CN218448155U

CN218448155U - Battery shell, battery shell and battery

Info

Publication number: CN218448155U
Application number: CN202222416456.9U
Authority: CN
Inventors: 张庆; 白方磊; 杨行; 杨维领; 吴辉
Original assignee: Liyang Zhongke Haina Technology Co ltd
Current assignee: Liyang Zhongke Haina Technology Co ltd
Priority date: 2022-09-13
Filing date: 2022-09-13
Publication date: 2023-02-03
Anticipated expiration: 2032-09-13

Abstract

The utility model provides a battery case, battery case and battery, battery case is including having the open-ended casing, the casing is close to opening edge department and is provided with at least one separation structure, the separation structure is followed opening edge length direction sets up. The utility model discloses a be close to opening edge department (casing and cover connection sealing department promptly) on the casing and set up the separation structure, the battery is at inflation or shrink in-process, and stress is when conducting to both ends along the casing center, and the stress transmission is effectively blocked to the separation structure to avoid the repeated deformation of casing and cover connection department, improve battery case's sealed effect.

Description

Battery shell, battery shell and battery

Technical Field

The utility model belongs to the technical field of the battery, a battery case, battery case and battery is related to.

Background

At present, after a battery core is arranged in a shell, a cover plate and the shell are welded together, so that a sealed whole is formed, and only a small liquid injection hole is reserved to prepare for subsequent injection of electrolyte.

In order to ensure the whole sealing performance of the battery, leakage detection needs to be carried out before liquid injection, and if the phenomenon of air leakage is found, the battery is judged to be a defective product and needs to be reworked or scrapped. At present, two leakage detection methods are available, one is to extract gas in the battery through a liquid injection hole to form vacuum, maintain the pressure for a period of time, see the change of the vacuum in the battery, and determine that the gas leakage is poor when the gas leakage is larger than a certain value. The other mode is that gas in the battery is extracted, a certain amount of helium is injected through a liquid injection hole, then whether the helium exists is detected outside the battery, and if the value of the helium exceeds a certain value, the battery is judged to be a defective product.

These two kinds of leak hunting modes all can extract the inside gas of battery for the inside vacuum that forms of battery, and the electric core of inside packing is not all can support battery case, consequently receives the effect of atmospheric pressure, and battery case can be inside sunken, and when the release vacuum, when getting back to the ordinary pressure state, battery case rebounds back again, consequently the welding seam between casing shell mouth and apron can receive the effort of sled. And the deformation and recovery of the battery case involve four processes in the manufacturing process. In addition, the lithium ion or sodium ion battery can also be because the casing is bloated when charging in subsequent charge-discharge use, the flat condition of battery during discharge, consequently the welding seam of battery shell mouth and apron can receive the effort of prying for a long time, and the weeping that loses efficacy very easily.

Therefore, how to provide a battery shell can effectively avoid welding failure between a cover plate and the shell caused by expansion and contraction of a battery in the use process becomes a technical problem which needs to be solved urgently at present.

SUMMERY OF THE UTILITY MODEL

Not enough to prior art exists, the utility model aims to provide a battery case, battery case and battery sets up the separation structure through being close to opening edge department (casing and the sealed department of cover connection promptly) on the casing, and the battery is at inflation or shrink in-process, and when stress was conducted to both ends along the casing center, the separation structure effectively blocked stress transmission to avoid the repeated deformation of casing and cover connection department, improve battery case's sealed effect.

To achieve the purpose, the utility model adopts the following technical proposal:

in a first aspect, the present invention provides a battery housing, the battery housing includes a housing having an opening, the housing is provided with at least one blocking structure near an opening edge, the blocking structure is followed the opening edge length direction sets up.

The utility model discloses a set up the separation structure on the casing, at the expanded in-process of battery, stress is conducted to both ends by the casing center, when transmitting to the separation structure, stress conduction is blocked to stop deformation in separation structure department, furthermore, the shell opening edge (promptly with the sealed department of being connected of apron) can not receive deformation influence, and then guaranteed the welded seal effect between apron and the casing, avoided the battery to destroy the problem that causes the weeping at inflation and shrink in-process welding seam, the security of battery has been improved.

It should be noted that, the utility model discloses do not do specific requirements and special restriction to the material of casing, the skilled person in the art can rationally select according to battery type and structural requirement, for example, the casing is the aluminum hull.

As a preferred technical scheme of the utility model, along keeping away from the direction at opening edge, the separation structure is provided with at least one.

The utility model discloses a direction keeping away from the opening edge is provided with a plurality of separation structures to strengthen stress separation effect, further reduced the inflation or the shrinkage stress deformation of apron with the casing junction.

It should be noted that, the blocking structure of the present invention is disposed between the opening edge and the center of the casing, so that the expansion space is inevitably left between the blocking structure and the center of the casing, as known to those skilled in the art, to satisfy the requirement of battery expansion.

As a preferred technical scheme of the utility model, the distance between the opening edge and the nearest barrier structure is 1/20-1/5 of the height of the shell, such as 1/20, 1/19, 1/18, 1/17, 1/16, 1/15, 1/14, 1/13, 1/12, 1/11, 1/10, 1/9, 1/8, 1/7, 1/6 or 1/5.

The utility model discloses a distance between control opening edge and the separation structure guarantees to leave certain buffer zone between separation structure and the opening edge, guarantees that the separation structure blocks stress conduction back, and buffer zone can have the small deformation of part and not influence the joint weld of apron and casing.

As a preferred embodiment of the present invention, the distance between the opening edge and the closest blocking structure is 30-100 mm, such as 30mm, 35mm, 40mm, 45mm, 50mm, 55mm, 60mm, 65mm, 70mm, 75mm, 80mm, 85mm, 90mm, 95mm or 100mm.

It should be noted that the utility model discloses the distance between well opening edge and the adjacent separation structure can be according to casing size reasonable selection, satisfy the battery inflation requirement can.

As a preferred technical scheme of the utility model, the separation structure includes the separation groove, the separation groove is followed the length direction at opening edge is seted up.

The utility model discloses a set the separation structure to the separation groove, need not additionally to add the structure at the casing outer wall, guarantee the convenience of battery equipment process, further, at the in-process that blocks stress deformation, because there is certain deformation space of groove-like structure, effectively guarantee the requirement of expansion stress deformation.

It should be noted that, the utility model discloses in do not do specific requirements and special limitation to the mode of seting up of separation groove, technical personnel in the field can rationally select according to casing material and thickness, for example the mode of seting up of separation groove can be carved pressure.

It should be noted that, the utility model discloses in do not do specific requirement and special limitation to the structure in separation groove, technical staff in the field can be according to battery inflation condition reasonable selection, for example, separation groove can be two separation grooves or follow the continuous one separation groove that sets up of opening edge length direction of seting up at two opposite flanks of casing, and separation groove can be multistage structure promptly and also can be continuous structure, and the separation groove of whole constitution can realize the inflation stress separation and satisfy shell structure intensity can.

As a preferable technical scheme of the utility model, the depth of the barrier groove is 1/10-1/2 of the thickness of the shell wall surface, for example, 1/10, 1/9, 1/8, 1/7, 1/6, 1/5, 1/4, 1/3 or 1/2.

As a preferred embodiment of the present invention, the depth of the blocking groove is 0.2 to 1.5mm, for example, 0.2mm, 0.3mm, 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1.0mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm or 1.5mm.

It should be noted that the utility model discloses in can be according to casing intensity requirement and the reasonable setting of separation stress conduction effect to the degree of depth in separation groove.

As a preferable technical solution of the present invention, the cross-sectional shape of the blocking groove includes a V-shape or a trapezoid.

In a second aspect, the present invention provides a battery case, the battery case includes a battery case body as described in the first aspect, an opening of the battery case body is provided with a cover plate.

It should be noted that, the utility model discloses do not specifically require and specially prescribe a limit to the structure of apron, the technical personnel in the field can rationally select the apron according to battery structural design, for example be provided with on the apron and annotate liquid hole, utmost point post hole and explosion-proof hole, and further, annotate the liquid hole and set up notes liquid valve, explosion-proof hole and set up explosion-proof valve, utmost point post hole sets up utmost point post.

In a third aspect, the present invention provides a battery, the battery includes a housing and an electrical core disposed in the housing, the housing is provided with a battery housing according to the first aspect.

It should be noted that, the utility model discloses do not do concrete requirement and special limitation to the kind of electric core, technical staff in the field can rationally select according to the battery kind, for example, electric core includes sodium ion electricity core or lithium ion battery cell, and corresponding electrolyte has been injected into to the battery case.

In an exemplary embodiment, a method for testing the tightness of the battery during the expansion or contraction process of the battery is provided, where the battery is subjected to the expansion and contraction process of the battery, the expansion process is the same as the contraction process, and only the deformation direction is different, and taking the battery expansion process as an example, the method specifically includes the following steps:

the casing takes place the inflation, at first produces inflation deformation at casing central part, further along with the inflation grow, conducts to both ends along the casing center, when conducting to the separation structure, the separation structure has blockked the conduction of expansion stress to inflation deformation stops deformation stopping structure department, has reduced the casing deformation of being close to the apron splice, and then the splice does not take place inflation deformation.

The numerical range of the present invention includes not only the point values listed above, but also any point values between the above numerical ranges not listed, which is limited to space and for the sake of brevity, the present invention does not exhaust the specific point values included in the range.

Compared with the prior art, the beneficial effects of the utility model are that:

Drawings

Fig. 1 is a schematic structural diagram of a battery case according to an embodiment of the present invention;

fig. 2 is a front view of a battery case having a barrier groove according to an embodiment of the present invention;

fig. 3 is a cross-sectional view of a side wall of a battery case having a barrier groove according to an embodiment of the present invention;

fig. 4 is a schematic diagram of a battery case according to an embodiment of the present invention;

fig. 5 is a schematic diagram illustrating a swelling state of a battery case provided in embodiment 1 of the present invention;

fig. 6 is a schematic view showing a swelling state of a battery case provided in comparative example 1 of the present invention;

fig. 7 is a schematic diagram of a shrinkage state of the battery case provided in comparative example 1 of the present invention.

Wherein, 100-shell; 101-opening edge; 102-a barrier groove; 200-cover plate.

Detailed Description

It is to be understood that in the description of the present invention, the terms "central," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in the orientation or positional relationship indicated in the drawings for the purpose of convenience and simplicity of description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are not to be construed as limiting the present invention.

It should be noted that, unless explicitly stated or limited otherwise, the terms "disposed," "connected" and "connected" in the description of the present invention are to be construed broadly, and may for example be fixedly connected, detachably connected or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art through specific situations.

The technical solution of the present invention is further explained by the following embodiments with reference to the drawings.

In a specific embodiment, the present invention provides a battery casing, as shown in fig. 1, the battery casing includes a casing 100 having an opening, the casing 100 is provided with at least one blocking structure near an opening edge 101, the blocking structure is arranged along a length direction of the opening edge 101, optionally, the casing 100 is an aluminum shell, a height of the casing 100 is 50-300 mm, and a thickness of the casing 100 is 0.5-3 mm.

Further, as shown in fig. 2 and 3, the blocking structure includes a blocking groove 102, and the blocking groove 102 is opened along a length direction of the opening edge 101. The utility model discloses a set the separation structure to separation groove 102, need not additionally to add the structure at the casing outer wall, guarantee the convenience of battery assembling process, further, at the in-process that blocks stress deformation, because there is certain deformation space of groove-like structure, effectively guarantee the requirement of expansion stress deformation.

Specifically, the depth of the barrier groove 102 is 1/10 to 1/2 of the wall thickness of the housing 100, further, the depth of the barrier groove 102 is 0.2 to 1.5mm, the cross-sectional shape of the barrier groove 102 includes a V shape or a trapezoid shape, optionally, the barrier groove 102 may be two barrier grooves 102 formed on two opposite sides of the housing 100 or one barrier groove 102 continuously formed along the length direction of the opening edge 101, that is, the barrier groove 102 may be a multi-section structure or a continuous structure, the integrally formed barrier groove 102 can realize expansion stress barrier and meet the structural strength of the housing 100, further optionally, a reinforcing rib is provided on one side of the barrier groove 102 close to the opening edge 101, and the anti-deformation effect is further improved.

In particular, the blocking structure is provided with at least one in a direction away from the opening edge 101. The utility model discloses a direction keeping away from opening edge 101 is provided with a plurality of separation structures to strengthen stress separation effect, further reduced the inflation or the shrinkage stress deformation of apron 200 with casing 100 junction. The utility model discloses well separation structure sets up between opening edge 101 and casing 100 center, leaves the inflation space between separation structure and casing 100 center, satisfies the battery inflation requirement.

Specifically, the distance between the opening edge 101 and the closest blocking structure is 1/20 to 1/5 of the height of the housing 100, and further, the distance between the opening edge 101 and the closest blocking structure is 30 to 100mm. The utility model discloses a distance between control opening edge 101 and the separation structure guarantees to leave certain buffer zone between separation structure and the opening edge 101, guarantees that the separation structure blocks stress conduction back, and buffer zone can have the small deformation of part and not influence apron 200 and casing 100's joint weld.

The utility model also provides a battery case, as shown in FIG. 4, battery case includes foretell battery case, battery case's opening part is provided with apron 200. Optionally, be provided with on the apron 200 and annotate liquid hole, utmost point post hole and explosion-proof hole, further, annotate the liquid hole and set up notes liquid valve, explosion-proof hole and set up explosion-proof valve, utmost point post hole and set up utmost point post.

The utility model also provides a battery, the battery include the shell and set up in electric core in the shell, the shell adopts foretell battery case. Optionally, the battery cell includes a sodium ion battery cell or a lithium ion battery cell, and a corresponding electrolyte is injected into the battery case.

In an exemplary embodiment, a method for the battery during the expansion or contraction process is provided, where the tightness of the battery charging/discharging or gas filling detection case 100 tests the expansion and contraction of the battery, the expansion process is the same as the contraction process, and only the deformation direction is different, and taking the battery expansion process as an example, the method specifically includes the following steps:

the casing 100 takes place the inflation, at first produces the inflation deformation at casing 100 central point, further along with the inflation grow, along casing 100 center to both ends conduction, when conducting to the separation structure, the separation structure has blockked the conduction of inflation stress to the inflation deformation stops deformation in stopping structure department, has reduced the casing 100 deformation that is close to the apron 200 welding department, and then the welding department does not take place the inflation deformation.

Example 1

The embodiment provides a battery, which comprises a shell and a battery cell, and as shown in fig. 4, the shell comprises a shell 100 and a cover plate 200 welded to an opening of the shell 100, the shell 100 is provided with a barrier groove 102, the distance between the barrier groove 102 and a welding seam is 40mm, the depth of the barrier groove 102 is 1mm, and the cross-sectional shape of the barrier groove 102 is a V-shape; the height of the casing 100 is 200mm, the wall thickness of the casing 100 is 2mm, and the casing 100 is an aluminum case.

A sodium ion battery cell is arranged in the shell, and electrolyte is injected into the shell. During charging, the battery swells as shown in fig. 5.

Example 2

This example provides a battery, which is different from example 1 in that the barrier groove 102 is not provided, and the remaining structure is completely the same as example 1.

During the use of the battery, the battery expands as shown in fig. 6 and contracts as shown in fig. 7.

Through a specific embodiment, the utility model discloses a set up the separation structure on casing 100, at the expanded in-process of battery, stress is conducted by casing 100 center to both ends, when transmitting to the separation structure, stress conduction is blocked, thereby stop deformation in separation structure department, furthermore, casing 100 opening edge 101 (promptly with the sealed department of being connected of apron 200) can not receive deformation and influence, and then guaranteed the welded seal effect between apron 200 and the casing 100, avoided the battery to destroy the problem that causes the weeping at inflation and shrink in-process welding seam, the security of battery has been improved.

The applicant states that the above description is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto, and those skilled in the art should understand that any changes or substitutions easily conceivable by those skilled in the art within the technical scope of the present invention are within the protection scope and the disclosure scope of the present invention.

Claims

1. A battery shell is characterized by comprising a shell with an opening, wherein at least one blocking structure is arranged on the shell close to the edge of the opening, and the blocking structure is arranged along the length direction of the edge of the opening.

2. The battery case as recited in claim 1, wherein the blocking structure is provided with at least one in a direction away from the opening edge.

3. The battery case according to claim 1, wherein the distance between the opening edge and the closest blocking structure is 1/20 to 1/5 of the height of the case.

4. The battery case according to claim 1, wherein the distance between the edge of the opening and the nearest barrier structure is 30-100 mm.

5. The battery case as recited in any one of claims 1 to 4, wherein the blocking structure comprises a blocking groove, and the blocking groove is opened along a length direction of the opening edge.

6. The battery case according to claim 5, wherein the depth of the barrier groove is 1/10 to 1/2 of the thickness of the case wall surface.

7. The battery case according to claim 5, wherein the depth of the barrier groove is 0.2 to 1.5mm.

8. The battery case of claim 5, wherein the cross-sectional shape of the barrier groove comprises a V-shape or a trapezoid shape.

9. A battery casing, characterized in that the battery casing comprises the battery casing as claimed in any one of claims 1 to 8, and a cover plate is arranged at the opening of the battery casing.

10. A battery, comprising a housing and a battery core disposed in the housing, wherein the housing employs the battery housing of claim 9.