Battery assembly, battery pack and vehicle

Abstract

The invention relates to a battery assembly, a battery pack and a vehicle. The battery assembly comprises a battery cell, and the battery cell comprises a pole, an anti-explosion valve, and a first end face and a second end face which are oppositely arranged along the length direction. The first end face and the second end face are both provided with poles. The pole columns comprise a positive pole column and a negative pole column. The anti-explosion valve is arranged on the first end face. Wherein a plurality of battery cells are arranged. The first end faces of the plurality of battery cells are located on the same side of the battery assembly, and the adjacent battery cells are electrically connected. According to the structural arrangement of the battery assembly, when the battery cell is overpressure or overheated, the anti-explosion valves need to be opened and the internal pressure of the battery cell is released, the internal heat of the battery cell can be intensively released through the first end face, so that the situation that the anti-explosion valves of different battery assemblies spray oppositely is avoided, the risk of thermal runaway spreading is effectively reduced, and the battery assembly is more stable in performance. And the thermal management system of the battery pack is optimized, so that the overall stability and safety of the battery pack and the vehicle are improved.

Description

Technical Field

[0001] This application relates to the field of batteries, and in particular, to a battery assembly, a battery pack, and a vehicle. Background Art

[0002] The explosion-proof valve of the battery cell is an important safety device in the battery assembly, mainly used to prevent catastrophic explosions or damages caused by overvoltage or overheating of the battery under abnormal conditions. When the internal pressure of the battery cell reaches a dangerous level, the explosion-proof valve can allow gas to be quickly discharged, thereby preventing the battery cell casing from bursting or exploding due to overpressure. In the existing battery assemblies, multiple battery cells are arranged alternately, and the explosion-proof valves are respectively arranged on both sides of the battery assembly. Therefore, once the battery experiences overvoltage or overheating, the explosion-proof valves of two battery assemblies may spray against each other, thus posing a risk of thermal runaway spreading and endangering the safety of the battery pack. Summary of the Invention

[0003] This application provides a battery assembly, a battery pack, and a vehicle to solve some or all of the deficiencies in the related art.

[0004] This application provides a battery assembly, including battery cells. Each battery cell includes a pole column, an explosion-proof valve, and a first end face and a second end face that are oppositely arranged along the length direction. The first end face and the second end face are both provided with the pole column. The pole column includes a positive pole column and a negative pole column. The explosion-proof valve is arranged on the first end face.

[0005] Wherein, the number of the battery cells is multiple. The first end faces of the multiple battery cells are all located on the same side of the battery assembly, and adjacent battery cells are electrically connected.

[0006] Optionally, on the first end face, the pole columns and the explosion-proof valves of the battery cells are distributed along the height direction of the battery assembly. Two adjacent battery cells are referred to as the first battery cell and the second battery cell.

[0007] Along the height direction, the explosion-proof valve of the first battery cell is arranged closer to the upper end of the first end face compared to the pole column, and the explosion-proof valve of the second battery cell is arranged closer to the lower end of the first end face compared to the pole column. The polarities of the pole columns of the first battery cell and the second battery cell that are arranged closer to the explosion-proof valve are the same. The length direction is different from the height direction.

[0008] Optionally, the battery assembly further includes a first connecting member, which includes a first connecting portion, a second connecting portion, and a bending portion. The first connecting portion and the second connecting portion are respectively connected to two ends of the bending portion. Among them, both the first connecting portion and the second connecting portion extend in the height direction, and the bending portion extends in the connection direction of the battery cells. The connection direction is different from the height direction. The first connecting portion and the second connecting portion are respectively electrically connected to the poles with different polarities of the first battery cell and the second battery cell.

[0009] Optionally, the first connecting portion is connected to the pole of the battery cell disposed near the explosion-proof valve, and the second connecting portion is connected to the pole of the battery cell disposed far from the explosion-proof valve.

[0010] Among them, the outer edge of the first connecting portion on the side close to the explosion-proof valve is set as an arc edge; and / or, the outer edge of the second connecting portion on the side close to the explosion-proof valve is set as a right-angle edge.

[0011] Optionally, on the first end face, the poles and the explosion-proof valves of the battery cells are distributed along the height direction of the battery assembly. Two adjacent battery cells are referred to as the first battery cell and the second battery cell.

[0012] Along the height direction, the explosion-proof valves of the first battery cell and the second battery cell are both disposed closer to the lower end of the first end face compared to the poles. The poles of the first battery cell disposed near the explosion-proof valve and the poles of the second battery cell disposed near the explosion-proof valve have different polarities. The length direction is different from the height direction.

[0013] Optionally, the battery assembly further includes a second connecting member, which includes a third connecting portion and a fourth connecting portion. The third connecting portion and the fourth connecting portion are distributed along the connection direction of the battery cells, and the connection direction is different from the height direction. The third connecting portion and the fourth connecting portion are respectively electrically connected to the poles with different polarities of the first battery cell and the second battery cell.

[0014] Optionally, the second connecting member further includes a deformation portion disposed between the third connecting portion and the fourth connecting portion. After the third connecting portion and the fourth connecting portion are respectively electrically connected to the poles with different polarities of the first battery cell and the second battery cell, the deformation portion is located between the first battery cell and the second battery cell.

[0015] Optionally, the deformation portion includes a first side wall, a second side wall, and a groove formed by the first side wall and the second side wall; the first side wall is connected to the third connecting portion, and the second side wall is connected to the fourth connecting portion.

[0016] The present application also provides a battery pack, including the battery assembly described above.

[0017] In addition, the present application also provides a vehicle, including the battery pack described above.

[0018] The technical solutions provided by the embodiments of the present application may include the following beneficial effects:

[0019] As can be seen from the above embodiments, the battery assembly of the present application integrates multiple battery cells, and adjacent battery cells are electrically connected, so that the space utilization rate inside the battery pack is higher, thereby effectively improving the energy density of the battery pack. In addition, when the battery cell experiences overvoltage or overheating, the explosion-proof valve needs to open and release the internal pressure of the battery cell, and the structural arrangement of the battery assembly enables the internal heat of the battery cell to be concentratedly released through the first end face, thus avoiding the situation of the explosion-proof valves of different battery assemblies spraying against each other, effectively reducing the risk of thermal runaway spread, optimizing the thermal management system of the battery pack, and thereby improving the overall stability and safety of the battery pack and the vehicle. Moreover, for the battery assembly of the present application, only the battery cells with the same structure need to be installed in different placement directions to achieve the effect of making all the explosion-proof valves face the same side, effectively simplifying the production and installation processes of the battery assembly.

[0020] It should be understood that the above general description and the following detailed description are only exemplary and explanatory, and cannot limit the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the following drawings are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0022] Figure 1 It is a schematic diagram of the overall structure of the battery assembly in an embodiment of the present application;

[0023] Figure 2 For Figure 1 an enlarged view of part A in

[0024] Figure 3 It is a schematic diagram of the structure of the first end face of the battery cell in an embodiment of the present application;

[0025] Figure 4 It is a schematic diagram of the structure of the second end face of the battery cell in an embodiment of the present application;

[0026] Figure 5 It is an assembly schematic diagram of the battery assembly near the first end face in an embodiment of the present application;

[0027] Figure 6 Structural schematic diagram of the first connecting member in an embodiment of the present application;

[0028] Figure 7 Assembly schematic diagram of the battery assembly near one side of the second end face in an embodiment of the present application;

[0029] Figure 8 Assembly schematic diagram of another battery assembly near one side of the first end face in an embodiment of the present application;

[0030] Figure 9 Structural schematic diagram of the second connecting member in an embodiment of the present application;

[0031] Figure 10 Assembly schematic diagram of another battery assembly near one side of the second end face in an embodiment of the present application.

[0032] Explanation of reference numerals:

[0033] 1. Battery assembly; 11. Battery cell; 11a. First end face; 11b. Second end face; 111. Terminal; 111a. Positive terminal; 111b. Negative terminal; 112. Explosion-proof valve; 113. Liquid injection hole; 114. First battery cell; 115. Second battery cell; 12. First connecting member; 121. First connecting portion; 1211. Arc edge; 122. Second connecting portion; 1221. Right-angle edge; 123. Bending portion; 13. Second connecting member; 131. Third connecting portion; 132. Fourth connecting portion; 133. Deformation portion; 1331. First side wall; 1332. Second side wall; 1333. Groove; X. Length direction; Y. Connection direction; Z. Height direction. Detailed implementation manners

[0034] Here, the technical solutions in the embodiments (or "implementation manners") of the present application will be clearly and completely described in conjunction with the accompanying drawings. When the following description refers to the accompanying drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements.

[0035] If there are terms related to directional indications or positional relationships in the embodiments of the present application (such as up, down, left, right, front, back, inside, outside, top, bottom, center, vertical, horizontal, longitudinal, lateral, length, width, counterclockwise, clockwise, axial, radial, circumferential, etc.), such terms are only used to explain the relative positional relationships and movement conditions between components in a specific posture (as shown in the accompanying drawings); if this specific posture changes, then the directional indication or positional relationship will also change accordingly. In addition, the terms "first", "second", etc. involved in the embodiments of the present application are only for the purpose of convenient description and cannot be understood as indicating or implying relative importance.

[0036] The present application provides a vehicle, including a battery pack. During the operation of the vehicle, the battery pack provides a power source for the operation of the vehicle and supplies power to various electronic modules of the vehicle.

[0037] The battery pack of the present application includes battery assembly 1. Battery assembly 1 is responsible for directly storing and releasing electrical energy. A plurality of battery assemblies 1 are assembled in the battery pack, and the plurality of battery assemblies 1 form a complete integrated battery system through combination, so as to provide a power source for the operation of the vehicle and supply power to various electronic modules of the vehicle during the operation of the vehicle.

[0038] Battery assembly 1 of the present application includes battery cells 11. Each battery cell 11 includes a terminal 111, an explosion-proof valve 112, and a first end face 11a and a second end face 11b oppositely arranged along the length direction X. Both the first end face 11a and the second end face 11b are provided with terminals 111. The terminal 111 includes a positive terminal 111a and a negative terminal 111b. The explosion-proof valve 112 is arranged on the first end face 11a.

[0039] Wherein, the number of battery cells 11 is multiple. The first end faces 11a of the multiple battery cells 11 are all located on the same side of battery assembly 1, and adjacent battery cells 11 are electrically connected.

[0040] As Figure 1 and Figure 2 shown, battery assembly 1 integrates a plurality of battery cells 11, and adjacent battery cells 11 are electrically connected, so that the space utilization rate inside the battery pack is higher, thereby effectively improving the energy density of the battery pack. In addition, as Figure 3 and Figure 4 shown, battery cell 11 of the present application includes a first end face 11a and a second end face 11b provided with terminals 111, and an explosion-proof valve 112 is also arranged on the first end face 11a. During the actual installation process of battery assembly 1, the first end face 11a of each battery cell 11 is located on the same side of battery assembly 1. When the battery cell 11 has overvoltage or overheating, the explosion-proof valve 112 needs to open and release the internal pressure of the battery cell 11, and the structural setting of battery assembly 1 enables the internal heat of the battery cell 11 to be concentrated and released through the first end face 11a, thus avoiding the situation of opposite spraying of the explosion-proof valves 112 of different battery assemblies 1, effectively reducing the risk of thermal runaway spread, optimizing the thermal management system of the battery pack, and further improving the overall stability and safety of the battery pack and the vehicle. Moreover, for battery assembly 1 of the present application, only by installing battery cells 11 with the same structure in different placement directions can the effect of making all the explosion-proof valves 112 face the same side be achieved, effectively simplifying the production and installation processes of battery assembly 1.

[0041] In addition, since the battery module 1 only releases pressure on one side, there is no need to consider excessive spraying of the explosion-proof valve 112. Therefore, there is no need to set additional blocking structures between adjacent battery modules 1. As a result, the safety distance between different battery modules 1 in the battery pack is further reduced, making the internal structure of the battery pack more compact, with higher space utilization and energy density. This optimizes the internal structure layout of the vehicle and production costs, improves the performance of the battery pack and the endurance of the vehicle.

[0042] In an alternative embodiment, on the first end face 11a, the pole posts 111 and the explosion-proof valves 112 of the battery cells 11 are distributed along the height direction Z of the battery module 1. Two adjacent battery cells 11 are referred to as the first battery cell 114 and the second battery cell 115.

[0043] Along the height direction Z, the explosion-proof valve 112 of the first battery cell 114 is arranged closer to the upper end of the first end face 11a than the pole post 111, and the explosion-proof valve 112 of the second battery cell 115 is arranged closer to the lower end of the first end face 11a than the pole post 111. The polarities of the pole posts 111 of the first battery cell 114 and the second battery cell 115 that are arranged closer to the explosion-proof valve 112 are the same. The length direction X is different from the height direction Z.

[0044] As Figure 5 shown, the explosion-proof valve 112 of the first battery cell 114 is located at the upper end, the pole posts 111 are respectively arranged in the middle and at the lower end, the explosion-proof valve 112 of the second battery cell 115 is located at the lower end, and the pole posts 111 are respectively arranged in the middle and at the upper end. As a result, the pole posts 111 of two adjacent battery cells 11 are arranged in a staggered manner in terms of spatial position. Therefore, when the battery module 1 electrically connects two adjacent battery cells 11, the connecting pieces can form a staggered form of one on top and one below. Such a structural design not only optimizes the distribution of the explosion-proof valves 112 of the battery module 1, but also makes the electrical connection between adjacent battery cells 11 more convenient and has higher space utilization, thereby reducing the complexity of the circuit design, reducing the possibility of short circuits and other situations between adjacent battery cells 11, and improving the convenience during production and maintenance.

[0045] It should be noted that in the embodiments described in this application, the structural design is based on a four-pole-post battery cell. In other alternative embodiments, according to different application scenarios, working conditions, and user requirements of the battery module 1, the specific structure of the battery cell can be adjusted accordingly. For example, a six-pole-post battery cell, an eight-pole-post battery cell, or other forms of battery cells can be used. This application does not limit this.

[0046] In addition, the first battery cell 114 and the second battery cell 115 are adjacent battery cells 11. Taking Figure 5Taking the illustrated embodiment as an example, every two battery cells 11 form a group, and the first battery cell 114 is on the left and the second battery cell 115 is on the right in the connection direction Y. However, this should be exemplary rather than restrictive. In fact, the first battery cell 114 can also be on the right of the second battery cell 115 in the connection direction Y. The present application does not limit this. Figure 5 The first battery cell 114 on the left and the second battery cell 115 on the right are shown in Figure 5 . However, this should be exemplary rather than restrictive. In fact, the first battery cell 114 can also be on the right of the second battery cell 115 in the connection direction Y. The present application does not limit this.

[0047] In Figure 5 In order to facilitate observing the arrangement order and structure of the battery cells 11, the present application specifically hides the first connecting member 12 connected to the battery cells 11 near Figure 5 the right side. As can be intuitively seen from Figure 5 that the first end face 11a of the battery cell 11 is configured such that the negative electrode terminal 111b is in the middle, the explosion-proof valve 112 and the positive electrode terminal 111a are respectively at both ends of the negative electrode terminal 111b. During assembly, a plurality of battery cells 11 are assembled into a complete battery assembly 1 in the up-and-down manner of the explosion-proof valve 112 along the height direction Z. In other alternative embodiments, the first end face 11a can also be configured such that the positive electrode terminal 111a is in the middle, the explosion-proof valve 112 and the negative electrode terminal 111b are respectively at both ends of the positive electrode terminal 111a; or the explosion-proof valve 112 is arranged in the middle of the first end face 11a, and the positive electrode terminal 111a and the negative electrode terminal 111b are respectively at both ends of the explosion-proof valve 112, etc. The present application does not limit this either.

[0048] Referring to Figure 5 and Figure 6 in the alternative embodiment, the battery assembly 1 further includes a first connecting member 12. The first connecting member 12 includes a first connecting portion 121, a second connecting portion 122, and a bending portion 123. The first connecting portion 121 and the second connecting portion 122 are respectively connected to both ends of the bending portion 123. Among them, both the first connecting portion 121 and the second connecting portion 122 extend along the height direction Z, and the bending portion 123 extends along the connection direction Y of the battery cells 11. The connection direction Y is different from the height direction Z. The first connecting portion 121 and the second connecting portion 122 are respectively electrically connected to the poles 111 with different polarities of the first battery cell 114 and the second battery cell 115.

[0049] The design of the first connecting member 12 in the present application simplifies the electrical connection method between the battery cells 11 of the battery assembly 1, optimizes the structural layout of the battery assembly 1, and moreover, the structural design of the first connecting member 12 also improves the reliability of the electrical connection between different battery cells 11, avoids the occurrence of short circuits between the poles 111 of the battery cells 11, and further improves the reliability of the battery assembly 1 and the battery pack.

[0050] In addition, in combination with the arrangement of the first battery cell 114 and the second battery cell 115 described above, the structural design of the first connecting member 12 enables it to be arranged in an alternating up-and-down manner after being installed on the battery cell 11. Such a design improves the independence of different first connecting members 12, effectively reduces the occurrence of short circuits caused by the mutual contact of two adjacent first connecting members 12, and also ensures that the size of the bent portion 123 of the first connecting member 12 will not be restricted to be too narrow, thereby ensuring the size of its current-carrying area and avoiding the situation where part of the structure of the first connecting member 12 generates heat due to too small a current-carrying area, thus improving the overall stability and safety of the battery assembly 1.

[0051] Meanwhile, the design of the bent portion 123 of the first connecting member 12 enables the first connecting member 12 to be adjusted accordingly according to the specific structure, arrangement mode, etc. of the battery cell 11, so that the first connecting member 12 can adapt to the design requirements of different battery assemblies 1, effectively improving the flexibility of the first connecting member 12 in the actual application process.

[0052] In an optional embodiment, the first connecting portion 121 is connected to the terminal 111 of the battery cell 11 disposed near the explosion-proof valve 112, and the second connecting portion 122 is connected to the terminal 111 of the battery cell 11 disposed away from the explosion-proof valve 112. Wherein, the outer edge of the first connecting portion 121 on the side close to the explosion-proof valve 112 is set as an arc edge 1211, and the outer edge of the second connecting portion 122 on the side close to the explosion-proof valve 112 is set as a right-angle edge 1221.

[0053] In the actual installation scenario of the battery assembly 1, the present application sets the outer edge of the first connecting portion 121 on the side close to the explosion-proof valve 112 as an arc edge 1211, so that after the first connecting member 12 is installed, it will not block the explosion-proof valve 112, thereby reducing the possibility of damage or even short circuit of the first connecting member 12 caused by the ejection of the explosion-proof valve 112. Meanwhile, the outer edge of the second connecting portion 122 on the side close to the explosion-proof valve 112 is set as a right-angle edge 1221, thereby increasing the fitting area between the first connecting member 12 and the terminal 111, further ensuring the size of the current-carrying area of the first connecting member 12, improving the stability of the first connecting member 12, as well as the current transmission efficiency and stability of the battery assembly 1 during operation.

[0054] Of course, in other alternative embodiments, according to the actual application scenarios, working conditions, user requirements, etc. of the battery assembly 1, the specific structure of the first connecting member 12 can be adjusted accordingly. For example: only the outer edge of the first connecting portion 121 near the explosion-proof valve 112 can be set as an arc edge 1211; or only the outer edge of the second connecting portion 122 near the explosion-proof valve 112 can be set as a right-angle edge 1221; or the outer edges of both the first connecting portion 121 and the second connecting portion 122 can be set as arc edges 1211 or both can be set as right-angle edges 1221, etc., so as to be able to adapt to the installation of battery assemblies 1 with different scenarios and structures, and also improve the convenience during the production of the first connecting member 12. Therefore, the present application does not limit this either.

[0055] In addition, as Figure 7 shown, on the other side of the battery assembly 1, that is, on the side where the second end face 11b of the battery cell 11 is located, correspondingly, a pole column 111 is also provided on the second end face 11b, and forms a positive-negative corresponding relationship with the pole column 111 on the first end face 11a. For example: in the battery cell 11 with a negative pole column 111b provided in the middle of the first end face 11a, a positive pole column 111a is correspondingly provided in the middle of its second end face 11b. Similarly, if a positive pole column 111a is provided at the top of the first end face 11a of the battery cell 11, then a negative pole column 111b is correspondingly provided at the top of its second end face 11b. At the same time, on the side where the second end face 11b is located, a plurality of first connecting members 12 are also provided to electrically connect the pole columns 111 of different polarities of adjacent battery cells 11, so that a plurality of battery cells 11 are integrated into a complete battery assembly 1. In addition, a liquid injection hole 113 is also provided on the second end face 11b, and the position of the liquid injection hole 113 corresponds to the position of the explosion-proof valve 112, and is used to inject electrolyte into the battery cell 11 to ensure the normal operation of the battery cell 11.

[0056] As Figure 8 shown, in an alternative embodiment, along the height direction Z, the explosion-proof valves 112 of the first battery cell 114 and the second battery cell 115 are both arranged closer to the lower end of the first end face 11a compared to the pole columns 111. The polarities of the pole columns 111 of the first battery cell 114 arranged closer to the explosion-proof valve 112 and the pole columns 111 of the second battery cell 115 arranged closer to the explosion-proof valve 112 are different.

[0057] In this embodiment, two different structures of battery cells 11 are provided. Specifically, on the first end face 11a, the polarities of the pole columns 111 of the first battery cell 114 arranged closer to the explosion-proof valve 112 and the pole columns 111 of the second battery cell 115 arranged closer to the explosion-proof valve 112 are opposite. Taking Figure 8Taking the battery assembly 1 shown as an example, the pole 111 of the first battery cell 114 disposed near the explosion-proof valve 112 is configured as the positive pole 111a, then the pole 111 of the second battery cell 115 disposed near the explosion-proof valve 112 is configured as the negative pole 111b. By alternately arranging the battery cells 11 of two different structures and disposing the explosion-proof valve 112 of each battery cell 11 near the lower end of the first end face 11a, when the explosion-proof valve 112 is opened and releases the internal pressure of the battery cell 11, the ejection position is close to the bottom of the battery assembly 1. In this way, even if the electrolyte inside the battery cell 11 flows out from the explosion-proof valve 112, it will directly flow onto the bottom plate of the battery pack and will not flow to the pole 111 of the battery cell 11 or the position of other explosion-proof valves 112. It can be seen that the design of the battery assembly 1 in this application further reduces the risk of thermal runaway spread and further ensures the structural safety of the battery cell 11, thereby improving the overall stability and safety of the battery pack and the vehicle.

[0058] At the same time, the alternate arrangement of the battery cells 11 of two different structures also makes the polarities of the adjacent two poles 111 of the first battery cell 114 and the second battery cell 115 opposite on the same end face. Thus, the connecting member can directly connect the poles 111 of the two battery cells 11 along the connecting direction Y, effectively improving the convenience in the production and installation processes of the connecting member and improving the installation efficiency of the battery assembly 1.

[0059] In an alternative embodiment, as shown in Figure 8 and Figure 9 the battery assembly 1 further includes a second connecting member 13, and the second connecting member 13 includes a third connecting portion 131 and a fourth connecting portion 132. The third connecting portion 131 and the fourth connecting portion 132 are distributed along the connecting direction Y of the battery cells 11. The third connecting portion 131 and the fourth connecting portion 132 are respectively electrically connected to the poles 111 with different polarities of the first battery cell 114 and the second battery cell 115.

[0060] As recorded above, the alternate arrangement of the battery cells 11 of two different structures makes the polarities of the adjacent two poles 111 of the first battery cell 114 and the second battery cell 115 opposite on the same end face. Therefore, the second connecting member 13 can be directly arranged along the connecting direction Y and connect the poles 111 of the two battery cells 11 through the third connecting portion 131 and the fourth connecting portion 132, effectively improving the convenience in the production and installation processes of the connecting member and improving the installation efficiency of the battery assembly 1. Moreover, the design of the second connecting member 13 further ensures that its current-carrying area is sufficient, making the current distribution generated during the working process more uniform, thereby reducing the possibility of serious heating caused by too small current-carrying area or current concentration. Moreover, the structure of the second connecting member 13 is regular, improving the convenience of both its production and assembly processes.

[0061] In an alternative embodiment, the second connecting member 13 further includes a deformation portion 133 disposed between the third connecting portion 131 and the fourth connecting portion 132. After the third connecting portion 131 and the fourth connecting portion 132 are respectively electrically connected to the pole columns 111 with different polarities of the first battery cell 114 and the second battery cell 115, the deformation portion 133 is located between the first battery cell 114 and the second battery cell 115.

[0062] In this application, by providing the deformation portion 133 between the third connecting portion 131 and the fourth connecting portion 132, the second connecting member 13 can be deformed and adjusted according to the height of the pole columns 111 of the battery cells 11. For example: during the actual assembly of the battery module 1, if the heights of the pole columns 111 of the first battery cell 114 and the second battery cell 115 are inconsistent, it will cause a certain gap at the connection after the connecting member is connected to the pole column 111, resulting in unstable connection and small current-carrying area. However, the second connecting member 13 in this application can deform through the deformation portion 133 to offset the height difference. Such a design ensures a more stable connection and more uniform contact between the second connecting member 13 and the pole column 111, thereby ensuring the structural stability of the battery module 1, optimizing the current path between the battery cells 11, and enhancing the power output capacity and efficiency of the battery module 1.

[0063] At the same time, the design of the deformation portion 133 also enables the second connecting member 13 to resist part of the mechanical stress during the assembly and use of the battery cells 11, such as vibration, impact, etc., thereby preventing the second connecting member 13 from being damaged due to stress concentration and enhancing the durability and service life of the second connecting member 13. In addition, the design of the deformation portion 133 also enables the second connecting member 13 to be applied to a wider range of usage scenarios, thereby meeting different usage requirements.

[0064] It should be noted that, in an alternative embodiment, according to different usage scenarios, working conditions and user requirements of the battery module 1, etc., the specific structure of the deformation portion 133 can be adjusted accordingly. For example: the deformation portion 133 can be designed in the shape of a hinge, or designed as an elastic plate-like structure, etc., and this application does not limit this either.

[0065] And in Figure 9 the shown alternative embodiment, the deformation portion 133 includes a first side wall 1331, a second side wall 1332, and a groove 1333 formed by the first side wall 1331 and the second side wall 1332; the first side wall 1331 is connected to the third connecting portion 131, and the second side wall 1332 is connected to the fourth connecting portion 132.

[0066] The design of the deformation part 133 enhances its overall structural strength, enabling it to withstand greater deformation forces without being easily damaged. At the same time, the structural design of the side wall of the deformation part 133 and the groove 1333 makes its deformation direction more controllable, capable of precisely adapting to the height difference of the pole posts 111 of the battery cell 11 or other deformation requirements, and also enables it to adopt a modular manufacturing process, thus simplifying the production process and improving production efficiency.

[0067] Similarly, in an alternative embodiment, on the other side of the battery assembly 1, that is, on the side where the second end face 11b of the battery cell 11 is located, a pole post 111 is also correspondingly provided on the second end face 11b, and forms a positive-negative corresponding relationship with the pole post 111 on the first end face 11a. For example: taking Figure 10 the battery assembly 1 shown as an example, in the battery cell 11 with a negative pole post 111b provided in the middle of the first end face 11a, a positive pole post 111a is correspondingly provided in the middle of its second end face 11b. Similarly, if a positive pole post 111a is provided in the middle of the first end face 11a of the battery cell 11, then a negative pole post 111b is correspondingly provided in the middle of its second end face 11b. At the same time, on the side where the second end face 11b is located, a plurality of second connectors 13 are also provided to electrically connect the pole posts 111 of different polarities of adjacent battery cells 11, thereby integrating a plurality of battery cells 11 into a complete battery assembly 1. In addition, a liquid injection hole 113 is also provided on the second end face 11b, and the position of the liquid injection hole 113 corresponds to the position of the explosion-proof valve 112, for injecting electrolyte into the battery cell 11 to ensure the normal operation of the battery cell 11.

[0068] It should be noted that the technical solutions or technical features described in the above embodiments can be combined or supplemented with each other without conflict. The scope of protection of this application is not limited to the precise structures described in the above embodiments and shown in the drawings; all modifications, equivalent replacements, improvements, etc. made within the spirit and principles of this application shall be included within the scope of protection of this application.

Claims

1. A battery assembly, characterized in that: include: A battery cell, comprising a pole, an explosion-proof valve, and a first end face and a second end face arranged opposite to each other along a length direction; the first end face and the second end face are both provided with the pole; the pole comprises a positive pole and a negative pole; the explosion-proof valve is arranged on the first end face; There are multiple battery cells; the first end faces of the multiple battery cells are all located on the same side of the battery assembly, and adjacent battery cells are electrically connected.

2. The battery assembly according to claim 1, characterized in that: On the first end surface, the poles and explosion-proof valves of the battery cells are distributed along the height direction of the battery assembly; Two adjacent battery cells are referred to as a first battery cell and a second battery cell; Along the height direction, the explosion-proof valve of the first battery cell is arranged closer to the upper end of the first end face than the pole, and the explosion-proof valve of the second battery cell is arranged closer to the lower end of the first end face than the pole; the polarity of the pole of the first battery cell close to the explosion-proof valve and the polarity of the pole of the second battery cell close to the explosion-proof valve are the same; the length direction is different from the height direction.

3. The battery assembly according to claim 2, characterized in that: The battery assembly also includes: The first connecting member comprises a first connecting portion, a second connecting portion and a bending portion; the first connecting portion and the second connecting portion are respectively connected to two ends of the bending portion; wherein the first connecting portion and the second connecting portion both extend along a height direction, and the bending portion extends along a connecting direction of the battery cell; the connecting direction is different from the height direction; The first connection portion and the second connection portion are electrically connected to poles with different polarities of the first battery cell and the second battery cell, respectively.

4. The battery assembly according to claim 3, characterized in that: The first connection portion is connected to a pole of the battery cell that is close to the explosion-proof valve, and the second connection portion is connected to a pole of the battery cell that is far from the explosion-proof valve; Wherein, the outer edge of the first connection part close to the explosion-proof valve is set as an arc edge; and / or the outer edge of the second connection part close to the explosion-proof valve is set as a right-angle edge.

5. The battery assembly according to claim 1, characterized in that: On the first end surface, the poles and explosion-proof valves of the battery cells are distributed along the height direction of the battery assembly; Two adjacent battery cells are referred to as a first battery cell and a second battery cell; Along the height direction, the explosion-proof valve of the first battery cell and the explosion-proof valve of the second battery cell are both arranged closer to the lower end of the first end face than the pole; the polarity of the pole of the first battery cell close to the explosion-proof valve and the polarity of the pole of the second battery cell close to the explosion-proof valve are different; the length direction is different from the height direction.

6. The battery assembly according to claim 5, characterized in that: The battery assembly also includes: A second connecting member, comprising a third connecting portion and a fourth connecting portion; the third connecting portion and the fourth connecting portion are distributed along a connecting direction of the battery cell, and the connecting direction is different from the height direction; The third connection portion and the fourth connection portion are electrically connected to poles with different polarities of the first battery cell and the second battery cell, respectively.

7. The battery assembly according to claim 6, characterized in that: The second connecting member also includes a deformation portion arranged between the third connecting portion and the fourth connecting portion; after the third connecting portion and the fourth connecting portion are respectively electrically connected to the poles with different polarities of the first battery cell and the second battery cell, the deformation portion is located between the first battery cell and the second battery cell.

8. The battery assembly according to claim 7, characterized in that: The deformation portion includes a first side wall, a second side wall, and a groove surrounded by the first side wall and the second side wall; the first side wall is connected to the third connection portion, and the second side wall is connected to the fourth connection portion.

9. A battery pack, characterized in that: Comprising the battery assembly as described in any one of claims 1-8.

10. A vehicle, characterized in that: Comprising the battery pack as claimed in claim 9.

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