CN101212033B - Secondary battery explosion-proof shell and battery - Google Patents
Secondary battery explosion-proof shell and battery Download PDFInfo
- Publication number
- CN101212033B CN101212033B CN2006101618007A CN200610161800A CN101212033B CN 101212033 B CN101212033 B CN 101212033B CN 2006101618007 A CN2006101618007 A CN 2006101618007A CN 200610161800 A CN200610161800 A CN 200610161800A CN 101212033 B CN101212033 B CN 101212033B
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- groove
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- 230000004888 barrier function Effects 0.000 claims description 6
- 239000008151 electrolyte solution Substances 0.000 claims description 6
- 230000015572 biosynthetic process Effects 0.000 claims description 3
- 238000009826 distribution Methods 0.000 claims description 3
- 238000004880 explosion Methods 0.000 abstract description 13
- 239000007789 gas Substances 0.000 description 17
- 239000002360 explosive Substances 0.000 description 13
- 238000002360 preparation method Methods 0.000 description 13
- 230000000694 effects Effects 0.000 description 8
- 238000010586 diagram Methods 0.000 description 7
- 238000004080 punching Methods 0.000 description 7
- 238000000034 method Methods 0.000 description 6
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 2
- 239000002585 base Substances 0.000 description 2
- 230000000903 blocking effect Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 229910052744 lithium Inorganic materials 0.000 description 2
- 230000032683 aging Effects 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 239000003792 electrolyte Substances 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 238000010926 purge Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
Images
Classifications
-
- 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
Landscapes
- Gas Exhaust Devices For Batteries (AREA)
Abstract
The invention provides an explosion proof shell of a secondary battery, wherein the shell at least comprises a part 1 with thickness less than the shell thickness and a groove 2 arranged on the part 1 with thickness less than the shell thickness. When internal pressure of the battery increases tremendously to burst limit of a safety explosion proof film, the part 1 with thickness less than the shell thickness is broken through by the internal pressure of the battery and the accumulative gas is discharged instantly. The battery has a good safety performance.
Description
Technical field
The invention relates to a kind of battery container, more particularly, is about a kind of secondary cell explosion-proof casing and battery.
Background technology
In order to make secondary cell in use have good security performance, the safety anti-explosive device assembly is set on battery case generally.When the interior pressure of battery hour, the safety anti-explosive device assembly can play the effect of seal vents; When battery owing to unexpected reason, when causing inner pressure of battery sharply to increase as battery short circuit, the safety anti-explosive device assembly can in time be opened, and drains gas and in time reduces inner pressure of battery.
As shown in Figure 1 to Figure 3, this secondary cell with safety anti-explosive device assembly comprises battery body 7 and safety anti-explosive device assembly 8, battery body 7 comprises shell 9 and is arranged at positive and negative plate 10,11 in the shell 9, has barrier film 12 between this positive and negative plate 10,11.Safety anti-explosive device assembly 8 by last cap 13, the bottom 14 of tool venthole and be arranged at cap 13 and bottom 14 between explosion-proof ball 15 form.This secondary cell utilizes that the explosion-proof ball alkali resistance is good, ageing-resistant performance reaches characteristics such as high resiliency well, makes battery that excellent sealing performance and useful life be arranged.But, this secondary cell has following shortcoming: when the interior pressure of battery sharply increases,, drains explosion-proof ball 15 gas though in time shrinking, but because explosion-proof ball 15 occupies bigger locus in whole safety anti-explosive device assembly, battery inner high voltage gas purging there is certain obstruction, make the gases at high pressure can't free unobstructed discharge, force the head of battery to bear bigger pressure, light then the phenomenon that groove position 16 stretches occurs, heavy then will cause battery explosion, this shows that the security performance of this class formation battery is not good.
CN2689470Y discloses a kind of column type lithium cell anti-explosion safety housing, this battery container has been provided with the structure of explosion-proof relief effect, it is characterized in that: the described structure that plays the explosion-proof relief effect comprises by machinery carve to press one the explosion proof node of being no less than that forms, and is positioned at the outer bottom of housing.The described structure that plays the explosion-proof relief effect also comprises an annular explosion-proof relief groove, is positioned at the housing outer bottom, and explosion proof node is in the base projections of annular explosion-proof relief groove.This column type lithium cell housing outer bottom is provided with explosion proof node, this explosion proof node and housing bottom annular groove are to inside battery direction projection, and exceeded the battery container bottom interior surface, because explosion proof node has exceeded the battery container bottom interior surface, be easy to be caused and break, also may push up bad pole piece positive and negative electrode because of the explosion proof node of projection and cause battery short circuit by Battery Pole Core extruding.In addition, the explosion proof node width that is arranged on the annular groove is limited, when explosion proof node during by gas breakdown pressure release area less relatively, generally can produce a large amount of gases and impurity in the battery short circuit process, fall material etc. as diaphragm paper, positive and negative electrode pole piece,, be easy to cause danger if relief hole is blocked, therefore, the security performance of the battery of this type of shell structure is still undesirable.
Summary of the invention
The objective of the invention is to overcome the defective that has secondary cell explosion-proof casing poor safety performance now a kind of secondary cell explosion-proof casing and secondary cell and their preparation method with good safety energy is provided.
The invention provides a kind of secondary cell explosion-proof casing, wherein, comprise the part 1 of a thickness on the described housing at least, also be provided with groove 2 on the part 1 of this thickness less than thickness of shell less than thickness of shell.
The present invention also provides a kind of secondary cell, this battery comprises pole piece, nonaqueous electrolytic solution and battery container, and described pole piece comprises positive pole, negative pole and barrier film, and described pole piece and nonaqueous electrolytic solution are sealed in the battery container, wherein, described battery container is an explosion-proof casing provided by the invention.
The safety anti-explosive device of secondary cell explosion-proof casing of the present invention is for directly being formed at least one thickness on the battery container less than the part 1 of thickness of shell, this thickness can play the effect of rupture pressure disc less than the part 1 of thickness of shell, and also be provided with groove 2 on the part 1 of this thickness less than thickness of shell, when inner pressure of battery sharply increases, when reaching the compressive yield strength of safety anti-explosive film, thickness is broken through by inner pressure of battery less than the part 1 of thickness of shell, moment is discharged the gas that gathers, according to of the present invention one preferred embodiment, this safety anti-explosive device is arranged on housing bottom, hinder the problem of inside battery gas quick drain like this with regard to not occurring blocking a shot, the situation that the battery case position is stretched or explodes can not occur yet, improve the coefficient of safety of cell safety explosion-protection equipment greatly; In addition, also be provided with groove 2 on the part 1 of thickness less than thickness of shell, especially, as the present invention's one preferred implementation, described groove is a cross shape, when inner pressure of battery sharply increases, when reaching the compressive yield strength of safety anti-explosive film, gas can at first break through the central point of cross shape, then can continue to collapse to the limit along groove, can allow battery container stressed evenly, thereby make that the air pressure resistance value consistency of safety anti-explosive film is better, can not make rupture pressure disc break away from housing and cause danger, further improve the security performance of battery owing to pressure is excessive.
Description of drawings
Fig. 1 is existing secondary cell explosion-proof casing schematic diagram;
Fig. 2 is existing secondary cell explosion-proof casing schematic diagram;
Fig. 3 is existing secondary cell explosion-proof casing schematic diagram;
Fig. 4 is a secondary cell explosion-proof casing schematic diagram of the present invention;
Fig. 5 is Fig. 4 A place enlarged diagram;
Fig. 6 is a secondary cell explosion-proof casing upward view of the present invention;
Fig. 7 is Fig. 6 B place enlarged diagram.
Embodiment
Explosion-proof casing of the present invention can be used for various secondary cells, with the cylindrical secondary battery is example, as shown in Figure 4, comprise the part 1 of a thickness on the described secondary cell explosion-proof casing at least, also be provided with groove 2 on the part 1 of this thickness less than thickness of shell less than thickness of shell.
Described thickness can play the effect of rupture pressure disc less than the part 1 of thickness of shell, when inner pressure of battery sharply increases, when reaching the compressive yield strength of safety anti-explosive film, because this thickness is less than the thinner thickness of the part 1 of thickness of shell, under the impact of in battery is powerful, pressing, can fast the gas that gathers be discharged.
Described thickness can require according to the pressure release of different model battery to set less than area size, thickness and the compressive resistance of the part 1 of thickness of shell, if require the battery of preparation than thin walled shell, then this thickness is less less than the area size of the part 1 of thickness of shell, thickness also can be thinner, compressive resistance is less, and vice versa.In general, described thickness is generally the 2/3-1/2 of the thickness of shell adjacent with it less than the thickness of the part 1 of thickness of shell, is generally the 0.20-0.35 millimeter, is preferably the 0.2-0.3 millimeter; Thickness is arranged on the sidewall of battery less than the part 1 of thickness of shell as described, and then this thickness is the 2/3-1/2 of the battery side wall thickness adjacent with it less than the thickness of the part 1 of thickness of shell; Thickness is arranged on battery bottom less than the part 1 of thickness of shell as described, and then this thickness is the 2/3-1/2 of the battery bottom thickness adjacent with it less than the thickness of the part 1 of thickness of shell.This thickness is the 19-46 kg/cm less than the compressive resistance of the part 1 of thickness of shell
2, be preferably the 19-40 kg/cm
2
This thickness is at least 1 less than the number of the part 1 of thickness of shell, and can require to be provided with its number according to the pressure release of battery.
This thickness can be arranged on optional position on the housing less than the part 1 of thickness of shell, optional position as housing wall or housing bottom, preferably this part 1 is not put at housing bottom, hinder the problem of inside battery gas quick drain like this with regard to not occurring blocking a shot, the situation that the battery case position is stretched or explodes can not appear, and be arranged on the bottom, not only preparation technology is simple to operate, also can not influence the outward appearance of battery.More preferably under the situation, as shown in Figure 4, described housing bottom also comprises the boss 3 of bottom center and the step 4 between this boss 3 and the battery case mural margin, by Fig. 4 and Fig. 5 (Fig. 5 is Fig. 4 A place enlarged diagram) as can be seen, because this step 4 is lower than boss 3, the part 1 of thickness less than thickness of shell is arranged on this step 4, when battery is placed, this thickness just can not stopped by the table top that battery is placed less than the part 1 of thickness of shell, when inner pressure of battery breaks through this thickness less than the part 1 of thickness of shell, the gas of emitting just can not hindered, and discharges more smooth and easyly, so described thickness preferably is arranged on this step 4 less than the part 1 of thickness of shell.
With the column secondary battery is example, in general, described column secondary battery bottom boss 3 is circular, therefore, step 4 between described boss 3 and the battery shell wall is a ring-shaped step, and described thickness just is arranged on the ring-shaped step 4 between boss 3 and the battery shell wall less than the part 1 of thickness of shell.
Can be according to the pressure release requirement, the part 1 of a plurality of thickness less than thickness of shell is set on housing, as shown in Figure 6, thickness on the described ring-shaped step 4 that is arranged between boss 3 and the battery shell wall is preferably 2-8 less than the number of the part 1 of thickness of shell, the more important thing is, when since some accidental cause cause a plurality of thickness less than in the part 1 of thickness of shell certain or some can not normally be broken through the time, what can also guarantee other can operate as normal, makes the security performance of battery better; A plurality of thickness are not particularly limited less than the spacing between the part 1 of thickness of shell, are generally symmetrical distribution.
Described thickness is formed by blind hole 5 less than the part 1 of thickness of shell, described blind hole 5 can be formed at the one or both sides of thickness less than the part 1 of thickness of shell, under the preferable case, as shown in Figure 5, described blind hole 5 can be formed at the both sides of thickness less than the part 1 of thickness of shell.
Described thickness is to form by preparation blind hole 5 backs on battery container less than the part 1 of thickness of shell, and the preparation method of described blind hole 5 can adopt method preparation known in those skilled in the art, as adopting the method preparation of punching press.Described blind hole 5 can be by housing punching press preparation outside to inside, also can be by the outside punching press preparation of enclosure interior, punching press obtains remaining housing parts after the blind hole and is the thickness that can play the rupture pressure disc effect part 1 less than thickness of shell, in order to make between Battery Pole Core and thickness the part 1 a little exhaust space is arranged less than thickness of shell, under the preferable case, as shown in Figure 5, described blind hole 5 is that the intermediate layer of two blind holes that form inside and outside housing is the part 1 of thickness less than thickness of shell by the preparation of punching press simultaneously inside and outside the housing.The shape of described blind hole 5 can be random geometry, as circular or square, it is corresponding with the shape of blind hole 5 less than the shape of the part 1 of thickness of shell that punching press obtains the remaining thickness in blind hole 5 backs, for the ease of operation, under the preferable case, described blind hole 5 be shaped as circle, also for circular, this thickness is generally the 1/10-1/8 of cylindrical housings base diameter length to this thickness that punching press obtains less than the diameter of the part 1 of thickness of shell less than the part 1 of thickness of shell.
Also be provided with groove 2 on the part 1 of described thickness less than thickness of shell, described groove 2 preferably is arranged on the outer surface of thickness less than the part 1 of thickness of shell, the described thickness that is arranged on can play the effect that guiding gas is in time discharged less than the described groove 2 of part 1 outer surface of thickness of shell, if and can avoid inner pressure of battery sharply to increase, cause inner pressure of battery too high and cause gas directly described part 1 to be broken through making this part 1 to break away from housing and cause danger may.
The bar number of described groove 2 can be one or more, the bar number of described groove 2 is preferably many, described many grooves 2 can parallelly distribute, also can be interspersed, described being interspersed refers to that described groove 2 in the surperficial horizontal and vertical cross-distribution of described thickness less than the part 1 of thickness of shell, interconnects many grooves 2.Under the preferable case, many groove 2 is interspersed, as shown in Figure 7, being two with the quantity of groove 2 is example, the cross-like shape of described groove 2 for being interspersed and forming by two grooves, and be positioned at the central authorities of thickness less than the part 1 of thickness of shell, She Ji advantage is like this, when battery owing to unexpected reason, cause interior the pressure sharply to increase as short circuit, when reaching the compressive yield strength of this part 1, can make gas at first break through the crosspoint, center 6 of the cross shape groove that two grooves intersect to form, this part 1 can be broken apart gradually along groove, help the timely discharge of gas, and the residual body of this part 1 still is connected battery container bottom, can not break away from housing and causes danger.
The degree of depth of described every groove 2 can be according to different variation of different model battery requirement of withstand voltage with width, principle is to make groove 2 before reaching the blast pressure of battery, guarantee that groove 2 is broken through by the pressure in the battery, the blast pressure of battery is high more, the degree of depth of groove 2 is shallow more, width is more little, and vice versa.In general, the width of described every groove 2 is the 0.5-2.5 millimeter, is preferably the 0.5-2.0 millimeter; The degree of depth of described groove 2 is the 0.10-0.25 millimeter, is preferably the 0.15-0.25 millimeter; The spacing of adjacent two grooves 2 that are parallel to each other is the 0.8-1.6 millimeter.
Described groove 2 is arranged on the outer surface of thickness less than the part 1 of thickness of shell, and is arranged within the scope of this part 1, if this part 1 is circular, then the length of described groove can be less than or equal to the diameter of part 1.The cross section of described groove 2 can have any shape, and as semicircle or V font, the degree of depth of described groove 2 is generally the 0.10-0.25 millimeter.In order more to help releasing fast of gas, manufacture craft is simpler, and the sectional area of described groove 2 is preferably the V font.The preparation method of described groove 2 can adopt the method that well known to a person skilled in the art conventional mechanical pressure at quarter, described explosion-resistant enclosure is 2 machinery pressures at quarter from the box hat drawing and forming to groove, can once finish step by step according to the method that well known to a person skilled in the art the preparation of diel and shell.
Comprise pole piece, nonaqueous electrolytic solution and battery container according to secondary cell provided by the invention, described pole piece comprises positive pole, negative pole and barrier film, except described battery container is explosion-proof casing provided by the invention, can use conventional positive pole, negative pole, barrier film and nonaqueous electrolytic solution.
According to the preparation method of secondary cell provided by the invention, except described housing prepared according to method provided by the invention, other step was conventionally known to one of skill in the art.In general,, pole piece and the electrolyte that obtains is sealed in the secondary cell explosion-proof casing provided by the invention, can obtains secondary cell provided by the invention the described positive pole for preparing and negative pole and pole piece of barrier film formation.
Claims (10)
1. secondary cell explosion-proof casing, it is characterized in that, at least comprise the part (1) of a thickness on the described housing less than thickness of shell, also be provided with groove (2) on the part (1) of this thickness less than thickness of shell, described thickness is formed by blind hole (5) less than the part (1) of thickness of shell, and described blind hole (5) is formed at the both sides of thickness less than the part (1) of thickness of shell; Described blind hole (5) and thickness are circular less than the part (1) of thickness of shell, and this thickness is the 1/10-1/8 of cylindrical housings base diameter length less than the diameter of the part (1) of thickness of shell.
2. housing according to claim 1, wherein, described thickness is arranged on housing bottom less than the part (1) of thickness of shell, described housing also comprises the boss (3) at housing bottom center and the step (4) between this boss (3) and the battery case mural margin, and described thickness is arranged on the step (4) less than the part (1) of thickness of shell.
3. housing according to claim 2, wherein, described thickness is 2-8 less than the number of the part (1) of thickness of shell.
4. housing according to claim 1, wherein, described thickness is the 2/3-1/2 of the thickness of shell adjacent with it less than the thickness of the part (1) of thickness of shell, compressive resistance is the 19-46 kg/cm
2
5. housing according to claim 1, wherein, described groove (2) is arranged on the outer surface of thickness less than the part (1) of thickness of shell.
6. housing according to claim 1 or 5, wherein, described groove (2) is many, described many grooves are parallel distribution or are interspersed.
7. housing according to claim 6, wherein, the width of described every groove (2) is the 0.5-2.5 millimeter; The degree of depth is the 0.10-0.25 millimeter; The spacing of adjacent two grooves (2) that are parallel to each other is the 0.8-1.6 millimeter.
8. housing according to claim 6, wherein, described groove (2) is two, described two grooves formation cross shape that is interspersed.
9. housing according to claim 1 or 5, wherein, the cross section of described groove (2) is the V font.
10. secondary cell, this battery comprises pole piece, nonaqueous electrolytic solution and battery container, and described pole piece comprises positive pole, negative pole and barrier film, and described pole piece and nonaqueous electrolytic solution are sealed in the battery container, it is characterized in that described battery container is any described housing among the claim 1-9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2006101618007A CN101212033B (en) | 2006-12-25 | 2006-12-25 | Secondary battery explosion-proof shell and battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2006101618007A CN101212033B (en) | 2006-12-25 | 2006-12-25 | Secondary battery explosion-proof shell and battery |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101212033A CN101212033A (en) | 2008-07-02 |
| CN101212033B true CN101212033B (en) | 2010-06-23 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2006101618007A Expired - Fee Related CN101212033B (en) | 2006-12-25 | 2006-12-25 | Secondary battery explosion-proof shell and battery |
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| Country | Link |
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| CN (1) | CN101212033B (en) |
Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102130313A (en) * | 2010-01-12 | 2011-07-20 | 比克国际(天津)有限公司 | Soft packaging battery and battery pack |
| CN106133945B (en) * | 2014-07-15 | 2019-12-17 | 三洋电机株式会社 | Electricity storage device |
| JP6536354B2 (en) * | 2015-11-02 | 2019-07-03 | 株式会社村田製作所 | Battery, battery pack, electronic device, electric vehicle, power storage device and power system |
| CN107615511B (en) * | 2015-12-31 | 2021-01-22 | 深圳市大富精工有限公司 | Battery with a battery cell |
| KR102283788B1 (en) | 2016-09-21 | 2021-07-30 | 삼성에스디아이 주식회사 | Rechargeable battery |
| CN108470872A (en) * | 2018-04-13 | 2018-08-31 | 河南省超霸新能源科技有限公司 | A kind of explosion-proof cylindrical battery of cathode |
| CN109226506B (en) * | 2018-10-19 | 2023-06-23 | 上海中天铝线有限公司 | Terrace die and assembly for stamping easily-broken grooves on integral lithium battery explosion-proof cover plate |
| DE102018127263A1 (en) * | 2018-10-31 | 2020-04-30 | Tdk Electronics Ag | capacitor |
| CN109873094A (en) * | 2019-03-14 | 2019-06-11 | 四川福来威新能源科技有限公司 | Button cell |
| JP2025501376A (en) * | 2022-02-21 | 2025-01-17 | 香港時代新能源科技有限公司 | Batteries and power consuming devices |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2588542Y (en) * | 2002-12-19 | 2003-11-26 | 国营建中化工总公司 | Column type lithium battery explosion-proof safety casing |
| CN2824298Y (en) * | 2005-08-02 | 2006-10-04 | 周基平 | Battery explosion-proof cover plate and lithium ion cell with same |
-
2006
- 2006-12-25 CN CN2006101618007A patent/CN101212033B/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2588542Y (en) * | 2002-12-19 | 2003-11-26 | 国营建中化工总公司 | Column type lithium battery explosion-proof safety casing |
| CN2824298Y (en) * | 2005-08-02 | 2006-10-04 | 周基平 | Battery explosion-proof cover plate and lithium ion cell with same |
Non-Patent Citations (3)
| Title |
|---|
| JP昭63-294665A 1988.12.01 |
| JP特开2001-23596A 2001.01.26 |
| JP特开2005-235531A 2005.09.02 |
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| CN101212033A (en) | 2008-07-02 |
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Effective date of registration: 20160920 Address after: 338000 Jiangxi province Xinyu City Yushui Village Industrial Base Patentee after: Jiangxi Shuang Hua Industrial Development Co., Ltd. Address before: Kwai Chung town Yanan Road, BYD Industrial Park in Longgang District of Shenzhen City, Guangdong province 518119 Patentee before: Biyadi Co., Ltd. |
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Denomination of invention: Secondary battery explosion-proof shell and battery Effective date of registration: 20171221 Granted publication date: 20100623 Pledgee: Postal Savings Bank of China, Limited by Share Ltd, Xinyu branch Pledgor: Jiangxi Shuang Hua Industrial Development Co., Ltd. Registration number: 2017360000044 |
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