CN111668431A - Diaphragm for winding battery, winding battery and preparation method of winding battery - Google Patents
Diaphragm for winding battery, winding battery and preparation method of winding battery Download PDFInfo
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- CN111668431A CN111668431A CN202010442286.4A CN202010442286A CN111668431A CN 111668431 A CN111668431 A CN 111668431A CN 202010442286 A CN202010442286 A CN 202010442286A CN 111668431 A CN111668431 A CN 111668431A
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- coating
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- base film
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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
- H01M10/058—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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- 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
Abstract
The present invention provides a separator for a wound battery, comprising: a base film; a first coating layer coated on at least one side of the base film; an adhesive coating layer coated on at least one side of an extended region of one end portion of the base film; and is disposed at a winding tail portion of the wound battery. Compared with the prior art, the diaphragm adopted by the invention has viscosity under the high-temperature condition by utilizing the adhesive coating, is in contact with the empty foil at the ending part, can be fixed at the outermost ring of the winding core to play a role of fixing the winding core, so that the use of the traditional ending stop adhesive is cancelled, and the problems of increasing the thickness of a battery cell and reducing the energy density of the battery in the existing mode of pasting the ending stop adhesive on the aluminum foil of the winding battery are solved; and simultaneously reduces the proportion of poor appearance caused by the wrinkling of the stop gum. In addition, the invention also provides a winding battery and a preparation method thereof.
Description
Technical Field
The invention relates to the field of lithium batteries, in particular to a diaphragm for a wound battery, the wound battery and a preparation method thereof.
Background
As the development of the wound battery is matured, the market occupation ratio of the wound battery is increased. The current winding battery mainly adopts a winding mode that a diaphragm wraps a negative electrode and a negative electrode wraps a positive electrode, and after winding is finished, two ending modes are mainly adopted:
1) one is to prolong the coating of the diaphragm, and the coating areas of the positive and negative pole pieces are terminated, and then a stop adhesive is stuck to the tail part of the outer diaphragm to play a role in fixing the winding core and prevent the winding core from scattering in the turnover process; however, in the ending mode, after the steel needle penetrates into the fully charged battery, the positive and negative pole pieces with the dressing are short-circuited instantaneously, a large amount of heat is released immediately, and the fire is easy to ignite and burn.
2) In order to improve the nail penetration performance of the battery adopting the ending mode, another ending mode is provided in the prior art, namely, a section of lengthened hollow aluminum foil is arranged at the tail part of the positive plate, a section of lengthened hollow copper foil is arranged at the tail part of the negative plate, the diaphragm is lengthened, the hollow aluminum foil, the diaphragm and the hollow aluminum foil, the diaphragm, the hollow copper foil and the diaphragm are arranged from outside to inside in sequence and surround the outer circle of the battery cell for a circle, then a piece of ending glue is pasted at the ending position of the aluminum foil to play a role in fixing the coiled core ending aluminum foil. Although the nail penetrating performance of the battery is improved and the safety of the battery is improved by the ending mode, the ending hollow aluminum/copper foil does not contain active substances, and not only the outer layer surrounds the hollow copper foil layer, the hollow aluminum foil layer and the diaphragm layer, but also the stop glue layer is added, so that the diameter of the winding core is greatly increased, and the overall energy density of the battery core is reduced.
In summary, both ending manners adopt a method of attaching a terminating adhesive 2' to the tail portion to fix the winding core, as shown in fig. 1; in the former method, the dressing areas of the positive and negative pole pieces are closed, so the energy density of the dressing is not greatly influenced by the stop adhesive 2'; however, the latter is a mode of ending by using the empty foil 1 'at the ending part, and since the thickness of the empty foil part is originally increased and the thickness of the ending glue 2' part is increased, the overall energy density of the battery cell is greatly influenced; in addition, the stop glue 2' is easy to wrinkle when being pasted, which not only affects the appearance of the battery, but also increases the repair rate of the battery.
Chinese utility model patent (CN207834477U) discloses a lithium ion battery cell and lithium ion battery, including the electric core body that positive plate, negative plate and diaphragm plate assembled, the tail end of diaphragm plate passes through the fixed bonding of binder on electric core body. The scheme mainly aims at the laminated battery, the traditional stop rubber is replaced by the adhesive, but the problem of thickness increase of the wound battery in the ending mode of the adhesive is solved, the appearance of the wound battery is improved, but the effect of reducing energy density is not achieved, and the problem of poor adhesion is possibly caused.
In view of the above, it is necessary to provide a technical solution to the above problems.
Disclosure of Invention
One of the objects of the present invention is: by providing the diaphragm for the winding battery, the problems that the thickness of a battery cell is increased, the energy density of the battery is reduced and the appearance of the battery is influenced in the conventional way of sticking the stop glue to the aluminum foil end of the winding battery are solved; by adopting the diaphragm provided by the invention, a mode of attaching the stop rubber at the end is cancelled, the energy density of the battery cell is improved, and the proportion of poor appearance caused by wrinkling of the stop rubber is reduced.
In order to achieve the purpose, the invention adopts the following technical scheme:
a separator for a wound battery, comprising:
a base film;
a first coating layer coated on at least one side of the base film;
an adhesive coating layer coated on at least one side of an extended region of one end portion of the base film; and is disposed at a winding tail portion of the wound battery.
According to the diaphragm adopted by the invention, the adhesive coating is arranged on at least one surface of the extending area at one end part of the base film, and is arranged at the tail part of the winding. This adhesive coating is because of direct coating on the base film, with first coating side by side the coating on the base film, it has replaced the first coating of original coating at the base film tip promptly to be adhesive coating, so this adhesive coating does not increase the whole thickness of book core, fix empty paper tinsel again in the outer lane of rolling up the core through its viscidity and empty paper tinsel contact, the use that traditional ending was glued has been cancelled, and then solved present coiling battery aluminium foil ending and pasted the gluey mode and have increased electric core thickness, reduce the problem of battery energy density, adhesive coating sets up on the diaphragm simultaneously, greatly reduced because of the bad proportion of outward appearance that the termination is wrinkled and is leaded to yet.
Preferably, the bond coat has a thickness less than the thickness of the first coating. Generally, when the bonding coating is converted into a viscous state, the volume of the bonding coating is increased, and when the bonding coating is subsequently bonded with the hollow foil by hot pressing, the bonding coating with slightly smaller thickness can also have better bonding effect; on the other hand, convex bulges are not formed due to excessively thick coating thickness, and the overall thickness of the battery is increased; the setting of low thickness can also play a cushioning effect when the rolling is accomplished in diaphragm preparation, is unlikely to because of the local arch that the diaphragm thickness is inhomogeneous everywhere leads to, and rolling tension is inhomogeneous. The bonding coating can be prepared from materials such as PP, PVDF and the like, but the bonding coating is ensured to be sticky at a high temperature, and can be bonded with the hollow foil by adopting a hot pressing technology, so that the hollow foil is ensured to be fixed on the outermost circle of the winding core, and the effect of preventing winding and scattering is achieved. Wherein the high temperature state is 90-110 ℃, and the empty foil can be an aluminum foil sheet adopted by a conventional positive plate.
Preferably, the length of the extending region of one end of the base film is 2 to 20 mm.
Preferably, the bond coat is a colored bond coat. The colored adhesive coating is beneficial to the recognition of the adhesive coating area by a winding machine, the adhesive coating is prevented from being wound as a winding head, and the adhesive coating is ensured to be arranged at the winding tail of the winding battery.
Preferably, the separator further includes a color code coating layer coated on at least one side of the extended region of the other end portion of the base film and disposed at a winding head portion of the wound battery.
Preferably, the color patch coating has a thickness less than the thickness of the first coating. The patch coating thickness settings can be seen above for bond coating thickness settings.
Preferably, the length of the extending region at the other end of the base film is 2 to 20 mm.
Preferably, the first coating is a PVDF coating and/or a ceramic coating.
Another object of the present invention is to provide a wound battery including an electrode sheet and a separator, wherein the separator is the separator described above.
The invention also aims to provide a preparation method of the winding battery, which comprises the following steps:
coating a first coating on at least one side of a base film, and coating a bonding coating on an extending area of one end part of the base film to finish the preparation of the diaphragm;
arranging a high-temperature hot-pressing module at a diaphragm cutting position of a winding machine, wherein the high-temperature hot-pressing module is used for activating the viscosity of the bonding coating;
placing the electrode plate and the diaphragm in the winding machine for winding;
after winding and ending, the winding core passes through a cold pressing short circuit test procedure, the bonding coating at the winding tail part of the winding core fixes the empty foil at the ending part on the outermost circle of the winding core, and the preparation of the winding battery is completed.
Preferably, the preparation method further comprises coating a color code coating on an extension area of the other end part of the base film; and a diaphragm color code induction module which is arranged close to the high-temperature hot-pressing module is arranged in the winding machine and used for cutting the color code coating. Because the color of the bonding coat is similar to that of the first coat which is coated conventionally, the diaphragm color scale sensing module is arranged in the winding machine, so that the winding equipment can be helped to identify the bonding coat according to different colors, when the color scale coat which is wound next time is detected, the tail end of the winding is indicated, and the bonding coat is prevented from being used as the head of the winding to be wound by the winding machine during winding. Of course, if the adhesive coating has a clearly distinguishable color, the arrangement of the diaphragm color scale sensing module can be eliminated, and the winding machine can identify where the tail part of the winding is located according to the color, so that the adhesive coating is located at the tail part of the winding.
The invention has the beneficial effects that:
1) the present invention provides a separator for a wound battery, comprising: a base film; a first coating layer coated on at least one side of the base film; an adhesive coating layer coated on at least one side of an extended region of one end portion of the base film; and is disposed at a winding tail portion of the wound battery. Compared with the prior art, the diaphragm adopted by the invention is provided with the adhesive coating on at least one surface of the extending area at one end part of the base film, the adhesive coating is arranged at the winding tail part, after the winding is finished, the adhesive coating has viscosity under the high-temperature condition, is in contact with the empty foil at the ending part, can be fixed at the outermost ring of the winding core, prevents the winding core from scattering in the circulation process, plays a role in fixing the winding core, cancels the use of the traditional ending and stopping adhesive, and further solves the problems of increasing the thickness of the battery core and reducing the energy density of the battery in the existing mode of pasting the ending and stopping adhesive on the aluminum foil of the winding battery; and meanwhile, the adhesive coating is arranged on the diaphragm, so that the proportion of poor appearance caused by wrinkling of the stop glue is greatly reduced.
2) Compared with the existing method, the preparation method of the winding battery is combined with the arrangement of the novel diaphragm, the bonding coating replaces the coating (namely the first coating) at the end part of the original diaphragm, and then the high-temperature hot-pressing technology is utilized to tightly bond the empty foil at the ending part and the bonding coating together, so that the effect of fixing the winding core is achieved, and the arrangement of the traditional stop adhesive is cancelled; the high-temperature hot-pressure bonding of the two is equivalent to increasing the thickness of the hollow foil, so that the impact resistance of the hollow foil is enhanced, and the stability of the battery can be better protected in a nail penetration performance test; therefore, the outer ring of the winding core only needs to adopt one circle of empty foil ending, and the winding ending of a plurality of circles of empty foils is not needed to be increased due to the low melting point of the empty foils.
3) The preparation cost is low, the arrangement of the ending stop glue is cancelled, and the manufacturing cost of the battery cell is reduced; the structure of the high-temperature hot-pressing module added in the winding machine is simple, the winding machine is slightly improved, and the high-temperature hot-pressing module is easily integrated into the current battery production line.
Drawings
Fig. 1 is a conventional wound end-of-run configuration.
Fig. 2 is a schematic structural view of the separator of the present invention.
Fig. 3 is a view showing the structure of the end of winding of the present invention.
In the figure: 1' -empty foil at the end; 2' -stop gum; 1-empty foil at the end; 2-a separator; 21-a base film; 22-a first coating; 23-a bond coat; 24-color scale coating.
Detailed Description
In order to make the technical solutions and advantages of the present invention clearer, the present invention and its advantages will be described in further detail below with reference to the following detailed description and the accompanying drawings, but the embodiments of the present invention are not limited thereto.
Example 1
As shown in fig. 2, a separator for a wound battery includes:
a base film 21;
a first coating layer 22 coated on at least one side of the base film 21;
and an adhesive coating layer 23 coated on at least one surface of an extended region of at least one end portion of the base film 21 and disposed at a winding tail portion of the wound battery.
Wherein the length of an extended region of one end portion of the base film 21 is 5mm, the length of the adhesive coating layer 23 may be set to be less than or equal to 5 mm. And the first coating 22 is a PVDF coating and/or a ceramic coating. Specifically, the separator 2 may be provided in a three-layer coating structure in which one side of the base film 21 is coated with a PVDF coating layer, the other side is coated with a ceramic coating layer, and both sides of an extended region of one end portion of the base film 21 are coated with the adhesive coating layer 23; the separator 2 may be provided in a two-layer structure in which a PVDF coating layer is applied to only one side of the base film 21 and a bond coating layer 23 is applied to one side of an end extension region of the base film 21, the bond coating layer 23 being located on the same side of the base film 21 as the PVDF coating layer; other coating configurations of the separator 2 may be selected.
Further, the thickness of the bond coat layer 23 is less than the thickness of the first coat layer 22. The adhesive coating 23 can be made of PP, PVDF, etc., but it should be ensured that it is adhesive at high temperature, and it can be adhered to the empty foil by hot pressing, so as to ensure that the empty foil is fixed on the outermost circle of the winding core, thereby preventing the winding from loosing. Wherein the high temperature state is 90-110 ℃, and the empty foil can be an aluminum foil sheet adopted by a conventional positive plate.
Further, the bond coat 23 is a colored bond coat. The colored bond coat 23 is adopted to facilitate the recognition of the bond coat area by a winding machine, prevent the bond coat 23 from being wound as the winding head and ensure that the bond coat 23 is arranged at the winding tail of the wound battery.
Further, the separator 2 further includes a color code coating layer 24 coated on at least one side of the extended region of the other end portion of the base film 21 and disposed at the winding head portion of the wound battery. Wherein the length of the extending region of the other end portion of the base film 21 is 5mm, and the length of the color patch coating 24 may be set to be less than or equal to 5 mm; preferably, the color patch coating 24 has a thickness less than the thickness of the first coating 22. The color patch coating 24 thickness setting can be seen above in the bond coat 23 thickness setting.
Example 2
Unlike embodiment 1, the length of the extended region of one end portion of the base film 21 of this embodiment is 18mm, and the length of the adhesive coating layer 23 may be set to be 18mm or less; the length of the other end extension region of the base film 21 is 18mm, and the length of the patch coating 24 may be set to be less than or equal to 18 mm.
The rest is the same as embodiment 1, and the description is omitted here.
Example 3
Unlike embodiment 1, the length of the extended region of one end portion of the base film 21 of this embodiment is 2mm, and the length of the adhesive coating layer 23 may be set to be less than or equal to 2 mm; the length of the other end extension region of the base film 21 is 2mm, and the length of the patch coating 24 may be set to be less than or equal to 2 mm.
The rest is the same as embodiment 1, and the description is omitted here.
Example 4
As shown in fig. 3, a wound battery includes an electrode sheet and a separator 2, and the separator 2 is the separator 2 described above.
Example 5
As shown in fig. 3, a method for manufacturing a wound battery includes the steps of:
coating a first coating layer 22 on at least one side of a base film 21 and a bonding coating layer 23 on an extending region of one end portion of the base film 21 to complete the preparation of the separator;
arranging a high-temperature hot-pressing module at the diaphragm cutting position of the winding machine, wherein the high-temperature hot-pressing module is used for activating the viscosity of the adhesive coating 23;
placing the electrode plate and the diaphragm 2 in a winding machine for winding;
after winding and ending, the winding core passes through a cold pressing short circuit test procedure, and the adhesive coating 23 at the winding tail part of the winding core fixes the empty foil at the ending part on the outermost circle of the winding core, so that the preparation of the winding battery is completed.
Further, the present production method further includes applying the color patch coating 24 to an extended region of the other end portion of the base film 21; and a diaphragm color code sensing module arranged close to the high-temperature hot-pressing module is arranged in the winding machine and used for cutting the color code coating 24.
Specifically, the preparation method of the winding battery comprises the following steps:
s1, designing the type of the battery, and preparing electrode plates which are normally subjected to material mixing, coating, rolling, slitting and sheet making, and tabs to be welded;
s2, coating the diaphragm by adopting three materials in a clearance way, coating a PVDF coating on one surface of the base film 21, and coating a ceramic coating on the other surface of the base film 21, namely coating the first coating 22 on the base film 21; then, determining the size of the diaphragm according to the length of a pole piece of the battery model, coating a bonding coating 23 on an extension area at one end of a base film 21, wherein the length of the extension area is 2-20 mm, namely coating the bonding coating 23 on the tail part of the wound diaphragm 2, and the coating thickness of the bonding coating 23 is smaller than that of a first coating 22; coating a color code coating 24 on an extension area of the other end of the base film 21, wherein the extension area is 2-20 mm, namely coating the color code coating 24 on the winding head of the diaphragm 2, and the coating thickness of the color code coating 24 is smaller than that of the first coating 22, so that the preparation of the diaphragm 2 is completed;
s3, pairing the electrode sheets in the step S1, placing the electrode sheets and the diaphragm 2 in the step S2 in a winding machine for winding, arranging a high-temperature hot-pressing module and a diaphragm color mark induction module at the diaphragm cutting position of the winding machine, inducing the color mark coating 24 by the diaphragm color mark induction module, indicating that the winding is close to the tail part when the next wound color mark coating 24 is induced, cutting the diaphragm at the induction position of the color mark coating 24, and cutting off the color mark coating 24; then, activating the viscosity of the adhesive coating 23 at the tail part of the diaphragm by using a high-temperature hot-pressing module, wherein the activation temperature can be set to be 100 ℃, and the hot-pressing time is 1 s; when the adhesive coating 23 is colored, the color code coating 24 can be omitted, whether the winding tail is reached or not is judged by sensing the difference of colors, if the adhesive coating 23 is sensed, the diaphragm 2 can be cut at the tail of the adhesive coating 23, and then the viscosity of the adhesive coating 23 is activated;
s4, after winding and ending, the winding core passes through a cold pressing short circuit test procedure, and the adhesive coating 23 at the winding tail of the winding core fixes the empty foil at the ending part on the outermost ring of the winding core, so that the winding core is prevented from scattering, and the preparation of the winding core is completed;
and S5, placing the prepared winding core into a shell, and carrying out processes such as packaging, liquid injection, formation and the like to finish the preparation of the winding battery.
Variations and modifications to the above-described embodiments may also occur to those skilled in the art, which fall within the scope of the invention as disclosed and taught herein. Therefore, the present invention is not limited to the above-mentioned embodiments, and any obvious improvement, replacement or modification made by those skilled in the art based on the present invention is within the protection scope of the present invention. Furthermore, although specific terms are employed herein, they are used in a generic and descriptive sense only and not for purposes of limitation.
Claims (10)
1. A separator for a wound battery, comprising:
a base film (21);
a first coating layer (22) applied to at least one side of the base film (21);
a bonding coat (23) coated on at least one side of an end extension region of the base film (21); and is disposed at a winding tail portion of the wound battery.
2. The separator for a wound battery according to claim 1, wherein the thickness of the adhesive coating layer (23) is smaller than the thickness of the first coating layer (22).
3. The separator for a wound battery according to claim 1, wherein the length of an extended region of one end portion of the base film (21) is 2 to 20 mm.
4. The separator for a wound battery according to claim 1, wherein the bond coat (23) is a colored bond coat.
5. The separator for a wound battery according to claim 1, further comprising a color code coating layer (24) applied to at least one surface of an extended region of the other end portion of the base film (21) and provided at a winding head portion of the wound battery.
6. Separator for wound batteries according to claim 5, characterized in that the thickness of the color scale coating (24) is smaller than the thickness of the first coating (22).
7. The separator for a wound battery according to claim 5, wherein the length of the extended region of the other end portion of the base film (21) is 2 to 20 mm.
8. A wound battery, comprising an electrode sheet and a separator (2), wherein the separator (2) is the separator (2) according to any one of claims 1 to 7.
9. A method for preparing a wound battery is characterized by comprising the following steps:
coating a first coating (22) on at least one side of a base film (21), and coating a bonding coating (23) on an extending area of one end part of the base film (21) to finish the preparation of the diaphragm;
arranging a high-temperature hot-pressing module at a diaphragm cutting position of a winding machine, wherein the high-temperature hot-pressing module is used for activating the viscosity of the bonding coating (23);
placing the electrode plate and the diaphragm (2) in the winding machine for winding;
after winding and ending, the winding core passes through a cold pressing short circuit test procedure, the bonding coating (23) at the winding tail part of the winding core fixes the empty foil (1) at the ending part on the outermost ring of the winding core, and the preparation of the winding battery is completed.
10. The method of manufacturing a wound battery according to claim 9, further comprising applying a color patch coating (24) to an extended region of the other end portion of the base film (21); and a diaphragm color code induction module which is arranged close to the high-temperature hot-pressing module is arranged in the winding machine and is used for cutting the color code coating (24).
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010442286.4A CN111668431A (en) | 2020-05-22 | 2020-05-22 | Diaphragm for winding battery, winding battery and preparation method of winding battery |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010442286.4A CN111668431A (en) | 2020-05-22 | 2020-05-22 | Diaphragm for winding battery, winding battery and preparation method of winding battery |
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| CN111668431A true CN111668431A (en) | 2020-09-15 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112259806A (en) * | 2020-10-30 | 2021-01-22 | 东莞市创明电池技术有限公司 | Manufacturing method of winding type battery and winding type battery semi-finished product structure |
| WO2022061562A1 (en) * | 2020-09-23 | 2022-03-31 | 宁德新能源科技有限公司 | Electrochemical device and electronic device |
| CN114447442A (en) * | 2022-02-07 | 2022-05-06 | 珠海冠宇电池股份有限公司 | Battery core and battery |
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|---|---|---|---|---|
| WO2022061562A1 (en) * | 2020-09-23 | 2022-03-31 | 宁德新能源科技有限公司 | Electrochemical device and electronic device |
| CN112259806A (en) * | 2020-10-30 | 2021-01-22 | 东莞市创明电池技术有限公司 | Manufacturing method of winding type battery and winding type battery semi-finished product structure |
| CN114447442A (en) * | 2022-02-07 | 2022-05-06 | 珠海冠宇电池股份有限公司 | Battery core and battery |
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