CN112259806A - Manufacturing method of winding type battery and winding type battery semi-finished product structure - Google Patents
Manufacturing method of winding type battery and winding type battery semi-finished product structure Download PDFInfo
- Publication number
- CN112259806A CN112259806A CN202011200145.8A CN202011200145A CN112259806A CN 112259806 A CN112259806 A CN 112259806A CN 202011200145 A CN202011200145 A CN 202011200145A CN 112259806 A CN112259806 A CN 112259806A
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- Prior art keywords
- battery
- semi
- change material
- metal foil
- finished
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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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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/052—Li-accumulators
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
Abstract
The invention discloses a method for manufacturing a winding type battery and a winding type battery semi-finished product structure, wherein the method for manufacturing the battery comprises the following steps: winding a positive plate, a negative plate and a diaphragm which form the battery core together to form the battery core, ending with a metal foil in the process of winding and forming the battery core, and enabling the metal foil to form the peripheral surface of the battery core; heating the solid-liquid phase change material to change the solid-liquid phase change material into a liquid state, coating the liquid phase change material on the edge sealing position of the metal foil, and forming an edge sealing bonding layer at the tail end of the metal foil; installing insulating sheets at the upper end and the lower end of the battery core subjected to edge sealing treatment, and installing the battery core and the insulating sheets into a metal battery shell to form a semi-finished battery; and baking the semi-finished battery to remove water in the semi-finished battery, and enabling the phase change material forming the edge sealing adhesive layer to melt and flow onto the insulating sheet at the bottom of the semi-finished battery. The battery manufactured by the battery manufacturing method has high heat dissipation efficiency and low internal resistance.
Description
Technical Field
The invention relates to the technical field of manufacturing processes of winding type batteries, in particular to a manufacturing method of a winding type battery and a winding type battery semi-finished product structure.
Background
The wound battery is a battery in which a material such as positive and negative electrode sheets and a separator constituting a battery core is wound to form a battery core, and the battery core is loaded in a case. Taking a cylindrical lithium battery as an example, during manufacturing of a battery core, a diaphragm or a copper foil is usually adopted for ending, in order to prevent the battery core from loosening, edge sealing treatment is mostly adopted in a manner of sticking a termination adhesive tape on the outermost ring of the battery core at present, the termination adhesive tape mostly adopts a polymer film such as PP, PET, PI and the like as a substrate, and acrylic glue is coated on the surface of the substrate. Because this kind of sticky tape heat conduction rate is low, keeps apart between battery core and metal casing, leads to battery radiating efficiency poor, and the charge-discharge temperature risees, further leads to battery decay rate fast, and the thermal runaway risk is high.
Based on the problems, the manufacturing method of the winding type battery in the prior art is improved.
Disclosure of Invention
One objective of the present invention is to provide a method for manufacturing a winding type battery, which improves the fixing manner of the winding end of the battery core to improve the heat dissipation efficiency of the battery.
Another object of the present invention is to provide a winding type battery semi-finished product structure with high heat dissipation efficiency.
In order to achieve the purpose, the invention discloses a manufacturing method of a winding type battery, which comprises the following steps:
winding the positive plate, the negative plate and the diaphragm together to form a battery core, ending with a metal foil in the process of winding and forming the battery core, and enabling the metal foil to form the outer peripheral surface of the battery core;
heating the solid-liquid phase change material to be in a liquid state, coating the liquefied phase change material on the edge sealing position of the metal foil, and forming an edge sealing bonding layer at the tail end of the metal foil when the liquefied phase change material returns to be in a solid state;
installing insulating sheets at the upper end and the lower end of the battery core subjected to edge sealing treatment, and installing the battery core and the insulating sheets into a metal battery shell to form a semi-finished battery;
and baking the semi-finished battery to remove moisture in the semi-finished battery, and enabling the phase change material forming the edge sealing adhesive layer to melt and flow to the insulating sheet at the bottom of the semi-finished battery.
Compared with the prior art, the winding type battery manufacturing method adopts the liquid-state body of the solid-liquid phase-change material to be coated at the tail end of the wound battery core, and when the phase-change material is solidified into a solid state due to temperature reduction, an edge sealing bonding layer is formed, so that the manufacturing process of the battery core is finished, and then the manufactured battery core is filled into the battery shell to form a semi-finished battery; the phase-change material can be changed into a flowing liquid body when being heated, so that when the semi-finished battery is baked, the phase-change material fixed at the edge sealing position of the outermost layer of the battery core is changed into a liquid state again and flows onto the insulating sheet at the bottom, the edge sealing bonding layer disappears, at the moment, the battery core is completely bound by the battery case and cannot be loosened, the metal foil positioned at the periphery of the battery core is directly contacted with the battery case, and no other medium for obstructing heat transfer exists in the middle of the battery.
Preferably, the phase change material is paraffin.
Preferably, the temperature for baking the semi-finished battery is 80-90 ℃.
Preferably, the metal foil is a copper foil.
Preferably, the thickness of the edge sealing bonding layer is 0.1-0.2 mm.
The invention also discloses a winding type semi-finished battery structure which comprises a metal battery shell and a battery core filled in the battery shell, wherein the battery core is formed by winding a winding material, the peripheral surface of the battery core is a metal foil, the tail end of the metal foil is coated with a liquefied solid-liquid phase change material, the phase change material is in a solid state at normal temperature and can be changed into a liquid state by heating, and when the phase change material returns to the solid state, an edge sealing bonding layer for sealing the tail end of the metal foil is formed.
Preferably, the phase change material is paraffin.
Preferably, the metal foil is a copper foil.
Preferably, the thickness of the edge sealing bonding layer is 0.1-0.2 mm.
Preferably, the width of the edge sealing bonding layer is 6-15 mm.
Drawings
Fig. 1 is a flow chart of a method for manufacturing a wound battery according to an embodiment of the present invention.
Fig. 2 is a schematic view of an expanded structure of a battery cell according to an embodiment of the present invention.
Fig. 3 is a schematic view of a battery cell structure formed by winding the respective webs of fig. 2 together.
Fig. 4 is a schematic cross-sectional view of a wound battery cell according to an embodiment of the present invention.
Fig. 5 is a schematic view of a conventional structure of a winding type battery.
Detailed Description
In order to explain technical contents, structural features, and objects and effects of the present invention in detail, the following detailed description is given with reference to the accompanying drawings in conjunction with the embodiments.
In order to facilitate the description of the manufacturing method in this embodiment, a brief description is first made on the conventional structure of the winding type battery, as shown in fig. 5, which takes a cylindrical lithium battery as an example, and includes a positive electrode sheet 10 ', a negative electrode sheet 11 ', a first separator sheet 12 ', a second separator sheet 13 ', a positive electrode tab 14 ', and a negative electrode tab 15 ', the positive electrode sheet 10 ' is located at the winding inner layer, the first separator sheet 12 ' is located between the positive electrode sheet 10 ' and the negative electrode sheet 11 ', the second separator sheet 13 ' is located at the outer side of the negative electrode sheet 11 ', the positive electrode tab 14 ' is electrically connected with the positive electrode sheet 10 ', the negative electrode tab 15 ' is electrically connected with the negative electrode sheet 11 ', and the above coils (the positive electrode sheet 10 ', the negative electrode sheet 11 ', the first separator sheet 12 ', and the second separator sheet 13 ') are stacked together and wound to form a battery core 1 '.
As shown in fig. 1 to 4, the manufacturing method in this embodiment includes the following steps:
s1, winding step: winding materials such as a positive plate 10, a negative plate 11, a diaphragm 12 (including a first inner diaphragm plate 120 and an outer diaphragm plate 121) and the like which form a battery core 1 together to form the battery core 1, wherein a positive tab 13 connected to the positive plate 10 and a negative tab 14 connected to the negative plate 11 protrude out of the battery core 1, and a metal foil 15 is used for ending in the process of winding and forming the battery core 1, so that the metal foil 15 forms the outer peripheral surface of the battery core 1 (as shown in fig. 3), that is, the outermost layer of the battery core 1 is the metal foil 15, and specifically, the metal foil is connected to the tail of the negative plate 11;
s2, edge sealing process: selecting a solid-liquid phase change material which can be converted between a solid state and a liquid state along with the temperature, preferably selecting a phase change material which is solid at normal temperature, heating the phase change material to enable the phase change material to be liquid, coating the liquid phase change material on the edge sealing position of the metal foil 15, and forming an edge sealing bonding layer 16 at the tail end of the metal foil 15 along with the temperature reduction when the liquid phase change material returns to the solid state so as to finish the edge sealing treatment of the metal foil 15;
s3, assembling: and installing insulating sheets 3 at the upper end and the lower end of the battery core 1 subjected to edge sealing treatment, installing the battery core 1 and the insulating sheets 3 into the metal battery shell 2, and installing a cap 4 at the upper end of the battery shell 2 to form a semi-finished battery, wherein the insulating sheets 3 are conventional structural members of a winding type battery, and the description is omitted here.
S4, baking: baking the semi-finished cell to remove moisture therefrom and to cause the phase change material forming the edge seal adhesive layer 16 to melt and flow onto the insulating sheet at the bottom of the semi-finished cell, preferably in an upright position during baking to facilitate the downward flow of the liquid phase change material.
According to the manufacturing method of the battery, as the outermost layer of the battery core 1 is the metal foil 15, and the phase-change material is used for edge sealing treatment of the metal foil 15, when the semi-finished battery is baked, the phase-change material fixed at the edge sealing position of the outermost layer of the battery core 1 is changed into liquid state again and flows onto the insulating sheet at the bottom, the edge sealing bonding layer 16 disappears, at this time, the battery core 1 is completely bound by the battery case 2 and cannot be loosened, the metal foil 15 positioned at the periphery of the battery core 1 is directly contacted with the battery case 2, no other medium for obstructing heat transfer exists in the middle, due to the excellent electrical conductivity and thermal conductivity of the metal foil 15, on one hand, the internal resistance of the battery can be reduced, so as to reduce the heat generated in the charging and discharging process, on the other hand, the metal foil 15 is directly contacted with, the overall heat dissipation efficiency of the battery is also improved.
Specifically, the phase change material in this embodiment is preferably a wax paper phase change material, such as paraffin, which has a melting point of 47-67 ℃, and therefore, the temperature for baking the semi-finished battery is preferably set to 80-90 ℃, so that the solid paraffin on the battery core 1 can be completely melted, the moisture in the battery core 1 can be removed to the maximum extent, and the battery core 1 cannot be damaged. More specifically, the paraffin wax forming the edge sealing bonding layer 16 has a thickness of 0.1-0.2 mm and a width of 6-15 mm. In addition, the metal foil 15 is preferably a copper foil, which has excellent electric and thermal conductive properties.
As shown in fig. 3 and 4, the invention further discloses a winding type semi-finished battery structure, which comprises a metal battery case 2 and a battery core 1 filled in the battery case 2, wherein the battery core 1 is formed by winding a winding material, the peripheral surface of the battery core 1 is a metal foil 15, the tail end of the metal foil 15 is coated with a liquefied solid-liquid phase change material, the phase change material is solid at normal temperature and can be changed into liquid by heating, and when the phase change material returns to the solid state, an edge sealing bonding layer 16 for sealing the tail end of the metal foil 15 is formed. Preferably, the phase change material in this embodiment is paraffin, the metal foil 15 is copper foil, and the edge bonding layer 16 has a thickness of 0.1 to 0.2mm and a width of 6 to 15 mm. In addition, for the structure of the semi-finished product of the battery in this embodiment, the specific process for changing the structure of the semi-finished product of the battery into the battery, and the details of the above manufacturing method of the winding type battery, no further description is given here.
The above disclosure is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the scope of the present invention, therefore, the present invention is not limited by the appended claims.
Claims (10)
1. A method for manufacturing a winding type battery is characterized by comprising the following steps:
winding the positive plate, the negative plate and the diaphragm together to form a battery core, ending with a metal foil in the process of winding and forming the battery core, and enabling the metal foil to form the outer peripheral surface of the battery core;
heating the solid-liquid phase change material to be in a liquid state, coating the liquefied phase change material on the edge sealing position of the metal foil, and forming an edge sealing bonding layer at the tail end of the metal foil when the liquefied phase change material returns to be in a solid state;
installing insulating sheets at the upper end and the lower end of the battery core subjected to edge sealing treatment, and installing the battery core and the insulating sheets into a metal battery shell to form a semi-finished battery;
and baking the semi-finished battery to remove moisture in the semi-finished battery, and enabling the phase change material forming the edge sealing adhesive layer to melt and flow to the insulating sheet at the bottom of the semi-finished battery.
2. The method of claim 1, wherein the phase change material is paraffin.
3. The method for manufacturing a wound-type battery according to claim 2, wherein the temperature for baking the semi-finished battery is 80 to 90 ℃.
4. The method of claim 1, wherein the metal foil is copper foil.
5. The manufacturing method of the winding type battery according to claim 1, wherein the thickness of the edge sealing bonding layer is 0.1-0.2 mm.
6. The semi-finished product structure of the winding type battery is characterized by comprising a metal battery shell and a battery core filled in the battery shell, wherein the battery core is formed by winding a winding material, a metal foil is arranged on the peripheral surface of the battery core, the tail end of the metal foil is coated with a liquefied solid-liquid phase change material, the phase change material is in a solid state at normal temperature and can be changed into a liquid state by heating, and when the phase change material returns to the solid state, an edge sealing bonding layer for sealing the tail end of the metal foil is formed.
7. The wound-type battery semi-finished structure of claim 6, wherein the phase-change material is paraffin.
8. The jelly-roll type battery semi-finished product structure according to claim 6, wherein the metal foil is a copper foil.
9. The semi-finished structure of the winding type battery as claimed in claim 6, wherein the thickness of the edge sealing bonding layer is 0.1-0.2 mm.
10. The semi-finished structure of the rolled battery according to claim 9, wherein the width of the edge sealing adhesive layer is 6-15 mm.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011200145.8A CN112259806B (en) | 2020-10-30 | 2020-10-30 | Manufacturing method of winding type battery and winding type battery semi-finished product structure |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011200145.8A CN112259806B (en) | 2020-10-30 | 2020-10-30 | Manufacturing method of winding type battery and winding type battery semi-finished product structure |
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| CN112259806A true CN112259806A (en) | 2021-01-22 |
| CN112259806B CN112259806B (en) | 2022-05-17 |
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| Publication number | Publication date |
|---|---|
| CN112259806B (en) | 2022-05-17 |
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