CN108226806A - Self discharge detection method and battery check device after charged - Google Patents

Self discharge detection method and battery check device after charged Download PDF

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Publication number
CN108226806A
CN108226806A CN201810097665.7A CN201810097665A CN108226806A CN 108226806 A CN108226806 A CN 108226806A CN 201810097665 A CN201810097665 A CN 201810097665A CN 108226806 A CN108226806 A CN 108226806A
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battery
constant
time
value
current
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CN108226806B (en
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刘玉良
赵盼盼
田英鸽
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Henan State Energy Battery Co Ltd
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Henan State Energy Battery Co Ltd
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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/36Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
    • G01R31/382Arrangements for monitoring battery or accumulator variables, e.g. SoC
    • G01R31/3835Arrangements for monitoring battery or accumulator variables, e.g. SoC involving only voltage measurements

Abstract

The present invention relates to technical field of lithium ion, more particularly, to a kind of charged rear self discharge detection method and battery check device.Self discharge detection method, includes the following steps after charged:S1:To carrying out first time partial volume in the lower battery of state-of-charge time, battery capacity C is calculated;S2:After the battery static placement T1 times, the open-circuit voltage OCV1 of battery is tested, again by after the battery static placement T2 times, the open-circuit voltage OCV2 of battery is tested, obtains the self-discharge rate K, wherein K=(OCV1 OCV2)/T2 12h of battery;S3:Battery is divided into A, B, C and D grades according to K values, bad battery in D grades is put in storage, battery in B and C grades carries out second of partial volume, the battery that capacity is filled with less than the first pre-value of total capacity places the T3 times, it will be filled with after battery of the capacity higher than the first pre-value shelves the T4 times and carry out third time partial volume, defective products is put in storage.To alleviate the technical issues of battery testing overlong time, opponent's battery loss in the prior art are larger and technique is cumbersome.

Description

Self discharge detection method and battery check device after charged
Technical field
The present invention relates to technical field of lithium ion, more particularly, to a kind of charged rear self discharge detection method and battery Detection device.
Background technology
With being on the rise for energy crisis and environmental pollution, novel secondary non-polluting energy sources gradually obtain countries in the world The attention of government, research institution and enterprise.It is burnt that the application of the free of contamination renewable sources of energy such as solar energy and wind energy gradually becomes the energy One of point, electric vehicle are even more the pressure widelyd popularize by countries in the world government to alleviate the energy and environmental pollution.
The detection of lithium ion battery self discharge is always a difficult point, because can be accurate almost without equipment under quiescent conditions The energy for detecting battery, since cell voltage and self-energy are not linear relationship, cause the testing time longer easily Half wheat harvesting period, needs low battery to store for a long time during detection, there is very macrolesion to battery electrical property in this way;And technique It is cumbersome, also to continue charged unsuitable automated production after partial volume.
Therefore how to solve that battery testing overlong time, opponent's battery loss are larger and technique is cumbersome becomes art technology Personnel's urgent problem to be solved.
Invention content
The purpose of the present invention is to provide a kind of charged rear self discharge detection method, to alleviate electricity in the prior art The technical issues of pond testing time is long, opponent's battery loss is larger and technique is cumbersome.
Self discharge detection method, includes the following steps after one kind provided by the invention is charged:
S1:To carrying out first time partial volume in the lower battery of state-of-charge time, battery capacity C is calculated;
S2:After the battery static placement T1 times, the open-circuit voltage OCV1 of battery is tested, again by the static placement T2 of battery After time, the open-circuit voltage OCV2 of battery is tested, obtains the self-discharge rate K of battery, wherein K=(OCV1-OCV2)/T2-12h;
S3:Battery is divided into A, B, C and D grades according to K values, the bad battery in D grades is put in storage, the battery in B and C grades Second of partial volume is carried out, is filled with capacity less than total capacity
The battery of the first pre-value place the T3 times, being filled with capacity, to shelve the T4 times laggard higher than the battery of the first pre-value Row third time partial volume will continuously be filled with capacity and is put in storage higher than the first pre-value as defective products three times.
Further, first time partial volume includes the following steps:
S10:First time constant-current charge, second of constant-current charge and first time constant-voltage charge, so that the voltage of battery reaches Second pre-value;
S11:First time constant-current discharge, third time constant-current charge and second of constant-voltage charge, so that cell voltage reaches Three pre-values;
S12:Second of constant-current discharge, the 4th constant-current charge and third time constant-voltage charge, so that cell voltage reaches again It is secondary to arrive third pre-value;
S13:Third time constant-current discharge, the 5th constant-current charge and the 4th constant-voltage charge, so that cell voltage reaches again It is secondary to arrive third pre-value.
Further, the mode that obtains of the battery capacity C is:When third time constant-current discharge the voltage of battery need to reach 4th pre-value, and third time constant-current discharge reaches time of the 4th pre-value for T5, electric current constant I during third time constant-current discharge;Its Middle C=I × T5.
Further, capacity cutoff is additionally provided in the first time partial volume, for protecting battery.
Further, the battery of the K values in A carries out combo, and second of partial volume and third time are carried out by B grades and C grades Battery up to specification carries out combo after partial volume.
A kind of battery check device provided by the invention, the battery check device include:
Computing module, for carrying out first time partial volume, and battery capacity C is calculated in the lower battery of state-of-charge time;
Test module for testing the battery after the static placement T1 times, tests the open-circuit voltage OCV1 of battery, again will After the battery static placement T2 times, the open-circuit voltage OCV2 of battery is tested, obtains the self-discharge rate K, wherein K=(OCV1- of battery OCV2)/T2-12h;
Grading module for battery to be divided into A, B, C and D grades according to K values, the bad battery in D grades is put in storage, B and C Battery in shelves carries out second of partial volume, and the battery for being filled with capacity less than the first pre-value of total capacity places the T3 times, will be filled with Capacity carries out third time partial volume after shelving the T4 times higher than the battery of the first pre-value, and it is pre- higher than first will to be continuously filled with capacity three times Value is put in storage as defective products.
Further, the computing module is additionally operable to first time constant-current charge, second of constant-current charge and first time constant pressure Charging, so that the voltage of battery reaches the second pre-value;First time constant-current discharge, third time constant-current charge and second of constant pressure are filled Electricity, so that cell voltage reaches third pre-value;Second of constant-current discharge, the 4th constant-current charge and third time constant-voltage charge, with Reach cell voltage and arrive third pre-value again;Third time constant-current discharge, the 5th constant-current charge and the 4th constant-voltage charge, with Reach cell voltage and arrive third pre-value again.
Further, the mode that obtains of the battery capacity C is:When third time constant-current discharge the voltage of battery need to reach 4th pre-value, and third time constant-current discharge reaches time of the 4th pre-value for T5, electric current constant I during third time constant-current discharge;Its Middle C=I × T5.
Further, capacity cutoff is additionally provided in the computing module, for protecting battery.
Further, the grading module is used to the battery of the K values in A carrying out combo, by B grades and C grades progress Battery up to specification carries out combo after second of partial volume and third time partial volume.
Self discharge detection method, includes the following steps after one kind provided by the invention is charged:
S1:To carrying out first time partial volume in the lower battery of state-of-charge time, battery capacity C is calculated;
S2:After the battery static placement T1 times, the open-circuit voltage OCV1 of battery is tested, again by the static placement T2 of battery After time, the open-circuit voltage OCV2 of battery is tested, obtains the self-discharge rate K of battery, wherein K=(OCV1-OCV2)/T2-12h;
S3:Battery is divided into A, B, C and D grades according to K values, the bad battery in D grades is put in storage, the battery in B and C grades Second of partial volume is carried out, the battery for being filled with capacity less than the first pre-value of total capacity places the T3 times, will be filled with capacity higher than the The battery of one pre-value carries out third time partial volume after shelving the T4 times, will continuously be filled with capacity three times higher than the first pre-value as bad Product are put in storage.Using above-mentioned scheme, partial volume is carried out under state-of-charge to battery, and obtain battery capacity C, further according to battery Open-circuit voltage OCV1 and OCV2 obtain the self-discharge rate K of battery, carry out stepping to battery according to K, the battery in A grades can be direct Combo is carried out, B grades carry out second and third time partial volume with the battery in C grades, and the battery in B grades and C grades is up to specification Carry out combo, to alleviate battery testing overlong time, the technology that opponent's battery loss is larger and technique is cumbersome in the prior art Problem.
A kind of battery check device provided by the invention, the battery check device include:Computing module, for in lotus The lower battery of electricity condition time carries out first time partial volume, and battery capacity C is calculated;Test module, for testing static placement T1 Battery after time tests the open-circuit voltage OCV1 of battery, again by after the battery static placement T2 times, tests the open circuit of battery Voltage OCV2 obtains the self-discharge rate K of battery, wherein K=(OCV1-OCV2)/T2-12h;Grading module, for by battery root It is divided into A, B, C and D grades according to K values, the bad battery in D grades is put in storage, the battery in B and C grades carries out second of partial volume, is filled with Capacity places the T3 times less than the battery of the first pre-value of total capacity, when will be filled with capacity and shelve T4 higher than the battery of the first pre-value Between after carry out third time partial volume, will continuously be filled with three times capacity higher than the first pre-value as defective products storage.The beneficial effect generated Fruit is identical with the advantageous effect of charged rear self discharge detection method.
Description of the drawings
It, below will be to specific in order to illustrate more clearly of the specific embodiment of the invention or technical solution of the prior art Embodiment or attached drawing needed to be used in the description of the prior art are briefly described, it should be apparent that, in being described below Attached drawing is some embodiments of the present invention, for those of ordinary skill in the art, before not making the creative labor It puts, can also be obtained according to these attached drawings other attached drawings.
Fig. 1 is the flow diagram of charged rear self discharge detection method provided in an embodiment of the present invention;
Fig. 2 is the high-level schematic functional block diagram of battery check device provided in an embodiment of the present invention.
Specific embodiment
Technical scheme of the present invention is clearly and completely described below in conjunction with attached drawing, it is clear that described implementation Example is part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, ordinary skill Personnel's all other embodiments obtained without making creative work, shall fall within the protection scope of the present invention.
In the description of the present invention, it should be noted that such as occur term " " center ", " on ", " under ", "left", "right", " vertical ", " level ", " interior ", " outer " etc., indicated by orientation or position relationship be based on orientation shown in the drawings or position Relationship is for only for ease of the description present invention and simplifies description rather than instruction or imply that signified device or element must have There is specific orientation, with specific azimuth configuration and operation, therefore be not considered as limiting the invention.In addition, as occurred Term " first ", " second ", " third " are only used for description purpose, and it is not intended that instruction or hint relative importance.
In the description of the present invention, it should be noted that unless otherwise clearly defined and limited, term " peace such as occur Dress ", " connected ", " connection " should be interpreted broadly, for example, it may be being fixedly connected or being detachably connected or integrally Connection;Can be mechanical connection or electrical connection;It can be directly connected, can also be indirectly connected by intermediary, It can be the connection inside two elements.For the ordinary skill in the art, can above-mentioned art be understood with concrete condition The concrete meaning of language in the present invention.
Fig. 1 is the flow diagram of charged rear self discharge detection method provided in an embodiment of the present invention;As shown in Figure 1, this The charged rear self discharge detection method of one kind that invention provides, includes the following steps:
S1:To carrying out first time partial volume in the lower battery of state-of-charge time, battery capacity C is calculated;
S2:After the battery static placement T1 times, the open-circuit voltage OCV1 of battery is tested, again by the static placement T2 of battery After time, the open-circuit voltage OCV2 of battery is tested, obtains the self-discharge rate K of battery, wherein K=(OCV1-OCV2)/T2-12h;
S3:Battery is divided into A, B, C and D grades according to K values, the bad battery in D grades is put in storage, the battery in B and C grades Second of partial volume is carried out, is filled with capacity less than total capacity
The battery of the first pre-value place the T3 times, being filled with capacity, to shelve the T4 times laggard higher than the battery of the first pre-value Row third time partial volume will continuously be filled with capacity and is put in storage higher than the first pre-value as defective products three times.
Wherein, the T1 times be 12-14h, the T2 times be 84 ± 2h, the T3 times be 72h, the T4 times be 120h, the first pre-value 3% for total capacity.
Wherein, 0.097mV/h<A grades≤0.306mV/h, B grades≤0.097mV/h, 0.306mV/h<C grades≤0.417mV/ H, D grades>0.417mV/h.
Self discharge detection method, includes the following steps after one kind provided by the invention is charged:
S1:To carrying out first time partial volume in the lower battery of state-of-charge time, battery capacity C is calculated;
S2:After the battery static placement T1 times, the open-circuit voltage OCV1 of battery is tested, again by the static placement T2 of battery After time, the open-circuit voltage OCV2 of battery is tested, obtains the self-discharge rate K of battery, wherein K=(OCV1-OCV2)/T2-12h;
S3:Battery is divided into A, B, C and D grades according to K values, the bad battery in D grades is put in storage, the battery in B and C grades Second of partial volume is carried out, is filled with capacity less than total capacity
The battery of the first pre-value place the T3 times, being filled with capacity, to shelve the T4 times laggard higher than the battery of the first pre-value Row third time partial volume will continuously be filled with capacity and is put in storage higher than the first pre-value as defective products three times.Using above-mentioned scheme, to electricity Pond carries out partial volume under state-of-charge, and obtains battery capacity C, and battery is obtained further according to the open-circuit voltage OCV1 and OCV2 of battery Self-discharge rate K, stepping is carried out to battery according to K, the battery in A grade can directly carry out combo, B grades with C grades in battery Second and third time partial volume are carried out, by the carry out combo up to specification of the battery in B grades with C grades, to alleviate the prior art Middle battery testing overlong time, opponent's battery loss are larger and the technical issues of technique is cumbersome.
On the basis of above-described embodiment, further, first time partial volume includes the following steps:
S10:First time constant-current charge, second of constant-current charge and first time constant-voltage charge, so that the voltage of battery reaches Second pre-value;
S11:First time constant-current discharge, third time constant-current charge and second of constant-voltage charge, so that cell voltage reaches Three pre-values;
S12:Second of constant-current discharge, the 4th constant-current charge and third time constant-voltage charge, so that cell voltage reaches again It is secondary to arrive third pre-value;
S13:Third time constant-current discharge, the 5th constant-current charge and the 4th constant-voltage charge, so that cell voltage reaches again It is secondary to arrive third pre-value.
Wherein, the second pre-value is 4100mV, and third pre-value is 3650mV.
Table 1 is the specific work step of partial volume
In the present embodiment, battery places 2min before first time constant-current charge, and constant-current charge time first time is 120min after first time constant-current charge is completed, carries out second of constant-current charge, and second of constant-current charge time is 200min, Upper voltage limit 4100mV is additionally provided in first time constant-current charge and second of constant-current charge, the first constant voltage charging time is 200min is provided with cut-off current in first time constant-voltage charge, 2min is placed after the completion of the first constant-voltage charge, carries out for the first time Constant-current discharge, the lower voltage limit that when first time constant-current discharge is set are 2000mV, and the time of first time constant-current discharge is 25min after placing 2min again after first time constant-current discharge, carries out third time constant-current charge, the time of third time constant-current charge For 25min, the upper voltage limit that when third time constant-current charge is set is 3650mV, and second of constant pressure is carried out after third time constant-current charge Charging, second of constant-voltage charge 50min, the cut-off current of second of constant-voltage charge are 600mA, after the completion of second of constant-voltage charge Battery is placed into 2min, carries out second of constant-current discharge, the lower voltage limit of second of constant-current discharge is 2000mV, second of constant current It places 2min after electric discharge, carries out the 4th constant-current charge 25min, the upper voltage limit of first time constant-current charge is 3650mV, the 4th Third time constant-voltage charge 50min is carried out after secondary constant-current charge, cut-off current 600mA is set during third time constant-voltage charge, completes the Battery is placed into 2min after constant-voltage charge three times, carries out third time constant-current discharge 200min, during third time constant-current discharge under setting Voltage limit is 2500mV, places 2min after completing third constant-current discharge, carries out the 5th constant-current charge and the 4th constant-voltage charge Time be 200min, respectively set upper voltage limit 3650mV and cut-off current 600mA, place 2min again after the completion, this Sample can ensure the quality of battery.
On the basis of above-described embodiment, further, the mode that obtains of the battery capacity C is:Third time constant current is put The voltage of battery need to be made to reach the 4th pre-value, and third time constant-current discharge reaches time of the 4th pre-value for T5 when electric, third time Electric current constant I during constant-current discharge;Wherein C=I × T5.
Wherein, I=2400mA.
In the present embodiment, in third time constant-current discharge, the time that cell voltage is reduced to 2500mV from 3650mV is T5, and electric current during third time constant-current discharge is constant for I, so as to obtain battery capacity C.
On the basis of above-described embodiment, further, capacity cutoff is additionally provided in the first time partial volume, for Protect battery.
In the present embodiment, the setting of capacity cutoff can be such that battery is limited by many condition, to protect battery.
On the basis of above-described embodiment, further, the battery of the K values in A carries out combo, by B grade with C grades into Battery up to specification carries out combo after second of partial volume of row and third time partial volume.
Wherein, can also A, B and C grades of battery be subjected to mixing combo.
In this implementation, battery of the K values in A grades is carried out individually to carry out combo, second of partial volume of B grade and C grade progress with Battery up to specification carries out combo after third time partial volume.To form whole battery.
Fig. 2 is the high-level schematic functional block diagram of battery check device provided in an embodiment of the present invention.It is as shown in Fig. 2, of the invention A kind of battery check device provided, the battery check device include:
Computing module, for carrying out first time partial volume, and battery capacity C is calculated in the lower battery of state-of-charge time;
Test module for testing the battery after the static placement T1 times, tests the open-circuit voltage OCV1 of battery, again will After the battery static placement T2 times, the open-circuit voltage OCV2 of battery is tested, obtains the self-discharge rate K, wherein K=(OCV1- of battery OCV2)/T2-12h;
Grading module for battery to be divided into A, B, C and D grades according to K values, the bad battery in D grades is put in storage, B and C Battery in shelves carries out second of partial volume, and the battery for being filled with capacity less than the first pre-value of total capacity places the T3 times, will be filled with Capacity carries out third time partial volume after shelving the T4 times higher than the battery of the first pre-value, and it is pre- higher than first will to be continuously filled with capacity three times Value is put in storage as defective products.
Further, the computing module is additionally operable to first time constant-current charge, second of constant-current charge and first time constant pressure Charging, so that the voltage of battery reaches the second pre-value;First time constant-current discharge, third time constant-current charge and second of constant pressure are filled Electricity, so that cell voltage reaches third pre-value;Second of constant-current discharge, the 4th constant-current charge and third time constant-voltage charge, with Reach cell voltage and arrive third pre-value again;Third time constant-current discharge, the 5th constant-current charge and the 4th constant-voltage charge, with Reach cell voltage and arrive third pre-value again.
Further, the mode that obtains of the battery capacity C is:When third time constant-current discharge the voltage of battery need to reach 4th pre-value, and third time constant-current discharge reaches time of the 4th pre-value for T5, electric current constant I during third time constant-current discharge;Its Middle C=I × T5.
Further, capacity cutoff is additionally provided in the computing module, for protecting battery.
Further, the grading module is used to the battery of the K values in A carrying out combo, by B grades and C grades progress Battery up to specification carries out combo after second of partial volume and third time partial volume.
In the present embodiment, battery check device is identical with the advantageous effect of charged rear self discharge detection method, repeats no more.
Finally it should be noted that:The above embodiments are only used to illustrate the technical solution of the present invention., rather than its limitations;To the greatest extent Pipe is described in detail the present invention with reference to foregoing embodiments, it will be understood by those of ordinary skill in the art that:Its according to Can so modify to the technical solution recorded in foregoing embodiments either to which part or all technical features into Row equivalent replacement;And these modifications or replacement, various embodiments of the present invention technology that it does not separate the essence of the corresponding technical solution The range of scheme.

Claims (10)

1. a kind of charged rear self discharge detection method, which is characterized in that include the following steps:
S1:To carrying out first time partial volume in the lower battery of state-of-charge time, battery capacity C is calculated;
S2:After the battery static placement T1 times, the open-circuit voltage OCV1 of battery is tested, again by the battery static placement T2 times Afterwards, the open-circuit voltage OCV2 of battery is tested, obtains the self-discharge rate K of battery, wherein K=(OCV1-OCV2)/T2-12h;
S3:Battery is divided into A, B, C and D grades according to K values, the bad battery in D grades is put in storage, the battery in B and C grades carries out Second of partial volume, the battery for being filled with capacity less than the first pre-value of total capacity place the T3 times, it is pre- higher than first will to be filled with capacity The battery of value carries out third time partial volume after shelving the T4 times, will continuously be filled with capacity three times and enters higher than the first pre-value as defective products Library.
2. charged rear self discharge detection method according to claim 1, which is characterized in that first time partial volume includes following step Suddenly:
S10:First time constant-current charge, second of constant-current charge and first time constant-voltage charge, so that the voltage of battery reaches second Pre-value;
S11:First time constant-current discharge, third time constant-current charge and second of constant-voltage charge, so as to reach third pre- for cell voltage Value;
S12:Second of constant-current discharge, the 4th constant-current charge and third time constant-voltage charge, are arrived again so that cell voltage reaches Third pre-value;
S13:Third time constant-current discharge, the 5th constant-current charge and the 4th constant-voltage charge, are arrived again so that cell voltage reaches Third pre-value.
3. charged rear self discharge detection method according to claim 2, which is characterized in that the battery capacity C's obtains Mode is:The voltage of battery need to be made to reach the 4th pre-value, and third time constant-current discharge reaches the 4th in advance during third time constant-current discharge The time of value is T5, electric current constant I during third time constant-current discharge;Wherein C=I × T5.
4. charged rear self discharge detection method according to claim 3, which is characterized in that also set in the first time partial volume Capacity cutoff is equipped with, for protecting battery.
5. it is according to claim 1 it is charged after self discharge detection method, which is characterized in that the battery of the K values in A into Battery up to specification after B grades and C grades second of partial volume of progress and third time partial volume is carried out combo by row combo.
6. a kind of battery check device, which is characterized in that the battery check device includes:
Computing module, for carrying out first time partial volume, and battery capacity C is calculated in the lower battery of state-of-charge time;
Test module for testing the battery after the static placement T1 times, tests the open-circuit voltage OCV1 of battery, again by battery After the static placement T2 times, the open-circuit voltage OCV2 of battery is tested, obtains the self-discharge rate K, wherein K=(OCV1- of battery OCV2)/T2-12h;
Grading module for battery to be divided into A, B, C and D grades according to K values, the bad battery in D grades is put in storage, in B and C grades Battery carry out second of partial volume, be filled with capacity less than total capacity the first pre-value battery place the T3 times, capacity will be filled with Battery higher than the first pre-value is shelved third time partial volume is carried out after the T4 times, will continuously be filled with capacity three times higher than the first pre-value work It is put in storage for defective products.
7. battery check device according to claim 6, which is characterized in that the computing module is additionally operable to first time constant current Charging, second of constant-current charge and first time constant-voltage charge, so that the voltage of battery reaches the second pre-value;First time constant current is put Electricity, third time constant-current charge and second of constant-voltage charge, so that cell voltage reaches third pre-value;Second of constant-current discharge, Four constant-current charges and third time constant-voltage charge, so that cell voltage reaches arrives third pre-value again;Third time constant-current discharge, Five constant-current charges and the 4th constant-voltage charge, so that cell voltage reaches arrives third pre-value again.
8. battery check device according to claim 7, which is characterized in that the mode that obtains of the battery capacity C is:The The voltage of battery need to be made to reach the 4th pre-value during constant-current discharge three times, and third time constant-current discharge reaches time of the 4th pre-value and is T5, electric current constant I during third time constant-current discharge;Wherein C=I × T5.
9. battery check device according to claim 8, which is characterized in that cut-off is additionally provided in the computing module and is held Amount, for protecting battery.
10. according to claim 9 any one of them battery check device, which is characterized in that the grading module is used for K values The battery in A carries out combo, by battery up to specification after B grades and C grades second of partial volume of progress and third time partial volume Carry out combo.
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Cited By (3)

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CN109435761A (en) * 2018-10-17 2019-03-08 北京经纬恒润科技有限公司 A kind of battery voltage monitoring method and entire car controller
CN110297191A (en) * 2019-08-07 2019-10-01 深圳市思商科技有限公司 A kind of self-discharge of battery test method
CN110531282A (en) * 2019-10-29 2019-12-03 深圳市普兰德储能技术有限公司 The application scenarios classification method of retired power battery

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