CN218385436U

CN218385436U - Battery and battery shell thereof

Info

Publication number: CN218385436U
Application number: CN202222192589.2U
Authority: CN
Inventors: 曹琳
Original assignee: Dongguan Liwinon Energy Technology Co ltd
Current assignee: Dongguan Liwinon Energy Technology Co ltd
Priority date: 2022-08-19
Filing date: 2022-08-19
Publication date: 2023-01-24
Anticipated expiration: 2032-08-19

Abstract

The utility model belongs to the technical field of battery production and manufacture, in particular to a battery and a battery shell thereof, wherein the battery shell comprises a first shell, a second shell, an electrode terminal and a first insulator; the first shell comprises a first end wall and a first peripheral wall extending downwards along the peripheral edge of the first end wall; the second shell comprises a second end wall and a second peripheral wall extending upwards along the periphery of the second end wall; the first shell and the second shell are welded or fused, and a through hole is formed in the first shell or the second shell; the electrode terminal passes through the through hole and is fixed to the first end wall or the second end wall provided with the through hole through the first insulator in an insulated manner. The first shell and the second shell are connected in a sealing mode in a welding or fusion mode, so that the problem that the mechanical seal causes battery leakage due to uneven stress is avoided. Meanwhile, because a mechanical seal is not used, the reduction of the space utilization rate of the battery caused by the increase of the thickness of the insulating member in consideration of the compression ratio of the insulating member is not needed.

Description

Battery and battery shell thereof

Technical Field

The utility model belongs to the technical field of battery production manufacturing, concretely relates to battery and battery case thereof.

Background

The steel shell battery has the advantages of high energy density, high working voltage, low self-discharge rate, no memory effect and high assembly performance, and is widely applied to the field of intelligent wearing.

The common steel shell button cell comprises two semi-enclosed metal shells and an insulating part arranged between the two metal shells, wherein the two metal shells are respectively the positive pole and the negative pole of the cell, and the two metal shells are sealed by compressing the insulating part. Casing production facility drops into not much, but considers the compression ratio of insulating part to sealed influence, consequently needs improve the thickness of insulating part, but the thickness of insulating part improves and to make the space utilization rate of battery low, and two casings are mechanical seal in addition, if seal the regional atress uneven battery short circuit or weeping that leads to easily.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide an: the battery and the battery shell thereof are provided aiming at the defects of the prior art, so that the influence of an insulating part on the space utilization rate of the battery is avoided, and the battery short circuit or leakage caused by mechanical sealing is avoided.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

a battery housing, comprising:

a first housing including a first end wall and a first peripheral wall extending downwardly from a periphery of the first end wall;

a second housing including a second end wall and a second peripheral wall extending upwardly from a periphery of the second end wall;

the first shell and the second shell are welded or fused, and a through hole is formed in the first shell or the second shell;

an electrode terminal passing through the through hole and fixed to the first end wall or the second end wall provided with the through hole in an insulated manner;

and a first insulator disposed between the electrode terminal and the first end wall or the second end wall where the through hole is disposed, for fixing the electrode terminal to the first end wall or the second end wall.

Further, the diameter of the first peripheral wall is equal to that of the second peripheral wall, and the first peripheral wall and the second peripheral wall are welded.

Further, the welding structure further comprises a second insulator, and the second insulator covers the welding position of the first peripheral wall and the second peripheral wall.

The insert covers the second insulator, and is bonded to the first shell and the second shell through the second insulator.

Furthermore, the insert is of a cylindrical structure, and the second insulator is sleeved with the insert.

Further, the insulating structure further comprises a second insulator, the second insulator is arranged between the first peripheral wall and the second peripheral wall, the second insulator is used for welding the first peripheral wall and the second peripheral wall, and the diameter of the first peripheral wall is not equal to that of the second peripheral wall.

Further, the first peripheral wall is provided with a convex part at the opening end, the diameter of the convex part is larger than that of the second peripheral wall, and the convex part is fixedly connected with the second peripheral wall; or the second peripheral wall is provided with a convex part at the opening end, the diameter of the convex part is larger than that of the first peripheral wall, and the convex part is fixedly connected with the first peripheral wall.

Further, the first shell or the second shell is provided with anti-explosion lines and/or a liquid injection hole.

Furthermore, the first shell and the second shell are internally provided with insulating glue coatings.

A battery comprises the battery shell.

The beneficial effects of the utility model reside in that: the first shell and the second shell are connected in a sealing mode in a welding or fusion mode, so that leakage of the battery due to uneven stress of the mechanical seal is avoided, and meanwhile, the mechanical seal is not used, so that the reduction of the space utilization rate of the battery due to the fact that the thickness of the insulation part is increased because of the consideration of the compression ratio of the insulation part is not needed. Since the first and second cases have the same electrical properties after being welded, the electrode terminal fixed to the case through the first insulator may form a complete current loop with the case of the battery.

Drawings

Features, advantages and technical effects of exemplary embodiments of the present invention will be described below with reference to the accompanying drawings.

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

Fig. 2 is a second schematic structural diagram of a battery according to embodiment 1 of the present invention.

Fig. 3 is a third schematic structural diagram of a battery according to embodiment 1 of the present invention.

Fig. 4 is a schematic structural diagram of a battery case according to embodiment 1 of the present invention.

Fig. 5 is a schematic structural diagram of a battery case according to embodiment 2 of the present invention.

Fig. 6 is a schematic structural diagram of a battery case according to embodiment 3 of the present invention.

Fig. 7 is a schematic structural diagram of a battery case according to embodiment 4 of the present invention.

Fig. 8 is a schematic structural diagram of a battery case according to embodiment 5 of the present invention.

Fig. 9 is a second schematic structural view of a battery case according to embodiment 5 of the present invention.

Fig. 10 is a third schematic structural view of a battery case according to embodiment 5 of the present invention.

Fig. 11 is a fourth schematic structural view of a battery case according to embodiment 5 of the present invention.

Wherein the reference numerals are as follows:

1. a battery; 2. a battery case; 21. a first housing; 211. a first end wall; 212. a first peripheral wall; 22. a second housing; 221. a second end wall; 222. a second peripheral wall; 23. an electrode terminal; 24. a first insulator; 25. a second insulator; 26. an insert; 27. a through hole; 28. a convex portion; 3. an electrode assembly; 31. a positive plate; 32. a negative plate; 33. a diaphragm; 34. a positive electrode tab; 35. a negative electrode tab; 41. anti-explosion lines; 42. a liquid injection hole; 43. a closure member.

Detailed Description

As used in the specification and in the claims, certain terms are used to refer to particular components. As one skilled in the art will appreciate, manufacturers may refer to a component by different names. The description and claims do not intend to distinguish between components that differ in name but not function. In the following description and in the claims, the terms "include" and "comprise" are used in an open-ended fashion, and thus should be interpreted to mean "include, but not limited to. "substantially" means within an acceptable error range, and a person skilled in the art can solve the technical problem within a certain error range to substantially achieve the technical effect.

Furthermore, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly and may include, for example, fixed connections, detachable connections, or integral connections; 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 according to specific situations by those skilled in the art.

The present invention will be described in further detail with reference to the accompanying drawings, but the present invention is not limited thereto.

Example 1

As shown in fig. 1 to 4, a battery 1 according to an embodiment of the present invention includes a battery case 2 and an electrode assembly 3 accommodated in the battery case 2.

The electrode assembly 3 includes a positive electrode tab 31, a negative electrode tab 32, and a separator 33, the separator 33 being disposed between the positive electrode tab 31 and the negative electrode tab 32. The positive electrode sheet 31, the negative electrode sheet 32 and the separator 33 are wound into a cylindrical winding core through a winding process, and the positive electrode tab 34 and the negative electrode tab 35 are respectively led out from the upper end face and the lower end face of the cylindrical winding core. It is understood that the cylindrical winding core may lead out a plurality of positive electrode tabs 34 and negative electrode tabs 35. Wherein, the anode tab 34 is an aluminum strip, and the cathode tab 35 is a copper nickel plating strip, a copper strip or a nickel strip. Preferably, a copper nickel plating tape is used for the negative electrode tab 35. And respectively welding an aluminum strip and a copper nickel plating strip on the empty foils of the positive plate 31 and the negative plate 32 by ultrasonic welding.

As shown in fig. 4, the battery case 2 includes a first case 21, a second case 22, an electrode terminal 23, and a first insulator 24; the first housing 21 includes a first end wall 211 and a first peripheral wall 212 extending downward from the periphery of the first end wall 211; the second housing 22 includes a second end wall 221 and a second peripheral wall 222 extending upward from the second end wall 221; the first shell 21 and the second shell 22 are welded or fused, and the first shell 21 or the second shell 22 is provided with a through hole 27; the electrode terminal 23 passes through the through hole 27 and is fixed to the first end wall 211 or the second end wall 221 provided with the through hole 27 in an insulated manner; the first insulator 24 is disposed between the electrode terminal 23 and the first end wall 211 or the second end wall 221 provided with the through hole 27, and serves to fix the electrode terminal 23 to the first end wall 211 or the second end wall 221.

The first shell 21 and the second shell 22 are hermetically connected by welding or fusing, so that leakage of the battery 1 caused by uneven stress on the mechanical seal is avoided, and the reduction of the space utilization rate of the battery 1 caused by the increase of the thickness of the insulation member in consideration of the compression ratio is avoided because the mechanical seal is not used. Since the first and

second cases

21 and 22 have the same electrical characteristics after welding, the electrode terminals 23 fixed to the cases through the first insulator 24 can constitute a complete current loop with the cases of the battery 1.

The first case 21 and the second case 22 may be made of stainless steel, the first case 21 and the second case 22 may be made of stainless steel sheets through stamping or machining, and the wall thickness of the first case 21 and the second case 22 may be adjusted according to the design of the battery 1. It is understood that the material of the first and

second cases

21 and 22 may also be aluminum alloy, copper alloy, nickel alloy, magnesium aluminum alloy or molybdenum metal. The preferred wall thickness of the first housing 21 and the second housing 22 is 0.1mm to 0.15mm. The surface of the first case 21 or the second case 22 in which the through-hole 27 is provided may be subjected to surface treatment such as passivation or nickel plating.

Illustratively, as shown in fig. 1 to 3, by providing a through hole 27 penetrating the first end wall 211 in the first case 21, the electrode terminal 23 covers the through hole 27, and the electrode terminal 23 is fixed to the first end wall 211 by the first insulator 24, the through hole 27 can be sealed, and the tab of the electrode assembly 3 can pass through the through hole 27 to be electrically connected to the electrode terminal 23, so that the electrode terminal 23 becomes a window for the electrode assembly 3 to communicate with an external circuit.

The electrode terminals 23 may have a boss shape, an i-shape, or a sheet shape. The electrode terminal 23 is formed in a boss shape or an i-shape so that the structural strength of the electrode terminal 23 can be better enhanced, and the electrode terminal 23 is prevented from being deformed and damaged when being subjected to an external force. When the electrode terminal 23 is i-shaped, the electrode terminal comprises a boss-shaped first electrode terminal 23 and a sheet-shaped second electrode terminal 23, one of the first electrode terminal 23 and the second electrode terminal 23 is arranged inside the battery 1, the other one of the first electrode terminal 23 and the second electrode terminal 23 is arranged outside the battery 1, the first electrode terminal 23 and the second electrode terminal 23 are welded through the boss to form the electrode terminal 23, a first insulator 24 is arranged between the first electrode terminal 23 and the case, a first insulator 24 is arranged between the second electrode terminal 23 and the case, the first electrode terminal 23 is fixedly connected with the case through the first insulator 24, and the second electrode terminal 23 is fixedly connected with the case through the second insulator 25.

The insulating material of the first insulator 24 includes, but is not limited to, one or more of Polystyrene (PS), polypropylene (PP), polyethylene (PE), polyester (PET), polyvinyl chloride (PVC), polyimide (PI), acrylonitrile Butadiene Styrene (ABS), polycarbonate (PC), polyamide (PA), ceramic, and polymer material. The fixing and connecting modes include but are not limited to injection molding, glue bonding, hot-press compounding, ultrasonic welding, plastic spraying curing, high-temperature sintering or high-frequency heating and other combination modes.

The electrode assembly 3 is welded to the electrode terminal 23 and the second case 22 via the positive electrode tab 34 and the negative electrode tab 35, respectively, and is electrically connected to an external circuit. The positive electrode tab 34 is joined to the electrode terminal 23 by ultrasonic welding, resistance welding or laser welding, and the negative electrode tab 35 is welded to the second end wall 221 by resistance welding or laser welding. The non-welding points of the aluminum strip and the copper nickel plating strip are subjected to insulation treatment, the treatment mode comprises thermal compounding of PP glue, pasting of insulating gummed paper or coating of insulating glue, and the aluminum strip can be prevented from contacting the battery shell 2 to cause short circuit through the insulation treatment, or the copper nickel plating strip is prevented from contacting the positive plate 31 to cause short circuit. It is understood that the positive electrode tab 34 and the negative electrode tab 35 may also be obtained by cutting the empty foils of the positive electrode sheet 31 and the negative electrode sheet 32, respectively.

Preferably, the diameter of the first peripheral wall 212 is equal to the diameter of the second peripheral wall 222, and the first peripheral wall 212 is welded to the second peripheral wall 222. The first casing 21 and the second casing 22 are open and opposite to each other, and since the diameters of the first peripheral wall 212 and the second peripheral wall 222 are equal, the open ends of the first peripheral wall 212 and the second peripheral wall 222 abut against each other to form a tight clearance fit, and the abutting areas are welded by laser while the protective gas is supplied to rapidly cool the battery 1, so that the first peripheral wall 212 and the second peripheral wall 222 are welded and fixed together.

Preferably, the first casing 21 or the second casing 22 is provided with an explosion-proof line 41 and/or a liquid injection hole 42.

The explosion-proof line 41 is a groove formed by laser etching or punching the inner surface or the outer surface of the cover body, the shape of the explosion-proof line 41 includes but is not limited to a C shape, an S shape, a V shape, an X shape and an O shape, the depth of the explosion-proof line 41 can be adjusted according to the capacity of the battery 1, and the preferred depth of the explosion-proof line 41 is 25-35 μm. Because the casing thickness attenuation of explosion-proof line 41 department makes intensity descend, when battery 1 takes place the thermal runaway, the increase of internal pressure produces a large amount of gas and leads to internal pressure to sharply increase, and the casing is preferred to be broken from explosion-proof line 41, forms the gas escape of pressure release passageway with inside, prevents battery 1 further thermal runaway, has improved battery 1's security.

When the closed end is formed, the first case 21 and/or the second case 22 is integrated with the injection hole 42 to facilitate injection of the electrolyte. The opening is formed without providing a pouring port in the first casing 21 or the second casing 22. The battery 1 injects liquid into the battery 1 through a liquid injection port of the battery shell 2, and after the liquid injection, residual electrolyte in the liquid injection port is removed in a wiping mode, so that a laser cleaning process can be added optionally. Next, the liquid inlet of the battery 1 was sealed by laser welding a sealing sheet. After the liquid inlet was sealed, the battery 1 was allowed to stand to sufficiently soak the electrolyte, and the formation step, the volume separation step, the OCV step, and the dimension inspection step were started.

Preferably, the first casing 21 and the second casing 22 are internally provided with insulating glue coatings. Since the first casing 21 and the second casing 22 are made of metal materials, the insulating glue coating layer is disposed inside the first casing 21 and the second casing 22, so as to prevent the short circuit caused by the positive electrode tab 34 damaged by the insulating layer touching the casings.

Example 2

As shown in fig. 5, the battery case 2 of the present embodiment further includes a second insulator 25 on the basis of embodiment 1, and the second insulator 25 covers the welding position of the first peripheral wall 212 and the second peripheral wall 222. In the specific embodiment, the second insulator 25 is formed by applying a reactive curing adhesive to the weld joint by dispensing. The second insulator 25 protects the weld joint from leakage and corrosion of the weld joint from the outside.

The other structures are the same as those of embodiment 1, and are not described again here.

Example 3

As shown in fig. 6, in addition to embodiment 2, the battery case 2 of the present embodiment further includes an insert 26, the insert 26 covers the second insulator 25, and the insert 26 is adhered to the first case 21 and the second case 22 through the second insulator 25.

Preferably, the insert 26 has a cylindrical shape, and the insert 26 is sleeved on the second insulator 25.

The second insulator 25 is sleeved with the insert 26, so that the second insulator 25 can be prevented from being scraped and falling off in the process of carrying and using the battery 1.

The other structures are the same as those of embodiment 2, and are not described herein.

Example 4

As shown in fig. 7, unlike embodiment 1, the battery case 2 of the present embodiment further includes a second insulator 25, the second insulator 25 is disposed between the first peripheral wall 212 and the second peripheral wall 222, the second insulator 25 is used to fuse the first peripheral wall 212 and the second peripheral wall 222, and the diameter of the first peripheral wall 212 is not equal to the diameter of the second peripheral wall 222.

There are two situations in this embodiment where the diameters of the first peripheral wall 212 and the second peripheral wall 222 are not equal: the first is that the outer diameter of the first peripheral wall 212 is smaller than the inner diameter of the second peripheral wall 222; second, the outer diameter of the second peripheral wall 222 is smaller than the inner diameter of the first peripheral wall 212. In the first case, as shown in fig. 7, the outer diameter of the first peripheral wall 212 is smaller than the inner diameter of the second peripheral wall 222, so that a part of the first peripheral wall 212 is embedded into the second peripheral wall 222, the open end of the first peripheral wall 212 abuts against the second end wall 221 of the second shell 22, molten solidified glue is injected between the embedded part of the first peripheral wall 212 and the second peripheral wall 222, the solidified glue is cooled to form the second insulator 25, and the second insulator 25 is used for connecting the first peripheral wall 212 and the second peripheral wall 222, so as to seal the first shell 21 and the second shell 22. The leakage of the battery 1 due to uneven stress on the mechanical seal is avoided, and the thickness does not need to be increased by considering the compression ratio of the second insulator 25 because the mechanical seal is not used.

Example 5

As shown in fig. 8 and 9, unlike embodiment 1, the first peripheral wall 212 of the present embodiment is provided with a projection 28 at the opening end, the inner diameter of the projection 28 is larger than the outer diameter of the second peripheral wall 222, and the projection 28 is fixedly connected to the second peripheral wall 222; alternatively, as shown in fig. 10 and 11, the second peripheral wall 222 is provided with a projection 28 at the opening end, the inner diameter of the projection 28 is larger than the outer diameter of the first peripheral wall 212, and the projection 28 is fixedly connected to the first peripheral wall 212.

The fixed connection of the projection 28 to the first peripheral wall 212 is by welding or bonding via the second insulator 25.

As shown in fig. 8, the second peripheral wall 222 is partially fitted into the projection 28, the projection 28 is welded to the second peripheral wall 222 by laser welding, and a protective gas is supplied while welding so that the battery 1 is rapidly cooled.

As shown in fig. 9, the second peripheral wall 222 is partially embedded in the protrusion 28, a gap is formed between the second peripheral wall 222 and the protrusion 28, a molten solidified glue is injected between the embedded portion of the second peripheral wall 222 and the protrusion 28, the solidified glue is cooled to form the second insulator 25, and the second insulator 25 is used for connecting the second peripheral wall 222 and the protrusion 28, so as to seal the first shell 21 and the second shell 22.

As shown in fig. 10, the first peripheral wall 212 is partially embedded in the projection 28, the projection 28 is welded to the first peripheral wall 212 by laser welding, and the protective gas is supplied while welding so that the battery 1 is rapidly cooled.

As shown in fig. 11, the first peripheral wall 212 is partially embedded in the protrusion 28, and a gap exists between the first peripheral wall 212 and the protrusion 28, a molten solidification paste is injected between the embedded portion of the first peripheral wall 212 and the protrusion 28, the solidification paste is cooled to form the second insulator 25, and the second insulator 25 is used for connecting the first peripheral wall 212 and the protrusion 28, so as to seal the first shell 21 and the second shell 22.

The two fixing connection modes avoid the leakage of the battery 1 caused by uneven stress of the mechanical seal, and simultaneously, the thickness of the battery does not need to be increased by considering the compression ratio of the second insulator 25 because the mechanical seal is not used.

Variations and modifications to the above-described embodiments may become apparent to those skilled in the art from the disclosure and teachings of the above description. Therefore, the present invention is not limited to the above-mentioned embodiments, and any obvious modifications, replacements or variations made by those skilled in the art on the basis of the present invention belong to the protection scope of the present invention. Furthermore, although specific terms are employed herein, they are used in a generic and descriptive sense only and not for purposes of limitation.

Claims

1. A battery case, comprising:

a first housing (21) including a first end wall (211) and a first peripheral wall (212) extending downward from a periphery of the first end wall (211);

a second housing (22) including a second end wall (221) and a second peripheral wall (222) extending upward from the second end wall (221);

the first shell (21) and the second shell (22) are welded or fused, and the first shell (21) or the second shell (22) is provided with a through hole (27);

an electrode terminal (23) that passes through the through-hole (27) and is fixed in an insulated manner to the first end wall (211) or the second end wall (221) provided with the through-hole (27);

a first insulator (24) disposed between the electrode terminal (23) and the first end wall (211) or the second end wall (221) in which the through hole (27) is disposed, for fixing the electrode terminal (23) to the first end wall (211) or the second end wall (221).

2. The battery housing according to claim 1, wherein the first peripheral wall (212) has a diameter equal to a diameter of the second peripheral wall (222), the first peripheral wall (212) being welded to the second peripheral wall (222).

3. The battery case according to claim 2, further comprising a second insulator (25), the second insulator (25) covering a welding position of the first peripheral wall (212) and the second peripheral wall (222).

4. The battery case according to claim 3, further comprising an insert (26), wherein the insert (26) covers the second insulator (25), and wherein the insert (26) is bonded to the first case (21) and the second case (22) through the second insulator (25).

5. The battery case according to claim 4, wherein the insert (26) is cylindrical in shape, and the insert (26) is fitted over the second insulator (25).

6. The battery case according to claim 1, further comprising a second insulator (25), the second insulator (25) being disposed between the first peripheral wall (212) and the second peripheral wall (222), the second insulator (25) being for fusing the first peripheral wall (212) and the second peripheral wall (222), a diameter of the first peripheral wall (212) being not equal to a diameter of the second peripheral wall (222).

7. The battery housing according to claim 1, wherein the first peripheral wall (212) is provided with a protrusion (28) at an open end, the protrusion (28) having a diameter larger than a diameter of the second peripheral wall (222), the protrusion (28) being fixedly connected to the second peripheral wall (222); or the second peripheral wall (222) is provided with a convex part (28) at the opening end, the diameter of the convex part (28) is larger than that of the first peripheral wall (212), and the convex part (28) is fixedly connected with the first peripheral wall (212).

8. The battery case according to claim 1, characterized in that the first case (21) or the second case (22) is provided with an explosion-proof thread (41) and/or a liquid injection hole (42).

9. The battery case according to claim 1, wherein the first case (21) and the second case (22) are internally provided with an insulating paste coating.

10. A battery, characterized in that it comprises a battery housing (2) according to any one of claims 1 to 9.