CN213875952U - Triggering battery core thermal runaway air leakage measuring device - Google Patents
Triggering battery core thermal runaway air leakage measuring device Download PDFInfo
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- CN213875952U CN213875952U CN202022352220.4U CN202022352220U CN213875952U CN 213875952 U CN213875952 U CN 213875952U CN 202022352220 U CN202022352220 U CN 202022352220U CN 213875952 U CN213875952 U CN 213875952U
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Abstract
The utility model discloses a trigger electric core thermal runaway measuring device that loses heart, include: the sealed container is provided with a power supply interface, a barometer, an air inlet valve and an air outlet valve; the acupuncture device, acupuncture device include mount, slider, puncture needle and be used for the fixed mounting of electric core, and the mount includes upper fixed plate, bottom plate and sets up the guide rail between upper fixed plate and bottom plate, slider and guide rail sliding connection are equipped with on the upper fixed plate and are used for controlling the gliding control of slider, are equipped with on the mounting to be used for supplying to puncture the perforation that the needle inserted to. The device of the utility model is simple in structure, easily operation, with low costs, can satisfy under inert atmosphere or air atmosphere, carry out acupuncture thermal runaway test to the lithium ion battery of different material systems and specification to can carry out real-time recording to the important characteristic parameter of thermal runaway in-process, collect the thermal runaway result, but wide application in battery safety technical field.
Description
Technical Field
The application relates to the technical field of battery safety, in particular to a triggering electric core thermal runaway air leakage measuring device.
Background
In recent years, frequent fire accidents of electric vehicles cause worry about safety of the electric vehicles. The electric automobile comprises a large number of batteries, and once thermal runaway occurs, a large amount of heat is released in a short time, and a large amount of toxic combustible smoke is released along with rupture. Leakage of toxic gases into the passenger compartment would seriously jeopardize the life safety of the passengers.
Through monitoring the pressure of released gas in the thermal runaway process of the power battery and collecting and analyzing the gas, theoretical analysis basis can be provided for the size design of a battery explosion-proof valve, the design of a PACK and a pressure release valve of a system, and the design of a thermal runaway early warning and fire extinguishing scheme. The prior art adopts a heating or overcharging mode to trigger the thermal runaway of the battery, but the thermal runaway cannot be triggered in a needling mode. In the prior art, a needling mode is adopted to trigger the thermal runaway of the battery core and detect the thermal runaway, but the detection device is complex in design and high in maintenance cost.
SUMMERY OF THE UTILITY MODEL
In order to solve one of the above technical problems, an object of the present application is to provide a device for triggering a cell thermal runaway deflation measurement.
The technical scheme adopted by the application is as follows:
the utility model provides a trigger electric core thermal runaway measuring device that loses heart, includes:
the sealed container is provided with a power supply interface, a barometer, an air inlet valve and an air outlet valve;
the acupuncture device, the acupuncture device includes the mount, the slider, prick the needle and be used for the mounting of fixed electric core, the mount includes an upper fixed plate, the bottom plate and sets up the guide rail between an upper fixed plate and the bottom plate, slider and guide rail sliding connection are equipped with on the upper fixed plate and are used for the gliding control of control slider, be equipped with on the mounting and be used for supplying to prick the perforation that the needle inserted to, through the motion of control slider, make to prick the needle and prick electric core.
Further, the fixing piece is fixed on the lower fixing plate, and the puncture needle is fixed on the sliding block.
Further, the fixing member is fixed to the lower fixing plate, and the piercing needle is placed on the through hole.
Further, the fixing member is installed on the slider, and the piercing needle is fixed on the lower fixing plate.
Further, the fixing member is mounted on the slider, and the piercing pin is caught on the piercing hole.
Further, the control part comprises a heater and a fixing band, the fixing band is used for binding the sliding block, and the heater is used for fusing the fixing band.
Further, the heater is shaped like a rod or a cylinder.
Furthermore, the control part is an electromagnet, and the sliding block is made of magnetic materials or is provided with an adsorption part made of magnetic materials.
Further, the diameter of the perforation coincides with the diameter of the piercing needle.
Furthermore, the length of the puncture needle is 1.5 to 3 times of the thickness of the battery core.
The beneficial effect of this application is: the utility model provides a trigger electric core thermal runaway measuring device that loses heart, includes: the sealed container is provided with a power supply interface, a barometer, an air inlet valve and an air outlet valve; the acupuncture device, the acupuncture device includes the mount, the slider, prick the needle and be used for the mounting of fixed electric core, the mount includes an upper fixed plate, the bottom plate and sets up the guide rail between an upper fixed plate and the bottom plate, slider and guide rail sliding connection are equipped with on the upper fixed plate and are used for the gliding control of control slider, be equipped with on the mounting and be used for supplying to prick the perforation that the needle inserted to, through the motion of control slider, make to prick the needle and prick electric core. The device has the advantages of simple structure, easy operation and low cost, can meet the requirement of carrying out acupuncture thermal runaway tests on lithium ion batteries of different material systems and specifications under inert atmosphere or air atmosphere, can record important characteristic parameters in the thermal runaway process in real time, and collects thermal runaway products.
Drawings
The above and/or additional aspects and advantages of the present application will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
fig. 1 is a schematic diagram of a first implementation manner of a triggering cell thermal runaway deflation measuring device according to an embodiment of the present application;
fig. 2 is a schematic diagram of a second implementation manner of a triggering cell thermal runaway deflation measuring device according to an embodiment of the present application;
fig. 3 is a schematic diagram of a third implementation manner of a triggering cell thermal runaway deflation measuring device according to an embodiment of the present application;
fig. 4 is a schematic diagram of a fourth implementation manner of the apparatus for triggering cell thermal runaway venting measurement according to the embodiment of the present application;
fig. 5 is a schematic diagram of a fifth implementation manner of the apparatus for triggering cell thermal runaway deflation measurement in the embodiment of the present application.
Detailed Description
Reference will now be made in detail to the present embodiments of the present application, preferred embodiments of which are illustrated in the accompanying drawings, which are for the purpose of visually supplementing the description with figures and detailed description, so as to enable a person skilled in the art to visually and visually understand each and every feature and technical solution of the present application, but not to limit the scope of the present application.
In the description of the present application, it is to be understood that the positional descriptions, such as the directions of up, down, front, rear, left, right, etc., referred to herein are based on the directions or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, and do not indicate or imply that the referred device or element must have a specific direction, be constructed and operated in a specific direction, and thus, should not be construed as limiting the present application.
In the description of the present application, the meaning of a plurality is one or more, the meaning of a plurality is two or more, and larger, smaller, larger, etc. are understood as excluding the present number, and larger, smaller, inner, etc. are understood as including the present number. If the first and second are described for the purpose of distinguishing technical features, they are not to be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated.
In the description of the present application, unless otherwise expressly limited, terms such as set, mounted, connected and the like should be construed broadly, and those skilled in the art can reasonably determine the specific meaning of the terms in the present application by combining the detailed contents of the technical solutions.
Example 1
Referring to fig. 1, the present embodiment provides a device for measuring a thermal runaway bleed of a trigger battery 300, including:
the air-conditioning system comprises a sealed container 100, wherein the sealed container 100 is provided with a power supply interface 101, a barometer 102, an air inlet valve and an air outlet valve 103;
the acupuncture device comprises a fixed frame, a sliding block 204, an acupuncture needle 206 and a fixed piece 301 for fixing the electric core 300, wherein the fixed frame comprises an upper fixed plate 202, a lower fixed plate 207 and a guide rail 205 arranged between the upper fixed plate 202 and the lower fixed plate 207, the sliding block 204 is in sliding connection with the guide rail 205, a control piece for controlling the sliding of the sliding block 204 is arranged on the upper fixed plate 202, a through hole 302 for inserting the acupuncture needle 206 is arranged on the fixed piece 301, and the acupuncture needle 206 punctures the electric core 300 by controlling the movement of the sliding block 204;
the fixing member 301 is fixed to the lower fixing plate 207, and the piercing needle 206 is seated on the piercing hole 302;
the control part is an electromagnet 208, the sliding block 204 is made of magnetic materials or the sliding block 204 is provided with an adsorption part made of magnetic materials.
In this embodiment, the sealed container 100 is a reaction site of the battery or the battery cell 300, inert gas or other gases can be input through the air inlet valve, gases in the sealed container 100 can be output through the air outlet valve, power is supplied to the control part through the power interface 101, and the barometer 102 is used for measuring and displaying a pressure value in the sealed container 100. The working principle of the device is as follows: the battery cell 300 is fixed on the fixing member 301, the electromagnet 208 is powered on, and at the moment, the sliding block 204 is adsorbed on the upper fixing plate 202. After the power of the electromagnet 208 is cut off, the electromagnet 208 loses magnetism, and the sliding block 204 slides along the guide rail 205 under the action of gravity and strikes the piercing needle 206 to pierce the battery cell 300. The sliding block 204 is made of high-density materials, the preferred mass is 1-50 kg, and materials such as stainless steel, alloy steel and cast iron can be adopted. The piercing needle 206 is made of a metal material, such as stainless steel, alloy steel, and cast iron. The device can puncture the battery cell 300 by adopting simple structures such as the electromagnet 208 and the like for control, is easy to control and operate, and greatly reduces the cost.
The method is characterized in that a needling thermal runaway exhaust triggering test experiment is carried out on a lithium battery monomer, and the operation is carried out according to the following steps:
in a charging mode of CC-CV (constant current-constant voltage charging mode) under the environment of 25 +/-2 ℃, the power battery is charged to 4.1V at a constant current of 1C (6.2A) and is converted into constant voltage charging to 0.05C (0.31A) of cut-off current, and then the charging is stopped. Fixing a full-electric power battery on a fixture (namely a fixing piece 301), placing the full-electric power battery into a sealed container 100, introducing inert gas (N2), exhausting air, disconnecting an external power supply, losing magnetic force of an electromagnet 208, enabling a sliding block 204 to fall freely, enabling an impact steel needle (namely a piercing needle 206) to pierce into an electric core 300, observing for 1h, collecting thermal runaway gas, and performing gas composition analysis.
Example 2
Referring to fig. 2, the present embodiment provides a device for measuring a thermal runaway bleed of a trigger battery 300, including:
the air-conditioning system comprises a sealed container 100, wherein the sealed container 100 is provided with a power supply interface 101, a barometer 102, an air inlet valve and an air outlet valve 103;
the acupuncture device comprises a fixed frame, a sliding block 204, an acupuncture needle 206 and a fixed piece 301 for fixing the electric core 300, wherein the fixed frame comprises an upper fixed plate 202, a lower fixed plate 207 and a guide rail 205 arranged between the upper fixed plate 202 and the lower fixed plate 207, the sliding block 204 is in sliding connection with the guide rail 205, a control piece for controlling the sliding of the sliding block 204 is arranged on the upper fixed plate 202, a through hole 302 for inserting the acupuncture needle 206 is arranged on the fixed piece 301, and the acupuncture needle 206 punctures the electric core 300 by controlling the movement of the sliding block 204;
the fixing member 301 is fixed to the lower fixing plate 207, and the piercing needle 206 is seated on the piercing hole 302;
the control member includes a heater 201 and a fixing band 203, the fixing band 203 is used for binding a slider 204, and the heater 201 is used for fusing the fixing band 203.
The heater 201 is shaped like a rod or a cylinder having a small specific surface area, and can rapidly heat the fixing band 203, reduce the heating of the air in the sealed box, and reduce the energy loss.
In this embodiment, the sealed container 100 is a reaction site of the battery or the battery cell 300, inert gas or other gases can be input through the air inlet valve, gases in the sealed container 100 can be output through the air outlet valve, power is supplied to the control part through the power interface 101, and the barometer 102 is used for measuring and displaying a pressure value in the sealed container 100. The working principle of the device is as follows: adopt fixed band 203 to fix slider 204 on upper fixed plate 202, fixed band 203 is the hot melt material (melting temperature < 300 ℃), can be chemical plastics such as PE (polyethylene), PP (polypropylene), ABS (acrylonitrile butadiene styrene copolymer), nylon, also can be natural fiber material such as cotton-flax, heater 201 heats fixed band 203 during the test, after the temperature reached the melting temperature, fixed band 203 broke off, slider 204 slided along guide rail 205 under the effect of gravity to striking puncture needle 206 punctures electric core 300. The sliding block 204 is made of high-density materials, the preferred mass is 1-50 kg, and materials such as stainless steel, alloy steel and cast iron can be adopted. The device can realize the puncture of the battery cell 300 by adopting simple structures such as the heater 201, the fixing belt 203 and the like, is easy to control and operate, and greatly reduces the cost.
The method is characterized in that a needling thermal runaway exhaust triggering test experiment is carried out on a lithium battery monomer, and the operation is carried out according to the following steps:
in a charging mode of CC-CV (constant current-constant voltage charging mode) under the environment of 25 +/-2 ℃, the power battery is charged to 4.1V at a constant current of 1C (6.2A) and is converted into constant voltage charging to 0.05C (0.31A) of cut-off current, and then the charging is stopped. Fixing the full-state power battery on a fixture (namely a fixing piece 301), and putting the fixture into a sealIn the vessel 100, an inert gas (N) is introduced2) The heater 201(1kW) is started, the fixing band 203 is fused, the slider 204 falls freely, the impact steel needle (namely, the puncture needle 206) pierces the battery cell 300, the heating is stopped immediately after the thermal runaway of the battery cell 300 is triggered, 1h is observed, the thermal runaway gas is collected, and the gas composition analysis is carried out.
Example 3
Referring to fig. 3, the present embodiment provides a device for triggering measurement of thermal runaway gas leakage of a battery cell 300, including:
the air-conditioning system comprises a sealed container 100, wherein the sealed container 100 is provided with a power supply interface 101, a barometer 102, an air inlet valve and an air outlet valve 103;
the acupuncture device comprises a fixed frame, a sliding block 204, an acupuncture needle 206 and a fixed piece 301 for fixing the electric core 300, wherein the fixed frame comprises an upper fixed plate 202, a lower fixed plate 207 and a guide rail 205 arranged between the upper fixed plate 202 and the lower fixed plate 207, the sliding block 204 is in sliding connection with the guide rail 205, a control piece for controlling the sliding of the sliding block 204 is arranged on the upper fixed plate 202, a through hole 302 for inserting the acupuncture needle 206 is arranged on the fixed piece 301, and the acupuncture needle 206 punctures the electric core 300 by controlling the movement of the sliding block 204;
the fixing piece 301 is fixed on the lower fixing plate 207, and the puncture needle 206 is fixed on the sliding block 204;
the control element comprises a heater 201 and a fixing band 203, the fixing band 203 is used for binding a sliding block 204, and the heater 201 is used for fusing the fixing band 203;
the heater 201 has a rod-like or cylindrical shape.
Embodiment 3 is similar to the working principle of embodiment 2, in embodiment 3, the puncturing needle 206 is fixed on the sliding block 204, and when the fixing band 203 is blown by heating of the heater 201, the puncturing needle 206 follows the sliding block 204 to move under the action of gravity to puncture the battery cell 300. In example 3, the heater 201 is preferably rod-like or cylindrical in shape having a small specific surface area, and can heat the fixing band 203 quickly, and also reduce the heating of the air in the sealed box and the energy loss.
Example 4
Referring to fig. 4, the present embodiment provides a device for triggering measurement of thermal runaway gas leakage of a battery cell 300, including:
the air-conditioning system comprises a sealed container 100, wherein the sealed container 100 is provided with a power supply interface 101, a barometer 102, an air inlet valve and an air outlet valve 103;
the acupuncture device comprises a fixed frame, a sliding block 204, an acupuncture needle 206 and a fixed piece 301 for fixing the electric core 300, wherein the fixed frame comprises an upper fixed plate 202, a lower fixed plate 207 and a guide rail 205 arranged between the upper fixed plate 202 and the lower fixed plate 207, the sliding block 204 is in sliding connection with the guide rail 205, a control piece for controlling the sliding of the sliding block 204 is arranged on the upper fixed plate 202, a through hole 302 for inserting the acupuncture needle 206 is arranged on the fixed piece 301, and the acupuncture needle 206 punctures the electric core 300 by controlling the movement of the sliding block 204;
the fixing piece 301 is arranged on the sliding block 204, and the puncture needle 206 is fixed on the lower fixing plate 207;
the control element comprises a heater 201 and a fixing band 203, the fixing band 203 is used for binding a sliding block 204, and the heater 201 is used for fusing the fixing band 203;
the heater 201 has a rod-like or cylindrical shape.
Embodiment 4 is similar to the working principle of embodiment 2, in embodiment 4, the piercing needle 206 is fixed on the lower fixing plate 207, the fixing member 301 moves along with the sliding block 204, and when the fixing member 301 hits the lower fixing plate 207 and the fixing member 203 is melted by the heater 201, the piercing needle 206 pierces the battery cell 300 through the perforation 302. The heater 201 is preferably rod-shaped or cylindrical with a small specific surface area, and can heat the fixing band 203 quickly, reduce heating of air in the sealed box, and reduce energy loss.
In the case of the example 5, the following examples were conducted,
referring to fig. 5, the present embodiment provides a device for triggering measurement of thermal runaway gas leakage of a battery cell 300, including:
the air-conditioning system comprises a sealed container 100, wherein the sealed container 100 is provided with a power supply interface 101, a barometer 102, an air inlet valve and an air outlet valve 103;
the acupuncture device comprises a fixed frame, a sliding block 204, an acupuncture needle 206 and a fixed piece 301 for fixing the electric core 300, wherein the fixed frame comprises an upper fixed plate 202, a lower fixed plate 207 and a guide rail 205 arranged between the upper fixed plate 202 and the lower fixed plate 207, the sliding block 204 is in sliding connection with the guide rail 205, a control piece for controlling the sliding of the sliding block 204 is arranged on the upper fixed plate 202, a through hole 302 for inserting the acupuncture needle 206 is arranged on the fixed piece 301, and the acupuncture needle 206 punctures the electric core 300 by controlling the movement of the sliding block 204;
the fixing piece 301 is arranged on the sliding block 204, and the puncturing needle 206 is clamped on the through hole 302;
the control element comprises a heater 201 and a fixing band 203, the fixing band 203 is used for binding a sliding block 204, and the heater 201 is used for fusing the fixing band 203;
the heater 201 has a rod-like or cylindrical shape.
Embodiment 5 operates on a similar principle to embodiment 2, in embodiment 4, the piercing needle 206 is stuck to the perforation 302, and specifically, the piercing needle 206 may be magnetically attached to the perforation 302, or an elastic member may be used to fix the piercing needle 206 in the perforation 302. When the fixing band 203 is broken, the fixing member 301 moves along with the slider 204, and when the lower fixing plate 207 is impacted, the piercing needle 206 is impacted to pierce the battery cell 300. The heater 201 is preferably rod-shaped or cylindrical with a small specific surface area, and can heat the fixing band 203 quickly, reduce heating of air in the sealed box, and reduce energy loss.
Further as an optional embodiment, the sliding distance of the sliding block 204 is preferably 10-50 cm. So can ensure that the electricity core is punctureed by the puncture needle.
Further as an alternative embodiment, the diameter of the perforation 302 coincides with the diameter of the piercing needle 206.
In this embodiment, the fixing member 301 is a clamp, and a through hole 302 is formed in the center of the clamp, and the diameter of the through hole 302 is equivalent to the diameter of the piercing needle 206, i.e. the diameter of the through hole 302 is slightly larger than the diameter of the piercing needle 206, so as to ensure that the piercing needle 206 can only vertically penetrate the battery downwards during the test without skewing.
Further as an alternative embodiment, the length of the piercing needle 206 is 1.5-3 times the thickness of the electrical core 300.
The piercing needle 206 is made of a high-temperature resistant stainless piercing needle 206 or a tungsten piercing needle 206, and optionally, the length of the piercing needle 206 is slightly larger than the sum of the thickness of the battery and the thickness of the clamp, so that the slider 204 has a sufficient falling space, and the length of the piercing needle is sufficient to penetrate through the battery.
In summary, the present embodiment has the following beneficial effects compared with the prior art:
(1) the device for researching the thermal runaway danger of the lithium ion battery can be carried out by the embodiment, the important characteristic parameters in the thermal runaway process can be recorded in real time, and meanwhile, the thermal runaway product can be collected for detection.
(2) The thermal runaway test can be carried out on the lithium ion batteries with different material systems and specifications.
(3) The embodiment can carry out the acupuncture to lithium ion battery and trigger the thermal runaway test, and can provide two kinds of test conditions of air and inert gas atmosphere.
(4) The present embodiment is to study the change of data such as air pressure, temperature, voltage, etc. in the whole process of thermal runaway of the lithium ion battery.
While the preferred embodiments of the present invention have been described in detail, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (10)
1. The utility model provides a trigger electric core thermal runaway measuring device that loses heart which characterized in that includes:
the air inlet valve is arranged on the air inlet of the air inlet pipe, and the air outlet valve is arranged on the air inlet pipe;
the acupuncture device, the acupuncture device includes mount, slider, punctures the needle and is used for the mounting of fixed electric core, the mount includes an upper fixed plate, bottom plate and sets up an upper fixed plate with guide rail between the bottom plate, the slider with guide rail sliding connection, be equipped with on the upper fixed plate and be used for control the gliding control of slider, be equipped with on the mounting and be used for the confession puncture the perforation that the needle inserted to, through control the motion of slider makes puncture the needle puncture electric core.
2. The apparatus of claim 1, wherein the fixing member is fixed to the bottom fixing plate, and the piercing needle is fixed to the sliding block.
3. The apparatus of claim 1, wherein the fixing member is fixed to the bottom fixing plate, and the piercing needle is disposed on the through hole.
4. The apparatus of claim 1, wherein the fixing member is mounted on the sliding block, and the puncturing needle is fixed on the lower fixing plate.
5. The apparatus of claim 1, wherein the fixing member is mounted on the sliding block, and the piercing needle is clamped on the piercing hole.
6. The device according to any one of claims 1 to 5, wherein the control element comprises a heater and a fixing band, the fixing band is used for binding the sliding block, and the heater is used for fusing the fixing band.
7. The apparatus of claim 6, wherein the heater is shaped as a rod.
8. The device of any one of claims 1 to 5, wherein the control element is an electromagnet, and the slider is made of a magnetic material or provided with an adsorbing element made of a magnetic material.
9. The apparatus of claim 1, wherein the diameter of the perforation matches the diameter of the piercing needle.
10. The apparatus of claim 1, wherein the length of the piercing needle is 1.5-3 times the thickness of the cell.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022352220.4U CN213875952U (en) | 2020-10-20 | 2020-10-20 | Triggering battery core thermal runaway air leakage measuring device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022352220.4U CN213875952U (en) | 2020-10-20 | 2020-10-20 | Triggering battery core thermal runaway air leakage measuring device |
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| CN213875952U true CN213875952U (en) | 2021-08-03 |
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| CN202022352220.4U Active CN213875952U (en) | 2020-10-20 | 2020-10-20 | Triggering battery core thermal runaway air leakage measuring device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114397594A (en) * | 2022-01-17 | 2022-04-26 | 苏州清研精准汽车科技有限公司 | Battery pack detection device and application method |
| CN114597518A (en) * | 2022-03-16 | 2022-06-07 | 广汽埃安新能源汽车有限公司 | Trigger device for thermal runaway of battery |
-
2020
- 2020-10-20 CN CN202022352220.4U patent/CN213875952U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114397594A (en) * | 2022-01-17 | 2022-04-26 | 苏州清研精准汽车科技有限公司 | Battery pack detection device and application method |
| CN114597518A (en) * | 2022-03-16 | 2022-06-07 | 广汽埃安新能源汽车有限公司 | Trigger device for thermal runaway of battery |
| CN114597518B (en) * | 2022-03-16 | 2023-06-23 | 广汽埃安新能源汽车有限公司 | Triggering device for thermal runaway of battery |
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Address after: 518000 1-2 Floor, Building A, Xinwangda Industrial Park, No. 18 Tangjianan Road, Gongming Street, Guangming New District, Shenzhen City, Guangdong Province Patentee after: Xinwangda Power Technology Co.,Ltd. Address before: 518000 Xinwangda Industrial Park, No.18, Tangjia south, Gongming street, Guangming New District, Shenzhen City, Guangdong Province Patentee before: SUNWODA ELECTRIC VEHICLE BATTERY Co.,Ltd. |