CN107015155B - A kind of measuring method and device of battery of electric vehicle SOH - Google Patents
A kind of measuring method and device of battery of electric vehicle SOH Download PDFInfo
- Publication number
- CN107015155B CN107015155B CN201710183896.5A CN201710183896A CN107015155B CN 107015155 B CN107015155 B CN 107015155B CN 201710183896 A CN201710183896 A CN 201710183896A CN 107015155 B CN107015155 B CN 107015155B
- Authority
- CN
- China
- Prior art keywords
- battery
- soh
- value
- electric vehicle
- present
- 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
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/3644—Constructional arrangements
- G01R31/3648—Constructional arrangements comprising digital calculation means, e.g. for performing an algorithm
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/392—Determining battery ageing or deterioration, e.g. state of health
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Secondary Cells (AREA)
- Tests Of Electric Status Of Batteries (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The present invention provides the measuring methods of battery of electric vehicle SOH a kind of, comprising the following steps: S1: the SOH value of present battery, SOH are measured by circulating battery coulometry1=1-Q/ (5Qt)；Wherein, Q is the accumulated discharge amount of battery, and Qt is discharge capacity of the battery within the scope of life cycle；S2: the SOH value of present battery, SOH are measured by volumetric method2=QN/QC, QN are the maximum capacity of present battery, and QC is the nominal capacity of battery；S3: judge SOH1With SOH2It is whether identical；If they are the same, then real-time battery SOH value is SOH1；If not identical, Qt is modified, revised Qt=Q/ (5 (1-SOH2)), SOH is calculated further according to revised Qt1.Compared with the prior art, the present invention passes through the characteristics of combining circulation coulometry and volumetric method, carries out high-precision real-time monitoring to battery to realize.
Description
Technical field
The present invention relates to electric automobiles, the especially a kind of measuring method and device of battery of electric vehicle SOH.
Background technique
One battery pack or battery pack, as continuous charge and discharge cycles use, battery capacity can constantly reduce, battery
Continuous aging, this judges that the index of cell degradation is exactly SOH (cell health state).Monitor battery SOH state can and
Shi Zhidao battery aging status carries out maintenance and the replacement battery of battery pack in time.
The method of test battery SOH has following several at present: one is from cell degradation mechanistic point, studying capacity attenuation
Increase the relationship with SOH with internal resistance；It one is from experimental viewpoint, is tested by standard testing, determined off-line battery SOH；
One is battery model is established, the internal resistance of cell, capacitor etc. are known using such as least square method, Kalman filtering scheduling algorithm
Not, SOH is calculated.
However, the prior art still has following technological deficiency:
1, since internal resistance of cell distribution is more dispersed, internal resistance difference is bigger between different batteries, the relationship of internal resistance and SOH
There is no versatility.
2, standard test survey SOH needs off-line test, time-consuming and laborious, needs dedicated test equipment, with high costs, and electricity
Pond packet testing cost is bigger.
3, battery model method algorithm is complicated, and battery model establishes difficulty, is difficult to obtain good application in practice.
Summary of the invention
The purpose of the present invention is to overcome the shortcomings of the existing technology and deficiency, provides the survey of battery of electric vehicle SOH a kind of
Calculate method and device.
The present invention is realized by scheme below: a kind of measuring method of battery of electric vehicle SOH, comprising the following steps:
S1: the SOH value of present battery, SOH are measured by circulating battery coulometry1=1-Q/ (5Qt)；Wherein, Q is battery
Accumulated discharge amount, Qt be discharge capacity of the battery within the scope of life cycle；
S2: the SOH value of present battery, SOH are measured by volumetric method2=QN/QC, QN are the maximum capacity of present battery,
QC is the nominal capacity of battery；
S3: judge SOH1With SOH2It is whether identical；If they are the same, then real-time battery SOH value is SOH1；If not identical, to Qt
It is modified, revised Qt=Q/ (5 (1-SOH2)), SOH is calculated further according to revised Qt1。
Compared with the prior art, the present invention passes through the characteristics of combining circulation coulometry and volumetric method, to realize to battery
Carry out high-precision real-time monitoring.
As a further improvement of the present invention, include: in the step S1
S11: obtaining discharge capacity Qt of the battery within the scope of life cycle, the life cycle of the battery be SOH value from
100% drops to 80%；
S12: the accumulated discharge amount Q of battery is added up；
S13: the SOH value of present battery, SOH are calculated1=1-Q/ (5Qt).
As a further improvement of the present invention, the accumulated discharge of battery is calculated in the step S12 by current integration method
Measure Q.
As a further improvement of the present invention, include: in the step S2
S21: the SOC initial value SOCini and end value SOCend of battery in a charging process are recorded in；
S22: calculating the electric quantity change amount DQ in the secondary charging process, obtains battery maximum capacity QN=DQ/ (SOCend-
SOCini)；
S23: obtaining the SOH value of battery, and SOH2=QN/QC, QC are the nominal capacity of battery.
As a further improvement of the present invention, in the step S21, when charging start and charging terminate temperature 25 DEG C ±
5℃。
As a further improvement of the present invention, pass through the electricity of current integration method counting cell charging in the step S22
Variable quantity DQ.
The present invention also provides the measuring and calculating devices of battery of electric vehicle SOH a kind of, including
First battery SOH value computing module, for calculating the SOH value of present battery, SOH by circulating battery coulometry1
=1-Q/ (5Qt)；Wherein, Q is the accumulated discharge amount of battery, and Qt is discharge capacity of the battery within the scope of life cycle；
Second battery SOH value computing module, for measuring the SOH value of present battery, SOH by volumetric method2=QN/QC,
QN is the maximum capacity of present battery, and QC is the nominal capacity of battery；
SOH value judgment amendment module, for judging whether SOH1 and SOH2 is identical；If they are the same, then real-time battery SOH value is
SOH1；If not identical, Qt is modified, revised Qt=Q/ (5 (1-SOH2)), it is calculated further according to revised Qt
SOH1。
As a further improvement of the present invention, include: in the first battery SOH value computing module
Discharge capacity obtains module, for obtaining discharge capacity Qt of the battery within the scope of life cycle, the life of the battery
Period drops to 80% from 100% for SOH value；
Accumulation module adds up for the accumulated discharge amount Q to battery；
First computing module, for calculating the SOH value of present battery, SOH1=1-Q/ (5Qt).
As a further improvement of the present invention, include: in the second battery SOH value computing module
Logging modle, for recording the SOC initial value SOC of battery during the charging processiniWith end value SOCend；
Battery maximum capacity obtains module, for calculating the electric quantity change amount DQ in charging process, obtains battery maximum and holds
Measure QN=DQ/ (SOCend-SOCini)；
Second computing module, for calculating the SOH value for obtaining battery, SOH2=QN/QC, QC are the nominal capacity of battery.
As a further improvement of the present invention, battery is in the temperature that charging starts and charging terminates at 25 DEG C ± 5 DEG C.
To sum up, the present invention is simple and practical, and algorithm parameter can be easier to obtain, and be not required to exclusively carry out a large amount of test experiments.It is logical
Crossing ring coulometry can be monitored in real time the variation of battery SOH, and volumetric method can correct the parameter of circulation coulometry, to improve
SOH estimation precision.
In order to better understand and implement, the invention will now be described in detail with reference to the accompanying drawings.
Detailed description of the invention
Fig. 1 is the step flow chart of the measuring method of battery of electric vehicle SOH of the invention.
Fig. 2 is the measuring and calculating device connection block diagram of battery of electric vehicle SOH of the invention.
Specific embodiment
With reference to embodiments and attached drawing the present invention is described in further detail, but embodiments of the present invention are unlimited
In this.
In order to which the battery to electric vehicle is measured in real time, the present invention in view of the drawbacks of the prior art, provides a kind of electricity
The measuring method of motor-car battery SOH, main pass through combine circulation electricity hair and volumetric method, are more precisely carried out in real time with reaching
The purpose of monitoring.It is introduced especially by following embodiment:
Referring to Fig. 1, its step flow chart for the measuring method of battery of electric vehicle SOH of the invention.Electricity of the invention
Motor-car battery SOH measuring method, specifically includes the following steps:
S1: the SOH value of present battery, SOH are measured by circulating battery coulometry1=1-Q/ (5Qt)；Wherein, Q is battery
Accumulated discharge amount, Qt be discharge capacity of the battery within the scope of life cycle.
Further, it in this step S1, is realized especially by following steps:
S11: obtaining discharge capacity Qt of the battery within the scope of life cycle, the life cycle of the battery be SOH value from
100% drops to 80%.Here life cycle is the standard for the battery of electric vehicle service life, the general battery for working as electric vehicle
SOH value drops to
S12: the accumulated discharge amount Q of battery is added up.Preferably, in the present embodiment especially by current integration method
Calculate the accumulated discharge amount Q of battery.
S13: the SOH value of present battery, SOH are calculated1=1-Q/ (5Qt).
For this step S1, generally battery factory before can using the battery cycle life method battery carry out SOH value into
Row measuring and calculating.
S2: the SOH value of present battery, SOH are measured by volumetric method2=QN/QC, QN are the maximum capacity of present battery,
QC is the nominal capacity of battery.
Further, it in this step S2, is realized especially by following steps:
S21: it is recorded in the SOC initial value SOC of battery in a charging processiniWith end value SOCend.Specifically, battery
Need to meet during the charging process: when charging starts and charging terminates temperature at 25 DEG C ± 5 DEG C, maximum charging current is less than
0.5C。
S22: calculating the electric quantity change amount DQ in the secondary charging process, obtains battery maximum capacity QN=DQ/ (SOCend-
SOCini).Preferably, pass through the electric quantity change amount DQ of current integration method counting cell charging in this step.
S23: the SOH value of battery, SOH are obtained2=QN/QC, QC are the nominal capacity of battery.
It in this step S2, is had been loaded on electric vehicle for battery, the battery management during the charging of battery
System can carry out real-time display to the SOC value of battery.
S3: judge SOH1With SOH2It is whether identical；If they are the same, then real-time battery SOH value is SOH1；If not identical, to Qt
It is modified, revised Qt=Q/ (5 (1-SOH2)), SOH is calculated further according to revised Qt1。
Please refer to Fig. 2, the measuring and calculating device for being battery of electric vehicle SOH of the invention connects block diagram.On realizing
The measuring method for stating battery of electric vehicle SOH, the present invention also provides the measuring and calculating devices of battery of electric vehicle SOH a kind of, specifically include:
First battery SOH value computing module 1, the second battery SOH value computing module 2 and SOH value judgment amendment module 3.
The first battery SOH value computing module 1, for calculating the SOH value of present battery by circulating battery coulometry,
SOH1=1-Q/ (5Qt)；Wherein, Q is the accumulated discharge amount of battery, and Qt is discharge capacity of the battery within the scope of life cycle.
Specifically, including: that discharge capacity obtains module 11,12 and of accumulation module in the first battery SOH value computing module 1
First computing module 13.
The discharge capacity obtains module 11, for obtaining discharge capacity Qt of the battery within the scope of life cycle, the battery
Life cycle be that SOH value from 100% drops to 80%.
The accumulation module 12 adds up for the accumulated discharge amount Q to battery.
First computing module 13, for calculating the SOH value of present battery, SOH1=1-Q/ (5Qt).
The second battery SOH value computing module 2, for measuring the SOH value of present battery, SOH2=by volumetric method
QN/QC, QN are the maximum capacity of present battery, and QC is the nominal capacity of battery.
Specifically, including: logging modle 21, battery maximum capacity acquisition mould in the second battery SOH value computing module 2
Block 22 and the second computing module 23.
The logging modle 21, for recording the SOC initial value SOC of battery during the charging processiniWith end value SOCend。
Specifically, battery starts in charging and the temperature of charging end is at 25 DEG C ± 5 DEG C, maximum charging current is less than 0.5C.
The battery maximum capacity obtains module 22, for calculating the electric quantity change amount DQ in charging process, obtains battery
Maximum capacity QN=DQ/ (SOCend-SOCini)。
Second computing module 23, for calculating the SOH value for obtaining battery, SOH2=QN/QC, QC are the nominal of battery
Capacity.
The SOH value judgment amendment module 3, for judging SOH1With SOH2It is whether identical；If they are the same, then real-time battery SOH
Value is SOH1；If not identical, Qt is modified, revised Qt=Q/ (5 (1-SOH2)), it is counted further according to revised Qt
Calculate SOH1。
Compared with the prior art, the present invention is simple and practical, and algorithm parameter can be easier to obtain, and be not required to exclusively carry out big measurement
Examination experiment.The variation of battery SOH can be monitored in real time by ring coulometry, volumetric method can correct the parameter of circulation coulometry,
To improve SOH estimation precision.
The above embodiment is a preferred embodiment of the present invention, but embodiments of the present invention are not by above-described embodiment
Limitation, other any changes, modifications, substitutions, combinations, simplifications made without departing from the spirit and principles of the present invention,
It should be equivalent substitute mode, be included within the scope of the present invention.
Claims (10)
1. a kind of measuring method of battery of electric vehicle SOH, it is characterised in that: the following steps are included:
S1: the SOH value of present battery, SOH are measured by circulating battery coulometry1=1-Q/ (5Qt)；Wherein, Q is the tired of battery
Discharge capacity is counted, Qt is discharge capacity of the battery within the scope of life cycle；
S2: the SOH value of present battery, SOH are measured by volumetric method2=QN/QC, QN are the maximum capacity of present battery, and QC is electricity
The nominal capacity in pond；
S3: judge SOH1With SOH2It is whether identical；If they are the same, then real-time battery SOH value is SOH1；If not identical, Qt is carried out
Amendment, revised Qt=Q/ (5 (1-SOH2)), SOH is calculated further according to revised Qt1。
2. the measuring method of battery of electric vehicle SOH according to claim 1, it is characterised in that: include: in the step S1
S11: obtaining discharge capacity Qt of the battery within the scope of life cycle, and the life cycle of the battery is SOH value under 100%
It is down to 80%；
S12: the accumulated discharge amount Q of battery is added up；
S13: the SOH value of present battery, SOH are calculated1=1-Q/ (5Qt).
3. the measuring method of battery of electric vehicle SOH according to claim 1, it is characterised in that: pass through peace in the step S12
When integration method calculate battery accumulated discharge amount Q.
4. the measuring method of battery of electric vehicle SOH according to claim 1, it is characterised in that: include: in the step S2
S21: it is recorded in the SOC initial value SOC of battery in a charging processiniWith end value SOCend；
S22: calculating the electric quantity change amount DQ in the secondary charging process, obtains battery maximum capacity QN=DQ/ (SOCend-
SOCini)；
S23: the SOH value of battery, SOH are obtained2=QN/QC, QC are the nominal capacity of battery.
5. the measuring method of battery of electric vehicle SOH according to claim 4, it is characterised in that: in the step S21, when filling
Establishing beginning and charging by cable terminates temperature at 25 DEG C ± 5 DEG C.
6. the measuring method of battery of electric vehicle SOH according to claim 4, it is characterised in that: pass through peace in the step S22
When integration method counting cell charging electric quantity change amount DQ.
7. a kind of measuring and calculating device of battery of electric vehicle SOH, it is characterised in that: including
First battery SOH value computing module, for calculating the SOH value of present battery, SOH by circulating battery coulometry1=1-Q/
(5Qt)；Wherein, Q is the accumulated discharge amount of battery, and Qt is discharge capacity of the battery within the scope of life cycle；
Second battery SOH value computing module, for measuring the SOH value of present battery, SOH by volumetric method2=QN/QC, QN are to work as
The maximum capacity of preceding battery, QC are the nominal capacity of battery；
SOH value judgment amendment module, for judging SOH1With SOH2It is whether identical；If they are the same, then real-time battery SOH value is SOH1；
If not identical, Qt is modified, revised Qt=Q/ (5 (1-SOH2)), SOH is calculated further according to revised Qt1。
8. the measuring and calculating device of battery of electric vehicle SOH according to claim 7, it is characterised in that: the first battery SOH value meter
It calculates in module and includes:
Discharge capacity obtains module, for obtaining discharge capacity Qt of the battery within the scope of life cycle, the life cycle of the battery
80% is dropped to from 100% for SOH value；
Accumulation module adds up for the accumulated discharge amount Q to battery；
First computing module, for calculating the SOH value of present battery, SOH1=1-Q/ (5Qt).
9. the measuring and calculating device of battery of electric vehicle SOH according to claim 7, it is characterised in that: the second battery SOH value meter
It calculates in module and includes:
Logging modle, for recording the SOC initial value SOC of battery during the charging processiniWith end value SOCend；
Battery maximum capacity obtains module, for calculating the electric quantity change amount DQ in charging process, obtains battery maximum capacity QN
=DQ/ (SOCend-SOCini)；
Second computing module, for calculating the SOH value for obtaining battery, SOH2=QN/QC, QC are the nominal capacity of battery.
10. the measuring and calculating device of battery of electric vehicle SOH according to claim 9, it is characterised in that: battery starts and fills in charging
The temperature that electricity terminates is at 25 DEG C ± 5 DEG C.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710183896.5A CN107015155B (en) | 2017-03-24 | 2017-03-24 | A kind of measuring method and device of battery of electric vehicle SOH |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710183896.5A CN107015155B (en) | 2017-03-24 | 2017-03-24 | A kind of measuring method and device of battery of electric vehicle SOH |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107015155A CN107015155A (en) | 2017-08-04 |
| CN107015155B true CN107015155B (en) | 2019-09-17 |
Family
ID=59446025
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710183896.5A Active CN107015155B (en) | 2017-03-24 | 2017-03-24 | A kind of measuring method and device of battery of electric vehicle SOH |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107015155B (en) |
Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107742755B (en) * | 2017-09-27 | 2019-05-28 | 安徽江淮汽车集团股份有限公司 | Electric car SOH modification method and device |
| CN109061511B (en) * | 2018-09-20 | 2021-02-26 | 苏州艾思控科技有限公司 | Method for calculating SOH of battery monomer in real time in battery management system |
| CN109407008A (en) * | 2018-10-12 | 2019-03-01 | 安徽江淮汽车集团股份有限公司 | A kind of modification method of electric car SOH |
| CN110568375A (en) * | 2019-09-03 | 2019-12-13 | 昆山宝创新能源科技有限公司 | SOH (state of health) determination method and device for power battery |
| CN111693881B (en) * | 2020-05-28 | 2021-09-10 | 江苏大学 | Method for estimating state of health of battery on line under wide temperature range based on standardized temperature |
| CN111965558B (en) * | 2020-07-22 | 2023-01-31 | 宝能(广州)汽车研究院有限公司 | SOH value acquisition method and system, electric vehicle and computer readable storage medium |
| CN112285462A (en) * | 2020-10-13 | 2021-01-29 | 安徽锐能科技有限公司 | Testing device and method for battery management system and storage medium |
| CN115825743A (en) * | 2022-03-07 | 2023-03-21 | 宁德时代新能源科技股份有限公司 | Battery SOH value calculation method, control device and battery management system |
| CN115407211B (en) * | 2022-11-01 | 2023-01-31 | 北京航空航天大学 | A method and system for online prediction of the state of health of lithium batteries of electric vehicles |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9244132B2 (en) * | 2011-09-12 | 2016-01-26 | Eaglepicher Technologies, Llc | Systems and methods for determining battery state-of-health |
| CN104241713B (en) * | 2013-06-18 | 2017-02-01 | 北汽福田汽车股份有限公司 | SOC (state of charge) correcting method and SOC correcting device of power battery |
| CN104051810B (en) * | 2014-06-25 | 2016-04-06 | 中国东方电气集团有限公司 | A kind of lithium-ion energy storage battery system SOC estimates rapid correction method |
| CN106291378B (en) * | 2016-08-15 | 2018-11-27 | 金龙联合汽车工业（苏州）有限公司 | A kind of measuring method of electric automobile power battery SOH |
| CN106532187B (en) * | 2016-11-08 | 2018-11-06 | 哈尔滨理工大学 | A kind of battery heating means based on cell health state |
-
2017
- 2017-03-24 CN CN201710183896.5A patent/CN107015155B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN107015155A (en) | 2017-08-04 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN107015155B (en) | A kind of measuring method and device of battery of electric vehicle SOH | |
| CN104502859B (en) | Method for detecting and diagnosing battery charge and battery health state | |
| CN103728563B (en) | A kind of measuring method of cell health state | |
| CN106291372B (en) | Novel method for predicting residual life of lithium ion power battery | |
| CN113219351B (en) | Monitoring method and device for power battery | |
| CN108896930A (en) | A method of lithium battery temperature rise situation is assessed using total yield thermal power general formula | |
| CN104977537B (en) | The determination method of battery SOC and the battery management system for using this method | |
| CN109870659A (en) | Lithium-ion battery state of health estimation method using sliding window optimization strategy | |
| CN102565710A (en) | Method and apparatus for assessing battery state of health | |
| CN111036575B (en) | A Lithium-ion Battery Sorting Method Based on Temperature Change Analysis | |
| CN108732499B (en) | Method and system for detecting cycle life of lithium ion battery | |
| CN106597289A (en) | Battery state-of-health measuring method | |
| CN103293483A (en) | Lithium battery health condition estimation method based on internal resistance measurement | |
| CN105738814A (en) | Method for evaluating capacity attenuation degree of lithium ion battery online | |
| CN108120932B (en) | Method and device for estimating state of health of rechargeable battery | |
| CN109541479A (en) | A kind of predictor method and device of battery remaining power | |
| TWI597510B (en) | Battery Life Cycle Prediction System and Method | |
| CN114444370A (en) | Method and device for predicting accumulated loss life of rechargeable battery by considering operation conditions, electronic equipment and readable storage medium | |
| CN105738828B (en) | A kind of battery capacity accurately measures method | |
| CN107505575A (en) | A kind of fast evaluation method of retired electrokinetic cell | |
| KR20150045600A (en) | Battery tester and its control method | |
| CN106970329B (en) | A method for judging the relative health of a battery and a battery pack power supply system | |
| CN112415400A (en) | Battery capacity estimation method and system | |
| JP3239547U (en) | Lithium-ion battery soundness and remaining useful life measurement system | |
| CN106599333A (en) | Method for estimating SOH of power supply |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| CB02 | Change of applicant information | ||
| CB02 | Change of applicant information |
Address after: 529000 No. 336 Qinglan Road, Jiangmen High-tech Development Zone, Guangdong Province Applicant after: Hanyu Group Co., Ltd. Address before: 529000 No. 336 Qinglan Road, Jiangmen High-tech Development Zone, Guangdong Province Applicant before: Jiangmen Idear-hanyu Electrical Joint-stock Co., Ltd. |
|
| GR01 | Patent grant | ||
| GR01 | Patent grant |