CN109065961A - A kind of production method that multipoint mode internal temperature monitors integrated electrochemical cell - Google Patents
A kind of production method that multipoint mode internal temperature monitors integrated electrochemical cell Download PDFInfo
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- CN109065961A CN109065961A CN201810902496.XA CN201810902496A CN109065961A CN 109065961 A CN109065961 A CN 109065961A CN 201810902496 A CN201810902496 A CN 201810902496A CN 109065961 A CN109065961 A CN 109065961A
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 22
- 239000007772 electrode material Substances 0.000 claims abstract description 13
- 238000001514 detection method Methods 0.000 claims abstract description 5
- 238000012545 processing Methods 0.000 claims description 16
- 238000000034 method Methods 0.000 claims description 9
- 238000001259 photo etching Methods 0.000 claims description 9
- 239000000758 substrate Substances 0.000 claims description 9
- 239000012300 argon atmosphere Substances 0.000 claims description 8
- 239000004020 conductor Substances 0.000 claims description 7
- 239000000463 material Substances 0.000 claims description 7
- 238000012360 testing method Methods 0.000 claims description 7
- 230000005611 electricity Effects 0.000 claims description 4
- 239000003960 organic solvent Substances 0.000 claims description 4
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 claims description 4
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 3
- 239000004642 Polyimide Substances 0.000 claims description 3
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 3
- 229910052802 copper Inorganic materials 0.000 claims description 3
- 239000010949 copper Substances 0.000 claims description 3
- 238000007599 discharging Methods 0.000 claims description 3
- 239000005304 optical glass Substances 0.000 claims description 3
- 239000001301 oxygen Substances 0.000 claims description 3
- 229910052760 oxygen Inorganic materials 0.000 claims description 3
- 238000012536 packaging technology Methods 0.000 claims description 3
- 229920001721 polyimide Polymers 0.000 claims description 3
- 238000004528 spin coating Methods 0.000 claims description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 3
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 claims description 2
- 229910052737 gold Inorganic materials 0.000 claims description 2
- 239000010931 gold Substances 0.000 claims description 2
- 229910052697 platinum Inorganic materials 0.000 claims description 2
- 230000020411 cell activation Effects 0.000 claims 1
- 150000003233 pyrroles Chemical class 0.000 claims 1
- 238000004544 sputter deposition Methods 0.000 claims 1
- 238000012544 monitoring process Methods 0.000 abstract description 12
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 abstract description 8
- 229910052744 lithium Inorganic materials 0.000 abstract description 8
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 8
- 229910001416 lithium ion Inorganic materials 0.000 description 8
- 230000004913 activation Effects 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000003475 lamination Methods 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 208000032953 Device battery issue Diseases 0.000 description 1
- 241000580063 Ipomopsis rubra Species 0.000 description 1
- 229910012820 LiCoO Inorganic materials 0.000 description 1
- 239000004411 aluminium Substances 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000010261 cell growth Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 238000009831 deintercalation Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 239000003792 electrolyte Substances 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000003822 epoxy resin Substances 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 229910002804 graphite Inorganic materials 0.000 description 1
- 239000010439 graphite Substances 0.000 description 1
- 238000011065 in-situ storage Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000013307 optical fiber Substances 0.000 description 1
- 238000005498 polishing Methods 0.000 description 1
- 229920000647 polyepoxide Polymers 0.000 description 1
- 229910010271 silicon carbide Inorganic materials 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000001291 vacuum drying Methods 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/058—Construction or manufacture
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
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- Secondary Cells (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
Abstract
The present invention relates to the production methods that a kind of multipoint mode internal temperature monitors integrated electrochemical cell, belong to lithium battery safety monitoring field.Production method of the invention, it is first determined the region of inside battery maximum temperature in the case where different multiplying charge and discharge；Then the highest temperature region part in the electrode material of battery electrode to be produced is disposed；Flexibility temperature sensor is pasted onto the highest temperature region post package battery in electrode material again, flexibility temperature sensor draws detection interface to cell terminal.Production method of the invention realizes the integrated of flexibility temperature sensor and battery, and does not influence substantially on battery performance.
Description
Technical field
The present invention relates to the production methods that a kind of multipoint mode internal temperature monitors integrated electrochemical cell, belong to lithium battery and supervise safely
Survey field.
Background technique
Lithium battery is as a kind of clean energy resource carrier, in electricity the advantages that because of energy density height, good cycle, clean and environmental protection
The fields applications such as son communication, power continuation of the journey are more and more wider.Due to lithium ion battery energy density with higher, filled in high current
Its internal temperature can be caused to skyrocket when electric discharge, abuse or internal flaw and low-temperature working environment.And high temperature will lead to
Electrolyte decomposition, electrode material decomposes and the serious problems such as cell expansion, to cause the serious safeties accidents such as explosion.In battery
The preceding 45-90 seconds generation thermal change information that portion's temperature can change in surface temperature, therefore monitor surface temperature and be not enough to monitor
Battery security.In conclusion inside battery high temperature is the one of the major reasons for causing lithium ion battery failure and security risk.
Therefore, it is necessary to develop a kind of novel integrated sensing equipment that can be compatible with lithium ion battery, can utmostly reduce pair
The influence of performance of lithium ion battery, additionally it is possible to the maximum temperature variation for easily quickly learning lithium battery interior region in real time, from
And realize the purpose of real-time monitoring.By from temperature monitoring to high temperature early warning, long-life of the battery under different operating conditions, steady is ensured
Fixed and safe operation.
Currently, the monitoring means for lithium battery interior temperature mainly passes through contact thermocouple, contact thermal resistance
And three kinds of means of contact type optical fiber.Its basic characteristics is all then to pass through sensing element by the way that sensor is embedded to battery
Temperature characterisitic obtains the temperature information of inside battery.But its maximum disadvantage, first is that mostly single-point monitors, and in battery
The difference of the rate and path of portion's heat production and thermal diffusion causes the mode of burying in this that can only monitor some cell of inside battery
The temperature information in domain can not represent inside battery maximum temperature information, reduce the monitoring to internal temperature of battery variation
Efficiency.Second is that sensor embedded position is directly in electrode surface, characteristic size can hinder lithium ion in charge and discharge process
Deintercalation, affected to battery performance it is larger, cause battery capacity decay 20% or more.It thus can not accurate real-time monitoring electricity
Maximum temperature change information inside pond, can not efficiently guarantee battery security.
In conclusion existing monitoring means all realizes the accurate real-time monitoring to inside battery maximum temperature.
Summary of the invention
The purpose of the present invention is to solve the prior arts can not quick, lossless, real-time accurate measurements lithium ion battery
The problem of internal temperature changes, and a kind of production method that multipoint mode internal temperature monitors integrated electrochemical cell is provided.Realizing electricity
On the basis of pond works normally, real-time monitoring is carried out to the temperature information of inside battery important area under different operating conditions.
Above-mentioned purpose of the invention is achieved through the following technical solutions:
The production method that a kind of multipoint mode internal temperature of the invention monitors integrated electrochemical cell, specific manufacturing process are as follows:
1), argon atmosphere under the soft-package battery bottom end to be produced of one piece of not built-in temperature measuring equipment cut, and will be every
Film polishing removes, and exposes battery electrode section to the open air, exposes position to the open air to battery electrode section with optical glass and seal, tested
Battery；
2) when, carrying out the charge and discharge under different multiplying to test battery with battery charging/discharging apparatus, using thermal infrared imager
The electrode sections of test battery are exposed to the open air and carry out temperature change acquisition, determine the highest temperature region in electrode sections；
3), under argon atmosphere, using organic solvent by the highest temperature zone in the electrode material of battery electrode to be produced
Domain part is disposed, and keeps the collector of battery electrode processing region to be produced directly exposed, and the edge of processing region extends to
Cell terminal；
4), using the electrode material processing region shape of battery electrode to be produced in polyimides production shape and step 3)
The flexible substrate to match；
5), there are the temperature measuring point being evenly arranged, each temperature measuring point in the one side photoetching of flexible substrate using spin coating photoetching process
Be carved with independent metallic channel to the edge-light of flexible substrate, at each temperature measuring point on sputter thermo-sensitive material, in every metallic channel
Conductive material is sputtered, flexibility temperature sensor is obtained；
7), the non-photoetching one of flexibility temperature sensor is fitted in down on the collector in pretreatment Battery disposal region；
8), according to soft-package battery packaging technology, battery electrode to be produced and flexibility temperature sensor are encapsulated, and flexible temperature
It spends sensor and detection interface is drawn to cell terminal by the conductive material sputtered in each metallic channel；It is finally living by battery
After chemical industry skill, integrated electrochemical cell is obtained.
Processing environment described in step 1) and step 3), it is preferred to use water oxygen content is < argon atmosphere of 0.1ppm under into
Row.
When processing battery electrode processing region to be produced, it can individually handle, can also divide on one piece of battery electrode to be produced
It is other that two pieces of battery electrodes to be produced are handled simultaneously.
Organic solvent described in step 3) preferably uses -2 pyrrolidones of 1- methyl (NMP).
The thermo-sensitive material preferably uses platinum, and the conductive material preferably uses copper or gold.
The overall thickness of the flexibility temperature sensor is no more than the thickness of the electrode material of battery electrode to be produced.
Beneficial effect
For directly measuring external temperature or measuring internal single point temperature, method of the invention passes through experiment in situ
Inside battery highest temperature region has been determined, and real-time monitoring inside battery weight is realized by the design of multipoint mode flexible sensor
Want the temperature information in region.Based on inside battery electrochemical environment design multipoint mode flexible sensor and for electrode
" zero " thickness change after being embedded to sensor, realizes integrated with battery, does not have substantially to battery performance
It influences.It is tested based on different work condition environments temperature sensor is buried in lithium ion battery, can be established a set of from temperature prison
Measure the internal temperature of lithium ion battery real time monitoring of high temperature early warning.
Detailed description of the invention
Fig. 1 multipoint mode flexibility temperature sensor；
The integrated process schematic of Fig. 2 battery electrode to be produced and sensor；
Temperature-time of three temperature measuring points chosen in the integrated electrochemical cell that Fig. 3 makes for embodiment 1 under 0.5c multiplying power
Curve.
In figure: 1- flexible substrate；2- conducting wire；3- detects interface；4- collector；5- electrode material；6- flexibility temperature sensing
Device；8- temperature measuring point A；9- temperature measuring point B；10- temperature measuring point C.
Specific embodiment
The content of the present invention will be further explained with reference to the accompanying drawings and examples.
Embodiment 1
Lamination soft package lithium battery with nominal capacity for 150mAh is production object, production multipoint mode internal temperature monitoring one
Body electrochemical cell, specific manufacturing process are as follows:
1) soft package lithium battery of the 150mAh of one piece of not built-in temperature measuring equipment, is taken to carry out in water oxygen content being < 0.1ppm
Its bottom end is cut with Stupalox under argon atmosphere, extra diaphragm is polished with the carborundum paper of 2000 mesh and is removed, is exposed to the open air
Battery electrode section is exposed position to the open air to battery electrode section with optical glass and epoxy resin and is sealed again, surveyed
Try battery；
2) charge and discharge under different multiplying (0.5c, 1c, 1.5c, 2c), are carried out to test battery with battery charging/discharging apparatus
When, it is exposed to the open air using electrode sections of the thermal infrared imager to test battery and carries out temperature change acquisition, determined in electrode sections most
High-temperature region；
3) electrode material LiCoO, is chosen2/ collector aluminium is used as anode as cathode, electrode material graphite/collector copper,
It is interior 24 hours dry with 80 DEG C to be placed in vacuum drying oven, obtains battery electrode to be produced.
4), under argon atmosphere, using NMP by the highest temperature region part of electrode material 5 in anode to be produced
Dispose, make anode processing region to be produced collector 4 directly it is exposed, and the edge of processing region extend to it is to be produced
Anode terminals；
5) it, takes 30 μm of polyimides to make anode processing region shape to be produced in shape and step 4) to match
Flexible substrate；
6), there are the temperature measuring point being evenly arranged, each temperature measuring point in the one side photoetching of flexible substrate 1 using spin coating photoetching process
Be carved with independent metallic channel 2 to edge-light, at each temperature measuring point on sputter thermo-sensitive material, sputter conduction material in every metallic channel
Material, obtains flexibility temperature sensor 6, as shown in Figure 1；
7), the non-photoetching one of flexibility temperature sensor 6 is fitted in the afflux of anode processing region to be produced down
On body 4；
8), according to lamination soft-package battery packaging technology, battery plus-negative plate to be produced and flexibility temperature sensor 6 are encapsulated,
And flexibility temperature sensor 6 draws detection interface 3 to cell terminal by the conductive material sputtered in each metallic channel, integrates
Process is as shown in Figure 2；It is subsequently placed under 45 DEG C of constant temperatures, pre-activate 24 hours, activation, then the activation of low current charge and discharge
Afterwards, integrated electrochemical cell is obtained.
The integrated electrochemical cell that embodiment 1 is obtained carries out charge-discharge test with the multiplying power of 0.5c, and flexibility temperature sensor 6 is logical
The outside real-time Transmission lithium battery interior temperature information of detection interface 3 is crossed, the temperature measuring point A8 of flexibility temperature sensor 6 in Fig. 1,
In integrated battery charge and discharge process, the variation that 3 points of temperature measured change over time is bent by temperature measuring point B9 and temperature measuring point C10
Line compares figure, as shown in Figure 3.
Claims (6)
1. the production method that a kind of multipoint mode internal temperature monitors integrated electrochemical cell, it is characterized in that: specific manufacturing process is as follows:
1), argon atmosphere under the soft-package battery bottom end to be produced of one piece of not built-in temperature measuring equipment cut, and diaphragm is beaten
Removing is gone, and exposes battery electrode section to the open air, is exposed position to the open air to battery electrode section with optical glass and is sealed, and test electricity is obtained
Pond；
2) when, carrying out the charge and discharge under different multiplying to test battery with battery charging/discharging apparatus, using thermal infrared imager to survey
The electrode sections of examination battery, which expose to the open air, carries out temperature change acquisition, determines the highest temperature region in electrode sections；
3), under argon atmosphere, using organic solvent by the highest temperature region portion in the electrode material of battery electrode to be produced
Divide and dispose, keeps the collector of battery electrode processing region to be produced directly exposed, and the edge of processing region extends to battery
Terminals；
4), using the electrode material processing region shape phase of polyimides production shape and battery electrode to be produced in step 3)
The flexible substrate matched；
5), have a temperature measuring point being evenly arranged in the one side photoetching of flexible substrate using spin coating photoetching process, each temperature measuring point to
The edge-light of flexible substrate is carved with independent metallic channel, at each temperature measuring point on sputter thermo-sensitive material, sputtering in every metallic channel
Conductive material obtains flexibility temperature sensor；
7), the non-photoetching one of flexibility temperature sensor is fitted in down on the collector in pretreatment Battery disposal region；
8), according to soft-package battery packaging technology, battery electrode to be produced and flexibility temperature sensor are encapsulated, and flexible temperature passes
Sensor draws detection interface to cell terminal by the conductive material sputtered in each metallic channel；Finally pass through cell activation work
After skill, integrated electrochemical cell is obtained.
2. production method as described in claim 1, it is characterized in that: processing environment described in step 1) and step 3), using water
Oxygen content is < argon atmosphere of 0.1ppm under carry out.
3. production method as described in claim 1, it is characterized in that: when processing battery electrode processing region to be produced, using list
It is solely handled on one piece of battery electrode to be produced, or uses and two pieces of battery electrodes to be produced are handled simultaneously respectively.
4. production method as described in claim 1, it is characterized in that: organic solvent described in step 3) uses -2 pyrroles of 1- methyl
Alkanone.
5. production method as described in claim 1, it is characterized in that: the thermo-sensitive material uses platinum, the conductive material
Using copper or gold.
6. production method as described in claim 1, it is characterized in that: the overall thickness of the flexibility temperature sensor is no more than wait make
Make the thickness of the electrode material of battery electrode.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810902496.XA CN109065961B (en) | 2018-08-09 | 2018-08-09 | A manufacturing method of a multi-point internal temperature monitoring integrated battery |
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|---|---|---|---|
| CN201810902496.XA CN109065961B (en) | 2018-08-09 | 2018-08-09 | A manufacturing method of a multi-point internal temperature monitoring integrated battery |
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| Publication Number | Publication Date |
|---|---|
| CN109065961A true CN109065961A (en) | 2018-12-21 |
| CN109065961B CN109065961B (en) | 2020-07-24 |
Family
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110715747A (en) * | 2019-10-14 | 2020-01-21 | 中国民用航空飞行学院 | Detection method based on soft pack battery tab connection |
| CN111628210A (en) * | 2020-04-22 | 2020-09-04 | 北京航空航天大学 | Lithium ion battery supporting in-situ measurement of internal temperature of battery and manufacturing method |
| CN113823801A (en) * | 2020-06-18 | 2021-12-21 | 青岛九环新越新能源科技股份有限公司 | Temperature-adjustable and controllable energy storage equipment battery cell, laminated battery cell and composite power battery cell |
| CN113823800A (en) * | 2020-06-18 | 2021-12-21 | 青岛九环新越新能源科技股份有限公司 | Energy storage equipment current collector capable of monitoring internal temperature in real time, battery cell, laminated battery cell and composite power battery cell |
| CN114295160A (en) * | 2021-12-27 | 2022-04-08 | 中国电子科技集团公司第十八研究所 | Flexible sensing array for monitoring multiple physical fields in lithium battery |
| US11322806B2 (en) * | 2019-09-13 | 2022-05-03 | Hutchinson Technology Incorporated | Sensored battery electrode |
| CN114597337A (en) * | 2022-03-24 | 2022-06-07 | 深圳吉阳智能科技有限公司 | Battery pole piece and power battery |
| CN114709361A (en) * | 2021-06-18 | 2022-07-05 | 宁波大学 | Lithium ion battery and manufacturing method thereof |
| US11791521B2 (en) | 2019-09-13 | 2023-10-17 | Hutchinson Technology Incorporated | Electrode tabs and methods of forming |
| WO2024164146A1 (en) * | 2023-02-07 | 2024-08-15 | 厦门大学 | Charge-discharge apparatus, manufacturing method therefor, battery cell, battery, and electrical apparatus |
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| CN110715747A (en) * | 2019-10-14 | 2020-01-21 | 中国民用航空飞行学院 | Detection method based on soft pack battery tab connection |
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| CN113823801A (en) * | 2020-06-18 | 2021-12-21 | 青岛九环新越新能源科技股份有限公司 | Temperature-adjustable and controllable energy storage equipment battery cell, laminated battery cell and composite power battery cell |
| CN113823800A (en) * | 2020-06-18 | 2021-12-21 | 青岛九环新越新能源科技股份有限公司 | Energy storage equipment current collector capable of monitoring internal temperature in real time, battery cell, laminated battery cell and composite power battery cell |
| CN114709361A (en) * | 2021-06-18 | 2022-07-05 | 宁波大学 | Lithium ion battery and manufacturing method thereof |
| CN114295160B (en) * | 2021-12-27 | 2023-07-18 | 中国电子科技集团公司第十八研究所 | Flexible sensing array for monitoring multiple physical fields in lithium battery |
| CN114295160A (en) * | 2021-12-27 | 2022-04-08 | 中国电子科技集团公司第十八研究所 | Flexible sensing array for monitoring multiple physical fields in lithium battery |
| CN114597337A (en) * | 2022-03-24 | 2022-06-07 | 深圳吉阳智能科技有限公司 | Battery pole piece and power battery |
| WO2024164146A1 (en) * | 2023-02-07 | 2024-08-15 | 厦门大学 | Charge-discharge apparatus, manufacturing method therefor, battery cell, battery, and electrical apparatus |
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| CN109065961B (en) | 2020-07-24 |
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Inventor after: Song Weili Inventor after: Chen Haosen Inventor after: Fang Daining Inventor after: Sun Lei Inventor after: Pan Taisong Inventor after: Han Jindong Inventor after: Wang Peng Inventor after: Zhu Shengxin Inventor before: Song Weili Inventor before: Chen Haosen Inventor before: Han Jindong Inventor before: Wang Peng Inventor before: Zhu Shengxin |