CN207381473U - Over-charging of battery safety guard and lithium ion battery - Google Patents
Over-charging of battery safety guard and lithium ion battery Download PDFInfo
- Publication number
- CN207381473U CN207381473U CN201721539817.1U CN201721539817U CN207381473U CN 207381473 U CN207381473 U CN 207381473U CN 201721539817 U CN201721539817 U CN 201721539817U CN 207381473 U CN207381473 U CN 207381473U
- Authority
- CN
- China
- Prior art keywords
- battery
- over
- conductive sheet
- charging
- safety
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Landscapes
- Secondary Cells (AREA)
- Sealing Battery Cases Or Jackets (AREA)
- Connection Of Batteries Or Terminals (AREA)
Abstract
The utility model is related to battery technology field, more particularly, to a kind of over-charging of battery safety guard and lithium ion battery.The over-charging of battery safety guard, including the first conductive sheet, the second conductive sheet and safety overturning component；Safety overturning component includes Safety shell；The inner cavity of Safety shell is connected with inside battery, for when the gas pressure intensity of inside battery changes, the gas pressure intensity in the inner cavity of Safety shell can also to change；Safety shell includes rotating sheet；Rotating sheet can be overturn when the gas pressure intensity in the inner cavity of Safety shell increases, so that the first conductive sheet and the second conductive sheet are electrically connected to form short circuit.The lithium ion battery, including the over-charging of battery safety guard.The utility model has preferable security performance.
Description
Technical field
The utility model is related to battery technology field, more particularly, to a kind of over-charging of battery safety guard and lithium from
Sub- battery.
Background technology
Lithium ion battery is due to high-energy, high power capacity and high power, having been used for hybrid vehicle and electronic vapour
Vehicle.Since inside battery positive and negative electrode material has very strong chemical reactivity, there are the unexpected situations such as overcharge or short circuit
When, the reaction of positive and negative pole material and electrolyte generates substantial amounts of high-temperature gas, if battery does not possess reliable protective device,
Expansion may bring battery catches fire or explosion to gas rapidly.Therefore, for the power battery for being used as automobile power source, peace
Full property is the most important thing, and it is exactly one of three most extreme safety tests of power battery to overcharge test.Current battery protection side
In formula, risen using the pressure of inside battery when overcharging and bursting diaphragm is made to cut off electric current, realize the safeguard protection of battery, but its
Effect has certain limitation, it is possible to the situation that can not cut off electric current occurs.
Utility model content
It is existing to solve the purpose of this utility model is to provide a kind of over-charging of battery safety guard and lithium ion battery
There is bursting diaphragm present in technology to cut off the technical issues of protective effect of the protected mode of electric current is limited.
The utility model provides a kind of over-charging of battery safety guard, including the first conductive sheet, the second conductive sheet and
Safety overturning component；The safety overturning component includes Safety shell；The inner cavity of the Safety shell is connected with inside battery,
For when the gas pressure intensity of inside battery changes, the gas pressure intensity in the inner cavity of the Safety shell can also to become
Change；The Safety shell includes rotating sheet；The rotating sheet can increase in the gas pressure intensity in the inner cavity of the Safety shell
Shi Fasheng is overturn, so that first conductive sheet and the second conductive sheet are electrically connected to form short circuit.
Further, the rotating sheet includes the overturning main body of the inner cavity convex to the Safety shell.
Further, the length extending direction in the section of the overturning main body is in arc line shaped.
Further, the rotating sheet further includes the bulge-structure positioned at the outside of the overturning main body；The protrusion knot
Structure is electrically connected with first conductive sheet；The bulge-structure and the second conductive sheet gap setting；The bulge-structure energy
It is enough to be in contact when the overturning main body becomes evagination from convex with the second conductive sheet, so that first conductive sheet is led with second
Electric piece is electrically connected to form short circuit.
Further, the top surface of the bulge-structure is curved surface or plane.
Further, the bulge-structure and the rotating sheet are an integral structure or split structure；The protrusion knot
Structure is solid or hollow body.
Further, the top surface of the bulge-structure is less than the plane where the periphery of the rotating sheet.
Further, the Safety shell further includes gusset part, the periphery of the rotating sheet and the side round part split-phase
Connection.
Further, connected between the gusset part and second conductive sheet by insulation spacer.
The utility model additionally provides a kind of lithium ion battery, including the over-charging of battery safety guard.
Compared with prior art, the beneficial effects of the utility model are：
Over-charging of battery safety guard provided by the utility model, including the first conductive sheet, the second conductive sheet and safety
Overturn component；Safety overturning component includes Safety shell；The inner cavity of Safety shell is connected with inside battery, in battery
When the gas pressure intensity in portion changes, the gas pressure intensity in the inner cavity of Safety shell can also change；Safety shell includes turning over
Rotor；Rotating sheet can be overturn when the gas pressure intensity in the inner cavity of Safety shell increases, so that the first conductive sheet and
Two conductive sheets are electrically connected to form short circuit.By using being overcharged in battery or short circuit phenomenon, the gas of inside battery are heated
Expansion causes inside battery air pressure drastically to raise, and increases so as to cause the gas pressure intensity in the inner cavity of Safety shell is also corresponding therewith
Greatly, when the gas pressure intensity in the inner cavity of full housing increases to a certain extent, rotating sheet is forced to deform upon, makes the first conductive sheet
It is electrically connected with the second conductive sheet, and the short circuit for forming outside batteries releases battery core energy, avoids causing security incident, so as to have
Beneficial to the security performance for improving battery, power battery head cover security of the prior art can also be overcome not satisfactory not
Foot.
The lithium ion battery that the utility model also provides, including the over-charging of battery safety guard.Based on above-mentioned
Analysis understands that the lithium ion battery has preferable security performance.
Description of the drawings
It, below will be right in order to illustrate more clearly of specific embodiment of the present invention or technical solution of the prior art
Specific embodiment or attached drawing needed to be used in the description of the prior art are briefly described, it should be apparent that, it describes below
In attached drawing be the utility model some embodiments, for those of ordinary skill in the art, do not paying creativeness
On the premise of work, other attached drawings are can also be obtained according to these attached drawings.
Fig. 1 is the structure diagram for the over-charging of battery safety guard that the utility model embodiment one provides；
Fig. 2 is the structural representation at another visual angle for the over-charging of battery safety guard that the utility model embodiment one provides
Figure；
Fig. 3 is the structural representation at the another visual angle for the over-charging of battery safety guard that the utility model embodiment one provides
Figure；
Fig. 4 is the sectional view for the over-charging of battery safety guard that the utility model embodiment one provides.
In figure：
The first conductive sheets of 101-；The second conductive sheets of 102-；103- Safety shells；
104- overturns main body；105- gussets part；106- insulation spacers；
107- bulge-structures；108- air admission holes.
Specific embodiment
The technical solution of the utility model is clearly and completely described below in conjunction with attached drawing, it is clear that described
Embodiment is the utility model part of the embodiment, instead of all the embodiments.Based on the embodiment in the utility model, sheet
Field those of ordinary skill all other embodiments obtained without making creative work, belong to this practicality
Novel protected scope.
, it is necessary to explanation in the description of the utility model, term " " center ", " on ", " under ", it is "left", "right", " perpendicular
Directly ", the orientation of the instructions such as " level ", " interior ", " outer " or position relationship are based on orientation shown in the drawings or position relationship, are only
The utility model must have specific with the device or element for simplifying description rather than instruction or hint meaning for ease of description
Orientation, with specific azimuth configuration and operation, therefore it is not intended that limitation to the utility model.In addition, term " the
One ", " second ", " the 3rd " are only used for description purpose, and it is not intended that instruction or hint relative importance.
, it is necessary to which explanation, unless otherwise clearly defined and limited, term " are pacified in the description of the utility model
Dress ", " connected ", " connection " should be interpreted broadly, for example, it may be being fixedly connected or being detachably connected or integrally
Connection；Can be mechanical connection or electrical connection；It can be directly connected, can also be indirectly connected by intermediary,
It can be the connection inside two elements.For the ordinary skill in the art, can above-mentioned art be understood with concrete condition
Concrete meaning of the language in the utility model.
Embodiment one
Referring to shown in Fig. 1 to Fig. 4, the utility model embodiment provides a kind of over-charging of battery safety guard, including
First conductive sheet 101, the second conductive sheet 102 and safety overturning component；Safety overturning component includes Safety shell 103；Containment
The inner cavity of body 103 is connected with inside battery, for when the gas pressure intensity of inside battery changes, Safety shell 103
Gas pressure intensity in inner cavity can also change namely the content cavity of Safety shell 103 in gas pressure intensity with inside battery
Gas pressure intensity one changes；Safety shell 103 includes rotating sheet；Rotating sheet can be in the gas in the inner cavity of Safety shell 103
Pressure is overturn when increasing, so that the first conductive sheet 101 and the second conductive sheet 102 are electrically connected to form short circuit, that is to say, that when
When gas pressure intensity in the inner cavity of Safety shell 103 increases to setting value, rotating sheet can be in the gas of the inner cavity of Safety shell 103
It is deformed upon under the action of body, so that the first conductive sheet 101 is electrically connected with the second conductive sheet 102, forms outside batteries
Short circuit condition, to release battery core energy.Air admission hole 108 on Safety shell 103 is connected with inside battery.
In the optional scheme of the embodiment, when the first conductive sheet 101 is electrically connected with the anode of battery, the second conductive sheet
102 are electrically connected with the cathode or external ground line of battery；And when cathode or external ground the line electricity of the first conductive sheet 101 and battery
Connection, the second conductive sheet 102 are electrically connected with the anode of battery.
The embodiment provide over-charging of battery safety guard, by using battery overcharge or short circuit show
As, inside battery, when gases are heated, they expand that inside battery air pressure is caused drastically to raise, in the inner cavity so as to cause Safety shell 103
Gas pressure intensity also corresponding increase therewith, when the gas pressure intensity increase in the inner cavity of full housing to a certain extent when, force overturning
Piece deforms upon, and the first conductive sheet 101 is made to be electrically connected with the second conductive sheet 102, and the short circuit for forming outside batteries releases electricity
Core energy avoids causing security incident, so as to be conducive to improve the security performance of battery, can also overcome of the prior art dynamic
The not satisfactory deficiency of power battery cap security.
In the optional scheme of the embodiment, Safety shell 103 further includes gusset part 105, the periphery and gusset of rotating sheet
Part 105 is connected, i.e., the periphery of rotating sheet is tightly connected with gusset part 105, and rotating sheet can be one with gusset part 105
Body structure, or Split type structure.
In the optional scheme of the embodiment, connected between 105 and second conductive sheet 102 of gusset part by insulation spacer 106
It connects.
Specifically, the second conductive sheet 102 is located at the one side of the opening of gusset part 105；The material of insulation spacer 106 can
Think polyethylene, polypropylene or polyvinyl chloride.It should be noted that the material of insulation spacer 106 is not only limited in the embodiment
In three of the above, the isolation material of other forms can also be freely chosen according to actual condition, to realize the function of insulation；It is right
In the insulation spacer 106 of other forms, the embodiment no longer specifically repeats one by one.
In the optional scheme of the embodiment, rotating sheet includes the overturning main body 104 of the inner cavity convex to Safety shell 103.
Specifically, overturning main body 104 is connected with the periphery of gusset part 105.Come from the outside of Safety shell 103
It sees, overturning main body 104 is recessed the inner cavity of Safety shell 103；Convex overturns main body 104 i.e. from the inner cavity of Safety shell 103
The convex inner cavity into Safety shell 103.When the pressure increase in the inner cavity of Safety shell 103, due to that can send out overturning main body 104
Raw deformation, makes outer projection of the overturning main body 104 from 103 inner cavity of Safety shell to Safety shell 103.It should be noted that it turns over
Turning main body 104 can be made of shrapnel, to ensure that it can be deformed upon.
In the optional scheme of the embodiment, the length extending direction for overturning the section of main body 104 is in arc line shaped.
Specifically, overturning main body 104 can in the form of sheets, after overturning main body 104 is sectioned, the length extension side in section
To in arc line shaped, so as to be conducive to, elastic deformation can occur, evagination is become from convex.It should be noted that the embodiment
In, the length extending direction in section of overturning main body 104 can also be made in other shapes, such as fold-line-shaped, as long as in Safety shell
In 103 inner cavity gas pressure intensity increase when, overturning main body 104 can due to the inner cavity convex of Safety shell 103 become to
The external evagination of Safety shell 103.
In the optional scheme of the embodiment, the shape that gusset part 105 is surrounded can be circular or polygon.In addition,
The periphery of gusset part 105 can also have flanging, and flanging, which makes the one of gusset part 105 to form one, has smaller hole, and
Overturning main body 104 is connected with flanging.
In the optional scheme of the embodiment, rotating sheet further includes the bulge-structure 107 positioned at the outside of overturning main body 104；
Bulge-structure 107 is electrically connected with the first conductive sheet 101；107 and second conductive sheet of bulge-structure, 102 gap setting；Bulge-structure
107 can be in contact when overturning main body 104 and becoming evagination from convex with the second conductive sheet 102 so that the first conductive sheet 101 and
Second conductive sheet 102 is electrically connected to form short circuit.
Specifically, the outside of overturning main body 104 is opposite with the inside for overturning main body 104, and the inside of overturning main body 104 refers to
Be overturning one side of the main body 104 towards the inner cavity of Safety shell 103, and the outside for overturning main body 104 is referred to backwards to safety
The one side of the inner cavity of housing 103.Bulge-structure 107 can be in the form of a column or hemispherical etc.；Second conductive sheet 102 and bulge-structure
107 are oppositely arranged, and the second conductive sheet 102 is located at the outside of Safety shell 103.Gas in the inner cavity of Safety shell 103
After pressure increases to setting value, overturning main body 104 deforms upon, and becomes evagination from convex, and bulge-structure 107 is with overturning main body
104 move together, and bulge-structure 107 is moved to the direction where the second conductive sheet 102, the top surface of bulge-structure 107 just with
Second conductive sheet 102 is in contact, and so as to realize that the second conductive sheet 102 is electrically connected with the first conductive sheet 101, is formed afterwards short
Road.
In the optional scheme of the embodiment, bulge-structure 107 is located at the center of overturning main body 104, certainly, protrusion knot
Structure 107 can also be located at the other positions in overturning main body 104.The top surface of bulge-structure 107 is curved surface or plane.
In the optional scheme of the embodiment, bulge-structure 107 is an integral structure with rotating sheet or split structure；Protrusion
Structure 107 is solid or hollow body.Bulge-structure 107 can be by being fixed on overturning master by welding or other connection modes
On body 104.
In the optional scheme of the embodiment, the top surface of bulge-structure 107 is prevented less than the plane where the periphery of rotating sheet
When overturning main body 104 is not overturn, bulge-structure 107 can touch the second conductive sheet 102.
Over-charging of battery safety guard is provided in the embodiment, during use is charged normal, bulge-structure 107 is not
It is contacted with the second conductive sheet 102, there is no short circuit currents, battery between the first conductive sheet 101 and the second conductive sheet 102 normally to fill
Electricity.When battery occurs accident or overcharges, internal temperature of battery rise, the gas pressure intensity increase of inside battery, so that peace
Gas pressure intensity increase in the inner cavity of full housing 103, when gas pressure intensity reaches overturning main body 104 in the inner cavity of Safety shell 103
Eversion pressure when, overturning main body 104 overturn, i.e., overturning main body 104 evagination is become from convex, bulge-structure 107 moves up,
And contacted with the second conductive sheet 102, the second conductive sheet 102 is contacted with bulge-structure 107 or the second conductive sheet 102 and bulge-structure
The position of 107 contacts fuses, so that the first conductive sheet 101 is connected with the second conductive sheet 102, realizes battery outer short
Road releases battery core energy, has the function that protect battery.On the one hand it may insure to digest and overcharge electric current, on the other hand may be used
To discharge the hidden danger energy content of battery, eliminate safe hidden trouble.
In the optional scheme of the embodiment, venthole can be set on the second conductive sheet 102, the venthole and outside batteries
It is connected, i.e., is connected with air；The inversion air pressure of the overturning main body 104 of safety overturning component is 0.3MPa~0.5MPa,
And it will not be ruptured under 0.7MPa air pressures, turning height is not less than 0.5mm.When the gas pressure in the inner cavity of Safety shell 103
It is powerful when 0.7MPa, the gusset part 105 of Safety shell 103 and/or overturning main body 104 can then rupture, such battery
Internal gases at high pressure release first from rent, and the venthole passed through on the second conductive sheet 102 is discharged to outside battery
Portion effectively prevents the explosion of entire battery.It should be noted that in the embodiment, can also be installed on Safety shell 103
Relief valve, in a manner of replacing Safety shell 103 and rupture, when the gas pressure intensity in the inner cavity of Safety shell 103 is more than 0.7MPa
When, to realize at relief valve, the gas in inside battery is discharged.
In conclusion the over-charging of battery safety guard that the embodiment provides, both by overturning the overturning of main body 104,
The first conductive sheet 101 is made to be connected with the second conductive sheet 102, battery is made to realize external short circuit, releases battery core energy；It can pass through again
The release for rupturing to realize gas of Safety shell 103, effectively avoids battery explosion, so as to substantially increase cell charge protection
Performance.
Embodiment two
The utility model embodiment provides a kind of lithium ion battery, including over-charging of battery safety guard.It is specific and
Speech, the opposite opposite side of the opening of gusset part 105 is fixedly connected with the housing of battery, and the inner cavity of Safety shell 103 with
Inside battery is connected.
Finally it should be noted that：Various embodiments above is only to illustrate the technical solution of the utility model rather than it is limited
System；Although the utility model is described in detail with reference to foregoing embodiments, those of ordinary skill in the art should
Understand：It can still modify to the technical solution recorded in foregoing embodiments either to which part or whole
Technical characteristic carries out equivalent substitution；And these modifications or replacement, the essence of appropriate technical solution is not made to depart from this practicality newly
The scope of each embodiment technical solution of type.In addition, it will be appreciated by those of skill in the art that although some implementations described herein
Example includes some features included in other embodiments rather than other feature, but the combination of the feature of different embodiments is anticipated
Taste within the scope of the utility model and forms different embodiments.For example, in the following claims, institute
The one of arbitrary of claimed embodiment mode can use in any combination.
Claims (10)
1. a kind of over-charging of battery safety guard, which is characterized in that including the first conductive sheet, the second conductive sheet and safety overturning
Component；The safety overturning component includes Safety shell；The inner cavity of the Safety shell is connected with inside battery, in electricity
When gas pressure intensity inside pond changes, the gas pressure intensity in the inner cavity of the Safety shell can also change；The peace
Full housing includes rotating sheet；The rotating sheet can be turned over when the gas pressure intensity in the inner cavity of the Safety shell increases
Turn, so that first conductive sheet and the second conductive sheet are electrically connected to form short circuit.
2. over-charging of battery safety guard according to claim 1, which is characterized in that the rotating sheet is included to described
The overturning main body of the inner cavity convex of Safety shell.
3. over-charging of battery safety guard according to claim 2, which is characterized in that the section of the overturning main body
Length extending direction is in arc line shaped.
4. the over-charging of battery safety guard according to Claims 2 or 3, which is characterized in that the rotating sheet further includes
Bulge-structure positioned at the outside of the overturning main body；The bulge-structure is electrically connected with first conductive sheet；The protrusion
Structure and the second conductive sheet gap setting；The bulge-structure can it is described overturning main body evagination is become from convex when with
Second conductive sheet is in contact, so that first conductive sheet and the second conductive sheet are electrically connected to form short circuit.
5. over-charging of battery safety guard according to claim 4, which is characterized in that the top surface of the bulge-structure is
Curved surface or plane.
6. over-charging of battery safety guard according to claim 4, which is characterized in that the bulge-structure is turned over described
Rotor is an integral structure or split structure；The bulge-structure is solid or hollow body.
7. over-charging of battery safety guard according to claim 4, which is characterized in that the top surface of the bulge-structure is low
Plane where the periphery of the rotating sheet.
8. over-charging of battery safety guard according to any one of claim 1-3, which is characterized in that the containment
Body further includes gusset part, and the periphery of the rotating sheet is connected with the side round part split-phase.
9. over-charging of battery safety guard according to claim 8, which is characterized in that the gusset part and described the
It is connected between two conductive sheets by insulation spacer.
10. a kind of lithium ion battery, which is characterized in that including over-charging of battery as claimed in any one of claims 1-9 wherein safety
Protective device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721539817.1U CN207381473U (en) | 2017-11-16 | 2017-11-16 | Over-charging of battery safety guard and lithium ion battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721539817.1U CN207381473U (en) | 2017-11-16 | 2017-11-16 | Over-charging of battery safety guard and lithium ion battery |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207381473U true CN207381473U (en) | 2018-05-18 |
Family
ID=62333279
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721539817.1U Active CN207381473U (en) | 2017-11-16 | 2017-11-16 | Over-charging of battery safety guard and lithium ion battery |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN207381473U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107665970A (en) * | 2017-11-16 | 2018-02-06 | 北京国能电池科技有限公司 | Over-charging of battery safety guard and lithium ion battery |
| WO2020151473A1 (en) * | 2019-01-25 | 2020-07-30 | 比亚迪股份有限公司 | Battery cover plate, battery, and vehicle |
-
2017
- 2017-11-16 CN CN201721539817.1U patent/CN207381473U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107665970A (en) * | 2017-11-16 | 2018-02-06 | 北京国能电池科技有限公司 | Over-charging of battery safety guard and lithium ion battery |
| WO2020151473A1 (en) * | 2019-01-25 | 2020-07-30 | 比亚迪股份有限公司 | Battery cover plate, battery, and vehicle |
| CN111490190A (en) * | 2019-01-25 | 2020-08-04 | 比亚迪股份有限公司 | Battery cover plate, battery and vehicle |
| CN111490190B (en) * | 2019-01-25 | 2021-08-10 | 比亚迪股份有限公司 | Battery cover plate, battery and vehicle |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN203733907U (en) | Safety device of lithium ion battery | |
| KR101667966B1 (en) | Cap assembly and secondary battery including the same | |
| KR20000009698A (en) | Current breaker of secondary battery | |
| KR20220145396A (en) | End cover assembly, battery cell, evacuation method thereof, battery and electrical device | |
| US20130143078A1 (en) | End cover assembly for battery and battery containing the same | |
| US12009486B2 (en) | Safe and high-energy USB rechargeable battery | |
| CN101170168A (en) | Covering board component with explosion-proof function | |
| JP3188012U (en) | Lithium-ion battery safety device | |
| CN105811013A (en) | High-rate anti-explosion lithium battery structure and fixing method for battery cell and steel shell | |
| CN104577029A (en) | Safety device for lithium ion battery | |
| CN207381473U (en) | Over-charging of battery safety guard and lithium ion battery | |
| CN209087921U (en) | Cap assembly and secondary cell | |
| CN102142531A (en) | Battery, battery protection device and manufacture method thereof | |
| CN205488385U (en) | Explosion -proof lithium cell structure of high magnification | |
| US20180219208A1 (en) | Lithium storage battery with integrated circuit-breaker for improved operating safety | |
| KR102331123B1 (en) | Cap Assembly for Cylindrical Battery Cell Comprising Elastic Member | |
| CN206610880U (en) | A kind of lithium ion battery | |
| CN102544397B (en) | A kind of lithium rechargeable battery | |
| CN104953083A (en) | Battery cell structure capable of preventing battery fire explosion and lithium ion battery adopting battery cell structure | |
| KR102052063B1 (en) | secondary battery | |
| CN204760489U (en) | Prevent electric core structure of explosion on fire and lithium ion battery who has this electricity core structure | |
| CN107665970A (en) | Over-charging of battery safety guard and lithium ion battery | |
| CN206806456U (en) | The lithium ion battery that a kind of high-capacity positive negative pole is drawn in the same direction | |
| CN220753581U (en) | Battery cover plate and lithium ion secondary battery | |
| JP2009152173A (en) | Safety device for battery |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |