A module for pouch cells

Abstract

This utility model relates to the field of battery pack technology and discloses a module for soft-pack battery cells, including multiple battery cells. Heat insulation pads are fixedly connected to both sides of each battery cell. One end plate is fixedly connected to one side of one of the heat insulation pads. A positive output terminal is fixedly connected to the top of the end plate. Two screws are threaded to one side of the end plate. A tab bracket is threaded to the outer wall of the two screws. A busbar is fixedly connected to the inner wall of the tab bracket. A plastic end cap is threaded to the outer wall of the two screws. A fireproof plate is movably connected to the inner wall of the plastic end cap. An FPC is fixedly connected to the outer wall of the busbar. In this utility model, the battery cells are separated by foam and heat insulation pads, which on the one hand meets the requirements of battery cell cycle performance, and on the other hand provides heat insulation in the event of thermal runaway, preventing heat diffusion.

Description

Technical Field

[0001] This utility model relates to the field of battery pack technology, and in particular to a module for soft-pack battery cells. Background Technology

[0002] Soft-pack battery modules refer to battery modules formed by combining soft-pack battery cells through a certain design and structure. Compared with traditional hard-shell batteries (such as cylindrical and square batteries), soft-pack batteries are lighter and more flexible. Their modular applications are widespread, especially in electric vehicles, energy storage devices and consumer electronics.

[0003] Traditional pouch battery modules consist of individual battery cells, a battery management system (BMS), a thermal management system, and protection components. Their working principle includes the energy conversion of the battery during charging and discharging, the BMS monitoring the battery status to ensure safety, the thermal management system regulating the temperature to prevent overheating, and the overall structure and devices working together to ensure the efficient and safe operation of the battery.

[0004] Traditional pouch cell modules have a large number of structural components, which increases the cost of the module components by nearly half and also increases the complexity of the assembly process, requiring the shell to be welded. In addition, it also reduces the energy density of the module. To address these issues, a new pouch cell module is proposed. Utility Model Content

[0005] To overcome the above shortcomings, this utility model provides a module for pouch cells, aiming to improve the problem of complex structure of existing pouch cell modules.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A module for soft-pack battery cells includes multiple battery cells. Heat insulation pads are fixedly connected to both sides of each battery cell. One heat insulation pad has an end plate fixedly connected to one side. A positive output terminal is fixedly connected to the top of the end plate. Two screws are threaded to one side of the end plate. A tab bracket is threaded to the outer wall of the two screws. A busbar is fixedly connected to the inner wall of the tab bracket. A plastic end cap is threaded to the outer wall of the two screws. A fireproof plate is movably connected to the inner wall of the plastic end cap. An FPC is fixedly connected to the outer wall of the busbar. Another heat insulation pad has an end plate fixedly connected to one side. A negative output terminal is fixedly connected to the top of the second end plate. Two top sealing foams are fixedly connected to the top of each of the multiple battery cells. Two bottom sealing foams are fixedly connected to the bottom of each of the multiple battery cells. A detachable component is provided on one side of the first end plate.

[0008] As a further description of the above technical solution:

[0009] The detachable component includes a connecting rod, one end of which is fixedly connected to a clip, a protective plate is slidably connected to the outer wall of the connecting rod, a sliding shell is slidably connected to the outer wall of the connecting rod, a spring is sleeved on the outer wall of the connecting rod, a fixing plate is fixedly connected to the outer wall of the connecting rod, and a knob is fixedly connected to one end of the connecting rod.

[0010] As a further description of the above technical solution:

[0011] The other end of the negative output pole is fixedly connected to one side of the end plate, and the top of the FPC is fixedly connected to the bottom of the two top sealing foams.

[0012] As a further description of the above technical solution:

[0013] One side of the electrode bracket is in contact with one side of the fireproof plate, and one side of the electrode bracket is in contact with one end of the plurality of battery cells;

[0014] As a further description of the above technical solution:

[0015] One end of the positive output electrode is slidably connected to the inner wall of the plastic end cap, and one end of the FPC is in contact with one side of the fireproof board.

[0016] As a further description of the above technical solution:

[0017] The outer wall of the card head is slidably connected to the inner wall of the end plate, and the outer wall of the fixing piece is slidably connected to the inner wall of the sliding shell.

[0018] As a further description of the above technical solution:

[0019] One end of the spring is fixedly connected to the inner wall of the sliding shell, and the other end of the spring is fixedly connected to one side of the fixing plate.

[0020] As a further description of the above technical solution:

[0021] The card head is slidably connected to the inner wall of the protective plate, and the outer wall of the sliding shell is in contact with the outer wall of the protective plate.

[0022] This utility model has the following beneficial effects:

[0023] 1. In this utility model, foam and heat insulation pads are used to separate the battery cells. On the one hand, this meets the requirements of the battery cell cycle performance, and on the other hand, it can play a role in heat insulation when thermal runaway is triggered, thus preventing heat diffusion. The two ends of the battery cell stacking module are bonded to the metal insulating end plate one and end plate two by spraying adhesive, which plays a role in mechanical and electrical performance protection. The tab bracket is fixed to the end plate one and end plate two on both sides of the module by screws, which can eliminate the need for the tab bracket positioning tooling. The busbar and the tab bracket are assembled by interference fit.

[0024] 2. In this utility model, by rotating the knob, the connecting rod can be rotated during the rotation of the knob, and the rotation of the connecting rod can be rotated to rotate the clamp head. When the clamp head is rotated to be flush with the inner wall groove of the end plate and the protective plate, the connecting rod and the clamp head can be removed from the inner wall of the end plate and the protective plate. At this time, the locking of the clamp head to the end plate and the protective plate can be released, and the protective plate can be removed. Attached Figure Description

[0025] Figure 1 This is a three-dimensional schematic diagram of a module for a soft-pack battery cell proposed in this utility model;

[0026] Figure 2 This is a schematic diagram of the top sealing foam of a soft-pack battery cell module proposed in this utility model;

[0027] Figure 3 This is a schematic diagram of the structure of a fireproof board for a soft-pack battery cell module proposed in this utility model;

[0028] Figure 4 for Figure 2 Enlarged view of point A in the middle.

[0029] Legend:

[0030] 1. Battery cell; 2. Heat insulation pad; 3. End plate one; 4. Output positive pole; 5. Busbar; 6. Terminal bracket; 7. Fireproof board; 8. Plastic end cap; 9. FPC; 10. Top sealing foam; 11. Output negative pole; 12. Bottom sealing foam; 13. End plate two; 14. Protective plate; 15. Connecting rod; 16. Clip; 17. Sliding shell; 18. Fixing plate; 19. Spring; 20. Knob; 21. Screw. Detailed Implementation

[0031] 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.

[0032] Reference Figures 1 to 3 This utility model provides an embodiment of a soft-pack battery cell module, comprising multiple battery cells 1. The battery cell 1 serves as the core component for energy storage and release, achieving energy storage and output through internal chemical reactions. Heat insulation pads 2 are fixedly connected to both sides of the multiple battery cells 1. The heat insulation pads 2 are fixed to both sides of the battery cells 1, which can prevent the heat generated by the battery cells 1 during operation from being transferred to the outside, and at the same time prevent the high temperature of the external environment from affecting the working state of the battery cells 1. An end plate 3 is fixedly connected to one side of one of the heat insulation pads 2. The end plate 3 is used to provide lateral support and fixation for the battery cells 1 and the heat insulation pads 2, enhancing the stability of the overall structure of the module. An output positive electrode 4 is fixedly connected to the top of the end plate 3. The output positive electrode 4 is fixed to the top of the end plate 3 and serves as the positive interface for the module's energy output, used to transmit the energy generated by the battery cells 1 to the outside through the positive electrode.

[0033] Two screws 21 are threadedly connected to one side of end plate 3. The two screws 21 are threadedly connected to end plate 3. The tightening force generated by the thread engagement connects and fixes the subsequent components to end plate 3. The outer wall of the two screws 21 is threadedly connected to the tab bracket 6. The tab bracket 6 is threadedly connected to the outer wall of the screws 21. It is fixed with the tightening force of the screws 21 and is used to support and position the tabs of the battery cell 1 to ensure stable contact between the tabs and the subsequent components. The inner wall of the tab bracket 6 is fixedly connected to the busbar 5. The busbar 5 is fixed to the inner wall of the tab bracket 6 and is positioned by the tab bracket 6. It is used to collect the current of multiple battery cells 1 to achieve centralized current transmission. The outer wall of the two screws 21 is threadedly connected to the plastic end cap 8. The plastic end cap 8 is threadedly connected to the outer wall of the screws 21 and is fixed with the tightening force of the screws 21. It serves to insulate and protect the internal components and prevent external foreign objects from contacting the internal conductive structure.

[0034] A fireproof plate 7 is movably connected to the inner wall of the plastic end cap 8. The fireproof plate 7 is movably connected to the inner wall of the plastic end cap 8 and can block the spread of flames under the protection of the plastic end cap 8, thus playing a fireproof isolation role. An FPC9 is fixedly connected to the outer wall of the busbar 5. The FPC9 is fixed to the outer wall of the busbar 5 and is used to transmit the working status signal of the battery cell 1, such as voltage and temperature, so as to monitor the working status of the battery cell 1. An end plate 2 is fixedly connected to one side of another heat insulation pad 2. The end plate 2 is fixed to one side of another heat insulation pad 2 and cooperates with the end plate 3 to support and fix the battery cell 1 and the heat insulation pad 2 from the other side, further enhancing the stability of the module structure.

[0035] The top of end plate 2 13 is fixedly connected to the negative output pole 11. The negative output pole 11 is fixed to the top of end plate 2 13 and serves as the negative interface for the module's power output. It is used to transmit the power of the battery cell 1 to the outside through the negative pole and form a complete current loop with the positive output pole 4. The top of multiple battery cells 1 is fixedly connected to two top sealing foams 10. The two top sealing foams 10 fill the gap at the top of the battery cell 1 with their own elasticity, which plays a role in buffering and shock absorption, and at the same time helps to seal the top space of the battery cell 1. The bottom of multiple battery cells 1 is fixedly connected to two bottom sealing foams 12. The two bottom sealing foams 12 are fixed to the bottom of the battery cell 1. They fill the gap at the bottom of the battery cell 1 with their elasticity, buffering the vibration of the battery cell 1 during operation, and at the same time sealing the bottom space of the battery cell 1 to prevent dust and other foreign objects from entering. A detachable component is provided on one side of end plate 1 3.

[0036] Reference Figure 1 , Figure 3 and Figure 4 The detachable component includes a connecting rod 15, which serves as the main connecting part of the detachable component and provides installation support for subsequent components, enabling the linkage and assembly of various components. One end of the connecting rod 15 is fixedly connected to a clip 16, which is fixed to one end of the connecting rod 15. Through its specific shape and matching with the corresponding component's slot, the detachable component is snapped and fixed to the external structure. The outer wall of the connecting rod 15 is slidably connected to a protective plate 14, which can slide along the inner wall of the protective plate 14 to shield and protect the battery cell 1 and prevent damage from external collisions or foreign objects. The outer wall of the connecting rod 15 is slidably connected to a sliding shell 17, which can slide along the axial direction of the connecting rod 15. By adjusting the position through sliding, the component can be locked and unlocked in conjunction with subsequent components.

[0037] A spring 19 is sleeved on the outer wall of the connecting rod 15. The spring 19 is sleeved on the outer wall of the connecting rod 15 and generates elastic force by its own elastic deformation. It provides a restoring force when the component is operated, so that the relevant parts return to their initial positions. A fixing plate 18 is fixedly connected to the outer wall of the connecting rod 15. The fixing plate 18 is fixed to the outer wall of the connecting rod 15 and is used to limit the sliding range of the spring 19 and other components, ensuring that the spring 19 deforms within a preset range and ensuring the stability of the elastic force. A knob 20 is fixedly connected to one end of the connecting rod 15. The knob 20 is fixed to one end of the connecting rod 15, so that the operator can rotate or pull the knob 20 to drive the connecting rod 15 to move, thereby realizing the disassembly and installation of the protective plate 14.

[0038] Working principle: The battery cells 1 are separated by foam and heat insulation pads 2 of the same size as the cell body. This serves two purposes: firstly, it meets the cycle performance requirements of the cell 1; secondly, it provides insulation in the event of thermal runaway, preventing heat diffusion. The two ends of the cell 1 stacked module are bonded to the metal insulating end plates 1-3 and 2-13 using adhesive spray, providing mechanical and electrical protection. The tab brackets 6 are fixed to the end plates 1-3 and 2-13 on both sides of the module using screws 21, eliminating the need for tab bracket 6 positioning. In this assembly, the busbar 5 and the tab bracket 6 do not need to be fixed by the traditional hot riveting method, but are assembled by interference fit. The tab of the battery cell 1 passes through the tab bracket 6 and is bent and then welded to the corresponding busbar 5. At the same time, the nickel sheet on the FPC9 is also welded to the corresponding busbar 5 for voltage and current information acquisition. One part of the integrated output electrode is embedded in the tab bracket 6 and welded to the positive output electrode 4 and the negative output electrode 11 tabs. The other end is embedded in end plate 3 and end plate 13, finally forming the total positive and negative output electrodes of the entire module.

[0039] Fireproof board 7 is attached to the surface of busbar 5 with double-sided tape to prevent the flame of the module cell 1 from burning through the tab bracket 6 after runaway, which would cause the module to collapse and spread heat. The plastic end caps 8 at both ends of the module and the tab bracket 6 share screws 21 and are locked to the end plates 3 and 13 on both sides of the module. Two top sealing foams 10 and bottom sealing foams 12 are attached to the top and bottom of the module, respectively. When packing, these foams can prevent glue from overflowing and ensure a certain glue thickness to ensure the structural strength and thermal conductivity requirements of the module.

[0040] By rotating the knob 20, the connecting rod 15 rotates, which in turn rotates the locking head 16. When the locking head 16 rotates to be flush with the inner wall groove of the end plate 3 and the protective plate 14, the connecting rod 15 and the locking head 16 can be removed from the inner wall of the end plate 3 and the protective plate 14. At this time, the locking head 16 can be released from the end plate 3 and the protective plate 14, and the protective plate 14 can be removed. When installing the protective plate 14, the locking head 16 can be removed. Insert the protective plate 14 into the inner wall of the end plate 3. When the clamp 16 is inserted into the inner wall of the end plate 3, turn the knob 20. The knob 20 can drive the connecting rod 15 and the clamp 16 to rotate, which can engage the clamp 16 with the inside of the end plate 3. During the process of the connecting rod 15 moving inward, it can drive the fixing plate 18 to compress the spring 19 inward, so that the elastic force generated by the spring 19 can squeeze the sliding shell 17, thereby strengthening the connection between the end plate 3 and the protective plate 14, while preventing the clamp 16 from shifting.

[0041] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. 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 module for soft-pack battery cells, comprising a plurality of battery cells (1), characterized in that: Multiple battery cells (1) are fixedly connected to heat insulation pads (2) on both sides. One of the heat insulation pads (2) is fixedly connected to an end plate (3) on one side. The top of the end plate (3) is fixedly connected to the positive output terminal (4). Two screws (21) are threadedly connected to one side of the end plate (3). The outer walls of the two screws (21) are threadedly connected to a tab bracket (6). The inner wall of the tab bracket (6) is fixedly connected to a busbar (5). The outer walls of the two screws (21) are threadedly connected to a plastic end cap (8). Fireproof plate (7) is movably connected to the inner wall of the plastic end cap (8), FPC (9) is fixedly connected to the outer wall of the busbar (5), end plate two (13) is fixedly connected to one side of the other heat insulation pad (2), output negative (11) is fixedly connected to the top of the end plate two (13), two top sealing foams (10) are fixedly connected to the top of the multiple battery cells (1), two bottom sealing foams (12) are fixedly connected to the bottom of the multiple battery cells (1), and a detachable component is provided on one side of the end plate one (3).

2. The module for soft-pack battery cells of claim 1, wherein: The detachable component includes a connecting rod (15), one end of which is fixedly connected to a clip (16), a protective plate (14) is slidably connected to the outer wall of the connecting rod (15), a sliding shell (17) is slidably connected to the outer wall of the connecting rod (15), a spring (19) is sleeved on the outer wall of the connecting rod (15), a fixing piece (18) is fixedly connected to the outer wall of the connecting rod (15), and a knob (20) is fixedly connected to one end of the connecting rod (15).

3. The module for soft-pack battery cells of claim 2, wherein: The other end of the negative output pole (11) is fixedly connected to one side of the end plate (3), and the top of the FPC (9) is fixedly connected to the bottom of the two top sealing foams (10).

4. The module for soft-pack battery cells of claim 3, wherein: One side of the electrode bracket (6) is in contact with one side of the fireproof plate (7), and one side of the electrode bracket (6) is in contact with one end of one of the multiple battery cells (1).

5. The module for soft-pack battery cells of claim 1, wherein: One end of the positive output electrode (4) is slidably connected to the inner wall of the plastic end cap (8), and one end of the FPC (9) is in contact with one side of the fireproof plate (7).

6. The module for soft-pack battery cells of claim 2, wherein: The outer wall of the card head (16) is slidably connected to the inner wall of the end plate (3), and the outer wall of the fixing piece (18) is slidably connected to the inner wall of the sliding shell (17).

7. A module for soft-pack battery cells according to claim 2, characterized in that: One end of the spring (19) is fixedly connected to the inner wall of the sliding shell (17), and the other end of the spring (19) is fixedly connected to one side of the fixing plate (18).

8. The module for soft-pack battery cells of claim 2, wherein: The card head (16) is slidably connected to the inner wall of the protective plate (14), and the outer wall of the sliding shell (17) is in contact with the outer wall of the protective plate (14).

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