Liquid cooling plate, battery pack and electric device

Abstract

The utility model relates to a liquid cooling plate, a battery pack and an electric device. The liquid cooling plate is used for cooling the battery cell module, the battery cell module is provided with a pressure relief surface, a pressure relief valve of a battery cell of the battery cell module is located on the pressure relief surface, the liquid cooling plate is used for being arranged corresponding to the pressure relief surface, and the liquid cooling plate is provided with a first plate body, a second plate body and a cavity located between the first plate body and the second plate body and used for containing cooling liquid; the first plate body is closer to the pressure relief face relative to the second plate body, the first plate body is provided with a first weak structure corresponding to the pressure relief valve, the second plate body is provided with a second weak structure corresponding to the first weak structure, and the first weak structure can form a first notch communicated with the cavity when damaged. The second weak structure can form a second notch communicated with the cavity when damaged, and the second notch is communicated with the first notch through the cavity. The liquid cooling plate can effectively solve the problem of heat accumulation when the battery cell is in thermal runaway, and the purpose of preventing thermal diffusion is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of new energy, and in particular to a liquid cooling plate, a battery pack and an electric device. Background Art

[0002] With the development of power battery technology, developing a battery pack with fast charging, long life and high safety has become a consensus in the industry and the core competitiveness of major OEMs and battery manufacturers. However, the current heat diffusion problem and slow charging speed have become the pain points of the industry development, restricting the rapid popularization of new energy vehicles. The relevant technology uses a liquid cooling system to solve the heat diffusion problem and slow charging speed, but the liquid cooling system in the relevant technology cannot effectively solve the problem of heat accumulation during thermal runaway of the battery cell, and it is difficult to achieve the purpose of preventing heat diffusion. Utility Model Content

[0003] Based on this, it is necessary to provide a method that can effectively solve the problem of heat accumulation during thermal runaway of the battery cell to prevent heat diffusion.

[0004] The utility model provides a liquid cooling plate for cooling a battery module, wherein the battery module has a pressure relief surface, a pressure relief valve of a battery of the battery module is located on the pressure relief surface, the liquid cooling plate is used to be arranged corresponding to the pressure relief surface, and the liquid cooling plate has a first plate body and a second plate body that are relatively spaced apart, and a cavity located between the first plate body and the second plate body for containing a cooling liquid;

[0005] The first plate body is closer to the pressure relief surface than the second plate body. The first plate body has a first weak structure corresponding to the pressure relief valve. The second plate body has a second weak structure corresponding to the first weak structure. The first weak structure can form a first gap connected to the cavity when damaged. The second weak structure can form a second gap connected to the cavity when damaged. The second gap is connected to the first gap through the cavity.

[0006] In one embodiment, the liquid cooling plate also has a main partition connecting the first plate body and the second plate body, the main partition divides the cavity into a first cavity and a second cavity, the main partition corresponds to the middle part of the pressure relief valve of the battery cell of the battery cell module, at least part of the first cavity and at least part of the second cavity are respectively arranged corresponding to the pressure relief valve of the battery cell of the battery cell module, and the first weak structure and the second weak structure both extend from the first cavity to the second cavity.

[0007] In one embodiment, the liquid cooling plate further comprises a first partition and a second partition connecting the first plate body and the second plate body, the first partition is multiple and divides the first cavity into multiple first flow channels, the second partition is multiple and divides the second cavity into multiple second flow channels.

[0008] In one embodiment, the liquid cooling plate further includes an annular wall, which is disposed on a side of the first plate body away from the second plate body, and the first weak structure is located inside the annular wall, and the annular wall is used to cooperate with the pressure relief surface to form a smoke exhaust channel between the first weak structure and the pressure relief valve.

[0009] In one embodiment, the liquid cooling plate is made of plastic; and / or

[0010] The inner wall of the annular vertical wall is provided with a heat-resistant layer.

[0011] In one embodiment, the liquid cooling plate further includes an auxiliary vertical wall, which is disposed on a side of the first plate body away from the second plate body and located on the outside of the annular vertical wall, and the auxiliary vertical wall is used to cooperate with the pressure relief surface and the annular vertical wall to form an auxiliary flue located outside the smoke exhaust channel.

[0012] In one embodiment, the annular vertical wall has auxiliary vertical walls on both opposite sides; and / or

[0013] There are a plurality of auxiliary vertical walls, and the plurality of auxiliary vertical walls are arranged at intervals, and two of the auxiliary vertical walls corresponding to the poles of the battery cell located on the pressure relief surface constitute a vertical wall group, and the poles of the battery cell are located in the vertical wall group.

[0014] The utility model also provides a battery pack, comprising:

[0015] Box;

[0016] A battery cell module is disposed in the box, the battery cell module has a pressure relief surface, and a pressure relief valve of a battery cell of the battery cell module is located on the pressure relief surface; and

[0017] The liquid cooling plate is arranged on the pressure relief surface.

[0018] In one embodiment, the pole of the battery cell of the battery cell module is located on the pressure relief surface, a bus is provided at the pole of the battery cell of the battery cell module, and a heat conductive medium is provided between the bus and a side of the first plate body away from the second plate body; and / or

[0019] The pressure relief surface is located at the upper part of the battery cell module, and the battery pack also includes a lower liquid cooling plate arranged at the lower part of the battery cell module.

[0020] The utility model also provides an electrical device, comprising the above-mentioned battery pack.

[0021] In the above-mentioned liquid cooling plate, since the first plate body of the liquid cooling plate has a first weak structure corresponding to the pressure relief valve, and the second plate body has a second weak structure corresponding to the first weak structure, the first weak structure can form a first gap connected to the cavity when damaged, and the second weak structure can form a second gap connected to the cavity when damaged, and the second gap is connected to the first gap through the cavity. Therefore, when the battery cell is in thermal runaway, the first weak structure will be damaged first after being impacted by the high-temperature flue gas generated by the thermal runaway of the battery cell, forming the first gap connected to the cavity, and then the coolant in the cavity can flow out from the first gap, playing an active spray cooling role, preventing the instantaneous accumulation of heat and causing heat diffusion when the battery cell is in thermal runaway, and ensuring the functional safety of the battery pack. If there is no coolant in the cavity and the battery cell is still in thermal runaway, the second weak structure will be damaged after being impacted by the high-temperature flue gas generated by the thermal runaway of the battery cell, forming a second gap connected to the cavity. The second gap is connected to the first gap through the cavity, so that the high-temperature flue gas can be discharged from the thickness direction of the liquid cooling plate through the first gap and the second gap. Compared with discharge from the length direction of the liquid cooling plate, the high-temperature flue gas can be discharged more quickly, thereby preventing the high-temperature flue gas from spreading to adjacent battery cells and avoiding the occurrence of chain reactions. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the present application 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 present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0023] Figure 1 An exploded view of a battery pack in one embodiment of the utility model;

[0024] Figure 2 yes Figure 1 A schematic diagram of the structure of the battery cell module of the battery pack shown;

[0025] Figure 3 yes Figure 1 A partial cross-sectional view of the battery pack shown;

[0026] Figure 4 yes Figure 3 A schematic diagram of the structure of the liquid cooling plate shown;

[0027] Figure 5 yes Figure 4 A partial enlarged view of point A in the middle. DETAILED DESCRIPTION

[0028] In order to make the above-mentioned purposes, features and advantages of the utility model more obvious and easy to understand, the specific implementation methods of the utility model are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the utility model. However, the utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the utility model, so the utility model is not limited by the specific embodiments disclosed below.

[0029] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0030] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present utility model, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0031] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0032] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0033] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only implementation method.

[0034] like Figure 1 As shown, a battery pack 10 in a preferred embodiment of the present invention includes a box body 200, a battery cell module 300 and a liquid cooling plate 400.

[0035] The box body 200 includes a lower box body 210. The battery cell module 300 is disposed in the lower box body 210. In this embodiment, the box body 200 also includes an upper cover 220. The upper cover 220 is disposed at the upper portion of the lower box body 210 to cover the opening at the upper portion of the lower box body 210, thereby encapsulating the battery cell module 300 in the box body 200. In this embodiment, the lower box body 210 includes a frame body and a bottom plate disposed at the lower portion of the frame body, and the upper cover 220 is disposed at the upper portion of the frame body.

[0036] In this embodiment, if Figure 1 and Figure 2 As shown, the battery cell module 300 has a pressure relief surface 300a. The battery cell module 300 includes a battery cell row 310. The battery cell row 310 includes a plurality of battery cells 312 arranged along a first direction. The battery cell 312 has a pressure relief valve 312a. The pressure relief valves 312a of the plurality of battery cells 312 of the battery cell row 310 are all located on the pressure relief surface 300a and arranged along the first direction to form a pressure relief valve row. The liquid cooling plate 400 is disposed on the pressure relief surface 300a and extends along the first direction. That is, in this embodiment, the liquid cooling plate 400 is used for heat exchange with the pressure relief surface 300a.

[0037] In this embodiment, the pressure relief surface 300 a is located at the upper portion of the battery cell module 300 . It is understood that in other embodiments, the pressure relief surface 300 a may also be located at the side, bottom or middle portion of the battery cell module 300 .

[0038] In this embodiment, since the pressure relief surface 300a is located at the upper part of the battery cell module 300, and the liquid cooling plate 400 is arranged on the pressure relief surface 300a, the liquid cooling plate 400 is an upper liquid cooling plate. In this embodiment, the battery pack 10 also includes a lower liquid cooling plate 500, and the lower liquid cooling plate 500 is arranged at the lower part of the battery cell module 300. That is, in this embodiment, the battery pack 10 includes both the lower liquid cooling plate 500 and the upper liquid cooling plate, and has a double-layer liquid cooling structure, thereby having better heat exchange performance (relative to the battery pack 10 with only a lower liquid cooling plate or an upper liquid cooling plate).

[0039] In this embodiment, since the liquid cooling plate 400 is an upper liquid cooling plate, in other embodiments, the liquid cooling plate 400 may also have the function of the upper cover 220 covering the upper opening of the lower box body 210. In this case, the upper cover 220 may also be omitted.

[0040] In this embodiment, the battery cell 312 has a pole 312b. The pole 312b of the battery cell 312 of the battery cell module 300 is located on the pressure relief surface 300a. In this embodiment, the battery cell 312 has two poles 312b. Both poles 312b of the battery cell 312 are located on the pressure relief surface 300a, and the pressure relief valve 312a of the battery cell 312 is located between the two poles 312b of the battery cell 312.

[0041] In the present embodiment, a bus 314 is provided at the pole 312b of the battery cell 312 of the battery cell module 300. A heat-conducting medium is provided between the bus 314 and the liquid cooling plate 400. In this way, the liquid cooling plate 400 can actively cool the bus 314, and the heat-conducting medium can ensure that the liquid cooling plate 400 is in full contact with the bus 314, so that it is easier for the liquid cooling plate 400 to cool the bus 314, and can actively cool the bus 314 when the battery pack 10 is fast charged, thereby increasing the charging speed, achieving the purpose of fast charging of the battery pack 10, and achieving the purpose of increasing the service life of the battery pack 10. Moreover, the liquid cooling plate 400 can enhance the structural strength of the bus 314 to a certain extent. Specifically, in the present embodiment, the heat-conducting medium is a thermally conductive adhesive.

[0042] In the present embodiment, the battery cell rows 310 are multiple rows (greater than or equal to two rows). The multiple rows of battery cell rows 310 are arranged along the second direction, and the second direction is perpendicular to the first direction. The number of liquid cooling plates 400 is the same as the number of battery cell rows 310, and they are arranged one to one. In this way, it is easier to make the liquid cooling plate 400 and disassemble and assemble the liquid cooling plate 400. It can be understood that in other embodiments, when the battery cell rows 310 are multiple rows, the liquid cooling plate 400 can also be only one, and one liquid cooling plate 400 can cover all battery cell rows 310. It can be understood that in other embodiments, the battery cell rows 310 can also be one row.

[0043] In this embodiment, if Figure 3-Figure 5As shown, the liquid cooling plate 400 has a first plate body 410 and a second plate body 420 that are relatively spaced apart, and a cavity 430 for containing cooling liquid located between the first plate body 410 and the second plate body 420. The first plate body 410 is closer to the pressure relief surface 300a than the second plate body 420. The first plate body 410 has a first weak structure 412 that is arranged corresponding to the pressure relief valve 312a. The second plate body 420 has a second weak structure 422 that is arranged corresponding to the first weak structure 412. The first weak structure 412 can form a first gap that communicates with the cavity 430 when damaged. The second weak structure 422 can form a second gap that communicates with the cavity 430 when damaged. The second gap is connected to the first gap through the cavity 430.

[0044] In the above-mentioned liquid cooling plate 400, since the first plate body 410 of the liquid cooling plate 400 has a first weak structure 412 corresponding to the pressure relief valve 312a, and the second plate body 420 has a second weak structure 422 corresponding to the first weak structure 412, the first weak structure 412 can form a first gap connected to the cavity 430 when damaged, and the second weak structure 422 can form a second gap connected to the cavity 430 when damaged, and the second gap is connected to the first gap through the cavity 430. Therefore, when the battery cell 312 is in thermal runaway, the first weak structure 412 will be damaged first after being impacted by the high-temperature flue gas generated by the thermal runaway of the battery cell 312, forming the first gap connected to the cavity 430, and then the coolant in the cavity 430 can flow out from the first gap, playing an active spray cooling role, preventing the instantaneous accumulation of heat and causing heat diffusion when the battery cell 312 is in thermal runaway, and ensuring the functional safety of the battery pack 10. If there is no coolant in the cavity 430 and the battery cell 312 is still in thermal runaway, the second weak structure 422 will be damaged after being impacted by the high-temperature flue gas generated by the thermal runaway of the battery cell 312, forming a second gap connected to the cavity 430. The second gap is connected to the first gap through the cavity 430, so that the high-temperature flue gas can be discharged from the thickness direction of the liquid cooling plate 400 through the first gap and the second gap. Compared with discharging from the length direction of the liquid cooling plate 400, the high-temperature flue gas can be discharged more quickly, thereby preventing the high-temperature flue gas from spreading to the adjacent battery cells 312 and avoiding the occurrence of a chain reaction.

[0045] In this embodiment, the liquid cooling plate 400 also has a main partition 440 connecting the first plate body 410 and the second plate body 420. The main partition 440 divides the cavity 430 into a first cavity 430a and a second cavity 430b. The main partition 440 corresponds to the middle part of the pressure relief valve 312a of the battery cell 312 of the battery cell module 300, and at least part of the first cavity 430a and at least part of the second cavity 430b are respectively arranged corresponding to the pressure relief valve 312a of the battery cell 312 of the battery cell module 300. The first weak structure 412 and the second weak structure 422 both extend from the first cavity 430a to the second cavity 430b. In this way, when the first weak structure 412 is damaged, the coolant in the first cavity 430a and the second cavity 430b can both play a spray cooling role.

[0046] Specifically, in this embodiment, the liquid cooling plate 400 further comprises a first partition plate 440a and a second partition plate 440b connecting the first plate body 410 and the second plate body 420. There are a plurality of first partition plates 440a, and the first cavity 430a is divided into a plurality of first flow channels 432. There are a plurality of second partition plates 440b, and the second cavity 430b is divided into a plurality of second flow channels 434. Thus, when the first weak structure 412 is damaged, the coolant in a first flow channel 432 and a second flow channel 434 adjacent to the main partition plate 440 can both play a spraying and cooling role.

[0047] In this embodiment, the liquid cooling plate 400 also includes an annular wall 450. The annular wall 450 is disposed on the side of the first plate body 410 away from the second plate body 420, and the first weak structure 412 is located inside the annular wall 450. The annular wall 450 is used to cooperate with the pressure relief surface 300a to form a smoke exhaust channel 600 located between the first weak structure 412 and the pressure relief valve 312a. In this way, when the battery cell 312 is in thermal runaway, the annular wall 450 can guide the high-temperature flue gas so that the high-temperature flue gas can quickly damage the first weak structure 412 and the second weak structure 422, and can prevent the high-temperature flue gas from spreading everywhere. The smoke exhaust channel 600 can play a directional smoke exhaust function when the battery cell 312 is in thermal runaway, realize thermal and electrical separation, prevent insulation failure problems such as high-voltage arcing and short circuit when the battery cell 312 is in thermal runaway, and thus prevent heat diffusion from occurring, thereby ensuring the functional safety of the battery pack 10.

[0048] It should be noted that, in this embodiment, the liquid cooling plate 400 can be connected to the bus 314 by means of thermal conductive adhesive, so as to realize the connection between the liquid cooling plate 400 and the battery module 300, and then the annular wall 450 can be connected to or not connected to the battery module 300. Specifically, in this embodiment, the annular wall 450 is not connected to the battery module 300, but abuts against the battery module 300. It can be understood that in other embodiments, the annular wall 450 may not abut against the battery module 300, but contacts the battery module 300, and of course the annular wall 450 and the battery module 300 may also be connected by means of thermal conductive adhesive.

[0049] In this embodiment, the liquid cooling plate 400 further includes an auxiliary vertical wall 460. The auxiliary vertical wall 460 is disposed on a side of the first plate body 410 away from the second plate body 420 and is located outside the annular vertical wall 450. The auxiliary vertical wall 460 is used to cooperate with the pressure relief surface 300a and the annular vertical wall 450 to form an auxiliary flue 700 located outside the exhaust channel 600. In this way, when the high-temperature flue gas burns through the annular vertical wall 450, the high-temperature flue gas can enter the auxiliary flue 700 from the exhaust channel 600, thereby preventing the high-temperature flue gas from spreading further.

[0050] In this embodiment, the two opposite sides of the annular vertical wall 450 are provided with auxiliary vertical walls 460. In this way, both sides of the smoke exhaust channel 600 can be provided with auxiliary smoke ducts 700, so as to better prevent the high-temperature smoke from spreading further.

[0051] In this embodiment, there are multiple auxiliary vertical walls 460, and the multiple auxiliary vertical walls 460 are arranged at intervals. Two auxiliary vertical walls 460 corresponding to the poles 312b of the battery cell 312 located on the pressure relief surface 300a constitute a vertical wall group 460a. The poles 312b of the battery cell 312 are located in the vertical wall group 460a. In this way, one side of the annular vertical wall 450 has at least two auxiliary vertical walls 460, so that a secondary auxiliary flue or even more levels of auxiliary flue can be formed, which has a better effect of preventing the spread of high-temperature flue gas compared to one side of the annular vertical wall 450 having only one auxiliary vertical wall 460. Moreover, the poles 312b of the battery cell 312 are located in the vertical wall group 460a, so that during installation, the poles 312b of the battery cell 312 can be positioned by the vertical wall group 460a, which is more conducive to the rapid installation of the liquid cooling plate 400 on the battery cell module 300.

[0052] In this embodiment, the liquid cooling plate 400 is made of plastic. The plastic liquid cooling plate 400 can not only ensure insulation and pressure resistance safety and prevent high-voltage arcing, but also has good thermal conductivity and mechanical properties, and can also facilitate the damage of the first weak structure 412 and the second weak structure 422. It can be understood that in other embodiments, the material of the liquid cooling plate 400 can also be other insulating and thermally conductive materials.

[0053] In this embodiment, the inner wall of the annular wall 450 is provided with a heat-resistant layer. In this way, it is possible to prevent the high-temperature smoke from burning through the annular wall 450, resulting in the inability to exhaust smoke in a directional manner. It is understood that in other embodiments, when the material of the annular wall 450 is a high-temperature resistant metal, the heat-resistant layer can also be omitted. Specifically, in this embodiment, the heat-resistant layer can be a mica sheet or other heat-resistant material.

[0054] This embodiment also provides an electric device, which includes the battery pack, and the battery pack can provide electric energy for the electric device.

[0055] Among them, the above-mentioned electrical devices can be vehicles, mobile phones, portable devices, laptops, ships, spacecraft, electric toys, electric tools, energy storage equipment, amusement equipment, elevators and lifting equipment, etc. Vehicles can be fuel vehicles, gas vehicles or new energy vehicles, and new energy vehicles can be pure electric vehicles, hybrid vehicles or extended-range vehicles, etc.; spacecraft include airplanes, rockets, space shuttles and spacecrafts, etc.; electric toys include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys or electric airplane toys, etc.; electric tools include metal cutting electric tools, grinding electric tools, assembly electric tools and railway electric tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators and electric planers, etc.; energy storage equipment can be energy storage walls, base station energy storage, container energy storage, etc.; amusement equipment can be carousels, jumping machines, etc. This application does not impose special restrictions on the above-mentioned electrical devices.

[0056] Specifically, in this embodiment, the electrical device is a vehicle. That is, this embodiment also provides a vehicle. The vehicle includes a vehicle body and the above-mentioned battery pack. The vehicle body includes a vehicle floor. The vehicle floor has a notch. The lower box of the above-mentioned battery pack is arranged on the vehicle floor, and the liquid cooling plate is located in the notch to serve as a part of the vehicle floor. In this way, the space and weight in the height direction (Z direction) of the whole vehicle can be saved.

[0057] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described 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.

[0058] The above-mentioned embodiments only express several implementation methods of the utility model, and the description is relatively specific and detailed, but it cannot be understood as limiting the scope of the utility model patent. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the utility model, which all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent shall be based on the attached claims.

Claims

1. A liquid cooling plate for cooling a battery module, wherein the battery module has a pressure relief surface, and a pressure relief valve of a battery cell of the battery module is located on the pressure relief surface, characterized in that: The liquid cooling plate is used to be arranged corresponding to the pressure relief surface, and the liquid cooling plate comprises a first plate body and a second plate body which are relatively spaced apart, and a cavity located between the first plate body and the second plate body for containing cooling liquid; The first plate body is closer to the pressure relief surface than the second plate body. The first plate body has a first weak structure corresponding to the pressure relief valve. The second plate body has a second weak structure corresponding to the first weak structure. The first weak structure can form a first gap connected to the cavity when damaged. The second weak structure can form a second gap connected to the cavity when damaged. The second gap is connected to the first gap through the cavity.

2. The liquid cooling plate according to claim 1, characterized in that: The liquid cooling plate also has a main partition connecting the first plate body and the second plate body, the main partition divides the cavity into a first cavity and a second cavity, the main partition corresponds to the middle part of the pressure relief valve of the battery cell of the battery cell module, at least part of the first cavity and at least part of the second cavity are respectively arranged corresponding to the pressure relief valve of the battery cell of the battery cell module, and the first weak structure and the second weak structure both extend from the first cavity to the second cavity.

3. The liquid cooling plate according to claim 2, characterized in that: The liquid cooling plate also has a first partition and a second partition connecting the first plate body and the second plate body. The first partition is multiple and divides the first cavity into multiple first flow channels. The second partition is multiple and divides the second cavity into multiple second flow channels.

4. The liquid cooling plate according to claim 1, characterized in that: The liquid cooling plate also includes an annular wall, which is arranged on a side of the first plate body away from the second plate body, and the first weak structure is located inside the annular wall. The annular wall is used to cooperate with the pressure relief surface to form a smoke exhaust channel between the first weak structure and the pressure relief valve.

5. The liquid cooling plate according to claim 4, characterized in that: The liquid cooling plate is made of plastic; and / or The inner wall of the annular vertical wall is provided with a heat-resistant layer.

6. The liquid cooling plate according to claim 4, characterized in that: The liquid cooling plate also includes an auxiliary vertical wall, which is arranged on a side of the first plate body away from the second plate body and located on the outside of the annular vertical wall. The auxiliary vertical wall is used to cooperate with the pressure relief surface and the annular vertical wall to form an auxiliary flue located outside the smoke exhaust channel.

7. The liquid cooling plate according to claim 6, characterized in that: The auxiliary walls are provided on opposite sides of the annular wall; and / or There are a plurality of auxiliary vertical walls, and the plurality of auxiliary vertical walls are arranged at intervals, and two of the auxiliary vertical walls corresponding to the poles of the battery cell located on the pressure relief surface constitute a vertical wall group, and the poles of the battery cell are located in the vertical wall group.

8. A battery pack, characterized in that: include: Box; A battery cell module is disposed in the box, the battery cell module has a pressure relief surface, and a pressure relief valve of a battery cell of the battery cell module is located on the pressure relief surface; and The liquid cooling plate according to any one of claims 1 to 7 is arranged on the pressure relief surface.

9. The battery pack according to claim 8, characterized in that: The poles of the cells of the cell module are located on the pressure relief surface, a bus is provided at the poles of the cells of the cell module, and a heat conducting medium is provided between the bus and a side of the first plate away from the second plate; and / or The pressure relief surface is located at the upper part of the battery cell module, and the battery pack also includes a lower liquid cooling plate arranged at the lower part of the battery cell module.

10. An electrical device, characterized in that: Comprising a battery pack as claimed in claim 8 or 9.

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