CN216872185U - Battery explosion-proof structure, battery shell and battery - Google Patents

Abstract

The utility model provides a battery explosion-proof structure, a battery shell and a battery, wherein the battery explosion-proof structure comprises an explosion-proof sheet, and the explosion-proof sheet is provided with a first surface and a second surface which are oppositely arranged along the thickness direction; the first surface is provided with at least one first explosion-proof groove which does not penetrate through the explosion-proof sheet, and the first explosion-proof groove forms a first explosion area on the first surface; the second surface is provided with at least one second explosion-proof groove which does not penetrate through the explosion-proof sheet, and the second explosion-proof groove forms a second explosion area on the second surface; and a reinforcing structure is arranged on the first blasting area and/or the second blasting area. The explosion-proof grooves are formed in the surfaces of the two sides of the explosion-proof sheet, so that the explosion-proof sheet has the advantages of high machining forming rate, high explosion point precision, stability and reliability and the like. The battery shell with the battery presses when too big when in the battery through using aforementioned battery explosion-proof structure, can play the pressure release effect, prevents that thermal runaway from appearing in the battery, has improved the safety in utilization of battery shell and battery.

Description

Battery explosion-proof structure, battery shell and battery

Technical Field

The utility model relates to the technical field of batteries, in particular to a battery explosion-proof structure, a battery shell and a battery.

Background

The lithium battery has the advantages of high energy density, long service life and the like, and is widely applied to electric automobiles, standby power supply systems and micro-grid energy storage systems. The power lithium battery comprises a roll core, electrolyte, a shell, a cover plate and other structures. In terms of the structural design of the battery, in order to improve the safety performance of the battery, an explosion-proof mechanism is generally added on a battery cover plate. The battery is decompressed through the explosion-proof mechanism when the battery is in the abnormal state thermal runaway, and the thermal runaway risk of the battery is prevented.

In most of the explosion-proof mechanisms in the prior art, a nick is arranged on one side to form an explosion area. When the pressure in the battery is larger than the set value of the explosion-proof mechanism, the explosion area can be broken, and then the battery is decompressed. When the metal with lower hardness and better ductility is processed, the nicks are easily processed to the specified depth in a mode of arranging the nicks on one side, and the precision of the nick depth can be ensured. In the actual use process, a mathematical relation exists between the notch setting depth and the blasting pressure, the blasting pressure can be determined according to the notch depth, and the accurate blasting is performed when the pressure reaches a set value, so that the anti-explosion mechanism with a stable explosion point is obtained.

However, when processing a metal with high hardness and poor ductility, the machining process of the single-side notch is very difficult, the machining quality of the single-side notch is difficult to ensure, the specified depth is difficult to precisely machine, and the stability of the opening pressure of the explosion-proof mechanism cannot be ensured.

SUMMERY OF THE UTILITY MODEL

In order to overcome the above defects in the prior art, embodiments of the present invention provide a battery explosion-proof structure, a battery case and a battery, in which explosion-proof grooves are simultaneously formed on both side surfaces of an explosion-proof sheet, so that the battery explosion-proof structure has the advantages of high forming rate, high explosion point precision, stability and reliability, and the like.

The above object of the present invention can be achieved by the following technical solutions, in which the present invention provides a battery explosion-proof structure including an explosion-proof sheet having a first surface and a second surface oppositely disposed along a thickness direction;

the first surface is provided with at least one first explosion-proof groove which does not penetrate through the explosion-proof sheet, and the first explosion-proof groove forms a first explosion area on the first surface;

the second surface is provided with at least one second explosion-proof groove which does not penetrate through the explosion-proof sheet, and the second explosion-proof groove forms a second explosion area on the second surface;

and a reinforcing structure is arranged on the first blasting area and/or the second blasting area.

In a preferred embodiment of the present invention, the first explosion-proof groove has a first bottom end, the second explosion-proof groove has a second bottom end, and the first bottom end and the second bottom end are staggered in the thickness direction of the explosion-proof sheet.

In a preferred embodiment of the present invention, in a thickness direction of the rupture disk, a minimum thickness of the first bottom end from the second surface or the side wall of the second rupture groove is a first thickness, and a minimum thickness of the second bottom end from the first surface or the side wall of the first rupture groove is a second thickness;

the minimum thickness between the first explosion-proof groove and the second explosion-proof groove is a third thickness, and the third thickness is smaller than the first thickness and the second thickness.

In a preferred embodiment of the present invention, at least a portion of the first explosion-proof groove and the second explosion-proof groove are disposed at the same height.

In a preferred embodiment of the present invention, the first explosion-proof groove and the second explosion-proof groove are concentrically arranged on two opposite side surfaces of the explosion-proof sheet.

In a preferred embodiment of the present invention, the first explosion-proof groove and the second explosion-proof groove are symmetrically disposed on opposite side surfaces of the explosion-proof plate.

In a preferred embodiment of the present invention, the first blasting region and/or the second blasting region are thinned, and the thinned depth of the blasting region is smaller than the set depth of the corresponding explosion-proof slot.

In a preferred embodiment of the present invention, a cross-sectional shape of the first explosion-proof groove is the same as a cross-sectional shape of the second explosion-proof groove.

In a preferred embodiment of the present invention, a cross-sectional shape of the first explosion-proof groove is different from a cross-sectional shape of the second explosion-proof groove.

In a preferred embodiment of the utility model, the reinforcing structure comprises at least one reinforcing bead arranged on the first burst zone and/or the second burst zone.

In a preferred embodiment of the present invention, the peripheral edge of the explosion-proof plate is provided with a welding portion.

In a preferred embodiment of the present invention, the first explosion-proof groove is formed by continuously provided scores, or the first explosion-proof groove is formed by intermittently provided scores.

In a preferred embodiment of the present invention, the second explosion-proof groove is formed by continuously provided scores, or the second explosion-proof groove is formed by intermittently provided scores.

The utility model provides a battery shell which comprises the battery explosion-proof structure.

The utility model provides a battery which comprises the battery explosion-proof structure.

The technical scheme of the utility model has the following remarkable beneficial effects:

this application battery explosion-proof structure can form two blasting districts through the explosion-proof groove on the surface in the both sides of explosion-proof piece, in the use, when pressure in the battery surpassed the setting value, can carry out the pressure release to the battery through blasting district in time, prevents that the thermal runaway phenomenon from appearing in the battery. In the manufacturing process, because the both sides surface of explosion-proof piece all is equipped with explosion-proof groove, the both sides surface of explosion-proof piece is punched simultaneously to the integrative stamping forming technology of accessible, and then accomplishes the manufacturing process of explosion-proof piece, adopts the both sides surface of integrative stamping forming technology simultaneous punching press explosion-proof piece to be favorable to controlling the degree of depth and the quality of seting up of explosion-proof groove, is convenient for manufacture and has reduced manufacturing cost, and can also improve the yield of explosion-proof piece. The above effect is more remarkable particularly when the explosion-proof sheet is made of a metal having high hardness and poor ductility.

The explosion-proof grooves are formed in the surfaces of the two sides of the explosion-proof piece to form an explosion area, so that one explosion-proof groove can be arranged in the battery, the explosion-proof groove can bear the internal pressure of the battery more directly, and the explosion-proof piece is favorable for improving the accuracy and stability of explosion-proof piece blasting.

Further, through set up additional strengthening on one of them or two in first blasting district and second blasting district, reinforce the blasting district through additional strengthening, can improve the fatigue resistance intensity in blasting district, prevent that the blasting district from receiving fatigue effect to influence breakage or open by mistake for the explosion proof piece is more reliable and more stable, and the use is safer.

This application battery case with the battery has more stable explosion point through applying above-mentioned battery explosion-proof structure, can improve the security in battery case and the battery use. And can also prevent that the explosion-proof piece from appearing inefficacy because of fatigue stress through the additional strengthening that sets up on the blasting district, increased the stability and the reliability of battery shell and battery.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the description below are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.

The drawings described herein are for illustration purposes only and are not intended to limit the scope of the present disclosure in any way. In addition, the shapes, the proportional sizes, and the like of the respective members in the drawings are merely schematic for facilitating the understanding of the present invention, and do not specifically limit the shapes, the proportional sizes, and the like of the respective members of the present invention. Those skilled in the art, having the benefit of the teachings of this invention, may choose from the various possible shapes and proportional sizes to implement the utility model as a matter of case.

FIG. 1 is a perspective view of an explosion-proof structure of a battery;

fig. 2 is a schematic top view of the explosion-proof structure of the battery;

FIG. 3 is a schematic diagram of another top view of the explosion-proof structure of the battery;

FIG. 4 is a schematic perspective view of an explosion-proof structure of a circular battery;

FIG. 5 is a schematic cross-sectional view of an explosion-proof structure of a circular battery;

FIG. 6 is a schematic cross-sectional view of the first explosion-proof groove and the second explosion-proof groove arranged in a staggered manner;

FIG. 7 is a schematic view of the first thickness, the second thickness and the third thickness direction;

FIG. 8 is a schematic sectional view of the first explosion-proof groove and the second explosion-proof groove symmetrically arranged;

FIG. 9 is a schematic sectional view of a first semicircular explosion-proof groove and a second semicircular explosion-proof groove;

FIG. 10 is a schematic sectional view of the first U-shaped explosion-proof groove and the second U-shaped explosion-proof groove;

FIG. 11 is a schematic sectional view of a trapezoidal first explosion-proof groove and a trapezoidal second explosion-proof groove;

FIG. 12 is a schematic sectional structural view of a rectangular first explosion-proof groove and a rectangular second explosion-proof groove;

FIG. 13 is a schematic sectional view of a triangular first explosion-proof groove and a rectangular second explosion-proof groove;

FIG. 14 is a schematic sectional view of the triangular first explosion-proof groove and the U-shaped second explosion-proof groove.

Reference numerals of the above figures:

1. an explosion-proof sheet;

2. a first explosion-proof tank; 21. a first blast zone; 22. a first bottom end;

3. a second explosion-proof tank; 31. a second blast zone; 32. a second bottom end;

4. a reinforcing structure; 41. reinforcing ribs;

5. and (7) welding the parts.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In most of the explosion-proof mechanisms in the prior art, a nick is arranged on one side to form an explosion area. When the pressure in the battery is larger than the set value of the explosion-proof mechanism, the explosion area is broken, and the battery is decompressed. When the metal with lower hardness and better ductility is processed, the nick is easily processed to the designated depth by the mode of arranging the nick on one side, and the precision of the nick depth can be ensured. In the actual use process, a mathematical relation exists between the notch setting depth and the blasting pressure, the blasting pressure can be determined according to the notch depth, and when the pressure reaches a set value, the stable explosion-proof mechanism with the stable blasting point is obtained through accurate blasting. However, when handling the metal that hardness is higher and ductility is relatively poor, can make the course of working of unilateral nick more difficult, be difficult to guarantee the processingquality of unilateral nick, difficult accurate processing to the appointed degree of depth, and then can't guarantee explosion-proof mechanism's opening pressure's stability for explosion-proof mechanism's reliability descends. And, can play the effect that reduces the opening pressure of explosion-proof piece through the depth of work that increases the unilateral nick, nevertheless unilateral nick when the processing site is too deep on the explosion-proof piece, can reduce the joint strength between blasting district and the explosion-proof piece for risks such as damage, open by mistake appear in the blasting district, reduced the reliability of explosion-proof piece.

The application provides a battery explosion-proof structure mainly used solves the blasting precision that unilateral nick caused and hangs down, the problem of processing difficulty.

Referring to fig. 1 to 5 in combination, the present application provides a battery explosion-proof structure, where the battery explosion-proof structure includes an explosion-proof sheet 1, and the explosion-proof sheet 1 has a first surface and a second surface opposite to each other along a thickness direction. The first surface is provided with at least one first explosion-proof groove 2 which does not penetrate through the explosion-proof sheet 1, and the first explosion-proof groove 2 forms a first explosion area 21 on the first surface. The second surface is provided with at least one second explosion-proof groove 3 which does not penetrate through the explosion-proof sheet 1, and the second explosion-proof groove 3 forms a second explosion area 31 on the second surface. A reinforcing structure 4 is arranged on the first blasting zone 21 and/or the second blasting zone 31.

On the whole, the battery explosion-proof structure that this application provided, in the use, when pressure in the battery exceeded the setting value, through setting up two blasting districts on the surface in the both sides of explosion-proof piece 1, can carry out the pressure release to the battery in time, prevents that the thermal runaway phenomenon from appearing in the battery. Through set up explosion-proof groove simultaneously at the both sides surface of explosion-proof piece 1, the manufacturing process is accomplished to the both sides surface of accessible integrative stamping forming technology punching press explosion-proof piece 1 simultaneously, is convenient for control explosion-proof groove set up degree of depth and quality, reduction in production cost and improvement yield. And an explosion-proof groove is arranged inside the battery, so that the explosion-proof groove can directly bear the internal pressure of the battery, and the opening accuracy of the explosion-proof groove is convenient to improve. Further, through set up additional strengthening 4 on the blasting district, can improve the antifatigue intensity in blasting district through additional strengthening 4, prevent that the blasting district from appearing damaged or open by mistake because of fatigue stress for explosion proof sheet 1 is more reliable, uses safelyr. Wherein, can set up additional strengthening 4 alone on first blasting district 21, also can set up additional strengthening 4 alone in second blasting district 31, or set up additional strengthening 4 in first blasting district 21 and second blasting district 31 simultaneously, the designer can rationally set up according to the user's needs, does not do the restriction here.

In the description of the present application, reference will be made to the detailed description of the embodiments and the accompanying drawings.

Specifically, referring to fig. 1 to 14, the battery explosion-proof structure may include: an explosion-proof sheet 1; a first explosion-proof tank 2; a second explosion-proof tank 3; a reinforcing structure 4; and a welded portion 5.

In the present embodiment, referring to fig. 6 and 7, in the thickness direction of the rupture disk 1, the first rupture groove 2 has a first bottom end 22, the second rupture groove 3 has a second bottom end 32, and the first bottom end 22 and the second bottom end 32 are staggered in the thickness direction of the rupture disk 1. Through with stagger setting between the first bottom 22 of first explosion-proof groove 2 and the second bottom 32 of second explosion-proof groove 3, can avoid first explosion-proof groove 2 and second explosion-proof groove 3 to add the phenomenon that the stress concentration appears in man-hour, prevents that the stress concentration from in same thickness direction and then leading to explosion-proof piece 1 to appear cracked. Specifically, both side surfaces of the explosion-proof sheet 1 may be simultaneously punched through an integral punch forming process, thereby completing the manufacturing process of the explosion-proof sheet 1. The two side surfaces of the explosion-proof sheet 1 are simultaneously punched by adopting an integrated punch forming process, so that the opening depth and quality of the explosion-proof groove can be controlled, the production and the manufacture are facilitated, the production cost is reduced, and the yield of the explosion-proof sheet 1 can be improved. In particular, when a metal having high hardness and poor ductility is used for the rupture disk 1, the above effect is more remarkable. Of course, other manufacturing processes may be adopted by the designer, and the stamping process is taken as an example, and the other manufacturing processes are not limited.

Specifically, along the thickness direction of the rupture disk 1, the minimum thickness of the first bottom end 22 from the second surface or the side wall of the second rupture groove 3 is a first thickness a, and the minimum thickness of the second bottom end 32 from the first surface or the side wall of the first rupture groove 2 is a second thickness b. The minimum thickness between the first explosion-proof groove 2 and the second explosion-proof groove 3 is a third thickness c, and the third thickness c is smaller than the first thickness a and the second thickness b. The designer can reasonably set the size and the spacing distance of the first explosion-proof groove 2 and the second explosion-proof groove 3, and further determine the size of the first thickness a and the second thickness b, which is not limited herein.

By making the third thickness c smaller than the first thickness a and the second thickness b, the thinned region in which the thinnest region is formed by the first thickness a or the thinned region formed by the second thickness b is transferred to the thinned region formed by the third thickness c. In the thickness direction of explosion-proof piece 1, the attenuate region that first thickness a formed and the attenuate region that second thickness b formed are relatively thicker, can provide the support blast zone better, prevent that blast zone from receiving the crushing effect and appearing the damage. Meanwhile, a weaker area can be provided for blasting through the relatively thin third thickness c, and when the pressure reaches a set value, the weakened area formed by the thin third thickness c can be broken for pressure relief.

Through adopting above-mentioned design, improved the joint strength of blasting area and explosion-proof piece 1 on the one hand for the blasting area can be connected on explosion-proof piece 1 more firmly, can bear the respiratory of more batteries and get the edge that the extrusion produced of putting the ascending fatigue stress of thickness direction of explosion-proof piece 1 has increased the stability of explosion-proof piece 1. On the other hand, the third thickness c arranged between the first explosion-proof groove 2 and the second explosion-proof groove 3 is used as an explosion weak area, one explosion-proof groove can be arranged in the battery in the using process, the internal pressure of the battery can be directly received by the explosion-proof groove, when the pressure in the battery exceeds the bearing value of the third thickness c, the third thickness c area is broken to complete pressure relief, and the explosion precision can be controlled more accurately by adjusting the size of the third thickness c.

Further, in the present embodiment, at least a part of the first explosion-proof groove 2 and the second explosion-proof groove 3 are disposed at the same height. Through the first explosion-proof groove 2 and the second explosion-proof groove 3 are partially overlapped in the thickness direction of the explosion-proof piece 1, the third thickness c is enabled to be formed in the overlapped portion of the first explosion-proof groove 2 and the second explosion-proof groove 3, and then the pressure in the battery can act on the weak area formed by the third thickness c along the lengthwise extending direction of the explosion-proof piece 1. Make first thickness a and second thickness b can bear the pressure of following the thickness direction effect of explosion-proof piece 1 better, and third thickness c can bear the battery internal pressure of following the lengthwise extending direction effect of explosion-proof piece 1 better, improved the bearing capacity of blasting district along the thickness direction on explosion-proof piece 1 on the one hand for explosion-proof piece 1 is reliable and stable more, and on the other hand is convenient for control third thickness c's size, and then accurately control detonation pressure. The size of the overlapping part between the first explosion-proof groove 2 and the second explosion-proof groove 3 can be reasonably determined by a designer according to actual use needs, and is not limited herein.

In this embodiment, the first explosion-proof groove 2 and the second explosion-proof groove 3 may be concentrically arranged on two opposite side surfaces of the explosion-proof sheet 1. Specifically, the first explosion-proof groove 2 and the second explosion-proof groove 3 can be concentrically arranged, the first explosion-proof groove 2 and the second explosion-proof groove 3 are arranged in a staggered manner in the thickness direction of the explosion-proof sheet 1, so that the explosion area with a smaller area is arranged inside the battery, the explosion area with a larger area is arranged outside the battery, and the situation that the explosion area cannot be broken from the explosion-proof sheet 1 can be prevented. Through adopting first explosion-proof groove 2 and the setting of arranging with second explosion-proof groove 3 with one heart, can make first explosion-proof groove 2 and second explosion-proof groove 3 around forming two comparatively evenly distributed's blasting district on the relative both sides surface of rupture disk 1, have more even mechanical distribution around the explosion-proof groove that sets up, can improve the homogeneity that the blasting district was broken open, play the pressure release effect better.

Of course, as another alternative arrangement of the first explosion-proof groove 2 and the second explosion-proof groove 3, the first explosion-proof groove 2 and the second explosion-proof groove 3 may be symmetrically arranged on two opposite side surfaces of the explosion-proof sheet 1. The first explosion-proof groove 2 and the second explosion-proof groove 3 can form symmetrical blasting areas on the surfaces of the two sides of the explosion-proof piece 1 through symmetrical arrangement, and the stability of the explosion-proof piece 1 is improved.

In this embodiment, the first blasting region 21 and/or the second blasting region 31 are thinned, and the thinning depth of the blasting region is smaller than the setting depth of the corresponding explosion-proof slot. Through carrying out the attenuate setting with first blasting district 21 and/or second blasting district 31, can reduce the bulk strength in blasting district, also make the blasting district form the cell shape for the battery internal pressure can direct action more on blasting district, has played better blasting effect. Specifically, the first blasting area 21 can be thinned independently, or the second blasting area 31 can be thinned independently, or the first blasting area 21 and the second blasting area 31 can be thinned simultaneously, so that the first blasting area 21 and the second blasting area 31 can be reasonably set by a designer as required, and the limitation is not required.

In the present embodiment, referring to fig. 8 to 12, the cross-sectional shape of the first explosion-proof groove 2 is the same as the cross-sectional shape of the second explosion-proof groove 3. Specifically, the cross section of the anti-explosion groove may be in a V shape, a U shape, a trapezoid shape, a rectangular shape, or a semicircular shape, and the like, and a designer may set the cross section of the anti-explosion groove in other shapes according to needs, which is not limited herein.

Of course, as another alternative to the cross-sectional shape of the explosion-proof groove, in the present embodiment, referring to fig. 13 and 14, the cross-sectional shape of the first explosion-proof groove 2 is different from the cross-sectional shape of the second explosion-proof groove 3. Specifically, for example, the cross-sectional shape of the first explosion-proof groove 2 may be one of V-shaped, U-shaped, trapezoidal, rectangular or semicircular, and the cross-sectional shape of the second explosion-proof groove 3 may be another one of V-shaped, U-shaped, trapezoidal, rectangular or semicircular. Of course, the designer can set the cross-sectional shape of the first explosion-proof groove 2 and the cross-sectional shape of the second explosion-proof groove 3 to other shapes, which is not limited herein.

In this embodiment the reinforcing structure 4 comprises at least one reinforcing bead 41 provided on the first burst zone 21 and/or the second burst zone 31. Specifically, the reinforcing structure 4 may be separately disposed on the first blasting region 21, or the reinforcing structure 4 may be separately disposed on the second blasting region 31, or the reinforcing structure 4 may be simultaneously disposed on the first blasting region 21 and the second blasting region 31, and a designer may reasonably select a disposition manner of the reinforcing structure 4 according to a use requirement, which is not limited herein. Wherein, the structure of the reinforcing rib 41 can be a linear structure, or the structure of the reinforcing rib 41 can be a planar structure. For example, the reinforcing ribs 41 may be provided in a single letter shape or a plurality of letter arrangement shapes, and the reinforcing ribs 41 may be provided in various patterns, which are reasonably selected by a designer, without limitation. Through set up strengthening rib 41 on one of them or two in first blasting district 21 and second blasting district 31, reinforce the blasting district through strengthening rib 41, can improve the fatigue resistance intensity in blasting district, prevent that the blasting district from receiving fatigue effect to influence breakage or open by mistake for explosion proof sheet 1 is more reliable and more stable, and the use is safer.

In the present embodiment, the peripheral edge of the rupture disk 1 is provided with a welding portion 5 in a surrounding manner. The explosion-proof sheet 1 can be welded and connected to the explosion-proof valve or the battery case through the welding part 5, so that the explosion-proof valve or the battery case can obtain an explosion-proof function.

In the present embodiment, the first explosion-proof groove 2 is formed by continuously provided scores, or the first explosion-proof groove 2 is formed by intermittently provided scores. When the first explosion-proof groove 2 is formed through the nicks which are discontinuously arranged, the breaking part of the nicks enables the explosion area to be connected with the explosion-proof sheet 1 on the outer side of the nicks, the explosion area can be prevented from flying out, and a good safety protection effect is achieved. Further, the second explosion-proof groove 3 is formed by continuously arranged scores, or the second explosion-proof groove 3 is formed by intermittently arranged scores. The designer can reasonably combine the notch arrangement modes of the first explosion-proof groove 2 and the second explosion-proof groove 3 according to the use requirement, and the design is not limited here.

This application during battery explosion-proof structure uses, when the pressure in the battery exceeded the setting value, the first blasting district 21 of first explosion-proof groove 2 formation and the second blasting district 31 of the formation of second explosion-proof groove 3 can break in time and then carry out the pressure release to the battery, prevent that the thermal runaway phenomenon from appearing in the battery.

This application battery explosion-proof structure's beneficial effect: because the both sides surface of explosion-proof piece 1 all is equipped with explosion-proof groove, the both sides surface of the integrative stamping forming technology of accessible punching press explosion-proof piece 1 simultaneously, and then accomplish explosion-proof piece 1's manufacturing process, adopt the both sides surface of integrative stamping forming technology punching press explosion-proof piece 1 simultaneously to be favorable to controlling the degree of depth and the quality of seting up of explosion-proof groove, be convenient for manufacture and reduced manufacturing cost, and can also improve explosion-proof piece 1's yield. In particular, when a metal having high hardness and poor ductility is used for the rupture disk 1, the above effect is more remarkable. And form the blasting district through set up explosion-proof groove simultaneously on the both sides surface at explosion-proof piece 1 for one of them explosion-proof groove can set up inside the battery, makes this explosion-proof groove can bear the effect of pressing in the battery more directly, is favorable to promoting the accuracy and the stability of explosion-proof piece 1 blasting. Further, through set up additional strengthening 4 on one of them or two of first blasting district 21 and second blasting district 31, reinforce the blasting district through additional strengthening 4, can improve the fatigue resistance intensity in blasting district, prevent that the blasting district from receiving fatigue effect influence breakage or open by mistake for explosion-proof piece 1 is more reliable and more stable, and the use is safer.

The present application provides a battery case including the battery explosion-proof structure as described in the foregoing embodiments. Specifically, the battery explosion-proof structure can be mounted on the battery shell in a welding mode, so that the battery shell has an explosion-proof function. And can also prevent that explosion-proof piece 1 from appearing inefficacy because of fatigue stress through the additional strengthening 4 that sets up on the blasting district for battery case is more reliable and more stable. Of course, the battery explosion-proof structure can be fixed on the battery shell by other mounting methods, and the battery explosion-proof structure is not limited here.

The present application provides a battery including the battery explosion-proof structure as described in the foregoing embodiments. Through set up on the battery explosion-proof structure, when the excessive pressure in the battery, can play the pressure release effect, prevent that thermal runaway from appearing in the battery, improved battery safety in utilization.

All articles and references disclosed, including patent applications and publications, are hereby incorporated by reference for all purposes. The term "consisting essentially of …" describing a combination shall include the identified element, ingredient, component or step as well as other elements, ingredients, components or steps that do not materially affect the basic novel characteristics of the combination. The use of the terms "comprising" or "including" to describe combinations of elements, components, or steps herein also contemplates embodiments that consist essentially of such elements, components, or steps. By using the term "may" herein, it is intended to indicate that any of the described attributes that "may" include are optional. A plurality of elements, components, parts or steps can be provided by a single integrated element, component, part or step. Alternatively, a single integrated element, component, part or step may be divided into separate plural elements, components, parts or steps. The disclosure of "a" or "an" to describe an element, ingredient, component or step is not intended to foreclose other elements, ingredients, components or steps.

The embodiments in the present specification are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. The above embodiments are merely illustrative of the technical ideas and features of the present invention, and the purpose thereof is to enable those skilled in the art to understand the contents of the present invention and implement the present invention, and not to limit the protection scope of the present invention. All equivalent changes and modifications made according to the spirit of the present invention should be covered within the protection scope of the present invention.

Claims (15)

1. The battery explosion-proof structure is characterized by comprising an explosion-proof sheet, wherein the explosion-proof sheet is provided with a first surface and a second surface which are oppositely arranged along the thickness direction;

the first surface is provided with at least one first explosion-proof groove which does not penetrate through the explosion-proof sheet, and the first explosion-proof groove forms a first explosion area on the first surface;

the second surface is provided with at least one second explosion-proof groove which does not penetrate through the explosion-proof sheet, and the second explosion-proof groove forms a second explosion area on the second surface;

and a reinforcing structure is arranged on the first blasting area and/or the second blasting area.

2. The battery explosion-proof structure of claim 1, wherein the first explosion-proof groove has a first bottom end and the second explosion-proof groove has a second bottom end along a thickness direction of the explosion-proof sheet, and the first bottom end and the second bottom end are staggered in the thickness direction of the explosion-proof sheet.

3. The battery explosion-proof structure as set forth in claim 2, wherein the minimum thickness of the first bottom end from the second surface or the side wall of the second explosion-proof groove is a first thickness and the minimum thickness of the second bottom end from the first surface or the side wall of the first explosion-proof groove is a second thickness in the thickness direction of the explosion-proof sheet;

the minimum thickness between the first explosion-proof groove and the second explosion-proof groove is a third thickness, and the third thickness is smaller than the first thickness and the second thickness.

4. The explosion proof structure for battery as set forth in claim 3, wherein at least a part of said first explosion proof groove and said second explosion proof groove are provided at the same height.

5. The battery explosion prevention structure of claim 1, wherein said first explosion prevention groove and said second explosion prevention groove are concentrically arranged on opposite side surfaces of said explosion prevention sheet.

6. The battery explosion prevention structure of claim 5, wherein said first explosion prevention groove and said second explosion prevention groove are symmetrically provided on opposite side surfaces of said explosion prevention sheet.

7. The battery explosion-proof structure of claim 1, wherein the first blasting region and/or the second blasting region are/is arranged in a thinning manner, and the thinning depth of the blasting region is smaller than the arrangement depth of the corresponding explosion-proof groove.

8. The battery explosion prevention structure of any one of claims 1 to 7, wherein the cross-sectional shape of said first explosion prevention groove is the same as the cross-sectional shape of said second explosion prevention groove.

9. The battery explosion prevention structure of any one of claims 1 to 7, wherein a cross-sectional shape of the first explosion prevention groove is different from a cross-sectional shape of the second explosion prevention groove.

10. The battery explosion prevention structure of claim 1, wherein said reinforcing structure comprises at least one reinforcing bead disposed on said first burst region and/or said second burst region.

11. The explosion proof structure for battery as claimed in claim 1, wherein the peripheral edge of said explosion proof sheet is provided with a welding portion circumferentially.

12. The explosion proof structure of a battery as set forth in claim 1, wherein said first explosion proof groove is formed of continuously arranged scores or said first explosion proof groove is formed of intermittently arranged scores.

13. The explosion proof structure of a battery as set forth in claim 12, wherein said second explosion proof groove is formed of continuously arranged scores or said second explosion proof groove is formed of intermittently arranged scores.

14. A battery case characterized by comprising the battery explosion-proof structure according to any one of claims 1 to 13.

15. A battery comprising the battery explosion-proof structure according to any one of claims 1 to 13.

Images