CN209183641U - Pole piece, electrode assembly and secondary cell - Google Patents
Pole piece, electrode assembly and secondary cell Download PDFInfo
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- CN209183641U CN209183641U CN201822168388.2U CN201822168388U CN209183641U CN 209183641 U CN209183641 U CN 209183641U CN 201822168388 U CN201822168388 U CN 201822168388U CN 209183641 U CN209183641 U CN 209183641U
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- pole piece
- groove
- guarantor
- active material
- material layer
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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
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- Battery Electrode And Active Subsutance (AREA)
- Secondary Cells (AREA)
Abstract
The utility model provides a kind of pole piece, electrode assembly and secondary cell.Secondary cell includes electrode assembly, and electrode assembly includes the first pole piece, the second pole piece and diaphragm, and diaphragm separates the first pole piece and the second pole piece.First pole piece includes collector, active material layer and guarantor's liquid layer；Active material layer is set to the surface of collector, and active material layer is equipped with groove；Guarantor's liquid layer has pore structure, and guarantor's liquid layer is at least partially disposed in groove.
Description
Technical field
The utility model relates to field of batteries more particularly to a kind of pole pieces, electrode assembly and secondary cell.
Background technique
Secondary cell generally includes electrode assembly and accommodates the shell of electrode assembly, and electrode assembly is then by positive plate, negative
Pole piece and membrane winding form.In the charge and discharge process of secondary cell, volume can occur for pole piece (positive plate and negative electrode tab)
Expansion；And since electrode assembly is limited by shell, so pole piece and diaphragm will receive extruding, cause when pole piece expansion
Electrolyte between positive/negative plate is extruded, and reduces the wellability of positive/negative plate, increases the transfer impedance of lithium ion, influences secondary electricity
The dynamic performance in pond.
Utility model content
In view of the problems in the background art, the purpose of this utility model is to provide a kind of pole piece, electrode assembly and
Secondary cell can discharge the swelling stress of pole piece, guarantee effect of impregnation, improve the performance of secondary cell.
To achieve the goals above, the utility model provides a kind of pole piece, electrode assembly and secondary cell.
Pole piece includes collector, active material layer and guarantor's liquid layer；Active material layer is set to the surface of collector, and living
Property material layer be equipped with groove；Guarantor's liquid layer has pore structure, and guarantor's liquid layer is at least partially disposed in groove.
Guarantor's liquid layer is full of in groove.
Guarantor's liquid layer covers the surface of the separate collector of active material layer.
On the thickness direction of pole piece, the depth of groove is not more than 2/3rds of the thickness of active material layer.
Groove is bar shaped and extends along the width direction of pole piece.
Groove is multiple and length direction arranged for interval along pole piece；On the length direction of pole piece, the multiple groove
Overall width be not more than pole piece total length half.
Groove extends to the edge of active material layer along the end of the width direction of pole piece.
Electrode assembly includes the first pole piece, the second pole piece and diaphragm, and diaphragm separates the first pole piece and the second pole piece.First
At least one in pole piece and the second pole piece is pole piece above-mentioned.
Preferably, the first pole piece and the second pole piece are pole piece above-mentioned, and the groove of the first pole piece and the second pole piece
Groove is opposite.
Secondary cell includes the electrode assembly.
The beneficial effects of the utility model are as follows: in this application, when pole piece expansion, pole piece is swollen suffered by groove
Swollen stress is smaller, and the electrolyte being extruded can be flow in groove；And since guarantor's liquid layer has pore structure, so electrolyte can
To be adsorbed by the guarantor's liquid layer in groove, so that electrolyte be avoided to be extruded electrode assembly.Electrolyte in guarantor's liquid layer can pass through hair
Spy, to guarantee effect of impregnation, avoids the increase of lithium ion transport impedance with penetrating into pole piece again as far as possible, reduces
Expand the influence to secondary cell dynamic performance.In addition, groove can also create cushion space to the pole piece constantly expanded, from
And discharge the swelling stress of pole piece.Meanwhile guarantor's liquid layer can also stablize groove, and groove is avoided to collapse under the action of swelling stress
It collapses.
Detailed description of the invention
Fig. 1 is the schematic diagram according to the electrode assembly of the utility model.
Fig. 2 is the cross-sectional view that A-A makes along Fig. 1.
Fig. 3 is the schematic diagram according to the first embodiment of the pole piece of the utility model.
Fig. 4 is the cross-sectional view that B-B makes along Fig. 3.
Fig. 5 is the schematic diagram according to the second embodiment of the pole piece of the utility model.
Fig. 6 is the schematic diagram according to the 3rd embodiment of the pole piece of the utility model.
Fig. 7 is the cross-sectional view that C-C makes along Fig. 6.
Fig. 8 is the schematic diagram according to the fourth embodiment of the pole piece of the utility model.
Fig. 9 is the schematic diagram according to the 5th embodiment of the pole piece of the utility model.
Wherein, the reference numerals are as follows:
1 first pole piece, 6 guarantor's liquid layer
2 second pole piece G grooves
3 diaphragm X length directions
4 collector Y width directions
5 active material layer Z thickness directions
Specific embodiment
It is with reference to the accompanying drawings and embodiments, right in order to which the objects, technical solutions and advantages of the application are more clearly understood
The application is further elaborated.It should be appreciated that specific embodiment described herein is only used to explain the application, and
It is not used in restriction the application.
In the description of the present application unless specifically defined or limited otherwise, term " first ", " second ", " third " are only
For descriptive purposes, it is not understood to indicate or imply relative importance.Term " multiple " refers to two or more.
Unless otherwise prescribed or illustrate, term " connection ", " fixation " etc. shall be understood in a broad sense, for example, " connection " can be fixed company
It connects, may be a detachable connection, or be integrally connected, or electrical connection or signal connection." connection " can be directly connected,
It can also be indirectly connected through an intermediary.For the ordinary skill in the art, can understand as the case may be
The concrete meaning of above-mentioned term in this application.
In the description of this specification, it is to be understood that the nouns of locality such as "upper", "lower" described in the embodiment of the present application are
With angle shown in the drawings come what is be described, the restriction to the embodiment of the present application should not be construed as.In addition, within a context,
It is also to be appreciated that can not only directly connect when mentioning an element and being connected to another element "upper" or "lower"
Connect another element "upper" perhaps "lower" can also be indirectly coupled to by intermediary element another element "upper" or
"lower".The application is described in further detail below by specific embodiment and in conjunction with attached drawing.
The secondary cell of the application may include electrode assembly, shell, lamina tecti and electrode terminal.Shell can be closed by aluminium or aluminium
Gold is made, and inside is formed with cavity.Electrode assembly and electrolyte are contained in the cavity of shell.Lamina tecti is connected to shell,
Electrode assembly to be enclosed in shell.Electrode terminal is set to lamina tecti and is electrically connected to electrode assembly.
Electrode assembly is the core component that secondary cell realizes charging/discharging function.Referring to Fig.1, the electrode assembly packet of the application
The first pole piece 1, the second pole piece 2 and diaphragm 3 are included, diaphragm 3 separates the first pole piece 1 and the second pole piece 2.Electrode assembly can pass through spiral shell
Rotation ground winds the first pole piece 1, the second pole piece 2 and diaphragm 3 and is formed, and presses to form flat structure by pressure.
The pole piece of the electrode assembly of the application is described in detail with different embodiments below.
In the first embodiment, referring to Fig. 3 and Fig. 4, the first pole piece 1 includes collector 4, active material layer 5 and guarantor's liquid
Layer 6.Active material layer 5 is set to the surface of collector 4, and active material layer 5 is equipped with groove G.Guarantor's liquid layer 6 has hole knot
Structure, and guarantor's liquid layer 6 is at least partially disposed in groove G.
The material of each section of the first pole piece 1 is determined according to the polarity of the first pole piece 1.In the present embodiment, the first pole piece 1
It can be anode pole piece.Collector 4 can be aluminium foil, and active material layer 5 includes LiMn2O4 or LiFePO4 isoreactivity material.
Guarantor's liquid layer 6 includes organic polymer, conductive agent and bonding agent.The organic polymer is Kynoar, poly- second
Alkene pyrrolidone, biasfluoroethylene-hexafluoropropylene polymer, polyacrylonitrile, sodium carboxymethylcellulose, Sodium Polyacrylate, butadiene-
Acrylonitrile polymer, ethyl acetate, polyacrylic acid, polymethyl acrylate, polyethyl acrylate and polyacrylic acid-styrene polymerization
One of object is a variety of.Conductive agent can be carbon nanotube (CNT) or ultra-fine carbon dust (SP).The bonding agent is carboxymethyl cellulose
One of plain sodium, butadiene-styrene rubber, Kynoar, sodium alginate are a variety of.
The following detailed description of the forming process of the first pole piece 1: firstly, by active material (LiMn2O4 or LiFePO4), leading
Electric agent (acetylene black), binder (Kynoar) are uniformly mixed and are added in solvent, and the anode with certain viscosity is made
Slurry；Then, anode sizing agent is applied on aluminium foil with specific technique, forms the activity with groove G after anode sizing agent drying
Material layer 5；Subsequently, organic polymer (such as polyvinylpyrrolidone), conductive agent (such as CNT) and binder (are such as gathered into inclined fluorine
Ethylene) and solvent lotion is made, and be filled into groove G by specific coating process, being formed after the lotion drying has
The guarantor's liquid layer 6 of pore structure.
In the forming process of the first pole piece 1, guarantor's liquid layer can control by adjusting the component and moulding process of guarantor's liquid layer 6
6 porosity.Electrolyte and gas can be transmitted by the hole of guarantor's liquid layer 6.
Referring to Fig. 2, the second pole piece 2 may also comprise collector 4 and active material layer 5, and active material layer 5 is coated on collector
4 surface.The structure and molding mode of second pole piece 2 are similar to the first pole piece 1, and the difference of the two is, the collection of the second pole piece 2
Fluid 4 is usually copper foil, and the active material layer 5 of the second pole piece 2 includes graphite or silicon isoreactivity material.
In the cyclic process of secondary cell, the active material layer 5 of the active material layer 5 of the first pole piece 1 and the second pole piece 2
It will appear expansion；And since the inner space of shell is limited, so the first pole piece 1 and the second pole piece 2 are because of the anti-work by shell
It is firmly extruded, the gap between the first pole piece 1 and the second pole piece 2 is caused to reduce.
In this application, when the first pole piece 1 and the second pole piece 2 expand, expansion that the first pole piece 1 is received at groove G
Stress is smaller, and the electrolyte being extruded can be flow in groove G；And since guarantor's liquid layer 6 has pore structure, so electrolyte can
To be adsorbed by the guarantor's liquid layer 6 in groove G, so that electrolyte be avoided to be extruded electrode assembly.Electrolyte in guarantor's liquid layer 6 can pass through
Capillarity is penetrated into again in the first pole piece 1, to guarantee effect of impregnation, avoids the increasing of lithium ion transport impedance as far as possible
Add, reduces influence of the expansion to secondary cell dynamic performance.In addition, groove G can also be to the first pole piece 1 wound constantly expanded
Cushion space is made, thus the swelling stress of the first pole piece 1 of release.Meanwhile guarantor's liquid layer 6 can also stablize groove G, avoid groove G
Avalanche under the action of swelling stress.
In the cyclic process of secondary cell, gas can be also generated inside electrode assembly；And gas can be via in groove G
Guarantor's liquid layer 6 is transmitted outward, to avoid air accumulation between the first pole piece 1 and the second pole piece 2.
Referring to Fig. 4, it is full of guarantor's liquid layer 6 in groove G, guarantor's liquid layer 6 can be made to adsorb more electrolyte in this way, and more effective
Stablize groove G in ground.Since guarantor's liquid layer 6 has pore structure, when the expansion of the first pole piece 1, guarantor's liquid layer 6 is easy expanding
It is deformed under the action of stress, to discharge swelling stress in time.
On the thickness direction Z of the first pole piece 1, the depth of groove G no more than active material layer 5 thickness three/
Two.Specifically, the depth of groove G can be 1 μm~100 μm, preferably 10 μm~50 μm.If the depth of groove G is smaller,
The cushion space that groove G is created to the first pole piece 1 is limited, can not effectively discharge swelling stress, meanwhile, guarantor's liquid in groove G
6 volume of layer are also limited, can not adsorb enough electrolyte.If the depth of groove G is larger, just need to remove a large amount of living
Property material layer 5, causes the capacity of secondary cell to reduce, influences the energy density of secondary cell.
First pole piece 1 usually requires to wind multi-turn around the wireline reel (perpendicular to the direction of Fig. 1) of electrode assembly, and wireline reel
It is in substantially parallel relationship to the width direction Y of the first pole piece 1.Preferably, groove G is bar shaped and prolongs along the width direction Y of the first pole piece 1
It stretches, can effectively alleviate expansion of first pole piece 1 on length direction X in this way.Accordingly, guarantor's liquid layer 6 is also bar shaped and edge
The width direction Y of first pole piece 1 extends.
In the secondary battery, mainly via electrode assembly, along the end of winding axis direction, (namely Fig. 2 is transversely for electrolyte
End) enter, that is to say, that the end of the width direction Y of the first pole piece 1 and the intracorporal electrolyte contacts of shell.It is therefore preferable that
Ground extends to the edge of active material layer 5 along the end of the width direction Y of the first pole piece 1 referring to Fig. 3, groove G；At this point, groove
G and guarantor's liquid layer 6 each extend to the end of the width direction Y of the first pole piece 1.At this point, the guarantor's liquid layer 6 in groove G can directly inhale
Electrolyte outside attached electrode assembly improves the wellability of electrode assembly to provide the infiltration channel of high speed for electrolyte.
Groove G is multiple and length direction X arranged for interval along pole piece.Multiple groove G can provide multiple cushion spaces, from
And effectively discharge swelling stress；Meanwhile the guarantor's liquid layer 6 in multiple groove G can also form multiple infiltration channels, improve infiltration
Property.
Active material layer 5 for two and can be respectively arranged at two surfaces of collector 4, and each active material layer 5 is equipped with
Groove G；Accordingly, guarantor's liquid layer 6 is equipped in each groove G.The quantity of groove G can also be increased in this way, improve wellability.
On the length direction X of the first pole piece 1, the overall width of the multiple groove G is not more than two points of pole piece total length
One of.It opens up groove G and just needs to remove certain active material layer 5, therefore, if the beam overall on the edge the multiple groove G is spent
Greatly, it will leading to the capacity of secondary cell reduces, and influences the energy density of secondary cell.The width of each groove G can for 0.1 μm~
10mm, preferably 50 μm~3000 μm.
The active material layer 5 of second pole piece 2 may also set up groove G, may also set up guarantor's liquid with pore structure in groove G
Layer 6.
In the cyclic process of secondary cell, the lithium ion of the first pole piece 1 needs to be embedded into the active material of the second pole piece 2
In layer 5.Since active material layer 5 of second pole piece 2 at groove G has lesser thickness, if the second pole piece 2
Groove G is opposite with the region with normal thickness of active material layer 5 of the first pole piece 1, then will lead to the lithium of the first pole piece 1
Ion can not be completely embedded into the active material layer 5 of the second pole piece 2, to cause analysis lithium, influence the dynamics of secondary cell
Performance.And active material layer 5 of first pole piece 1 at groove G also has lesser thickness, it is therefore preferred that the first pole piece 1
Groove G it is opposite with the groove G of the second pole piece 2, in this way can to avoid analysis lithium.
The other embodiments of the pole piece of the application are illustrated below.To simplify the description, it is only mainly introduced below
The difference of its embodiment and first embodiment, the part not described are referred to first embodiment and are understood.
Referring to Fig. 5, in a second embodiment, groove G is only set on the active material layer 5 of 4 side of collector and protects liquid
Layer 6.Under the premise of meeting stress release and electrolyte wellability, it can avoid the excessive active material layer 5 of removal in this way, improve
The energy density of secondary cell.
Referring to figure 6 and figure 7, in the third embodiment, guarantor's liquid layer 6 covers the table of the separate collector 4 of active material layer 5
Face.The continuous coating of guarantor's liquid layer 6 may be implemented in this way, simplify coating process.
Referring to Fig. 8, in the fourth embodiment, groove G is bar shaped and extends along the length direction X of the first pole piece 1.It is preferred that
Ground, groove G are multiple and width direction Y arranged for interval along pole piece.Since the length of the first pole piece 1 X along its length is general
Much larger than the width of the first pole piece 1 X in the width direction, therefore, compared with first embodiment, fourth embodiment can reduce groove
The quantity of G simplifies the coating process of active material layer 5 and guarantor's liquid layer 6.
On the width direction Y of the first pole piece 1, the overall width of the multiple groove G is not more than the overall width of the first pole piece 1
Half.The width of each groove G can be 0.1 μm~10mm, preferably 50 μm~3000 μm.
Alternatively, of course, groove G can also extend along relative to the inclined direction width direction Y and length direction X.
Referring to Fig. 8, in the 5th embodiment, groove G can be hole shape.For example, groove G can for circle, rectangle, diamond shape or its
Its shape.
Claims (10)
1. a kind of pole piece, which is characterized in that including collector (4), active material layer (5) and guarantor's liquid layer (6)；
Active material layer (5) is set to the surface of collector (4), and active material layer (5) is equipped with groove (G)；
Guarantor's liquid layer (6) has pore structure, and guarantor's liquid layer (6) is at least partially disposed in groove (G).
2. pole piece according to claim 1, which is characterized in that be full of guarantor's liquid layer (6) in groove (G).
3. pole piece according to claim 1 or 2, which is characterized in that guarantor's liquid layer (6) covers the separate of active material layer (5)
The surface of collector (4).
4. pole piece according to claim 1, which is characterized in that on the thickness direction (Z) of pole piece, the depth of groove (G)
No more than 2/3rds of the thickness of active material layer (5).
5. pole piece according to claim 1, which is characterized in that groove (G) is bar shaped and prolongs along the width direction of pole piece (Y)
It stretches.
6. pole piece according to claim 5, which is characterized in that
Groove (G) is multiple and length direction (X) arranged for interval along pole piece；
On the length direction (X) of pole piece, the overall width of the multiple groove (G) is not more than the half of pole piece total length.
7. pole piece according to claim 5, which is characterized in that groove (G) extends along the end of the width direction (Y) of pole piece
To the edge of active material layer (5).
8. a kind of electrode assembly, including the first pole piece (1), the second pole piece (2) and diaphragm (3), diaphragm (3) is by the first pole piece (1)
It is separated with the second pole piece (2)；
It is characterized in that,
At least one in first pole piece (1) and the second pole piece (2) is pole piece of any of claims 1-7.
9. electrode assembly according to claim 8, which is characterized in that
First pole piece (1) and the second pole piece (2) are pole piece of any of claims 1-7；
The groove (G) of first pole piece (1) and the groove (G) of the second pole piece (2) are opposite.
10. a kind of secondary cell, which is characterized in that including electrode assembly described in claim 8 or 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822168388.2U CN209183641U (en) | 2018-12-22 | 2018-12-22 | Pole piece, electrode assembly and secondary cell |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822168388.2U CN209183641U (en) | 2018-12-22 | 2018-12-22 | Pole piece, electrode assembly and secondary cell |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209183641U true CN209183641U (en) | 2019-07-30 |
Family
ID=67377619
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201822168388.2U Active CN209183641U (en) | 2018-12-22 | 2018-12-22 | Pole piece, electrode assembly and secondary cell |
Country Status (1)
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| CN (1) | CN209183641U (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111540910A (en) * | 2020-05-22 | 2020-08-14 | 江苏塔菲尔新能源科技股份有限公司 | Pole piece, battery core and battery |
| CN112542617A (en) * | 2020-12-04 | 2021-03-23 | 东莞新能安科技有限公司 | Electrochemical device and electronic device |
| CN113871790A (en) * | 2020-06-30 | 2021-12-31 | 比亚迪股份有限公司 | Lithium ion battery pole piece and lithium ion battery |
| CN114094037A (en) * | 2021-10-18 | 2022-02-25 | 深圳市首通新能源科技有限公司 | Pole piece, electric core and cylindrical battery |
| CN114203962A (en) * | 2021-12-13 | 2022-03-18 | 珠海冠宇动力电池有限公司 | Pole piece, battery core and battery |
| CN116364847A (en) * | 2023-05-30 | 2023-06-30 | 惠州亿纬动力电池有限公司 | Manufacturing method of battery pole piece, battery pole piece and battery |
| WO2023185252A1 (en) * | 2022-03-30 | 2023-10-05 | 宁德时代新能源科技股份有限公司 | Electrode plate, electrode assembly, battery cell, battery and electric device |
| CN117219894A (en) * | 2023-11-08 | 2023-12-12 | 江苏正力新能电池技术有限公司 | Pole piece, battery and electric equipment |
-
2018
- 2018-12-22 CN CN201822168388.2U patent/CN209183641U/en active Active
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111540910A (en) * | 2020-05-22 | 2020-08-14 | 江苏塔菲尔新能源科技股份有限公司 | Pole piece, battery core and battery |
| CN113871790A (en) * | 2020-06-30 | 2021-12-31 | 比亚迪股份有限公司 | Lithium ion battery pole piece and lithium ion battery |
| CN112542617A (en) * | 2020-12-04 | 2021-03-23 | 东莞新能安科技有限公司 | Electrochemical device and electronic device |
| CN112542617B (en) * | 2020-12-04 | 2022-08-09 | 东莞新能安科技有限公司 | Electrochemical device and electronic device |
| CN114094037A (en) * | 2021-10-18 | 2022-02-25 | 深圳市首通新能源科技有限公司 | Pole piece, electric core and cylindrical battery |
| CN114203962A (en) * | 2021-12-13 | 2022-03-18 | 珠海冠宇动力电池有限公司 | Pole piece, battery core and battery |
| WO2023185252A1 (en) * | 2022-03-30 | 2023-10-05 | 宁德时代新能源科技股份有限公司 | Electrode plate, electrode assembly, battery cell, battery and electric device |
| CN116364847A (en) * | 2023-05-30 | 2023-06-30 | 惠州亿纬动力电池有限公司 | Manufacturing method of battery pole piece, battery pole piece and battery |
| CN116364847B (en) * | 2023-05-30 | 2024-03-15 | 惠州亿纬动力电池有限公司 | Manufacturing method of battery pole piece, battery pole piece and battery |
| CN117219894A (en) * | 2023-11-08 | 2023-12-12 | 江苏正力新能电池技术有限公司 | Pole piece, battery and electric equipment |
| CN117219894B (en) * | 2023-11-08 | 2024-03-22 | 江苏正力新能电池技术有限公司 | Pole piece, battery and electric equipment |
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