Battery pack

Abstract

Disclosed in the present application is a battery pack, comprising: at least two battery modules, wherein recessed assembly grooves are provided at one end on an X axis, electrodes of the battery modules extend into the assembly grooves, and a busbar is integrated between the electrodes; an end cover, which is assembled at one end of the battery modules on the X axis, wherein a quick-connect socket is provided on the end cover; and a battery management system, wherein a quick-connect wire is inserted between the battery management system and the quick-connect socket.

Description

A battery pack

[0001] The present application claims priority to the Chinese patent application No. 202520097862.4, filed on January 15, 2025, the whole content of which is incorporated herein by reference. TECHNICAL FIELD

[0002] The present application relates to the technical field of battery, in particular to a battery pack. BACKGROUND

[0003] With the rapid development of electric vehicles and energy storage system technology, the demand for high-performance and high-energy-density battery packs is increasing. In the traditional multi-layer cell group battery pack design, the wiring between the liquid cooling pipe and the battery cell is mostly arranged on the outside of the battery module. This design not only is susceptible to external environmental influences, reducing the safety and reliability of the system, but also increases the difficulty of system maintenance due to complex wiring. TECHNICAL PROBLEM

[0004] To improve this situation, some design schemes choose to add an electrical compartment on one side of the battery module, which is designed to accommodate wiring and battery management system (BMS) in a centralized manner. However, this approach, while optimizing the internal structure to some extent, results in an increase in the overall size of the battery pack due to the large size of the battery management system, which in turn requires more assembly space, making it difficult to efficiently layout in limited space. TECHNICAL SOLUTION

[0005] In a first aspect, the present application provides a battery pack, comprising: at least two battery modules stacked along the Z-axis direction, each of the battery modules being provided with a recessed assembly slot at one end of the X-axis, the assembly slots of each of the battery modules being interconnected, and the electrodes of each of the battery modules extending into the respective assembly slot, and a wire harness being integrated between each of the electrodes and being electrically connected; an end cover, the end cover being assembled at one end of the X-axis of all the battery modules to cover all the assembly slots, and the end cover being provided with a quick connector socket configured to connect the wire harness; and a battery management system, the battery management system being connected to the quick connector socket through the quick connector line. ADVANTAGEOUS EFFECTS

[0006] The application provides the beneficial effects that: by adopting the above scheme, the assembly groove provides space for the integration of the electrode. The electrode extends into the respective assembly groove and is electrically connected through the integrated wire row, greatly simplifying the connection complexity between the battery modules and reducing the occupation of external space; the end cover covers the assembly grooves of all the battery modules, effectively playing a protection role, and the quick connector socket integrated on the end cover provides a convenient external connection point for the wire row, which not only enhances the structural integrity of the battery pack, but also facilitates the quick connection of the battery management system, improves the maintainability and flexibility of the system. BRIEF DESCRIPTION OF DRAWINGS

[0007] Fig. 1 is a schematic diagram of the three-dimensional structure of the embodiment of the application;

[0008] Fig. 2 is a schematic diagram of the battery frame structure of the embodiment of the application;

[0009] Fig. 3 is a schematic diagram of the internal structure of the battery module of the embodiment of the application;

[0010] Fig. 4 is a schematic diagram of the side structure of the embodiment of the application;

[0011] Fig. 5 is a sectional view of A-A in Fig. 4;

[0012] Fig. 6 is an enlarged view of region B in Fig. 5;

[0013] Fig. 7 is an enlarged view of region C in Fig. 5.

[0014] Among them, the meaning of the reference signs is as follows: 1, battery module; 11, battery frame; 111, assembly groove; 112, battery cell cavity; 113, second sealing groove; 114, second sealing member; 115, second locking site; 116, second locking member; 117, abutting edge; 12, electrode; 13, wire row; 14, battery cell group; 141, battery cell; 142, gasket; 15, spacer plate; 151, reinforcing rib; 152, retaining rib; 2, liquid cooling plate group; 21, first end liquid cooling plate; 211, first sealing groove; 212, first sealing member; 213, first locking site; 214, first locking member; 22, middle liquid cooling plate; 23, second end liquid cooling plate; 24, liquid cooling flow channel; 3, end cover; 31, quick connector socket; 4, battery management system; 41, quick connection wire; 5, heat conduction member; 6, third oil guiding structure.

[0015] Embodiment of the application

[0016] The embodiments of this application are shown in Figures 1-7, disclosing a battery pack. The length direction of the battery pack is defined as the X-axis, the width direction as the Y-axis, and the height direction as the Z-axis. The battery pack includes at least two battery modules 1 stacked along the Z-axis, an end cap 3, and a battery management system 4. Each battery module 1 has a recessed mounting groove 111 at one end of the X-axis. The mounting grooves 111 of each battery module 1 are interconnected. The electrode 12 of each battery module 1 extends into its respective mounting groove 111. A busbar 13 configured for electrical connection is integrated between each electrode 12. The end cap 3 is mounted on one end of all the battery modules 1 along the X-axis to cover all the mounting grooves 111. The end cap 3 has a quick-connect socket 31 configured for connecting the busbar 13. A quick-connect wire 41 is inserted between the battery management system 4 and the quick-connect socket 31. The mounting groove 111 provides space for the integration of the electrode 12 and the liquid cooling pipe. Electrodes 12 extend into their respective mounting slots 111 and are electrically connected via integrated busbars 13, greatly simplifying the connection complexity between battery modules 1 and reducing the occupancy of external space. End caps 3 cover the mounting slots 111 of all battery modules 1, effectively providing protection. The quick-connect sockets 31 integrated on them provide convenient external connection points for busbars 13, which not only enhances the structural integrity of the battery pack but also facilitates quick connection to the battery management system 4, improving the maintainability and flexibility of the system.

[0017] In some embodiments, the battery pack further includes a liquid cooling plate assembly 2, which includes a first end liquid cooling plate 21, at least one intermediate liquid cooling plate 22, and a second end liquid cooling plate 23 arranged sequentially along the Z-axis. The first end liquid cooling plate 21, the intermediate liquid cooling plate 22, and the second end liquid cooling plate 23 are connected by a liquid cooling channel 24, which is located within the assembly groove 111. The built-in liquid cooling channel 24 not only improves the cooling efficiency but also ensures the compactness and safety of the liquid cooling system, avoiding the drawbacks of exposed liquid cooling pipes in traditional designs.

[0018] Preferably, in this embodiment 1, the battery module 1 is provided with three, and each battery pack includes a battery frame 11 and multiple cell groups 14. The three cell groups 14 are arranged along the Y-axis direction, and each cell group 14 is formed by stacking multiple cells 141 along the X-axis direction. The battery frame 11 is open at both ends in the Z-axis direction and is configured to be assembled with the liquid cooling plate assembly 2. Preferably, the battery frame 11 and the liquid cooling plate assembly 2 are sealed together. Optionally, when the battery frame 11 is located at the top of the Z-axis, the top surface of the battery frame 11 is assembled with the first end liquid cooling plate 21, and the bottom surface of the battery frame 11 is assembled with the intermediate liquid cooling plate 22; when the battery frame 11 is located at the bottom of the Z-axis, the top surface of the battery frame 11 is assembled with the intermediate liquid cooling plate 22, and the bottom surface of the battery frame 11 is assembled with the second end liquid cooling plate 23; when the battery frame 11 is located between the top and bottom ends, the top and bottom surfaces of the battery frame 11 are respectively assembled with an intermediate liquid cooling plate 22. It should be noted that the assembly between the battery frame 11 and the liquid cooling plate assembly 2 includes, but is not limited to, welding, snap-fitting, or screwing. In this embodiment 1, the assembly between the battery frame 11 and the liquid cooling plate assembly 2 is connected by friction stir welding.

[0019] In some embodiments, to improve the welding stability between the battery frame 11 and the intermediate liquid cooling plate 22, an abutment ridge 117 is provided on the inner side of the battery frame 11. The abutment ridge 117 is sealed and welded to the intermediate liquid cooling plate 22, which helps to fix and limit the intermediate liquid cooling plate 22, ensuring the stable assembly and heat exchange of the intermediate liquid cooling plate 22. Preferably, the battery frame 11 and the intermediate liquid cooling plate 22 are connected by friction stir welding.

[0020] In this embodiment 1, the assembly groove 111 is disposed on the battery frame 11, and the battery frame 11 is also provided with cell cavities 112 spaced apart from the assembly groove 111 along the X-axis direction. The cell assembly 14 is disposed within the cell cavity 112, thereby maximizing the utilization of the space within the battery frame 11. This not only improves the energy density of the battery pack but also reduces the overall size and weight of the battery pack. The liquid cooling plate assembly 2 can be easily inserted into the battery frame 11 to exchange heat with the cell 141, reducing the temperature of the battery pack and extending the service life of the cell 141.

[0021] In some embodiments, optionally, a spacer plate 15 is provided between the cell cavity 112 and the assembly groove 111. The spacer plate 15 is provided with interlaced reinforcing ribs 151, which can significantly improve the mechanical strength of the spacer plate 15 and prevent the spacer plate 15 from deforming or breaking, thereby maintaining the stability and integrity of the battery module 1 structure.

[0022] In some embodiments, optionally, a spacer plate 15 is provided between the cell cavity 112 and the assembly groove 111. The spacer plate 15 has protruding retaining ribs 152, which abut or assemble with the end cap 3. The design of the retaining ribs 152 enhances the connection strength between the spacer plate 15 and the end cap 3, enabling the battery module 1 to remain stable when subjected to external impacts or vibrations. This structural stability helps prevent relative movement or misalignment between the cells 141, thereby reducing the risk of internal short circuits in the battery module 1.

[0023] In some embodiments, a thermally conductive element 5 is provided between the battery cell assembly 14 and the liquid cooling plate assembly 2. The thermally conductive element 5 serves as a heat transfer medium between the battery cell 141 and the liquid cooling plate, significantly improving heat conduction efficiency and facilitating the rapid transfer of heat generated by the battery cell 141 to the liquid cooling plate, where it is then carried away by the coolant, thereby achieving effective battery cooling. This ensures a more uniform temperature distribution among the battery cells 141, avoiding localized overheating or underheating, reducing the risk of battery thermal runaway, and enhancing battery safety. Optionally, the thermally conductive element 5 can be one or more of thermally conductive structural adhesive, thermally conductive gel, and thermally conductive silicone pads, which can be selected according to different needs. Thermally conductive structural adhesive is suitable for applications requiring high-strength bonding and heat dissipation; thermally conductive gel, due to its softness and compressibility, is suitable for filling uneven interfaces; and thermally conductive silicone pads, due to their good elasticity and sealing properties, are suitable for applications requiring sealing and cushioning. Specifically, in this embodiment 1, a CCS (Cell Connection System) is provided above the cell assembly 14, and a pad 142 is provided on the CCS. The pad 142 is sealed and heat-conducted with the liquid cooling plate assembly 2 by thermally conductive gel or thermally conductive silicone pad. The bottom surface of the cell assembly 14 is sealed and heat-conducted with the liquid cooling plate assembly 2 by thermally conductive structural adhesive.

[0024] In some embodiments, in order to improve the sealing between the battery frame 11 and the first end liquid cooling plate 21 or the second end liquid cooling plate 23, a first sealing groove 211 is provided on the side of the battery frame 11 facing the first end liquid cooling plate 21 or the second end liquid cooling plate 23. A first sealing element 212 is provided in the first sealing groove 211. Preferably, the first sealing element 212 is a sealant. A first locking position 213 is provided on the outside of the first sealing groove 211. Preferably, the first locking position 213 is a screw hole. A first locking attachment 214 is provided between the first locking position 213 and the first end liquid cooling plate 21 or between the first locking position 213 and the second end liquid cooling plate 23. Preferably, the first locking attachment 214 is a screw. This design ensures a tight seal between the battery frame 11 and the liquid cooling plate, helping to prevent external dust, moisture, and other impurities from entering the battery pack and maintaining a clean and stable internal environment. The design of the first locking attachment 213 and the first locking accessory 214 simplifies the connection between the battery frame 11 and the liquid cooling plate. This helps to simplify the battery pack assembly process and improve production efficiency.

[0025] In some embodiments, to improve the sealing between the battery frame 11 and the end cap 3, a second sealing groove 113 is provided on the side of the battery frame 11 facing the end cap 3. A second sealing element 114 is provided in the second sealing groove 113. Preferably, the second sealing element 114 is a sealant. A second locking position 115 is provided on the outside of the second sealing groove 113. Preferably, the second locking position 115 is a screw hole. A second locking attachment 116 is provided between the second locking position 115 and the end cap 3. Preferably, the second locking attachment 116 is a screw. This arrangement enhances the connection strength between the battery frame 11 and the end cap 3. The second locking attachment ensures the assembly accuracy between the battery frame 11 and the end cap 3, avoiding performance degradation or safety hazards caused by assembly errors, and improving the overall performance of the battery pack.

[0026] In this embodiment 1, an explosion-proof valve can also be provided on the battery frame 11 and / or end cap 3 to achieve a pressure relief effect.

[0027] In summary, the battery pack provided in this application has the following technical advantages:

[0028] 1. By setting a recessed mounting groove 111 at one end of each battery module 1 and extending the electrode 12 into the mounting groove 111 to achieve electrical connection through the integrated busbar 13, this design greatly simplifies the connection complexity between battery modules 1 and avoids the complex external wiring in traditional designs, thereby reducing the space occupied by the battery pack.

[0029] 2. The liquid cooling plate assembly 2 is tightly integrated with the battery module 1, and the liquid cooling channel 24 is located within the assembly slot 111, making the entire battery pack structure more compact and facilitating efficient layout within a limited space. The liquid cooling channel 24 is built-in and covered by the end cap 3, avoiding potential safety hazards such as collisions and leaks that may arise from exposed liquid cooling pipes in traditional designs. At the same time, the compact structure also reduces interference and damage to the battery pack from external factors.

[0030] 3. The quick-connect socket 31 integrated on the end cover 3 provides a convenient external connection point for the cable tray 13, enabling the battery management system 4 to be quickly connected via the quick-connect cable 41, thus improving the maintainability and flexibility of the system. When it is necessary to repair or replace the battery management system 4, simply disconnect the quick-connect cable 41 without disassembling the entire battery pack. The separate design of the battery pack and the battery management system 4 not only significantly reduces the overall size of the battery pack and improves space utilization, but also allows the battery management system 4 to be installed in a more flexible location, optimizing the system layout and meeting the needs of different application scenarios.

[0031] 4. The end cap 3 covers all the assembly slots 111 of the battery modules 1, which not only provides protection but also enhances the structural integrity of the battery pack. This design allows the battery pack to better maintain its structural stability when subjected to external impacts or vibrations.

Claims

1. A battery pack, comprising: At least two battery modules (1) stacked along the Z-axis, each battery module (1) having a recessed mounting groove (111) at one end of the X-axis, the mounting grooves (111) of each battery module (1) being interconnected, the electrode (12) of each battery module (1) extending into its respective mounting groove (111), and a busbar (13) configured to be electrically connected being integrated between each electrode (12); End cap (3), the end cap (3) is assembled on one end of all the battery modules (1) on the X-axis to cover all the mounting slots (111), and the end cap (3) is provided with a quick-connect socket (31) configured as a connecting bar (13); A battery management system (4) is provided, and a quick-connect cable (41) is connected between the battery management system (4) and the quick-connect socket (31).

2. The battery pack according to claim 1, wherein, The battery module (1) includes: A battery frame (11) is open at both ends in the Z-axis direction and is configured to be assembled with a liquid cooling plate assembly (2). The assembly groove (111) is provided on the battery frame (11). The battery frame (11) is also provided with a cell cavity (112) spaced apart from the assembly groove (111) in the X-axis direction. Multiple battery cell groups (14) are arranged in the battery cell cavity (112) along the Y-axis direction, and each battery cell group (14) is formed by stacking multiple battery cells (141) along the X-axis direction.

3. A battery pack according to claim 2, wherein, A spacer plate (15) is provided between the cell cavity (112) and the assembly groove (111), and the spacer plate (15) is provided with intersecting reinforcing ribs (151).

4. A battery pack according to claim 2, wherein, A spacer plate (15) is provided between the cell cavity (112) and the assembly groove (111). A protruding retaining rib (152) is provided on the spacer plate (15). The retaining rib (152) abuts against or is assembled with the end cap (3).

5. A battery pack according to claim 2, wherein, It also includes a liquid cooling plate assembly (2), which includes a first end liquid cooling plate (21), at least one intermediate liquid cooling plate (22) and a second end liquid cooling plate (23) arranged sequentially along the Z-axis direction. The first end liquid cooling plate (21), the intermediate liquid cooling plate (22) and the second end liquid cooling plate (23) are connected by a liquid cooling channel (24), which is located in the assembly groove (111).

6. A battery pack according to claim 5, wherein, The battery frame (11) is sealed to the liquid cooling plate assembly (2), and a heat-conducting component (5) is provided between the battery cell assembly (14) and the liquid cooling plate assembly (2).

7. A battery pack according to claim 6, wherein, The thermally conductive component (5) is one or more of the following: thermally conductive structural adhesive, thermally conductive gel, and thermally conductive silicone pad.

8. A battery pack according to claim 5, wherein, The battery frame (11) is provided with a first sealing groove (211) on the side facing the first end liquid cooling plate (21) or the second end liquid cooling plate (23). A first sealing element (212) is provided in the first sealing groove (211). A first locking attachment (213) is provided on the outside of the first sealing groove (211). A first locking accessory (214) is provided between the first locking attachment (213) and the first end liquid cooling plate (21) or between the first locking attachment (213) and the second end liquid cooling plate (23).

9. A battery pack according to any one of claims 2 to 8, wherein, The battery frame (11) has a second sealing groove (113) on the side facing the end cap (3), a second sealing element (114) is provided in the second sealing groove (113), a second locking attachment (115) is provided on the outside of the second sealing groove (113), and a second locking attachment (116) is provided between the second locking attachment (115) and the end cap (3).

10. A battery pack according to claim 5, wherein, The battery frame (11) has an abutment ridge (117) on its inner side, and the abutment ridge (117) is sealed to the intermediate liquid cooling plate (22).

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