CN213845368U

CN213845368U - Winding battery and battery case

Info

Publication number: CN213845368U
Application number: CN202120070118.7U
Authority: CN
Inventors: 石金林; 张宝华; 孙光忠; 刘勇; 彭雪刚; 周佩; 丁慧
Original assignee: Camel Group Wuhan New Energy Technology Co ltd
Current assignee: Camel Group New Energy Battery Co Ltd
Priority date: 2021-01-12
Filing date: 2021-01-12
Publication date: 2021-07-30
Anticipated expiration: 2031-01-12

Abstract

The utility model provides a winding battery shell and a winding battery; the battery shell comprises a shell body, a positive pole top cover and a negative pole top cover; openings are formed in the two ends of the shell, and the positive electrode top cover and the negative electrode top cover are respectively connected to the two opening ends of the shell in a butt joint mode; the cathode top cover and the anode top cover comprise top cover plates, corresponding cathode posts and anode posts are arranged on the top cover plates of the cathode top cover and the anode top cover, the sectional areas of the cathode posts and the anode posts account for more than 25% of the surface area of the top cover plates of the cathode top cover and the anode top cover, post mounting holes are formed in the top cover plates of the cathode top cover and the anode top cover, insulating ceramic plates are arranged between the cathode posts and the corresponding post mounting holes, plastic parts are fixed on the inner sides of the top cover plates of the cathode top cover and the anode top cover, convex bags used for fixing and limiting the internal flexible connection of the battery protrude outwards from the upper end parts and the lower end parts of the plastic parts, and abdicating holes used for abdicating the corresponding posts are formed in the middle parts; the high-current charging and discharging capacity of the lithium ion battery is greatly improved, and the problem of over-high battery temperature caused by insufficient pole overcurrent capacity of the battery is obviously solved.

Description

Winding battery and battery case

Technical Field

The utility model belongs to the technical field of casing lithium ion battery makes and specifically relates to a winding battery and battery case are related to.

Background

At present, a shell battery is generally formed by arranging a positive electrode lug and a negative electrode lug on the same end face of the battery, namely the positive electrode lug and the negative electrode lug of the battery are arranged on the same side of the battery, the width of a positive electrode column and the width of a negative electrode column are limited by the design, the overcurrent sectional area of the positive electrode column and the overcurrent sectional area of the negative electrode column are further limited, the overcurrent capacity of the battery is limited, and the requirement of a high-power battery cannot be met.

Disclosure of Invention

An object of the utility model is to provide a solve above-mentioned prior art not enough to a coiling battery case is provided, lithium ion battery's heavy current charge and discharge ability is greatly promoted, obviously improves the battery because of the not enough too high problem of battery temperature rise that leads to of utmost point post overcurrent capacity, has stopped the battery just, the negative pole is owing to the short circuit risk that leads to at same auris laterals.

The utility model aims at providing a coiling battery who uses above-mentioned shell to make still.

A winding battery shell comprises a shell body, a positive pole top cover and a negative pole top cover; openings are formed in the two ends of the shell, and the positive electrode top cover and the negative electrode top cover are respectively connected to the two opening ends of the shell in a butt joint mode; negative pole top cap, positive pole top cap includes the top cap piece, just, the negative pole post that corresponds is equipped with on the top cap piece of negative pole top cap, positive post, and just, the sectional area of negative pole post accounts for just corresponding, more than 25% of the top cap piece surface area of negative pole top cap, the utmost point post mounting hole has been seted up on the top cap piece of positive pole top cap, just, be equipped with insulating ceramic wafer between negative pole post and the utmost point post mounting hole that corresponds, just, the top cap piece inboard of negative pole top cap is fixed with the working of plastics, on the working of plastics, the outside protrusion in lower both ends has the protruding package that is used for fixed and spacing battery inside soft connection, the hole of stepping down that is used for stepping down corresponding utmost point post is seted up at the middle part.

The shell is of a cuboid tubular structure formed by bending an aluminum alloy or steel shell.

The wall thickness of the shell is 0.1mm-1.5 mm.

The positive top cover and the negative top cover are in tight fit butt joint with the two opening ends of the shell.

The negative electrode top cover is provided with an explosion-proof valve and a liquid injection hole, and the diameter of the liquid injection hole is 1mm-10 mm.

And four corners of the positive pole and the negative pole are in fillet transition.

The plastic pieces on the inner sides of the top cover pieces of the positive and negative pole top covers have the length of-d 1 and the width of-d 2; d1 is 0.5-1mm, d2 is 0.5-1 mm.

The top cover pieces of the positive and negative electrode top covers are made of the same material as the shell, and the thickness of the top cover pieces is 0.1mm-2.5 mm.

A winding battery comprises a winding battery cell and a battery shell in the technical scheme, wherein the winding battery cell is arranged in the battery shell, a positive lug and a negative lug of the winding battery cell are respectively welded with a positive pole soft connection and a negative pole soft connection correspondingly, the other end of the positive pole soft connection is welded with the inner end face of a positive pole column, and the other end of the negative pole soft connection is welded with the inner end face of a negative pole column.

The beneficial effects of the utility model reside in that: compare with current casing and top cap, the utility model discloses a battery is through establishing just, the negative pole post respectively at the relative both ends face of battery, makes just, the sectional area ratio of negative pole ear has increased 1.2-3.1 times when the unilateral design, and this also means the utility model discloses a utmost point ear, its overcurrent capacity have promoted about 1.2-3.1 times, can select to correspond the design of size sectional area according to specific overcurrent demand to this heavy current that satisfies the battery fills the charge-discharge demand. The utility model provides a positive negative pole area is because the structure and the problem by the restriction, is showing the ability of overflowing that has promoted the battery top cap, makes its power type battery that more is fit for the heavy current and fills and discharge. And simultaneously, the utility model discloses because the separation of positive, negative pole post, stopped the battery just, the negative pole is owing to the short circuit risk that leads to at same auricle, compares traditional casing top cap moreover, has still simplified the inboard working of plastics structure of top cap, no longer need use rather than complex insulating support, further simplified battery inner structure, simplified the inside mechanism design of electricity core, and then reduced casing battery's the manufacturing degree of difficulty.

Drawings

FIG. 1 is a schematic structural view of the casing, the positive and negative caps of the present invention after being welded in a matching manner;

FIG. 2 is a front view of the combined housing and cover of the present invention;

fig. 3 is a front view of the negative electrode top cap;

fig. 4 is a side view of the negative cap;

fig. 5 is a rear view of the negative cap;

FIG. 6 is a front view of the positive top cover;

FIG. 7 is a side view of the positive top cap;

FIG. 8 is a rear view of the positive header;

FIG. 9 is a cross-sectional schematic view of a battery;

in the figure: 1. the battery comprises a shell, 2, a negative pole top cover, 201, a negative pole top cover plate, 202, a liquid injection hole, 203, a negative pole column, 204, an explosion-proof valve, 205, a negative pole plastic piece, 206, a negative pole column inner end face, 3, a positive pole top cover, 301, a positive pole top cover plate, 302, a positive pole column, 303, a positive pole plastic piece, 304, a positive pole column inner end face, 4, a negative pole soft connection, 5, a positive pole soft connection, 6 and a winding battery core.

Detailed Description

The technical solution in the embodiments of the present invention will now be clearly and completely described with reference to the accompanying drawings, which are simplified schematic drawings and only schematically illustrate the basic structure of the present invention.

It should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the referred devices or elements must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.

As shown in fig. 1 and 2, the present invention includes a housing 1, a negative top cap 2, and a positive top cap 3; the shell 1 is of a structure with two open ends, and the anode top cover 3 and the cathode top cover 2 are correspondingly butted on the two open ends of the shell 1; the shell body is in a cuboid shape by surrounding four sides, the other two opposite sides are provided with openings, the whole shell is in a cylindrical shape, the wall thickness of the shell is 0.5-1.5 mm, and the shell is made of aluminum alloy (without limiting the grade) or steel shell (without limiting the type of steel); the negative electrode top cover 2 and the positive electrode top cover 3 are respectively butted with two openings of the shell 1, the negative electrode top cover 2 and the positive electrode top cover 3 are closed to form a closed cuboid, the negative electrode top cover 2 is butted with the openings of the shell 1 in a tight fit mode, and the positive electrode top cover 3 is butted with the openings of the shell 1 in a tight fit mode.

As shown in fig. 3, 4 and 5, the negative top cover 2 includes a negative top cover sheet 201, a negative pole column 203, and a liquid injection hole 202 and an explosion-proof valve 204 distributed on the top cover sheet, the cross-sectional area of the negative pole column 203 accounts for more than 25% of the surface area of the negative top cover sheet 201, and a negative plastic piece 205 is fixed on the inner side of the negative top cover sheet 201 to ensure that the flow cross-sectional area is large enough; convex hulls used for fixing and limiting the internal flexible connection of the battery are protruded outwards from the upper end part and the lower end part of the plastic part, and a abdicating hole used for abdicating the corresponding pole is formed in the middle part of the plastic part; the material of the negative top cover sheet 201 is the same as that of the shell 1. The thickness can be any one of 0.4mm-2.5mm according to the design requirement of the battery. The diameter of the liquid injection hole 202 is 1mm-10mm, and can be determined by the size of the battery and the amount of liquid injection. Wherein, explosion-proof valve satisfies the safe blasting requirement of battery, for example: the internal pressure of the battery is generally required to be less than or equal to 0.6Mpa for no explosion, and the explosion-proof valve is required to be opened for pressure relief more than 0.6 Mpa.

As shown in fig. 6, 7 and 8, the positive top cover 3 includes a positive post 302 and a positive top cover plate 301, and the positive top cover plate 301 is made of the same material as the housing 1. The thickness can be any one of 0.4mm-2.5mm according to the design requirement of the battery, and the sectional area of the positive pole column 302 accounts for more than 25% of the surface area of the positive pole top cover plate 301 so as to ensure that the overcurrent sectional area is large enough; the positive pole top cover plate 301 inboard is fixed with anodal working of plastics 303, and the outside protrusion in upper and lower both ends of working of plastics has the convex closure that is used for fixed and spacing battery inside flexible coupling, and the hole of stepping down that is used for stepping down corresponding utmost point post is seted up at the middle part.

The sealing mode of the negative electrode top cover 2 and the positive electrode top cover 3 with the two openings of the shell 1 is laser welding.

And insulating ceramic plates are arranged between the positive pole and the negative pole and the corresponding pole mounting holes, and insulation is achieved by blocking of the insulating ceramic plates.

The plastic pieces on the inner sides of the top cover pieces of the positive and negative pole top covers have the length of-d 1 and the width of-d 2; d1 is 0.5-1mm, d2 is 0.5-1 mm. The working of plastics thickness is confirmed according to inside naked electric core utmost point ear and the design of flexible coupling structure, and the working of plastics need fix and restrict utmost point ear and the flexible coupling after folding in principle.

As shown in fig. 9, the positive and negative electrode tabs of the winding cell 6 are first connected to the positive flexible connection 5 and the negative flexible connection 4 by welding, and then the negative electrode top cap 2 is connected to the other end of the negative flexible connection 4 by welding, and the negative electrode top cap 3 is connected to the other end of the positive flexible connection 5 by welding; and then the positive and negative flexible connections are respectively folded, so that the positive and negative top covers are respectively combined with the shell in a butt joint manner, the folded flexible connections are positioned through plastic parts, and then welding and sealing are carried out, and a battery main body is formed.

The present invention is not limited to the above specific embodiments, and those skilled in the art can make various changes without creative labor from the above conception, and all the changes fall within the protection scope of the present invention.

Claims

1. A wound battery case, characterized by: comprises a shell (1), a positive top cover (3) and a negative top cover (2); openings are formed in the two ends of the shell (1), and the positive electrode top cover (3) and the negative electrode top cover (2) are respectively butted on the two opening ends of the shell (1); negative pole top cap (2), anodal top cap (3) are including the top cap piece, just, be equipped with corresponding negative pole post (203) on the top cap piece of negative pole top cap, anodal post (302), and just, the sectional area of negative pole post accounts for just corresponding, more than 25% of the top cap piece surface area of negative pole top cap, negative pole top cap (2), the utmost point post mounting hole has been seted up on the top cap piece of positive pole top cap (3), just, be equipped with insulating ceramic wafer between negative pole post and the utmost point post mounting hole that corresponds, just, the top cap piece inboard of negative pole top cap is fixed with the working of plastics, on the working of plastics, the outside protrusion in both ends has the convex closure that is used for fixed and spacing battery inside soft coupling down, the hole of stepping down that is used for stepping down to correspond utmost point post is seted up to the middle part.

2. A wound battery casing according to claim 1, characterised in that: the shell (1) is of a cuboid tubular structure formed by bending an aluminum alloy or steel shell.

3. A wound battery casing according to claim 1 or 2, characterised in that: the wall thickness of the shell (1) is 0.1mm-1.5 mm.

4. A wound battery casing according to claim 1, characterised in that: the anode top cover (3) and the cathode top cover (2) are in close fit butt joint with two open ends of the shell (1).

5. A wound battery casing according to claim 1 or 4, characterised in that: the negative pole top cap (2) is provided with an explosion-proof valve (204) and a liquid injection hole (202), and the diameter of the liquid injection hole (202) is 1mm-10 mm.

6. A wound battery casing according to claim 1, characterised in that: and four corners of the positive pole and the negative pole are in fillet transition.

7. A wound battery casing according to claim 1, characterised in that: the plastic pieces on the inner sides of the top cover pieces of the positive and negative pole top covers have the length of-d 1 and the width of-d 2; d1 is 0.5-1mm, d2 is 0.5-1 mm.

8. A wound battery casing according to claim 7, characterised in that: the top cover pieces of the positive and negative electrode top covers are made of the same material as the shell (1), and the thickness of the top cover pieces is 0.1mm-2.5 mm.

9. A wound battery, characterized in that: the battery comprises a winding battery cell (6) and the battery shell as claimed in any one of claims 1 to 8, wherein the winding battery cell (6) is arranged in the battery shell, a positive electrode lug and a negative electrode lug of the winding battery cell (6) are respectively welded with a positive electrode soft connection and a negative electrode soft connection correspondingly, the other end of the positive electrode soft connection (5) is welded with an inner end face (304) of a positive electrode column, and the other end of the negative electrode soft connection (4) is welded with an inner end face (206) of a negative electrode column.