CN216055028U - Battery box and battery device - Google Patents

Abstract

The disclosure relates to the technical field of batteries, and discloses a battery box which comprises a first box body, a second box body and a pressure release valve; the second box body is connected below the first box body, a pressure relief structure is arranged between the second box body and the first box body, a filtering structure is arranged in a cavity of the second box body, the second box body comprises a bottom plate, and the bottom plate is positioned on one side of the filtering structure, which is far away from the first box body; the pressure relief valve is arranged on the bottom plate. After the single battery is out of control due to heat, high-temperature gas in the battery flows into the second box body to achieve the effect of thermoelectric separation, and the high-temperature gas is cooled in the second box body to avoid heat diffusion to other batteries; the filter structure can filter sparks or solid particles with high temperature, and the solid particles are prevented from being sprayed out of the battery box, so that secondary fire is prevented; the filtering structure can reduce the speed of high-temperature gas, prevent high-speed gas from spraying out of the battery box and improve the safety; high-temperature gas is sprayed to the ground through the pressure release valve, so that the battery box is prevented from being influenced.

Description

Battery box and battery device

Technical Field

The present disclosure relates to the field of battery technologies, and in particular, to a battery box and a battery device including the same.

Background

A plurality of batteries are installed in the battery pack, and after thermal runaway of a single battery occurs, thermal diffusion is easily caused, so that the thermal runaway of the plurality of batteries is caused, and the whole battery pack is dangerous; therefore, there is a need to prevent heat diffusion from individual cells, avoiding its effect on other cells; but also needs to avoid spraying sparks which are easy to cause fire or solid particles with high temperature to the outside of the battery pack so as to prevent secondary fire.

However, the conventional battery pack has poor heat diffusion prevention capability for a single battery, poor spark filtering performance and low safety.

It is to be noted that the information disclosed in the above background section is only for enhancement of understanding of the background of the present disclosure, and thus may include information that does not constitute prior art known to those of ordinary skill in the art.

SUMMERY OF THE UTILITY MODEL

An object of the present disclosure is to overcome the above-described disadvantage of poor heat diffusion preventive ability of the prior art, and to provide a battery case having a strong heat diffusion preventive ability and a battery device including the same.

According to an aspect of the present disclosure, there is provided a battery case including:

a first case;

the second box body is connected below the first box body, a pressure relief structure is arranged between the second box body and the first box body, a filtering structure is arranged in a cavity of the second box body, the second box body comprises a bottom plate, and the bottom plate is positioned on one side, far away from the first box body, of the filtering structure;

and the pressure release valve is arranged on the bottom plate.

The battery box comprises a first box body and a second box body which are arranged up and down, wherein a filtering structure is also arranged in a cavity of the second box body; batteries can be installed in the first box body, after a single battery is out of control due to heat, high-temperature gas in the battery can flow into the second box body, the thermoelectric separation effect is achieved, the high-temperature gas can be cooled in the second box body, and heat diffusion to other batteries is avoided; the filter structure can filter sparks or solid particles with high temperature, and the solid particles are prevented from being sprayed out of the battery box, so that secondary fire is prevented; the filtering structure can reduce the speed of high-temperature gas and prevent the high-speed gas from being sprayed out of the battery box; in addition, the pressure release valve is arranged on the bottom plate, and the higher-temperature gas generated after thermal runaway of the battery is sprayed out of the bottom of the battery box through the pressure release valve and can be sprayed to the ground, so that the influence on the battery box is avoided.

According to another aspect of the present disclosure, there is provided a battery device including:

a battery box according to any one of the above;

the battery is arranged in the first box body and comprises an explosion-proof valve, and the explosion-proof valve is arranged opposite to a pressure relief structure between the first box body and the second box body.

According to the battery device, the batteries are arranged in the first box body, and after a single battery is out of control due to heat, high-temperature gas in the battery can flow into the second box body through the explosion-proof valve, so that the temperature is reduced in the second box body, and the heat is prevented from being diffused to other batteries; the filter structure can filter sparks or solid particles with high temperature, and the solid particles are prevented from being sprayed out of the battery box, so that secondary fire is prevented; the filtering structure can reduce the speed of high-temperature gas, prevent the high-speed gas from spraying out of the battery box and improve the safety performance of the battery device; in addition, higher-temperature gas generated after thermal runaway of the battery is sprayed to the bottom of the battery device through the pressure release valve and can be sprayed to the ground, so that the influence on the battery device is avoided; and avoids the influence on the electric device for installing the battery device.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the disclosure.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present disclosure and together with the description, serve to explain the principles of the disclosure. It is to be understood that the drawings in the following description are merely exemplary of the disclosure, and that other drawings may be derived from those drawings by one of ordinary skill in the art without the exercise of inventive faculty.

Fig. 1 is an exploded view of an exemplary embodiment of a battery device according to the present disclosure.

FIG. 2 is a schematic bottom view of the battery device of FIG. 1 with the bottom plate removed

Fig. 3 is a schematic perspective view of the first filtering baffle of fig. 1.

Fig. 4 is a partially enlarged structural schematic diagram of a mounting plate of the relief valve in fig. 1.

Fig. 5 is a partially enlarged schematic structural view of a sealing layer of the pressure relief valve in fig. 1.

Fig. 6 is a schematic view of a partially enlarged perspective structure of a pressure relief valve provided with a second filtering baffle.

Fig. 7 is a partial structural view of a battery device provided with a sealing pressure relief structure.

Description of reference numerals:

11. a top cover; 12. a base plate; 13. a first frame; 14. a second frame;

2. a separator plate; 21. a pressure relief vent; 22. a pressure relief structure;

31. a first case; 32. a second case;

41. a middle cross beam; 42. a middle longitudinal beam; 43. a side beam;

5. a first filtering baffle; 51. a top plate; 52. a bottom connection plate; 53. a filter plate; 54. a first filtering hole;

6. a pressure relief channel; 61. an opening;

7. a pressure relief valve; 71. mounting a plate; 711. a connecting plate; 712. a flat plate portion; 713. mounting holes; 714. a through hole; 72. a sealing layer; 721. a flat plate seal portion; 722. an annular seal portion; 723. mounting a column; 724. a groove;

8. a battery module; 81. a battery; 811. an explosion-proof valve;

9. a filter structure;

10. a second filtering baffle; 101. a second filtering hole;

201. and (5) sealing the pressure relief structure.

Detailed Description

Example embodiments will now be described more fully with reference to the accompanying drawings. Example embodiments may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of example embodiments to those skilled in the art. The same reference numerals in the drawings denote the same or similar structures, and thus their detailed description will be omitted. Furthermore, the drawings are merely schematic illustrations of the present disclosure and are not necessarily drawn to scale.

Although relative terms, such as "upper" and "lower," may be used in this specification to describe one element of an icon relative to another, these terms are used in this specification for convenience only, e.g., in accordance with the orientation of the examples described in the figures. It will be appreciated that if the device of the icon were turned upside down, the element described as "upper" would become the element "lower". When a structure is "on" another structure, it may mean that the structure is integrally formed with the other structure, or that the structure is "directly" disposed on the other structure, or that the structure is "indirectly" disposed on the other structure via another structure.

The terms "a," "an," "the," "said," and "at least one" are used to indicate the presence of one or more elements/components/parts/etc.; the terms "comprising" and "having" are intended to be inclusive and mean that there may be additional elements/components/etc. other than the listed elements/components/etc.; the terms "first," "second," and "third," etc. are used merely as labels, and are not limiting on the number of their objects.

The disclosed example embodiment provides a battery box, which, as shown in fig. 1 to 6, may include a pressure release valve 7, a first case 31, and a second case 32; the second box 32 is connected below the first box 31, a pressure relief structure 22 is arranged between the second box 32 and the first box 31, a filter structure 9 is arranged in a cavity of the second box 32, the second box 32 comprises a bottom plate 12, and the bottom plate 12 is positioned on one side of the filter structure 9, which is far away from the first box 31; the pressure relief valve 7 is provided on the bottom plate 12.

According to the battery box disclosed by the invention, after the single battery 81 is out of control due to heat, high-temperature gas in the battery 81 can flow into the second box body 32, so that the thermoelectric separation effect is achieved, the high-temperature gas can be cooled in the second box body 32, and the heat is prevented from being diffused to other batteries 81; the filtering structure 9 can filter sparks or solid particles with high temperature, so that the solid particles are prevented from being sprayed out of the battery box, and secondary fire is prevented; the filtering structure 9 can reduce the speed of high-temperature gas, prevent high-speed gas from spraying out of the battery box and improve the use safety; in addition, the pressure release valve 7 is arranged on the bottom plate 12, and the higher-temperature gas generated after thermal runaway of the battery 81 is sprayed to the bottom of the battery box through the pressure release valve 7 and can be sprayed to the ground, so that the influence on the battery box is avoided.

Based on the same inventive concept, the disclosed example embodiments also provide a battery device, which may include a battery case and a battery 81, as shown with reference to fig. 1 to 6; the battery box is any one of the battery boxes; the battery 81 is disposed in the first case 31, the battery 81 includes an explosion-proof valve 811, and the explosion-proof valve 811 is disposed opposite to the pressure relief structure 22 between the first case 31 and the second case 32.

In the battery device, after thermal runaway of a single battery 81 occurs, high-temperature gas in the battery 81 flows into the second box body 32 through the explosion-proof valve 811, and is cooled in the second box body 32, so that heat is prevented from being diffused to other batteries 81; the filtering structure 9 can filter sparks or solid particles with high temperature, so that the solid particles are prevented from being sprayed out of the battery box, and secondary fire is prevented; the filtering structure 9 can reduce the speed of high-temperature gas, prevent high-speed gas from spraying out of the battery box and improve the safety; in addition, the higher temperature gas after thermal runaway of the battery 81 is sprayed to the bottom of the battery device through the pressure release valve 7 and can be sprayed to the ground, so that the influence on the battery device is avoided; and avoids the influence on the electric device for installing the battery device.

The battery box and the battery device will be described in detail below.

In the present exemplary embodiment, as shown with reference to fig. 1 and 2, the battery case may be provided as a rectangular parallelepiped. Specifically, the battery box may include a top cover 11, a bottom plate 12, two first frames 13, and two second frames 14; the length of the first frame 13 is greater than that of the second frame 14; the two first frames 13 are oppositely arranged, the two second frames 14 are oppositely arranged, and the two first frames 13 and the two second frames 14 are connected end to form a rectangular frame; the top cover 11 is arranged opposite to the bottom plate 12, the top cover 11 is arranged on one side of the rectangular frame, and the bottom plate 12 is arranged on the other opposite side of the rectangular frame. Of course, in other example embodiments of the present disclosure, the battery box may be provided with other shapes, for example, other prism shapes, cylindrical shapes, and the like.

A partition plate 2 is provided in the battery case, the partition plate 2 may be disposed in parallel with the top plate 51 and the bottom plate 12, the partition plate 2 divides the battery case into a first case 31 and a second case 32, and the first case 31 is positioned above the second case 32, i.e., the second case 32 is connected below the first case 31. A plurality of pressure relief holes 21 are provided in the partition plate 2, and the plurality of pressure relief holes 21 make the first tank 31 and the second tank 32 partially communicate, a plurality being at least two, that is, a plurality including two. The isolation plate 2 may be a night cold plate. The pressure relief hole 21 is a pressure relief structure 22; pressure relief structure 22 can also be the weak structure of setting on division board 2, and after battery 81 is inside to take place thermal runaway, high temperature gas, mars or the higher solid particle thing of temperature can break through or melt the weak structure on division board 2, spout from weak structure department.

In particular, a support beam structure is provided within the battery box, which may include one central cross beam 41, two side beams 43 and two central longitudinal beams 42. The two side beams 43 are fixedly attached to the inner side wall of the second frame 14; the middle cross beam 41 and the side beams 43 are arranged in parallel, the middle part of the first box body 31 in the length direction divides the first box body 31 into two areas in the length direction, and two ends of the middle cross beam 41 are fixedly connected with the inner side wall of the first frame 13; the two middle longitudinal beams 42 are symmetrically positioned at two sides of the middle cross beam 41, the middle longitudinal beams 42 are perpendicular to the middle cross beam 41, the two middle longitudinal beams 42 are arranged at one side of the isolation plate 2 far away from the middle cross beam 41, the occupation of the inner space of the first box body 31 is avoided, more batteries 81 can be accommodated in the first box body 31, and the middle longitudinal beams 42 and the middle cross beam 41 fix the isolation plate 2 at two sides of the isolation plate 2, so that the fixing effect of the isolation plate 2 is improved; the middle longitudinal beam 42 is fixedly connected with the inner side wall of the first frame 13; one intermediate cross member 41 and two intermediate longitudinal members 42 divide the first tank 31 into four regions. Of course, the specific structure of the support beam structure is not limited to the above description, for example, the support beam structure may include two middle cross beams 41 or one middle longitudinal beam 42, and may further include more side beams 43, and the side beams 43 may be attached and fixed to the inner side wall of the first side frame 13; the first casing 31 may be divided into two or more regions, which will not be described in detail herein.

A projection is provided in the middle of each of the center cross member 41 and the two side frames 43, and a screw hole is provided in the projection. The width of the protruding portion is larger than the width of the other portions, so that the requirement for fixing the support beam structure and the partition plate 2 is met, the support beam structure occupies a smaller volume of the first box 31, and the influence on the energy density of the battery device is avoided.

The division board 2 can be arranged on one side of the middle cross beam 41 far away from the top cover 11, a plurality of through holes are arranged on the division board 2, the plurality of through holes correspond to threaded holes in the support beam structure, and screws penetrate through the through holes in the division board 2 and are in threaded fit with the threaded holes, so that the division board 2 and the support beam structure are fixed. Foam is arranged between the isolation plate 2 and the supporting beam structure, so that absolute sealing between the isolation plate 2 and the supporting beam structure is realized. This assembled mode is convenient, and division board 2 can have independent processing, and division board 2 can dismantle the change alone moreover. The support beam structure can support the isolation plate 2, so that the rigidity of the isolation plate 2 meets the requirement. Of course, the partition plate 2 may be provided on the side of the support beam structure adjacent to the roof 11 as required.

The partition plate 2 is provided with a plurality of relief holes 21. Some pressure relief holes 21 are arranged in a row along the first direction, a plurality of pressure relief holes 21 are arranged in four rows, and the number of rows of pressure relief holes 21 is the same as the number of battery modules 8.

Four battery modules 8 are arranged on one side of the partition plate 2 close to the top cover 11, and one battery module 8 is arranged above one row of pressure relief holes 21. Each battery module 8 includes a plurality of batteries, and one battery module 8 is provided in one region of the first case 31, and a gap is provided between two adjacent battery modules 8, so that the influence on other battery modules 8 can be reduced as much as possible under the condition that a certain battery in one battery module 8 is out of control due to heat, thereby further reducing thermal diffusion. Of course, in the case where the first case 31 is divided into two or more regions, correspondingly, two or more battery modules 8 may be provided, and correspondingly, two or more rows of pressure release holes 21 may be provided.

Be provided with explosion-proof valve 811 on battery 81, explosion-proof valve 811 can be the weak structure that sets up on battery case, and after battery 81 is inside to take place thermal runaway, the weak structure on the battery case can be broken through to high temperature gas, mars or the higher solid particle thing of temperature, spouts from weak structure department. The explosion-proof valve 811 of the battery 81 is arranged opposite to the pressure relief hole 21 on the isolation plate 2, namely, one battery 81 corresponds to one pressure relief hole 21; so that the high temperature gas, sparks or high temperature solid particles sprayed from the explosion-proof valve 811 can be sprayed into the second box 32 from the pressure release hole 21, thereby preventing the high temperature substances from generating heat diffusion in the first box 31 to affect other batteries 81, and further reducing the heat diffusion.

When a plurality of explosion-proof valves 811 are provided in one battery 81, more pressure-release holes 21 may be provided in the partition plate 2, so that one explosion-proof valve 811 can be disposed opposite to one pressure-release hole 21, and high-temperature substances in the thermal runaway battery 81 can be ejected from the battery 81 into the second case 32 at a higher speed, thereby reducing the thermal runaway time and further reducing thermal diffusion.

The second box 32 is provided with a filter structure 9 in the cavity.

In the present exemplary embodiment, the filter structure 9 may include eight first filtering baffles 5, the eight first filtering baffles 5 are vertically disposed between the partition plate 2 and the bottom plate 12, that is, the first filtering baffles 5 are vertically disposed with both the partition plate 2 and the bottom plate 12, and the first filtering baffles 5 are connected between the partition plate 2 and the bottom plate 12.

Referring to fig. 3, the first filter baffle 5 may include a top plate 51, a bottom connection plate 52, and filter plates 53, the top plate 51 and the bottom connection plate 52 being perpendicularly connected to opposite sides of the filter plates 53, and the top plate 51 and the bottom connection plate 52 extending toward the same side of the filter plates 53, such that the first filter baffle 5 forms a "U" shape. The top plate 51 can be fixedly connected with the isolation plate 2 through screws, the bottom connecting plate 52 can be fixedly connected with the bottom plate 12 through screws, and the top plate 51 and the bottom connecting plate 52 can facilitate the fixed connection of the first filtering baffle 5 with the isolation plate 2 and the bottom plate 12, increase the strength of the first filtering baffle 5, provide a support with sufficient strength for the isolation plate 2, and thus provide a support with sufficient strength for the battery 81. Of course, in other exemplary embodiments of the present disclosure, the first filtering baffle 5 may also be provided in a single plate shape, and the first filtering baffle 5 may also be provided in an i-shape.

The first filtering baffle 5 not only provides enough strength for the isolation plate 2, but also improves the strength and the anti-impact capability of the bottom plate 12, and avoids excessive deformation in the process of being installed on a vehicle for supporting the bottom.

The first filtering baffle 5 is provided with a plurality of first filtering holes 54, the first filtering holes 54 can be circular holes, and the diameter of the first filtering holes 54 is less than or equal to 2 mm. The plurality of first filtering holes 54 can filter sparks or solid particles with high temperature, and prevent the solid particles from being sprayed out of the battery box. A plurality of first filtering holes 54 may be arranged in an array on the filtering plate 53. For example, the first filtering holes 54 may be arranged in a group in an array, a gap may be provided between two adjacent groups of the first filtering holes 54, the filtering plate 53 in the gap is of a solid structure, the first filtering holes 54 are not provided, and the width of the gap is greater than the distance between two adjacent first filtering holes 54 in a group, so that the strength of the filtering plate 53 is ensured, and the filtering effect of the filtering plate 53 is also ensured.

With continued reference to fig. 1 and 2, the first filtering baffle 5 is configured as an elongated strip, and the first filtering baffle 5 extends along a first direction. Two first filtering baffles 5 are arranged into one group, and eight first filtering baffles 5 form four groups; a pressure relief channel 6 is formed between the two first filtering baffles 5, one pressure relief channel 6 is arranged opposite to the group of pressure relief holes 21, namely the pressure relief channel 6 is positioned on one side, away from the top cover 11, of the pressure relief holes 21, so that high-temperature gas, sparks or solid particles with high temperature sprayed from the pressure relief holes 21 are directly sprayed into the pressure relief channel 6, and then the high-temperature gas, sparks or solid particles with high temperature are filtered through the first filtering baffles 5 on the two sides of the pressure relief channel 6, so that the sparks or the solid particles with high temperature are prevented from being sprayed to the pressure relief valve 7; the direction of the air flow can be controlled through the pressure relief channel 6, the path of the air flow is increased, and the air flow is favorably cooled and decelerated; the total length of a set of pressure relief holes 21 is less than or equal to the length of the first filtering baffle 5, so that a set of pressure relief holes 21 are arranged in the pressure relief channel 6, the filtering effect is guaranteed, and the safety performance is improved.

Two first filtering baffle 5 parallel arrangement for the both ends of pressure release channel 6 are formed with opening 61, under the more circumstances of the high-temperature gas of battery 81 spun, are favorable to the discharge of high-temperature gas. Of course, the two first filtering baffles 5 may be arranged non-parallel, i.e. the two first filtering baffles 5 may be arranged crosswise, so that one ends of the two first filtering baffles 5 meet and the opposite other ends are formed with openings 61.

In addition, in some other exemplary embodiments of the present disclosure, three or four first filtering baffles 5 may form a group, and three or four first filtering baffles 5 form a pressure relief channel 6 around, and the pressure relief channel 6 is disposed opposite to one pressure relief hole 21. Or, the orthographic projections of the first filtering baffles 5 on the partition board 2 form a grid shape, and one grid is correspondingly provided with one pressure relief hole 21. Can improve the filtering effect and the use safety.

In further exemplary embodiments of the present disclosure, the first filtering baffle 5 may be provided in a cylindrical shape, and a pressure relief channel 6 is formed inside the cylinder of the first filtering baffle 5, and the pressure relief channel 6 may be provided opposite to one or at least two pressure relief holes 21.

In still other exemplary embodiments of the present disclosure, the first filtering baffle 5 may be disposed in the pressure relief hole 21, and high-temperature gas, spark or high-temperature solid particles injected from the inside of the battery 81 to the pressure relief hole 21 may be directly filtered by the first filtering baffle 5, so as to avoid heat diffusion and influence on other batteries 81 or structures.

With continued reference to fig. 1 and fig. 2, the pressure relief valve 7 of the battery box is located on a side of the first filtering baffle 5 away from the pressure relief channel 6, and the pressure relief valve 7 is located away from the opening 61 of the pressure relief channel 6. The gas sprayed out of the battery 81 can be discharged through the pressure release valve 7, so that rapid pressure release is facilitated, and the pressure release valve 7 of the battery device is designed downwards, namely towards the ground, so that when thermal runaway occurs, people or objects can be prevented from being injured; and the number of the batteries 81 in the battery device is large, so that the rapid and safe pressure relief is facilitated, and the heat expansion to other batteries 81 is avoided, so that the other batteries 81 generate thermal runaway.

In the present exemplary embodiment, four relief valves 7 are provided, two relief valves 7 are provided in one set, and the two relief valves 7 in one set are arranged in the second direction and are located between the two sets of first filter plates 53. The two relief valves 7 of one set are located at the middle position in the length direction of the first filter plate 53 such that the relief valves 7 are located away from the opening 61 of the relief passage 6. High-temperature gas, sparks or solid particles with high temperature ejected from the pressure release holes 21 can reach the pressure release valve 7 only by filtering through the first filter plate 53, so that the sparks or the solid particles with high temperature are prevented from being ejected to the pressure release valve 7, and the plastic sealing layer 72 of the pressure release valve 7 is prevented from being damaged; even there is some spark or the higher solid particle of temperature to spout from opening 61, because opening 61 is far away to relief valve 7's distance, the higher solid particle of spark or temperature can lower the temperature or fall to bottom plate 12 at the in-process that spouts to relief valve 7 on, can avoid producing the destruction to the plastic sealing layer 72 of relief valve 7 equally, avoid outside the relief valve 7 blowout battery box, prevent to cause secondary fire, improved the safety in utilization moreover.

The pressure relief valve 7 may comprise a mounting plate 71 and a sealing layer 72. The attachment plate 71 is connected to the base plate 12, the base plate 12 is provided with attachment through holes 714, the attachment plate 71 is attached to the attachment through holes 714, the attachment plate 71 may be provided integrally with the base plate 12, that is, the attachment plate 71 may be integrally formed with the base plate 12.

Referring to fig. 4, the mounting plate 71 may be provided in a circular shape. The mounting plate 71 may include a connecting plate 711 and a flat plate portion 712, the connecting plate 711 being provided in a circular ring shape, and the connecting plate 711 being provided in an inclined shape protruding to a side away from the partition plate 2, i.e., an inner ring surface of the connecting plate 711 is farther from the partition plate 2 with respect to an outer ring surface; the inner ring surface of the link plate 711 is connected to the flat plate portion 712, and the outer ring surface of the link plate 711 is connected to the bottom plate 12, so that the mounting plate 71 projects to the side away from the partition plate 2.

The flat plate portion 712 of the mounting plate 71 is provided with a mounting hole 713, and the mounting hole 713 may be provided at a central position of the flat plate portion 712; the flat plate portion 712 is provided with four through holes 714, the through holes 714 are communicated with the inside of the second case 32, and the through holes 714 are fan-shaped.

The sealing layer 72 is made of elastic material, such as plastic, rubber, etc. Referring to fig. 5, the sealing layer 72 may include a flat plate sealing portion 721, an annular sealing portion 722, and a mounting post 723. The sealing layer 72 is formed in a circular shape, the flat plate sealing portion 721 is formed in a circular shape, the annular sealing portion 722 is formed in an annular shape, the inner annular surface of the annular sealing portion 722 is connected to the outer annular surface of the flat plate sealing portion 721, and the annular sealing portion 722 is formed in a structure inclined toward the bottom plate 12. The mounting post 723 is arranged at the center of the flat plate sealing part 721, a groove 724 surrounding a neutral axis of the mounting post 723 is arranged on the mounting post 723, the mounting post 723 can deform during mounting due to the elasticity of the sealing layer 72, the mounting post 723 is mounted in the mounting hole 713, the flat plate part 712 is clamped in the groove 724, the connection stability of the sealing layer 72 and the mounting plate 71 is guaranteed, and the sealing layer 72 cannot be flushed away when high-temperature and high-pressure gas flows out inside; the seal layer 72 is attached to the attachment plate 71 such that the annular seal portion 722 is attached to the link plate 711 and the flat seal portion 721 is attached to the flat plate portion 712, that is, the seal layer 72 covers the attachment plate 71 on the side away from the partition plate 2. The annular sealing part 722 and the connecting plate 711 form a covered sealing structure, so that external water vapor is difficult to enter the battery box, the sealing layer 72 can well seal the through holes 714 and the mounting holes 713 on the mounting plate 71, and the requirement on the sealing performance of the battery box is met.

When the battery 81 is out of control due to heat, and high-temperature gas is injected into the second box 32, the gas pressure of the second box 32 gradually increases, and after a certain gas pressure is reached, due to the elastic structure of the sealing layer 72, the gas can generate a gap between the sealing layer 72 and the mounting plate 71 for the sealing layer 72 of the relief valve 7, and the high-temperature gas can be discharged from the gap, and along with the discharge of the gas, the internal pressure in the second box 32 gradually decreases, the sealing surface between the sealing layer 72 and the mounting plate 71 gradually recovers, an external one-way seal is formed again, and a recoverable sealing structure is further formed.

Of course, in other example embodiments of the present disclosure, the number of through holes 714 and the position of the mounting hole 713 may be set as desired; the mounting plate 71 may also be configured in a rectangular shape, an oval shape, etc., and correspondingly, the sealing layer 72 may also be configured in a rectangular shape, an oval shape, etc.; the mounting plate 71 may be recessed toward the side closer to the partition plate 2, and correspondingly, the sealing layer 72 may be recessed toward the side closer to the partition plate 2 so as to cover the side of the mounting plate 71 away from the partition plate 2. The sealing and pressure relief effects described above can also be achieved.

In another example embodiment of the present disclosure, referring to fig. 6, the filtering structure 9 may include a second filtering baffle 10, and the second filtering baffle 10 is provided with a plurality of second filtering holes 101, the plurality being at least two, that is, the plurality includes two. The second filtering baffle 10 is arranged on one side of the pressure release valve 7 close to the isolation plate 2; the second filtering baffle 10 may be arranged parallel to the bottom plate 12, the area of the second filtering baffle 10 being substantially the same as the area of the pressure relief valve 7, or slightly larger than the area of the pressure relief valve 7. Alternatively, in still another exemplary embodiment of the present disclosure, the second filtering baffle 10 is disposed around the pressure relief valve 7 and is disposed perpendicular to the bottom plate 12, that is, the second filtering baffle 10 is vertically connected between the partition plate 2 and the bottom plate 12, and the plurality of second filtering baffles 10 surround the pressure relief valve 7. High temperature gas, mars or the higher solid particle thing of temperature that erupts from the battery 81 can be filtered through second filtering baffle 10, avoids mars or the higher solid particle thing of temperature to spout to sealing layer 72, causes the burn to sealing layer 72, or jets out from relief valve 7, causes secondary fire.

In one battery case, the second filtering baffle 10 may be provided simultaneously with the first filtering baffle 5, or the second filtering baffle 10 or the first filtering baffle 5 may be provided separately.

In still another example embodiment of the present disclosure, as shown in fig. 7, the battery case may further include a sealing pressure relief structure 201, and the sealing pressure relief structure 201 is provided at a side of the pressure relief hole 21 close to the bottom plate 12 or far from the bottom plate 12. The sealing pressure relief structure 201 can be arranged in a plate shape, the thickness of the sealing pressure relief structure 201 is small, the sealing pressure relief structure can be melted when heated, when the battery 81 is out of control due to heat and high-temperature high-pressure gas is sprayed out, the high-temperature high-pressure gas can burst or melt the sealing pressure relief structure 201 with the small thickness, and the high-temperature high-pressure gas is sprayed into the second box body 32. When the battery device is in a normal state, the battery box body is required to have sealing performance, and the sealing pressure relief structure 201 can ensure the sealing performance of the first box body 31, so that the sealing performance of the battery box body is ensured.

The battery device can be a battery pack, and a plurality of battery modules 8 are arranged in the battery box; the battery device may be a battery module in which a plurality of batteries 81 are mounted in a battery box.

Other embodiments of the disclosure will be apparent to those skilled in the art from consideration of the specification and practice of the disclosure disclosed herein. This application is intended to cover any variations, uses, or adaptations of the disclosure following, in general, the principles of the disclosure and including such departures from the present disclosure as come within known or customary practice within the art to which the disclosure pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the disclosure being indicated by the following claims.

Claims (10)

1. A battery box, comprising:

a first case;

the second box body is connected below the first box body, a pressure relief structure is arranged between the second box body and the first box body, a filtering structure is arranged in a cavity of the second box body, the second box body comprises a bottom plate, and the bottom plate is positioned on one side, far away from the first box body, of the filtering structure;

and the pressure release valve is arranged on the bottom plate.

2. The battery box according to claim 1, characterized in that the battery box comprises:

the battery box is provided with a first box body and a second box body, the first box body and the second box body are respectively arranged on the battery box, the battery box is divided into a plurality of battery boxes by the partition board, a plurality of pressure relief holes are formed in the partition board, the pressure relief holes are pressure relief structures, and the bottom plate and the partition board are arranged at intervals.

3. The battery box of claim 2, wherein the filter structure comprises:

the first filtering baffle is arranged between the isolation plate and the bottom plate or in the pressure relief holes, and a plurality of first filtering holes are formed in the first filtering baffle.

4. The battery box of claim 3, wherein the first filtering baffle is connected between the isolation plate and the bottom plate, and one or at least two first filtering baffles form a pressure relief channel, and the pressure relief channel is opposite to one or at least two pressure relief holes.

5. The battery box of claim 4, wherein two of said first filtering baffles form a group, and a pressure relief channel is formed between said first filtering baffles of a group, and a plurality of said pressure relief holes are arranged in a row along a first direction, said first filtering baffles extend along the first direction, and said pressure relief channel is disposed opposite to said row of said pressure relief holes.

6. The battery box according to claim 5, wherein two first filtering baffles are arranged in parallel so that openings are formed at both ends of the pressure relief channel.

7. The battery box of claim 6, wherein the pressure relief valve is located on a side of the first filtering baffle facing away from the pressure relief channel and is located away from the opening.

8. The battery box of claim 2, wherein the filter structure comprises:

the second filtering baffle is arranged on one side of the pressure release valve close to the isolation plate;

the second filtering baffle is arranged in parallel with the bottom plate, or the second filtering baffle is arranged around the pressure release valve and connected between the isolation plate and the bottom plate.

9. The battery box of claim 2, further comprising:

and the sealing pressure relief structure is arranged on one side of the pressure relief hole close to or far away from the bottom plate.

10. A battery device, comprising:

a battery box according to any one of claims 1 to 9;

the battery is arranged in the first box body and comprises an explosion-proof valve, and the explosion-proof valve is arranged opposite to a pressure relief structure between the first box body and the second box body.

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