Battery pack capable of preventing heat from spreading

Abstract

The utility model discloses a battery pack capable of preventing heat spreading. The battery pack can simultaneously take into account thermal runaway treatment of battery cells and heat dissipation during normal work. The battery pack capable of preventing heat spreading comprises a battery box body and at least one battery module installed in the battery box body, the battery box body at least comprises a heat dissipation side plate, the heat dissipation side plate is provided with a heat dissipation structure, and each battery module comprises a plurality of battery cells, a plurality of aerogel heat insulation units and two aerogel heat insulation side plates, the plurality of battery cells are sequentially arranged side by side in the left-right direction, the outer side surface of each battery cell comprises a side surface and an end surface of which the front end and the rear end are provided with tabs, each aerogel heat insulation unit covers one part of the side surface of each battery cell, and the two aerogel heat insulation side plates are respectively mounted on the front side surface and the rear side surface of the battery module; the aerogel heat insulation side plate covers the end face of the battery cell, and the part, not covered by the aerogel heat insulation unit, of the side face of the battery cell is tightly attached to the heat dissipation side plate.

Description

Technical Field

[0001] This utility model relates to the field of new energy batteries, and in particular to a battery pack for preventing heat spread. Background Technology

[0002] In new energy power batteries and energy storage batteries, factors such as overcharging, over-discharging, short circuits, external heat sources, and mechanical damage can cause uncontrolled chemical reactions within the battery, leading to heat accumulation and temperature increases, ultimately resulting in thermal runaway. To prevent thermal runaway, aerogel thermal insulation pads are typically placed between the battery cells. However, current aerogel thermal insulation pad designs are not ideal; they cannot effectively insulate against thermal runaway and directly impact cell heat dissipation. Therefore, how to simultaneously address both thermal runaway prevention and heat dissipation is a crucial issue. Utility Model Content

[0003] The purpose of this invention is to provide a battery pack that can simultaneously address thermal runaway of the battery cell and prevent thermal propagation by dissipating heat during normal operation.

[0004] To achieve the above objectives, the present invention provides a battery pack for preventing heat spread, comprising a battery housing and at least one battery module installed within the battery housing. The battery housing includes at least one heat dissipation side plate with a heat dissipation structure. The battery module includes multiple battery cells, multiple aerogel insulation units, and two aerogel insulation side plates. The multiple battery cells are arranged side by side in a left-right direction. The outer surface of the battery cells includes a side surface and end faces with tabs at the front and rear ends. Each aerogel insulation unit covers a portion of the side surface of the battery cell. The two aerogel insulation side plates are respectively installed on the front and rear sides of the battery module, and the aerogel insulation side plates cover the end faces of the battery cells. The portion of the side surface of the battery cell not covered by the aerogel insulation unit is pressed against the heat dissipation side plate.

[0005] Preferably, adjacent aerogel insulation units are close to each other and tightly attached, and the two aerogel insulation side plates are respectively attached to the front and rear ends of the aerogel insulation unit.

[0006] Preferably, the cross-section of the aerogel insulation unit is U-shaped.

[0007] Preferably, the battery module also includes a mica sheet, which is mounted on the aerogel heat-insulating side panel and is tightly attached to the aerogel heat-insulating side panel.

[0008] Preferably, the battery module also includes a circuit board mounted on a mica sheet. Multiple busbars are also mounted on the circuit board. The tabs pass through the aerogel heat insulation side plate, the mica sheet and the circuit board in sequence. Two cells are connected in parallel through the busbars to form a cell group. The cell groups are connected in series through the busbars.

[0009] Preferably, the battery pack for preventing heat spread of this utility model includes two battery modules, which are arranged one above the other and connected in series. The battery housing includes heat dissipation side plates located on its top and bottom sides.

[0010] Preferably, the battery pack of this utility model for preventing heat spread also includes a BMS module. The BMS module is located on one side of the upper battery module. The lower battery module is electrically connected to the first connector, the upper battery module is electrically connected to the BMS module, and the BMS module is electrically connected to the second connector. The first connector and the second connector are each installed on the heat dissipation side plate on the top side of the battery box.

[0011] Preferably, the heat dissipation structure consists of multiple fins formed on the surface of the heat dissipation side plate.

[0012] Preferably, the battery module also includes a fixing frame that encloses all the battery cells of the battery module and is also fixed to the heat dissipation side plate.

[0013] Preferably, the battery housing also includes connecting side plates located on the left and right sides of the heat dissipation side plate and fixed side plates located on the front and rear sides of the heat dissipation side plate. The upper and lower ends of the connecting side plates are respectively connected to the two heat dissipation side plates, and the fixed side plates are respectively connected to the connecting side plates and the heat dissipation side plates.

[0014] Compared with existing technologies, the heat propagation-preventing battery pack provided by this invention uses aerogel insulation units to partially cover the sides of the battery cells and aerogel insulation side plates to cover the end faces of the battery cells. At this point, most of the outer wall of the battery cell is surrounded by the aerogel insulation units and aerogel insulation side plates. Both the aerogel insulation units and aerogel insulation side plates have fire-retardant and heat-insulating functions. Therefore, when a battery cell experiences thermal runaway, the heat generated during the runaway can be contained within the cell, effectively preventing the heat from dissipating outwards and avoiding the heat from spreading to other battery cells. Furthermore, the portion of the battery cell's side not covered by the aerogel insulation units is pressed tightly against the heat dissipation side plate, allowing the battery cell to contact the heat dissipation side plate. This allows the heat dissipated by the battery cell during operation to flow directly to the heat dissipation side plate for external dissipation, ensuring normal external heat dissipation. In summary, the heat propagation-preventing battery pack using the technical solution of this invention can simultaneously address both thermal runaway handling and heat dissipation during normal operation. Attached Figure Description

[0015] Figure 1 This is a perspective view of the heat propagation-resistant battery pack of this utility model.

[0016] Figure 2 This is a perspective view of the heat propagation-preventing battery pack of this utility model when viewed from another angle.

[0017] Figure 3This is a perspective view of the heat propagation-preventing battery pack of this utility model after the battery box has been disassembled.

[0018] Figure 4 This is a perspective view of the heat propagation-preventing battery pack of this utility model after concealing the connecting side plate, the fixing side plate, and a heat dissipation side plate.

[0019] Figure 5 This is a three-dimensional view of the heat propagation-preventing battery pack of this utility model, after the battery box is hidden, and the mica sheet and circuit board of the battery module located on top are disassembled.

[0020] Figure 6 This is a perspective view of the heat propagation-preventing battery pack of this utility model, which is hidden below the battery module, connecting side plate, fixing side plate and heat dissipation side plate, and after hiding the mica sheet and circuit board, and after being separated from the fixing frame and aerogel heat insulation side plate.

[0021] Figure 7 It is to further conceal Figure 6 The aerogel insulation side panel and the main view after fixing the frame.

[0022] Figure 8 It is to further conceal Figure 7 A 3D view of the back of the heat dissipation side panel.

[0023] Figure 9 This is a three-dimensional view of the battery cell of this utility model after it has been separated from the aerogel insulation unit. Detailed Implementation

[0024] To explain the technical content and structural features of this utility model in detail, the following description is provided in conjunction with the embodiments and accompanying drawings.

[0025] like Figures 1 to 9 As shown, this utility model provides a battery pack 100 for preventing heat spread, including a battery housing 10 and at least one battery module 20 installed in the battery housing 10.

[0026] The battery housing 10 includes at least one heat dissipation side plate 11, which is provided with a heat dissipation structure to improve the external heat dissipation effect and efficiency. The battery module 20 includes multiple battery cells 21, multiple aerogel insulation units 22, and two aerogel insulation side plates 23. The multiple battery cells 21 are arranged side by side in a left-right direction. The outer surface of the battery cell 21 includes a side surface 211 and an end face 212 with tabs 213 at both the front and rear ends. Each aerogel insulation unit 22 covers a portion of the side surface 211 of the battery cell 21. The two aerogel insulation side plates 23 are respectively installed on the front and rear sides of the battery module 20, and the aerogel insulation side plates 23 cover the end face 212 of the battery cell 21. The portion of the side surface 211 of the battery cell 21 that is not covered by the aerogel insulation unit 22 is attached to the heat dissipation side plate 11.

[0027] The battery pack 100 for preventing heat spread provided by this utility model uses an aerogel insulation unit 22 to partially cover the side 211 of the battery cell 21, and uses an aerogel insulation side plate 23 to cover the end face 212 of the battery cell 21. At this time, most of the outer wall of the battery cell 21 is surrounded by the aerogel insulation unit 22 and the aerogel insulation side plate 23. Both the aerogel insulation unit 22 and the aerogel insulation side plate 23 have the functions of fire prevention, flame retardancy and heat insulation. Therefore, when the battery cell 21 experiences thermal runaway, it can limit the heat of the battery cell 21 during thermal runaway, effectively prevent the heat of thermal runaway from dissipating to the outside, and avoid the heat of thermal runaway from spreading to other battery cells 21. Furthermore, the portion of the side 211 of the battery cell 21 not covered by the aerogel insulation unit 22 is tightly attached to the heat dissipation side plate 11, allowing the battery cell 21 to contact the heat dissipation side plate 11. This enables the heat dissipated by the battery cell 21 during operation to flow directly to the heat dissipation side plate 11 for external dissipation, ensuring that the battery cell 21 can dissipate heat normally. In summary, the battery pack 100 with heat propagation prevention using the technical solution of this utility model can simultaneously address thermal runaway handling of the battery cell 21 and heat dissipation during normal operation.

[0028] Figure 7 In the diagram, the path indicated by the hollow arrow A is the approximate path of heat flow from cell 21 to the heat dissipation side plate during normal operation.

[0029] like Figures 3 to 8 As shown, adjacent aerogel insulation units 22 are close to each other and tightly attached. The two aerogel insulation side plates 23 are respectively attached to the front and rear ends of the aerogel insulation unit 22. This design makes the overall structure of the battery module 20 more compact and also makes the aerogel insulation unit 22 tightly wrap around the cell 21 to avoid loosening and better perform the functions of heat insulation and fire prevention and flame retardancy.

[0030] like Figures 3 to 9 As shown, the cross-section of the aerogel insulation unit 22 is U-shaped, allowing it to more comprehensively cover a portion of the side surface of the battery cell 21. Preferably, in the embodiment provided by this invention, the battery cell 21 is generally square, more specifically, rectangular, with four sides 211 (including upper, lower, left, and right sides) and two end faces 212 (including front and rear end faces). The aerogel insulation unit 22 covers three of these sides, with the remaining side adhering to the heat dissipation side plate 11. In this case, the aerogel insulation unit 22 and the aerogel insulation side plate 23 provide a large-area, complete coverage of the side surfaces 211 and end faces 212 of the battery cell 21, ensuring heat insulation and fire-retardant effects. A portion of the uncovered side surface 211 is used to contact the heat dissipation side plate 11 to achieve normal external heat dissipation of the battery cell 21. However, depending on actual needs, the battery cell 21 can also be designed as a cylindrical battery cell.

[0031] like Figures 3 to 5As shown, the battery module 20 also includes a mica sheet 24, which is mounted on the aerogel heat insulation side panel 23 and is tightly attached to the aerogel heat insulation side panel 23. The mica sheet 24 helps to enhance the heat insulation and fire-retardant effect, and also prevents heat from being transferred to the circuit board 25, which will be described later, thus avoiding affecting the normal operation of the circuit board 25.

[0032] like Figures 3 to 5 As shown, the battery module 20 also includes a circuit board 25. The circuit board 25 is mounted on the mica sheet 24, and multiple busbars 26 are also mounted on the circuit board 25. The tabs 213 sequentially extend from the aerogel insulating side plate 23, the mica sheet 24, and the circuit board 25, as shown. Figure 4 As shown, two battery cells 21 are connected in parallel through busbar 26 to form battery cell group 01, and the battery cell groups 01 are connected in series through busbar 26.

[0033] like Figure 3 , Figure 4 and Figure 5 As shown, the heat propagation-preventing battery pack 100 of this utility model includes two battery modules 20, which are arranged one above the other and connected in series. In the embodiment provided by this utility model, the number of battery cells 21 contained in the two battery modules 20 is different. The upper battery module 20 contains 12 battery cells 21 (a total of 6 cell groups 01), while the lower battery module 20 contains 14 battery cells 21 (a total of 7 cell groups 01). However, it is not limited to this, and battery modules 20 containing the same number of battery cells 21 can also be used. The two battery modules 20 form a 2P13S structure. The upper battery module 20 contains fewer battery cells 21, so that a corner space 27 is formed between the upper battery module 20 and the lower battery module 20. This corner space 27 is set to facilitate the placement of the BMS module 30 mentioned later.

[0034] like Figure 2 and 3 As shown, the battery housing 10 includes heat dissipation side plates 11 located on its top and bottom sides. The battery cells 21 of the upper battery module 20 are in contact with the heat dissipation side plate 11 located on the top side for external heat dissipation, and the battery cells 21 of the lower battery module 20 are in contact with the heat dissipation side plate 11 located on the bottom side for external heat dissipation.

[0035] like Figures 1 to 8As shown, the heat propagation-preventing battery pack 100 of this utility model also includes a BMS module 30. The BMS module 30 is located on one side of the upper battery module 20. The lower battery module 20 is electrically connected to the first connector 40, and the upper battery module 20 is electrically connected to the BMS module 30. The BMS module 30 is electrically connected to the second connector 50. The first connector 40 and the second connector 50 are each mounted on the heat dissipation side plate 11 on the top side of the battery housing 10. The BMS module 30 is added to manage and monitor the status of the battery pack, ensuring the safe and efficient operation of the battery pack. One of the first connector 40 and the second connector 50 serves as the negative terminal of the battery pack 100, and the other serves as the positive terminal of the battery pack 100. The first connector 40 and the second connector 50 are mounted on the heat dissipation side plate 11 on the top of the battery housing 10 to facilitate the connection of external devices to the first connector 40 and the second connector 50. Preferably, the first connector 40 and the second connector 50 are located at the front and rear ends of the left side of the heat dissipation side plate 11, respectively.

[0036] like Figure 1 , Figure 2 , Figure 3 , Figure 6 and Figure 7 As shown, the heat dissipation side plates 11 located on the top and bottom sides are square. The heat dissipation structure consists of multiple fins formed on the surface of the heat dissipation side plates 11. The multiple fins can increase the external heat dissipation area, thereby ensuring the heat dissipation effect and efficiency. However, the heat dissipation structure can also adopt water cooling, air cooling, or other structural devices to further improve the external heat dissipation effect. Preferably, the heat dissipation side plates 11 are made of aluminum alloy plates, but are not limited to this.

[0037] like Figures 3 to 7 As shown, to enhance the structural stability of the battery module 20, the battery module 20 also includes a fixing frame 28, which encloses all the battery cells 21 of the battery module 20. The fixing frame 28 is also fixed to the heat dissipation side plate 11. After the heat dissipation side plate 11 and the fixing frame 28 are connected and fixed, they tightly enclose and fix the multiple battery cells 21 arranged side by side, which helps to improve the structural stability of the battery module 20. The circuit boards 25 located at the front and rear ends of the battery module 20 do not need to be surrounded by the fixing frame 28. In the embodiment provided by this utility model, the fixing frame 28 encloses three sides of the structure composed of multiple battery cells 21.

[0038] like Figures 1 to 3As shown in the embodiment provided by this utility model, the battery box 10 is square, but it is not limited to this. Depending on actual needs, the battery box 10 can also be configured as trapezoidal or the like. The battery box 10 also includes connecting side plates 12 located on the left and right sides of the heat dissipation side plate 11 and fixed side plates 13 located on the front and rear sides of the heat dissipation side plate 11. The upper and lower ends of the connecting side plates 12 are respectively connected to the two heat dissipation side plates 11, and the fixed side plates 13 are respectively connected to the connecting side plates 12 and the heat dissipation side plates 11.

[0039] Figure 1 and Figure 2 In the diagram, arrow X points from left to right, arrow Y points from front to back, and arrow Z points from top to bottom.

[0040] The above-disclosed examples are merely preferred embodiments of the present utility model and should not be construed as limiting the scope of the present utility model. Therefore, any equivalent variations made in accordance with the claims of the present utility model shall fall within the scope of the present utility model.

Claims

1. A battery pack with heat propagation prevention, characterized in that: The battery module includes a battery housing and at least one battery module installed within the battery housing. The battery housing includes at least one heat dissipation side plate with a heat dissipation structure. The battery module includes multiple battery cells, multiple aerogel insulation units, and two aerogel insulation side plates. The multiple battery cells are arranged side by side in a left-right direction. The outer surface of each battery cell includes a side surface and end faces with tabs at the front and rear ends. Each aerogel insulation unit covers a portion of the side surface of the battery cell. The two aerogel insulation side plates are respectively installed on the front and rear sides of the battery module, and the aerogel insulation side plates cover the end faces of the battery cells. The portion of the side surface of the battery cell not covered by the aerogel insulation unit is pressed against the heat dissipation side plate.

2. The battery pack for preventing heat propagation according to claim 1, characterized in that, The adjacent aerogel insulation units are close to each other and pressed together, and the two aerogel insulation side plates are pressed together with the front and rear ends of the aerogel insulation unit respectively.

3. The battery pack for preventing heat propagation according to claim 1, characterized in that, The cross-section of the aerogel insulation unit is U-shaped.

4. The battery pack for preventing heat propagation according to claim 1, characterized in that, The battery module also includes a mica sheet, which is mounted on the aerogel heat insulation side panel and is tightly attached to the aerogel heat insulation side panel.

5. The battery pack for preventing heat propagation according to claim 4, characterized in that, The battery module also includes a circuit board, which is mounted on the mica sheet. Multiple busbars are also mounted on the circuit board. The tabs pass through the aerogel heat insulation side plate, the mica sheet and the circuit board in sequence. Two cells are connected in parallel through the busbars to form a cell group. The cell groups are connected in series through the busbars.

6. The battery pack for preventing heat propagation according to claim 1, characterized in that, It includes two battery modules, which are arranged one above the other and connected in series. The battery housing includes heat dissipation side plates located on its top and bottom sides.

7. The battery pack for preventing heat propagation according to claim 6, characterized in that, It also includes a BMS module, which is located on one side of the upper battery module. The lower battery module is electrically connected to the first connector, and the upper battery module is electrically connected to the BMS module. The BMS module is electrically connected to the second connector. The first connector and the second connector are each installed on the heat dissipation side plate on the top side of the battery box.

8. The battery pack for preventing heat propagation according to claim 1, characterized in that, The heat dissipation structure consists of multiple fins formed on the surface of the heat dissipation side plate.

9. The battery pack for preventing heat propagation according to claim 1, characterized in that, The battery module also includes a fixing frame that encloses all the battery cells of the battery module and is also fixed to the heat dissipation side plate.

10. The battery pack for preventing heat propagation according to claim 1, characterized in that, The battery box also includes connecting side plates located on the left and right sides of the heat dissipation side plate and fixed side plates located on the front and rear sides of the heat dissipation side plate. The upper and lower ends of the connecting side plates are respectively connected to the two heat dissipation side plates, and the fixed side plates are respectively connected to the connecting side plates and the heat dissipation side plates.

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