CN117423932A

CN117423932A - Liquid cooling plate, battery pack and electricity utilization device

Info

Publication number: CN117423932A
Application number: CN202311468388.3A
Authority: CN
Inventors: 刘勇; 韩劼成; 张曦彤; 冯泽; 张纯纯
Original assignee: Lanjun New Energy Technology Co ltd
Current assignee: Lanjun New Energy Technology Co ltd
Priority date: 2023-11-06
Filing date: 2023-11-06
Publication date: 2024-01-19

Abstract

The invention 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 liquid cooling plate comprises a containing cavity for containing a cooling medium, the liquid cooling plate comprises a first end face which is used for being arranged towards a gas release valve of a battery cell of the battery cell module, a weak part is arranged on the first end face, and the weak part can form an opening communicated with the containing cavity when being damaged. The liquid cooling plate has the effects of extinguishing fire and extinguishing smoke.

Description

Liquid cooling plate, battery pack and electricity utilization device

Technical Field

The invention relates to the technical field of new energy, in particular to a liquid cooling plate, a battery pack and an electric device.

Background

The battery pack is generally provided with a liquid cooling plate, and the liquid cooling plate is utilized to exchange heat with the battery cell module in the battery pack, so that the temperature of the battery cell module is regulated. However, in the related art, when the electric core of the electric core module is out of control, the liquid cooling plate is difficult to achieve the effect of extinguishing fire and smoke.

Disclosure of Invention

Accordingly, it is necessary to provide a liquid cooling plate having a fire extinguishing effect against the above-mentioned problems.

The invention provides a liquid cooling plate for cooling an electric core module, which comprises a containing cavity for containing a cooling medium, and is characterized in that: the liquid cooling plate comprises a first end face which is used for being arranged towards the air release valve of the battery cell module, a weak part is arranged on the first end face, and the weak part can form an opening communicated with the accommodating cavity when being damaged.

In one embodiment, a blocking piece surrounding or semi-surrounding the weak portion is arranged on the first end face of the liquid cooling plate, the blocking piece extends towards the air release valve, the blocking piece comprises an end portion used for abutting against the air release surface where the air release valve of the battery cell module is located, and the abutting surface of the end portion and the air release surface can surround or semi-surround the air release valve.

In one embodiment, the blocking member includes a first baffle and a second baffle disposed along an extending direction of the liquid cooling plate, and the first baffle and the second baffle are disposed on both sides of the weak portion.

In one embodiment, the spacing between the first and second baffles remains the same or gradually increases in a direction toward the air release valve.

In one embodiment, the opposite end surfaces of the first baffle plate and the second baffle plate are stuck with heat insulation materials; and/or

The liquid cooling plate comprises a plurality of weak portions which are arranged at intervals along the extending direction of the liquid cooling plate, the weak portions are located between the first baffle plate and the second baffle plate, and the weak portions are arranged facing the air release valve.

In one embodiment, the liquid cooling plate includes a dome portion that is dome in a direction away from the air release valve, and an end surface of the dome portion facing the air release valve is the first end surface.

In one embodiment, the first end surface of the liquid cooling plate comprises an enhancement region with a melting point higher than the battery cell firing temperature, and the weak part is arranged on the enhancement region.

In one embodiment, the weak portion includes a notch provided on the reinforcing region, the notch communicating with the accommodating chamber, and the weak portion further includes a sealant plugged in the notch, the sealant having a melting point lower than a cell firing temperature.

In one embodiment, the liquid cooling plate further comprises an arch part, the arch part is made of a material with a melting point higher than the electric core spraying temperature, the arch part comprises an arch surface attached to the first end surface, an opening avoiding the weak part is formed in the arch surface, and side walls on two sides of the arch part form the blocking pieces located on two sides of the weak part.

In one embodiment, the arch is an arch-shaped metal plate.

In one embodiment, the liquid cooling plate is made of plastic and the barrier is made of plastic or metal.

The present invention also provides a battery pack including:

a case;

the battery cell module is arranged in the box body and is provided with a release surface, and a release valve of a battery cell of the battery cell module is positioned on the release surface; and

the liquid cooling plate is arranged on the air leakage surface.

The invention also provides an electric device comprising the battery pack.

Above-mentioned liquid cooling board sets up the weak portion on being used for facing towards the first terminal surface of the air release valve of electric core module to when electric core thermal runaway, the weak portion can be damaged after receiving the impact of the high temperature flue gas that electric core thermal runaway produced, forms the opening that the intercommunication held the chamber, and then the cooling medium in the holding chamber of liquid cooling board can spout out from the opening, plays the efficiency of putting out a fire and extinguishing cigarette, eliminates electric core thermal runaway danger.

Drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

Fig. 1 is an exploded view of a battery pack according to an embodiment of the present invention;

fig. 2 is an exploded view of a part of the structure of the battery pack shown in fig. 1;

FIG. 3 is a schematic structural view of a portion of the cell module of the battery pack shown in FIG. 1;

FIG. 4 is a partial cross-sectional view of the battery pack shown in FIG. 1;

FIG. 5 is an enlarged view of a portion of FIG. 4 at A;

fig. 6 is a schematic view of the battery pack shown in fig. 1 with the upper cover removed;

FIG. 7 is a schematic view of the liquid cooling plate of the battery pack shown in FIG. 1;

fig. 8 is a partial enlarged view at B in fig. 7;

FIG. 9 is a cross-sectional view of a liquid cooling plate according to an embodiment of the present invention;

FIG. 10 is a cross-sectional view of a liquid cooling plate according to another embodiment of the present invention;

FIG. 11 is a cross-sectional view of a liquid cooling plate according to another embodiment of the present invention;

FIG. 12 is a cross-sectional view of a liquid cooling plate according to another embodiment of the present invention;

FIG. 13 is a schematic view of the structure of the separator of the liquid cooling plate in FIG. 12;

fig. 14 is a partial enlarged view at C in fig. 13;

FIG. 15 is a cross-sectional view of a liquid cooling plate according to another embodiment of the present invention.

Detailed Description

In order that the above objects, features and advantages of the invention will be readily understood, a more particular description of the invention will be rendered by reference to the appended drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. The present invention may be embodied in many other forms than described herein and similarly modified by those skilled in the art without departing from the spirit of the invention, whereby the invention is not limited to the specific embodiments disclosed below.

In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present invention.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present invention, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.

In the present invention, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.

In the present invention, unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be the first and second features in direct contact, or the first and second features in indirect contact via an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.

It will be understood that when an element is referred to as being "fixed" or "disposed" on another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like are used herein for illustrative purposes only and are not meant to be the only embodiment.

As shown in fig. 1-3, a battery pack 10 in accordance with a preferred embodiment of the present invention. The battery pack 10 includes a case 200, a cell module 300, and a liquid cooling plate 400.

The case 200 includes a lower case 210. The battery module 300 is disposed in the lower case 210. In this embodiment, the case 200 further includes an upper cover 220. The upper cover 220 is provided on the upper portion of the lower case 210 to cover the opening of the upper portion of the lower case 210, thereby encapsulating the cell module 300 in the case 200. In the present embodiment, the lower case 210 includes a frame and a bottom plate provided at a lower portion of the frame, and the upper cover 220 is provided at an upper portion of the frame.

In this embodiment, the cell module 300 has a gas release surface 302. The cell module 300 includes a cell 312. The cell 312 has a release valve 312a. The bleed valve 312a is located on the bleed face 302. The liquid cooling plate 400 is provided on the air release surface 302. That is, in the present embodiment, the liquid cooling plate 400 is used for heat exchange with the air release surface 302.

In this embodiment, the venting surface 302 is located at the upper portion of the cell module 300. It will be appreciated that in other embodiments, the venting surface 302 can be located on the side, bottom, or middle of the cell module 300.

In this embodiment, since the air release surface 302 is located at the upper portion of the battery module 300, and the liquid cooling plate 400 is disposed on the air release surface 302, the liquid cooling plate 400 is an upper liquid cooling plate. In this embodiment, the battery pack 10 further includes a lower liquid cooling plate, and the lower liquid cooling plate is disposed at the lower portion of the battery cell module 300. That is, in this embodiment, the battery pack 10 includes both the lower liquid cooling plate 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 in which only the lower liquid cooling plate or the upper liquid cooling plate is provided).

In the present embodiment, since the liquid cooling plate 400 is an upper liquid cooling plate, in other embodiments, the liquid cooling plate 400 may have a function of covering the upper opening of the lower case 210 with the upper cover 220, and in this case, the upper cover 220 may be omitted.

In the present embodiment, the battery module 300 includes a battery cell row 310. The cell row 310 includes a plurality of cells 312 arranged in a first direction. The air release valves 312a of the plurality of cells 312 of the cell array 310 are all arranged along the first direction toward the air release surface 302, forming an air release valve array 310a. In this embodiment, the cell rows 310 are multiple rows (two rows or more). The plurality of rows of the battery cells 310 are arranged along a second direction, which is perpendicular to the first direction. The number of liquid cooling plates 400 is the same as the number of cell rows 310, and is one-to-one arranged. Thus, the liquid cooling plate 400 and the detachable liquid cooling plate 400 can be manufactured more conveniently. It will be appreciated that in other embodiments, when the cell rows 310 are arranged in multiple rows, only one liquid cooling plate 400 may be provided, and one liquid cooling plate 400 may cover all the cell rows 310. It will be appreciated that in other embodiments, the cell rows 310 may be a single row.

In the present embodiment, as shown in fig. 4 to 9, the liquid cooling plate 400 includes a housing chamber 410 for housing a cooling medium. The liquid cooled plate 400 includes a first end surface 410a for disposition facing the gas release valve 312a of the cell module 300. The first end surface 410a is provided with a weakened portion 420. The weak portion 420 can form an opening communicating with the accommodating chamber 410 when broken.

The above-mentioned liquid cooling plate 400 is provided with the weak portion 420 on the first end face 410a of the air release valve 312a facing the electric core module 300, so that when the electric core 312 is in thermal runaway, the weak portion 420 will be damaged after being impacted by the high temperature smoke generated by the electric core 312 in thermal runaway, an opening communicating with the accommodating cavity 410 is formed, and then the cooling medium in the accommodating cavity 410 of the liquid cooling plate 400 can be sprayed out from the opening, thereby having the effects of extinguishing fire and extinguishing smoke, and eliminating the risk of thermal runaway of the electric core 312.

In this embodiment, as shown in fig. 4 to 9, a blocking member 500 is provided on the first end surface 410a of the liquid cooling plate 400 to surround or semi-surround the weak portion 420. The barrier 500 extends toward the air release valve 312a. The stop 500 includes an end 500a for abutting the release surface 302 of the cell module 300 where the release valve 312a is located. The abutment surface of the end 500a with the relief surface 302 can be disposed around or semi-around the relief valve 312a. In this way, a diversion passage can be formed between the weak portion 420 and the air release valve 312a, so that the movement direction of the high-temperature flue gas and the cooling medium can be better restrained, the weak portion 420 can be quickly broken through by the high-temperature flue gas, and the cooling medium can quickly and accurately reach the position where the air release valve 312a is located. At the same time, the high-temperature smoke can be prevented from spreading to the adjacent battery cells 312, and the occurrence of chain reaction is avoided.

In the present embodiment, the barrier 500 includes a first baffle 510 and a second baffle 520 disposed along the extending direction of the liquid cooling plate 400. The first barrier 510 and the second barrier 520 are provided separately on both sides of the weak portion 420. As such, the first end face 410a, the venting face 302, the first baffle 510, and the second baffle 520 may enclose the smoke evacuation channel 600. Specifically, in the present embodiment, the first barrier 510 and the second barrier 520 are located on both sides of the air release valve row 310a and extend in the first direction. The smoke evacuation path 600 extends in a first direction.

Thus, when the battery cell 312 is thermally out of control and the weak portion 420 is not damaged, the high-temperature flue gas can enter the smoke exhaust channel 600 through the air release valve 312a, and the smoke exhaust channel 600 can isolate the high-temperature flue gas of the battery cell 312 from being thermally out of control, so that the high-temperature flue gas is prevented from flowing into the box 200 from the periphery to be diffused everywhere, and more serious consequences are caused. That is, the liquid cooling plate 400 is integrated with a liquid cooling function and a smoke exhausting function. The above-mentioned liquid cooling board 400 integrates liquid cooling function and smoke exhausting function to need not additionally set up smoke discharging channel 600, can reduce the spare part of battery package 10, and the reduction of spare part can solve the loaded down with trivial details problem of assembly process of battery package 10, still can solve because of spare part is many and occupy the battery package 10 inner space is many, leads to whole package low in utilization ratio's problem.

When the electric core 312 is out of control and the weak part 420 is damaged, the cooling medium can enter the smoke exhaust channel 600 from the weak part 420, the smoke exhaust channel 600 can conduct drainage to the cooling medium and the eruption, and in the drainage process, the cooling medium and the eruption are kept in contact with the liquid cooling plate 400 at any time, and can play a role in cooling while conducting drainage.

In other embodiments, the barrier 500 may also be a circumferential wall disposed about the frangible portion 420, and the abutment surface between the circumferential wall and the release surface 302 may likewise be disposed about the release valve 312a, thereby forming a flow-directing channel that encloses the frangible portion 420 and the release valve 312a therein. In the case of thermal runaway, the battery cell spray is sprayed from the air release valve 312a and breaks the weak portion 420 to enter the liquid cooling plate 400, and at this time, the liquid cooling plate 400 serves as the smoke exhaust passage 600, and the cooling medium in the liquid cooling plate 400 can also exchange heat with the battery cell spray to cool the battery cell spray. The thermal runaway inhibition capability is improved while the volume occupation is further reduced.

In other embodiments, the blocking member 500 may be a structural member independently disposed between the liquid cooling plate 400 and the cell 312, or the blocking member 500 may be a structural member integrally disposed on the cell 312.

In this embodiment, as shown in fig. 1, 2 and 5, the number of liquid cooling plates 400 is the same as the number of the cell rows 310, and is one-to-one arranged. Thus, in this embodiment, the barrier 500 includes only one first barrier 510 and one second barrier 520. It will be appreciated that in other embodiments, when the cell rows 310 are multiple, the liquid cooling plates 400 may be only one, one liquid cooling plate 400 can cover all the cell rows 310, and the blocking member 500 may include a plurality of first baffles 510 and a plurality of second baffles 520.

In the present embodiment, as shown in fig. 6, the end of the case 200 in the first direction has an explosion-proof valve 230. The smoke discharge passage 600 communicates with the explosion proof valve 230. So that when the core 312 is thermally out of control, the high temperature smoke enters the smoke discharging passage 600 through the air escape valve 312a and then can be discharged to the case 200 through the explosion proof valve 230.

In the present embodiment, as shown in fig. 1, 7 and 8, the liquid cooling plate 400 includes a cold plate body 402, a first header 404 and a second header 406. The first header 404 and the second header 406 are respectively disposed at two ends of the cold plate body 402 in the first direction. In this way, the liquid cooling plate 400 is constructed so as to be very convenient for the circulation of the cooling medium. Specifically, in the present embodiment, the cold plate body 402 is manufactured by an extrusion process using a plastic material, and the first manifold 404 and the second manifold 406 are manufactured by an injection molding integrated process. The first header 404 and the second header 406 are respectively disposed at two ends of the cold plate body 402 in the first direction by means of laser welding.

In some embodiments, as shown in fig. 9, the spacing between the first baffle 510 and the second baffle 520 remains constant in the direction from the first end face 410a to the relief face 302, i.e., in a direction toward the relief valve 312a. In this manner, the first baffle 510 and the second baffle 520 are conveniently disposed on the first end face 410a. Specifically, in the present embodiment, the first baffle 510 and the second baffle 520 are each disposed perpendicularly to the first end face 410a. In this way, in the case where the height of the smoke discharging passage 600 is determined, the first barrier 510 and the second barrier 520 can be made to have a small vertical size, saving material costs. It will be appreciated that in other embodiments, the first baffle 510 and the second baffle 520 may each be disposed obliquely to the first end surface 410a, and the distance between the first baffle 510 and the second baffle 520 may remain unchanged in the direction from the first end surface 410a to the air release surface 302.

In some embodiments, as shown in fig. 10, the spacing between the first baffle 510 and the second baffle 520 gradually increases in the direction from the first end face 410a to the relief face 302, i.e., in a direction toward the relief valve 312a. In this manner, not only is it convenient to provide the barrier 500 on the first end face 410a, but the first baffle 510 and the second baffle 520 may also direct the flow of high temperature flue gas. Specifically, in the present embodiment, the first baffle 510 and the second baffle 520 are both disposed obliquely to the first end surface 410a, and the distance between the first baffle 510 and the second baffle 520 gradually increases in the direction from the first end surface 410a to the air release surface 302, that is, the first baffle 510 and the second baffle 520 form an included angle, similar to a flare structure. In this way, the impact force of the high-temperature flue gas on the first baffle 510 and the second baffle 520 can be the same. It will be appreciated that in other embodiments, one of the first baffle 510 and the second baffle 520 is disposed perpendicular to the first end surface 410a, the other is disposed obliquely to the first end surface 410a, and the spacing between the first baffle 510 and the second baffle 520 increases gradually in the direction from the first end surface 410a to the air release surface 302.

In some embodiments, as shown in fig. 11, the liquid cooling plate 400 has a dome 410b. The arch 410b arches away from the air release valve 312a. The end of the arch 410b facing the air release valve 312a is a first end 410a. Thus, the smoke exhaust space of the smoke exhaust passage 600 can be increased, which is more beneficial to rapid smoke exhaust.

In this embodiment, the first end surface 410a of the liquid cooling plate 400 includes an enhanced region with a melting point higher than the cell firing temperature (the temperature of high-temperature flue gas). The weakened portion 420 is provided on the reinforced area. In this way, the liquid cooling plate 400 can be prevented from being melted by the high-temperature flue gas as a whole.

In this embodiment, the frangible portion 420 includes a notch provided in the reinforced area. The cutout communicates with the receiving chamber 410. The frangible portion 420 also includes a sealant that seals in the incision. The sealant has a melting point below the firing temperature of the cell. In this manner, the provision of the weakened portion 420 in the reinforced area is facilitated. When thermal runaway occurs in the battery cell 312, the sealant position is firstly disabled, and then the cooling medium in the accommodating cavity 410 can be sprayed out through the notch, and smoke and fire extinguishing can be achieved through spraying of the cooling medium.

In this embodiment, as shown in fig. 12 to 14, the liquid cooling plate 400 further includes an arch portion 500b. The arch portion 500b is made of a material having a melting point higher than the battery cell firing temperature. The arched portion 500b includes an arched surface 530 that conforms to the first end surface 410a. The arching surface 530 is provided with an opening 540 that is positioned to avoid the frangible portion 420. The side walls of the arched portion 500b constitute stoppers 500 (first barrier 510 and second barrier 520) located at both sides of the weak portion 420.

In this embodiment, the arch 500b is made of metal, and the arch 500b integrates the function of reinforcing the first end surface 410a and the function of forming the blocking member 500. Is favorable for integral assembly and reduces the production cost. In the present embodiment, a plurality of weak portions 420 are provided at intervals along the extending direction (first direction) of the liquid cooling plate 400. The plurality of weaknesses 420 are each located between the first barrier 510 and the second barrier 520. The weaknesses 420 are each disposed opposite the air release valve 312a. Specifically, in the present embodiment, one weak portion 420 is provided corresponding to one opening 540. Specifically, in the present embodiment, one weak portion 420 is provided corresponding to one air release valve 312a. It will be appreciated that in other embodiments, one frangible portion 420 may be provided corresponding to 2-5 of the air relief valves 312a.

In this embodiment, heat insulating materials are attached to opposite end surfaces of the first barrier 510 and the second barrier 520. The insulating material may protect the first barrier 510 and the second barrier 520 from the impact of high temperature flue gas. Specifically, in the present embodiment, the heat insulating material is mica paper, and the mica paper is adhered to opposite end surfaces of the first barrier 510 and the second barrier 520.

In this embodiment, the material of the liquid cooling plate 400 is plastic. In this way, after the liquid cooling plate 400 is impacted by the high-temperature smoke out of control by the battery cell 312, the liquid cooling plate is broken, so that the cooling medium in the liquid cooling plate 400 is sprayed out to play a role in extinguishing fire and extinguishing smoke, and the thermal runaway danger of the battery cell 312 is eliminated. At this time, it is considered that the areas of the first end surface 410a of the liquid cooling plate 400 facing the air release valve 312a are all weakened portions 420. The number of weaknesses 420 is the same as the number of air release valves 312a and is one-to-one arranged.

In some embodiments, the first baffle 510 and the second baffle 520 are plastic. The opposite end surfaces of the first barrier 510 and the second barrier 520 are attached with a heat insulating material.

In some embodiments, the first baffle 510 and the second baffle 520 are metal. In this way, the first barrier 510 and the second barrier 520 are not damaged by the impact of high temperature flue gas even if the heat insulating material is not provided. Specifically, in the present embodiment, as shown in fig. 15, the first baffle 510 and the second baffle 520 are made of metal. The ends of the first baffle 510 and the second baffle 520 that are remote from the air release surface 302 are located within the liquid cooling plate 400. Thus, the first baffle 510 and the second baffle 520 can be more firmly fixed to the liquid cooling plate 400.

In some embodiments, as shown in fig. 12-14, the liquid cooling plate 400 further includes an arch 500b. The arched portion 500b includes an arched surface 530 that conforms to the first end surface 410a. In this way, the first baffle 510 and the second baffle 520 can be more firmly fixed to the liquid cooling plate 400 by the arched surface 530, especially when the arched portion 500b is made of metal.

Specifically, in the present embodiment, the arched portion 500b is made of metal, and the liquid cooling plate 400 is made of plastic. The arched portion 500b is provided on the first end surface 410a of the liquid cooling plate 400 by means of hot melt welding. It is understood that in other embodiments, the arch portion 500b may be provided on the first end surface 410a of the liquid cooling plate 400 by glue bonding.

In other embodiments, the liquid cooling plate 400 may be formed by splicing different materials. Specifically, the liquid cooling plate 400 may include a metal part and two plastic parts. The two plastic parts are respectively arranged at two sides of the metal part. The metal part and both plastic parts have a receiving cavity 410. The weakened portion 420 is located on the metal portion. The barrier 500 is provided on the metal part.

It will be appreciated that in other embodiments, the liquid cooling plate 400 may also include a plastic portion and two metal portions. The two metal parts are respectively arranged at two sides of the plastic part. The plastic part and both metal parts have a receiving cavity 410. The weakened portion 420 is located on the plastic portion. The barrier 500 is provided on the plastic part.

In this embodiment, as shown in fig. 1-5, the post 312b of the cell 312 is located on the venting surface 302. A tab 320 electrically connected to the pole 312b is provided at the pole 312 b. A heat conductive structural adhesive 700 is disposed between the liquid cooling plate 400 and the tabs 320. That is, in this embodiment, the liquid cooling plate 400 and the tab 320 are bonded and fixed by the heat conductive structural adhesive 700. In this way, the liquid cooling plate 400 and the air leakage surface 302 of the battery cell module 300 are not only convenient to firmly fix, but also when the battery cell 312 works (charges and discharges), and when thermal runaway does not occur, the liquid cooling plate 400 can exchange heat with the bar sheet 320 at a high speed through the heat conduction structural adhesive 700, so that the battery cell 312 can be well cooled, and the temperature of the battery cell 312 is optimized.

Specifically, in the present embodiment, the battery cell 312 has two poles 312b, and the air release valve 312a is located between the two poles 312 b.

In this embodiment, the cell module 300 further includes a CCS assembly 330 disposed on the gas release surface 302. The CCS assembly 330 is mainly used to integrate the tabs 320, and the tabs 320 of the cell module 300 are integrated onto the CCS assembly 330 and then mounted onto the cell rows 310 of the cell module 300. The tabs 320 are provided on the CCS assembly 330. The liquid cooling plate 400 and the tabs 320 are adhered and fixed by the heat conductive structural adhesive 700, and the first end surface 410a of the liquid cooling plate 400, the CCS assembly 330, the first baffle 510 and the second baffle 520 enclose to form a smoke exhaust channel 600 extending along the first direction. CCS assembly 330 has relief holes 330a. Each relief hole 330a is disposed corresponding to one of the air release valves 312a. In this manner, when the battery cell 312 is thermally out of control, high temperature flue gas may enter the smoke evacuation channel 600 from the air release valve 312a through the escape hole 330a.

The embodiment also provides an electric device. The power utilization device comprises the battery pack, and the battery pack can provide electric energy for the power utilization device.

The electric device can be a vehicle, a mobile phone, portable equipment, a notebook computer, a ship, a spacecraft, an electric toy, an electric tool, energy storage equipment, recreation equipment, an elevator, lifting equipment and the like. The vehicle can be a fuel oil vehicle, a fuel gas vehicle or a new energy vehicle, and the new energy vehicle can be a pure electric vehicle, a hybrid electric vehicle or a range-extended vehicle; spacecraft including airplanes, rockets, space planes, spacecraft, and the like; the electric toy includes fixed or mobile electric toys, such as a game machine, an electric car toy, an electric ship toy, or an electric plane toy, etc.; power tools include metal cutting power tools, grinding power tools, assembly power tools, and railroad power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, electric planers, and the like; the energy storage device can be an energy storage wall, a base station energy storage, a container energy storage and the like; the amusement device may be a carousel, a stair jump machine, or the like. The present application does not particularly limit the above-described power consumption device.

For pure electric vehicles, the battery pack can be used as a driving power supply to replace fossil fuel to provide driving power.

The battery pack specifically includes a battery management system (Battery Management System, BMS) and a battery cell module. The cell module comprises a plurality of cells. The battery cells can be connected in series and/or in parallel and form a battery cell module with the module management system, and then the battery cell module is electrically connected in series, in parallel or in a mode of mixing the series and the parallel and forms a battery pack together with the battery management system. The battery cell may be a lithium ion battery, a sodium ion battery or a magnesium ion battery, but is not limited thereto.

The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.

The above examples illustrate only a few embodiments of the invention, which are described in detail and are not to be construed as limiting the scope of the invention. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention. Accordingly, the scope of protection of the present invention is to be determined by the appended claims.

Claims

1. A liquid cooling plate for cooling a cell module, the liquid cooling plate comprising a receiving chamber for receiving a cooling medium, characterized in that: the liquid cooling plate comprises a first end face which is used for being arranged towards the air release valve of the battery cell module, a weak part is arranged on the first end face, and the weak part can form an opening communicated with the accommodating cavity when being damaged.

2. The liquid cooling plate according to claim 1, wherein: the first end face of the liquid cooling plate is provided with a blocking piece which surrounds or semi-surrounds the weak portion, the blocking piece extends towards the air release valve, the blocking piece comprises an end portion which is used for propping against the air release surface where the air release valve of the battery cell module is located, and the end portion and the propping surface of the air release surface can surround or semi-surround the air release valve.

3. The liquid cooling plate according to claim 2, wherein: the blocking piece comprises a first baffle and a second baffle which are arranged along the extending direction of the liquid cooling plate, and the first baffle and the second baffle are respectively arranged on two sides of the weak portion.

4. The liquid cooling plate according to claim 3, wherein: the distance between the first baffle plate and the second baffle plate is kept unchanged or gradually increased along the direction approaching the air release valve.

5. The liquid cooling plate according to claim 3, wherein: the opposite end surfaces of the first baffle plate and the second baffle plate are stuck with heat insulation materials; and/or

6. The liquid cooling plate according to claim 3, wherein: the liquid cooling plate comprises an arched portion, the arched portion is arched in a direction away from the air release valve, and the end face of the arched portion, which faces the air release valve, is the first end face.

7. The liquid cooling plate according to claim 3, wherein: the first end face of the liquid cooling plate comprises an enhancement area with the melting point higher than the battery cell spraying temperature, and the weak part is arranged on the enhancement area.

8. The liquid cooling plate according to claim 7, wherein: the weak portion comprises a notch arranged on the enhancement area, the notch is communicated with the accommodating cavity, the weak portion further comprises sealant plugged in the notch, and the sealant has a melting point lower than the battery cell explosion temperature.

9. The liquid cooling plate according to claim 3, wherein: the liquid cooling plate further comprises an arch part, the arch part is made of a material with the melting point higher than the electric core spraying temperature, the arch part comprises an arch surface attached to the first end surface, an opening avoiding the arrangement of the weak part is formed in the arch surface, and side walls on two sides of the arch part form the blocking piece located on two sides of the weak part.

10. The liquid cooling plate according to claim 9, wherein: the arch part is an arch metal plate.

11. The liquid cooling plate according to claim 2, wherein: the liquid cooling plate is made of plastic, and the blocking piece is made of plastic or metal.

12. A battery pack, comprising:

a case;

the liquid cooling plate according to any one of claims 1 to 11, provided on the air release surface.

13. An electrical device comprising the battery pack of claim 12.