CN116826142A - Rolling core, preparation method thereof and cylindrical battery - Google Patents
Rolling core, preparation method thereof and cylindrical battery Download PDFInfo
- Publication number
- CN116826142A CN116826142A CN202310980328.3A CN202310980328A CN116826142A CN 116826142 A CN116826142 A CN 116826142A CN 202310980328 A CN202310980328 A CN 202310980328A CN 116826142 A CN116826142 A CN 116826142A
- Authority
- CN
- China
- Prior art keywords
- winding core
- winding
- pole piece
- diaphragm
- positive
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000002360 preparation method Methods 0.000 title abstract description 8
- 238000005096 rolling process Methods 0.000 title description 2
- 238000004804 winding Methods 0.000 claims abstract description 99
- 239000011149 active material Substances 0.000 claims abstract description 18
- 239000000463 material Substances 0.000 claims abstract description 9
- 239000006258 conductive agent Substances 0.000 claims abstract description 5
- 239000011230 binding agent Substances 0.000 claims abstract description 4
- 238000000034 method Methods 0.000 claims description 15
- 239000002131 composite material Substances 0.000 claims description 6
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical group [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 4
- 239000002033 PVDF binder Substances 0.000 claims description 4
- 239000010439 graphite Substances 0.000 claims description 4
- 229910002804 graphite Inorganic materials 0.000 claims description 4
- GELKBWJHTRAYNV-UHFFFAOYSA-K lithium iron phosphate Chemical compound [Li+].[Fe+2].[O-]P([O-])([O-])=O GELKBWJHTRAYNV-UHFFFAOYSA-K 0.000 claims description 4
- 239000007773 negative electrode material Substances 0.000 claims description 4
- 229920002981 polyvinylidene fluoride Polymers 0.000 claims description 4
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 claims description 3
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 3
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims description 3
- KFDQGLPGKXUTMZ-UHFFFAOYSA-N [Mn].[Co].[Ni] Chemical group [Mn].[Co].[Ni] KFDQGLPGKXUTMZ-UHFFFAOYSA-N 0.000 claims description 3
- 239000000919 ceramic Substances 0.000 claims description 3
- 229910021385 hard carbon Inorganic materials 0.000 claims description 3
- 229910052744 lithium Inorganic materials 0.000 claims description 3
- 229910000625 lithium cobalt oxide Inorganic materials 0.000 claims description 3
- BFZPBUKRYWOWDV-UHFFFAOYSA-N lithium;oxido(oxo)cobalt Chemical compound [Li+].[O-][Co]=O BFZPBUKRYWOWDV-UHFFFAOYSA-N 0.000 claims description 3
- 229910052710 silicon Inorganic materials 0.000 claims description 3
- 239000010703 silicon Substances 0.000 claims description 3
- 229910021384 soft carbon Inorganic materials 0.000 claims description 3
- 230000005251 gamma ray Effects 0.000 abstract 1
- 230000000052 comparative effect Effects 0.000 description 12
- 239000012528 membrane Substances 0.000 description 5
- 239000011883 electrode binding agent Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 239000013543 active substance Substances 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 230000002238 attenuated effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000006229 carbon black Substances 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 239000007774 positive electrode material Substances 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
Classifications
-
- 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
- H01M10/04—Construction or manufacture in general
- H01M10/0404—Machines for assembling 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
- H01M10/04—Construction or manufacture in general
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Secondary Cells (AREA)
Abstract
The application relates to the technical field of batteries, and discloses a winding core, a preparation method thereof and a cylindrical battery. The winding core comprises n (n is more than or equal to 2) winding core units which are sequentially sleeved from inside to outside, and each winding core unit is composed of a first diaphragm, a negative electrode plate, a second diaphragm and a positive electrode plate which are sequentially wound. The formula of the pole piece is as follows: 100% = α n ％+β n ％+γ n ％，α n % is the active material ratio in the pole piece, beta n % is the ratio of the conductive agent in the pole piece, gamma n % is the binder ratio in the pole piece, beta n ＝a×n b The value of a is 1-5, and b is-0.393; gamma ray n ＝c×n d D is-0.409, a and c satisfy c=2.99×a 0.4313 . The preparation method comprises winding a first winding core unit, ending and winding a second winding core unit, and circulating. A cylindrical battery comprising the above winding core. The winding core provided by the application can improve the phenomena of pole piece breakage and material dropping, and has good electrochemical performance.
Description
Technical Field
The application relates to the technical field of batteries, in particular to a winding core, a preparation method thereof and a cylindrical battery.
Background
As is well known, the curvature of the electrode is reduced along with the increase of the winding number of the cylindrical battery core in the winding process, in the prior art, positive and negative electrode plates with the same design are wound around a winding needle according to the designed thickness to form the winding core, so that the electrode plates of the inner ring have larger mechanical stress than the electrode plates with larger curvature, the stress of the electrode plates of the inner ring is continuously changed along with the expansion and shrinkage of the electrode plates in the charging and discharging process, and the expansion of the electrode plates is continuously increased in the circulating process of the electrode plates, so that the stress of the electrode plates is also continuously increased, especially the electrode plates of the inner ring, and the electrode plates of the inner ring are broken or dropped due to the increase of the stress, so that the performance of the battery is greatly attenuated.
In view of this, the present application has been made.
Disclosure of Invention
The present application aims to provide a winding core, a preparation method thereof and a cylindrical battery, and aims to solve at least one of the problems mentioned in the background art.
The application is realized in the following way:
in a first aspect, the application provides a winding core, which comprises n (n is more than or equal to 2) winding core units sleeved in sequence from inside to outside, wherein each winding core unit comprises a pole piece and a diaphragm, the pole piece comprises a positive pole piece and a negative pole piece, the diaphragm comprises a first diaphragm and a second diaphragm, and each winding core unit consists of the first diaphragm, the negative pole piece, the second diaphragm and the positive pole piece which are wound in sequence;
the formula of the pole piece is as follows:
Σ n ＝α n ％+β n ％+γ n ％，α n % is the active material ratio in the pole piece, beta n % is the ratio of the conductive agent in the pole piece, gamma n % is the binder ratio in the pole piece, Σn=100%, and satisfies the following relationship:
β n ＝a×n b wherein a and b are constants, the value of a is 1-5, and b is-0.393;
γ n ＝c×n d where c and d are constants, d is-0.409, and a and c satisfy c=2.99×a 0.4313 ；
The positive electrode sheet surface density sigma satisfies the formula: sigma (sigma) n =11.3×ln (n) +k, where k has a value of 15 to 25 and σ is mg/cm 2 ；
The negative electrode sheet surface density ω satisfies the formula: c (C) Negative pole ×ω n ×α n is positive ％＝λ×C Positive direction ×σ n ×α n is negative Units of%and omega are mg/cm 2 Wherein lambda is a constant of 1.05 to 1.25, C Positive direction The positive electrode gram capacity is mAh/g; c (C) Negative pole The unit is mAh/g; alpha n is positive % is the active material ratio in the positive plate; alpha n is negative % is the active material ratio in the negative plate.
In an alternative embodiment, the active material in the positive plate is a nickel cobalt manganese ternary material, lithium iron phosphate or lithium cobalt oxide.
In an alternative embodiment, the active material in the negative electrode sheet is graphite, hard carbon, soft carbon, a silicon negative electrode material, or lithium titanate.
In alternative embodiments, the separator is PP, PE or a composite membrane of PP and PE, or a composite membrane of PP, PE, PP and PE coated with ceramic or PVDF.
In an alternative embodiment, the thickness D of each of the core units n Delta multiplied by n+mu, where delta and mu are constants, delta=2 to 6, mu=10 to 20, d n Is in mm;
in a second aspect, the present application provides a method for preparing a winding core according to any of the preceding embodiments, comprising:
sequentially arranging a first diaphragm, a negative electrode plate, a second diaphragm and a positive electrode plate on a winding needle for winding, and ending after winding is finished to obtain a first winding core unit;
sequentially arranging a first diaphragm, a negative electrode plate, a second diaphragm and a positive electrode plate on a first winding core unit for winding, and ending after winding to obtain a second winding core unit;
when n=2, obtaining the second winding core unit to obtain a winding core; when n > 2, winding of at least one core unit on the basis of said second core unit is continued in accordance with the method of obtaining said second core unit.
In a third aspect, the present application provides a cylindrical battery comprising a jellyroll as in any of the previous embodiments.
The application has the following beneficial effects:
1. the phenomena of pole piece breakage and material dropping caused by large stress of the inner ring of the winding core can be greatly improved;
2. the energy density of the battery can be improved on the premise of ensuring the performance of the battery by adopting pole pieces with different designs for different winding core units;
3. the problem of electrode stress is improved, and the design of the thickness of the battery can be further increased in the direction of the thickness of the existing cylindrical battery, so that the energy density of the battery is increased.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic view of a winding core structure according to an embodiment of the present application.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application more clear, the technical solutions of the embodiments of the present application will be clearly and completely described below. The specific conditions are not noted in the examples and are carried out according to conventional conditions or conditions recommended by the manufacturer. The reagents or apparatus used were conventional products commercially available without the manufacturer's attention.
The features and capabilities of the present application are described in further detail below in connection with the examples.
As shown in fig. 1, the winding core provided by the embodiment of the application comprises n (n is more than or equal to 2) winding core units sleeved in sequence from inside to outside, wherein each winding core unit comprises a pole piece and a diaphragm, the pole piece comprises a positive pole piece and a negative pole piece, the diaphragm comprises a first diaphragm and a second diaphragm, and each winding core unit consists of the first diaphragm, the negative pole piece, the second diaphragm and the positive pole piece which are wound in sequence; the formula of the pole piece is as follows:
Σ n ＝α n ％+β n ％+γ n ％，α n % is the active material ratio in the pole piece, beta n % is the ratio of the conductive agent in the pole piece, gamma n % is the binder ratio in the pole piece, Σn=100%, and satisfies the following relationship:
β n ＝a×n b wherein a and b are constants, the value of a is 1-5, and b is-0.393;
γ n ＝c×n d where c and d are constants, d is-0.409, and a and c satisfy c=2.99×a 0.4313 ；
The positive electrode sheet surface density sigma satisfies the formula: sigma (sigma) n =11.3×ln (n) +k, where k has a value of 15 to 25 and σ is mg/cm 2 ；
The negative electrode sheet surface density ω satisfies the formula: c (C) Negative pole ×ω n ×α n is positive ％＝λ×C Positive direction ×σ n ×α n is negative Units of%and omega are mg/cm 2 Wherein lambda is a constant of 1.05 to 1.25, C Positive direction The positive electrode gram capacity is mAh/g; c (C) Negative pole The unit is mAh/g; alpha n is positive % is the active material ratio in the positive plate; alpha n is negative % is the active material ratio in the negative plate.
The winding core provided by the embodiment of the application is composed of a plurality of winding core units which are sleeved in sequence, and through the inventor's great creative labor discovery, when the design of the pole piece of the discontinuous winding core meets the requirements defined by the formulas, the phenomena of breakage and material dropping of the pole piece of the inner ring in the using process of the winding core can be well avoided, and the service life of the battery can be prolonged; and the duty ratio of active substances in the pole piece is improved along with the increase of the winding number, and the energy density of the battery can be improved on the premise that the multiplying power performance, the service life and other performances are not reduced.
Further, to ensure the overall performance of the battery, the thickness D of each winding core unit n Delta multiplied by n+mu, where delta and mu are constants, delta=2 to 6, mu=10 to 20, d n Is in mm;
further, the first diaphragm and the second diaphragm are the same specification, and the specifications of the diaphragms used by different winding core units are the same.
Optionally, the active material in the positive plate is nickel-cobalt-manganese ternary material, lithium iron phosphate or lithium cobalt oxide and other active materials which can be applied to the positive electrode of the battery.
Optionally, the active material in the negative electrode sheet is graphite, hard carbon, soft carbon, silicon negative electrode material or lithium titanate and other active materials which can be applied to the negative electrode of the battery.
Alternatively, the membrane is PP, PE or a composite membrane of PP and PE, or a composite membrane of PP, PE, PP and PE coated with ceramic or PVDF.
The first diaphragm and the second diaphragm in each winding core unit are the same in material and specification; the material of the diaphragm between the different winding core units can be different, the thickness can be different, but the width is consistent.
The preparation method of the winding core provided by the embodiment of the application is used for preparing the winding core provided by the embodiment of the application and comprises the following steps:
sequentially arranging a first diaphragm, a negative electrode plate, a second diaphragm and a positive electrode plate on a winding needle for winding, and attaching ending glue for ending after winding is finished to obtain a first winding core unit;
sequentially arranging a first diaphragm, a negative electrode plate, a second diaphragm and a positive electrode plate on a first winding core unit for winding, and attaching a tail-ending adhesive for ending after winding is finished to obtain a second winding core unit;
when n=2, obtaining the second winding core unit to obtain a winding core; when n > 2, winding of at least one core unit on the basis of said second core unit is continued in accordance with the method of obtaining said second core unit.
The number of windings of the core unit is determined by its thickness (i.e. thickness) during the preparation, i.e. the thickness D of each of said core units is given by the reference formula n Delta multiplied by n+mu, where delta and mu are constants, delta=2 to 6, mu=10 to 20, d n In mm.
The cylindrical battery provided by the embodiment of the application comprises the winding core provided by the embodiment of the application. Specifically, the winding core is disposed in a space surrounded by the housing and the cover plate.
The following examples and comparative examples are provided to illustrate the technical aspects provided by the present application.
In the following respective examples and comparative examples.
The positive electrode active material is lithium iron phosphate, the positive electrode conductive agent is carbon black, and the positive electrode binder is PVDF.
The negative electrode active material is graphite, the negative electrode binder is CMC and SBR, and the proportion of the CMC to the SBR is 2:3.
The gram capacity of the positive electrode plate is known to be 142mAh/g, and the gram capacity of the negative electrode plate is known to be 335mAh/g.
The parameter settings for each example are shown in tables 1-4:
table 1 parameter settings of example 1
Table 2 parameter settings of example 2
TABLE 3 parameter settings of example 3
Table 4 parameter settings of example 4
Table 5 parameter settings of example 5
Comparative example 1
The comparative example was identical to the positive, negative and separator sheets of the first core unit of example 3, and a core having substantially the same thickness as example 3 (rounded to a reserved integer of 60mm, note that it was impossible to achieve the exact identity due to the different winding methods) was produced by the conventional continuous winding method.
Comparative example 2
The comparative example was identical to the positive, negative and separator sheets of the second core unit of example 3, and a core having substantially the same thickness as example 3 (rounded to a reserved integer of 60mm, note that it was impossible to achieve the exact identity due to the different winding methods) was produced by the conventional continuous winding method.
Comparative example 3
The comparative example was identical to the positive, negative and separator sheets of the third core unit of example 3, and a core having substantially the same thickness as example 3 (rounded to a reserved integer of 60mm, note that it was impossible to achieve the exact identity due to the different winding methods) was produced by the conventional continuous winding method.
Experimental example
The winding cores provided in each example and comparative example were fabricated into cylindrical batteries, and their electrochemical properties were tested.
The test results are recorded in table 1.
Table 1 electrochemical performance of the cells of each of the examples and comparative examples
As can be seen from the above table, the winding cores provided in the examples all have better electrochemical properties after being made into batteries. Comparing example 3 with each comparative example, the capacity retention rate of example 3 was almost no worse than each comparative example and the energy density was significantly higher, thus it can be seen that the winding core provided by the present application has better electrochemical properties than the existing winding core.
In summary, the winding core provided by the application has the following advantages:
1. the phenomena of pole piece breakage and material dropping caused by large stress of the inner ring of the winding core can be greatly improved;
2. the energy density of the battery can be improved on the premise of ensuring the performance of the battery by adopting pole pieces with different designs for different winding core units;
3. the problem of electrode stress is improved, and the design of the thickness of the battery can be further increased in the direction of the thickness of the existing cylindrical battery, so that the energy density of the battery is increased.
The above description is only of the preferred embodiments of the present application and is not intended to limit the present application, but various modifications and variations can be made to the present application by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the protection scope of the present application.
Claims (7)
1. The winding core is characterized by comprising n (n is more than or equal to 2) winding core units which are sequentially sleeved from inside to outside, wherein each winding core unit comprises a pole piece and a diaphragm, the pole piece comprises a positive pole piece and a negative pole piece, the diaphragm comprises a first diaphragm and a second diaphragm, and each winding core unit consists of the first diaphragm, the negative pole piece, the second diaphragm and the positive pole piece which are sequentially wound;
the formula of the pole piece is as follows:
Σ n ＝α n ％+β n ％+γ n ％，α n % is the active material ratio in the pole piece, beta n % is the ratio of the conductive agent in the pole piece, gamma n % is the binder ratio in the pole piece, Σn=100%, and satisfies the following relationship:
β n ＝a×n b wherein a and b are constants, the value of a is 1-5, and b is-0.393;
γ n ＝c×n d where c and d are constants, d is-0.409, and a and c satisfy c=2.99×a 0.4313 ；
The positive electrode sheet surface density sigma satisfies the formula: sigma (sigma) n =11.3×ln (n) +k, where k has a value of 15 to 25 and σ is mg/cm 2 ；
The negative electrode sheet surface density ω satisfies the formula: c (C) Negative pole ×ω n ×α n is positive ％＝λ×C Positive direction ×σ n ×α n is negative Units of%and omega are mg/cm 2 Wherein lambda is a constant of 1.05 to 1.25, C Positive direction The positive electrode gram capacity is mAh/g; c (C) Negative pole The unit is mAh/g; alpha n is positive % is the active material ratio in the positive plate; alpha n is negative % is the active material ratio in the negative plate.
2. The winding core according to claim 1, wherein the active material in the positive electrode sheet is a nickel cobalt manganese ternary material, lithium iron phosphate or lithium cobalt oxide.
3. The winding core according to claim 1, wherein the active material in the negative electrode sheet is graphite, hard carbon, soft carbon, a silicon negative electrode material, or lithium titanate.
4. The winding core according to claim 1, characterized in that the separator is PP, PE or a composite film of PP and PE or a composite film of PP, PE, PP and PE coated with ceramic or PVDF.
5. A winding core according to any one of claims 1 to 4, characterized in thatThickness D of each winding core unit n Delta multiplied by n+mu, where delta and mu are constants, delta=2 to 6, mu=10 to 20, d n In mm.
6. A method of preparing a winding core according to any one of claims 1 to 5, comprising:
sequentially arranging a first diaphragm, a negative electrode plate, a second diaphragm and a positive electrode plate on a winding needle for winding, and ending after winding is finished to obtain a first winding core unit;
a first diaphragm, a negative electrode plate, a second diaphragm and a positive electrode plate are sequentially arranged on the first winding core unit for winding, and the second winding core unit is obtained after winding is finished;
when n=2, obtaining the second winding core unit to obtain a winding core; when n > 2, winding of at least one core unit on the basis of said second core unit is continued in accordance with the method of obtaining said second core unit.
7. A cylindrical battery comprising a winding core according to any one of claims 1 to 5.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310980328.3A CN116826142A (en) | 2023-08-04 | 2023-08-04 | Rolling core, preparation method thereof and cylindrical battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310980328.3A CN116826142A (en) | 2023-08-04 | 2023-08-04 | Rolling core, preparation method thereof and cylindrical battery |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116826142A true CN116826142A (en) | 2023-09-29 |
Family
ID=88143190
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310980328.3A Pending CN116826142A (en) | 2023-08-04 | 2023-08-04 | Rolling core, preparation method thereof and cylindrical battery |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116826142A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117276768A (en) * | 2023-11-20 | 2023-12-22 | 江苏中兴派能电池有限公司 | Cylindrical battery and preparation method thereof |
-
2023
- 2023-08-04 CN CN202310980328.3A patent/CN116826142A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117276768A (en) * | 2023-11-20 | 2023-12-22 | 江苏中兴派能电池有限公司 | Cylindrical battery and preparation method thereof |
| CN117276768B (en) * | 2023-11-20 | 2024-02-20 | 江苏中兴派能电池有限公司 | Cylindrical battery and preparation method thereof |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN112750976B (en) | Lithium battery core and lithium ion battery | |
| CN111916667A (en) | Negative plate and lithium ion battery comprising same | |
| CN112151851B (en) | Laminated lithium ion battery stack core capable of reducing internal temperature rise | |
| CN105958124B (en) | A kind of lithium ion battery and preparation method thereof | |
| CN111799451B (en) | High-rate lithium battery negative plate and lithium battery | |
| CN108604667B (en) | Electrode for secondary battery including electrode protection layer | |
| CN116826142A (en) | Rolling core, preparation method thereof and cylindrical battery | |
| CN110957456A (en) | Metal-free current collector composite electrode, preparation method thereof and lithium ion battery | |
| CN115548468B (en) | Battery cell, battery and electricity utilization device | |
| CN110718676A (en) | Lithium ion battery positive pole piece, preparation method thereof and lithium ion battery | |
| CN112542565A (en) | Negative plate for improving quick charge capacity of lithium ion battery and preparation method and application thereof | |
| CN114256439A (en) | Pole piece, battery cell, preparation method of pole piece and battery cell, battery and power device | |
| CN219873592U (en) | Battery cell | |
| CN112736217A (en) | Lithium battery negative plate, winding type battery cell and lithium ion battery | |
| CN110504409B (en) | Positive plate capable of improving permeability and lithium ion battery | |
| JP3440520B2 (en) | Non-aqueous electrolyte secondary battery | |
| CN214176073U (en) | Battery pole piece, battery roll core, battery and current collector | |
| CN114597415A (en) | Negative plate and lithium ion battery | |
| CN112713301B (en) | Energy storage device | |
| JP3388265B2 (en) | Lead-acid battery separator | |
| CN105470587B (en) | Nickel-hydrogen secondary battery | |
| CN113314697A (en) | Battery core and battery | |
| JPH0785885A (en) | Rectangular battery | |
| CN218215360U (en) | Electrode plate, battery cell and battery | |
| CN220604746U (en) | Lithium ion battery with high cycle performance |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |