CN202495522U - Square lithium ion battery with winding structure and positive pole piece thereof - Google Patents
Square lithium ion battery with winding structure and positive pole piece thereof Download PDFInfo
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- CN202495522U CN202495522U CN2012200660474U CN201220066047U CN202495522U CN 202495522 U CN202495522 U CN 202495522U CN 2012200660474 U CN2012200660474 U CN 2012200660474U CN 201220066047 U CN201220066047 U CN 201220066047U CN 202495522 U CN202495522 U CN 202495522U
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- lithium ion
- ion battery
- positive plate
- winding
- positive pole
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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
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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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 the technical field of lithium ion batteries, in particular to a positive pole piece of a square lithium ion battery with a winding structure. The positive pole piece comprises a current collector of a positive pole and positive pole membranes coated on the two surfaces of the current collector of the positive pole, wherein grooves are arranged on the positive pole membranes. Compared with the prior art, the grooves are arranged on the positive pole piece of the square lithium ion battery with the winding structure, disclosed by the utility model, the grooves are particularly positioned at a turning of the positive pole piece after winding, and a negative pole material which is opposite to the positive pole piece is always in a charge unsaturated state during charge; and compared with the negative pole material in other regions, the volume expansion of a negative pole piece at the turning is small, the corresponding expansion stress is small and easy to release, and torsional deformation of a winding type square lithium ion electric core due to too large or centralized stress can be avoided. In addition, the utility model further discloses the square lithium ion battery with the winding structure, which comprises the positive pole piece.
Description
Technical field
The utility model belongs to technical field of lithium ion, and more particularly, the utility model relates to a kind of winding-structure rectangular lithium ion battery and positive plate thereof.
Background technology
Be accompanied by the miniaturization of consumer portable type electronic product, personalized development trend, rectangular lithium ion battery especially flexible package rectangular lithium ion battery has become first-selected or even unique power supply of smart mobile phone.Lamination and coiling dual mode are adopted in assembling as the electric core of lithium ion battery core component usually.Comparatively speaking, winding method is simple because of its technology, and efficiency of assembling is high and easily be automated, and is therefore adopted by numerous lithium ion battery manufacturing enterprise.
As everyone knows, the electrode active material of present business-like lithium ion battery is in different taking off under lithium or the embedding lithium state, because the change of lattice parameter, its macro manifestations is the change in volume of active material.With the graphite material is example, and by taking off the lithium state fully to complete embedding lithium state, its volume has and surpasses 10% expansion.The expansion of material must cause producing internal stress between coiled lithium ion electricity sandwich layer.For takeup type rectangular lithium ion electricity core, draw through force analysis, internal stress mainly concentrates on the coiling corner and is difficult for discharging, and macro manifestations is along rectangular lithium ion electricity core Width, by the squeezing action in the middle of two side direction.Material expands many more, and internal stress is big more, and squeezing action is also obvious more.When acquiring a certain degree, just cause the torsional deformation of takeup type rectangular lithium ion electricity core, even cause frustrating of interlayer pole piece.This distortion or frustrate the mechanical dimension that not only directly influences lithium-ion electric core, and influence its useful life, even influence its security performance.
In view of this, necessary a kind of winding-structure rectangular lithium ion battery and positive plate thereof that can prevent winding-structure rectangular lithium ion electricity core torsional deformation be provided.
The utility model content
One of purpose of the utility model is: a kind of positive plate that can prevent takeup type rectangular lithium ion electricity core torsional deformation is provided.
To achieve these goals, the utility model adopts following technical scheme:
A kind of winding-structure rectangular lithium ion battery positive plate comprises plus plate current-collecting body and is coated in the anodal diaphragm on the said plus plate current-collecting body two sides that said anodal diaphragm is provided with groove.
As a kind of improvement of the utility model winding-structure rectangular lithium ion battery positive plate, said groove is positioned at the turning after said positive plate is reeled.
As a kind of improvement of the utility model winding-structure rectangular lithium ion battery positive plate, the degree of depth of said groove is the 5-90% of the anodal diaphragm thickness of single face.If the degree of depth of groove is too little, then it is little to suppressing the effect that cell expansion played; If the degree of depth of groove is too big, energy density that then can battery has bigger influence.
As a kind of improvement of the utility model winding-structure rectangular lithium ion battery positive plate, the degree of depth of said groove is the 20-70% of the anodal diaphragm thickness of single face.
As a kind of improvement of the utility model winding-structure rectangular lithium ion battery positive plate, the degree of depth of said groove is 30% of the anodal diaphragm thickness of single face.
As a kind of improvement of the utility model winding-structure rectangular lithium ion battery positive plate, the gross area of said groove accounts for the 5-30% of the anodal diaphragm gross area of single face.The gross area of groove is too big, can considerable influence be arranged to the energy density of battery; The gross area of groove is too little, can not guarantee that then groove all covers the turning of positive plate.
As a kind of improvement of the utility model winding-structure rectangular lithium ion battery positive plate, said groove be shaped as rectangle, semicircle or half elliptic.
With respect to prior art, the utility model winding-structure rectangular lithium ion battery positive plate is provided with groove, and is special; This groove is positioned at the turning after positive plate is reeled; Its over against negative material the time be in charged undersaturated condition all the time in charging, for other regional negative materials, the negative plate volumetric expansion at turning is little; Therefore the torsional deformation of the excessive or concentrated takeup type rectangular lithium ion electricity core that causes of stress can not take place in the corresponding little and easy release of swelling stress.
Another purpose of the utility model is to provide a kind of winding-structure rectangular lithium ion battery; Comprise positive plate, negative plate, be interval in barrier film, packaging bag between said positive plate and the negative plate; And electrolyte; Said positive plate, barrier film and negative plate are reeled and are formed electric core, and said positive plate is the described winding-structure rectangular lithium ion battery of an above-mentioned paragraph positive plate.
As a kind of improvement of the utility model winding-structure rectangular lithium ion battery, positive plate, barrier film and negative plate to be reeled behind the electric core, said groove is positioned at the turning of said positive plate.
With respect to prior art; The utility model winding-structure rectangular lithium ion battery is because its positive plate is provided with groove; Thereby reduced to a great extent because the battery distortion that negative pole expands and causes; Prevent the security incident of frustrating the battery short circuit that causes and therefore causing owing to pole piece, the electrolyte that the packaging bag breakage that prevents simultaneously to cause owing to excessive expansion the causes accident that leaks, thus improved the security performance and the cycle life of lithium ion battery.
Description of drawings
Fig. 1 is the positive plate structural representation of the utility model embodiment 1;
Fig. 2 is the positive plate structural representation of the utility model embodiment 2;
Fig. 3 is the positive plate structural representation of the utility model embodiment 3;
Fig. 4 is the structural representation of the utility model winding-structure rectangular lithium ion battery.
Embodiment
Below in conjunction with Figure of description and embodiment, the utility model winding-structure rectangular lithium ion battery and positive plate thereof are elaborated.
Embodiment 1
As shown in Figure 1, a kind of winding-structure rectangular lithium ion battery of the utility model positive plate comprises plus plate current-collecting body 1 and is coated in the anodal diaphragm 2 on said plus plate current-collecting body 1 two sides that said anodal diaphragm 2 is provided with groove 3.
Wherein, said groove 3 is positioned at the turning after said positive plate is reeled.
The degree of depth of said groove 3 is the 5-90% of anodal diaphragm 2 thickness of single face, is preferably 20-70%, is more preferably 30%.
The gross area of said groove 3 accounts for the 5-30% of anodal diaphragm 2 gross areas of single face.
Said groove 3 be shaped as rectangle, semicircle or half elliptic.
In this embodiment, said groove 3 is set in place in the two sides of said plus plate current-collecting body 1 and said groove 3 is symmetrically distributed (symmetry axis is a plus plate current-collecting body 1) (as shown in Figure 1); The quantity of groove 3 can be selected according to the coiling number of turns, generally is not less than the coiling number of turns, preferably is symmetricly set on two corners with circle.
As shown in Figure 4; A kind of winding-structure rectangular lithium ion battery of the utility model; Comprise positive plate 4, negative plate 5, be interval in barrier film 6, packaging bag 7 between said positive plate 4 and the negative plate 5; And electrolyte, said positive plate 4, barrier film 6 and negative plate 5 are reeled and are formed electric core 8, and said positive plate 4 is the described winding-structure rectangular lithium ion battery of an above-mentioned paragraph positive plate.Wherein, behind positive plate 4, barrier film 6 and the electric core 8 of negative plate 5 coilings, said groove 3 is positioned at the turning of said positive plate 4.
Embodiment 2
Different with embodiment 1 is: the groove 3 of this embodiment is set in place the wherein one side (as shown in Figure 2) on the anodal diaphragm 2 on the two sides of said plus plate current-collecting body 1.Certainly, groove 3 should be at the turning after positive plate is reeled.All the other repeat no more with embodiment 1 here.
Different with embodiment 1 is: the groove 3 of this embodiment is set in place on two faces on the anodal diaphragm 2 on the two sides of said plus plate current-collecting body 1, but said groove 3 is not an axial symmetry distribute (as shown in Figure 3).Certainly, groove 3 should be at the turning after positive plate is reeled.
All the other repeat no more with embodiment 1 here.
In order to check the technique effect of the utility model winding-structure rectangular lithium ion battery positive plate, the utility model is that the flexible package winding-structure rectangular lithium ion battery of 103450 (length is 50mm, and wide is 34mm, and thickness is 10mm) is an evaluation object with model.
The positive plate of using positive plate and the utility model in the prior art (being that groove is not set on the positive plate) respectively and negative plate and barrier film put together machines and working procedure parameter is assembled 103450 electric cores respectively with identical, and adopt identical technological process and working procedure parameter finally to be made into the electric core of qualified flexible package 103450 takeup type rectangular lithium ions.The qualified electric core of each group of picked at random is done contrast test; Content measurement comprises: electric core is stored under different SOC (charged state) and different temperature condition and loop test (specifically comprises: partly fill state (50%SOC) normal temperature and store trimestral storage test; Partly fill the trimestral storage test of 45 ℃ of storages of state (50%SOC); Fully charged state (100%SOC) normal temperature is stored trimestral storage test; The trimestral storages test of 45 ℃ of fully charged states (100%SOC) storage, one month storages of 60 ℃ of storages of fully charged state (100%SOC) test, and the loop test of 45 ℃ of 1C circulations 500 times); Statistics is respectively organized the ratio that electric core is distorted and is out of shape, and the gained result sees table 1.
Table 1: the storage test of battery and loop test result
Can find out from table 1, compared with prior art, the distortion that can be distorted hardly when under multiple condition, using of the lithium ion battery of having used the utility model winding-structure rectangular lithium ion battery positive plate.This be because; The positive plate of the utility model winding-structure rectangular lithium ion battery is provided with groove, the turning that this groove is positioned at positive plate after reeling, its over against negative material be in charged undersaturated condition when the charging all the time; For other regional negative materials; The negative plate volumetric expansion at turning is little, and therefore the torsional deformation of the excessive or concentrated takeup type rectangular lithium ion electricity core that causes of stress can not take place in the corresponding little and easy release of swelling stress.
It is understandable that, only provided the part execution mode of the utility model in this specification.
Need to prove; The mode of offering of the utility model further groove 3 can be: the position of calculating turning, positive plate coiling back earlier; Then after the positive plate process is colded pressing; Cut in the position that calculates with bite, during cutting, can control the degree of depth, area and the shape of groove 3 according to actual needs.
According to above-mentioned principle, the utility model can also carry out suitable change and modification to above-mentioned embodiment.Therefore, the embodiment that discloses and describe above the utility model is not limited to is in the protection range of the claim that also should fall into the utility model to some modifications and the change of the utility model.In addition, although used some specific terms in this specification, these terms are explanation for ease just, the utility model is not constituted any restriction.
Claims (9)
1. a winding-structure rectangular lithium ion battery positive plate comprises plus plate current-collecting body and is coated in the anodal diaphragm on the said plus plate current-collecting body two sides, and it is characterized in that: said anodal diaphragm is provided with groove.
2. winding-structure rectangular lithium ion battery positive plate according to claim 1 is characterized in that: said groove is positioned at the turning after said positive plate is reeled.
3. winding-structure rectangular lithium ion battery positive plate according to claim 1 is characterized in that: the degree of depth of said groove is the 5-90% of the anodal diaphragm thickness of single face.
4. winding-structure rectangular lithium ion battery positive plate according to claim 3 is characterized in that: the degree of depth of said groove is the 20-70% of the anodal diaphragm thickness of single face.
5. winding-structure rectangular lithium ion battery positive plate according to claim 4 is characterized in that: the degree of depth of said groove is 30% of the anodal diaphragm thickness of single face.
6. winding-structure rectangular lithium ion battery positive plate according to claim 1 is characterized in that: the gross area of said groove accounts for the 5-30% of the anodal diaphragm gross area of single face.
7. winding-structure rectangular lithium ion battery positive plate according to claim 1 is characterized in that: said groove be shaped as rectangle, semicircle or half elliptic.
8. winding-structure rectangular lithium ion battery; Comprise positive plate, negative plate, be interval in barrier film, packaging bag between said positive plate and the negative plate; And electrolyte; Said positive plate, barrier film and negative plate are reeled and are formed electric core, and it is characterized in that: said positive plate is each described winding-structure rectangular lithium ion battery positive plate of claim 1 to 7.
9. winding-structure rectangular lithium ion battery according to claim 8 is characterized in that: positive plate, barrier film and negative plate are reeled behind the electric core, and said groove is positioned at the turning of said positive plate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012200660474U CN202495522U (en) | 2012-02-27 | 2012-02-27 | Square lithium ion battery with winding structure and positive pole piece thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012200660474U CN202495522U (en) | 2012-02-27 | 2012-02-27 | Square lithium ion battery with winding structure and positive pole piece thereof |
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| Publication Number | Publication Date |
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| CN202495522U true CN202495522U (en) | 2012-10-17 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2012200660474U Expired - Lifetime CN202495522U (en) | 2012-02-27 | 2012-02-27 | Square lithium ion battery with winding structure and positive pole piece thereof |
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103094521A (en) * | 2013-01-22 | 2013-05-08 | 宁德时代新能源科技有限公司 | Positive plate of lithium ion power battery as well as manufacturing method and laser etching device of positive plate |
| CN106099038A (en) * | 2016-06-22 | 2016-11-09 | 湖北金泉新材料有限责任公司 | A kind of battery pole piece |
| CN109768223A (en) * | 2019-03-15 | 2019-05-17 | 湖北锂诺新能源科技有限公司 | A kind of preparation method of coiled lithium ion battery cathode pole piece |
| CN109792071A (en) * | 2016-09-27 | 2019-05-21 | 罗伯特·博世有限公司 | For manufacturing the method and battery cell of the electrode stack of battery cell |
| CN111211279A (en) * | 2018-11-22 | 2020-05-29 | 宁德新能源科技有限公司 | Isolating membrane and lithium ion battery |
| CN112204768A (en) * | 2018-05-30 | 2021-01-08 | 松下知识产权经营株式会社 | Nonaqueous electrolyte secondary battery |
| CN112542616A (en) * | 2020-12-04 | 2021-03-23 | 东莞新能安科技有限公司 | Electrochemical device and electronic device |
| CN113054237A (en) * | 2021-03-30 | 2021-06-29 | 天津力神电池股份有限公司 | High-energy-density soft package lithium ion battery |
| CN114497457A (en) * | 2021-12-11 | 2022-05-13 | 上海兰钧新能源科技有限公司 | Battery core pole piece and battery based on laser drilling |
| CN114583289A (en) * | 2022-03-31 | 2022-06-03 | 珠海冠宇电池股份有限公司 | Lithium ion battery |
| CN114628795A (en) * | 2022-03-31 | 2022-06-14 | 珠海冠宇电池股份有限公司 | Lithium ion battery |
| WO2023245826A1 (en) * | 2022-06-20 | 2023-12-28 | 宁德时代新能源科技股份有限公司 | Positive electrode plate, battery cell, battery, and electric device |
-
2012
- 2012-02-27 CN CN2012200660474U patent/CN202495522U/en not_active Expired - Lifetime
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103094521A (en) * | 2013-01-22 | 2013-05-08 | 宁德时代新能源科技有限公司 | Positive plate of lithium ion power battery as well as manufacturing method and laser etching device of positive plate |
| CN106099038A (en) * | 2016-06-22 | 2016-11-09 | 湖北金泉新材料有限责任公司 | A kind of battery pole piece |
| CN109792071B (en) * | 2016-09-27 | 2022-04-05 | 罗伯特·博世有限公司 | Method for producing an electrode stack for a battery cell and battery cell |
| CN109792071A (en) * | 2016-09-27 | 2019-05-21 | 罗伯特·博世有限公司 | For manufacturing the method and battery cell of the electrode stack of battery cell |
| CN112204768A (en) * | 2018-05-30 | 2021-01-08 | 松下知识产权经营株式会社 | Nonaqueous electrolyte secondary battery |
| CN111211279A (en) * | 2018-11-22 | 2020-05-29 | 宁德新能源科技有限公司 | Isolating membrane and lithium ion battery |
| CN109768223A (en) * | 2019-03-15 | 2019-05-17 | 湖北锂诺新能源科技有限公司 | A kind of preparation method of coiled lithium ion battery cathode pole piece |
| CN112542616A (en) * | 2020-12-04 | 2021-03-23 | 东莞新能安科技有限公司 | Electrochemical device and electronic device |
| CN113054237A (en) * | 2021-03-30 | 2021-06-29 | 天津力神电池股份有限公司 | High-energy-density soft package lithium ion battery |
| CN114497457A (en) * | 2021-12-11 | 2022-05-13 | 上海兰钧新能源科技有限公司 | Battery core pole piece and battery based on laser drilling |
| CN114583289A (en) * | 2022-03-31 | 2022-06-03 | 珠海冠宇电池股份有限公司 | Lithium ion battery |
| CN114628795A (en) * | 2022-03-31 | 2022-06-14 | 珠海冠宇电池股份有限公司 | Lithium ion battery |
| WO2023245826A1 (en) * | 2022-06-20 | 2023-12-28 | 宁德时代新能源科技股份有限公司 | Positive electrode plate, battery cell, battery, and electric device |
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Legal Events
| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20121017 |