CN204905358U

CN204905358U - Coiling power lithium ion battery

Info

Publication number: CN204905358U
Application number: CN201520456632.9U
Authority: CN
Inventors: 国海鹏; 马新寨; 刘双合; 田丽
Original assignee: Baoding Fengfan New Energy Co Ltd
Current assignee: Fengfan Co Ltd
Priority date: 2015-06-30
Filing date: 2015-06-30
Publication date: 2015-12-23
Anticipated expiration: 2025-06-30

Abstract

The utility model discloses a coiling power lithium ion battery, the apron outside is fixed with anodal post and negative pole post, the apron is inboard be fixed with with the welding of anodal post together the aluminium connection piece and with negative pole post welding copper connection piece together, the apron is inboard to be had and carries out the fixed column A and the B that assemble with the supporter, fixed column A and B and just, the insulation of negative pole post, on the fixed column A and fixed column B on the apron was tightly inserted to the supporter, the copper connection piece was located the constant head tank that corresponds in the backup pad, be in the same place with the negative pole utmost point ear welding of roll core, the locating hole that corresponds is worn out to the aluminium connection piece in the backup pad, be in the same place with the anodal utmost point ear welding of roll core, rolling up the core and convoluteing outside the supporter, the shell is fixed in the outside of roll core, and needle position breach department is pressed at the diaphragm of supporter to the crimping of unfamiliar top. The utility model discloses can effectively alleviate change become with the use in the deformation of electric core, long service life, safe in utilization.

Description

A kind of winding power lithium-ion battery

Technical field

The utility model relates to a kind of Wrapping type power cell, especially relates to a kind of winding power lithium-ion battery effectively can alleviated battery core and be out of shape at charge and discharge process.

Background technology

Lithium rechargeable battery has the advantages such as high-energy-density, high voltage, low self-discharge rate.Along with the day by day raising of day by day exhaustion and the environmental requirement of the primary energy such as oil, day by day ripe lithium ion battery technology starts to be applied to power drive gradually.The electric bicycle that lithium-ion-power cell drives, the existing commercially produced product such as electric motorcycle, hybrid power and pure electric automobile are also put on market.

The battery core assembling of lithium-ion-power cell mainly contains two kinds of modes at present and namely reels and lamination.Due to pole piece itself the easily feature such as generation relative movement of lithium ion battery negative electrode varied in thickness when vacuum bakeout and discharge and recharge very large (can thickening 10% ~ 25%) and battery battery core, at initial charge, namely in formation process, easily occur that battery core is out of shape, cause changing into uneven, occur analysing the phenomenons such as electric blackspot.Even if in normal use procedure, because cathode pole piece charges the thinning characteristic of thickening electric discharge, with the increase of discharge and recharge number of times, battery core deformation will be more and more serious.For winding battery, inevitably there is the pole piece problem such as wriggling and battery core arch camber in the longitudinal direction in use procedure in battery core; And for laminated batteries, then can there is thickness swelling, the change of pole piece interlamellar spacing causes pole piece to assemble loose problem.No matter be formation process or use procedure, the deformation of battery core all causes great harmful effect to the electrical property of battery, useful life and security performance.

Winding process has that automaticity is high, cost is low, production efficiency is high, pole piece gap uniformity, battery core consistency of performance are good, pole piece radius of curvature is large, pole piece not easily falls the making that the advantages such as material are widely used in electrokinetic cell, but because core is hollow, it is in formation process and use procedure, battery core distortion and thickening phenomenon more easily occur, and useful life is short.

Summary of the invention

The purpose of this utility model solves the above-mentioned problems in the prior art exactly, provides a kind of can effectively alleviation changing into the distortion with battery core in use procedure, the winding power lithium-ion battery of long service life, use safety.

For achieving the above object, technical solution of the present utility model is: a kind of winding power lithium-ion battery, and it comprises insulation crust, comprises positive plate, the core of negative plate and barrier film, insulation cover plate, insulation support body and electrolyte; Positive terminal and negative terminal is fixed with outside cover plate, the aluminium brace welded together with positive terminal and the copper brace welded together with negative terminal is fixed with inside cover plate, have fixed leg A and B carrying out with supporter assembling inside cover plate, fixed leg A and B and positive and negative pole insulate; Supporter upper end have match with each fixed leg A, fixed leg B and the copper brace on cover plate location notch, aluminium brace location hole, the other end has operating winding location hole, and left and right interposition is equipped with barrier film pressing position breach; Supporter is tightly inserted on fixed leg A on the cover board and fixed leg B, and copper brace is positioned at location notch corresponding in supporting bracket, welds together with the negative lug of core; Aluminium brace passes location hole corresponding in supporting bracket, welds together with the positive pole ear of core; Core is wound on outside supporter, and shell is fixed on the outside of core, and barrier film top is crimped on the barrier film pressing position indentation, there of supporter.

Insulation support body described above is the supporter be made up of pottery or PP/PET engineering plastics.

Supporter cross section described above be oval or two minor faces be semicircular arc like rectangle or hexagon.

The utility model also comprises current interrupt mechanism, and current interrupt mechanism is arranged on the aluminium brace in supporter.Current interrupt mechanism, when battery charge or discharge electric current is excessive, can fuse automatically, plays the effect of protection battery.

When the coiling material comprising positive plate, negative plate and barrier film is wound as core, the cover plate fitted together and supporter, as the volume pin use of winding, simplify the operation in battery Making programme, are convenient to realize automation, improve production efficiency.Because strutting piece is in the use procedure of core manufacturing process and battery, all be positioned in the middle part of core, the stress Main Function making originally to make core generation deformation on the supporting member instead of on core pole piece, efficiently solves pole piece and the problem causing core to be out of shape of wriggling occurs under effect of stress.Current interrupt mechanism is provided with between anode pole piece and cover plate positive terminal, this device is positioned at support component body, when electric current is excessive, when there is fusing, fusing process and fusing product all do not contact with positive and negative plate with core in supporter inside, improve safety in utilization.

Accompanying drawing explanation

Fig. 1 is external structure schematic diagram of the present utility model;

Fig. 2 is the structural representation after the utility model removes shell;

Fig. 3 is the utility model cover plate and supporter structural representation when being assembled together;

Fig. 4 is the structural representation of the utility model cover plate;

Fig. 5 is the main TV structure schematic diagram of supporter in the utility model;

Fig. 6 is the vertical view of supporter in the utility model.

Embodiment

Below in conjunction with the drawings and specific embodiments, the utility model will be further described.

As shown in Figure 1, Figure 2, shown in Fig. 3, Fig. 4, Fig. 5 and Fig. 6, the present embodiment comprises insulation crust 4, comprises positive plate, the core 3 of negative plate and barrier film, insulation cover plate 1, insulation support body 2 and electrolyte.Positive terminal 5 and negative terminal 6 is fixed with outside cover plate 1, be fixed with inside cover plate the aluminium brace 1-1 that welds together with positive terminal 5 and with the copper brace 1-4 that negative terminal 6 welds together, have the fixed leg A1-3 and fixed leg B1-5 that to carry out with supporter 2 assembling inside cover plate.Fixed leg A1-3 and fixed leg B1-5 and positive and negative pole 5 and 6 insulate.Supporter 2 is fitted together by location notch 2-3 and 2-5 matched with fixed leg A1-3 and fixed leg B1-5 on it and the fixed leg A1-3 inside cover plate 1 and the tight insert group of fixed leg B1-5.Aluminium brace 1-1 passes location hole 2-1 corresponding in supporting bracket 2, exposes, and weld together with the positive pole ear of core 3 in supporter 2 bottom.Copper brace 1-4 is positioned at location notch 2-4 corresponding in supporting bracket 2, and welds together with the negative lug of core.Supporter 2 bottom has operating winding location hole 2-6, during for reeling and winding mechanism locate; Left and right interposition is equipped with barrier film pressing position breach 2-2, and the core 3 comprising positive plate, negative plate and barrier film is wound on outside supporter 2, and during winding, barrier film initiating terminal is crimped on the breach 2-2 place, barrier film pressing position of supporter.Preferably, the aluminium brace 1-1 in supporter 2 is provided with current interrupt mechanism 1-2.Preferably, described insulation support body 2 is the supporters be made up of pottery or PP/PET engineering plastics.Preferably, described insulation support body 2 cross section be oval or two minor faces be semicircular arc like rectangle or hexagon.

It should be noted that, according to the above description the announcement of book and elaboration, the utility model those skilled in the art can also change above-mentioned execution mode and revise.Therefore, the utility model is not limited to embodiment disclosed and described above, also should in the protection range of claim of the present utility model to equivalent modifications more of the present utility model and change.

Here is a specific embodiment:

Battery size 47-174-112, uses the barrier film of width 93mm, the negative plate of width 91mm, the positive plate of width 89mm, directly uses package assembly of the present utility model, and the supporter on cover plate uses as volume pin, reels, core height 94 ± 1mm.Core negative electrode lug and copper brace adopt laser welding, core negative electrode lug and aluminium brace adopt ultrasonic bond, positive pole bonding pad of clapping after ultrasonic bond makes it substantially parallel with supporter side, put into baking oven baking to dewater, assemble with housing in the drying room of relative temperature less than 2%, solder up, fluid injection, change into, exhaust, envelope liquid injection port.Supporter completes to battery and in use procedure, all at inside battery, mainly bears object as stress from winding, stops the further distortion of core.

Claims

1. reel a power lithium-ion battery, and it comprises insulation crust, comprises positive plate, the core of negative plate and barrier film, insulation cover plate, insulation support body and electrolyte; It is characterized in that: it also comprises insulation support body; Positive terminal and negative terminal is fixed with outside cover plate, the aluminium brace welded together with positive terminal and the copper brace welded together with negative terminal is fixed with inside cover plate, have fixed leg A and B carrying out with supporter assembling inside cover plate, fixed leg A and B and positive and negative pole insulate; Supporter upper end have match with each fixed leg A, fixed leg B and the copper brace on cover plate location notch, aluminium brace location hole, the other end has operating winding location hole, and left and right interposition is equipped with barrier film pressing position breach; Supporter is tightly inserted on fixed leg A on the cover board and fixed leg B, and copper brace is positioned at location notch corresponding in supporting bracket, welds together with the negative lug of core; Aluminium brace passes location hole corresponding in supporting bracket, welds together with the positive pole ear of core; Core is wound on outside supporter, and shell is fixed on the outside of core, and barrier film top is crimped on the barrier film pressing position indentation, there of supporter.

2. winding power lithium-ion battery according to claim 1, is characterized in that: described insulation support body is the supporter be made up of pottery or PP/PET engineering plastics.

3. winding power lithium-ion battery according to claim 1 and 2, is characterized in that: it also comprises current interrupt mechanism, and current interrupt mechanism is arranged on the aluminium brace in supporter.

4. winding power lithium-ion battery according to claim 3, is characterized in that: described supporter cross section be oval or two minor faces be semicircular arc like rectangle or hexagon.

5. winding power lithium-ion battery according to claim 1 and 2, is characterized in that: described supporter cross section be oval or two minor faces be semicircular arc like rectangle or hexagon.