Battery box and energy storage device

Abstract

The utility model discloses a battery box and an energy storage device, the battery box comprises a box body, a mounting rack and a confluence assembly, the box body is provided with a fixed cavity and an opening communicated with the fixed cavity, and the fixed cavity is used for storing a battery pack; the mounting frame is arranged in the fixing cavity and is used for placing the battery pack; the confluence assembly is in insulation connection with the box body or the installation frame, and the confluence assembly is used for elastically abutting against an output terminal of the battery pack, and aims to solve the technical problem of how to maintain stable overcurrent between the battery pack and the busbar.

Description

TECHNICAL FIELD

[0001] The utility model relates to battery box technical field especially relates to a battery box and energy storage device. BACKGROUND

[0002] In modern battery boxes, the connection method of battery packs and busbars is crucial. Battery packs, as the core components of energy storage, bear the mission of providing power. The busbar is responsible for effectively distributing the output current of the battery pack to the entire system. The traditional connection method mainly uses screws for direct fixation, which is simple and fast during manufacturing and installation, but has many potential problems in actual application, especially in high-energy-density battery systems.

[0003] After screwing, the phenomenon of screw back often occurs, which leads to a significant increase in the contact resistance of the connection. When the internal resistance increases, more heat is generated when the current flows through the connection point, causing the temperature of the connection to rise. The temperature rise not only causes the performance of the battery to decline, but also may cause the battery pack to overheat, thereby affecting the sustained overcurrent capacity and service life of the battery. In addition, long-term temperature fluctuations and internal resistance changes may cause fatigue damage to the connection point, increasing the risk of system failure.

[0004] Therefore, for battery boxes, the traditional screw connection method cannot meet the needs of high-energy-density batteries under extreme working conditions. How to maintain stable overcurrent between the battery pack and the busbar is imminent. SUMMARY

[0005] One purpose of the utility model is to provide a battery box and energy storage device, which aims to solve the technical problem of how to maintain stable overcurrent between the battery pack and the busbar.

[0006] To achieve the above purpose, the utility model provides a scheme:

[0007] A battery box, the battery box includes a box body, a fixed cavity and an opening communicating with the fixed cavity are opened, the fixed cavity is used for storing a battery pack; a mounting bracket is arranged in the fixed cavity, the mounting bracket is used for placing the battery pack; a busbar assembly is insulatedly connected with the box body or the mounting bracket, the busbar assembly is used for elastically abutting the output terminal of the battery pack.

[0008] Optionally, the busbar assembly includes a busbar, a spring, a spring and an insulating column, the busbar is connected with the mounting bracket through the insulating column, the spring includes a fixed end and a free end connected with each other, the fixed end is fixedly connected with the busbar, the free end is arranged in the busbar, the spring is elastically compressed between the free end and the busbar, the spring is used for elastically abutting the output terminal of the battery pack.

[0009] Optionally, the busbar assembly also includes a limiting member. A first limiting hole is provided on the busbar, and the limiting member passes through the first limiting hole and is connected to the busbar. The limiting member is used to connect to the output terminal of the battery pack to keep the spring contact against the output terminal of the battery pack.

[0010] Optionally, the mounting frame includes multiple crossbeams, multiple longitudinal beams, and multiple placement plates. The multiple crossbeams are spaced apart on the housing along the height direction of the housing, and the multiple longitudinal beams are fixedly connected to the crossbeams at intervals. The longitudinal beams extend along the height direction of the housing, and the placement plates are fixed on the longitudinal beams to hold the battery pack.

[0011] Optionally, the longitudinal beam has multiple fixing holes along the height direction of the box body, and the placement plate is connected to at least one of the fixing holes by fasteners.

[0012] To achieve the above objectives, the present invention provides the following solution:

[0013] An energy storage device includes multiple battery packs and the aforementioned battery box, wherein the multiple battery packs are disposed in the battery box.

[0014] Optionally, the battery pack includes multiple cell modules, a housing, and output terminals. The multiple cell modules are disposed in the housing, the housing is connected to the mounting bracket, and the multiple cell modules are electrically connected to the output terminals respectively. The output terminals are elastically abutted against the busbar assembly.

[0015] Optionally, a second limiting hole is provided on the output terminal, and the bus assembly passes through the second limiting hole and connects to the output terminal.

[0016] Optionally, the battery cell module includes an end plate, a side plate, multiple battery cells, and a heat sink. The multiple battery cells and the heat sink are arranged alternately in sequence to form a battery cell unit. The end plate is located at both ends of the battery cell unit, and the side plate is located on the side of the battery cell unit and connected to the end plate.

[0017] Optionally, the side plate includes a rigid section and an elastic section connected to each other, and the end plate has a mounting groove. The rigid section fits into the battery cell unit, and the elastic section passes through the mounting groove and is fixed by fasteners. The elastic section is in a folded state.

[0018] The beneficial effects of this utility model are as follows:

[0019] Compared to existing technologies, this application abandons the traditional bolted connection method to avoid the potential for unwinding after bolt locking. This phenomenon often leads to poor contact at the connection point, increasing contact resistance and affecting current stability and flow efficiency. Instead, this application employs an elastic support method. Through the action of elasticity, the bus assembly maintains a tight contact with the output terminal, ensuring stable current flow during transmission and effectively reducing heat generation caused by poor contact. Furthermore, the elastic connection reduces mechanical stress while adapting to a certain range of displacement and vibration. In practical applications, even under harsh working conditions, the connection remains reliable. Attached Figure Description

[0020] 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 the structures shown in these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of the battery box provided in an embodiment of the present invention;

[0022] Figure 2 This is a connection diagram of the busbar assembly provided in an embodiment of the present invention;

[0023] Figure 3 This is a schematic diagram of the structure of the bus assembly provided in this embodiment of the utility model;

[0024] Figure 4 This is a schematic diagram of the energy storage device provided in an embodiment of the present invention;

[0025] Figure 5 This is an overall schematic diagram of the battery pack provided in an embodiment of the present utility model;

[0026] Figure 6 This is a side view of the battery pack provided in an embodiment of the present invention;

[0027] Figure 7 This is a schematic diagram of the internal structure of the battery pack provided in an embodiment of the present invention;

[0028] Figure 8 This is a schematic diagram of the battery cell module provided in an embodiment of the present invention;

[0029] Figure 9 This is a side view of the battery cell module provided in an embodiment of this utility model;

[0030] Figure 10This is provided by the embodiment of the present utility model. Figure 9 Cross-sectional view along the AA direction;

[0031] Figure 11 This is provided by the embodiment of the present utility model. Figure 10 A magnified view of region A in the middle.

[0032] Explanation of icon numbers:

[0033] 10. Battery box;

[0034] 11. Enclosure; 111. Fixing cavity; 112. Opening; 113. Ventilation holes;

[0035] 12. Mounting bracket; 121. Crossbeam; 122. Longitudinal beam; 1221. Fixing hole; 123. Placement plate;

[0036] 13. Busbar assembly; 131. Busbar; 1311. First limiting hole; 132. Spring; 1321. Fixed end; 1322. Free end; 133. Spring; 134. Insulating post; 135. Limiting element;

[0037] 20. Battery pack;

[0038] 21. Housing; 211. Air vent;

[0039] 22. Output terminal; 221. Second limiting hole;

[0040] 23. Battery cell module; 231. End plate; 2311. Mounting slot; 232. Side plate; 2321. Rigid section; 2322. Flexible section; 233. Battery cell; 234. Heat sink; 2341. Heat dissipation channel; 235. Battery cell unit;

[0041] 24. Fan. Detailed Implementation

[0042] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0043] Please see Figures 1 to 3 , Figure 1 This is a schematic diagram of the structure of the battery box 10 provided in this embodiment of the utility model. Figure 2 This is a connection diagram of the bus assembly 13 provided in this embodiment of the present invention. Figure 3 This is a schematic diagram of the structure of the busbar assembly 13 provided in this embodiment of the present invention.

[0044] This utility model provides a battery box 10 designed to optimize the stability of the connection between the battery box 10 and the battery pack. The battery box 10 includes a box body 11, a mounting bracket 12, and a busbar assembly 13. First, a fixing cavity 111 is provided inside the box body 11 to facilitate the installation and removal of the battery pack. Furthermore, the mounting bracket 12 is provided within the fixing cavity 111 to specifically support the battery pack. Considering the weight and size of the battery pack, a multi-point support structure is adopted to increase stability. The busbar assembly 13 is connected to the box body 11 or the mounting bracket 12 via an insulating material to prevent current leakage and short circuits. The busbar assembly 13 is designed to contact the output terminal 22 of the battery pack using an elastic abutment method, allowing the busbar assembly 13 to automatically adjust its contact pressure when the battery pack is operating, ensuring continuous and reliable current transmission.

[0045] In this embodiment, the traditional bolt connection method is abandoned, avoiding the potential for unwinding after bolt locking. Instead, an elastic support method is adopted. Through the elastic force, the busbar assembly 13 can always maintain close contact with the output terminal 22, ensuring stable current flow. This not only reduces contact resistance and improves the battery pack's continuous overcurrent capability, but also effectively reduces performance degradation and safety hazards caused by temperature rise, thus laying the foundation for the long-term reliable operation of the battery box 10.

[0046] Furthermore, the specific configuration of the busbar assembly 13 may include a busbar 131, a spring 132, a spring, and an insulating post, with each part structurally cooperating with the other to ensure efficient connection and stable performance of the battery pack.

[0047] Busbar 131 is connected to mounting bracket 12 via insulating posts. The insulating posts are made of insulating material to prevent current leakage and short-circuit risks, ensuring the safe operation of the battery pack. Busbar 131 is responsible for effectively collecting the output current of the battery pack for use, ensuring power transmission efficiency.

[0048] The spring 132 is an important component of the busbar assembly 13, consisting of a fixed end and a free end. The fixed end is fixedly connected to the busbar 131 to ensure that the spring 132 remains stable during operation; while the free end is spaced apart from the busbar 131, forming a bent structure to increase the contact area between the busbar 131 and the battery pack output terminal 22.

[0049] A spring is installed between the free end and the busbar 131. The spring enhances the holding capacity of the spring contact 132 through its elastic compression characteristics. When the output terminal 22 of the battery pack contacts the spring contact 132, the elastic compression of the spring effectively provides continuous pressure, ensuring that the spring contact 132 maintains good contact with the output terminal 22 at all times. This not only ensures stable current transmission but also significantly reduces contact resistance and minimizes performance degradation caused by temperature increases.

[0050] In this embodiment, by employing a combination of spring and spring, the busbar assembly 13 can adapt to changes in the battery pack under different operating conditions. Whether due to temperature changes, vibration, or minute displacement of the battery pack, the busbar assembly 13 can quickly adjust its contact pressure to maintain a good connection between the battery pack and the busbar 131, significantly improving the battery pack's continuous overcurrent capability and the overall safety of the system, providing a strong guarantee for the application of high-energy-density batteries.

[0051] Furthermore, to improve the accuracy of the alignment between the busbar assembly 13 and the battery pack output terminal 22, a limiting member is introduced into the busbar assembly 13. A first limiting hole 1311 is provided on the busbar 131, and the limiting member passes through the first limiting hole 1311 and connects with the busbar 131 to form a stable fixed point to limit the position of the busbar assembly 13.

[0052] In this embodiment, the shape of the limiting member can be optimized to further enhance its durability and adaptability. The main function of the limiting member is to connect with the battery pack and the busbar assembly 13 to prevent a large gap between them, ensuring that the spring 132 can always effectively hold the battery pack output terminal 22. It can effectively prevent the contact position between the spring 132 and the output terminal 22 from shifting under external conditions such as vibration or temperature changes, thereby preventing poor contact or increased internal resistance.

[0053] Furthermore, the mounting frame 12 may specifically include multiple crossbeams 121 for battery packs, multiple longitudinal beams 122, and multiple placement plates 123, designed to provide stable support. The multiple crossbeams 121 for battery packs are spaced apart along the height direction of the housing 11 on the inner wall of the housing 11, forming a support frame. Through appropriate spacing, the crossbeams 121 for battery packs can effectively distribute the weight of the battery packs, reducing the risk of deformation due to concentrated loads.

[0054] The longitudinal beam 122 extends along the height of the housing 11 and is fixedly connected to the battery packs at intervals with the multiple crossbeams 121. The placement plate 123 is fixed to the longitudinal beam 122 and is specifically used to place the battery packs. The surface of the placement plate 123 is designed with anti-slip function to effectively prevent the battery packs from sliding or shifting during use and ensure the safety of the battery packs.

[0055] In this embodiment, the structure of the mounting bracket 12 can be flexibly adjusted according to the size and quantity of the battery pack. For example, the spacing between the crossbeam 121 (battery pack) and the longitudinal beam 122 can be customized according to the specifications of the battery pack to adapt to different application scenarios. At the same time, the number and position of the placement plates 123 can also be adjusted according to actual needs to meet the installation requirements of battery packs with different configurations.

[0056] Furthermore, to facilitate the adjustment of the placement plate 123 to accommodate battery packs of different specifications, the longitudinal beam 122 has multiple fixing holes 1221 for the battery packs along the height direction of the housing 11. The placement plate 123 is connected to at least one of the fixing holes 1221 for the battery packs via fasteners. This connection method provides stable support while allowing operators to quickly adjust the position when needed, enabling the mounting bracket 12 to be compatible with battery packs of various sizes and shapes to meet the needs of different application scenarios.

[0057] In this embodiment, the battery pack with mounting holes 1221 is evenly distributed to ensure that the placement plate 123 receives good support in different positions. The placement plate 123 can be quickly adjusted in position by connecting to different battery packs with mounting holes 1221. Furthermore, to improve user experience, the battery packs with mounting holes 1221 on the longitudinal beam 122 can be marked according to the thickness of different battery packs, allowing operators to more intuitively select the appropriate installation position.

[0058] In some embodiments, considering that the battery pack generates heat during operation, multiple heat dissipation holes 113 are provided on the side of the housing 11 away from the opening 112. The heat dissipation holes 113 are evenly distributed on the back of the housing 11, which can promote air circulation. Heat rises and escapes through these heat dissipation holes 113, forming convection, which can help effectively dissipate the heat generated by the battery pack, thereby keeping the battery pack within a safe operating temperature range and improving the performance and safety of the overall system.

[0059] In this embodiment, the presence of heat dissipation holes 113 ensures the thermal management performance of the battery pack during operation, significantly reducing the risk of overheating. The size and shape of the heat dissipation holes 113 can be adapted as needed to prevent external debris from entering the housing 11 while ensuring efficient airflow.

[0060] Please see Figure 4 , Figure 4 This is a schematic diagram of the energy storage device provided in an embodiment of the present invention.

[0061] This utility model provides an energy storage device, including multiple battery packs and a battery box 10 designed as described above. The multiple battery packs are arranged in an orderly manner inside the battery box 10, forming a compact and efficient energy storage system.

[0062] In this embodiment, the battery packs can be flexibly configured according to specific application requirements. For example, lithium-ion batteries, lithium cobalt oxide batteries, or other novel energy storage materials can be used to meet various energy demands. The battery box 10 provides good support and protection for these battery packs, ensuring that they are not affected by external impacts and vibrations during operation, thereby extending the service life of the battery packs. Simultaneously, the battery packs of the energy storage device can be electrically connected through the busbar assembly 13 to form a parallel circuit structure to meet different power and voltage requirements. This achieves more efficient power management and distribution, adapting to various application scenarios such as home energy storage, commercial energy storage, and renewable energy systems.

[0063] Further, please refer to Figures 5 to 7 , Figure 5 This is an overall schematic diagram of the battery pack provided in an embodiment of the present invention. Figure 6 This is a side view of the battery pack provided in an embodiment of the present invention. Figure 7 This is a schematic diagram of the internal structure of the battery pack provided in this embodiment of the utility model. The battery pack structure may include multiple cell modules 23, a housing, and an output terminal 22. The multiple cell modules 23 are disposed inside the housing, which provides mechanical protection and can effectively prevent damage to the cell modules 23 caused by external impacts, vibrations, and environmental factors. The housing and the mounting bracket 12 are fixedly connected by fasteners to reduce poor contact caused by movement or vibration. The multiple cell modules 23 are electrically connected to the output terminal 22 to form an efficient power transmission path. The output terminal 22 and the busbar assembly 13 adopt an elastic abutment method. Through the cooperation of the spring 132 and the spring, it is ensured that the output terminal 22 and the busbar assembly 13 always maintain good contact during operation. This design can effectively reduce contact resistance, ensure stable current transmission, and reduce the impact of temperature changes or vibrations.

[0064] In this embodiment, the modular design of the battery pack makes maintenance and upgrades more convenient. If a cell module 23 malfunctions, it can be quickly replaced without disassembling the entire battery pack. In terms of connectivity, multiple cell modules 23 are connected in parallel via the busbar assembly 13, eliminating the need for wiring harnesses, improving overall aesthetics, saving on wiring costs, and reducing raw material procurement costs. Furthermore, the output terminal 22 elastically abuts against the busbar 131, ensuring continuous current flow to the battery pack and guaranteeing stable current transmission.

[0065] Furthermore, a second limiting hole 221 is provided on the output terminal 22 to further enhance the connection stability between the bus assembly 13 and the output terminal 22. The limiting member in the bus assembly 13 further locks the bus 131 and the output terminal 22 by passing through the first limiting hole 1311 of the bus 131 and the second limiting hole 221 of the output terminal 22, which can effectively prevent the connection from loosening due to vibration or temperature changes and ensure the stability of the current during transmission.

[0066] In this embodiment, the second limiting hole 221 serves as a connection point on the output terminal 22, cooperating with the first limiting hole 1311 of the busbar 131. The connection strength is ensured by the insertion of the limiting member. The shape of the limiting hole can be circular, elliptical, or rectangular, depending on the design requirements of the busbar assembly 13 and the output terminal 22, to ensure good alignment during connection.

[0067] In some embodiments, considering the heat dissipation problem inside the battery pack, the battery pack also includes multiple fans 24, which are disposed between the cell modules 23. To optimize the heat dissipation effect of the fans 24, an air vent housing 211 is provided on the housing opposite to the fans 24. The air vent housing 211 can effectively guide airflow, so that the fans 24 can quickly draw heat out of the cell modules 23 when they are working, keeping the internal operating temperature of the battery pack within a safe range.

[0068] In this embodiment, heat dissipation requirements and the performance of the battery cell 233 are fully considered to ensure that the cooperation between the two achieves the best heat dissipation effect. The fan 24, the air vent housing 211, and the heat sink 234 form a highly efficient internal heat dissipation system. The fan 24 enhances the heat exchange efficiency of the heat sink 234 and improves the airflow of the air vent housing 211, effectively avoiding performance degradation caused by heat accumulation. In addition, an appropriate distance is maintained between the fan 24 and the battery cell 233 to ensure smooth airflow while avoiding excessive space that could affect the heat dissipation effect.

[0069] Further, please refer to Figure 8 and Figure 9 , Figure 8 This is a schematic diagram of the structure of the battery module 23 provided in this embodiment of the present invention. Figure 9This is a side view of the battery cell module 23 provided in this embodiment of the present invention. The battery cell module 23 includes an end plate 231, a side plate 232, multiple battery cells 233, and a heat sink 234. The multiple battery cells 233 and the heat sink 234 are arranged alternately to form a functionally integrated battery cell unit 235. The heat sink 234 uses a thermally conductive material, which can quickly conduct the heat generated by the battery cell module 23 during charging and discharging to improve the overall heat dissipation effect. The end plates 231 are located at both ends of the battery cell unit 235, and the side plates 232 are located on the sides of the battery cell unit 235 to connect the end plates 231 on both sides, ensuring the stability and rigidity of the entire structure, thereby effectively resisting the influence of external impacts and vibrations on the battery cell module 23.

[0070] In this embodiment, the alternating arrangement of multiple battery cells and heat sinks significantly improves heat conduction efficiency, thereby effectively controlling temperature, extending battery life, and enhancing overall performance. Secondly, the end plates and side plates form the basic framework of the battery cell module, effectively protecting the internal battery cells. The end plates are located at both ends of the battery cell unit, ensuring the entire structure remains stable under external impacts or vibrations, preventing cell displacement or damage. The side plates connect the end plates at both ends, enhancing the overall rigidity of the module, preventing module deformation, and ensuring the overall stability of the battery cell module.

[0071] Further, please refer to Figure 10 and Figure 11 , Figure 10 This is provided by the embodiment of the present utility model. Figure 9 Cross-sectional view along the AA direction. Figure 11 This is provided by the embodiment of the present utility model. Figure 10 Enlarged view of area A. The side plate 232 includes an interconnected rigid section 2321 and an elastic section 2322, designed to provide more flexible structural support for the cell module 23. The end plate 231 has a mounting groove 2311. The rigid section 2321 fits tightly against the side of the cell unit 235, forming a stable connection base. The elastic section 2322 passes through the mounting groove 2311 and is fixed by fasteners, ensuring a stable connection under different operating conditions.

[0072] The elastic segment 2322 is in a folded state, giving the side plate 232 greater adaptability. When the length of the cell unit 235 changes, the overall length of the side plate 232 can be easily adjusted by regulating the folding length of the elastic segment 2322, ensuring that it can always fit tightly against the cell unit 235.

[0073] In this embodiment, the side plate 232 is structurally tightly integrated with the cell module 23, effectively absorbing external impacts and reducing the impact of vibration on the cell 233. The combination of the rigid section 2321 and the elastic section 2322 of the side plate 232 provides the cell module 23 with flexible adaptability, which not only simplifies the installation process of the cell module 23, but also improves the flexibility between cells 233 of different sizes, meeting diverse application needs.

[0074] In some embodiments, the heat sink 234 includes a plurality of heat dissipation channels 2341 that connect both sides of the battery cell 235 to optimize heat dissipation. The fan 24 faces the plurality of heat dissipation channels 2341, allowing the airflow generated by the fan 24 to pass directly through the heat dissipation channels 2341, thereby achieving sufficient heat exchange and cooling of the battery cell 233.

[0075] In this embodiment, the operation of fan 24 works closely with the heat dissipation channel 2341 of heat sink 234. When fan 24 is working, it can quickly draw in air and deliver cool air to both sides of the cell unit 235 through the heat dissipation channel 2341, thereby accelerating the dissipation of heat. The heat dissipation efficiency of cell unit 235 is significantly improved, ensuring that the battery pack will not be affected by overheating under high load and long-term use.

[0076] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this utility model embodiment are only used to explain the relative positional relationship and movement of each component in a certain specific posture. If the specific posture changes, the directional indicator will also change accordingly.

[0077] It should also be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on the other component or may be connected to an intermediary component. When a component is referred to as being "connected to" another component, it can be directly connected to the other component or indirectly connected to the other component through an intermediary component.

[0078] Furthermore, the use of terms such as "first" and "second" in this utility model is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. When the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed by this utility model.

[0079] The above description is only a preferred embodiment of the present utility model and does not limit the patent scope of the present utility model. All equivalent structural transformations made under the inventive concept of the present utility model using the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present utility model.

Claims

1. A battery box, characterized in that, include: The housing has a fixed cavity and an opening communicating with the fixed cavity, the fixed cavity being used to store the battery pack; A mounting bracket is disposed within the fixed cavity, and the mounting bracket is used to house the battery pack. The busbar assembly is insulated from the housing or the mounting bracket and is used to resiliently support the output terminals of the battery pack.

2. The battery box according to claim 1, characterized in that, The busbar assembly includes a busbar, a spring, a spring, and an insulating post. The busbar is connected to the mounting bracket via the insulating post. The spring includes a fixed end and a free end that are connected to each other. The fixed end is fixedly connected to the busbar, and the free end is spaced apart from the busbar. The spring is elastically compressed between the free end and the busbar. The spring is used to elastically hold the output terminal of the battery pack.

3. A battery box according to claim 2, characterized in that, The busbar assembly also includes a limiting member. A first limiting hole is provided on the busbar. The limiting member passes through the first limiting hole and is connected to the busbar. The limiting member is used to connect to the output terminal of the battery pack to keep the spring contact against the output terminal of the battery pack.

4. A battery box according to any one of claims 1 to 3, characterized in that, The mounting frame includes multiple crossbeams, multiple longitudinal beams, and multiple placement plates. The multiple crossbeams are spaced apart on the housing along the height direction of the housing. The multiple longitudinal beams are fixedly connected to the crossbeams at intervals. The longitudinal beams extend along the height direction of the housing. The placement plates are fixed on the longitudinal beams to hold the battery pack.

5. A battery box according to claim 4, characterized in that, The longitudinal beam has multiple fixing holes along the height direction of the box body, and the placement plate is connected to at least one of the fixing holes by fasteners.

6. An energy storage device, characterized in that, It includes multiple battery packs and a battery case according to any one of claims 1-5, wherein the multiple battery packs are disposed in the battery case.

7. An energy storage device according to claim 6, characterized in that, The battery pack includes multiple cell modules, a housing, and an output terminal. The multiple cell modules are disposed in the housing, the housing is connected to the mounting bracket, and the multiple cell modules are electrically connected to the output terminal. The output terminal is elastically abutted against the busbar assembly.

8. An energy storage device according to claim 7, characterized in that, The output terminal is provided with a second limiting hole, and the bus assembly passes through the second limiting hole and is connected to the output terminal.

9. An energy storage device according to claim 7, characterized in that, The battery cell module includes an end plate, a side plate, multiple battery cells, and a heat sink. The multiple battery cells and the heat sink are arranged alternately in sequence to form a battery cell unit. The end plate is located at both ends of the battery cell unit, and the side plate is located on the side of the battery cell unit and connected to the end plate.

10. An energy storage device according to claim 9, characterized in that, The side plate includes a rigid section and an elastic section connected to each other. The end plate has a mounting groove. The rigid section fits into the battery cell unit. The elastic section passes through the mounting groove and is fixed by fasteners. The elastic section is in a folded state.

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