Battery module, battery pack and vehicle

Abstract

The invention discloses a battery module, a battery pack and a vehicle, relates to the related technical field of batteries, and is used for solving the problems of high production cost and complex assembly process of the existing battery module. The battery module provided by the invention comprises a plurality of battery cells stacked along a first direction, a pole is arranged on one side of each battery cell in a second direction, a positioning groove is formed in each pole, at least one conducting bar is connected with two poles with different polarities of adjacent battery cells, the conducting bar is provided with a first connecting part and a second connecting part which are connected, and the first connecting part is connected with the second connecting part. The first connecting part is positioned in the positioning groove of the pole of one battery cell, and the second connecting part is positioned in the positioning groove of the pole of the adjacent battery cell. According to the battery module, the positioning grooves are formed in the pole columns of the battery cells, and the first connecting parts and the second connecting parts of the conducting bars are respectively embedded into the positioning grooves of the pole columns with different polarities of the adjacent battery cells, so that a tray for positioning is omitted, the assembly process of the battery module is simplified, and the production cost and the assembly process complexity of the battery module are reduced.

Description

Technical Field

[0001] The present application relates to the field of vehicle manufacturing technology, and in particular to a battery module, a battery pack and a vehicle. Background Art

[0002] In existing battery module manufacturing technology, in order to achieve electrical connection and signal acquisition between multiple battery cells, a tray formed by vacuum forming or injection molding is usually used as an integrated carrier of the aluminum bar and the battery cells. The tray is used to position and fix the aluminum bar and the battery cells during welding or crimping.

[0003] However, after the aluminum bar and the battery cell are welded or fixed, the function of the tray will be ineffective. However, since the tray has been integrated into the battery module as a structural component, it not only causes material waste, but also increases the assembly process of the aluminum bar and the tray during the battery module assembly process, increasing production costs and the complexity of the assembly process. Summary of the Invention

[0004] The present application provides a battery module, a battery pack and a vehicle, which can solve the problems of high production cost and complex assembly process of existing battery modules.

[0005] To achieve the above objectives, in a first aspect, the present application provides a battery module having a first direction and a second direction intersecting each other, the battery module comprising: A plurality of battery cells are stacked along a first direction, each battery cell is provided with a pole on one side in a second direction, and a positioning groove is provided on the pole; Multiple conductive bars, at least one conductive bar connects two poles of different polarities of adjacent battery cells, the conductive bar has a first connecting portion and a second connecting portion connected to each other, the first connecting portion is located in the positioning groove of the pole of one battery cell, and the second connecting portion is located in the positioning groove of the pole of the adjacent battery cell.

[0006] In some embodiments of the present application, each battery cell includes an end cover, the pole includes a main body and a first positioning portion and a second positioning portion connected to the main body, the main body is passed through the end cover, and the first positioning portion and the second positioning portion are spaced apart in the first direction to form a positioning groove.

[0007] In some embodiments of the present application, the first positioning portion is a first conductive spring piece, the second positioning portion is a second conductive spring piece, and the first conductive spring piece and the second conductive spring piece are both conductively connected to the body on the same side in the second direction.

[0008] In some embodiments of the present application, the conductive bar includes a main body portion connected between a first connecting portion and a second connecting portion, and the first connecting portion and the second connecting portion are both bent relative to the main body portion.

[0009] In some embodiments of the present application, the first connecting portion is interference fit with the positioning groove of the pole of one battery cell, and the second connecting portion is interference fit with the positioning groove of the pole of an adjacent battery cell.

[0010] In some embodiments of the present application, a dimension of the first connecting portion in the first direction is D1, a dimension of the positioning groove in the first direction is D2, and the following conditions are satisfied: D1 = (1.3-1.5) × D2.

[0011] In some embodiments of the present application, in the second direction, the insertion depth of the first connecting portion into the corresponding positioning groove in the second direction is greater than or equal to 5 mm; and / or, the insertion depth of the second connecting portion into the corresponding positioning groove in the second direction is greater than or equal to 5 mm.

[0012] In some embodiments of the present application, the first connection portion is welded to the pole of one battery cell or fixedly connected by a fastener, and the second connection portion is welded to the pole of an adjacent battery cell or fixedly connected by a fastener.

[0013] In some embodiments of the present application, the battery module further has a third direction, and the second direction, the first direction, and the third direction intersect with each other; Each battery cell includes an end cover located on the same side in the second direction, and has two poles, namely a positive pole and a negative pole. Each end cover is provided with a positive pole and a negative pole arranged at intervals along the third direction, and the positive pole on one battery cell and the negative pole on the adjacent battery cell are arranged opposite to each other in the first direction.

[0014] In some embodiments of the present application, an explosion-proof valve is provided on the end cover of each battery cell, and the explosion-proof valve is located between the positive electrode column and the negative electrode column of the corresponding battery cell.

[0015] In some embodiments of the present application, the battery module further includes: An insulating member is provided on at least one side of the battery core in a first direction.

[0016] In some embodiments of the present application, a plurality of battery cells sequentially arranged along a first direction constitute a battery cell group, and the battery module further includes: Two end plates, one of the two end plates is arranged on one side of the battery cell group in the first direction, and the other end plate is arranged on the other side of the battery cell group in the first direction; The fixing piece is used to connect the two end plates.

[0017] In a second aspect, the present application further provides a battery pack, comprising: cabinet; and, As described in any of the above technical solutions, the battery module is installed in a box.

[0018] On the third aspect, the present application also provides a vehicle, comprising a battery pack as described in any of the above technical solutions.

[0019] The above technical solution of this application has at least the following beneficial effects: In this technical solution, positioning slots are provided on the battery cell poles, allowing the first and second connecting portions of the conductive bar to be respectively embedded in the positioning slots of the poles of adjacent cells with different polarities, thereby eliminating the intermediate structure that traditionally relies on a tray for positioning and support. This structure integrates the positioning and fixing functions previously performed by the tray into the battery cell poles, securing the conductive bar in the poles and preventing the tray from becoming a redundant component and being retained in the battery module. This reduces material waste and eliminates the assembly process of the conductive bar and tray, simplifying the battery module assembly process, significantly reducing production costs and assembly process complexity. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0021] Figure 1 is a three-dimensional diagram of a battery module in an embodiment of the present application; Figure 2 is an enlarged view of a battery cell in a battery module according to an embodiment of the present application; Figure 3 This is an enlarged view of the conductive bar in the battery module in the embodiment of the present application; Figure 4 yes Figure 2 A magnified view of part A in FIG; Figure 5 is a top view of the battery module in an embodiment of the present application; Figure 6 yes Figure 5 Cross-sectional view of section BB in ; Figure 7 yes Figure 6 Enlarged view of part C in ; Figure 8 It is an exploded view of the battery module in the embodiment of the present application.

[0022] Description of reference numerals: 1-battery cell; 11-pole; 11a-positive pole; 11b-negative pole; 111-positioning groove; 112-body; 113-first positioning portion; 114-second positioning portion; 12-end cover; 13-explosion-proof valve; 2-conductive bar; 21-first connecting portion; 22-second connecting portion; 23-main body; 3-insulating member; 4-end plate; 5-fixing member; X-first direction; Z-second direction; Y-third direction. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without making creative efforts are within the scope of protection of this application.

[0024] In the description of this application, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application.

[0025] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature specified as "first" or "second" may explicitly or implicitly include one or more of such features. Throughout this application, unless otherwise specified, "plurality" means two or more.

[0026] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections, direct connections, indirect connections through an intermediate medium, or internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances.

[0027] The present application provides a battery module, a battery pack, and a vehicle, which are described in detail below. It should be noted that the order of description of the following embodiments does not limit the preferred order of the embodiments of the present application. In the following embodiments, the description of each embodiment has its own emphasis. For parts not described in detail in one embodiment, please refer to the relevant description of other embodiments.

[0028] In existing battery module manufacturing technology, in order to achieve electrical connection and signal acquisition between multiple battery cells, a tray formed by vacuum forming or injection molding is usually used as an integrated carrier of the aluminum bar and the battery cell. The tray is used to position and fix the aluminum bar and the battery cell during the welding or crimping process to ensure the relative position between the aluminum bar and the battery cell is accurate.

[0029] However, after the aluminum bar and the battery cell are welded or fixed, the function of the tray will be ineffective. However, since the tray has been integrated into the battery module as a structural component, it not only causes material waste, but also increases the assembly process of the aluminum bar and the tray during the battery module assembly process, increasing production costs and the complexity of the assembly process.

[0030] Therefore, the existing reliance on pallets in the aluminum bar integration process has problems such as low material utilization and process redundancy. There is an urgent need for a technical solution that can reduce or replace the use of pallets, improve integration efficiency and reduce costs.

[0031] Therefore, this application provides a new type of battery module. Figure 1 、 Figure 2 and Figure 3 The battery module has a first direction X and a second direction Z that intersect each other. The battery module includes a plurality of battery cells 1 and a plurality of conductive bars 2 stacked along the first direction X. Each battery cell 1 is provided with a pole 11 on one side in the second direction Z, and a positioning groove 111 is provided on the pole 11. At least one conductive bar 2 connects two poles 11 of different polarities of adjacent battery cells 1. The conductive bar 2 has a first connecting portion 21 and a second connecting portion 22 connected to each other. The first connecting portion 21 is located in the positioning groove 111 of the pole 11 of one battery cell 1, and the second connecting portion 22 is located in the positioning groove 111 of the pole 11 of the adjacent battery cell 1.

[0032] In this technical solution, by providing positioning grooves 111 on the poles 11 of the battery cells 1, the first connecting portion 21 and the second connecting portion 22 of the conductive bar 2 are respectively embedded in the positioning grooves 111 of the poles 11 of the different polarities of the adjacent battery cells 1, thereby eliminating the intermediate structure that traditionally relies on a tray for positioning and support. This structure integrates the positioning and fixing functions originally performed by the tray onto the poles 11 of the battery cells 1, securing the conductive bar 2 to the poles 11 and preventing the tray from becoming a redundant component and being retained in the battery module. This not only reduces material waste, but also eliminates the assembly process of the conductive bar 2 and the tray, simplifying the battery module assembly process, thereby significantly reducing production costs and assembly process complexity.

[0033] Specifically, after the connecting portions of the conductive bar 2 (the first connecting portion 21 and the second connecting portion 22) are directly embedded in the positioning groove 111 of the pole 11, they form a dual function of mechanical interlocking and electrical conduction with the pole 11, significantly improving the connection stability between the conductive bar 2 and the pole 11. Because the conductive bar 2 is firmly fixed to the pole 11, no tray is required for additional fixation, eliminating the traditional tray assembly process and reducing the number of assembly steps. More importantly, as an independent structural component (especially a blister or injection molded tray), the tray itself has high material and mold costs. For large-scale mass-produced battery modules, eliminating the tray can directly reduce material input and significantly reduce production costs.

[0034] Please refer to Figure 2 and Figure 4 Each battery cell 1 includes an end cap 12, and the pole 11 includes a body 112 and a first positioning portion 113 and a second positioning portion 114 connected to the body 112. The body 112 is inserted into the end cap 12, and the first positioning portion 113 and the second positioning portion 114 are spaced apart in the first direction X to form a positioning groove 111. The positioning groove 111 is directly formed by the structure of the pole 11 itself (the first positioning portion 113 and the second positioning portion 114), eliminating the need for additional components. This reduces material costs and avoids process redundancy caused by tray assembly, significantly improving production efficiency and making the battery module structure more compact. In other words, the positioning groove 111 extends along the third direction Y and penetrates the pole 11, and also penetrates the end face of the pole 11 facing away from the end cap 12, thereby allowing the conductive bar 2 to be inserted from either end of the positioning groove 111, eliminating the need to strictly distinguish between assembly directions and simplifying the operation process.

[0035] It is understood that the end cap 12 forms part of the housing of the battery cell 1, and the electrode assembly is disposed within the housing. One end of the body 112 of the electrode post 11 is located within the housing and electrically connected to the electrode assembly, while the other end passes through the end cap 12 and is at least exposed to the exterior of the housing. Connected to the end surface of the body 112 located outside the housing are a first positioning portion 113 and a second positioning portion 114 spaced apart in a first direction X. The space between the first positioning portion 113 and the second positioning portion 114 forms a positioning groove 111.

[0036] Furthermore, the through-hole positioning slots 111 can accommodate a conductive bar 2 whose width exceeds that of a single pole 11, enabling the conductive bar 2 to be fixed at multiple points in the third direction Y. This significantly improves the conductive bar 2's resistance to bending and displacement over long spans, preventing deformation or loosening due to localized forces, making it particularly suitable for high-vibration environments. In other words, the dimension of the conductive bar 2 in the third direction Y is larger than the dimension of the positioning slots 111 in the third direction Y.

[0037] Illustratively, in the second direction Z, and toward the end cap 12, the positioning groove 111 has a gradually increasing dimension in the first direction X. Specifically, the first and second positioning portions 113, 114 have their largest dimensions in the first direction X at the ends facing away from the body 112. During the insertion of the first and second connecting portions 21, 22 of the conductive bar 2, the positioning groove 111 forms a "flare-mouth" guiding structure, facilitating insertion of the first and second connecting portions 21, 22.

[0038] Based on the above embodiment, the first positioning portion 113 is a first conductive spring piece, and the second positioning portion 114 is a second conductive spring piece. The first conductive spring piece and the second conductive spring piece are both electrically connected to the body 112 on the same side in the second direction Z. The conductive spring piece has elastic deformation capabilities and can adapt to the dimensional changes of the conductive bar 2, continuously maintaining the pressure on the conductive bar 2, and avoiding increased contact resistance or false connection problems caused by looseness. Under vibration or impact conditions during battery module operation, the conductive spring piece utilizes its elastic properties to maintain stable contact between the conductive bar 2 and the positioning groove 111 of the terminal 11, significantly improving the long-term reliability of the electrical connection, which is particularly suitable for high-dynamic environments such as electric vehicles.

[0039] To a certain extent, the contact surface between the conductive spring piece and the conductive bar 2 is in an elastically pressed state, resulting in an actual contact area greater than that of a rigid connection, effectively reducing contact resistance. Furthermore, the elastic distribution of the conductive spring piece ensures that contact pressure is evenly applied to the surface of the conductive bar 2, preventing overheating or material damage caused by localized pressure concentration, thereby extending the service life of the conductive bar 2.

[0040] In this embodiment, the conductive bar 2 also includes a main body 23 connected between a first connecting portion 21 and a second connecting portion 22. Both the first connecting portion 21 and the second connecting portion 22 are bent relative to the main body 23. This bent design offsets the first and second connecting portions 21, 22 from the main body 23 in the second direction Z, preventing interference between the main body 23 and other conductive components. This makes the internal layout of the battery module more compact and helps improve the energy density of the battery pack. Furthermore, the main body 23 serves as a direct connection, with the bent connecting portions at both ends (the first connecting portion 21 and the second connecting portion 22) pointing directly toward the terminals 11 of adjacent battery cells 1. This makes the current transmission path from one end to the other more direct and compact, reducing circuitous or redundant lengths, and lowering line impedance and heat generation risks. Furthermore, the first and second connecting portions 21, 22 are both bent relative to the main body 23, allowing for a single-step stamping process, eliminating the need for welding or assembly of additional parts, thus reducing production steps and material costs.

[0041] In addition, the bending section at the connection between the first connecting part 21, the second connecting part 22 and the main body 23 can be designed to be an arc-shaped structure or a structure with elastic margin. When the battery module vibrates or expands or contracts due to heat, the bending section can absorb stress through slight deformation, thereby avoiding rigid fracture of the main body 23 and the first connecting part 21 (and the second connecting part 22), thereby enhancing long-term reliability.

[0042] For example, the bent structure allows the first and second connecting portions 21, 22 to be approximately perpendicular to the main body 23. This creates a clear guide angle during assembly, allowing for quick alignment with the positioning slots 111 on the poles 11, preventing the conductive bar 2 from shifting or misaligning. This is particularly suitable for the high-precision alignment requirements of automated production lines. In other words, the cross-section of the conductive bar 2 is generally U-shaped.

[0043] Please refer to Figures 5 to 7 In this embodiment, the first connecting portion 21 forms an interference fit with the positioning groove 111 of the pole 11 of one battery cell 1, and the second connecting portion 22 forms an interference fit with the positioning groove 111 of the pole 11 of the adjacent battery cell 1, making it suitable for battery packs in vibration-free usage scenarios. The interference fit allows the conductive bar 2 (such as an aluminum bar) to be embedded in the positioning groove 111 through the friction force generated by elastic deformation, achieving a stable connection without the need for additional fasteners 5 such as bolts and clips, simplifying the assembly process. Under vibration or impact conditions during battery module operation, the preload force generated by the interference fit can resist relative displacement between the connecting portions (first connecting portion 21 and second connecting portion 22) and the pole 11, preventing loosening or poor contact.

[0044] It is understandable that the first connecting portion 21 is interference-fitted with the positioning groove 111 of the pole 11 of a battery cell 1. That is, the dimension of the first connecting portion 21 in the first direction X is D1, and the dimension of the positioning groove 111 in the first direction X is D2, and D1 is greater than D2 to achieve an interference fit between the two.

[0045] Specifically, the dimension of the first connecting portion 21 in the first direction X is D1, and the dimension of the positioning groove 111 in the first direction X (e.g., the minimum dimension of the positioning groove 111 in the first direction X) is D2, satisfying the following equation: D1 = (1.3-1.5) × D2. D1 is slightly larger than D2 (1.3-1.5 times) to ensure that the connecting portion undergoes moderate elastic deformation when inserted into the positioning groove 111, creating a reliable frictional fixation. This prevents loosening due to insufficient interference fit, or assembly difficulties or even structural damage due to excessive interference fit. This moderate interference fit ensures a tight fit between the connecting portion and the inner wall of the positioning groove 111, maximizing contact area and ensuring a continuous current path with low impedance, reducing the risk of heat generation and improving electrical conductivity.

[0046] Controlling the interference fit within a range of 1.3 to 1.5 times can ensure the tightening force while preventing excessive deformation from damaging the opposing surfaces of the first and second positioning portions 113, 114 of the conductive bar 2 or the pole 11, thereby reducing the scrap rate. For example, D1 = 1.3 × D2, D1 = 1.35 × D2, D1 = 1.40 × D2, D1 = 1.45 × D2, or D1 = 1.5 × D2.

[0047] In some embodiments, in the second direction Z, the first connection portion 21 is inserted into the corresponding positioning groove 111 to a depth greater than or equal to 5 mm; and / or the second connection portion 22 is inserted into the corresponding positioning groove 111 to a depth greater than or equal to 5 mm. This insertion depth greater than or equal to 5 mm allows each connection portion (the first connection portion 21 and the second connection portion 22) to form a longer contact interface with the positioning groove 111 in the second direction Z. Under vibration or impact loads, the connection portion needs to overcome greater friction and material deformation resistance to disengage from the positioning groove 111, significantly reducing the risk of loosening or dislodging. In particular, when the battery module experiences frequent vibration (such as the bumps experienced during driving an electric vehicle), the connection portion is more difficult to dislodge from the positioning groove 111, thereby improving structural stability.

[0048] It is understood that the insertion depth of the first connection portion 21 into the corresponding positioning groove 111 is less than or equal to the dimension of the positioning groove 111 in the second direction Z. Furthermore, the insertion depth of the second connection portion 22 into the corresponding positioning groove 111 is less than or equal to the dimension of the positioning groove 111 in the second direction Z.

[0049] In some embodiments of the present application, the first connection portion 21 is welded or fixedly connected to the electrode 11 of one battery cell 1 by fasteners, and the second connection portion 22 is welded or fixedly connected to the electrode 11 of an adjacent battery cell 1 by fasteners. Welding utilizes high temperature or high pressure to melt or plastically deform the metal surfaces of the conductive bar 2 and the electrode 11, forming a continuous atomic bond between the metals with no mechanical gaps. After welding, the conductive bar 2 and the electrode 11 form a one-piece structure, eliminating issues such as bolt loosening or gasket fatigue and providing excellent long-term stability. Tightening fasteners (such as bolts) generates an axial preload, tightly pressing the connection portions (the first and second connection portions 21 and 22) against the electrode 11. During vibration, the preload prevents relative slippage or separation between the connection portion and the electrode 11, preventing loosening. Furthermore, loose fasteners can be directly tightened or replaced, minimizing maintenance time. During actual use, the connection method can be flexibly selected based on the stacking position of the battery cells 1, vibration intensity, and other factors.

[0050] Specifically, the first connecting portion 21 is welded to or fixedly connected with at least one of the first positioning portion 113 and the second positioning portion 114 of the pole 11 of one battery cell 1 by a fastener, and the second connecting portion 22 is welded to or fixedly connected with at least one of the first positioning portion 113 and the second positioning portion 114 of the pole 11 of an adjacent battery cell 1 by a fastener.

[0051] It should be noted that, in some embodiments, the first connecting portion 21 has an interference fit with the positioning groove 111 of the pole 11 of one battery cell 1, and is welded to the pole 11 or fixedly connected by a fastener. The second connecting portion 22 has an interference fit with the positioning groove 111 of the pole 11 of the adjacent battery cell 1, and is welded to the pole 11 or fixedly connected by a fastener. Thus, the interference fit serves as the first line of defense, significantly reducing the risk of misalignment during assembly and providing a stable foundation for subsequent fixing methods. The welded connection enhances metallurgical-grade stability and electrical performance, while the fastener connection provides maintainability and process flexibility. The double fixation significantly improves the robustness of the connection through functional complementarity, meeting the high reliability requirements of automotive grade.

[0052] In some embodiments of the present application, Figure 1 As shown, the battery module also has a third direction Y, and the second direction Z, the first direction X, and the third direction Y intersect in pairs. Each battery cell 1 includes an end cap 12 located on the same side in the second direction Z. There are two poles 11, namely a positive pole 11a and a negative pole 11b. Each end cap 12 is provided with a positive pole 11a and a negative pole 11b spaced apart along the third direction Y. The positive pole 11a on one battery cell 1 and the negative pole 11b on an adjacent battery cell 1 are arranged opposite each other in the first direction X. The conductive bar 2 (such as an aluminum bar) can directly connect the positive pole 11a and the negative pole 11b of adjacent battery cells 1 horizontally along the first direction X without detours or bends, thereby reducing the current transmission distance, lowering line impedance and heat risk, and improving electrical efficiency.

[0053] For example, the positive and negative electrode posts 11 of adjacent battery cells 1 are arranged in opposite directions. The positive electrode post 11a of a battery cell 1 is arranged near one side of the battery cell 1 in the third direction Y, and the negative electrode post 11b is arranged near the other side of the battery cell 1 in the third direction Y. Then, the negative electrode post 11b of the adjacent battery cell 1 is arranged near one side of the battery cell 1 in the third direction Y, and the positive electrode post 11a is arranged near the other side of the battery cell 1 in the third direction Y. Furthermore, one side of each battery cell 1 is located on the same side in the third direction Y, and the other side is also located on the same side in the third direction Y.

[0054] Please continue to refer to Figure 1In this embodiment, an explosion-proof valve 13 is provided on the end cap 12 of each battery cell 1. The explosion-proof valve 13 is located between the positive electrode post 11a and the negative electrode post 11b of the corresponding battery cell 1. Gas production inside the battery cell 1 (such as side reactions caused by overcharging or short circuit) usually first accumulates pressure near the electrode post 11. The present application disposes the explosion-proof valve 13 between the positive electrode post 11a and the negative electrode post 11b, so that it is directly located on the key path for releasing pressure inside the battery cell 1. It can quickly sense and respond to the increase in internal pressure, shorten the pressure relief response time, and avoid pressure accumulation causing shell rupture. At the same time, it can also prevent the airflow from directly impacting the electrode post 11 or the conductive bar 2 of the battery cell 1, reduce the risk of secondary damage to surrounding components, and improve the overall safety of the battery module.

[0055] like Figure 1 and Figure 8 As shown, the battery module also includes an insulating member 3, which is disposed on at least one side of the battery cells 1 in the first direction X. During the stacking process, the insulating member 3 acts as a physical barrier, blocking the direct conductive path between adjacent battery cells 1. This prevents the risk of short circuits between the end caps 12 (housings) of adjacent battery cells 1, significantly improving safety in high-vibration environments (such as those encountered in electric vehicle driving). For example, an insulating member 3 is disposed between every two adjacent battery cells 1.

[0056] Optionally, the insulating member 3 is a compressed insulating sheet. That is, the insulating member 3 typically has a certain degree of elasticity or flexibility. The compressed insulating sheet applies uniform pressure to the cell stack structure through its rebound force, helping to fix the position of the cell 1 and prevent the stack from loosening. At the same time, the friction between the insulating sheet and the contact surface is enhanced to prevent displacement. At the same time, the compressed insulating sheet applies uniform pressure to the cell 1 through the material rebound force, maintaining the stability of the cell stack structure over a long period of time and preventing displacement of the cell 1 or loosening of the insulating sheet due to vibration or thermal cycling.

[0057] In some embodiments of the present application, a plurality of battery cells 1 arranged in sequence along a first direction X constitute a battery cell group, and the battery module further comprises two end plates 4 and a fixing member 5, wherein one of the two end plates 4 is arranged on one side of the battery cell group in the first direction X, and the other end plate 4 is arranged on the other side of the battery cell group in the first direction X. The fixing member 5 fixedly connects the two end plates 4. During the driving of electric vehicles, the operation or transportation of energy storage systems, the battery module will face complex working conditions such as high-frequency vibration, impact or extrusion (such as road bumps, collision impact, etc.). At this time, the end plates 4 located at both ends of the battery module serve as rigid boundary structures, which can effectively disperse and absorb external mechanical stress, thereby avoiding safety hazards such as loosening of the pole 11, damage to the box or leakage of internal electrolyte due to vibration of the battery cell 1.

[0058] Specifically, when the battery module is installed in the battery pack casing or subjected to external loads (such as continuous vibration during vehicle operation), the two end plates 4, with their high-strength structure, maintain the stability of the cell stack, preventing it from tilting, misalignment, or collapse. This design not only ensures the precise alignment of the cell 1 pole 11 and the conductive bar 2 (such as an aluminum bar), but also ensures the long-term reliability of the electrical connection, providing key support for the efficient and safe operation of the battery module.

[0059] For example, the fixing member 5 is a steel tie, which is sleeved around the outer periphery of the two end plates 4. The tie can be quickly tightened manually or with pneumatic tools, eliminating the need for complex assembly tooling, significantly improving production line efficiency and making it suitable for large-scale mass production. Furthermore, when the tie is tightened, its tension is evenly transmitted to each end plate 4 and battery cell 1, ensuring that the battery cells 1 are tightly stacked and prevented from loosening or shifting. This is particularly effective in distributing stress when the battery cells 1 expand.

[0060] In other embodiments, the fixing member 5 is a binding rope, which is tied to the outer periphery of the two end plates 4 to limit the lateral displacement of the end plates 4 under vibration or impact, thereby preventing the battery cell stacking structure from tilting or collapsing.

[0061] In some embodiments of the present application, a battery pack is provided, comprising a housing and a battery module as described in any of the above technical solutions, the battery module being installed within the housing. Because the battery module within the battery pack shares the same technical features as the above battery module, both can solve the same technical problems and achieve the same technical effects.

[0062] In some embodiments of the present application, a vehicle is provided, comprising a battery pack as described in any of the above technical solutions. Because the battery module in the battery pack of the vehicle has the same technical features as the above battery module, the two can solve the same technical problems and achieve the same technical effects.

[0063] In the description of this specification, specific features, structures, materials or characteristics may be combined in an appropriate manner in any one or more embodiments or examples.

[0064] The above is only a specific embodiment of the present application, but the scope of protection of the present application is not limited thereto. Any person skilled in the art can easily think of changes or replacements within the technical scope disclosed in the present application, which should be included in the scope of protection of the present application. Therefore, the scope of protection of the present application should be based on the scope of protection of the claims. In addition, the specification uses specific examples to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the method and core ideas of the present application. The content of this specification should not be understood as limiting the present application.

Claims

1. A battery module, characterized in that: The battery module has a first direction and a second direction intersecting each other, and the battery module includes: A plurality of battery cells stacked along the first direction, each of the battery cells being provided with a pole on one side in the second direction, and each pole being provided with a positioning groove; A plurality of conductive bars, at least one of which connects two poles of different polarities of adjacent battery cells, the conductive bar having a first connecting portion and a second connecting portion connected to each other, the first connecting portion being located in the positioning groove of the pole of one battery cell, and the second connecting portion being located in the positioning groove of the pole of an adjacent battery cell.

2. The battery module according to claim 1, wherein: Each of the battery cells includes an end cover, and the pole includes a body and a first positioning portion and a second positioning portion connected to the body. The body is passed through the end cover, and the first positioning portion and the second positioning portion are spaced apart in the first direction to form the positioning groove.

3. The battery module according to claim 2, characterized in that: The first positioning portion is a first conductive spring piece, the second positioning portion is a second conductive spring piece, and the first conductive spring piece and the second conductive spring piece are both conductively connected to the body on the same side in the second direction.

4. The battery module according to any one of claims 1 to 3, characterized in that: The conductive bar further includes a main body portion connected between the first connecting portion and the second connecting portion, and the first connecting portion and the second connecting portion are both bent relative to the main body portion.

5. The battery module according to claim 4, characterized in that: The first connecting portion is interference-fitted with the positioning groove of the pole of one battery cell, and the second connecting portion is interference-fitted with the positioning groove of the pole of an adjacent battery cell.

6. The battery module according to claim 5, characterized in that: The dimension of the first connecting portion in the first direction is D1, the dimension of the positioning groove in the first direction is D2, and the following conditions are satisfied: D1=(1.3-1.5)×D2.

7. The battery module according to any one of claims 1 to 3, characterized in that: In the second direction, the first connecting portion is inserted into the corresponding positioning groove to a depth greater than or equal to 5 mm in the second direction; and / or the second connecting portion is inserted into the corresponding positioning groove to a depth greater than or equal to 5 mm in the second direction.

8. The battery module according to claim 1, wherein: The first connection portion is connected to the pole of one battery cell by welding or fixedly connected by a fastener, and the second connection portion is connected to the pole of an adjacent battery cell by welding or fixedly connected by a fastener.

9. The battery module according to claim 1, wherein: The battery module further has a third direction, and the second direction, the first direction and the third direction intersect with each other; Each of the battery cells includes an end cover located on the same side in the second direction, and there are two poles, namely a positive pole and a negative pole. Each of the end covers is provided with the positive pole and the negative pole arranged at intervals along the third direction, and the positive pole on one battery cell and the negative pole on the adjacent battery cell are arranged opposite to each other in the first direction.

10. The battery module according to claim 9, characterized in that: The end cover of each battery cell is provided with an explosion-proof valve, and the explosion-proof valve is located between the positive electrode column and the negative electrode column of the corresponding battery cell.

11. The battery module according to claim 1, wherein: The battery module further includes: An insulating member is provided on at least one side of the battery core in the first direction.

12. The battery module according to claim 1, wherein: A plurality of the battery cells sequentially arranged along the first direction constitute a battery cell group, and the battery module further includes: Two end plates, one of the two end plates is arranged on one side of the battery cell group in the first direction, and the other end plate is arranged on the other side of the battery cell group in the first direction; A fixing member fixedly connects the two end plates.

13. A battery pack, characterized in that: include: Box; as well as, The battery module according to any one of claims 1 to 12, wherein the battery module is installed in the box.

14. A vehicle, characterized in that: Comprising the battery pack as claimed in claim 13.

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