CN108461811B - Pole piece and battery cell for coiled lithium ion battery - Google Patents
Pole piece and battery cell for coiled lithium ion battery Download PDFInfo
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- CN108461811B CN108461811B CN201810806185.3A CN201810806185A CN108461811B CN 108461811 B CN108461811 B CN 108461811B CN 201810806185 A CN201810806185 A CN 201810806185A CN 108461811 B CN108461811 B CN 108461811B
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/052—Li-accumulators
- H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/058—Construction or manufacture
- H01M10/0587—Construction or manufacture of accumulators having only wound construction elements, i.e. wound positive electrodes, wound negative electrodes and wound separators
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/04—Processes of manufacture in general
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
- H01M4/139—Processes of manufacture
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/531—Electrode connections inside a battery casing
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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
-
- 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
Abstract
The invention provides a pole piece and an electric core for a winding type lithium ion battery, wherein the pole piece comprises a pole piece body, a plurality of tabs are arranged on the pole piece body and are divided into n groups, the number of the tabs in each group is m, the m tabs in each group are m/2 pairs, the width of 2 tabs in each pair is the same, the distance between the 2 tabs in each pair is equal to L1, the distance between two adjacent pairs of tabs in each group is equal to L2, the width of two adjacent pairs of tabs in each group is sequentially increased by L, and the surface of the pole piece body is completely coated with an electrode material. The invention has the beneficial effects that: the invention can shorten the length of the cutting die to improve the processing and manufacturing precision by doubling the number of the lugs; the current-carrying area of the tabs can be increased, and the power performance of the battery is improved; meanwhile, the problem that a sharp step is generated due to the fact that die cutting is needed twice in a die cutting area in the traditional method is avoided, the self-discharge rate of the battery is greatly reduced, and the energy density of the battery can be improved by adopting a full-coating mode.
Description
Technical field
The present invention relates to field of lithium ion battery, and in particular to a kind of pole piece and battery core of coiled lithium ion battery.
Background technique
The production method of battery core has stacked and two kinds of takeup type, phase under the conditions of field of lithium ion battery, the prior art
It is available faster at producing beat and superior battery performance using takeup type than in stacked production method, in order to
Lithium ion battery speed of production is improved, cost is reduced, is all intended to manufacture lithium ion battery by the way of winding in industry.For
Promotion energy density, coiled battery generally use multipole ear mold type, and under the mode, each circle pole piece draws tab,
Reduce more than half relative to traditional lamination process or full tab mode, the current-carrying capability of tab, but plus copper foil and
Aluminium foil tends to thinner direction and develops, and the current-carrying capability of tab has been increasingly becoming the bottle for restricting lithium ion battery power characteristic
Neck；Simultaneously as winding when the latter circumference of battery core than it is previous circle it is long, guarantee tab alignment under conditions of, need by tab it
Between spacing cross cutting twice, cutting die shake in the process can generate step, sharp burrs be formed, to cause self discharge increase even
It is short circuit, in order to evade this situation, some enterprises are solved by the way of edge coating ceramic insulating material, cause cost
Increase and energy density reduction.Thus, it would be highly desirable to develop it is a kind of be not only compatible with existing winding process but also can be promoted the power of battery spy
Property and reduce the lithium-ion electric core of self discharge, and the structure of pole piece directly determines core strueture, therefore is suitable for target volume
Wound lithium-ion electric core pole piece and its manufacturing method are just come into being.
Summary of the invention
It is an object of that present invention to provide a kind of Wind lithium ion core pole piece and its manufacturing methods, can shorten cutting die
Length is to improve processing and the accuracy of manufacture；The current carrying area of tab can be increased again, promote power of battery performance；Meanwhile this side
Method avoids cross cutting region in conventional method and needs to be die cut twice and lead to the problem of spine step, and self-discharge of battery is greatly reduced
Rate promotes energy density, reduces production cost.
The present invention is achieved by the following technical solutions:
A kind of pole piece for coiled lithium ion battery comprising pole piece ontology, the pole piece ontology are equipped with several
Tab, several tabs are divided into n group, and the quantity of tab is m in every group, and m tab in every group is divided into m/2 pairs, each pair of
In 2 tabs it is of same size, it is L1 that the spacing between 2 tabs of every centering is equal, adjacent two pairs of tabs in every group
Spacing is equal, is L2, and the width of adjacent two pairs of tabs successively increases L in every group, and the surface of the pole piece ontology all coats
There is electrode material.
Preferably, n >=2,5≤m≤80,5mm≤L1≤280mm, 5mm≤L2≤280mm, Δ L=π Δ t,
In, Δ t is the sum of two layers of diaphragm, anode pole piece, the thickness of cathode pole piece.
Preferably, the changing rule of the spacing between two adjacent groups tab are as follows: adjacent between same group of tab
The spacing L1 of 2 tabs of spacing L2 and every centering of two pairs of tabs is respectively the working width of two cutting dies of group, by this group of knife
Molding after mould cross cutting is primary, later group cutting die are more corresponding long Δ d, the π Δ of 0 < Δ d < 2 t × m than previous group cutting die.
A kind of preparation method for the pole piece being as previously described for coiled lithium ion battery comprising following steps:
Method is die cut using hardware cutting die or mode of laser cutting method is die cut, obtains the multi pole ears coiled lithium ion battery
Pole piece.
Preferably, when n=1 group, the hardware cutting die cross cutting method includes the following steps:
S1, the space D for adjusting two cutting dies, make it be less than W；
S2, one end of pole piece is aligned with the front end of first cutting die；
S3, setting process count cnt=0；
S4, pole piece are gone ahead with L1+L2+D；
S5, it is die cut using second cutting die；
S6, pole piece are gone ahead with W+cnt × t-D；
S7, it is die cut using first cutting die；
S8, pole piece are gone ahead with W+cnt × t；
S9, setting process count, and enabling cnt is cnt+1；
S10, S4 ~ S9 process is repeated until terminating；
Wherein, W is the width of first tab, and process is counted as the running parameter of cycle counter, L1For first knife
Mould Breadth degree, L2For second cutting die width, L1≠L2。
It is a kind of to utilize lithium ion battery cell made of pole piece coiling above-mentioned comprising battery core body and two electrodes,
Each electrode is made of two and half electrodes being oppositely arranged, and has interval between two half electrodes, and is in mirror surface
Symmetrically.
Preferably, the battery core body is wound by pole piece ontology, and half electrode is wound by tab.
Preferably, in half electrode, the width of tab is sequentially reduced from outer ring to inner ring, and is in center pair
Claim.
A kind of preparation method of lithium ion battery cell as the aforementioned comprising following steps:
Two layers of pole piece and two layers diaphragm is interspersed by superposition, the tabs of all pole pieces is controlled towards the same side, wound N circle
After form, wherein N >=2.
A kind of lithium ion battery being made of lithium ion battery cell above-mentioned.
Compared with prior art, the present invention have it is following the utility model has the advantages that
In the present invention by way of doubling tab number, that is, it is provided with the tab of two arranged opposites, it both can be with
Shorten cutting die length to improve processing and the accuracy of manufacture；The current carrying area of tab can be increased again, promote power of battery performance；Together
When, it needs to be die cut twice this approach avoid cross cutting region in conventional method and leads to the problem of spine step, electricity is greatly reduced
Pond self-discharge rate.
Detailed description of the invention
Upon reading the detailed description of non-limiting embodiments with reference to the following drawings, other feature of the invention,
Objects and advantages will become more apparent upon:
Fig. 1 is the structural schematic diagram for the pole piece that embodiment 1 provides in the present invention；
Fig. 2 is the structural schematic diagram for the pole piece that embodiment 3 provides in the present invention；
Fig. 3 is the structural schematic diagram for the lithium ion battery cell that embodiment 4 obtains in the present invention；
Fig. 4 is the structural schematic diagram for the lithium ion battery cell that embodiment 5 obtains in the present invention；
Fig. 5 is the coated structure schematic diagram of pole piece in the prior art；
Fig. 6 is the coated structure schematic diagram of the pole piece in the present invention.
Specific embodiment
The present invention is described in detail combined with specific embodiments below.Following embodiment will be helpful to the technology of this field
Personnel further understand the present invention, but the invention is not limited in any way.It should be pointed out that the ordinary skill of this field
For personnel, without departing from the inventive concept of the premise, various modifications and improvements can be made.These belong to the present invention
Protection scope.
Embodiment 1
As shown in Figure 1, present embodiments providing a kind of pole piece of coiling type lithium ionic cell core, including pole piece ontology
3, it is 1 group that pole piece ontology 3, which is equipped with 12 tabs, 31,12 tabs 31 to divide, there is 6 pairs of tabs, 2 tabs of every centering in the group
Width it is equal, the tab width of adjacent two pairs of tabs successively increases 0.867mm, and the spacing between adjacent two pairs of tabs is respectively
34.956mm, the spacing between two tabs of every centering is 8.522mm, in order to guarantee the continuity of production line, the last one
The width of tab 31 is slightly narrower than another tab 31 of the centering.
Embodiment 2
The hardware cutting die cross cutting method for present embodiments providing a kind of pole piece of embodiment 1, includes the following steps:
S1, the space D=3mm for adjusting two cutting dies, make it be less than W=4mm；
S2, one end of pole piece is aligned with the front end of first cutting die；
S3, setting process count cnt=0；
S4, pole piece are gone ahead with L1+L2+D=8.522+34.956+3=46.478mm；
S5, it is die cut using second cutting die；
S6, pole piece are gone ahead with W+cnt × t-D=4+cnt*0.276-3；
S7, it is die cut using first cutting die；
S8, pole piece are gone ahead with W+cnt × t；
S9, setting process are counted as cnt=cnt+1；
S10, S4 ~ S9 process is repeated until terminating.
Wherein, W is the width of first tab, and process is counted as the running parameter of cycle counter, L1For first knife
Mould Breadth degree, L2For second cutting die width, L1≠L2。
Embodiment 3
As shown in Fig. 2, present embodiments providing a kind of pole piece of coiling type lithium ionic cell core, including pole piece ontology
3, pole piece ontology is equipped with 14 tabs 31, is divided into 2 groups, there is 10 tabs 31 in first group, there is 4 tabs in second group, the
It is 5 pairs that 10 tabs 31 in one group, which divide, and the width of 2 tabs of every centering is equal, and the tab width of adjacent two pairs of tabs increases
Adding 0.7mm, the spacing between adjacent two pairs of tabs is respectively 29.2mm, and the spacing between two tabs of every centering is 5.6mm,
In order to guarantee the continuity of production line, the width of the last one tab 31 is narrower than another tab 31 of the centering in first group；
It is 2 pairs that 4 tabs 31 in second group, which divide, and the width of 2 tabs 31 of every centering is equal, and the tab of adjacent two pairs of tabs 31 is wide
Degree increases 0.7mm, and the spacing between adjacent two pairs of tabs 31 is respectively 32.7mm, the spacing between two tabs 31 of every centering
For 9mm, in order to guarantee the continuity of production line, another tab 31 of the width of second group of the last one tab 31 than the centering
It is narrow.
Embodiment 4
Lithium ion battery battery made of pole piece coiling is prepared as embodiment 1 as shown in figure 3, present embodiments providing one kind
Core, including battery core body 1 and two electrodes 2, each electrode 2 are made of two and half electrodes being oppositely arranged, and two described half
There is interval, and symmetrical in mirror surface between electrode.Battery core body 1 is wound by pole piece ontology 3, and half electrode is by tab 31
It winds.In half electrode, the width of tab is sequentially reduced from outer ring to inner ring, and is centrosymmetric.
Specific winding method are as follows:
One, two kinds of pole pieces are made respectively, and positive electrode active materials and negative electrode active are respectively applied on the surface of two kinds of pole pieces
After material, hardware is die cut to obtain multiple tabs, and tab and spacing can be obtained according to battery core power and working condition come flexible design
To anode pole piece and cathode pole piece, the tab width for controlling anode pole piece is successively increased as circle number increases, and same circle
Tab is of same size, its difference of tab width of difference circle are arithmetic progression, tolerance 0.867mm, tolerance=π t, wherein t
For anode pole piece thickness++ two layers membrane thicknesses of cathode pole piece thickness；The tab change width rule of cathode pole piece and positive phase
Together, the tab in same number of turns is of same size, and tolerance and anode are also identical.The width of the initial tab of positive and negative anodes can be according to battery core
Conveyance capacity designs.
Two, anode pole piece, cathode pole piece and two layers of diaphragm is interspersed by superposition, the tab of all pole pieces is controlled towards together
Side forms after two circle of winding, and when winding should be noted: after determining tab width, guaranteeing the whole degree of winding, needs every
One circle has a pair of of tab, and the distance between two tabs of first lap and identical, the length of the distance between second two tabs of circle
For 34.956mm, and so on；Distance and second circle second pole of second tab of first lap to second first tab of circle
The distance of ear to first tab of third circle is identical, length 8.522mm, and so on, each spacing is primary i.e. by cross cutting
It is formable, and if shaped by hardware cross cutting, need two width cutting dies.It is preceding due to needing to guarantee the continuity of technical process
The pole piece of one battery core needs and the pole piece of the latter battery core is continuous.
After obtaining the positive and negative anodes pole piece of different tabs and spacing, positive and negative anodes pole piece is by circular winding pin, and centre is by two
Layer diaphragm, which separates winding, becomes battery core, and tab is located at the same side after winding.The main structure of battery core as shown in Fig. 2, first layer every
Film, cathode pole piece, second layer diaphragm and anode pole piece coiling needle wind the battery core to be formed, and positive and negative anodes respectively have two groups of tabs, and every group
There are multiple tabs, after winding, tab is evenly distributed on volume needle, final battery core is obtained after hot pressing, due to battery
There are two tabs of same size for each circle, and symmetrical in mirror surface after winding, the differentiation with current rectangular cell AB core has one
Fixed difference can reduce the mechanism setting of winding apparatus in this way, increase the simplicity of technique.
Embodiment 5
Lithium ion battery battery made of pole piece coiling is prepared as embodiment 3 as shown in figure 4, present embodiments providing one kind
Core, including battery core body 1 and two electrodes 2, each electrode 2 are made of two and half electrodes being oppositely arranged, and two described half
There is interval, and symmetrical in mirror surface between electrode.Battery core body 1 is wound by pole piece ontology 3, and half electrode is by tab 31
It winds.In half electrode, the width of tab is sequentially reduced from outer ring to inner ring in each group, and is centrosymmetric, when
After the group is wound, the width of next group of repetition tab is sequentially reduced from outer ring to inner ring, and the relationship being centrosymmetric.
In terms of the coating method of pole piece, pole piece of the invention is in such a way that full coat covers, as shown in Figure 5 and Figure 6, Fig. 5
It is the schematic diagram of the prior art, needs to apply insulating layer coating 34, and sharp step 35 can be generated, Fig. 6 is the technology of the present invention, can
To be covered in tab ontology 3 using full coat, energy density is high, and does not have sharp steps, reduces self-discharge rate, promotes safety.
Specific embodiments of the present invention are described above.It is to be appreciated that the invention is not limited to above-mentioned
Particular implementation, those skilled in the art can make various deformations or amendments within the scope of the claims, this not shadow
Ring substantive content of the invention.
Claims (7)
1. a kind of pole piece for coiled lithium ion battery, which is characterized in that including pole piece ontology, set on the pole piece ontology
There are several tabs, several tabs are divided into n group, and the quantity of tab is m in every group, and m tab in every group is divided into m/2
It is right, 2 tabs of every centering it is of same size, the spacing between 2 tabs of every centering is equal, be L1, adjacent two in every group
It is equal to the spacing of tab, it is L2, the width of adjacent two pairs of tabs successively increases Δ L, the surface of the pole piece ontology in every group
It is fully coated with electrode material；
The n >=1,5≤m≤80,5mm≤L1≤ 280mm, 5mm≤L2≤ 280mm, Δ L=π Δ t, wherein Δ t be two layers every
The sum of film, anode pole piece, thickness of cathode pole piece；
The preparation method of the pole piece for coiled lithium ion battery includes the following steps: to be die cut method using hardware cutting die
It is die cut, obtains multi pole ears coiled lithium ion battery pole piece；
The hardware cutting die cross cutting method includes the following steps:
S1, the space D for adjusting two cutting dies, make it be less than W；
S2, one end of pole piece is aligned with the front end of first group of first cutting die；
S3, setting process count cnt=0；
S4, pole piece are gone ahead with L1+L2+D；
S5, it is die cut using second cutting die；
S6, pole piece are gone ahead with W+cnt × Δ t-D；
S7, it is die cut using first cutting die；
S8, pole piece are gone ahead with W+cnt × Δ t；
S9, setting process count, and enabling cnt is cnt+1；
S10, S4~S9 process is repeated until the group terminates；
S11, switching cutting die are next group, repeat S3 to S10 process, to the last one group of process terminates；
Wherein, W is the width of first tab, and process is counted as the running parameter of cycle counter, L1It is wide for first cutting die
Degree, L2For second cutting die width, L1≠L2。
2. being used for the pole piece of coiled lithium ion battery as described in claim 1, which is characterized in that between two adjacent groups tab
Spacing changing rule are as follows: the spacing L of adjacent two pairs of tabs between same group of tab2With the spacing L of 2 tabs of every centering1
The respectively working width of two cutting dies of group, by the primary rear molding of this group of cutting die cross cutting, later group cutting die is than previous group cutting die
Corresponding long Δ d, the π Δ of 0 < Δ d < 2 t × m.
3. a kind of battery core using lithium ion battery made of pole piece coiling described in claim 1, which is characterized in that including electricity
Core ontology and two electrodes, each electrode are made of two and half electrodes being oppositely arranged, between two half electrodes
With interval, and it is symmetrical in mirror surface.
4. the battery core of lithium ion battery as claimed in claim 3, which is characterized in that the battery core body is wound by pole piece ontology
It forms, half electrode is wound by tab.
5. the battery core of lithium ion battery as claimed in claim 3, which is characterized in that in half electrode, the width of tab by
Outer ring is sequentially reduced to inner ring, and is centrosymmetric.
6. a kind of preparation method of the battery core of lithium ion battery as claimed in claim 3, which is characterized in that including walking as follows
It is rapid:
Two layers of pole piece and two layers diaphragm is interspersed by superposition, control the tabs of all pole pieces towards the same side, after wound N circle at
Type, wherein N >=2.
7. a kind of lithium ion battery that the battery core by lithium ion battery as claimed in claim 3 forms.
Priority Applications (6)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810806185.3A CN108461811B (en) | 2018-07-20 | 2018-07-20 | Pole piece and battery cell for coiled lithium ion battery |
| US16/649,622 US11322807B2 (en) | 2018-07-20 | 2019-02-28 | Electrode plate and battery cell of wound lithium-ion battery and method for manufacturing same |
| JP2020543688A JP7132672B2 (en) | 2018-07-20 | 2019-02-28 | Electrode sheet and battery cell for wound type lithium ion battery, and manufacturing method thereof |
| PCT/CN2019/076424 WO2020015362A1 (en) | 2018-07-20 | 2019-02-28 | Electrode plate and battery cell of wound lithium-ion battery and method for manufacturing same |
| KR1020207011498A KR20210031849A (en) | 2018-07-20 | 2019-02-28 | Electrode plate and battery cell of wound lithium-ion battery and manufacturing method thereof |
| EP19837667.5A EP3694043A4 (en) | 2018-07-20 | 2019-02-28 | Electrode plate and battery cell of wound lithium-ion battery and method for manufacturing same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810806185.3A CN108461811B (en) | 2018-07-20 | 2018-07-20 | Pole piece and battery cell for coiled lithium ion battery |
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| CN108461811A CN108461811A (en) | 2018-08-28 |
| CN108461811B true CN108461811B (en) | 2019-11-05 |
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| EP3694043A4 (en) * | 2018-07-20 | 2021-07-07 | Ruipu Energy Co., Ltd. | Electrode plate and battery cell of wound lithium-ion battery and method for manufacturing same |
| JP7208209B2 (en) * | 2020-11-09 | 2023-01-18 | プライムプラネットエナジー＆ソリューションズ株式会社 | battery |
| CN114156545A (en) * | 2021-10-22 | 2022-03-08 | 天津空间电源科技有限公司 | Stepped integrally-formed tab winding type lithium ion battery and preparation method thereof |
| CN114094288B (en) * | 2022-01-19 | 2022-07-05 | 江苏时代新能源科技有限公司 | Wound electrode assembly, battery cell, battery and electric equipment |
| CN115842093B (en) * | 2022-05-07 | 2024-01-05 | 宁德时代新能源科技股份有限公司 | Pole piece, manufacturing method, electrode assembly, manufacturing method, battery cell and battery |
| CN117239361A (en) * | 2023-11-10 | 2023-12-15 | 瑞浦兰钧能源股份有限公司 | Battery cell, battery pole piece and preparation method of battery |
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Address after: 325000 room 923, building a, Qingshan headquarters building, No. 2666, Longxiang Road, Longwan District, Wenzhou City, Zhejiang Province Patentee after: Ruipu Lanjun Energy Co.,Ltd. Patentee after: Shanghai ruipuqing innovative energy Co., Ltd Address before: 325000 room 923, building a, Qingshan headquarters building, No. 2666, Longxiang Road, Longwan District, Wenzhou City, Zhejiang Province Patentee before: RUIPU ENERGY Co.,Ltd. Patentee before: Shanghai ruipuqing innovative energy Co., Ltd |