Batteries and electrical devices

Abstract

As a battery and an electric device, the battery comprises a box body, at least two battery cells, and a heat-conducting member for accommodating a heat exchange medium, wherein at least two battery cells are accommodated within a receiving chamber of the box body, and an electrode assembly of each battery cell is electrically connected to an electrode terminal, and each battery cell includes a first wall having the largest area among the battery cells, and the heat-conducting member is connected to at least two battery cells, and the heat-conducting member is installed opposite to the first wall of at least two battery cells, and the heat-conducting member is thermally connected to the first wall of at least two battery cells, thereby controlling the temperature of at least two battery cells using a heat exchange medium.

Description

Technology Field

[0001] Cross-reference of related applications

[0002] The present application is an international patent application with application number PCT / CN2022 / 077152 and a filing date of February 21, 2022; an international patent application with application number PCT / CN2022 / 077153 and a filing date of February 21, 2022; an international patent application with application number PCT / CN2022 / 077151 and a filing date of February 21, 2022; an international patent application with application number PCT / CN2022 / 077147 and a filing date of February 21, 2022; an international patent application with application number PCT / CN2022 / 077149 and a filing date of February 21, 2022; and an international application with application number PCT / CN2022 / 077150 and a filing date of February 21, 2022 Patent application, international patent application with application number PCT / CN2022 / 098447 and filing date June 13, 2022, international patent application with application number PCT / CN2022 / 098727 and filing date June 14, 2022, international patent application with application number PCT / CN2022 / 099229 and filing date June 16, 2022, international patent application with application number PCT / CN2022 / 100488 and filing date June 22, 2022, international patent application with application number PCT / CN2022 / 100486 and filing date June 22, 2022, international patent application with application number PCT / CN2022 / 111347 and filing date August 10, 2022 It is submitted based on the patent application, the international patent application with application number PCT / CN2022 / 099786 and filing date June 20, 2022, the international patent application with application number PCT / CN2022 / 101392 and filing date June 27, 2022, and the international patent application with application number PCT / CN2022 / 101395 and filing date June 27, 2022, and also claims priority to the international patent application mentioned above, the entire contents of the international patent application mentioned above are incorporated herein by reference.

[0003] This application relates to battery technology, and in particular to batteries and electric devices. Background Technology

[0004] In recent years, new energy vehicles have made rapid progress, and in the field of electric vehicles, power batteries are playing an irreplaceable and important role as the power source for electric vehicles.

[0005] While battery energy density is a critical parameter of performance, other performance aspects, such as thermal management, must also be considered when improving energy density. Therefore, determining how to enhance both energy density and thermal management performance is an urgent technical challenge that must be addressed in battery technology.

[0006] The present application aims to solve at least one of the technical problems existing in the relevant technology. Accordingly, the present application presents a battery capable of effectively ensuring heat transfer within the battery, thereby improving the thermal management performance of the battery, while simultaneously improving the energy density of the battery.

[0007] The present application further provides an electric device having the battery described above.

[0008] A battery according to an embodiment of the first aspect of the present application comprises a box body, at least two battery cells, and a heat-conducting member for accommodating a heat exchange medium, wherein the box body comprises a receiving chamber; the at least two battery cells are accommodated within the receiving chamber, and each of the battery cells comprises an electrode assembly and an electrode terminal that are electrically connected, and each of the battery cells comprises a first wall which is the wall with the largest area among the battery cells; the heat-conducting member is connected to at least two battery cells, and the heat-conducting member is installed opposite to the first wall of at least two battery cells, and the heat-conducting member is thermally connected to the first wall of at least two battery cells, thereby controlling the temperature of at least two battery cells using the heat exchange medium.

[0009] A battery according to an embodiment of the present application does not require additional structures such as beams to be installed in a box body accommodating at least two battery cells, thereby greatly improving the space utilization inside the battery and improving the energy density of the battery; at the same time, by using a thermal conductive member to ensure heat conduction within the battery, the thermal management performance of the battery can be improved.

[0010] In some embodiments, each of the above-mentioned battery cells further comprises a second wall connected to the first wall, the first wall being installed intersecting the second wall, and the electrode terminal being installed on the second wall.

[0011] In some embodiments, each of the above-mentioned battery cells includes two of the above-mentioned first walls and two of the above-mentioned second walls installed opposite each other, and the electrode terminals are installed in at least two places; at least two of the electrode terminals are installed on the same of the above-mentioned second walls; or, at least one of the electrode terminals is installed on each of the above-mentioned second walls.

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

[0013] In some embodiments, at least two of the battery cells are arranged and installed in a first direction, and in the first direction, each of the battery cells is provided with a first surface installed opposite to the first wall, and a yielding groove is provided on the first surface, and the yielding groove of one of the two adjacent battery cells is used to receive 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, a second wall is installed at both axial ends of the first wall, and the electrode terminal is installed on at least one of the second walls.

[0016] In some embodiments, the exposed electrode terminal is installed on one of the second walls, and the electrode assembly comprises an anode sheet and a cathode sheet, one of the anode sheet and the cathode sheet is electrically connected to the electrode terminal, and the other of the anode sheet and the cathode sheet is electrically connected to the first wall or the other of the second wall.

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

[0018] In some embodiments, each of the above-mentioned battery cells further includes a pressure relief mechanism, and the pressure relief mechanism and the electrode terminal are installed on the same wall of the battery cell.

[0019] In some embodiments, each of the above-mentioned battery cells further includes a pressure relief mechanism, and the pressure relief mechanism and the electrode terminals are each installed on two walls of the above-mentioned battery cell.

[0020] In some embodiments, the heat-conducting member is adhered to the first wall of at least two battery cells through a first adhesive layer.

[0021] In some embodiments, the bottom portion of the heat-conducting member is bonded to the bottom wall of the receiving chamber through a second adhesive layer; and / or, the bottom portion of the battery cell is bonded to the bottom wall of the receiving chamber 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 between the thickness of the first adhesive layer and the thermal conductivity of the first adhesive layer is a first ratio, the ratio between the thickness of the second adhesive layer and the thermal conductivity of the second adhesive layer is a second ratio, and the ratio between the thickness of the third adhesive layer and the thermal conductivity of the third adhesive layer is a third ratio, 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 heat-conducting member comprises a metal material and / or a non-metal material.

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

[0027] In some embodiments, the battery cells are plurality and arranged along a second direction; the heat-conducting member includes a separator extending along the second direction and connected to the first wall of each battery cell among the plurality of battery cells, and the second direction is parallel to the first wall.

[0028] In some embodiments, the heat-conducting member further includes an insulating layer for insulating and isolating the first wall of the battery cell and the separator.

[0029] In some embodiments, the thermal conductivity of the insulating layer is 0.1 W / (m·K) or higher.

[0030] In some embodiments, the dimension T1 in the first direction of the separator plate is smaller than 0.5 mm, and the first direction is perpendicular to the first wall.

[0031] In some embodiments, the dimension T1 in the first direction of the separator plate is greater than 5 mm, and the first direction is perpendicular to the first wall.

[0032] In some embodiments, the surface connected to the first wall in the heat-conducting member is an insulating surface, and the dimension in the first direction of the heat-conducting member is 0.1 to 100 mm, and the first direction is perpendicular to the first wall.

[0033] In some embodiments, in the third direction, the dimension H1 of the separator and the dimension H2 of the first wall satisfy 0.1≤H1 / H2≤2, and the third direction is perpendicular to the second direction and parallel to the first wall.

[0034] In some embodiments, a hollow cavity is installed inside the separator plate.

[0035] In some embodiments, the hollow cavity is used to accommodate a heat exchange medium for controlling the temperature of the battery cell.

[0036] In some embodiments, in the first direction, the dimension of the hollow cavity is W, and the capacity Q of the battery cell and the dimension W of the hollow cavity satisfy 1.0 Ah / mm ≤ Q / W ≤ 400 Ah / mm, and the first direction is perpendicular to the first wall.

[0037] In some embodiments, the separator further comprises a pair of heat conduction plates installed oppositely along a first direction, the hollow cavity installed between the pair of heat conduction plates, and the first direction is perpendicular to the first wall.

[0038] In some embodiments, the separator further includes a reinforcing rib installed between the pair of heat conduction plates.

[0039] In some embodiments, the reinforcing rib is connected to at least one of the pair of heat conduction plates.

[0040] In some embodiments, the reinforcing rib includes a first reinforcing rib having both ends connected to the pair of heat conduction plates, and the first reinforcing rib is installed at an angle with respect to the first direction.

[0041] In some embodiments, the angle of insertion between the first reinforcing rib and the first direction is 30° to 60°.

[0042] In some embodiments, the reinforcing rib further comprises a second reinforcing rib, one end of the second reinforcing rib is connected to one of the pair of heat conduction plates, and the other end of the second reinforcing rib is spaced apart from the other of the pair of heat conduction plates.

[0043] In some embodiments, the second reinforcing rib extends along the first direction and protrudes from one of the pair of heat conduction plates.

[0044] In some embodiments, the first reinforcing rib and the second reinforcing rib are installed spaced apart.

[0045] In some embodiments, in the first direction, the thickness D of the heat conduction plate and the dimension W of the hollow cavity satisfy 0.01≤D / W≤25.

[0046] In some embodiments, the separator plate is provided with a media inlet and a media outlet, the hollow cavity is connected to the media inlet and the media outlet, and a cavity separated from both the media inlet and the media outlet is provided inside the separator plate.

[0047] In some embodiments, a separating member is installed within the hollow cavity, and the separating member is used to separate the interior of the hollow cavity to form at least two flow paths.

[0048] In some embodiments, the heat conducting member comprises a first heat conducting plate, a second heat conducting plate, and a separating member installed in a stacked manner, wherein the separating member is installed between the first heat conducting plate and the second heat conducting plate, and the first heat conducting plate and the separating member jointly define a first flow path, and the second heat conducting plate and the separating member jointly define a second flow path.

[0049] In some embodiments, at least a portion of the heat-conducting member is configured to be deformable when pressurized.

[0050] In some embodiments, the heat-conducting member comprises a stacked heat exchange layer and a compressible layer, wherein the elastic modulus of the compressible layer is smaller than the elastic modulus of the heat exchange layer.

[0051] In some embodiments, the compressible layer includes a compressible chamber filled with a phase change material or an elastic material.

[0052] In some embodiments, the heat-conducting member comprises a housing and a support member, the support member is used to define a hollow cavity and a deformable cavity that are received within the housing and installed separately within the housing, the hollow cavity is used to allow a heat exchange medium to flow, and the deformable cavity is configured to be deformable when the housing is pressurized.

[0053] In some embodiments, the heat-conducting member comprises a housing and an isolation assembly, wherein the isolation assembly is accommodated within the housing and connected to the housing to form a hollow cavity between the housing and the isolation assembly, wherein the hollow cavity is used to allow a heat exchange medium to flow, and wherein the isolation assembly is configured to be deformable when the housing is pressurized.

[0054] In some embodiments, the heat-conducting member is provided with a yield structure to provide space for the expansion of the battery cell.

[0055] In some embodiments, the battery cells are installed in multiple numbers, and at least a portion of the yield structure is located between two adjacent battery cells and is also used to provide space for the expansion of at least one battery cell.

[0056] In some embodiments, in a first direction, the heat conducting member comprises a first heat conducting plate and a second heat conducting plate installed opposite each other, and a hollow cavity for receiving a heat exchange medium is installed between the first heat conducting plate and the second heat conducting plate, and along the first direction, at least one of the first heat conducting plate and the second heat conducting plate is installed concavely toward a direction adjacent to the other to form the yield structure, and the first direction is perpendicular to the first wall.

[0057] In some embodiments, a battery pack is installed within the box body, and the battery pack has two or more units arranged along a first direction, and each battery pack includes two or more battery cells arranged along a second direction, the second direction is perpendicular to the first direction, and the first direction is perpendicular to the first wall.

[0058] In some embodiments, the heat-conducting member is clamped between two adjacent groups of the battery packs.

[0059] In some embodiments, the battery further comprises a connecting pipe assembly, and a hollow cavity for receiving a heat exchange medium is installed within the heat-conducting member, and the connecting pipe assembly is used to connect the hollow cavities of two or more of the heat-conducting members.

[0060] In some embodiments, the connecting pipe assembly includes a connecting passage, an inlet pipe and an outlet pipe, and along the first direction, the hollow cavities of two adjacent heat-conducting members are connected through the connecting passage, and the inlet pipe and the outlet pipe are connected to the hollow cavities of the same heat-conducting member.

[0061] In some embodiments, each of the above-mentioned battery cells further comprises a battery box containing an electrode assembly inside, and the battery box is equipped with a pressure relief mechanism formed integrally with the battery box.

[0062] In some embodiments, the battery box comprises a non-vulnerable area and a vulnerable area formed integrally, and a groove is installed in the battery box, the non-vulnerable area is formed around the groove, the vulnerable area is formed at the bottom of the groove, and the vulnerable area is configured to be destroyed when the battery cell releases internal pressure, and the pressure release mechanism includes the vulnerable area.

[0063] In some embodiments, the average grain size of the brittle region is S1, the average grain size of the non-brittle region is S2, and 0.05≤S1 / S2≤0.9 is satisfied.

[0064] In some embodiments, the minimum thickness of the vulnerable area is A1, satisfying 1≤A1 / S1≤100.

[0065] In some embodiments, the minimum thickness of the vulnerable area is A1, the hardness of the vulnerable area is B1, and 5 HBW / mm ≤ B1 / A1 ≤ 10000 HBW / mm is satisfied.

[0066] In some embodiments, the hardness of the vulnerable area is B1, the hardness of the non-vulnerable area is B2, and 1 <B1 / B2≤5를 충족한다.

[0067] In some embodiments, the minimum thickness of the vulnerable area is A1, the minimum thickness of the non-vulnerable area is A2, and 0.05 ≤ A1 / A2 ≤ 0.95 is satisfied.

[0068] In some embodiments, the electrode assembly comprises an anode sheet and a cathode sheet, wherein the anode sheet and / or the cathode sheet comprises a current collector and an active material layer, and the current collector comprises a support layer and a conductive layer, wherein the support layer is used to bear the conductive layer and the conductive layer is used to bear the active material layer.

[0069] In some embodiments, along the thickness direction of the support layer, the conductive layer is installed on at least one side of the support layer.

[0070] In some embodiments, the room temperature thin film resistance R of the conductive layer S is 0.016Ω / □≤R S Satisfies ≤420Ω / □.

[0071] In some embodiments, the material of the conductive layer is at least one selected from aluminum, copper, titanium, silver, nickel-copper alloy and aluminum-zirconium alloy.

[0072] In some embodiments, the material of the support layer comprises one or more of a polymer material and a polymer-based composite material.

[0073] In some embodiments, the thickness d1 of the support layer and the light transmittance k of the support layer satisfy 30% ≤ k ≤ 80% when 12 μm ≤ d1 ≤ 30 μm; or 40% ≤ k ≤ 90% when 8 μm ≤ d1 < 12 μm; or 50% ≤ k ≤ 98% when 1 μm ≤ d1 < 8 μm.

[0074] In some embodiments, the electrode assembly comprises an anode sheet, wherein the anode sheet comprises an anode current collector and a positive active material layer coated on the surface of the anode current collector, wherein the positive active material layer comprises a positive active material, and wherein the positive active material comprises an inner core and a shell covering the inner core, and wherein the inner core is a ternary material, dLi2MnO 3· (1-d) at least one of LiMO2 and LiMPO4, 0 < d < 1, wherein M comprises one or more selected from Fe, Ni, Co, and Mn, wherein the shell comprises a crystalline inorganic material, wherein the full width at half maximum of the main peak of the crystalline inorganic material measured by X-ray diffraction is 0 to 3°, and wherein the crystalline inorganic material comprises one or more selected from metal oxides and inorganic salts.

[0075] In some embodiments, the shell comprises at least one of the metal oxide and the inorganic salt, and carbon.

[0076] In some embodiments, the electrode assembly comprises an anode sheet, the anode sheet comprises an anode current collector and an anode active material layer coated on the surface of the anode current collector, the anode active material layer comprises an anode active material, the anode active material comprises LiMPO4, the M comprises 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 |ab| / b is 10% or less; and the valence conversion voltage of the non-Mn element is U and 2V <U<5.5V이고; 상기 비 Mn 원소와 O에 의해 형성된 화학 결합의 화학 활성은 P-O 결합의 화학 활성 이상이며; 상기 비 Mn 원소의 최고 원자가는 6 이하이다.

[0077] In some embodiments, the non-Mn element comprises one or both of a first doping element and a second doping element, wherein the first doping element is a manganese site doping and the second doping element is an in site doping.

[0078] 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 |ab| / b is 10% or less; and the valence conversion voltage of the first doping element is U and 2V <U<5.5V이다.

[0079] In some embodiments, the second doping element satisfies at least one of the following conditions: the chemical activity of the chemical bond formed by the second doping element and O is greater than or equal to the chemical activity of the PO bond; and the maximum valence of the second doping element is 6 or less.

[0080] In some embodiments, the positive active material further comprises a coating layer.

[0081] In some embodiments, the coating layer contains carbon.

[0082] In some embodiments, the carbon in the coating layer is a mixture of SP2-type carbon and SP3-type carbon.

[0083] In some embodiments, the molar ratio of the SP2 form carbon and the SP3 form carbon is any value within the range of 0.1 to 10.

[0084] An electric device according to an embodiment of the second aspect of the present application includes a battery according to an embodiment of the first aspect of the present application described above, which is used to provide electric energy.

[0085] Additional aspects and advantages of the present application are provided in part in the following description, some of which become clear from the following description or are understood through the practice of the present application. Brief explanation of the drawing

[0086] The above description and / or additional aspects and advantages of the present application become clear and easy to understand from the description of the embodiments in combination with the following drawings. FIG. 1 is a schematic diagram of an electric device according to one embodiment of the present application. FIG. 2 is an exploded view of a battery according to one embodiment of the present application. FIG. 3 is an exploded view of a battery according to another embodiment of the present application. FIG. 4 is an exploded view of a battery cell according to one embodiment of the present application. Figure 5 is a schematic diagram of the battery cell shown in Figure 4. FIG. 6 is a schematic diagram of the arrangement of a battery cell according to another embodiment of the present application. FIG. 7 is an exploded view of a battery according to one embodiment of the present application. Figure 8 is a schematic diagram of the arrangement of the battery cells shown in Figure 7. FIG. 9 is a schematic diagram of a battery cell according to one embodiment of the present application. FIG. 10 is a schematic diagram of a battery according to one embodiment of the present application. FIG. 11 is a schematic diagram of the heat-conducting member illustrated in FIG. 10. FIG. 12 is a schematic diagram of the heat-conducting member and a plurality of battery cells shown in FIG. 10. Figure 13 is a schematic diagram of another work of the battery shown in Figure 10. FIG. 14 is a schematic diagram of a part of the structure of a battery according to one embodiment of the present application. Figure 15 is a schematic diagram of another work of the battery shown in Figure 14. Figure 16 is a schematic diagram of the arrangement of the battery cells shown in Figure 14. FIG. 17 is a schematic diagram of a part of the structure of a battery according to one embodiment of the present application. Fig. 18 is a schematic diagram of another work of the battery shown in Fig. 17. Fig. 19 is another schematic diagram of the battery shown in Fig. 17. FIG. 20 is a schematic diagram of a part of the structure of a battery according to one embodiment of the present application. FIG. 21 is a schematic diagram of the thermal management member shown in FIG. 20. FIG. 22 is a cross-sectional view of the thermal management member shown in FIG. 21. Figure 23 is an enlarged view of part A, indicated by a circle in Figure 22. FIG. 24 is a cross-sectional view of a heat-conducting member having a separating member installed inside according to one embodiment of the present application. Figure 25 is an enlarged view of part B, indicated by a circle in Figure 22. Figure 26 is an enlarged view of part C, indicated by a circle in Figure 22. FIG. 27 is a cross-sectional view of a heat-conducting member according to one embodiment of the present application. Figure 28 is an enlarged view of part D, indicated by a circle in Figure 27. Figure 29 is an enlarged view of part E, indicated by a circle in Figure 27. FIG. 30 is a schematic diagram of a part of the structure of a battery according to one embodiment of the present application. Fig. 31 is a local cross-sectional view of the battery shown in Fig. 30. Figure 32 is an enlarged view of part F, indicated by a circle in Figure 31. FIG. 33 is a schematic diagram of various structures of a separator according to some embodiments of the present application. FIG. 34 is an exploded view of a battery according to one embodiment of the present application. FIG. 35 is a schematic diagram of a battery according to one embodiment of the present application. FIG. 36 is a schematic diagram showing the connection between the battery cell and the thermal management member illustrated in FIG. 35. FIG. 37 is a cross-sectional view along the AA direction in FIG. 36. Fig. 38 is an enlarged view of part G, indicated by a circle in Fig. 37. FIG. 39 is a schematic diagram of a battery according to one embodiment of the present application. FIG. 40 is an exploded view of a battery according to one embodiment of the present application. FIG. 41 is an exploded view of a battery according to one embodiment of the present application. FIG. 42 is a schematic diagram of a battery according to one embodiment of the present application. Fig. 43 is a schematic diagram of another work of the battery shown in Fig. 42. Fig. 44 is another schematic diagram of the battery shown in Fig. 42. FIG. 45 is a cross-sectional view along the BB direction in FIG. 44. FIG. 46 is a schematic diagram of a battery according to one embodiment of the present application. FIG. 47 is a schematic diagram of the heat-conducting member shown in FIG. 46. FIG. 48 is a cross-sectional view of the main body plate shown in FIG. 47. FIG. 49 is another cross-sectional view of the main body plate shown in FIG. 47. FIG. 50 is a cross-sectional view of a main body plate according to one embodiment of the present application. FIG. 51 is a cross-sectional view of a main body plate according to one embodiment of the present application. FIG. 52 is a schematic diagram of a heat-conducting member according to one embodiment of the present application. FIG. 53 is a cross-sectional view of a heat-conducting member according to one embodiment of the present application. FIG. 54 is another cross-sectional view of the heat-conducting member in FIG. 53. FIG. 55 is a cross-sectional view of a separating member according to one embodiment of the present application. FIG. 56 is a cross-sectional view of a heat-conducting member according to one embodiment of the present application. FIG. 57 is a cross-sectional view of a separating member according to one embodiment of the present application. FIG. 58 is a cross-sectional view of a heat-conducting member according to one embodiment of the present application. FIG. 59 is a schematic diagram of a separating member according to one embodiment of the present application. FIG. 60 is a cross-sectional view of a heat-conducting member according to one embodiment of the present application. FIG. 61 is a cross-sectional view of a battery according to one embodiment of the present application. FIG. 62 is a cross-sectional view of a battery according to one embodiment of the present application. FIG. 63 is a cross-sectional view of a battery according to one embodiment of the present application. FIG. 64 is a cross-sectional view of a battery according to one embodiment of the present application. FIG. 65 is a schematic diagram of a heat-conducting member according to one embodiment of the present application. FIG. 66 is a cross-sectional view of a heat-conducting member according to one embodiment of the present application. FIG. 67 is a cross-sectional view of a heat-conducting member according to one embodiment of the present application. FIG. 68 is a cross-sectional view of a heat-conducting member according to one embodiment of the present application. FIG. 69 is a cross-sectional view of a heat-conducting member according to one embodiment of the present application. FIG. 70 is a cross-sectional view of a heat-conducting member according to one embodiment of the present application. FIG. 71 is a schematic diagram of a compressible chamber according to one embodiment of the present application. FIG. 72 is a local schematic diagram of a heat-conducting member according to one embodiment of the present application. FIG. 73 is a schematic diagram of another heat-conducting member shown in FIG. 72. FIG. 74 is a schematic diagram of a heat-conducting member according to one embodiment of the present application. FIG. 75 is a schematic diagram of a heat-conducting member according to one embodiment of the present application. FIG. 76 is a schematic diagram of a heat-conducting member according to one embodiment of the present application. FIG. 77 is a schematic diagram of a heat-conducting member according to one embodiment of the present application. FIG. 78 is a schematic diagram of a heat-conducting member according to one embodiment of the present application. FIG. 79 is an exploded view of a heat-conducting member according to one embodiment of the present application. FIG. 80 is a schematic diagram of the current collector element shown in FIG. 79. FIG. 81 is a schematic diagram of a battery according to one embodiment of the present application. FIG. 82 is a schematic diagram of a heat-conducting member according to one embodiment of the present application. FIG. 83 is a schematic diagram of a heat-conducting member according to one embodiment of the present application. Figure 84 is an enlarged view of part H, indicated by a circle in Figure 83. FIG. 85 is a schematic diagram of a battery according to one embodiment of the present application. FIG. 86 is a schematic diagram of a heat-conducting member according to one embodiment of the present application. FIG. 87 is a schematic diagram of another heat-conducting member shown in FIG. 86. FIG. 88 is a schematic diagram of a heat-conducting member according to one embodiment of the present application. Fig. 89 is an enlarged view of part I, indicated by a circle in Fig. 87. Fig. 90 is an enlarged view of part J, indicated by a circle in Fig. 88. Fig. 91 is a schematic diagram of another heat-conducting member in Fig. 90. FIG. 92 is a schematic diagram of a heat-conducting member according to one embodiment of the present application. FIG. 93 is a schematic diagram of a heat-conducting member according to one embodiment of the present application. Fig. 94 is an enlarged view of part K, indicated by a circle in Fig. 93. FIG. 95 is a schematic diagram of a heat-conducting member according to one embodiment of the present application. Fig. 96 is an enlarged view of part L, indicated by a circle in Fig. 95. FIG. 97 is a local schematic diagram of a heat-conducting member according to one embodiment of the present application. FIG. 98 is a local schematic diagram of a heat-conducting member according to one embodiment of the present application. FIG. 99 is a schematic diagram of a heat-conducting member according to one embodiment of the present application. FIG. 100 is a schematic diagram of a battery according to one embodiment of the present application. Fig. 101 is an exploded view of the battery shown in Fig. 100. FIG. 102 is a schematic diagram of a battery according to one embodiment of the present application. FIG. 103 is a schematic diagram of a heat-conducting member according to one embodiment of the present application. FIG. 104 is a schematic diagram of a heat-conducting member according to one embodiment of the present application. FIG. 105 is a schematic diagram of a heat-conducting member according to one embodiment of the present application. FIG. 106 is a schematic diagram of a heat-conducting member according to one embodiment of the present application. FIG. 107 is a schematic diagram of a battery according to one embodiment of the present application. FIG. 108 is a schematic diagram of a battery according to one embodiment of the present application. FIG. 109 is a schematic diagram of a battery according to one embodiment of the present application. FIG. 110 is a schematic diagram of a battery cell according to one embodiment of the present application. FIG. 111 is a schematic diagram of a battery according to one embodiment of the present application. FIG. 112 is a schematic diagram of a battery according to one embodiment of the present application. FIG. 113 is a schematic diagram of the heat-conducting member illustrated in FIG. 112. FIG. 114 is a schematic diagram of a heat-conducting member according to one embodiment of the present application. Fig. 115 is a schematic diagram of another heat-conducting member in Fig. 114. FIG. 116 is a schematic diagram of the structure of a housing provided in some embodiments of the present application. FIG. 117 is a CC cross-sectional view of the housing shown in FIG. 116. FIG. 118 is a grain size diagram (schematic) of the housing shown in FIG. 117. FIG. 119 is a local enlarged view of point E of the housing shown in FIG. 117. FIG. 120 is a local enlarged view of the housing provided in some other embodiments of the present application. FIG. 121 is a schematic diagram of the structure of a housing provided in another embodiment of the present application (showing a single notch groove). FIG. 122 is a cross-sectional view of the housing shown in FIG. 121. FIG. 123 is a schematic diagram of the structure of a housing provided in another embodiment of the present application (showing a single notch). FIG. 124 is a cross-sectional view of the FF housing shown in FIG. 123. FIG. 125 is a schematic diagram of the structure of a housing provided in some other embodiment of the present application (showing a single notch groove). FIG. 126 is a cross-sectional view of the housing shown in FIG. 125. FIG. 127 is a schematic diagram of the structure of a housing provided in another embodiment of the present application (showing a two-stage notch groove). FIG. 128 is a cross-sectional view of the KK housing shown in FIG. 127. FIG. 129 is a schematic diagram of the structure of a housing provided in another embodiment of the present application (showing a two-stage notch). FIG. 130 is an MM cross-sectional view of the housing shown in FIG. 129. FIG. 131 is a schematic diagram of the structure of a housing provided in some other embodiment of the present application (showing a two-stage notch groove). FIG. 132 is a cross-sectional view of the housing shown in FIG. 131. FIG. 133 is an axial view of a housing provided in some embodiments of the present application. FIG. 134 is a schematic diagram of the structure of the housing shown in FIG. 133 (showing the first stage notch groove and the first stage sink groove). FIG. 135 is a cross-sectional view of the housing shown in FIG. 134. FIG. 136 is a schematic diagram of the structure of a housing provided in another embodiment of the present application (showing a single notch groove and a single sink groove). FIG. 137 is a cross-sectional view of the PP housing shown in FIG. 136. FIG. 138 is a schematic diagram of the structure of a housing provided in some other embodiment of the present application (showing a single notch groove and a single sink groove). FIG. 139 is a QQ cross-sectional view of the housing member shown in FIG. 138. FIG. 140 is a schematic diagram of the structure of a housing provided in some embodiments of the present application (showing a first notch groove and a second sink groove). FIG. 141 is an RR cross-sectional view of the housing member shown in FIG. 140. FIG. 142 is a schematic diagram of the structure of a housing provided in another embodiment of the present application (showing a first notch groove and a second sink groove). FIG. 143 is a cross-sectional view of the SS housing shown in FIG. 142. FIG. 144 is a schematic diagram of the structure of a housing member provided in some other embodiments of the present application (showing a first notch groove and a second sink groove). FIG. 145 is a cross-sectional view of the TT housing shown in FIG. 144. FIG. 146 is a schematic diagram of the structure of a housing provided in another embodiment of the present application. FIG. 147 is a grain size diagram (schematic) of a housing provided in some other embodiments of the present application. FIG. 148 is a schematic diagram of the structure of an end cover provided in some embodiments of the present application. FIG. 149 is a schematic diagram of the structure of a case provided in some embodiments of the present application. FIG. 150 is a schematic diagram of the structure of a case provided in some other embodiments of the present application. FIG. 151 is a schematic diagram of the structure of a battery cell provided in some embodiments of the present application. FIG. 152 is a schematic diagram of the structure of an anode current collector according to one embodiment of the present application. FIG. 153 is a schematic diagram of the structure of an anode current collector according to another embodiment of the present application. FIG. 154 is a schematic diagram of the structure of a negative current collector according to one embodiment of the present application. FIG. 155 is a schematic diagram of the structure of a negative current collector according to another embodiment of the present application. FIG. 156 is a schematic diagram of the structure of an anode sheet according to one embodiment of the present application. FIG. 157 is a schematic diagram of the structure of an anode sheet according to another embodiment of the present application. FIG. 158 is a schematic diagram of the structure of a cathode sheet according to one embodiment of the present application. FIG. 159 is a schematic diagram of the structure of a cathode sheet according to another embodiment of the present application. FIG. 160 is a schematic diagram of the nail penetration test of the present application. Figure 161 is the temperature change curve after the nail penetration test of lithium-ion battery 1# and lithium-ion battery 4#. Figure 162 is the voltage change curve after the nail penetration test of lithium-ion battery 1# and lithium-ion battery 4#. Figure 163 is the X-ray diffraction (XRD) spectrum of undoped LiMnPO4 and the anode active material prepared in Example 2. Figure 164 is the X-ray energy dispersion spectrum (EDS) of the positive active material prepared in Example 2. FIG. 165 is a schematic diagram of an anode active material having a core-shell structure according to the present application. FIG. 166 is a schematic diagram of an anode active material having a core-shell structure according to one embodiment of the present application. FIG. 167 is a schematic diagram of a heat-conducting member and a separating member provided in some embodiments of the present application. FIG. 168 is a schematic diagram of the heat-conducting member and a plurality of battery cells shown in FIG. 167. Specific details for implementing the invention

[0087] The embodiments of the present application are described in further detail below by combining the drawings and examples. The following detailed description of the embodiments and drawings are intended to illustrate the principles of the present application, but they do not limit the scope of the application; that is, the present application is not limited to the described embodiments.

[0088] In the description of this application, unless otherwise noted, all technical and scientific terms used have the same meaning as commonly understood by a person skilled in the art to which this application pertains; the terms used are intended only to describe specific embodiments and are not intended to limit this application; any variations of the terms “include” and “equip” and any variations thereof in the specification, claims, and brief description of the drawings above are intended to cover non-exclusive inclusions; the meaning of “multiple” is two or more; and the directional or positional relationships indicated by terms such as “up,” “down,” “left,” “right,” “inside,” “outside,” etc. are intended only to describe and briefly explain this application and do not imply or suggest that the device or element indicated therein must be equipped with a specific direction and configured or operated in a specific direction, and should not be understood as a limitation to this application. In addition, terms such as “first,” “second,” and “third” are used merely for explanatory purposes and should not be understood as implying or suggesting relative importance. “Perpendicular” is not perpendicular in the strict sense, but is within the margin of error. “Parallel” is not parallel in the strict sense, but is within the margin of error.

[0089] The term “Examples” as used in this application means that the specific features, structures, or characteristics described in the Examples may be combined and included in at least one Example of this application. The appearance of such phrases at each location in the specification does not refer to the same Example, nor are they independent or alternative Examples excluded from each other. Those skilled in the art understand, expressly and implicitly, that the Examples described in this application may be combined with other Examples.

[0090] All directional terms used in the following description refer to directions depicted in the drawings and do not limit the specific structure of the present application. Further explanation in the description of the present application is that, unless otherwise specified or limited, the terms “mounting,” “interconnecting,” and “connecting” should be understood in a broad sense and may, for example, be a fixed connection, a detachable connection, or an integral connection; may be a direct connection, an indirect connection through an intermediate medium, or communication within two elements. A person skilled in the art can understand the specific meaning of the terms described above in the present application according to the specific circumstances.

[0091] In this application, the term “and / or” is merely an association describing the associated object, and three relationships may exist; for example, A and / or B may represent three cases: A existing alone, A and B existing simultaneously, or B existing alone. Unless otherwise specified, in this application, the term “or” is inclusive. For example, the phrase “A or B” indicates “A, B or both A and B”; more specifically, any one of the conditions where A is true (or exists) and B is false (or does not exist); or A is false (or does not exist) but B is true (or exists); or A and B are both true (or exist) satisfies “A or B”.

[0092] Unless otherwise specified, "inclusion" and "inclusion" as used in this application indicate an open form, but may also be a closed form. For example, "inclusion" and "inclusion" may indicate that other unlisted components may be included or included, or that only the listed components may be included or included.

[0093] The “range” disclosed in this application is limited in the form of lower and upper limits, and a given range is limited by selecting one lower limit and one upper limit, and the selected lower limit and upper limit define the boundaries of a specific range. A range limited in this manner may include or exclude the values ​​of endpoints and may also be arbitrarily combined, that is, 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 described; and any lower limit may be combined with another lower limit to form a range not explicitly described, and likewise any upper limit may be combined with any other upper limit to form a range not explicitly described. Additionally, although not explicitly described, each point or single value between the endpoints of a range is included in the corresponding range. Thus, each point or single value may be combined with any other point or single value as its own lower or upper limit, or combined with another lower or upper limit to form a range not explicitly described.

[0094] For example, if ranges of 60 to 120 and 80 to 110 are listed for a specific parameter, it is expected that they are understood as ranges of 60 to 110 and 80 to 120. Additionally, if minimum range values ​​1 and 2 are listed, and maximum range values ​​3, 4, and 5 are listed, the following ranges can all be expected to be 1 to 3, 1 to 4, 1 to 5, 2 to 3, 2 to 4, and 2 to 5. Unless otherwise stated in this application, numeric ranges "a to b" represent abbreviated expressions of any combination of real numbers between a and b, where a and b are both real numbers. For example, numeric ranges "0 to 5" mean that all real numbers between "0 to 5" have been listed in this application, and "0 to 5" is merely an abbreviated expression of such combinations of numbers. In addition, if one parameter is an integer ≥2, the parameter is disclosed as, for example, integers 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, etc. In this application, "about" a certain value indicates a range, and indicates a range of ±10% of the value.

[0095] Unless otherwise specified, all embodiments of the present application and selectable embodiments may be combined with one another to form a new technical solution. Unless otherwise specified, all technical features of the present application and selectable technical features may be combined with one another to form a new technical solution. Unless otherwise specified, all steps of the present application may be performed sequentially, may be performed randomly, and preferably are performed sequentially. For example, the method comprises steps (a) and (b), which indicates that the method may comprise steps (a) and (b) performed sequentially and steps (b) and (a) performed sequentially. For example, the above-mentioned method may further comprise step (c), which indicates that step (c) may be added to the method in any order, and for example, the method may comprise steps (a), (b), and (c), may comprise steps (a), (c), and (b), and may comprise steps (c), (a), and (b).

[0096] In this application, the terms "coating layer" and "coating" refer to a layer of material coated on an inner core material, such as lithium manganese phosphate, and it should be explained that said material layer may completely or partially cover the inner core, and that the term "coating layer" is used merely for convenience of explanation and is not intended to limit this application. Furthermore, each coating layer may be a complete coating or a partial coating. Likewise, the term "thickness of the coating layer" refers to the thickness of said material layer coated on the inner core in the radial direction of the inner core.

[0097] In this application, the battery cell may include a lithium-ion secondary battery, a lithium-ion primary battery, a lithium-sulfur battery, a sodium-lithium-ion battery, a sodium-ion battery, or a magnesium-ion battery, and the embodiments of this application are not limited thereto. The battery cell may be cylindrical, flat, rectangular, or have other shapes, and the embodiments of this application are not limited thereto. Battery cells are generally classified into three types based on the method of sealed packaging: columnar battery cells, rectangular battery cells, and soft-pack battery cells, and the embodiments of this application are not limited thereto.

[0098] The battery mentioned in the embodiments of the present application refers to a single physical module comprising one or more battery cells to provide higher voltage and capacity. For example, the battery mentioned in the present application may include a battery pack, etc. The battery generally includes a box body for sealing and packaging one or more battery cells. The box body can prevent liquids or other foreign substances from affecting the charging or discharging of the battery cells.

[0099] A box body (10) may include a first part (101) and a second part (102) (as shown in FIG. 2 and FIG. 3), the first part (101) and the second part (102) cover each other, and the first part (101) and the second part (102) jointly define a receiving space for receiving a battery cell (20). The second part (102) may be a hollow structure with one end open, and the first part (101) may be a plate-like structure, and the first part (101) may be covered on the opening side of the second part (102) to form a box body having a receiving space; the first part (101) and the second part (102) may both be hollow structures with one end open, and the opening side of the first part (101) may be covered on the opening side of the second part (102) to form a box body having a receiving space. Of course, the first part (101) and the second part (102) can be various shapes such as cylinders, rectangular prisms, etc.

[0100] To improve the sealing performance after connecting the first part (101) and the second part (102), a sealing member such as a sealing adhesive or a sealing ring may be installed between the first part (101) and the second part (102).

[0101] A battery cell comprises an electrode assembly and an electrolyte, and the electrode assembly consists of a positive electrode sheet, a negative electrode sheet, and a separator. The battery cell operates primarily through the movement of metal ions between the positive electrode sheet and the negative electrode sheet. The positive electrode sheet includes a positive current collector and a positive active material layer; the positive active material layer is applied to the surface of the positive current collector, and a current collector without the positive active material layer is protruded from the current collector with the positive active material layer applied, and the current collector without the positive active material layer is used as a positive tab. Taking a lithium-ion battery as an example, the material of the positive current collector may be aluminum, and the positive active material may be lithium cobalt oxide, lithium iron phosphate, ternary lithium, or lithium manganate. The negative electrode sheet includes a negative current collector and a negative active material layer; the negative active material layer is applied to the surface of the negative current collector, and a current collector without the negative active material layer is protruded from the current collector with the negative active material layer applied, and the current collector without the negative active material layer is used as a negative tab. The material of the cathode current collector may be copper, and the cathode active material may be carbon or silicon, etc. In order to ensure that a break does not occur due to melting caused by high current, the number of positive tabs is stacked together in multiple numbers, and the number of negative tabs is stacked together in multiple numbers.

[0102] There are no specific limitations on the separator described above, and any known porous structure separator having electrochemical stability and chemical stability may be adopted, and may be, for example, a single-layer or multi-layer thin film of glass fiber, nonwoven fabric, polyethylene, polypropylene, and polyvinylidene difluoride. The material of the separator may be polypropylene (PP) or polyethylene (PE), etc. Additionally, the electrode assembly may have a wound structure or a laminated structure, and the embodiments of the present application are not limited thereto.

[0103] The above-described electrolyte comprises an organic solvent and an electrolyte salt, wherein the electrolyte salt acts as an ion transport medium between the anode and the cathode, and the organic solvent is used as an ion transport medium. The electrolyte salt may be an electrolyte salt used as an electrolyte for a battery cell known in the art, such as one or more of LiPF6 (lithium hexafluorophosphate), LiBF4 (lithium tetrafluoroborate), LiClO4 (lithium perchlorate), LiAsF6 (lithium hexafluoroarsenate), LiFSI (lithium bisfluorosulfonylimide), LiTFSI (lithium bistrifluoromethanesulfonylimide), LiTFS (lithium trifluoromethanesulfonylimide), LiDFOB (lithium difluoro(oxalate)borate), LiBOB (lithium bis(oxalate)borate), LiPO2F2 (lithium difluorophosphate), LiDFOP (lithium difluoro(oxalate)phosphate), and LiTFOP (lithium tetrafluoro(oxalate)phosphate); The organic solvent may be an organic solvent used as an electrolyte for a battery cell known in the art, such as one or more of ethylene carbonate (EC), propylene carbonate (PC), ethylmethyl carbonate (EMC), diethyl carbonate (DEC), dimethyl carbonate (DMC), dipropyl carbonate (DPC), methylpropyl carbonate (MPC), ethylpropyl carbonate (EPC), butylene carbonate (BC), fluoroethylene carbonate (FEC), methyl formate (MF), methyl acetate (MA), ethyl acetate (EA), propyl acetate (PA), methyl propionate (MP), ethyl ethyl propionate (EP), propyl propionate (PP), methyl butyrate (MB), ethyl butyrate (EB), 1,4-butyrolactone (GBL), tetramethylene sulfone (SF), dimethyl sulfone (MSM), methyl ethyl sulfone (EMS), and diethyl sulfone (ESE), and preferably There are two or more types, and appropriate electrolyte salts and organic solvents can be selected according to actual needs.

[0104] Of course, battery cells may not contain electrolyte.

[0105] To meet various power requirements, the battery may comprise multiple battery cells, wherein the multiple battery cells may be connected in series, parallel, or a mixed connection, and a mixed connection refers to a combination of series and parallel connections. Optionally, the multiple battery cells may first form a battery module in a series, parallel, or mixed connection, and the multiple battery modules may also form a battery in a series, parallel, or mixed connection. That is, the multiple battery cells may directly form a battery, or a battery module may be formed first, and then the battery module or battery pack may again form a battery. The battery is additionally installed in an electrical device to provide electrical energy to the electrical device.

[0106] Advancements in battery technology require the simultaneous consideration of various design factors, such as energy density, cycle life, discharge capacity, charge-discharge ratio, and safety. In this context, when the internal space of a battery is constant, maximizing the utilization of that space is an effective means of increasing energy density. However, while increasing internal space utilization, other parameters such as thermal conductivity or thermal management must also be considered. Furthermore, increasing internal space utilization can compromise the structural strength of the battery. For instance, beams are typically installed inside the battery housing to mount battery modules, and side plates and end plates are also installed on the modules within the battery. These aforementioned beams, side plates, and end plates secure the battery while also occupying internal space. However, if these beams, side plates, and end plates are not installed, the structural strength of the battery is insufficient, which affects battery performance.

[0107] During the battery charging and discharging process, a large amount of heat is generated. In particular, during rapid charging, the battery cells produce a significant amount of heat; as this heat continuously accumulates and stacks, it causes the battery temperature to rise rapidly. If the heat from the battery cells is not released in a timely manner, thermal runaway occurs, which can lead to safety accidents such as smoke, ignition, and explosion. At the same time, severe temperature non-uniformity over a long period significantly shortens the battery's service life. Furthermore, when the temperature is very low, the battery's discharge efficiency is very poor, and even low-temperature operation becomes difficult, affecting the normal use of the battery. Therefore, ensuring the thermal management requirements of the battery is of great importance.

[0108] In light of this, the embodiment of the present application provides a technical solution. In the embodiment of the present application, at least two battery cells are installed to be accommodated within a receiving chamber of a box body in a battery, and a heat-conducting member is connected to at least two battery cells and installed to be heat-conductively connected to the first wall of at least two battery cells, so that the heat-conducting member is used to conduct heat from at least two battery cells. In this way, there is no need to install additional structures such as beams in the center of the battery box body, and there is no need to install additional side plates inside the battery, thereby greatly improving the space utilization inside the battery and improving the energy density of the battery; at the same time, heat conduction within the battery can be ensured by using the aforementioned heat-conducting member. Accordingly, the technical solution according to the embodiment of the present application can improve the energy density of the battery while simultaneously ensuring heat conduction within the battery, thereby improving the performance of the battery.

[0109] The technical solution described in the embodiments of the present application is applicable to various devices using batteries, such as mobile phones, portable devices, laptop computers, battery vehicles, electric toys, power tools, electric vehicles, ships, and space equipment, for example, space equipment includes aircraft, rockets, space shuttles, and spacecraft.

[0110] It should be understood that the technical solution described in the embodiments of this application applies not only to the device described above but also to all devices using batteries; however, for the convenience of explanation, all of the following embodiments are described using electric vehicles as examples.

[0111] For example, as illustrated in FIG. 1, this is a schematic diagram of the structure of a vehicle (1000) according to one embodiment of the present application, and the vehicle (1000) may be a fuel vehicle, a natural gas vehicle, or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle, or a range-extended vehicle, etc. A motor (101), a controller (102), and a battery (100) may be installed inside the vehicle (1000), and the controller (102) is used to control the battery (100) to supply power to the motor (101). For example, the battery (100) may be installed in the bottom part, the head part, or the rear part of the vehicle (1000). The battery (100) can be used to supply power to the vehicle (1000), for example, the battery (100) can be used as the operating power of the vehicle (1000), used in the circuit system of the vehicle (1000), for example, used to meet the demand for operating power usage during starting, navigation, and driving of the vehicle (1000). In another embodiment of the present application, the battery (100) can not only be used as the operating power of the vehicle (1000), but also as the driving power of the vehicle (1000), thereby providing driving power to the vehicle (1000) by replacing or partially replacing fuel or natural gas.

[0112] To meet various power usage requirements, the battery (100) may include one or more battery cells (20). For example, as illustrated in FIGS. 2 and FIGS. 3, this is a schematic diagram of the structure of the battery (100) according to one embodiment of the present application, and the battery (100) may include a plurality of battery cells (20). The battery (100) may further include a box body (10), the interior of the box body (10) is a hollow structure, and a plurality of battery cells (20) are accommodated within the box body (10). For example, a plurality of battery cells (20) are combined in parallel, series, or mixed connections with each other and then placed within the box body (10).

[0113] Optionally, the battery (100) may further include other structures, which are not described here in detail. For example, the battery (100) may further include a bus member (not shown), which is used to implement electrical connections between multiple battery cells (20), such as parallel, series, or mixed connections. Specifically, the bus member may implement electrical connections between battery cells (20) by connecting the electrode terminals of the battery cells (20). Additionally, the bus member may be fixed to the electrode terminals of the battery cells (20) by welding. The electrical energy of the multiple battery cells (20) may additionally be drawn out by penetrating the box body through a conductive mechanism. Optionally, the conductive mechanism may be part of the bus member.

[0114] Depending on various power requirements, the number of battery cells (20) can be installed at any value, for example, there may be only one battery cell (20). Multiple battery cells (20) can be connected in series, parallel, or mixed connections to achieve greater capacity or power. Since the number of battery cells (20) included in each battery (100) may be greater, the battery cells (20) may be grouped and installed for convenient mounting, and each group of battery cells (20) may form a battery module. The number of battery cells (20) included in a battery module is not limited and can be installed as needed. The battery may include multiple battery modules, and these battery modules may be connected in series, parallel, or mixed connections.

[0115] As illustrated in FIG. 4, this is a schematic diagram of the structure of a battery cell (20) according to one embodiment of the present application, wherein the battery cell (20) comprises one or more electrode assemblies (22), a case (211), and a cover plate (212). The case (211) and the cover plate (212) form a housing or battery box (21) of the battery cell (20). The walls of the case (211) and the cover plate (212) are both referred to as walls of the battery cell (20), wherein, in the case of a rectangular battery cell (20), the walls of the case (211) include a bottom wall and four side walls. The case (211) is determined according to the shape after one or more electrode assemblies (22) are combined, for example, the case (211) may be a hollow rectangular prism, a cube, or a cylinder, and one side of the case (211) may have an opening so that one or more electrode assemblies (22) can be placed inside the case (211), and a cover plate (212) covers the opening of the case (211) to block the internal environment of the battery cell (20) from the external environment. For example, when the case (211) is a hollow rectangular prism or a cube, one plane of the case (211) is an open surface, that is, the plane does not have a wall so that the inside and outside of the case (211) can be connected. When the case (211) may be a hollow cylinder, the cross-section of the case (211) is an open surface, that is, the cross-section does not have a wall so that the inside and outside of the case (211) can be connected. The cover plate (212) covers the opening and is also connected to the case (211) to form a sealed cavity in which the electrode assembly (22) is placed. The case (211) is filled with an electrolyte, such as an electrolyte solution.

[0116] The battery cell (20) may include two electrode terminals (214), and the two electrode terminals (214) may be installed on a cover plate (212). The cover plate (212) is typically flat, and the two electrode terminals (214) are fixed to the flat surface of the cover plate (212), and the two electrode terminals (214) are a positive terminal (214a) and a negative terminal (214b), respectively. A connecting member (23) is installed correspondingly on each electrode terminal (214), and the connecting member may also be called a current collector, and 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).

[0117] As illustrated in FIG. 4, each electrode assembly (22) is provided with a first tab (221a) and a second tab (222a). The polarities of the first tab (221a) and the second tab (222a) are opposite. For example, when the first tab (221a) is a positive tab, the second tab (222a) is a negative tab. The first tab (221a) of one or more electrode assemblies (22) is connected to one electrode terminal through one connecting member (23), and the second tab (222a) of one or more electrode assemblies (22) is connected to another electrode terminal through another connecting member (23). For example, the positive terminal (214a) is connected to the positive tab through one connecting member (23), and the negative terminal (214b) is connected to the negative tab through another connecting member (23).

[0118] In the battery cell (20), the electrode assembly (22) can be installed as a single one or multiple ones depending on the actual usage requirements, and as shown in FIG. 4, four independent electrode assemblies (22) are installed in the battery cell (20).

[0119] A pressure release mechanism (213) may also be installed in the battery cell (20). The pressure release mechanism (213) is operated when the internal pressure or temperature of the battery cell (20) reaches a critical value and is used to release the internal pressure or temperature.

[0120] The pressure release mechanism (213) may be a variety of possible pressure release structures, and embodiments of the present application are not limited thereto. For example, the pressure release mechanism (213) may be a temperature-sensitive pressure release mechanism configured to melt when the internal temperature of the battery cell (20) in which the pressure release mechanism (213) is installed reaches a critical value; and / or, the pressure release mechanism (213) may be a pressure-sensitive pressure release mechanism configured to burst when the internal air pressure of the battery cell (20) in which the pressure release mechanism (213) is installed reaches a critical value.

[0121] FIG. 10 shows a schematic diagram of the structure of a battery (100) according to one embodiment of the present application.

[0122] As illustrated in FIG. 10, the battery (100) comprises a box body (10), at least two battery cells (20), and a heat-conducting member (3a); the box body (10) comprises a receiving chamber (10a); the above-mentioned at least two battery cells (20) are received within the receiving chamber (10a); each battery cell (20) comprises an electrode assembly (22) and an electrode terminal (214); the electrode assembly (22) is electrically connected to the electrode terminal (214) so ​​that the battery cell (20) is used to provide electrical energy; Each battery cell (20) includes a first wall (201) which is the wall with the largest area among the battery cells (20), and the first wall (201) can be understood as the "face" of the battery cell (20), and a heat-conducting member (3a) is connected to at least two battery cells (20), and the heat-conducting member (3a) is used to accommodate a heat exchange medium, and the heat-conducting member (3a) is installed opposite the first wall (201) of at least two battery cells (20), and the heat-conducting member (3a) is thermally connected to the first wall (201) of at least two battery cells (20) to control the temperature of at least two battery cells (20) using a heat exchange medium.

[0123] A hollow cavity (30a) is installed within the heat-conducting member (3a) to accommodate a heat exchange medium and to control the temperature of the battery cell (20). It can also be understood that the hollow cavity (30a) can ensure the strength of the heat-conducting member (3a) while reducing the weight of the heat-conducting member (3a), and can be applied, for example, when the thickness of the heat-conducting member (3a) is greater. Additionally, the hollow cavity (30a) can allow the heat-conducting member (3a) to have a larger compression space in a direction perpendicular to the first wall (201) (for example, the first direction (x)), thereby providing a larger expansion space to the battery cell (20).

[0124] The heat exchange medium may be a liquid or a gas, and temperature control means heating or cooling a plurality of battery cells (20). When cooling the battery cells (20), the hollow cavity (30a) may accommodate a cooling medium to control the temperature of the plurality of battery cells (20). In this case, the heat exchange medium may be referred to as a cooling medium or a cooling fluid, and more specifically, as a cooling liquid or a cooling gas. Additionally, the heat exchange medium may be used for heating, and the embodiments of the present application are not limited thereto. Optionally, the heat exchange medium may flow circulatingly to achieve a better temperature control effect. Optionally, the fluid may be water, a mixture of water and ethylene glycol, a heat conduction oil, a refrigerant, or air. Optionally, the cooling medium may have a higher specific heat capacity to remove more heat, and at the same time, the cooling medium may have a lower boiling point so that it can rapidly boil and vaporize to absorb heat when thermal runaway occurs in the battery cells (20).

[0125] Accordingly, the heat-conducting member (3a) is connected to at least two battery cells (20) and the above-described at least two battery cells (20) can be connected as a whole through the heat-conducting member (3a). In this case, there is no need to install additional side plates inside the battery (100) or additional structures such as beams, so the space utilization inside the battery (100) can be greatly improved and the energy density of the battery (100) can be improved.

[0126] Additionally, the first wall (201), which is the face of at least two battery cells (20), is thermally connected to the heat-conducting member (3a), thereby enabling heat exchange between the heat-conducting member (3a) and at least two battery cells (20), and the heat exchange area between the heat-conducting member (3a) and each battery cell (20) among the at least two battery cells (20) is larger, so that the heat of the battery cells (20) is effectively utilized by utilizing the heat-conducting member (3a) and the heat exchange efficiency between the heat-conducting member (3a) and the battery cells (20) is improved, thereby ensuring that the temperature of the battery cells (20) is maintained in a normal state, and thus the service life and safety performance of the battery cells (20) can be improved; In addition, when thermal runaway occurs in one of the battery cells (20), the heat generated in the thermal runaway battery cell (20) is removed by a heat-conducting member (3a) that exchanges heat with it, thereby lowering the temperature of the thermal runaway battery cell (20) and preventing the occurrence of thermal runaway problems in adjacent battery cells (20), thereby ensuring the safety performance of the battery cell (20).

[0127] For example, when the temperature of the battery cell (20) is too high, the heat-conducting member (3a) can cool the battery cell (20) to lower the temperature of the battery cell (20). When the temperature of the battery cell (20) is too low, the heat-conducting member (3a) can heat the battery cell (20) to raise the temperature of the battery cell (20).

[0128] For example, the battery cells (20) of the battery (100) are a plurality of, and the plurality of battery cells (20) are arranged along a second direction (y), that is, the second direction (y) is the arrangement direction of the plurality of battery cells (20) of a single row of battery cells (20) in the battery (100). That is, the battery cells (20) of a single row of the battery (100) are arranged along the second direction (y), and the battery (100) has at least one row of battery cells (20). The number of battery cells (20) in a single row of battery cells (20) may be 2 to 20, but the embodiments of the present application are not limited thereto; The heat-conducting member (3a) extends along the second direction (y), and the heat-conducting member (3a) is thermally connected to the first wall (201) of each battery cell (20) among a plurality of battery cells (20), and the first wall (201) of the battery cell (20) may face the heat-conducting member (3a), that is, the first wall (201) of the battery cell (20) may be parallel to the second direction (y).

[0129] Optionally, the first wall (201) may be in direct contact with the heat-conducting member (3a) to enable heat transfer between the battery cell (20) and the heat-conducting member (3a); or the first wall (201) may be indirectly contacted with the heat-conducting member (3a), for example, the first wall (201) may be in contact with the heat-conducting member (3a) through a heat-conducting member such as a heat-conducting adhesive, and likewise enable heat transfer between the battery cell (20) and the heat-conducting member (3a). Clearly, the heat-conducting connection between the heat-conducting member (3a) and the first wall (201) means that heat exchange between the first wall (201) and the heat-conducting member (3a) can ensure the thermal management capability of the heat-conducting member (3a) for the battery cell (20).

[0130] In some embodiments, as illustrated in FIGS. 4 to 6, each battery cell (20) further comprises a second wall (202) connected to a first wall (201), the first wall (201) and the second wall (202) are installed intersectingly, the first wall (201) and the second wall (202) are not parallel, and the first wall (201) and the second wall (202) also have a common line; Here, the electrode terminal (214) is installed on the second wall (202), and the electrode terminal (214) is installed on the wall intersecting the first wall (201) excluding the first wall (201) in the battery cell (20), so that it is convenient for the installation of the electrode terminal (214) and at the same time convenient for implementing the yielding of the electrode terminal (214) and the heat conducting member (3a), so that there is no need to install a yielding part that yields the electrode terminal (214) to the heat conducting member (3a), which is advantageous for simplifying the structure of the heat conducting member (3a).

[0131] For example, in the examples of FIGS. 4 and 5, each battery cell (20) is formed in a roughly rectangular structure, and the length of the battery cell (20) is greater than the width of the battery cell (20) and the height of the battery cell (20), and the first wall (201) is located on one side in the first direction (x) of the battery cell (20), and at least one side of both sides in the second direction (y) of the battery cell (20) is provided with a second wall (202), and at least one side of both sides in the third direction (z) of the battery cell (20) is provided with a second wall (202), and the electrode terminal (214) may be installed on the second wall (202) in the third direction (z) of the battery cell (20); of course, as shown in FIG. 6, the electrode terminal (214) may also be installed on the second wall (202) in the second direction (y) of the battery cell (20).

[0132] Optionally, in the example of FIG. 6, each battery cell (20) may be a blade battery, and the length of the battery cell (20) > the width of the battery cell (20) > the height of the battery cell (20), the length in the second direction (y) of the battery cell (20) > the width in the third direction (z) of the battery cell (20) > the height in the first direction (x) of the battery cell (20), the first wall (201) may be located at one end in the height direction of the battery cell (20), the electrode terminal (214) may be installed on the second wall (202), the electrode terminal (214) may be located at one end or both ends in the length direction of the battery cell (20), and / or, the electrode terminal (214) may be located at one end or both ends in the width direction of the battery cell (20).

[0133] Of course, in the present application, the installation location of the electrode terminal (214) is not limited thereto. As shown in FIGS. 7 and 8, the electrode terminal (214) may be installed on the first wall (201), which is also convenient for the placement of the electrode terminal (214); for example, the battery cell (20) is a one-stop battery cell. Accordingly, in the case of the battery (100) according to the embodiment of the present application, the installation location of the electrode terminal has excellent flexibility.

[0134] In some embodiments, as illustrated in FIG. 8, an electrode terminal (214) is installed on a first wall (201), and at least two battery cells (20) are installed in a first direction (x). In the first direction (x), each battery cell (20) has a first surface (203) installed opposite the first wall (201), and a yielding groove (203a) is installed on the first surface (203). The yielding 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), thereby making it convenient to implement a dense arrangement of multiple battery cells (20) in the first direction, thus saving occupied space.

[0135] In some embodiments, as shown in FIGS. 4 to 6, each electrode terminal (214) is installed on a second wall (202), and the battery cell (20) includes two first walls (201) installed opposite each other and two second walls (202) installed opposite each other, and the electrode terminals (214) are installed in at least two places, and the plurality of electrode terminals (214) include a positive electrode terminal (214a) and a negative electrode terminal (214b).

[0136] Here, at least two electrode terminals (214) are installed on the same second wall (202) so that adjacent electrode terminals (214) are provided with an appropriate spacing, which is advantageous for saving space occupied by the battery cell (20); or, at least one electrode terminal (214) is installed on each second wall (202) so that electrode terminals (214) located on different second walls (202) are provided with a sufficient spacing.

[0137] For example, in the examples of FIGS. 4 and 5, the battery cell (20) comprises two first walls (201) installed oppositely along a first direction (x) and two second walls (202) installed oppositely along a third direction (z), wherein the third direction (z) is not parallel to the first direction (x), for example, the third direction (z) is perpendicular to the first direction (x); and a plurality of electrode terminals (214) are all located on the same second wall (202) in the third direction (z) of the battery cell (20).

[0138] Of course, in the case of a rectangular battery cell (20), the battery cell (20) may include two second walls (202) installed opposite each other along a second direction (y), and the second direction (y) is not parallel to the first direction (x), for example, the second direction (y) is perpendicular to the first direction (x); and a plurality of electrode terminals (214) are all located on the same second wall (202) in the second direction (y) of the battery cell (20).

[0139] Regardless of whether the plurality of electrode terminals (214) are located on one side in the second direction (y) of the battery cell (20) or on one side in the third direction (z) of the battery cell (20), when there are multiple battery cells (20) and multiple battery cells (20) are arranged sequentially along the second direction (y), the second walls (202) of two adjacent battery cells (20) face each other in the second direction (y).

[0140] In the present application, it must be explained that the first wall (201) may be flat or curved, and the second wall (202) may be flat or curved.

[0141] In some embodiments, as shown in FIG. 9, the first wall (201) is formed in a cylindrical shape; and the battery cell (20) may be a roughly cylindrical battery cell.

[0142] In some embodiments, as shown in FIG. 9, a second wall (202) is installed at both axial ends of the first wall (201), and at least one second wall (202) has an electrode terminal (214) installed thereon. All electrode terminals (214) of the battery cell (20) are installed on one second wall (202), or at least one electrode terminal (214) of the battery cell (20) is installed on one second wall (202), and the remaining electrode terminals (214) of the battery cell (20) are installed on another second wall (202). This makes it convenient to implement a flexible arrangement of the electrode terminals (214).

[0143] In some embodiments, as shown in FIG. 9, an exposed electrode terminal (214) is installed on one second wall (202), and the electrode assembly (22) includes an anode sheet (221) and a cathode sheet (222), one of the anode sheet (221) and the cathode sheet (222) is electrically connected to the electrode terminal (214), and the other of the anode sheet (221) and the cathode sheet (222) is electrically connected to the first wall (201), which is convenient for implementing normal power supply of the battery cell (20).

[0144] Of course, the other one of the positive sheet (221) and the negative sheet (222) described above may also be electrically connected to another second wall (202), that is, the second wall (202) on which the exposed electrode terminal (214) is installed and the second wall (202) electrically connected to the other one of the positive sheet (221) and the negative sheet (222) described above are not the same wall, and are likewise convenient for implementing normal power supply of the battery cell (20).

[0145] In some embodiments, at least one battery cell (20) is a soft pack battery cell, and when the battery (100) includes one battery cell (20), the battery cell (20) is a soft pack battery cell; and when the battery (100) includes a plurality of battery cells (20), at least one of the plurality of battery cells (20) is a soft pack battery cell. This makes it convenient to enrich the types and structures of the battery (100) and the layout of the battery cells (20), and is advantageous for the battery (100) to meet actual differentiation requirements.

[0146] In some embodiments, as shown in FIGS. 4 and 5, each battery cell (20) further includes a pressure relief mechanism (213), and the pressure relief mechanism (213) and the electrode terminal (214) are installed on the same wall of the battery cell (20), for example, the pressure relief mechanism (213) and the electrode terminal (214) are both installed on a second wall (202).

[0147] Of course, in another embodiment of the present application, each battery cell (20) further includes a pressure release mechanism (213), and the pressure release mechanism (213) and the electrode terminal (214) are each installed on two walls of the battery cell (20).

[0148] Thus, the position of the pressure release mechanism (213) relative to the electrode terminal (214) has a certain degree of flexibility.

[0149] In some embodiments, the heat-conducting member (3a) and the first wall (201) are fixed and connected to each other, which is convenient for implementing the connection between the heat-conducting member (3a) and the battery cell (20) and also ensuring a reliable connection between the battery cell (20) and the heat-conducting member (3a); at the same time, when there are at least two battery cells (20) and the heat-conducting member (3a) and the first wall (201) of at least two battery cells (20) are connected to each other, the at least two battery cells (20) described above can be connected as a whole through the heat-conducting member (3a), and in this case, there is no need to install additional side plates inside the battery (100) and no need to install additional structures such as beams, so the space utilization inside the battery (100) can be greatly improved and the energy density of the battery (100) can be improved.

[0150] Of course, the heat-conducting member (3a) is not limited to the first wall (201) and may be fixed and connected to another wall of the battery cell (20).

[0151] In some embodiments, the heat-conducting member (3a) is bonded to the first wall (201) of at least two battery cells (20) through a first adhesive layer, thereby bonding the heat-conducting member (3a) to the first wall (201) of at least two battery cells (20) to ensure a reliable and stable connection between the heat-conducting member (3a) and at least two battery cells (20), ensuring that the entire battery (100) has a certain rigidity and strength, and at the same time, reducing consumables and the total weight, which is advantageous for implementing a lightweight design of the battery (100), and also having a simple structure, making the structure more compact and convenient for processing and assembly.

[0152] Optionally, the first adhesive layer may include a thermal conductive structural adhesive and, in addition to having excellent adhesive strength and peel strength, possess characteristics such as thermal conductivity, aging resistance, fatigue resistance, and corrosion resistance, thereby improving the connection strength and thermal management efficiency between the battery cell (20) and the thermal conductive member (3a), allowing for faster heat transfer between the battery cell (20) and the thermal conductive member (3a). Of course, the first adhesive layer may further include a double-sided adhesive, etc.

[0153] It should be understood that the heat-conducting member (3a) and the first wall (201) may be connected by other methods such as rivet connection, welding, etc., and that the present application is not limited thereto.

[0154] In some embodiments, the bottom portion of the heat-conducting member (3a) is bonded to the bottom wall of the receiving chamber (10a) through a second adhesive layer, thereby bonding the bottom portion of the heat-conducting member (3a) to the bottom wall of the receiving chamber (10a) to achieve a fixed connection between the heat-conducting member (3a) and the bottom wall of the receiving chamber (10a), and the structure is simple, making processing and assembly convenient; at this time, the heat-conducting member (3a) is bonded and fixed to the first wall (201) and the bottom wall of the receiving chamber (10a), respectively, ensuring reliable installation of the heat-conducting member (3a).

[0155] In some embodiments, the bottom portion of the battery cell (20) is bonded to the bottom wall of the receiving chamber (10a) through a third adhesive layer, thereby bonding the bottom portion of the battery cell (20) to the bottom wall of the receiving chamber (10a) to achieve a fixed connection between the battery cell (20) and the bottom wall of the receiving chamber (10a), and the structure is simple, making processing and assembly convenient; at this time, the heat conducting member (3a) is bonded and fixed to the first wall (201), and the battery cell (20) is bonded and fixed to the bottom wall of the receiving chamber (10a), and the heat conducting member (3a) is indirectly fixed and connected to the bottom wall of the receiving chamber (10a) through the battery cell (20).

[0156] In some embodiments, the bottom portion of the heat-conducting member (3a) is bonded to the bottom wall of the receiving chamber (10a) through a second adhesive layer, and the bottom portion of the battery cell (20) is bonded to the bottom wall of the receiving chamber (10a) through a third adhesive layer.

[0157] In some embodiments, at least a portion of the heat of the battery cell (20) can be transferred to the heat-conducting member (3a) through the first adhesive layer, and the thickness of the first adhesive layer is less than or equal to the thickness of the second adhesive layer, which is advantageous for reducing the heat transfer resistance between the battery cell (20) and the heat-conducting member (3a) and ensuring the heat transfer efficiency between the battery cell (20) and the heat-conducting member (3a), provided that the battery cell (20) and the heat-conducting member (3a) are reliably connected and the bottom wall of the receiving chamber (10a) is reliably connected.

[0158] 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 advantageous for reducing the heat transfer resistance between the battery cell (20) and the heat-conducting member (3a) and ensuring the heat transfer efficiency between the battery cell (20) and the heat-conducting member (3a), provided that the battery cell (20) is reliably connected to the bottom wall of the heat-conducting member (3a) and the receiving chamber (10a), respectively.

[0159] In some embodiments, the thickness of the first adhesive layer is less than or equal to the thickness of the second adhesive layer, and the thickness of the first adhesive layer is less than or equal to the thickness of the third adhesive layer. By reasonably arranging the thickness of the first adhesive layer, the thickness of the second adhesive layer, and the thickness of the third adhesive layer, it is convenient to ensure reasonable distribution and utilization of the adhesive, thereby enabling reliable installation of the battery cell (20) and the heat-conducting member (3a) within the receiving chamber (10a).

[0160] 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 a portion of the heat of the battery cell (20) can be transferred to the heat-conducting member (3a) through the first adhesive layer, which is advantageous for reducing the heat transfer resistance between the battery cell (20) and the heat-conducting member (3a) and ensuring the heat transfer efficiency between the battery cell (20) and the heat-conducting member (3a), provided that the battery cell (20) and the heat-conducting member (3a) are reliably connected and the bottom wall of the receiving chamber (10a) is reliably connected.

[0161] In some embodiments, the thermal conductivity of the first adhesive layer is greater than the thermal conductivity of the third adhesive layer, which is advantageous for reducing the heat transfer resistance between the battery cell (20) and the heat-conducting member (3a) and ensuring the heat transfer efficiency between the battery cell (20) and the heat-conducting member (3a), provided that the battery cell (20) is reliably connected to the bottom wall of the heat-conducting member (3a) and the receiving chamber (10a), respectively.

[0162] Of course, some of the heat from the battery cell (20) may be transferred to and released from the bottom wall of the receiving chamber (10a) through the third adhesive layer.

[0163] In some embodiments, the thermal conductivity of the first adhesive layer is greater than or equal to the thermal conductivity of the second adhesive layer, and the thermal conductivity of the first adhesive layer is greater than or equal to the thermal conductivity of the third adhesive layer, which is convenient for implementing reasonable distribution and utilization of the adhesive, thereby ensuring stable installation of the battery cell (20) and the heat-conducting member (3a), and at the same time ensuring rapid release of heat from the battery cell (20).

[0164] In some embodiments, the ratio between the thickness of the first adhesive layer and the thermal conductivity of the first adhesive layer is a first ratio, the ratio between the thickness of the second adhesive layer and the thermal conductivity of the second adhesive layer is a second ratio, and the ratio between the thickness of the third adhesive layer and the thermal conductivity of the third adhesive layer is a third ratio.

[0165] Here, the first ratio is less than or equal to the second ratio; and / or, the first ratio is less than or equal to the third ratio. Thus, under the premise of ensuring the heat exchange effect of the battery cell (20), it is convenient to effectively and reasonably utilize the adhesive and implement a reasonable distribution of the adhesive.

[0166] In some embodiments, the material of the first adhesive layer and the material of the second adhesive layer are different; or, the material of the first adhesive layer and the material of the third adhesive layer are different; or, the material of the first adhesive layer is different from the material of the second adhesive layer and the material of the third adhesive layer, respectively.

[0167] In some embodiments, the battery (100) comprises a plurality of battery modules (100a), and the battery modules (100a) comprise at least one row of battery packs (20A) and at least one heat-conducting member (3a), and the battery packs (20A) comprise a row of multiple battery cells (20) arranged along a second direction (y), and the first wall (201) of each battery cell (20) among the battery packs (20A) is fixed to and heat-conductively connected to the heat-conducting member (3a). The battery packs (20A) and the heat-conducting members (3a) may each be multiple, and the multiple battery packs (20A) and the multiple heat-conducting members (3a) are alternately installed along a first direction (x), and the first direction is perpendicular to the first wall (201).

[0168] Optionally, the battery module (100a) comprises N groups of battery packs (20A) and N-1 heat-conducting members (3a), the heat-conducting members (3a) are installed between two adjacent groups of battery packs (20A), and N is an integer greater than 1; for example, when N is 2, the plurality of battery modules (100a) are arranged along a first direction (x), and a gap is provided between adjacent battery modules (100a). Of course, the heat-conducting members (3a) may also be installed between the battery packs (20A) and the inner wall of the box body (10).

[0169] In some embodiments, a row of battery cells (20) arranged along the second direction (y) may be connected to the heat-conducting member (3a) on only one side in the first direction (x), or both sides in the first direction (x) may be connected to the heat-conducting member (3a), and the embodiments of the present application are not limited thereto.

[0170] In some embodiments, the heat-conducting member (3a) is used to exchange heat with the battery cell (20) to ensure that the battery cell (20) has an appropriate temperature, and the heat-conducting member (3a) may also be referred to as a heat-managing member (3b), and the heat-managing member (3b) is also used to exchange heat with the battery cell (20) to ensure that the battery cell (20) has an appropriate temperature.

[0171] In some embodiments, the heat-conducting member (3a) comprises a metallic material and / or a non-metallic material, so that the heat-conducting member (3a) is provided with a flexible material selection installation, which is convenient for the heat-conducting member (3a) to be provided with other excellent performance in addition to excellent thermal conductivity, thereby better meeting actual differentiation requirements.

[0172] In some embodiments, as illustrated in FIGS. 10 to 13, the heat-conducting member (3a) comprises a metal plate (31) and an insulating layer (32), and the insulating layer (32) is installed on the surface of the metal plate (31). Through this installation, the metal plate (31) can ensure the strength of the heat-conducting member (3a), and the insulating layer (32) can ensure electrical insulation in the battery (100) by avoiding electrical connection between the metal plate (31) and the battery cell (20) by making the surface of the heat-conducting member (3a) connected to the first wall (201) an insulating surface.

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

[0174] In some embodiments, the heat-conducting member (3a) is a non-metallic material plate; that is, the entire heat-conducting member (3a) is a non-metallic insulating material. Of course, in other embodiments, a part of the heat-conducting member (3a) is a non-metallic material.

[0175] In some embodiments, as illustrated in FIGS. 14, 15 and 30, the battery cells (20) are a plurality of, and the plurality of battery cells (20) are arranged along a second direction (y); the heat-conducting member (3a) includes a separator (33) that extends along the second direction (y) and is connected to a first wall (201) of each battery cell (20) among the plurality of battery cells (20), and the second direction (y) is parallel to the first wall (201).

[0176] Thus, the first wall (201) having the largest surface area among the plurality of battery cells (20) is connected to the separator (33), and the plurality of battery cells (20) are connected as a whole through the separator (33), so that there is no need to install additional side plates inside the battery (100) or additional structures such as beams, and thus the space utilization inside the battery (100) can be greatly improved and the energy density of the battery (100) can be improved.

[0177] As the battery is used, the blue film on the surface of the battery cells is prone to damage. If the blue film is damaged, insulation between adjacent battery cells and between the battery cells and the box body is lost, increasing the risk of battery short circuits. Furthermore, to regulate the temperature of the battery cells and to install water cooling plates or heating plates between adjacent cells, the surfaces of these plates lack insulation protection. Consequently, water vapor inside the battery easily liquefies on the surface of the plates, and if the blue film is damaged, the risk of battery short circuits increases even further.

[0178] Based on the above considerations, in order to mitigate the problem of a short circuit in the battery caused by damage to the blue film, the inventor, through in-depth research, installed the heat-conducting member (3a) to further include an insulating layer (32), and the insulating layer (32) is used to insulate and isolate the first wall (201) of the battery cell (20) and the separator (33).

[0179] The insulating layer (32) is installed on the surface of the separator (33) so that it is not easily damaged by the external expansion of the battery cell or self-heating. When an insulating structure is not installed on the surface of the battery cell or the surface film of the battery cell is damaged, and water vapor inside the battery cell liquefies on the surface of the separator (33), the insulating layer (32) installed on the surface of the separator (33) can act as an insulator between the battery cell (20) and the separator (33), which is advantageous for mitigating the problem of a short circuit in the battery (100) caused by damage to the film of the battery cell (20) or the liquefaction of water vapor on the surface of the separator (33), reduces the risk of a short circuit in the battery (100), and improves the electrical safety of the electrical device.

[0180] Here, the insulating layer (32) is connected to the surface of the separator (33) so that the insulating layer (32) can cover a portion or the entire surface of the separator (33).

[0181] In some embodiments, the separator (33) is used to exchange heat with the battery cell (20), and the separator (33) may also be referred to as a thermal management member. The thermal management member is structured to exchange heat with the battery cell (20), such as a heat-generating resistance wire, a heat-conducting member equipped with a heat exchange medium, and some material capable of causing a temperature change by undergoing a chemical reaction according to changes in the environment. Heat exchange with the battery cell (20) is achieved through a temperature change of the thermal management member itself. In this case, if the temperature of the thermal management member is lower than the temperature of the battery cell (20), the thermal management member cools the battery cell (20) to avoid thermal runaway caused by the excessive temperature of the battery cell (20); if the temperature of the thermal management member is higher than the temperature of the battery cell (20), the thermal management member heats the battery cell (20) to ensure that the battery (100) can operate normally.

[0182] The thermal management member may be a structure capable of accommodating a fluid medium, and heat between the battery cell (20) and the fluid medium is transferred through the thermal management member and the insulating layer (32) to enable heat exchange between the battery cell (20) and the fluid medium. The fluid medium may be a liquid (e.g., water) or a gas (e.g., air). In this case, if the temperature of the fluid medium accommodating the thermal management member is lower than the temperature of the battery cell (20), the thermal management member cools the battery cell (20) to avoid thermal runaway caused by excessive temperature of the battery cell (20); if the temperature of the fluid medium accommodating the thermal management member is higher than the temperature of the battery cell (20), the thermal management member heats the battery cell (20) to ensure that the battery (100) can operate normally.

[0183] Optionally, the separator (33) may be installed on one side of the battery cell (20) and positioned between the battery cell (20) and the box body (10), or may be installed between two adjacent battery cells (20).

[0184] In some embodiments, the insulating layer (32) may insulate and isolate only 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 may also insulate and isolate the separator (33) and the inner wall of the box body (10), thereby further reducing the risk of a short circuit of the battery (100) and further improving the safety of the battery (100).

[0185] For example, a plurality of battery cells (20) may be stacked along a first direction (x), and a separator (33) may be installed between two adjacent battery cells (20), and an insulating layer (32) may be installed on each of the opposing sides of the separator (33), so that the two adjacent battery cells (20) and each battery cell (20) and the separator (33) can be insulated and isolated through the insulating layer (32).

[0186] For example, a separator (33) may be installed between the two battery cells (20) located at the shortest end and the inner wall of the box body (10) along the stacking direction of multiple battery cells (20), and an insulating layer (32) connected to the separator (33) may insulate and isolate only the battery cells (20) and the separator (33); of course, the insulating layer (32) connected to the separator (33) may not only insulate and isolate the battery cells (20) and the separator (33), but also insulate and isolate the separator (33) and the inner wall of the box body (10), thereby further reducing the risk of a short circuit of the battery (100) and further improving the safety of the battery (100).

[0187] In some embodiments, the thermal conductivity λ of the insulating layer (32) is 0.1 W / (m·K) or higher, and the insulating layer (32) has better thermal conductivity, so that the insulating layer (32) can perform a heat transfer role, thereby providing good thermal conductivity 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 a thermal management member (3b), it is convenient to effectively ensure that the battery cell (20) has an appropriate temperature.

[0188] Thermal conductivity refers to the heat transferred through an area of ​​1 square meter for 1 hour under stable heat transfer conditions, with a thickness of 1 m and a temperature difference of 1 degree (K, °C) between the two surfaces, and the unit is watt / meter·degree (W / (m·K), where K can be replaced with °C.

[0189] In some embodiments, the density of the insulating layer (32) is G≤1.5g / cm³ 3 am.

[0190] An insulating layer (32) is installed on the surface of the separator (33), thereby increasing the weight of the battery (100). The lower the density of the insulating layer (32), the smaller the mass of the insulating layer (32), and the higher the density of the insulating layer (32), the larger the mass of the insulating layer (32). Density of the insulating layer (32) G ≤ 1.5 g / cm³ 3 This reduces the weight of the insulating layer (32), thereby reducing the weight of the battery (100) and reducing the effect of the installation of the insulating layer (32) on the weight of the battery (100), which is advantageous for making the battery (100) lighter.

[0191] In some embodiments, the compressive strength P of the insulating layer (32) satisfies 0.01 MPa ≤ P ≤ 200 MPa, which allows the insulating layer (32) to have a certain elasticity, and when the battery cell (20) is deformed, the insulating layer (32) can reduce the impact on the entire battery (100) through its own deformation, or the insulating layer (32) having elasticity can act as a buffer through its own deformation when the battery (100) is subjected to impact, thereby providing a certain protective role to the battery cell (20) and improving the safety of the battery (100).

[0192] Compressive strength refers to the maximum compressive stress withstood until a sample ruptures or yields during a compression test.

[0193] The material of the insulating layer (32) can be selected from various options, for example, in some embodiments, the material of the insulating layer (32) includes at least one of polyethylene terephthalate, polyimide, and polycarbonate.

[0194] The material of the insulating layer (32) may include only one of polyethylene terephthalate, polyimide, and polycarbonate. In some other embodiments, the material of the insulating layer (32) may include two or three types of polyethylene terephthalate, polyimide, and polycarbonate. For example, the insulating layer (32) includes a first insulating part and a second insulating part installed in a stacked manner, wherein 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 yet another embodiment, the insulating layer (32) includes a first insulating part, a second insulating part, and a third insulating part installed in a stacked manner, wherein 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.

[0195] Polyethylene terephthalate, polyimide, and polycarbonate have advantages such as excellent impact resistance, excellent heat resistance, and anti-aging performance. Accordingly, 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 excellent impact resistance, excellent heat resistance, and anti-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 to 0.5 W / m·K, and the thermal conductivity of polycarbonate is generally 0.16 to 0.25 W / m·K. Therefore, all three materials have better thermal conductivity, so the insulating layer (32) is formed using at least one of the three materials, and the insulating layer (32) has good thermal conductivity, thereby improving the heat exchange performance and heat exchange efficiency between the battery cell (20) and the separator (33).

[0196] The method of connecting the insulating layer (32) to the separator (33) can vary, for example, in some embodiments, the insulating layer (32) is a coating layer applied to the surface of the separator (33). That is, the insulating layer (32) connects the separator (33) by a coating method. In this case, the insulating layer (32) may be connected to the battery cell (20) or may not be connected to the battery cell (20). The insulating layer (32) is a coating layer applied to the surface of the separator (33), and the insulating layer (32) and the separator (33) are bonded more closely, thereby improving the connection stability between the insulating layer (32) and the separator (33) and reducing the risk of the insulating layer (32) detaching from the separator (33).

[0197] For example, in some other embodiments, the insulating layer (32) and the separator (33) are connected through an adhesive layer. The adhesive layer may be an adhesive layer installed 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 positioned between the separator (33) and the insulating layer (32). In this case, the insulating layer (32) may be connected to the battery cell (20) through another adhesive layer, or it may not be connected to the battery cell (20). When the insulating layer (32) and the separator (33) are connected through an adhesive layer, the connection method is simple and convenient.

[0198] For 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 injecting a liquid composite into a component by mechanical or manual means and curing it into a high-performance thermosetting polymer insulating material at room temperature or under heating conditions. By installing the insulating layer (32) between the separator (33) and the battery cell (20) through the potting method, the integrity of the entire structure formed by the battery cell (20), the insulating layer (32), and the separator (33) can be strengthened, and the ability to resist external shocks and vibrations can be improved.

[0199] In some embodiments, as shown in FIG. 14, the dimension T1 in the first direction (x) of the separator plate (33) is smaller than 0.5 mm, and the first direction (x) is perpendicular to the first wall (201). In this way, the dimension in the first direction (x) of the separator plate (33) is not too large and does not occupy an excessive amount of space inside the battery (100), thereby further improving the utilization of space inside the battery (100) and improving the energy density of the battery (100).

[0200] In some embodiments, the dimension T1 in the first direction (x) of the separator plate (33) is 0.05 mm or larger. In this way, the dimension in the first direction (x) of the separator plate (33) is too small, that is, the thickness of the separator plate (33) is smaller and the rigidity of the separator plate (33) is smaller, so that the strength requirements of the battery (100) cannot be met.

[0201] In some embodiments, as shown in FIG. 14(c), an insulating layer (32) is installed on the surface of the separator (33) to avoid electrical connection between the separator (33) and the battery cell (20), thereby improving the safety of the battery (100). Optionally, the insulating layer (32) may be an insulating film adhered to the surface of the separator (33) or an insulating paint applied to the surface of the separator (33).

[0202] In some embodiments, the dimension T2 in the first direction (x) of the insulating layer (32) satisfies 0.01mm ≤ T2 ≤ 0.3mm.

[0203] When the dimension T2 in the first direction (x) of the insulating layer (32) is too small, the insulating layer (32) cannot effectively avoid electrical connection between the battery cell (20) and the separator (33), resulting in insulation failure of the battery (100) and a safety risk. When the dimension T2 in the first direction (x) of the insulating layer (32) is too large, it occupies an excessive amount of space inside the battery (100), which is disadvantageous for improving the energy density of the battery (100). Therefore, the value of T2 is set to 0.01 mm to 0.3 mm, and in this way, not only can the energy density of the battery (100) be improved, but the safety of the battery (100) can also be guaranteed.

[0204] In an embodiment of the present application, the voltage E of the battery (100) and the dimension T2 in the first direction (x) of the insulating layer (32) are 0.01×10 -3 mm / V≤T2 / E≤3×10 -3 Meets mm / V.

[0205] The insulating effect of the insulating layer (32) is related not only to the thickness of the insulating layer (32) but also to the thickness of the insulating layer (32) corresponding to the unit voltage. When T2 / E is too small, that is, when the dimension T2 in the first direction (x) of the insulating layer (32) of the unit voltage is too small, the insulating layer (32) cannot effectively avoid electrical connection between the battery cell (20) and the separator (33), resulting in insulation failure of the battery (100) and a safety risk; when T2 / E is too large, that is, when the dimension T2 in the first direction (x) of the insulating layer (32) of the unit voltage is too large, it occupies an excessive amount of space inside the battery (100), which is disadvantageous for improving the energy density of the battery (100), so the value of T2 / E is 0.01 × 10 -3 ~3×10 -3 It is installed at mm / V, and in this way, not only can the energy density of the battery (100) be improved, but the safety of the battery (100) can also be guaranteed.

[0206] In some embodiments, the surface area S1 of the separator plate (33) connected to the first wall (201) of a plurality of battery cells (20) and the total area S2 of the first wall (201) of a plurality of battery cells (20) connected to the same side of the separator plate (33) satisfy 0.25 ≤ S1 / S2 ≤ 4, where S1 = H1 * L1 and S2 = H2 * L2. As shown in FIG. 15, H1 is the dimension in the third direction (z) of the separator plate (33), L1 is the dimension in the second direction (y) of the separator plate (33), H2 is the dimension in the third direction (z) of a single battery cell (20), and L2 is the sum of the dimensions in the second direction (y) of a plurality of battery cells (20).

[0207] When the value of S1 / S2 is too small, that is, when the surface area S1 of the separator plate (33) connected to the first wall (201) of a plurality of battery cells (20) is much smaller than the total area S2 of the first wall (201) of a plurality of battery cells (20) connected to the same side of the separator plate (33), the contact area between the first wall (201) and the separator plate (33) is too small to satisfy the strength requirements of the battery (100); When the value of S1 / S2 is too large, that is, when the surface area S1 of the separator plate (33) connected to the first wall (201) of the plurality of battery cells (20) is much larger than the total area S2 of the first wall (201) of the plurality of battery cells (20) connected to the same side of the separator plate (33), the separator plate (33) occupies an excessive amount of space inside the battery (100) compared to the battery cell (20), which is disadvantageous for improving the energy density of the battery (100), so the value of S1 / S2 is set to 0.25 to 4, and thus not only can the energy density of the battery (100) be improved, but the strength of the battery (100) can also be improved.

[0208] In some embodiments, as shown in FIG. 15, in the third direction (z), the dimension H1 of the separator (33) and the dimension H2 of the first wall (201) of the battery cell (20) satisfy 0.2 ≤ H1 / H2 ≤ 2, and the third direction (z) is perpendicular to the first direction (x) and the second direction (y).

[0209] When H1 / H2 is too small, that is, in the third direction (z), when the dimension H1 of the separator plate (33) is much smaller than the dimension H2 of the first wall (201) of the battery cell (20), the contact area between the first wall (201) and the separator plate (33) is too small and cannot satisfy the strength requirements of the battery (100); when H1 / H2 is too large, that is, in the third direction (z), when the dimension H1 of the separator plate (33) is much larger than the dimension H2 of the first wall (201) of the battery cell (20), the separator plate (33) occupies an excessive amount of space inside the battery (100) compared to the battery cell (20), which is disadvantageous for improving the energy density of the battery (100), so the value of H1 / H2 is set to 0.2 to 2, and thus not only can the energy density of the battery (100) be improved, but the strength of the battery (100) can also be improved.

[0210] In some embodiments, as shown in FIG. 15, in the second direction (y), the dimension L1 of the separator (33) and the dimension L2 of the plurality of battery cells (20) satisfy 0.5≤L1 / L2≤2.

[0211] When L1 / L2 is too small, that is, in the second direction (y), when the dimension L1 of the separator plate (33) is much smaller than the dimension L2 of the first wall (201) of the battery cell (20), the contact area between the first wall (201) and the separator plate (33) is too small and cannot satisfy the strength requirements of the battery (100); when L1 / L2 is too large, that is, in the second direction (y), when the dimension L1 of the separator plate (33) is much larger than the dimension L2 of the first wall (201) of the battery cell (20), the separator plate (33) occupies an excessive amount of space inside the battery (100) compared to the battery cell (20), which is disadvantageous for improving the energy density of the battery (100), so the value of L1 / L2 is set to 0.5 to 2, and thus not only can the energy density of the battery (100) be improved, but the strength of the battery (100) can also be improved.

[0212] Optionally, a fixing structure (103) is installed at the end of the separator plate (33) in the second direction (y), and the fixing structure (103) is connected to a fixing member (104) at the end of the separator plate (33) in the second direction (y) to fix the separator plate (33).

[0213] Using the battery cell (20) and separator (33) shown in FIG. 14, a separator vibration shock resistance test was performed in accordance with the GB38031-2020 "Safety requirements for power batteries for electric vehicles" standard, and the test results are shown in Table 1. In Table 1, T1 is the dimension of the separator in the first direction (x), H1 is the dimension of the separator in the third direction (z), L1 is the dimension of the separator in the second direction (y), H2 is the dimension of a single battery cell in the third direction (z), L2 is the sum of the dimensions of multiple battery cells in the second direction (y), S1=H1*L1, and S2=H2*L2.

[0214] T1(mm) H2(mm) L2(mm) L1(mm) H1(mm) S1 / S2 L1 / L2 H1 / H2 Vibration and shock test results 0.1 30 400 800 60 4 2 2 Uncracked, unignited, and unexploded 0.5 30 400 200 15 0.25 0.5 1 Uncracked, unignited, and unexploded 0.4 80 1148 1148 40 0.5 1 0.4 Uncracked, unignited, and unexploded 0.4 80 1148 574 80 0.5 0.5 0.8 Uncracked, unignited, and unexploded 0.2 112 1164 1224 100 0.94 1.05 0.19 Uncracked, unignited, and unexploded 0.4 127 348 278.4 63.5 0.4 0.8 0.5 Uncracked, unignited, and unexploded 0.4 127 348 174 63.5 0.25 0.5 0.8 Uncracked, unignited, and unexploded 0.3 205 522 582 193 1.05 1.11 0.27 Uncracked, unignited, and unexploded 0.5 205 522 417.6 102.5 0.4 0.80 0.625 Uncracked, unignited, and unexploded 0.1 112 776 836 100 0.96 1.08 0.09 Uncracked, unignited, and unexploded 0.5 112 1164 1224 100 0.94 1.05 0.48 Uncracked, unignited, and unexploded

[0215] Using the battery cell (20) and separator (33) illustrated in FIGS. 14 and 15, and referring to IEC 60664-1, 1000VDC was applied for an insulation test with an insulation resistance value ≥ 500MΩ; 2700VDC was applied for a withstand voltage test with a leakage current ≤ 1mA and sustained for 60 seconds, and the insulation withstand voltage capability of the separator was tested, and the test results are as shown in Table 2. In Table 2, T2 is the dimension of the insulation layer in the first direction (x), and E is the battery voltage.

[0216] T2(mm) E(V) T2 / E(10 -3 mm / V) Insulation breakdown voltage test results 0.01 1000 0.01 Meets insulation withstand voltage requirements 0.3 1000 0.3 Meets insulation withstand voltage requirements 0.3 100 3 Meets insulation withstand voltage requirements 0.15 400 0.38 Meets insulation withstand voltage requirements 0.15 800 0.19 Meets insulation withstand voltage requirements 0.3 300 1 Meets insulation withstand voltage requirements 0.3 200 1.5 Meets insulation withstand voltage requirements 0.2 800 0.25 Meets insulation withstand voltage requirements 0.2 350 0.57 Meets insulation withstand voltage requirements

[0217] In some embodiments, as shown in FIGS. 30 and 31, the dimension T1 in the first direction (x) perpendicular to the first wall (201) of the separator plate (33) is greater than 0.5 mm, ensuring that the separator plate (33) has excellent reliability of use.

[0218] For example, as illustrated in FIG. 30, the battery (100) comprises a plurality of battery cells (20) arranged along a second direction (Y) and a separator (33), wherein the separator (33) extends along the second direction (Y) and is connected to a first wall (201) of each battery cell (20) among the plurality of battery cells (20).

[0219] In some embodiments, the dimension T1 in the first direction (x) of the separator plate is 100 mm or less.

[0220] When the dimension T1 in the first direction (x) of the separator is too large, it occupies an excessive space inside the battery (100), which is disadvantageous for improving the energy density of the battery (100). Therefore, the value of T1 can be set to 100 mm or less so that the energy density of the battery (100) can be effectively improved.

[0221] In some embodiments, as shown in FIG. 31, the dimension T1 in the first direction (x) of the separator plate (33) and the dimension T3 in the first direction (x) of the battery cell (20) satisfy 0.04 ≤ T1 / T3 ≤ 2.

[0222] If T1 / T3 is too small, that is, when the dimension T1 in the first direction (x) of the separator plate (33) is much smaller than the dimension T3 in the first direction (x) of the battery cell (20), the separator plate (33) has a weak ability to absorb deformation, so it cannot match the amount of expansion deformation of the battery cell (20), which can degrade the performance of the battery cell (20); and if T1 / T3 is too large, that is, when the dimension T1 in the first direction (x) of the separator plate (33) is much larger than the dimension T3 in the first direction (x) of the battery cell (20), the separator plate (33) has a strong ability to absorb deformation, so it far exceeds the expansion deformation space required for the battery cell (20), and the separator plate (33) occupies an excessive space inside the battery (100) compared to the battery cell (20), which is disadvantageous for improving the energy density of the battery (100), so the value of T1 / T3 is set to 0.04 to 2, and thus the battery (100) Not only can it improve energy density, but it can also absorb the amount of expansion deformation of the battery cell (20).

[0223] In some embodiments, an insulating layer (32) is installed on the outer surface of the separator plate (33), and the dimension T2 along the first direction (x) of the insulating layer (32) is 0.01 mm to 0.3 mm.

[0224] By installing an insulating layer (32) on the outer surface of the separator (33), electrical connection between the battery cell (20) and the separator (33) is avoided, thereby improving the safety of the battery (100). When the dimension T2 in the first direction (x) of the insulating layer (32) is too small, the insulating layer (32) cannot effectively avoid electrical connection between the battery cell (20) and the separator (33), and thus insulation failure occurs in the battery (100). When the dimension T2 in the first direction (x) of the insulating layer (32) is too large, it occupies an excessive amount of space inside the battery (100), which is disadvantageous for improving the energy density of the battery (100). Therefore, the value of T2 is installed to be 0.01 mm to 0.3 mm. In this way, not only can the energy density of the battery (100) be improved, but effective insulation between the battery cell (20) and the separator (33) can also be ensured.

[0225] Optionally, a current collector (106) is installed at the end of the separator plate (33) in the second direction (y), and a conduit (107) is installed inside the battery (100). The conduit (107) is used to transport fluid, and the current collector (106) is used to collect fluid. For example, the connecting pipe assembly (42) described below may include the conduit (107).

[0226] Using the battery cell (20) and separator (33) illustrated in FIGS. 30 to 34, a 1C / 1C charge / discharge cycle was performed at 60°C until the capacity was reduced to 80% SOC, and the results of the accelerated cycle endurance test were performed, and the test results are shown in Table 3. In Table 3, T1 is the dimension of the separator in the first direction (x), and T3 is the dimension of the battery cell in the first direction (x).

[0227] T3(mm) T1(mm) T1 / T3 Cycle endurance acceleration test results 125 5.1 0.041 No structural damage, no diving occurred 26.5 6 0.226 No structural damage, no diving occurred 12.5 25 2.000 No structural damage, no diving occurred 47.4 5.1 0.108 No structural damage, no diving occurred 44 20 0.455 No structural damage, no diving occurred 44 60 1.364 No structural damage, no diving occurred 70.7 70 0.990 No structural damage, no diving occurred 10 15 1.500 No structural damage, no diving occurred 44 30 0.682 No structural damage, no diving occurred 10.72 6 0.085 No structural damage, no diving occurred 10 6 0.6 No structural damage, no diving occurred

[0228] In some embodiments, as shown in FIGS. 10 to 13, a heat-conducting member (3a) is fixed to a first wall (201) of one or more battery cells (20), and in order to ensure the performance of the battery (100), the heat-conducting member (3a) must also take into account strength requirements, so the dimensions of the heat-conducting member (3a) in the first direction (x) are installed to be 0.1 mm to 100 mm, and the first direction is perpendicular to the first wall (201), thereby taking into account strength and space requirements simultaneously.

[0229] Specifically, when the dimension T4 in the first direction of the heat-conducting member (3a), that is, the thickness of the heat-conducting member (3a), is greater, the strength of the heat-conducting member (3a) is higher; when T4 is smaller, it occupies less space. When T4 < 0.1 mm, the heat-conducting member (3a) is easily damaged under the action of an external force; and when T4 > 100 mm, it occupies excessive space, affecting energy density. Therefore, when the dimension T4 in the first direction of the heat-conducting member (3a) is between 0.1 mm and 100 mm, the space utilization can be improved by ensuring strength.

[0230] In some embodiments, a heat-conducting member (3a) is installed in the battery (100) such that it is heat-conductively connected to the first wall (201) of the battery cell (20) having the largest surface area, thereby conducting heat from the battery cell (20), and the surface of the heat-conducting member (3a) connected to the first wall (201) is made into an insulating surface to avoid electrical connection between the heat-conducting member (3a) and the battery cell (20), thereby ensuring electrical insulation within the battery (100); the dimensions of the heat-conducting member (3a) in the first direction (x) perpendicular to the first wall (201) are 0.1 mm to 100 mm. Here, the heat-conducting member (3a) includes a separator (33) connected to the first wall (201) of each battery cell (20) among a plurality of battery cells (20) arranged along the second direction (y), and the second direction is parallel to the first wall (201). In this way, there is no need to install additional structures such as beams in the center of the box body (10) of the battery (100), thereby greatly improving the utilization of space inside the battery (100) and improving the energy density of the battery (100); at the same time, electrical insulation and heat conduction within the battery (100) can be ensured by using the heat conduction member (3a) described above. Accordingly, the technical solution according to the embodiment of the present application can improve the energy density of the battery (100) while simultaneously ensuring electrical insulation and heat conduction within the battery (100), thereby improving the performance of the battery (100).

[0231] In some embodiments, the dimension T3 in the first direction (x) of the battery cell (20) and the dimension T5 in the first direction (x) of the heat-conducting member (3a) satisfy 0 < T5 / T3 ≤ 7.

[0232] When T5 / T3 is too large, the heat-conducting member (3a) occupies a larger space, affecting the energy density. Additionally, if the heat conduction of the heat-conducting member to the battery cell (20) is too rapid, it may cause safety issues. For example, when thermal runaway occurs in one battery cell (20), it may cause thermal runaway in another battery cell (20) connected to the same heat-conducting member. When 0 < T5 / T3 ≤ 7, the energy density of the battery (100) and the safety performance of the battery (100) can be guaranteed.

[0233] In some embodiments, the dimension T3 in the first direction (x) of the battery cell (20) and the dimension T5 in the first direction (x) of the heat-conducting member (3a) further satisfy 0 < T5 / T3 ≤ 1, thereby further improving the energy density of the battery (100) and ensuring the safety performance of the battery (100).

[0234] In some selectable embodiments, the weight M1 of the battery cell (20) and the weight M2 of the heat-conducting member (3a) are 0 <M2 / M1≤20을 충족한다.

[0235] When M2 / M1 is too large, gravimetric energy density is lost. 0 <M2 / M1≤20일 때, 전지(100)의 중량 에너지 밀도를 보장하고 전지(100)의 안전 성능을 보장할 수 있다.

[0236] Optionally, in one embodiment of the present application, the weight M1 of the battery cell (20) and the weight M2 of the heat-conducting member (3a) further satisfy 0.1 ≤ M2 / M1 ≤ 1, thereby further improving the energy density of the battery (100) and ensuring the safety performance of the battery (100).

[0237] In some embodiments, the area S3 of the first wall (201) and the surface area S4 of the heat-conducting member (3a) connected to the first wall (201) of a plurality of battery cells (20) in a row satisfy 0.2 ≤ S4 / S3 ≤ 30.

[0238] S4 is the total surface area of ​​one side of the heat-conducting member (3a) connected to the battery cell (20). When S4 / S3 is too large, it affects the energy density. When S4 / S3 is too small, the heat conduction effect is too weak, which affects the safety performance. When 0.2 ≤ S4 / S3 ≤ 30, the energy density of the battery (100) and the safety performance of the battery (100) can be guaranteed.

[0239] Optionally, S4 and S3 further satisfy 2≤S4 / S3≤10, thereby further improving the energy density of the battery (100) and ensuring the safety performance of the battery (100).

[0240] 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 / (kg2*℃) ≤ C / M2 ≤ 100 KJ / (kg2*℃).

[0241] When C / M2 < 0.02KJ / (kg2*℃), the heat-conducting member (3a) absorbs more energy, so the temperature of the battery cell (20) is too low, and lithium precipitation may occur; when C / M2 > 100KJ / (kg2*℃), the heat-conducting member (3a) has poor thermal conductivity and cannot remove heat in a timely manner. When 0.02KJ / (kg2*℃) ≤ C / M2 ≤ 100KJ / (kg2*℃), the safety performance of the battery (100) can be guaranteed.

[0242] Optionally, C and M2 are

[0243] By further satisfying the relationship 0.3KJ / (kg2*℃)≤C / M2≤20KJ / (kg2*℃), the safety performance of the battery (100) can be further improved.

[0244] In some embodiments, the battery (100) may include a plurality of battery modules (100a). The battery modules (100a) may include at least one row of a plurality of battery cells (20) arranged along a second direction (y) and at least one heat-conducting member (3a), and the at least one row of battery cells (20) and at least one heat-conducting member (3a) may be installed alternately in a first direction (x). That is, for each battery module (100a), the row of battery cells and the heat-conducting member (3a) are installed alternately in the first direction (x), and a plurality of battery modules (100a) are housed within a box body (10) to form the battery (100).

[0245] Optionally, the battery module (100a) includes two rows of battery cells (20), and one heat-conducting member (3a) is installed in the two rows of battery cells (20). The heat-conducting member (3a) is not installed between adjacent battery modules (100a), and thus, the embodiment may install fewer heat-conducting members (3a) within the battery (100), while ensuring that each battery cell (20) can be connected to the heat-conducting member (3a) at the same time.

[0246] Optionally, a plurality of battery modules (100a) are arranged along a first direction (x), and a gap is provided between adjacent battery modules (100a), and there is no heat-conducting member (3a) between adjacent battery modules (100a), and the gap between adjacent battery modules (100a) can provide an expansion space for the battery cell (20).

[0247] Optionally, a fixing structure (103) is installed 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 shown in FIG. 19, the fixing structure (103) may include a fixing member (104), the fixing member (104) is fixed and connected to the end of the heat-conducting member (3a) and is also connected to a battery cell (20) located at the end of the heat-conducting member (3a) to improve the fixing effect of the battery cell (20).

[0248] Optionally, the battery cell (20) can be fixed by being adhered to the box body (10). Optionally, adjacent battery cells (20) among the battery cells (20) in each row can be adhered, for example, the second wall (202) of two adjacent battery cells (20) is adhered through a structural adhesive, but the embodiments of the present application are not limited thereto. The fixing effect of the battery cell (20) can be further enhanced by fixing adjacent battery cells (20) among the battery cells (20) in each row through adhesion.

[0249] Using the battery cell (20) and heat-conducting member (3a) shown in FIGS. 10 to 13, and taking the number of battery cells (20) in a row of battery cells (20) as 2 to 20, a safety test of the battery (100) was performed according to GB 38031-2020, and the test results are as shown in Tables 4 to 7, and it can be seen that the battery (100) according to the embodiment of the present application can satisfy the safety performance requirements.

[0250] number T5 / mm T3 / mm T5 / T3 Test results 1 0.2 40 0.005 Non-ignition, non-explosion 2 0.4 50 0.008 Non-ignition, non-explosion 3 0.7 45 0.016 Non-ignition, non-explosion 4 4 10 0.4 Non-ignition, non-explosion 5 4 40 0.1 Non-ignition, non-explosion 6 45 15 3 Non-ignition, non-explosion 7 150 10 15 ignition, explosion

[0251] number M2 / Kg M1 / Kg M2 / M1 Test results 1 0.2 3 0.068 Non-ignition, non-explosion 2 0.4 2.5 0.16 Non-ignition, non-explosion 3 0.7 1.5 0.467 Non-ignition, non-explosion 4 10 1.5 6.7 Non-ignition, non-explosion 5 15 1 15 Non-ignition, non-explosion

[0252] number S4 / mm 2 S3 / mm 2 S4 / S3 Test results 1 3120 21728 0.14 ignition, explosion 2 19500 38800 0.5 Non-ignition, non-explosion 3 65000 16800 3.87 Non-ignition, non-explosion 4 130000 16576 7.84 Non-ignition, non-explosion 5 216000 9600 22.5 Non-ignition, non-explosion 6 250000 7200 34.72 ignition, explosion

[0253] number C / KJ / (Kg*℃) M2 / kg C / M2(KJ / (kg2*℃)) Test results 1 0.39 25 0.016 ignition, explosion 2 0.46 5 0.092 Non-ignition, non-explosion 3 0.88 0.5 1.76 Non-ignition, non-explosion 4 4 0.4 10 Non-ignition, non-explosion 5 4 0.1 40 Non-ignition, non-explosion 6 4 0.025 160 ignition, explosion

[0254] In some embodiments, as shown in FIG. 15 and FIG. 35, in the third direction (z), the dimension H1 of the separator plate (33) and the dimension H2 of the first wall (201) satisfy 0.1 ≤ H1 / H2 ≤ 2, and the third direction is perpendicular to the second direction and also parallel to the first wall. In this way, the space utilization inside the battery (100) can be further greatly improved, and the energy density of the battery (100) can be improved.

[0255] In the third direction (z), the dimension H1 of the separator plate (33) may be the height of the separator plate (33), and the dimension H2 of the first wall (201) may be the height of the first wall (201). The relationship between H1 and H2 satisfies 0.1 ≤ H1 / H2 ≤ 2.

[0256] When H1 / H2 < 0.1, the heat exchange area between the battery cell (20) and the separator is smaller, so the battery cell (20) cannot be cooled or heated in a timely manner, making it difficult to meet the thermal management requirements of the battery.

[0257] When H1 / H2 > 2, the thermal management requirements of the battery (100) can be met, but the separator (33) occupies more space, wasting space utilization in the third direction (z), making it difficult to guarantee the energy density requirements of the battery (100).

[0258] Optionally, 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.

[0259] In some examples, the separator (33) is a thermal management member (3b) for controlling the temperature of the battery cell (20), and the height of the thermal management member (3b) in the third direction (z) is H1.

[0260] Optionally, the thermal management member (3b) may be a water cooling plate for cooling the battery cell (20) during the rapid charging process or for heating the battery cell (20) when the temperature is too low.

[0261] Optionally, the thermal management member (3b) can be made of a material with excellent thermal conductivity, such as a metal material like aluminum.

[0262] In some embodiments, the dimensions H1 of the separator plate (33) and the dimensions H2 of the first wall (201) satisfy 0.3 ≤ H1 / H2 ≤ 1.3. In this way, it can be ensured that the temperature of the battery cell (20) does not exceed 55°C during the rapid charging process.

[0263] Optionally, H1 / H2 may be 0.3, or 0.5, or 0.8, or 1.0, or 1.1, or 1.3, etc.

[0264] Optionally, in one embodiment of the present application, the heat exchange area between the first wall (201) and the separator is S, and the relationship between the capacity Q of the battery cell (20) and the heat exchange area S is 0.03 Ah / cm² ≤ Q / S ≤ 6.66 Ah / cm² 2 satisfies.

[0265] The heat exchange area S may be the contact area between the first wall (201) and the separator plate (33), and the heat exchange area S satisfies S=H1*L, where L is the dimension along the second direction (y) of each battery cell (20).

[0266] Q / S<0.03Ah / cm 2 When this happens, the heat exchange area S is sufficiently large to satisfy the thermal management requirements of the battery, but the space occupied by the separator plate (33) is too large to satisfy the energy density requirements of the battery (100).

[0267] Q / S > 6.66 Ah / cm 2 In this case, the heat exchange area S is smaller, so the heat of the battery cell (20) cannot be conducted to the outside in a timely manner through the separator (33), and the battery cell (20) cannot be cooled quickly in a timely manner, making it difficult to meet the heat management requirements.

[0268] By adjusting the relationship between the heat exchange area S and the capacity Q of the battery cell (20), the temperature of the battery cell (20) can be maintained within an appropriate range during the charging process of the battery, especially during the rapid charging process; and also, when the capacity Q of the battery cell is constant, the thermal management requirements of the battery can be flexibly met by adjusting the heat exchange area S.

[0269] In one possible embodiment, the dimension H1 of the separator 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 rapid charging process of the battery.

[0270] A charging test was performed on the battery, and the test results are shown in Table 8.

[0271] Temperature test during the charging process of battery cells of different specifications and thermal management components Q(Ah) T3(mm) L(cm) H2(cm) H1(cm) H1 / H2 Q / (H1*L)(Ah / cm 2 ) Maximum temperature T during charging process 240 71.25 17.4 20 26 1.3 0.5305 T≤50℃ 280 88 20.3 11.2 20 1.7857 0.6897 T≤50℃ 280 88 20.3 11.2 10.2 0.9107 1.3523 T≤50℃ 280 88 20.3 11.2 5 0.4464 2.7586 50℃＜T≤55℃ 280 88 20.3 11.2 1.1 0.0893 13.7931 T＞55℃ 203 85.8 14.8 10.3 20 1.9417 0.6858 T≤50℃ 203 85.8 14.8 10.3 10.2 0.9903 1.3447 T≤50℃ 203 85.8 14.8 10.3 7 0.6796 1.9595 T≤50℃ 203 85.8 14.8 10.3 2.2 0.1942 6.2346 50℃＜T≤55℃ 156 44.3 22 10.2 15 1.4706 0.4727 T≤50℃ 156 44.3 22 10.2 10.2 1.0000 0.6952 T≤50℃ 156 44.3 22 10.2 5 0.4902 1.4182 T≤50℃ 102 52 14.8 9.5 20 0.2105 0.0345 T≤50℃ 102 52 14.8 9.5 10.2 0.1074 0.0676 T≤50℃ 5 12.5 12 6.5 12 1.8462 0.0347 T≤50℃ 5 12.5 12 6.5 5 0.7692 0.0833 T≤50℃

[0272] In some embodiments, as shown in FIG. 12 and FIG. 32, a hollow cavity (30a) is installed inside the separator plate (33).

[0273] In this way, the separator plate (33) with the hollow cavity structure installed has an absorption deformation capacity, so that it can absorb the amount of expansion deformation of the battery cell (20) and improve the performance of the battery (100); in other words, the hollow cavity (30a) can allow the separator plate (33) to have a larger compression space in the first direction (x), thereby providing a larger expansion space to the battery cell (20).

[0274] Additionally, the hollow cavity (30a) can ensure the strength of the separator plate (33) while reducing the weight of the separator plate, and can be applied, for example, when the thickness of the separator plate (33) is greater.

[0275] Optionally, the hollow cavity (30a) may be used to accommodate a heat exchange medium to control the temperature of the battery cell (20), thereby allowing the temperature of the battery cell (20) to be controlled to an appropriate range from time to time, which can improve the stability and safety of the battery cell (20). Accordingly, the hollow cavity (30a) may also be referred to as a heat exchange cavity, and the hollow cavity (30a) corresponds to one or more flow paths (30c) for accommodating the heat exchange medium.

[0276] It should be understood that the fluid mentioned herein may be a liquid such as water that can control temperature and does not chemically react with the hollow cavity (30a) material, and that the present application is not limited thereto.

[0277] In some embodiments, as illustrated in FIG. 12 and FIG. 32, in the first direction (x), the dimensions of the hollow cavity (30a) are W, and the capacity Q of the battery cell (20) and the dimensions W of the hollow cavity (30a) satisfy 1.0 Ah / mm ≤ Q / W ≤ 400 Ah / mm, and the first direction (x) is perpendicular to the first wall (201), thereby making it convenient to effectively use the separator (33) to prevent heat diffusion between the battery cells (20). By rapidly cooling the battery cell (20) that is too hot, the heat of the battery cell (20) can be diffused and transferred to the adjacent battery cell (20), thereby preventing the temperature of the adjacent battery cell (20) from becoming too hot.

[0278] When Q / W > 400Ah / mm, the dimension W of the hollow cavity (30a) is smaller, and the volume of fluid that can be accommodated or flow in the hollow cavity (30a) is smaller, so the battery cell (20) cannot be cooled in a timely manner. As such, when the temperature of a battery cell (20) is too high, the battery cell (20) is not cooled in a timely manner, and the heat of the battery cell (20) spreads to an adjacent battery cell (20), causing the temperature of the adjacent battery cell (20) to become too high and an abnormality to occur, which affects the performance of the entire battery (100).

[0279] When Q / W < 1.0Ah / mm, the dimension W of the hollow cavity (30a) is larger, and the volume of fluid that can be accommodated or flow in the hollow cavity (30a) is larger, so that the battery cell (20) can be sufficiently cooled. However, as the dimension of the hollow cavity (30a) increases, the space occupied by the separator (33) increases, so the energy density of the battery (100) cannot be guaranteed, and at the same time, the separator (33) which is too large in volume also causes an increase in cost.

[0280] A hollow cavity (30a) may be formed by a pair of heat conduction plates (333) of a separator (33), and the dimension W of the hollow cavity (30a) along the first direction (x) may be the distance along the first direction (x) between the inner walls of the two heat conduction plates (333). The larger the dimension W of the hollow cavity (30a), the larger the volume of the hollow cavity (30a) becomes, and the larger the volume of fluid that can be contained or flow in the hollow cavity (30a), thus the faster the heat transfer between the battery cell (20) and the separator (33). For example, when the separator (33) is a water-cooled plate, the larger the dimension W of the hollow cavity (30a), the faster the heat of the battery cell (20) is lost, thus cooling the battery cell (20) faster, which can prevent the heat of the battery cell (20) from spreading to adjacent battery cells (20). Optionally, the fluid may flow circulatingly to achieve a better temperature control effect. Optionally, the fluid may be water, a mixture of water and ethanol, a refrigerant, or air.

[0281] FIG. 36 is a schematic diagram of a structure in which a battery cell and a thermal management member are connected according to one embodiment of the present application. FIG. 37 is a cross-sectional view along the AA direction in FIG. 36, and FIG. 38 is an enlarged schematic diagram of the G region in FIG. 37. In one embodiment of the present application, FIG. 36 to FIG. 38 combined, the dimension T3 along the first direction (x) of the battery cell (20) and the dimension H along the third direction of the thermal management member (3b) satisfy 0.03 ≤ T3 / H ≤ 5.5, and the third direction is perpendicular to the first direction and the second direction.

[0282] The dimension T3 along the first direction (x) of the battery cell (20) may be the thickness T3 of the battery cell (20), and the thickness T3 of the battery cell (20) is related to the capacity Q of the battery cell (20), and the larger the thickness T3, the larger the capacity Q becomes.

[0283] The dimension H1 along the third direction of the separator (33) may be the height H along the third direction of the thermal management member (3b), and as H increases, the volume of the thermal management member (3b) increases, the occupied space increases, and at the same time, the thermal management capability becomes stronger. For example, when the thermal management member (3b) is a water-cooled plate, as H increases, the cooling capability for the battery cell (20) becomes stronger, and the heat of the battery cell (20) can be effectively prevented from spreading to adjacent battery cells (20).

[0284] When T3 / H < 0.03, the dimension H along the third direction of the thermal management member (3b) is larger, which can sufficiently satisfy the requirement for preventing heat diffusion of the battery cell (20), but it is difficult to satisfy the requirement for the energy density of the battery (100), and at the same time, the larger volume of the thermal management member (3b) also results in an increase in production costs.

[0285] When T3 / H > 5.5, the thermal management member (3b) is unable to meet the thermal management requirements for the battery cell (20), that is, it cannot conduct the heat of the battery cell (20) to the outside in a timely manner, and the heat spreads to adjacent battery cells (20), causing an abnormal temperature in other battery cells (20), and further affecting the performance of the battery (100).

[0286] In some embodiments, the dimension H1 along the third direction of the separator plate (33) is 15 mm to 300 mm. In this way, the separator plate (33) can take into account the requirements for strength and thermal management performance.

[0287] In some embodiments, the dimension W of the hollow cavity (30a) is 0.8 mm to 50 mm. In this way, the requirements for strength and thermal management performance can be considered together.

[0288] In the following, a combination method of a two-row battery cell (20) and two separators (33) was adopted, and a thermal diffusion test of the battery (100) was performed in accordance with GB38031-2020, and the test results are as shown in Table 9.

[0289] Thermal diffusion test of battery cells and separators of different specifications (Q / Ah) (T3 / mm) (H / mm) (W / mm) Q / W T3 / H Whether or not heat spread 280 88 260 50 5.6 0.3385 X 280 88 260 6 46.6667 0.3385 X 280 88 102 6 46.6667 0.8627 X 280 88 102 3 93.3333 0.8627 X 280 88 102 0.8 350 0.8627 X 280 88 30 6 46.6667 2.9333 X 280 88 13 0.6 466.6667 6.7692 O 248 66.5 80 2 124 0.8313 X 248 66.5 102 0.8 310 0.652 X 169 70 102 3 56.6666 0.6863 X 70 28.5 102 2 35 0.2794 X 180 79 80 2 90 0.9875 X 117 33.2 102 0.8 146.25 0.3255 X 5 12.5 50 3 1.6667 0.25 X 5 12.5 150 3 1.6667 0.0833 X 5 12.5 102 0.8 6.25 0.1225 X

[0290] In some embodiments, as illustrated in FIGS. 32, 33 and 38, the separator (33) further comprises a pair of heat conduction plates (333) installed oppositely along a first direction, and a hollow cavity (30a) installed between the pair of heat conduction plates (333), and the first direction is perpendicular to the first wall (201).

[0291] For example, each heat conduction plate (333) may be extended along a second direction, and two heat conduction plates (333) may be opposite along a first direction to form a hollow cavity (30a) between the two heat conduction plates (333), and the hollow cavity (30a) may be formed as a flow path for a heat exchange medium so that the separator plate (33) is formed as a heat conduction member (3a) or a heat management member (3b).

[0292] In some embodiments, as shown in FIG. 32, the dimension D in the first direction (x) of the heat conduction plate (333) is 0.1 mm to 5 mm.

[0293] When the dimension D in the first direction of the heat conduction plate (333) is too small, the internal space of the separator plate (33) is constant, and the hollow cavity (30a) occupies most of the space of the separator plate (33). In this case, the rigidity of the separator plate (33) is very low, so the structural strength of the battery (100) cannot be effectively improved. When the dimension D in the first direction of the heat conduction plate (333) is too large, the hollow cavity (30a) inside the separator plate (33) is very small, so the amount of fluid that can be accommodated is very small, and thus the temperature of the battery cell (20) cannot be effectively controlled, so the value of D is set to 0.1mm to 5mm.

[0294] Optionally, the dimension D in the first direction of a pair of heat conduction plates (333) of the separator plate (33) may be the same or different.

[0295] Optionally, the two heat conduction plates (333) can be made of a material with excellent thermal conductivity, such as a metal material like aluminum.

[0296] In some embodiments, as shown in FIG. 33 and FIG. 38, the separator (33) further includes reinforcing ribs (334), which are installed between a pair of heat conduction plates (333) to improve the structural strength of the separator (33).

[0297] Optionally, the number of reinforcing ribs (334) is one, and thus one or more hollow cavities (30a) can be formed between a pair of heat conduction plates (333).

[0298] Optionally, when there are multiple hollow cavities (30a), different hollow cavities (30a) may be independent of each other and may be connected through an adapter.

[0299] When the reinforcing rib (334) is connected to only one of the pair of heat conduction plates (333), the reinforcing rib (334) is a cantilever with one end connected to the heat conduction plate (333), and the hollow cavity (30a) may correspond to one flow path (30c); when the reinforcing rib (334) is connected to each of the pair of heat conduction plates (333), the hollow cavity (30a) may correspond to multiple flow paths (30c). The number of reinforcing ribs (334) may be specifically installed as required, and the embodiments of the present application are not limited thereto.

[0300] In some embodiments, as shown in FIG. 33 and FIG. 45, the reinforcing rib (334) is connected to at least one of a pair of heat conduction plates (333) to further ensure the structural strength of the separator plate (33).

[0301] Optionally, as shown in FIG. 33, the reinforcing rib (334) may be installed on only one heat conduction plate (333), or the reinforcing rib (334) may be installed between a pair of heat conduction plates (333) and connected to the pair of heat conduction plates (333).

[0302] Optionally, as shown in FIG. 33, when a reinforcing rib (334) is connected to a pair of heat conduction plates (333), the angle between the reinforcing rib (334) and the heat conduction plate (333) may be acute, providing more expansion space to the battery cell (20); as shown in FIG. 33, when a reinforcing rib (334) is connected to a single heat conduction plate (333), the angle between the reinforcing rib (334) and the heat conduction plate (333) may be right, allowing the separator to withstand greater pressure.

[0303] Optionally, the reinforcing ribs (334) may be irregular in shape, such as C-shaped, wavy, or cross-shaped, which can effectively absorb expansion, increase spoiler, and improve heat exchange effect.

[0304] In some embodiments, as illustrated in FIG. 45, the reinforcing rib (334) includes a first reinforcing rib (3341) with both ends connected to a pair of heat conduction plates (333), the first reinforcing rib (3341) is used to support a pair of heat conduction plates (333), and when the heat conduction plates (333) are deformed to absorb the expansion force of the battery cell (20), the first reinforcing rib (3341) is deformed so that at least a portion of the pair of heat conduction plates (333) can be adapted to move in a direction close to both sides along a first direction (x).

[0305] Here, the first reinforcing rib (3341) is installed at an angle with respect to the first direction (x), and the angle of contact between the first reinforcing rib (3341) and one of the pair of heat conduction plates (333) is less than 90°, so that the bendability of the first reinforcing rib (3341) can be improved and it can be deformed better to meet the expansion force absorption requirements of the separator plate (33), so that the deformation space is small due to the honest shape and the risk of easy breakage and failure can be avoided.

[0306] Optionally, the first reinforcing rib (3341) may be one or more, and a plurality of first reinforcing ribs (3341) may be spaced apart along the third direction (z); wherein the spacing dimension between two adjacent first reinforcing ribs (3341) may be the same or different.

[0307] Optionally, the material of the first reinforcing rib (3341) can be manufactured into a reinforcing rib structure, ensuring a supporting role while simultaneously implementing a lightweight design of the separator plate (33), thereby implementing a lightweight design of the entire battery (100).

[0308] Optionally, the first reinforcing rib (3341) is connected to a pair of heat conduction plates (333), and the first reinforcing rib (3341) is also extended along a second direction (y) to increase the connection area between the first reinforcing rib (3341) and each heat conduction plate (333) and improve the support strength.

[0309] Optionally, the first reinforcing rib (3341) is a plate-like structure, which allows the first reinforcing rib to deform better, thereby satisfying the requirement for the separator to absorb the expansion force of the battery cell (20); additionally, it is advantageous for production and processing and improves manufacturing efficiency.

[0310] In some embodiments, as shown in FIG. 45, the angle of contact between the first reinforcing rib (3341) and the first direction (x) is 30° to 60°, and the angle of contact between the first reinforcing rib (3341) and one of the pair of heat conduction plates (333) is 30° to 60°, which is advantageous for better deformation while satisfying support requirements and also is not easy to break.

[0311] Optionally, when there are multiple first reinforcing ribs (3341), the inclination direction of two adjacent first reinforcing ribs (3341) may be the same or different.

[0312] In some embodiments, as illustrated in FIG. 45, the reinforcing rib (334) further comprises a second reinforcing rib (3342), one end of the second reinforcing rib (3342) is connected to one of a pair of heat conduction plates (333), and the other end of the second reinforcing rib (3342) is spaced apart from the other of the pair of heat conduction plates (333), for example, the extension dimension of the second reinforcing rib (3342) in the first direction (x) is smaller than the distance between the pair of heat conduction plates (333).

[0313] Thus, by installing the second reinforcing rib (3342) described above, it is possible to achieve a better support effect by working together with the first reinforcing rib (3341), and also control the deformation range of the separator plate (33). When the second reinforcing rib (3342) of one of the pair of heat conduction plates (333) comes into contact with the other, the deformation of the separator plate (33) is further limited, blockage of the flow path (30c) corresponding to the hollow cavity (30a) is avoided, and the effectiveness of the flow path (30c) is ensured, thereby ensuring the effectiveness of the separator plate (33).

[0314] Optionally, a pair of heat conduction plates (333) are each a first heat conduction plate (3331) and a second heat conduction plate (3332), and a second reinforcing rib (3342) may be installed on the first heat conduction plate (3331) and on the second heat conduction plate (3332), and, exemplarily, the second reinforcing rib (3342) is installed on both the first heat conduction plate (3331) and the second heat conduction plate (3332).

[0315] In some embodiments, as illustrated in FIG. 45, a second reinforcing rib (3342) is installed between two adjacent first reinforcing ribs (3341) in the third direction (z). Optionally, one of the two adjacent second reinforcing ribs (3342) is installed on the first heat conduction plate (3331) and the other is installed on the second heat conduction plate (3332) to ensure that the first heat conduction plate (3331) and the second heat conduction plate (3332) receive a uniform force while avoiding excessive weight.

[0316] In some embodiments, as shown in FIG. 45, the second reinforcing rib (3342) extends along the first direction (x) and also protrudes from one of the pair of heat conduction plates (333), simplifying the structure of the second reinforcing rib (3342) and making it convenient for processing.

[0317] Optionally, the second reinforcing rib (3342) is a polygonal columnar body, which allows the second reinforcing rib (3342) to have a sufficient cross-sectional area, and when the separator plate (33) absorbs the expansion force of the battery cell (20) and the second reinforcing rib (3342) installed on one of the pair of heat conduction plates (333) is deformed to come into contact with the other, the second reinforcing rib (3342) has a sufficient contact area, thereby better improving the support capacity and ensuring the effectiveness of the separator plate (33) by avoiding contact between the two heat conduction plates (333) due to damage or even failure of the second reinforcing rib (3342).

[0318] In some embodiments, as shown in FIG. 45, the first reinforcing rib (3341) and the second reinforcing rib (3342) are spaced apart to ensure that the two heat conduction plates (333) receive a more uniform force.

[0319] In some embodiments, along the third direction (z) (e.g., the height direction of the box body (10)), the first reinforcing rib (3341) and the second reinforcing rib (3342) are alternately distributed, for example, two adjacent first reinforcing ribs (3341) and second reinforcing ribs (3342) may be alternately installed on the first heat conduction plate (3331) and the second heat conduction plate (3332), and of course, the position of the second reinforcing rib (3342) may be installed according to a certain arrangement rule.

[0320] For example, in the third direction (z), one of the two adjacent second reinforcing ribs (3342) is installed on the first heat conduction plate (3331) and the other is installed on the second heat conduction plate (3332) to ensure that the first heat conduction plate (3331) and the second heat conduction plate (3332) receive a uniform force while not bearing too much weight.

[0321] By installing it in this form, not only can the uniformity of the support effect for the two heat conduction plates (333) be ensured, but also, blockage can be prevented in each part along the second direction (y) of the flow path (30c) corresponding to the hollow cavity (30a), thereby ensuring the effectiveness of the flow path (30c).

[0322] In some embodiments, as shown in FIG. 32 and FIG. 45, in the first direction (x), the thickness D of the heat conduction plate (333) and the dimension W of the hollow cavity satisfy 0.01≤D / W≤25, thereby simultaneously considering the requirements for strength and thermal management performance.

[0323] Specifically, when the dimension W of the hollow cavity (30a) is larger, the fluid flow resistance in the hollow cavity (30a) is lower, so the heat exchange amount per unit time of the separator plate (33) can be improved; when the thickness D of the heat conduction plate (333) is larger, the strength of the separator plate (33) is higher. When D / W is less than 0.01, the dimension W of the hollow cavity (30a) is sufficiently large but takes up excessive space; or in the space of the separator plate (33), the thickness D of the heat conduction plate (333) is too thin and may lack strength, for example, it may not be able to meet the vibration shock requirements of the battery (100), and there may even be cases where the separator plate (33) is crushed during initial grouping. When D / W≥25, the thickness D of the heat conduction plate (333) is sufficiently thick, but the dimension W of the hollow cavity (30a) in the space of the designated separator plate (33) becomes too small, and the fluid resistance of the fluid in the hollow cavity (30a) increases, so the heat exchange performance is reduced or the hollow cavity (30a) may become clogged during use; at the same time, the thickness of the wall of the heat conduction plate (333) is too large, so the force generated by the expansion of the battery cell (20) cannot satisfy the crushing force on the separator plate (33) corresponding to the expansion space required for the battery cell (20), that is, the separator plate (33) cannot provide the expansion space required for the battery cell (20) in a timely manner, thereby accelerating the reduction in capacity of the battery cell (20). Accordingly, when the thickness D of the heat conduction plate (333) and the dimension W of the hollow cavity (30a) satisfy 0.01≤D / W≤25, the performance of the battery (100) can be guaranteed by simultaneously considering the requirements for strength and thermal management performance.

[0324] Optionally, when 0.01≤D / W≤0.1, the fluid may be a solid-liquid phase change material or a liquid working medium, and the separator (33) may be a sac with an outer layer made of a membrane material and may be reinforced by filling the inside with a skeletal structure, and the solution may be used when the strength requirement is lower or the compression performance requirement of the separator (33) is higher.

[0325] Optionally, when in the range of 0.1≤D / W≤1, a fluid working medium convection heat exchange or gas-liquid phase change cooling solution may be adopted inside the separator (33), and a liquid working medium is used as a heat exchange medium to ensure the heat exchange performance of the separator (33).

[0326] Optionally, when 1≤D / W≤25, the separator (33) may adopt a gas-liquid phase change cooling solution, increase the total pressure through internal gap adjustment, ensure that the liquid working medium exists in liquid form inside the separator (33), prevent the coexistence of two gas-liquid states due to pressure loss, and provide heat exchange performance; at the same time, the thickness D of the heat conduction plate (333) is sufficiently thick so that the rupture of the separator (33) due to pressure rise caused by vaporization of the internal working medium during heating can be prevented.

[0327] Optionally, the thickness D of the heat conduction plate (333) and the dimension W of the hollow cavity (30a) further satisfy 0.05≤D / W≤15 and further satisfy 0.1≤D / W≤1, thereby better considering space, strength and thermal management, and further improving the performance of the battery (100).

[0328] Optionally, the dimension T1 in the first direction (x) of the separator plate (33) is 0.3 mm to 100 mm.

[0329] T1 is the total thickness of the thermal management member separator plate (33), i.e., T1 = 2 * D + W. If T1 is too large, it takes up excessive space, and if T1 is too small, the strength is too low or the hollow cavity (30a) is too narrow, which affects the thermal management performance. Therefore, when the total thickness T1 of the separator plate (33) is 0.3 mm to 100 mm, the performance of the battery (100) can be guaranteed by considering space, strength, and thermal management together.

[0330] Optionally, the thickness D of the heat conduction plate (333) is 0.1 mm to 25 mm.

[0331] If the thickness D of the heat conduction plate (333) is too large, it takes up excessive space and the separator plate (33) cannot provide the necessary expansion space for the battery cell (20) in a timely manner, and if D is too small, the strength becomes too low. Therefore, when the thickness D of the heat conduction plate (333) is 0.1 mm to 25 mm, the performance of the battery (100) can be ensured by considering the space, strength, and the expansion requirements of the battery cell (20) together.

[0332] Optionally, the dimension W in the first direction of the hollow cavity (30a) is 0.1 mm to 50 mm.

[0333] Specifically, the dimension W of the hollow cavity (30a) must be at least larger than the dimension of impurity particles that may occur inside to avoid clogging during the application process, and if the dimension W of the hollow cavity (30a) is too small, the fluid resistance of the fluid in the hollow cavity (30a) increases and heat exchange performance is reduced, so the dimension W of the hollow cavity (30a) is 0.1 mm or larger. If the dimension W of the hollow cavity (30a) is too large, it takes up excessive space or lacks strength. Therefore, when the dimension W of the hollow cavity (30a) is between 0.1 mm and 50 mm, the performance of the battery (100) can be guaranteed by considering space, strength, and thermal management performance together.

[0334] Optionally, the dimension T1 in the first direction (x) of the separator plate (33) and the area S3 of the first wall (201) are 0.03 mm -1 ≤T1 / S3*1000≤2mm -1 satisfies.

[0335] T1 and S3 satisfy the conditions described above, thereby satisfying the heat exchange performance requirements and dimensional space requirements of the battery cell (20). Specifically, when the area S3 of the first wall (201) of the battery cell (20) is larger, the cooling area is larger, which can reduce the heat transfer resistance of the separator (33) to the surface of the battery cell (20); and when the total thickness T1 of the separator (33) is larger, the strength can be improved. T1 / S3*1000 is 0.03mm -1 If it is smaller, the area S3 of the first wall (201) of the battery cell (20) is sufficiently large, but the separator (33) is too thin and lacks strength, and problems such as breakage or cracking of the separator (33) may occur during use. T1 / S3*1000 is 2mm -1 If it is larger, the separator (33) is sufficiently thick, but the area S3 of the first wall (201) of the battery cell (20) is too small, so there is a risk that the cooling surface that the separator (33) can supply to the battery cell (20) is insufficient, and thus the heat dissipation requirements of the battery cell (20) cannot be met. Therefore, the total thickness T1 of the separator (33) and the area S3 of the first wall (201) are 0.03mm -1 ≤T1 / S3*1000≤2mm -1 When satisfying the requirements for strength and thermal management performance, the performance of the battery (100) can be guaranteed by simultaneously considering the requirements for strength and thermal management performance.

[0336] Optionally, the separator plate (33) further comprises a reinforcing rib (334) installed between a pair of heat conduction plates (333), and the thickness X of the reinforcing rib (334) is greater than or equal to (-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, the minimum thickness X of the reinforcing rib (334) may be (-0.0005*F+0.4738)mm.

[0337] The thickness X of the reinforcing rib (334) is related to the tensile strength of the material. According to the relationship described above, in order to meet the external force requirements of the separator plate (33), the thickness X of the internal reinforcing rib (334) becomes thinner as a material with higher strength is selected, thereby saving space and improving energy density. Optionally, the thickness X of the reinforcing rib (334) may be 0.2 mm to 1 mm.

[0338] Using the battery cell (20) and separator (33) illustrated in FIG. 45, a simulation test of the heating rate and deformation force of the heat management member was performed, and the test results are shown in Table 10. In Table 10, L is the dimension in the second direction (y) of the battery cell (20), T3 is the dimension in the first direction (x) of the battery cell (20), and H2 is the dimension in the third direction (z) of the first wall (201) of the battery cell (20), and the third direction is perpendicular to the first direction (x) and the second direction (y).

[0339] T3 / mm L / mm H2 / mm T1 / mm D / mm W / mm D / W T1 / S3*1000mm -1 Heating rate °C / min Deformation N 71 1000 26.5 4 1.95 0.1 19.5 0.056338028 <0.5 >100000 100 960 26.5 4 1.8 0.4 4.5 0.041666667 <0.5 >100000 71 120 26.5 5 2.45 0.1 24.5 0.58685446 <0.5 >100000 71 120 26.5 8 3 2 1.5 0.938967136 <0.5 >100000 85.9 120 12.5 3 1.45 0.1 14.5 0.291036088 <0.5 >100000 91 148 26.5 3 1.45 0.1 14.5 0.222750223 <0.5 >100000 112.5 148 85.8 5 2.25 0.5 4.5 0.3003003 <0.5 >100000 95 148 52 5 2.25 0.5 45. 0.355618777 <0.5 >100000 85 173 42 4 1.75 0.5 3.5 0.272016321 <0.5 [10000,100000] 199.7 173.6 53.5 4 1.75 0.5 3.5 0.115380444 <0.5 [10000,100000] 201.7 173.6 28.6 12 2 8 0.25 0.342709093 [0.5,1.6] [10000,100000] 199.7 173.6 53.5 10 1.5 7 0.214285714 0.28845111 [0.5,1.6] [10000,100000] 97.5 148 28.5 3 0.5 2 0.25 0.207900208 [0.5,1.6] [10000,100000] 102.85 148 79 3 0.4 2.2 0.181818182 0.207900208 [0.5,1.6] [10000,100000] 97 148 79 3 0.4 2.2 0.181818182 0.208971858 [0.5,1.6] [10000,100000] 199.7 173.6 71.25 4 1 2 0.5 0.115380444 [0.5,1.6] [10000,100000] 30 200 10 2 0.625 0.75 0.833333333 0.333333333 [0.5,1.6] [10000,100000] 55 55 13.5 5 0.5 4 0.125 1.652892562 [0.5,1.6] [10000,100000] 63.4 70 35 6 1 4 0.25 1.351960342 [0.5,1.6] [10000,100000] 112.5 203 44 6 0.25 5.5 0.045454545 0.26272578 [0.5,1.6] <10000 112.5 203 88 6 0.25 5.5 0.045454545 0.26272578 [0.5,1.6] <10000 91 148 56.5 0.3 0.1 0.1 1 0.022275022 <0.5 <10000 112.5 194 45 4 0.2 3.6 0.055555556 0.18327606 <0.5 <10000 1125. 194 70.7 4 0.2 3.6 0.055555556 0.18327606 <0.5 <10000 200 200 85.8 60 5 50 0.1 1.5 [0.5,1.6] ＞10000

[0340] In some embodiments, as illustrated in FIGS. 47, 48, 50 and 51, a separator (33) is provided with a medium inlet (3412) and a medium outlet (3422), and a hollow cavity (30a) is connected to the medium inlet (3412) and the medium outlet (3422) so that the hollow cavity (30a) can receive a heat exchange medium to control the temperature of the battery cell (20); A cavity (30b) is installed inside the separator (33) that is separated from both the medium inlet (3412) and the medium outlet (3422), so that the cavity (30b) prevents the entry of the heat exchange medium, thereby controlling the temperature of the battery cell (20) and reducing the weight of the separator (33), thereby enabling the lightweighting of the separator (33). Furthermore, the phenomenon in which the weight of the separator (33) increases due to the heat exchange medium entering the cavity (30b) during use can be mitigated, so that the weight of the battery (100) equipped with such a separator (33) can be effectively reduced, which is advantageous for improving the energy density of the battery (100) and thus improving the usage performance of the battery (100).

[0341] For example, the media inlet (3412) and the media outlet (3422) are installed at each end of the separator plate (33), and the hollow cavity (30a) and the cavity (30b) are both installed inside the separator plate (33). The hollow cavity (30a) is connected to the media inlet (3412) and the media outlet (3422), that is, both ends of the hollow cavity (30a) are connected to the media inlet (3412) and the media outlet (3422), respectively, so that the fluid medium can flow into the hollow cavity (30a) or flow out of the hollow cavity (30a). The cavity (30b) is separated from both the medium inlet (3412) and the medium outlet (3422), that is, the cavity (30b) does not form a communication relationship with both the medium inlet (3412) and the medium outlet (3422), so that the fluid medium cannot enter the cavity (30b).

[0342] The cavity (30b) installed inside the separator plate (33) may be one or multiple, and likewise the hollow cavity (30a) installed inside the separator plate (33) may be one or multiple; when there are multiple hollow cavities (30a), each hollow cavity (30a) is connected to the media inlet (3412) and the media outlet (3422), that is, both ends of the multiple hollow cavities (30a) are connected to the media inlet (3412) and the media outlet (3422), respectively. For example, in an embodiment of the present application, the hollow cavity (30a) and the cavity (30b) installed inside the separator plate (33) are all multiple.

[0343] In some embodiments, referring to FIGS. 47 and 48, the separator plate (33) comprises a main body plate (331) (or referred to as the main body part), a first bus member (341), and a second bus member (342). A hollow cavity (30a) and a cavity (30b) are installed in the main body plate (331). Along the longitudinal direction (i.e., the second direction (y)) of the main body plate (331), the first bus member (341) and the second bus member (342) are installed at each end of the main body plate (331), and a media inlet (3412) and a media outlet (3422) are installed in the first bus member (341) and the second bus member (342), respectively.

[0344] Here, both the hollow cavity (30a) and the cavity (30b) are installed inside the main body plate (331). For example, in FIG. 48, both the hollow cavity (30a) and the cavity (30b) extend along the longitudinal direction of the main body plate (331), and both ends of the hollow cavity (30a) each penetrate both ends of the main body plate (331) so that the hollow cavity (30a) can communicate with the media inlet (3412) of the first bus member (341) and the media outlet (3422) of the second bus member (342).

[0345] It must be explained that the main body plate (331), the first bus member (341), and the second bus member (342) may have an integrated structure or a powder structure, and when the main body plate (331), the first bus member (341), and the second bus member (342) have an integrated structure, the main body plate (331), the first bus member (341), and the second bus member (342) may be manufactured using a casting or injection process, and when the main body plate (331), the first bus member (341), and the second bus member (342) have a powder structure, the first bus member (341) and the second bus member (342) may be connected to both ends of the main body plate (331) by means such as bolt screw connection, locking connection, or adhesive.

[0346] In some embodiments, as shown in FIGS. 48 to 51, a passage (3151) is installed inside the main body plate (331), and the passage (3151) penetrates both ends of the main body plate (331) in the longitudinal direction of the main body plate (331). The separator plate (33) further includes a blocking member (318) connected to the main body plate (331), and the blocking member (318) blocks both ends of the passage (3151) to form a cavity (30b).

[0347] Here, blocking members (318) are installed at both ends of the passage (3151) penetrating the main body plate (331) along the longitudinal direction of the main body plate (331), and after blocking both ends of the passage (3151) through the blocking members (318), a sealed cavity (30b) is formed so that the cavity (30b) can be separated from both the medium inlet (3412) and the medium outlet (3422).

[0348] For example, the blocking member (318) may be a metal sheet, a rubber plug, or a silicone plug, and in the actual production process, different blocking members (318) may be adopted depending on the size of the passage (3151). For example, when the passage (3151) is larger, the passage (3151) may be blocked by connecting it to one end of the main body plate (331) by welding with a metal sheet, or the passage (3151) may be blocked using a rubber plug or a silicone plug. When the passage (3151) is smaller, since there is a greater difficulty in welding the metal sheet, a rubber plug or a silicone plug may be clamped inside the passage (3151) to achieve a blocking effect on the passage (3151).

[0349] In some embodiments, with reference to FIGS. 48 to 51, the blocking member (318) is detachably connected to the main body plate (331). By connecting the blocking member (318) to the main body plate (331) in a detachable manner, the blocking member (318) can be quickly disassembled and replaced. On the one hand, it is convenient to block different passages (3151) according to actual needs during use to satisfy various usage requirements, and on the other hand, the blocking member (318) can be repaired and replaced, which is advantageous for improving the service life of the separator plate (33).

[0350] For example, the blocking member (318) is engaged with one end of the passage (3151) to implement a blockage of the passage (3151). Of course, in other embodiments, the blocking member (318) may be detachably connected to the main body plate (331) in a manner such as a bolt screw connection or a snap-fit.

[0351] In FIGS. 48 to 51, the cavity (30b) is a sealed structure formed by blocking the passage (3151) inside the main body plate (331) with a blocking member (318). In another embodiment, referring to FIG. 50, the cavity (30b) may be a structure formed by integrally molding the main body plate (331). That is, the cavity (30b) is a structure having a hollow cavity inside formed through a process such as casting or stamping of the main body plate (331). That is, it must be explained that the blocking member (318) and the main body plate (331) are an integral structure.

[0352] A passage (3151) is formed inside the main body plate (331) and penetrates both ends of the main body plate (331) in the longitudinal direction of the main body plate (331). Additionally, by installing a blocking member (318) on the main body plate (331), the blocking member (318) blocks both ends of the passage (3151), thereby forming a cavity (30b) that is blocked from both the media inlet (3412) and the media outlet (3422). This structure is simple and convenient for manufacturing and processing, and the application range of the separator plate (33) can be expanded by blocking different passages (3151) according to actual demand.

[0353] In some embodiments, a first chamber is formed inside the first bus member (341) in communication with a medium inlet (3412), and a second chamber is formed inside the second bus member (342) in communication with a medium outlet (3422), and a flow path (30c) penetrates both ends of the main body plate (331) in the longitudinal direction of the main body plate (331) and communicates with the first chamber and the second chamber.

[0354] Here, a first chamber is formed inside the first bus member (341) and is connected to a medium inlet (3412). That is, a first chamber is formed inside the first bus member (341), and the medium inlet (3412) penetrates the chamber wall of the first chamber so that the first bus member (341) is mounted on one end of the main body plate (331). At this time, the flow path (30c) penetrating the end of the main body plate (331) is connected to the first chamber inside the first bus member (341), so that a plurality of flow paths (30c) are all connected to the first chamber of the first bus member (341), thereby connecting the plurality of flow paths (30c) to the medium inlet (3412).

[0355] Likewise, a second chamber is formed inside the second bus member (342) and is connected to a medium outlet (3422). That is, a second chamber is formed inside the second bus member (342), and the medium outlet (3422) penetrates the chamber wall of the second chamber so that the second bus member (342) is mounted on one end of the main body plate (331). At this time, the flow path (30c) penetrating one end of the main body plate (331) is connected to the second chamber inside the second bus member (342), so that all of the multiple flow paths (30c) are connected to the second chamber of the second bus member (342), thereby connecting all of the multiple flow paths (30c) and the medium outlet (3422).

[0356] It must be explained that the cavity (30b) is not connected to both the first chamber of the first bus member (341) and the second chamber of the second bus member (342), so that the cavity (30b) is separated from both the medium inlet (3412) and the medium outlet (3422).

[0357] A first chamber connected to a flow path (30c) is installed in the first bus member (341), and a second chamber connected to a medium outlet (3422) is installed in the second bus member (342), so that the flow path (30c) can be connected to both the first chamber and the second chamber after penetrating both ends of the main body plate (331). By doing so, the flow path (30c) is connected to both the medium inlet (3412) and the medium outlet (3422), allowing fluid media to be injected simultaneously into multiple flow paths (30c) through the medium inlet (3412) and the medium outlet (3422) during use, thereby improving usage efficiency.

[0358] In some embodiments, with reference to FIG. 47 and FIG. 48, the cavity (30b) and the hollow cavity (30a) are both extended along the length direction of the main body plate (331) and are also arranged along the width direction (i.e., the third direction (z)) of the main body plate (331).

[0359] Here, a hollow cavity (30a) and a plurality of cavities (30b) are installed in the separator plate (33), the hollow cavity (30a) corresponds to a plurality of flow paths (30c), and both the cavity (30b) and the flow paths (30c) extend along the length direction of the main body plate (331), and also, the plurality of cavities (30b) and the plurality of flow paths (30c) are all arranged along the width direction of the main body plate (331). The arrangement of the plurality of cavities (30b) and the plurality of fluid passages (30c) can vary, for example, the cavities (30b) and fluid passages (30c) may be arranged alternately, and along the width direction of the main body plate (331), the plurality of cavities (30b) may be located on one side of the plurality of fluid passages (30c), and along the width direction of the main body plate (331), the plurality of cavities (30b) may be installed at an intermediate position of the main body plate (331) and fluid passages (30c) may be installed on both sides of the plurality of cavities (30b). For example, in FIG. 48, two flow paths (30c) are installed at the middle position of the main body plate (331) along the width direction of the main body plate (331), and three cavities (30b) are installed on each side of the two flow paths (30c), and one flow path (30c) is installed at both ends of the main body plate (331).

[0360] Both the cavity (30b) and the flow path (30c) extend along the length direction of the main body plate (331) and are also arranged along the width direction of the main body plate (331), making it convenient to process and manufacture the cavity (30b) and the flow path (30c), and also convenient to optimize the placement position of the flow path (30c), which is advantageous for improving the temperature control ability of the separator plate (33) for the battery (100).

[0361] In some embodiments, referring to FIGS. 48 and 49, a channel (30c) is installed at an intermediate position of the main body plate (331) along the width direction of the main body plate (331).

[0362] Here, a channel (30c) is installed at an intermediate position of the main body plate (331). If there is only one channel (30c), the channel (30c) is installed at an intermediate position of the main body plate (331). If there are multiple channels (30c), at least some of the multiple channels (30c) are located at an intermediate position of the main body plate (331) in the width direction of the main body plate (331). For example, in FIGS. 48 and 49, two channels (30c) are installed at an intermediate position of the main body plate (331) along the width direction of the main body plate (331). Of course, in other embodiments, one, three, or four channels (30c) may be installed at an intermediate position of the main body plate (331) along the width direction of the main body plate (331).

[0363] A flow path (30c) is installed at an intermediate position of the main body plate in the width direction of the main body plate (331), so that heat exchange can be performed at a location where heat inside the battery (100) is more concentrated, which is advantageous for improving the thermal management performance of the separator plate (33) for the battery (100).

[0364] In some embodiments, referring to FIG. 51, FIG. 51 is a cross-sectional view of the main body plate (331) of a separator plate (33) provided in another embodiment of the present application. A plurality of fluid passages (30c) and a plurality of cavities (30b) are installed in the separator plate (33), and along the width direction of the main body plate (331), the cavities (30b) and fluid passages (30c) are arranged alternately.

[0365] Here, the cavity (30b) and the flow path (30c) are arranged alternately, that is, the cavity (30b) and the flow path (30c) are arranged alternately in sequence along the width direction of the main body plate (331), that is, along the width direction of the main body plate (331), a cavity (30b) is installed between two adjacent flow paths (30c), and a flow path (30c) is installed between two adjacent cavities (30b).

[0366] Cavities (30b) and passages (30c) are arranged alternately along the width direction of the main body plate (331), that is, there are multiple cavities (30b) and passages (30c), and the cavities (30b) and passages (30c) are arranged alternately with each other, so that the passages (30c) are dispersed and arranged along the width direction of the main body plate (331), thereby effectively reducing the phenomenon of uneven heat exchange capacity of the separator plate (33) caused by the concentration of passages (30c), and furthermore, it is advantageous to improve the usage performance of the separator plate (33).

[0367] In some embodiments, referring to FIG. 49, along the thickness direction (i.e., the first direction (x)) of the main body plate (331), the main body plate (331) has two opposing side surfaces (3312), the area of ​​the side surfaces (3312) is S5, the total projected area on the side surfaces (3312) of the flow channel (30c) is S6, and S6 / S5 ≥ 0.2 is satisfied.

[0368] Here, the area of ​​the side surface (3312) is S5, and the total projected area on the side surface (3312) of the channel (30c) is S6, and S6 / S5≥0.2, that is, the total area occupied by multiple channels (30c) on the side (3312) of the main body plate (331) is 20% or more.

[0369] By making the area occupied by multiple flow paths (30c) on the side (3312) of the main body plate (331) 20% or more, the phenomenon where the heat exchange capacity is reduced due to the area occupied by the flow paths (30c) being too small can be reduced, and furthermore, the heat exchange performance of the separator plate (33) can be guaranteed.

[0370] In some embodiments, with reference to FIGS. 46 and 47, the hollow cavities (30a) of a plurality of separator plates (33) are connected in series with each other, that is, the media inlet (3412) of one separator plate (33) is connected to the media outlet (3422) of another separator plate (33), and of course, the flow paths (30c) of the plurality of separator plates (33) may be connected in parallel with each other, that is, the media inlets (3412) of the plurality of separator plates (33) are connected to each other and the media outlets (3422) of the plurality of separator plates (33) are connected to each other. A plurality of separator plates (33) are installed in the battery (100), which is advantageous for improving the thermal management capability of the separator plates (33) for the battery cell (20) in the battery (100), thereby reducing the safety risk of the battery (100) due to the rise in internal temperature.

[0371] In some embodiments, referring to FIGS. 46 and FIGS. 47, the media outlet (3422) of one separator plate (33) is in communication with the media inlet (3412) of another separator plate (33).

[0372] Here, the structure in which the media outlet (3422) of one separator plate (33) communicates with the media inlet (3412) of another separator plate (33) can be varied, and the media outlet (3422) of one separator plate (33) can be connected to the media inlet (3412) of another separator plate (33), and can be communicated through other components such as connecting conduits, thereby realizing a serial structure of multiple separator plates (33).

[0373] By connecting the media outlet (3422) of one of the multiple separator plates (33) with the media inlet (3412) of another separator plate (33), a serial structure of multiple separator plates (33) is realized, which is convenient for assembly and processing, and also convenient for injecting a fluid medium into the flow path (30c) of the multiple separator plates (33) during use.

[0374] In some embodiments, a plurality of channels (30c) are installed in the separator plate (33), and along the flow direction of the fluid medium within the channels (30c) of the plurality of separator plates (33), among two adjacent separator plates (33), the number of channels (30c) of the separator plate (33) located downstream is greater than the number of channels (30c) of the separator plate (33) located upstream.

[0375] Here, along the flow direction of the fluid medium within the flow path (30c) of the multiple separator plates (33), that is, along the direction in which the fluid medium passes through the flow path (30c) of the multiple separator plates (33), among two adjacent separator plates (33), the number of flow paths (30c) of the separator plate (33) located downstream is greater than the number of flow paths (30c) of the separator plate (33) located upstream, that is, in the flow direction of the fluid medium, among two adjacent separator plates (33), the separator plate (33) through which the fluid medium passes first is the separator plate (33) located upstream, and the separator plate (33) through which the fluid medium passes later is the separator plate (33) located downstream, that is, the fluid medium flows from the flow path (30c) of the separator plate (33) located upstream to the flow path (30c) of the separator plate (33) located downstream.

[0376] By making the number of flow paths (30c) of the separator plate (33) located downstream greater than the number of flow paths (30c) of the separator plate (33) located upstream, it is advantageous to improve the heat exchange capacity of the separator plate (33) located downstream, thereby ensuring a balance of the heat exchange capacities of the multiple separator plates (33), and thus improving the overall heat management capability, furthermore, it is possible to effectively mitigate the local temperature rise phenomenon inside the battery (100).

[0377] In some embodiments, the media inlets (3412) of a plurality of separator plates (33) are connected to each other, and the media outlets (3422) of a plurality of separator plates (33) are connected to each other.

[0378] Here, the media inlets (3412) of the plurality of separator plates (33) may be directly connected or may be connected through other members such as connecting conduits, and likewise, the media outlets (3422) of the plurality of separator plates (33) also implement a parallel structure of the plurality of separator plates (33) in this way.

[0379] By connecting the media inlets (3412) of multiple separator plates (33) to each other and connecting the media outlets (3422) of multiple separator plates (33) to each other, a parallel structure of multiple separator plates (33) is realized, thereby enabling the function of simultaneously injecting fluid media into the flow paths (30c) of multiple separator plates (33) on one hand, and effectively ensuring the balance of the heat exchange capacity of each separator plate (33) on the other, furthermore, the local temperature rise phenomenon inside the battery (100) can be effectively mitigated.

[0380] In some embodiments, as shown in FIG. 24, a separating member (335) is installed in the hollow cavity (30a) to separate the interior of the hollow cavity (30a) into at least two fluid channels (30c), which is convenient for controlling the distribution of the fluid medium inside the hollow cavity as needed, and thus convenient for reasonably controlling the temperature of the battery cell (20).

[0381] For example, a plurality of channels (30c) may be arranged sequentially along a third direction (z), each channel (30c) extends along a second direction (y), and the third direction is perpendicular to the second direction and parallel to the first wall (201).

[0382] Each channel (30c) may be independent of each other or may be connected to each other. A fluid medium may be contained in only some of the channels (30c) among the multiple channels (30c), or a fluid medium may be contained in all of the channels (30c). Accordingly, the separating member (335) separates the interior of the separator plate (33) to form multiple channels (30c), which is convenient for controlling the distribution of the fluid medium inside the separator plate (33) according to actual needs, and thus convenient for reasonably controlling the temperature of the battery cell (20).

[0383] Optionally, the separating member (335) is formed integrally with the separating plate (33), for example, the separating member (335) and the separating plate (33) are formed through an integral molding process such as pouring and extrusion. The separating member (335) and the separating plate (33) may be installed as a powder and then connected to the inner wall of the separating plate through methods such as welding, bonding, or locking.

[0384] Of course, only one flow path (30c) may be formed in the hollow cavity (30a).

[0385] In some embodiments, the separator (33) includes a main body plate (331) having a hollow cavity (30a) installed inside, the hollow cavity (30a) may have one or more flow paths (30c), and the insulating layer (32) includes a first insulating layer (32a), at least a portion of the first insulating layer (32a) is installed between the main body plate (331) and the battery cell (20).

[0386] Additionally, referring to FIGS. 20 and 21, the separator (33) further comprises a bus pipe (332) including a bus chamber (332a) (shown in FIGS. 26 and 28), the bus chamber (332a) is in communication with a plurality of flow paths (30c), and the insulating layer (32) comprises a second insulating layer (32b), at least a portion of the second insulating layer (32b) is installed between the bus pipe (332) and the battery cell (20) to insulate and isolate the battery cell (20) and the bus pipe (332).

[0387] "The second insulating layer (32b) covers at least a portion of the outer surface of the bus pipe (332)" can be understood as meaning that a portion of the second insulating layer (32b) covers at least a portion of the outer surface of the bus pipe (332) to insulate and isolate the battery cell (20) from the bus pipe (332).

[0388] Here, the two bus pipes (332) at both ends of the separator plate (33) may each be a first bus member (341) and a second bus member (342).

[0389] Only a portion of the second insulating layer (32b) may cover at least a portion of the outer surface of the first bus member (341), or only a portion of the second insulating layer (32b) may cover at least a portion of the outer surface of the second bus member (342), or a portion of the second insulating layer (32b) may cover at least a portion of the outer surface of the first bus member (341) and a portion of the second insulating layer (32b) may cover at least a portion of the outer surface of the second bus member (342).

[0390] When a portion of the second insulating layer (32b) covers at least a portion of the surface of the first bus member (341), the portion of the second insulating layer (32b) may cover only a portion of the outer surface of the first bus member (341), for example, the portion of the second insulating layer (32b) may cover only the outer circumference of the first bus member (341), and two cross-sections along the third direction (z) of the first bus member (341) may not be covered by the insulating layer (32), and compared to the case where the insulating layer (32) covers only the main body plate (331), the creepage distance between the battery cell (20) and the portion of the first bus member (341) not covered by the insulating layer (32) may be increased, thereby reducing the risk of a short circuit of the battery (100); or a portion of the insulating layer (32) may cover the entire outer surface of the first bus member (341).

[0391] In some other embodiments, the insulating layer (32) may not cover the outer surface of the first bus member (341). The first bus member (341) extends along the third direction (z), and the second bus member (342) extends along the third direction (z).

[0392] When a portion of the second insulating layer (32b) covers at least a portion of the surface of the second bus member (342), the portion of the insulating layer (32) may cover only a portion of the outer surface of the second bus member (342), for example, the portion of the insulating layer (32) may cover only the outer circumference of the second bus member (342), and two cross-sections along the third direction (z) of the second bus member (342) may not be covered by the second insulating layer (32b), and compared to the case where the insulating layer (32) covers only the main body plate (331), the creepage distance between the battery cell (20) and the portion of the second bus member (342) not covered by the insulating layer (32) may be increased, thereby reducing the risk of a short circuit of the battery (100); or the portion of the second insulating layer (32b) may cover the entire outer surface of the second bus member (342).

[0393] In some other embodiments, as shown in FIG. 27 and FIG. 29, the insulating layer (32) may not cover the outer surface of the second bus member (342).

[0394] Accordingly, the second insulating layer (32b) covers at least a portion of the outer surface of the bus pipe (332), and the second insulating layer (32b) may completely cover the outer surface of the bus pipe (332) or cover only one side surface facing the battery cell (20) from the bus pipe (332), and the second insulating layer (32b) is used to insulate and isolate the bus pipe (332) and the battery cell (20), thereby reducing the risk of battery short circuit and improving the safety performance of the battery.

[0395] In the present embodiment, the bus pipe (332) may be located on one side of the battery cell (20), and since a fluid medium is similarly contained in the bus pipe (332), the bus pipe (332) may similarly be used to heat exchange the battery cell (20), and the second insulating layer (32b) covers at least a portion of the outer surface of the bus pipe (332), and the second insulating layer (32b) may completely cover the outer surface of the bus pipe (332) or may cover only one side surface facing the battery cell (20) from the bus pipe (332), and the second insulating layer (32b) is used to insulate and isolate the bus pipe (332) and the battery cell (20), thereby reducing the risk of battery short circuit and improving the safety performance of the battery.

[0396] Referring to FIGS. 20, 21, 25 and 26, in this embodiment, two bus pipes (332) are each a first bus member (341) and a second bus member (342); a media inlet (3412) is installed in the first bus member (341), and a first bus chamber (3411) communicating with the media inlet (3412) is formed inside the first bus member (341); a media outlet (3422) is installed in the second bus member (342), and a second bus chamber (3421) communicating with the media outlet (3422) is formed inside the second bus member (342); and both the first bus chamber (3411) and the second bus chamber (3421) are communicating with each flow path (30c).

[0397] A media inlet (3412) is installed in the first bus member (341), and a media outlet (3422) is installed in the second bus member (342). The first bus chamber (3411) of the first bus member (341) and the second bus chamber (3421) of the second bus member (342) are both connected to each flow path (30c). A fluid medium can enter the first bus chamber (3411) from the media inlet (3412), and then be distributed to each flow path (30c) through the first bus chamber (3411). The fluid medium of each flow path (30c) flows to the second bus member (342) along the second direction (Y), concentrates in the second bus chamber (3421), and can be discharged from the media outlet (3422).

[0398] In some other embodiments, the bus pipe (332) may not be installed in the separator (33), and a media inlet (3412) and a media outlet (3422) are installed correspondingly in each channel (30c), and the fluid medium enters the channel (30c) from its respective media inlet (3412) and is discharged from its respective channel (30c). This installation method is convenient for independently controlling the total amount and flow rate of the fluid medium within each channel (30c).

[0399] In this embodiment, the installation of the first bus member (341) is advantageous for distributing the fluid medium to each flow path (30c) and for uniformity of temperature control of the battery cell (20), and the installation of the second bus member (342) is advantageous for rapid discharge of the fluid medium, thereby improving heat exchange efficiency.

[0400] In some embodiments, as shown in FIGS. 25 and 26, the thickness of the second insulating layer (32b) is h3, the wall thickness of the main body plate (331) is h2, and h3 / h2 ≥ 0.00625, which increases safety as the creepage distance between the bus pipe (332) and the battery cell (20) increases, thereby reducing the risk of electrical contact between the two in various usage scenarios.

[0401] h3 / h2 can be 0.01, 0.015, 0.1, 0.15, 0.2, 0.25, 0.3, 0.35, 0.4, etc.

[0402] In some embodiments, the insulating layer (32) has an equal thickness structure, that is, the thickness h1 of the first insulating layer (30a) and the thickness h3 of the second insulating layer (30b) are the same, and h1=h3. In other embodiments, the thickness of the first insulating layer and the thickness of the second insulating layer are not the same.

[0403] In some embodiments, with reference to FIGS. 20, 21, 25 to 29, a first guide tube (343) is installed at a medium inlet (3412) and a second guide tube (344) is installed at a medium outlet (3422); the insulating layer (32) further comprises a third insulating layer (32c); a portion of the third insulating layer (32c) covers the outer surface of the first conductive tube (343) to insulate and isolate the battery cell (20) from the first guide tube (343); and / or, a portion of the third insulating layer (32c) covers the outer surface of the second conductive tube (344) to insulate and isolate the battery cell (20) from the second guide tube (344).

[0404] A first guide tube (343) may be installed only at the media inlet (3412), or a second guide tube (344) may be installed only at the media outlet (3422), or a first guide tube (343) may be installed at the media inlet (3412) and a second guide tube (344) may also be installed at the media outlet (3422). FIGS. 20 and 21 illustrate a case where a first guide tube (343) is installed at the media inlet (3412) and a second guide tube (344) is installed at the media outlet (3422).

[0405] As illustrated in FIGS. 20, 21, and FIGS. 25 to 29, when a portion of the insulating layer (32) covers the outer surface of the first induction tube (343), the portion of the insulating layer (32) may cover only a portion of the outer surface of the first induction tube (343). For example, compared to the case where the portion of the insulating layer (32) covers only the outer circumference of the first induction tube (343) and two cross-sections along the axial direction of the first induction tube (343) are not covered by the insulating layer (32), and the insulating layer (32) covers only the main body plate (331), the first bus member (341), and the second bus member (342), the creepage distance between the battery cell (20) and the portion of the first induction tube (343) not covered by the insulating layer (32) can be increased, thereby reducing the risk of a short circuit of the battery (100); Alternatively, a portion of the insulating layer (32) covers the entire outer surface of the first induction tube (343). In some other embodiments, as illustrated in FIG. 25, the insulating layer (32) may not cover the outer surface of the first induction tube (343).

[0406] As illustrated in FIGS. 20, 21, and FIGS. 25 to 29, when a portion of the insulating layer (32) covers the outer surface of the second induction tube (344), the portion of the insulating layer (32) may cover only a portion of the outer surface of the second induction tube (344). For example, compared to the case where the portion of the insulating layer (32) covers only the outer circumference of the second induction tube (344) and two cross-sections along the axial direction of the second induction tube (344) are not covered by the insulating layer (32), and the insulating layer (32) covers only the main body plate (331), the first bus member (341), and the second bus member (342), the creepage distance between the battery cell (20) and the portion of the second induction tube (344) not covered by the insulating layer (32) can be increased, thereby reducing the risk of a short circuit of the battery (100); Alternatively, a portion of the insulating layer (32) covers the entire outer surface of the second induction tube (344).

[0407] In some other embodiments, the insulating layer (32) may not cover the outer surface of the second induction tube (344).

[0408] As shown in FIGS. 20, 21, 25 to 29, the first guide tube (343) and the second guide tube (344) are arranged coaxially, and the axial direction of the first guide tube (343) and the axial direction of the second guide tube (344) are both parallel to the second direction (y).

[0409] As illustrated in FIGS. 20, 21, 25 to 29, one end of the first guide tube (343) is inserted into the medium inlet (3412) of the first bus member (341) and welded to the first bus member (341). One end of the second guide tube (344) is inserted into the medium outlet (3422) of the second bus member (342) and welded to the second bus member (342).

[0410] A first limit portion (361) is installed on the outer surface of the first guide tube (343), and the first limit portion (361) protrudes from the outer surface of the first guide tube (343) along the radial direction of the first guide tube (343), and the first limit portion (361) is used to limit the insertion distance of the first guide tube (343) into the interior of the first bus member (341). After the first guide tube (343) is inserted into the medium inlet (3412) of the first bus member (341), the first limit portion (361) comes into contact with the outer wall of the first bus member (341). The first guide tube (343) can be welded to the first bus member (341) through the first limit portion (361).

[0411] A second limit portion (371) is installed on the outer surface of the second guide tube (344), and the second limit portion (371) protrudes from the outer surface of the second guide tube (344) along the radial direction of the second guide tube (344), and the second limit portion (371) is used to limit the insertion distance of the second guide tube (344) into the interior of the second bus member (342). After the second guide tube (344) is inserted into the medium outlet of the second bus member (342), the second limit portion (371) comes into contact with the outer wall of the second bus member (342). The second guide tube (344) can be welded to the second bus member (342) through the second limit portion (371).

[0412] In some other embodiments, the first guide tube (343) may not be installed at the media inlet (3412), and the second guide tube (344) may not be installed at the media outlet (3422).

[0413] The installation of the first guide tube (343) is convenient for the fluid medium to enter the first bus chamber (3411) of the first bus member (341), and the installation of the second guide tube (344) is convenient for the fluid medium to be discharged from the second bus chamber (3421) of the second bus member (342). A portion of the insulating layer (32) can cover the outer surface of the first guide tube (343) to insulate and isolate the first guide tube (343) from the battery cell (20), and / or a portion of the insulating layer (32) can cover the outer surface of the second guide tube (344) to insulate and isolate the second guide tube (344) from the battery cell (20), thereby reducing the risk of a short circuit of the battery (100) and improving the safety performance of the battery (100).

[0414] In some embodiments, along the second direction (y), the first bus member (341) and the second bus member (342) are each located on both sides of the battery cell (20), and the third direction (z) is perpendicular to the second direction (y).

[0415] The first bus member (341) and the second bus member (342) are each positioned on both sides of the battery cell (20), so that the arrangement direction of the first bus member (341) and the second bus member (342) is offset from the tab protrusion direction of the battery cell (20), thereby ensuring that both the first bus member (341) and the second bus member (342) are installed offset from the electrical energy output electrode of the battery cell (20), thereby avoiding the first bus member (341) and the second bus member (342) affecting the charging and discharging of the battery cell (20), or avoiding the first bus member (341) and the second bus member (342) affecting the series, parallel, or mixed connection between each battery cell (20).

[0416] As illustrated in FIG. 20, the main body plate (331) extends along the second direction (y) to both ends of the battery cell (20). The first bus member (341) and the second bus member (342) are each connected to both ends of the main body plate (331) along the second direction (y). A plurality of battery cells (20) can be overlapped along the second direction (y) without interfering with the first bus member (341) and the second bus member (342), allowing the plurality of battery cells (20) to be arranged more densely, which is advantageous for reducing the volume of the battery (100).

[0417] In some embodiments, the battery cell (20) includes a battery box (21) and an insulating layer (not shown in the drawing) connected to the outer surface of the battery box (21), said insulating layer is used to insulate and isolate the heat-conducting member (3a) and the battery box (21).

[0418] The insulating layer may be a coating on the outer surface of the battery box (21) or an insulating coating layer applied to the outer surface of the battery box (21). The insulating layer is connected to the surface of the battery box (21) of the battery cell (20), and the insulating layer of the battery cell (20) and the insulating layer (32) of the heat-conducting member (3a) jointly insulate the battery cell (20) and the heat-conducting member (3a), thereby further reducing the risk of a short circuit of the battery (100).

[0419] In some embodiments, as illustrated in FIGS. 52 to 64, the heat-conducting member (3a) comprises a first heat-conducting plate (3331), a second heat-conducting plate (3332), and a separating member (335) installed in a stacked manner, wherein the separating member (335) is installed between the first heat-conducting plate (3331) and the second heat-conducting plate (3332), and the first heat-conducting plate (3331) and the separating member (335) jointly define a first flow path (34), and the second heat-conducting plate (3332) and the separating member (335) jointly define a second flow path (35).

[0420] When a heat-conducting member (3a) is installed between two adjacent battery cells (20), the first flow path (34) and the second flow path (35) correspond to the two adjacent battery cells (20), and the fluid medium in the first flow path (34) and the fluid medium in the second flow path (35) exchange heat with the corresponding two battery cells (20), thereby reducing the temperature difference between the two adjacent battery cells (20). The expansion of one battery cell (20) does not reduce the dimensions of the flow path corresponding to the other battery cell (20) by compression, or has a very small effect on the dimensions of the flow path corresponding to the other battery cell (20), thereby ensuring the heat exchange effect of the flow path corresponding to the other battery cell (20), and thereby ensuring the safety performance of the battery (100) using the heat-conducting member (3a).

[0421] Additionally, the first Euro (34) and the second Euro (35) correspond to two adjacent battery cells (20) and can independently withstand deformation caused by the expansion of each corresponding battery cell (20), so that the expansion of one battery cell (20) has very little interference with the expansion of another battery cell (20) or does not affect the expansion of the other battery cell (20), which is advantageous for the expansion release of two adjacent battery cells (20) and reduces the pre-pressure release or severe thermal runaway accident of two adjacent battery cells (20) caused by mutual interference of the expansion of two adjacent battery cells (20), thereby improving the safety performance of the battery (100).

[0422] Both the first channel (34) and the second channel (35) are used to accommodate a fluid medium, and the fluid medium can flow within the first channel (34) and the second channel (35). Here, the first channel (34) and the second channel (35) may be independent of each other, and the fluid medium within the first channel (34) does not enter the second channel (35), and the fluid medium in the second channel (35) does not enter the first channel (34).

[0423] For example, along the extension direction of the first flow path (34), the first flow path (34) has a first inlet and a first outlet located at both ends of the first flow path (34), and a fluid medium enters the first flow path (34) from the first inlet and is discharged outside the first flow path (34) from the first outlet; along the extension direction of the second flow path (35), the second flow path (35) has a second inlet and a second outlet located at both ends of the second flow path (35), and a fluid medium enters the second flow path (35) from the second inlet and is discharged outside the second flow path (35) from the second outlet.

[0424] The first flow path (34) and the second flow path (35) can be connected to each other, and the fluid medium in the first flow path (34) can enter the second flow path (35), or the fluid medium in the second flow path (35) can enter the first flow path (34).

[0425] In an embodiment where there is only one battery cell (20), a heat-conducting member (3a) is installed on one side of the battery cell (20) and is located between the battery cell (20) and the inner wall of the box body (10). The first flow path (34) is installed closer to the battery cell (20) than the second flow path (35), and the second flow path (35) is installed closer to the inner wall of the box body (10) than the first flow path (34).

[0426] In an embodiment in which there are multiple battery cells (20), the multiple battery cells (20) are stacked along one direction (the stacking direction of the first heat conduction plate (3331), the second heat conduction plate (3332) and the separating member (335), the first direction (x)).

[0427] As illustrated in FIGS. 53 and 54, a heat-conducting member (3a) may be installed between two adjacent battery cells (20). For convenience of explanation, the two adjacent battery cells (20) are defined as the first battery cell (21) and the second battery cell (22), respectively, and the arrangement direction of the first flow path (34) and the second flow path (35) is the same as the stacking direction of the first battery cell (21) and the second battery cell (22), and the arrangement direction of the first flow path (34) and the second flow path (35) is the same as the stacking direction of the first heat-conducting plate (3331), the second heat-conducting plate (3332), and the separating member (335). A first flow path (34) is installed corresponding to a first battery cell (21), and a first heat conduction plate (3331) is used to heat conductionally connect to the first battery cell (21), and a fluid medium within the first flow path (34) is used to heat exchange with the first battery cell (21) to control the temperature of the first battery cell (21); a second flow path (35) is installed corresponding to a second battery cell (22), and a second heat conduction plate (3321) is used to heat conductionally connect to the second battery cell (22), and a fluid medium within the second flow path (35) is used to heat exchange with the second battery cell (22) to control the temperature of the second battery cell (22);

[0428] A thermally conductive connection means that heat can be transferred between the two, for example, if the first thermally conductive plate (3331) and the first battery cell (21) are thermally connected, heat can be transferred between the first battery cell (21) and the first thermally conductive plate (3331), and heat can be transferred between the fluid medium in the first flow path (34) and the first battery cell (21) through the first thermally conductive plate (3331), thereby enabling heat exchange between the fluid medium in the first flow path (34) and the first battery cell (21). When the second heat conduction plate (3332) and the second battery cell (22) are thermally connected, heat can be transferred between the second battery cell (22) and the second heat conduction plate (3332), and heat can be transferred between the fluid medium in the second flow path (35) and the second battery cell (22) through the second heat conduction plate (3332), thereby enabling heat exchange between the fluid medium in the second flow path (35) and the second battery cell (22).

[0429] As illustrated in FIGS. 53 and 54, the fluid medium in the first flow path (34) and the fluid medium in the second flow path (35) can each exchange heat with the corresponding two battery cells (20) to reduce the temperature difference between the two adjacent battery cells (20), and the expansion of one battery cell (20) does not reduce the dimensions of the flow path corresponding to the other battery cell (20) by compression, or has a very small effect on the dimensions of the flow path corresponding to the other battery cell (20), thereby ensuring the heat exchange effect of the flow path corresponding to the other battery cell (20), and thereby ensuring the safety performance of the battery (100) using the heat-conducting member (3a). For example, the expansion of the battery cell (20) (first battery cell (21)) corresponding to the first flow path (34) reduces the dimensions of the first flow path (34) in the stacking direction (i.e., the first direction) of the first heat-conducting member, the second heat-conducting member, and the separating member, but the first battery cell (21) does not affect the dimensions of the second flow path (35) in the stacking direction of the first heat-conducting plate (3331), the second heat-conducting plate (3332), and the separating member (335), or has very little effect on the dimensions of the second flow path (35) in the stacking direction of the first heat-conducting plate (3331), the second heat-conducting plate (3332), and the separating member (335), thereby ensuring the heat exchange capacity of the battery cell (20) (second battery cell (22)) corresponding to the second flow path (35).Likewise, the expansion of the battery cell (20) (second battery cell (22)) corresponding to the second flow path (35) reduces the dimensions of the second flow path (35) in the stacking direction of the first heat conduction plate (3331), the second heat conduction plate (3332), and the separating member (335), but the second battery cell (22) does not affect the dimensions of the first flow path (34) in the stacking direction of the first heat conduction plate (3331), the second heat conduction plate (3332), and the separating member (335), or has very little effect on the dimensions of the first flow path (34) in the stacking direction of the first heat conduction plate (3331), the second heat conduction plate (3332), and the separating member (335), thereby ensuring the heat exchange capacity of the battery cell (20) (second battery cell (22)) corresponding to the first flow path (34).

[0430] Since the first Euro (34) and the second Euro (35) correspond to two adjacent battery cells (20), they can independently withstand deformation caused by the expansion of each corresponding battery cell (20), and thus, the expansion of one battery cell (20) has very little interference with the expansion of another battery cell (20) or does not affect the expansion of the other battery cell (20), which is advantageous for the expansion release of two adjacent battery cells (20) and reduces the pre-pressure release or severe thermal runaway accident of two adjacent battery cells (20) caused by mutual interference of the expansion of two adjacent battery cells (20), thereby further improving the safety performance of the battery (100). In addition, the fluid medium in the first Euro (34) and the fluid medium in the second Euro (35) can each exchange heat with the corresponding two battery cells (20) to reduce the temperature difference between the two adjacent battery cells (20), thereby ensuring the safety performance of the battery (100) using the heat-conducting member (3a).

[0431] The number of first euros (34) may be one or more, and the number of second euros (35) may be one or more. In some embodiments, the first euros (34) are multiple, and / or the second euros (35) are multiple.

[0432] The number of first flow paths (34) may be multiple and the number of second flow paths (35) may be one; the number of first flow paths (34) may be one and the number of second flow paths (35) may be multiple; or the number of first flow paths (34) may be multiple and the number of second flow paths (35) may also be multiple. In an embodiment where the first flow paths (34) are multiple, that is, the first heat conduction plate (3331) and the separating member (335) jointly define the multiple first flow paths (34), and the multiple first flow paths (34) are arranged sequentially along a third direction (z), and each first flow path (34) extends along a second direction (y). The third direction (z) is perpendicular to the second direction (y). In an embodiment where the second flow path (35) is a plurality of individual, that is, the second heat conduction plate (3332) and the separating member (335) jointly define the plurality of second flow paths (35), and the plurality of second flow paths (35) are arranged sequentially along the third direction (z), and each second flow path (35) extends along the second direction (y).

[0433] In some other embodiments, the arrangement direction of the plurality of first channels (34) and the arrangement direction of the plurality of second channels (35) may be different. The extension direction of the first channels (34) and the extension direction of the second channels (35) may be different. Of course, the extension direction of the plurality of first channels (34) may be different, and the extension direction of the plurality of second channels (35) may be different.

[0434] The first flow path (34) is a plurality and / or the second flow path (35) is a plurality, which allows the heat conduction member (3a) to accommodate more fluid medium and to make the distribution of the fluid medium more uniform, which is advantageous for improving heat exchange efficiency and heat exchange uniformity and reducing the temperature difference between different regions of the battery cell (20).

[0435] The molding method of the first Euro (34) varies, and in some embodiments, as shown in FIGS. 55 to 59, a first groove (3351) is installed in the separating member (335), and the first groove (3351) forms part of the first Euro (34).

[0436] "The first groove (3351) forms part of the first flow path (34)" means that the groove wall of the first groove (3351) is part of the wall of the first flow path (34). The first groove (3351) has various forms, for example, as shown in FIG. 56, along the stacking direction of the first heat conduction plate (3331), the second heat conduction plate (3332), and the separating member, the separating member (335) has a first surface (3352) facing the first heat conduction plate (3331) and a second surface (3353) facing the second heat conduction plate (3332), the first surface (3352) and the second surface (3353) are arranged opposite each other, and the first groove (3351) is installed on the first surface (3352) and is recessed in a direction adjacent to the second surface (3353). Also, for example, as shown in FIG. 58, a first groove (3351) is installed on a first surface (3352), and the first groove (3351) is recessed in a direction close to the second surface (3353) from the first surface (3352), and a first projection (3354) is formed at a position corresponding to the first groove (3351) on the second surface (3353).

[0437] The first groove (3351) penetrates at least one end of the separating member (335) along the second direction (y). In this embodiment, the first groove (3351) penetrates both ends of the separating member (335) along the second direction (y), and a fluid medium may be introduced from one end of the first flow path (34) along the second direction (y) and discharged from the other end of the first flow path (34) along the second direction (y).

[0438] A first groove (3351) installed in a separating member (335) forms part of a first flow path (34), and if the cross-sectional area of ​​the first flow path (34) is sufficient, the dimensions of the heat management member (30) according to the stacking direction of the first heat conduction plate (3331), the second heat conduction plate (3332), and the separating member (335) are reduced.

[0439] As illustrated in FIGS. 55 to 58, in some embodiments, the first heat conduction plate (3331) blocks the groove opening toward the first heat conduction plate (3331) from the first groove (3351) to form the first flow path (34).

[0440] In some embodiments, one side of the first heat conduction plate (3331) facing the separation member (335) is in contact with the first surface (3352), so that the first heat conduction plate (3331) blocks the groove opening facing the first heat conduction plate (3331) from the first groove (3351), thereby forming the first flow path (34), that is, the first heat conduction plate (3331) forms another part of the first flow path (34). Accordingly, in the embodiment where one side of the first heat conduction plate (3331) facing the separation member (335) is in contact with the first surface (3352), the groove wall of the first groove (3351) is part of the wall of the first flow path (34), and the surface facing the separation member (335) from the first heat conduction plate (3331) is part of the wall of the first flow path (34). One side of the first heat conduction plate (3331) facing the separation member (335) comes into contact with the first surface (3352), which means that the surface facing the separation member (335) from the first heat conduction plate (3331) comes into contact with the first surface (3352) but there is no connection, or the surface facing the separation member (335) from the first heat conduction plate (3331) may come into contact with the first surface (3352) such as by welding and be connected.

[0441] In some other embodiments, the first groove (3351) is not installed in the first surface (3352), and there is a gap between the first surface (3352) and the side facing the separation member (335) from the first heat conduction plate (3331), and the first groove (3351), the first surface (3352), and the first heat conduction plate (3331) jointly define the first flow path (34).

[0442] The first heat conduction plate (3331) blocks the groove opening toward the first heat conduction plate (3331) from the first groove (3351) to form the first flow path (34), thereby allowing the first heat conduction plate (3331) and the separating member (335) to be installed more densely in the stacking direction of the first heat conduction plate (3331), the second heat conduction plate (3332), and the separating member (335), thereby reducing the dimensions of the heat management member (30) along the stacking direction of the first heat conduction plate (3331), the second heat conduction plate (3332), and the separating member (335).

[0443] In some other embodiments, the first groove (3351) is not installed on the first surface (3352) of the separating member (335), and there is a gap between the first surface (3352) and one side facing the separating member (335) from the first heat conduction plate (3331), and the first surface (3352) forms part of the wall of the first flow path (34), and the surface facing the separating member (335) from the first heat conduction plate (3331) forms another part of the wall of the first flow path (34).

[0444] The molding method of the second Euro (35) varies, and as shown in FIGS. 55 to 58, in some embodiments, a second groove (3355) is installed in the separating member (335), and the second groove (3355) forms part of the second Euro (35).

[0445] “The second groove (3355) forms part of the second flow path (35)” means that the groove wall of the second groove (3355) is part of the wall of the second flow path (35). The second groove (3355) is of various forms, for example, as shown in FIG. 55, along the stacking direction of the first heat conduction plate (3331), the second heat conduction plate (3332), and the separating member (335), the second groove (3355) is installed on the second surface (3353) and is recessed in a direction close to the first surface (3352). Also, for example, as shown in FIG. 57, a second groove (3355) is installed on a second surface (3353), and the second groove (3355) is recessed in a direction close to the first surface (3352) from the second surface (3353), and a second projection (3356) is formed at a position corresponding to the second groove (3355) on the first surface (3352).

[0446] The second groove (3355) penetrates at least one end of the separating member (335) along the second direction (y). In this embodiment, the second groove (3355) penetrates both ends of the separating member (335) along the second direction (y), and a fluid medium may be introduced from one end of the second flow path (35) along the second direction (y) and exit from the other end of the second flow path (35) along the second direction (y).

[0447] A second groove (3355) installed in the separation member (335) forms part of the second flow path (35), and if the cross-sectional area of ​​the second flow path (35) is sufficient, the dimensions of the thermal management member (30) according to the stacking direction of the first heat conduction plate (3331), the second heat conduction plate (3332), and the separation member (335) are reduced.

[0448] As illustrated in FIGS. 55 to 58, in some embodiments, the second heat conduction plate (3332) blocks the groove opening toward the second heat conduction plate (3332) from the second groove (3355) to form the second flow path (35).

[0449] In some embodiments, one side of the second heat conduction plate (3332) facing the separation member (335) is in contact with the second surface (3353), so that the second heat conduction plate (3332) blocks the groove opening facing the second heat conduction plate (3332) from the second groove (3355), thereby forming a second flow path (35), that is, the second heat conduction plate (3332) forms another part of the first flow path (34). Accordingly, in an embodiment where one side of the second heat conduction plate (3332) facing the separation member (335) is in contact with the second surface (3353), the groove wall of the second groove (3355) is part of the wall of the second flow path (35), and the surface facing the separation member (335) from the second heat conduction plate (3332) is part of the wall of the second flow path (35). One side of the second heat conduction plate (3332) facing the separation member (335) comes into contact with the second surface (3353), which means that the surface facing the separation member (335) of the second heat conduction plate (3332) comes into contact with the second surface (3353) but there is no connection, or the surface facing the separation member (335) of the second heat conduction plate (3332) can come into contact with the second surface (3353) such as by welding and be connected.

[0450] In some other embodiments, the second groove (3355) is not installed in the second surface (3353), and there is a gap between the second surface (3353) and one side of the second heat conduction plate (3332) toward the separation member (335), and the second groove (3355), the second surface (3353), and the second heat conduction plate (3332) jointly define the second flow path (35).

[0451] The second heat conduction plate (3332) blocks the groove opening toward the second heat conduction plate (3332) from the second groove (3355) to form a second flow path (35), thereby allowing the second heat conduction plate (3332) and the separating member (335) to be installed more densely in the stacking direction of the first heat conduction plate (3331), the second heat conduction plate (3332), and the separating member, thereby reducing the dimensions of the heat conduction member (3a) along the stacking direction of the first heat conduction plate (3331), the second heat conduction plate (3332), and the separating member (335).

[0452] Referring further to FIGS. 55 to 58, in an embodiment in which the first flow path (34) is a plurality, the first groove (3351) is a plurality, and the plurality of first grooves (3351) are arranged along a third direction (z), and the third direction (z) is perpendicular to the stacking direction of the first heat conduction plate (3331), the second heat conduction plate (3332), and the separating member (335). The first heat conduction plate (3331) blocks the groove openings toward the first heat conduction plate (3331) from the plurality of first grooves (3351) to form the plurality of first flow paths (34).

[0453] In an embodiment in which the second flow path (35) is multiple, the second groove (3355) is multiple, and the multiple second grooves (3355) are arranged along a third direction (z), and the third direction (z) is perpendicular to the stacking direction of the first heat conduction plate (3331), the second heat conduction plate (3332), and the separating member (335). The second heat conduction plate (3332) blocks the groove openings toward the second heat conduction plate (3332) from the multiple second grooves (3355) to form multiple second flow paths (35).

[0454] Here, the separating member (335) may have a plurality of first grooves (3351) installed only on the first surface (3352) and one second groove (3355) installed on the second surface (3353) or not installed; or the separating member (335) may have a plurality of second grooves (3355) installed only on the second surface (3353) and one first groove (3351) installed on the first surface (3352) or not installed; or the separating member (335) may have a plurality of first grooves (3351) installed on the first surface (3352) and a plurality of second grooves (3355) installed on the second surface (3353).

[0455] The first groove (3351) may be multiple and may form multiple first flow paths (34); and / or the second groove (3355) may be multiple and may form multiple second flow paths (35), which allows the heat-conducting member (3a) to accommodate more fluid medium and to make the distribution of the fluid medium more uniform, thereby improving heat exchange efficiency and heat exchange uniformity and is advantageous for reducing the temperature difference between different regions of the battery cell (20).

[0456] Referring to FIGS. 55 to 58, the first groove (3351) and the second groove (3355) are alternately arranged along the third direction (z).

[0457] "The first groove (3351) and the second groove (3355) are alternately arranged along the third direction (z)" means that, along the stacking direction of the first heat conduction plate (3331), the second heat conduction plate (3332), and the separating member (335), at least a portion along the third direction (z) in the projection of the first surface (3352) of each second groove (3355) is located between two adjacent first grooves (3351); and / or, along the stacking direction of the first heat conduction plate (3331), the second heat conduction plate (3332), and the separating member (335), at least a portion along the third direction (z) in the projection of the second surface (3353) of each first groove (3351) is located between two adjacent second grooves (3355), thereby alternately arranging the first flow path (34) and the second flow path (35) in the third direction (z).

[0458] FIGS. 55 and 56 illustrate a case where, along the stacking direction of the first heat conduction plate (3331), the second heat conduction plate (3332), and the separating member, the projection on the first surface (3352) of each second groove (3355) is entirely located between two adjacent first grooves (3351). FIGS. 57 and 58 illustrate a case where, along the stacking direction of the first heat conduction plate (3331), the second heat conduction plate (3332), and the separating member, a portion of the projection along the third direction (z) of the first surface (3352) of each second groove (3355) is located between two adjacent first grooves (3351), and another portion of the projection along the third direction (z) of the first surface (3352) of each second groove (3355) overlaps with the first groove (3351).

[0459] The first groove (3351) and the second groove (3355) are alternately arranged along the third direction (z), so that the first flow path (34) and the second flow path (35) are alternately arranged along the third direction (z), and when the thermal management member (30) is located between two adjacent battery cells (20), the battery cell (20) corresponding to the first flow path (34) has a more uniform temperature fraction along the third direction (z), and the battery cell (20) corresponding to the second flow path (35) has a more uniform temperature fraction along the third direction (z).

[0460] Referring to FIGS. 57 to 59, in some embodiments, the separating member (335) is a corrugated plate, and the structure is simple and convenient to manufacture.

[0461] In the present embodiment, the first groove (3351) is installed on the first surface (3352), the first groove (3351) is recessed in a direction close to the second surface (3353) from the first surface (3352), and also forms a first projection (3354) at a position on the second surface (3353) corresponding to the first groove (3351); A second groove (3355) is installed on a second surface (3353), and the second groove (3355) is recessed in a direction close to the first surface (3352) from the second surface (3353), and a second protrusion (3356) is formed at a position on the first surface (3352) corresponding to the second groove (3355), and the first groove (3351) and the second groove (3355) are alternately arranged along a third direction (z), and the first protrusion (3354) and the second protrusion (3356) are alternately arranged along a third direction (z) to form a wave-shaped plate.

[0462] In some other embodiments, the separating member (335) may be a member of a different structural form, as shown in FIG. 55 and FIG. 56.

[0463] As illustrated in FIG. 60, the formation of the first flow path (34) may be formed in a different form, for example, in some other embodiments, the separating member (335) includes a main body part (3357) and a first separating part (3358), and the first separating part (3358) is connected to the main body part (3357) and the first heat conduction plate (3331), respectively, along both ends of the first direction (x), and the main body part (3357), the first separating part (3358), and the first heat conduction plate (3331) jointly define the first flow path (34).

[0464] The main body (3357) and the first separation part (3358) are both flat plate structures, and a first space is defined between the main body (3357) and the first heat conduction plate (3331). The number of first separation parts (3358) may be one or more, and in an embodiment where there are multiple first separation parts (3358), multiple first separation parts (3358) are spaced apart along a first direction (x), and the multiple first separation parts (3358) separate the first space into multiple first sub-spaces, so that the main body (3357), the first heat conduction plate (3331), and the multiple first separation parts (3358) together define multiple first flow paths (34). The main body (3357) and the first separating part (3358) can be formed integrally, for example, the main body (3357) and the first separating part (3358) are formed through an integral molding process such as pouring or extrusion. The main body (3357) and the first separating part (3358) are installed as powder and then connected as a whole through welding, screw connection, etc.

[0465] The main body (3357), the first separator (3358), and the first heat conduction plate (3331) jointly define a plurality of first flow paths (34) so ​​that the heat conduction member (3a) can accommodate more fluid medium and make the distribution of the fluid medium more uniform, which is advantageous for improving heat exchange efficiency and heat exchange uniformity and reducing the temperature difference in different regions of the battery cell (20), and the first separator (3358) can support the first heat conduction plate (3331) and improve the deformation resistance of the first heat conduction plate (3331).

[0466] The formation of the second flow path (35) may be formed in a different form, for example, continuing to refer to FIG. 13, the separating member (335) further includes a second separating part (3359), and both ends along the second direction (y) of the second separating part (3359) are connected to the main body part (3357) and the second heat conduction plate (3332), respectively, and the main body part (3357), the second separating part (3359), and the second heat conduction plate (3332) jointly define the second flow path (35).

[0467] The main body (3357) and the second separation part (3359) are both flat plate structures, and a second space is defined between the main body (3357) and the second heat conduction plate (3332). The number of second separation parts (3359) may be one or more, and in an embodiment where there are multiple second separation parts (3359), multiple second separation parts (3359) are spaced apart along the first direction (x), and the multiple second separation parts (3359) separate the second space into multiple second sub-spaces, so that the main body (3357), the second heat conduction plate (3332), and the multiple second separation parts (3359) together define multiple second flow paths (35). The main body (3357) and the second separating part (3359) can be formed integrally, for example, the main body (3357) and the second separating part (3359) are formed through an integral molding process such as pouring or extrusion. The main body (3357) and the second separating part (3359) are installed as powder and then connected as a whole through welding, screw connection, etc. Additionally, the main body (3357), the first separating part (3358), and the second separating part (3359) can be formed integrally.

[0468] The main body (3357), the second separator (3359), and the second heat conduction plate (3332) jointly define a plurality of second flow paths (35) so that the heat conduction member (3a) can accommodate more fluid medium and make the distribution of the fluid medium more uniform, which is advantageous for improving heat exchange efficiency and heat exchange uniformity and reducing the temperature difference in different regions of the battery cell (20), and the second separator (3359) can support the first heat conduction plate (3331) and improve the deformation resistance of the second heat conduction plate (3332).

[0469] The first Euro (34) and the second Euro (35) may extend along the same direction or along different directions. In this embodiment, the extension direction of the first Euro (34) and the extension direction of the second Euro (35) are the same. Both the first Euro (34) and the second Euro (35) extend along the second direction (y), which is convenient for manufacturing.

[0470] In the case of a fluid medium flowing within the first channel (34) and the second channel (35), the heat exchange capacity of the battery cell (20) corresponding to the fluid medium within the first channel (34) gradually weakens along the flow direction of the fluid medium, for example, a heat-conducting member (3a) is used to cool the battery cell (20), and along the flow direction of the fluid medium, the temperature of the fluid medium located in the first channel (34) and the second channel (35) gradually rises, and the ability of the fluid medium with a higher temperature to cool the battery cell (20) weakens.

[0471] Based on the considerations above, in some embodiments, along the extension direction of the first flow path (34) and the second flow path (35), the first flow path (34) has a first inlet (not shown in the drawing) and a first outlet (not shown in the drawing), and the second flow path (35) has a second inlet (not shown in the drawing) and a second outlet (not shown in the drawing), and the direction from the first inlet to the first outlet and the direction from the second inlet to the second outlet are opposite.

[0472] The first inlet is used for the fluid medium to enter the first flow path (34), and the first outlet is used for the fluid medium to be discharged outside the first flow path (34); the second inlet is used for the fluid medium to enter the second flow path (35), and the second outlet is used for the fluid medium to be discharged outside the second flow path (35).

[0473] For example, as illustrated in FIG. 61, in an embodiment in which a heat-conducting member (3a) is installed on both sides of a battery cell (20), one side of the battery cell (20) corresponds to a first flow path (34) of one heat-conducting member (3a), and the other side of the battery cell (20) corresponds to a second flow path (35) of another heat-conducting member (3a), and the fluid medium on both sides of the battery cell (20) flows along opposite directions, and along the extension direction (second direction (y)) of the first flow path (34) and the second flow path (35), the heat exchange capacity of the fluid medium in the first flow path (34) and the fluid medium in the second flow path (35) complements each other, thereby reducing the difference in local temperature of the battery cell (20).

[0474] Accordingly, the direction from the first inlet to the first outlet and the direction from the second inlet to the second outlet are opposite, that is, the flow direction of the fluid medium within the first channel (34) and the flow direction of the fluid medium within the second channel (35) are opposite, and the heat exchange effect is better in the area closer to the inlet of the corresponding channel in the battery cell (20), and the heat exchange effect is worse in the area closer to the outlet of the corresponding channel in the battery cell (20), and this arrangement of the first channel (34) and the second channel (35) can reduce local differences in heat management of the battery cell (20) within the battery (100) and make the heat exchange more uniform.

[0475] As illustrated in FIG. 62, in some embodiments, the heat-conducting member (3a) includes a connecting chamber (36) located at one end of the separating member (335), and a first flow path (34) is in communication with the connecting chamber (36), and a second flow path (35) is in communication with the connecting chamber (36).

[0476] The connecting chamber (36) is located at one end of the separating member (335), and the connecting chamber (36) is defined by jointly limiting the separating member (335), the first heat conduction plate (3331), and the second heat conduction plate (3332). In this embodiment, the connecting chamber (36) is a gap located between one end of the separating member (335) and the first heat conduction plate (3331) and the second heat conduction plate (3332) in the second direction (y).

[0477] In some other embodiments, the connecting chamber (36) may be formed by a different structure, for example, the heat conducting member (3a) further includes a connecting tube, the first flow path (34) and the second flow path (35) are connected through the connecting tube, and the internal passage of the connecting tube is the connecting chamber (36).

[0478] The number of first flow paths (34) and second flow paths (35) may all be multiple. In an embodiment where the number of first flow paths (34) is multiple, all first flow paths (34) may be in communication with a connecting chamber (36), and the fluid medium within each first flow path (34) is discharged from the first outlet to the outside of the first flow path (34), then passes through the connecting chamber (36) and enters the second flow path (35) from the second inlet. In some other embodiments, some of the first flow paths (34) among the multiple first flow paths (34) may be in communication with a connecting chamber (36), and the fluid medium within these first flow paths (34) passes through the connecting chamber (36) from the first outlet and then enters the second flow path (35) from the second inlet; Some of the multiple first channels (34) are not connected to the connecting chamber (36), and the fluid medium in these first channels (34) cannot enter the second channel (35). The direction indicated by the hollow arrow in FIG. 62 is the direction of flow of the fluid medium in the first channel (34) and the second channel (35).

[0479] In an embodiment in which the number of second channels (35) is multiple, all second channels (35) may be in communication with a connecting chamber (36), and a fluid medium within a first channel (34) may pass through the connecting chamber (36) and enter each second channel (35) from a second inlet after being discharged from the first outlet to the outside of the first channel (34). In some other embodiments, some of the second channels (35) among the multiple second channels (35) may be in communication with a connecting chamber (36), and a fluid medium within a first channel (34) in communication with a connecting chamber (36) passes through a connecting chamber (36) and enters a second channel (35) in communication with a connecting chamber (36) from a second inlet; and some of the other second channels (35) among the multiple second channels (35) are not in communication with a connecting chamber (36), and a fluid medium within a first channel (34) may not enter these second channels (35).

[0480] In this embodiment, the number of first flow paths (34) and second flow paths (35) are all multiple, and each first flow path (34) and each second flow path (35) is connected to a connecting chamber (36).

[0481] The number of the first Euro (34) and the second Euro (35) may be the same or different.

[0482] A first flow path (34) is connected to a connecting chamber (36) and a second flow path (35) is connected to a connecting chamber (36), and a fluid medium of the first flow path (34) can flow into the second flow path (35), and a fluid medium flowing out from the outlet (first outlet) of the first flow path (34) can flow into the second flow path (35) from the inlet (second inlet) of the second flow path (35), and this arrangement can reduce local differences in thermal management of the battery cell (20) in the battery (100) and make the heat exchange more uniform.

[0483] Referring to FIGS. 25, 26, 62, and 63, in some embodiments, the heat-conducting member (3a) includes a medium inlet (3412) and a medium outlet (3422), the medium inlet (3412) is in communication with a connecting chamber (36) through a first flow path (34), and the medium outlet (3422) is in communication with a connecting chamber (36) through a second flow path (35).

[0484] The medium inlet (3412) is installed on the first heat conduction plate (3331) and is connected to the first flow path (34), and the medium outlet (3422) is installed on the second heat conduction plate (3332) and is connected to the second flow path (35).

[0485] The fluid medium enters the first flow path (34) from the medium inlet (3412), passes through the connecting chamber (36) and flows into the second flow path (35), and is then discharged from the medium outlet (3422). During the flow, the fluid medium exchanges heat with the battery cell (20). The directions indicated by the air-core arrows in FIGS. 62 and 63 are all the flow directions of the fluid medium within the first flow path (34) and the second flow path (35).

[0486] The installation of the medium inlet (3412) and medium outlet (3422) is convenient for the fluid medium to enter the first flow path (34) and the second flow path (35), and convenient for the fluid medium to be discharged outside the first flow path (34) and the second flow path (35) after heat exchange with the battery cell (20), thereby allowing the fluid medium that has not undergone heat exchange to enter the first flow path (34) and the second flow path (35), thereby ensuring the heat exchange capacity of the fluid medium within the first flow path (34) and the second flow path (35).

[0487] Referring to FIG. 62 and FIG. 63, in some embodiments, along the extension direction of the first flow path (34), a medium inlet (3412) is installed at one end of the first heat conduction plate (3331) away from the connection chamber (36); and along the extension direction of the second flow path (35), a medium outlet (3422) is installed at one end of the second heat conduction plate (3332) away from the connection chamber (36).

[0488] The extension direction of the first flow path (34) and the extension direction of the second flow path (35) are both parallel to the second direction (y). In some other embodiments, the extension direction of the first flow path (34) and the extension direction of the second flow path (35) may be different, for example, the extension direction of the first flow path (34) is parallel to the second direction (y) and the extension direction of the second flow path (35) is parallel to a predetermined direction, and the angle between the predetermined direction and the second direction (y) is acute, or the predetermined direction is perpendicular to the second direction (y) and the predetermined direction is perpendicular to the first direction (x).

[0489] A media inlet pipe (344) is inserted into the media inlet (3412), making it convenient for the media inlet (3412) to communicate with a device that provides a fluid medium. A media outlet pipe (38) is inserted into the media outlet (3422), making it convenient for the media outlet (3422) to communicate with a device that recovers a fluid medium.

[0490] A medium inlet (3412) is installed at one end away from the connection chamber (36) of the first heat conduction plate (3331), and a medium outlet (3422) is installed at one end away from the connection chamber (36) of the second heat conduction plate (3332). The fluid medium flows into the first flow path (34) from the medium inlet (3412), passes through the entire first flow path (34) along the extension direction of the first flow path (34), flows into the second flow path (35), and also passes through the entire second flow path (35) along the extension direction of the second flow path (35) and is discharged from the medium outlet (3422). This makes the path through which the fluid medium passes within the heat management member (30) the longest, thereby allowing sufficient heat exchange with the battery cell (20) to improve heat exchange efficiency and heat exchange uniformity.

[0491] As illustrated in FIG. 62 and FIG. 63, in some embodiments, the first flow path (34) and the second flow path (35) are not connected to each other, with one end of the first flow path (34) extending away from the connecting chamber (36) along its extension direction and the other end of the second flow path (35) extending away from the connecting chamber (36) along its extension direction.

[0492] In this embodiment, the extension direction of the first flow path (34) and the extension direction of the second flow path (35) are both parallel to the second direction (y). The connecting chamber (36) is located at one end along the second direction (y) of the separating member (335). As shown in FIG. 63, the heat conducting member (3a) further includes a blocking member (39) (or referred to as a blocking member), and the blocking member (39) is installed at one end of the separating member (335) that is away from the connecting chamber (36) along the second direction (y) to block the end of the second flow path (35) that is away from the connecting chamber (36) along the second direction (y), thereby preventing the fluid medium entering the first flow path (34) from the medium inlet (3412) from flowing into the second flow path (35) along the direction facing away from the connecting chamber (36) within the first flow path (34). Of course, in some other embodiments, the blocking member (39) is installed at one end of the separation member (335) away from the connecting chamber (36) along the second direction (y) and may be used to block the one end of the first flow path (34) away from the connecting chamber (36) along the second direction (y), thereby preventing the fluid medium entering the first flow path (34) from the medium inlet (3412) from flowing into the second flow path (35) along the direction away from the connecting chamber (36) within the first flow path (34).

[0493] The blocking member (39) and the separating member (335) may be installed as powder, and the blocking member (39) and the separating member (335) installed as powder are connected to the entire structure, for example, the blocking member (39) and the separating member (335) are connected as a whole through methods such as welding or bonding. The blocking member (39) and the separating member (335) may be formed integrally, for example, through an integral molding process such as pouring and stamping.

[0494] Along the stacking direction of the first heat conduction plate (3331), the second heat conduction plate (3332), and the separation member (335), the projection from the separation member (353) of the medium outlet (3422) is located on one side facing the connection chamber (36) from the blocking member (39), so that the fluid medium of the second flow path (35) can be discharged from the medium inlet (3412).

[0495] The first flow path (34) and the second flow path (35) are not connected to each other, with the first flow path (34) extending from the connecting chamber (36) along its extension direction and the second flow path (35) extending from the connecting chamber (36) along its extension direction. The fluid medium must enter the first flow path (34), pass through the entire first flow path (34), then enter the second flow path (35) from the connecting chamber (36), pass through the entire second flow path (355), and then be discharged from the medium outlet (3422). This makes the path through which the fluid medium passes within the heat management member (30) the longest, thereby allowing sufficient heat exchange with the battery cell (20) to improve heat exchange efficiency and heat exchange uniformity.

[0496] In some embodiments, the first flow path (34) and the second flow path (35) are both multiple, and each first flow path (34) and each second flow path (35) are all connected to the connecting chamber (36).

[0497] In some other embodiments, the number of first channels (34) may be one and the number of second channels (35) may be multiple, and each second channel (35) may be in communication with the connecting chamber (36); or the number of first channels (34) and the number of second channels (35) may both be one; or the number of second channels (35) may be one and the number of first channels (34) may be multiple, and each first channel (34) may be in communication with the connecting chamber (36).

[0498] The first flow path (34) and the second flow path (35) are both multiple and all are connected to the connecting chamber (36), and the fluid medium of each first flow path (34) can flow into each second flow path (35), and the fluid medium flowing out from the outlet of the first flow path (34) can flow into the second flow path (35) from the inlet of the second flow path (35). This arrangement can reduce local differences in thermal management of the battery cell (20) within the battery (100) and make the heat exchange more uniform.

[0499] In an embodiment where the first flow path (34) is multiple, the number of media inlets (3412) can be varied, and for example, referring to FIG. 53 and FIG. 63, in some embodiments, there is one media inlet (3412), and each first flow path (34) is connected to a connecting chamber (36) and a media inlet (3412).

[0500] In an embodiment in which a blocking member (39) blocks one end of the second flow path (35) away from the connecting chamber (36), as shown in FIG. 63, a shunt gap (310) is formed between the first heat conduction plate (3331) and the second heat conduction plate (3332) and between the side of the blocking member (39) facing away from the connecting chamber (36), and the medium inlet (3412) and each first flow path (34) are connected through the shunt gap (310). A fluid medium introduced from the medium inlet (3412) enters the shunt gap (310) and then is distributed from the shunt gap (310) to each first flow path (34).

[0501] Accordingly, there is only one medium inlet (3412), which is convenient for implementing synchronous flow of fluid medium into each first flow path (34), and also, the number of medium inlets (3412) installed on the first heat conduction plate (3331) is smaller, thereby reducing the impact of the installation of the medium inlets (3412) on the structural strength of the first heat conduction plate (3331). In addition, the structure of the structural heat conduction member (3a) is simpler and more convenient to manufacture.

[0502] In some other embodiments, there are multiple media inlets (3412), and each first flow path (34) is connected to a connecting chamber (36) and one media inlet (3412).

[0503] The number of media inlets (3412) is equal to the number of first flow paths (34) and corresponds one-to-one. Each media inlet (3412) is used to allow fluid media to flow into the corresponding first flow path (34), which is convenient for independently controlling the fluid media entry situation of each first flow path (34) and for controlling the first flow path (34) into which fluid media should enter according to actual needs, thereby controlling the distribution of fluid media inside the heat control tube and making it convenient for rationally controlling the temperature of the battery cell (20).

[0504] In an embodiment where the second flow path (35) is multiple, as shown in FIG. 52, there are multiple media outlets (3422), and each second flow path (35) is connected to a connecting chamber (36) and one media outlet (3422).

[0505] There are multiple second flow paths (35) and multiple media outlets (3422), and the media outlets (3422) and the second flow paths (35) are installed in a one-to-one correspondence, and the fluid medium within each second flow path (35) is discharged from the corresponding media outlet (3422).

[0506] In some other embodiments, the medium outlet (3422) may be one, and the medium outlet (3422) is connected to each second flow path (35), and the fluid medium in all second flow paths (35) is discharged from the medium outlet (3422).

[0507] Each second flow path (35) is connected to a connecting chamber (36) and a medium outlet (3422), allowing the fluid medium to be discharged more quickly through the second flow path (35), thereby improving heat exchange efficiency.

[0508] In some embodiments, the separating member (335) is an integrally molded structure.

[0509] The separating member (335) may be a structure formed by an integral molding method such as stamping or pouring. In an embodiment where the separating member (335) is a wave plate, the wave plate is formed by stamping. The separating member (335) is an integral molded structure, which is convenient for manufacturing and has superior structural strength.

[0510] In some embodiments, the first heat conduction plate (3331) may be a single-piece molded structure and the second heat conduction plate (3332) may be a single-piece molded structure, for example, the first heat conduction plate (3331) and the second heat conduction plate (3332) are both formed by pouring or stamping.

[0511] In some embodiments, the first heat conduction plate (3331) is welded to the separating member (335), and / or, the second heat conduction plate (3332) is welded to the separating member (335).

[0512] The first heat conduction plate (3331) is welded to the separation member (335), and the second heat conduction plate (3332) and the separation member (335) may be connected in a different way (e.g., adhesive), or the second heat conduction plate (3332) and the separation member (335) may be in contact and have no connection relationship, and the second heat conduction plate (3332) is welded to the separation member (335), and the first heat conduction plate (3331) and the separation member (335) may be connected in a different way (e.g., adhesive), or the first heat conduction plate (3331) and the separation member (335) may be in contact and have no connection relationship, and in this embodiment, both the first heat conduction plate (3331) and the second heat conduction plate (3332) are welded to the separation member (335).

[0513] In an embodiment where the separating member (335) is a wave-shaped plate, the first heat conduction plate (3331) is welded to the second protrusion (3356) and the second heat conduction plate (3332) is welded to the first protrusion (3354) (see FIG. 58). This connection method allows the separating member (335) to support the first heat conduction plate (3331) and the second heat conduction plate (3332), thereby improving the ability of the first heat conduction plate (3331) and the second heat conduction plate (3332) to resist expansion deformation of the battery cell (20).

[0514] Through welding, the first heat conduction plate (3331) and the separating member (335) improve the connection stability between the first heat conduction plate (3331) and the separating member (335), and through welding, the second heat conduction plate (3332) and the separating member (335) improve the connection stability between the second heat conduction plate (3332) and the separating member (335).

[0515] As illustrated in FIG. 64, the battery (100) comprises an adjacent first battery cell (21), a second battery cell (22), and a heat-conducting member (3a), the heat-conducting member (3a) is installed between the first battery cell (21) and the second battery cell (22), the first heat-conducting plate (3331) is heat-conductively connected to the first battery cell (21), and the second heat-conducting plate (3332) is heat-conductively connected to the second battery cell (22).

[0516] The fluid medium in the first flow path (34) and the fluid medium in the second flow path (35) each exchange heat with the first battery cell (21) and the second battery cell (22), thereby reducing the temperature difference between the first battery cell (21) and the second battery cell (22).

[0517] The expansion of the first battery cell (21) does not reduce the dimensions of the second flow path (35) corresponding to the second battery cell (22) by compression, or has a very small effect on the dimensions of the second flow path (35) corresponding to the second battery cell, thereby ensuring the heat exchange capacity of the second flow path (35) corresponding to the second battery cell (22); the expansion of the second battery cell (22) does not reduce the dimensions of the first flow path (34) corresponding to the first battery cell (21) by compression, or has a very small effect on the dimensions of the first flow path (34) corresponding to the first battery cell, thereby ensuring the heat exchange capacity of the first flow path (34) corresponding to the first battery cell (21), and thus ensures the safety performance of the battery (100) using the corresponding heat conduction member (3a).

[0518] Additionally, since the first flow path (34) and the second flow path (35) correspond to the first battery cell (21) and the second battery cell (22), respectively, the first flow path (34) can withstand deformation caused by the expansion of the first battery cell (21), and the second flow path (35) can withstand deformation caused by the expansion of the second battery cell (22). Therefore, the expansion of the first battery cell (21) has very 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 very little interference with the expansion of the first battery cell (21) or does not affect the expansion of the first battery cell (21). This is advantageous for the expansion release of the first battery cell (21) and the second battery cell (22), and the first battery cell (21) and the second battery cell (22) due to mutual interference in the expansion of the first battery cell (21) and the second battery cell (22). By reducing the pre-pressure release or severe thermal runaway accident of the cell (22), the safety performance of the battery (100) is further improved.

[0519] Referring further to FIG. 64, in some embodiments, a heat-conducting member (3a) may be installed on one side facing away from the second battery cell (22) from the first battery cell (21), and a reinforcing member (30) may be installed on one side facing away from the first battery cell (21) from the second battery cell (22).

[0520] For convenience of explanation, a heat-conducting member (3a) located between the first battery cell (21) and the second battery cell (22) is defined as the first heat-conducting member, a heat-conducting member (3a) on one side facing away from the second battery cell (22) from the first battery cell (21) is defined as the second heat-conducting member, and a heat-conducting member (3a) on one side facing away from the first battery cell (21) from the second battery cell (22) is defined as the third heat-conducting member.

[0521] The flow direction of the fluid medium in the first channel (34) of the first heat conduction member and the flow direction of the fluid medium in the second channel (35) are opposite. The flow direction of the fluid medium in the first channel (34) of the second heat conduction member and the flow direction of the fluid medium in the second channel (35) are opposite. The flow direction of the fluid medium in the first channel (34) of the third heat conduction member and the flow direction of the fluid medium in the second channel (35) are opposite.

[0522] The second heat conduction plate (3332) of the second heat conduction member is thermally connected to one side facing away from the second battery cell (22) from the first battery cell (21), and the direction of flow of the fluid medium in the first flow path (34) of the first heat conduction member and the direction of the heat conduction member (3a) in the second flow path (35) of the second heat conduction member are opposite. In this way, the heat exchange capacity along the second direction (y) of the fluid medium located on both sides of the first battery cell (21) is complemented by each other, so that the difference in local temperature of the first battery cell (21) can be reduced.

[0523] The first heat conduction plate (3331) of the third heat conduction member is thermally connected to one side facing away from the first battery cell (22), and the direction of flow of the fluid medium in the second flow path (35) of the first heat conduction member and the direction of the heat conduction member (3a) in the first flow path (34) of the third heat conduction member are opposite. In this way, the heat exchange capacity according to the second direction (y) of the fluid medium located on both sides of the second battery cell (22) is complemented by each other, so that the difference in local temperature of the second battery cell (22) can be reduced.

[0524] In some embodiments, as shown in FIGS. 65 to 82, at least a portion of the heat-conducting member (3a) is configured to be deformable when pressed, which is convenient for the heat-conducting member (3a) to provide a certain expansion space to the battery cell (20), and is advantageous for reducing the compression force between the heat-conducting member (3a) and the battery cell (20).

[0525] In some embodiments, as illustrated in FIG. 65, the heat-conducting member (3a) comprises a stacked heat exchange layer (400) and a compression layer (500). The heat exchange layer (400) can improve the heat exchange efficiency of the battery cell (20) and improve the heat dissipation of the battery cell (20). The elastic modulus of the compression layer (500) is smaller than the elastic modulus of the heat exchange layer (400). After receiving the expansion force released from the battery cell (20), the compression layer (500) is deformed along the direction of the expansion force of the battery cell (20), absorbing a portion of the expanded battery cell (20) to ensure the expansion space of the battery cell (20), thereby avoiding greater deformation of the entire battery (100). Additionally, the compression layer (500) is advantageous for absorbing tolerances during battery assembly, making it convenient for mounting and maintaining the compact structure of the battery.

[0526] 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 the temperature of the heat exchange layer (400), heat from the battery cell (20) is transferred to the heat exchange layer (400) to lower the temperature of the battery cell (20); when the temperature of the battery cell (20) is lower than the heat exchange temperature, heat from the heat exchange layer (400) is transferred to the battery cell (20) to raise the temperature of the battery cell (20).

[0527] Compressive layering (500) is a layered structure in which compression and deformation are greater after receiving an applied force.

[0528] Optionally, after the compression layer (500) receives a force acting along the stacking direction, the compression layer (500) may be compressed along the stacking direction to cause a greater deformation.

[0529] The elastic modulus refers to the directly proportional relationship between stress and deformation in a material or structure during the elastic deformation phase. Under the premise that the stress is constant during the elastic deformation phase, a higher elastic modulus results in a lower deformation capacity of the material or structure; conversely, a lower elastic modulus results in a higher deformation capacity.

[0530] The number of layers of the heat exchange layer (400) may be one or more layers, and the number of layers of the compression layer (500) may be one or more layers.

[0531] For example, as illustrated in FIG. 66, the heat-conducting member (3a) comprises a heat exchange layer (400) and a compression layer (500); as illustrated in FIG. 67, the heat-conducting member (3a) comprises a heat exchange layer (400) and a compression layer (500), with the compression layer (500) installed between the two heat exchange layers (400); and as illustrated in FIG. 68, the heat-conducting member (3a) comprises a heat exchange layer (400) and a compression layer (500), with the heat exchange layer (400) installed between the two compression layers (500).

[0532] In some embodiments, the compressible layer (500) includes a compressible chamber (501), and the compressible chamber (501) is a cavity in which the volume of the compressible layer (500) decreases after receiving a force.

[0533] After receiving the expansion force released from the battery cell (20), the gas in the compressible chamber (501) is compressed so that the compressible layer (500) is deformed along the direction of the expansion force action of the battery cell (20).

[0534] In some embodiments, the compressible chamber (501) is filled with a phase change material or an elastic material.

[0535] Phase change materials refer to substances capable of changing their state and providing latent heat without a change in temperature. The process of converting physical properties is called a phase change process, during which phase change materials absorb or release a large amount of latent heat.

[0536] Elastic materials refer to materials with a lower elastic modulus, and elastic materials can be deformed more significantly under the action of the expansion force of the battery cell.

[0537] When a phase change material is filled in the compressible chamber (501), the thermal capacity of the battery can be increased so that the heat-conducting member (3a) can insulate the battery cell (20) or absorb the heat of the battery cell (20); when an elastic material is filled in the compressible chamber (501), the elastic material has better elasticity and, after receiving the expansion force released from the battery cell, the elastic material is compressed so that the compressible layer (500) is deformed along the direction of the expansion force of the battery cell (20), and repulsion is achieved after the expansion force is removed, and additionally, the elastic material may increase the support strength of the compressible layer (500).

[0538] Optionally, the elastic material includes rubber material.

[0539] In some embodiments, the heat exchange layer (400) includes a heat exchange chamber (401) (also referred to as the hollow cavity (30a) described above) for receiving a heat exchange medium. The heat exchange medium is a medium for heat exchange with the battery cell and is generally a liquid having a larger specific heat capacity and capable of maintaining fluidity at the battery operating temperature.

[0540] Optionally, the heat exchange chamber (401) can be sealed or opened.

[0541] In some embodiments, as illustrated in FIG. 69, a first support member (410) (also referred to as a reinforcing rib described above) is installed in the heat exchange chamber (401), and the first support member (410) is structured to support the heat exchange chamber (401) to prevent the heat exchange chamber (401) from being compressed and deformed. The first support member (410) can be used to improve the strength of the heat exchange layer (400), thereby avoiding greater deformation of the heat exchange layer (400) after receiving the expansion force released from the battery cell.

[0542] Optionally, the elastic modulus of the first support member (410) is greater than the elastic modulus of the compressible layer (500).

[0543] Since the elastic modulus of the compression layer (500) is smaller than that of the first support member (410) and thus deforms more easily, after the heat conduction member (3a) receives the expansion force released from the battery cell, the compression layer (500) can deform more significantly along the direction of the expansion force action of the battery cell (20), but the heat exchange layer (400) is not deformed.

[0544] In some embodiments, the heat exchange layer (400) and the compression layer (500) are stacked along a first direction, and the first support member (410) is supported in the heat exchange chamber (401) along the first direction (x).

[0545] When applying the heat-conducting member (3a) to the battery, the battery cell (20) is generally made to come into contact with the heat-conducting member (3a) along the first direction (x), and the expansion force released from the subsequent battery cell (20) also basically follows the first direction (x). The first support member (410) supported in the heat exchange chamber (401) along the first direction (x) can increase the elasticity modulus of the heat exchange layer (400) more significantly, and thus, after the heat-conducting member (3a) receives the expansion force along the first direction (x) released from the battery cell, the compression layer (500) can be deformed more significantly along the first direction (x), but the heat exchange layer (400) basically does not deform.

[0546] In some embodiments, referring to FIG. 67, the compression layer (500) is installed in the heat exchange chamber (401).

[0547] Both ends along the stacking direction of the heat-conducting member (3a) are heat exchange chambers (401), which effectively improves the heat exchange efficiency of the battery cells at both ends of the heat-conducting member (3a), thereby allowing the temperature of the entire battery to be maintained at a lower level.

[0548] In some embodiments, as shown in FIG. 70, a first connecting structure (420) (also called the first reinforcing rib described above) for fixing the compression layer (500) to the heat exchange chamber (401) is also installed in the heat exchange chamber (401).

[0549] The first connecting structure (420) is a structure in which both ends are respectively connected to the inner wall of the heat exchange chamber (401) and the outer wall of the compression layer (500). The first connecting structure (420) can fix the compression layer (500) and prevent a change in the position of the compression layer (500) relative to the heat exchange chamber (401).

[0550] Optionally, at least some of the first connecting structures (420) are installed in the heat exchange chamber (401) along the stacking direction. The first connecting structures (420) can, on the one hand, secure the compression layer (500) and on the other hand, be used to increase the strength of the heat exchange layer (400), thereby avoiding greater deformation of the heat exchange layer (400) after receiving the expansion force released from the battery cell.

[0551] In some embodiments, a heat exchange space is defined between the outer wall of the compression layer (500) and the inner wall of the heat exchange chamber (401), and a first connecting structure (420) is installed in the heat exchange space and divides the heat exchange space into a plurality of flow paths (402) (also called flow paths (30c)).

[0552] Multiple channels (402) are advantageous for the heat exchange medium to flow circulatingly in the heat exchange space, thereby preventing a higher temperature of the local heat conduction member (3a).

[0553] Optionally, a plurality of first connection structures (420) are installed in the heat exchange chamber (401).

[0554] Optionally, the elastic modulus of the first connecting structure (420) is greater than the elastic modulus of the compressible layer (500).

[0555] In some embodiments, with reference to FIGS. 71 to 74, the compressible layer (500) includes a first compressible tube (510), and the heat exchange layer (400) includes a first heat exchange tube (430), and the first compressible tube (510) is installed in the first heat exchange tube (430).

[0556] The first compressible tube (510) has a compressible chamber (501) inside and is a tubular structure capable of extrusion deformation.

[0557] The first heat exchange tube (430) is a tubular structure having a heat exchange chamber (401) inside, and is a tubular structure having at least one first connecting structure (420) installed in the heat exchange chamber (410), and the end of the at least one first connecting structure (420) is defined to limit the first mounting chamber (431) in which the first compressible tube (510) is installed.

[0558] The heat-conducting member (3a) according to the present application is configured to be installed by covering the first compressible tube (510) and the first heat exchange tube (430), which is advantageous for molding the heat-conducting member (3a).

[0559] Optionally, after the first compressible tube (510) and the first heat exchange tube (430) are installed, the end of at least one of the first connecting structures (420) of the first heat exchange tube (430) comes into contact with the outer wall of the first compressible tube (510).

[0560] Optionally, the heat-conducting member (3a) is mounted on the battery and has a third direction (z) corresponding to the height direction of the battery cell, and two first connecting structures (420) extending along the third direction (z) are installed within the first heat exchanger (430), and the two first connecting structures (420) are each installed at both ends along the third direction (z) in the first heat exchanger (430).

[0561] Optionally, the first heat exchanger (430) is provided with two opposing first contact surfaces (432) for contacting the first wall (201) which is the face of the battery cell. The first contact surfaces (432) can increase the contact area between the first heat exchanger (430) and the battery cell, thereby improving the thermal conductivity of the heat-conducting member (3a) to the battery cell.

[0562] Optionally, the first compressible tube (510) has two opposing first mating surfaces (511) for engaging with the first wall (201) which is the opposite side of the battery cell. The expansion deformation of the battery cell generally follows a direction perpendicular to the opposite side, and the first mating surfaces (511) are deformed under the action of the expansion force of the battery cell so as to absorb the expanded portion of the battery cell.

[0563] In some embodiments, optionally, with reference to FIG. 68, the heat exchange layer (400) is installed in a compressible chamber (501).

[0564] Both ends along the stacking direction of the heat conduction member (3a) are heat exchange chambers (401), which can effectively improve the deformation capacity of the heat conduction member (3a), so that after receiving the expansion force released from the battery cells at both ends along the stacking direction, the heat conduction member (3a) is better deformed and can absorb the expansion portion released from the battery cells.

[0565] In some embodiments, the compressible layer (500) includes a thermal conductive wall that defines the compressible chamber (501).

[0566] The heat conduction wall is a wall structure that has a better heat conduction effect than the compression layer (500).

[0567] As an example, the material of the thermal conductive wall may be thermally conductive silica gel, metal, etc.

[0568] The outer wall of the compression layer (500) is a heat-conducting wall, which effectively transfers heat from the battery cell to the internal heat exchange layer (400) for heat exchange.

[0569] In some embodiments, with reference to FIGS. 75 to 78, FIG. 75 is a schematic diagram of the structure of a second heat exchange tube according to some embodiment of the present application, FIG. 76 is a schematic diagram of the structure of a second compressible tube according to some embodiment of the present application, FIG. 77 is a side view of a second compressible tube according to some embodiment of the present application, and FIG. 78 is a schematic diagram of the structure after assembly of the second compressible tube and the second heat exchange tube according to some embodiment of the present application. The compressible layer (500) includes a second compressible tube (520), and the heat exchange layer (400) includes a second heat exchange tube (440), and the second heat exchange tube (440) is installed over the second compressible tube (520).

[0570] The second heat exchange tube (440) is a tubular structure having a heat exchange chamber (401) inside.

[0571] The second compressible tube (520) is a tubular structure having a compressible chamber (501) inside, and is a tubular structure having at least one second connecting structure (530) installed in the compressible chamber (501), and the end of the at least one second connecting structure (530) is defined to limit the second mounting chamber (521) in which the second heat exchange tube (440) is installed.

[0572] The heat-conducting member (3a) according to the present application is configured to be installed by covering the second compressible tube (520) and the second heat exchange tube (440), which is advantageous for molding the heat-conducting member (3a).

[0573] Optionally, after the second compressible tube (520) and the second heat exchange tube (440) are installed, the end of at least one second connecting structure (530) of the second compressible tube (520) comes into contact with the outer wall of the second heat exchange tube (440).

[0574] Optionally, the heat-conducting mem...

Claims

Claim 1 A battery comprising a box body, at least two battery cells, and a heat-conducting member for accommodating a heat exchange medium, wherein the box body comprises a receiving chamber; wherein the at least two battery cells are accommodated within the receiving chamber, and each of the battery cells comprises an electrode assembly and an electrode terminal that are electrically connected, and each of the battery cells comprises a first wall having the largest area among the battery cells; wherein the heat-conducting member is connected to at least two battery cells, and the heat-conducting member is installed opposite to the first wall of at least two battery cells, and the heat-conducting member is thermally connected to the first wall of at least two battery cells to control the temperature of at least two battery cells using the heat exchange medium, and wherein the battery cells are a plurality and arranged along a second direction; wherein the heat-conducting member includes a separator that 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. Claim 2 In claim 1, the thermal conductive member is a battery that is adhered to the first wall of at least two of the battery cells through a first adhesive layer. Claim 3 A battery according to paragraph 2, wherein the bottom portion of the heat-conducting member is bonded to the bottom wall of the receiving chamber through a second adhesive layer; and / or the bottom portion of the battery cell is bonded to the bottom wall of the receiving chamber through a third adhesive layer. Claim 4 A battery according to paragraph 3, wherein the thickness of the first adhesive layer is less than or equal to the thickness of the second adhesive layer; and / or the thickness of the first adhesive layer is less than or equal to the thickness of the third adhesive layer. Claim 5 A battery according to paragraph 3, wherein the thermal conductivity of the first adhesive layer is greater than or equal to the thermal conductivity of the second adhesive layer; and / or the thermal conductivity of the first adhesive layer is greater than or equal to the thermal conductivity of the third adhesive layer. Claim 6 A battery according to claim 3, wherein the ratio between the thickness of the first adhesive layer and the thermal conductivity of the first adhesive layer is a first ratio, the ratio between the thickness of the second adhesive layer and the thermal conductivity of the second adhesive layer is a second ratio, and the ratio between the thickness of the third adhesive layer and the thermal conductivity of the third adhesive layer is a third ratio, wherein the first ratio is less than or equal to the second ratio; and / or the first ratio is less than or equal to the third ratio. Claim 7 In claim 1, the battery further comprises an insulating layer for insulating and isolating the first wall of the battery cell and the separator plate. Claim 8 A battery according to claim 1, wherein in the third direction, the dimension H1 of the separator plate and the dimension H2 of the first wall satisfy 0.1 ≤ H1 / H2 ≤ 2, and the third direction is perpendicular to the second direction and parallel to the first wall. Claim 9 A battery according to claim 1, wherein a hollow cavity is installed inside the separator plate. Claim 10 In claim 9, the above hollow cavity is a battery used to accommodate a heat exchange medium for controlling the temperature of the battery cell. Claim 11 In claim 9, in the first direction, the dimension of the hollow cavity is W, and the capacity Q of the battery cell and the dimension W of the hollow cavity satisfy 1.0Ah / mm ≤ Q / W ≤ 400Ah / mm, and the first direction is perpendicular to the first wall. Claim 12 In claim 10, the separator further comprises a pair of heat conduction plates installed oppositely along a first direction, the hollow cavity installed between the pair of heat conduction plates, and the first direction being perpendicular to the first wall. Claim 13 In claim 12, the battery further comprises a reinforcing rib installed between the pair of heat conduction plates, wherein the separator plate is a battery. Claim 14 In paragraph 13, the reinforcing rib is a battery connected to at least one of the pair of heat conduction plates. Claim 15 In claim 14, the reinforcing rib comprises a first reinforcing rib having both ends connected to the pair of heat conduction plates, and the first reinforcing rib is installed at an angle with respect to the first direction. Claim 16 A battery according to claim 15, wherein the angle of insertion of the first reinforcing rib and the first direction is 30° to 60°. Claim 17 In paragraph 15, the reinforcing rib further comprises a second reinforcing rib, one end of the second reinforcing rib is connected to one of the pair of heat conduction plates, and the other end of the second reinforcing rib is installed spaced apart from the other of the pair of heat conduction plates. Claim 18 In paragraph 17, the second reinforcing rib extends along the first direction and protrudes from one of the pair of heat conduction plates. Claim 19 In Clause 17, the first reinforcing rib and the second reinforcing rib are installed spaced apart. Claim 20 A battery according to claim 12, wherein in the first direction, the thickness D of the heat conduction plate and the dimension W of the hollow cavity satisfy 0.01 ≤ D / W ≤ 25. Claim 21 A battery according to claim 12, wherein the separator plate is provided with a media inlet and a media outlet, the hollow cavity is connected to the media inlet and the media outlet, and a cavity separated from both the media inlet and the media outlet is provided inside the separator plate. Claim 22 A battery according to claim 1, wherein at least a portion of the heat-conducting member is configured to be deformable when pressurized. Claim 23 A battery according to claim 1, wherein the heat-conducting member is provided with a yield structure to provide space for the expansion of the battery cell. Claim 24 A battery according to claim 1, wherein each of the above-mentioned battery cells further comprises a battery box containing an electrode assembly inside, and the battery box is equipped with a pressure relief mechanism formed integrally with the battery box. Claim 25 In paragraph 24, the battery box comprises a non-vulnerable area and a vulnerable area formed integrally, and a groove is installed in the battery box, the non-vulnerable area is formed around the groove, the vulnerable area is formed at the bottom of the groove, and the vulnerable area is configured to be destroyed when the battery cell releases internal pressure, and the pressure release mechanism comprises the battery including the vulnerable area. Claim 26 A battery according to claim 1, wherein the electrode assembly comprises a positive electrode sheet and a negative electrode sheet, and the positive electrode sheet and / or the negative electrode sheet comprises a current collector and an active material layer, and the current collector comprises a support layer and a conductive layer, wherein the support layer is used to bear the conductive layer and the conductive layer is used to bear the active material layer. Claim 27 In claim 1, the electrode assembly comprises an anode sheet, wherein the anode sheet comprises an anode current collector and an anode active material layer coated on the surface of the anode current collector, the anode active material layer comprises an anode active material, and the anode active material comprises an inner core and a shell covering the inner core, and the inner core is a ternary material, dLi2MnO 3· (1-d) A cell comprising at least one of LiMO2 and LiMPO4, wherein 0 < d < 1, and M comprises one or more selected from Fe, Ni, Co, and Mn, wherein the shell comprises a crystalline inorganic material, and the full width at half maximum of the main peak of the crystalline inorganic material measured by X-ray diffraction is 0 to 3°, and the crystalline inorganic material comprises one or more selected from metal oxides and inorganic salts. Claim 28 In claim 1, the electrode assembly comprises an anode sheet, wherein the anode sheet comprises an anode current collector and an anode active material layer coated on the surface of the anode current collector, wherein the anode active material layer comprises an anode active material, wherein the anode active material comprises LiMPO4, wherein M comprises Mn and a non-Mn element, wherein the ionic radius of the non-Mn element is a and the ionic radius of the manganese element is b, and |ab| / b is 10% or less; and the valence conversion voltage of the non-Mn element is U and 2V <U<5.5V이고;상기 비 Mn 원소와 O에 의해 형성된 화학 결합의 화학 활성은 P-O 결합의 화학 활성 이상이며;상기 비 Mn 원소의 최고 원자가는 6 이하인,조건 중 적어도 하나를 충족하는 전지. Claim 29 An electric device comprising a battery according to any one of claims 1 to 28 used to supply electric energy. 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