CN107546409B - Lithium ion secondary battery - Google Patents
Lithium ion secondary battery Download PDFInfo
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- CN107546409B CN107546409B CN201710798868.4A CN201710798868A CN107546409B CN 107546409 B CN107546409 B CN 107546409B CN 201710798868 A CN201710798868 A CN 201710798868A CN 107546409 B CN107546409 B CN 107546409B
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- liquid
- lithium ion
- secondary battery
- ion secondary
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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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Abstract
A lithium ion secondary battery comprising: the battery comprises a shell, a naked battery cell accommodated in the shell, and a top cover hermetically arranged on the shell; the lithium ion secondary battery is characterized in that a first pole column and a second pole column are arranged on the top cover, an explosion-proof valve and a liquid injection hole are arranged between the first pole column and the second pole column, the lithium ion secondary battery further comprises a liquid equalizing device, and the liquid equalizing device is suspended on the bottom surface of the top cover and is communicated with the liquid injection hole. The lithium ion secondary battery provided by the invention can effectively improve the dispersion degree of the electrolyte, accelerate the diffusion of the electrolyte in a bare cell, effectively shorten the standing and soaking time and greatly improve the production efficiency.
Description
Technical Field
The invention belongs to the field of batteries, and particularly relates to a lithium ion secondary battery.
Background
With the development of global economy, especially the development of automobile industry, people consume more and more traditional energy, the contradiction between energy supply and demand is continuously upgraded, and people urgently hope to develop new clean energy to replace the traditional energy so as to meet the demand of people in daily life and reduce the pollution to the environment. Driven by this demand, lithium ion power batteries are produced.
In the manufacturing process of the lithium ion secondary battery, the naked electric core, the shell and the top cover need to be assembled with each other, and finally, electrolyte is injected. In the prior art, a liquid injection hole is generally formed in a top cover of a lithium ion secondary battery, then electrolyte is injected into the lithium ion secondary battery through the liquid injection hole, then the liquid injection hole is sealed, and subsequent steps such as standing, soaking, activating and the like are performed. In the prior art, after the electrolyte is injected into the lithium ion secondary battery, the electrolyte is generally deposited at the bottom of the lithium ion secondary battery under the action of gravity, and then the electrolyte is diffused and infiltrates the naked electric core under the capillary action of the naked electric core.
Disclosure of Invention
Aiming at the technical problems in the background art, the invention provides a lithium ion secondary battery which can effectively improve the dispersion degree of electrolyte, accelerate the diffusion of the electrolyte in a bare cell, effectively shorten the standing and soaking time and greatly improve the production efficiency.
A lithium ion secondary battery comprising: the battery comprises a shell, a naked battery cell accommodated in the shell, and a top cover hermetically arranged on the shell; the lithium ion secondary battery is characterized in that a first pole column and a second pole column are arranged on the top cover, an explosion-proof valve and a liquid injection hole are arranged between the first pole column and the second pole column, the lithium ion secondary battery further comprises a liquid equalizing device, and the liquid equalizing device is suspended on the bottom surface of the top cover and is communicated with the liquid injection hole. In the prior art, after electrolyte enters the lithium ion secondary battery from the electrolyte injection hole, a small amount of electrolyte can be randomly scattered into a bare cell, a large amount of electrolyte can be deposited at the bottom of the lithium ion secondary battery due to the self gravity action, and then slowly diffused to the whole bare cell through the capillary action, and the whole process is slow and long.
As an improvement of the lithium ion secondary battery, the liquid homogenizing device includes a vertical tube and a liquid homogenizing tube communicated with the vertical tube, the liquid homogenizing tube is suspended above the bare cell, and an extending direction of the liquid homogenizing tube is parallel to a width direction of the bare cell. Through setting up the liquid equalizing pipe parallel with naked electric core width direction, directly set up liquid equalizing pipe directly over naked electric core, pour into the back into when electrolyte from annotating the liquid hole, electrolyte can follow liquid equalizing pipe extending direction and evenly spill to naked electric core on, make electrolyte can take place the diffusion simultaneously on a plurality of sites of naked electric core, effectively shorten the time that lithium ion secondary battery stew and soaks.
As the improvement of the lithium ion secondary battery, the liquid equalizing device also comprises a drainage tube which is obliquely arranged, wherein one end of the drainage tube, which is closer to the bottom surface of the top cover, is communicated with the vertical tube, and the other end of the drainage tube, which is farther from the bottom surface of the top cover, is communicated with the flow equalizing tube. Through setting up the drainage tube into the tilt state, can prevent that electrolyte from remaining in the drainage tube, causing the waste of electrolyte.
As an improvement of the lithium ion secondary battery, the bottom of the liquid homogenizing pipe is provided with a plurality of liquid homogenizing holes. Through setting up the liquid hole of equaling, can make electrolyte obtain abundant dispersion in the liquid equalizing pipe, further promote the infiltration speed of electrolyte.
As an improvement of a lithium ion secondary battery according to the present invention, the diameter of the liquid-uniforming hole is smaller than the diameter of the positive-electrode and/or negative-electrode active material particles. When the lithium ion secondary battery is misused or the service time is too long, the internal electrolyte is decomposed, and the air pressure is increased, the gas in the lithium ion secondary battery needs to be discharged through the liquid injection hole, and meanwhile, the electrolyte is supplemented into the lithium ion secondary battery through the liquid injection hole, and in the exhaust process, the positive electrode active material particles or the negative electrode active material particles in the bare cell can be sprayed out along with the air flow, and the combustion can be generated when encountering the air.
As an improvement of the lithium ion secondary battery, the connection point of the drainage tube and the liquid homogenizing pipe is located at the midpoint of the liquid homogenizing pipe. The drainage tube is communicated with the midpoint of the liquid equalizing tube, so that the electrolyte can be better dispersed in the liquid equalizing tube.
As an improvement of the lithium ion secondary battery of the present invention, the liquid injection hole is a stepped hole, at least two buckles are arranged at intervals along the circumferential direction of the port at one end of the standpipe fixed with the liquid injection hole, the buckles can be bent and deformed along the horizontal direction, and the buckles are assembled with the stepped hole correspondingly. The liquid equalizing device adopts the structure and is assembled with the liquid injection hole, so that the liquid equalizing device is convenient to install, and meanwhile, the buckle can be bent along the horizontal direction, so that interference assembly is formed between the buckle and a pin for sealing the liquid injection hole, and the sealing performance of the lithium ion secondary battery is ensured.
As an improvement of the lithium ion secondary battery of the present invention, the liquid equalizing pipe is located right below the explosion-proof valve. The liquid equalizing pipe is arranged below the explosion-proof valve of the lithium ion secondary battery, when the lithium ion secondary battery is excessively abused to cause the internal air pressure of the lithium ion secondary battery to sharply rise and trigger the explosion-proof valve, the liquid equalizing pipe can generate a certain buffering disturbance effect on the ejected air flow, and when the positive electrode or negative electrode active material particles ejected along with the air flow touch the liquid equalizing pipe, the positive electrode or negative electrode active material particles ejected to the outside of the lithium ion secondary battery can be returned to the inside of the lithium ion secondary battery due to the rebound effect, the quantity of the positive electrode or negative electrode active material particles ejected to the outside of the lithium ion secondary battery is effectively reduced, and the risk.
Compared with the prior art, the invention has the beneficial effects that:
1. in the prior art, after electrolyte enters the lithium ion secondary battery from the electrolyte injection hole, a small amount of electrolyte can be randomly scattered into a bare cell, a large amount of electrolyte can be deposited at the bottom of the lithium ion secondary battery due to the self gravity action, and then slowly diffused to the whole bare cell through the capillary action, and the whole process is slow and long.
2. When the lithium ion secondary battery is misused or the service time is too long, the internal electrolyte is decomposed, and the air pressure is increased, the gas in the lithium ion secondary battery needs to be discharged through the liquid injection hole, and meanwhile, the electrolyte is supplemented into the lithium ion secondary battery through the liquid injection hole, and in the exhaust process, the positive electrode active material particles or the negative electrode active material particles in the bare cell can be sprayed out along with the air flow, and the combustion can be generated when encountering the air.
Drawings
Fig. 1 is an exploded perspective view of a lithium ion secondary battery according to the present invention.
Fig. 2 is a perspective view of a top cap of a lithium ion secondary battery according to the present invention.
Fig. 3 is a sectional view of a top cap of a lithium ion secondary battery according to the present invention.
Fig. 4 is a partially enlarged view of a liquid injection hole of a lithium ion secondary battery according to the present invention.
Fig. 5 is a perspective view of a liquid uniforming device of a lithium ion secondary battery according to the present invention.
Fig. 6 is a partially enlarged view of a standpipe of a liquid homogenizing device of a lithium ion secondary battery according to the present invention.
1-top cover, 11-first pole, 12-second pole, 13-liquid homogenizing device, 14-injection molding piece, 15-liquid injection hole, 16-explosion-proof valve, 17-insulating block, 18-conductive block, 19-insulating washer, 131-buckle, 132-vertical pipe, 133-drainage pipe, 134-liquid homogenizing pipe and 135-liquid homogenizing hole;
2-a naked battery cell, 21-a first tab and 22-a second tab;
3-a shell.
Detailed Description
In order to make the objects, technical solutions and advantageous technical effects of the present invention clearer, the present invention is described in further detail below with reference to the accompanying drawings and the detailed description. It should be understood that the detailed description and specific examples, while indicating the preferred embodiment of the invention, are intended for purposes of illustration only and are not intended to limit the scope of the invention.
As shown in fig. 1-2, a lithium ion secondary battery includes: the battery pack comprises a shell 3, a naked battery cell 2 accommodated in the shell 3, and a top cover 1 which is hermetically arranged on the shell 3 and is respectively electrically connected with a first tab 21 and a second tab 22 of the naked battery cell 2; be provided with first utmost point post 11 on the top cap 1, second utmost point post 12 to and be located the explosion-proof valve 16 between first utmost point post 11 and the second utmost point post 12 and annotate liquid hole 15, wherein, first utmost point post 11 is connected with naked electric core 2's first utmost point ear 21 electricity, and second utmost point post 12 is connected with naked electric core 2's second utmost point ear 22 electricity, lithium ion secondary battery still includes liquid balancing unit 13, liquid balancing unit 13 hangs and locates on top cap 1 bottom surface, and with annotate liquid hole 15 intercommunication. In this embodiment, the first pole post 11 is in insulated connection with the top cover 1, the first pole post 11 is fixedly connected with the top cover 1 through an injection molding part 14, the upper part of the first pole post 11 is in insulated assembly with the top cover 1 through an insulating gasket 19 wrapped on the side wall of the first pole post 11, and an insulating stop 17 is further arranged on the lower part of the first pole post 11, and on one hand, the insulating stop 17 can realize the insulated assembly between the first pole post 11 and the top cover 1, and can prevent the first pole post 11 from shaking; the upper part of the second pole post 12 is fixedly connected with the top cover 1 through an injection molding part 14, and a conductive stop block 18 is arranged between the lower part of the second pole post 12 and the bottom surface of the top cover 1 to prevent the second pole post 12 from shaking left and right; in the prior art, after the electrolyte enters the lithium ion secondary battery from the electrolyte injection hole 15, a small amount of electrolyte can be randomly scattered into the naked battery core 2, a large amount of electrolyte can be deposited at the bottom of the lithium ion secondary battery under the action of self gravity, and then slowly diffused to the whole naked battery core 2 through capillary action, and the whole process is slow and long.
Specifically, in this embodiment, as shown in fig. 1-2 and fig. 5, the liquid equalizing device 13 includes a vertical pipe 132 and a liquid equalizing pipe 134 communicated with the vertical pipe 132, the liquid equalizing pipe 134 is suspended above the bare cell 2, and an extending direction of the liquid equalizing pipe 134 is parallel to a width direction of the bare cell 2. Through setting up the liquid equalizing pipe 134 parallel with 2 width direction of naked electric core, directly set up liquid equalizing pipe 134 directly over naked electric core 2, after electrolyte from annotating liquid hole 15 and pour into, electrolyte can evenly spill on naked electric core 2 along liquid equalizing pipe 134 extending direction, makes electrolyte can take place the diffusion simultaneously on a plurality of sites of naked electric core 2, effectively shortens the time that lithium ion secondary battery stew and soaks.
Preferably, as shown in fig. 2 and 5, the liquid-equalizing device 13 further comprises an inclined draft tube 133, wherein one end of the draft tube 133 closer to the bottom surface of the top cover 1 is communicated with the vertical tube 132, and the other end of the draft tube 133 farther from the bottom surface of the top cover 1 is communicated with the liquid-equalizing tube 134. Preferably, the end of the draft tube 133 farther from the bottom surface of the top cover 1 is communicated with the midpoint of the liquid-equalizing tube 134. The middle point of the drainage tube 133 is communicated with the middle point of the liquid equalizing tube 134, so that the electrolyte can be better dispersed in the liquid equalizing tube 134, and in addition, the drainage tube 133 is set to be in an inclined state, so that the electrolyte can be prevented from being remained in the drainage tube 133, and the waste of the electrolyte is caused.
In particular, as shown in fig. 5, the bottom of the liquid-equalizing pipe 134 is provided with a plurality of liquid-equalizing holes 135. Through setting up the liquid hole 135, can make electrolyte obtain abundant dispersion in the liquid pipe 134 of evening, further promote the infiltration speed of electrolyte. It is to be noted that, in the present embodiment, the diameter of the soaking hole 135 is smaller than the diameter of the positive electrode and/or negative electrode active material particles. When the lithium ion secondary battery is misused or the service time is too long, the internal electrolyte is decomposed, and the air pressure is increased, the gas in the lithium ion secondary battery needs to be discharged through the liquid injection hole 15, meanwhile, the electrolyte is supplemented into the lithium ion secondary battery through the liquid injection hole 15, and in the exhaust process, the positive electrode active material particles or the negative electrode active material particles in the bare cell 2 are ejected along with the air flow, and the combustion can be generated when encountering the air.
Meanwhile, in order to further improve the safety performance of the lithium ion secondary battery, as shown in fig. 2, a liquid equalizing pipe 134 may be disposed right below the explosion-proof valve 16. The liquid equalizing pipe 134 is arranged below the explosion-proof valve 16 of the lithium ion secondary battery, when the lithium ion secondary battery is abused excessively, the air pressure in the lithium ion secondary battery rises sharply and the explosion-proof valve 16 is triggered, the liquid equalizing pipe 134 can generate a certain buffering disturbance effect on the ejected air flow, and when positive electrode or negative electrode active material particles ejected along with the air flow touch the liquid equalizing pipe 134, the positive electrode or negative electrode active material particles can return to the inside of the lithium ion secondary battery again due to the rebound effect, the number of the positive electrode or negative electrode active material particles ejected to the outside of the lithium ion secondary battery is effectively reduced, and the risk of safety accidents is reduced.
In addition, in this embodiment, as shown in fig. 1 to 6, the liquid pouring hole 15 is a stepped hole, at least two buckles 131 are arranged at intervals along the circumferential direction of the port at one end of the stand pipe 132 fixed to the liquid pouring hole 15, the buckles 131 can be bent and deformed along the horizontal direction, and the buckles 131 are correspondingly assembled with the stepped hole. The liquid equalizing device 13 is assembled with the liquid injection hole 15 by adopting the structure, so that the liquid equalizing device 13 is convenient to install, meanwhile, the buckle 131 can be bent along the horizontal direction, the interference assembly with a pin for sealing the liquid injection hole 15 is convenient to form, and the sealing performance of the lithium ion secondary battery is ensured.
Claims (1)
1. A lithium ion secondary battery comprising: the battery comprises a shell, a naked battery cell accommodated in the shell, and a top cover hermetically arranged on the shell; the lithium ion secondary battery is characterized by further comprising a liquid equalizing device, wherein the liquid equalizing device is suspended on the bottom surface of the top cover and is communicated with the liquid injection hole, the liquid equalizing device comprises a vertical pipe and a liquid equalizing pipe communicated with the vertical pipe, the liquid equalizing pipe is suspended above the naked electric core, the extending direction of the liquid equalizing pipe is parallel to the width direction of the naked electric core, the liquid equalizing device further comprises a drainage pipe which is obliquely arranged, one end, close to the bottom surface of the top cover, of the drainage pipe is communicated with the vertical pipe, one end, far away from the bottom surface of the top cover, of the drainage pipe is communicated with the liquid equalizing pipe, the liquid injection hole is a step hole, and at least two buckles are arranged at intervals at the peripheral direction of a port of the vertical pipe and one end, fixed with the liquid injection hole, the buckle can be bent and deformed along the horizontal direction, the buckle is correspondingly assembled with the stepped hole, and the communication point of the drainage tube and the liquid homogenizing tube is positioned at the midpoint of the liquid homogenizing tube; the bottom of the liquid homogenizing pipe is provided with a plurality of liquid homogenizing holes; the liquid equalizing pipe is positioned right below the explosion-proof valve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710798868.4A CN107546409B (en) | 2017-09-07 | 2017-09-07 | Lithium ion secondary battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710798868.4A CN107546409B (en) | 2017-09-07 | 2017-09-07 | Lithium ion secondary battery |
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| Publication Number | Publication Date |
|---|---|
| CN107546409A CN107546409A (en) | 2018-01-05 |
| CN107546409B true CN107546409B (en) | 2021-06-01 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201710798868.4A Expired - Fee Related CN107546409B (en) | 2017-09-07 | 2017-09-07 | Lithium ion secondary battery |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108962610B (en) * | 2018-06-11 | 2023-08-11 | 铜陵泽辉电子有限责任公司 | High leakproofness capacitor cover plate |
| CN212659597U (en) * | 2020-08-21 | 2021-03-05 | 常州瑞德丰精密技术有限公司 | Secondary battery and battery pack |
| CN113991265A (en) * | 2021-10-29 | 2022-01-28 | 蜂巢能源科技有限公司 | Lithium ion battery and preparation method thereof |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5958761A (en) * | 1982-09-28 | 1984-04-04 | Hitachi Maxell Ltd | Manufacture of sealed battery |
| KR100601513B1 (en) * | 2004-10-01 | 2006-07-19 | 삼성에스디아이 주식회사 | Lithium secondary battery |
| CN201809457U (en) * | 2010-08-04 | 2011-04-27 | 肇庆市飞南金属有限公司 | Electrolysis bath structure feeding electrolyte uniformly |
| CN203377331U (en) * | 2013-07-29 | 2014-01-01 | 宁波慧通新能源科技有限公司 | Storage battery with splitter plate |
| CN204067458U (en) * | 2014-08-06 | 2014-12-31 | 浙江宝仕电源有限公司 | A kind of environment-friendly type lead acid accumulator |
| CN204596850U (en) * | 2015-03-31 | 2015-08-26 | 比亚迪股份有限公司 | A kind of cover plate assembly and lithium ion battery |
| CN205609693U (en) * | 2016-05-13 | 2016-09-28 | 宁德时代新能源科技股份有限公司 | Electrochemistry energy memory |
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2017
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| CN107546409A (en) | 2018-01-05 |
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