CN111883821A - Square lithium ion battery and liquid injection process thereof - Google Patents
Square lithium ion battery and liquid injection process thereof Download PDFInfo
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- CN111883821A CN111883821A CN202010764358.7A CN202010764358A CN111883821A CN 111883821 A CN111883821 A CN 111883821A CN 202010764358 A CN202010764358 A CN 202010764358A CN 111883821 A CN111883821 A CN 111883821A
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- liquid injection
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- ion battery
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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
- H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/058—Construction or manufacture
- H01M10/0587—Construction or manufacture of accumulators having only wound construction elements, i.e. wound positive electrodes, wound negative electrodes and wound separators
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
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- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
- Secondary Cells (AREA)
Abstract
The invention relates to a manufacturing process of a lithium ion battery, in particular to a square lithium ion battery and a liquid injection process thereof. The lithium ion battery liquid injection process comprises the following steps: when the lithium ion battery is injected with liquid, the liquid injection hole on the battery cover plate is vacuumized, and simultaneously, the liquid is injected through the two liquid injection holes near the bottom end of the lithium ion battery. Under the vacuum state, can discharge the inside gas of electricity core smoothly, improve and annotate liquid efficiency, promote the infiltration effect. The liquid is injected through the liquid injection hole at the bottom end, so that the electrolyte can be soaked upwards from the bottom, and the battery roll core is soaked more thoroughly. The electrolyte is injected from two ends simultaneously, and the electrolyte can be dispersed and quickly infiltrated in multiple directions in the battery cell.
Description
Technical Field
The invention relates to the technical field of battery processes, in particular to a square lithium ion battery and a liquid injection process thereof.
Background
With the rapid development of lithium ion batteries in the field of energy storage and the electric automobile industry, higher requirements are put forward in the industry for the performances of the lithium ion batteries, such as energy density, capacity and the like. This makes the core of book tighter and tighter, and electric core inner space reduces, adopts ordinary notes liquid technology if: liquid injection, vacuum pumping, pressurization and standing; the common problems of the processes of vacuum pumping, liquid injection, pressurization and stillness are difficult in liquid injection, low in efficiency and poor in electrolyte infiltration effect. In order to solve the problem, researchers continuously research a battery liquid injection process and liquid injection equipment, but the problems of difficult liquid injection and low liquid injection efficiency of the lithium ion battery cannot be well solved at present.
Disclosure of Invention
The invention aims to: aiming at the defects of the prior art, such as: the problems of difficult liquid injection, low liquid injection efficiency, poor electrolyte infiltration effect and the like are solved by providing the lithium ion battery with multiple liquid injection holes and the liquid injection process.
In order to achieve the purpose, the technical scheme of the invention is as follows:
the square lithium ion battery is characterized by comprising an electric core, an aluminum shell and a cover plate, wherein the aluminum shell and the cover plate are both provided with liquid injection holes.
Preferably, the diameters of liquid injection holes arranged on the aluminum shell and the cover plate are the same, the diameter of the outer circle of the liquid injection hole is 6-8mm, and the diameter of the inner circle is 1-3 mm.
Preferably, the liquid injection hole at the bottom end of the aluminum shell is positioned at two sides of the aluminum shell with narrower width and at the central position which is 0.5-1mm away from the bottom end of the aluminum shell.
Preferably, the aluminum shell liquid injection hole is a threaded liquid injection hole.
A liquid injection process for a square lithium battery is characterized in that,
s1: taking a lithium ion battery which is not injected with liquid into a clamp;
s2: injecting half of electrolyte required by the lithium ion battery into the two side liquid injection tanks respectively;
s3: vacuumizing the interior of the lithium ion battery which is not injected with the electrolyte through a vacuum tube, keeping a certain vacuum degree, and simultaneously pressurizing the electrolyte injection tank through a pressurizing tube, wherein the electrolyte rapidly enters the lithium ion battery which is not injected with the electrolyte;
s4: after all the electrolyte enters the lithium ion battery which is not injected with the electrolyte, continuously vacuumizing the interior of the lithium ion battery through a vacuum tube, and keeping a certain vacuum degree;
s5: and (4) removing the liquid injection tank, completely sealing the liquid injection hole of the aluminum shell by using a threaded sealing nail, then stopping vacuumizing the interior of the lithium ion battery, standing, and finishing liquid injection.
Preferably, the vacuum degree in the steps S3 and S4 is-0.05-0.1 MPa, and the vacuum degree is kept consistent.
Compared with the prior art, the invention has the beneficial effects that: through increasing lithium ion battery and annotating the liquid hole and improving notes liquid technology, when annotating liquid to lithium ion battery, follow the notes liquid hole evacuation on the battery apron, simultaneously, annotate liquid from near two notes liquid holes of bottom. Annotate the liquid through the bottom and annotate the liquid hole, can let electrolyte upwards soak from the bottom, make the battery roll up the core and soak more thoroughly, and under vacuum state, can discharge the inside gas of electric core smoothly. The electrolyte is injected through the electrolyte injection holes at the left end and the right end, so that the electrolyte injection efficiency of the battery can be improved, and the electrolyte can be dispersed in multiple directions in the battery core and can be quickly infiltrated.
Drawings
FIG. 1 is a block diagram of a lithium ion battery and its electrolyte injection process according to the present invention;
FIG. 2 is a side view of the lithium ion battery of the present invention;
fig. 3 is a front structural view of a lithium ion battery of the present invention;
FIG. 4 is a process flow diagram of a lithium ion battery and a liquid injection process thereof according to the present invention;
wherein: 1. the anti-explosion aluminum shell comprises an aluminum shell, 2 parts of a cover plate, 3 parts of a cover plate liquid injection hole, 4 parts of a cover plate pole, 5 parts of an aluminum shell liquid injection hole, 6 parts of electrolyte, 7 parts of an anti-explosion valve, 8 parts of a vacuum tube, 9 parts of a liquid injection tank, 10 parts of a pressure tube.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Example 1
Taking a lithium ion battery (LFP48173166-165Ah) which is not injected with liquid, and placing the lithium ion battery in a clamp, wherein the specification of a liquid injection hole is 8mm at the outer circle and 3mm at the inner circle; injecting 235g of half of electrolyte required by the lithium ion battery into the liquid injection tanks at the two sides; vacuumizing the lithium ion battery which is not injected with the electrolyte through a vacuum tube, keeping the vacuum degree at-0.1 Mpa, and simultaneously pressurizing the electrolyte injection tank through a pressurizing tube, wherein the electrolyte rapidly enters the lithium ion battery; after the electrolyte completely enters the lithium ion battery, continuously vacuumizing the interior of the lithium ion battery through a vacuum tube, and keeping the vacuum degree at-0.1 Mpa; and after the liquid injection is finished, removing the liquid injection tank, completely sealing the liquid injection hole of the aluminum shell by using a threaded sealing nail, then stopping vacuumizing the interior of the lithium ion battery, standing, finishing the liquid injection and calculating the liquid injection time.
Example 2
Placing an unliquefied lithium ion battery (LFP48173166-165Ah) in a clamp, wherein the specification of a liquid injection hole is 8mm at the outer circle and 3mm at the inner circle; injecting 235g of half of electrolyte required by the lithium ion battery into the liquid injection tanks at the two sides; vacuumizing the lithium ion battery which is not injected with the electrolyte through a vacuum tube, keeping the vacuum degree at-0.05 Mpa, and simultaneously pressurizing the electrolyte injection tank through a pressurizing tube, wherein the electrolyte rapidly enters the lithium ion battery; after the electrolyte completely enters the lithium ion battery, continuously vacuumizing the interior of the lithium ion battery through a vacuum tube, and keeping the vacuum degree at-0.05 Mpa; and after the liquid injection is finished, removing the liquid injection tank, completely sealing the liquid injection hole of the aluminum shell by using a threaded sealing nail, then stopping vacuumizing the interior of the lithium ion battery, standing, finishing the liquid injection and calculating the liquid injection time.
Example 3
Placing an unliquefied lithium ion battery (LFP48173166-165Ah) in a clamp, wherein the specification of a liquid injection hole is 6mm at the outer circle and 1mm at the inner circle; injecting 235g of half of electrolyte required by the lithium ion battery into the liquid injection tanks at the two sides; vacuumizing the lithium ion battery which is not injected with the electrolyte through a vacuum tube, keeping the vacuum degree at-0.1 Mpa, and simultaneously pressurizing the electrolyte injection tank through a pressurizing tube, wherein the electrolyte rapidly enters the lithium ion battery; after the electrolyte completely enters the lithium ion battery, continuously vacuumizing the interior of the lithium ion battery through a vacuum tube, and keeping the vacuum degree at-0.1 Mpa; and after the liquid injection is finished, removing the liquid injection tank, completely sealing the liquid injection hole of the aluminum shell by using a threaded sealing nail, then stopping vacuumizing the interior of the lithium ion battery, standing, finishing the liquid injection and calculating the liquid injection time.
Example 4
Placing an unliquefied lithium ion battery (LFP48173166-165Ah) in a clamp, wherein the specification of a liquid injection hole is 6mm at the outer circle and 1mm at the inner circle; injecting 235g of half of electrolyte required by the lithium ion battery into the liquid injection tanks at the two sides; vacuumizing the lithium ion battery which is not injected with the electrolyte through a vacuum tube, keeping the vacuum degree at-0.05 Mpa, and simultaneously pressurizing the electrolyte injection tank through a pressurizing tube, wherein the electrolyte rapidly enters the lithium ion battery; after the electrolyte completely enters the lithium ion battery, continuously vacuumizing the interior of the lithium ion battery through a vacuum tube, and keeping the vacuum degree at-0.05 Mpa; and after the liquid injection is finished, removing the liquid injection tank, completely sealing the liquid injection hole of the aluminum shell by using a threaded sealing nail, then stopping vacuumizing the interior of the lithium ion battery, standing, finishing the liquid injection and calculating the liquid injection time.
Comparative example 1
Taking a non-liquid-injection lithium ion battery (LFP48173166-165Ah) with an aluminum shell without a liquid injection hole, wherein the specification of the liquid injection hole of a cover plate is 8mm at the outer circle and 3mm at the inner circle; vacuumizing the lithium ion battery which is not injected with liquid through a vacuum tube, wherein the vacuum degree is-0.1 Mpa, and then stopping vacuumizing; 470g of electrolyte required by the lithium ion battery is injected into the liquid injection tank, the liquid injection tank is pressurized through a pressurizing pipe, and the electrolyte enters the lithium ion battery; standing, finishing liquid injection and calculating the liquid injection time.
Comparative example 2
Taking a non-liquid-injection lithium ion battery (LFP48173166-165Ah) with an aluminum shell without a liquid injection hole, wherein the specification of the liquid injection hole of a cover plate is 8mm at the outer circle and 3mm at the inner circle; vacuumizing the lithium ion battery which is not injected with liquid through a vacuum tube, wherein the vacuum degree is-0.05 Mpa, and then stopping vacuumizing; 470g of electrolyte required by the lithium ion battery is injected into the liquid injection tank, the liquid injection tank is pressurized through a pressurizing pipe, and the electrolyte enters the lithium ion battery; standing, finishing liquid injection and calculating the liquid injection time.
Comparative example 3
Taking a non-liquid-injection lithium ion battery (LFP48173166-165Ah) with an aluminum shell without a liquid injection hole, wherein the specification of the liquid injection hole of a cover plate is 6mm on the outer circle and 1mm on the inner circle; vacuumizing the lithium ion battery which is not injected with liquid through a vacuum tube, wherein the vacuum degree is-0.1 Mpa, and then stopping vacuumizing; 470g of electrolyte required by the lithium ion battery is injected into the liquid injection tank, the liquid injection tank is pressurized through a pressurizing pipe, and the electrolyte enters the lithium ion battery; standing, finishing liquid injection and calculating the liquid injection time.
Comparative example 4
Taking a non-liquid-injection lithium ion battery (LFP48173166-165Ah) with an aluminum shell without a liquid injection hole, wherein the specification of the liquid injection hole of a cover plate is 6mm on the outer circle and 1mm on the inner circle; vacuumizing the lithium ion battery which is not injected with liquid through a vacuum tube, wherein the vacuum degree is-0.05 Mpa, and then stopping vacuumizing; 470g of electrolyte required by the lithium ion battery is injected into the liquid injection tank, the liquid injection tank is pressurized through a pressurizing pipe, and the electrolyte enters the lithium ion battery; standing, finishing liquid injection and calculating the liquid injection time.
The injection time timer directly records the whole time from the start of injection to the end of injection.
After the battery cells of the above examples 1 to 4 and comparative examples 1 to 4, which are subjected to liquid injection, are subjected to high-temperature activation, formation, liquid supplementation, sealing and capacity grading to obtain finished battery cells, 0.35C capacity-grading discharge capacity of the finished battery cells is recorded, and normal-temperature cycle performance (1C charge-discharge) is tested to record capacity retention rate, and the results are as follows:
table 1 results of performance testing
In summary, the following steps: according to the square lithium ion battery and the electrolyte injection process thereof, the electrolyte injection time in the embodiment is obviously shortened, and the effect of improving the electrolyte injection efficiency is obvious. After the lithium ion battery finished product battery core is subjected to 0.35C partial volume and normal temperature cycle test (1C charge-discharge), the discharge capacity and the normal temperature cycle capacity retention rate of the lithium ion battery finished product battery core are improved, and the reason for analyzing the capacity is that the infiltration effect of the lithium ion battery finished product battery core is improved after the lithium ion battery finished product battery core is injected with the electrolyte, and the positive effect is achieved on the discharge capacity and the normal temperature cycle capacity retention rate of the lithium ion battery.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (6)
1. The square lithium ion battery is characterized by comprising an electric core, an aluminum shell (1) and a cover plate (2), wherein the aluminum shell (1) and the cover plate (2) are both provided with liquid injection holes.
2. The square lithium battery as claimed in claim 1, wherein the aluminum shell (1) and the cover plate (2) are provided with liquid injection holes with the same diameter, the outer circle diameter of the liquid injection hole is 6-8mm, and the inner circle diameter is 1-3 mm.
3. The lithium prismatic battery as claimed in claim 1, wherein the liquid injection holes (5) at the bottom end of the aluminum shell (1) are located at the two sides of the aluminum shell (1) with narrower width and at the center position 0.5-1mm away from the bottom end of the aluminum shell (1).
4. A lithium prismatic battery according to claim 1, characterized in that said aluminum casing pour hole (5) is a threaded pour hole.
5. The liquid injection process for square lithium battery as claimed in claim 1,
s1: taking a lithium ion battery which is not injected with liquid into a clamp;
s2: injecting half of electrolyte (6) required by the lithium ion battery into the two side injection tanks (9);
s3: vacuumizing the interior of the lithium ion battery which is not injected with the liquid through a vacuum tube (8), keeping a certain vacuum degree, and simultaneously pressurizing the liquid injection tank (9) through a pressurizing tube (10), wherein the electrolyte (6) rapidly enters the lithium ion battery which is not injected with the liquid;
s4: after the electrolyte (6) completely enters the lithium ion battery which is not injected with the electrolyte, the interior of the lithium ion battery is continuously vacuumized through a vacuum tube (8), and a certain vacuum degree is kept;
s5: and (3) removing the liquid injection tank (9), completely sealing the liquid injection hole (5) of the aluminum shell by using a threaded sealing nail, then stopping vacuumizing the interior of the lithium ion battery, standing, and completing liquid injection.
6. The liquid injection process for a square lithium battery as claimed in claim 5, wherein the vacuum degree in the steps S3 and S4 is-0.05 to-0.1 Mpa, and the vacuum degree is kept consistent.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010764358.7A CN111883821A (en) | 2020-08-02 | 2020-08-02 | Square lithium ion battery and liquid injection process thereof |
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| CN202010764358.7A CN111883821A (en) | 2020-08-02 | 2020-08-02 | Square lithium ion battery and liquid injection process thereof |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112688033A (en) * | 2020-12-25 | 2021-04-20 | 惠州亿纬锂能股份有限公司 | Cylindrical battery cell liquid injection device and liquid injection method |
| CN112736376A (en) * | 2021-01-27 | 2021-04-30 | 湖北亿纬动力有限公司 | Liquid injection device and liquid injection method for battery |
| CN114665161A (en) * | 2022-04-19 | 2022-06-24 | 天科新能源有限责任公司 | Preparation process method and structure of lithium ion safety storage battery |
| CN116454358A (en) * | 2023-06-16 | 2023-07-18 | 深圳海辰储能控制技术有限公司 | Energy storage device and electric equipment |
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Application publication date: 20201103 |