cells, and the second direction is parallel to the first wall.

20. The battery according to claim 19, wherein The reinforcing member further includes an insulating layer, and the insulating layer is used for insulating and isolating the first wall of the battery cell and the partition plate.

21. The battery according to claim 20, wherein The thermal conductivity of the insulating layer is greater than or equal to 0.1 W / (m•K).

22. The battery according to claim 19, characterized in that, The dimension T1 of the partition plate in a first direction perpendicular to the first wall is less than 0.5 mm.

23. The battery according to claim 19, wherein, The dimension T1 of the partition plate in a first direction perpendicular to the first wall is greater than 5 mm.

24. The battery according to claim 19, wherein, The surface of the reinforcing member connected to the first wall is an insulating surface; wherein, the dimension of the reinforcing member in the first direction perpendicular to the first wall is 0.1 mm to 100 mm.

25. The battery according to claim 19, characterized in that, In a third direction perpendicular to the second direction and parallel to the first wall, the dimension H1 of the partition plate and the dimension H2 of the first wall satisfy: 0.1 ≤ H1 / H2 ≤ 2.

26. The battery according to claim 19, wherein A cavity is provided inside the partition plate.

27. The battery according to claim 26, wherein, The cavity is used to accommodate a heat exchange medium to adjust the temperature of the battery cell.

28. The battery according to claim 26, characterized in that, In a first direction perpendicular to the first wall, the dimension of the cavity is W, and the capacity Q of the battery cell and the dimension W of the cavity satisfy: 1.0 Ah / mm ≤ Q / W ≤ 400 Ah / mm.

29. The battery according to claim 27, wherein, The partition plate further includes a pair of heat conducting plates oppositely arranged along the first direction, and the cavity is disposed between the pair of heat conducting plates, and the first direction is perpendicular to the first wall.

30. The battery according to claim 29, wherein, The partition plate further includes reinforcing ribs, and the reinforcing ribs are disposed between the pair of heat conducting plates.

31. The battery according to claim 30, wherein, The reinforcing ribs are connected to at least one of the pair of heat conducting plates.

32. The battery according to claim 31, wherein The reinforcing ribs include a first reinforcing rib, and two ends of the first reinforcing rib are respectively connected to the pair of heat conducting plates, and the first reinforcing rib is inclined with respect to the first direction.

33. The battery according to claim 32, characterized in that, The included angle range between the first reinforcing rib and the first direction is 30° - 60°.

34. The battery according to claim 32, wherein, The reinforcing ribs further include a second reinforcing rib, one end of the second reinforcing rib is connected to one of the pair of heat conducting plates, and the other end of the second reinforcing rib is spaced from the other of the pair of heat conducting plates.

35. The battery according to claim 34, wherein, The second reinforcing rib extends along the first direction and protrudes from one of the pair of heat conducting plates.

36. The battery according to claim 34, wherein, The first reinforcing rib and the second reinforcing rib are spaced apart.

37. The battery according to claim 29, wherein, 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.

38. The battery according to claim 27, wherein, The partition is provided with a medium inlet and a medium outlet. The cavity communicates with the medium inlet and the medium outlet. A cavity that is disconnected from both the medium inlet and the medium outlet is provided inside the partition.

39. The battery according to claim 26, wherein, A partition member is provided in the cavity. The partition member is used to divide the cavity into at least two flow channels.

40. The battery according to claim 39, characterized in that, The reinforcing member includes a first heat conducting plate, a second heat conducting plate, and the partition member that are stacked. The partition member is disposed between the first heat conducting plate and the second heat conducting plate. The first heat conducting plate and the partition member jointly define a first flow channel, and the second heat conducting plate and the partition member jointly define a second flow channel.

41. The battery according to any one of claims 1-16, characterized in that, At least a part of the reinforcing member is configured to be deformable when compressed.

42. The battery according to claim 41, characterized in that, The reinforcing member includes: A heat exchange layer and a compressible layer that are arranged in a stacked manner; The elastic modulus of the compressible layer is less than the elastic modulus of the heat exchange layer.

43. The battery according to claim 42, characterized in that, The compressible layer includes a compressible cavity, and the compressible cavity is filled with a phase change material or an elastic material.

44. The battery according to claim 41, characterized in that, The reinforcing member includes a housing and a support member. The support member is accommodated in the housing and is used to define a cavity and a deformation cavity that are separately arranged in the housing. The cavity is used for the heat exchange medium to flow through, and the deformation cavity is configured to be deformable when the housing is compressed.

45. The battery according to claim 41, wherein, The reinforcing member includes a housing and an isolation assembly. The isolation assembly is accommodated in the housing and is connected to the housing to form a cavity between the housing and the isolation assembly. The cavity is used for the heat exchange medium to flow through, and the isolation assembly is configured to be deformable when the housing is compressed.

46. The battery according to any one of claims 1-16, characterized in that, The reinforcing member is provided with an avoidance structure, and the avoidance structure is used to provide space for the expansion of the battery cell.

47. The battery according to claim 46, wherein, A plurality of battery cells are provided. At least a part of the avoidance structure is located between two adjacent battery cells and is used to provide space for the expansion of at least one battery cell.

48. The battery according to claim 46, characterized in that, In the first direction, the reinforcing member includes a first heat conducting plate and a second heat conducting plate that are oppositely arranged. A cavity is provided between the first heat conducting plate and the second heat conducting plate. The cavity is used to accommodate the 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.

49. The battery according to any one of claims 1-16, characterized in that, A battery pack is provided in the box body. The number of the battery packs is two or more and they are arranged along the first direction. Each battery pack includes two or more battery cells arranged along the second direction. The second direction is perpendicular to the first direction, and the first direction is perpendicular to the first wall.

50. The battery according to claim 49, wherein, The reinforcing member is clamped between two adjacent battery packs.

51. The battery according to claim 50, characterized in that, It further includes a connecting pipe group. A cavity for accommodating the heat exchange medium is provided in the reinforcing member. The connecting pipe group is used to connect the cavities of two or more reinforcing members.

52. The battery according to claim 51, characterized in that, The connecting pipe group includes a connecting channel, an inlet pipe, and an outlet pipe. Along the first direction, the cavities of two adjacent ones of the reinforcing members are communicated through the connecting channel, and the inlet pipe and the outlet pipe are communicated with the cavity of the same reinforcing member.

53. The battery according to any one of claims 1-16, characterized in that, The battery cell further includes a battery case, the electrode assembly is accommodated in the battery case, the battery case is provided with a pressure relief mechanism, and the pressure relief mechanism is integrally formed with the battery case.

54. The battery according to claim 53, characterized in that, The battery case includes a non-weak area and a weak area which are integrally formed. The battery case is provided with a groove portion. The non-weak area is formed around the groove portion, and the weak area is formed at the bottom of the groove portion. The weak area is configured to be damaged when the battery cell discharges internal pressure, and the pressure relief mechanism includes the weak area.

55. The battery according to claim 54, characterized in that, The average grain size of the weak area is S1, and the average grain size of the non-weak area is S2, satisfying: 0.05 ≤ S1 / S2 ≤ 0.

9.

56. The battery according to claim 55, wherein, The minimum thickness of the weak area is A1, satisfying: 1 ≤ A1 / S1 ≤ 100.

57. The battery according to claim 54, characterized in that, The minimum thickness of the weak area is A1, and the hardness of the weak area is B1, satisfying: 5 HBW / mm ≤ B1 / A1 ≤ 10000 HBW / mm.

58. The battery according to claim 54, wherein, 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 claim 54, wherein, The minimum thickness of the weak area is A1, and the minimum thickness of the non-weak area is A2, satisfying: 0.05 ≤ A1 / A2 ≤ 0.

95.

60. The battery according to any one of claims 1 to 16, characterized in that, The electrode assembly includes a positive electrode sheet and a negative electrode sheet. The positive electrode sheet and / or the negative electrode sheet includes a current collector and an active material layer. The current collector includes a support layer and a conductive layer. The support layer is used for carrying the conductive layer, and the conductive layer is used for carrying the active material layer.

61. The battery according to claim 60, wherein 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 normal temperature thin film resistance RS of the conductive layer satisfies: 0.016 Ω / square ≤ RS ≤ 420 Ω / square.

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

64. The battery according to claim 60, wherein, The material of the support layer includes one or more of polymer materials and polymer matrix composites.

65. The battery according to claim 60, wherein The thickness d1 of the support layer and the light transmittance k of the support layer satisfy: When 12 μm ≤ d1 ≤ 30 μm, 30% ≤ k ≤ 80%; or, When 8 μm ≤ d1 < 12 μm, 40% ≤ k ≤ 90%; or, When 1 μm ≤ d1 < 8 μm, 50% ≤ k ≤ 98%.

66. 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 electrode current collector and a positive electrode active material layer coated on the surface of the positive electrode current collector. The positive electrode active material layer includes a positive electrode active material. The positive electrode active material has a core and a shell covering the core. The core includes at least one of ternary materials, dLi2MnO3∙(1 - d)LiMO2, and LiMPO4, 0 < d < 1, and M includes one or more selected from Fe, Ni, Co, and Mn. The shell contains crystalline inorganic substances, the full width at half maximum of the main peak measured by X-ray diffraction of the crystalline inorganic substances is 0-3°, and the crystalline inorganic substances include one or more selected from metal oxides and inorganic salts.

67. The battery according to claim 66, wherein, The shell includes 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 electrode current collector and a positive electrode active material layer coated on the surface of the positive electrode current collector, the positive electrode active material layer includes a positive electrode active material, the positive electrode active material has LiMPO4, M includes Mn, and non-Mn elements, and the non-Mn elements satisfy at least one of the following conditions: The ionic radius of the non-Mn element is a, the ionic radius of the manganese element is b, and |a - b| / b is not greater than 10%; The variable valence voltage of the non-Mn element is U, and 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.

69. The battery according to claim 68, characterized in that, 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.

70. The battery according to claim 69, characterized in that, The first doping element satisfies at least one of the following conditions: The ionic radius of the first doping element is a, the ionic radius of the manganese element is b, and |a - b| / b is not greater than 10%; The variable valence voltage of the first doping element is U, and 2V < U < 5.5V.

71. The battery according to claim 69, characterized in that, The second doping element satisfies at least one of the following conditions: The chemical activity of the chemical bond formed by the second doping element and O is not less than the chemical activity of the P-O bond; The highest valence of the second doping element is not greater than 6.

72. The battery according to claim 68, wherein, The positive electrode active material also has a coating layer.

73. The battery according to claim 72, characterized in that, The coating layer includes carbon.

74. The battery according to claim 73, characterized in that, The carbon in the coating layer is a mixture of SP2 form carbon and SP3 form carbon.

75. The battery according to claim 74, characterized in that, The molar ratio of the SP2 form carbon to the SP3 form carbon is any value within the range of 0.1-10.

76. An electrical device, characterized in that, Including the battery according to any one of claims 1-75, the battery is used to provide electrical energy.

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