CN220774643U - Battery and battery device - Google Patents

Abstract

The utility model relates to the technical field of batteries and discloses a battery and a battery device; the battery comprises a battery shell, an electric core and a protection sheet; the battery shell is provided with a containing cavity, a pressure relief structure and a concave part are arranged on the battery shell, the concave part is arranged on one side of the battery shell, which is away from the containing cavity, and the pressure relief structure is arranged on the concave part; the battery cell is arranged in the accommodating cavity; at least part of the protection sheet is arranged in the concave part, the pressure relief structure comprises a weak part, the orthographic projection of the weak part on the first reference surface is positioned in the orthographic projection of the protection sheet on the first reference surface, and the first reference surface is parallel to the surface of the battery shell where the pressure relief structure is arranged. The concave part of the battery can protect the protective sheet, so that the falling-off of the protective sheet is reduced or even avoided; and the outside gas and liquid are prevented from entering the battery shell, so that the tightness of the battery shell is improved.

Description

Battery and battery device

Technical Field

The disclosure relates to the technical field of batteries, and in particular relates to a battery and a battery device comprising the battery.

Background

At present, a pressure relief structure is arranged on the battery shell, and a protection sheet is arranged outside the pressure relief structure, but the protection sheet is adhered to a boss of the battery shell, so that the protection sheet is easy to fall off; and the battery occupies a larger space, which is unfavorable for improving the space utilization rate and the energy density of the battery device.

It should be noted that the information disclosed in the above background section is only for enhancing 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.

Disclosure of Invention

The present disclosure is directed to overcoming the drawbacks of the related art described above and providing a battery and a battery device including the same.

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

the battery shell is provided with a containing cavity, a pressure relief structure and a concave part are arranged on the battery shell, the concave part is arranged on one side of the battery shell, which is away from the containing cavity, and the pressure relief structure is arranged on the concave part;

the battery cell is arranged in the accommodating cavity;

the protection sheet is at least partially arranged in the concave part, the pressure relief structure comprises a weak part, the orthographic projection of the weak part on the first reference surface is positioned in the orthographic projection of the protection sheet on the first reference surface, and the first reference surface is parallel to the surface of the battery shell where the pressure relief structure is arranged.

According to the battery disclosed by the utility model, at least part of the protection sheet is arranged in the concave part, so that on one hand, the concave part can protect the protection sheet, and the falling-off of the protection sheet is reduced or even avoided; on the other hand, the path of the external gas and liquid entering the space between the protective sheet and the pressure relief structure is increased, so that the external gas and liquid are difficult to enter the space between the protective sheet and the pressure relief structure, the external gas and liquid are prevented from entering the battery shell, and the tightness of the battery shell is improved.

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

a battery box including a bottom plate;

the battery, for foretell battery, pressure release structure sets up towards the bottom plate.

According to the battery device, on one hand, the concave part can protect the protection sheet, so that falling of the protection sheet is reduced or even avoided; on the other hand, the path of the external gas and liquid entering the space between the protective sheet and the pressure relief structure is increased, so that the external gas and liquid are difficult to enter the space between the protective sheet and the pressure relief structure, the external gas and liquid are prevented from entering the battery shell, and the tightness of the battery shell is improved; in yet another aspect, the space occupied by the protective sheet outside the battery is reduced or even avoided, which is beneficial to improving the space utilization and energy density of 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 disclosure and together with the description, serve to explain the principles of the disclosure. It will be apparent to those of ordinary skill in the art that the drawings in the following description are merely examples of the disclosure and that other drawings may be derived from them without undue effort.

Fig. 1 is a schematic cross-sectional structure of an example embodiment of a battery of the present disclosure.

Fig. 2 is an enlarged partial schematic view of the portion indicated by I in fig. 1.

Fig. 3 is a schematic structural view of another example embodiment of the bottom wall of the battery of the present disclosure mated with a protective sheet.

Fig. 4 is a schematic structural view of still another example embodiment of the bottom wall of the battery of the present disclosure mated with a protective sheet.

Fig. 5 is a schematic structural view of another example embodiment of the bottom wall of the battery of the present disclosure mated with a protective sheet.

Fig. 6 is a schematic bottom view of a battery of the present disclosure.

Fig. 7 is a schematic cross-sectional structure of an example embodiment of a battery device of the present disclosure.

Reference numerals illustrate:

1. a battery case; 11. a bottom wall; 111. a recessed portion; 1111. an air guide groove; 112. a first step; 113. a second step; 12. a cover plate; 13. a sidewall;

2. a pressure relief structure; 21. a weak portion;

3. a protective sheet; 4. an adhesive layer;

5. a battery cell; 51. a main body portion; 52. a first tab; 53. a second lug;

6. a pole assembly; 7. a welding part;

10. a battery;

20. a battery box; 201. a bottom plate; 202. a first side frame; 203. and a protective cover.

Detailed Description

Example embodiments will now be described more fully with reference to the accompanying drawings. However, the exemplary embodiments can be embodied in many 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 the example embodiments to those skilled in the art. The same reference numerals in the drawings denote the same or similar structures, and thus detailed descriptions thereof 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" are used in this specification to describe the relative relationship of one component of an icon to another component, these terms are used in this specification for convenience only, such as in terms of the orientation of the examples described in the figures. It will be appreciated that if the device of the icon is flipped upside down, the recited "up" component will become the "down" component. 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 through another structure.

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

In the present application, unless explicitly specified and limited otherwise, the term "coupled" is to be construed broadly, and for example, "coupled" may be either fixedly coupled, detachably coupled, or integrally formed; can be directly connected or indirectly connected through an intermediate medium. "and/or" is merely an association relationship describing an association object, and means that three relationships may exist, for example, a and/or B may mean: a exists alone, A and B exist together, and B exists alone. In addition, the character "/" herein generally indicates that the front and rear associated objects are an "or" relationship.

The present disclosure provides a battery 10, and referring to fig. 1 to 5, the battery 10 may include a battery case 1, a battery cell 5, and a protection sheet 3; the battery shell 1 is provided with a pressure relief structure 2 and a concave part 111, the concave part 111 is arranged on one side of the battery shell 1 deviating from the accommodating cavity, and the pressure relief structure 2 is arranged on the concave part 111; the battery cell 5 is arranged in the accommodating cavity; at least part of the protection sheet 3 is arranged in the concave part 111, the pressure relief structure 2 comprises a weak part, the orthographic projection of the weak part on the first reference surface is positioned in the orthographic projection of the protection sheet 3 on the first reference surface, and the first reference surface is parallel to the surface of the battery shell 1 where the pressure relief structure 2 is arranged.

The battery 10 and the battery device of the disclosure, on one hand, enable the concave portion 111 to protect the protection sheet 3, reduce or even avoid the falling-off of the protection sheet 3; on the other hand, the path of the external gas and liquid entering the space between the protective sheet 3 and the pressure relief structure 2 is increased, so that the external gas and liquid are difficult to enter the space between the protective sheet 3 and the pressure relief structure 2, the external gas and liquid are prevented from entering the battery shell 1, and the tightness of the battery shell 1 is improved; on the other hand, the space occupied by the protective sheet 3 outside the battery 10 is reduced or even avoided, which is advantageous in improving the space utilization and energy density of the battery device.

In the present exemplary embodiment, referring to fig. 1, the battery 10 may be a quadrangular battery, that is, the battery 10 may be provided in the shape of a rectangular parallelepiped, and correspondingly, the battery case 1 may be provided in the shape of a rectangular parallelepiped, and the battery case 1 may include six walls; six walls are a cover plate 12, a bottom wall 11 and four side walls 13; the four side walls 13 are arranged in pairs; the four side walls 13 are connected end to end in sequence to form a rectangular cylinder. A cover plate 12 is connected to one side of the four side walls 13, and a bottom wall 11 is connected to the opposite side of the four side walls 13 such that the bottom wall 11 is disposed opposite to the cover plate 12. Also, the bottom wall 11 and the four side walls 13 are integrally formed, i.e., the bottom wall 11 and the four side walls 13 may be formed by an integral molding process instead of being separately formed and then connected as an integral structure, for example, the bottom wall 11 and the four side walls 13 may be formed by punching. The cover plate 12 is welded to the side of the four side walls 13 facing away from the bottom wall 11. The bottom wall 11, the cover plate 12 and the four side walls 13 surround the accommodation chamber forming the battery case 1.

The material of the battery case 1 may be aluminum, steel, or other metal or alloy materials, but of course, other materials are also possible, and will not be described here.

Of course, in other example embodiments of the present disclosure, the bottom wall 11 and the cover plate 12 may be provided in a circular shape, an oval shape, a trapezoid shape, etc., and the side wall 13 may be provided in one or more and formed around the circular shape, the oval shape, the trapezoid shape, etc., such that the battery case 1 is formed in a cylindrical shape, an oval cylindrical shape, a prismatic shape, etc.

In the present exemplary embodiment, as shown with reference to fig. 1, the battery cell 5 is provided in the accommodation chamber of the battery case 1. The battery cell 5 may include a main body portion 51, a first tab 52, and a second tab 53; the main body 51 may include a first pole piece, a separator, and a second pole piece that are sequentially stacked. The battery cell 5 may be a winding type, and the winding type battery cell 5 is formed by winding a laminated structure formed by the first pole piece, the separator and the second pole piece. The main body 51 is also provided in a substantially rectangular parallelepiped structure to be fitted to the battery case 1 having a rectangular parallelepiped structure. The first pole piece and the second pole piece are coated with different active substances.

In other example embodiments of the present disclosure, the body portion 51 may be laminated, and the first pole piece, the separator, and the second pole piece are all provided in multiple layers, and the body portion 51 is also provided in a rectangular parallelepiped structure in order to be mated with the battery case 1 of a rectangular parallelepiped structure.

The first tab 52 and the second tab 53 may be disposed on one side of the body portion 51 adjacent to the cover plate 12, although the first tab 52 and the second tab 53 may be disposed on opposite sides of the body portion 51 adjacent to the side wall 13.

The first tab 52 and the second tab 53 are conductive foil areas not provided with an active material coating, i.e., no active material coating is applied to the first tab 52 and the second tab 53, and a current collecting layer is used for transmitting current.

As a core charge-discharge structure of the battery 10, the battery cell 5 needs to be led out to the battery case 1 through the two pole assemblies 6 to form the positive and negative poles.

In the present exemplary embodiment, referring to fig. 1, two pole assemblies 6 are connected to the battery case 1, specifically, two through holes are provided on the cap plate 12, and the two pole assemblies 6 penetrate through the two through holes in a one-to-one correspondence manner, so that one ends of the two pole assemblies 6 are electrically connected to the first tab 52 and the second tab 53, and the other ends of the two pole assemblies 6 extend out of the battery case 1 and can be connected to a bus bar after the batteries are assembled. And the pole assembly 6 is connected with the cover plate 12 in a clamping way.

In the present exemplary embodiment, referring to fig. 1, a pressure relief structure 2 is provided on a battery case 1, specifically, a pressure relief structure 2 is provided on a bottom wall 11 such that the pressure relief structure 2 and a pole assembly 6 are provided on different walls of the battery case 1.

Referring to fig. 6, the pressure relief structure 2 may include a weak portion 21, and specifically, the pressure relief structure 2 may include the weak portion 21 provided on the bottom wall 11, where the weak portion 21 is the weakest (for example, may be the thinnest or the weakest) portion of the pressure relief structure 2. After the electric core 5 is in thermal runaway, the weak part 21 on the bottom wall 11 can be broken through by high-temperature gas, sparks and high-temperature solid particles, and the gas, sparks and high-temperature solid particles are sprayed out of the weak part 21, so that the explosion of the single battery 10 is avoided; and can realize directional pressure release.

The weaknesses 21 may include scratches, score lines, etc., the scratches may be formed by machining, the score lines may be formed by photolithography or chemical etching. It is also possible that the thickness of the weakening 21 is thinner at the whole relief structure 2 than elsewhere.

In the present exemplary embodiment, referring to fig. 1, a recess 111 is provided on the battery case 1, specifically, a recess 111 is provided on the bottom wall 11, and the recess 111 is located on the side of the battery case 1 facing away from the accommodating chamber, that is, the recess 111 is located on the outer surface of the battery case 1, and the pressure release structure 2 is provided in the recess 111.

At least part of the protective sheet 3 is disposed in the recess 111, and for example, the protective sheet 3 may be entirely disposed in the recess 111, or a part of the protective sheet 3 may be disposed in the recess 111.

So arranged, the concave part 111 can protect the protective sheet 3, and the falling-off of the protective sheet 3 is reduced or even avoided; moreover, the path of the external gas and liquid entering the space between the protective sheet 3 and the pressure relief structure 2 is increased, so that the external gas and liquid are difficult to enter the space between the protective sheet 3 and the pressure relief structure 2, thereby avoiding the external gas and liquid from entering the battery shell 1 and increasing the tightness of the battery shell 1.

Moreover, the orthographic projection of the weak portion 21 of the pressure release structure 2 on the first reference surface is positioned in the orthographic projection of the protection sheet 3 on the first reference surface, so that the protection sheet 3 can cover the pressure release structure 2, and the pressure release structure 2 can be protected through the protection sheet 3 due to weaker strength of the pressure release structure 2, so that the pressure release structure 2 failure caused by the puncture of the pressure release structure 2 by other external structures and the leakage of the battery shell 1 are avoided.

The first reference plane is parallel to the surface of the battery case 1 on which the pressure release structure 2 is provided, i.e., the first reference plane is parallel to the surface of the battery case 1 where the area of the bottom wall 11 is largest.

The orthographic projection of the concave portion 111 on the first reference plane refers to an area surrounded by orthographic projections of the outermost edge of the concave portion 111 on the first reference plane.

Further, referring to fig. 2, the total depth H1 of the recess 111 is 0.2mm or more and 1.2mm or less, for example, the depth H1 of the recess 111 may be 0.3mm, 0.5mm, 0.8mm, 1mm, 1.1mm, or the like.

If the total depth H1 of the recess 111 is too deep, the thickness of the bottom wall 11 of the bottom of the recess 111 is too thin, so that the bottom wall 11 of the bottom of the recess 111 is liable to be broken or the like, and the strength of the battery case 1 is reduced.

If the total depth H1 of the recess 111 is too shallow so that the protection sheet 3 protrudes more from the bottom wall 11 of the battery case 1, there is still a risk that the protection sheet 3 is easily detached.

The above numerical range not only ensures that the bottom wall 11 at the bottom of the recess 111 does not have defects such as breakage, etc., so as to ensure the strength of the battery case 1; but also ensures that the protective sheet 3 is not easy to fall off.

Further, referring to fig. 2, the ratio of the total depth H1 of the concave portion 111 to the wall thickness H2 of the battery case 1 is 0.1 or more and 0.8 or less, specifically, the ratio of the total depth H1 of the concave portion 111 to the thickness H2 of the bottom wall 11 is 0.1 or more and 0.8 or less; for example, the ratio of the total depth of the recess 111 to the wall thickness of the battery case 1 may be 0.12, 0.15, 0.17, 0.2, 0.23, 0.25, 0.28, 0.3, 0.32, 0.35, 0.37, 0.4, 0.43, 0.45, 0.48, 0.5, 0.52, 0.55, 0.57, 0.6, 0.63, 0.65, 0.68, 0.7, 0.72, 0.75, 0.77, and so on.

Similarly, if the ratio of the total depth of the recess 111 to the wall thickness of the battery case 1 is too large, the total depth of the recess 111 is too deep, the thickness of the bottom wall 11 of the bottom of the recess 111 is too thin, the bottom wall 11 of the bottom of the recess 111 is liable to be broken or the like, and the strength of the battery case 1 is reduced.

If the ratio of the total depth of the recess 111 to the wall thickness of the battery case 1 is too small, so that the total depth of the recess 111 is too shallow, so that the protection sheet 3 protrudes more from the bottom wall 11 of the battery case 1, there is still a risk that the protection sheet 3 is easily detached.

The above numerical range not only ensures that the bottom wall 11 at the bottom of the recess 111 does not have defects such as breakage, etc., so as to ensure the strength of the battery case 1; but also ensures that the protective sheet 3 is not easy to fall off.

The wall thickness H2 of the battery case 1 refers to the thickness of the wall body of the battery case 1 where the recess 111 is provided, and for example, the wall thickness H2 of the battery case 1 refers to the thickness of the bottom wall 11 of the battery case 1. Referring to fig. 4, in the case where the weak portion 21 is a score, a notch, or the like, and is provided on the side of the bottom wall 11 facing away from the battery cell 5, the total depth of the concave portion 111 refers to the distance between the deepest of the score, notch, or the like and the outermost end face of the bottom wall 11. Referring to fig. 2, in the case where the weak portion 21 is thinner than the other locations in the entire pressure relief structure 2, or in the case where the weak portion 21 is a score, a notch, or the like, and is provided on the side of the bottom wall 11 close to the cell 5, the total depth of the concave portion 111 refers to the distance between the side of the pressure relief structure 2 facing away from the cell 5 and the outermost end face of the bottom wall 11.

In some example embodiments of the present disclosure, a face of the pressure relief structure 2 facing away from the accommodating chamber is coplanar with a bottom wall face of the recess 111, or the bottom wall face of the recess 111 protrudes from a face of the pressure relief structure 2 facing away from the accommodating chamber; so that the protective sheet 3 can be attached and fixed to the bottom wall surface of the recess 111.

In the present exemplary embodiment, the ratio of the area of the orthographic projection of the concave portion 111 on the first reference surface to the area of the orthographic projection of the protective sheet 3 on the first reference surface is 0.8 or more, for example, the ratio of the area of the orthographic projection of the concave portion 111 on the first reference surface to the area of the orthographic projection of the protective sheet 3 on the first reference surface may be 1, 1.2, 1.5, 1.7, 2, or the like.

If the ratio of the area of the orthographic projection of the concave portion 111 on the first reference surface to the area of the orthographic projection of the protective sheet 3 on the first reference surface is too large, the width of the gap between the side wall 13 of the concave portion 111 and the side wall 13 of the protective sheet 3 is too large, so that the outside gas and liquid can enter the space between the protective sheet 3 and the pressure release structure 2 through the gap, and the tightness of the battery case 1 is reduced; further, the area of the orthographic projection of the protective sheet 3 on the first reference surface is too small, and the connection area between the protective sheet 3 and the bottom wall 11 of the recess 111 is too small, so that the protective sheet 3 is easily detached.

The above numerical range ensures not only the sealability of the battery case 1 but also the sufficient connection area between the protection sheet 3 and the bottom wall 11 of the recess 111, and the protection sheet 3 is not easily detached.

In the present exemplary embodiment, referring to fig. 2, a pressure release through hole is provided in the battery case 1, a first step 112 is provided on a wall of the pressure release through hole, and a part of the pressure release structure 2 is provided on a step surface of the first step 112. Specifically, a pressure relief through hole is provided in the bottom wall 11, a first step 112 is provided in the wall of the pressure relief through hole, and a part of the outer periphery of the pressure relief structure 2 is provided on the step surface.

So set up for first step 112 and depressed part 111 form two steps, are provided with two steps at the pore wall of pressure release through-hole promptly, have further increased the inside route of external gas and liquid entering battery case 1, make external gas and liquid be difficult to get into inside the battery case 1, have further increased the leakproofness of battery case 1.

It should be noted that, the first step 112 includes two mutually perpendicular surfaces, one surface is substantially parallel to the first reference surface, the other surface is substantially perpendicular to the first reference surface, and the surface parallel to the first reference surface is a step surface.

Moreover, the orthographic projection of the first step 112 on the first reference surface is located within the orthographic projection of the recess 111 on the first reference surface, so that the orthographic projection of the pressure release structure 2 on the first reference surface is located within the orthographic projection of the protective sheet 3 on the first reference surface, so that the protective sheet 3 can cover the pressure release structure 2.

Further, the first step 112 is disposed in the same direction as the recess 111, i.e., a surface of the first step 112 substantially perpendicular to the first reference surface is connected to a bottom wall surface of the recess 111 substantially parallel to the first reference surface. Of course, in other example embodiments of the present disclosure, the first step 112 and the recess 111 may be disposed opposite to each other.

Furthermore, the height of the first step 112 is greater than or equal to the maximum thickness of the pressure relief structure 2, so that the surface of the pressure relief structure 2 facing away from the accommodating cavity is coplanar with the bottom wall surface of the recess 111, or the bottom wall surface of the recess 111 protrudes from the surface of the pressure relief structure 2 facing away from the accommodating cavity.

Referring to fig. 3, in another exemplary embodiment of the present disclosure, a second step 113 is further provided on the wall of the pressure relief through hole, specifically, a second step 113 is further provided on the wall of the pressure relief through hole of the bottom wall 11, and the second step 113 is connected between the first step 112 and the bottom wall surface of the recess 111, so that the wall of the pressure relief through hole is provided with three steps, the outermost is the recess 111, the innermost is the first step 112, and the middle is the second step 113.

A part of the pressure relief structure 2 is provided on the step surface of the second step 113, and may be a circle of the outer periphery of the pressure relief structure 2 is provided on the step surface of the second step 113.

The second step 113 includes two mutually perpendicular surfaces, one of which is substantially parallel to the first reference surface, and the other of which is substantially perpendicular to the first reference surface, and the surface parallel to the first reference surface is a step surface.

The battery may further include a welding portion 7, where the welding portion 7 connects the pressure relief structure 2 with the step surface of the second step 113, that is, a circle of the outer periphery of the pressure relief structure 2 is fixedly connected with the step surface of the second step 113 by welding. The welding process is simple and easy to implement, and the fixing is firm and the air tightness is good, so that the fixing effect of the pressure relief structure 2 is ensured, and the air tightness of the battery shell 1 is ensured.

Moreover, the orthographic projection of the first step 112 on the first reference plane is located within the orthographic projection of the second step 113 on the first reference plane, and the orthographic projection of the second step 113 on the first reference plane is located within the orthographic projection of the recess 111 on the first reference plane, so that the orthographic projection of the pressure release structure 2 on the first reference plane is located within the orthographic projection of the protective sheet 3 on the first reference plane, so that the protective sheet 3 can cover the pressure release structure 2.

Further, the second step 113 is disposed in the same direction as the recess 111 and the first step 112, that is, a surface of the second step 113 substantially perpendicular to the first reference surface is connected to a bottom wall surface of the recess 111 substantially parallel to the first reference surface, and a surface of the first step 112 substantially perpendicular to the first reference surface is connected to a bottom wall surface of the second step 113 substantially parallel to the first reference surface.

Of course, in other example embodiments of the present disclosure, the second step 113 and the first step 112 may be disposed opposite to the recess 111.

Referring to fig. 4, in still another exemplary embodiment of the present disclosure, the pressure relief structure 2 may be formed integrally with the bottom wall 11, that is, the pressure relief structure 2 may be formed with the bottom wall 11 at one time through an integral forming process, for example, may be formed by stamping, where the pressure relief structure 2 and the bottom wall 11 are connected together, and no welding portion 7 or other connecting structure is required.

In this exemplary embodiment, referring to fig. 1 to 5, the battery may further include an adhesive layer 4, where the adhesive layer 4 is adhered to the bottom wall surfaces of the protection sheet 3 and the recess 111, that is, the protection sheet 3 and the bottom wall surface of the recess 111 are fixedly connected by the adhesive layer 4, and the adhesive process is simple and easy to implement, and is relatively firm after being fixed.

Of course, in other exemplary embodiments of the present disclosure, the protection sheet 3 and the bottom wall surface of the recess 111 may be thermally fused, that is, a portion of the outer periphery of the protection sheet 3 is thermally fused and then fixedly connected to the bottom wall surface of the recess 111. The protective sheet 3 and the bottom wall surface of the recess 111 may be connected by screws or the like.

In the present exemplary embodiment, referring to fig. 5 and 6, since the pressure release structure 2 and the air guide groove 1111 are blocked by the protective sheet 3 in fig. 6, the bottom wall 11 of the recess 111 is provided with the air guide groove 1111, indicated by a broken line, and the air guide groove 1111 communicates with the gap between the protective sheet 3 and the pressure release structure 2. The air tightness detection can be performed on the pressure release structure 2 through the air guide groove 1111, and the air guide groove 1111 shortens the distance of the air tightness detection, thereby improving the accuracy of the air tightness detection.

Further, the adhesive layer 4 does not cover at least part of the air guide groove 1111, and for example, the adhesive layer 4 may not cover all of the air guide groove 1111, or the adhesive layer 4 may not cover part of the air guide groove 1111. Since the air guide groove 1111 is to be ventilated for air tightness detection, if the adhesive layer 4 covers the air guide groove 1111, the air guide groove 1111 will be blocked, so that the air guide groove 1111 cannot be ventilated for air tightness detection. Therefore, the adhesive layer 4 does not cover at least part of the air guide groove 1111, so that at least part of the air guide groove 1111 is not blocked by the adhesive layer 4, and air tightness detection can be performed through the air guide groove 1111.

Based on the same inventive concept, the exemplary embodiments of the present disclosure provide a battery device, which may include a battery case 20 and a battery 10, as shown with reference to fig. 7; the battery case 20 may include a bottom plate 201; the battery 10 is any one of the above batteries 10, and the pressure release structure 2 is disposed towards the bottom plate 201, and the specific structure of the battery 10 has been described in detail above, so that details are not repeated here.

The battery device may be provided in a rectangular parallelepiped structure, and therefore, the battery case 20 may be provided in a rectangular parallelepiped structure. Specifically, the battery case 20 may include a chassis 201, a protective cover 203, two first side frames 202, and two second side frames (not shown in the drawings), and the chassis 201 and the protective cover 203 may be provided in a rectangular shape. Two first side frames 202 and two second side frames are arranged around the bottom plate 201, and the two first side frames 202 and the two second side frames are connected end to form a rectangular frame. A protective cover 203 is provided at the other side of the two first side frames 202 and the two second side frames opposite to the bottom plate 201 such that the protective cover 203 is disposed opposite to the bottom plate 201, and the two first side frames 202 and the two second side frames are connected between the protective cover 203 and the bottom plate 201. The bottom plate 201, the protective cover 203, the two first side frames 202, and the two second side frames surround the receiving space formed in the battery case 20.

Of course, in other example embodiments of the present disclosure, the bottom plate 201 and the protective cover 203 may be provided in a circular shape, an oval shape, a trapezoid shape, etc., and the side frames may be provided in one or more and surround to form a circular shape, an oval shape, a trapezoid shape, etc., such that the battery case 20 is formed in a cylindrical shape, an oval cylindrical shape, a prismatic shape, etc. Other shapes of the battery case 20 may be used, and will not be described in detail herein. Further, the battery box 20 may not include the protective cover 203, and for example, in the case where a plurality of battery devices are stacked one above another, the battery device located below may not be provided with the protective cover 203, and only the battery device located uppermost may be provided with the protective cover 203, and the bottom plate 201 of the upper battery device may serve as the protective cover 203 of the lower battery device.

The pressure release structure 2 of the battery 10 is arranged towards the bottom plate 201, so that overheated gas sprayed from the pressure release structure 2 is not sprayed to the adjacent battery 10 and does not affect the adjacent battery 10; in addition, when the battery device is installed, the floor 201 is generally disposed close to the ground so that the floor 201 is further away from the passenger compartment (passenger seating space), and the overheated gas ejected from the pressure release structure 2 is not ejected toward the passenger compartment, and the safety of the passenger is not affected.

The terms "parallel" and "perpendicular" as used in this application may not only be perfectly parallel, perpendicular, but may also have some error; for example, the included angle between the two is greater than or equal to 0 ° and less than or equal to 5 °, i.e. the two are considered to be parallel to each other; the included angle between the two is more than or equal to 85 degrees and less than or equal to 95 degrees, namely the two are considered to be mutually perpendicular.

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 adaptations, 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 (14)

1. A battery, comprising:

the battery shell is provided with a containing cavity, a pressure relief structure and a concave part are arranged on the battery shell, the concave part is arranged on one side, away from the containing cavity, of the battery shell, and the pressure relief structure is arranged on the concave part;

the battery cell is arranged in the accommodating cavity;

the protection piece, at least part of protection piece is located in the depressed part, the pressure release structure is including the weak portion, the orthographic projection of weak portion on first reference surface is located the protection piece is in the orthographic projection on the first reference surface, first reference surface with the battery case sets up the one side of pressure release structure is parallel.

2. The battery of claim 1, wherein a ratio of a total depth of the recess to a wall thickness of the battery case is 0.1 or more and 0.8 or less.

3. The battery according to claim 1, wherein the total depth of the concave portion is 0.2mm or more and 1.2mm or less.

4. The battery of claim 1, wherein a face of the pressure relief structure facing away from the receiving cavity is coplanar with a bottom wall face of the recess, or wherein the bottom wall face of the recess protrudes from a face of the pressure relief structure facing away from the receiving cavity.

5. The battery according to claim 1, wherein a ratio of an area of orthographic projection of the concave portion on the first reference surface to an area of orthographic projection of the protective sheet on the first reference surface is 0.8 or more.

6. The battery according to claim 1, wherein a pressure relief through hole is provided in the battery case, a first step is provided on a wall of the pressure relief through hole, and a part of the pressure relief structure is provided on a step surface of the first step.

7. The battery of claim 6, wherein the height of the first step is equal to or greater than the maximum thickness of the pressure relief structure.

8. The battery of claim 6, wherein the wall of the pressure relief through hole is further provided with a second step, the second step being connected between the first step and the bottom wall surface of the recess, a portion of the pressure relief structure being provided on the step surface of the second step, the battery further comprising:

and the welding part is used for connecting the pressure relief structure with the step surface of the second step.

9. The battery according to any one of claims 1 to 8, characterized in that the battery further comprises:

and an adhesive layer adhered to the bottom wall surfaces of the protective sheet and the recessed portion.

10. The battery according to claim 9, wherein a bottom wall surface of the recess portion is provided with an air guide groove, and the air guide groove is communicated to a gap between the protection sheet and the pressure release structure.

11. The battery of claim 10, wherein a bottom wall of the air guide groove is coplanar with a face of the pressure relief structure facing away from the accommodating cavity, or wherein a bottom wall of the air guide groove protrudes from a face of the pressure relief structure facing away from the accommodating cavity.

12. The battery of claim 10, wherein the adhesive layer does not cover at least a portion of the air guide groove.

13. The battery according to any one of claims 1 to 8, characterized in that the battery further comprises:

and the pole column assembly is connected with the battery shell and is arranged on different walls of the battery shell with the pressure relief structure.

14. A battery device, characterized by comprising:

a battery box including a bottom plate;

a battery as claimed in any one of claims 1 to 13, the pressure relief structure being provided towards the base plate.