CN103367702B - Lithium ion battery pole piece and lithium ion battery comprising pole piece - Google Patents
Lithium ion battery pole piece and lithium ion battery comprising pole piece Download PDFInfo
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- CN103367702B CN103367702B CN201310302232.8A CN201310302232A CN103367702B CN 103367702 B CN103367702 B CN 103367702B CN 201310302232 A CN201310302232 A CN 201310302232A CN 103367702 B CN103367702 B CN 103367702B
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- pole piece
- lobe
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- depressed part
- lithium ion
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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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Abstract
The invention belongs to the technical field of lithium ion battery, and especially relates to a lithium ion battery pole piece. The pole piece comprises a current collector and an active substance layer arranged on the surface of the current collector. A plurality of protrusions and recesses are arranged on the active substance layer. Compared with prior art, According to the invention, the protrusions and recesses are arranged on the active substance layer, such that a pole piece with a unique convex-concave structure is formed. During the battery application process, when anode pole piece volume expansion occurs, the shape of a corresponding cathode pole piece is basically maintained, such that anode pole piece expansion can be limited and induced, such that anode pole piece expansion degree and irregularity can be reduced. Therefore, battery appearance deformation and subsequent battery performance deterioration caused by anode expansion can be effectively inhibited. Therefore, the pole piece has an important significance upon lithium ion battery quality and service life. Also, the invention discloses a lithium ion battery comprising the pole piece.
Description
Technical field
The invention belongs to technical field of lithium ion, more particularly to a kind of electrodes of lithium-ion batteries and comprising the pole piece
Lithium ion battery.
Background technology
The anode expansion accumulation that lithium ion battery discharge and recharge causes can produce afterwards to a certain extent battery core appearance deformation, naked
Battery core is internally formed space, causes electrolyte content not enough, deteriorates so as to induce the linksystem of chemical property of battery, shortens lithium
The service life of ion battery.
In order to suppress anode expansion, the stronger binding agent of cohesive force can be adopted to fetter body of the graphite granule after embedding lithium
Product expansion；Or there is the coating of bonding effect by the surface-coated in pole piece or isolating membrane, by anode pole piece and isolating membrane
It is strongly adhered to together, to strengthen the ability of its resistance to deformation.Additionally, also by being limited using the outer rigid housing of high intensity
The method of anode expansion processed.
Although said method can to a certain extent alleviate the adverse effect that anode expansion causes, its focus is
Anode pole piece, for another important component part cathode sheet that lithium ion battery winds structure is not accounted for；In addition, using height
Caking property bonding agent is easily caused pole piece and becomes fragile, and is unfavorable for follow-up winding process；Increase on isolating membrane surface and there is bonding effect
Coating then cause cost to increase.
Pole piece of the prior art（Including cathode sheet and anode pole piece）Section structure schematic diagram as shown in figure 1, its
Including collector 10 and the active material layer 20 for being coated in the surface of collector 10, wherein, the surface of active material layer 20 is smooth
Smooth, when being wound into cathode sheet, isolating membrane and anode pole piece naked battery core and be assembled into battery, anode pole piece is susceptible to
Expansion, and cathode sheet corresponding thereto cannot be limited, and ultimately result in the expansion of whole naked battery core.
In view of this, the lithium ion battery it is necessory to provide a kind of electrodes of lithium-ion batteries and comprising the pole piece, the pole
The characteristics of piece is the winding-structure based on the naked battery core of lithium ion battery and the pole piece with jut and depressed part that designs, it is this
The pole piece of structure can suppress battery core deformation and chemical property deterioration caused by anode expansion, improve the cycle life of battery.
The content of the invention
An object of the present invention is：For the deficiencies in the prior art, and a kind of electrodes of lithium-ion batteries is provided, the pole
The characteristics of piece is the winding-structure based on the naked battery core of lithium ion battery and the pole piece with jut and depressed part that designs, it is this
The pole piece of structure can suppress battery core deformation and chemical property deterioration caused by anode expansion, improve the cycle life of battery.
In order to achieve the above object, the present invention is adopted the following technical scheme that：A kind of electrodes of lithium-ion batteries, the pole piece bag
Include collector and be arranged on the active material layer of the collection liquid surface, several lobe are provided with the active material layer
And depressed part.
Improve as one kind of electrodes of lithium-ion batteries of the present invention, the lobe and the depressed part compartment of terrain are distributed in
The active material layer.
Improve as one kind of electrodes of lithium-ion batteries of the present invention, the lobe and the depressed part are along the active matter
The width of matter layer is spaced apart.
Improve as one kind of electrodes of lithium-ion batteries of the present invention, the distance between two neighboring described lobe with it is adjacent
The distance between two depressed parts are equal.
Improve as one kind of electrodes of lithium-ion batteries of the present invention, the depth of the height of the lobe and the depressed part
Be the active material layer thickness 1/20 ~ 1/50.The height of lobe and the depth of depressed part（Or referred to as fluctuating width
Degree）It is too little, it is not easy to form more close " interlocking " structure between cathode sheet and anode pole piece, it is impossible to realize regulation and control
The effect of the stress produced by anode pole piece expansion；Relief intensity is too big then easily to form the excessive region of compacted density, causes
The compacted density difference of pole piece layer is excessive, and anode analysis lithium problem is easily produced when high current charges and low temperature charges,
Affect the security performance of battery.
Improve as one kind of electrodes of lithium-ion batteries of the present invention, the depth of the height of the lobe and the depressed part
Be the active material layer thickness 1/20 ~ 1/30, this is preferred scope.
Improve as one kind of electrodes of lithium-ion batteries of the present invention, the length of the length of the lobe and the depressed part
Be the active material layer width 1/5 ~ 1/15.The length of lobe and depressed part is too little, then be unfavorable for when winding
Operation is controlled, and the length of lobe and depressed part is oversize, is unfavorable for forming close-fitting " interlocking " structure.
Improve as one kind of electrodes of lithium-ion batteries of the present invention, the length of the length of the lobe and the depressed part
Be the active material layer width 1/10, this is preferred scope.
Improve as one kind of electrodes of lithium-ion batteries of the present invention, the shape of the cross section of the lobe and the depressed part
Shape is circle, ellipse, rectangle or rhombus.
Relative to prior art, winding-structure feature of the present invention based on the naked battery core of lithium ion battery, by pole piece
Lobe and depressed part are set on active material layer, so as to form a kind of pole piece with " relief fabric " of uniqueness（Including the moon
Pole pole piece and anode pole piece）, when the cathode sheet and anode pole piece are wound into into naked battery core with isolating membrane, cathode sheet and sun
Pole pole piece can form " interlocking " structure.The naked battery core is assembled into after battery, during the use of battery, works as anode pole piece
During generation volumetric expansion, because cathode sheet corresponding thereto keeps original shape invariance substantially, such that it is able to limiting and inducing
The expansion of anode pole piece, so as to reduce the degree and irregularities of anode expansion.From in structure, whole piece sun in lithium ion battery
Some small expansion areas are resolved in the macroscopic view expansion of pole pole piece with being broken the whole up into parts, and each small expansion area is subject to most
The restriction of " relief fabric " of the cathode sheet of neighbour so that it cannot be from macroscopically forming larger cumulative function.Therefore, originally
The pole piece of invention can effectively suppress due to anode expansion caused by battery appearance deformation and further battery penalty ask
Topic, for the quality and service life that improve lithium ion battery have great importance.
The pole piece of the present invention can be applicable to flexible packing lithium ion battery, hard packaging lithium ionic cell and cylindrical lithium ion cell
Pond.And, the commercial applications of the pole piece of the invention alloy anode more serious for expansion have important value.
Further object is that provide a kind of lithium ion battery, including cathode sheet, anode pole piece, it is arranged at
Isolating membrane and electrolyte between the cathode sheet and the anode pole piece, the cathode sheet and the anode pole piece it is equal
For electrodes of lithium-ion batteries of the present invention, and the lobe phase of the depressed part of the cathode sheet and the anode pole piece
To arranging, the lobe of the cathode sheet is oppositely arranged with the depressed part of the anode pole piece.
Relative to prior art, the present invention is made by the cooperation of the cathode sheet and anode pole piece that are respectively provided with " relief fabric "
With, the characteristics of make full use of " relief fabric " on cathode sheet surface to keep original shape to be basically unchanged in electrochemical process,
Embedding lithium expansion generation to the same anode pole piece with surface " relief fabric " is pind down, adjusted and inducing action.From in structure
See, some small expansion areas are resolved in the macroscopic view expansion of whole piece anode pole piece in lithium ion battery with being broken the whole up into parts, often
Individual small expansion area is limited by the relief fabric of the cathode sheet of arest neighbors so that its cannot from macroscopically formed compared with
Big cumulative function.Therefore, surface interlock structure proposed by the present invention can effectively suppress due to electricity caused by anode expansion institute
The problem of pond appearance deformation and further battery penalty, for improve lithium ion battery quality and service life have it is important
Meaning.
Additionally, the setting of the cathode sheet of the present invention and anode pole piece upper projecting portion and depressed part causes to be defined on pole piece
The secondary channel of multiple narrower widths, during injecting electrolytic solution, electrolyte increases with the contact area of pole piece, is conducive to electricity
Solution liquid fills up rapidly the space between anode pole piece, cathode sheet and isolating membrane by capillarity, such that it is able to shorten fluid injection
Time of repose afterwards, improves fluid injection efficiency and naked battery core effect of impregnation in the electrolytic solution, advantageously forms uniform, consistent
SEI films, improve the concordance of battery core capacity.
Description of the drawings
Fig. 1 is the section structure schematic diagram of electrodes of lithium-ion batteries of the prior art.
Wherein 10- collectors, 20- active material layers.
The section structure schematic diagram of the electrodes of lithium-ion batteries that Fig. 2 is provided for the present invention.
Fig. 3 is that the section structure of the battery core that the cathode sheet in the present invention is wound into anode pole piece and isolating membrane is illustrated
Figure.
Wherein, 1- collectors, 2- active material layers, 21- lobe, 22- depressed parts, 30- cathode sheets, 40- anodes pole
Piece, 50- isolating membrane.
Fig. 4 is that the battery that embodiment 6 and comparative example 2 are provided completely is filling and the thickness changing trend during loop test.
Thickness of the Fig. 5 for embodiment 6 and the battery of the offer of comparative example 2 during loop test increases percentage ratio, with full
On the basis of filling thickness.
Specific embodiment
In order that the purpose of the present invention, technical scheme and Advantageous Effects become apparent from, below in conjunction with accompanying drawing and specifically
Embodiment, is described in further detail to the present invention.It should be appreciated that the specific embodiment described in this specification
Just for the sake of explaining the present invention, it is not intended to limit the present invention.
The invention provides a kind of electrodes of lithium-ion batteries.
Embodiment 1, as shown in Fig. 2 the present embodiment provide a kind of electrodes of lithium-ion batteries, the pole piece include collector 1
With the active material layer 2 for being arranged on the surface of collector 1, several lobe 21 and depressed part 22 are provided with active material layer 2.
The lobe 21 and the compartment of terrain of depressed part 22 are distributed on the width of active material layer 2, and two adjacent lobe
The distance between the distance between 21 depressed parts 22 adjacent with two are equal, the height of lobe 21 and the depth of depressed part 22
Be active material layer 2 thickness 1/30, the length of lobe 21 and the length of depressed part 22 are the width of active material layer 2
The shape of the cross section of the 1/10 of degree, lobe 21 and depressed part 22 is circle.
Embodiment 2, as different from Example 1：The height of lobe 21 and the depth of depressed part 22 are active substance
The 1/40 of the thickness of layer 2, the length of lobe 21 and the length of depressed part 22 are the 1/7 of the width of active material layer 2, raised
The shape of the cross section of portion 21 and depressed part 22 is ellipse.
Remaining is repeated no more here with embodiment 1.
Embodiment 3, as different from Example 1：The height of lobe 21 and the depth of depressed part 22 are active substance
The 1/50 of the thickness of layer 2, the length of lobe 21 and the length of depressed part 22 are the 1/15 of the width of active material layer 2, convex
The shape for playing the cross section of portion 21 and depressed part 22 is rectangle.
Remaining is repeated no more here with embodiment 1.
Embodiment 4, as different from Example 1：The height of lobe 21 and the depth of depressed part 22 are active substance
The 1/20 of the thickness of layer 2, the length of lobe 21 and the length of depressed part 22 are the 1/5 of the width of active material layer 2, raised
The shape of the cross section of portion 21 and depressed part 22 is rhombus.
Remaining is repeated no more here with embodiment 1.
Embodiment 5, as different from Example 1：The height of lobe 21 and the depth of depressed part 22 are active substance
The 1/25 of the thickness of layer 2, the length of lobe 21 and the length of depressed part 22 are the 1/12 of the width of active material layer 2, convex
The shape for playing the cross section of portion 21 and depressed part 22 is circle.
Remaining is repeated no more here with embodiment 1.
The pole piece of lithium ion battery of the present invention uses conventional production and manufacture method, and difference is to roll work
Skill：There is the milling roller of lobe and depressed part using surface, dried pole piece is carried out to roll process so that through rolling
Pole piece there is corresponding lobe 21 and depressed part 22.The length of lobe 21 and depressed part 22 is respectively by milling roller table
The depressed part in face and the length of lobe determine that the height of lobe 21 and the depth of depressed part 22 are respectively by year roller surface
The depth of depressed part and the height of lobe are determined.
Comparative example 1, the section structure schematic diagram of the pole piece of the lithium ion battery that this comparative example is provided is as shown in figure 1, its bag
Include collector 10 and be coated in the active material layer 20 on the surface of collector 10, wherein, the surface of active material layer 20 is smooth light
Sliding.
Present invention also offers a kind of lithium ion battery.
Embodiment 6, the lithium ion battery that the present embodiment is provided includes cathode sheet 30, anode pole piece 40, is arranged at negative electrode
Isolating membrane 50 and electrolyte between pole piece 30 and anode pole piece 40, wherein, cathode sheet 30 and anode pole piece 40 are reality
The electrodes of lithium-ion batteries of the offer of example 1 is provided, and the depressed part 22 of cathode sheet 30 is relative with the lobe 21 of anode pole piece 40
Arrange, the lobe 21 of cathode sheet 30 is oppositely arranged with the depressed part 22 of anode pole piece 40.By cathode sheet 30 and anode pole
The section structure schematic diagram of the battery core that piece 40 and isolating membrane 50 are wound into is as shown in figure 3, due to cathode sheet 30 and anode pole piece
40 structural parameters are mutually matched, therefore, wound using the cathode sheet 30 and anode pole piece 40 and isolating membrane 50 and formed
Battery core in, cathode sheet 30 and anode pole piece 40 are closely adhered to the both sides of isolating membrane 50.
Embodiment 7, as different from Example 6：The cathode sheet 30 and anode of the lithium ion battery that the present embodiment is provided
Pole piece 40 is the electrodes of lithium-ion batteries of the offer of embodiment 2.
Remaining is repeated no more here with embodiment 6.
Embodiment 8, as different from Example 6：The cathode sheet 30 and anode of the lithium ion battery that the present embodiment is provided
Pole piece 40 is the electrodes of lithium-ion batteries of the offer of embodiment 3.
Remaining is repeated no more here with embodiment 6.
Embodiment 9, as different from Example 6：The cathode sheet 30 and anode of the lithium ion battery that the present embodiment is provided
Pole piece 40 is the electrodes of lithium-ion batteries of the offer of embodiment 4.
Remaining is repeated no more here with embodiment 6.
Embodiment 10, as different from Example 6：The cathode sheet 30 and anode of the lithium ion battery that the present embodiment is provided
Pole piece 40 is the electrodes of lithium-ion batteries of the offer of embodiment 5.
Remaining is repeated no more here with embodiment 6.
Wherein, the lithium ion battery described in the present invention both can be flexible packing lithium ion battery, can be again rigid package lithium
Ion battery and cylindrical lithium ion battery.Anode active material in anode pole piece 40 both can be graphite, or silicon
Alloy, tin alloy etc., or graphite and silicon alloy, the mixture of tin alloy etc..
Comparative example 2, as different from Example 6：The cathode sheet of the lithium ion battery that the present embodiment is provided and anode pole
Piece is the electrodes of lithium-ion batteries of the offer of comparative example 1.
Remaining is repeated no more here with embodiment 6.
The battery that embodiment 6-10 and comparative example 2 are provided is at low temperature（-12oC）After completely filling, disassemble in drying shed,
As a result find：Anode in the battery that the analysis lithium degree of the anode pole piece 40 in the battery of embodiment 6-10 is provided with comparative example 2
The analysis lithium degree of pole piece is sufficiently close to, and especially the depressed part 22 of the anode pole piece 40 in the battery of embodiment 6-10, that is, press
The relatively large part of real density, its analysis lithium degree does not become serious, and this shows the peace of the lithium ion battery of present invention offer
Full performance is not affected because of the change of pole piece structure.
Electrochemistry capacitance test is carried out to the battery that embodiment 6-10 and comparative example 2 are provided, as a result shows the electricity of embodiment
The capacity in pond does not have notable difference with the capacity of the battery of comparative example.This shows the hypovolemic of the lithium ion battery of present invention offer
Can not be affected because of the change of pole piece structure.
Electrochemistry capacitance loop test is carried out to the battery that embodiment 6 and comparative example 2 are provided, and is surveyed in the circulation per 100 times
The thickness of battery core is measured after examination, as a result as shown in figure 4, while calculating thickness of the battery in capacity circulating test process increases by hundred
Divide ratio（On the basis of cell thickness during completely filling）, acquired results are as shown in Figure 5.By Figure 4 and 5 it can be seen that：Do not changing the moon
Under conditions of the coating weight of pole pole piece 30 and anode pole piece 40, embodiment 6 provide battery original depth be larger than it is right
The battery that ratio 2 is provided；But after 200 loop tests, the thickness of the battery that embodiment 6 is provided is carried less than comparative example 2
For battery, and the trend is obvious all the more as loop test number of times further increases：The thickness of the battery that embodiment 6 is provided exists
It is not significantly increased after 600 loop tests, and with the increase of loop test number of times, the thickness of the battery of the offer of embodiment 6
Degree increase tends towards stability.After 600 capacity circulating tests, the thickness increase only 5% or so of the battery of embodiment 6 is remote low
The thickness for providing 30% or so of battery in comparative example 2 increases.The result shows：The lithium ion battery that the present invention is provided is suppressing
Anode expansion aspect has a significant effect, and it can suppress the adverse effect produced by anode expansion, become for battery core is prevented
Shape has important effect.
It should be noted that：Although only giving lobe 21 and the distribution of the compartment of terrain of depressed part 22 in embodiments of the invention
Example on active material layer 2, but lobe 21 and depressed part 22 can be with lobe 21- lobe 21- depressed part 22-
The distribution form of depressed part 22- lobe 21 etc is distributed on active material layer 2；Although being only given in embodiments of the invention
Lobe 21 and depressed part 22 compartment of terrain are distributed in the example on the width of active material layer 2, but lobe 21 and recessed
Sunken portion 22 can be distributed on the length direction of active material layer 2 with compartment of terrain；Although only giving in embodiments of the invention
The distance between the distance between two adjacent lobe 21 depressed part 22 adjacent with two equal example, but two
The distance between the distance between adjacent lobe 21 depressed part 22 adjacent with two can also be unequal.As long as ensureing
When cathode sheet 30, isolating membrane 50 and anode pole piece 40 are wound into into battery core, the lobe 21 on cathode sheet 30 just to be
Depressed part on anode pole piece 40, the depressed part 22 on cathode sheet 30 just to be lobe 30 on anode pole piece 40 i.e.
Can.
It can further be stated that：The pole piece structure that the present invention is provided can be widely applied to lithium ion battery electrode piece
Design and production, but be not limited to the design of lithium ion battery electrode piece and production, for knowing those skilled in the art
For, the present disclosure applies equally to need other association areas of the penalty to controlling expansion and causing due to expansion.
The description and instruction of book according to the above description, those skilled in the art in the invention can also be to above-mentioned embodiment party
Formula carries out appropriate change and modification.Therefore, the specific embodiment for being described above and indicating is the invention is not limited in, to this
Some modifications and changes of invention should also be as including in scope of the claims of the invention.Although additionally, this specification
Used in some specific terms, but these terms are merely for convenience of description, do not constitute any restriction to the present invention.
Claims (7)
1. a kind of electrodes of lithium-ion batteries, the pole piece includes collector and is arranged on the active substance of the collection liquid surface
Layer, it is characterised in that：Several lobe and depressed part are provided with the active material layer；The lobe and the depression
Portion compartment of terrain is distributed in the active material layer；The distance between two neighboring described lobe and the two neighboring depressed part
The distance between it is equal；The depth of the height of the lobe and the depressed part is the 1/ of the thickness of the active material layer
20~1/50；The electrodes of lithium-ion batteries includes cathode sheet and anode pole piece, and cathode sheet and anode pole piece can be formed
" interlocking " structure.
2. the electrodes of lithium-ion batteries according to claim 1, it is characterised in that：The lobe and the depressed part edge
The width of the active material layer is spaced apart.
3. electrodes of lithium-ion batteries according to claim 1, it is characterised in that：The height of the lobe and the depression
The depth in portion is the 1/20 ~ 1/30 of the thickness of the active material layer.
4. the electrodes of lithium-ion batteries according to claim 2, it is characterised in that：The length of the lobe and described recessed
The length in sunken portion is the 1/5 ~ 1/15 of the width of the active material layer.
5. the electrodes of lithium-ion batteries according to claim 4, it is characterised in that：The length of the lobe and described recessed
The length in sunken portion is the 1/10 of the width of the active material layer.
6. the electrodes of lithium-ion batteries according to claim 1, it is characterised in that：The lobe and the depressed part
The shape of cross section is circle, ellipse, rectangle or rhombus.
7. a kind of lithium ion battery, including cathode sheet, anode pole piece, the cathode sheet and the anode pole piece are arranged at
Between isolating membrane and electrolyte, it is characterised in that：The cathode sheet and the anode pole piece are claim 1 to 6 times
Meaning one described in electrodes of lithium-ion batteries cathode sheet and anode pole piece, and the depressed part of the cathode sheet with it is described
The lobe of anode pole piece is oppositely arranged, and the lobe of the cathode sheet is oppositely arranged with the depressed part of the anode pole piece.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201310302232.8A CN103367702B (en) | 2013-07-18 | 2013-07-18 | Lithium ion battery pole piece and lithium ion battery comprising pole piece |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310302232.8A CN103367702B (en) | 2013-07-18 | 2013-07-18 | Lithium ion battery pole piece and lithium ion battery comprising pole piece |
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| CN103367702A CN103367702A (en) | 2013-10-23 |
| CN103367702B true CN103367702B (en) | 2017-05-03 |
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Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107403904B (en) * | 2016-05-18 | 2020-03-27 | 宁德时代新能源科技股份有限公司 | Lithium ion battery and negative plate thereof |
| KR102056455B1 (en) * | 2016-07-15 | 2019-12-16 | 주식회사 엘지화학 | Negative electrode and secondary battery comprising the negative electrode |
| CN106654286B (en) * | 2016-11-18 | 2019-06-11 | 浙江大学 | A kind of flexible electrode and preparation method thereof |
| CN111916627A (en) * | 2020-07-14 | 2020-11-10 | 东莞塔菲尔新能源科技有限公司 | Lithium ion battery and diaphragm thereof |
| CN113285052A (en) * | 2021-05-06 | 2021-08-20 | 路华置富电子(深圳)有限公司 | Positive plate, manufacturing method thereof and battery |
| CN113285053A (en) * | 2021-05-06 | 2021-08-20 | 路华置富电子(深圳)有限公司 | Negative plate, manufacturing method thereof and battery |
| WO2022236489A1 (en) * | 2021-05-08 | 2022-11-17 | 宁德新能源科技有限公司 | Battery cell and electrical device |
| CN114335560A (en) * | 2021-12-28 | 2022-04-12 | 珠海冠宇电池股份有限公司 | Pole piece and electrochemical device |
| CN116802826A (en) * | 2022-07-06 | 2023-09-22 | 宁德新能源科技有限公司 | Electrochemical device and electronic device |
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| CN103367702A (en) | 2013-10-23 |
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