CN207368124U - A kind of flexible packing lithium ion battery - Google Patents
A kind of flexible packing lithium ion battery Download PDFInfo
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- CN207368124U CN207368124U CN201720930357.9U CN201720930357U CN207368124U CN 207368124 U CN207368124 U CN 207368124U CN 201720930357 U CN201720930357 U CN 201720930357U CN 207368124 U CN207368124 U CN 207368124U
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- pole piece
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
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Abstract
The utility model belongs to battery structure technical field, more particularly to a kind of flexible packing lithium ion battery, including by anode pole piece, isolation film and cathode pole piece stack gradually winding and form the battery core with multilayer pole piece layer, anode pole piece, which leaves, is not coated with the anode ear welding section of active material to weld positive pole ear, cathode pole piece, which leaves, is not coated with the negative pole lug welding area of active material to weld negative lug, it is welded with battery core on the pole piece layer of positive pole ear or negative lug and is provided with filled layer, filled layer is provided with lug groove corresponding with anode ear welding section and negative pole lug welding area, so that filled layer can cover pole piece layer and correspond to region beyond anode ear welding section and negative pole lug welding area.By setting filled layer, and filled layer is set to cover the region beyond pole piece layer anode ear welding section and negative pole lug welding area, the region partially thin with respect to lug welding position to pole piece layer carries out the compensation of thickness, so that the thickness for the battery core being finally wound into is uniform.
Description
Technical field
The utility model belongs to battery structure technical field, and in particular to a kind of flexible packing lithium ion battery.
Background technology
Lithium ion battery has the advantages that voltage is high, bigger than energy, self discharge is small, has extended cycle life.From last century 90
At the beginning of age by the commercialization of energy company of Sony since, lithium ion battery receives the extensive concern of various countries scientific research personnel and deeply grinds
Study carefully, and be developed rapidly in the past thirty years, be applied to digital camera, mobile phone, laptop, electricity now
Power driven tools, electric bicycle, electric automobile and energy-storage system etc..
The structure of flexible packing lithium ion battery is broadly divided into lamination and winding two ways.Using the flexible package of winding-structure
Battery core, generally by the blank collector along on pole piece length direction soldering polar ear carry out extracted current, by tab welding
Part on pole piece is known as the root of lug, and since lug root weld is on pole piece, and lug root is usually in naked battery core
Innermost layer, lug root is overlapping with pole piece in interlayer during winding, the thickness at lug root（Including rubberizing paper at tab welding
Thickness）It can be superimposed upon on pole piece, therefore, the thickness of battery core is all being different along the distribution on battery core width and length direction
, usually most thick position is at lug.Battery core thickness distribution inequality can make battery core various places inside, and stress is not in process of production
And the stress during charge and discharge cycles is uneven with expansion, is easy to cause battery core and deforms, on the one hand makes its thickness acute
It is strong increase and exceed specification requirement of the terminal device to battery core, on the one hand can deteriorate battery core performance.
, in the prior art can be as shown in Figure 1, in order to avoid the most thick place of battery core is concentrated on the position of tab welding
One layer of filled layer 3 is set between positive pole ear 1 and negative lug 2 so that the thickness of region A of the battery core between two lugs is equal
It is even, and the region B thickness of this part still can be less than the thickness at tab welding between lug and battery core side, especially at the two poles of the earth
When ear centre-to-centre spacing is smaller, the area of region B opposed areas A is much greater, is set in this case between two lugs on region
The effect of filled layer and unobvious, the problem of battery core uneven thickness can not be improved well.
In view of this, it is necessary to a kind of flexible packing lithium ion battery structure is provided, so that battery core thickness distribution is uniform.
Utility model content
The purpose of this utility model is that：In view of the deficiencies of the prior art, there is provided a kind of flexible packing lithium ion battery, so that
The battery core thickness of battery is uniform.
To achieve these goals, the utility model adopts the following technical solution：
A kind of flexible packing lithium ion battery, including by anode pole piece, isolation film and cathode pole piece stack gradually winding and
Into the battery core with multilayer pole piece layer, the anode pole piece leaves the anode ear welding section for not being coated with active material, with weldering
Positive pole ear is connect, the cathode pole piece leaves the negative pole lug welding area for not being coated with active material, to weld negative lug, in electricity
Core, which is welded with positive pole ear or the pole piece layer of negative lug, is provided with filled layer, and the filled layer is provided with and the anode ear
The corresponding lug groove in welding section and negative pole lug welding area, so that the filled layer can cover corresponds to anode ear on the pole piece layer
Region beyond welding section and negative pole lug welding area.
As a kind of improvement of flexible packing lithium ion battery described in the utility model, the filled layer is loose structure,
With do not influence electrolyte intermediate ion by the way that and the filled layer of loose structure can also accelerate the diffusion of electrolyte and the leaching of battery core
Profit, and preserve certain electrolyte simultaneously can after cycling the phase discharge, add the cycle performance of battery core.
As a kind of improvement of flexible packing lithium ion battery described in the utility model, the filled layer is polyethylene, gathers
One or more among propylene, polyacrylate, Kynoar or polytetrafluoroethylene (PTFE).
As a kind of improvement of flexible packing lithium ion battery described in the utility model, the aperture in the hole on the filled layer
For 3~30 μm.
As a kind of improvement of flexible packing lithium ion battery described in the utility model, the porosity on the filled layer is
20%~80%, while to ensure that filled layer has enough mechanical strengths, can also there is certain imbibition liquid-keeping property.
As a kind of improvement of flexible packing lithium ion battery described in the utility model, the filling layer thickness is uniform.For
So that being finally wound into the uniform battery core of integral thickness, according to the needs of practical application, the filled layer can also be gradient
The structure in uneven thickness of change.
As a kind of improvement of flexible packing lithium ion battery described in the utility model, the filling layer thickness for 10~
200µm。
The beneficial effects of the utility model are：A kind of flexible packing lithium ion battery is provided, by being welded with just in battery core
Filled layer is provided with pole lug or the pole piece layer of negative lug, and it is corresponding on the pole piece layer filled layer is covered
Region beyond anode ear welding section and negative pole lug welding area, so as on the premise of in addition battery core thickness is not increased, to pole
The lamella region partially thin with respect to lug welding position carries out the compensation of thickness, so that the thickness for the battery core being finally wound into is equal
It is even, avoid the occurrence of during the unbalance stress caused by battery core thickness is inconsistent in process of production and charge and discharge cycles
Stress and the problem of expansion uneven, and then reduce the risk of battery core deformation.
Brief description of the drawings
Fig. 1 is a kind of structure diagram of lithium ion battery in the prior art.
Fig. 2 is the structure diagram of the embodiment 1 of the utility model.
Fig. 3 is the structure structure diagram of the filled layer of the embodiment 1 of the utility model.
Fig. 4 is the structure diagram of the embodiment 2 of the utility model.
Fig. 5 is the structure structure diagram of the filled layer of the embodiment 2 of the utility model.
Fig. 6 is the structure diagram of the embodiment 3 of the utility model.
Fig. 7 is the structure structure diagram of the filled layer of the embodiment 3 of the utility model.
Wherein, 1. positive pole ear, 2. negative lugs, 3. filled layers, 4. anode ear welding sections, 5. negative pole lug welding areas, 6.
Lug groove.
Embodiment
The utility model and its advantage are made below in conjunction with embodiment and Figure of description further detailed
Describe in detail bright, still, specific embodiment of the present utility model is not limited thereto.
As shown in Figures 2 and 3, a kind of flexible packing lithium ion battery, including by anode pole piece, isolation film and cathode pole piece
Stack gradually winding and form the battery core with multilayer pole piece layer, the anode pole piece leaves the anode ear for not being coated with active material
To weld positive pole ear 1, the cathode pole piece leaves the negative pole lug welding area 5 for not being coated with active material with welding for welding section 4
Negative lug 2, is welded with the pole piece layer of positive pole ear 1 in battery core and is provided with filled layer 3, and the filled layer 3 is provided with and institute
The corresponding lug groove 6 in anode ear welding section 4 and negative pole lug welding area 5 is stated, so that the filled layer 3 can cover the pole piece layer
Region beyond anode ear welding section 4 and negative pole lug welding area 5.The filled layer 3 be loose structure polyethylene, the filling
The aperture in the hole on layer 3 is 10 μm, and the porosity of filled layer 3 is 40%, and the thickness of the filled layer 3 is uniform, its thickness is
100µm。
Filled layer 3 is provided with by being welded with battery core on positive pole ear 1 or the pole piece layer of negative lug 2, and is made described
Filled layer 3 can cover the region beyond the pole piece layer anode ear welding section 4 and negative pole lug welding area 5, so as to not another
On the premise of outer increase battery core thickness, the region partially thin with respect to lug welding position to pole piece layer carries out the compensation of thickness, so that
So that the thickness for the battery core being finally wound into is uniform, avoid the occurrence of caused by battery core thickness is inconsistent in process of production
The problem of stress during unbalance stress and charge and discharge cycles and uneven expansion, and then reduce the risk of battery core deformation.
Embodiment 2
As shown in Figures 4 and 5, with embodiment 1 difference lies in：
The filled layer 3 mixes for the polypropylene and polyacrylate of loose structure, the aperture in the hole on the filled layer 3
For 20 μm, the porosity of filled layer 3 is 60%, and the thickness of the filled layer 3 is 120 μm.
And the center spacing of the positive pole ear 1 and negative lug 2 is big with respect to embodiment 1 so that the anode ear
Welding section 4 extends to a side of battery core, and the negative pole lug welding area 5 extends to another side of battery core, so that described
Filled layer 3 shows " convex " font.
Remaining is with embodiment 1, and details are not described herein.
Embodiment 3
As shown in Figures 6 and 7, with embodiment 1 difference lies in：
The filled layer 3 is polyethylene, polypropylene, polyacrylate, Kynoar and the polytetrafluoroethyl-ne of loose structure
The mixing of alkene, the aperture in the hole on the filled layer 3 is 15 μm, and the porosity of filled layer 3 is 35%, and the thickness of the filled layer 3
Spend for 150 μm.
And the center spacing of the positive pole ear 1 and negative lug 2 is small with respect to embodiment 1 so that the anode ear
Welding section 4 is connected with negative pole lug welding area 5, so that the filled layer 3 shows U shape.
Remaining is with embodiment 1, and details are not described herein.
Further, since in battery actual fabrication, the active material of pole coating can not possibly accomplish absolute uniform, coating
The obvious pole piece of active material difference in thickness, the thickness of its battery core being wound into separating film layer poststack can be in length direction and width
Degree direction shows graded, and for this kind of situation, the thickness of the filled layer 3 can also be arranged to corresponding graded, with
Make the battery core thickness after winding uniform.
According to the disclosure and teachings of the above specification, the utility model those skilled in the art can also be to above-mentioned reality
Apply mode make a change and modification.Therefore, the utility model is not limited to above-mentioned embodiment, every this area skill
It is new that art personnel any conspicuously improved, replacement or modification made on the basis of the utility model belong to this practicality
The protection domain of type.In addition, although used some specific terms in this specification, but these terms are intended merely to conveniently say
It is bright, any restrictions are not formed to the utility model.
Claims (7)
1. a kind of flexible packing lithium ion battery, including winding is stacked gradually by anode pole piece, isolation film and cathode pole piece and is formed
Battery core with multilayer pole piece layer, the anode pole piece leave the anode ear welding section for not being coated with active material, to weld just
Pole lug, the cathode pole piece leaves the negative pole lug welding area for not being coated with active material, and to weld negative lug, its feature exists
In：It is welded with battery core on the pole piece layer of positive pole ear or negative lug and is provided with filled layer, the filled layer is provided with and institute
The corresponding lug groove in anode ear welding section and negative pole lug welding area is stated, so that the filled layer can cover the pole piece layer cathode
Region beyond ear welding section and negative pole lug welding area.
A kind of 2. flexible packing lithium ion battery according to claim 1, it is characterised in that：The filled layer is porous knot
Structure.
A kind of 3. flexible packing lithium ion battery according to claim 2, it is characterised in that：The filled layer for polyethylene,
One or more among polypropylene, polyacrylate, Kynoar or polytetrafluoroethylene (PTFE).
A kind of 4. flexible packing lithium ion battery according to claim 2, it is characterised in that：The hole in the hole on the filled layer
Footpath is 3~30 μm.
5. according to a kind of any flexible packing lithium ion battery of claim 2 to 4, it is characterised in that：The filled layer
Porosity is 20%~80%.
A kind of 6. flexible packing lithium ion battery according to claim 1, it is characterised in that：The filling layer thickness is uniform.
A kind of 7. flexible packing lithium ion battery according to claim 6, it is characterised in that：The filling layer thickness for 10~
200µm。
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720930357.9U CN207368124U (en) | 2017-07-28 | 2017-07-28 | A kind of flexible packing lithium ion battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720930357.9U CN207368124U (en) | 2017-07-28 | 2017-07-28 | A kind of flexible packing lithium ion battery |
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| Publication Number | Publication Date |
|---|---|
| CN207368124U true CN207368124U (en) | 2018-05-15 |
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| CN201720930357.9U Active CN207368124U (en) | 2017-07-28 | 2017-07-28 | A kind of flexible packing lithium ion battery |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110773397A (en) * | 2019-09-18 | 2020-02-11 | 欣旺达电动汽车电池有限公司 | Method and system for gluing on battery cell |
| WO2021189465A1 (en) * | 2020-03-27 | 2021-09-30 | 宁德新能源科技有限公司 | Electrode assembly, electrochemical device including same, and electronic device |
| CN114188591A (en) * | 2021-11-19 | 2022-03-15 | 宁德新能源科技有限公司 | Battery cell, battery and electronic equipment |
| WO2023279257A1 (en) * | 2021-07-06 | 2023-01-12 | 宁德新能源科技有限公司 | Electrochemical device and electronic device |
-
2017
- 2017-07-28 CN CN201720930357.9U patent/CN207368124U/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110773397A (en) * | 2019-09-18 | 2020-02-11 | 欣旺达电动汽车电池有限公司 | Method and system for gluing on battery cell |
| CN110773397B (en) * | 2019-09-18 | 2023-08-15 | 欣旺达电动汽车电池有限公司 | Method and system for applying glue on battery cell |
| WO2021189465A1 (en) * | 2020-03-27 | 2021-09-30 | 宁德新能源科技有限公司 | Electrode assembly, electrochemical device including same, and electronic device |
| WO2023279257A1 (en) * | 2021-07-06 | 2023-01-12 | 宁德新能源科技有限公司 | Electrochemical device and electronic device |
| CN114188591A (en) * | 2021-11-19 | 2022-03-15 | 宁德新能源科技有限公司 | Battery cell, battery and electronic equipment |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CP02 | Change in the address of a patent holder |
Address after: 523000 room 602, building 14, No. 7, Keji Avenue, Houjie Town, Dongguan City, Guangdong Province Patentee after: DONGGUAN XINRUI ENERGY TECHNOLOGY CO.,LTD. Address before: 523000 No. 803a, central Fortune Plaza, No. 92, Hongfu Road, Nancheng street, Dongguan City, Guangdong Province (cluster registration) Patentee before: DONGGUAN XINRUI ENERGY TECHNOLOGY CO.,LTD. |
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