CN220553509U - Battery case, battery and battery device - Google Patents

Abstract

The utility model relates to the technical field of batteries, and provides a battery shell, a battery and a battery device. The battery shell comprises a shell body and an explosion-proof structure, at least part of the explosion-proof structure and the shell body are of an integrated structure, the explosion-proof structure comprises a weak part, the outer surface of the shell body provided with the explosion-proof structure is a pressure release surface, a concave part is arranged on the battery shell body, and the concave part is positioned between the outer edge of the pressure release surface and the weak part; the distance between the concave part and the weak part is smaller than the distance between the outer edge of the pressure release surface and the weak part along the direction parallel to the pressure release surface, so that the capacity of the concave part for absorbing stress can be improved, the risk of stress transmission to the edge of the shell is reduced, and the safety use performance of the battery shell is effectively improved.

Description

Battery case, battery and battery device

Technical Field

The present utility model relates to the field of battery technologies, and in particular, to a battery case, a battery, and a battery device.

Background

In the related art, in order to ensure the safe service performance of the battery, an explosion-proof structure is arranged on the battery shell, so that after the internal pressure of the battery reaches a certain height, an explosion-proof section of the explosion-proof structure can be exploded. However, for the explosion-proof structure integrally formed on the battery case, the explosion-proof section is rapidly transferred to the battery case when being stressed, so that the structural damage of the battery case may be caused.

Disclosure of Invention

The utility model provides a battery case, a battery and a battery device, which are used for improving the service performance of the battery case.

According to a first aspect of the utility model, there is provided a battery housing comprising a casing and an explosion-proof structure, the explosion-proof structure and at least part of the casing being of an integrally formed structure, the explosion-proof structure comprising a frangible portion, the casing being provided with an explosion-proof structure, the outer surface of which is a pressure release surface, the battery housing being provided with a recess located between the outer edge of the pressure release surface and the frangible portion;

wherein the distance between the recess and the weak portion is smaller than the distance between the outer edge of the pressure relief surface and the weak portion in a direction parallel to the pressure relief surface.

The battery shell comprises a shell body and an explosion-proof structure, the explosion-proof structure has a safety protection function on the battery, and after the internal pressure of the battery reaches a certain height, the weak part of the explosion-proof structure can be exploded, so that the safety risk is avoided. Through making explosion-proof structure and casing's at least part formula structure as an organic whole, can improve battery case's manufacturing efficiency to a certain extent, and be provided with the concave part on the battery case, the concave part is located between pressure release surface's outward flange and the weak portion, thereby can the concave part can absorb external force when explosion-proof structure atress, the probability that the casing took place the damage has been reduced, and along being on a parallel with pressure release surface's direction, the distance between concave part and the weak portion is less than the distance between pressure release surface's outward flange and the weak portion, thereby can further promote concave part absorption stress's ability, reduce the risk that stress transmitted to the casing edge, thereby effectively promoted battery case's safe performance.

According to a second aspect of the present utility model, there is provided a battery comprising the above battery case and an electric core.

The battery provided by the embodiment of the utility model comprises the battery shell and the battery core, wherein the battery shell comprises the shell and the explosion-proof structure, the explosion-proof structure has a safety protection function on the battery, and after the internal pressure of the battery reaches a certain height, the weak part of the explosion-proof structure can be exploded, so that the safety risk is avoided. Through making explosion-proof structure and casing's at least part formula structure as an organic whole, can improve battery case's manufacturing efficiency to a certain extent, and be provided with the concave part on the battery case, the concave part is located between pressure release surface's outward flange and the weak portion, thereby can the concave part can absorb external force when explosion-proof structure atress, the probability that the casing took place the damage has been reduced, and along being on a parallel with pressure release surface's direction, the distance between concave part and the weak portion is less than the distance between pressure release surface's outward flange and the weak portion, thereby can further promote concave part absorption stress's ability, reduce the risk that stress transmitted to the casing edge, thereby effectively promoted battery's safe performance.

According to a third aspect of the present utility model, there is provided a battery device including the above battery and a base plate, the battery being disposed on the base plate.

The battery device comprises a battery and a bottom plate, wherein a battery shell comprises a shell body and an explosion-proof structure, the explosion-proof structure plays a role in protecting the battery, and after the internal pressure of the battery reaches a certain height, a weak part of the explosion-proof structure can be exploded, so that the safety risk is avoided. Through making explosion-proof structure and casing's at least part formula structure as an organic whole, can improve battery case's manufacturing efficiency to a certain extent, and be provided with the concave part on the battery case, the concave part is located between pressure release surface's outward flange and the weak portion, thereby can the concave part can absorb external force when explosion-proof structure atress, the probability that the casing took place the damage has been reduced, and along being on a parallel with pressure release surface's direction, the distance between concave part and the weak portion is less than the distance between pressure release surface's outward flange and the weak portion, thereby can further promote concave part absorption stress's ability, reduce the risk that stress transmitted to the casing edge, thereby effectively promoted battery device's safe performance.

Drawings

For a better understanding of the present disclosure, reference may be made to the embodiments illustrated in the following drawings. The components in the drawings are not necessarily to scale and related elements may be omitted in order to emphasize and clearly illustrate the technical features of the present disclosure. In addition, the relevant elements or components may have different arrangements as known in the art. Furthermore, in the drawings, like reference numerals designate identical or similar parts throughout the several views. Wherein:

fig. 1 is a schematic view showing a structure of a battery according to an exemplary embodiment;

fig. 2 is a schematic view of a structure of a battery according to another exemplary embodiment;

fig. 3 is a schematic view showing a partial sectional structure of a battery according to an exemplary embodiment;

fig. 4 is a schematic structural view of a battery device according to an exemplary embodiment.

The reference numerals are explained as follows:

10. a housing; 11. a pressure relief surface; 12. a housing member; 121. a sidewall portion; 122. a bottom wall portion; 13. a cover plate; 20. an explosion-proof structure; 21. a first body; 22. a second body; 23. a weak portion; 30. a concave portion; 40. a pole assembly; 50. a bottom plate; 51. and a pressure release channel.

Detailed Description

The technical solutions in the exemplary embodiments of the present disclosure will be clearly and completely described below with reference to the accompanying drawings in the exemplary embodiments of the present disclosure. The example embodiments described herein are for illustrative purposes only and are not intended to limit the scope of the present disclosure, and it is therefore to be understood that various modifications and changes may be made to the example embodiments without departing from the scope of the present disclosure.

In the description of the present disclosure, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying relative importance unless explicitly specified or limited otherwise; the term "plurality" refers to two or more than two; the term "and/or" includes any and all combinations of one or more of the associated listed items. In particular, references to "the/the" object or "an" object are likewise intended to mean one of a possible plurality of such objects.

Unless specified or indicated otherwise, the terms "connected," "fixed," and the like are to be construed broadly and are, for example, capable of being fixedly connected, detachably connected, or integrally connected, electrically connected, or signally connected; "coupled" may be directly coupled or indirectly coupled through intermediaries. The specific meaning of the terms in the present disclosure may be understood by those skilled in the art according to the specific circumstances.

Further, in the description of the present disclosure, it should be understood that the terms "upper", "lower", "inner", "outer", and the like, as described in the example embodiments of the present disclosure, are described with the angles shown in the drawings, and should not be construed as limiting the example embodiments of the present disclosure. It will also be understood that in the context of an element or feature being connected to another element(s) "upper," "lower," or "inner," "outer," it can be directly connected to the other element(s) "upper," "lower," or "inner," "outer," or indirectly connected to the other element(s) "upper," "lower," or "inner," "outer" via intervening elements.

Referring to fig. 1 to 3, a battery case is provided in an embodiment of the present utility model, the battery includes a case 10 and an explosion-proof structure 20, the explosion-proof structure 20 and at least part of the case 10 are integrally formed, the explosion-proof structure 20 includes a weak portion 23, an outer surface of the case 10 provided with the explosion-proof structure 20 is a pressure release surface 11, a recess 30 is provided on the battery case, and the recess 30 is located between an outer edge of the pressure release surface 11 and the weak portion 23; wherein the distance between the recess 30 and the weakening portion 23 is smaller than the distance between the outer edge of the pressure relief surface 11 and the weakening portion 23 in a direction parallel to the pressure relief surface 11.

The battery case of one embodiment of the present utility model includes a case 10 and an explosion-proof structure 20, the explosion-proof structure 20 forming a safety protection function for the battery, and a weak portion 23 of the explosion-proof structure 20 being exploded after the internal pressure of the battery reaches a certain height, thereby avoiding the occurrence of safety risks. By making the explosion-proof structure 20 and at least part of the casing 10 be an integral structure, the manufacturing efficiency of the battery casing can be improved to a certain extent, and the battery casing is provided with the concave part 30, and the concave part 30 is positioned between the outer edge of the pressure release surface 11 and the weak part 23, so that the concave part 30 can absorb external force when the explosion-proof structure 20 is stressed, the damage probability of the casing 10 is reduced, and in the direction parallel to the pressure release surface 11, the distance between the concave part 30 and the weak part 23 is smaller than the distance between the outer edge of the pressure release surface 11 and the weak part 23, thereby further improving the capability of the concave part 30 for absorbing stress, reducing the risk of the stress being transmitted to the edge of the casing 10, and effectively improving the safety use performance of the battery casing.

It should be noted that, at least part of the explosion-proof structure 20 and the housing 10 are integrally formed, that is, the explosion-proof structure 20 may be integrally formed on the housing 10, and the materials of the explosion-proof structure 20 and the housing 10 may be consistent, for example, the housing 10 may be made of copper, aluminum, steel or metal composite materials. The integrally formed structure specifically means that the explosion-proof structure 20 is directly processed on the housing 10, and the weak portion 23 can be formed by thinning by etching, stamping, stretching or cutting, etc., unlike the related art in which an explosion-proof sheet is separately provided on the housing.

At least part of the explosion-proof structure 20 and the shell 10 are of an integrally formed structure, and the explosion-proof structure 20 is easier to transfer to the shell 10 after being stressed, so that the probability of damage to the shell 10 is increased, and particularly the joint of the transition region of the shell 10 is increased.

By providing the recess 30 in the battery housing and the recess 30 being located between the outer edge of the pressure relief surface 11 and the frangible portion 23, i.e. the recess 30 can absorb the stress induced by the burst structure 20, the probability of stress transfer to the outer edge of the pressure relief surface 11 is reduced, and to a certain extent the probability of damage occurring at the junction of the transition area of the housing 10 is reduced. And along the direction parallel to the pressure release surface 11, the distance between the concave part 30 and the weak part 23 is smaller than the distance between the outer edge of the pressure release surface 11 and the weak part 23, namely, the concave part 30 is closer to the weak part 23, so that the concave part 30 can absorb stress in time, the risk that the stress of the weak part 23 is transferred to the outer edge of the pressure release surface 11 is reduced, and the probability of damage to the battery case can be effectively reduced. The recess 30 provides cushioning between the outer edge of the pressure relief surface 11 and the explosion proof structure 20, e.g. the recess 30 may prevent deformation of the housing 10 from being transferred directly to the explosion proof structure 20.

As shown in connection with fig. 1 and 2, the direction parallel to the pressure release surface 11 may be regarded as the length direction of the battery case, or the direction parallel to the pressure release surface 11 may be regarded as the width direction of the battery case.

As shown in connection with fig. 3, the distance between the recess 30 and the weak portion 23 may be denoted as a and the distance between the outer edge of the pressure relief surface 11 and the weak portion 23 may be denoted as b.

The weak portion 23 is the weakest area of the explosion-proof structure 20 and is used for realizing the pressure relief of the battery, and after the internal pressure of the battery reaches a certain height, the weak portion 23 is broken through to realize the rapid pressure relief.

The recess 30 may be deformed to achieve stress absorption, for example, the recess 30 may be a bent structure; alternatively, the concave portion 30 may be a suction space, so that the absorption of stress may be achieved by the concave portion 30, and the specific structural form of the concave portion 30 is not limited herein, as long as the absorption of stress can be formed.

In one embodiment, as shown in fig. 3, the explosion-proof structure 20 further includes a first body 21 and a second body 22, the second body 22 being connected to the case 10, the weak portion 23 being located between the first body 21 and the second body 22; wherein the recess 30 is located on at least one of the housing 10 and the second body 22, so that the recess 30 can be ensured to be capable of effectively forming an absorption of stress, reducing the transmission of stress, and forming an effective protection of the housing 10.

The recess 30 may be formed in the housing 10, and in this case, the recess 30 provides effective absorption of force during the transfer of force from the burst-resistant structure 20 to the outer edge of the housing 10, reducing the probability of stress being transferred to the outer edge of the pressure relief surface 11, and thus protecting the housing 10.

A recess 30 may be formed in the second body 22, in which case the force received by the vent structure 20 may be absorbed by the recess 30, thereby reducing the chance of transmission to the outer edge of the pressure relief surface 11.

The recess 30 may be formed on both the housing 10 and the second body 22 to achieve efficient absorption of force and reduce the chance of damaging the housing 10.

The second body 22 is connected to the case 10, the weak portion 23 is located between the first body 21 and the second body 22, and after the weak portion 23 is broken, the first body 21 is used to release the gas, thereby achieving rapid pressure release of the gas.

The weak portion 23 may be a relatively low-strength structure, and the explosion-proof structure 20 may be partially thinned, thereby forming the weak portion 23, and for example, the weak portion 23 may be a thin aluminum plate, a copper plate, a steel plate, a nickel plate, or the like; alternatively, the weakened portion 23 may be a structure formed by itself having weak material strength, which is not limited herein.

In one embodiment, the weak portion 23 is formed by a score, i.e., a score is formed between the first body 21 and the second body 22, so that the structure between the first body 21 and the second body 22 is thinned, thereby forming the weak portion 23, as shown in fig. 3.

The score may be formed by material removal, for example, by machining, or by laser etching, etc.; the score may also be formed by stamping, i.e. the material between the first body 21 and the second body 22 is thinned by stamping, thereby forming the weakened portion 23.

In one embodiment, the second body 22 is stamped or extruded, which not only improves the molding efficiency of the explosion-proof structure 20, but also supplements the excessive material to the housing 10 during the process of forming the second body 22, thereby increasing the structural strength of the housing 10 and avoiding the problem of material waste.

For example, the second body 22 is formed by stamping, that is, the original flat plate is locally thinned by stamping, as shown in fig. 3, the second body 22 may be formed into a variable thickness structure, or the second body 22 may be formed into an equal thickness structure, and the thickness of the second body 22 may be smaller than that of the housing 10; of course, it is not excluded that the thickness of the structure formed by the second body 22 may be thicker than the housing 10.

In one embodiment, the wall thickness ratio of the weak portion 23 to the second main body 22 is less than or equal to 0.5, so that the weak portion 23 can be effectively ensured to be exploded under a certain pressure, the safety performance of the battery is improved, and the second main body 22 can form reinforcement on the explosion-proof structure 20, so that the explosion-proof structure 20 has higher structural stability, the weak portion 23 can be accurately exploded, the probability of false explosion of the weak portion 23 is reduced, and the safety protection performance of the explosion-proof structure 20 can be effectively improved.

The ratio of the wall thickness of the weakened portion 23 to the second body 22 may be 0.5, 0.45, 0.4 or 0.35, etc.

The wall thickness of the second body 22 is the cross-sectional thickness of the second body 22 after being cut in a direction perpendicular to the pressure release surface 11, for example, when the second body 22 is of a variable thickness structure, the wall thickness of the second body 22 can be regarded as the minimum wall thickness of the second body 22.

In one embodiment, the ratio of the wall thickness of the first body 21 to the wall thickness of the second body 22 is 0.7-1.4, so that the wall thickness of the first body 21 and the wall thickness of the second body 22 can be effectively controlled, and an excessive difference between the wall thickness of the first body 21 and the wall thickness of the second body 22 is avoided, thereby facilitating molding.

The ratio of the wall thickness of the first body 21 to the wall thickness of the second body 22 may be 0.7, 0.8, 0.9, 1, 1.1, 1.2, 1.3 or 1.4, etc.

In one embodiment, the wall thickness of the surface of the housing 10 provided with the explosion-proof structure 20 is greater than or equal to 0.5mm, so that the housing 10 can be ensured to have proper structural strength, and the safety risk of the housing 10 caused by insufficient strength is avoided.

The wall thickness of the surface of the housing 10 provided with the explosion proof structure 20 may be 0.5mm, 0.8mm, 1mm, 1.2mm, 1.5mm, 1.8mm or 2mm etc.

The wall thickness of the surface of the housing 10 provided with the explosion-proof structure 20 is the thickness of the section of the housing 10 cut along the direction perpendicular to the pressure release surface 11, and the wall thickness of the housing 10 provided with the explosion-proof structure 20 is the thickness limit of the housing 10 with the pressure release surface 11. Here, the wall thickness of the case 10 provided with the explosion-proof structure 20 means the thickness of the case 10 itself, for example, the recess 30 is a groove, and the recess 30 is provided on the case 10, and in this case, the wall thickness of the recess 30 is not the wall thickness of the case 10 provided with the explosion-proof structure 20.

In one embodiment, the recess 30 is located on the case 10, so that the stress absorbing capability of the recess 30 can be ensured, reducing the risk of the force at the explosion-proof structure 20 being transmitted to the outer edge of the case 10, thereby reliably improving the structural strength of the battery case.

In one embodiment, the battery housing is a quadrangular battery housing.

The embodiment of the utility model also provides a battery, which comprises the battery shell and a battery core, wherein the battery core is arranged in the battery shell.

The battery according to one embodiment of the utility model comprises a battery shell and an electric core arranged in the battery shell, wherein the battery shell comprises a shell 10 and an explosion-proof structure 20, the explosion-proof structure 20 forms a safety protection function for the battery, and after the internal pressure of the battery reaches a certain height, the weak part 23 of the explosion-proof structure 20 can be exploded, so that the safety risk is avoided. By making the explosion-proof structure 20 and at least part of the casing 10 be an integral structure, the manufacturing efficiency of the battery casing can be improved to a certain extent, and the battery casing is provided with the concave part 30, and the concave part 30 is positioned between the outer edge of the pressure release surface 11 and the weak part 23, so that the concave part 30 can absorb external force when the explosion-proof structure 20 is stressed, the damage probability of the casing 10 is reduced, and in the direction parallel to the pressure release surface 11, the distance between the concave part 30 and the weak part 23 is smaller than the distance between the outer edge of the pressure release surface 11 and the weak part 23, thereby further improving the capability of the concave part 30 for absorbing stress, reducing the risk of the stress being transmitted to the edge of the casing 10, and effectively improving the safe service performance of the battery.

It should be noted that the recess 30 may have an opening, for example, the recess 30 is a groove, so that the groove may be made as a force absorbing space, the stress absorbing capacity is improved, thereby improving the protection capacity of the battery case, and the overall weight of the battery case may be reduced to some extent, thereby improving the energy density of the battery.

In one embodiment, the opening of the recess 30 is located away from the cell, i.e. the recess 30 may be located on the outer surface of the battery housing, to some extent facilitating the location of the recess 30.

In one embodiment, the opening of the recess 30 is disposed toward the battery cell, that is, the recess 30 may be disposed on the inner surface of the battery case, so that not only the problem of the battery case being rugged can be avoided, but also the space inside the battery case can be increased, thereby improving the gas storage capacity and, to some extent, improving the usability of the battery case.

In one embodiment, the ratio of the thickness of the bottom wall of the recess 30 to the wall thickness of the surface of the housing 10 on which the explosion-proof structure 20 is provided is 0.2-0.8, so as to effectively control the bottom wall strength of the recess, and also ensure that the recess can have a certain depth and ensure the absorbing capability of stress.

The ratio of the bottom wall thickness of the recess 30 to the wall thickness of the surface of the housing 10 on which the explosion-proof structure 20 is provided may be 0.2, 0.25, 0.3, 0.35, 0.4, 0.45, 0.5, 0.55, 0.6, 0.65, 0.7, 0.75, or 0.8, etc.

The bottom wall thickness of the concave portion 30 is the thickness of the bottom wall of the groove, and the cut section thickness is the thickness of the bottom wall of the groove when the area where the groove is cut along the direction perpendicular to the pressure release surface 11.

In one embodiment, the thickness of the bottom wall of the recess 30 is greater than the minimum thickness of the explosion-proof structure 20, so that false explosion of the bottom wall of the recess 30 can be avoided, and the safety protection capability of the explosion-proof structure 20 is reduced, which may affect the normal use of the battery.

In one embodiment, the width of the recess 30 is the dimension of the recess 30 along the arrangement direction of the recess 30 and the weak portion 23, and the ratio of the wall thickness of the surface of the case 10 provided with the explosion-proof structure 20 to the width of the recess 30 is less than or equal to 3, so that not only can the recess 30 have a reliable buffering capacity, but also the formation of the explosion-proof structure 20 is facilitated, and the overall structural strength of the battery case can be ensured.

When the ratio of the wall thickness of the surface of the casing 10 provided with the explosion-proof structure 20 to the width of the concave part 30 is too large, the concave part 30 may not be able to buffer the casing 10, the molding difficulty of the integrated explosion-proof structure 20 is improved, and the overall energy density of the battery is low; when the wall thickness of the surface of the casing 10 provided with the explosion-proof structure 20 is smaller than the width of the concave part 30, the overall strength of the casing 10 is lower, the concave part 30 occupies a larger space of the battery, the overall strength of the battery is reduced, and the flatness of the surface of the casing 10 is lower, so that the assembly of the subsequent battery pack is affected.

As shown in connection with fig. 3, the wall thickness of the surface of the case 10 provided with the explosion-proof structure 20 may be denoted as c, and the width of the recess 30 may be denoted as d along the arrangement direction of the recess 30 and the weak portion 23, and the ratio of the wall thickness c of the surface of the case 10 provided with the explosion-proof structure 20 to the width d of the recess 30 may be 3, 2.9, 2.8, 2.5, 2.4, 2.2, 2, 1.9, 1.8, or 1.5, etc.

In one embodiment, the distance between the concave portion 30 and the weak portion 23 is less than or equal to 50mm, so that the concave portion 30 can absorb stress in time, the probability of transmitting the stress to the outer edge of the shell 10 is reduced, and the safety use performance of the battery shell is effectively improved.

The distance between the recess 30 and the weakening 23 may be 50mm, 48mm, 45mm, 43mm, 40mm, 38mm, 35mm, 33mm or 20mm etc.

In one embodiment, the recess 30 is disposed around the weak portion 23, and the recess 30 is of a circumferentially closed structure, so that the recess 30 can form a complete surrounding of the weak portion 23, and the integral absorption of the stress transmission of the first main body 21 is achieved, thereby effectively reducing the capability of the stress transmission, and improving the safety performance of the battery case.

The recess 30 may be a groove and the recess may be provided around the frangible portion 23. For example, the cross-sectional shape of the groove may be rectangular, or the cross-sectional shape of the groove may be U-shaped, or the like.

In one embodiment, as shown in fig. 1, the casing 10 includes a casing member 12 and a cover plate 13, and the explosion-proof structure 20 is integrally formed on the cover plate 13, so that when the explosion-proof structure 20 is stressed, if the force applied to the explosion-proof structure 20 is transmitted to the connection position between the casing member 12 and the cover plate 13, the connection position between the casing member 12 and the cover plate 13 is easily broken, thereby being unfavorable for improving the safety performance of the battery, and effectively reducing the connection failure problem of the casing member 12 and the cover plate 13 through the arrangement of the concave portion 30.

Wherein, the cover plate 13 is welded with the shell 12, which not only ensures the connection efficiency of the cover plate 13 and the shell 12 and improves the connection strength of the cover plate 13 and the shell 12, but also improves the sealing performance of the cover plate 13 and the shell 12. The cover plate 13 may be provided with a post assembly 40.

The cover 13 and the housing member 12 may be laser welded, resistance welded, ultrasonic welded, or the like, which is not limited herein.

In one embodiment, as shown in fig. 2, the casing 10 includes a casing member 12 and a cover plate 13, and the explosion-proof structure 20 is integrally formed on the casing member 12, so that on the basis of ensuring the forming efficiency of the battery casing, the structural influence on the casing member 12 after the explosion-proof structure 20 is stressed can be effectively reduced, thereby ensuring the structural strength of the casing member 12.

Wherein, the cover plate 13 is welded with the shell 12, and the connection strength of the cover plate 13 and the shell 12 can be effectively improved on the basis of ensuring the manufacturing efficiency.

In one embodiment, as shown in fig. 2, the housing member 12 includes a side wall portion 121 and a bottom wall portion 122, the side wall portion 121 and the bottom wall portion 122 are integrally formed, the cover 13 is welded to the side wall portion 121, and the cover 13 is disposed opposite to the bottom wall portion 122, so that a seal for the battery case can be formed after the cover 13 is welded to the side wall portion 121, and the safe usability of the battery is ensured

The side wall portion 121 and the bottom wall portion 122 are integrally formed, which not only improves the molding efficiency of the case member 12, but also reduces the welded joint of the battery case, reduces the risk of failure in the battery case connection to some extent, and improves the molding efficiency of the battery case.

The explosion proof structure 20 may be integrally formed on the sidewall portion 121, for example, the explosion proof structure 20 may be integrally formed on a small surface of the sidewall portion 121.

Alternatively, as shown in fig. 2, the explosion-proof structure 20 is integrally formed on the bottom wall portion 122, and the bottom wall portion 122 may be further provided with the post assembly 40, thereby improving the space utilization of the battery case.

In one embodiment, the ratio of the wall thickness of the side wall portion 121 to the wall thickness of the bottom wall portion 122 is not less than 0.3, whereby it is possible to reliably ensure that the housing member 12 can have a reliable structural strength, and to avoid an excessively large difference in the wall thickness of the side wall portion 121 from the wall thickness of the bottom wall portion 122.

In one embodiment, the wall thickness of the side wall portion 121 is smaller than the wall thickness of the bottom wall portion 122, so that the bottom wall portion 122 can have a certain structural strength, and a reliable support for the explosion-proof structure 20 is formed, so that structural damage is avoided, and the safety use performance of the battery case is improved.

The ratio of the wall thickness of the side wall portion 121 to the wall thickness of the bottom wall portion 122 may be 0.3, 0.35, 0.4, 0.45, 0.5, 0.55, 0.6, 0.65, 0.7, 0.75, or 0.8, etc.

The battery includes a cell and an electrolyte, and is a minimum unit capable of performing an electrochemical reaction such as charge/discharge. The battery cell refers to a unit formed by winding or laminating a stacked portion, wherein the stacked portion comprises a first pole piece, a separator and a second pole piece. When the first pole piece is a positive pole piece, the second pole piece is a negative pole piece. Wherein the polarities of the first pole piece and the second pole piece can be interchanged. The first and second pole pieces are coated with an active substance.

In one embodiment, the battery may be a quadrangular prism type battery, and the quadrangular prism type battery mainly refers to a prism shape, but whether each side of the prism is a straight line in a strict sense is not strictly limited, and corners between sides are not necessarily right angles, and may be arc transition.

The battery can be a laminated battery, so that the battery is not only convenient to group, but also long in length. Specifically, the battery cell is a laminated battery cell, and the battery cell is provided with a first pole piece, a second pole piece opposite to the first pole piece and a diaphragm sheet arranged between the first pole piece and the second pole piece, which are mutually laminated, so that a plurality of pairs of the first pole piece and the second pole piece are stacked to form the laminated battery cell.

Alternatively, the battery may be a wound battery in which a first pole piece, a second pole piece opposite in electrical property to the first pole piece, and a separator sheet disposed between the first pole piece and the second pole piece are wound to obtain a wound battery cell.

In one embodiment, the battery may be a cylindrical battery, or the battery may be a hexagonal-prism-type battery. The battery can be a winding type battery, namely, a first pole piece, a second pole piece opposite to the first pole piece and a diaphragm sheet arranged between the first pole piece and the second pole piece are wound to obtain a winding type battery cell.

An embodiment of the present utility model further provides a battery device, including the battery and the bottom plate 50, where the battery is disposed on the bottom plate 50.

The battery device according to an embodiment of the present utility model includes a battery and a bottom plate 50, the battery is disposed on the bottom plate 50, a battery case of the battery includes a case 10 and an explosion-proof structure 20, the explosion-proof structure 20 forms a safety protection function for the battery, and after the internal pressure of the battery reaches a certain height, a weak portion 23 of the explosion-proof structure 20 can be exploded, thereby avoiding the initiation of safety risks. By making the explosion-proof structure 20 and at least part of the casing 10 be an integral structure, the manufacturing efficiency of the battery casing can be improved to a certain extent, and the battery casing is provided with the concave part 30, and the concave part 30 is positioned between the outer edge of the pressure release surface 11 and the weak part 23, so that the concave part 30 can absorb external force when the explosion-proof structure 20 is stressed, the damage probability of the casing 10 is reduced, and in the direction parallel to the pressure release surface 11, the distance between the concave part 30 and the weak part 23 is smaller than the distance between the outer edge of the pressure release surface 11 and the weak part 23, thereby further improving the capability of the concave part 30 for absorbing stress, reducing the risk of the stress being transmitted to the edge of the casing 10, and effectively improving the safety use performance of the battery device.

In one embodiment, the explosion-proof structure 20 is disposed toward the floor 50 such that the explosion-proof structure 20 is disposed opposite the floor 50, so that heat impact to the passenger compartment can be avoided and the safety of the driver can be improved when the battery pack is used in a vehicle and the battery is thermally out of control.

In one embodiment, as shown in fig. 4, the bottom plate 50 is provided with a pressure relief channel 51, so that after the explosion-proof structure 20 is exploded, the gas discharged from the battery enters the pressure relief channel 51, thereby realizing rapid gas discharge and avoiding the problem of thermal runaway.

The bottom plate 50 may be provided with a through hole or the bottom plate 50 may be provided with a weak structure, and the explosion-proof structure 20 may be directed toward the through hole or the weak structure. For example, the bottom panel 50 may be provided with a frangible structure such that after the burst structure 20 is burst, gas may rupture the frangible structure into the pressure relief channel 51. The relief channel 51 may be a cavity structure of the bottom plate 50.

It should be noted that the battery device may be a battery module, a battery pack, or an electric vehicle, an airplane, a ship, an energy storage device, or the like that is loaded with a battery.

Other embodiments of the disclosure will be apparent to those skilled in the art from consideration of the specification and practice of the utility model disclosed herein. This disclosure is intended to cover any variations, uses, or adaptations of the utility model 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. The specification and example embodiments are to be considered exemplary only, with a true scope and spirit of the disclosure being indicated by the following claims.

It is to be understood that the present disclosure is not limited to the precise arrangements and instrumentalities shown in the drawings, and that various modifications and changes may be effected without departing from the scope thereof. The scope of the present disclosure is limited only by the appended claims.

Claims (23)

1. The battery shell is characterized by comprising a shell body (10) and an explosion-proof structure (20), wherein the explosion-proof structure (20) and at least part of the shell body (10) are integrally formed, the explosion-proof structure (20) comprises a weak part (23), the outer surface of the shell body (10) provided with the explosion-proof structure (20) is a pressure release surface (11), a concave part (30) is arranged on the battery shell, and the concave part (30) is positioned between the outer edge of the pressure release surface (11) and the weak part (23);

wherein the distance between the recess (30) and the weakening (23) is smaller than the distance between the outer edge of the pressure relief surface (11) and the weakening (23) in a direction parallel to the pressure relief surface (11).

2. The battery housing according to claim 1, wherein the explosion-proof structure (20) further comprises a first body (21) and a second body (22), the second body (22) being connected to the casing (10), the weak portion (23) being located between the first body (21) and the second body (22);

wherein the recess (30) is located on at least one of the housing (10) and the second body (22).

3. Battery housing according to claim 2, characterized in that the second body (22) is stamped or extruded.

4. The battery housing according to claim 2, characterized in that the ratio of the wall thickness of the weakened portion (23) to the second body (22) is equal to or less than 0.5.

5. Battery housing according to claim 2, characterized in that the ratio of the wall thickness of the first body (21) to the wall thickness of the second body (22) is 0.7-1.4.

6. The battery housing according to any one of claims 1 to 5, characterized in that the wall thickness of the surface of the housing (10) provided with the explosion-proof structure (20) is ≡0.5mm.

7. The battery case according to any one of claims 1 to 5, wherein the weak portion (23) is formed by a score.

8. A battery comprising the battery housing of any one of claims 1 to 7 and a cell disposed within the battery housing.

9. The battery according to claim 8, characterized in that the opening of the recess (30) is arranged away from the cell or the opening of the recess (30) is arranged towards the cell.

10. The battery according to claim 8, characterized in that the ratio of the thickness of the bottom wall of the recess (30) to the wall thickness of the surface of the housing (10) provided with the explosion-proof structure (20) is 0.2-0.8.

11. The battery according to claim 8, characterized in that the bottom wall thickness of the recess (30) is greater than the minimum thickness of the explosion-proof structure (20).

12. The battery according to claim 8, wherein a ratio of a wall thickness of a surface of the case (10) provided with the explosion-proof structure (20) to a width of the recess (30) is equal to or less than 3, the width of the recess (30) being a dimension of the recess (30) in an arrangement direction of the recess (30) and the weak portion (23).

13. The battery according to claim 8, characterized in that the distance between the recess (30) and the weak portion (23) is less than or equal to 50mm.

14. The battery according to claim 8, wherein the recess (30) is provided around the weak portion (23), the recess (30) being of a circumferentially closed structure.

15. The battery according to claim 8, wherein the housing (10) comprises a housing part (12) and a cover plate (13), the explosion-proof structure (20) being integrally formed on the cover plate (13);

wherein the cover plate (13) is welded to the housing part (12).

16. The battery according to claim 8, wherein the housing (10) comprises a housing member (12) and a cover plate (13), the explosion-proof structure (20) being integrally formed on the housing member (12);

wherein the cover plate (13) is welded to the housing part (12).

17. The battery according to claim 16, wherein the case member (12) includes a side wall portion (121) and a bottom wall portion (122), the side wall portion (121) and the bottom wall portion (122) being of an integrally formed type structure, the cover plate (13) being welded to the side wall portion (121), and the cover plate (13) being disposed opposite to the bottom wall portion (122);

wherein the explosion-proof structure (20) is integrally formed on the side wall portion (121), or the explosion-proof structure (20) is integrally formed on the bottom wall portion (122).

18. The battery according to claim 17, characterized in that the ratio of the wall thickness of the side wall portion (121) to the wall thickness of the bottom wall portion (122) is not less than 0.3.

19. The battery according to claim 18, wherein the wall thickness of the side wall portion (121) is smaller than the wall thickness of the bottom wall portion (122).

20. The battery of claim 8, wherein the battery is a quadrangular battery.

21. A battery device comprising the battery of any one of claims 8 to 20 and a base plate (50), the battery being provided on the base plate (50).

22. The battery device according to claim 21, wherein the explosion-proof structure (20) is disposed toward the bottom plate (50) such that the explosion-proof structure (20) is disposed opposite the bottom plate (50).

23. Battery device according to claim 22, characterized in that the bottom plate (50) is provided with a pressure relief channel (51).