CN204991889U

CN204991889U - Power battery

Info

Publication number: CN204991889U
Application number: CN201520430503.2U
Authority: CN
Inventors: 刘海湘; 杨绍福; 倪杰
Original assignee: Tig Technology Co Ltd
Current assignee: Tig Technology Co Ltd
Priority date: 2015-06-19
Filing date: 2015-06-19
Publication date: 2016-01-20
Anticipated expiration: 2025-06-19

Abstract

The utility model discloses a power battery, including rolling up core, shell, anodal mass flow piece and negative pole mass flow piece, roll up anodal active layer and negative pole active layer that the core was convoluteed including mutual insulation, and: draw forth the end at the positive pole, anodal active layer protrusion in the negative pole active layer so that anodal mass flow chip bonding extremely anodal active layer, hold at the cathode extraction, negative pole active layer protrusion in anodal active layer so that negative pole mass flow chip bonding extremely the negative pole active layer, anodal mass flow piece with the shell electricity is connected in order to draw forth the positive pole, negative pole mass flow piece with the insulating electricity of shell is connected to bronze medal lid in order to draw forth the negative pole. The utility model provides a power battery compares with prior art, need not that processing utmost point ear is just being drawn forth, the negative pole to production efficiency is high, with low costs, and the security performance is good.

Description

A kind of electrokinetic cell

Technical field

The utility model relates to electrokinetic cell.

Background technology

Existing electrokinetic cell generally adopts pole piece and lug to draw both positive and negative polarity, and (both positive and negative polarity all adopts the lead-out mode of multi pole ears, be welded on respectively on the pole of positive and negative two ends), this mode needs to cut out lug, complex procedures and collector edge easily produces burr (thorn), burr (thorn) easily pierce through pole piece (barrier film), cause battery short circuit, time serious, produce the danger such as heating blast; On the other hand because of the reason of electrochemical potentials, existing cathode of lithium battery end needs to adopt copper flow collection sheet and copper cover plate, copper cover plate is easily oxidized in atmosphere due to long term exposure, be unfavorable for welding with pole, the ohmic internal resistance of battery can significantly promote simultaneously, easily causes battery cathode fever phenomenon serious.

Utility model content

In order to make up above-mentioned the deficiencies in the prior art, the utility model proposes a kind of electrokinetic cell, comprising core, shell, anode collection sheet and negative pole currect collecting sheet; Described core comprises concentric winding and the positive-active layer of mutually insulated and negative electrode active layer, and: at positive pole exit, described positive-active layer protrudes from described negative electrode active layer and is soldered to described positive-active layer to make described anode collection sheet; At negative pole exit, described negative electrode active layer protrudes from described positive-active layer and is soldered to described negative electrode active layer to make described negative pole currect collecting sheet; Described anode collection sheet is electrically connected to draw positive pole with described shell, and described negative pole currect collecting sheet and described casing insulation are also electrically connected to a bronze medal lid to draw negative pole.In the technical program, positive and negative electrode active layer insulation roll around and in height stagger, make positive-active layer protrude from negative electrode active layer at positive pole exit, convenient to weld with anode collection sheet, avoid anode collection sheet to be welded to negative electrode active layer simultaneously; In like manner, also make negative pole currect collecting sheet be welded to negative electrode active layer at negative pole exit and do not reach positive-active layer, negative pole is drawn by the copper lid again by being electrically connected with negative pole currect collecting sheet, make shell positively charged by anode collection sheet is welded with shell and positive pole is drawn simultaneously, thus, without the need to cutting lug to draw both positive and negative polarity, the operation avoiding trimming and the burr brought thereof pierce through the defect of pole piece, and the production efficiency of electrokinetic cell and fail safe are improved.

Preferably, be provided with aluminium lid outside described copper lid, described negative pole currect collecting sheet is soldered to described copper lid, and described copper lid is soldered to described aluminium lid, and described aluminium lid outwardly formation negative pole pole is to draw negative pole; The first sealing ring is coated with to make negative pole and described casing insulation at the edge of described negative pole currect collecting sheet, described copper lid and described aluminium lid three.By adding aluminium lid outside copper lid, copper cover can be prevented to be oxidized and to reduce the reliability of battery; Separately, the first sealing ring not only plays the effect of positive and negative electrode electric isolution, also serves the effect to inside battery sealing, thus prevents solution leakage from affecting the normal use of battery to there is chemical reaction between copper lid and aluminium lid.

Preferably, space is reserved with between described copper lid and described negative pole currect collecting sheet.This reserved space can the residual gas of storage battery inside, prevents blast etc., improves fail safe.

Preferably, described shell is the cylindrical shape that one end open and the other end have bottom, and described bottom is protruded and formed Positive Poles, and described anode collection sheet and described shell interference fit are also soldered to described shell to draw positive pole by described Positive Poles.Directly draw positive pole by the pole of outer casing bottom, and the processing of outer casing bottom pole is comparatively simple, also can not have an impact to the security performance of battery itself.In addition, cylindric battery capacity is relatively large.

Preferably, described Positive Poles central authorities offer liquid injection hole, and described liquid injection hole is sealed by a plug, are pressed with aluminium plug outside described plug, and described aluminium plug welding is connected to described Positive Poles.Outside plug, set up an aluminium plug welded with Positive Poles, can prevent plug from being washed open by the gas that inside battery discharges.

Preferably, described bottom is provided with the safety valve for pressure release, is coated with protective cover outside described safety valve.Bottom is provided with safety valve, when inside battery has a large amount of gas to produce, can release, prevent battery explosion from safety valve.

Preferably, the cylindrical shape that described shell is one end open, the other end has bottom, described bottom is provided with the pole column hole of protrusion, and described anode collection sheet protrudes and forms Positive Poles, and described Positive Poles is positioned at described pole column hole and welds to draw positive pole with described pole column hole.Directly on anode collection sheet, process pole, and drawn by pole by the pole column hole of outer casing bottom, thus draw positive pole, this kind of mode manufacturing procedure is comparatively simple, also can not have an impact to the security performance of battery itself.In addition, cylindric battery capacity is relatively large.

Preferably, described Positive Poles is arranged with the second sealing ring with described pole column hole interference fit.

To sum up, compared with prior art, without the need to processing lug to draw positive and negative electrode, thus production efficiency is high, cost is low, and security performance is good for the electrokinetic cell that the utility model provides.

Accompanying drawing explanation

Fig. 1 is the exploded perspective view of the electrokinetic cell that the utility model embodiment 1 provides;

Fig. 2 is the negative pole cutaway view of the electrokinetic cell of Fig. 1;

Fig. 3 is the positive pole cross-sectional schematic of the electrokinetic cell of Fig. 1;

Fig. 4 is the positive pole schematic diagram of the electrokinetic cell that the utility model embodiment 2 provides.

Embodiment

Below in conjunction with accompanying drawing and concrete execution mode, the utility model is described in further detail.

Embodiment 1

The present embodiment provides a kind of electrokinetic cell, as shown in Figure 1 to Figure 3, comprise shell 10, core 20, anode collection sheet 31 and negative pole currect collecting sheet 32, core 20 comprises concentric layer by layer winding and the positive-active layer of mutually insulated and negative electrode active layer, and: at the positive pole exit of battery, described positive-active layer (being generally aluminium foil) protrudes from described negative electrode active layer (being generally Copper Foil) and is soldered to described positive-active layer to make described anode collection sheet 31; At the negative pole exit of battery, described negative electrode active layer protrudes from described positive-active layer and is soldered to described negative electrode active layer to make described negative pole currect collecting sheet 32; Anode collection sheet 31 is electrically connected to draw positive pole from shell 10 with shell 10, and negative pole currect collecting sheet 32 and shell 10 insulate and be electrically connected to a bronze medal lid 33 to draw negative pole.In preferred execution mode, as shown in figures 1 and 3, the outside of copper lid 33 is provided with aluminium lid 34, negative pole currect collecting sheet 32 welds with copper lid 33 (such as adopting Laser Welding) realizes being electrically connected, copper lid 33 welds (such as adopt supersonic welding or friction welding (FW)) realizes electrical connection to aluminium lid 34, aluminium lid 34 outwardly formation negative pole pole 341 thus draw negative pole.In order to realize the insulation between positive and negative electrode, the first sealing ring 35 is coated with at the edge of negative pole currect collecting sheet 32, copper lid 33 and aluminium lid 34 three, first sealing ring 35 preferably with shell 10 interference fit, not only play the effect that negative pole and shell (i.e. positive pole) are insulated, and play the effect of sealed cell inside, can prevent the solution leakage of inside battery between copper lid 33 and aluminium lid 34, chemical reaction occurring, affect the normal use of battery.

As shown in Figure 2, between copper lid 33 and negative pole currect collecting sheet 32, be reserved with space S, this reserved space S can the gas of storage battery inside, prevents battery explosion etc.

As shown in Figure 3, the cylindrical shape (i.e. the shell of prismatic battery) that shell 10 is one end open, the other end has bottom, described bottom is protruded and is formed Positive Poles 101, anode collection sheet 31 is with shell 10 interference fit and be connected on shell 10 by penetrating to weld by the edge joint weld of anode collection sheet 31, thus, draw positive pole by Positive Poles 101 positively charged.Separately, in Positive Poles 101, central authorities open liquid injection hole 102, are sealed by plug 103 pairs of liquid injection holes 102, in order to prevent plug 103 in battery use procedure from may be washed open by gas, an aluminium plug 104 being pressed in plug 103 outside and being soldered to Positive Poles 101.In the execution mode be more preferably, as shown in Figure 3, the bottom of shell 10 is also provided with the safety valve 105 regulated for active pressure release, is coated with protective cover 106 outside safety valve 105.

The electrokinetic cell of the present embodiment, is adding man-hour, without the need to cutting lug, positive and negative electrode flow collection sheet being welded to the positive and negative electrode active layer of core, reinstalling in shell 10.

Embodiment 2

The present embodiment provides a kind of electrokinetic cell as shown in Figure 4, the electrokinetic cell provided with embodiment 1 is similar, difference is positive pole exit: the Positive Poles 107 in the present embodiment is that processing is on anode collection sheet 31, anode collection sheet 31 protrudes the Positive Poles 107 forming the present embodiment, the bottom of shell 10 offers for Positive Poles 107 through the pole column hole 108 be also electrically connected with it, realize positive pole by inwall Positive Poles 107 being soldered to pole column hole 108 and draw.The central authorities of Positive Poles 107 have liquid injection hole 109.Separately, the second sealing ring with pole column hole 108 interference fit is had, for sealed cell inside at Positive Poles 107 overcoat.

Above content is in conjunction with concrete preferred implementation further detailed description of the utility model, can not assert that concrete enforcement of the present utility model is confined to these explanations.For the utility model person of ordinary skill in the field; without departing from the concept of the premise utility; some equivalent to substitute or obvious modification can also be made, and performance or purposes identical, all should be considered as belonging to protection range of the present utility model.

Claims

1. an electrokinetic cell, is characterized in that: comprise core, shell, anode collection sheet and negative pole currect collecting sheet;

Described core comprises concentric winding and the positive-active layer of mutually insulated and negative electrode active layer, and: at positive pole exit, described positive-active layer protrudes from described negative electrode active layer and is soldered to described positive-active layer to make described anode collection sheet; At negative pole exit, described negative electrode active layer protrudes from described positive-active layer and is soldered to described negative electrode active layer to make described negative pole currect collecting sheet;

Described anode collection sheet is electrically connected to draw positive pole with described shell, and described negative pole currect collecting sheet and described casing insulation are also electrically connected to a bronze medal lid to draw negative pole.

2. electrokinetic cell as claimed in claim 1, it is characterized in that: be provided with aluminium lid outside described copper lid, described negative pole currect collecting sheet is soldered to described copper lid, and described copper lid is soldered to described aluminium lid, and described aluminium lid outwardly formation negative pole pole is to draw negative pole; The first sealing ring is coated with to make negative pole and described casing insulation at the edge of described negative pole currect collecting sheet, described copper lid and described aluminium lid three.

3. electrokinetic cell as claimed in claim 2, is characterized in that: be reserved with space between described copper lid and described negative pole currect collecting sheet.

4. the electrokinetic cell as described in any one of claims 1 to 3, it is characterized in that: described shell is the cylindrical shape that one end open and the other end have bottom, described bottom is protruded and is formed Positive Poles, and described anode collection sheet and described shell interference fit are also soldered to described shell to draw positive pole by described Positive Poles.

5. electrokinetic cell as claimed in claim 4, it is characterized in that: described Positive Poles central authorities offer liquid injection hole, and described liquid injection hole is sealed by a plug, are pressed with aluminium plug outside described plug, described aluminium plug welding is connected to described Positive Poles.

6. electrokinetic cell as claimed in claim 4, is characterized in that: described bottom is provided with the safety valve for pressure release, is coated with protective cover outside described safety valve.

7. the electrokinetic cell as described in any one of claims 1 to 3, it is characterized in that: the cylindrical shape that described shell is one end open, the other end has bottom, described bottom is provided with the pole column hole of protrusion, described anode collection sheet protrudes and forms Positive Poles, and described Positive Poles is positioned at described pole column hole and welds to draw positive pole with described pole column hole.

8. electrokinetic cell as claimed in claim 7, it is characterized in that: described Positive Poles central authorities offer liquid injection hole, and described liquid injection hole is sealed by a plug, are pressed with aluminium plug outside described plug, described aluminium plug welding is connected to described Positive Poles.

9. electrokinetic cell as claimed in claim 8, is characterized in that: described Positive Poles is arranged with the second sealing ring with described pole column hole interference fit.

10. electrokinetic cell as claimed in claim 7, is characterized in that: described bottom is provided with the safety valve for pressure release, is coated with protective cover outside described safety valve.