CTP battery thermal runaway protection structure and battery pack

Abstract

The utility model provides a CTP battery thermal runaway protection structure and a battery pack, and relates to the technical field of battery thermal runaway, a plurality of exhaust hoods are respectively arranged on a plurality of battery cells, and the exhaust hoods cover explosion-proof valves of the battery cells, so that the explosion-proof valves of the battery cells are positioned in a sealed channel, and the explosion-proof valves of the battery cells are positioned in the sealed channel; the gas-guide tube can be respectively communicated with the plurality of exhaust hoods, and one end of the gas-guide tube extends out of the box body provided with the battery cells, so that when one battery cell is subjected to thermal runaway, high-temperature substances or gas generated by the thermal runaway of the battery cell can be discharged into the gas-guide tube through the exhaust hoods, and is discharged out of the box body through the gas-guide tube; therefore, other battery cells can be separated from high-temperature substances or gases generated by thermal runaway of the battery cell, the purpose of thermoelectric separation is achieved, and the risk of thermal diffusion can be reduced.

Description

Technical Field

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

[0002] At present, the traditional battery pack model adopts a three-level assembly mode of cell-module-PACK. In this mode, the battery cells are first assembled into modules, and then the modules are installed in the battery pack. This assembly mode requires multiple links, including battery cell assembly, module installation, battery pack packaging, etc., which not only increases production costs, but may also lead to low production efficiency.

[0003] In order to reduce production costs and improve production efficiency, many automobile manufacturers and battery manufacturers have begun to explore new battery pack structures and technologies, such as CTP technology. Chinese patent CN219801140U discloses a CTP battery installation structure and battery pack, which accommodates multiple single cells through a receiving part. Multiple single cells are stacked and arranged on the bottom plate of the installation box and located between two cross beams. The multiple single cells are abutted and pre-positioned in the stacking direction by the cross beam, so that multiple single cells can be directly placed in the box.

[0004] However, in order to meet the higher energy density requirements of the above-mentioned CTP batteries, the spacing between battery cells is very small. When a battery cell experiences thermal runaway, since the distance between adjacent battery cells is very small, there is a great possibility that other battery cells will also experience thermal runaway, thereby causing a safety accident. Utility Model Content

[0005] In view of this, the utility model proposes a CTP battery thermal runaway protection structure and a battery pack to solve the problem of heat diffusion that is easily caused when the CTP battery has thermal runaway.

[0006] The technical solution of the utility model is achieved in this way:

[0007] In a first aspect, the utility model provides a CTP battery thermal runaway protection structure, which includes a plurality of exhaust hoods and air ducts;

[0008] Each of the exhaust hoods is disposed on a plurality of battery cells, and the exhaust hood covers the explosion-proof valves of the battery cells;

[0009] The air duct is communicated with the plurality of exhaust hoods respectively, and one end of the air duct extends to the outside of the box where the battery core is installed, so as to discharge the high-temperature substance or gas in the air duct to the outside of the box.

[0010] On the basis of the above technical solution, preferably, the CTP battery thermal runaway protection structure also includes a plurality of integrated busbars, each of the integrated busbars is provided with a plurality of air vents, each of the integrated busbars is mounted on a plurality of the battery cells, and the plurality of air vents are respectively arranged in one-to-one correspondence with the explosion-proof valves on the plurality of the battery cells, the exhaust hood is mounted on the integrated busbar, and the exhaust hood and the plurality of air vents are arranged relative to each other.

[0011] On the basis of the above technical solution, preferably, a snap-fit ​​structure is provided on the exhaust hood, and the exhaust hood is installed on the integrated busbar through the snap-fit ​​structure.

[0012] On the basis of the above technical solution, preferably, the CTP battery thermal runaway protection structure further includes a sealing strip, and the sealing strip is arranged at the clamping position between the buckle structure and the integrated busbar.

[0013] On the basis of the above technical solution, preferably, the CTP battery thermal runaway protection structure also includes a first mica paper, the first mica paper is attached to the integrated busbar, and the first mica paper covers the plurality of air holes.

[0014] On the basis of the above technical solution, preferably, the thickness of the first mica paper is in the range of greater than or equal to 0.2 mm and less than or equal to 0.5 mm.

[0015] On the basis of the above technical solution, preferably, the CTP battery thermal runaway protection structure also includes a plurality of adapters, one end of the plurality of adapters is respectively connected to the plurality of exhaust hoods, and the other end of the plurality of adapters is connected to the air duct.

[0016] On the basis of the above technical solution, preferably, the CTP battery thermal runaway protection structure further includes a second mica paper, and the second mica paper is attached to the inner wall of the exhaust hood.

[0017] On the basis of the above technical solution, preferably, the CTP battery thermal runaway protection structure further includes a pressure relief valve, which is arranged on the box body, and one end of the air guide pipe extends to communicate with the pressure relief valve.

[0018] In a second aspect, the utility model also provides a battery pack, which includes the CTP battery thermal runaway protection structure as described above.

[0019] The CTP battery thermal runaway protection structure and battery pack of the utility model have the following beneficial effects compared with the prior art:

[0020] (1) By respectively arranging a plurality of exhaust hoods on a plurality of battery cells, and covering the exhaust hoods on the explosion-proof valves of the battery cells, so that the explosion-proof valves of the battery cells are located in a sealed channel, the air duct can be respectively connected to the plurality of exhaust hoods, and one end of the air duct extends to the outside of the box where the battery cells are installed. When thermal runaway occurs in one of the battery cells, the high-temperature substances or gases generated by the thermal runaway of the battery cell can be discharged into the air duct through the exhaust hood, and then discharged out of the box through the air duct, so that the other battery cells can be separated from the high-temperature substances or gases generated by the thermal runaway of the battery cell, thereby achieving the purpose of thermal and electrical separation and reducing the risk of heat diffusion;

[0021] (2) An integrated busbar is arranged on a plurality of battery cells, and a plurality of air vents on the integrated busbar are respectively provided with a plurality of explosion-proof valves corresponding to each other. The exhaust hood is installed on the integrated busbar through a snap-on structure, so that the exhaust hood can be easily covered on the explosion-proof valve of the battery cell. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0023] Figure 1 This is a three-dimensional diagram of the CTP battery thermal runaway protection structure of the utility model being arranged on the battery cell;

[0024] Figure 2 It is a three-dimensional diagram of the integrated busbar of the utility model;

[0025] Figure 3 It is a partial cross-sectional schematic diagram of the thermal runaway protection structure of the CTP battery of the utility model.

[0026] Reference numerals:

[0027] 1. Exhaust hood; 101. Buckle structure; 2. Air duct; 3. Battery cell; 31. Explosion-proof valve; 4. Box body; 5. Adapter; 6. Integrated busbar; 61. Air vent; 7. Sealing strip; 8. First mica paper; 9. Second mica paper; 10. Pressure relief valve. DETAILED DESCRIPTION

[0028] The following will be combined with the implementation of the utility model to clearly and completely describe the technical solutions in the implementation of the utility model. Obviously, the described implementation is only a part of the implementation of the utility model, not all of the implementations. Based on the implementation of the utility model, all other implementations obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0029] like Figure 1 and Figure 3 As shown, a CTP battery thermal runaway protection structure of the utility model includes a plurality of exhaust hoods 1 and an air duct 2;

[0030] Each of the exhaust hoods 1 is disposed on a plurality of battery cells 3, and the exhaust hood 1 covers the explosion-proof valve 31 of the battery cell 3;

[0031] The air duct 2 is connected to the plurality of exhaust hoods 1 respectively, and one end of the air duct 2 extends to the outside of the box 4 where the battery cells 3 are installed, so as to discharge the high-temperature substances or gases in the air duct 2 to the outside of the box 4 .

[0032] Specifically, the CTP battery thermal runaway protection structure can be set in the battery pack, and the CTP battery thermal runaway protection structure can discharge the high-temperature substances or gases generated in the battery pack due to thermal runaway of the battery cell 3, which can reduce the occurrence of the entire battery pack being burned due to thermal runaway of one battery cell 3, that is, it can reduce the risk of heat diffusion.

[0033] The CTP battery thermal runaway protection structure includes multiple exhaust hoods 1. In this embodiment, the exhaust hood 1 is shaped like a U-shaped plate. Each exhaust hood 1 can be set on multiple battery cells 3. Preferably, one exhaust hood 1 is set on the same row of battery cells 3, and the open end of the exhaust hood 1 is set toward the battery cell 3. The exhaust hood 1 covers the explosion-proof valve 31 of the battery cell 3, so that the explosion-proof valve 31 of the battery cell 3 is located in a sealed channel. Preferably, the exhaust hood 1 can be made of plastic, so that the exhaust hood 1 is an insulator, which can prevent the exhaust hood 1 from conducting multiple battery cells 3 and causing the battery cells 3 to short-circuit.

[0034] In addition, multiple exhaust hoods 1 can be connected to an air duct 2, and the gases in the multiple exhaust hoods 1 can be discharged into an air duct 2. One end of the air duct 2 can extend to the outside of the box 4 where the battery cells 3 are installed. It can also be said that one end of the air duct 2 is connected to the outside of the box 4.

[0035] When thermal runaway occurs in one of the battery cells 3, the high-temperature substances or gases generated by the thermal runaway of the battery cell 3 can be discharged into the air duct 2 through the exhaust hood 1, and discharged outside the box 4 through the air duct 2, so that other battery cells 3 can be separated from the high-temperature substances or gases generated by the thermal runaway of the battery cell 3, thereby achieving the purpose of thermal and electrical separation and reducing the risk of heat diffusion.

[0036] like Figure 1 and Figure 2 As shown, in some embodiments, the CTP battery thermal runaway protection structure also includes a plurality of integrated busbars 6, each of the integrated busbars 6 is provided with a plurality of air vents 61, each of the integrated busbars 6 is mounted on a plurality of the battery cells 3, and the plurality of air vents 61 are respectively arranged in one-to-one correspondence with the explosion-proof valves 31 on the plurality of the battery cells 3, the exhaust hood 1 is installed on the integrated busbar 6, and the exhaust hood 1 and the plurality of air vents 61 are arranged relative to each other.

[0037] Specifically, the CTP battery thermal runaway protection structure may also include a plurality of integrated busbars 6, each of which may be provided with a plurality of air vents 61. In the present embodiment, the air vents 61 are arranged in the middle of the integrated busbar 6, and the plurality of air vents 61 are arranged in a row along the length direction of the integrated busbar 6. When the integrated busbar 6 is installed on a plurality of battery cells 3, the plurality of air vents 61 may be arranged one-to-one with the explosion-proof valves 31 on the plurality of battery cells 3. The exhaust hood 1 may be installed on the integrated busbar 6, and the exhaust hood 1 may be arranged relative to the plurality of air vents 61, so that the plurality of explosion-proof valves 31 are located in a sealed channel formed by the exhaust hood 1. The exhaust hood 1 and the plurality of explosion-proof valves 31 may be quickly installed together in correspondence, thereby saving installation time.

[0038] like Figure 1 and Figure 3 As shown, in some embodiments, a snap-fit ​​structure 101 is provided on the exhaust hood 1 , and the exhaust hood 1 is installed on the integrated busbar 6 through the snap-fit ​​structure 101 .

[0039] Specifically, the exhaust hood 1 is a structure similar to a U-shaped plate, and the open end of the exhaust hood 1 can be provided with a snap-fit ​​structure 101. The open end of the exhaust hood 1 can be set on the integrated busbar 6. By pressing the exhaust hood 1 downward, the exhaust hood 1 can be snapped onto the integrated busbar 6 through the snap-fit ​​structure 101, so that the exhaust hood 1 can be conveniently covered on the explosion-proof valve 31 of the battery cell 3.

[0040] like Figure 3 As shown, in some embodiments, the CTP battery thermal runaway protection structure further includes a sealing strip 7 , and the sealing strip 7 is disposed at the snap connection between the snap structure 101 and the integrated busbar 6 .

[0041] Specifically, the CTP battery thermal runaway protection structure may further include a sealing strip 7, which may be disposed at the joint between the snap structure 101 and the integrated busbar 6. The sealing strip 7 may increase the airtightness of the joint and prevent high-temperature substances and gases generated by thermal runaway of the battery cell 3 from leaking from the joint.

[0042] like Figure 3 As shown, in some embodiments, the CTP battery thermal runaway protection structure also includes a first mica paper 8, the first mica paper 8 is attached to the integrated busbar 6, and the first mica paper 8 covers the plurality of air holes 61.

[0043] Specifically, the CTP battery thermal runaway protection structure may further include a first mica paper 8. In this embodiment, the first mica paper 8 may be a long thin sheet structure. The first mica paper 8 may be attached to the integrated busbar 6, and the first mica paper 8 covers a plurality of air holes 61. The first mica paper 8 has excellent thermal insulation properties, which can prevent high-temperature gas from transferring temperature to other battery cells 3, further reducing the risk of heat diffusion.

[0044] like Figure 3 As shown, in some embodiments, the thickness of the first mica paper 8 is in the range of greater than or equal to 0.2 mm and less than or equal to 0.5 mm.

[0045] Specifically, the thickness of the first mica paper 8 is relatively thin. In the present embodiment, the thickness of the first mica paper 8 is in the range of greater than or equal to 0.2 mm and less than or equal to 0.5 mm. Preferably, the thickness of the first mica paper 8 is 0.2 mm. The thickness of the first mica paper 8 cannot be too thick, otherwise, when the battery cell 3 thermally runs away from the valve, the first mica paper 8 cannot be broken, resulting in that the high-temperature gas cannot be discharged to the outside of the box 4 through the exhaust hood 1 and the air duct 2. The thickness of the first mica paper 8 cannot be too thin, otherwise, it will not have a heat-insulating effect.

[0046] like Figure 1 As shown, in some embodiments, the CTP battery thermal runaway protection structure also includes a plurality of adapters 5, one end of each of the plurality of adapters 5 is connected to each of the plurality of exhaust hoods 1, and the other end of each of the plurality of adapters 5 is connected to the air duct 2.

[0047] Specifically, the CTP battery thermal runaway protection structure may further include a plurality of adapters 5, and the plurality of adapters may be arranged in one-to-one correspondence with the plurality of exhaust hoods 1, and one end of an adapter 5 may be connected to an exhaust hood 1, and the other end of an adapter 5 may be connected to an air duct 2, so that a plurality of exhaust hoods 1 may be connected to an air duct 2. By arranging a plurality of adapters 5, it is convenient to arrange the air duct 2 in the box, and it is also convenient to connect a plurality of exhaust hoods 1 to the air duct 2.

[0048] like Figure 3 As shown, in some embodiments, the CTP battery thermal runaway protection structure further includes a second mica paper 9 , and the second mica paper 9 is attached to the inner wall of the exhaust hood 1 .

[0049] Specifically, the CTP battery thermal runaway protection structure may also include a second mica paper 9, which may be attached to the inner wall of the exhaust hood 1. The second mica paper 9 may separate the high-temperature substances and gases generated by the thermal runaway of the battery cell 3, thereby avoiding direct contact between the high-temperature substances and gases and the exhaust hood 1, and preventing the high-temperature substances and gases from breaking through the exhaust hood 1.

[0050] like Figure 1 As shown, in some embodiments, the CTP battery thermal runaway protection structure further includes a pressure relief valve 10 , which is disposed on the box body 4 , and one end of the air duct 2 extends to communicate with the pressure relief valve 10 .

[0051] Specifically, the CTP battery thermal runaway protection structure may further include a pressure relief valve 10, which may be disposed on the side wall of the housing 4, and the pressure relief valve 10 connects the inside and outside of the housing 4, one end of the air duct 2 extends to connect with the pressure relief valve 10, and the high-temperature gas generated when the battery cell 3 has thermal runaway is discharged into the air duct 2 through the exhaust hood 1, and when the air pressure in the air duct 2 reaches the critical point at which the pressure relief valve 10 sprays, the pressure relief valve 10 sprays to discharge the high-temperature gas to the outside of the housing 4, and when the pressure relief valve 10 does not spray, the air duct 2 and the outside of the housing 4 can be isolated, so that external pollutants such as dust and water can be prevented from entering the air duct 2.

[0052] On the other hand, Figure 1 As shown, a battery pack of the utility model includes the CTP battery thermal runaway protection structure as described above.

[0053] The battery pack in this embodiment and the above-mentioned CTP battery thermal runaway protection structure are based on the same inventive concept, have the same or similar embodiments and beneficial effects, and will not be described in detail here.

[0054] When the CTP battery thermal runaway protection structure provided by the utility model is used, the integrated busbar 6 is first arranged on multiple battery cells 3, and multiple air vents 61 and explosion-proof valves 31 of multiple battery cells 3 are arranged one by one, then the exhaust hood 1 is arranged on the integrated busbar 6, so that the exhaust hood 1 and the multiple air vents 61 are arranged relatively, and the exhaust hood 1 is connected to the air duct 2 through the adapter 5, and finally one end of the air duct 2 is extended to the outside of the box 4 where the battery cells 3 are installed. When one of the battery cells 3 has a thermal runaway, the high-temperature substance or gas generated by the thermal runaway of the battery cell 3 can be discharged into the air duct 2 through the exhaust hood 1, and discharged to the outside of the box 4 through the air duct 2, so that other battery cells 3 can be separated from the high-temperature substance or gas generated by the thermal runaway of the battery cell 3, so as to achieve the purpose of thermoelectric separation and reduce the risk of heat diffusion.

[0055] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A CTP battery thermal runaway protection structure, characterized in that: It comprises a plurality of exhaust hoods (1) and air ducts (2); Each of the exhaust hoods (1) is arranged on a plurality of battery cells (3), and the exhaust hood (1) covers the explosion-proof valve (31) of the battery cell (3); The air duct (2) is respectively connected to the plurality of exhaust hoods (1), and one end of the air duct (2) extends to the outside of a box (4) on which the battery cell (3) is installed, so as to discharge high-temperature substances or gases in the air duct (2) to the outside of the box (4).

2. The CTP battery thermal runaway protection structure according to claim 1, characterized in that: It also comprises a plurality of integrated busbars (6), each of the integrated busbars (6) being provided with a plurality of air vents (61), each of the integrated busbars (6) being mounted on a plurality of the battery cells (3), and the plurality of air vents (61) being arranged in one-to-one correspondence with the explosion-proof valves (31) on the plurality of the battery cells (3), and the exhaust hood (1) being mounted on the integrated busbars (6), and the exhaust hood (1) and the plurality of air vents (61) being arranged in a relative manner.

3. The CTP battery thermal runaway protection structure according to claim 2, characterized in that: The exhaust hood (1) is provided with a snap-fit ​​structure (101), and the exhaust hood (1) is installed on the integrated busbar (6) via the snap-fit ​​structure (101).

4. The CTP battery thermal runaway protection structure according to claim 3, characterized in that: It also comprises a sealing strip (7), wherein the sealing strip (7) is arranged at the clamping position between the buckle structure (101) and the integrated busbar (6).

5. The CTP battery thermal runaway protection structure according to claim 2, characterized in that: It also includes a first mica paper (8), wherein the first mica paper (8) is attached to the integrated busbar (6), and the first mica paper (8) covers the plurality of air holes (61).

6. The CTP battery thermal runaway protection structure according to claim 5, characterized in that: The thickness of the first mica paper (8) is in the range of greater than or equal to 0.2 mm and less than or equal to 0.5 mm.

7. The CTP battery thermal runaway protection structure according to claim 1, characterized in that: It also comprises a plurality of adapters (5), one end of each of the plurality of adapters (5) being connected to the plurality of exhaust hoods (1) respectively, and the other end of each of the plurality of adapters (5) being connected to the air duct (2).

8. The CTP battery thermal runaway protection structure according to claim 1, characterized in that: It also comprises a second mica paper (9), wherein the second mica paper (9) is attached to the inner wall of the exhaust hood (1).

9. The CTP battery thermal runaway protection structure according to claim 1, characterized in that: It also comprises a pressure relief valve (10), wherein the pressure relief valve (10) is arranged on the box body (4), and one end of the air guide pipe (2) extends to communicate with the pressure relief valve (10).

10. A battery pack, characterized in that: The invention comprises a CTP battery thermal runaway protection structure as described in any one of claims 1 to 9.

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