CN105388426A - Method and apparatus for estimating state of health (SOH) of battery - Google Patents
Method and apparatus for estimating state of health (SOH) of battery Download PDFInfo
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- CN105388426A CN105388426A CN201510920903.6A CN201510920903A CN105388426A CN 105388426 A CN105388426 A CN 105388426A CN 201510920903 A CN201510920903 A CN 201510920903A CN 105388426 A CN105388426 A CN 105388426A
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- internal resistance
- soh
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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]
- G01R31/385—Arrangements for measuring battery or accumulator variables
-
- 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]
- G01R31/374—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC] with means for correcting the measurement for temperature or ageing
-
- 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
-
- 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]
- G01R31/389—Measuring internal impedance, internal conductance or related variables
-
- 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 method and apparatus for estimating the state of health (SOH) of a battery. The method includes the following steps that: the direct current inner resistance of the battery is measured; and the state of health (SOH) of the battery is estimated according to the direct current inner resistance of the battery. With the method and apparatus for estimating the state of health (SOH) of the battery adopted, the real-time estimation of the state of health can be carried out in a running process of a vehicle conveniently, and accurate results can be obtained without performing a charging test on the battery in a laboratory required.
Description
Technical field
The present invention relates to battery detecting field, particularly, relate to a kind of method and apparatus estimating battery health life-span SOH.
Background technology
The great-capacity power battery group that current electric automobile is equipped with all specialized designs has battery management system (BMS), to monitor the state (comprising voltage, electric current, temperature, capacity etc.) of electric battery and monomer and to assess.
The battery health life-span (StateofHealth, SOH), namely accumulator completely filled the number percent of capacity relative rated capacity also known as accumulator capacity, health degree, performance state, and the battery that newly dispatches from the factory is 100%, and scrapping completely is 0%.During charging, when battery terminal voltage reaches the maximum voltage preset, judge that battery is full of electricity.Under normal circumstances, under battery is scrapped and is defined as room ambient conditions, (as 25 DEG C) can be filled with that capacity attenuation is the capacity that dispatches from the factory 80%.Such as, when just dispatching from the factory, the be filled with electricity of battery is 5 ampere-hours (Ah), at this moment SOH is 100%, after using after a while, the be filled with electricity of battery reduces to 4.75 ampere-hours (Ah), then SOH is at this moment 75%, when the be filled with electricity of battery is 4 ampere-hours (Ah), battery is scrapped, and at this moment SOH is 0%.The very important step of BMS system to the estimation of SOH.The specific formula for calculation of SOH can be:
Wherein CAP
nowelectricity is filled with, CAP for current
eolelectricity can be filled with, CAP during for scrapping
initialelectricity can be filled with during for dispatching from the factory.
The real-time estimation of current SOH is estimated to be filled with electricity mainly through the cycle life of battery and calendar life, after estimating the circulation of N primary cell, use the SOH after some moons, but this method estimates that the SOH obtained is not accurate enough, only has reference significance based on data.Method after battery returns factory, carries out charging experiment to battery carry out Measurement accuracy battery SOH comparatively accurately.
Summary of the invention
The object of this invention is to provide a kind of method and apparatus estimating battery health life-span SOH, the method and device without the need to return factory's experiment just can easy, estimate battery SOH in real time, exactly.
According to a first aspect of the invention, provide a kind of method estimating battery health life-span SOH, the method comprises: measure battery DC internal resistance; And according to described battery DC internal resistance, estimate battery SOH.
In some optional embodiments of first aspect, the internal resistance of described measurement battery DC comprises: when vehicle leaves standstill, and applies discharge current to battery; The voltage and current of monitoring battery; And according to the voltage knots modification of battery and the electric current knots modification of correspondence, obtain described battery DC internal resistance.
In some optional embodiments of first aspect, the internal resistance of described measurement battery DC comprises: in vehicle travel process, the voltage and current of Real-Time Monitoring battery; And according to the voltage knots modification of battery and the electric current knots modification of correspondence, obtain described battery DC internal resistance.
In some optional embodiments of first aspect, described according to the voltage knots modification of battery and the electric current of correspondence, obtaining described battery DC internal resistance is: in stabilization time of battery current more than the first preset time t
1afterwards, if electric current changes instantaneously, according to the second preset time t
2within the voltage knots modification of battery and the electric current of correspondence, obtain described battery DC internal resistance.
In some optional embodiments of first aspect, described first preset time t
1be more than or equal to 10s, described second preset time t
2be less than or equal to 5s.
In some optional embodiments of first aspect, the internal resistance of described measurement battery DC is: when battery charge state SOC is in preset range, measures battery DC internal resistance.
In some optional embodiments of first aspect, described preset range is 50%≤SOC≤100%.
In some optional embodiments of first aspect, described according to described battery DC internal resistance, estimate that battery SOH comprises: detect battery temperature; According to described battery temperature, determine the mapping relations corresponding with described battery temperature, wherein, described mapping relations represent the corresponding relation of battery DC internal resistance and battery SOH, or represent the corresponding relation of battery DC internal resistance and battery active volume; When described mapping relations represent the corresponding relation of battery DC internal resistance and battery SOH, by searching described mapping relations, estimate the battery SOH corresponding with described battery DC internal resistance; When described mapping relations represent the corresponding relation of battery DC internal resistance and battery active volume, by searching described mapping relations, estimate the battery active volume corresponding with described battery DC internal resistance, and estimate battery SOH according to described battery active volume.
According to a second aspect of the invention, provide a kind of device estimating battery health life-span SOH, this device comprises: DC internal resistance measurement module, for measuring battery DC internal resistance; And SOH estimation module, for according to described battery DC internal resistance, estimate battery SOH.
In some optional embodiments of second aspect, described DC internal resistance measurement module comprises: discharge current applies submodule, for when vehicle leaves standstill, applies discharge current to battery; First monitoring submodule, for monitoring the voltage and current of battery; And DC internal resistance calculating sub module, for according to the voltage knots modification of battery and the electric current knots modification of correspondence, obtain described battery DC internal resistance.
In some optional embodiments of second aspect, described DC internal resistance measurement module comprises: the second monitoring submodule, in vehicle travel process, and the voltage and current of Real-Time Monitoring battery; And DC internal resistance calculating sub module, for according to the voltage knots modification of battery and the electric current knots modification of correspondence, obtain described battery DC internal resistance.
In some optional embodiments of second aspect, described DC internal resistance calculating sub module is used in stabilization time of battery current more than the first preset time t
1afterwards, if electric current changes instantaneously, according to the second preset time t
2within the voltage knots modification of battery and the electric current knots modification of correspondence, obtain described battery DC internal resistance.
In some optional embodiments of second aspect, described first preset time t
1be more than or equal to 10s, described second preset time t
2be less than or equal to 5s.
In some optional embodiments of second aspect, described DC internal resistance measurement module is used for when battery charge state SOC is in preset range, measures battery DC internal resistance.
In some optional embodiments of second aspect, described preset range is 50%≤SOC≤100%.
In some optional embodiments of second aspect, described SOH estimation module comprises: temperature detection submodule, for detecting battery temperature; Mapping relations determination submodule, for according to described battery temperature, determine the mapping relations corresponding with described battery temperature, wherein, described mapping relations represent the corresponding relation of battery DC internal resistance and battery SOH, or represent the corresponding relation of battery DC internal resistance and battery active volume; One SOH estimator module, for when described mapping relations represent the corresponding relation of battery DC internal resistance and battery SOH, by searching described mapping relations, estimates the battery SOH corresponding with described battery DC internal resistance; 2nd SOH estimator module, for when described mapping relations represent the corresponding relation of battery DC internal resistance and battery active volume, by searching described mapping relations, estimate the battery active volume corresponding with described battery DC internal resistance, and estimate battery SOH according to described battery active volume.
The present invention is based on battery DC internal resistance and carry out estimating battery SOH, make it possible to the real-time estimation (such as, in vehicle travel process) carrying out SOH easily, result comparatively accurately can be obtained without the need to battery is done charge test in laboratory situation.
Other features and advantages of the present invention are described in detail in embodiment part subsequently.
Accompanying drawing explanation
Accompanying drawing is used to provide a further understanding of the present invention, and forms a part for instructions, is used from explanation the present invention, but is not construed as limiting the invention with embodiment one below.In the accompanying drawings:
Fig. 1 is the process flow diagram of the method for estimation battery SOH provided by the invention;
Fig. 2 is the curve map representing battery DC internal resistance and battery charge state SOC, battery temperature corresponding relation;
Fig. 3 is the curve map representing battery DC internal resistance and battery active volume corresponding relation; And
Fig. 4 is the block diagram of the device of estimation battery SOH provided by the invention.
Embodiment
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described in detail.Should be understood that, embodiment described herein, only for instruction and explanation of the present invention, is not limited to the present invention.
As shown in Figure 1, the invention provides a kind of method estimating battery health life-span SOH, the method comprises:
S1, the internal resistance of measurement battery DC; And
S2, the battery DC internal resistance estimation battery SOH recorded according to step S1.
Wherein, battery DC internal resistance is the important technology index weighing battery performance, can measure in several ways, such as direct-current discharge method, ac-current inject method etc.In some optional embodiments, when vehicle (such as, electric motor car, hybrid vehicle etc.) leaves standstill, battery DC internal resistance can be measured in the following manner: discharge current is applied to battery.In battery discharge procedure, the voltage and current of monitoring battery.Afterwards, according to the electric current knots modification of the voltage knots modification of battery and correspondence, battery DC internal resistance can be obtained, such as, battery DC internal resistance R=Δ U/ Δ I, wherein, Δ U is the voltage knots modification of the battery monitored, and Δ I is the electric current knots modification of the battery monitored.By this embodiment, when vehicle leaves standstill, the battery DC internal resistance of vehicle can be measured.
In other optional embodiments, in vehicle travel process, battery DC internal resistance can be measured in the following manner: the voltage and current of Real-Time Monitoring battery; And according to the voltage knots modification of battery and the electric current knots modification of correspondence, obtain described battery DC internal resistance.Like this, in vehicle travel process, can the change of real-time follow-up cell voltage and electric current, the electric current of logical superpotential change and correspondence changes and obtains battery DC internal resistance.
No matter be when vehicle leaves standstill or in vehicle travel process, battery DC internal resistance can be measured under the following conditions: in stabilization time of battery current more than the first preset time t
1afterwards, if electric current changes (such as, within the very short time, electric current sharply changes) instantaneously, according to the second preset time t
2within the voltage knots modification of battery and the electric current knots modification of correspondence, obtain battery DC internal resistance.That is, at battery current after a period of stabilisation, if electric current instantaneous variation, then show that now battery DC internal resistance there occurs change, now, by the second preset time t
2within the voltage knots modification of battery and the electric current knots modification of correspondence obtain battery DC internal resistance, the situation of change of battery DC internal resistance can be understood in time and exactly, thus estimate current battery SOH in time, exactly.Wherein, the first preset time t
1with the second preset time t
2can select according to actual needs, preferably, the first preset time t
1be more than or equal to 10s, the second preset time t
2be less than or equal to 5s.
Fig. 2 shows the curve that battery represents battery DC internal resistance and battery charge state SOC, battery temperature corresponding relation.As shown in Figure 2, battery DC internal resistance is relevant with battery SOC and battery temperature.When battery temperature one timing, battery SOC is larger, and battery DC internal resistance is less.Further, when battery temperature is certain, when battery SOC is in higher range, the change of battery DC internal resistance can be smoother, and when battery SOC is in lower scope, battery DC internal resistance can sharply change.Therefore, preferably, in step sl, when battery charge state SOC is in a preset range, battery DC internal resistance is measured.Wherein, as shown in Figure 2, this preset range can be 50%≤SOC≤100%, because when battery SOC meets above-mentioned condition, battery DC internal resistance changes relatively mild, and the battery DC internal resistance value now recorded is comparatively accurate.
After measuring battery DC internal resistance, battery SOH can be estimated according to this battery DC internal resistance.Corresponding relation between battery DC internal resistance and battery SOH, by the impact of battery temperature, under different battery temperatures, has different corresponding relations between battery DC internal resistance from battery SOH.For this reason, in an optional embodiment, battery SOH can be estimated in the following manner: first, detect battery temperature.Afterwards, according to detecting the battery temperature obtained, the mapping relations corresponding with this battery temperature can be determined, wherein, these mapping relations can represent the corresponding relation of battery DC internal resistance and battery SOH, and such as, these mapping relations can be the forms such as equation, curve, look-up table.Further, these mapping relations under often kind of battery temperature can be obtained by lot of experimental data, such as, carry out repeatedly discharge and recharge test to battery and obtain.Like this, by searching this mapping relations, the battery SOH corresponding with battery DC internal resistance can be estimated.
In use, DC internal resistance can become increasing to battery.When just dispatching from the factory, battery DC internal resistance is such as 4 milliohms, and when scrapping, battery DC internal resistance is 8 milliohms, and in use procedure, battery DC internal resistance can constantly increase to 8 milliohms from 4 milliohms.During charging, the internal resistance of battery also can divide a part of voltage, makes battery more easily reach the charging voltage on border, also just makes the capacity that can be filled with reduce.Based on the principle of above battery DC internal resistance change, between battery DC internal resistance and battery active volume, there is certain corresponding relation, and, under different battery temperatures, between battery DC internal resistance from battery active volume, there is different corresponding relations.Therefore, in another optional embodiment of the present invention, can after battery temperature being detected, according to detecting the battery temperature obtained, determine the mapping relations corresponding with this battery temperature, wherein, these mapping relations can represent the corresponding relation of battery DC internal resistance and battery active volume, such as, these mapping relations can be the forms such as equation, curve, look-up table.Further, these mapping relations under often kind of battery temperature can be obtained by lot of experimental data, such as, carry out repeatedly discharge and recharge test to battery and obtain.Like this, by searching this mapping relations, the battery active volume corresponding with described battery DC internal resistance first can be estimated.Such as, Fig. 3 shows the curve representing battery DC internal resistance and battery active volume corresponding relation.When estimating battery SOH, according to the battery DC internal resistance of measuring, searching curve as shown in Figure 3, obtaining battery active volume.Afterwards, battery SOH is estimated according to battery active volume.Estimate that battery SOH can pass through following formulae discovery according to battery active volume:
Wherein CAP
nowelectricity is filled with, that is, the above-mentioned battery active volume estimated, CAP for current
eolelectricity can be filled with, CAP during for scrapping
initialelectricity can be filled with during for dispatching from the factory.
As shown in Figure 4, present invention also offers a kind of device 300 estimating battery health life-span SOH, this device 300 can comprise: DC internal resistance measurement module 310, for measuring battery DC internal resistance; And SOH estimation module 320, for according to the battery DC internal resistance recorded, estimate battery SOH.
Alternatively, described DC internal resistance measurement module 310 can comprise: discharge current applies submodule, for when vehicle leaves standstill, applies discharge current to battery; First monitoring submodule, for monitoring the voltage and current of battery; And DC internal resistance calculating sub module, for according to the voltage knots modification of battery and the electric current knots modification of correspondence, obtain described battery DC internal resistance.
Alternatively, described DC internal resistance measurement module 310 can comprise: the second monitoring submodule, in vehicle travel process, and the voltage and current of Real-Time Monitoring battery; And DC internal resistance calculating sub module, for according to the voltage knots modification of battery and the electric current knots modification of correspondence, obtain described battery DC internal resistance.
Alternatively, described DC internal resistance calculating sub module in the stabilization time of battery current more than the first preset time t
1afterwards, if electric current changes instantaneously, according to the second preset time t
2within the voltage knots modification of battery and the electric current knots modification of correspondence, obtain battery DC internal resistance.Preferably, the first preset time t
1be more than or equal to 10s, the second preset time t
2be less than or equal to 5s.
When battery SOC is in certain limit, the change of battery DC internal resistance is smoother, and the internal resistance value obtained like this is more accurate.Therefore, preferably, described DC internal resistance measurement module 310 when battery charge state SOC is in preset range, can measure battery DC internal resistance.Wherein, described preset range can be 50%≤SOC≤100%.When battery SOC meets above-mentioned condition, the battery DC internal resistance value recorded is comparatively accurate.
In addition, described SOH estimation module 320 can comprise: temperature detection submodule, for detecting battery temperature; Mapping relations determination submodule, for according to described battery temperature, determine the mapping relations corresponding with described battery temperature, wherein, described mapping relations represent the corresponding relation of battery DC internal resistance and battery SOH, or represent the corresponding relation of battery DC internal resistance and battery active volume; One SOH estimator module, for when described mapping relations represent the corresponding relation of battery DC internal resistance and battery SOH, by searching described mapping relations, estimates the battery SOH corresponding with described battery DC internal resistance; 2nd SOH estimator module, for when described mapping relations represent the corresponding relation of battery DC internal resistance and battery active volume, by searching described mapping relations, estimate the battery active volume corresponding with described battery DC internal resistance, and estimate battery SOH according to described battery active volume.
The method and apparatus of estimation battery SOH provided by the invention, battery SOH is estimated by the battery DC internal resistance of measuring, just can estimate battery SOH (such as, in vehicle travel process) without the need to carrying out returning factory's experiment, have easy, in real time, advantage accurately.
Below the preferred embodiment of the present invention is described in detail by reference to the accompanying drawings; but; the present invention is not limited to the detail in above-mentioned embodiment; within the scope of technical conceive of the present invention; can carry out multiple simple variant to technical scheme of the present invention, these simple variant all belong to protection scope of the present invention.
It should be noted that in addition, each concrete technical characteristic described in above-mentioned embodiment, in reconcilable situation, can be combined by any suitable mode, in order to avoid unnecessary repetition, the present invention illustrates no longer separately to various possible array mode.
In addition, also can carry out combination in any between various different embodiment of the present invention, as long as it is without prejudice to thought of the present invention, it should be considered as content disclosed in this invention equally.
Claims (14)
1. estimate a method of battery health life-span SOH, it is characterized in that, the method comprises:
Measure battery DC internal resistance; And
According to described battery DC internal resistance, estimate battery SOH.
2. method according to claim 1, is characterized in that, the internal resistance of described measurement battery DC comprises:
When vehicle leaves standstill, discharge current is applied to battery;
The voltage and current of monitoring battery; And
According to the voltage knots modification of battery and the electric current knots modification of correspondence, obtain described battery DC internal resistance.
3. method according to claim 1, is characterized in that, the internal resistance of described measurement battery DC comprises:
In vehicle travel process, the voltage and current of Real-Time Monitoring battery; And
According to the voltage knots modification of battery and the electric current knots modification of correspondence, obtain described battery DC internal resistance.
4. according to the method in claim 2 or 3, it is characterized in that, described according to the voltage knots modification of battery and the electric current knots modification of correspondence, obtaining described battery DC internal resistance is:
In stabilization time of battery current more than the first preset time t
1afterwards, if electric current changes instantaneously, according to the second preset time t
2within the voltage knots modification of battery and the electric current knots modification of correspondence, obtain described battery DC internal resistance.
5. method according to claim 4, is characterized in that, described first preset time t
1be more than or equal to 10s, described second preset time t
2be less than or equal to 5s.
6. the method according to claim arbitrary in claim 1-3, is characterized in that, the internal resistance of described measurement battery DC is:
When battery charge state SOC is in preset range, measure battery DC internal resistance.
7. method according to claim 6, is characterized in that, described preset range is 50%≤SOC≤100%.
8. the method according to claim arbitrary in claim 1-3, is characterized in that, described according to described battery DC internal resistance, estimates that battery SOH comprises:
Detect battery temperature;
According to described battery temperature, determine the mapping relations corresponding with described battery temperature, wherein, described mapping relations represent the corresponding relation of battery DC internal resistance and battery SOH, or represent the corresponding relation of battery DC internal resistance and battery active volume;
When described mapping relations represent the corresponding relation of battery DC internal resistance and battery SOH, by searching described mapping relations, estimate the battery SOH corresponding with described battery DC internal resistance;
When described mapping relations represent the corresponding relation of battery DC internal resistance and battery active volume, by searching described mapping relations, estimate the battery active volume corresponding with described battery DC internal resistance, and estimate battery SOH according to described battery active volume.
9. estimate a device of battery health life-span SOH, it is characterized in that, this device comprises:
DC internal resistance measurement module, for measuring battery DC internal resistance; And
SOH estimation module, for according to described battery DC internal resistance, estimates battery SOH.
10. device according to claim 9, is characterized in that, described DC internal resistance measurement module comprises:
Discharge current applies submodule, for when vehicle leaves standstill, applies discharge current to battery;
First monitoring submodule, for monitoring the voltage and current of battery; And
DC internal resistance calculating sub module, for according to the voltage knots modification of battery and the electric current knots modification of correspondence, obtains described battery DC internal resistance.
11. devices according to claim 9, is characterized in that, described DC internal resistance measurement module comprises:
Second monitoring submodule, in vehicle travel process, the voltage and current of Real-Time Monitoring battery; And
DC internal resistance calculating sub module, for according to the voltage knots modification of battery and the electric current knots modification of correspondence, obtains described battery DC internal resistance.
12. devices according to claim 10 or 11, is characterized in that, described DC internal resistance calculating sub module is used for stabilization time at battery current more than the first preset time t
1afterwards, if electric current changes instantaneously, according to the second preset time t
2within the voltage knots modification of battery and the electric current knots modification of correspondence, obtain described battery DC internal resistance.
13. devices according to claim arbitrary in claim 9-11, it is characterized in that, described DC internal resistance measurement module is used for when battery charge state SOC is in preset range, measures battery DC internal resistance, wherein, described preset range is 50%≤SOC≤100%.
14. devices according to claim arbitrary in claim 9-11, it is characterized in that, described SOH estimation module comprises:
Temperature detection submodule, for detecting battery temperature;
Mapping relations determination submodule, for according to described battery temperature, determine the mapping relations corresponding with described battery temperature, wherein, described mapping relations represent the corresponding relation of battery DC internal resistance and battery SOH, or represent the corresponding relation of battery DC internal resistance and battery active volume;
One SOH estimator module, for when described mapping relations represent the corresponding relation of battery DC internal resistance and battery SOH, by searching described mapping relations, estimates the battery SOH corresponding with described battery DC internal resistance;
2nd SOH estimator module, for when described mapping relations represent the corresponding relation of battery DC internal resistance and battery active volume, by searching described mapping relations, estimate the battery active volume corresponding with described battery DC internal resistance, and estimate battery SOH according to described battery active volume.
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| CN106291380A (en) * | 2016-08-16 | 2017-01-04 | 苏州协鑫集成科技工业应用研究院有限公司 | The appraisal procedure of cell degradation and device |
| CN106970334A (en) * | 2017-05-05 | 2017-07-21 | 安徽锐能科技有限公司 | The method and device of cell health state detection |
| CN107064815A (en) * | 2017-03-31 | 2017-08-18 | 惠州市蓝微新源技术有限公司 | A kind of internal resistance of cell computational methods |
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| CN112557909A (en) * | 2020-12-17 | 2021-03-26 | 四川虹微技术有限公司 | Lithium battery service life detection system and method based on internal resistance |
| CN112748350A (en) * | 2019-10-29 | 2021-05-04 | 南京德朔实业有限公司 | Battery pack fault judgment method, fault detection system and battery pack |
| CN113156324A (en) * | 2021-03-03 | 2021-07-23 | 同济大学 | Electric vehicle battery pack end-of-life diagnosis method combined with charging pile |
| CN114114025A (en) * | 2021-09-30 | 2022-03-01 | 岚图汽车科技有限公司 | Power battery health state detection method and related equipment |
| EP4160234A4 (en) * | 2021-08-11 | 2023-05-03 | Contemporary Amperex Technology Co., Limited | Charging current testing method and apparatus, and charging testing system |
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