Battery cell assembly, battery module and battery pack

Abstract

The invention belongs to the technical field of batteries, and discloses a battery cell assembly, a battery module and a battery pack, and the battery cell assembly comprises an electric connection adapter and a battery cell box; the battery cell box comprises a battery cell box main body and an adapter accommodating part arranged on the battery cell box main body, the battery cell box main body is used for placing a battery cell, the electric connection adapter is arranged in the adapter accommodating part, and the electric connection adapter is used for connecting a battery cell connecting device. And a tab of the battery cell is connected to the battery cell connecting device through the electric connection adapter. According to the invention, the precision requirement on vertical alignment of the connection of the tab and the battery cell connecting device is reduced, the time and labor required for assembly are reduced, the production cost is reduced, meanwhile, the problem of poor contact caused by improper welding or connection due to vertical connection can be reduced, the reliability of the electrical connection of the tab and the battery cell connecting device is improved, and the production efficiency is improved. And the thermal safety protection of the whole module is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of batteries, and in particular to a battery core assembly, a battery module and a battery pack. Background Art

[0002] When the existing soft-pack battery cells are placed vertically on the large surface of the battery system bottom plate, the electrical connection surface of the battery cell's tab is directly connected to the CCS (Cell Connection System) component of the battery system. However, since the tabs of the vertically placed battery cells are perpendicular to the large surface of the battery system bottom plate, the bus in the CCS component can only be connected to the tabs in the vertical direction of the large surface of the battery system bottom plate, which requires precise operation and customized fixtures to ensure the correct alignment and connection between the two, making the operation of the CCS component and the battery cell more difficult during assembly. If the connection is achieved by welding, vertical welding may result in inconsistent welding quality due to gravity and the fluidity of the welding material. Summary of the invention

[0003] The main purpose of the present invention is to provide a battery cell assembly, a battery module and a battery pack, aiming to solve the technical problem that the existing battery cell tabs can only be connected to the CCS assembly in the vertical direction of the large surface of the battery system bottom plate, resulting in difficult assembly and complicated operation.

[0004] In order to achieve the above-mentioned invention object, the present invention provides a battery cell assembly, including an electrical connection adapter and a battery cell box;

[0005] The battery cell box includes a battery cell box body and an adapter accommodating portion arranged on the battery cell box body, the battery cell box body is used to place the battery cell, the electrical connection adapter is arranged in the adapter accommodating portion, the electrical connection adapter is used to connect the battery cell connecting device, and the electrode tab of the battery cell is connected to the battery cell connecting device through the electrical connection adapter.

[0006] Furthermore, the battery box body includes a first support frame and a first heat conducting sheet, the first support frame is arranged corresponding to the first heat conducting sheet, and at least two sides of the first heat conducting sheet are connected to the first support frame.

[0007] Further, the adapter accommodating portion includes a first accommodating portion and a first limiting portion, the first accommodating portion is arranged on the first supporting frame for placing the electrical connection adapter, the first limiting portion is arranged on a side of the first accommodating portion away from the first supporting frame, and a plurality of exhaust grooves are arranged on the first limiting portion.

[0008] Furthermore, the electrical connection adapter includes a first welding portion, and a second welding portion located at the end of the first welding portion, the first welding portion is connected to the second welding portion through a transition portion, and the transition portion is inclined from the second welding portion to the first welding portion.

[0009] Furthermore, the electrical connection adapter includes a third welding portion, and a fourth welding portion connected to an end of the third welding portion, and the third welding portion and the fourth welding portion are perpendicular to each other.

[0010] Furthermore, the battery box body includes a second support frame and a second heat conducting sheet, the second support frame is arranged corresponding to the second heat conducting sheet, and a plurality of side edges of the second heat conducting sheet are connected to the second support frame.

[0011] Furthermore, the electrical connection adapter includes a fifth welding portion and a sixth welding portion connected to the fifth welding portion, and the fifth welding portion and the sixth welding portion are perpendicular to each other.

[0012] Furthermore, the adapter accommodating portion includes a second accommodating portion and a second limiting portion, the second accommodating portion is arranged on the second supporting frame and is recessed inwardly, the second limiting portion is arranged at the bottom end of the second accommodating portion, and a through hole is arranged on the second accommodating portion for the sixth welding portion to pass through.

[0013] Furthermore, the second support frame is provided with a plurality of exhaust holes, and a side provided with the exhaust holes is arranged adjacent to a side provided with the adapter accommodating portion.

[0014] Furthermore, the battery cell assembly further comprises an elastic member, and the elastic member is attached to a large surface of the battery cell on a side away from the battery cell box body.

[0015] The present invention also proposes a battery module, comprising a battery cell assembly as described in any one of the above items, and also comprising a battery cell connecting device, wherein the battery cell assemblies are multiple, and the multiple battery cell assemblies are stacked to form a battery cell stack, and the battery cell connecting device is arranged on the battery cell stack, and the battery cell connecting device is connected to the electrical connection adapter.

[0016] Furthermore, the pole ears are arranged on both sides of the battery cell assembly, and the battery cell connecting device includes a first connecting bracket and a plurality of first bus bars, the first connecting bracket is connected to one side of the pole ears of the battery cell stack, a first through hole is arranged on the first connecting bracket, and the first bus bar is located in the first through hole and connected to the electrical connection adapter.

[0017] Furthermore, the battery cell connection device also includes a first thermal insulation pad corresponding to the first connection bracket, the first thermal insulation pad is provided with a plurality of first cut holes corresponding to the exhaust grooves of the battery cell assembly, and the first connection bracket is provided with a plurality of first air holes corresponding to the first cut holes.

[0018] Furthermore, the cell connection device further includes a first circuit board, and a first terminal disposed on the first connection bracket and connected to the first busbar; the first circuit board is disposed on the first connection bracket and connected to the first busbar and the first terminal, respectively.

[0019] Furthermore, the cell connection device further comprises a terminal protection cover corresponding to the first terminal, and the terminal protection cover is arranged at an end of the first terminal away from the first connection bracket.

[0020] Furthermore, the pole ear is arranged on one side of the battery cell assembly, and the battery cell connecting device includes a second connecting bracket and a plurality of second bus bars, the second connecting bracket is connected to one side of the pole ear of the battery cell stack, a second through hole is arranged on the second connecting bracket, and the second bus bar is located in the second through hole and connected to the electrical connection adapter.

[0021] Furthermore, the battery cell connection device also includes a second thermal insulation pad corresponding to the second connection bracket, the second thermal insulation pad is provided with a plurality of second cut holes corresponding to the exhaust holes of the battery cell assembly, and the second connection bracket is provided with a plurality of second air holes corresponding to the second cut holes.

[0022] Furthermore, the cell connection device also includes a second circuit board, and a second terminal disposed on the second connection bracket and connected to the second busbar, and the second circuit board is disposed on the second connection bracket and connected to the second busbar and the second terminal respectively.

[0023] Furthermore, the battery module also includes a shell assembly, which includes a first end plate and a first side plate, the first end plate is arranged on a side of the battery cell connecting device away from the battery cell stack, the first side plate is arranged on a large surface of the battery cell stack, and the first end plate is arranged adjacent to the first side plate.

[0024] Furthermore, a plurality of first ventilation grooves are provided on the first end plate, and the first ventilation grooves are communicated with the battery cell connecting device.

[0025] Furthermore, the battery module also includes a shell assembly, and the shell assembly includes a second end plate and a second side plate, the second end plate is arranged on a large surface of the battery cell stack, and the second side plate is arranged on a side adjacent to the second end plate.

[0026] Furthermore, a plurality of second ventilation grooves are provided on the second side plate, and the second ventilation grooves are communicated with the battery cell connecting device.

[0027] The present invention also provides a battery pack, comprising any of the battery modules described above.

[0028] Beneficial effects:

[0029] A battery cell assembly of the present invention comprises an electrical connection adapter and a battery cell box; the battery cell box comprises a battery cell box main body and an adapter accommodating portion arranged on the battery cell box main body, the battery cell box main body is used to place battery cells, the electrical connection adapter is arranged in the adapter accommodating portion, the electrical connection adapter is used to connect a battery cell connecting device, and the pole ear of the battery cell is connected to the battery cell connecting device through the electrical connection adapter, so that the pole ear and the battery cell connecting device are connected together through the electrical connection adapter, so that the connection method of the pole ear and the battery cell connecting device is not limited to connection in the vertical direction of the large surface of the battery system bottom plate, and the electrical connection surface of the pole ear and the battery cell connecting device can be kept parallel to the large surface of the battery system bottom plate, so that the connection between the pole ear and the battery cell connecting device reduces the accuracy requirement for vertical alignment, reduces the time and labor required for assembly, thereby reducing production costs, and improving the work efficiency of the assembly process. At the same time, it can reduce the problem of poor contact caused by welding or improper connection caused by vertical connection, improve the reliability of the electrical connection between the pole ear and the battery cell connecting device, and improve the thermal safety protection of the entire module. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 An exploded view of a battery cell assembly according to an embodiment of the present invention;

[0031] Figure 2 A schematic diagram of a battery cell assembly, a battery cell and an elastic member according to an embodiment of the present invention;

[0032] Figure 3 For an embodiment of the present invention Figure 2 A local schematic diagram of the location A;

[0033] Figure 4 It is a schematic diagram of the overall structure of an electrical connection adapter according to an embodiment of the present invention;

[0034] Figure 5 A schematic diagram of the overall structure of an electrical connection adapter according to another embodiment of the present invention;

[0035] Figure 6This is a schematic diagram of the overall structure of a battery module according to an embodiment of the present invention;

[0036] Figure 7 This is a schematic diagram of the overall structure of a battery cell connection device according to an embodiment of the present invention;

[0037] Figure 8 For an embodiment of the present invention Figure 7 A partial schematic diagram of point B;

[0038] Fig. 9 A schematic diagram of a battery cell assembly, a battery cell and an elastic member according to another embodiment of the present invention;

[0039] Fig.10 An exploded view of a battery cell assembly according to another embodiment of the present invention;

[0040] Fig.11 Another embodiment of the present invention Fig.10 A partial schematic diagram of point C;

[0041] Fig.12 A schematic diagram of the overall structure of a battery module according to another embodiment of the present invention;

[0042] Fig.13 This is a schematic diagram of the overall structure of a battery cell connection device according to another embodiment of the present invention;

[0043] Fig.14 Another embodiment of the present invention Fig.13 Local schematic diagram at point D.

[0044] in:

[0045] 1. Battery cell assembly; 2. Battery cell connection device; 3. Shell assembly;

[0046] 10. Electrical connection adapter; 11. Battery box; 12. Battery; 13. Tab; 14. Elastic member;

[0047] 110. battery box body; 111. adapter accommodating portion;

[0048] 1101, first support frame; 1102, first heat conducting sheet; 1103, second support frame; 1104, second heat conducting sheet; 1105, auxiliary fixing member; 1106, auxiliary fixing groove;

[0049] 1110, first accommodating portion; 1111, first limiting portion; 1112, exhaust groove; 1113, second accommodating portion; 1114, second limiting portion; 1115, through hole; 1116, exhaust hole;

[0050] 101, first welding part; 102, second welding part; 103, third welding part; 104, fourth welding part; 105, fifth welding part; 106, sixth welding part; 107, transition part;

[0051] 20. first connection bracket; 21. first busbar; 22. first through hole; 23. first thermal insulation pad; 24. first cut hole; 25. first vent hole; 26. first circuit board; 27. first terminal; 28. terminal protection cover;

[0052] 201, second connecting bracket; 202, second bus bar; 203, second through hole; 204, second thermal insulation pad; 205, second cut hole; 206, second vent hole; 207, second circuit board; 208, second terminal;

[0053] 30. First end plate; 31. First side plate; 32. First ventilation groove; 33. Second end plate; 34. Second side plate; 35. Second ventilation groove.

[0054] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0055] It should be understood that the specific embodiments described herein are only used to explain the present invention, and are not used to limit the present invention.

[0056] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0057] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0058] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0059] Reference Figure 1-Figure 14 , this embodiment provides a battery cell assembly 1, including an electrical connection adapter 10 and a battery cell box 11;

[0060] The battery box 11 includes a battery box body 110 and an adapter accommodating portion 111 arranged on the battery box body 110, the battery box body 110 is used to place the battery cell 12, the electrical connection adapter 10 is arranged in the adapter accommodating portion 111, the electrical connection adapter 10 is used to connect to the battery cell connecting device 2, and the pole ear 13 of the battery cell 12 is connected to the battery cell connecting device 2 through the electrical connection adapter 10.

[0061] In the above embodiment, the battery cell assembly 1 includes an electrical connection adapter 10 and a battery cell box 11, wherein the battery cell box 11 includes a battery cell box body 110, a battery cell 12 compartment for placing the battery cell 12 is arranged in the battery cell box body 110, and the battery cell box body 110 is a structure with an opening on one side, so that the battery cell 12 is placed in the battery cell 12 compartment through the opening, the battery cell box 11 also includes an adapter accommodating portion 111, the adapter accommodating portion 111 is connected to the battery cell box body 110, and the adapter accommodating portion 111 maintains a connected state with the battery cell 12 compartment of the battery cell box body 110, the electrical connection adapter 10 is arranged in the adapter accommodating portion 111, and the electrical connection adapter 10 is mainly used to connect the battery cell connection device 2, wherein the battery cell connection device 2 is a CCS component in the battery system, and when the battery cell box 11 is placed vertically on the large surface of the bottom plate of the battery system, the battery cell 12 in the battery cell box 11 is connected to the battery system The large surface of the battery system bottom plate is kept in a vertical state, the pole ear 13 of the battery cell 12 is connected to the electrical connection adapter 10, and then the pole ear 13 of the battery cell 12 is electrically connected to the battery cell connection device 2 through the electrical connection adapter 10, and the pole ear 13 of the battery cell 12 is connected to the battery cell connection device 2 through the electrical connection adapter 10, so that the connection method between the pole ear 13 and the battery cell connection device 2 is not limited to the connection in the vertical direction of the large surface of the battery system bottom plate, wherein the electrical connection surface of the pole ear 13 and the battery cell connection device 2 is preferably kept parallel to the large surface of the battery system bottom plate, so that the connection between the pole ear 13 and the battery cell connection device 2 reduces the precision requirement for vertical alignment, reduces the time and labor required for assembly, thereby reducing production costs, and improving the work efficiency of the assembly process, and at the same time can reduce the poor contact problem caused by welding or improper connection caused by vertical connection, and improve the reliability of the electrical connection between the pole ear 13 and the battery cell connection device 2.

[0062] Furthermore, the battery cell assembly 1 also includes an elastic member 14. When the battery cell 12 is placed in the battery box body 110, the elastic member 14 is attached to the large surface of the battery cell 12 away from the battery box body 110, wherein the elastic member 14 is preferably an insulating and heat-insulating foam or other insulating and heat-insulating elastic member 14, which effectively prevents accidental short circuits between the battery cell 12 and the battery box body 110 or other components, helps to reduce heat transfer between the battery cell 12 and the battery box 11, and at the same time absorbs and disperses mechanical shock and vibration, protects the battery cell 12 from physical damage, and extends battery life.

[0063] Reference Figure 1-Figure 2 In one embodiment, the battery box body 110 includes a first support frame 1101 and a first heat conductive sheet 1102 , the first support frame 1101 is arranged corresponding to the first heat conductive sheet 1102 , and at least two sides of the first heat conductive sheet 1102 are connected to the first support frame 1101 .

[0064] In the above embodiments, when the main body 110 of the battery cell box is rectangular, the main body 110 of the battery cell box includes a first support frame 1101 and a first heat conducting sheet 1102. The first support frame 1101 is preferably made of plastic, and the first heat conducting sheet 1102 is preferably made of aluminum or copper. The first support frame 1101 and the first heat conducting sheet 1102 are arranged corresponding to each other, so that the first heat conducting sheet 1102 is connected to the first support frame 1101. The connection methods include but are not limited to connection by heat conducting structural adhesive, riveting, clamping, etc. A transfer member accommodating portion 111 is provided at each of the two ends of the first support frame 1101, and the two electrical connection transfer members 10 are respectively placed in the transfer member accommodating portion 111 for connecting the two side electrode tabs 13 of the battery cell 12. The first heat conducting sheet 1102 has a U-shaped structure, so that the two long sides of the first heat conducting sheet 1102 form bent edges, and the first heat conducting sheet 1102 is connected to the first support frame 1101 through the bent edges. In addition, an auxiliary fixing member 1105 is provided at the middle position of the long side at the top of the first support frame 1101, and an auxiliary fixing groove 1106 is provided at the middle position of the top of the first heat conducting sheet 1102. The auxiliary fixing member 1105 and the auxiliary fixing groove 1106 are arranged corresponding to each other, and the auxiliary fixing member 1105 has a cross-shaped structure, so that the parallel portion of the auxiliary fixing member 1105 parallel to the long side of the first support frame 1101 has a certain interval from the first support frame 1101. When the first heat conducting sheet 1102 is connected to the first support frame 1101, the auxiliary fixing member 1105 is in the auxiliary fixing groove 1106, and the parallel portion of the auxiliary fixing member 1105 is attached to the long side at the top of the heat conducting sheet, ensuring that the first heat conducting sheet 1102 is stably and firmly connected to the first support frame 1101. In addition, when the battery system has a top liquid cooling plate, the auxiliary fixing member 1105 can also assist in fixing the liquid cooling plate, effectively improving the stability of the entire main body 110 of the battery cell box.

[0065] Referring to Figure 1-Figure 3 , in an embodiment, the transfer member accommodating portion 111 includes a first accommodating portion 1110 and a first limiting portion 1111. The first accommodating portion 1110 is provided on the first support frame 1101 for placing the electrical connection transfer member 10. The first limiting portion 1111 is provided on the side of the first accommodating portion 1110 away from the first support frame 1101, and a plurality of exhaust grooves 1112 are provided on the first limiting portion 1111.

[0066] In the above embodiment, the adapter accommodating portion 111 includes a first accommodating portion 1110 and a first limiting portion 1111, wherein the first accommodating portion 1110 is arranged on the short side of the first support frame 1101, the first accommodating portion 1110 is used to place the electrical connection adapter 10, and the first accommodating portion 1110 is in a connected state with the first support frame 1101, ensuring that the pole ear 13 of the battery cell 12 can pass through the first support frame 1101 and be placed in the position of the first accommodating portion 1110 to connect with the electrical connection adapter 10, wherein the connection method between the electrical connection adapter 10 and the first accommodating portion 1110 includes but is not limited to gluing, clamping or bolting, the first limiting portion 1111 is arranged on the side of the first accommodating portion 1110 away from the first support frame 1101, and the first limiting portion 1111, the first accommodating portion 1110 and the first support frame 1101 are integrated, which helps to improve the adapter accommodating capacity. The stability of the first accommodating portion 1110 and the first limiting portion 1111 and the first support frame 1101 is ensured, and since the relative positions of the first accommodating portion 1110 and the first limiting portion 1111 and the support frame are fixed, the accurate positioning of the electrical connection adapter 10 during the assembly process is ensured, and in addition, a plurality of exhaust grooves 1112 are arranged on the first limiting portion 1111, and the exhaust grooves 1112 are located on the two side long sides of the first limiting portion 1111, and at the same time, the two opposite exhaust grooves 1112 on the two side long sides are respectively recessed inwards, so that the two opposite exhaust grooves 1112 on the two side long sides are symmetrically arranged, and by connecting the exhaust grooves 1112 with the first accommodating portion 1110 and the first support frame 1101, the battery cell 12 can be directionally erupted through the exhaust grooves 1112 when thermal runaway occurs, which helps to control and guide the gas release, so that the module can be quickly exhausted when thermal runaway occurs, reducing damage to other parts of the battery system.

[0067] Reference Figure 1-Figure 4 In one embodiment, the electrical connection adapter 10 includes a first welding portion 101 and a second welding portion 102 located at the end of the first welding portion 101, the first welding portion 101 is connected to the second welding portion 102 through a transition portion 107, and the transition portion 107 is inclined from the second welding portion 102 to the first welding portion 101.

[0068] In the above embodiment, the electrical connection adapter 10 includes a first welding portion 101 and a second welding portion 102, wherein the second welding portion 102 is arranged at both ends of the first welding portion 101, and the first welding portion 101 is connected to the second welding portion 102 through a transition portion 107, so that the first welding portion 101, the second welding portion 102 and the transition portion are integrated, the first welding portion 101 is located in the first accommodating portion 1110 and is kept perpendicular to the long side of the first support frame 1101, the first welding portion 101 is used to overlap the pole ear 13 of the battery cell 12, and the pole ear 13 is connected to the first welding portion 101 by welding, and the second welding portion 102 is kept parallel to the long side of the first support frame 1101. When the battery cell assembly 1 is placed vertically on the large surface of the bottom plate of the battery system, through the electrical connection The adapter 10 rotates the electrical connection surface of the pole lug 13 from the first welding portion 101 to the second welding portion 102 by 90 degrees, so that the second welding portion 102 is parallel to the large surface of the battery system bottom plate, and the second welding portion 102 includes an upper and lower surface, which helps to increase the current flow area of ​​the electrical connection, so that the fast charging capability of the module can be guaranteed. The bus in the CCS component is electrically connected to the pole lug 13 at the second welding portion 102. At the same time, the transition portion 107 between the first welding portion 101 and the second welding portion 102 is inclined from the second welding portion 102 to the first welding portion 101, so that the surface of the first welding portion 101 and the top of the second welding portion 102 form a height difference, ensuring that the electrical connection adapter 10 can effectively utilize the space inside the limited battery system and reduce interference with other components.

[0069] Reference Figure 1-Figure 3 , Figure 5 In one embodiment, the electrical connection adapter 10 includes a third welding portion 103 and a fourth welding portion 104 connected to the end of the third welding portion 103, and the third welding portion 103 and the fourth welding portion 104 are perpendicular to each other.

[0070] In the above embodiment, the electrical connection adapter 10 includes a third welding portion 103 and a fourth welding portion 104, wherein the fourth welding portion 104 is arranged at both ends of the third welding portion 103, and the third welding portion 103 and the fourth welding portion 104 are integrated, the third welding portion 103 is located in the first accommodating portion 1110 and is perpendicular to the long side of the first support frame 1101, the third welding portion 103 is used to overlap the pole ear 13 of the battery cell 12, and the pole ear 13 is connected to the fourth welding portion 104 by welding, and the fourth welding portion 104 is parallel to the long side of the first support frame 1101. When the battery cell assembly 1 is placed vertically on the large surface of the bottom plate of the battery system, the electrical connection adapter Component 10 rotates the electrical connection surface of the pole lug 13 from the third welding portion 103 by 90 degrees to the fourth welding portion 104, so that the fourth welding portion 104 is parallel to the large surface of the battery system bottom plate, and the fourth welding portion 104 includes an upper and lower surface, which helps to increase the current flow area of ​​the electrical connection, so that the fast charging capability of the module can be guaranteed. The bus in the CCS component is electrically connected to the pole lug 13 at the fourth welding portion 104. At the same time, the third welding portion 103 and the fourth welding portion 104 are perpendicular to each other, so that the entire electrical connection adapter 10 has a U-shaped structure, reducing the connection points between the first welding portion 101 and the second welding portion 102, which helps to reduce the resistance in the electrical connection and improve the electrical performance of the battery system.

[0071] Reference Figure 9-10 In one embodiment, the battery box body 110 includes a second support frame 1103 and a second heat conductive sheet 1104 , the second support frame 1103 is arranged corresponding to the second heat conductive sheet 1104 , and multiple sides of the second heat conductive sheet 1104 are connected to the second support frame 1103 .

[0072] In the above embodiment, when the battery box body 110 is rectangular, the battery box body 110 includes a second support frame 1103 and a second heat conductive sheet 1104, wherein the second support frame 1103 is preferably made of plastic, the second heat conductive sheet 1104 is preferably aluminum or copper, and the second support frame 1103 is arranged corresponding to the second heat conductive sheet 1104, so that the second heat conductive sheet 1104 is connected to the second support frame 1103 through a heat conductive structural adhesive, and two spacers are arranged on the long side of the top of the second support frame 1103. An adapter accommodating portion 111 is arranged at intervals, and two electrical connection adapters 10 are respectively placed in the adapter accommodating portion 111 for connecting the two side pole ears 13 of the battery cell 12. Extended edges extending toward the second support frame 1103 are provided on the short sides of the two sides of the second thermal conductive sheet 1104 and the long side of the bottom. The second support frame 1103 is connected to the second support frame 1103 through the extended edges, ensuring that the second thermal conductive sheet 1104 is stably and firmly connected to the second support frame 1103, thereby effectively improving the stability of the entire battery box body 110.

[0073] Reference Figure 9-11In one embodiment, the electrical connection adapter 10 includes a fifth welding portion 105 and a sixth welding portion 106 connected to the fifth welding portion 105, and the fifth welding portion 105 and the sixth welding portion 106 are perpendicular to each other.

[0074] In the above embodiment, the electrical connection adapter 10 includes a fifth welding portion 105 and a sixth welding portion 106, and the sixth welding portion 106 is connected to the fifth welding portion 105 to form an integral part, the fifth welding portion 105 is located in the adapter accommodating portion 111 and is parallel to the long side of the second support frame 1103, the sixth welding portion 106 is used to overlap the pole ear 13 of the battery cell 12, and the pole ear 13 is connected to the sixth welding portion 106 by welding, and the sixth welding portion 106 is perpendicular to the long side of the second support frame 1103. When the battery cell assembly 1 is placed vertically on the large surface of the bottom plate of the battery system, the pole ear 1 is connected by the electrical connection adapter 10. The electrical connection surface of 3 is rotated 90 degrees from the sixth welding portion 106 to the fifth welding portion 105, so that the fifth welding portion 105 is parallel to the large surface of the battery system bottom plate. The fifth welding portion 105 is relatively long, and the current flow area of ​​the electrical connection is large enough to ensure the fast charging capability of the module. The bus in the CCS assembly is electrically connected to the pole ear 13 at the fifth welding portion 105. At the same time, the fifth welding portion 105 and the sixth welding portion 106 are perpendicular to each other, so that the entire electrical connection adapter 10 is an L-shaped structure, reducing the connection points between the fifth welding portion 105 and the sixth welding portion 106, which helps to reduce the resistance in the electrical connection and improve the electrical performance of the battery system.

[0075] Reference Figure 9-11 In one embodiment, the adapter accommodating portion 111 includes a second accommodating portion 1113 and a second limiting portion 1114, the second accommodating portion 1113 is arranged on the second support frame 1103 and is recessed inwardly, the second limiting portion 1114 is arranged at the bottom end of the second accommodating portion 1113, and a through hole 1115 is arranged on the second accommodating portion 1113 for the sixth welding portion 106 to pass through.

[0076] In the above embodiment, the adapter accommodating portion 111 includes a second accommodating portion 1113 and a second limiting portion 1114, the second accommodating portion 1113 is arranged on the top long side of the second support frame 1103, and the second accommodating portion 1113 is recessed into the second support frame 1103, the second accommodating portion 1113 is used to place the fifth welding portion 105, the second limiting portion 1114 is arranged at the bottom end of the second accommodating portion 1113, and the second limiting portion 1114 is located inside the second support frame 1103, and the second limiting portion 1114 extends in the length direction of the top long side of the second support frame 1103, and a through hole 1115 for the sixth welding portion 106 to pass through is provided on the second accommodating portion 1113, wherein the through hole 1115 is located The second accommodating portion 1113 is close to one side of the second heat conducting plate 1104, so that the second accommodating portion 1113 and the first support frame 1101 are in a connected state, ensuring that the electrical connection adapter 10 passes through the second support frame 1103 and is connected to the pole ear 13, wherein the connection method between the electrical connection adapter 10 and the first accommodating portion 1110 includes but is not limited to gluing, clamping or bolting, and the second limiting portion 1114, the second accommodating portion 1113 and the second support frame 1103 are an integrated part, which helps to improve the stability of the adapter accommodating portion 111 and the second support frame 1103, and because the relative positions of the second accommodating portion 1113 and the second limiting portion 1114 and the support frame are fixed, the precise positioning of the electrical connection adapter 10 during the assembly process is ensured.

[0077] Furthermore, a plurality of exhaust holes 1116 are provided on the second support frame 1103, wherein the exhaust holes 1116 are located on both short sides of the second support frame 1103, and the exhaust holes 1116 on both short sides are symmetrically arranged so that the side provided with the exhaust holes 1116 is adjacent to the side provided with the adapter accommodating portion 111, and the exhaust holes 1116 are preferably located at one end of the short side close to the top long side, and by connecting the exhaust holes 1116 with the second support frame 1103, the battery cell 12 can be directionally ejected through the exhaust holes 1116 when thermal runaway occurs, which helps to control and guide the gas release, so that the module can be quickly exhausted when thermal runaway occurs, thereby reducing damage to other parts of the battery system.

[0078] Reference Figure 1-Figure 14 This embodiment provides a battery module, including the battery cell assembly 1 described in any one of the above embodiments, and also includes a battery cell connecting device 2, the battery cell assembly 1 is multiple, and the multiple battery cell assemblies 1 are stacked to form a battery cell stack, the battery cell connecting device 2 is arranged on the battery cell stack, and the battery cell connecting device 2 is connected to the electrical connection adapter 10.

[0079] In the above embodiment, the battery module includes a battery cell assembly 1 and also includes a battery cell connecting device 2, wherein there are multiple battery cell assemblies 1, and the multiple battery cell assemblies 1 are stacked to form a battery cell stack, and the battery cell connecting device 2 is fixedly connected to a side of the battery cell stack where a pole ear 13 is provided, and the battery cell connecting device 2 is connected to an electrical connection adapter 10, so that the battery cell connecting device 2 is connected to the pole ear 13 through the electrical connection adapter 10, and the battery cell connecting device 2 is installed on the battery cell stack. The connection between the electrical connection adapter 10 and the pole ear 13 simplifies the electrical connection process, avoids complex wiring, and makes the electrical connection more reliable and efficient. At the same time, it avoids the battery cell connecting device 2 being directly connected to the pole ear 13 in the vertical direction of the large surface of the battery system bottom plate, reducing the operation difficulty and time during the assembly process, and the shell assembly 3 can provide additional protection to prevent the battery cell 12 from short circuiting or thermal runaway when it is impacted or punctured.

[0080] Reference Figure 6-Figure 7 In one embodiment, the pole ear 13 is arranged on both sides of the battery cell assembly 1, and the battery cell connecting device 2 includes a first connecting bracket 20 and a plurality of first bus bars 21, the first connecting bracket 20 is connected to one side of the pole ear 13 of the battery cell stack, and a first through hole 22 is provided on the first connecting bracket 20, and the first bus bar 21 is located in the first through hole 22 and connected to the electrical connection adapter 10.

[0081] In the above embodiment, the pole ears are arranged on both sides of the battery cell assembly 1, that is, the battery cell assembly 1 has double-sided pole ears 13, and the battery cell connecting device 2 includes a first connecting bracket 20 and a plurality of first bus bars 21, wherein the first connecting bracket 20 is connected to one side of the pole ear 13 of the battery cell stack, and the long sides of the first connecting bracket 20 are bent toward the battery cell stack to form a bending portion, and the bending portion extends along the entire length direction of the long side of the first connecting bracket 20, so that the first connecting bracket 20 is preferably a U-shaped structure, and the first connecting bracket 20 is connected to the adapter accommodating portion 111 of the battery cell assembly 1 through the bending portion. In addition, a plurality of first through holes 22 are respectively arranged on the long sides of the first connecting bracket 20, and the plurality of first through holes 22 are arranged at intervals, and the first bus bar 21 is located in the first through hole 22, so that the first bus bar 21 can be directly connected to the electrical connection adapter 10, thereby completing the electrical connection between the first bus bar 21 and the battery cell 12, effectively simplifying the connection steps and improving the connection efficiency.

[0082] Reference Figure 6-Figure 8 In one embodiment, the battery cell connecting device 2 also includes a first thermal insulation pad 23 corresponding to the first connecting bracket 20, and the first thermal insulation pad 23 is provided with a plurality of first cut holes 24 corresponding to the exhaust groove 1112 of the battery cell assembly 1, and the first connecting bracket 20 is provided with a plurality of first air holes 25 corresponding to the first cut holes 24.

[0083] In the above embodiment, the battery cell connection device 2 also includes a first thermal insulation pad 23, wherein the first thermal insulation pad 23 corresponds to the first connection bracket 20, and the first thermal insulation pad 23 is located on the side of the battery cell stack body provided with the pole ear 13, so that the first thermal insulation pad 23 is located between the first connection bracket 20 and the battery cell stack body, ensuring that the first thermal insulation pad 23 is tightly fitted with the first connection bracket 20 and the battery cell stack body respectively, and in addition, after a plurality of battery cell assemblies 1 are stacked to form a battery cell stack body, the exhaust grooves 1112 of adjacent battery cell assemblies 1 are mutually combined to form an exhaust channel, and then a plurality of first cut holes 24 are provided on the first thermal insulation pad 23, and The first cutout 24 is preferably I-shaped, so that the first cutout 24 is arranged corresponding to the exhaust channel. At the same time, a plurality of first air holes 25 are provided on the first connecting bracket 20, and the first air holes 25 correspond to the first cutout 24, so that the exhaust channel, the first cutout 24 and the first air holes 25 are in a connected state. The gas generated when the battery cell 12 has thermal runaway can be discharged in a direction through the exhaust channel, the first cutout 24 and the first air holes 25, so that the battery cell 12 can be exhausted smoothly without affecting the adjacent battery cells 12, thereby improving the thermal safety protection of the module and reducing the impact on other parts inside the battery module.

[0084] Reference Figure 6-Figure 7 In one embodiment, the battery cell connection device 2 also includes a first circuit board 26, and a first terminal 27 arranged on the first connection bracket 20 and connected to the first bus 21. The first circuit board 26 is arranged on the first connection bracket 20 and is respectively connected to the first bus 21 and the first terminal 27.

[0085] In the above embodiment, the battery cell connection device 2 also includes a first circuit board 26 and a first terminal 27. A terminal connection hole is provided at the end of the bending portion of the first connection bracket 20. The first terminal 27 is preferably a U-shaped structure, and there are two first terminals 27. The first terminal 27 at one end of the first bus 21 is a positive terminal, and the first terminal 27 at the other end of the first bus 21 is a negative terminal. The end of the first terminal 27 is located in the terminal connection hole of the first connection bracket 20, so that the first terminal 27 is connected to the first bus 21. When the end of the first terminal 27 is located in the terminal connection hole, the end of the first terminal 27 is located in the same plane as the first connection bracket 20, providing stable mechanical support to ensure that the connection with the first bus 21 is firm and reliable. In addition, the first circuit board 26 is arranged on the first connection bracket 20 away from the On one side of the first thermal insulation pad 23, the first circuit board 26 is preferably a flexible printed circuit board, so that the first circuit board 26 is arranged on the first connecting bracket 20 and connected to the first bus 21, and the first circuit board 26 is also connected to the first terminal 27, so that the first circuit board 26 can adapt to different installation angles and shapes, thereby improving the flexibility of the design. In addition, the battery cell connection device 2 also includes a terminal protection cover 28, and the terminal protection cover 28 is arranged at one end of the first terminal 27 away from the first connecting bracket 20, wherein the terminal protection cover 28 is arranged corresponding to the first terminal 27, so that the terminal protection cover 28 covers the first terminal 27, effectively protecting the first terminal 27 from physical damage, and during maintenance or operation, the terminal protection cover 28 can prevent accidental touching of the charged first terminal 27, thereby improving the safety of operation.

[0086] Reference Fig. 9 , Figure 12-13 In one embodiment, the pole ear 13 is arranged on one side of the battery cell assembly 1, and the battery cell connecting device 2 includes a second connecting bracket 201 and a plurality of second bus bars 202, the second connecting bracket 201 is connected to one side of the pole ear 13 of the battery cell stack, and a second through hole 203 is provided on the second connecting bracket 201, and the second bus bar 202 is located in the second through hole 203 and connected to the electrical connection adapter 10.

[0087] In the above embodiments, the tabs 13 are disposed on both sides of the battery cell assembly 1, that is, the battery cell assembly 1 has tabs 13 on one side only. The battery cell connection device 2 includes a second connection bracket 201 and a plurality of second busbars 202. The second connection bracket 201 is connected to the side of the tabs 13 of the battery cell stack, and the short sides on both sides of the second connection bracket 201 are bent toward the battery cell stack to form bent portions, and the bent portions extend along the entire length direction of the long side of the second connection bracket 201, so that the second connection bracket 201 is preferably in a C-shaped structure. The second connection bracket 201 is connected to the battery cell stack of the battery cell assembly 1 through the bent portions. In addition, a plurality of second through holes 203 are provided on the second connection bracket 201, and the plurality of second through holes 203 are arranged in an array. The second busbars 202 are located in the second through holes 203, so that the second busbars 202 can be directly connected to the electrical connection adapter 10, thereby completing the electrical connection between the second busbars 202 and the battery cells 12, effectively simplifying the connection steps and improving the connection efficiency.

[0088] Referring to Figure 12-14 , in one embodiment, the battery cell connection device 2 further includes a second heat insulation pad 204 corresponding to the second connection bracket 201. A plurality of second cut holes 205 corresponding to the exhaust holes 1116 of the battery cell assembly 1 are provided on the second heat insulation pad 204, and a plurality of second ventilation holes 206 corresponding to the second cut holes 205 are provided on the second connection bracket 201.

[0089] In the above embodiments, the battery cell connection device 2 further includes a second heat insulation pad 204. The second heat insulation pad 204 corresponds to the bent portion of the second connection bracket 201, and the second heat insulation pad 204 is located on the short side of the second connection bracket 201, so that the second heat insulation pad 204 is located between the second connection bracket 201 and the battery cell stack, ensuring close fitting of the second heat insulation pad 204 to the second connection bracket 201 and the battery cell stack respectively. In addition, after a plurality of battery cell assemblies 1 are stacked to form a battery cell stack, a plurality of second cut holes 205 are provided on the first heat insulation pad 23, and the second cut holes 205 are preferably in an I-shaped structure, so that the second cut holes 205 are arranged corresponding to the exhaust holes 1116. At the same time, a plurality of second ventilation holes 206 are provided on the second connection bracket 201, and the second ventilation holes 206 correspond to the second cut holes 205. Furthermore, the exhaust holes 1116, the second cut holes 205, and the second ventilation holes 206 are in a communicating state. The gas generated when the battery cell 12 undergoes thermal runaway can be discharged in a directional manner through the exhaust holes 1116, the second cut holes 205, and the second ventilation holes 206, enabling the battery cell 12 to exhaust smoothly without affecting the adjacent battery cells 12, improving the thermal safety protection of the module and reducing the impact on other parts inside the battery module.

[0090] Referring to Figure 12-13In one embodiment, the battery cell connection device 2 also includes a second circuit board 207, and a second terminal 208 arranged on the second connection bracket 201 and connected to the second bus 202. The second circuit board 207 is arranged on the second connection bracket 201 and connected to the second bus 202 and the second terminal 208 respectively.

[0091] In the above embodiment, the battery cell connection device 2 also includes a second circuit board 207 and a second terminal 208. A terminal connection hole is provided at the edge of the second connection bracket 201. The second terminal 208 is preferably a T-shaped structure. A portion of the second terminal 208 is located in the terminal connection hole of the second connection bracket 201, so that the second terminal 208 is connected to the second bus 202, and there are two second terminals 208. The second terminal 208 on one side of the second bus 202 is a positive terminal, and the second terminal 208 on the other side of the second bus 202 is a negative terminal, and a portion of the second terminal 208 is located in the terminal connection hole. When inside, the end of the second terminal 208 is located in the same plane as the second connecting bracket 201, providing stable mechanical support to ensure that the connection with the second bus 202 is firm and reliable. In addition, the second circuit board 207 is arranged on the side of the second connecting bracket 201 away from the battery cell stack, wherein the second circuit board 207 is preferably a flexible printed circuit board, so that the second circuit board 207 is arranged on the second connecting bracket 201 and connected to the second bus 202, and the second circuit board 207 is also connected to the second terminal 208, so that the second circuit board 207 can adapt to different installation angles and shapes, thereby improving the flexibility of design.

[0092] Reference Figure 6-Figure 7 In one embodiment, the battery module also includes a shell assembly 3, the shell assembly 3 includes a first end plate 30 and a first side plate 31, the first end plate 30 is arranged on the side of the battery cell connecting device 2 away from the battery cell stack, the first side plate 31 is arranged on the large surface of the battery cell stack, and the first end plate 30 is arranged adjacent to the first side plate 31.

[0093] In the above embodiment, the battery module also includes a shell assembly 3, which includes a first end plate 30 and a first side plate 31, wherein the first end plate 30 is arranged on the battery cell stack, and the first end plate 30 is located on the side of the battery cell connecting device 2 away from the battery cell stack, so that the first end plate 30 is fixedly connected to the battery cell connecting device 2 at both ends of the pole ear 13 of the battery cell stack, and the first side plate 31 is arranged on the large surface of the battery cell 12 in the battery cell stack, so that the first end plate 30 and the first side plate 31 are arranged adjacent to each other, and the first end plate 30 and the first side plate 31 are respectively connected to the battery cell stack in a manner preferably by welding, or by bolting, so that the top and bottom of the battery cell stack do not need an upper cover and a bottom shell, and during assembly, the thermal conductive structural glue is directly used to connect the battery cell stack. It is connected to the upper and lower liquid-cooling components of the battery system, and the shell assembly 3 can protect the battery cell stack and the battery cell connecting device 2 from external impact, vibration or other physical damage. Omitting the upper cover and the bottom shell can reduce the assembly steps, and directly use the thermal conductive structural adhesive to connect with the liquid cooling components, which simplifies the assembly process. In addition, a plurality of first ventilation grooves 32 are arranged on the first end plate 30, and the first ventilation grooves 32 are connected to the battery cell connecting device 2, so that the first ventilation grooves 32 and the exhaust grooves 1112 of the battery cell assembly 1 are also in a connected state, so that when the battery cell 12 has thermal runaway, the first ventilation grooves 32 guide the gas generated during thermal runaway to be discharged along a predetermined path, thereby reducing damage to other parts of the battery module and preventing the battery module from rupture due to excessive internal pressure.

[0094] Reference Figure 10-13 In one embodiment, the battery module also includes a shell assembly 3, and the shell assembly 3 includes a second end plate 33 and a second side plate 34, the second end plate 33 is arranged on the large surface of the battery cell stack, and the second side plate 34 is arranged on a side adjacent to the second end plate 33.

[0095] In the above embodiment, the battery module also includes a shell assembly 3, and the shell assembly 3 includes a second end plate 33 and a second side plate 34, wherein the second end plate 33 is arranged on the large surface of the battery cell 12 in the battery cell stack, and the second side plate 34 is arranged on the side where the exhaust hole 1116 is arranged in the battery cell connecting device 2, that is, the second end plate 33 and the second side plate 34 are arranged adjacent to each other, and the second end plate 33 and the second side plate 34 are respectively connected to the battery cell stack in a manner preferably by welding, or by bolt connection, so that the top and bottom of the battery cell stack do not need an upper cover and a bottom shell, and are directly connected to the upper and lower liquid cooling components of the battery system through a heat-conducting structural adhesive during assembly, and the shell assembly 3 can protect the battery. The core stack and the cell connecting device 2 are protected from external impact, vibration or other physical damage. Omitting the upper cover and the bottom shell can reduce the assembly steps. The liquid cooling components are directly connected using a thermally conductive structural adhesive, which simplifies the assembly process. In addition, a plurality of second ventilation grooves 35 are provided on the second side plate 34, and the second ventilation grooves 35 are connected to the cell connecting device 2, so that the second ventilation grooves 35 and the exhaust holes 1116 of the cell assembly 1 are also connected. When thermal runaway occurs in the cell 12, the second ventilation grooves 35 guide the gas generated during the thermal runaway to be discharged along a predetermined path, thereby reducing damage to other parts of the battery module and preventing the battery module from rupture due to excessive internal pressure.

[0096] This embodiment provides a battery pack, comprising the battery module described in any one of the above embodiments.

[0097] In the above embodiment, the battery pack includes a battery module, and the battery cell connecting device 2 is connected to the battery cell 12 through the electrical connection adapter 10, which effectively reduces the complexity of the battery module during assembly, reduces the possibility of assembly errors, and improves overall production efficiency.

[0098] The above description is only a preferred embodiment of the present invention, and does not limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made by using the contents of the present invention specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A battery cell assembly, characterized in that: Including an electrical connection adapter and a battery box; The battery cell box includes a battery cell box body and an adapter accommodating portion arranged on the battery cell box body, the battery cell box body is used to place the battery cell, the electrical connection adapter is arranged in the adapter accommodating portion, the electrical connection adapter is used to connect the battery cell connecting device, and the electrode tab of the battery cell is connected to the battery cell connecting device through the electrical connection adapter.

2. The battery cell assembly according to claim 1, characterized in that: The battery box body includes a first support frame and a first heat conducting sheet. The first support frame is arranged corresponding to the first heat conducting sheet, and at least two sides of the first heat conducting sheet are connected to the first support frame.

3. The battery cell assembly according to claim 2, characterized in that: The adapter accommodating portion includes a first accommodating portion and a first limiting portion. The first accommodating portion is arranged on the first supporting frame for placing the electrical connection adapter. The first limiting portion is arranged on a side of the first accommodating portion away from the first supporting frame, and a plurality of exhaust grooves are arranged on the first limiting portion.

4. The battery cell assembly according to claim 2, characterized in that: The electrical connection adapter includes a first welding portion and a second welding portion located at the end of the first welding portion. The first welding portion is connected to the second welding portion through a transition portion, and the transition portion is inclined from the second welding portion to the first welding portion.

5. The battery cell assembly according to claim 2, characterized in that: The electrical connection adapter includes a third welding portion and a fourth welding portion connected to an end of the third welding portion, and the third welding portion and the fourth welding portion are perpendicular to each other.

6. The battery core assembly according to claim 1, characterized in that: The battery box body includes a second support frame and a second heat conducting sheet. The second support frame is arranged corresponding to the second heat conducting sheet, and a plurality of side edges of the second heat conducting sheet are connected to the second support frame.

7. The battery cell assembly according to claim 6, characterized in that: The electrical connection adapter includes a fifth welding portion and a sixth welding portion connected to the fifth welding portion, and the fifth welding portion and the sixth welding portion are perpendicular to each other.

8. The battery cell assembly according to claim 7, characterized in that: The adapter accommodating portion includes a second accommodating portion and a second limiting portion, the second accommodating portion is arranged on the second supporting frame and is recessed inwardly, the second limiting portion is arranged at the bottom end of the second accommodating portion, and a through hole is arranged on the second accommodating portion for the sixth welding portion to pass through.

9. The battery core assembly according to claim 6, characterized in that: The second support frame is provided with a plurality of exhaust holes, and a side provided with the exhaust holes is arranged adjacent to a side provided with the adapter accommodating portion.

10. The battery core assembly according to claim 1, characterized in that: The battery cell assembly further comprises an elastic member, and the elastic member is attached to a large surface of the battery cell away from the battery cell box body.

11. A battery module, characterized in that: It comprises the battery cell assembly according to any one of claims 1 to 10, and also comprises a battery cell connecting device, the battery cell assembly is multiple, the multiple battery cell assemblies are stacked to form a battery cell stack, the battery cell connecting device is arranged on the battery cell stack, and the battery cell connecting device is connected to the electrical connection adapter.

12. The battery module according to claim 11, characterized in that: The pole ears are arranged on both sides of the battery cell assembly, and the battery cell connecting device includes a first connecting bracket and a plurality of first bus bars, the first connecting bracket is connected to one side of the pole ears of the battery cell stack, and a first through hole is arranged on the first connecting bracket, and the first bus bar is located in the first through hole and connected to the electrical connection adapter.

13. The battery module according to claim 12, characterized in that: The battery cell connection device also includes a first thermal insulation pad corresponding to the first connection bracket, the first thermal insulation pad is provided with a plurality of first cut holes corresponding to the exhaust grooves of the battery cell assembly, and the first connection bracket is provided with a plurality of first ventilation holes corresponding to the first cut holes.

14. The battery module according to claim 12, characterized in that: The cell connection device further includes a first circuit board and a first terminal disposed on the first connection bracket and connected to the first busbar. The first circuit board is disposed on the first connection bracket and connected to the first busbar and the first terminal, respectively.

15. The battery module according to claim 14, characterized in that: The cell connection device further includes a terminal protection cover corresponding to the first terminal, and the terminal protection cover is disposed at an end of the first terminal away from the first connection bracket.

16. The battery module according to claim 11, characterized in that: The pole ear is arranged on one side of the battery cell assembly, and the battery cell connecting device includes a second connecting bracket and a plurality of second bus bars, the second connecting bracket is connected to one side of the pole ear of the battery cell stack, a second through hole is arranged on the second connecting bracket, and the second bus bar is located in the second through hole and connected to the electrical connection adapter.

17. The battery module according to claim 16, characterized in that: The battery cell connection device also includes a second thermal insulation pad corresponding to the second connection bracket, the second thermal insulation pad is provided with a plurality of second cut holes corresponding to the exhaust holes of the battery cell assembly, and the second connection bracket is provided with a plurality of second ventilation holes corresponding to the second cut holes.

18. The battery module according to claim 17, characterized in that: The cell connection device further includes a second circuit board and a second terminal disposed on the second connection bracket and connected to the second busbar. The second circuit board is disposed on the second connection bracket and connected to the second busbar and the second terminal respectively.

19. The battery module according to any one of claims 12 to 15, characterized in that: The battery module also includes a shell assembly, which includes a first end plate and a first side plate, wherein the first end plate is arranged on a side of the battery cell connecting device away from the battery cell stack, the first side plate is arranged on a large surface of the battery cell stack, and the first end plate is arranged adjacent to the first side plate.

20. The battery module according to claim 19, characterized in that: A plurality of first ventilation grooves are arranged on the first end plate, and the first ventilation grooves are communicated with the battery core connecting device.

21. The battery module according to any one of claims 16 to 18, characterized in that: The battery module further includes a shell assembly, which includes a second end plate and a second side plate, wherein the second end plate is arranged on a large surface of the battery cell stack, and the second side plate is arranged on a side adjacent to the second end plate.

22. The battery module according to claim 21, characterized in that: A plurality of second ventilation grooves are arranged on the second side plate, and the second ventilation grooves are communicated with the battery core connecting device.

23. A battery pack, characterized in that: A battery module comprising any one of claims 11-22.

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