CN212967762U

CN212967762U - Winding type battery cell

Info

Publication number: CN212967762U
Application number: CN202021726479.4U
Authority: CN
Inventors: 冯超聪; 汤伟; 黄云国; 谭永星
Original assignee: Dongguan Mangrove New Energy Co ltd
Current assignee: Dongguan Mangrove New Energy Co ltd
Priority date: 2020-08-18
Filing date: 2020-08-18
Publication date: 2021-04-13
Anticipated expiration: 2030-08-18

Abstract

The utility model discloses a coiled electrical core, which comprises a shell and an electrical core, wherein the upper end surface and the lower end surface of the shell are respectively provided with a top cover and a bottom cover, the lower end surface of the top cover is fixedly provided with a top gasket, and the upper end surface of the bottom cover is fixedly provided with a bottom gasket; the battery core comprises a first insulating diaphragm, a first pole piece, a second insulating diaphragm and a second pole piece which are sequentially laminated from outside to inside, wherein the first pole piece and the second pole piece are respectively electrically connected with a first pole lug and a second pole lug; the utility model discloses reduced the charge-discharge resistance, realized that high magnification charge-discharge and heat dispersion are good, promoted the security performance simultaneously.

Description

Winding type battery cell

Technical Field

The utility model relates to a secondary battery technical development field, concretely relates to is a coiling type electricity core.

Background

The battery cell refers to a single electrochemical cell containing a positive electrode and a negative electrode, is not generally used directly, is different from a battery containing a protection circuit and a shell, and can be used directly. Along with the continuous improvement of people's requirement for the battery, the structure of electricity core is also continuous improvement, however current coiling formula electricity core adopts the structure of integral type more, can wholly scrap when the electricity core takes place to damage, can not realize the cyclic utilization of the undamaged part above that, increases electric core maintenance manufacturing cost, and the electrolyte on the current coiling formula electricity core mainly fills in between positive negative pole board, has increased the risk of electrolysis leakage, has reduced electric core safety in utilization.

SUMMERY OF THE UTILITY MODEL

In order to overcome the not enough of prior art scheme, the utility model provides a coiling type electricity core can the effectual problem that the solution background art provided.

The utility model provides a technical scheme that its technical problem adopted is: a winding type battery cell comprises a shell and a battery cell, wherein a top cover and a bottom cover are respectively arranged on the upper end surface and the lower end surface of the shell, a top gasket is fixedly arranged on the lower end surface of the top cover, a bottom gasket is fixedly arranged on the upper end surface of the bottom cover, and a PVC sleeve is fixedly arranged on the peripheral side wall of the shell; the battery cell comprises a first insulating diaphragm, a first pole piece, a second insulating diaphragm and a second pole piece which are stacked from outside to inside in sequence, wherein a plurality of supporting protrusions with the same orientation are uniformly arranged on the first insulating diaphragm and the second insulating diaphragm at intervals, the first pole piece and the second pole piece are respectively electrically connected with a first pole lug and a second pole lug, the first pole piece comprises a first current collector and a first active substance arranged on the surface of the first current collector, the second pole piece comprises a second current collector and a second active substance arranged on the surface of the second current collector, a first conductive coating is fixedly arranged on the first pole piece, and a second conductive coating is fixedly arranged on the second pole piece.

As a further elaboration, the casing encloses the cell, which is formed by winding a roll core tape.

As a further elaboration, the first pole piece is a positive pole piece, and the second pole piece is a negative pole piece.

As a further elaboration, the top cover is connected with the top gasket in a clamping and pressing manner, and the bottom cover is connected with the bottom gasket in a clamping and pressing manner.

As a further elaboration, buffer layers are fixedly arranged on the surfaces of the first insulating diaphragm and the second insulating diaphragm; the thickness of buffer layer is 1-30 um.

As a further elaboration, the top cover and the bottom cover are connected with the shell in a clamping and pressing mode.

As a further elaboration, the first conductive coating is an aluminum foil layer and the second conductive coating is a copper foil layer.

As a further elaboration, both ends of the inner surface and both ends of the outer surface of the second pole piece have a blank area.

Compared with the prior art, the beneficial effects of the utility model are that: the utility model discloses reduced the charge-discharge resistance, realized that high magnification charges and discharges and heat dispersion is good, promoted the security performance simultaneously; the first pole piece is fixedly provided with a first conductive coating, and the second pole piece is fixedly provided with a second conductive coating, so that high-rate charge and discharge can be realized, and the resistance value during charge and discharge can be effectively reduced; when short circuit occurs inside the battery cell, the heat can be quickly dissipated to the shell through the first conductive coating and the second conductive coating, and the situations of combustion and explosion caused by high-temperature chemical reaction of the first pole piece and the second pole piece are improved; when the whole battery cell is formed by winding, due to the supporting effect of the supporting bulges, the electrolyte can be well contacted with the first pole piece, the first active substance and the second active substance of the second pole piece of each layer through the gap brought by the supporting bulges; in addition, the supporting bulge also has a liquid storage function, and when electrolyte is poured into the supporting bulge, a large amount of electrolyte can be absorbed, so that the risk of electrolytic leakage is reduced, and the use safety of the battery cell is improved.

Drawings

Fig. 1 is a schematic view of an overall structure of a winding type battery cell of the present invention;

fig. 2 is a partial cross-sectional view of a wound cell of the present invention;

fig. 3 is a bottom view of the winding type electrical core of the present invention.

Reference numbers in the figures: 1. a housing; 2. an electric core; 3. a top cover; 4. a bottom cover; 5. a top gasket; 6. a bottom gasket; 7. PVC sleeves; 8. a first insulating diaphragm; 9. a first pole piece; 10. a second insulating diaphragm; 11. a second pole piece; 12. a support boss; 13. a first tab; 14. a second tab; 15. a first current collector; 16. a first active material; 17. a second current collector; 18. a second active substance; 19. a first conductive coating; 20. a second conductive coating; 21. a buffer layer.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

As shown in fig. 1-3, a winding type battery cell 2 includes a casing 1 and a battery cell 2, a top cover 3 and a bottom cover 4 are respectively disposed on an upper end surface and a lower end surface of the casing 1, a top gasket 5 is fixedly mounted on a lower end surface of the top cover 3, a bottom gasket 6 is fixedly mounted on an upper end surface of the bottom cover 4, and a PVC casing 7 is fixedly disposed on a peripheral side wall of the casing 1; electric core 2 includes from outside to inside laminated first insulation diaphragm 8, first pole piece 9, the insulating diaphragm 10 of second and second pole piece 11 of order, equal even interval is equipped with a plurality of support archs 12 that the orientation is the same on first insulation diaphragm 8 and the insulating diaphragm 10 of second, first pole piece 9 is connected with first utmost point ear 13 and second utmost point ear 14 with second pole piece 11 electricity respectively, first pole piece 9 includes first mass of current body 15 and sets up in the first active material 16 on the first mass of current body 15 surface, second pole piece 11 includes the second mass of current body 17 and sets up the second active material 18 on the second mass of current body 17 surface, still fixed first conductive coating 19 that is equipped with on the first pole piece 9, still fixed second conductive coating 20 that is equipped with on the second pole piece 11.

Preferably, the battery cell 2 includes a first insulating diaphragm 8, a first pole piece 9, a second insulating diaphragm 10, and a second pole piece 11, which are sequentially stacked from outside to inside, and the second pole piece 11, the second insulating diaphragm 10, the first pole piece 9, and the first insulating diaphragm 8 are wound counterclockwise, so that the first diaphragm far away from the second pole piece 11 in the stacking thickness direction is located on the inside and wound to obtain the battery cell 2.

Preferably, a first conductive coating 19 is further fixedly arranged on the first pole piece 9, and a second conductive coating 20 is further fixedly arranged on the second pole piece 11, so that high-rate charge and discharge can be realized, and the resistance value during charge and discharge can be effectively reduced; when a short circuit occurs inside the battery cell 2, the first conductive coating 19 and the second conductive coating 20 can quickly dissipate heat to the housing 1, so that the situations that the first pole and the second pole 11 are burnt and exploded due to high-temperature chemical reaction are improved.

Preferably, the first conductive coating 19 is an aluminum foil layer, and the second conductive coating 20 is a copper foil layer, since the aluminum foil layer and the copper foil layer have good conductivity and soft texture, and both can form an oxide protective film on the surface.

Preferably, the buffer layers 21 are fixedly arranged on the surfaces of the first insulating diaphragm 8 and the second insulating diaphragm 10, so that the diaphragms in the electric core 2 are effectively buffered, and the use safety of the electric core 2 is improved.

Preferably, the first pole piece 9 includes a first current collector 15 and a first active material 16 disposed on a surface of the first current collector 15, the second pole piece 11 includes a second current collector 17 and a second active material 18 disposed on a surface of the second current collector 17, and the first active material 16 and the second active material 18 are the same as the active materials on the pole plate of the general winding type battery cell 2, and can be used to implement charging and discharging of the battery cell 2.

Preferably, the top cover 3 and the bottom cover 4 are connected with the casing 1 in a clamping and pressing manner, so that when the battery cell 2 is damaged, the casing 1 can be reused, and the maintenance and production cost of the battery cell 2 is saved.

Preferably, both ends of the inner surface and both ends of the outer surface of the second pole piece 11 have a blank area, and the blank areas are used for preventing the second conductive coating 20 coated on the inner surface and the outer surface of the second pole piece 11 from falling off in the winding process due to the requirement of the manufacturing process.

Preferably, a plurality of supporting protrusions 12 with the same orientation are uniformly arranged on each of the first insulating diaphragm 8 and the second insulating diaphragm 10 at intervals, and when the whole battery core 2 is wound and molded, due to the supporting function of the supporting protrusions 12, the electrolyte can be well contacted with the first active material 16 and the second active material 18 of the first pole piece 9 and the second pole piece 11 of each layer through the gap caused by the supporting protrusions 12; in addition, the support protrusion 12 also has a liquid storage function, when electrolyte is poured, a large amount of electrolyte can be absorbed, and the electrolyte can be continuously discharged by pressing in the subsequent use, so that the thickness of the battery can be reduced in the manufacturing process.

Preferably, the shell 1 wraps the battery cell 2, and the battery cell 2 is formed by winding a roll core tape; the first pole piece 9 is a positive pole piece, and the second pole piece 11 is a negative pole piece; the top cover 3 is connected with the top gasket 5 in a clamping and pressing mode, and the bottom cover 4 is connected with the bottom gasket 6 in a clamping and pressing mode; buffer layers 21 are fixedly arranged on the surfaces of the first insulating diaphragm 8 and the second insulating diaphragm 10; the thickness of the buffer layer 21 is 1-30 um.

It is obvious to a person skilled in the art that the invention is not restricted to details of the above-described exemplary embodiments, but that it can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned. Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.

Claims

1. The utility model provides a coiling formula electricity core which characterized in that: the battery comprises a shell and a battery cell, wherein a top cover and a bottom cover are respectively arranged on the upper end surface and the lower end surface of the shell, a top gasket is fixedly arranged on the lower end surface of the top cover, a bottom gasket is fixedly arranged on the upper end surface of the bottom cover, and a PVC sleeve is fixedly arranged on the peripheral side wall of the shell; the battery cell comprises a first insulating diaphragm, a first pole piece, a second insulating diaphragm and a second pole piece which are stacked from outside to inside in sequence, wherein a plurality of supporting protrusions with the same orientation are uniformly arranged on the first insulating diaphragm and the second insulating diaphragm at intervals, the first pole piece and the second pole piece are respectively electrically connected with a first pole lug and a second pole lug, the first pole piece comprises a first current collector and a first active substance arranged on the surface of the first current collector, the second pole piece comprises a second current collector and a second active substance arranged on the surface of the second current collector, a first conductive coating is fixedly arranged on the first pole piece, and a second conductive coating is fixedly arranged on the second pole piece.

2. A wound cell according to claim 1, wherein: the casing is wrapping up the electricity core, the electricity core is coiled by rolling up the core area and is constituted.

3. A wound cell according to claim 1, wherein: the first pole piece is a positive pole piece, and the second pole piece is a negative pole piece.

4. A wound cell according to claim 1, wherein: the top cover is connected with the top gasket in a clamping and pressing mode, and the bottom cover is connected with the bottom gasket in a clamping and pressing mode.

5. A wound cell according to claim 1, wherein: buffer layers are fixedly arranged on the surfaces of the first insulating diaphragm and the second insulating diaphragm; the thickness of buffer layer is 1-30 um.

6. A wound cell according to claim 1, wherein: the top cover and the bottom cover are connected with the shell in a clamping and pressing mode.

7. A wound cell according to claim 1, wherein: the first conductive coating is an aluminum foil layer, and the second conductive coating is a copper foil layer.

8. A wound cell according to claim 1, wherein: and both ends of the inner surface and both ends of the outer surface of the second pole piece are provided with a blank area.