CN212517284U - Battery housing for lithium ion battery capable of being maintained and repaired and lithium ion battery thereof - Google Patents
Battery housing for lithium ion battery capable of being maintained and repaired and lithium ion battery thereof Download PDFInfo
- Publication number
- CN212517284U CN212517284U CN202020702486.4U CN202020702486U CN212517284U CN 212517284 U CN212517284 U CN 212517284U CN 202020702486 U CN202020702486 U CN 202020702486U CN 212517284 U CN212517284 U CN 212517284U
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- battery
- sealing
- lithium ion
- battery shell
- cap
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- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 title claims abstract description 45
- 229910001416 lithium ion Inorganic materials 0.000 title claims abstract description 45
- 238000007789 sealing Methods 0.000 claims abstract description 96
- 238000000926 separation method Methods 0.000 claims abstract description 15
- 239000004568 cement Substances 0.000 claims description 8
- 229910052751 metal Inorganic materials 0.000 claims description 3
- 239000002184 metal Substances 0.000 claims description 3
- 238000000034 method Methods 0.000 abstract description 8
- 238000009825 accumulation Methods 0.000 abstract description 3
- 230000002035 prolonged effect Effects 0.000 abstract description 3
- 239000003792 electrolyte Substances 0.000 description 20
- 239000007789 gas Substances 0.000 description 11
- 238000012423 maintenance Methods 0.000 description 6
- 239000002904 solvent Substances 0.000 description 5
- 238000001179 sorption measurement Methods 0.000 description 4
- 230000006378 damage Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000004880 explosion Methods 0.000 description 3
- 229910052744 lithium Inorganic materials 0.000 description 3
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 2
- 238000004140 cleaning Methods 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- PQXKHYXIUOZZFA-UHFFFAOYSA-M lithium fluoride Chemical compound [Li+].[F-] PQXKHYXIUOZZFA-UHFFFAOYSA-M 0.000 description 2
- 229910003002 lithium salt Inorganic materials 0.000 description 2
- 159000000002 lithium salts Chemical class 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000007086 side reaction Methods 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000009172 bursting Effects 0.000 description 1
- 230000001413 cellular effect Effects 0.000 description 1
- 239000004927 clay Substances 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000013538 functional additive Substances 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 150000005677 organic carbonates Chemical class 0.000 description 1
- 239000003960 organic solvent Substances 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 239000010926 waste battery Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Images
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
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- Secondary Cells (AREA)
- Gas Exhaust Devices For Batteries (AREA)
Abstract
The utility model discloses a battery shell for a lithium ion battery which can be maintained and repaired and a lithium ion battery thereof, wherein the battery shell consists of a battery shell and a cap; the top of the battery case is connected with the cap, and the bottom of the battery case is provided with two sealing valve structures, for example, a round hole is formed in the bottom of the cylindrical battery case, and for example, a separation net is arranged in the square battery case; the cover cap is provided with two sealing valve structures and an explosion-proof valve, if the cover cap is a round cover cap, a round hole is arranged, and if the cover cap is a square cover cap, the round hole is not arranged; the utility model mainly prevents the internal pressure or temperature from opening and releasing pressure when reaching the preset standard due to excessive gas accumulation inside the battery through the function of the explosion-proof valve, and prevents the deformation and burst of the shell of the battery caused by the influence of the internal pressure and temperature; the restoration of the pole piece interface in the lithium ion battery and the restoration of the initial capacitance of the lithium ion battery are realized by the function of the sealing valve structure, the cycle life of the battery is doubled and prolonged, and the safety and stability of the battery in the use process are ensured.
Description
Technical Field
The utility model relates to a lithium ion secondary battery technical field especially relates to a battery case and lithium ion battery for can maintaining and prosthetic lithium ion battery.
Background
With the advent of the electric automobile age and the trend of the electric automobile, governments and automobile companies around the world actively promote the development of the application of the electric automobile technology. The core of the electric automobile is a battery, the existing battery system is mainly a lithium ion battery, in the practical use of the battery, an electrolyte composed of an organic carbonate solvent and a functional additive is generated and destroyed along with the continuous generation and destruction of an SEI film in the first and subsequent normal battery charging and discharging processes, and along with the progress of charging and discharging circulation, the quantity of gas accumulated in the battery is more and more, the internal pressure of the battery is increased, and the potential safety and stability of the battery are hidden troubles.
Along with the increase of the volume, the accumulation of energy and the deterioration of the use environment, the possibility of explosion caused by gas generation due to damage of a sealed battery and the damage degree caused by the explosion are increased, and the longer the use time of the battery is, the more and more gas is generated in the battery due to the decomposition of electrolyte, the content of the electrolyte is reduced, and the thickness of an unstable SEI film is increased, so that the internal resistance of the battery is increased, and the cycle life of the battery is influenced. There is therefore a need to develop a battery technology that can extend the long cycle life of a lithium ion battery.
Disclosure of Invention
Two main causes of capacity fade for lithium ion batteries: firstly, the interface impedance is increased due to gas generation and interface side reaction; and secondly, the electrolyte is consumed by the interface side reaction due to long-time circulation, so that the amount of the electrolyte is reduced and even the electrolyte is dried up. In the first case, the interfacial resistance is mainly caused by deposition of the SEI layer covering the electrode surface. Based on this, it is necessary to find an effective method for reducing the thickness of the SEI film on the surface of the electrode. The main substances of the SEI layer are lithium alkyl carbonate, lithium fluoride and the like. Some of these materials of the SEI layer may be dissolved by a corresponding organic solvent.
To the problem that above-mentioned present lithium ion battery that provides exists, the utility model provides a battery case and lithium ion battery for can maintaining and prosthetic lithium ion battery.
The technical scheme is as follows:
a battery shell for a lithium ion battery capable of being maintained and repaired mainly comprises a battery shell and a cover cap; the top of the battery case is connected with the cap, and the bottom of the battery case is provided with two sealing valve structures, for example, a round hole is arranged at the bottom of the cylindrical battery case, and for example, a separation net is arranged in the square battery case; the cover cap is provided with two sealing valve structures and an explosion-proof valve, if the cover cap is a round cover cap, a round hole is arranged, and if the cover cap is a square cover cap, the round hole is not arranged.
The sealing valve structure comprises a sealing bolt, a sealing ring, an annular supporting notch and a sealing sheet.
The explosion-proof valve is welded on the cover cap by a pre-scored metal sheet.
The round hole is used for fixing two ends of the cylindrical battery cell pole.
The separation net is fixed at two ends of the wide edge in the square battery shell.
The seal valve structure: the top of the sealing bolt is provided with a special opening and closing inner hexagonal groove (or a polygonal groove), and the lower half part of the sealing bolt is a screw thread; the sealing ring is sleeved outside the sealing bolt in an encircling manner; the annular supporting notch is made of high polymer glue with good toughness and elasticity, the inner wall of the annular supporting notch is a screw thread matched with the sealing bolt when the annular supporting notch is connected, and the annular supporting notch is fixedly arranged at the bottom of the battery case and on the cover cap; the edge of the sealing sheet is provided with a 'thread screw', when the sealing bolt is connected and closed with the bottom of the battery case (and the cap), the sealing sheet is coated with sealing cement in a 'secondary sealing' mode at the 'thread screw' position and then is screwed into a reserved groove at the top of the sealing bolt, and finally the remaining groove at the top of the sealing sheet is filled with the sealing cement.
An explosion-proof valve: the cover cap is fixedly arranged on the cover cap, and the cover cap is opened when the internal pressure or temperature of the battery reaches a preset standard due to excessive gas accumulation inside the battery so as to discharge the gas and heat inside the battery and prevent the battery from deforming and bursting due to the influence of the pressure and the temperature. The preset pressure relief range of the explosion-proof valve is 1-10 Mpa.
Cylindrical battery core pole: is a hollow pipe, and the pipe wall is in a through honeycomb hole shape.
Inner separation net of square battery shell: a proper amount of space is reserved between the separation net and the inner wall of the battery shell, and the surface of the separation net is in a transparent honeycomb hole shape.
Through the function of the sealing valve structure, gas and old electrolyte generated by electrolyte consumption inside the lithium ion battery are discharged timely, a cleaning solvent is injected into the battery, residual electrolyte lithium salt inside the battery and on a battery pole piece interface is cleaned and then dried in vacuum, and finally new electrolyte is injected into the battery, the opening is formed, a sealing bolt and a sealing sheet accompanied by sealing cement are sealed and separated in volume, so that the restoration of the lithium ion battery pole piece interface and the restoration of the initial capacitance of the lithium ion battery are realized, the cycle life of the battery is prolonged by doubling, and the safety and stability of the battery in the using process are ensured.
A lithium ion battery is provided, and the battery shell of the lithium ion battery is the battery shell.
The utility model discloses possess following beneficial effect:
1. by selecting the special opening and closing internal hexagonal groove (or polygonal groove) arranged at the top of the sealing bolt and the lower half part of the sealing bolt as the screw thread, the safety accident caused by abnormal opening of the sealing bolt due to improper operation of the lithium battery in the use and maintenance process can be effectively prevented, so that the operation safety of the lithium battery in the use and maintenance process is ensured; the problem that the sealing bolt is easy to loosen in the traditional interference tight fit connection mode can be effectively prevented; and meanwhile, the removability of the sealing bolt is more convenient for the maintenance operation of the battery.
2. The sealing ring and the annular supporting notch are selected to match with the sealing bolt, so that the sealing bolt is more favorably connected and closed with the bottom (and the cover cap) of the battery case through the annular supporting notch, and the sealing effect inside the battery is achieved;
and the mode that the edge of the sealing sheet is selected as a screw thread and simultaneously carries out secondary sealing along with the sealing cement is adopted, so that the sealing effect in the battery can be enhanced after the sealing valve structure is closed.
3. The cylindrical battery not only fully utilizes the effective space in the battery to store more electrolyte to contribute to prolonging the service life of the battery by selecting the hollow and transparent honeycomb-hole shape of the battery core pole; the fluidity of the electrolyte in the battery and the wettability of the electrolyte to the pole piece and the diaphragm are effectively improved; and also facilitates the removal of gases and liquids during maintenance of the cell.
4. The square battery shell reserves a proper amount of space by selecting the honeycomb cellular separation net arranged in the square battery shell, so that the square battery shell is more favorable for storing more electrolyte and contributes to prolonging the service life of the battery; the fluidity of the electrolyte in the battery and the wettability of the electrolyte to the pole piece and the diaphragm are effectively improved; and also facilitates the removal of gases and liquids during maintenance of the cell.
5. The restoration of the pole piece interface in the lithium ion battery and the restoration of the initial capacitance of the lithium ion battery are realized by selecting the function of the sealing valve structure, so that the cycle life of the battery can be doubled and prolonged, and the safety and stability of the battery in the use process are ensured; the replacement frequency of the waste batteries is greatly reduced, and the resource waste is reduced; meanwhile, the battery is simple in structure, convenient and fast to manufacture and maintain and low in cost.
Drawings
Fig. 1 is a top view of a cylindrical lithium ion battery.
Fig. 2 is a schematic diagram of the internal structure of a cylindrical lithium ion battery.
Fig. 3 is a bottom view of the inside of the cylindrical lithium ion battery.
Fig. 4 is a top view of a square lithium ion battery.
Fig. 5 is a schematic diagram (1) of the internal structure of the square lithium ion battery.
Fig. 6 is a bottom view of the inside of the rectangular lithium ion battery.
Fig. 7 is a schematic diagram (2) of the internal structure of the square lithium ion battery.
Fig. 8 is a schematic view of the sealing valve structure.
Fig. 9 is an exploded schematic view of a sealing valve structure.
In the figure, a battery case 1, a cover cap 2, a sealing valve structure 3, a sealing bolt 3-1, a sealing ring 3-2, an annular supporting notch 3-3, a sealing sheet 3-4, an anti-explosion valve 4, a cell pole column 5 and a separation net 6 are arranged in the battery case 1.
Detailed Description
For a battery case for a lithium ion battery that can be maintained and repaired, the capacity of both cylindrical and prismatic batteries drops to 80% after 2 ten thousand cycles when they are first used.
Example 1
As shown in fig. 1-3,8 and 9, a cylindrical lithium ion battery has a battery shell composed of a battery case 1 and a cap 2, wherein the cap 2 is connected to the top of the battery case 1; the bottom of the battery shell 1 and the cap 2 are respectively provided with two sealing valve structures 3, and the cap 2 is also provided with an explosion-proof valve 4; the sealing valve structure 3 comprises a sealing bolt 3-1, a sealing ring 3-2, an annular supporting notch 3-3 and a sealing sheet 3-4; the battery shell 1 and the cap 2 are provided with openings, the annular supporting notch 3-3 is arranged in the openings and fixedly connected with the battery shell 1 or the cap 2, the sealing bolt 3-1 is arranged in the annular supporting notch 3-3 and is in threaded connection with the annular supporting notch 3-1, the sealing ring 3-2 is arranged between the sealing bolt 3-1 and the annular supporting notch 3-3 and is in sealed connection with the sealing bolt 3-1 and the annular supporting notch 3-3, the sealing piece 3-4 is arranged on the sealing bolt 3-1 and is in threaded connection with the opening, sealing cement is smeared on the periphery of the sealing piece 3-4, and the sealing piece 3-4 is filled with the sealing cement for sealing; the explosion-proof valve 4 is a metal sheet with a prefabricated nick; the cap 2 is provided with an opening, and the explosion-proof valve 4 is welded on the cap 2 and covers the opening; the battery case 1 is cylindrical, the cover cap 2 is circular, and round holes are correspondingly formed in the battery case 1 and the cover cap 2; the battery shell also comprises a cylindrical battery cell pole 5, and two ends of the battery cell pole 5 respectively extend into round holes in the battery shell 1 and the cap 2 and are fixedly connected with the battery shell 1 and the cap 2; the battery core pole 5 is a hollow tube, and the tube wall is in a transparent honeycomb hole shape.
Example 2
As shown in fig. 4-9, on the basis of embodiment 1, the square lithium ion battery has a square battery case 1 and a square cap, and the battery case further includes a separation net 6, wherein the separation net 6 is fixedly connected to two ends of a wide side of the battery case 1; a space is reserved between the separation net 6 and the inner wall of the battery shell 1, and the surface of the separation net 6 is in a through honeycomb hole shape.
The whole process of the lithium ion battery maintenance is as follows:
And 2, closing the two sealing bolt holes at the bottom of the battery case, injecting 20ml of high-purity DMC solvent into the battery from one of the sealing bolt holes on the cap in a vacuum adsorption mode, and then closing the two sealing bolt holes on the cap. The cells were stored in an environment at 45 ℃ for 6 hours.
And 3, repeating the steps 1 and 2 for 3 times, dissolving and cleaning residual electrolyte lithium salt in the battery by using the DMC solvent, and repairing the battery pole piece interface.
And 4, completely opening the sealing bolts at the bottom of the battery case and on the cover cap, putting the battery into a vacuum baking oven, baking for 4 hours in a vacuum environment at the temperature of 80 ℃, and fully removing the DMC solvent in the battery. When the battery is taken out from the vacuum baking box, the sealing bolt holes in the bottom of the battery case and the cover cap are all closed by using sealing bolts so as to prevent moisture in the external air from entering the battery.
And 5, opening two sealing bolts on the cap in the glove box, injecting fresh electrolyte into the battery in a vacuum adsorption mode, performing conventional manufacturing steps of the battery, opening formation on the battery, sealing the sealing bolts and a sealing sheet accompanied by sealing clay, and performing capacity grading to obtain the lithium ion battery with repaired performance, wherein the electric capacity of the battery is recovered to more than 95% of the initial electric capacity through testing.
The above description only represents an embodiment of the present invention, and the description thereof is in detail rather than in the specific details, which should not be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the concept of the present invention, several variations and modifications can be made to the battery housing for a maintainable and repairable lithium ion battery, which all fall within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.
Claims (7)
1. A battery shell for a lithium ion battery capable of being maintained and repaired consists of a battery shell and a cover cap, wherein the cover cap is connected to the top of the battery shell; it is characterized in that; the bottom of the battery shell and the cap are respectively provided with two sealing valve structures, and the cap is also provided with an explosion-proof valve;
the sealing valve structure comprises a sealing bolt, a sealing ring, an annular supporting notch and a sealing sheet; the battery shell and the cap are provided with openings, the annular supporting notch is arranged in the openings and is fixedly connected with the battery shell or the cap, the sealing bolt is arranged in the annular supporting notch and is in threaded connection with the annular supporting notch, the sealing ring is arranged between the sealing bolt and the annular supporting notch and is used for sealing and connecting the sealing bolt and the annular supporting notch, and the sealing piece is arranged on the sealing bolt and is in threaded connection with the openings;
the explosion-proof valve is a metal sheet with a prefabricated nick; the cover cap is provided with an opening, and the explosion-proof valve is welded on the cover cap and covers the opening.
2. The battery shell for the lithium ion battery capable of being maintained and repaired according to claim 1, wherein the battery shell is cylindrical, the cap is circular, and round holes are correspondingly formed in the battery shell and the cap; the battery shell further comprises a cylindrical battery cell pole, and two ends of the battery cell pole respectively extend into round holes in the battery shell and the cap and are fixedly connected with the battery shell and the cap.
3. The battery shell for the lithium ion battery capable of being maintained and repaired according to claim 1, wherein the battery shell is uniform and square, and the battery shell further comprises a separation net which is fixedly connected with two ends of the wide side of the battery shell.
4. The battery shell for the lithium ion battery capable of being maintained and repaired as set forth in claim 1, wherein the sealing sheet is coated with sealing cement on the periphery, and the sealing sheet is filled with the sealing cement and sealed.
5. The battery shell of claim 2, wherein the cell terminals are hollow tubes and the walls of the tubes are open honeycomb-shaped.
6. The battery shell for the lithium ion battery capable of being maintained and repaired as claimed in claim 3, wherein a space is reserved between the separation net and the inner wall of the battery shell, and the surface of the separation net is in a shape of a through honeycomb hole.
7. A lithium ion battery, characterized in that the battery shell of the lithium ion battery is the battery shell of any one of claims 1 to 6.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020702486.4U CN212517284U (en) | 2020-04-30 | 2020-04-30 | Battery housing for lithium ion battery capable of being maintained and repaired and lithium ion battery thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020702486.4U CN212517284U (en) | 2020-04-30 | 2020-04-30 | Battery housing for lithium ion battery capable of being maintained and repaired and lithium ion battery thereof |
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| Publication Number | Publication Date |
|---|---|
| CN212517284U true CN212517284U (en) | 2021-02-09 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202020702486.4U Active CN212517284U (en) | 2020-04-30 | 2020-04-30 | Battery housing for lithium ion battery capable of being maintained and repaired and lithium ion battery thereof |
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| CN (1) | CN212517284U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111509300A (en) * | 2020-04-30 | 2020-08-07 | 隆能科技(南通)有限公司 | Lithium ion battery capable of maintaining and repairing performance and maintenance method thereof |
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2020
- 2020-04-30 CN CN202020702486.4U patent/CN212517284U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111509300A (en) * | 2020-04-30 | 2020-08-07 | 隆能科技(南通)有限公司 | Lithium ion battery capable of maintaining and repairing performance and maintenance method thereof |
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| TR01 | Transfer of patent right |
Effective date of registration: 20240814 Address after: 236000 No.1 Shaying Road, Zhoupeng Street, Yingquan District, Fuyang City, Anhui Province Patentee after: Fuyang longneng Technology Co.,Ltd. Country or region after: China Address before: 169 Huashi North Road, Chengbei street, Rugao City, Nantong City, Jiangsu Province Patentee before: Longneng Technology (Nantong) Co.,Ltd. Country or region before: China |