WO2018126901A1 - Method and device for testing health status of battery - Google Patents
Method and device for testing health status of battery Download PDFInfo
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- WO2018126901A1 WO2018126901A1 PCT/CN2017/117672 CN2017117672W WO2018126901A1 WO 2018126901 A1 WO2018126901 A1 WO 2018126901A1 CN 2017117672 W CN2017117672 W CN 2017117672W WO 2018126901 A1 WO2018126901 A1 WO 2018126901A1
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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]
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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]
- G01R31/3644—Constructional arrangements
- G01R31/3648—Constructional arrangements comprising digital calculation means, e.g. for performing an algorithm
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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
Definitions
- Embodiments of the present invention relate to, but are not limited to, the field of battery testing, and in particular, to a battery health state detecting method and apparatus.
- the degree of battery aging also known as State of Health (SOH) refers to the ratio of the amount of electricity discharged by a fully charged battery to the nominal amount of electricity, representing the ability of the battery to store electricity. As the battery is used and aged, SOH will gradually decrease. It is clearly stated in IEEE Standard 1188-1996 that the battery needs to be replaced when the capacity of the battery drops to 80%, that is, when the SOH value is less than 0.8.
- the degree of battery aging is typically estimated by detecting changes in internal resistance, or by full discharge.
- the battery aging and the internal resistance of the battery have a direct relationship, but the internal resistance of the battery is very small, and has a great relationship with the current power, temperature and charge and discharge conditions, which will cause the detection of internal resistance is very difficult. It is only possible to estimate a relatively accurate internal resistance if the environment is stable. Therefore, based on the accuracy of the measurement results, the full discharge method is generally used for measurement. However, the full discharge method can only be tested offline and requires a long test time.
- the embodiment of the invention provides a battery health state detecting method and device for realizing online detection of battery health.
- An embodiment of the present invention provides a battery health state detecting method, including:
- the step of separately calculating a capacity difference value and a voltage difference value according to the two collected voltage values and capacity values including:
- the capacity difference is calculated according to the voltage value and the capacity value collected at the nth and the first time respectively. And the voltage difference; wherein the acquisition is performed every time the battery health state detection is performed, and n is a natural number greater than 1.
- the battery health state detecting method before the step of collecting the voltage value and the capacity value of the battery to be tested, the battery health state detecting method further includes:
- the manner of presetting the correspondence between the ratio and the aging coefficient includes:
- the aging curve is a curve corresponding to the aging coefficient of the charge change cycle accumulated value
- the step of obtaining a typical aging curve according to the aging test comprises:
- a typical aging curve is determined according to the typical aging coefficients corresponding to the respective cumulative values of the respective power change cycles.
- the battery health state detecting method before the step of collecting the voltage value and the capacity value of the battery to be tested, the battery health state detecting method further includes:
- the step of obtaining an aging coefficient corresponding to the determined ratio according to the preset relationship between the ratio and the aging coefficient including:
- the determining, according to the collected electric quantity value, the step of calculating the current electric quantity change cycle of the battery to be tested includes:
- the determined power change cycle cumulative value is determined as the current power change cycle tired.
- Embodiments of the present invention provide a computer readable storage medium storing computer executable instructions, which are implemented by a processor to implement the battery health state detecting method described above.
- Embodiments of the present invention provide a battery health state detecting apparatus, including:
- the sampling module is configured to collect the voltage value and the capacity value of the battery to be tested at the same time
- the parameter calculation module is configured to calculate the capacity difference and the voltage difference respectively according to the two collected voltage values and capacity values;
- a slope determining module configured to determine a ratio of the capacity difference value to the voltage difference value
- the aging determination module is configured to acquire and match according to a preset ratio of the ratio and the aging coefficient The aging factor corresponding to the determined ratio.
- the parameter calculation module is configured to set the difference between the voltage value acquired in the nth time and the voltage value collected in the first time to reach the preset pressure difference threshold, according to the nth and the first The collected voltage value and the capacity value respectively calculate the capacity difference value and the voltage difference value; wherein each time the battery health state detection is performed, the acquisition is the first acquisition, and n is a natural number greater than 1.
- the sampling module is configured to stop collecting the simultaneously recorded voltage value and capacity value when the battery to be tested is in a charging state, and discard the collected voltage value and capacity value;
- the apparatus further includes a cyclic accumulation module, the cyclic accumulation module comprising:
- a typical curve acquisition module is configured to obtain a typical aging curve according to the aging test;
- the aging curve is a curve corresponding to a aging coefficient of a charge change cycle cumulative value;
- a slope detecting module configured to determine, according to the aging curve, a slope corresponding to each of the charge change cycle accumulated values, wherein the slope is a ratio of the capacity difference value to the voltage difference value;
- a setting module configured to set a correspondence between the ratio and the aging coefficient according to the slope and the aging curve.
- the typical curve acquisition module is configured to record each power change cycle cumulative value of each battery and corresponding corresponding aging coefficient information
- a typical aging curve is determined according to the typical aging coefficients corresponding to the respective cumulative values of the respective power change cycles.
- the sampling module is further configured to periodically collect the power value of the battery to be tested
- the aging determination module is configured to: determine, according to the collected electric quantity value, a current electric quantity change cycle of the battery to be tested; and obtain an aging coefficient range corresponding to a current accumulated electric energy change cycle cumulative value of the battery to be tested; The corresponding relationship between the ratio and the aging coefficient is obtained within the range of the aging coefficient corresponding to the current accumulated value of the electric quantity change cycle, and the aging coefficient corresponding to the determined ratio is obtained.
- the aging determination module is configured to load a corresponding power change cycle cumulative value when the aging coefficient range of the battery to be tested is acquired last time;
- the determined power change cycle cumulative value is determined as the current power change cycle tired.
- the method and the device provided by the embodiments of the present invention determine the ratio of the capacity difference and the voltage difference; according to the correspondence between the preset ratio and the aging coefficient, obtain an aging coefficient corresponding to the determined ratio, thereby realizing the battery health degree online. Detection, and relative to the full discharge method, effectively reduces the detection time.
- FIG. 1 is a flowchart of a battery health state detecting method according to an embodiment of the present invention
- FIG. 2 is a schematic diagram showing a series of N soc and ⁇ corresponding to an embodiment of the present invention
- FIG. 3 is a schematic view showing curves ⁇ , ⁇ , and ⁇ of different ages after the same battery undergoes different charge and discharge cycles in the embodiment of the present invention
- FIG. 5 is a schematic diagram showing an aging curve after 1000 cycles of charge and discharge in a new state of the same battery in the embodiment of the present invention.
- FIG. 6 is a specific flowchart of a loop accumulation method in an embodiment of the present invention.
- FIG. 8 is a schematic structural diagram of a battery health state detecting apparatus according to an embodiment of the present invention.
- the embodiments of the present invention provide a method and an apparatus for detecting a health state of a battery.
- the embodiments of the present invention are further described in detail below with reference to the accompanying drawings and embodiments.
- a first embodiment of the present invention provides a battery health state detecting method, including steps S101 to S104.
- Step S101 continuously collecting the voltage value and the capacity value of the battery to be tested at the same time according to the set sampling period; wherein the size of the sampling period can be set according to actual conditions.
- Step S102 calculating a capacity difference value and a voltage difference value according to the two collected voltage values and capacity values.
- Step S103 determining a ratio of the capacity difference value to the voltage difference value.
- Step S104 Acquire an aging coefficient corresponding to the determined ratio according to a correspondence between the preset ratio and the aging coefficient.
- the ratio of the capacity difference to the voltage difference is determined; according to the correspondence between the preset ratio and the aging coefficient, an aging coefficient corresponding to the determined ratio is obtained, thereby realizing online detection of battery health.
- the full discharge method is generally used for measurement.
- the full discharge method can only be tested offline, and requires a long test time.
- the embodiment of the invention effectively reduces the detection time and realizes real-time online detection.
- the embodiment of the present invention pre-tests a series of battery voltage-availability (V bat -Capacity) data when the recorded point of N soc - ⁇ is obtained; then the slope is determined by the measured ⁇ V- ⁇ C slope.
- the pre-tested voltage-availability (V bat -Capacity) data is used as a benchmark, and the recording point of N soc - ⁇ closest to the slope can be obtained, thereby obtaining a corresponding aging coefficient.
- N soc refers to the cumulative value of the power change cycle
- ⁇ is the battery aging coefficient
- ⁇ V is the voltage difference
- ⁇ C is the capacitance difference.
- the correspondence between the ratio and the aging coefficient is preset according to the ⁇ V- ⁇ C slope method. That is to say, the manner in which the preset ratio and the aging coefficient correspond to each other includes:
- the aging curve reflects the relationship between the accumulated value of the power change cycle and the aging coefficient; that is, the aging curve is specifically the cumulative value of each power change cycle and the power change cycle.
- the curve of the aging coefficient corresponding to the accumulated value.
- the embodiment of the present invention performs an aging test on the battery according to the method of accumulating the amount of the electric quantity, that is, the step of obtaining a typical aging curve according to the aging test, including:
- Stepping according to the set accumulated value change recording the cumulative value of each power change cycle of each battery and the corresponding aging coefficient information
- a typical aging curve is determined based on the typical aging coefficient values corresponding to each of the same charge change cycle accumulated values.
- the method before the step of collecting the voltage value and the capacity value of the battery to be tested at the same time, the method further includes:
- the steps of the aging factor include:
- the determining, according to the collected electric quantity value, the step of calculating the current electric quantity change cycle of the battery to be tested includes:
- the cumulative value of the electric quantity change cycle is determined; specifically, when the collected electric quantity value reaches the set accumulating threshold value, the accumulated value of the electric quantity change cycle is incremented by one.
- the determined power change cycle cumulative value is determined as the current power change cycle tired.
- N soc refers to the cumulative value of the charge change cycle, where N soc is incremented by 1% for each change in charge; a is the ratio of aging for every 1% change in charge.
- the N soc value is 0. After the factory starts to accumulate, it is assumed that the factory power is 50%, the user continuously uses 10%, the value is 40; if the user charges to 100%, the value is added to 140 (ie 100+40).
- a series of N soc - ⁇ coordinates can be obtained. Since the aging speed is not linear, the aging under different accumulated amounts is calculated according to the charge and discharge SOC accumulation amount. That is, the accumulated aging coefficient is continuously updated according to the accumulated amount. At the same time, a batch of batteries (set number) is used for the aging test, and the obtained aging coefficient is high or low. According to the change of the charge and discharge SOC accumulation amount, a series of aging coefficient ranges [ ⁇ low , ⁇ high ] are recorded. At the same time, a typical discharge curve is also found to calculate the specific aging coefficient, so that the aging coefficient range of the battery and the typical aging value can be obtained by the cyclic accumulation method. This will prepare you for the accurate calculation of SOH in the next step.
- the intermediate value of the aging coefficient range [ ⁇ low , ⁇ high ] is taken as a typical aging coefficient, or the coefficient in the interval which is close to the user's charge electric law is taken as a typical aging coefficient.
- the aging interval of 0.6 to 0.65 as shown in FIG. 2 by calculating the intermediate value of 0.625, can find a typical curve corresponding to the current N soc and the aging coefficient of 0.625, and even the aging value.
- the typical aging coefficient is discarded, and in the aging interval, the specific value of the corresponding aging coefficient on the typical aging curve is found according to the slope method. It is worth noting that this value must also be within the aging range and may be the same as the typical aging factor.
- a more accurate aging range of SOH can be obtained.
- the exact value is further confirmed based on the ⁇ V- ⁇ C slope method. That is to say, using a series of battery voltage-available capacity V bat -Capacity data at a series of N soc - ⁇ recording points of the typical curve above, the measured ⁇ V- ⁇ C slope is measured and calculated by the cyclic accumulation method.
- the V bat -Capacity data of the typical curve in the aging range is benchmarked, and the closest N soc - ⁇ recording point can be obtained, then the aging coefficient ⁇ coefficient is the calculated aging coefficient.
- the capacity that the battery can release is also different. As shown in Fig. 3, the same battery has different battery aging curves ⁇ , ⁇ , ⁇ after different charging and discharging cycles.
- the capacity corresponding to different voltage values is also different.
- the capacity change value can be detected by using a coulomb counter or other BMS (Battery Monitor System) technology.
- BMS Battery Monitor System
- the cyclic accumulation method can obtain the SOH range, on the basis of which a more specific and accurate SOH value can be calculated from the difference in slope.
- the step of separately calculating a capacity difference value and a voltage difference value according to the two collected voltage values and capacity values including:
- the capacity difference is calculated according to the voltage value and the capacity value collected at the nth and the first time respectively. And the voltage difference; wherein n is a natural number greater than 1, and the acquisition performed when performing battery health detection is the first acquisition.
- Embodiments of the present invention increase the detection accuracy of the embodiments of the present invention.
- the method before the step of collecting the voltage value and the capacity value of the battery to be tested, the method further includes:
- Step S401 connecting a charging device to perform charging
- Step S402 stopping the ⁇ V- ⁇ C slope method calculation process, and discarding the data in the calculation process;
- Step S403 disconnecting the charging device and stopping charging
- step S404 the recalculation process is started.
- the process of aging detection and ⁇ V- ⁇ C slope calculation is performed in advance: the aging coefficient range [ ⁇ low , ⁇ is calculated after 1000 charge and discharge cycles in several new states of the same battery in this example.
- High ] is [0.6, 0.7], that is, the aging coefficient is between 0.6 and 0.7, including 0.6 and 0.7, and the typical value is 0.65.
- the aging coefficient after different charge and discharge cycles can be obtained, so that the range of aging coefficients corresponding to the cumulative value of the charge change cycle can be obtained. value.
- the cyclic accumulation method of specific aging detection includes:
- Step S601 the battery monitoring system BMS provides the power change information, and the variation range is generally 1%;
- step S602 when the power is changed, the process jumps to S603. Otherwise, the process goes to step S604.
- Step S603 based on step S602, the power accumulation value N soc is correspondingly increased, and the timer is reset.
- Step S604 when the timer is triggered, the power is automatically queried, then the timer is reset, and the timer is continued.
- the timer is set to 10 minutes;
- Step S605 when a new battery accumulated value of the last N soc SOH value calculated using the amount accumulated value N soc increased when compared to a predetermined value, for example 100 mAh, aging coefficient calculation starts;
- Step S606 loading the accumulated value of the power used in the last calculation of the SOH value, and querying the required data from the basic data of the power aging;
- Step S607 calculation of the SOH (ie, ⁇ ) value interval.
- N soc and the battery aging coefficient and the electric energy accumulating value data N soc - ⁇ low table, N soc - ⁇ high table, and N soc - typical ⁇ table stored in advance we can look up the table to obtain [ ⁇ Low , ⁇ high ] and typical ⁇ .
- the electric charge accumulated value N soc is 200100, that is, the number of charge and discharge cycles is 1000.5 times. Since the electric charge accumulating value N soc - ⁇ table in this example only stores the battery aging coefficient under the integer number of charge and discharge times, the N soc is obtained by looking up the table at 1000 and 1001 times, and we select the number of charge and discharge cycles.
- the low value, ie [ ⁇ low , ⁇ high ] is [0.6, 0.7], and the typical aging coefficient is 0.65.
- Step S608 the new aging coefficient range and the typical aging coefficient and the last calculated value If the ratio is less than the last value, it is valid, skip to step S610; if it is greater than the last value, it is invalid, skip to step S609;
- Step S609 if the calculated value is invalid, the electric quantity accumulated value N soc is updated and stored, and the aging coefficient range and the typical aging coefficient are not updated;
- step S610 the electric quantity accumulated value N soc is updated and stored, and the aging coefficient range and the typical aging coefficient are updated and stored.
- the ⁇ V- ⁇ C slope method for specific aging detection includes:
- the battery aging SOH interval value obtained based on the cyclic accumulation method is calculated according to the capacity change of the battery from 4.1V to 3.6V, and the slope table of the target storage is obtained to obtain the final battery aging coefficient, as shown in FIG. 7, including:
- the battery monitoring system BMS can provide battery data such as battery voltage and real-time capacity.
- step S702 after the battery is in the sleep state for a period of time (for example, ten minutes), the battery voltage tends to be stable. After the voltage has stabilized, the sampling voltage is started and recorded.
- the sampled battery voltage is 4.1V;
- Step S703 based on step S702, simultaneously recording the available capacity value of the battery while sampling the voltage.
- the available usable capacity value is 1500 mAh.
- Step S704 as in step S702, after the battery voltage tends to be stable, the voltage is sampled, if compared with the voltage obtained in step S702. In this example, after 50 minutes of use and 10 minutes of dormancy, a new battery voltage of 3.6V was obtained.
- Step S705 based on step S704, if the pressure difference is greater than 0.4V, the process goes to step S706, otherwise the process goes to step S704 to continue the detection.
- the differential pressure reached (4.1-3.6) V, or 0.5 V, compounding requirements.
- Step S706 based on step S705, obtaining an available capacity value of 500 mAh, and the two sampling available capacity change amount is (1500-500) mAh, that is, 1000 mAh.
- Step S707 based on the previous steps, calculate the ⁇ V- ⁇ C slope k:
- step S708 a plurality of slope values corresponding to the same voltage change in the range can be calculated from the voltage-capacity table of different typical degrees of aging and the range of the battery aging coefficient calculated by the cyclic accumulation method.
- the battery aging factor range is [0.6, 0.7].
- Table 1 there are several voltage-capacity tables with typical curves with different degrees of aging, as shown in Table 1:
- Step S709 in this example, the battery aging coefficient interval range is [0.6, 0.7]. This interval is obtained by the cyclic accumulation method
- step S710 in step S707, the slope k is obtained by the ⁇ V- ⁇ C slope method.
- the aging coefficient corresponding to the calibration curve is 0.65;
- Step S711 based on step S710, the SOH aging coefficient obtained is 0.65;
- step S712 the currently stored SOH value is obtained. If the newly calculated SOH value is less than the value, it is determined to be valid, and the process goes to step S714. If it is invalid, skip to step S713, and the SOH value currently stored in this example is also 0.65, so skip to S714;
- Step S713 if the new SOH value is invalid, the current calculation is ended;
- Step S714 updating the aging coefficient and storing
- step S715 the calculation is completed.
- Embodiments of the present invention provide a computer readable storage medium storing computer executable instructions, which are implemented by a processor to implement the battery health state detecting method described above. Based on the battery health state detecting method of the above embodiments, the embodiment of the present invention further provides a battery health state detecting device.
- a battery health state detecting apparatus includes:
- the sampling module 810 is configured to collect the voltage value and the capacity value of the battery to be tested at the same time
- the parameter calculation module 811 is configured to calculate a capacity difference value and a voltage difference value respectively according to the two collected voltage values and capacity values;
- a slope determination module 812 configured to determine a ratio of the capacity difference value to the voltage difference value
- the aging determination module 813 is configured to obtain an aging coefficient corresponding to the determined ratio according to a correspondence between the preset ratio and the aging coefficient.
- the ratio of the capacity difference to the voltage difference is determined; according to the correspondence between the preset ratio and the aging coefficient, an aging coefficient corresponding to the determined ratio is obtained, thereby realizing online detection of battery health.
- the full discharge method is generally used for measurement.
- the full discharge method can only be tested offline, and requires a long test time.
- the embodiment of the present invention effectively reduces the detection time and realizes real-time online detection.
- the parameter calculation module 811 is configured to: when the difference between the voltage value acquired in the nth time and the voltage value collected in the first time reaches a preset pressure difference threshold, according to the nth The voltage value and the capacity value collected in the first and the first time respectively calculate the capacity difference value and the voltage difference value; wherein the acquisition is performed for each time the battery health state detection is performed, and n is a natural number greater than 1. .
- the sampling module is configured to stop collecting the simultaneously recorded voltage value and capacity value when the battery to be tested is in a charging state, and discard the collected voltage value and capacity value.
- the apparatus further includes a cyclic accumulation module, and the cyclic accumulation module includes:
- the typical curve acquisition module is configured to: obtain a typical aging curve according to the aging test; the aging curve is a curve corresponding to the aging coefficient of the power change cycle cumulative value;
- a slope detecting module configured to determine, according to the aging curve, a slope corresponding to each of the charge change cycle accumulated values, wherein the slope is a ratio of the capacity difference value to the voltage difference value;
- a setting module configured to set a correspondence between the ratio and the aging coefficient according to the slope and the aging curve.
- the typical curve acquisition module is configured to record each power change cycle cumulative value of each battery and corresponding corresponding aging coefficient information
- a typical aging curve is determined according to the typical aging coefficients corresponding to the respective cumulative values of the respective power change cycles.
- the sampling module is further configured to periodically collect the power value of the battery to be tested
- the aging determination module is configured to: determine, according to the collected electric quantity value, a current electric quantity change cycle of the battery to be tested; and obtain an aging coefficient range corresponding to a current accumulated electric energy change cycle cumulative value of the battery to be tested; The corresponding relationship between the ratio and the aging coefficient is obtained within the range of the aging coefficient corresponding to the current accumulated value of the electric quantity change cycle, and the aging coefficient corresponding to the determined ratio is obtained.
- the aging determination module is configured to: load a corresponding power change cycle cumulative value when the aging coefficient range of the battery to be tested is acquired last time;
- the determined power change cycle cumulative value is determined as the current power change cycle tired.
- computer storage medium includes volatile and nonvolatile, implemented in any method or technology for storing information, such as computer readable instructions, data structures, program modules or other data. Sex, removable and non-removable media.
- Computer storage media include, but are not limited to, Random Access Memory (RAM), Read-Only Memory (ROM), and Electrically Erasable Programmable Read-only Memory (EEPROM). Flash memory or other memory technology, compact disc read-only memory (CD-ROM), digital versatile disc (DVD) or other optical disc storage, magnetic cassette, magnetic tape, disk storage or other magnetic storage device, or Any other medium used to store the desired information and that can be accessed by the computer.
- communication media typically includes computer readable instructions, data structures, program modules, or other data in a modulated data signal, such as a carrier wave or other transport mechanism, and can include any information delivery media. .
- the embodiment of the invention provides a battery health state detecting method and device, which realizes online detection of battery health and effectively reduces the detection time.
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Abstract
A method and device for testing the health status of a battery. The method for testing the health status of a battery comprises: according to a set sampling period, continuously measuring voltage values and capacity values at the same moments of a battery to be tested (S101); calculating the capacity difference and voltage difference respectively according to the voltage values and capacity values measured twice (S102); determining the ratio of the capacity difference to the voltage difference (S103); and obtaining an aging coefficient corresponding to the determined ratio according to preset correspondences between ratios and aging coefficients (S104).
Description
本发明实施例涉及但不限于电池检测领域,特别是一种电池健康状态检测方法及装置。Embodiments of the present invention relate to, but are not limited to, the field of battery testing, and in particular, to a battery health state detecting method and apparatus.
电池老化程度又称电池健康状态(SOH,State of Health),指的是一个充满电的电池放出的电量与标称电量的比值,代表电池储存电量的能力。随着电池的使用和老化,SOH会逐渐降低,在IEEE标准1188-1996中有明确规定,当电池的容量下降到80%时,即SOH值小于0.8时电池需要更换。The degree of battery aging, also known as State of Health (SOH), refers to the ratio of the amount of electricity discharged by a fully charged battery to the nominal amount of electricity, representing the ability of the battery to store electricity. As the battery is used and aged, SOH will gradually decrease. It is clearly stated in IEEE Standard 1188-1996 that the battery needs to be replaced when the capacity of the battery drops to 80%, that is, when the SOH value is less than 0.8.
发明内容Summary of the invention
以下是对本文详细描述的主题的概述。本概述并非是为了限制权利要求的保护范围。The following is an overview of the topics detailed in this document. This Summary is not intended to limit the scope of the claims.
对电池SOH测量一般通过检测内阻的变化来估算电池老化程度,或者通过完全放电法进行测量。For battery SOH measurements, the degree of battery aging is typically estimated by detecting changes in internal resistance, or by full discharge.
通常电池老化和电池内阻的变化有着直接的关系,但电池内阻是很小的,并且与当前电量、温度以及充放电情况都有很大关系,这样会导致内阻的检测是十分困难的,只有保证各种环境很稳定的情况下才可能估算到相对准确的内阻。因此,基于测量结果准确性的考虑,目前一般采用完全放电法进行测量。但是,完全放电法只能离线测试,并且需要很长的测试时间。Usually, the battery aging and the internal resistance of the battery have a direct relationship, but the internal resistance of the battery is very small, and has a great relationship with the current power, temperature and charge and discharge conditions, which will cause the detection of internal resistance is very difficult. It is only possible to estimate a relatively accurate internal resistance if the environment is stable. Therefore, based on the accuracy of the measurement results, the full discharge method is generally used for measurement. However, the full discharge method can only be tested offline and requires a long test time.
本发明实施例提供了一种电池健康状态检测方法及装置,用以实现电池健康程度的在线检测。The embodiment of the invention provides a battery health state detecting method and device for realizing online detection of battery health.
本发明实施例提供了一种电池健康状态检测方法,包括:An embodiment of the present invention provides a battery health state detecting method, including:
采集待测电池在同时刻的电压值和容量值;Collecting the voltage value and capacity value of the battery to be tested at the same time;
根据两次采集的电压值和容量值,分别计算容量差值和电压差值;Calculating the capacity difference and the voltage difference according to the voltage value and the capacity value collected twice;
确定所述容量差值和所述电压差值的比值;
Determining a ratio of the capacity difference to the voltage difference;
根据预设的比值与老化系数的对应关系,获取与确定的比值对应的老化系数。Obtain an aging coefficient corresponding to the determined ratio according to a preset relationship between the ratio and the aging coefficient.
在示例性的实施方式中,所述根据两次采集的电压值和容量值,分别计算容量差值和电压差值的步骤,包括:In an exemplary embodiment, the step of separately calculating a capacity difference value and a voltage difference value according to the two collected voltage values and capacity values, including:
当第n次采集的电压值与第1次采集的电压值的差值达到预设压差阈值时,根据第n次和第1次采集的电压值和容量值,分别计算所述容量差值和所述电压差值;其中每次进行电池健康状态检测时的采集为第1次采集,n为大于1的自然数。When the difference between the voltage value collected in the nth time and the voltage value collected in the first time reaches the preset pressure difference threshold, the capacity difference is calculated according to the voltage value and the capacity value collected at the nth and the first time respectively. And the voltage difference; wherein the acquisition is performed every time the battery health state detection is performed, and n is a natural number greater than 1.
在示例性的实施方式中,所述采集待测电池在同时刻的电压值和容量值的步骤之前,电池健康状态检测方法还包括:In an exemplary embodiment, before the step of collecting the voltage value and the capacity value of the battery to be tested, the battery health state detecting method further includes:
当所述待测电池处于充电状态时,停止采集同时刻的电压值和容量值,并舍弃采集到的电压值和容量值;When the battery to be tested is in a charging state, stop collecting the voltage value and the capacity value at the same time, and discard the collected voltage value and capacity value;
当所述待测电池处于非充电状态,并且所述待测电池的电压处于预设稳定状态时,采集同时刻的电压值和容量值。When the battery to be tested is in a non-charging state, and the voltage of the battery to be tested is in a preset steady state, the simultaneously recorded voltage value and capacity value are collected.
在示例性的实施方式中,预设比值与老化系数的对应关系的方式包括:In an exemplary embodiment, the manner of presetting the correspondence between the ratio and the aging coefficient includes:
对设定个数的与所述待测电池同类型的电池进行老化测试;Performing an aging test on a set number of batteries of the same type as the battery to be tested;
根据所述老化测试,获得一典型的老化曲线;所述老化曲线为电量变化循环累加值与老化系数对应的曲线;Obtaining a typical aging curve according to the aging test; the aging curve is a curve corresponding to the aging coefficient of the charge change cycle accumulated value;
根据所述老化曲线,确定每个电量变化循环累加值对应的斜率,所述斜率为容量差值和电压差值的比值;Determining, according to the aging curve, a slope corresponding to each of the charge change cycle accumulated values, wherein the slope is a ratio of the capacity difference value to the voltage difference value;
根据所述斜率和所述老化曲线,设置比值与老化系数的对应关系。Corresponding relationship between the ratio and the aging coefficient is set according to the slope and the aging curve.
在示例性的实施方式中,所述根据所述老化测试,获得一典型的老化曲线的步骤,包括:In an exemplary embodiment, the step of obtaining a typical aging curve according to the aging test comprises:
记录每个电池的各电量变化循环累加值和分别对应的老化系数信息;Recording the cumulative value of each power change cycle of each battery and the corresponding aging coefficient information;
根据记录的信息,确定所有电池在每个相同的电量变化循环累加值处对应的老化系数范围;Determining, according to the recorded information, a range of aging coefficients corresponding to all of the batteries at each of the same charge change cycle accumulation values;
从对应的老化系数范围中选择各相同的电量变化循环累加值分别对应的
典型老化系数;Selecting the same electric quantity change cycle accumulating value corresponding to each of the corresponding aging coefficient ranges
Typical aging factor;
根据各相同的电量变化循环累加值分别对应的典型老化系数确定典型的老化曲线。A typical aging curve is determined according to the typical aging coefficients corresponding to the respective cumulative values of the respective power change cycles.
在示例性的实施方式中,所述采集待测电池在同时刻的电压值和容量值的步骤之前,电池健康状态检测方法还包括:In an exemplary embodiment, before the step of collecting the voltage value and the capacity value of the battery to be tested, the battery health state detecting method further includes:
周期性采集所述待测电池的电量值;Periodically collecting the power value of the battery to be tested;
根据采集的电量值,确定所述待测电池当前的电量变化循环累;Determining, according to the collected electric quantity value, the current electric quantity change cycle of the battery to be tested;
获取所述待测电池当前的电量变化循环累加值对应的老化系数范围;Obtaining an aging coefficient range corresponding to a current accumulated value of the current battery change of the battery to be tested;
所述根据预设的比值与老化系数的对应关系,获取与确定的比值对应的老化系数的步骤,包括:And the step of obtaining an aging coefficient corresponding to the determined ratio according to the preset relationship between the ratio and the aging coefficient, including:
根据预设的比值与老化系数的对应关系,在所述当前的电量变化循环累加值对应的老化系数范围内,获取与确定的比值对应的老化系数。And obtaining, according to a preset relationship between the ratio and the aging coefficient, an aging coefficient corresponding to the determined ratio within the range of aging coefficients corresponding to the current accumulated value of the power change cycle.
在示例性的实施方式中,所述根据采集的电量值,确定所述待测电池当前的电量变化循环累的步骤,包括:In an exemplary embodiment, the determining, according to the collected electric quantity value, the step of calculating the current electric quantity change cycle of the battery to be tested includes:
加载前次获取待测电池的老化系数范围时对应的电量变化循环累加值;Loading the cumulative value of the corresponding power change cycle when the aging coefficient range of the battery to be tested is acquired last time;
根据采集的电量值,确定电量变化循环累加值;Determining the accumulated value of the power change cycle according to the collected power value;
当确定的电量变化循环累加值相对于加载的电量变化循环累加值增加设定计算阈值时,将确定的电量变化循环累加值确定为当前的电量变化循环累。When the determined power change cycle cumulative value is increased relative to the loaded power change cycle cumulative value increase setting calculation threshold value, the determined power change cycle cumulative value is determined as the current power change cycle tired.
本发明实施例提供了一种计算机可读存储介质,存储有计算机可执行指令,所述计算机可执行指令被处理器执行时实现上述的电池健康状态检测方法。Embodiments of the present invention provide a computer readable storage medium storing computer executable instructions, which are implemented by a processor to implement the battery health state detecting method described above.
本发明的实施例提供了一种电池健康状态检测装置,包括:Embodiments of the present invention provide a battery health state detecting apparatus, including:
采样模块,设置成采集待测电池在同时刻的电压值和容量值;The sampling module is configured to collect the voltage value and the capacity value of the battery to be tested at the same time;
参数计算模块,设置成根据两次采集的电压值和容量值,分别计算容量差值和电压差值;The parameter calculation module is configured to calculate the capacity difference and the voltage difference respectively according to the two collected voltage values and capacity values;
斜率确定模块,设置成确定所述容量差值和所述电压差值的比值;a slope determining module configured to determine a ratio of the capacity difference value to the voltage difference value;
老化确定模块,设置成根据预设的比值与老化系数的对应关系,获取与
确定的比值对应的老化系数。The aging determination module is configured to acquire and match according to a preset ratio of the ratio and the aging coefficient
The aging factor corresponding to the determined ratio.
在示例性的实施方式中,所述参数计算模块是设置成当第n次采集的电压值与第1次采集的电压值的差值达到预设压差阈值时,根据第n次和第1次采集的电压值和容量值,分别计算所述容量差值和所述电压差值;其中每次进行电池健康状态检测时的采集为第1次采集,n为大于1的自然数。In an exemplary embodiment, the parameter calculation module is configured to set the difference between the voltage value acquired in the nth time and the voltage value collected in the first time to reach the preset pressure difference threshold, according to the nth and the first The collected voltage value and the capacity value respectively calculate the capacity difference value and the voltage difference value; wherein each time the battery health state detection is performed, the acquisition is the first acquisition, and n is a natural number greater than 1.
在示例性的实施方式中,所述采样模块是设置成当所述待测电池处于充电状态时,停止采集同时刻的电压值和容量值,并舍弃采集到的电压值和容量值;In an exemplary embodiment, the sampling module is configured to stop collecting the simultaneously recorded voltage value and capacity value when the battery to be tested is in a charging state, and discard the collected voltage value and capacity value;
当所述待测电池处于非充电状态,并且所述待测电池的电压处于预设稳定状态时,采集同时刻的电压值和容量值。When the battery to be tested is in a non-charging state, and the voltage of the battery to be tested is in a preset steady state, the simultaneously recorded voltage value and capacity value are collected.
在示例性的实施方式中,所述装置还包括循环累加模块,所述循环累加模块包括:In an exemplary embodiment, the apparatus further includes a cyclic accumulation module, the cyclic accumulation module comprising:
典型曲线获取模块,设置成根据所述老化测试,获得一典型的老化曲线;所述老化曲线为电量变化循环累加值与老化系数对应的曲线;a typical curve acquisition module is configured to obtain a typical aging curve according to the aging test; the aging curve is a curve corresponding to a aging coefficient of a charge change cycle cumulative value;
斜率检测模块,设置成根据所述老化曲线,确定每个电量变化循环累加值对应的斜率,所述斜率为容量差值和电压差值的比值;a slope detecting module, configured to determine, according to the aging curve, a slope corresponding to each of the charge change cycle accumulated values, wherein the slope is a ratio of the capacity difference value to the voltage difference value;
设置模块,设置成根据所述斜率和所述老化曲线,设置比值与老化系数的对应关系。And a setting module configured to set a correspondence between the ratio and the aging coefficient according to the slope and the aging curve.
在示例性的实施方式中,所述典型曲线获取模块是设置成记录每个电池的各电量变化循环累加值和分别对应的老化系数信息;In an exemplary embodiment, the typical curve acquisition module is configured to record each power change cycle cumulative value of each battery and corresponding corresponding aging coefficient information;
根据记录的信息,确定所有电池在每个相同的电量变化循环累加值处对应的老化系数范围;Determining, according to the recorded information, a range of aging coefficients corresponding to all of the batteries at each of the same charge change cycle accumulation values;
从对应的老化系数范围中选择各相同的电量变化循环累加值分别对应的典型老化系数;Selecting a typical aging coefficient corresponding to each of the same power change cycle cumulative values from the corresponding aging coefficient ranges;
根据各相同的电量变化循环累加值分别对应的典型老化系数确定典型的老化曲线。A typical aging curve is determined according to the typical aging coefficients corresponding to the respective cumulative values of the respective power change cycles.
在示例性的实施方式中,所述采样模块,还设置成周期性采集所述待测电池的电量值;
In an exemplary embodiment, the sampling module is further configured to periodically collect the power value of the battery to be tested;
所述老化确定模块是设置成:根据采集的电量值,确定所述待测电池当前的电量变化循环累;获取所述待测电池当前的电量变化循环累加值对应的老化系数范围;根据预设的比值与老化系数的对应关系,在所述当前的电量变化循环累加值对应的老化系数范围内,获取与确定的比值对应的老化系数。The aging determination module is configured to: determine, according to the collected electric quantity value, a current electric quantity change cycle of the battery to be tested; and obtain an aging coefficient range corresponding to a current accumulated electric energy change cycle cumulative value of the battery to be tested; The corresponding relationship between the ratio and the aging coefficient is obtained within the range of the aging coefficient corresponding to the current accumulated value of the electric quantity change cycle, and the aging coefficient corresponding to the determined ratio is obtained.
在示例性的实施方式中,所述老化确定模块是设置成加载前次获取待测电池的老化系数范围时对应的电量变化循环累加值;In an exemplary embodiment, the aging determination module is configured to load a corresponding power change cycle cumulative value when the aging coefficient range of the battery to be tested is acquired last time;
根据采集的电量值,确定电量变化循环累加值;Determining the accumulated value of the power change cycle according to the collected power value;
当确定的电量变化循环累加值相对于加载的电量变化循环累加值增加设定计算阈值时,将确定的电量变化循环累加值确定为当前的电量变化循环累。When the determined power change cycle cumulative value is increased relative to the loaded power change cycle cumulative value increase setting calculation threshold value, the determined power change cycle cumulative value is determined as the current power change cycle tired.
本发明实施例有益效果如下:The beneficial effects of the embodiments of the present invention are as follows:
本发明实施例提供的方法及装置通过确定容量差值和电压差值的比值;根据预设的比值与老化系数的对应关系,获取与确定的比值对应的老化系数,从而实现电池健康程度的在线检测,且相对于完全放电法,有效降低了检测时间。The method and the device provided by the embodiments of the present invention determine the ratio of the capacity difference and the voltage difference; according to the correspondence between the preset ratio and the aging coefficient, obtain an aging coefficient corresponding to the determined ratio, thereby realizing the battery health degree online. Detection, and relative to the full discharge method, effectively reduces the detection time.
在阅读并理解了附图和详细描述后,可以明白其他方面。Other aspects will be apparent upon reading and understanding the drawings and detailed description.
附图概述BRIEF abstract
图1是本发明实施例中一种电池健康状态检测方法的流程图;1 is a flowchart of a battery health state detecting method according to an embodiment of the present invention;
图2是本发明实施例中一系列Nsoc与λ对应的曲线示意图;2 is a schematic diagram showing a series of N soc and λ corresponding to an embodiment of the present invention;
图3是本发明实施例中同一电池经过不同充放电循环后不同老化程度的曲线α、β、γ示意图;3 is a schematic view showing curves α, β, and γ of different ages after the same battery undergoes different charge and discharge cycles in the embodiment of the present invention;
图4是本发明实施例中中止检测的流程示意图;4 is a schematic flow chart of suspension detection in an embodiment of the present invention;
图5是本发明实施例中同一种电池若干崭新状态下经过1000次充放电循环后老化曲线示意图;5 is a schematic diagram showing an aging curve after 1000 cycles of charge and discharge in a new state of the same battery in the embodiment of the present invention;
图6是本发明实施例中循环累计法具体流程图;6 is a specific flowchart of a loop accumulation method in an embodiment of the present invention;
图7是本发明实施例中斜率法具体流程图;
7 is a specific flow chart of a slope method in an embodiment of the present invention;
图8是本发明实施例中一种电池健康状态检测装置的结构示意图。FIG. 8 is a schematic structural diagram of a battery health state detecting apparatus according to an embodiment of the present invention.
本发明实施例提供了一种电池健康状态检测方法及装置,以下结合附图以及实施例,对本发明实施例进行进一步详细说明。The embodiments of the present invention provide a method and an apparatus for detecting a health state of a battery. The embodiments of the present invention are further described in detail below with reference to the accompanying drawings and embodiments.
如图1所示,本发明第一实施例提供一种电池健康状态检测方法,包括步骤S101-步骤S104。As shown in FIG. 1 , a first embodiment of the present invention provides a battery health state detecting method, including steps S101 to S104.
步骤S101,按照设定的采样周期,连续采集待测电池在同时刻的电压值和容量值;其中,采样周期的大小可以根据实际情况设定。Step S101, continuously collecting the voltage value and the capacity value of the battery to be tested at the same time according to the set sampling period; wherein the size of the sampling period can be set according to actual conditions.
步骤S102,根据两次采集的电压值和容量值,分别计算容量差值和电压差值。Step S102, calculating a capacity difference value and a voltage difference value according to the two collected voltage values and capacity values.
步骤S103,确定所述容量差值和所述电压差值的比值。Step S103, determining a ratio of the capacity difference value to the voltage difference value.
步骤S104,根据预设的比值与老化系数的对应关系,获取与确定的比值对应的老化系数。Step S104: Acquire an aging coefficient corresponding to the determined ratio according to a correspondence between the preset ratio and the aging coefficient.
本发明实施例通过确定容量差值和电压差值的比值;根据预设的比值与老化系数的对应关系,获取与确定的比值对应的老化系数,从而实现电池健康程度的在线检测。In the embodiment of the present invention, the ratio of the capacity difference to the voltage difference is determined; according to the correspondence between the preset ratio and the aging coefficient, an aging coefficient corresponding to the determined ratio is obtained, thereby realizing online detection of battery health.
基于测量结果准确性的考虑,一般采用完全放电法进行测量。但是,完全放电法只能离线测试,并且需要很长的测试时间,本发明实施例相对于完全放电法,有效降低了检测时间,实现了实时的在线检测。Based on the accuracy of the measurement results, the full discharge method is generally used for measurement. However, the full discharge method can only be tested offline, and requires a long test time. Compared with the complete discharge method, the embodiment of the invention effectively reduces the detection time and realizes real-time online detection.
也就是说,本发明实施例预先测试得到的Nsoc-λ的记录点时的一系列电池电压-可用容量(Vbat-Capacity)数据;然后通过实测△V-△C斜率,将该斜率与预先测试得到的电压-可用容量(Vbat-Capacity)数据做对标,可以获得与该斜率最接近的Nsoc-λ的记录点,从而得到对应的老化系数。其中,Nsoc指的是电量变化循环累加值,λ是电池老化系数,△V是电压差值,△C是电容差值。That is, the embodiment of the present invention pre-tests a series of battery voltage-availability (V bat -Capacity) data when the recorded point of N soc -λ is obtained; then the slope is determined by the measured ΔV-ΔC slope. The pre-tested voltage-availability (V bat -Capacity) data is used as a benchmark, and the recording point of N soc -λ closest to the slope can be obtained, thereby obtaining a corresponding aging coefficient. Among them, N soc refers to the cumulative value of the power change cycle, λ is the battery aging coefficient, ΔV is the voltage difference, and ΔC is the capacitance difference.
在上述实施例的基础上,提出上述实施例的变型实施例,在此需要说明的是,为了使描述简要,在各变型实施例中仅描述与上述实施例的不同之处。
On the basis of the above-described embodiments, a modified embodiment of the above-described embodiment is proposed. It is to be noted that, in order to simplify the description, only the differences from the above embodiment will be described in the respective modified embodiments.
在本发明的一个实施例中,根据△V-△C斜率法来预设比值与老化系数的对应关系。也就是说,预设比值与老化系数的对应关系的方式包括:In one embodiment of the present invention, the correspondence between the ratio and the aging coefficient is preset according to the ΔV-ΔC slope method. That is to say, the manner in which the preset ratio and the aging coefficient correspond to each other includes:
对设定个数的与所述待测电池同类型的电池进行老化测试;Performing an aging test on a set number of batteries of the same type as the battery to be tested;
根据所述老化测试,获得一典型的老化曲线;所述老化曲线反映电量变化循环累加值与老化系数对应关系;也就是说,该老化曲线具体为每个电量变化循环累加值与该电量变化循环累加值对应的老化系数的曲线。According to the aging test, a typical aging curve is obtained; the aging curve reflects the relationship between the accumulated value of the power change cycle and the aging coefficient; that is, the aging curve is specifically the cumulative value of each power change cycle and the power change cycle. The curve of the aging coefficient corresponding to the accumulated value.
根据所述老化曲线,确定每个电量变化循环累加值对应的斜率,所述斜率为容量差值和电压差值的比值;Determining, according to the aging curve, a slope corresponding to each of the charge change cycle accumulated values, wherein the slope is a ratio of the capacity difference value to the voltage difference value;
根据所述斜率和所述老化曲线,设置比值与老化系数的对应关系。Corresponding relationship between the ratio and the aging coefficient is set according to the slope and the aging curve.
在示例性的实施方式中,本发明实施例根据电量变化累加的方法来对电池进行老化测试,也就是说所述根据所述老化测试,获得一典型的老化曲线的步骤,包括:In an exemplary embodiment, the embodiment of the present invention performs an aging test on the battery according to the method of accumulating the amount of the electric quantity, that is, the step of obtaining a typical aging curve according to the aging test, including:
按照设定的累加值变化步进,记录每个电池的各电量变化循环累加值和对应的老化系数信息;Stepping according to the set accumulated value change, recording the cumulative value of each power change cycle of each battery and the corresponding aging coefficient information;
根据记录的信息,确定所有电池在每个相同的电量变化循环累加值处对应的老化系数范围;Determining, according to the recorded information, a range of aging coefficients corresponding to all of the batteries at each of the same charge change cycle accumulation values;
从对应的老化系数范围中选择所述每个相同的电量变化循环累加值对应的典型老化系数值;Selecting, from the corresponding range of aging coefficients, a typical aging coefficient value corresponding to each of the same power change cycle cumulative values;
根据所述每个相同的电量变化循环累加值对应的典型老化系数值确定典型的老化曲线。A typical aging curve is determined based on the typical aging coefficient values corresponding to each of the same charge change cycle accumulated values.
在本发明的另一个实施例中,所述采集待测电池在同时刻的电压值和容量值的步骤之前,该方法还包括:In another embodiment of the present invention, before the step of collecting the voltage value and the capacity value of the battery to be tested at the same time, the method further includes:
周期性采集所述待测电池的电量值;Periodically collecting the power value of the battery to be tested;
根据采集的电量值,确定所述待测电池当前的电量变化循环累;Determining, according to the collected electric quantity value, the current electric quantity change cycle of the battery to be tested;
根据预设的电量变化循环累加值与老化系数范围的对应关系,获取所述待测电池当前的电量变化循环累加值对应的老化系数范围;Obtaining an aging coefficient range corresponding to a current accumulated value of the current battery change cycle of the battery to be tested according to a preset relationship between a cyclical accumulated value and a aging coefficient range;
所述根据预设的比值与老化系数的对应关系,获取与确定的比值对应的
老化系数的步骤,包括:Obtaining, according to a correspondence between a preset ratio and an aging coefficient, obtaining a ratio corresponding to the determined ratio
The steps of the aging factor include:
根据预设的比值与老化系数的对应关系,在所述当前的电量变化循环累加值对应的老化系数范围内,获取与确定的比值对应的老化系数。And obtaining, according to a preset relationship between the ratio and the aging coefficient, an aging coefficient corresponding to the determined ratio within the range of aging coefficients corresponding to the current accumulated value of the power change cycle.
在示例性的实施方式中,所述根据采集的电量值,确定所述待测电池当前的电量变化循环累的步骤,包括:In an exemplary embodiment, the determining, according to the collected electric quantity value, the step of calculating the current electric quantity change cycle of the battery to be tested includes:
加载前次获取待测电池的老化系数范围时对应的电量变化循环累加值;Loading the cumulative value of the corresponding power change cycle when the aging coefficient range of the battery to be tested is acquired last time;
根据采集的电量值,确定电量变化循环累加值;具体包括:当采集的电量值每次变化达到设定累加阈值时,将电量变化循环累加值加1。According to the collected electric quantity value, the cumulative value of the electric quantity change cycle is determined; specifically, when the collected electric quantity value reaches the set accumulating threshold value, the accumulated value of the electric quantity change cycle is incremented by one.
当确定的电量变化循环累加值相对于加载的电量变化循环累加值增加设定计算阈值时,将确定的电量变化循环累加值确定为当前的电量变化循环累。When the determined power change cycle cumulative value is increased relative to the loaded power change cycle cumulative value increase setting calculation threshold value, the determined power change cycle cumulative value is determined as the current power change cycle tired.
简述本发明实施例的实现原理:Briefly describe the implementation principle of the embodiment of the present invention:
根据SOC(电量,State of Capacity)变化对老化的影响,通过电量变化累加的方法进行老化检测。不同电压或电量阶段SOC的变化对电池老化的影响是不同的,所以需要对不同阶段电压或SOC变化增加老化系数。根据循环累加法理论,可以得出以下算法:According to the influence of SOC (State of Capacity) changes on aging, aging detection is performed by the method of accumulating electric quantity changes. The effects of changes in SOC at different voltage or power stages on battery aging are different, so it is necessary to increase the aging factor for voltage or SOC changes at different stages. According to the cyclic accumulation theory, the following algorithm can be derived:
λ=1-a*Nsoc
λ=1-a*N soc
式中,λ是电池老化系数;Nsoc指的是电量变化循环累加值,其中电量每变化1%,Nsoc就加1;a是电量每变化1%带来一定老化的比例。例如,终端中电池出厂时,Nsoc值为0。出厂后开始累加,假定出厂电量为50%,用户连续使用到10%,该值为40;如果用户又充电到100%,该值累加到140(即100+40)。Where λ is the battery aging coefficient; N soc refers to the cumulative value of the charge change cycle, where N soc is incremented by 1% for each change in charge; a is the ratio of aging for every 1% change in charge. For example, when the battery in the terminal is shipped from the factory, the N soc value is 0. After the factory starts to accumulate, it is assumed that the factory power is 50%, the user continuously uses 10%, the value is 40; if the user charges to 100%, the value is added to 140 (ie 100+40).
从图2中可以看出,可以获取一系列的Nsoc-λ坐标,由于老化速度不是线性的,所以根据充放电SOC累加量来计算出不同累加量下的老化。也即累加老化系数会根据累加量不断更新。同时,使用一批电池(设定个数)进行老化测试,得出的老化系数是有高低的,也根据充放电SOC累加量的变化,记录一系列老化系数范围[λlow,λhigh],同时也找一条典型的放电曲线来计算具体的老化系数,这样通过循环累加法可以获取电池的老化系数范围以及典型老化值。这样就可以为下一步准确计算SOH做好了准备。
As can be seen from Fig. 2, a series of N soc - λ coordinates can be obtained. Since the aging speed is not linear, the aging under different accumulated amounts is calculated according to the charge and discharge SOC accumulation amount. That is, the accumulated aging coefficient is continuously updated according to the accumulated amount. At the same time, a batch of batteries (set number) is used for the aging test, and the obtained aging coefficient is high or low. According to the change of the charge and discharge SOC accumulation amount, a series of aging coefficient ranges [λ low , λ high ] are recorded. At the same time, a typical discharge curve is also found to calculate the specific aging coefficient, so that the aging coefficient range of the battery and the typical aging value can be obtained by the cyclic accumulation method. This will prepare you for the accurate calculation of SOH in the next step.
具体说,老化系数范围[λlow,λhigh]的中间值作为典型的老化系数,或者将贴近该用户充点电规律的在该区间内的系数作为典型的老化系数。例如,如图2所述的老化区间0.6~0.65,通过计算中间值得出0.625,能找到目前Nsoc和老化系数0.625对应的一条典型曲线,甚至老化值。但是为了进一步用另外一种方法双重验证老化系数,基于该典型曲线,抛弃典型老化系数,在老化区间内,根据斜率法,再找出该典型老化曲线上对应的老化系数的具体值。值得注意的是该值也必须在老化区间范围内,可能和典型老化系数相同。Specifically, the intermediate value of the aging coefficient range [λ low , λ high ] is taken as a typical aging coefficient, or the coefficient in the interval which is close to the user's charge electric law is taken as a typical aging coefficient. For example, the aging interval of 0.6 to 0.65 as shown in FIG. 2, by calculating the intermediate value of 0.625, can find a typical curve corresponding to the current N soc and the aging coefficient of 0.625, and even the aging value. However, in order to further verify the aging coefficient by another method, based on the typical curve, the typical aging coefficient is discarded, and in the aging interval, the specific value of the corresponding aging coefficient on the typical aging curve is found according to the slope method. It is worth noting that this value must also be within the aging range and may be the same as the typical aging factor.
由上面的方法,可以得出SOH一个较为准确的老化范围。接下来则根据△V-△C斜率法来进一步的确认精确值。也就是说,使用上面的典型曲线在一系列Nsoc-λ的记录点时的一系列电池电压-可用容量Vbat-Capacity数据,通过实测△V-△C斜率,并与循环累加法计算出的老化范围内的典型曲线的Vbat-Capacity数据做对标,可以获得最接近的Nsoc-λ的记录点,那么该老化系数λ系数即为计算出的老化系数。From the above method, a more accurate aging range of SOH can be obtained. Next, the exact value is further confirmed based on the ΔV-ΔC slope method. That is to say, using a series of battery voltage-available capacity V bat -Capacity data at a series of N soc -λ recording points of the typical curve above, the measured ΔV-ΔC slope is measured and calculated by the cyclic accumulation method. The V bat -Capacity data of the typical curve in the aging range is benchmarked, and the closest N soc -λ recording point can be obtained, then the aging coefficient λ coefficient is the calculated aging coefficient.
其中△V-△C斜率法的原理如下:The principle of the ΔV-△C slope method is as follows:
根据不同的老化程度,电池所能释放的容量也是不同的,如图3所示,同一电池经过不同充放电循环后不同老化程度的电池曲线α、β、γ。According to different degrees of aging, the capacity that the battery can release is also different. As shown in Fig. 3, the same battery has different battery aging curves α, β, γ after different charging and discharging cycles.
不同的电压值对应的容量也是不同的,在某一个电压段,利用库仑计或者其他BMS(电池管理系统,Battery Monitor System)技术是可以检测到容量变化值的。图中对于三条曲线,从X电压到Y电压的容量变化是不同的。即:The capacity corresponding to different voltage values is also different. In a certain voltage segment, the capacity change value can be detected by using a coulomb counter or other BMS (Battery Monitor System) technology. For the three curves in the figure, the change in capacity from the X voltage to the Y voltage is different. which is:
因此,可以得出一个重要的结论,从电压X到电压Y,几条曲线的容量变化量△C相对于电压变化量△V的斜率是不同的。依据此斜率可以进一步的确认SOH值。并且所取的电压变化量△V越大,SOH值会越精确。Therefore, an important conclusion can be drawn that the voltage change amount ΔC of the several curves is different from the voltage change amount ΔV from the voltage X to the voltage Y. Based on this slope, the SOH value can be further confirmed. And the larger the voltage change amount ΔV taken, the more accurate the SOH value will be.
就图3而言,可以看出同一电池在不同程度老化后的△V-△C斜率:
As far as Figure 3 is concerned, it can be seen that the ΔV-ΔC slope of the same battery after aging at different degrees:
循环累加法可以获得SOH范围,在此基础上通过从斜率的不同可以计算出更为具体和精确的SOH值。The cyclic accumulation method can obtain the SOH range, on the basis of which a more specific and accurate SOH value can be calculated from the difference in slope.
在本发明的又一个实施例中,所述根据两次采集的电压值和容量值,分别计算容量差值和电压差值的步骤,包括:In still another embodiment of the present invention, the step of separately calculating a capacity difference value and a voltage difference value according to the two collected voltage values and capacity values, including:
当第n次采集的电压值与第1次采集的电压值的差值达到预设压差阈值时,根据第n次和第1次采集的电压值和容量值,分别计算所述容量差值和所述电压差值;其中n为大于1的自然数,在进行电池健康状态检测时进行的采集为第1次采集。When the difference between the voltage value collected in the nth time and the voltage value collected in the first time reaches the preset pressure difference threshold, the capacity difference is calculated according to the voltage value and the capacity value collected at the nth and the first time respectively. And the voltage difference; wherein n is a natural number greater than 1, and the acquisition performed when performing battery health detection is the first acquisition.
本发明实施例增加本发明实施例的检测精度。Embodiments of the present invention increase the detection accuracy of the embodiments of the present invention.
在本发明的又一个实施例中,所述采集待测电池在同时刻的电压值和容量值的步骤之前,还包括:In still another embodiment of the present invention, before the step of collecting the voltage value and the capacity value of the battery to be tested, the method further includes:
当所述待测电池处于充电状态时,停止采集同时刻的电压值和容量值,并舍弃采集到的电压值和容量值;When the battery to be tested is in a charging state, stop collecting the voltage value and the capacity value at the same time, and discard the collected voltage value and capacity value;
当所述待测电池处于非充电状态,并且所述待测电池的电压处于预设稳定状态时,采集同时刻的电压值和容量值。When the battery to be tested is in a non-charging state, and the voltage of the battery to be tested is in a preset steady state, the simultaneously recorded voltage value and capacity value are collected.
如图4所示,在△V-△C斜率法计算过程中,如果设备处于充电状态,则停止该计算过程,并舍弃前面的采样数据,因为充电状态,电池电压会有不同幅度的抬升,这对斜率计算是有较大影响的。As shown in FIG. 4, in the calculation process of the ΔV-ΔC slope method, if the device is in the charging state, the calculation process is stopped, and the previous sampling data is discarded, because the battery voltage will rise in different amplitudes due to the state of charge. This has a large impact on the slope calculation.
步骤S401,连接充电设备,进行充电;Step S401, connecting a charging device to perform charging;
步骤S402,停止△V-△C斜率法计算过程,并舍弃计算过程中的数据;Step S402, stopping the ΔV-ΔC slope method calculation process, and discarding the data in the calculation process;
步骤S403,断开充电设备,停止充电;Step S403, disconnecting the charging device and stopping charging;
步骤S404,开始重新计算流程。
In step S404, the recalculation process is started.
举一具体应用例描述本发明的实现流程。The implementation flow of the present invention will be described with reference to a specific application example.
如图5所示,预先进行老化检测和△V-△C斜率计算的过程:使用在该实例中同一种电池若干崭新状态下经过1000次充放电循环后统计出老化系数范围[λlow,λhigh]为[0.6,0.7],即老化系数在0.6-0.7之间,包括0.6和0.7,典型值为0.65。As shown in FIG. 5, the process of aging detection and ΔV-ΔC slope calculation is performed in advance: the aging coefficient range [λ low , λ is calculated after 1000 charge and discharge cycles in several new states of the same battery in this example. High ] is [0.6, 0.7], that is, the aging coefficient is between 0.6 and 0.7, including 0.6 and 0.7, and the typical value is 0.65.
从上面图5的放电曲线上取一系列的坐标(比如整数充放电循环次数时),可以获取不同充放电循环后的老化系数,从而也可以获取电量变化循环累加值对应的老化系数范围和典型值。Taking a series of coordinates (such as the number of integer charge and discharge cycles) from the discharge curve of Figure 5 above, the aging coefficient after different charge and discharge cycles can be obtained, so that the range of aging coefficients corresponding to the cumulative value of the charge change cycle can be obtained. value.
如图6所示,具体老化检测的循环累计法包括:As shown in FIG. 6, the cyclic accumulation method of specific aging detection includes:
步骤S601,电池监控系统BMS提供电量变化信息,一般情况下变化幅度是1%;Step S601, the battery monitoring system BMS provides the power change information, and the variation range is generally 1%;
步骤S602,当电量变化的时候,跳至S603。否则,跳至步骤S604。In step S602, when the power is changed, the process jumps to S603. Otherwise, the process goes to step S604.
步骤S603,基于步骤S602,电量累加值Nsoc相应地增加,并且复位定时器。Step S603, based on step S602, the power accumulation value N soc is correspondingly increased, and the timer is reset.
步骤S604,当定时器触发的时候,会自动查询一下电量,然后复位定时器,继续计时,本实例中定时器设置为10分钟;Step S604, when the timer is triggered, the power is automatically queried, then the timer is reset, and the timer is continued. In this example, the timer is set to 10 minutes;
步骤S605,当新的电量累加值Nsoc与上次计算SOH值使用的电量累加值Nsoc相比增加一定值的时候,比如100mAh,开始老化系数计算;Step S605, when a new battery accumulated value of the last N soc SOH value calculated using the amount accumulated value N soc increased when compared to a predetermined value, for example 100 mAh, aging coefficient calculation starts;
步骤S606,加载上次计算SOH值使用的电量累加值,从电量老化基础数据里查询所需数据;Step S606, loading the accumulated value of the power used in the last calculation of the SOH value, and querying the required data from the basic data of the power aging;
步骤S607,SOH(即λ)值区间的计算。根据新的电量累加值Nsoc和提前存储的该电池老化系数与电量累加值数据Nsoc-λlow表、Nsoc-λhigh表,和Nsoc-典型λ表,我们可以查表获取[λlow,λhigh]以及典型的λ。Step S607, calculation of the SOH (ie, λ) value interval. According to the new electric charge accumulating value N soc and the battery aging coefficient and the electric energy accumulating value data N soc - λ low table, N soc - λ high table, and N soc - typical λ table stored in advance, we can look up the table to obtain [λ Low , λ high ] and typical λ.
本实例中,电量累加值Nsoc为200100,即充放电循环次数为1000.5次。由于本实例中的电量累加值Nsoc-λ表只存储了整数充放电次数下的电池老化系数,所以通过查表获取到该Nsoc在1000次和1001次的点,我们选取充放电循环次数低的值,即[λlow,λhigh]为[0.6,0.7],典型老化系数为0.65。In this example, the electric charge accumulated value N soc is 200100, that is, the number of charge and discharge cycles is 1000.5 times. Since the electric charge accumulating value N soc - λ table in this example only stores the battery aging coefficient under the integer number of charge and discharge times, the N soc is obtained by looking up the table at 1000 and 1001 times, and we select the number of charge and discharge cycles. The low value, ie [λ low , λ high ] is [0.6, 0.7], and the typical aging coefficient is 0.65.
步骤S608,将新的老化系数范围以及典型的老化系数与上一次计算的值
相对比,若均小于上次的值,则为有效,跳至步骤S610;若大于上次的值,则无效,跳至步骤S609;Step S608, the new aging coefficient range and the typical aging coefficient and the last calculated value
If the ratio is less than the last value, it is valid, skip to step S610; if it is greater than the last value, it is invalid, skip to step S609;
步骤S609,计算的值是无效的,则将电量累加值Nsoc更新并存储,老化系数范围以及典型的老化系数不更新;Step S609, if the calculated value is invalid, the electric quantity accumulated value N soc is updated and stored, and the aging coefficient range and the typical aging coefficient are not updated;
步骤S610,将电量累加值Nsoc更新并存储,将老化系数范围以及典型的老化系数更新并存储。In step S610, the electric quantity accumulated value N soc is updated and stored, and the aging coefficient range and the typical aging coefficient are updated and stored.
如图7所示,具体老化检测的△V-△C斜率法包括:As shown in Figure 7, the ΔV-ΔC slope method for specific aging detection includes:
基于循环累计法得到的电池老化SOH区间值的。本实施例是根据电池从4.1V到3.6V的容量变化来计算斜率,再对标存储的斜率表,来获取最终的电池老化系数的,如图7所示,包括:The battery aging SOH interval value obtained based on the cyclic accumulation method. In this embodiment, the slope is calculated according to the capacity change of the battery from 4.1V to 3.6V, and the slope table of the target storage is obtained to obtain the final battery aging coefficient, as shown in FIG. 7, including:
步骤S701,电池监控系统BMS可以提供电池电压、实时容量等电池数据。In step S701, the battery monitoring system BMS can provide battery data such as battery voltage and real-time capacity.
步骤S702,电池处于休眠状态一段时间(比如十分钟)后,电池电压会趋于稳定。在电压趋于稳定后,开始采样电压,并记录。本实例中,采样到的电池电压为4.1V;In step S702, after the battery is in the sleep state for a period of time (for example, ten minutes), the battery voltage tends to be stable. After the voltage has stabilized, the sampling voltage is started and recorded. In this example, the sampled battery voltage is 4.1V;
步骤S703,基于步骤S702,在采样电压的同时,也同步记录电池的可用容量值。本实例中,获取的可用容量值为1500mAh。Step S703, based on step S702, simultaneously recording the available capacity value of the battery while sampling the voltage. In this example, the available usable capacity value is 1500 mAh.
步骤S704,与步骤S702相同,在电池电压趋于稳定后,采样电压,若与步骤S702中获取的电压对比。本实例中经过了50分钟的使用和10分钟的休眠后,获得到新电池电压值为3.6V。Step S704, as in step S702, after the battery voltage tends to be stable, the voltage is sampled, if compared with the voltage obtained in step S702. In this example, after 50 minutes of use and 10 minutes of dormancy, a new battery voltage of 3.6V was obtained.
步骤S705,基于步骤S704,若压差大于0.4V,跳至步骤S706,否则跳至步骤S704继续检测。在本示例中,压差达到了(4.1-3.6)V,即0.5V,复合要求。Step S705, based on step S704, if the pressure difference is greater than 0.4V, the process goes to step S706, otherwise the process goes to step S704 to continue the detection. In this example, the differential pressure reached (4.1-3.6) V, or 0.5 V, compounding requirements.
步骤S706,基于步骤S705,获取到可用容量值为500mAh,两次采样可用容量变化量为(1500-500)mAh,即1000mAh。Step S706, based on step S705, obtaining an available capacity value of 500 mAh, and the two sampling available capacity change amount is (1500-500) mAh, that is, 1000 mAh.
步骤S707,基于前面的步骤,计算△V-△C斜率k:Step S707, based on the previous steps, calculate the ΔV-ΔC slope k:
步骤S708,从典型曲线不同老化程度下的电压-容量表,再结合循环累加法计算出的电池老化系数区间范围,可以计算出在该范围内的同样电压变化对应的若干斜率值。在本示例中,电池老化系数区间范围为[0.6,0.7]。在该区间内,有若干典型曲线不同老化程度的电压-容量表,如下表一:In step S708, a plurality of slope values corresponding to the same voltage change in the range can be calculated from the voltage-capacity table of different typical degrees of aging and the range of the battery aging coefficient calculated by the cyclic accumulation method. In this example, the battery aging factor range is [0.6, 0.7]. Within this interval, there are several voltage-capacity tables with typical curves with different degrees of aging, as shown in Table 1:
老化系数Aging coefficient | 电压变化Voltage change | 容量变化Capacity change | 斜率Slope |
0.60.6 | 4.1V降低到3.6V4.1V reduced to 3.6V | 900mAh900mAh | 1.81.8 |
0.610.61 | 4.1V降低到3.6V4.1V reduced to 3.6V | 920mAh920mAh | 1.841.84 |
0.620.62 | 4.1V降低到3.6V4.1V reduced to 3.6V | 940mAh940mAh | 1.881.88 |
0.630.63 | 4.1V降低到3.6V4.1V reduced to 3.6V | 960mAh960mAh | 1.921.92 |
0.640.64 | 4.1V降低到3.6V4.1V reduced to 3.6V | 980mAh980mAh | 1.961.96 |
0.650.65 | 4.1V降低到3.6V4.1V reduced to 3.6V | 1000mAh1000mAh | 22 |
0.660.66 | 4.1V降低到3.6V4.1V reduced to 3.6V | 1020mAh1020mAh | 2.042.04 |
0.670.67 | 4.1V降低到3.6V4.1V reduced to 3.6V | 1040mAh1040mAh | 2.082.08 |
0.680.68 | 4.1V降低到3.6V4.1V reduced to 3.6V | 1060mAh1060mAh | 2.122.12 |
0.690.69 | 4.1V降低到3.6V4.1V reduced to 3.6V | 1080mAh1080mAh | 2.162.16 |
0.70.7 | 4.1V降低到3.6V4.1V reduced to 3.6V | 1100mAh1100mAh | 2.22.2 |
步骤S709,在本示例中,电池老化系数区间范围为[0.6,0.7]。该区间是由循环累加法获得的;Step S709, in this example, the battery aging coefficient interval range is [0.6, 0.7]. This interval is obtained by the cyclic accumulation method;
步骤S710,在步骤S707中,由△V-△C斜率法,得到斜率k为2。对标上表的斜率,得到对标曲线所对应的老化系数为0.65;In step S710, in step S707, the slope k is obtained by the ΔV-ΔC slope method. For the slope of the marked table, the aging coefficient corresponding to the calibration curve is 0.65;
步骤S711,基于步骤S710,获得的SOH老化系数为0.65;Step S711, based on step S710, the SOH aging coefficient obtained is 0.65;
步骤S712,获取目前存储的SOH值,若新计算出来的SOH值小于该值,则认定为有效,跳至步骤S714。无效的话跳至步骤S713,本实例中目前存储的SOH值也为0.65,所以跳至S714;In step S712, the currently stored SOH value is obtained. If the newly calculated SOH value is less than the value, it is determined to be valid, and the process goes to step S714. If it is invalid, skip to step S713, and the SOH value currently stored in this example is also 0.65, so skip to S714;
步骤S713,如果新SOH值无效的话,结束本次计算;Step S713, if the new SOH value is invalid, the current calculation is ended;
步骤S714,更新老化系数并存储;
Step S714, updating the aging coefficient and storing;
步骤S715,本次计算完成。In step S715, the calculation is completed.
本发明实施例提供了一种计算机可读存储介质,存储有计算机可执行指令,所述计算机可执行指令被处理器执行时实现上述的电池健康状态检测方法。基于上述各实施例的电池健康状态检测方法,本发明实施例还提出一种电池健康状态检测装置。Embodiments of the present invention provide a computer readable storage medium storing computer executable instructions, which are implemented by a processor to implement the battery health state detecting method described above. Based on the battery health state detecting method of the above embodiments, the embodiment of the present invention further provides a battery health state detecting device.
如图8所示,本发明实施例中一种电池健康状态检测装置包括:As shown in FIG. 8, a battery health state detecting apparatus according to an embodiment of the present invention includes:
采样模块810,设置成采集待测电池在同时刻的电压值和容量值;The sampling module 810 is configured to collect the voltage value and the capacity value of the battery to be tested at the same time;
参数计算模块811,设置成根据两次采集的电压值和容量值,分别计算容量差值和电压差值;The parameter calculation module 811 is configured to calculate a capacity difference value and a voltage difference value respectively according to the two collected voltage values and capacity values;
斜率确定模块812,设置成确定所述容量差值和所述电压差值的比值;a slope determination module 812 configured to determine a ratio of the capacity difference value to the voltage difference value;
老化确定模块813,设置成根据预设的比值与老化系数的对应关系,获取与确定的比值对应的老化系数。The aging determination module 813 is configured to obtain an aging coefficient corresponding to the determined ratio according to a correspondence between the preset ratio and the aging coefficient.
本发明实施例通过确定容量差值和电压差值的比值;根据预设的比值与老化系数的对应关系,获取与确定的比值对应的老化系数,从而实现电池健康程度的在线检测。In the embodiment of the present invention, the ratio of the capacity difference to the voltage difference is determined; according to the correspondence between the preset ratio and the aging coefficient, an aging coefficient corresponding to the determined ratio is obtained, thereby realizing online detection of battery health.
基于测量结果准确性的考虑,目前一般采用完全放电法进行测量。但是,完全放电法只能离线测试,并且需要很长的测试时间,本发明实施例相对于完全放电法,且有效降低了检测时间,实现了实时的在线检测。Based on the accuracy of the measurement results, the full discharge method is generally used for measurement. However, the full discharge method can only be tested offline, and requires a long test time. Compared with the complete discharge method, the embodiment of the present invention effectively reduces the detection time and realizes real-time online detection.
在本发明的一个实施例中,所述参数计算模块811,是设置成:当第n次采集的电压值与第1次采集的电压值的差值达到预设压差阈值时,根据第n次和第1次采集的电压值和容量值,分别计算所述容量差值和所述电压差值;其中每次进行电池健康状态检测时的采集为第一次采集,n为大于1的自然数。In an embodiment of the present invention, the parameter calculation module 811 is configured to: when the difference between the voltage value acquired in the nth time and the voltage value collected in the first time reaches a preset pressure difference threshold, according to the nth The voltage value and the capacity value collected in the first and the first time respectively calculate the capacity difference value and the voltage difference value; wherein the acquisition is performed for each time the battery health state detection is performed, and n is a natural number greater than 1. .
在本发明的另一个实施例中,所述采样模块是设置成:当所述待测电池处于充电状态时,停止采集同时刻的电压值和容量值,并舍弃采集到的电压值和容量值;In another embodiment of the present invention, the sampling module is configured to stop collecting the simultaneously recorded voltage value and capacity value when the battery to be tested is in a charging state, and discard the collected voltage value and capacity value. ;
当所述待测电池处于非充电状态,并且所述待测电池的电压处于预设稳定状态时,采集同时刻的电压值和容量值。
When the battery to be tested is in a non-charging state, and the voltage of the battery to be tested is in a preset steady state, the simultaneously recorded voltage value and capacity value are collected.
在本发明的又一个实施例中,所述装置还包括循环累加模块,所述循环累加模块包括:In still another embodiment of the present invention, the apparatus further includes a cyclic accumulation module, and the cyclic accumulation module includes:
典型曲线获取模块,设置成:根据所述老化测试,获得一典型的老化曲线;所述老化曲线为电量变化循环累加值与老化系数对应的曲线;The typical curve acquisition module is configured to: obtain a typical aging curve according to the aging test; the aging curve is a curve corresponding to the aging coefficient of the power change cycle cumulative value;
斜率检测模块,设置成根据所述老化曲线,确定每个电量变化循环累加值对应的斜率,所述斜率为容量差值和电压差值的比值;a slope detecting module, configured to determine, according to the aging curve, a slope corresponding to each of the charge change cycle accumulated values, wherein the slope is a ratio of the capacity difference value to the voltage difference value;
设置模块,设置成根据所述斜率和所述老化曲线,设置比值与老化系数的对应关系。And a setting module configured to set a correspondence between the ratio and the aging coefficient according to the slope and the aging curve.
在示例性的实施方式中,所述典型曲线获取模块是设置成记录每个电池的各电量变化循环累加值和分别对应的老化系数信息;In an exemplary embodiment, the typical curve acquisition module is configured to record each power change cycle cumulative value of each battery and corresponding corresponding aging coefficient information;
根据记录的信息,确定所有电池在每个相同的电量变化循环累加值处对应的老化系数范围;Determining, according to the recorded information, a range of aging coefficients corresponding to all of the batteries at each of the same charge change cycle accumulation values;
从对应的老化系数范围中选择各相同的电量变化循环累加值分别对应的典型老化系数;Selecting a typical aging coefficient corresponding to each of the same power change cycle cumulative values from the corresponding aging coefficient ranges;
根据各相同的电量变化循环累加值分别对应的典型老化系数确定典型的老化曲线。A typical aging curve is determined according to the typical aging coefficients corresponding to the respective cumulative values of the respective power change cycles.
在本发明的再一个实施例中,所述采样模块,还设置成周期性采集所述待测电池的电量值;In still another embodiment of the present invention, the sampling module is further configured to periodically collect the power value of the battery to be tested;
所述老化确定模块是设置成:根据采集的电量值,确定所述待测电池当前的电量变化循环累;获取所述待测电池当前的电量变化循环累加值对应的老化系数范围;根据预设的比值与老化系数的对应关系,在所述当前的电量变化循环累加值对应的老化系数范围内,获取与确定的比值对应的老化系数。The aging determination module is configured to: determine, according to the collected electric quantity value, a current electric quantity change cycle of the battery to be tested; and obtain an aging coefficient range corresponding to a current accumulated electric energy change cycle cumulative value of the battery to be tested; The corresponding relationship between the ratio and the aging coefficient is obtained within the range of the aging coefficient corresponding to the current accumulated value of the electric quantity change cycle, and the aging coefficient corresponding to the determined ratio is obtained.
在示例性的实施方式中,所述老化确定模块是设置成:加载前次获取待测电池的老化系数范围时对应的电量变化循环累加值;In an exemplary embodiment, the aging determination module is configured to: load a corresponding power change cycle cumulative value when the aging coefficient range of the battery to be tested is acquired last time;
根据采集的电量值,确定电量变化循环累加值;Determining the accumulated value of the power change cycle according to the collected power value;
当确定的电量变化循环累加值相对于加载的电量变化循环累加值增加设定计算阈值时,将确定的电量变化循环累加值确定为当前的电量变化循环累。
When the determined power change cycle cumulative value is increased relative to the loaded power change cycle cumulative value increase setting calculation threshold value, the determined power change cycle cumulative value is determined as the current power change cycle tired.
本领域普通技术人员可以理解,上文中所公开方法中的全部或某些步骤、系统、装置中的功能模块/单元可以被实施为软件、固件、硬件及其适当的组合。在硬件实施方式中,在以上描述中提及的功能模块/单元之间的划分不一定对应于物理组件的划分;例如,一个物理组件可以具有多个功能,或者一个功能或步骤可以由若干物理组件合作执行。某些组件或所有组件可以被实施为由处理器,如数字信号处理器或微处理器执行的软件,或者被实施为硬件,或者被实施为集成电路,如专用集成电路。这样的软件可以分布在计算机可读介质上,计算机可读介质可以包括计算机存储介质(或非暂时性介质)和通信介质(或暂时性介质)。如本领域普通技术人员公知的,术语计算机存储介质包括在用于存储信息(诸如计算机可读指令、数据结构、程序模块或其他数据)的任何方法或技术中实施的易失性和非易失性、可移除和不可移除介质。计算机存储介质包括但不限于随机存取存储器(RAM,Random Access Memory)、只读存储器(ROM,Read-Only Memory)、电可擦除只读存储器(EEPROM,Electrically Erasable Programmable Read-only Memory)、闪存或其他存储器技术、光盘只读存储器(CD-ROM,Compact Disc Read-Only Memory)、数字多功能盘(DVD)或其他光盘存储、磁盒、磁带、磁盘存储或其他磁存储装置、或者可以用于存储期望的信息并且可以被计算机访问的任何其他的介质。此外,本领域普通技术人员公知的是,通信介质通常包含计算机可读指令、数据结构、程序模块或者诸如载波或其他传输机制之类的调制数据信号中的其他数据,并且可包括任何信息递送介质。Those of ordinary skill in the art will appreciate that all or some of the steps, systems, and functional blocks/units of the methods disclosed above may be implemented as software, firmware, hardware, and suitable combinations thereof. In a hardware implementation, the division between functional modules/units mentioned in the above description does not necessarily correspond to the division of physical components; for example, one physical component may have multiple functions, or one function or step may be composed of several physical The components work together. Some or all of the components may be implemented as software executed by a processor, such as a digital signal processor or microprocessor, or as hardware, or as an integrated circuit, such as an application specific integrated circuit. Such software may be distributed on a computer readable medium, which may include computer storage media (or non-transitory media) and communication media (or transitory media). As is well known to those of ordinary skill in the art, the term computer storage medium includes volatile and nonvolatile, implemented in any method or technology for storing information, such as computer readable instructions, data structures, program modules or other data. Sex, removable and non-removable media. Computer storage media include, but are not limited to, Random Access Memory (RAM), Read-Only Memory (ROM), and Electrically Erasable Programmable Read-only Memory (EEPROM). Flash memory or other memory technology, compact disc read-only memory (CD-ROM), digital versatile disc (DVD) or other optical disc storage, magnetic cassette, magnetic tape, disk storage or other magnetic storage device, or Any other medium used to store the desired information and that can be accessed by the computer. Moreover, it is well known to those skilled in the art that communication media typically includes computer readable instructions, data structures, program modules, or other data in a modulated data signal, such as a carrier wave or other transport mechanism, and can include any information delivery media. .
本领域的普通技术人员可以理解,可以对本公开的技术方案进行修改或者等同替换,而不脱离本公开技术方案的精神和范围,均应涵盖在本公开的权利要求范围当中。A person skilled in the art can understand that the technical solutions of the present disclosure may be modified or equivalent, without departing from the spirit and scope of the present disclosure, and should be included in the scope of the claims of the present disclosure.
本发明实施例提供了电池健康状态检测方法和装置,实现了电池健康程度的在线检测,且有效降低了检测时间。
The embodiment of the invention provides a battery health state detecting method and device, which realizes online detection of battery health and effectively reduces the detection time.
Claims (15)
- 一种电池健康状态检测方法,包括:A battery health detection method includes:采集待测电池在同时刻的电压值和容量值;Collecting the voltage value and capacity value of the battery to be tested at the same time;根据两次采集的电压值和容量值,分别计算容量差值和电压差值;Calculating the capacity difference and the voltage difference according to the voltage value and the capacity value collected twice;确定所述容量差值和所述电压差值的比值;Determining a ratio of the capacity difference to the voltage difference;根据预设的比值与老化系数的对应关系,获取与确定的比值对应的老化系数。Obtain an aging coefficient corresponding to the determined ratio according to a preset relationship between the ratio and the aging coefficient.
- 如权利要求1所述的方法,其中,所述根据两次采集的电压值和容量值,分别计算容量差值和电压差值的步骤,包括:The method of claim 1 wherein said step of calculating a capacity difference and a voltage difference based on the two acquired voltage values and capacity values comprises:当第n次采集的电压值与第1次采集的电压值的差值达到预设压差阈值时,根据第n次和第1次采集的电压值和容量值,分别计算所述容量差值和所述电压差值;其中每次进行电池健康状态检测时的采集为第一次采集,n为大于1的自然数。When the difference between the voltage value collected in the nth time and the voltage value collected in the first time reaches the preset pressure difference threshold, the capacity difference is calculated according to the voltage value and the capacity value collected at the nth and the first time respectively. And the voltage difference; wherein the acquisition is performed every time the battery health state detection is performed, and n is a natural number greater than 1.
- 如权利要求1所述的方法,在所述采集待测电池在同时刻的电压值和容量值的步骤之前,所述方法还包括:The method of claim 1, before the step of collecting the voltage value and the capacity value of the battery to be tested at the same time, the method further comprising:当所述待测电池处于充电状态时,停止采集同时刻的电压值和容量值,并舍弃采集到的电压值和容量值;When the battery to be tested is in a charging state, stop collecting the voltage value and the capacity value at the same time, and discard the collected voltage value and capacity value;当所述待测电池处于非充电状态,并且所述待测电池的电压处于预设稳定状态时,采集同时刻的电压值和容量值。When the battery to be tested is in a non-charging state, and the voltage of the battery to be tested is in a preset steady state, the simultaneously recorded voltage value and capacity value are collected.
- 如权利要求1-3中任意一项所述的方法,预设所述比值与老化系数的对应关系的方式包括:The method according to any one of claims 1 to 3, wherein the manner of presetting the correspondence between the ratio and the aging coefficient comprises:对设定个数的与所述待测电池同类型的电池进行老化测试;Performing an aging test on a set number of batteries of the same type as the battery to be tested;根据所述老化测试,获得一典型的老化曲线;所述老化曲线为电量变化循环累加值与老化系数对应的曲线;Obtaining a typical aging curve according to the aging test; the aging curve is a curve corresponding to the aging coefficient of the charge change cycle accumulated value;根据所述老化曲线,确定每个电量变化循环累加值对应的斜率,所述斜率为容量差值和电压差值的比值;Determining, according to the aging curve, a slope corresponding to each of the charge change cycle accumulated values, wherein the slope is a ratio of the capacity difference value to the voltage difference value;根据所述斜率和所述老化曲线,设置比值与老化系数的对应关系。 Corresponding relationship between the ratio and the aging coefficient is set according to the slope and the aging curve.
- 如权利要求4所述的方法,其中,所述根据所述老化测试,获得一典型的老化曲线的步骤,包括:The method of claim 4, wherein said step of obtaining a typical aging curve according to said aging test comprises:记录每个电池的各电量变化循环累加值和分别对应的老化系数信息;Recording the cumulative value of each power change cycle of each battery and the corresponding aging coefficient information;根据记录的信息,确定所有电池在每个相同的电量变化循环累加值处对应的老化系数范围;Determining, according to the recorded information, a range of aging coefficients corresponding to all of the batteries at each of the same charge change cycle accumulation values;从对应的老化系数范围中选择各相同的电量变化循环累加值分别对应的典型老化系数;Selecting a typical aging coefficient corresponding to each of the same power change cycle cumulative values from the corresponding aging coefficient ranges;根据各相同的电量变化循环累加值分别对应的典型老化系数确定典型的老化曲线。A typical aging curve is determined according to the typical aging coefficients corresponding to the respective cumulative values of the respective power change cycles.
- 如权利要求1-3中任意一项所述的方法,在所述采集待测电池在同时刻的电压值和容量值的步骤之前,所述方法还包括:The method according to any one of claims 1 to 3, before the step of collecting the voltage value and the capacity value of the battery to be tested at the same time, the method further comprises:周期性采集所述待测电池的电量值;Periodically collecting the power value of the battery to be tested;根据采集的电量值,确定所述待测电池当前的电量变化循环累;Determining, according to the collected electric quantity value, the current electric quantity change cycle of the battery to be tested;获取所述待测电池当前的电量变化循环累加值对应的老化系数范围;Obtaining an aging coefficient range corresponding to a current accumulated value of the current battery change of the battery to be tested;所述根据预设的比值与老化系数的对应关系,获取与确定的比值对应的老化系数的步骤,包括:And the step of obtaining an aging coefficient corresponding to the determined ratio according to the preset relationship between the ratio and the aging coefficient, including:根据预设的比值与老化系数的对应关系,在所述当前的电量变化循环累加值对应的老化系数范围内,获取与确定的比值对应的老化系数。And obtaining, according to a preset relationship between the ratio and the aging coefficient, an aging coefficient corresponding to the determined ratio within the range of aging coefficients corresponding to the current accumulated value of the power change cycle.
- 如权利要求6所述的方法,其中,所述根据采集的电量值,确定所述待测电池当前的电量变化循环累的步骤,包括:The method of claim 6, wherein the step of determining the current battery change cycle of the battery to be tested according to the collected power value comprises:加载前次获取待测电池的老化系数范围时对应的电量变化循环累加值;Loading the cumulative value of the corresponding power change cycle when the aging coefficient range of the battery to be tested is acquired last time;根据采集的电量值,确定电量变化循环累加值;Determining the accumulated value of the power change cycle according to the collected power value;当确定的电量变化循环累加值相对于加载的电量变化循环累加值增加设定计算阈值时,将确定的电量变化循环累加值确定为当前的电量变化循环累。When the determined power change cycle cumulative value is increased relative to the loaded power change cycle cumulative value increase setting calculation threshold value, the determined power change cycle cumulative value is determined as the current power change cycle tired.
- 一种电池健康状态检测装置,包括:A battery health detecting device includes:采样模块,设置成采集待测电池在同时刻的电压值和容量值;The sampling module is configured to collect the voltage value and the capacity value of the battery to be tested at the same time;参数计算模块,设置成根据两次采集的电压值和容量值,分别计算容量 差值和电压差值;The parameter calculation module is configured to calculate the capacity separately according to the voltage value and the capacity value collected twice Difference and voltage difference;斜率确定模块,设置成确定所述容量差值和所述电压差值的比值;a slope determining module configured to determine a ratio of the capacity difference value to the voltage difference value;老化确定模块,设置成根据预设的比值与老化系数的对应关系,获取与确定的比值对应的老化系数。The aging determination module is configured to obtain an aging coefficient corresponding to the determined ratio according to a preset relationship between the ratio and the aging coefficient.
- 如权利要求8所述的装置,其中,所述参数计算模块是设置成当第n次采集的电压值与第1次采集的电压值的差值达到预设压差阈值时,根据第n次和第1次采集的电压值和容量值,分别计算所述容量差值和所述电压差值;其中每次进行电池健康状态检测时的采集为第一次采集,n为大于1的自然数。The device according to claim 8, wherein the parameter calculation module is configured to set the difference between the voltage value acquired at the nth time and the voltage value collected at the first time to reach a preset pressure difference threshold, according to the nth time And the voltage value and the capacity value collected for the first time, respectively calculating the capacity difference value and the voltage difference value; wherein each time the battery health state detection is performed, the acquisition is the first acquisition, and n is a natural number greater than 1.
- 如权利要求8所述的装置,其中,所述采样模块是设置成:当所述待测电池处于充电状态时,停止采集同时刻的电压值和容量值,并舍弃采集到的电压值和容量值;The apparatus according to claim 8, wherein said sampling module is configured to stop collecting the simultaneously recorded voltage value and capacity value when said battery to be tested is in a charging state, and discarding the collected voltage value and capacity value;当所述待测电池处于非充电状态,并且所述待测电池的电压处于预设稳定状态时,采集同时刻的电压值和容量值。When the battery to be tested is in a non-charging state, and the voltage of the battery to be tested is in a preset steady state, the simultaneously recorded voltage value and capacity value are collected.
- 如权利要求8-10中任意一项所述的装置,还包括循环累加模块,所述循环累加模块包括:The apparatus of any of claims 8-10, further comprising a cyclic accumulation module, the cyclic accumulation module comprising:典型曲线获取模块,设置成根据所述老化测试,获得一典型的老化曲线;所述老化曲线为电量变化循环累加值与老化系数对应的曲线;a typical curve acquisition module is configured to obtain a typical aging curve according to the aging test; the aging curve is a curve corresponding to a aging coefficient of a charge change cycle cumulative value;斜率检测模块,设置成根据所述老化曲线,确定每个电量变化循环累加值对应的斜率,所述斜率为容量差值和电压差值的比值;a slope detecting module, configured to determine, according to the aging curve, a slope corresponding to each of the charge change cycle accumulated values, wherein the slope is a ratio of the capacity difference value to the voltage difference value;设置模块,设置成根据所述斜率和所述老化曲线,设置比值与老化系数的对应关系。And a setting module configured to set a correspondence between the ratio and the aging coefficient according to the slope and the aging curve.
- 如权利要求11所述的装置,其中,所述典型曲线获取模块是设置成:The apparatus of claim 11 wherein said typical curve acquisition module is configured to:记录每个电池的各电量变化循环累加值和分别对应的老化系数信息;Recording the cumulative value of each power change cycle of each battery and the corresponding aging coefficient information;根据记录的信息,确定所有电池在每个相同的电量变化循环累加值处对应的老化系数范围;Determining, according to the recorded information, a range of aging coefficients corresponding to all of the batteries at each of the same charge change cycle accumulation values;从对应的老化系数范围中选择各相同的电量变化循环累加值分别对应的 典型老化系数;Selecting the same electric quantity change cycle accumulating value corresponding to each of the corresponding aging coefficient ranges Typical aging factor;根据各相同的电量变化循环累加值分别对应的典型老化系数确定典型的老化曲线。A typical aging curve is determined according to the typical aging coefficients corresponding to the respective cumulative values of the respective power change cycles.
- 如权利要求8-10中任意一项所述的装置,所述采样模块还设置成周期性采集所述待测电池的电量值;The apparatus according to any one of claims 8 to 10, wherein the sampling module is further configured to periodically collect the power value of the battery to be tested;所述老化确定模块是设置成:根据采集的电量值,确定所述待测电池当前的电量变化循环累;获取所述待测电池当前的电量变化循环累加值对应的老化系数范围;根据预设的比值与老化系数的对应关系,在所述当前的电量变化循环累加值对应的老化系数范围内,获取与确定的比值对应的老化系数。The aging determination module is configured to: determine, according to the collected electric quantity value, a current electric quantity change cycle of the battery to be tested; and obtain an aging coefficient range corresponding to a current accumulated electric energy change cycle cumulative value of the battery to be tested; The corresponding relationship between the ratio and the aging coefficient is obtained within the range of the aging coefficient corresponding to the current accumulated value of the electric quantity change cycle, and the aging coefficient corresponding to the determined ratio is obtained.
- 如权利要求13所述的装置,其中,所述老化确定模块是设置成:加载前次获取待测电池的老化系数范围时对应的电量变化循环累加值;The device according to claim 13, wherein the aging determination module is configured to: load a corresponding power change cycle cumulative value when the aging coefficient range of the battery to be tested is acquired last time;根据采集的电量值,确定电量变化循环累加值;Determining the accumulated value of the power change cycle according to the collected power value;当确定的电量变化循环累加值相对于加载的电量变化循环累加值增加设定计算阈值时,将确定的电量变化循环累加值确定为当前的电量变化循环累。When the determined power change cycle cumulative value is increased relative to the loaded power change cycle cumulative value increase setting calculation threshold value, the determined power change cycle cumulative value is determined as the current power change cycle tired.
- 一种计算机可读存储介质,存储有计算机可执行指令,所述计算机可执行指令被处理器执行时实现权利要求1所述的电池健康状态检测方法。 A computer readable storage medium storing computer executable instructions that, when executed by a processor, implement the battery health state detection method of claim 1.
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