CTP battery pack with thermal runaway protection function

Abstract

The utility model relates to a CTP battery pack with a thermal runaway protection function. The CTP battery pack comprises a box body and a plurality of battery modules arranged in the box body, the battery pack further comprises a plurality of heat insulation pieces arranged in the battery box, the plurality of heat insulation pieces cover the plurality of battery modules respectively, each heat insulation piece is provided with an exhaust channel, and the tops of battery cells of the battery modules are provided with first anti-explosion valves capable of releasing leaks to the corresponding exhaust channels. Anti-explosion valves II are mounted on two side walls of the battery box in the length direction of the exhaust channel. According to the utility model, the explosion-proof valve I of the battery cell is arranged at the top end of the battery cell, and the heat insulation piece is arranged above the battery module, so that the thermal runaway leakage can be quickly discharged out of the battery box, the risk of heat spreading is reduced, and the damage of the thermal runaway leakage to the battery module, the battery box and other components of the battery pack can be prevented through the heat insulation piece.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, and in particular to a CTP battery pack with a thermal runaway protection function. Background Art

[0002] New energy vehicle power batteries typically consist of multiple battery modules, each of which contains multiple cells connected in series or parallel. Thermal runaway in power batteries typically stems from the thermal runaway behavior of a single cell. Existing battery module structures are designed to prevent the spread of thermal runaway, but are unable to control the thermal runaway behavior of a specific cell. This causes heat to rapidly spread from the runaway cell to adjacent cells, triggering a chain reaction that could potentially affect the entire new energy vehicle. Given current requirements for the energy density of lithium battery modules, improving the safety of power battery modules while minimizing their size is a key research topic in the lithium battery field.

[0003] At present, the technology for preventing thermal diffusion in battery packs mainly blocks the interaction between battery cells during thermal diffusion, and has no directional conduction effect. However, the CTP battery pack system has a high degree of integration and a higher cell density, requiring a more precise and effective thermal runaway diffusion protection design. Utility Model Content

[0004] Based on this, it is necessary to provide a CTP battery pack with thermal runaway protection function to address the technical problems of the current CTP battery pack system with high integration, greater cell density, and the need for more precise and effective thermal runaway diffusion protection design.

[0005] The utility model proposes a CTP battery pack with thermal runaway protection function, which includes a battery box and a plurality of battery modules arranged inside the battery box; it also includes a plurality of thermal insulation members arranged inside the battery box, and the plurality of thermal insulation members respectively cover the top of the plurality of battery modules, each thermal insulation member is provided with an exhaust channel, and the top of the battery cell of the battery module is provided with an explosion-proof valve 1 that can release leaked materials to the corresponding exhaust channel; the battery box is installed with explosion-proof valve 2 on both side walls in the longitudinal direction of the exhaust channel.

[0006] The utility model arranges the explosion-proof valve 1 of the battery cell at the top of the battery cell and arranges a heat insulation member above the battery module. When thermal runaway occurs in the battery cell, the leakage from the explosion-proof valve 1 quickly flows to the explosion-proof valve 2 at both ends of the battery box through the exhaust channel of the heat insulation member. The leakage is quickly discharged out of the battery box through the explosion-proof valve 2, reducing the risk of heat spread and ensuring the safety of the battery system and occupants. The heat insulation member can prevent the thermal runaway leakage from damaging the battery module, battery box and other components of the battery pack.

[0007] As a further improvement of the above-mentioned scheme of the present invention, the heat insulation component includes a heat insulation board 1 and a heat insulation board 2. The heat insulation board 1 covers the top of the corresponding battery module. A plurality of avoidance holes are opened through the heat insulation board 1. The explosion-proof valves 1 of the plurality of battery cells of the battery module pass through the plurality of avoidance holes respectively. The heat insulation board 2 is connected to the top of the battery box and two fixed foam blocks are connected to the side of the heat insulation board 2 facing the heat insulation board 1. A spacing is left between the two fixed foam blocks to form the exhaust channel, and the plurality of avoidance holes of the heat insulation board 1 are all located between the two fixed foam blocks.

[0008] As a further improvement of the above-mentioned solution of the present invention, the thermal insulation component also includes two pressing plates, both of which are arranged above the thermal insulation plate 1 and the multiple avoidance holes of the thermal insulation plate 1 are located between the two pressing plates, both ends of the pressing plates are connected to the battery box to compress the corresponding battery module and the thermal insulation plate 1, and a fixing groove is formed on the top of the pressing plate, and two fixed foam blocks are respectively arranged in the fixing grooves of the two pressing plates.

[0009] As a further improvement of the above solution of the present invention, the pressing plate is made of a metal plate.

[0010] As a further improvement of the above solution of the present invention, the first heat insulation board adopts mica board or ceramic board, and the first heat insulation board is bonded to the top of the battery module by structural adhesive.

[0011] As a further improvement of the above solution of the present invention, the second heat insulation board is made of mica board or ceramic board, and the second heat insulation board is bonded to the top of the fixed foam block and the top of the battery box by structural adhesive.

[0012] As a further improvement of the above-mentioned solution of the present invention, the battery box includes a lower box body and an upper cover plate; the top of the lower box body is open and several battery modules are arranged in the lower box body, the upper cover plate is cooperated and connected with the top of the lower box body to seal the lower box body, and the insulation plate 2 of each insulation part is connected to the upper cover plate.

[0013] As a further improvement of the above solution of the utility model, the lower box body is provided with vertically cross-connected cross beams and longitudinal beams, which divide the interior of the lower box body into four installation slots, and each installation slot is provided with a battery module.

[0014] As a further improvement of the above solution of the present invention, a thermal runaway sensor is installed on the inner wall of the battery box.

[0015] As a further improvement of the above solution of the present invention, explosion-proof valves three are installed on both side walls of the battery box in the width direction of the exhaust channel.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] The utility model arranges the explosion-proof valve 1 of the battery cell at the top of the battery cell and arranges a heat insulation member above the battery module. When thermal runaway occurs in the battery cell, the leakage from the explosion-proof valve 1 quickly flows to the explosion-proof valve 2 at both ends of the battery box through the exhaust channel of the heat insulation member. The leakage is quickly discharged out of the battery box through the explosion-proof valve 2, reducing the risk of heat spread and ensuring the safety of the battery system and occupants. The heat insulation member can prevent the thermal runaway leakage from damaging the battery module, battery box and other components of the battery pack. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic structural diagram of a CTP battery pack with thermal runaway protection function proposed in an embodiment of the present utility model;

[0019] Figure 2 This is a schematic structural diagram of the lower box of a CTP battery pack with thermal runaway protection function proposed in an embodiment of the present invention.

[0020] Figure numerals: 1. battery module; 2. explosion-proof valve 1; 3. explosion-proof valve 2; 4. heat insulation board 1; 5. heat insulation board 2; 6. fixed foam block; 7. pressure plate; 8. lower box body; 9. upper cover plate; 10. cross beam; 11. longitudinal beam; 12. installation groove; 13. explosion-proof valve 3. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0022] It should be noted that when a component is referred to as being "mounted on" another component, it may be directly on the other component or there may be a central component. When a component is considered to be "set on" another component, it may be directly set on the other component or there may be a central component. When a component is considered to be "fixed to" another component, it may be directly fixed to the other component or there may be a central component.

[0023] Unless otherwise defined, all technical and scientific terms used herein have the same meanings as those commonly understood by those skilled in the art to which this invention pertains. The terms used herein in the specification of this invention are for the purpose of describing specific embodiments only and are not intended to limit this invention. The term "or / and" as used herein includes any and all combinations of one or more of the associated listed items.

[0024] Reference Figure 1 This embodiment proposes a CTP battery pack with thermal runaway protection function, including a battery box, eight battery modules 1 and eight thermal insulation components.

[0025] The battery box includes an upper cover plate 9 and a lower box body 8 arranged up and down. The top of the lower box body 8 is open. Figure 2 The lower box 8 is constructed with a rectangular section and a narrow section at its front. Crossbeams 10 and longitudinal beams 11 are arranged in a cross-shaped pattern within the rectangular section. Both ends of these beams are connected to the inner wall of the lower box 8. Four mounting slots 12 are formed between the lower box 8, the crossbeams 10, and the longitudinal beams 11. Explosion-proof valves 3 are installed on the side walls of the lower box 8 at both ends of the longitudinal beam 11, and explosion-proof valves 13 are installed on the side walls of the lower box 8 on both sides of the longitudinal beam 11. An upper cover 9 is mated to the top of the lower box 8 to seal it.

[0026] The eight battery modules 1 are evenly distributed within the four mounting slots 12, meaning that each mounting slot 12 contains two battery modules 1. The length of the battery modules 1 can be appropriately adjusted based on the size of the corresponding mounting slots 12. Each battery module 1 includes multiple cells arranged along the length of the longitudinal beam 11, with an explosion-proof valve 2 provided on top of the cells.

[0027] Eight thermal insulation members are respectively arranged in one-to-one correspondence with eight battery modules 1. Each thermal insulation member includes a thermal insulation board 1 4, a thermal insulation board 2 5, two fixed foam blocks 6 and two pressure plates 7. The thermal insulation board 1 4 covers the top of the corresponding battery module 1 and is bonded to the battery module 1 by structural adhesive. A plurality of avoidance holes are sequentially spaced along the length direction of the thermal insulation board 1 4. The plurality of avoidance holes are respectively arranged in one-to-one correspondence with the plurality of battery cells of the battery module 1, and the explosion-proof valve 1 2 of the battery cell is adapted to the avoidance hole and passes through the avoidance hole. In this embodiment, the two pressure plates 7 of the thermal insulation member are respectively connected to the two pressure plates 7 of another thermal insulation member on the same straight line, that is, the two thermal insulation members on the same straight line share two pressure plates 7. The two pressure plates 7 are arranged above the thermal insulation board 1 4 and the plurality of avoidance holes on the thermal insulation board 1 4 are located between the two pressure plates 7. The two ends of the pressure plate 7 are respectively connected to the two ends of the lower box 8 by bolts. The two pressure plates 7 are also connected to the top of the crossbeam 10 by bolts. A fixing groove is formed on the top of each of the two pressure plates 7. Two fixed foam blocks 6 are respectively set in the fixing grooves of the two pressure plates 7. A gap is left between the two fixed foam blocks 6 to form an exhaust channel. The extension direction of the exhaust channel is consistent with the extension direction of the longitudinal beam 11. When a battery cell experiences thermal runaway, the explosion-proof valve 12 of the battery cell opens and releases leaked materials into the exhaust channel. The leaked materials flow rapidly along the exhaust channel to the two ends and both sides of the lower box 8. When the internal pressure of the battery box reaches the pressure setting value of the explosion-proof valve 23 and the explosion-proof valve 3 13, the explosion-proof valve 23 and the explosion-proof valve 3 13 open and release the thermal runaway leaked materials outside the battery box, ensuring the pressure balance inside and outside the battery system and the safety of each component, reducing the risk of heat spread, and at the same time, the heat insulation plate 14 can prevent the heat diffusion leaked materials from damaging the battery cell. Thermal insulation board 2 (5) is positioned above the two fixed foam blocks (6) and bonded to them with structural adhesive. Thermal insulation board 2 (5) is also bonded to the upper cover (9) with structural adhesive. This prevents thermal diffusion leakage from damaging the upper cover (9) and the remaining battery pack components. In this embodiment, thermal insulation boards 1 (4) and 2 (5) are constructed of mica or high-temperature ceramic. In this embodiment, pressure plate 7 is constructed of metal, which offers high strength and can withstand the significant pressures generated by thermal runaway.

[0028] In this embodiment, a thermal runaway sensor is also mounted on the inner wall of the lower housing 8. When thermal runaway occurs, the leak triggers the sensor, which sounds an alarm to alert the driver. The thermal runaway sensor can be a smoke sensor, a pressure sensor, or a temperature sensor.

[0029] The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above-mentioned embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0030] The above-described embodiments merely represent several implementations of the present invention. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that a person skilled in the art would be able to make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements fall within the scope of protection of the present invention. Therefore, the scope of protection of the present utility model patent shall be determined by the appended claims.

Claims

1. A CTP battery pack with thermal runaway protection function, comprising a battery box and a plurality of battery modules (1) arranged inside the battery box; characterized in that: It also includes a plurality of heat insulating members arranged inside the battery box, the plurality of heat insulating members respectively covering the top of the plurality of battery modules (1), each heat insulating member being provided with an exhaust channel, the top of the battery cell of the battery module (1) being provided with an explosion-proof valve (2) capable of releasing leaked materials into the corresponding exhaust channel; and the battery box being provided with explosion-proof valves (3) on both side walls in the longitudinal direction of the exhaust channel.

2. The CTP battery pack with thermal runaway protection function according to claim 1, characterized in that: The heat insulation component includes a heat insulation board 1 (4) and a heat insulation board 2 (5), the heat insulation board 1 (4) covers the top of the corresponding battery module (1), and a plurality of avoidance holes are opened through the heat insulation board 1 (4), and the explosion-proof valves 1 (2) of the plurality of battery cells of the battery module (1) respectively pass through the plurality of avoidance holes; the heat insulation board 2 (5) is connected to the top of the battery box and two fixed foam blocks (6) are connected to the side of the heat insulation board 2 (5) facing the heat insulation board 1 (4), a gap is left between the two fixed foam blocks (6) to form the exhaust channel, and the plurality of avoidance holes of the heat insulation board 1 (4) are all located between the two fixed foam blocks (6).

3. The CTP battery pack with thermal runaway protection function according to claim 2, characterized in that: The heat insulating member further comprises two pressing plates (7), both of which are arranged above the heat insulating plate 1 (4) and the plurality of avoidance holes of the heat insulating plate 1 (4) are located between the two pressing plates (7), both ends of the pressing plates (7) are connected to the battery box to compress the corresponding battery module (1) and the heat insulating plate 1 (4), a fixing groove is formed on the top of the pressing plate (7), and two fixing foam blocks (6) are respectively arranged in the fixing grooves of the two pressing plates (7).

4. The CTP battery pack with thermal runaway protection function according to claim 3, characterized in that: The pressing plate (7) is made of a metal plate.

5. The CTP battery pack with thermal runaway protection function according to claim 2, characterized in that: The heat insulation board (4) is made of mica board or ceramic board, and the heat insulation board (4) is bonded to the top of the battery module (1) by structural adhesive.

6. The CTP battery pack with thermal runaway protection function according to claim 2, characterized in that: The second heat insulation board (5) is made of mica board or ceramic board, and the second heat insulation board (5) is bonded to the top of the fixed foam block (6) and the top of the battery box through structural adhesive.

7. The CTP battery pack with thermal runaway protection function according to claim 2, characterized in that: The battery box comprises a lower box body (8) and an upper cover plate (9); the top of the lower box body (8) is open and a plurality of battery modules (1) are arranged in the lower box body (8); the upper cover plate (9) is cooperatively connected with the top of the lower box body (8) to seal the lower box body (8); and the second heat insulation plate (5) of each heat insulation component is connected to the upper cover plate (9).

8. The CTP battery pack with thermal runaway protection function according to claim 7, characterized in that: The lower box body (8) is provided with a vertically cross-connected crossbeam (10) and a longitudinal beam (11). The crossbeam (10) and the longitudinal beam (11) divide the interior of the lower box body (8) into four installation slots (12). A battery module (1) is provided in each installation slot (12).

9. The CTP battery pack with thermal runaway protection function according to claim 1, characterized in that: A thermal runaway sensor is installed on the inner wall of the battery box.

10. The CTP battery pack with thermal runaway protection function according to claim 1, characterized in that: Explosion-proof valves (13) are installed on both side walls of the battery box in the width direction of the exhaust channel.

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