CN217881787U

CN217881787U - Battery protection assembly and battery device

Info

Publication number: CN217881787U
Application number: CN202221971371.0U
Authority: CN
Inventors: 吴扬; 肖宁强; 赵恒�; 文娟·刘·麦蒂斯; 吴生先
Original assignee: Microvast Power Systems Huzhou Co Ltd
Current assignee: Microvast Power Systems Huzhou Co Ltd
Priority date: 2022-07-28
Filing date: 2022-07-28
Publication date: 2022-11-22
Anticipated expiration: 2032-07-28

Abstract

The utility model provides a battery protection subassembly and battery device. A battery protection assembly comprising: the protection casing is made by high temperature resistant material, and the protection casing is injectd the protection chamber that is used for protecting the battery box and an opening that communicates with the protection chamber, and the opening is located the bottom of battery box, and the protection casing is configured to, and when battery protection subassembly installed on the automobile body, the opening set up towards ground, provides directional pressure release passageway for the battery pack in the battery box. The technical scheme of the utility model when having solved the battery device among the prior art and taking place thermal runaway, its inside high-temperature gas or flame easily to the problem of unordered injection all around.

Description

Battery protection assembly and battery device

Technical Field

The utility model relates to a power battery safety protection technical field particularly, relates to a battery protection subassembly and battery device.

Background

The new energy automobile is increasingly popular in the market with the advantages of zero emission, no pollution, low noise, good smoothness, low use cost and the like. A battery pack consisting of lithium ion batteries is a main energy storage component of a new energy automobile. With the increasing energy density of lithium ion batteries, the safety and reliability of lithium ion batteries are receiving more attention.

When the battery pack is collided or squeezed, the battery may be damaged to cause thermal runaway, and in severe cases, the battery pack may catch fire or even explode. In some cases, the structure of the battery pack is damaged, so that the battery pack is ignited and erupted irregularly around, and the safety of personnel is seriously threatened.

SUMMERY OF THE UTILITY MODEL

A primary object of the present invention is to provide a battery protection assembly and battery device to solve the problem that the battery device in the prior art is easily sprayed disorderly to the surrounding when thermal runaway occurs.

In order to achieve the above object, the present invention provides a battery protection assembly, including: the protection casing is made by high temperature resistant material, and the protection casing is injectd the protection chamber that is used for protecting the battery box and an opening that communicates with the protection chamber, and the opening is located the bottom of battery box, and the protection casing is configured to, and when battery protection subassembly installed on the automobile body, the opening set up towards ground, provides directional pressure release passageway for the battery pack in the battery box.

In some embodiments, the protective cover includes a first protective part and four second protective parts connected to the first protective part, the second protective parts are arranged at an angle with respect to the first protective part and are connected end to end along the circumferential direction of the battery box to form the protective cavity.

In some embodiments, the shield is made of a flexible material.

In some embodiments, the battery protection assembly further comprises a battery box for housing the battery assembly, and the protective cover is connected with the battery box.

In some embodiments, the battery protection assembly further includes an adhesive layer between the protective cover and the battery case to connect the protective cover and the battery case.

In some embodiments, the battery box comprises a box body and a cover plate arranged on the box body, the box body defines a containing cavity and a liquid inlet and a liquid outlet which are communicated with the containing cavity, and the containing cavity is used for containing the battery assembly and the cooling liquid.

In some embodiments, the box body comprises a bottom plate, a first flow passage arranged on the bottom plate, and a plurality of outlets communicated with the first flow passage, the outlets are communicated with the accommodating cavity, and the first flow passage is communicated with the liquid inlet.

In some embodiments, the box includes a plurality of first flow passages spaced apart along a first direction, and the plurality of outlets are arranged in rows and columns.

In some embodiments, along the second direction, the box further includes two first side plates located on two sides of the bottom plate, at least one of the first side plates is provided with a second flow channel, one end of the second flow channel is communicated with the first flow channel, the other end of the second flow channel is communicated with the liquid inlet, and the second direction and the first direction form an included angle.

In some embodiments, each of the two first side plates has a second flow channel, and the box further includes: the two second side plates are arranged on two sides of the bottom plate at intervals along the first direction, and the liquid inlet is arranged on one of the two second side plates; the first main pipe is positioned in the accommodating cavity and communicated with the liquid inlet; and the two first branch pipes are positioned in the accommodating cavity, one ends of the two first branch pipes are respectively communicated with the two second flow channels, and the other ends of the two first branch pipes are communicated with the first main pipe.

In some embodiments, the cover plate is provided with a plurality of inlets communicated with the accommodating cavity and a third flow passage communicated with the inlets, and the third flow passage is communicated with the liquid outlet.

In some embodiments, a plurality of pressure relief valves are provided on a side of the battery box facing the opening.

In some embodiments, the battery box comprises a box body and a cover plate arranged on the box body, the box body is positioned in the protection cavity, and the cover plate is positioned at the opening so that the cover plate can be broken to release pressure when thermal runaway occurs.

According to another aspect of the present invention, the present invention provides a battery device, which includes a battery assembly and a battery protection assembly for protecting the battery assembly.

Use the technical scheme of the utility model, the protection casing cladding is in the periphery of battery box, only is equipped with an opening towards ground, and the battery box does not have the one side of protection casing to ground promptly, and the protection casing has high temperature resistant fire behavior, like this, after the battery box takes place the thermal runaway, high-temperature gas or flame in the battery box can only spray to ground along the opening to prevent high-temperature gas or flame from spraying to unordered all around, and then protection personnel's safety.

Drawings

The accompanying drawings, which form a part of the specification, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate exemplary embodiments of the invention and together with the description serve to explain the invention and do not constitute a limitation on the scope of the invention. In the drawings:

fig. 1 shows a schematic structural diagram of a battery device according to an embodiment of the present invention;

FIG. 2 shows an exploded schematic view of the battery device of FIG. 1;

fig. 3 shows a schematic structural view of a case of the battery device of fig. 1;

fig. 4 shows a cross-sectional view of the battery box of the battery device of fig. 1 in a first direction;

fig. 5 shows a cross-sectional view of the battery compartment of the battery device of fig. 1 in a second direction;

fig. 6 is a schematic structural view illustrating a cap plate of the battery device of fig. 1;

fig. 7 is a schematic structural view of a battery device according to another embodiment of the present invention;

fig. 8 is a schematic structural view of a battery device according to another embodiment of the present invention; and

fig. 9 shows an exploded structural view of the battery device of fig. 8.

Wherein the figures include the following reference numerals:

1. a protective cover; 2. a battery box; 3. a cover plate; 4. a battery pack; 5. a box body; 6. mounting holes; 7. an anti-collision structure; 8. a plug-in unit; 9. a liquid outlet; 10. a liquid inlet; 11. an outlet; 12. an interface; 13. a first branch pipe; 14. a first manifold; 15. a first flow passage; 16. a second flow passage; 17. a fourth flow path; 18. an inlet; 19. a third flow path; 20. a second branch pipe; 21. a second manifold; 22. a pressure relief valve; 31. a first guard; 32. a second guard.

Detailed Description

It should be noted that, in the present application, the embodiments and features of the embodiments may be combined with each other without conflict. The present invention will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.

As shown in fig. 1 and 2, an embodiment of the present invention provides a battery protection assembly. The battery protection assembly includes a protection cover 1 made of a high temperature resistant material. The protective cover 1 defines a protection cavity for protecting the battery box 2 and an opening communicating with the protection cavity, and the opening is located at the bottom of the battery box 2, and the protective cover 1 is configured such that when the battery protection assembly is mounted on a vehicle body, the opening is disposed toward the ground to provide a directional pressure relief passage for the battery assembly 4 in the battery box.

Among the above-mentioned technical scheme, the cladding of protection casing 1 is in the periphery of battery box 2, only is equipped with an opening towards ground, and the one side that does not have the protection casing of battery box 2 promptly is towards ground, and the protection casing has high temperature resistant fire behavior, and like this, after battery box 2 takes place the thermal runaway, high-temperature gas or flame in the battery box 2 can only be along the opening to ground injection to prevent high-temperature gas or flame from spraying to unordered all around, and then protection personnel's safety.

As shown in fig. 1 and fig. 2, in the embodiment of the present invention, the protection cover 1 includes a first protection member 31 and four second protection members 32 connected to the first protection member 31, the second protection members 32 are disposed at an angle with respect to the first protection member 31, and along the circumferential direction of the battery box 2, the four second protection members 32 are connected end to end in sequence to form a protection cavity.

With the above arrangement, the first protection member 31 can be covered on the battery box 2, and the four second protection members 32 can be covered on the front, rear, left, and right surfaces of the battery box 2, so that after thermal runaway of the battery box 2 occurs, the first protection member 31 and the four second protection members 32 can prevent high-temperature and high-pressure gas or flame from being injected around and above the battery box 2, thereby preventing the occurrence of car fire.

Specifically, in the embodiment of the present invention, the protection cover 1 is made of a flexible material. Like this, fix protection casing 1 at the surface of battery box 2, protection casing 1 that the flexible material was made can protect battery box 2, even battery box 2 causes the structure to break because of reasons such as collision, flexible protection casing 1 can not take place to destroy and still can cover on battery box 2 to prevent that the high temperature gas in battery box 2 from spouting everywhere and causing the conflagration.

The utility model discloses an in the embodiment, protection casing 1 is made by the fire prevention high temperature resistant flexible material, for example high temperature resistant aerogel or high temperature resistant silicon rubber, and this flexible material preferred has certain elastic material, and like this, after battery box 2 structure receives destruction, protection casing 1 also can not destroyed, and battery box 2 takes place to warp back protection casing 1 and is difficult for breaking, still covers at battery box 2 surfaces.

As shown in fig. 2, in the embodiment of the present invention, the battery protection assembly further includes a battery box 2 for placing the battery assembly 4, and the protection cover 1 is connected to the battery box 2. In this way, the protection cover 1 can be prevented from being displaced, so that the protection cover 1 is fixed to the outer periphery of the battery case 2 to protect the battery case 2.

Specifically, in the embodiment of the present invention, the battery protection assembly further includes an adhesive layer located between the protection cover 1 and the battery box 2 to connect the protection cover 1 and the battery box 2. This makes it possible to achieve a tight connection of the protective cover 1 to the battery box 2. In other embodiments, the connection of the protective cover 1 to the battery box 2 can be realized in other ways.

It is possible to bond a portion of the contact points between the protection cover 1 and the battery case 2 so that there is a certain gap between the protection cover 1 and the battery case 2 and if the side or upper surface of the battery case 2 is broken, the spouting material can be spouted downward by being guided through the unbonded gap.

Of course, in an alternative embodiment, the contact surface between the protection cover 1 and the battery case 2 may be entirely bonded to connect the protection cover 1 and the battery case 2.

The present embodiment uses an adhesive to connect the protection cover 1 and the battery box 2, but is not limited to the above.

As shown in fig. 2, in the embodiment of the present invention, the battery box 2 includes a box body 5 and a cover plate 3 disposed on the box body 5, the box body 5 defines a containing cavity and a liquid inlet 10 and a liquid outlet 9 both communicated with the containing cavity, and the containing cavity is used for accommodating the battery assembly 4 and the cooling liquid. The battery assembly 4 in this embodiment includes several cylindrical batteries, and in other embodiments, the battery assembly 4 may also include a pouch battery and/or a prismatic battery.

Through the above arrangement, when thermal runaway occurs in the battery box 2, the internal pressure of the battery box 2 can be released through the accommodating cavity of the battery box 2 and the liquid inlet 10 and the liquid outlet 9 communicated with the accommodating cavity, namely, the internal gas of the battery box 2 is discharged out of the battery box 2 through the liquid outlet 9 and the liquid inlet 10, so that the problem of explosion of the battery box 2 due to overlarge pressure is prevented.

In one embodiment of the present invention, the cover plate 3 is disposed on the upper portion of the box 5, i.e. the cover plate 3 is protected inside the protection cover 1.

It should be noted that, in the embodiment of the present invention, after the battery box 2 is installed, the cooling liquid is filled into the empty space in the accommodating cavity except for the battery assembly 4.

The utility model discloses an in the embodiment, box 5 is equipped with a plurality of mounting holes 6 towards open-ended one side to realize being connected of battery box 2 and automobile body.

The utility model discloses an in the embodiment, one side that is equipped with inlet 10 and liquid outlet 9 of box 5 is equipped with crashproof structure 7, like this, can avoid inlet 10 and liquid outlet 9 to receive the damage.

The utility model discloses an in the embodiment, battery box 2 is still including setting up plug connector 8 in 9 one sides of liquid outlet, like this, can realize giving battery charge-discharge.

As shown in fig. 3 and 4, in the embodiment of the present invention, the box body 5 includes a bottom plate, a first flow channel 15 disposed on the bottom plate, and a plurality of outlets 11 communicated with the first flow channel 15, and the outlets 11 are communicated with the accommodating cavity, and the first flow channel 15 is communicated with the liquid inlet 10.

Through the arrangement, on one hand, the cooling liquid is convenient to be conveyed into the accommodating cavity; on the other hand, when thermal runaway occurs in the battery box 2, the high-pressure gas in the accommodating cavity can enter the first flow channel 15 through the plurality of outlets 11 and is discharged out of the battery box 2 from the liquid inlet 10 through the first flow channel 15, so that the internal pressure of the battery box 2 is released.

In one embodiment of the present invention, the first flow channel 15 and the outlet 11 are located at the bottom of the box 5.

As shown in fig. 3 and 4, in the embodiment of the present invention, the box body 5 includes a plurality of first flow passages 15 spaced along the first direction, and the plurality of outlets 11 are arranged in rows and columns. Like this, the upper surface of every first runner 15 all has a plurality of exports 11 to be convenient for the coolant liquid to flow into the holding intracavity, the high-pressure gas in the holding intracavity of also being convenient for discharges.

As shown in fig. 4 and 5, in the embodiment of the present invention, along the second direction, the box 5 further includes two first side plates located at two sides of the bottom plate, at least one of the first side plates is provided with a second flow channel 16, one end of the second flow channel 16 is communicated with the first flow channel 15, the other end of the second flow channel 16 is communicated with the liquid inlet 10, and the second direction and the first direction are arranged at an included angle.

In the above technical solution, the first flow channel 15 and the liquid inlet 10 can be communicated through the second flow channel 16, so that the liquid inlet 10 can be arranged on the periphery of the box body 5, thereby facilitating the transportation of the cooling liquid into the accommodating cavity; further, when thermal runaway occurs in the battery box 2, high-pressure gas in the accommodating cavity can enter the first flow channel 15 through the plurality of outlets 11, and is discharged out of the battery box 2 from the liquid inlet 10 after passing through the first flow channel 15 and the second flow channel 16, so that the internal pressure of the battery box 2 is released.

As shown in fig. 4, in an embodiment of the present invention, the plurality of first flow channels 15 are all communicated with the second flow channel 16, so that the flow rate of the cooling liquid can be increased, and the release path of the high-pressure gas can also be increased.

As shown in fig. 3 and 5, in the embodiment of the present invention, the two first side plates are provided with the second flow channels 16, and the box 5 further includes two second side plates, a first header pipe 14 and two first branch pipes 13. The two second side plates are arranged on two sides of the bottom plate at intervals along a first direction, and the liquid inlet 10 is arranged on one of the two second side plates; the first manifold 14 is positioned in the accommodating cavity, and the first manifold 14 is communicated with the liquid inlet 10; two first branch pipes 13 are located the holding intracavity, and the one end of two first branch pipes 13 communicates with two second flow channels 16 respectively, and the other end of two first branch pipes 13 all communicates with first house steward 14, and just first branch pipe 13 is the contained angle setting with first house steward 14.

Through the arrangement, the cooling liquid can enter the first main pipe 14 through the liquid inlet 10, respectively flows into the two second flow channels 16 through the two first branch pipes 13, then flows into the plurality of first flow channels 15 and then flows out of the plurality of outlets 11 to the accommodating cavity, so that the cooling liquid in the accommodating cavity can exchange heat with the battery assembly 4 in the accommodating cavity, and the temperature of the battery assembly 4 is reduced; further, since the cooling liquid is in direct contact with the battery assembly 4, the pressure can be released by the cooling path when thermal runaway occurs, thereby preventing the battery case 2 from exploding due to excessive pressure.

As shown in fig. 4 and 5, in the embodiment of the present invention, the first side plate is further provided with two fourth runners 17 for communicating the second runner 16 with the first branch pipes 13, the two fourth runners 17 are disposed corresponding to the two first branch pipes 13, and the fourth runner 17 is located above the second runner 16. In this way, a fully communicating tank flow channel can be formed.

As shown in fig. 3, in the embodiment of the present invention, two connectors 12 corresponding to the two first branch pipes 13 are further disposed on the first side plate, and the connectors 12 are communicated with the fourth flow channel 17, so that the first branch pipes 13 and the fourth flow channel 17 can be communicated.

As shown in fig. 6, in the embodiment of the present invention, the cover plate 3 is provided with a plurality of inlets 18 communicated with the accommodating chamber and a third flow channel 19 communicated with the plurality of inlets 18, and the third flow channel 19 is communicated with the liquid outlet 9.

Through the arrangement, the cooling liquid in the accommodating cavity after heat exchange with the battery assembly 4 is completed can flow out from the liquid outlet 9 through the plurality of inlets 18 and the third flow channel 19 so as to complete the circulating flow of the cooling liquid, and therefore, the heat in the battery box 2 is taken out.

Specifically, in the embodiment of the present invention, one side of the cover plate 3 facing the accommodating cavity is provided with two second branch pipes 20 and a second header pipe 21 communicated with the second branch pipes 20, the second branch pipes 20 are communicated with the third flow channel 19, and the second header pipe 21 is communicated with the liquid outlet 9. Thus, a completely communicated cover plate flow passage can be formed, and a pressure relief channel can be added.

Specifically, as shown in fig. 2 to fig. 6, when the interior of the battery box 2 needs to be cooled, the cooling liquid flows circularly, the flowing direction is that the cooling liquid flows into the accommodating cavity from the outlet 11 after sequentially passing through the liquid inlet 10, the first main pipe 14, the first branch pipe 13, the interface 12, the fourth flow channel 17, the second flow channel 16 and the first flow channel 15, and exchanges heat with the battery assembly 4 and other components in the accommodating cavity, and the cooling liquid with increased temperature flows out of the battery box 2 from the liquid outlet 9 after sequentially passing through the inlet 18, the third flow channel 19, the second branch pipe 20 and the second main pipe 21, so as to take out heat in the interior of the battery box 2.

This embodiment is different with ordinary battery box 2 coolant liquid at confined water-cooling board mesocycle, and this battery box 2 coolant liquid can get into battery box 2 inside direct and battery pack 4 contact, consequently, when battery box 2 takes place thermal runaway, can carry out the pressure release with the help of the cooling path, and wherein, pressure release channel has two, first route: the gas sequentially passes through the outlet 11, the first flow passage 15, the second flow passage 16, the fourth flow passage 17, the interface 12, the first branch pipe 13 and the first main pipe 14 and then is discharged out of the battery box 2 from the liquid inlet 10; the second path is as follows: the gas passes through the inlet 18, the third flow channel 19, the second branch pipe 20 and the second main pipe 21 in sequence and then is discharged out of the battery box 2 from the liquid outlet 9, and the two paths jointly act to release the pressure of the battery box 2.

Through the runner of the coolant liquid of directly borrowing battery box 2, the high temperature gas that battery pack produced after thermal runaway passes through coolant liquid runner discharge battery box 2, like this, can be orderly release the pressure in battery box 2 to prevent that bigger danger from taking place.

After the battery device is on fire, under the combined action of the protective cover 1 and the pressure relief channel, the spraying direction of flame can be controlled, so that the flame can only be sprayed towards the bottom of the car, the car body is prevented from being ignited, and the escape time is prolonged.

As shown in fig. 7, in an embodiment of the present invention, a plurality of relief valves 22 are provided on one side of the battery box 2 facing the opening.

Among the above-mentioned technical scheme, at a plurality of relief valves 22 of battery box 2's bottom installation, when thermal runaway took place, a plurality of relief valves 22 can be washed open in the inside pressure increase of battery box 2, like this, gas or flame in battery box 2 are through a plurality of relief valves 22 bottom the car body to ground blowout to prevent that gas or flame from spouting everywhere and causing the automobile body to catch fire.

Specifically, when the internal pressure of the battery box 2 reaches a critical value, the pressure release valve 22 at the bottom of the battery box 2 is opened, so that high-temperature and high-pressure gas in the battery box 2 or generated flame is guaranteed to be sprayed to the lower part of the battery box 2 and towards the ground, and meanwhile, in combination with the protection of the protective cover 1, the high-temperature and high-pressure gas or flame of the battery box 2 only can be sprayed to the bottom of the vehicle body and cannot be sprayed to the vehicle body, so that the vehicle body cannot be ignited, and the time for evacuating the personnel in the vehicle is further increased.

Through setting up pressure release passageway or pressure relief mechanism, when thermal runaway took place, can guide high temperature high-pressure gas or flame to specific orientation release in order to furthest prevents to take place the explosion on fire.

As shown in fig. 8 and 9, in an embodiment of the present invention, the battery box 2 includes a box body 5 and a cover plate 3 disposed on the box body 5, the box body 5 is located in the protection cavity, and the cover plate 3 is located at the opening, so that the cover plate can be ruptured to release pressure when thermal runaway occurs.

Among the above-mentioned technical scheme, apron 3 is located the bottom of battery box 2, other faces except apron 3 are protected to protection casing 1, after battery box 2 packed into the car, apron 3 is located the one side that is close to ground of box 5, when thermal runaway takes place, apron 3 is because intensity is relatively weak, and there is not protection casing 1 protection, and like this, when the gas in battery box 2 increases, break the internal pressure who releases battery box 2 at first, and because apron 3 is in the one side that is close to ground, other faces have the effect that protection casing 1 protected, the inside gas of box or flame will spray to ground, thereby prevent to ignite the automobile body.

Specifically, design into the scheme of easy blasting with apron 3, hoist and mount the battery device on the car, apron 3 towards ground one side, protection casing 1 covers except that the other face of apron 3, and when the pressure in battery box 2 rose, apron 3 initiative broke in order to release battery box 2 internal pressure, combines the effect of protection casing 1 simultaneously, and the high temperature high pressure gas of battery box 2 or flame can only be sprayed towards ground to avoid igniting the automobile body, and then increase the interior personnel's time of withdrawing of car.

It should be noted that the structures of the battery boxes 2 in the above three embodiments can be used in cooperation with each other in one battery box 2.

As shown in fig. 2, an embodiment of the present invention provides a battery device, which includes a battery assembly 4 and the above-mentioned battery protection assembly for protecting the battery assembly 4. The battery device has all the advantages of the battery protector, and the description is omitted.

From the above description, it can be seen that the above-mentioned embodiments of the present invention achieve the following technical effects: the protection casing cladding is in the periphery of battery box, only is equipped with an opening towards ground, and the one side that does not have the protection casing of battery box promptly is towards ground, and the protection casing has high temperature resistant fire behavior, like this, after the battery box takes place thermal runaway, high-temperature gas or flame in the battery box can only spray to ground along the opening to prevent high-temperature gas or flame from spraying to disorder all around, and then protection personnel's safety.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A battery protection assembly, comprising:

protection casing (1), by high temperature resistant material make, protection casing (1) inject the protection chamber that is used for protecting battery box (2) and with an opening of protection chamber intercommunication, just the opening is located the bottom of battery box (2), protection casing (1) are configured into, when battery protection subassembly is installed on the automobile body, the opening sets up towards ground, provides directional pressure release passageway for battery pack (4) in the battery box.

2. The battery protection assembly according to claim 1, wherein the protective cover (1) comprises a first protective piece (31) and four second protective pieces (32) connected to the first protective piece (31), the second protective pieces (32) are arranged at an angle to the first protective piece (31), and the four second protective pieces (32) are connected end to end in sequence along the circumferential direction of the battery box (2) to form the protection cavity.

3. The battery protection assembly according to claim 1, wherein the protective cover (1) is made of a flexible material.

4. A battery protection assembly according to any of claims 1 to 3, further comprising a battery compartment (2) for housing a battery assembly (4), the protective cover (1) being connected to the battery compartment (2).

5. The battery protection assembly according to claim 4, further comprising an adhesive layer between the protective cover (1) and the battery case (2) to connect the protective cover (1) and the battery case (2).

6. The battery protection assembly according to claim 4, wherein the battery box (2) comprises a box body (5) and a cover plate (3) arranged on the box body (5), the box body (5) defines a containing cavity and a liquid inlet (10) and a liquid outlet (9) which are both communicated with the containing cavity, and the containing cavity is used for containing the battery assembly (4) and the cooling liquid.

7. The battery protection assembly according to claim 6, wherein the box body (5) comprises a bottom plate, a first flow channel (15) arranged on the bottom plate, and a plurality of outlets (11) communicated with the first flow channel (15), the outlets (11) are communicated with the accommodating cavity, and the first flow channel (15) is communicated with the liquid inlet (10).

8. The battery protection assembly of claim 7, wherein the housing (5) includes a plurality of the first flow channels (15) spaced apart in a first direction, and the plurality of outlets (11) are arranged in rows and columns.

9. The battery protection assembly according to claim 7, wherein along the second direction, the box body (5) further comprises two first side plates located at two sides of the bottom plate, at least one of the first side plates is provided with a second flow channel (16), one end of the second flow channel (16) is communicated with the first flow channel (15), the other end of the second flow channel (16) is communicated with the liquid inlet (10), and the second direction is arranged at an included angle with the first direction.

10. The battery protection assembly of claim 9, wherein the second flow channel (16) is provided on both of the first side plates, and the case (5) further comprises:

the two second side plates are arranged on two sides of the bottom plate at intervals along a first direction, and the liquid inlet (10) is arranged on one of the two second side plates;

the first main pipe (14) is positioned in the accommodating cavity, and the first main pipe (14) is communicated with the liquid inlet (10);

the two first branch pipes (13) are located in the containing cavity, one ends of the two first branch pipes (13) are respectively communicated with the two second flow passages (16), and the other ends of the two first branch pipes (13) are communicated with the first main pipe (14).

11. The battery protection assembly according to claim 6, wherein the cover plate (3) is provided with a plurality of inlets (18) communicated with the accommodating cavity and a third flow channel (19) communicated with the plurality of inlets (18), and the third flow channel (19) is communicated with the liquid outlet (9).

12. A battery protection assembly according to claim 4, characterized in that the side of the battery box (2) facing the opening is provided with a plurality of pressure relief valves (22).

13. The battery protection assembly according to claim 4, wherein the battery box (2) comprises a box body (5) and a cover plate (3) arranged on the box body (5), the box body (5) is positioned in the protection cavity, and the cover plate (3) is positioned at the opening, so that the cover plate can be broken to release pressure when thermal runaway occurs.

14. A battery device, characterized by comprising a battery assembly (4) and the battery protection assembly of any one of claims 1 to 13 for protecting the battery assembly (4).