Battery module connecting structure and battery pack

Abstract

The utility model provides a battery module connecting structure and a battery pack, and relates to the technical field of batteries, a bridging copper bar comprises a copper bar body, the two ends of the copper bar body in the length direction are respectively provided with a connecting part, and the connecting parts are used for being electrically connected with electric connecting ends of battery modules. A plurality of elastic structures are arranged on the copper bar body along the length direction of the copper bar body, and the elastic structures are configured to enable the copper bar body to perform tiny relative displacement relative to the electric connection end of the battery module when the bridging copper bar is vibrated. Due to the fact that the elastic structure is arranged on the copper bar body, the copper bar can generate small displacement relative to the electric connecting end of the battery module under the vibration effect, the effective buffering effect is achieved, the situation that the connecting part is stressed excessively due to external vibration is avoided, loosening or falling of the connecting part at the electric connecting end is reduced, and the connecting reliability is enhanced.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, and in particular to a battery module connection structure and battery pack. Background Technology

[0002] With the rapid development of electric vehicles and energy storage devices, battery packs, as one of the core components, play a crucial role in providing power to vehicles or storing energy for the system. Multiple battery modules within a battery pack are typically electrically connected via copper busbars, which are widely used in battery pack design due to their excellent conductivity and high mechanical strength.

[0003] Due to the inherent high rigidity of copper busbars, the electrical connection between battery modules via copper busbars may cause certain mechanical problems. Especially during battery pack operation, dynamic operations such as vehicle driving, acceleration, and braking cause the battery pack to experience random vibrations in the XYZ three directions, with complex and random vibration frequencies. Due to the difference in mechanical strength between the copper busbars and battery modules, vibration causes the electrical connection points between the copper busbars and battery modules to vibrate at different frequencies and experience mutual tension. Long-term vibration may lead to torque attenuation of the bolt connections, bolt loosening, or even connector detachment, thus affecting the electrical performance of the battery pack and, in severe cases, causing battery pack failure or safety hazards. In particular, the long lateral bridging distance of the copper busbars and the vertical height difference of the battery modules result in a larger vibration amplitude of the copper busbars, further increasing the risk of bolt loosening, unraveling, or even detachment. Utility Model Content

[0004] In view of this, this utility model proposes a battery module connection structure and battery pack to solve the problem of the risk of copper busbars and battery module electrical connection points falling off due to vibration.

[0005] The technical solution of this utility model is implemented as follows:

[0006] In a first aspect, the present invention provides a crossover copper busbar, comprising a copper busbar body, wherein the copper busbar body has connecting portions at both ends along its length direction, the connecting portions being used for electrical connection with the electrical connection terminal of a battery module, and the copper busbar body having a plurality of elastic structures along its length direction, the elastic structures being configured such that when the crossover copper busbar is subjected to vibration, the copper busbar body can undergo a small relative displacement relative to the electrical connection terminal of the battery module.

[0007] Based on the above technical solution, preferably, the elastic structure is a protrusion formed by bending the copper busbar body along its length direction, and the shape of the protrusion is any one of n-type, M-type, V-type or W-type.

[0008] Secondly, this utility model provides a battery module connection structure, including a first battery module, a second battery module, and the crossover copper busbar mentioned in the first aspect. The second battery module is located on one side of the first battery module, and the top surface of the first battery module is higher than the top surface of the second battery module. The copper busbar body surrounds the outside of the first battery module, and the connecting parts at both ends of the copper busbar body are fixedly connected to the electrical connection ends of the first battery module and the second battery module, respectively.

[0009] Based on the above technical solution, preferably, the copper busbar body includes a first copper busbar segment, a second copper busbar segment, a third copper busbar segment, and a fourth copper busbar segment;

[0010] The ends of the first copper busbar segment and the second copper busbar segment are vertically connected. The third copper busbar segment is vertically connected to the end of the first copper busbar segment away from the second copper busbar segment. The fourth copper busbar segment is vertically connected to the end of the second copper busbar segment away from the first copper busbar segment. The third copper busbar segment is located above the first copper busbar segment, and the fourth copper busbar segment is located below the second copper busbar segment. The ends of the third copper busbar segment and the fourth copper busbar segment are respectively vertically connected to the connecting part.

[0011] The first and third copper busbar segments are attached to one end of the sidewall along the length of the first battery module. The connecting part at the end of the third copper busbar segment is fixedly connected to the electrical connection end of the first battery module. The second and fourth copper busbar segments are attached to the side of the first battery module facing the second battery module. The connecting part of the fourth copper busbar segment is fixedly connected to the electrical connection end of the second battery module.

[0012] Thirdly, this utility model discloses a battery pack, including a housing and a battery module connection structure as described in the second aspect disposed within the housing, and further including a third battery module fixedly disposed within the housing, wherein the first battery module is fixedly disposed on the top surface of the third battery module, and the top surface of the third battery module is flush with the top surface of the second battery module.

[0013] Based on the above technical solution, preferably, it also includes a support component fixedly disposed between the first battery module and the second battery module. The first copper busbar segment and the second copper busbar segment surround two adjacent side walls of the support component. A plurality of buckles are provided on the side walls of the support component, and the first copper busbar segment and the second copper busbar segment are respectively engaged in the buckles.

[0014] Based on the above technical solution, preferably, the support component includes a liquid cooling plate and a frame fixedly disposed on the top surface of the liquid cooling plate. The first battery module is fixedly installed inside the frame, and the bottom surface of the first battery module is in contact with the liquid cooling plate. Several buckles are respectively fixed to one side of the frame in the length direction and the adjacent side in the width direction.

[0015] Based on the above technical solution, preferably, it also includes fixed end plates, which are located at both ends of the length direction of the third battery module and are fixedly connected to the housing. The two ends of the liquid cooling plate are fixedly connected to the fixed end plates.

[0016] Based on the above technical solution, preferably, it also includes fixing columns, which are located on both sides of the width direction of the third battery module. The lower end of the fixing column is fixedly connected to the housing, and the upper end of the fixing column is fixedly connected to the liquid cooling plate.

[0017] Based on the above technical solution, preferably, multiple second battery modules are provided, and the multiple second battery modules are fixedly arranged in the housing at intervals along the length direction of the third battery module, and the second battery modules are perpendicular to the third battery module.

[0018] The present invention has the following advantages over the prior art:

[0019] (1) Because the copper busbar is equipped with an elastic structure, the copper busbar can undergo a small displacement relative to the electrical connection end of the battery module under vibration, which plays an effective buffering role, avoids excessive force on the connection part due to external vibration, thereby reducing the loosening or falling off of the connection part at the electrical connection end and enhancing the reliability of the connection.

[0020] (2) By setting the elastic structure as a protrusion formed by bending the copper busbar body along its length, this structure can cause the crossover copper busbar to undergo elastic deformation when subjected to external vibration, thus forming an elastic effect. The presence of the protrusion allows the copper busbar to deform to a certain extent when vibrating, thereby effectively absorbing vibration energy and reducing the impact on the electrical connection.

[0021] (3) By connecting the entire copper busbar body into four copper busbar segments at different angles, the copper busbar body has three directions in space. The first copper busbar segment is located in the X direction, the second copper busbar segment is located in the Y direction, and the third and fourth copper busbar segments are located in the Z direction. By setting elastic structures on these copper busbar segments, these elastic structures can absorb the energy of random vibration in the XYZ directions, thereby improving the mode of the battery pack, reducing the risk of the connection part and the electrical connection end of the battery module falling off, and reducing the risk of the copper busbar hitting the module when vibrating in the XY direction.

[0022] (4) By setting a buckle on the side wall of the support component, the first copper busbar segment and the second copper busbar segment are engaged in the buckle. The first copper busbar segment and the second copper busbar segment will not detach from the support component. However, when subjected to mechanical vibration, due to the action of the elastic structure, the first copper busbar segment and the second copper busbar segment can be displaced in the horizontal direction, so that the first copper busbar segment and the second copper busbar segment can move in the horizontal direction relative to the buckle. While achieving buffer energy absorption, the impact of the first copper busbar segment and the second copper busbar segment on the first battery module is avoided. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 This is a three-dimensional structural diagram of the crossover copper busbar disclosed in this utility model;

[0025] Figure 2 This is a schematic diagram of an elastic structure disclosed in this utility model.

[0026] Figure 3 This is a schematic diagram of an elastic structure disclosed in this utility model.

[0027] Figure 4 This is a schematic diagram of an elastic structure disclosed in this utility model.

[0028] Figure 5 This is a three-dimensional structural diagram of the battery module connection structure disclosed in this utility model.

[0029] Figure 6 This is a front view of the battery module connection structure disclosed in this utility model;

[0030] Figure 7 This is a schematic diagram of the assembly structure of the support component and the bridging copper busbar disclosed in this utility model;

[0031] Figure 8 This is a three-dimensional structural diagram of the battery pack disclosed in this utility model;

[0032] Figure label:

[0033] 1. Bridging copper busbar; 11. Copper busbar body; 12. Connecting part; 13. Elastic structure; 2. First battery module; 3. Second battery module; 111. First copper busbar section; 112. Second copper busbar section; 113. Third copper busbar section; 114. Fourth copper busbar section; 4. Housing; 5. Third battery module; 6. Support assembly; 61. Liquid cooling plate; 62. Enclosure frame; 63. Buckle; 7. Fixed end plate; 8. Fixed column. Detailed Implementation

[0034] The technical solutions of this utility model will be clearly and completely described below with reference to the embodiments of this utility model. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. Based on the embodiments of this utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of this utility model.

[0035] like Figure 1 As shown, combined with Figure 2-5 This utility model embodiment discloses a crossover copper busbar, including a copper busbar body 11. The copper busbar body 11 is the main part of the crossover copper busbar 1, has a certain length, and has connecting parts 12 at both ends. These connecting parts 12 are used to make electrical connections with the electrical connection terminals of the battery module.

[0036] The electrical connection point in the above embodiments refers to the electrical contact point with the battery module, which is usually connected to the copper busbar by welding, bolting or other electrical connection methods.

[0037] The copper busbar body 11 disclosed in this embodiment has a plurality of elastic structures 13 arranged along its length direction. The elastic structures 13 are configured such that when the bridging copper busbar 1 is subjected to vibration, the copper busbar body 11 can make a small relative displacement relative to the electrical connection terminal of the battery module.

[0038] Because the copper busbar body 11 is provided with an elastic structure 13, the copper busbar can undergo a slight displacement relative to the electrical connection end of the battery module under vibration, which plays an effective buffering role, avoids excessive force on the connection part 12 due to external vibration, thereby reducing the loosening or detachment of the connection part 12 at the electrical connection end and enhancing the reliability of the connection.

[0039] This embodiment proposes a structural form of elastic structure 13. Specifically, elastic structure 13 is a protrusion formed by bending the copper busbar body 11 along its length. This structural arrangement allows the bridging copper busbar 1 to undergo elastic deformation when subjected to external vibration, thus creating an elastic effect. The presence of the protrusion allows the copper busbar to deform to a certain extent during vibration, thereby effectively absorbing vibration energy and reducing the impact on the electrical connection terminals.

[0040] As some implementation methods, see the appendix. Figure 1-4 As shown, the protrusions can be any of the following shapes: n-shaped, M-shaped, V-shaped, or W-shaped. Specifically, N-shaped and M-shaped protrusions typically have a larger deformation space and can provide higher elastic recovery force after being subjected to force. V-shaped and W-shaped structures, due to their sharp bending shape, can quickly return to their original shape under smaller vibration amplitudes and are suitable for more frequent small-amplitude vibrations. By selecting protrusions of different shapes, the elastic performance of the copper busbar can be optimized according to the actual usage scenario (such as vibration frequency, amplitude, etc.).

[0041] This utility model embodiment also provides a battery module connection structure, as shown in the attached drawing. Figure 5 and 6 As shown, the device includes a first battery module 2, a second battery module 3, and a crossover copper busbar 1 disclosed in the above embodiment. The second battery module 3 is located on one side of the first battery module 2, and the top surface of the first battery module 2 is higher than the top surface of the second battery module 3. The copper busbar body 11 surrounds the outside of the first battery module 2, and the connecting portions 12 at both ends of the copper busbar body 11 are fixedly connected to the electrical connection ends of the first battery module 2 and the second battery module 3, respectively.

[0042] By surrounding the copper busbar body 11 around the outside of the first battery module 2, the large space occupied by the bridging copper busbar 1 between the first battery module 2 and the second battery module 3 can be avoided. Simultaneously, surrounding the first battery module 2 enhances the stability of the bridging copper busbar 1 structure. In this embodiment, the top surface of the second battery module 3 is lower than the top surface of the first battery module 2, creating a relative positional difference between the two in the vertical direction, thus adapting to the structural requirements of customized battery packs. The function of the bridging copper busbar 1 is to realize current transmission between battery modules, and its elastic structure 13 is designed to adapt to vibration and mechanical shock, ensuring the stability of the electrical connection between battery modules.

[0043] In order to achieve an effective electrical connection between the bridging copper busbar 1 and the first battery module 2 and the second battery module 3, this embodiment shows a preferred structural configuration of the copper busbar body 11.

[0044] For details, please refer to the appendix. Figure 1 As shown, the copper busbar body 11 includes a first copper busbar segment 111, a second copper busbar segment 112, a third copper busbar segment 113, and a fourth copper busbar segment 114. The ends of the first copper busbar segment 111 and the second copper busbar segment 112 are vertically connected, forming a 90° angle between them, which facilitates the first copper busbar segment 111 and the second copper busbar segment 112 surrounding two adjacent sidewalls of the first battery module 2.

[0045] The third copper busbar segment 113 is perpendicularly connected to the end of the first copper busbar segment 111 away from the second copper busbar segment 112. The third copper busbar segment 113 is located above the first copper busbar segment 111, and the end of the third copper busbar segment 113 is perpendicularly connected to the connecting part 12. Thus, the first copper busbar segment 111 and the third copper busbar segment 113 are attached to the side wall of one end of the length direction of the first battery module 2. At the same time, the third copper busbar segment 113 is vertically located above the first copper busbar segment 111. This facilitates the connection part 12 at the top of the third copper busbar segment 113 to be fixedly installed with the electrical connection end of the first battery module 2.

[0046] The fourth copper busbar segment 114 is vertically connected to the end of the second copper busbar segment 112 away from the first copper busbar segment 111. The fourth copper busbar segment 114 is located below the second copper busbar segment 112, and its end is vertically connected to the connecting portion 12. With this configuration, the second copper busbar segment 112 and the fourth copper busbar segment 114 are attached to the side of the first battery module 2 facing the second battery module 3, while the fourth copper busbar segment 114 is vertically located below the second copper busbar segment 112. This facilitates the fixed installation of the connecting portion 12 at the end of the fourth copper busbar segment 114 to the electrical connection terminal of the second battery module 3.

[0047] It should be noted that the electrical connection terminals of the first battery module 2 and the second battery module 3 are both located on the top surface. Since the top surface of the first battery module 2 is higher than that of the second battery module 3, the third copper busbar segment 113 is located above the first copper busbar segment 111, and the fourth copper busbar segment 114 is located below the second copper busbar segment 112. This allows the third copper busbar segment 113 and the fourth copper busbar segment 114 to have a certain height difference in the vertical direction, which helps to optimize space utilization and enables the two battery modules with a height difference to be effectively electrically connected.

[0048] In the above embodiment, the elastic structure 13 is disposed on the first copper busbar segment 111, the second copper busbar segment 112, the third copper busbar segment 113, and the fourth copper busbar segment 114. Since the entire copper busbar body 11 is composed of four copper busbar segments connected at different angles, the copper busbar body 11 has three directions in space. Specifically, the first copper busbar segment 111 is located in the X direction, the second copper busbar segment 112 is located in the Y direction, and the third copper busbar segment 113 and the fourth copper busbar segment 114 are located in the Z direction. By disposing of the elastic structure 13 on these copper busbar segments, these elastic structures 13 can absorb the energy of random vibration in the XYZ directions, thereby improving the mode of the battery pack, reducing the risk of the electrical connection terminals of the connection part 12 and the battery module falling off, and reducing the risk of the copper busbar hitting the module during XY direction vibration.

[0049] This utility model embodiment also provides a battery pack, as shown in the attached drawing. Figure 8 As shown, the battery pack includes a housing 4 and the battery module connection structure disclosed in the above embodiment. The battery module connection structure is disposed inside the housing 4. The first battery module 2 is higher than the second battery module 3 inside the housing 4. This is to make the top surface of the entire battery pack not flat, but with a certain drop, so that the battery pack forms a customized structure to adapt to the specific installation space of the vehicle.

[0050] To ensure the first battery module 2 is securely fixed inside the housing 4, and that its top surface is higher than the top surface of the second battery module 3, this embodiment also includes a third battery module 5 fixedly mounted inside the housing 4. The first battery module 2 is fixedly mounted on the top surface of the third battery module 5. This allows the first battery module 2 to be raised via the third battery module 5, making its top surface higher than the second battery module 3. Furthermore, the presence of two layers of battery modules vertically within the housing 4 increases the energy density of the battery pack. In this embodiment, the top surface of the third battery module 5 is flush with the top surface of the second battery module 3. This structural arrangement ensures that all battery modules have the same height, facilitating installation inside the housing 4.

[0051] In order to fix the first battery module 2 on the top surface of the third battery module 5, the battery pack disclosed in this embodiment is provided with a support component 6 between the first battery module 2 and the third battery module 5. Specifically, the first battery module 2 is fixedly connected to the third battery module 5 through the support component 6.

[0052] In this embodiment, the bridging copper busbar 1 needs to establish an electrical connection between the first battery module 2 and the second battery module 3. Although the copper busbar body 11 can surround the outside of the first battery module 2, when vibration occurs during the use of the battery pack, the copper busbar body 11 will impact the first battery module 2, thereby causing damage to the first battery module 2.

[0053] Therefore, in this embodiment, the first copper busbar segment 111 and the second copper busbar segment 112 are arranged around two adjacent sidewalls of the support component 6. Several latches 63 are provided on the sidewalls of the support component 6, and the first copper busbar segment 111 and the second copper busbar segment 112 are respectively latched into the latches 63. With this arrangement, by providing latches 63 on the sidewalls of the support component 6, the first copper busbar segment 111 and the second copper busbar segment 112 are latched into the latches 63, preventing them from detaching from the support component 6. However, when subjected to mechanical vibration, due to the action of the elastic structure 13, the first copper busbar segment 111 and the second copper busbar segment 112 can undergo a certain displacement in the horizontal direction, allowing them to move horizontally relative to the latches 63. This achieves buffering and energy absorption while preventing the first copper busbar segment 111 and the second copper busbar segment 112 from impacting the first battery module 2.

[0054] This embodiment illustrates a preferred structural configuration of the support component 6. For details, please refer to the appendix. Figure 7As shown, the support component 6 includes a liquid cooling plate 61 and a frame 62 fixedly disposed on the top surface of the liquid cooling plate 61. The first battery module 2 is fixedly installed inside the frame 62, and the bottom surface of the first battery module 2 is in contact with the liquid cooling plate 61. Several buckles 63 are respectively fixed on one side of the frame 62 in the length direction and on the adjacent side in the width direction.

[0055] With this configuration, the first battery module 2 is fixedly installed within the frame 62. The frame 62 can fix the position of the first battery module 2 in the horizontal direction. At the same time, the liquid cooling plate 61 is in contact with the bottom surface of the first battery module 2, allowing heat exchange between the first battery module 2 and the liquid cooling plate 61. By fixing the buckle 63 to one side of the length direction and the adjacent side of the width direction of the frame 62, the first copper busbar segment 111 and the second copper busbar segment 112 can be constrained to the side wall of the frame 62 by the buckle 63, preventing the first copper busbar segment 111 and the second copper busbar segment 112 from directly contacting the side wall of the first battery module 2, thereby preventing the first copper busbar segment 111 and the second copper busbar segment 112 from impacting the first battery module 2 when subjected to vibration in the XY direction.

[0056] In this embodiment, in order to enable the first battery module 2 to be fixed on the top surface of the third battery module 5, and to avoid the weight of the first battery module 2 being entirely loaded onto the third battery module 5, a fixed end plate 7 is also provided. The fixed end plate 7 is located at both ends of the length direction of the third battery module 5, and the fixed end plate 7 is fixedly connected to the housing 4. Both ends of the liquid cooling plate 61 are fixedly connected to the fixed end plate 7.

[0057] With this configuration, the first battery module 2 is fixedly installed in the frame 62 and supported by the liquid cooling plate 61. The liquid cooling plate 61 is horizontally located on the top surface of the two fixed end plates 7. The liquid cooling plate 61 and the fixed end plates 7 are fixedly connected, so that the third battery module 5 can be located between the liquid cooling plate 61 and the housing 4, thereby avoiding the weight loading on the top surface of the third battery module 5 and reducing the impact of vibration on the third battery module 5.

[0058] To further secure the liquid cooling plate 61 within the housing 4, the battery pack in this embodiment also includes fixing posts 8. The fixing posts 8 are located on both sides of the width direction of the third battery module 5. The lower end of the fixing posts 8 is fixedly connected to the housing 4, and the upper end of the fixing posts 8 is fixedly connected to the liquid cooling plate 61. Specifically, the fixing posts 8 are located in the middle of the length direction of the third battery module 5. In this way, by supporting the middle sides of the liquid cooling plate 61 with the supporting posts, and with the support and fixation of the fixing end plate 7, the entire liquid cooling plate 61 can have multiple support points within the housing 4, preventing the liquid cooling plate 61 from deforming downwards, ensuring that the liquid cooling plate 61 can stably and reliably provide support for the first battery module 2, and also improving the structural stability of the entire battery pack.

[0059] In this embodiment, multiple second battery modules 3 are provided, and these modules are fixedly arranged at intervals along the length of the third battery module 5 within the housing 4, with the second battery modules 3 perpendicular to the third battery module 5. This structural arrangement allows the multiple second battery modules 3, arranged along the length of the third battery module 5, to fully utilize the internal space of the housing 4 and create a height difference between the first battery module 2 and the second battery module 3, resulting in an irregularly shaped battery pack with a height difference, thus adapting to special installation scenarios.

[0060] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A battery module connection structure, characterized in that, The device includes a first battery module (2), a second battery module (3), and a bridging copper busbar (1). The bridging copper busbar (1) includes a copper busbar body (11). The copper busbar body (11) has connecting portions (12) at both ends along its length. The connecting portions (12) are used to make electrical connections with the electrical connection terminals of the battery module. The copper busbar body (11) has several elastic structures (13) along its length. The elastic structures (13) are configured so that when the bridging copper busbar (1) is vibrated, the copper busbar body (11) can make a small relative displacement relative to the electrical connection terminals of the battery module. The second battery module (3) is located on one side of the first battery module (2), and the top surface of the first battery module (2) is higher than the top surface of the second battery module (3). The copper busbar body (11) surrounds the outside of the first battery module (2), and the connecting parts (12) at both ends of the copper busbar body (11) are fixedly connected to the electrical connection ends of the first battery module (2) and the second battery module (3), respectively. The copper busbar body (11) includes a first copper busbar segment (111), a second copper busbar segment (112), a third copper busbar segment (113), and a fourth copper busbar segment (114); The ends of the first copper busbar segment (111) and the second copper busbar segment (112) are vertically connected. The third copper busbar segment (113) is vertically connected to the end of the first copper busbar segment (111) away from the second copper busbar segment (112). The fourth copper busbar segment (114) is vertically connected to the end of the second copper busbar segment (112) away from the first copper busbar segment (111). The third copper busbar segment (113) is located above the first copper busbar segment (111), and the fourth copper busbar segment (114) is located below the second copper busbar segment (112). The ends of the third copper busbar segment (113) and the fourth copper busbar segment (114) are vertically connected to the connecting part (12) respectively. The first copper busbar segment (111) and the third copper busbar segment (113) are attached to one side wall of the first battery module (2) along its length. The connecting part (12) at the end of the third copper busbar segment (113) is fixedly connected to the electrical connection end of the first battery module (2). The second copper busbar segment (112) and the fourth copper busbar segment (114) are attached to the side of the first battery module (2) facing the second battery module (3). The connecting part (12) of the fourth copper busbar segment (114) is fixedly connected to the electrical connection end of the second battery module (3).

2. The battery module connection structure as described in claim 1, characterized in that: The elastic structure (13) is a protrusion formed by bending the copper busbar body (11) along its length direction. The shape of the protrusion is any one of n-type, M-type, V-type or W-type.

3. A battery pack, comprising a housing (4) and a battery module connection structure as described in claim 1 or 2 disposed inside the housing (4), characterized in that, It also includes a third battery module (5) fixedly installed inside the housing (4), the first battery module (2) is fixedly installed on the top surface of the third battery module (5), and the top surface of the third battery module (5) is flush with the top surface of the second battery module (3).

4. The battery pack as described in claim 3, characterized in that: It also includes a support assembly (6) fixedly disposed between the first battery module (2) and the third battery module (5). The first copper busbar segment (111) and the second copper busbar segment (112) surround two adjacent side walls of the support assembly (6). Several buckles (63) are provided on the side walls of the support assembly (6). The first copper busbar segment (111) and the second copper busbar segment (112) are respectively snapped into the buckles (63).

5. The battery pack as described in claim 4, characterized in that: The support component (6) includes a liquid cooling plate (61) and a frame (62) fixedly disposed on the top surface of the liquid cooling plate (61). The first battery module (2) is fixedly installed inside the frame (62), and the bottom surface of the first battery module (2) is in contact with the liquid cooling plate (61). Several buckles (63) are respectively fixed on one side of the length direction of the frame (62) and the side of the width direction adjacent to it.

6. The battery pack as described in claim 5, characterized in that: It also includes a fixed end plate (7), which is located at both ends of the length direction of the third battery module (5) and is fixedly connected to the housing (4). The two ends of the liquid cooling plate (61) are fixedly connected to the fixed end plate (7).

7. The battery pack as described in claim 6, characterized in that: It also includes a fixing post (8), which is located on both sides of the width direction of the third battery module (5). The lower end of the fixing post (8) is fixedly connected to the housing (4), and the upper end of the fixing post (8) is fixedly connected to the liquid cooling plate (61).

8. The battery pack as described in claim 3, characterized in that, The second battery module (3) is provided in multiple ways. Multiple second battery modules (3) are fixedly arranged in the housing (4) at intervals along the length direction of the third battery module (5), and the second battery modules (3) are perpendicular to the third battery module (5).

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