CN113419181A - Working condition testing method for electric bicycle battery - Google Patents
Working condition testing method for electric bicycle battery Download PDFInfo
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- CN113419181A CN113419181A CN202110645392.7A CN202110645392A CN113419181A CN 113419181 A CN113419181 A CN 113419181A CN 202110645392 A CN202110645392 A CN 202110645392A CN 113419181 A CN113419181 A CN 113419181A
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- 238000012360 testing method Methods 0.000 title claims abstract description 127
- 238000004088 simulation Methods 0.000 claims abstract description 26
- 230000014759 maintenance of location Effects 0.000 claims abstract description 18
- 230000007774 longterm Effects 0.000 claims abstract description 13
- 230000008859 change Effects 0.000 claims abstract description 12
- 208000028659 discharge Diseases 0.000 claims description 51
- 238000000034 method Methods 0.000 claims description 42
- 230000008569 process Effects 0.000 claims description 31
- 238000007599 discharging Methods 0.000 claims description 26
- 238000010280 constant potential charging Methods 0.000 claims description 4
- 238000010277 constant-current charging Methods 0.000 claims description 4
- 230000001351 cycling effect Effects 0.000 claims description 3
- 238000010281 constant-current constant-voltage charging Methods 0.000 claims description 2
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 abstract description 6
- 229910052744 lithium Inorganic materials 0.000 abstract description 6
- 238000007600 charging Methods 0.000 description 14
- 238000000275 quality assurance Methods 0.000 description 11
- 238000010998 test method Methods 0.000 description 5
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 4
- 238000004364 calculation method Methods 0.000 description 4
- 229910001416 lithium ion Inorganic materials 0.000 description 4
- 238000010438 heat treatment Methods 0.000 description 3
- 238000012031 short term test Methods 0.000 description 3
- 239000002253 acid Substances 0.000 description 2
- 238000012937 correction Methods 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 125000004122 cyclic group Chemical group 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
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- 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]
- G01R31/382—Arrangements for monitoring battery or accumulator variables, e.g. SoC
- G01R31/3842—Arrangements for monitoring battery or accumulator variables, e.g. SoC combining voltage and current measurements
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- 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
Abstract
The invention discloses a working condition testing method of an electric bicycle battery. The problem that the difference between the test of the lithium battery of the electric bicycle and the actual working condition is large in the prior art is solved; the invention comprises the following steps: s1: putting a battery to be tested into a high-low temperature box with a preset program; s2: the high-low temperature box simulates the temperature change circulation of four seasons for a plurality of times, and each simulation season comprises a plurality of different simulation stage temperatures; s3: carrying out a plurality of times of three-layer nested circulation battery charge and discharge tests at the temperature of each simulation stage; the three-layer nested cycle comprises a multi-stage discharge cycle, a charge-discharge cycle and an overall cycle; s4: and correcting the capacity retention rate obtained by the test, and evaluating the long-term service performance of the battery. The influence of abundant ambient temperature, electric current, charge-discharge characteristic and calendar life carries out the simulation of operating condition test, more can truly reflect the group battery performance under operating condition rides, has shortened test cycle simultaneously.
Description
Technical Field
The invention relates to the field of lithium battery testing, in particular to a working condition testing method for an electric bicycle battery.
Background
Electric bicycles (two-wheeled vehicles) are receiving more and more social attention as main travel tools for residents in cities and towns and rural areas in China. According to statistics, the quantity of electric bicycles kept in China is nearly 3 hundred million, and the annual output and sales volume is more than 2500 million. The electric bicycle is widely applied to commuting, picking up and delivering children to learn, shopping, short-distance traveling and the like.
As people demand electric bicycles more and more, their performances are also concerned by more and more people. At present, batteries for electric bicycles are mainly lead-acid batteries, and although the occupancy rate of lithium batteries in the field of electric bicycles is less than 20%, the permeability and the trend of replacing lead-acid batteries are accelerated. The battery performance is the most critical item affecting the performance of the electric bicycle, because the price of the battery occupies more than 30% of the cost of the electric bicycle, and the performances of the battery, such as capacity, safety, high and low temperature, circulation and the like, affect the riding mileage, safety, riding experience, service life and the like of the electric bicycle. The performance test of the lithium battery is particularly important, and particularly for the test of the cycle life.
The current mainstream cycle test comprises high temperature cycle and normal temperature cycle, and the general formula is under constant temperature: constant-current constant-voltage charging-laying aside-constant-current discharging-laying aside. However, the difference between the test mode and the actual working condition of the battery pack is large, the electric vehicle is in a dynamic state all the time in the actual riding process, the discharge current and the ambient temperature are in the change, the calendar life is not considered in the program test, the riding life of the general electric vehicle is three to five years, and the test process is generally completed only about 6 months.
Application numbers CN202010560279.4, CN202010559288.1, and cn202010559309.x respectively disclose a method for predicting the working condition and life stage of a lithium ion battery for a vehicle based on summer climate, a method for deducing the heating working condition and life stage of a lithium ion battery system in winter, and a method for comprehensively controlling the working condition of the lithium ion battery in spring and autumn, which are specific to the lithium ion battery with a BMS temperature management system for a vehicle, but an electric bicycle has no BMS management system due to cost, and has no temperature reduction in summer, no heating in winter, completely different environments in the use process, different working modes of the battery, and no influence of calendar life is considered in the method, and it is not rigorous to evaluate the long-term use performance of the battery only by means of short-term test results.
Disclosure of Invention
The invention mainly solves the problem that the difference between the test of the lithium battery of the electric bicycle in the prior art and the actual working condition is large; the working condition testing method of the electric bicycle battery is provided, the influence of the environmental temperature, the current, the charging and discharging characteristics and the calendar life is fully considered to simulate the actual working condition test, the performance of the battery pack under the actual working condition riding can be reflected more truly, and the testing period is shortened.
The technical problem of the invention is mainly solved by the following technical scheme:
a working condition testing method of an electric bicycle battery comprises the following steps:
s1: putting a battery to be tested into a high-low temperature box with a preset program;
s2: the high-low temperature box simulates the temperature change circulation of four seasons for a plurality of times, and each simulation season comprises a plurality of different simulation stage temperatures;
s3: carrying out a plurality of times of three-layer nested circulation battery charge and discharge tests at the temperature of each simulation stage; the three-layer nested cycle comprises a multi-stage discharge cycle, a charge-discharge cycle and an overall cycle;
s4: and correcting the capacity retention rate obtained by the test, and evaluating the long-term service performance of the battery.
The test is closer to the actual use scene by simulating four seasons at different temperature stages; through the charge-discharge test of three-layer nested circulation, the charge-discharge frequency and the riding habit in the actual use process are more similar; the performance obtained by the short-term test data is corrected and evaluated to obtain the long-term use performance, so that the data is closer to reality, and the test period is shortened. The battery of this scheme does not need battery management system, and the battery also does not have heating or heat sink simultaneously, and the group battery is applied to electric bicycle, electric tricycle or instrument of riding instead of walk generally.
Preferably, each simulation season comprises three simulation stage temperatures, and the holding time of each simulation stage temperature is 100-110 h; setting the temperature in the simulation stage according to the average temperature of the target area in the past year; the high-low temperature box simulates three temperature change cycles in four seasons.
The temperature is adjusted according to the target market, and the temperature is closer to the actual use scene of the target area, so that the test result is more reliable, and the performance design of the product can be guided. At present, the battery of the electric bicycle generally requires three years of quality guarantee (the capacity retention rate is more than or equal to 80%) according to the standards of the whole automobile factory and the industry, the maximum use frequency (charging time is more than half an hour and a cycle is calculated) in one year is about 200 times and the maximum use frequency is 600 times in three years according to the civil market research and riding requirements, and the performance of the battery of the electric bicycle is tested according to the standards.
Preferably, the battery charge and discharge test comprises the following processes:
A. standing for a first rated time;
B. constant-current and constant-voltage charging until the current is cut off;
C. standing for a second rated time;
D. multi-stage constant current discharge, wherein each stage of constant current discharge is provided with discharge time;
E. cycling the multi-stage constant current discharge in the process D until the cut-off voltage;
F. the process A to E is circulated for 10 times;
G. discharging at constant current until the cut-off voltage of the battery module;
H. the process A to G is circulated for 60 times.
Setting a test flow according to national standard test requirements, the current of a charger, the rated power and the variation characteristics of a motor of the whole vehicle and a common riding habit; by adopting the three-layer nested cyclic charge-discharge process, the battery characteristics and the riding habits are more closely attached, so that the test data are more reliable, the test period is shortened, and the full life cycle test is simulated.
Preferably, the process D includes:
d1: in the first constant current discharge stage, discharging for 1 minute at a current of 1-1.5 ℃;
d2: in the second constant current discharge stage, discharging for 3 minutes at a current of 0.5-0.8 ℃;
d3: in the third constant current discharge stage, discharging for 1 minute at the current of 0.8-1C;
d4: in the fourth constant current discharge stage, discharging for 3 minutes at a current of 0.3-0.5 ℃;
wherein C is the battery rated capacity.
The current nonlinear change characteristic of the real working condition is simulated, and the test process is set according to the riding habit, so that the data are closer to the real data.
Preferably, the voltage in the constant-current and constant-voltage charging process is the output voltage of the charger; the cutoff voltage of the multi-stage constant current discharge is 10-20% SOC.
Setting a test flow according to national standard test requirements, the current of a charger, the rated power and the variation characteristic of a motor of the whole vehicle and a general riding habit (the charging electric quantity is 100% SOC, and the discharging electric quantity is generally controlled to be 10-20% SOC); so that the result is closer to the real data.
Preferably, the correction process is as follows:
when T-TTestingWhen the ratio is more than or equal to 700, Y is equal to YTesting*(T-TTesting)-6E-3；
When 350 < T-TTestingWhen < 700, Y ═ YTesting*(T-TTesting)-3E-3；
Wherein T is long-term service life;
TtestingThe time of actual test;
y is capacity retention for long-term use;
YtestingIs the capacity retention rate actually tested.
Considering that the tested result only reflects the performance in a short period, and the service life of the client is longer, the influence of the calendar life is considered to correct the test result.
The invention has the beneficial effects that:
1. the four-season three-layer nested cycle charge and discharge test at different temperature stages is simulated, so that the charge and discharge frequency and the riding habit in the actual use process are more similar.
2. The performance obtained by the short-term test data is corrected and evaluated to obtain the long-term use performance, so that the data is closer to reality, and the test period is shortened.
Drawings
Fig. 1 is a flow chart of the operation condition testing of the electric bicycle battery according to the invention.
Detailed Description
The technical scheme of the invention is further specifically described by the following embodiments and the accompanying drawings.
The first embodiment is as follows:
the working condition testing method of the electric bicycle battery in the embodiment, as shown in fig. 1, includes the following steps:
s1: the battery to be tested is placed in a high-low temperature box with a preset program. In this embodiment, the manufactured 48V12Ah battery module is placed in a high and low temperature chamber with programmed settings.
At present, the battery of the electric bicycle generally requires three years of quality guarantee (the capacity retention rate is more than or equal to 80%) according to the standards of the whole automobile factory and the industry, the maximum use frequency (charging time is more than half an hour and a cycle is calculated) in one year is about 200 times and the maximum use frequency is 600 times in three years according to the civil market research and riding requirements, and in the embodiment, the performance of the battery of the electric bicycle is tested according to the standards.
S2: the high-low temperature box simulates the temperature change circulation of four seasons for a plurality of times, and each simulation season comprises a plurality of different simulation stage temperatures.
Each simulation season comprises three simulation stage temperatures, and the holding time of each simulation stage temperature is 100-110 h, in the embodiment, 105 h.
The high-low temperature box simulates three temperature change cycles in four seasons, and the battery can be tested for 200 cycles in four seasons. The equation in the high and low temperature cabinet is shown in table 1:
TABLE 1. equation in high and Low temperature Chambers
Setting the temperature in the simulation stage according to the average temperature of the target area in the past year; such as the difference in temperature between the southern market and the northern market. In this embodiment, the formula in the hot and cold box is shown in table 2:
TABLE 2 procedure in the high and low temperature cabinet of example one
The above temperature settings are based on the average temperature of the target use area (middle) in the past year.
S3: carrying out a plurality of times of three-layer nested circulation battery charge and discharge tests at the temperature of each simulation stage; the three-layer nested cycle comprises a multi-stage discharge cycle, a charge-discharge cycle and an overall cycle.
The battery charging and discharging test comprises the following processes:
A. standing for a first rated time; in this example, it was left standing for 90 minutes.
B. Constant-current and constant-voltage charging until the current is cut off; the voltage in the constant-current constant-voltage charging process is the output voltage of the charger; the cutoff voltage of the multi-stage constant current discharge is 10-20% of SOC voltage.
C. Standing for a second rated time; in this example, it was left standing for 30 minutes.
D. And (4) multi-stage constant current discharge, wherein each stage of constant current discharge is provided with a discharge time.
D1: in the first constant current discharge stage, discharging for 1 minute at a current of 1-1.5 ℃;
d2: in the second constant current discharge stage, discharging for 3 minutes at a current of 0.5-0.8 ℃;
d3: in the third constant current discharge stage, discharging for 1 minute at the current of 0.8-1C;
d4: and in the fourth constant current discharge stage, discharging for 3 minutes at a current of 0.3-0.5 ℃.
E. Cycling the multi-stage constant current discharge in the process D until the cut-off voltage;
F. the process A to E is circulated for 10 times;
G. discharging at constant current until the cut-off voltage of the battery module;
H. the process A to G is circulated for 60 times.
According to the national standard test requirements, the current of the charger, the rated power and the variation characteristics (current non-linearity) of the motor of the whole vehicle and the common riding habits (the charging electric quantity is 100% SOC, and the discharging electric quantity is generally controlled to be 10-20% SOC), the test flow is set, and the specific battery charging and discharging test process is shown in Table 3:
TABLE 3 Battery Charge/discharge test procedure
Wherein: the loop is nested in three layers, the 8 th step is a first layer loop, the 9 th step is a second layer loop, and the 11 th step is a third layer loop.
The battery charge and discharge test procedure of this example is shown in table 4:
TABLE 4 Battery Charge and discharge procedure of example one
S4: and correcting the capacity retention rate obtained by the test, and evaluating the long-term service performance of the battery.
Considering that the tested result only reflects the performance in a short period, and the service life of the client is longer, the influence of the calendar life is considered to correct the test result. The correction process is as follows:
when T-TTestingWhen the ratio is more than or equal to 700, Y is equal to YTesting*(T-TTesting)-6E-3；
When 350 < T-TTestingWhen < 700, Y ═ YTesting*(T-TTesting)-3E-3；
Wherein T is long-term service life;
TtestingThe time of actual test;
y is capacity retention for long-term use;
YtestingIs the capacity retention rate actually tested.
In the present embodiment, the capacity retention ratio Y is determined according to the test data in step S3Testing89.5%, test time (day) TTesting52.5, the customer service time (three years according to quality assurance) T1095, and the formula Y is substituted into the formula YTesting*(T-TTesting)-6E-3＝89.5％*(1095-52.5)-6E-3＝85.84％；
According to the test and calculation results of the step S4, the battery pack can be used for three years under the full working condition (the capacity retention rate is more than 80%), and the product can be put into the middle market with low temperature.
The scheme of this embodiment fully considers the influence of ambient temperature, electric current, charge-discharge characteristic and calendar life and carries out the simulation of operating condition test, more can truly reflect the group battery performance under operating condition rides, has shortened test cycle simultaneously.
Example two:
in this implementation, the manufactured 48V12Ah battery module is placed in a high and low temperature chamber with programming.
The program setting of the high-low temperature box is three times according to the temperature change cycle of four seasons, the battery can be tested for 200 cycles in the four seasons, and the program in the high-low temperature box of the embodiment is shown in the table 5:
TABLE 5 procedure in high and low temperature cabinet of example two
The above temperature setting is based on the average temperature in the last year of the target area of use (south).
The test flow is set according to the national standard test requirements, the current of the charger, the rated power and the variation characteristic (current non-linearity) of the motor of the whole vehicle and the common riding habits (the charging electric quantity is 100% SOC, and the discharging electric quantity is generally controlled to be 10-20% SOC), and the battery charging and discharging test process in the embodiment is shown in Table 6:
TABLE 6 Battery Charge/discharge test procedure of example two
Wherein: the loop is nested in three layers, the 8 th step is a first layer loop, the 9 th step is a second layer loop, and the 11 th step is a third layer loop.
Correcting the test result, and obtaining the capacity retention rate Y according to the test data of the stepsTesting83.1%, test time (day) TTesting52.5, the customer service time (three years according to quality assurance) T1095, and the formula Y is substituted into the formula YTesting*(T-TTesting)-6E-3＝83.1％*(1095-52.5)-6E-3＝79.70％；
If the two years of quality assurance T is 730, the formula Y is substituted into YTesting*(T-TTesting)-3E-3＝83.1％*(730-52.5)-3E-3＝81.84％；
According to the test and calculation results, the high-temperature attenuation of the battery pack is fast under the influence of high-temperature weather in south, and the quality assurance of the battery pack under the full working condition for three years has certain risks (the capacity retention rate is less than 80%), and the quality assurance is preferably carried out for two years for the sake of caution.
Example three:
in this embodiment, the manufactured 48V12Ah battery module is placed in a high and low temperature chamber with programmed settings.
The program in the high-low temperature box is set to cycle three times according to the temperature change of four seasons, the battery can be tested for 200 cycles in the four seasons, and the program in the high-low temperature box in the embodiment is shown in the table 7:
TABLE 7 equation in high and low temperature box of example III
The above temperature settings are based on the average air temperature of the target area of use (northeast) in the past year.
The test flow is set according to the national standard test requirements, the current of the charger, the rated power and the variation characteristic (current non-linearity) of the motor of the whole vehicle and the common riding habits (the charging electric quantity is 100% SOC, and the discharging electric quantity is generally controlled to be 10-20% SOC), and the battery charging and discharging test process in the embodiment is shown in Table 8:
TABLE 8 Battery Charge/discharge test procedure in EXAMPLE III
Wherein: the loop is nested in three layers, the 8 th step is a first layer loop, the 9 th step is a second layer loop, and the 11 th step is a third layer loop.
Correcting the test result, and according to the test data, maintaining the capacity ratio YTesting82.4%, test time (day) TTesting52.5, the customer service time (three years according to quality assurance) T1095, and the formula Y is substituted into the formula YTesting*(T-TTesting)-6E-3＝82.4％*(1095-52.5)-6E-3＝79.02％；
If the two years of quality assurance T is 730, the formula Y is substituted into YTesting*(T-TTesting)-3E--3＝82.4％*(730-52.5)-3E-3＝80.80％；
According to the first test and calculation results, the influence of the extremely cold weather in the northeast, the lithium analysis attenuation of the battery pack due to low-temperature charging is fast, and the quality assurance of the battery pack under the full working condition for three years has certain risks (the capacity retention rate is less than 80%), so that the quality assurance is better for two years with care.
Example four:
in this embodiment, the manufactured 60V20Ah battery module is placed in a high and low temperature box with programmed settings.
The program in the hot and cold box is set to cycle three times according to the temperature change of four seasons, the battery can be tested for 200 cycles in four seasons, and the program in the hot and cold box of this embodiment is shown in table 9:
TABLE 9 equation in the high and low temperature box of example four
The above temperature settings are based on the average temperature of the target use area over the years.
The test flow is set according to the national standard test requirements, the current of the charger, the rated power and the variation characteristic (current non-linearity) of the motor of the whole vehicle, and the common riding habits (the charging electric quantity is 100% SOC, and the discharging electric quantity is generally controlled to be 10-20% SOC), and the battery charging and discharging test process in the embodiment is shown in Table 10:
TABLE 10 Battery Charge/discharge test procedure in EXAMPLE four
Wherein: the loop is nested in three layers, the 8 th step is a first layer loop, the 9 th step is a second layer loop, and the 11 th step is a third layer loop.
4. Correcting the test result, and obtaining the capacity retention rate Y according to the test data in the step 3Testing84.2%, test time (day) YTesting52.5, the customer service time (three years by warranty) T1095, and the formula is substituted:
Y＝Ytesting*(T-TTesting)-6E-3＝84.2％*(1095-52.5)-6E-3＝80.75％；
According to the test and calculation results, the quality assurance of the battery pack under the all-working-condition for three years is barely in accordance with the standard, and the quality assurance is preferably carried out for two years for the sake of caution, and the use area should not be in the north with lower temperature or the south with higher temperature.
It should be understood that the examples are for illustrative purposes only and are not intended to limit the scope of the present invention. Further, it should be understood that various changes or modifications of the present invention may be made by those skilled in the art after reading the teaching of the present invention, and such equivalents may fall within the scope of the present invention as defined in the appended claims.
Claims (6)
1. A working condition testing method of an electric bicycle battery is characterized by comprising the following steps:
s1: putting a battery to be tested into a high-low temperature box with a preset program;
s2: the high-low temperature box simulates the temperature change circulation of four seasons for a plurality of times, and each simulation season comprises a plurality of different simulation stage temperatures;
s3: carrying out a plurality of times of three-layer nested circulation battery charge and discharge tests at the temperature of each simulation stage; the three-layer nested cycle comprises a multi-stage discharge cycle, a charge-discharge cycle and an overall cycle;
s4: and correcting the capacity retention rate obtained by the test, and evaluating the long-term service performance of the battery.
2. The working condition testing method of the electric bicycle battery as claimed in claim 1, wherein each simulation season comprises three simulation stage temperatures, and the holding time of each simulation stage temperature is 100-110 h; setting the temperature in the simulation stage according to the average temperature of the target area in the past year; the high-low temperature box simulates three temperature change cycles in four seasons.
3. The method for testing the working condition of the battery of the electric bicycle as claimed in claim 1 or 2, wherein the battery charge and discharge test comprises the following processes:
A. standing for a first rated time;
B. constant-current and constant-voltage charging until the current is cut off;
C. standing for a second rated time;
D. multi-stage constant current discharge, wherein each stage of constant current discharge is provided with discharge time;
E. cycling the multi-stage constant current discharge in the process D until the cut-off voltage;
F. the process A to E is circulated for 10 times;
G. discharging at constant current until the cut-off voltage of the battery module;
H. the process A to G is circulated for 60 times.
4. The method as claimed in claim 3, wherein the process D comprises:
d1: in the first constant current discharge stage, discharging for 1 minute at a current of 1-1.5 ℃;
d2: in the second constant current discharge stage, discharging for 3 minutes at a current of 0.5-0.8 ℃;
d3: in the third constant current discharge stage, discharging for 1 minute at the current of 0.8-1C;
d4: in the fourth constant current discharge stage, discharging for 3 minutes at a current of 0.3-0.5 ℃;
wherein C is the battery rated capacity.
5. The method for testing the working condition of the battery of the electric bicycle according to claim 1, wherein the voltage in the constant-current constant-voltage charging process is the output voltage of a charger; the cutoff voltage of the multi-stage constant current discharge is 10-20% SOC.
6. The method for testing the working condition of the battery of the electric bicycle according to claim 1, wherein the correcting process comprises the following steps:
when T-TTestingWhen the ratio is more than or equal to 700, Y is equal to YTesting*(T-TTesting)；
When 350 < T-TTestingWhen < 700, Y ═ YTesting*(T-TTesting)-3E-3；
Wherein T is long-term service life;
TtestingThe time of actual test;
y is capacity retention for long-term use;
YtestingIs the capacity retention rate actually tested.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111505507A (en) * | 2019-01-31 | 2020-08-07 | 北京新能源汽车股份有限公司 | Battery aging treatment method |
| CN115377536A (en) * | 2022-09-14 | 2022-11-22 | 江苏正力新能电池技术有限公司 | Battery charging and discharging method, battery module, battery pack and power supply device |
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