CN209571500U

CN209571500U - A kind of lithium ion battery

Info

Publication number: CN209571500U
Application number: CN201920536146.6U
Authority: CN
Inventors: 范东平; 何虹; 蔡大为
Original assignee: DONGGUAN TAIYOUYUAN BATTERY SCIENCE & TECHNOLOGY Co Ltd
Current assignee: DONGGUAN TAIYOUYUAN BATTERY SCIENCE & TECHNOLOGY Co Ltd
Priority date: 2019-04-19
Filing date: 2019-04-19
Publication date: 2019-11-01
Anticipated expiration: 2029-04-19

Abstract

The utility model relates to a kind of lithium ion batteries, including shell, enclosure interior is provided with core, the outer wall adhesive tape of the core, the adhesive tape and first insulating trip at the core both ends is set and the core is fixed in the shell by the second insulating trip, the core includes the negative electrode tab being successively bonded, inner septum, positive plate and outer diaphragm, the winding start end of the negative electrode tab is located at the position after the winding 0.8-0.9 circle of positive plate winding start end, the electrode slice of the outmost turns of the core is negative electrode tab, the negative electrode tab includes copper foil current collector, active material coating is respectively coated in the copper foil current collector two sides, the active material coating outer surface is coated with the Thermal shutdown coating with Thermal shutdown mechanism of action, the outer surface of the shell is provided with cooling coating, heat for generating lithium ion battery It distributes, which is cooling material production.

Description

A kind of lithium ion battery

Technical field

The utility model relates to battery technology fields, more particularly to a kind of lithium ion battery.

Background technique

With the continuous development of society, people's lives level is also being gradually increased, while serious in face of resource loss Epoch, the environmental consciousness of people are also being continuously increased, and the rapid development of lithium ion battery in recent years becomes China's new energy industry Hot spot, lithium ion battery become solve new energy development bottleneck, conventionally, as material purity, production work There is battery core in electricity so that the rock-steady structure that battery core is clipped between terminal cover board and battery case bottom is destroyed in the factors such as skill The phenomenon that pond interior of shell is shaken, in addition, the space utilization rate of battery core is lower, battery capacity can not meet user well Demand need to be mechanically pulverized and the processes such as high-temperature calcination in addition, lithium ion battery is very troublesome when recycling in the later period, time Harvest point is very high, in addition, temperature increases once being abnormal in battery charge and discharge process, receives in the heat for being also not up to diaphragm When contracting temperature, charge and discharge will continue to carry out, and battery temperature can be increased further, and security risk equally exists, the utility model needle A kind of new solution is proposed to problem above.

Utility model content

Technical problem to be solved by the utility model is: for overcome the deficiencies in the prior art, providing a kind of lithium-ion electric Pond.

The technical solution adopted by the utility model to solve its technical problems is that: a kind of lithium ion battery, including shell, shell Body is internally provided with core, the outer wall adhesive tape of the core, the adhesive tape be arranged in the first of the core both ends absolutely The core is fixed in the shell by embolium and the second insulating trip, the core include the negative electrode tab being successively bonded, it is interior every Film, positive plate and outer diaphragm, after the winding start end of the negative electrode tab is located at positive plate winding start end winding 0.8-0.9 circle The electrode slice of position, the outmost turns of the core is negative electrode tab, and the positive plate includes trilaminate material, from top to bottom successively includes Active material layer, aqueous high molecular conductive coating and plus plate current-collecting body, each component is by weight in the aqueous high molecular conductive coating Amount percentage is calculated as: the content of surfactant is 0 .1-10 wt %, and the content of conductive agent is 15-70 wt %, aqueous high score The content of sub- compound is 0.2-50 wt %, and the content of binder is 0-8 wt %, and the negative electrode tab includes copper foil current collector, Active material coating is respectively coated in the copper foil current collector two sides, and the active material coating outer surface, which is coated with, has heat The Thermal shutdown coating of mechanism of action is turned off, the outer surface of the shell is provided with cooling coating, for generating lithium ion battery Heat distribute, the cooling coating be cooling material production.

Preferably, being additionally provided with adhesive layer on the apparent surface with the core faying face of the adhesive tape, and described viscous It ties layer and the inner walls bonds.

Preferably, the utility model improvement has, first insulating trip and second insulating trip by rubberised layer with Core both ends secure bond.

Preferably, the utility model improvement has, the winding end of the negative electrode tab is longer than the winding end of positive plate.

Preferably, the utility model improvement has, the winding end of the negative electrode tab is longer than the winding end 1- of positive plate 5mm。

Preferably, the utility model improvement has, the Thermal shutdown coating layer thickness is 0.2~10 μm.

Preferably, the utility model improvement have, the aqueous high molecular conductive coating with a thickness of 0.1-20 μm.

Preferably, the utility model improvement have, the rubberised layer with a thickness of 8-10 μm.

Based on the above-mentioned technical proposal, the design of adhesive tape can effectively prevent core and shake inside housings in the utility model Dynamic, and then prevent core from deforming, in addition, by changing winding method, first winding positive electrode sheet makes the battery core innermost circle electrode slice to be Positive plate effectively shortens the length of negative electrode tab, reduce cathode space, the positive leaf length of relative increase, and then mentions significantly High battery core capacity is capable of providing static conductive ability and collection in addition, the setting of aqueous high molecular conductive coating is on a current collector Micro-current reduces the resistance between positive active material and collector and the adhesive force of raising between the two, to reduce bonding The dosage of agent, and play the role of preventing oxidation and etch-proof to collector, by having in the coating of active material coating surface The Thermal shutdown coating production anode plate for lithium ionic cell of Thermal shutdown mechanism of action can be very good to prevent battery thermal runaway.

Detailed description of the invention

In order to illustrate the embodiment of the utility model or the technical proposal in the existing technology more clearly, below will be to embodiment Or attached drawing needed to be used in the description of the prior art is briefly described, it should be apparent that, the accompanying drawings in the following description is only It is some embodiments of the utility model, for those of ordinary skill in the art, before not making the creative labor property It puts, is also possible to obtain other drawings based on these drawings.

Fig. 1 is one preferred overall structure diagram of the utility model；

Fig. 2 is the fit structure schematic diagram of the utility model core and adhesive tape；

Fig. 3 is the structural schematic diagram of the utility model core；

Fig. 4 is the structural schematic diagram of the utility model positive plate；

Fig. 5 is the structural schematic diagram of the utility model negative electrode tab.

It is attached marked in the figure: 1, shell；2, core；3, adhesive tape；4, the first insulating trip；5, the second insulating trip；6, negative electrode tab；7, Inner septum；8, positive plate；9, outer diaphragm；10, active material layer；11, aqueous high molecular conductive coating；12, plus plate current-collecting body； 13, copper foil current collector；14, active material coating；15, Thermal shutdown coating；16, cool down coating.

Specific embodiment

With reference to the accompanying drawings and examples, specific embodiment of the present utility model is described in further detail.Below Embodiment is not intended to limit the scope of the utility model for illustrating the utility model.

It should be appreciated that such as " having ", "comprising" and " comprising " term used herein do not allot one or more The presence or addition of a other elements or combinations thereof.

As shown in Figures 1 to 5, a kind of lithium ion battery of the utility model, including shell 1, shell 1 are internally provided with volume Core 2, the outer wall adhesive tape 3 of the core 2, the adhesive tape 3 and the first insulating trip 4 that 2 both ends of core are set and the The core 2 is fixed in the shell 1 by two insulating trips 5, the core 2 include successively be bonded negative electrode tab 6, inner septum 7, Positive plate 8 and outer diaphragm 9, after the winding start end of the negative electrode tab 6 is located at 8 winding start end of positive plate winding 0.8-0.9 circle Position, the electrode slices of the outmost turns of the core is negative electrode tab 6, and the positive plate 8 includes trilaminate material, from top to bottom successively Including active material layer 10, aqueous high molecular conductive coating 11 and plus plate current-collecting body 12, the aqueous high molecular conductive coating 11 Middle each component percentage are as follows: the content of surfactant is 0 .1-10 wt %, and the content of conductive agent is 15-70 Wt %, the content of aqueous high molecular compound are 0.2-50 wt %, and the content of binder is 0-8 wt %, and the negative electrode tab 6 is wrapped Copper foil current collector 13 is included, active material coating 14 is respectively coated in 13 two sides of copper foil current collector, and the active material applies 14 outer surface of layer are coated with the Thermal shutdown coating 15 with Thermal shutdown mechanism of action, and the outer surface of the shell 1 is provided with cooling Coating 16, the heat for generating lithium ion battery distribute, which is cooling material production.

In the present embodiment, in order to preferably using adhesive tape, the opposite table with 2 faying face of core of the adhesive tape 3 Adhesive layer is additionally provided on face, and the adhesive layer and 1 inner wall of shell bond.

In the present embodiment, in order to preferably connect the first insulating trip and the second insulating trip with core, described first absolutely Embolium 4 and second insulating trip 5 pass through rubberised layer and the 2 both ends secure bond of core.

In the present embodiment, in order to preferably use negative electrode tab, the winding end of the negative electrode tab 6 is longer than positive plate 8 Winding end.

In the present embodiment, further for negative electrode tab is preferably used, the winding end of the negative electrode tab 6 is longer than anode The winding end 1-5mm of piece 8.

In the present embodiment, in order to preferably use Thermal shutdown coating, the Thermal shutdown coating 15 is with a thickness of 0.2-10 μ m。

In the present embodiment, in order to preferably using aqueous high molecular conductive coating, the aqueous high molecular conductive coating 11 with a thickness of 0.1-20 μm.

In the present embodiment, in order to preferably use rubberised layer, the rubberised layer with a thickness of 8-10 μm.

Working principle: before the use first making core, by negative electrode tab 6, inner septum 7, positive plate 8 and outside every Film 9 is successively bonded, to obtain core 2, then within the case 1 by the installation of core 2, the first insulating trip 4 and the second insulating trip 5 are logical Rubberised layer and 2 both ends secure bond of core are crossed, core is firmly bonded at 1 bottom of shell and shell slot position by rubberised layer.

Core with adhesive tape interacts with electrolyte, is added by the bulking effect of resin inside shell 1 The big volume of core, while increasing the core after volume 2 and 1 inner wall of shell is seamless applying, and expansion can make 2 outer layer of core The appropriateness of adhesive tape 3 is soft and absorbs the part of impact force produced in application process of core 2.

In addition, term " installation ", " being provided with ", " connection ", " connection ", " suit " shall be understood in a broad sense, for example, it may be It is fixedly connected, is detachably connected or monolithic construction；It can be mechanical connection, or electrical connection；It can be directly connected, or Being or is two connections internal between device, element or component indirectly connected through an intermediary, for ability For the those of ordinary skill of domain, the concrete meaning of above-mentioned term in the present invention can be understood as the case may be.

The above is only the preferred embodiment of the utility model, it is noted that for the common skill of the art For art personnel, without deviating from the technical principle of the utility model, several improvements and modifications can also be made, these change It also should be regarded as the protection scope of the utility model into modification.

Claims

1. a kind of lithium ion battery, including shell (1), shell (1) are internally provided with core (2), which is characterized in that the core (2) the first insulating trip (4) and second of outer wall adhesive tape (3), the adhesive tape (3) and setting at the core (2) both ends The core (2) is fixed in the shell (1) by insulating trip (5), the core (2) include the negative electrode tab (6) being successively bonded, Inner septum (7), positive plate (8) and outer diaphragm (9), the winding start end of the negative electrode tab (6) are located at positive plate (8) winding start Position after the winding 0.8-0.9 circle of end, the electrode slice of the outmost turns of the core is negative electrode tab (6), and the positive plate (8) includes Trilaminate material from top to bottom successively includes active material layer (10), aqueous high molecular conductive coating (11) and plus plate current-collecting body (12), the negative electrode tab (6) includes copper foil current collector (13), and active material is respectively coated in the copper foil current collector (13) two sides Expect coating (14), active material coating (14) outer surface is coated with the Thermal shutdown coating with Thermal shutdown mechanism of action (15), the outer surface of the shell (1) is provided with cooling coating (16).

2. lithium ion battery as described in claim 1, which is characterized in that the adhesive tape (3) with the core (2) faying face Apparent surface on be additionally provided with adhesive layer, and the adhesive layer and the shell (1) inner wall bond.

3. lithium ion battery as claimed in claim 2, which is characterized in that first insulating trip (4) and second insulation Piece (5) passes through rubberised layer and the core (2) both ends secure bond.

4. lithium ion battery as claimed in claim 3, which is characterized in that the winding end of the negative electrode tab (6) is longer than anode The winding end of piece (8).

5. lithium ion battery as claimed in claim 4, which is characterized in that the winding end of the negative electrode tab (6) is longer than anode The winding end 1-5mm of piece (8).

6. lithium ion battery as described in claim 1, which is characterized in that the Thermal shutdown coating (15) is with a thickness of 0.2-10 μm。

7. lithium ion battery as described in claim 1, which is characterized in that the thickness of the aqueous high molecular conductive coating (11) It is 0.1-20 μm.

8. lithium ion battery as claimed in claim 3, which is characterized in that the rubberised layer with a thickness of 8-10 μm.