CN102788927B - Detecting method for accelerating short circuit failure of square lithium battery cell - Google Patents
Detecting method for accelerating short circuit failure of square lithium battery cell Download PDFInfo
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- CN102788927B CN102788927B CN201210302408.5A CN201210302408A CN102788927B CN 102788927 B CN102788927 B CN 102788927B CN 201210302408 A CN201210302408 A CN 201210302408A CN 102788927 B CN102788927 B CN 102788927B
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Abstract
The invention discloses a detecting method for accelerating short circuit failure of a square lithium battery cell. The detecting method can be used for finding out and eliminating phenomena of open circuit and micro open circuit in advance, so that product quality is ensured and improved, production efficiency is increased, and the condition of reducing production cost of the lithium ion cell is facilitated. The method comprises the following steps: (1) sending the lithium battery cell after coil inserting by a laminated machine into a high-temperature electric oven for baking the lithium battery cell, so that longitudinal contractibility rate of a diaphragm of the lithium battery cell reaches 3-4%; (2) sending the lithium battery cell into a low-temperature oven for cooling, so as to enable the diaphragm to recover to a normal state; (3) sending the lithium battery cell out of the low-temperature oven, and keeping the lithium battery cell in a normal-temperature dehumidifying state, wherein dehumidifying dew point is in a range from 30 DEG C below zero to 40 DEG C below zero; and (4) testing whether the lithium battery cell is short-circuited by a pressure short circuit tester.
Description
Technical field
The present invention relates to lithium ion battery, particularly a kind of square lithium electricity battery core is accelerated short-circuit failure detection method.
Background technology
Lithium ion battery has high-energy-density, environmentally friendly, meets just a kind of mechanism of new electrochemical power sources of social development and scientific progress, both at home and abroad all at accelerate development and production lithium ion battery.But in process of production, battery core short circuit problem affects the raising of product yields, and the yields even having only has 60-70%, and short circuit ratio reaches 30-40% always, have a strong impact on product quality and improve.The main cause that affects battery core short circuit is the burr of the die-cut generation of pole piece periphery, dust and the metal particle that air purification produces not, when lamination, PE barrier film wraps up (battery core reaches 100 layers of pole plate and barrier film) after pole piece, the hidden danger that has unavoidably one or more layers burr of not disposed once in a while by pole piece periphery or pierced through by the middle molecule of infiltrating,, in production process different phase, all can there is breaking phenomena in expansion, effect of contraction along with later stage assembling extruding or barrier film are heated, catch a cold.Therefore at present, manufacturer after the baking oven baking in lamination later stage, assembling in groups, 7-8 link will be carried out repeatedly battery short circuit detection after baking and after body seal, fluid injection etc. in groups, the battery core Baking out time is grown (approaching 100 hours 2 times), operation is various, having a strong impact on production efficiency improves, and after product export, also there is successively short circuit phenomenon, rejection rate is high, is unfavorable for reducing the production cost of lithium ion battery and ensuring the quality of products.
Summary of the invention
Technical matters to be solved by this invention is to provide a kind of square lithium electricity battery core and accelerates short-circuit failure detection method, can find in advance and eliminate battery core opens circuit and micro-breaking phenomena, to guarantee and to improve the quality of products, enhance productivity, and be conducive to reduce the production cost of lithium ion battery.
The technical solution adopted for the present invention to solve the technical problems is as follows:
Square lithium electricity battery core of the present invention is accelerated short-circuit failure detection method, comprises the steps:
1. travelling belt will be rolled off the production line by laminating machine after lithium electricity battery core send in high-temperature electric baking box and toast, baking temperature is 95-100 ℃, baking time 60 minutes makes its barrier film longitudinal contraction rate reach 3-4%;
2. travelling belt is sent into lithium electricity battery core in cryogenic box and is lowered the temperature, and temperature fall time is 60 minutes, and within first 30 minutes, temperature is controlled at-15 ℃ to-20 ℃, and within latter 30 minutes, temperature is controlled at 15 ℃ to 20 ℃, and its barrier film is returned to normal;
3. travelling belt is sent cryogenic box by lithium electricity battery core, and 20 ℃ of normal temperature are except wet condition, and dehumidifying dew point be-30 to-40 to spend;
4. use the whether short circuit of pressure short circuit tester applied voltage test lithium electricity battery core.
The invention has the beneficial effects as follows, after lithium electricity battery core is rolled off the production line by laminating machine, after its barrier film is processed through high/low-temperature impact and is expanded, shrinks, if there is burr, particulate hidden danger in battery core pole plate, will pierce through barrier film, cause short circuit, then with pressure short circuit tester applied voltage test, just can find that there is the battery core of hidden danger, can find in advance and eliminate battery core and open circuit and micro-breaking phenomena, to guarantee and to improve the quality of products, enhance productivity, and be conducive to reduce the production cost of lithium ion battery.The method investment is little, it is low to consume energy, feasible process, be convenient to produce in enormous quantities and detect.
Accompanying drawing explanation
This instructions comprises as next width accompanying drawing:
Fig. 1 is that the square lithium electricity of the present invention battery core is accelerated the schematic diagram that short-circuit failure detects detection system that system, method is used.
Member shown in figure, equipment and corresponding mark: lithium electricity battery core 1, conveyer 10, high-temperature electric baking box 20, cryogenic box 30, pressure short circuit tester 40.
Embodiment
Below the present invention is further described.
The square lithium electricity of the present invention battery core is accelerated short-circuit failure and is detected system, method, comprises the steps:
1. after being rolled off the production line by laminating machine, lithium electricity battery core is sent in high-temperature electric baking box and is toasted, and makes its barrier film longitudinal contraction rate reach 3-4%, and baking temperature is 95-100 ℃, baking time 60 minutes.
2. lithium electricity battery core is sent in cryogenic box and lowered the temperature, temperature fall time is 60 minutes, and within first 30 minutes, temperature is controlled at-15 ℃ to-20 ℃, and within latter 30 minutes, temperature is controlled at 15 ℃ to 20 ℃, and its barrier film is returned to normal.
3. lithium electricity battery core is sent to cryogenic box, normal-temp .-dehumidifying state, dehumidifying dew point is-30 to-40 degree.
4. with the whether short circuit of pressure short circuit tester test lithium electricity battery core.
Barrier film, after high and low temperature expands, shrinks, if battery core pole plate is jagged, particulate will pierce through barrier film, causes short circuit, then with pressure short circuit tester applied voltage test, just can find that there is the battery core of hidden danger.Do not affecting under battery core technical feature and quality condition, battery core is inserted to acceleration, strengthened in the production of simulation lamination later stage battery core, use procedure, the high and low temperature environment experiencing, under assembling squeezed state, in very short time (3 hours), just can find in advance and eliminate battery core and open circuit and micro-breaking phenomena, to guarantee and to improve the quality of products, enhance productivity, and be conducive to reduce the production cost of lithium ion battery.
Two contact feets with spring of pressure short circuit tester band, can with the positive and negative lug close contact of battery core, tester bottom is and the large surface of battery core surface of contact of the same area, this surface of contact positioned inside has the spring that 5cm to 10cm is high, during test, can apply 4Kg to 6Kg pressure, close contact when guaranteeing test, now jagged pole plate and molecule will pierce through barrier film, cause short circuit by instrument test, pick out.
The detection system that the square lithium electricity of the present invention battery core acceleration short-circuit failure detection system, method is used is comprised of high-temperature electric baking box, cryogenic box, pressure short circuit tester and conveyer four major parts conventionally, after being rolled off the production line by laminating machine, lithium electricity battery core is sent to electric oven, cryogenic box, pressure short circuit tester successively by conveyer, and detection efficiency is high and be convenient to realize produce in enormous quantities and detect.
Claims (2)
1. square lithium electricity battery core is accelerated short-circuit failure detection method, comprises the steps:
1. after being rolled off the production line by laminating machine, lithium electricity battery core is sent in high-temperature electric baking box and is toasted, and baking temperature is 95-100 ℃, and baking time 60 minutes makes its barrier film longitudinal contraction rate reach 3-4%;
2. lithium electricity battery core is sent in cryogenic box and lowered the temperature, temperature fall time is 60 minutes, and within first 30 minutes, temperature is controlled at-15 ℃ to-20 ℃, and within latter 30 minutes, temperature is controlled at 15 ℃ to 20 ℃, and its barrier film is returned to normal;
3. lithium electricity battery core is sent to cryogenic box, normal-temp .-dehumidifying state, dehumidifying dew point is-30 to-40 degree;
4. with the whether short circuit of pressure short circuit tester test lithium electricity battery core.
2. square lithium electricity battery core as claimed in claim 1 is accelerated short-circuit failure detection method, it is characterized in that: described step 4. in, pressure short circuit tester is 4Kg to 6Kg to lithium electricity battery core applied pressure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201210302408.5A CN102788927B (en) | 2012-08-23 | 2012-08-23 | Detecting method for accelerating short circuit failure of square lithium battery cell |
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| CN201210302408.5A CN102788927B (en) | 2012-08-23 | 2012-08-23 | Detecting method for accelerating short circuit failure of square lithium battery cell |
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| CN102788927A CN102788927A (en) | 2012-11-21 |
| CN102788927B true CN102788927B (en) | 2014-11-05 |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103207348B (en) * | 2013-03-22 | 2015-10-28 | 奇瑞新能源汽车技术有限公司 | A kind of high-capacity dynamical lithium-ion battery core high pressure surveys short circuit automatic checkout equipment and detection method thereof |
| CN108196155A (en) * | 2017-12-25 | 2018-06-22 | 桑德集团有限公司 | It is a kind of for detect battery roll core whether short circuit method |
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Effective date of registration: 20210521 Address after: 610000 Industrial Development Zone of Southwest Airport Economic Development Zone, Shuangliu District, Chengdu City, Sichuan Province Patentee after: HEIDONG TECHNOLOGY Co.,Ltd. Address before: No.188-114 Qingyang Avenue, Chengdu, Sichuan 610031 Patentee before: SICHUAN XINTANG NEW ENERGY SCIENCE & TECHNOLOGY Co.,Ltd. |
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