CN110890577A - Electrochemical device and preparation method thereof - Google Patents
Electrochemical device and preparation method thereof Download PDFInfo
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- CN110890577A CN110890577A CN201811044033.0A CN201811044033A CN110890577A CN 110890577 A CN110890577 A CN 110890577A CN 201811044033 A CN201811044033 A CN 201811044033A CN 110890577 A CN110890577 A CN 110890577A
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- shell frame
- negative electrode
- positive electrode
- skin
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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
- H01M10/04—Construction or manufacture in general
- H01M10/0431—Cells with wound or folded electrodes
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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
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/531—Electrode connections inside a battery casing
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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
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- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Secondary Cells (AREA)
- Sealing Battery Cases Or Jackets (AREA)
Abstract
The invention discloses an electrochemical device, which comprises a shell frame, a roll core, a positive electrode and a negative electrode, wherein the shell frame is of a cuboid structure and is characterized in that: the top surface and the bottom surface of the shell frame, which are perpendicular to the end surface of the electrode, are both of an open structure, a winding core is arranged in the shell frame, the thickness of the winding core is greater than or equal to the height of the side surface of the shell frame, the top surface and the bottom surface of the shell frame are tightly attached to the winding core and are respectively provided with an upper skin and a lower skin, the peripheral edges of the upper skin and the lower skin are welded and sealed with the shell frame in a flat manner, and a top cover and a bottom cover of the; the side surface of the shell frame is provided with a hole I for a positive electrode to penetrate out and a hole II for a negative electrode to penetrate out, and the positive electrode and the negative electrode are respectively arranged in the hole I and the hole II. Compared with the prior art, the invention improves the energy density of the battery, can bear large-current charge and discharge, and is convenient for the rolling core to compact and eliminate gaps by adopting the skin with the same size as the shell frame.
Description
Technical Field
The invention relates to the technical field of electrochemistry, in particular to an electrochemical device for high-power large-current charging and discharging and a preparation method thereof.
Background
With the development of modern electronic technology, the number of miniaturized devices is increasing, and high requirements are made on power supplies. The electrochemical device then enters a large-scale practical stage. The electrochemical device is mainly used for personal small-sized electrical appliances such as mobile phones, notebook computers and the like in the early stage, along with the development of technology and the expansion of fields, the electrochemical device begins to develop into the fields of motorcycles, automobiles, electric tools and electric vehicles, and particularly, in the near term, the electrochemical device is used as a high-power charging and discharging power supply for vehicles, and the development is rapid.
However, the traditional electrochemical device is designed by a steel shell, an aluminum-plastic film or a plastic shell, and the like, and the current leading-out structure is designed according to low-current charge and discharge, so that the current leading-out structure is difficult to bear large-current charge and discharge, and the use effect and the load requirement of the electrochemical device are influenced. The traditional square aluminum shell battery case is provided with an electrode, a winding core lug is fixedly connected with the electrode and a cover plate in advance and then is arranged in the case, and then the cover plate on the opening end face of the battery case is welded with the case. In order to facilitate the winding of the core into the case, the size of the winding core is smaller than the internal size of the inlet end face of the case body of the battery when the battery is designed, so that the capacity of the battery is lost.
Disclosure of Invention
In order to solve the problems that the existing electrochemical device is difficult to bear large-current charge and discharge and the battery capacity is lost, the invention provides the electrochemical device and the preparation method thereof, which can bear large-current charge and discharge and improve the energy density of the battery.
The object of the invention is achieved in the following way:
the utility model provides an electrochemical device, includes casing frame, rolls up core, positive electrode and negative electrode, and the casing frame is cuboid form structure, its characterized in that: the top surface and the bottom surface of the shell frame, which are perpendicular to the end surface of the electrode, are both of an open structure, a winding core is arranged in the shell frame, the thickness of the winding core is greater than or equal to the height of the side surface of the shell frame, the top surface and the bottom surface of the shell frame are tightly attached to the winding core and are respectively provided with an upper skin and a lower skin, the peripheral edges of the upper skin and the lower skin are welded and sealed with the shell frame in a flat manner, and a top cover and a bottom cover of the; the side surface of the shell frame is provided with a hole I for a positive electrode to penetrate out and a hole II for a negative electrode to penetrate out, and the positive electrode and the negative electrode are respectively arranged in the hole I and the hole II.
The size of the skin is consistent with the size of the outer wall of the top surface or the bottom surface of the shell frame.
The size of the skin is consistent with the size of the inner wall of the top surface or the bottom surface of the shell frame.
The positive electrode and the negative electrode are respectively disposed on two opposite sides of the case frame.
The winding core comprises a positive electrode full lug and a negative electrode full lug, the positive electrode full lug is welded with the positive electrode, and the negative electrode full lug is welded with the negative electrode.
The positive electrode full lug and the positive electrode are welded together by laser welding or ultrasonic welding, and the negative electrode full lug and the negative electrode are also welded together by laser welding or ultrasonic welding.
The positive electrode and the negative electrode are disposed on the same side of the case frame.
The skin and the shell frame are welded together by laser welding or friction stir welding.
The preparation method of the electrochemical device comprises the following specific steps:
(1) preparing a shell frame: firstly, raw materials are manufactured into a shell frame with an opening structure on the top surface and the bottom surface by adopting stretching forming and stamping processes, and then a hole I and a hole II on the side surface of the shell frame are stamped;
(2) preparing the skin: the skin is made of raw materials by adopting a stamping process;
(3) preparation of a roll core: a winding core is manufactured in a full-lug winding mode, a negative plate, a diaphragm, a positive plate and a diaphragm are sequentially placed during winding, and the winding core comprises a positive full lug and a negative full lug;
(4) preparation of electrochemical device: firstly, respectively installing a positive electrode and a negative electrode on a hole I and a hole II on the side surface of a shell frame, installing an insulating sealing ring and an insulating sealing gasket between the electrode and the shell frame, then putting a winding core into a shell from an opening position of the shell frame, and respectively welding a positive electrode full lug and a negative electrode full lug on the winding core with the positive electrode and the negative electrode by adopting laser welding or ultrasonic welding; secondly, compacting the winding core in the shell frame by the upper skin and the lower skin under the action of external pre-compression force, and respectively welding the upper skin and the lower skin with the shell frame by laser welding or friction stir welding to form a top cover and a bottom cover of the shell frame; the end face of the shell frame where the electrode is located is provided with a liquid injection hole, electrolyte is injected from the liquid injection hole, and the sealing nail is welded by adopting a friction stir welding process, so that the electrolyte is prevented from overflowing, and the electrochemical device is manufactured.
The raw material is aluminum material or aluminum alloy.
Compared with the prior art, the invention has the following advantages:
1. the thickness of the winding core is slightly larger than or equal to the height of the side face of the shell frame, the positive electrode and the negative electrode are assembled with the shell frame in advance, after the winding core is placed into the shell, the pole lugs of the winding core are welded with the electrodes, and the winding core in the shell is compacted and then welded under the action of external pre-compression force of the upper skin and the lower skin, so that the energy density of the battery is improved;
2. the size of the skin is consistent with that of the outer wall of the shell frame or consistent with that of the inner wall of the shell frame, so that a winding core is compacted and a gap is eliminated, and the sealing of a welding position is ensured by adopting laser welding or friction stir welding;
3. the positive and negative electrode lugs are of a full lug structure, so that the flow guide sectional area of the lugs is maximized, the electric conductivity and the heat conductivity of chemical components are improved, and large-current charging and discharging are facilitated.
Drawings
FIG. 1 is a top view of an apparatus according to example 1 of the present invention.
FIG. 2 is a top view of an apparatus according to example 2 of the present invention.
Wherein 1 is a case frame, 2 is a winding core, 3 is a positive electrode, 4 is a skin, and 5 is a negative electrode.
Detailed Description
Example 1
As shown in fig. 1, an electrochemical device includes a casing frame 1, a winding core 2, a positive electrode 3 and a negative electrode 5, the casing frame 1 is a rectangular parallelepiped structure, or other structures, the top surface and the bottom surface of the casing frame 1 perpendicular to the end surface of the electrode are both open structures, i.e. a hollow tetragonal structure, the winding core 2 is arranged in the casing frame 1, the thickness of the winding core 2 is greater than or equal to the height of the side surface of the casing frame 1, and is slightly greater than the side surface, the top surface and the bottom surface of the casing frame 1 are respectively provided with an upper skin and a lower skin close to the winding core 2, the peripheral edges of the upper skin and the lower skin are welded and sealed with the casing frame 1 in a flat manner, and a top cover and a; the side surface of the shell frame 1 is provided with a hole I (not marked in the figure) for the positive electrode 3 to penetrate out and a hole II (not marked in the figure) for the negative electrode 5 to penetrate out, and the positive electrode 3 and the negative electrode 5 are respectively arranged in the hole I and the hole II. The core 2 is located between the upper and lower skins.
An insulating sealing ring and an insulating sealing gasket are arranged between the positive electrode 3 or the negative electrode 5 and the shell frame 1. The fixed sealing connection mode between the positive electrode 3 or the negative electrode 5 and the shell frame 1 is bolt connection, riveting, upsetting connection or friction stir welding, or other common connection modes. The positive electrode full tab and the negative electrode full tab are formed on the winding core 2, specifically, directly formed on the positive electrode sheet and the negative electrode sheet, and it is obvious that the sectional area of the positive electrode full tab is the product of the thickness of the positive electrode sheet base material and the length of the positive electrode sheet base material, and the sectional area of the negative electrode full tab is the product of the thickness of the negative electrode sheet base material and the length of the negative electrode sheet base material.
In order to facilitate the compaction of the winding core 2 and to eliminate gaps, the skin 4 is dimensioned to correspond to the outer wall dimensions of the top or bottom side of the casing frame 1.
In order to facilitate the compaction of the reeling core 2 and to eliminate gaps, the skin 4 is dimensioned to correspond to the inner wall dimensions of the top or bottom side of the shell frame 1.
As shown in fig. 1, the positive electrode 3 and the negative electrode 5 are respectively disposed on two opposite side surfaces of the case frame 1, and an axis along which the positive electrode 3 and the negative electrode 5 are connected is one of central axes of the side surfaces of the case frame 1.
In order to enable the electrochemical device to bear large-current charge and discharge, the winding core 2 comprises a positive full lug and a negative full lug, the positive full lug is welded with the positive electrode 3, and the negative full lug is welded with the negative electrode 5. Suitably, the positive electrode full tab and the negative electrode full tab are formed on two sides of the winding core 2, so as to be conveniently connected with the positive electrode 3 and the negative electrode 5.
In order to make the sealing performance of the welding position better, the positive electrode full tab and the positive electrode 3 are welded together by laser welding or ultrasonic welding, and the negative electrode full tab and the negative electrode 5 are also welded together by laser welding or ultrasonic welding.
In order to make the welding position more airtight, the skin 4 and the shell frame 1 are welded together by laser welding or friction stir welding.
In order to ensure that the full tab can have a sufficiently large contact area with the electrode, the positive electrode 3 is made of aluminum, and the sectional area of the aluminum is not less than that of the positive full tab; the negative electrode 5 is made of copper or copper-aluminum composite material, and the sectional area of the negative electrode is not smaller than that of the negative electrode full lug.
The preparation method of the electrochemical device comprises the following specific steps:
(1) preparation of the housing frame 1: firstly, raw materials are manufactured into a shell frame 1 with an opening structure on the top surface and the bottom surface by adopting stretching forming and stamping processes, and then a hole I and a hole II on the side surface of the shell frame 1 are stamped;
(2) preparation of the skin 4: the skin 4 is made of raw materials by adopting a stamping process;
(3) preparation of the roll core 2: a winding core 2 is manufactured in a full-lug winding mode, a negative plate, a diaphragm, a positive plate and a diaphragm are sequentially placed during winding, and the winding core 2 comprises a positive full lug and a negative full lug;
(4) preparation of electrochemical device: firstly, respectively installing a positive electrode 3 and a negative electrode 5 on a hole I and a hole II on the side surface of a shell frame 1, installing an insulating sealing ring and an insulating sealing gasket between the electrode and the shell frame 1, then putting a winding core 2 into a shell from the opening position of the shell frame 1, and respectively welding a positive full lug and a negative full lug on the winding core 2 with the positive electrode 3 and the negative electrode 5 by adopting laser welding or ultrasonic welding; secondly, compacting the winding core 2 in the shell frame 1 by the upper skin and the lower skin under the action of external pre-compression force, and respectively welding the upper skin and the lower skin with the shell frame 1 by laser welding or friction stir welding to form a top cover and a bottom cover of the shell frame 1; the end face of the shell frame 1 where the electrode is located is provided with a liquid injection hole, the liquid injection hole is arranged on the end face of the shell frame 1 where the positive electrode 3 is located in the embodiment 1, electrolyte is injected from the liquid injection hole, and the sealing nail is welded by adopting a friction stir welding process, so that the electrolyte is prevented from overflowing, and the electrochemical device is manufactured.
The raw material is aluminum material or aluminum alloy.
Example 2
The present embodiment 2 differs from embodiment 1 in that: the positive electrode 3 and the negative electrode 5 are arranged on the same side of the housing frame 1, as shown in fig. 2; correspondingly, a positive electrode full lug and a negative electrode full lug are formed at one end of the winding core 2, so that the positive electrode full lug and the negative electrode full lug can be conveniently connected with the positive electrode 3 and the negative electrode 5; in the method for manufacturing an electrochemical device, in the step (4), the injection holes in this example 2 are provided on the end faces of the case frame 1 where the positive electrode 3 and the negative electrode 5 are located.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various changes and modifications can be made without departing from the overall concept of the invention, and these should be considered as the protection scope of the present invention, which will not affect the effect of the implementation of the present invention and the practicability of the patent.
Claims (10)
1. The utility model provides an electrochemical device, includes casing frame, rolls up core, positive electrode and negative electrode, and the casing frame is cuboid form structure, its characterized in that: the top surface and the bottom surface of the shell frame, which are perpendicular to the end surface of the electrode, are both of an open structure, a winding core is arranged in the shell frame, the thickness of the winding core is greater than or equal to the height of the side surface of the shell frame, the top surface and the bottom surface of the shell frame are tightly attached to the winding core and are respectively provided with an upper skin and a lower skin, the peripheral edges of the upper skin and the lower skin are welded and sealed with the shell frame in a flat manner, and a top cover and a bottom cover of the; the side surface of the shell frame is provided with a hole I for a positive electrode to penetrate out and a hole II for a negative electrode to penetrate out, and the positive electrode and the negative electrode are respectively arranged in the hole I and the hole II.
2. The electrochemical device of claim 1, wherein: the size of the skin is consistent with the size of the outer wall of the top surface or the bottom surface of the shell frame.
3. The electrochemical device of claim 1, wherein: the size of the skin is consistent with the size of the inner wall of the top surface or the bottom surface of the shell frame.
4. The electrochemical device of claim 1, wherein: the positive electrode and the negative electrode are respectively disposed on two opposite sides of the case frame.
5. The electrochemical device of claim 1, wherein: the winding core comprises a positive electrode full lug and a negative electrode full lug, the positive electrode full lug is welded with the positive electrode, and the negative electrode full lug is welded with the negative electrode.
6. The electrochemical device of claim 5, wherein: the positive electrode full lug and the positive electrode are welded together by laser welding or ultrasonic welding, and the negative electrode full lug and the negative electrode are also welded together by laser welding or ultrasonic welding.
7. The electrochemical device of claim 1, wherein: the positive electrode and the negative electrode are disposed on the same side of the case frame.
8. The electrochemical device of claim 1, wherein: the skin and the shell frame are welded together by laser welding or friction stir welding.
9. The method of manufacturing an electrochemical device according to any one of claims 1 to 8, wherein: the method comprises the following specific steps:
preparing a shell frame: firstly, raw materials are manufactured into a shell frame with an opening structure on the top surface and the bottom surface by adopting stretching forming and stamping processes, and then a hole I and a hole II on the side surface of the shell frame are stamped;
preparing the skin: the skin is made of raw materials by adopting a stamping process;
preparation of a roll core: a winding core is manufactured in a full-lug winding mode, a negative plate, a diaphragm, a positive plate and a diaphragm are sequentially placed during winding, and the winding core comprises a positive full lug and a negative full lug;
preparation of electrochemical device: firstly, respectively installing a positive electrode and a negative electrode on a hole I and a hole II on the side surface of a shell frame, installing an insulating sealing ring and an insulating sealing gasket between the electrode and the shell frame, then putting a winding core into a shell from an opening position of the shell frame, and respectively welding a positive electrode full lug and a negative electrode full lug on the winding core with the positive electrode and the negative electrode by adopting laser welding or ultrasonic welding; secondly, compacting the winding core in the shell frame by the upper skin and the lower skin under the action of external pre-compression force, and respectively welding the upper skin and the lower skin with the shell frame by laser welding or friction stir welding to form a top cover and a bottom cover of the shell frame; the end face of the shell frame where the electrode is located is provided with a liquid injection hole, electrolyte is injected from the liquid injection hole, and the sealing nail is welded by adopting a friction stir welding process, so that the electrolyte is prevented from overflowing, and the electrochemical device is manufactured.
10. The method of manufacturing an electrochemical device according to claim 9, wherein: the raw material is aluminum material or aluminum alloy.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811044033.0A CN110890577A (en) | 2018-09-07 | 2018-09-07 | Electrochemical device and preparation method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811044033.0A CN110890577A (en) | 2018-09-07 | 2018-09-07 | Electrochemical device and preparation method thereof |
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| CN110890577A true CN110890577A (en) | 2020-03-17 |
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| CN201811044033.0A Pending CN110890577A (en) | 2018-09-07 | 2018-09-07 | Electrochemical device and preparation method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023272438A1 (en) * | 2021-06-28 | 2023-01-05 | Hefei Gotion High-Tech Power Energy Co., Ltd. | Cylindrical battery cell, battery and method for forming cylindrical battery cell |
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2018
- 2018-09-07 CN CN201811044033.0A patent/CN110890577A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023272438A1 (en) * | 2021-06-28 | 2023-01-05 | Hefei Gotion High-Tech Power Energy Co., Ltd. | Cylindrical battery cell, battery and method for forming cylindrical battery cell |
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