Thermal runaway suppression member and battery pack

Abstract

The utility model discloses a thermal runaway restraining piece which is used for cooling a battery and comprises a body and a valve installed on the body, cooling liquid is contained in the body, and the valve is provided with an overflow direction for the cooling liquid to flow outwards from the interior of the body through the valve. The valve comprises at least two sealing parts which are arranged along the overflow direction; when the battery is at a normal working temperature, each sealing part is closed; and when the battery reaches a set temperature, each sealing part is opened, and the cooling liquid in the body can flow out through the valve to cool the battery. According to the utility model, the battery can be cooled efficiently and quickly, heat diffusion is inhibited, and larger safety accidents are avoided. The utility model further discloses a battery pack.

Description

TECHNICAL FIELD

[0001] The utility model relates to battery technology field especially relates to a thermal runaway suppression piece and battery pack. BACKGROUND

[0002] As the core component of electric vehicles, batteries have been an important part of China's new energy vehicle industry chain.

[0003] In addition to the requirement of high energy density, the safety problem of batteries in use has been paid more and more attention. When the battery is overcharged, overdischarged, extruded or collided by the outside world or has quality defects, etc. leading to internal short circuit, thermal runaway may occur, and a large amount of heat energy will be released once thermal runaway occurs. If there is no effective measure to deal with it in a short time, it is easy to cause greater safety accidents. SUMMARY

[0004] In order to overcome the shortcomings and deficiencies existing in the prior art, the purpose of the utility model is to provide a thermal runaway suppression piece and battery pack, which can efficiently and quickly cool the battery, inhibit heat diffusion and avoid causing greater safety accidents.

[0005] The purpose of the utility model is realized by the following technical scheme:

[0006] A thermal runaway suppression piece for cooling a battery, comprising a body and a valve mounted on the body, the body containing a cooling liquid, the valve having an overflow direction for the cooling liquid to flow out of the body through the valve, the valve comprising at least two sealing portions arranged along the overflow direction; when the battery is at a normal working temperature, each sealing portion is closed; when the battery reaches a set temperature, each sealing portion is open, and the cooling liquid in the body can flow out through the valve to cool the battery.

[0007] In an embodiment, the set temperature is the battery thermal runaway temperature.

[0008] In an embodiment, the body is a liquid cooling plate, and the liquid cooling plate is provided with a flow channel containing the cooling liquid, and the valve is in communication with the flow channel.

[0009] In an embodiment, the sealing portion of the valve comprises at least a first sealing portion and a second sealing portion, the valve has a passage for the cooling liquid to flow out, and the first sealing portion and the second sealing portion are both arranged on the passage.

[0010] In an embodiment, the first sealing portion comprises a hot melt layer, and the hot melt layer melts at the set temperature.

[0011] In an embodiment, the second sealing part comprises a deformation component which deforms to open the second sealing part at the set temperature.

[0012] In an embodiment, the second sealing part further comprises a second baffle plate for sealing the passage, the second baffle plate being provided with a through hole;

[0013] The deformation component comprises a deformation structure and a stopper;

[0014] When the battery is at a normal working temperature, the stopper covers the through hole on the second baffle plate; when the battery reaches a set temperature, the stopper is driven by the deformation structure to move away from the through hole on the second baffle plate, so that the cooling liquid can pass through the through hole on the second baffle plate in the overflow direction.

[0015] In an embodiment, the second sealing part further comprises a hollow member sealingly arranged in the passage, the hollow member having a first baffle plate upstream and a second baffle plate downstream along the overflow direction, and a hollow cavity structure formed by a ring wall, the first baffle plate and the ring wall downstream of the second baffle plate being provided with through holes; the hollow member further has a third baffle plate, the third baffle plate and the first baffle plate being arranged on two sides of the second baffle plate, and the first baffle plate, the second baffle plate and the third baffle plate being connected with the ring wall;

[0016] The deformation structure comprises an elastic deformation member and a thermal expansion member; the elastic deformation member and the stopper are located between the first baffle plate and the second baffle plate, two ends of the elastic deformation member contacting the stopper and the first baffle plate respectively, and the stopper covering the through hole of the second baffle plate when the battery is at a normal working temperature; one end of the thermal expansion member contacts the third baffle plate, and the other end passes through the through hole of the second baffle plate and contacts the stopper;

[0017] The thermal expansion member expands at the set temperature to drive the stopper to press the elastic deformation member, the elastic deformation member is forced to contract, and the stopper moves away from the through hole of the second baffle plate, so that the cooling liquid can flow through the first baffle plate, the second baffle plate and the through hole on the ring wall in sequence.

[0018] In an embodiment, the through hole of the first baffle plate is arranged to be spaced apart from the elastic deformation member; the inner wall of the through hole of the second baffle plate is arranged to be spaced apart from the thermal expansion member; and the through hole of the ring wall is arranged to be spaced apart from the thermal expansion member.

[0019] In an embodiment, the thermal expansion piece comprises a thermal expansion material and a receiving piece; the receiving piece comprises a contact column and a contact ring connected to each other, one end of the contact column away from the contact ring contacts the stopper, the contact ring is in abutment with the inner wall of the ring wall, the receiving piece receives the thermal expansion material at least between the contact ring and the third stopper plate, the thermal expansion material is extruded to the direction of the stopper after thermal expansion, the receiving piece is extruded to the stopper, and the stopper is separated from the through hole of the second stopper plate.

[0020] In an embodiment, the contact column is a hollow column structure with an opening at one end away from the stopper, and the thermal expansion material is also received in the hollow of the contact column.

[0021] In an embodiment, the through hole on the ring wall is located between the second stopper plate and the contact ring.

[0022] In an embodiment, the first sealing part comprises a hot melt layer which melts at the set temperature; and the second sealing part is located upstream of the first sealing part along the overflow direction.

[0023] The utility model also provides a battery pack comprising the thermal runaway suppression piece.

[0024] In an embodiment, the battery pack comprises a battery box, and the body is a liquid cooling plate integrated on the battery box.

[0025] The thermal runaway suppression piece has a valve, and multiple sealing parts arranged along the overflow direction on the valve are all opened when the set temperature is reached, so that the cooling liquid in the body flows out of the valve to the battery for cooling, which is beneficial to cooling the battery in time, suppressing heat diffusion and avoiding causing greater safety accidents. In addition, the valve comprises at least two sealing parts arranged along the overflow direction, and when all the sealing parts are opened, the cooling liquid can still flow out of the valve. Compared with only one sealing part, the valve is more reliable, and even if one of the sealing parts is damaged and opened due to vibration or impact, the remaining sealing parts can seal the valve, avoiding the valve from being opened to flow out the cooling liquid when the set temperature is not reached, causing the thermal runaway suppression piece to fail, and improving the reliability and stability of the thermal runaway suppression piece. BRIEF DESCRIPTION OF DRAWINGS

[0026] In order to more clearly illustrate the technical scheme of the embodiments of the utility model, the following will briefly introduce the drawings needed to be used in the embodiments. It should be understood that the following drawings only show some embodiments of the utility model, and should not be regarded as a limitation to the scope. For those skilled in the art, other related drawings can also be obtained without creative labor.

[0027] Figure 1 is a perspective view of a box body of a battery box of an embodiment of the utility model;

[0028] Figure 2 is a perspective view of a valve of an embodiment of the utility model;

[0029] Figure 3 is Figure 2 a cross section view of a simplified sealing part of the utility model;

[0030] Figure 4 is a perspective view of a second sealing part of an embodiment of the utility model;

[0031] Figure 5 is Figure 4 a cross section view when the battery reaches the set temperature;

[0032] Figure 6 is Figure 4 a cross section view when the battery is at normal working temperature;

[0033] Figure 7 is a valve cross section view when the battery reaches the set temperature;

[0034] Figure 8 is a valve cross section view when the battery is at normal working temperature;

[0035] Figure 9 is a liquid cooling plate cross section view.

[0036] In the drawing: 100, thermal runaway suppression piece; 1, body; 11, flow channel; 2, valve; 21, first sealing part; 22, second sealing part; 221, hollow piece; 221A, first baffle; 221B, second baffle; 221C, third baffle; 221D, ring wall; 221E, through hole; 222, deformation part; 222F, elastic deformation piece; 222G, stop block; 222H, thermal expansion piece; 222H1, thermal expansion material; 222H2, receiving piece; 222H21, abutting column; 222H22, abutting ring; 23, channel; 3, quick connector; 400, box body. DETAILED DESCRIPTION

[0037] The specific embodiments of the utility model will be described in detail below with reference to the drawings. Obviously, the described embodiments are only part of the embodiments of the utility model, not all the embodiments. Based on the description of the utility model, all other embodiments obtained by those skilled in the art without creative labor belong to the scope of protection of the utility model.

[0038] In the description of the utility model, unless another definite provision and limitation, the term "arrange", "install", "connect" and so on should do broad sense understanding, for example, can be fixed connection, also can be detachable connection, or integrally connected, can be mechanical connection, also can be electrical connection, can be direct connection, also can be indirectly connected through intermediate medium. For ordinary skilled in the art, the specific meaning of the above terms can be understood according to specific circumstances.

[0039] The orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", "front", "back", "top", "bottom", "inner", "outer" and the like is based on the orientation or positional relationship shown in the drawings, or is the orientation or positional relationship commonly placed when the utility model product is used, and is merely for the convenience of description and simplification of the description, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the utility model.

[0040] The terms "first", "second", "third" and the like are merely for distinguishing similar attributes, and do not indicate or imply relative importance or a particular order.

[0041] The terms "include", "contain" or any other variant thereof are intended to cover non-exclusive inclusion, in addition to containing the listed elements, other elements not explicitly listed can also be contained.

[0042] The utility model provides a kind of thermal runaway suppression piece 100, such as Figures 1 to 3As shown in FIG. 1, a battery (not shown) cooling device comprises a body 1 and a valve 2 mounted on the body 1, the body 1 contains cooling liquid, the valve 2 has an overflow direction S for the cooling liquid to flow out of the body 1 through the valve 2, and the valve 2 comprises at least two sealing portions arranged along the overflow direction S. When the battery is at a normal working temperature, each sealing portion is closed; when the battery reaches a set temperature, each sealing portion is opened, and the cooling liquid in the body 1 can flow out through the valve 2 to cool the battery. In this embodiment, the thermal runaway suppression device 100 has the valve 2, when the battery is at a normal working temperature, each sealing portion on the valve 2 is closed, and the cooling liquid is sealed in the body 1; when the set temperature (such as the battery thermal runaway temperature) is reached, each sealing portion on the valve 2 is opened to allow the cooling liquid in the body 1 to flow out through the valve 2 to cool the battery, which is beneficial to timely and efficiently cool the battery, suppress heat diffusion, and avoid causing greater safety accidents; in addition, the valve 2 of this embodiment comprises at least two sealing portions arranged along the overflow direction S, when each sealing portion is opened, the cooling liquid can still flow out through the valve 2, which is more reliable than only one sealing portion, even if one of the sealing portions is damaged and opened due to vibration or impact, the remaining sealing portions can seal the valve 2, avoiding the valve 2 from opening to flow out the cooling liquid when the set temperature is not reached, causing the thermal runaway suppression device 100 to fail, and improving the reliability and stability of the thermal runaway suppression device 100.

[0043] As an embodiment, the set temperature is the battery thermal runaway temperature.

[0044] As an embodiment, the set temperature is 100°C.

[0045] As an embodiment, as shown in FIG. 1, Figure 1 and Figure 9 As shown in FIG. 1, the body 1 is a liquid cooling plate, the liquid cooling plate is provided with a flow channel 11 containing cooling liquid, and the valve 2 communicates with the flow channel 11. Among them, the body 1 is a liquid cooling plate of a battery pack (not shown), which can simplify the structure, save volume and cost, and can be used as a thermal runaway suppression device 100 by mounting the above-mentioned valve 2 on the liquid cooling plate. When the battery is working normally, the cooling liquid in the liquid cooling plate can be used for cooling and thermal management of the battery pack; when the battery has thermal runaway and reaches the set temperature, each sealing portion of the valve 2 is opened, and the cooling liquid in the liquid cooling plate flows out to cool the battery in time, efficiently and quickly, and suppress heat diffusion; the liquid cooling plate is provided with a quick connector 3 for the cooling liquid outside the battery pack to flow into and out of the liquid cooling plate. Of course, in another embodiment, the body 1 can also be a spray pipeline (not shown) of the battery pack, and the valve 2 is mounted on the spray pipeline.

[0046] As an embodiment, as shown in FIG. 1, Figure 1As shown, when the body 1 is a liquid cooling plate, the valve 2 is provided with multiple valves 2, and the multiple valves 2 are arranged at intervals on the liquid cooling plate, so as to avoid the case that when only one valve 2 is provided, the valve 2 is far away from the thermal runaway point and cannot be opened in time.

[0047] As an embodiment, as shown in Figure 1 As shown, the multiple valves 2 are arranged at intervals along the edge of the liquid cooling plate, so as to avoid the case that when the battery is arranged on the upper surface of the liquid cooling plate, the valve 2 interferes with the battery.

[0048] As an embodiment, as shown in Figure 2 and Figure 3 As shown, the sealing part of the valve 2 at least includes a first sealing part 21 and a second sealing part 22, the valve 2 has a channel 23 for the cooling liquid to flow out, and the first sealing part 21 and the second sealing part 22 are arranged on the channel 23.

[0049] As an embodiment, the first sealing part 21 includes a hot melt layer, and the hot melt layer melts at a set temperature; the hot melt layer can be made of modified polyethylene material.

[0050] As an embodiment, as shown in Figures 2 to 6 As shown, the second sealing part 22 includes a deformation component 222, and at a set temperature, the deformation component 222 deforms to open the second sealing part 22. Specifically, the first sealing part 21 includes a hot melt layer, and the second sealing part 22 includes a deformation component 222, so that the second sealing part 22 and the first sealing part 21 are in different states at a set temperature, avoiding the case that when only two sealing parts are arranged, they are easily damaged and failed due to non-temperature factors, and improving the stability and reliability of the valve 2. In addition to the sealing part, the main body of the valve 2 is made of metal material.

[0051] As an embodiment, as shown in Figures 4 to 9 As shown, the second sealing part 22 further includes a second baffle 221B for blocking the channel 23, and the second baffle 221B is provided with a through hole 221E; the deformation component 222 includes a deformation structure and a stop block 222G; when the battery is at a normal working temperature, the stop block 222G covers the through hole 221E on the second baffle 221B; when the battery reaches a set temperature, the state of the deformation structure changes, so that the stop block 222G is separated from the through hole 221E of the second baffle 221B under the action of the deformation structure, so that the cooling liquid can pass through the through hole 221E on the second baffle 221B along the overflow direction S.

[0052] As an embodiment, as shown in Figures 4 to 9As shown, the second sealing part 22 further comprises a hollow member 221 sealed in the channel 23. In the overflow direction S, the hollow member 221 has a first baffle 221A upstream, a second baffle 221B downstream, and a hollow cavity structure with a ring wall 221D around. The first baffle 221A and the ring wall 221D downstream of the second baffle 221B are both provided with through holes 221E. The through holes 221E on the first baffle 221A, the second baffle 221B and the ring wall 221D can communicate with each other. The hollow member 221 further has a third baffle 221C, which is arranged on the two sides of the second baffle 221B with the first baffle 221A. The first baffle 221A, the second baffle 221B and the third baffle 221C are all connected with the ring wall 221D.

[0053] The deformation component 222 comprises a deformation structure and a stopper 222G. The deformation structure comprises an elastic deformation member 222F and a thermal expansion member 222H. The elastic deformation member 222F and the stopper 222G are located between the first baffle 221A and the second baffle 221B. The elastic deformation member 222F can be a spring. The two ends of the elastic deformation member 222F respectively contact the stopper 222G and the first baffle 221A. The stopper 222G covers the through hole 221E of the second baffle 221B when the battery is at a normal working temperature. The distance between the first baffle 221A and the second baffle 221B is less than the length of the elastic deformation member 222F in a natural state. When the stopper 222G covers the through hole 221E of the second baffle 221B, the elastic deformation member 222F is in a compressed state, thereby having a pressure on the stopper 222G in the direction of the second baffle 221B, so that the stopper 222G can tightly adhere to the second baffle 221B, avoiding liquid leakage through the through hole 221E of the second baffle 221B. One end of the thermal expansion member 222H contacts the third baffle 221C, and the other end passes through the through hole 221E of the second baffle 221B and contacts the stopper 222G.

[0054] The thermal expansion member 222H expands at a set temperature, driving the stopper 222G to press the elastic deformation member 222F. The elastic deformation member 222F is further contracted under stress, and the stopper 222G is separated from the through hole 221E of the second baffle 221B. Therefore, the cooling liquid can flow through the through holes 221E on the first baffle 221A, the second baffle 221B and the ring wall 221D in the overflow direction S, and then flow through the second sealing part 22 and out of the body 1, thereby cooling the battery.

[0055] As an embodiment, as shown in Figure 5 and Figure 6As shown, no matter whether the battery is in normal working temperature or reaches the set temperature, the through hole 221E of the first baffle 221A is spaced apart from the elastic deformation member 222F; the inner wall of the through hole 221E of the second baffle 221B is spaced apart from the thermal expansion member 222H; and the through hole 221E of the ring wall 221D is spaced apart from the thermal expansion member 222H. Thus, the elastic deformation member 222F or the thermal expansion member 222H is prevented from blocking the cooling liquid from passing through the corresponding through hole 221E.

[0056] As an implementation form, as shown in Figures 5 to 9 As shown, the thermal expansion member 222H comprises a thermal expansion material 222H1 and a receiving member 222H2; the receiving member 222H2 comprises an abutting column 222H21 and an abutting ring 222H22 connected to each other, the abutting column 222H21 contacts the block 222G at an end away from the abutting ring 222H22, the abutting ring 222H22 abuts the inner wall of the ring wall 221D, and the receiving member 222H2 receives the thermal expansion material 222H1 at least between the abutting ring 222H22 and the third baffle 221C. After the thermal expansion material 222H1 is heated and expanded, the receiving member 222H2 is pressed in the direction of the block 222G, the block 222G is pressed by the receiving member 222H2, the block 222G is separated from the through hole 221E of the second baffle 221B, and the through holes 221E on the valve 2 are communicated to form a passage to allow the cooling liquid to flow out of the body 1 through the valve 2. The thermal expansion material 222H1 can be paraffin wax, which is solid in the normal working state of the battery and is melted into liquid and expanded when the battery reaches the set temperature.

[0057] As an implementation form, as shown in Figure 5 and Figure 6 As shown, the abutting column 222H21 is a hollow column structure with an opening at an end away from the block 222G, the space between the abutting ring 222H22 and the third baffle 221C is communicated with the hollow part of the abutting column 222H21, and the thermal expansion material 222H1 is also received in the hollow part of the abutting column 222H21. Thus, the receiving member 222H2 can receive more thermal expansion material 222H1, so as to increase the pressure on the receiving member 222H2 from the expansion of the thermal expansion material 222H1 when the battery reaches the set temperature, further increase the pushing force on the block 222G, ensure that the block 222G is separated from the through hole 221E of the second baffle 221B, and improve the stability of the opening of the second sealing portion 22 when the battery reaches the set temperature.

[0058] As an implementation form, as shown in Figure 5 and Figure 6As shown, the through hole 221E on the ring wall 221D is located between the second baffle 221B and the abutting ring 222H22, avoiding the through hole 221E downstream of the second baffle 221B being blocked by the thermal expansion member 222H.

[0059] As an implementation, as shown in Figures 5 to 8 As shown, the passage 23 of the valve 2 is turned at the second sealing portion 22, and the second sealing portion 22 is located at the turning position, so that the cooling liquid flowing through the through hole 221E of the first baffle 221A and the second baffle 221B can flow out from the through hole 221E on the ring wall 221D between the second baffle 221B and the abutting ring 222H22.

[0060] As an implementation, as shown in Figures 5 to 8 As shown, along the overflow direction S, the second sealing portion 22 is located upstream of the first sealing portion 21. In this implementation, the hot melt layer of the first sealing portion 21 is prevented from directly contacting the cooling liquid when the battery is in the normal working state, so that the hot melt layer cannot be affected by the cooling liquid and cannot melt in time when the battery reaches the set temperature; the thermal expansion material 222H1 of the second sealing portion 22 is less affected by the cooling liquid due to the spacing of the block 222G and the abutting member 222H2; thus, this implementation can improve the timeliness of opening of the valve 2. Wherein, the second sealing portion 22 is adhered to the inner wall of the passage 23 by a colloid, and along the overflow direction S, the first sealing portion 21 can be arranged at the downstream end of the passage 23 by adhesion, interference fit and the like, facilitating installation.

[0061] Specifically, as shown in Figures 2 to 8 As shown, the first sealing portion 21 and the second sealing portion 22 are arranged on the passage 23 of the valve 2, and along the overflow direction S, the second sealing portion 22 is located upstream of the first sealing portion 21; when at the normal working temperature of the battery, as shown in Figure 1 、 Figure 6 and Figure 8 As shown, the block 222G covers the through hole 221E of the second baffle 221B, and the first sealing portion 21 and the second sealing portion 22 are both closed, that is, the valve 2 is in a closed state, and the cooling liquid cannot be discharged out of the body 1 through the valve 2; when at the set temperature, as shown in Figure 1 、 Figure 5 and Figure 7As shown, the thermal expansion member 222H expands to drive the block 222G to extrude the elastic deformation member 222F, the elastic deformation member 222F is forced to shrink, the block 222G is separated from the through hole 221E of the second baffle 221B, the through hole 221E on the first baffle 221A, the second baffle 221B and the ring wall 221D are communicated with each other, the second sealing portion 22 is opened, and the heat melting layer of the first sealing portion 21 is also melted by heat, so that the first sealing portion 21 is also opened, so that the cooling liquid in the body 1 flows along the overflow direction S through the through hole 221E on the first baffle 221A, the second baffle 221B and the ring wall 221D in turn, and then flows out along the channel 23 to the first sealing portion 21, so that the battery is cooled.

[0062] As an embodiment, the two ends of the elastic deformation member 222F are connected with the block 222G and the first baffle 221A respectively, the abutting column 222H21 passes through the through hole 221E of the second baffle 221B and is connected with the block 222G, thereby facilitating to improve the structural stability.

[0063] The utility model also provides a battery pack contains above-mentioned thermal runaway suppression member 100.

[0064] As an embodiment, as shown in Figure 1 , Figure 3 and Figure 9 As shown, the battery pack also includes a battery box, and the body 1 is a liquid cooling plate integrated on the battery box. Specifically, the battery is placed in the battery box, the battery box includes a box body 400 and a box cover (not shown), and the liquid cooling plate is integrated on the box body 400. The plurality of sealing portions of the utility model are opened when reaching the set temperature (such as the battery thermal runaway temperature), so that the cooling liquid in the body 1 flows out to the battery through the valve 2 for cooling, which is beneficial to cooling the battery in time, inhibiting heat diffusion and avoiding causing greater safety accidents; the valve 2 includes at least two sealing portions arranged along the overflow direction S, which is more reliable than only one sealing portion.

[0065] The above is only a preferred embodiment of the utility model, and does not limit the utility model in any form. Although the utility model has been disclosed as above, it is not intended to limit the utility model. Any skilled person in the art can make some changes or modifications to the disclosed technical content without departing from the technical solution range of the utility model, and equivalent embodiments with equivalent changes are equivalent. Any simple modification, equivalent change and modification of the above embodiments according to the technical essence of the utility model are still within the protection scope of the technical solution of the utility model.

Claims

1. A thermal runaway mitigation member for cooling a battery, comprising: The application relates to a valve (2) installed on a body (1) containing cooling liquid, the valve (2) having an overflow direction (S) for the cooling liquid to flow out of the body (1) through the valve (2), the valve (2) comprising at least two sealing portions arranged along the overflow direction (S), each of the sealing portions being closed when the battery is at a normal working temperature, each of the sealing portions being opened when the battery reaches a set temperature, the cooling liquid in the body (1) being able to flow out through the valve (2) to cool the battery.

2. The thermal runaway propagation inhibition according to claim 1, wherein The set temperature is a battery thermal runaway temperature.

3. The thermal runaway propagation inhibition according to claim 1, wherein The body (1) is a liquid cooling plate, the liquid cooling plate being provided with a flow channel (11) containing the cooling liquid, and the valve (2) being in communication with the flow channel (11).

4. The thermal runaway propagation inhibition according to any one of claims 1-3, wherein, The sealing portion of the valve (2) comprises at least a first sealing portion (21) and a second sealing portion (22), the valve (2) having a passage (23) for the cooling liquid to flow out, and the first sealing portion (21) and the second sealing portion (22) being arranged on the passage (23).

5. The thermal runaway propagation inhibition according to claim 4, wherein, The first sealing portion (21) comprises a hot-melt layer, the hot-melt layer being melted at the set temperature.

6. The thermal runaway propagation inhibition according to claim 4, wherein The second sealing portion (22) comprises a deformation component (222), the deformation component (222) being deformed to open the second sealing portion (22) at the set temperature.

7. The thermal runaway propagation inhibition according to claim 6, wherein The second sealing portion (22) further comprises a second baffle (221B) for blocking the passage (23), the second baffle (221B) being provided with a through hole (221E); The deformation component (222) comprises a deformation structure and a stop block (222G); When the battery is at a normal working temperature, the stop block (222G) covers the through hole (221E) on the second baffle (221B); when the battery reaches a set temperature, the stop block (222G) is separated from the through hole (221E) of the second baffle (221B) under the action of the deformation structure, so that the cooling liquid can flow through the through hole (221E) on the second baffle (221B) along the overflow direction (S).

8. The thermal runaway propagation inhibition according to claim 7, wherein, The second sealing portion (22) further comprises a hollow member (221) blocked in the passage (23), the hollow member (221) being a hollow cavity structure having a first baffle (221A) upstream, a second baffle (221B) downstream and a ring wall (221D) around along the overflow direction (S), the first baffle (221A) and the ring wall (221D) downstream of the second baffle (221B) being provided with through holes (221E); the hollow member (221) further has a third baffle (221C), the third baffle (221C) and the first baffle (221A) being arranged on the two sides of the second baffle (221B), and the first baffle (221A), the second baffle (221B) and the third baffle (221C) being connected with the ring wall (221D). The deformation structure comprises an elastic deformation piece (222F) and a thermal expansion piece (222H); the elastic deformation piece (222F) and the stopper (222G) are located between the first baffle (221A) and the second baffle (221B), two ends of the elastic deformation piece (222F) respectively contact the stopper (222G) and the first baffle (221A), and the stopper (222G) covers the through hole (221E) of the second baffle (221B) when the battery is at a normal working temperature; one end of the thermal expansion piece (222H) contacts the third baffle (221C), and the other end passes through the through hole (221E) of the second baffle (221B) and contacts the stopper (222G); The thermal expansion piece (222H) expands at the set temperature to drive the stopper (222G) to press the elastic deformation piece (222F), the elastic deformation piece (222F) is forced to shrink, the stopper (222G) is separated from the through hole (221E) of the second baffle (221B), so that the cooling liquid can flow through the first baffle (221A), the second baffle (221B) and the through hole (221E) on the ring wall (221D) in sequence and flow through the second sealing part (22).

9. The thermal runaway propagation inhibition according to claim 8, wherein, The through hole (221E) of the first baffle (221A) is spaced apart from the elastic deformation piece (222F); the inner wall of the through hole (221E) of the second baffle (221B) is spaced apart from the thermal expansion piece (222H); and the through hole (221E) of the ring wall (221D) is spaced apart from the thermal expansion piece (222H).

10. The thermal runaway propagation inhibition according to claim 8, wherein The thermal expansion piece (222H) comprises a thermal expansion material (222H1) and a receiving piece (222H2); the receiving piece (222H2) comprises an abutting column (222H21) and an abutting ring (222H22) connected to each other, one end of the abutting column (222H21) away from the abutting ring (222H22) contacts the stopper (222G), the abutting ring (222H22) abuts the inner wall of the ring wall (221D), and the receiving piece (222H2) receives the thermal expansion material (222H1) at least between the abutting ring (222H22) and the third baffle (221C); after the thermal expansion material (222H1) is heated and expanded, the receiving piece (222H2) is pressed in the direction of the stopper (222G), the receiving piece (222H2) presses the stopper (222G), and the stopper (222G) is separated from the through hole (221E) of the second baffle (221B).

11. The thermal runaway propagation inhibition according to claim 10, wherein The abutting column (222H21) is a hollow column structure with an opening at one end away from the stopper (222G), and the thermal expansion material (222H1) is also received in the hollow part of the abutting column (222H21).

12. The thermal runaway propagation inhibition according to claim 10, wherein, The through hole (221E) on the ring wall (221D) is located between the second baffle (221B) and the abutting ring (222H22).

13. The thermal runaway propagation inhibition according to claim 10, wherein, The first sealing portion (21) comprises a hot melt layer which melts at the set temperature; along the overflow direction (S), the second sealing portion (22) is located upstream of the first sealing portion (21).

14. A battery pack, characterized by A thermal runaway suppression member (100) as claimed in any of claims 1-13.

15. The battery pack of claim 14, wherein, The battery pack comprises a battery box, and the body (1) is a liquid cooling plate integrated on the battery box. The battery pack comprises a battery box, and the body (1) is a liquid cooling plate integrated on the battery box.

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