CN109713210B - Isobaric liquid injection device and method of liquid injection machine - Google Patents
Isobaric liquid injection device and method of liquid injection machine Download PDFInfo
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- CN109713210B CN109713210B CN201910166171.4A CN201910166171A CN109713210B CN 109713210 B CN109713210 B CN 109713210B CN 201910166171 A CN201910166171 A CN 201910166171A CN 109713210 B CN109713210 B CN 109713210B
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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
The invention discloses an isobaric liquid injection device of a liquid injection machine and a liquid injection method, comprising an upper bearing part and a lower bearing part which are connected through a buckling mechanism, wherein a bus plate is arranged at the top of the upper bearing part, at least two pressurizing pipes are longitudinally communicated with the upper end of the bus plate according to a spacing distance, at least one liquid injection component is longitudinally arranged on the upper bearing part according to a spacing distance, the liquid injection component penetrates through the bus plate and is communicated with the bus plate, a battery storage bin is arranged on the lower bearing part corresponding to the liquid injection component, the bus plate is communicated with the battery storage bin through an air duct, and the air duct is positioned at the rear side of the liquid injection component. According to the invention, the liquid injection assembly is pressurized step by step, and the battery storage bin is pressurized, so that the pressure difference exists between the liquid injection assembly and the battery storage bin, and the liquid injection efficiency is increased on the premise of ensuring that the surface of the battery is not expanded and deformed, thereby improving the production quality of the battery.
Description
Technical Field
The invention relates to battery production equipment, in particular to an isobaric liquid injection device of a liquid injection machine and a liquid injection method implemented by the isobaric liquid injection device of the liquid injection machine.
Background
At present, the common electrolyte injection method in the market is normal pressure injection, wherein the normal pressure injection is that the outer surface of a battery is under the atmospheric pressure environment, the liquid level of an injection cup is protected by the air pressure, and the electrolyte enters the battery through the pressure difference. Under the condition that the internal pressure of the battery is lower than the liquid level pressure of the liquid injection cup, liquid enters the battery, and the larger the pressure difference between the internal pressure and the liquid is, the larger the liquid flow rate is. In order to increase the liquid injection efficiency, the liquid level of the liquid injection cup is usually 0-0.2 Mpa, but the surface of the battery is easy to expand and deform due to the overlarge pressure difference between the inside and the outside of the battery, so that the quality of the product is reduced.
Disclosure of Invention
The present invention has been made in view of the above-described problems, and an object of the present invention is to provide a liquid injection device such as a liquid injection machine.
The present invention also aims to provide a liquid injection method implemented by the liquid injection device such as the liquid injection machine.
The technical scheme adopted by the invention for achieving the purpose is as follows:
the utility model provides a liquid injection device such as annotate liquid machine, includes upper bearing portion and lower bearing portion that connects through buckling mechanisms, upper bearing portion top is provided with the busbar, and this busbar upper end is provided with two at least pressurization pipes according to interval vertical intercommunication, is provided with at least one notes liquid subassembly according to interval vertical on this upper bearing portion, and this notes liquid subassembly runs through this busbar to with this busbar intercommunication, correspond on the lower bearing portion annotate liquid subassembly and be provided with the battery and store the storehouse, through the air duct intercommunication between busbar and this battery store the storehouse, this air duct is located annotate liquid subassembly rear side.
Preferably, at least one first air inlet hole and one second air inlet hole are formed in the upper surface of the confluence plate, the pressurizing pipe is arranged on the first air inlet hole and the second air inlet hole, a first air guide groove and a second air guide groove which are adjacent and are not communicated are formed in the confluence plate, the first air inlet hole and the first air guide groove are communicated to form a first air guide part, the first air guide part is communicated with each liquid injection assembly, and the second air inlet hole and the second air guide groove are communicated to form a second air guide part, and the second air guide part is communicated with each air guide pipe.
Preferably, the liquid injection assembly comprises a liquid injection cup and a liquid injection jack column which is arranged in the center of the liquid injection cup in an up-and-down moving manner, a liquid bin is arranged in the liquid injection cup, at least one vent hole which is communicated with the confluence plate and the liquid bin is arranged at the upper end of the liquid injection cup, the liquid injection jack column comprises an injection part and a push rod which are mutually connected, the upper end of the injection part extends out of the liquid injection cup and penetrates through the confluence plate, an injection groove is longitudinally penetrated in the center of the injection part, liquid injection holes are obliquely arranged at the top of the push rod downwards towards two sides, the injection groove and the liquid bin are communicated through the liquid injection holes, and a sealing ring for sealing a liquid outlet of the liquid injection cup is annularly arranged at the bottom of the push rod.
Preferably, an annular boss is formed on the periphery of the injection part in a protruding manner, and a first spring and a second spring are respectively arranged on the upper side and the lower side of the annular boss.
Preferably, the lower end surfaces of the left and right ends of the upper bearing part are respectively provided with at least one positioning pin, the left and right ends of the lower bearing part are provided with positioning insertion platforms corresponding to the positioning pins, insertion holes are longitudinally formed in the positioning insertion platforms in a penetrating manner, and the positioning pins are inserted into the insertion holes.
Preferably, the buckling mechanism comprises a matching push rod and at least one clamping block, the matching push rod can be arranged at the front end and the rear end of the lower bearing part in a left-right movable mode, at least one clamping hole is longitudinally formed in the matching push rod in a penetrating mode according to the interval distance, the clamping block corresponds to the matching push rod and is arranged at the front end and the rear end of the upper bearing part, and the clamping block is clamped into the clamping hole, so that the upper bearing part and the lower bearing part are connected.
Preferably, the front end and the rear end of the middle part of the clamping block are concavely provided with clamping ends, the clamping block is in an I shape, the clamping block Kong Fen is a left half part and a right half part, the aperture of the left half part of the clamping hole is larger than that of the right half part of the clamping hole, the aperture of the right half part of the clamping hole is consistent with the width of the clamping ends, and after the middle part of the clamping block is inserted into the left half part of the clamping hole, the matched push rod moves leftwards, and the middle part of the clamping block enters into the right half part of the clamping hole, so that the upper bearing part is clamped on the lower bearing part.
The liquid injection method implemented by the liquid injection device such as the liquid injection machine comprises the following steps:
firstly, loading a battery to be injected into a battery storage bin, and then installing an upper bearing part on a lower bearing part and connecting and fixing the upper bearing part through a buckling mechanism;
step two, moving the liquid injection machine to the upper part of the liquid injection assembly, and injecting electrolyte into the liquid injection assembly;
step three, connecting a dual-purpose air pump into the pressurizing pipe, and simultaneously pressurizing the liquid injection assembly and the battery storage bin;
and step four, after the liquid injection process is finished, the pressure relief valve is opened, gas in the liquid injection assembly and the battery storage bin is automatically discharged, the pressure intensity is restored to a normal pressure state, the upper bearing part and the lower bearing part are separated, and the battery is taken out.
Preferably, the upper surface of the confluence plate is provided with at least one first air inlet hole and at least one second air inlet hole, the pressurizing pipe is arranged on the first air inlet hole and the second air inlet hole, a first air guide groove and a second air guide groove which are adjacent and are not communicated are arranged in the confluence plate, the first air inlet hole and the first air guide groove are communicated to form a first air guide part, the first air guide part is communicated with each liquid injection assembly, the second air inlet hole and the second air guide groove are communicated to form a second air guide part, and the second air guide part is communicated with each air guide pipe;
in the third step, the number of the pressurizing pipes is four, the number of the first air inlets and the second air inlets are two, the first air inlets and the second air inlets are arranged at intervals, the first pressurizing pipe and the third pressurizing pipe are arranged on the second air inlets to pressurize the battery storage bin, and the second pressurizing pipe and the fourth pressurizing pipe are arranged on the first air inlets to pressurize the liquid injection assembly.
Preferably, in the third step, the pressure of 0-0.5 Mpa is gradually added in the liquid injection assembly, and when the pressure in the liquid injection assembly reaches 0.1Mpa, the pressure of 0-0.5 Mpa is added in the battery storage bin, so that the internal pressure and the external pressure of the battery are synchronously increased.
The beneficial effects of the invention are as follows: according to the invention, the liquid injection assembly is pressurized step by step, and the battery storage bin is pressurized, so that the pressure difference exists between the liquid injection assembly and the battery storage bin, and the liquid injection efficiency is increased on the premise of ensuring that the surface of the battery is not expanded and deformed, thereby improving the production quality of the battery.
The invention will be further described with reference to the drawings and examples.
Drawings
FIG. 1 is a schematic diagram of the structure of the present invention;
FIG. 2 is a schematic view of a bus plate according to the present invention;
FIG. 3 is a cross-sectional view of an infusion assembly of the present invention;
FIG. 4 is a rear view of the present invention;
FIG. 5 is a schematic view of the structure of the upper bearing part in the present invention;
fig. 6 is a schematic structural view of the lower bearing part in the present invention.
Detailed Description
As shown in fig. 1 to 6, in this embodiment, an isobaric liquid injection device of a liquid injection machine includes an upper bearing part 2 and a lower bearing part 3 connected by a fastening mechanism 1, a bus plate 20 is disposed at the top of the upper bearing part 2, at least two pressurizing pipes 200 are longitudinally disposed at the upper end of the bus plate 20 in a communicating manner at intervals, at least one liquid injection component 21 is longitudinally disposed at the upper bearing part 2 at intervals, the liquid injection component 21 penetrates through the bus plate 20 and is communicated with the bus plate 20, a battery storage bin 30 is disposed on the lower bearing part 3 corresponding to the liquid injection component 21, and a gas guide pipe 22 is disposed between the bus plate 20 and the battery storage bin 30 and is located at the rear side of the liquid injection component 21.
In this embodiment, at least one first air inlet 201 and one second air inlet 202 are disposed on the upper surface of the manifold 20, the pressurizing pipe 200 is disposed on the first air inlet 201 and the second air inlet 202, a first air guide groove and a second air guide groove 203 which are adjacent and not communicated are disposed in the manifold 20, the first air inlet 201 and the first air guide groove are communicated to form a first air guide part, the first air guide part is communicated with each injection component 21, and the second air inlet 202 and the second air guide groove 203 are communicated to form a second air guide part, and the second air guide part is communicated with each air guide pipe 22.
Specifically, the first air guide part and the second air guide part are mutually independent and do not interfere with each other, so that the pressure control of the battery storage bin 30 and the liquid injection cup can be accurately realized, and the pressure control precision is improved.
In this embodiment, the liquid injection assembly 21 includes a liquid injection cup 210 and a liquid injection prop 211 disposed in the center of the liquid injection cup 210 in a vertically moving manner, a liquid chamber 2100 is disposed in the liquid injection cup 210, at least one air vent 2101 communicating with the busbar 20 and the liquid chamber 2100 is disposed at the upper end of the liquid injection cup 210, the liquid injection prop 211 includes an injection portion 2110 and a prop rod 2111 connected with each other, the upper end of the injection portion 2110 extends out of the liquid injection cup 210 and penetrates through the busbar 20, an injection groove 2110A is longitudinally disposed in the center of the injection portion 2110, liquid injection holes 2111A are obliquely disposed at the top of the prop rod 2111 obliquely downward toward both sides, the injection grooves 2110A and the liquid chambers 2100 are communicated through the liquid injection holes 2111A, and a sealing ring 2111B for sealing the liquid outlet of the liquid injection cup 210 is disposed at the bottom of the prop rod 2111.
Specifically, sealing ring 2111B enhances the sealing ability of injection plunger 2111 so that electrolyte in injection cup 210 does not leak into the cell.
In this embodiment, an annular boss is formed on the periphery of the injection portion 2110 in a protruding manner, and a first spring 2110B and a second spring 2110C are respectively disposed on the upper side and the lower side of the annular boss.
Specifically, fixing plates capable of moving up and down are arranged on the four adjacent liquid injection cups 210, the fixing plates and the annular boss are connected through a first spring 2110B, a cylinder shaft of a driving cylinder is downwards connected with the fixing plates, when liquid is injected, a liquid injection gun of a liquid injection machine is aligned to a liquid injection top column 211 of the liquid injection cup 210, the cylinder shaft of the driving cylinder is downwards, a second spring 2110C is compressed, at the moment, the liquid injection top column 211 seals a liquid outlet of the liquid injection cup 210, and the liquid injection machine injects electrolyte from an injection part 2110 of the liquid injection top column 211; after the liquid injection is completed, the liquid injection gun is moved away, the cylinder of the driving cylinder is axially moved upwards, the liquid injection prop 211 is driven to move upwards, the first spring 2110B is compressed, the liquid outlet of the liquid injection cup 210 is opened, electrolyte flows into the battery from the liquid outlet to be injected, after the liquid injection is completed, the first spring 2110B and the second spring 2110C are reset, and the liquid outlet is sealed by the liquid injection prop 211.
In this embodiment, at least one positioning pin 23 is disposed on the lower end surfaces of the left and right ends of the upper bearing portion 2, a positioning insertion platform 31 is disposed at the left and right ends of the lower bearing portion 3 corresponding to the positioning pin 23, an insertion hole 310 is longitudinally disposed through the positioning insertion platform 31, and the positioning pin 23 is inserted into the insertion hole 310.
Specifically, the positioning pins 23 and the insertion holes 310 can ensure the fitting accuracy of the upper and lower bearing portions 2, 3.
In this embodiment, the buckling mechanism 1 includes a mating push rod 10 and at least one clamping block 11, the mating push rod 10 is movably disposed at the front end and the rear end of the lower bearing portion 3, at least one clamping hole 100 is longitudinally penetrating through the mating push rod 10 at a spacing distance, the clamping block 11 is disposed at the front end and the rear end of the upper bearing portion 2 corresponding to the mating push rod 10, and the clamping block 11 is clamped into the clamping hole 100, so that the upper bearing portion 2 and the lower bearing portion 3 are connected.
Specifically, one end of the matched push rod 10 is connected with a limit clamping block 11,
in this embodiment, the front end and the rear end of the middle portion of the clamping block 11 are concavely formed with a clamping end 110, and the clamping block 11 is in an "i" shape, the clamping hole 100 is divided into a left half portion and a right half portion, the aperture of the left half portion of the clamping hole 100 is larger than the aperture of the right half portion of the clamping hole 100, the aperture of the right half portion of the clamping hole 100 is consistent with the width of the clamping end 110, when the middle portion of the clamping block 11 is inserted into the left half portion of the clamping hole 100, the matching push rod 10 moves leftwards, the middle portion of the clamping block 11 enters into the right half portion of the clamping hole 100, so that the upper bearing portion 2 is clamped on the lower bearing portion 3.
Specifically, the number of battery storage bins 30 is eight, and a storage seat is provided in each battery storage bin 30, which can be used for fixedly positioning the battery.
The liquid injection method implemented by the liquid injection device such as the liquid injection machine comprises the following steps:
firstly, filling a battery to be filled with liquid into a battery storage bin 30, and then installing an upper bearing part 2 on a lower bearing part 3 and connecting and fixing the upper bearing part with a buckling mechanism 1;
step two, the liquid injection machine is moved to the position above the liquid injection assembly 21, and electrolyte is injected into the liquid injection assembly 21;
step three, a dual-purpose air pump is connected into the pressurizing pipe 200, and simultaneously the liquid injection assembly 21 and the battery storage bin 30 are pressurized;
and step four, after the liquid injection process is finished, the gas in the liquid injection assembly 21 and the battery storage bin 30 is sucked out simultaneously by the dual-purpose gas pump, so that the pressure intensity is restored to a normal pressure state, the upper bearing part 2 and the lower bearing part 3 are separated, and the battery is taken out.
In this embodiment, at least one first air inlet 201 and one second air inlet 202 are disposed on the upper surface of the manifold 20, the pressurizing pipe 200 is disposed on the first air inlet 201 and the second air inlet 202, a first air guide groove and a second air guide groove 203 which are adjacent and not communicated are disposed in the manifold 20, the first air inlet 201 and the first air guide groove are communicated to form a first air guide part, the first air guide part is communicated with each injection component 21, and the second air inlet 202 and the second air guide groove 203 are communicated to form a second air guide part, and the second air guide part is communicated with each air guide pipe 22;
in the third step, the number of the pressurizing pipes 200 is four, the number of the first air inlet holes 201 and the second air inlet holes 202 is two, the first air inlet holes 201 and the second air inlet holes 202 are arranged at intervals, the first pressurizing pipe 200 and the third pressurizing pipe 200 are arranged on the second air inlet holes 202 to pressurize the battery storage bin 30, and the second pressurizing pipe 200 and the fourth pressurizing pipe 200 are arranged on the first air inlet holes 201 to pressurize the liquid injection assembly 21.
In the third embodiment, the pressure of 0-0.5 Mpa is gradually applied to the liquid injection assembly 21, and when the pressure in the liquid injection assembly 21 reaches 0.1Mpa, the pressure of 0-0.5 Mpa is applied to the battery storage bin 30, so that the internal pressure and the external pressure of the battery are synchronously increased.
The invention increases the liquid injection efficiency on the premise of ensuring that the surface of the battery is not expanded and deformed by gradually pressurizing the liquid injection component 21 and pressurizing the liquid injection component in the battery storage bin 30 so that the pressure difference exists between the liquid injection component 21 and the battery storage bin 30, thereby improving the production quality of the battery.
The above description is only of the preferred embodiment of the present invention, and is not intended to limit the present invention in any way. Any person skilled in the art can make many possible variations and modifications to the technical solution of the present invention or modifications to equivalent embodiments using the methods and technical contents disclosed above, without departing from the scope of the technical solution of the present invention. Therefore, all equivalent changes according to the shape, structure and principle of the present invention are covered in the protection scope of the present invention.
Claims (8)
1. The isobaric priming device of annotate liquid machine, its characterized in that: the device comprises an upper bearing part and a lower bearing part which are connected through a buckling mechanism, wherein a bus plate is arranged at the top of the upper bearing part, at least two pressurizing pipes are longitudinally communicated with the upper end of the bus plate according to a spacing distance, at least one liquid injection component is longitudinally arranged on the upper bearing part according to a spacing distance, the liquid injection component penetrates through the bus plate and is communicated with the bus plate, a battery storage bin is arranged on the lower bearing part corresponding to the liquid injection component, the bus plate is communicated with the battery storage bin through an air duct, and the air duct is positioned at the rear side of the liquid injection component;
at least one positioning pin is respectively arranged on the lower end surfaces of the left end and the right end of the upper bearing part, a positioning insertion platform is arranged at the left end and the right end of the lower bearing part corresponding to the positioning pin, an insertion hole is longitudinally formed in the positioning insertion platform in a penetrating manner, and the positioning pin is inserted into the insertion hole;
the buckling mechanism comprises a matched push rod and at least one clamping block, the matched push rod can be arranged at the front end and the rear end of the lower bearing part in a left-right movable mode, at least one clamping hole is longitudinally formed in the matched push rod in a penetrating mode according to the interval distance, the clamping block corresponds to the matched push rod and is arranged at the front end and the rear end of the upper bearing part, and the clamping block is clamped into the clamping hole, so that the upper bearing part and the lower bearing part are connected.
2. The isobaric liquid injection device of the liquid injection machine according to claim 1, wherein at least one first air inlet hole and at least one second air inlet hole are formed in the upper surface of the confluence plate, the pressurizing pipe is arranged on the first air inlet hole and the second air inlet hole, a first air guide groove and a second air guide groove which are adjacent and are not communicated are formed in the confluence plate, the first air inlet hole and the first air guide groove are communicated to form a first air guide part, the first air guide part is communicated with each liquid injection assembly, the second air inlet hole and the second air guide groove are communicated to form a second air guide part, and the second air guide part is communicated with each air guide pipe.
3. The isobaric liquid injection device of the liquid injection machine according to claim 1, characterized in that the liquid injection assembly comprises a liquid injection cup and a liquid injection jack post which is arranged in the center of the liquid injection cup in an up-and-down moving way, a liquid bin is arranged in the liquid injection cup, at least one vent hole which is communicated with the bus plate and the liquid bin is arranged at the upper end of the liquid injection cup, the liquid injection jack post comprises an injection part and a push rod which are mutually connected, the upper end of the injection part extends out of the liquid injection cup and penetrates through the bus plate, an injection groove is longitudinally penetrated in the center of the injection part, liquid injection holes are obliquely downwards arranged at the top of the push rod towards two sides, the injection groove and the liquid bin are communicated through the liquid injection holes, and a sealing ring for sealing a liquid outlet of the liquid injection cup is arranged at the bottom of the push rod in a surrounding way.
4. The isopiestic liquid injection device of the liquid injection machine according to claim 3, wherein the peripheral edge of the injection part is provided with an annular boss, and the upper side and the lower side of the annular boss are respectively provided with a first spring and a second spring.
5. The isopiestic liquid injection device of the liquid injection machine according to claim 1, wherein the front end and the rear end of the middle part of the clamping block are concavely provided with clamping ends, the clamping block is in an 'I' -shape, the clamping block Kong Fen is a left half part and a right half part, the aperture of the left half part of the clamping hole is larger than that of the right half part of the clamping hole, the aperture of the right half part of the clamping hole is consistent with the width of the clamping ends, after the middle part of the clamping block is inserted into the left half part of the clamping hole, the matched push rod moves leftwards, the middle part of the clamping block enters the right half part of the clamping hole, and the upper bearing part is clamped on the lower bearing part.
6. A method of priming an isopiestic priming device of claim 1, comprising the steps of:
firstly, loading a battery to be injected into a battery storage bin, and then installing an upper bearing part on a lower bearing part and connecting and fixing the upper bearing part through a buckling mechanism;
step two, moving the liquid injection machine to the upper part of the liquid injection assembly, and injecting electrolyte into the liquid injection assembly;
step three, connecting a dual-purpose air pump into the pressurizing pipe, and simultaneously pressurizing the liquid injection assembly and the battery storage bin;
and step four, after the liquid injection process is finished, the pressure relief valve is opened, gas in the liquid injection assembly and the battery storage bin is automatically discharged, the pressure intensity is restored to a normal pressure state, the upper bearing part and the lower bearing part are separated, and the battery is taken out.
7. The method according to claim 6, wherein at least one first air inlet hole and one second air inlet hole are formed in the upper surface of the confluence plate, the pressurizing pipe is arranged on the first air inlet hole and the second air inlet hole, a first air guide groove and a second air guide groove which are adjacent and are not communicated are formed in the confluence plate, the first air inlet hole and the first air guide groove are communicated to form a first air guide part, the first air guide part is communicated with each liquid injection assembly, the second air inlet hole and the second air guide groove are communicated to form a second air guide part, and the second air guide part is communicated with each air guide pipe;
in the third step, the number of the pressurizing pipes is four, the number of the first air inlets and the second air inlets are two, the first air inlets and the second air inlets are arranged at intervals, the first pressurizing pipe and the third pressurizing pipe are arranged on the second air inlets to pressurize the battery storage bin, and the second pressurizing pipe and the fourth pressurizing pipe are arranged on the first air inlets to pressurize the liquid injection assembly.
8. The method of filling liquid according to claim 6, wherein in the third step, the pressure of 0-0.5 Mpa is gradually applied to the liquid filling assembly, and when the pressure in the liquid filling assembly reaches 0.1Mpa, the pressure of 0-0.5 Mpa is applied to the battery storage compartment, so that the pressure of the liquid filling assembly and the battery storage compartment are synchronously increased.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910166171.4A CN109713210B (en) | 2019-03-06 | 2019-03-06 | Isobaric liquid injection device and method of liquid injection machine |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910166171.4A CN109713210B (en) | 2019-03-06 | 2019-03-06 | Isobaric liquid injection device and method of liquid injection machine |
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| CN109713210B true CN109713210B (en) | 2023-07-07 |
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| CN113451717A (en) * | 2021-06-29 | 2021-09-28 | 深圳市铂纳特斯自动化科技有限公司 | Negative-pressure liquid injection device and method for effectively preventing battery deformation |
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