CN220492119U - Shell and battery - Google Patents

Abstract

The embodiment of the application belongs to the technical field of batteries, and particularly relates to a shell and a battery. The embodiment of the application aims to solve the problems that the safety of a battery structure is poor, and explosion danger of the battery is easy to occur in the related technology. The housing of the embodiment of the application comprises: the electrode plate is positioned outside the shell body and arranged on the first side wall, and the first side wall is provided with a through hole; the electrode plate comprises a first sinking table, the first sinking table is positioned in the through hole, and a first explosion-proof groove is formed in the first sinking table. The thickness of the area provided with the first explosion-proof groove is obviously smaller than the thickness of other areas on the shell body, when the battery explodes, the battery will be exploded from the first explosion-proof groove firstly, but not from other areas of the shell body in a large area, the safety margin of the electrode plate is increased, and the risk of explosion of the battery is reduced.

Description

Shell and battery

Technical Field

The embodiment of the application relates to the technical field of battery structures, in particular to a shell and a battery.

Background

Batteries (e.g., lithium ion batteries) have been widely used as power supply devices. In the related art, a battery comprises a rigid shell, a battery core and a cover plate, wherein the rigid shell is provided with a mounting cavity, and the battery core is arranged in the mounting cavity; the mounting cavity has an opening, and a cover plate is disposed at the opening and welded to the rigid housing for sealing the mounting cavity.

However, the battery structure in the related art is not provided with an explosion-proof assembly, and the safety is poor, and the battery is liable to be at risk of explosion.

Disclosure of Invention

The embodiment of the application provides a casing and battery to solve battery structure security poor, the explosion hazard's of battery easily problem.

Embodiments of the present application provide a housing, comprising: a case body having first and second sidewalls opposite in a first direction, and an electrode sheet located outside the case body and disposed on the first sidewall; the first side wall is provided with a through hole, the electrode plate comprises a first sinking table, the first sinking table is positioned in the through hole, and a first explosion-proof groove is formed in the first sinking table.

In some embodiments, which may include the above embodiments, the first sinking platform includes a front face and a back face opposite in the first direction, the back face being adjacent to the interior chamber of the housing body; the first explosion-proof groove is arranged on the front surface and/or the back surface.

In some embodiments, which may include the above embodiments, the first explosion-proof groove is in the shape of an annular groove, an arc groove, or a rectangular groove.

In some embodiments, which may include the above embodiments, the first explosion-proof groove includes a plurality of first explosion-proof grooves, the plurality of first explosion-proof grooves being disposed at the same distance along the second direction; wherein the second direction is perpendicular to the first direction.

In some embodiments that may include the foregoing embodiments, the first explosion-proof tank includes two first explosion-proof tanks, the two first explosion-proof tanks are disposed opposite to each other along the second direction, and a liquid injection hole is disposed on the first sinking platform, and the liquid injection hole is located between the two first explosion-proof tanks; wherein the second direction is perpendicular to the first direction.

In some embodiments, which may include the above embodiments, a cross-section of the first blast groove includes a V-shaped surface, a rectangular surface, or an arcuate surface along the first direction.

In some embodiments, which may include the above embodiments, the housing further includes a sealing spike disposed within the first countersink, the sealing spike including a first surface and a second surface opposite in the first direction, the first surface being proximate to the interior chamber of the housing body, the first surface having a sealing region and an exposed region, the sealing region abutting the front face, the exposed region being exposed to the interior chamber of the housing body through the liquid injection hole; the exposed area is provided with a second explosion-proof groove.

In some embodiments, which may include the above embodiments, the first explosion proof groove is disposed outside of the sealing spike.

In some embodiments, which may include the above embodiments, the front surface is provided with a second sinking platform, the second sinking platform is close to the liquid injection hole and surrounds the liquid injection hole, the second sinking platform includes a top surface and a bottom surface opposite along the first direction, and the bottom surface is close to the inner chamber of the housing main body; the first surface further comprises a second area, the second area and the sealing area are annularly sleeved outside the circular exposed area from inside to outside in sequence, and a gap is reserved between the second area and the top surface.

Embodiments of the present application provide a battery including the housing set forth above.

The embodiment of the application provides a shell and a battery, wherein an electrode plate is positioned outside a shell main body and arranged on a first side wall of the shell main body, a first sinking table is arranged on the electrode plate, and a first explosion-proof groove is arranged on the first sinking table; the thickness of the first sinking table is smaller than that of other areas on the electrode plate, when the battery is burst or exploded, the battery is exploded from the first sinking table firstly, but not from other areas of the shell main body in a large area; meanwhile, a first explosion-proof groove is further formed in the first sinking table, when the battery is burst or exploded, the battery is directly exploded from the first explosion-proof groove, and the specific position of explosion of the battery is further ensured; therefore, the first sinking table and the first explosion-proof groove are arranged, so that the safety margin of the electrode plate can be increased, and the danger of explosion of the battery is reduced.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the application and together with the description, serve to explain the principles of the application.

Fig. 1 is a schematic structural view of a housing according to an embodiment of the present disclosure;

FIG. 2 is a schematic diagram of the electrode plate in the area A in FIG. 1;

FIG. 3 is a schematic diagram of a second embodiment of the electrode sheet in the area A in FIG. 1;

FIG. 4 is a schematic diagram III of the electrode sheet in the area A in FIG. 1;

FIG. 5 is a schematic diagram of the electrode sheet in the area A in FIG. 1;

FIG. 6 is a schematic top view of a housing according to an embodiment of the present disclosure;

fig. 7 is a schematic top view of a second embodiment of the present disclosure;

fig. 8 is a schematic top view of a third embodiment of the present disclosure;

fig. 9 is a schematic top view of a housing according to an embodiment of the present disclosure;

fig. 10 is a schematic top view of a housing according to an embodiment of the present disclosure.

Reference numerals illustrate:

100: a housing body;

101: a first sidewall;

102: a second sidewall;

103: a through hole;

104: a liquid injection hole;

200: a battery cell;

300: an electrode sheet;

301: a first sinking stage;

302: a first explosion-proof tank;

303: a second sedimentation table;

304: a second explosion-proof tank;

400: sealing nails;

500: an insulating sheet.

Specific embodiments thereof have been shown by way of example in the drawings and will herein be described in more detail. These drawings and the written description are not intended to limit the scope of the inventive concepts in any way, but to illustrate the concepts of the present application to those skilled in the art by reference to specific embodiments.

Detailed Description

The battery is short-circuited or a large current generated under the conditions of overcharge and overdischarge causes the battery to rapidly heat up, and the electrolyte reacts or decomposes to generate gas, resulting in an increase in pressure inside the battery, which explodes when the pressure inside the battery exceeds the strength of a connection member or an outer package case for closing the battery. However, the battery in the related art does not provide an assembly capable of explosion protection on the connection member or the exterior can for closing the battery, or does not lack a safety margin on the connection member or the exterior can for closing the battery, resulting in poor battery safety.

In view of the above technical problems, embodiments of the present application provide a housing, in which an electrode plate is provided with a first sinking table, and a first explosion-proof slot is further provided on the first sinking table; the thickness of the area with the first explosion-proof groove is obviously smaller than that of other areas of the shell, when the battery is burst or exploded, the battery is firstly exploded from the first explosion-proof groove, but not exploded in a large area from other areas of the shell; therefore, the first explosion-proof groove can increase the safety margin of the electrode plate and reduce the risk of explosion of the battery; and meanwhile, other explosion-proof components are not required to be additionally arranged.

It should be noted that, the battery provided in the embodiment of the present application includes a button battery, and may also include other types of batteries, which are not limited herein.

For the purposes of making the objects, technical solutions and advantages of the embodiments of the present application more clear, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be made by one of ordinary skill in the art based on the embodiments herein without making any inventive effort, are intended to be within the scope of the present application.

Fig. 1 is a schematic structural diagram of a housing according to an embodiment of the present application, referring to fig. 1, the housing provided in the embodiment of the present application includes: the battery pack comprises a case body 100 and a battery cell 200, wherein the case body 100 is formed in a cylindrical shape, the case body 100 is provided with a first side wall 101 (cover plate), a second side wall 102 (bottom plate) and an annular side wall which are opposite along a first direction (Z direction shown in fig. 1), the second side wall 102 and the annular side wall are integrally formed, the first side wall 101 is welded at an opening of the annular side wall far away from the second side wall 102, and the first side wall 101, the second side wall 102 and the annular side wall are matched together to form the case body 100; the casing further includes an electrode plate 300, the electrode plate 300 is located outside the casing main body 100, and the electrode plate 300 is disposed on the first side wall 101, where the electrode plate 300 may be attached to the first side wall 101, and the first side wall 101 further has a through hole 103.

The housing body 100 has an internal chamber inside for mounting the battery cell 200 such that the battery cell 200 is enclosed within the housing body 100; the battery cell 200 includes a first tab 201 and a second tab 202 (the first tab 201 may be a positive tab, and the second tab 202 may be a negative tab), where the first tab 201 extends toward the first sidewall 101 and is electrically connected to the electrode plate 300 through the through hole 103; the second tab 202 extends toward the second side wall 102 and is electrically connected to an inner wall surface of the second side wall 102, and the housing body 100 is also used for connection with an external device so that the battery can supply power to the external device.

The electrode plate 300 further includes a first sinking platform 301, where the first sinking platform 301 is located in the through hole 103, that is, the through hole 103 is disposed around the first sinking platform 301, the first sinking platform 301 may further be provided with a liquid injection hole 104, the liquid injection hole 104 is located in the through hole 103, and a diameter of the liquid injection hole 104 is smaller than a diameter of the through hole 103; the center axis of the liquid injection hole 104 may be coaxial with the center axis of the through hole 103, and the electrolyte is injected into the case main body 100 through the liquid injection hole 104.

The first explosion-proof tank 302 is further arranged on the first sinking platform 301, and the thickness of the area of the first sinking platform 301 with the first explosion-proof tank 302 is smaller than that of other areas.

The casing of the embodiment of the application, the casing main body 100 has a first side wall 101 and a second side wall 102 opposite along a first direction, the electrode plate 300 is located outside the casing main body 100 and is arranged on the first side wall 101, and the first side wall 101 has a through hole 103; the electrode plate 300 comprises a first sinking platform 301, the first sinking platform 301 is located in the through hole 103, and a first explosion-proof groove 302 is formed in the first sinking platform 301. The thickness of the area with the first sinking platform 301 is obviously smaller than that of other areas of the shell main body 100, when the shell is cracked or exploded, the shell is firstly exploded from the first sinking platform 301, but not exploded in a large area from other areas of the shell; meanwhile, a first explosion-proof groove 302 is further arranged on the first sinking platform 301, when the battery is burst or exploded, the battery is directly exploded from the first explosion-proof groove 302, and the specific explosion position of the battery is further ensured; therefore, the arrangement of the first sinking platform 301 and the first explosion-proof groove 302 can increase the safety margin of the electrode plate 300 and reduce the risk of explosion of the shell; and meanwhile, other explosion-proof components are not required to be additionally arranged.

The first counter 301 may be formed as a circular counter or a rectangular counter.

Referring to fig. 2, fig. 2 is a schematic structural view of an electrode sheet in a region a in fig. 1, in which a first deposition table 301 includes a front surface and a back surface opposite to each other along a first direction (Z direction shown in fig. 2), and the back surface is adjacent to an inner chamber of a housing main body 100; the first explosion-proof groove 302 is provided on the rear surface, and ensures the aesthetic appearance of the entire housing main body 100.

Referring to fig. 3, fig. 3 is a schematic diagram of a second structure of the electrode sheet in the area a in fig. 1, in this embodiment of the present application, the first deposition table 301 includes a front surface and a back surface opposite to each other along the first direction (the Z direction shown in fig. 3), and the back surface is close to the internal chamber of the housing main body 100; the first explosion proof tank 302 may also be provided on the front surface.

Alternatively, both the front and rear sides may be provided with the first explosion proof groove 302, and in the first direction (Z direction shown in fig. 3), the center of the first explosion proof groove 302 of the front side and the center of the first explosion proof groove 302 of the rear side are located on the same straight line; that is, the first explosion-proof groove 302 is provided on both the front and rear surfaces of a certain position on the first sinking table 301, further reducing the thickness of the first sinking table 301 at that position, ensuring that the first explosion is made from that position.

Alternatively, both the front and back sides may be provided with first explosion proof grooves 302, and in the first direction (Z direction shown in fig. 3), the first explosion proof grooves 302 of the front side and the first explosion proof grooves 302 of the back side are staggered.

In the above-described embodiment, the cross-section of the first explosion-proof tank 302 may include a V-shaped surface, a rectangular surface, or an arc-shaped surface in the first direction (the axial direction of the pour spout 104, that is, on the cross-section shown in fig. 2 and 3).

The specific shape of the first explosion-proof tank 302 will be described in detail below taking the case where the first explosion-proof tank 302 is provided on the front surface.

Referring to fig. 6, fig. 6 is a schematic top view of a housing according to an embodiment of the present application, in which, in the second direction (a radial direction of the liquid injection hole 104, that is, a horizontal plane shown in fig. 6), the first explosion-proof groove 302 includes an arc-shaped groove, and the arc-shaped groove is matched with the first sinking platform 301 formed into a circular shape.

Referring to fig. 7, fig. 7 is a schematic top view of a second embodiment of the present disclosure, where, in the embodiment of the present disclosure, along the second direction (on the radial plane of the injection hole 104, that is, the horizontal plane shown in fig. 6), the first explosion-proof slot 302 may also include a rectangular slot.

Referring to fig. 8, fig. 8 is a schematic top view of a housing according to a third embodiment of the present application, where in the above embodiment, the first explosion-proof slot 302 may include a plurality of first explosion-proof slots 302 disposed along a second direction (X direction shown in fig. 8, the second direction being perpendicular to the first direction) with the same distance therebetween, so as to increase the possibility that the housing will first burst out from the first explosion-proof slot 302.

Referring to fig. 9, fig. 9 is a schematic top view diagram of a housing according to the embodiment of the present application, in the above embodiment, the first explosion-proof slots 302 may also include two first explosion-proof slots 302, which are disposed opposite to each other along a second direction (an X direction shown in fig. 9, the second direction is perpendicular to the first direction), and the liquid injection hole 104 is located between the two first explosion-proof slots 302, so as to balance stress.

Referring to fig. 10, fig. 10 is a schematic top view of a housing according to an embodiment of the present application, where the first explosion-proof slot 302 may include an annular groove surrounding the circumference of the liquid injection hole 104.

With continued reference to fig. 1, in this embodiment of the present application, the housing further includes a sealing nail 400, where the sealing nail 400 is disposed on the first sinking stage 301 and is used for sealing the liquid injection hole 104, and the sealing nail 400 includes a first surface and a second surface that are opposite along a first direction (Z direction shown in fig. 1), where the first surface is close to an internal cavity of the housing main body 100, and the first surface has a sealing area, where the sealing area is abutted against a front surface of the first sinking stage 301, so that the sealing nail 400 is connected with the first sinking stage 301 and can seal the liquid injection hole 104, preventing the electrolyte from flowing out, and ensuring normal use of the battery.

With continued reference to fig. 6-10, in an embodiment of the present application, the first explosion proof channel 302 is disposed outside of the sealing spike 400. Wherein, when the first explosion proof groove 302 is an arc-shaped groove, the first explosion proof groove 302 surrounds a part of the peripheral edge of the sealing nail 400; when the first explosion proof groove 302 is an annular groove, the first explosion proof groove 302 surrounds the outer circumference of the sealing nail 400; when the first explosion proof groove 302 is a rectangular groove, the first explosion proof groove 302 has a certain distance from the outer circumference of the sealing nail 400.

Referring to fig. 4, fig. 4 is a schematic structural diagram of an electrode sheet in the area a in fig. 1, in this embodiment of the present application, the first surface further has an exposed area, and the exposed area is exposed to the internal cavity of the housing main body 100 through the liquid injection hole 104, and the exposed area may be provided with a second explosion-proof groove 304; when the casing is burst or exploded, the second explosion-proof groove 304 at the sealing nail 400 will be exploded first, but not from the casing body 100, so as to avoid the casing body 100 from being damaged.

With continued reference to fig. 4, in the embodiment of the present application, the front surface of the first settling platform 301 is provided with a second settling platform 303, the second settling platform 303 is close to the liquid injection hole 104 and surrounds the periphery of the liquid injection hole 104, the second settling platform 303 includes a top surface and a bottom surface opposite along the first direction (the Z direction shown in fig. 4), and the bottom surface is close to the internal chamber of the housing body 100; the first surface further comprises a second area, the second area and the sealing area are annularly sleeved outside the circular exposed area from inside to outside in sequence, that is, the exposed area, the second area and the sealing area are sequentially arranged from inside to outside, a gap is formed between the second area and the top surface of the second sedimentation table 303, and the gap provides redundant accommodating space for electrolyte and prevents the electrolyte from overflowing.

Referring to fig. 5, fig. 5 is a schematic structural diagram of the electrode sheet in the area a in fig. 1, in which in the above embodiment, the second explosion-proof groove 304 may be provided on the non-abutting surface, and when the casing is cracked or exploded, the second explosion-proof groove 304 at the sealing nail 400 will be exploded first, but not from the casing main body 100, so as to avoid damage to the casing main body 100.

It should be noted that the second explosion-proof slot 304 has the same shape as the first explosion-proof slot 302, and will not be described herein.

In the embodiment, the housing body 100 is formed as a cylindrical cavity having an opening, and the first sidewall may include a welding tab, and an edge of the welding tab is welded to the opening, such that the first sidewall is used to close the opening; the electrode plate 300 is attached to the welding plate, the shell further comprises an insulating plate 500, the insulating plate 500 is arranged between the electrode plate 300 and the welding plate, the insulating plate 500 can prevent the electrode plate 300 and the welding plate from being affected with each other, and normal operation of the battery cell 200 is ensured.

The insulating sheet 500 may be a sealing insulating paste, and prevents the electrode sheet 300 and the welding sheet from being affected by each other while sealing the welding portion of the case body 100.

In the above embodiment, the sealant overflows a part, ensuring the insulating effect.

The present embodiment also provides a battery including the housing set forth above.

The battery further includes a battery cell 200, where the battery cell 200 is disposed in the housing body 100 of the housing, the battery cell 200 includes a first tab 201 and a second tab 202, the first tab 201 is electrically connected with the electrode plate 300 through the through hole 103, and the second tab 202 is electrically connected with the inner wall surface of the second sidewall 102.

The casing and the battery provided in this embodiment, the casing main body 100 of the casing has a first side wall and a second side wall 102 opposite along a first direction, the electrode sheet 300 is located outside the casing main body 100 and attached to the first side wall, and the first side wall has a through hole 103; the electrode plate 300 comprises a first sinking platform 301, the first sinking platform 301 is located in the through hole 103, and a first explosion-proof groove 302 is formed in the first sinking platform 301. The thickness of the area with the first sinking platform 301 is obviously smaller than that of other areas of the shell main body 100, when the shell is cracked or exploded, the shell is firstly exploded from the first sinking platform 301, but not exploded in a large area from other areas of the shell; meanwhile, a first explosion-proof groove 302 is further arranged on the first sinking platform 301, when the battery is burst or exploded, the battery is directly exploded from the first explosion-proof groove 302, and the specific explosion position of the battery is further ensured; therefore, the arrangement of the first sinking platform 301 and the first explosion-proof groove 302 can increase the safety margin of the electrode plate 300 and reduce the risk of explosion of the shell; and meanwhile, other explosion-proof components are not required to be additionally arranged.

In this specification, each embodiment or embodiment is described in a progressive manner, and each embodiment is mainly described by differences from other embodiments, and identical and similar parts between the embodiments are mutually referred.

It should be noted that references in the specification to "one embodiment," "an example embodiment," "some embodiments," etc., indicate that the embodiment described may include a particular feature, structure, or characteristic, but every embodiment may not necessarily include the particular feature, structure, or characteristic. Moreover, such phrases are not necessarily referring to the same embodiment. Furthermore, when a particular feature, structure, or characteristic is described in connection with an embodiment, it is submitted that it is within the knowledge of one skilled in the art to effect such feature, structure, or characteristic in connection with other embodiments whether or not explicitly described.

Generally, terms should be understood at least in part by use in the context. For example, the term "one or more" as used herein may be used to describe any feature, structure, or characteristic in a singular sense, or may be used to describe a combination of features, structures, or characteristics in a plural sense, at least in part depending on the context. Similarly, terms such as "a" or "an" may also be understood to convey a singular usage or a plural usage, depending at least in part on the context.

It should be readily understood that the terms "on … …", "above … …" and "above … …" in this disclosure should be interpreted in the broadest sense such that "on … …" means not only "directly on something", but also includes "on something" with intermediate features or layers therebetween, and "above … …" or "above … …" includes not only the meaning "on something" or "above" but also the meaning "above something" or "above" without intermediate features or layers therebetween (i.e., directly on something).

Further, spatially relative terms, such as "below," "beneath," "above," "over," and the like, may be used herein for ease of description to describe one element or feature's relationship to another element or feature as illustrated. Spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. The device may have other orientations (rotated 90 degrees or at other orientations), and the spatially relative descriptors used herein interpreted accordingly.

Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application.

Claims (10)

1. A housing, comprising: a case body having first and second sidewalls opposite in a first direction, and an electrode sheet located outside the case body and disposed on the first sidewall;

the first side wall is provided with a through hole, the electrode plate comprises a first sinking table, the first sinking table is positioned in the through hole, and a first explosion-proof groove is formed in the first sinking table.

2. The housing of claim 1, wherein the first sink deck comprises front and back faces opposite in the first direction, the back face being adjacent to the interior chamber of the housing body;

the first explosion-proof groove is arranged on the front surface and/or the back surface.

3. The housing of claim 1, wherein the first explosion-proof slot is in the shape of an annular slot, an arcuate slot, or a rectangular slot.

4. The housing of claim 1, wherein the first explosion proof slot comprises a plurality of the first explosion proof slots disposed at equal distances along the second direction;

wherein the second direction is perpendicular to the first direction.

5. The housing of claim 2, wherein two of the first explosion-proof grooves are disposed opposite to each other in the second direction, and a liquid injection hole is disposed in the first sinking table, and the liquid injection hole is disposed between the two first explosion-proof grooves;

wherein the second direction is perpendicular to the first direction.

6. The housing of claim 1, wherein a cross-section of the blast-resistant slot in the first direction comprises a V-shaped surface, a rectangular surface, or an arcuate surface.

7. The housing of claim 5, further comprising a sealing spike disposed within the first sink deck, the sealing spike comprising first and second surfaces opposite in the first direction, the first surface being proximate the interior chamber of the housing body, the first surface having a sealing region and an exposed region, the sealing region abutting the front face, the exposed region being exposed to the interior chamber of the housing body through the liquid injection hole;

the exposed area is provided with a second explosion-proof groove.

8. The housing of claim 7, wherein the first explosion proof slot is disposed outside of the sealing spike.

9. The housing of claim 7, wherein the front face is provided with a second sinking stage adjacent to and surrounding the liquid injection hole, the second sinking stage including top and bottom surfaces opposite in the first direction, the bottom surface being adjacent to the interior chamber of the housing body;

the first surface further comprises a second area, the second area and the sealing area are annularly sleeved outside the circular exposed area from inside to outside in sequence, and a gap is reserved between the second area and the top surface.

10. A battery comprising the casing of any one of claims 1-9.