CN109669138B - Method for accurately measuring residual capacity of power lead storage battery pack - Google Patents
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Abstract
The invention discloses a method for accurately measuring the residual capacity of a power lead storage battery, which comprises the following steps: using open circuit voltage and capacityFunctional relationship, calculating initial capacity SOC0(ii) a Calculating the residual capacity SOC of the battery pack during dynamic operation by adopting an ampere-hour methodA(ii) a Correcting SOC through relation curve of voltage, current and residual capacity and nominal capacity correctionA. Aiming at the problems that the residual capacity measured by an ampere-hour method has no initial capacity algorithm and the residual capacity is inaccurate due to errors accumulated in a day and a month, the residual capacity of the power lead storage battery pack is corrected, a corresponding correction function is obtained through the relation curve of voltage, current and the residual capacity and the nominal capacity correction in a fitting mode, the correction function not only considers the relation of the voltage, the current and the residual capacity, but also corrects the residual capacity by using the nominal capacity, and the error between the corrected residual capacity and the actual residual capacity is within 3%.
Description
Technical Field
The invention relates to the technical field of power lead storage batteries, in particular to a method for accurately measuring the residual capacity of a power lead storage battery pack.
Background
The lead accumulator is a widely used chemical power source, and has the advantages of good reversibility, stable voltage characteristic, long service life, wide application range, abundant raw materials, renewable use, low cost and the like. In recent years, with the growing awareness of environmental protection and the growing energy problem, lead storage batteries have played an extremely important role as a power source in electric vehicle systems.
At present, the electric vehicle can only display the electric quantity of the battery, the electric quantity display meter of the electric vehicle is only directly indicated by the voltage of the battery, the error is very large, the electric vehicle is a big pain point of an electric vehicle user, the judgment of the user on the remaining continuous mileage of the electric vehicle is influenced, more than 50% of electric quantity is displayed in an electric vehicle instrument panel, but the electric vehicle is started without sufficient electric quantity, or the electric vehicle is not started soon. Therefore, it is necessary to accurately predict the remaining capacity of the battery of the electric vehicle.
The conventional method for detecting the remaining battery capacity (SOC) is as follows: ampere-hour integration method, discharge test method, open circuit voltage method, internal resistance method, etc. The ampere-hour integration method, that is, the Ah method, also called ampere-hour method or electric quantity accumulation method, measures the capacity Q of the storage battery in units of Ah, and obtains a relatively accurate electric quantity value by integrating the charge and discharge current with time. The discharge test method is to carry out continuous discharge test on the load resistor, and in the discharge process, the size of the load resistor is adjusted to maintain the discharge current constant until the discharge termination voltage. The open circuit voltage method, also called OCV method, relates to the electromotive force of the battery, and according to the electrochemical theory, when the conversion of chemical energy and electric energy in the battery reaches equilibrium, the difference between the potential of the positive balance electrode and the potential of the negative balance electrode becomes the battery electromotive force, which is numerically equal to the open circuit voltage when the battery reaches a steady state.
In the above method, the open-circuit voltage method is the simplest method, and the discharge state of the battery can be estimated by only detecting the open-circuit voltage of the battery, but the method requires that the detected voltage must be the steady-state voltage when the battery is unloaded, and can only be measured when the battery is static, that is, the method cannot be used for SOC detection when the battery is in the charge and discharge states. The ampere-hour method mainly researches the external characteristics of the system, is easy to realize and wide in application, and is used for measuring the charge and discharge energy of the battery in real time.
However, the ampere-hour integral method still has the following problems in estimating the remaining capacity: (1) the method itself cannot estimate SOC0(ii) a (2) Coulombic efficiency is difficult to measure accurately; (3) the estimation error of the SOC under the non-normal temperature state is large.
Therefore, researchers have made a lot of studies on the correction of ampere-hour integration, such as: the Cao Shahua (based on an ampere-hour method online battery residual capacity correction algorithm, 2017) takes a single valve-regulated lead storage battery (VRLA) as a research object, and provides a correction method for improving the calculation accuracy of the battery residual capacity on the basis of the ampere-hour method and a working voltage conversion residual capacity algorithm in order to solve the problem of real-time dynamic estimation of the residual capacity (SOC) of the battery in an online working state; the estimation method has the advantages that the estimation of the residual capacity of the battery based on the working voltage of the battery is utilized, the estimation result is utilized to correct the initial capacity of the ampere-hour method and the residual capacity of the deep discharge later stage, and the estimation precision of the ampere-hour method is improved.
However, the accuracy of the above method for estimating the remaining capacity of the lead storage battery is still to be further improved.
Disclosure of Invention
The invention provides a method for accurately measuring the residual capacity of a power lead storage battery based on the problems of an ampere-hour integration method in the prior art, and the method is characterized in that an initial residual capacity algorithm is added on the basis of the ampere-hour integration method, the residual capacity after multiple charging and discharging is corrected, the estimation accuracy of the residual capacity of the lead storage battery is improved, and the error between the predicted residual capacity of the battery and the actual capacity is within 3%.
The specific technical scheme is as follows:
a method for accurately measuring the residual capacity of a power lead storage battery pack comprises the following steps:
(1) obtaining a function relation between the open-circuit voltage and the capacity of the power lead storage battery pack by using an open-circuit voltage method, measuring the open-circuit voltage of the power lead storage battery pack before operation, and obtaining the initial capacity SOC according to the function relation0；
(2) Based on the initial capacity SOC measured in the step (1)0Calculating the residual capacity SOC of the power lead storage battery pack in operation by adopting an ampere-hour methodA；
(3) Selecting one of the following steps (a) to (c) and setting the remaining capacity SOC in the step (2)ACorrecting;
(a) when the load voltage of a single power lead storage battery is larger than 11.3V, correcting the power lead storage battery in the discharging process;
correctionThe formula is as follows: corrected remaining capacity
Wherein I is working current, and t is working time;
(b) when the load voltage of a single power lead storage battery is larger than 11.3V, correcting the power lead storage battery in the charging process;
the correction formula is as follows: corrected remaining capacity
(c) When the load voltage of a single power lead storage battery is less than or equal to 11.3V, discharging the power lead storage battery pack by adopting different current gradients, obtaining a plurality of relation curves of current, voltage and residual capacity, forming a relation curved surface of the current, the voltage and the residual capacity, obtaining the relation of the residual capacity, the voltage and the current after fitting the curved surface, and correcting by combining with the nominal capacity to obtain the following functional relation:
SOC＝{[a×(I1/C)+b](V/n)2-[c×(I1/C)+d](V/n)+(e×(I1/C)+f)}％×C；
wherein a, b, c, d, e and f are function coefficients, I1For the discharge current value, C is the nominal capacity value of the power lead storage battery pack, and V is at I1And (4) corresponding to the load voltage value under the discharge current condition, wherein n is the number of the batteries of the power lead storage battery pack.
Aiming at the problems that the residual capacity measured by the ampere-hour method has no initial capacity or the initial capacity is inaccurate and the measurement of a low-capacity battery after continuous charging and discharging is inaccurate, the ampere-hour method is corrected, the initial capacity is measured by an open-circuit voltage method, a corresponding correction function is obtained through fitting a relation curve of voltage, current and the residual capacity and nominal capacity correction, the correction function not only considers the initial capacity and the relation of the voltage, the current and the residual capacity, but also corrects by utilizing the nominal capacity, and the error between the corrected residual capacity and the actual residual capacity is within 3 percent.
Considering that the capacity actually used in the discharging process is discharged by the battery pack according to 100%, while in the charging process, the capacity actually discharged by the battery pack is only 95% -98% of the actual charging capacity, and the accumulated error of each time is relatively large after each day and month. Therefore, the correction is performed by using the steps (a) and (b).
The above-described method for measuring the residual capacity according to the present invention is particularly suitable for a battery for an electric bicycle, for example: 6-DZF-12 type storage battery and 6-DZF-20 type storage battery.
Further, in the step (1), the function relationship is: SOC0＝[a’×(V0/n)2-b’×(V0/n)+c’]％*C；
Wherein a ', b ', c ' are function coefficients, V0And n is the open-circuit voltage, n is the number of the batteries of the power lead storage battery pack, and C is the capacity nominal value of the power lead storage battery pack.
For the 6-DZF-12 type battery and the 6-DZF-20 type battery, the function relation is as follows: SOC0＝(8.4491×(V0/n)2-159.23×(V0N) + 727.3)%) C; wherein, V0And n is the open-circuit voltage, n is the number of the batteries of the power lead storage battery pack, and C is the capacity nominal value of the power lead storage battery pack.
Further, in the step (2), the ampere-hour method adopts a formula as follows:
further, when the power lead storage battery pack is a 6-DZF-12 storage battery, the relation among the residual capacity, the voltage and the current in the step (c) is as follows: SOC { [ -1.451 × (I)1/C)+17.894](V/n)2-[-36.751×(I1/C)+379.86](V/n)+(-226.2×(I1/C)+2016.3)}％×C；
Wherein, I1For the discharge current value, C is the nominal capacity value of the power lead storage battery pack, and V is at I1And (4) corresponding to the load voltage value under the discharge current condition, wherein n is the number of the batteries of the power lead storage battery pack.
The above relation is particularly suitable for 6-DZF-12 type batteries, the residual capacity of the batteries can be measured by adopting the above formula, and the power lead storage battery pack is preferably a 4812 battery.
Further, when the power lead storage battery is a 6-DZF-20 type storage battery, the relation among the residual capacity, the voltage and the current in the step (c) is as follows: SOC { [0.907 × (I)1/C)+18.226](V/n)2-[6.6672×(I1/C)+394.76](V/n)+(-30.747×(I1/C)+2137.1)}％×C；
Wherein, I1For the discharge current value, C is the nominal capacity value of the power lead storage battery pack, and V is at I1And (4) corresponding to the load voltage value under the discharge current condition, wherein n is the number of the batteries of the power lead storage battery pack.
The above relation is particularly suitable for 6-DZF-20 type batteries, the residual capacity of the batteries can be measured by adopting the above formula, and the power lead storage battery pack is preferably a 4820 battery.
In addition to the above correction, the present invention also considers the problem of self-discharge of the storage battery, and in order to eliminate the influence of self-discharge on the remaining capacity of the storage battery, further, in step (3), the present invention further includes step (d):
(d) if the power lead storage battery pack is placed in a state of not charging and discharging, the residual capacity of the power lead storage battery pack is deducted according to the capacity value of 0.3-0.5% C/day.
Compared with the prior art, the invention has the following beneficial effects:
(1) aiming at the problems that the residual capacity measured by an ampere-hour method has no initial capacity algorithm and the residual capacity is inaccurate due to errors accumulated in a day and a month, the residual capacity of the power lead storage battery pack is corrected, a corresponding correction function is obtained through the relation curve of voltage, current and the residual capacity and the nominal capacity correction in a fitting mode, the correction function not only considers the relation of the voltage, the current and the residual capacity, but also corrects the residual capacity by using the nominal capacity, and the error between the corrected residual capacity and the actual residual capacity is within 3%.
(2) The invention also considers the self-discharge problem of the storage battery, and further improves the error between the corrected residual capacity and the actual residual capacity.
Drawings
Fig. 1 is a SOC measurement chart of a 48V 12Ah battery obtained by calculation using the methods of example 1, comparative example 1, and comparative example 2.
Fig. 2 is a SOC measurement chart of a 48V 20Ah battery obtained by calculation using the methods of example 2, comparative example 3, and comparative example 4.
Fig. 3 is a SOC test chart of self-discharge of the battery in the method and the actual SOC using example 3 and comparative example 5.
Detailed Description
Example 14812 Battery
(1) Taking 1 group of batteries with 48V and 12Ah, measuring the open-circuit voltage of the power lead storage battery pack, and obtaining the linear function relation between the open-circuit voltage and the capacity of the power lead storage battery pack;
the functional relationship is as follows: SOC [ (8.4491 ═ V)0/n)*(V0/n)-159.23*(V0/n)+727.3)/100]C; wherein, V0The open-circuit voltage is n, n is the number of the batteries of the power lead storage battery pack, n is 4, and C is the capacity nominal value of the power lead storage battery pack.
Before the power lead storage battery pack operates, the open-circuit voltage of the power lead storage battery pack is measured, and the SOC of the power lead storage battery pack is obtained according to the functional relation0；
(2) Charging and discharging the power lead storage battery pack, and calculating the residual capacity SOC of the power lead storage battery pack by using an ampere-hour methodA；
(3) For the residual capacity SOC in the step (2)ACorrecting;
the specific correction method is as follows:
(a) when the load voltage of a single power lead storage battery is larger than 11.3V, correcting the power lead storage battery in the discharging process;
the correction formula is as follows: corrected remaining capacity
Wherein I is working current, and t is working time;
(b) when the load voltage of a single power lead storage battery is larger than 11.3V, correcting the power lead storage battery in the charging process;
the correction formula is as follows: corrected remaining capacity
(c) When the load voltage of a single power lead storage battery is less than or equal to 11.3V, discharging the power lead storage battery by adopting different current gradients to obtain a plurality of relation curves of current, voltage and residual capacity to form a relation curved surface of the current, the voltage and the residual capacity, and fitting the curved surface to obtain the relation of the residual capacity, the voltage and the current;
however, when the 4812 battery with a load voltage less than or equal to 11.3V is used under different current conditions, the voltage and electric quantity corresponding curve has a certain relationship, but is more complex. If the judgment is only based on the voltage, the error is very large.
Therefore, in combination with the nominal capacity correction, the following functional relationship is obtained:
SOC＝{[-1.451×(I1/C)+17.894](V/n)2-[-36.751×(I1/C)+379.86](V/n)+(-226.2×(I1/C)+2016.3)}％×C；
wherein, I1For the discharge current value, C is the nominal capacity value of the power lead storage battery pack, and V is at I1The load voltage value under the corresponding discharge current condition, and n is the number of batteries of the power lead storage battery pack;
(d) when the battery was left without being charged and discharged, the remaining capacity of the battery was deducted by a capacity value of 0.5% C/day.
Comparative example 1
This comparative example was identical to example 1 except that the steps (a) to (c) were not modified.
Comparative example 2
This comparative example was identical to example 1 except that the modification of step (c) was not performed.
To power lead accumulator batteryRemaining capacity SOC obtained by performing continuous charge and discharge and performing continuous correction according to the algorithm provided in example 1 and comparative examples 1 and 2AThe results are shown in table 1 and fig. 1, compared to the actual SOC of the power lead battery pack.
TABLE 1
As can be seen from fig. 1 and table 1, the SOC of the power lead-acid battery pack is calculated only by referring to the ampere-hour method, firstly, the initial capacity cannot be measured or the measured SOC has related data only after passing through the charge and discharge process, secondly, after the ampere-hour method (i.e., comparative example 1) passes through dozens of charge and discharge cycles, the SOC is calculated accurately for the first ten times, but the deviation is larger and larger due to the accumulated error accumulated in the day and month, and the SOC corrected by adding the step (a) and the step (b) is relatively accurate; however, the SOC with the charge and discharge correction (i.e. comparative example 2) is subjected to dozens of cycles, the error in the later period is larger and larger, no accumulated error exists only through the fitting curve correction in the low-capacity state, the SOC is corrected when the low-capacity state occurs once, and the error of the SOC curve with the low-capacity correction (i.e. example 1) is within 3% compared with the actual SOC curve, for example, the maximum capacity error is only 0.33Ah calculated according to the nominal capacity of the 6-DZF-12 battery.
Example 24820 Battery
(1) Taking 1 group of batteries with 48V and 20Ah, measuring the open-circuit voltage of the power lead storage battery pack, and obtaining the linear function relation between the open-circuit voltage and the capacity of the power lead storage battery pack;
the functional relationship is as follows: SOC [ (8.4491 ═ V)0/n)*(V0/n)-159.23*(V0/n)+727.3)/100]C; wherein, V0The open-circuit voltage is n, n is the number of the batteries of the power lead storage battery pack, n is 4, and C is the capacity nominal value of the power lead storage battery pack.
Under the powerBefore the lead storage battery pack runs, the open-circuit voltage of the power lead storage battery pack is measured, and the SOC of the power lead storage battery pack is obtained according to the functional relation0；
(2) Charging and discharging the power lead storage battery pack, and calculating the residual capacity SOC of the power lead storage battery pack by using an ampere-hour methodA；
(3) For the residual capacity SOC in the step (2)ACorrecting;
the specific correction method is as follows:
(a) when the load voltage of a single power lead storage battery is larger than 11.3V, correcting the power lead storage battery in the discharging process;
the correction formula is as follows: corrected remaining capacity
Wherein I is working current, and t is working time;
(b) when the load voltage of a single power lead storage battery is larger than 11.3V, correcting the power lead storage battery in the charging process;
the correction formula is as follows: corrected remaining capacity
(c) When the load voltage of a single power lead storage battery is less than or equal to 11.3V, discharging the power lead storage battery by adopting different current gradients to obtain a plurality of relation curves of current, voltage and residual capacity to form a relation curved surface of the current, the voltage and the residual capacity, and fitting the curved surface to obtain the relation of the residual capacity, the voltage and the current; in combination with the nominal capacity correction, the following functional relationship is obtained:
SOC＝{[0.907×(I1/C)+18.226](V/n)2-[6.6672×(I1/C)+394.76](V/n)+(-30.747×(I1/C)+2137.1)}％×C；
wherein, I1For the discharge current value, C is the nominal capacity value of the power lead storage battery pack, and V is at I1Load under corresponding discharge current conditionThe voltage value n is the number of the batteries of the power lead storage battery pack;
(d) if the power lead storage battery pack is placed in a state of not charging and discharging, the residual capacity of the power lead storage battery pack is deducted according to the capacity value of 0.5 percent C/day.
Comparative example 3
This comparative example was identical to example 1 except that the steps (a) to (c) were not modified.
Comparative example 4
This comparative example was identical to example 1 except that the modification of step (c) was not performed.
The remaining capacity SOC obtained by continuously charging and discharging the power lead storage battery, continuously correcting according to the algorithm provided in example 1 and comparative examples 1 and 2AThe results are shown in table 2 and fig. 2, compared to the actual SOC of the power lead battery pack.
TABLE 2
As can be seen from fig. 2 and table 2, the SOC of the power lead-acid battery pack is calculated only by referring to the ampere-hour method, firstly, the initial capacity cannot be measured or the measured SOC has related data only after passing through the charge and discharge process, secondly, after the ampere-hour method (i.e., comparative example 3) passes through dozens of charge and discharge cycles, the SOC is calculated accurately for the first ten times, but the deviation is larger and larger due to the accumulated error accumulated in the day and month, and the SOC corrected by adding the step (a) and the step (b) is relatively accurate; however, the SOC with the charge and discharge correction (i.e. comparative example 4) is subjected to dozens of cycles, the error in the later period is larger and larger, no accumulated error exists only through the fitting curve correction in the low-capacity state, the SOC is corrected when the low-capacity state occurs once, and the error of the SOC curve with the low-capacity correction (i.e. example 2) is within 3% compared with the actual SOC curve, for example, the maximum capacity error is only 0.50Ah calculated according to the nominal capacity of the 6-DZF-20 battery.
As can be seen from examples 1 and 2, as long as the open-circuit voltage of the power lead-acid battery pack is measured, the initial capacity SOC of the power lead-acid battery pack can be calculated according to the function relationship between the open-circuit voltage and the capacity of the power lead-acid battery pack0In contrast, comparative examples 1 and 3, SOC was obtained after one charge and discharge process as measured by the ampere hour method0It cannot be measured in real time. The data in Table 1 are based only on the measured actual SOC of the battery as the SOC of comparative examples 1 and 30。
Example 3
(1) Taking 1 group of power lead storage battery packs with 48V and 12Ah, measuring the actual SOC of the power lead storage battery packs,
(2) the power lead-acid battery was subjected to a self-discharge test for 7 days, and the test was performed once every 7 days, and in example 4, the remaining capacity of the power lead-acid battery was subtracted from the capacity value of 0.3% C/day, and the remaining capacity SOC of the power lead-acid battery was calculated by self-dischargeA；
Comparative example 5
This comparative example was the same as example 3 except that the self-discharge correction was not performed.
TABLE 3
| Numbering | Self discharge test | Comparative example 5 | Example 3 | Battery embodiment sOC |
| SOC0 | 11.5 | 11.5 | 11.5 | |
| SOC1 | Standing for 7 days | 11.5 | 11.44 | 11.48 |
| SOC2 | Standing for 7 days | 11.5 | 11.38 | 11.46 |
| SOC3 | Standing for 7 days | 11.5 | 11.32 | 11.43 |
| SOC4 | Standing for 7 days | 11.5 | 11.26 | 11.39 |
| SOC5 | Standing for 7 days | 11.5 | 11.2 | 11.35 |
| SOC6 | Standing for 7 days | 11.5 | 11.14 | 11.30 |
| SOC7 | Standing for 7 days | 11.5 | 11.08 | 11.24 |
| SOC8 | Standing for 7 days | 11.5 | 11.02 | 11.17 |
| SOC9 | Standing for 7 days | 11.5 | 10.96 | 11.08 |
| SOC10 | Standing for 7 days | 11.5 | 10.9 | 10.98 |
| SOC11 | Standing for 7 days | 11.5 | 10.84 | 10.86 |
| SOC12 | Standing for 7 days | 11.5 | 10.78 | 10.71 |
As can be seen from table 3 and fig. 3, in the process of measuring and calculating the SOC of the battery, the SOC needs to be corrected by self-discharging of the battery, otherwise the SOC error becomes larger and larger, and the SOC corrected by self-discharging is relatively close to the actual SOC of the battery.
Claims (9)
1. A method for accurately measuring the residual capacity of a power lead storage battery pack is characterized by comprising the following steps:
(1) obtaining a function relation between the open-circuit voltage and the capacity of the power lead storage battery pack by using an open-circuit voltage method, measuring the open-circuit voltage of the power lead storage battery pack before operation, and obtaining the initial capacity SOC according to the function relation0；
(2) Based on the initial capacity SOC measured in the step (1)0Calculating the residual capacity SOC of the power lead storage battery pack in operation by adopting an ampere-hour methodA；
(3) Selecting one of the following steps (a) to (c) and setting the remaining capacity SOC in the step (2)ACorrecting;
(a) when the load voltage of a single power lead storage battery is larger than 11.3V, correcting the power lead storage battery in the discharging process;
the correction formula is as follows: corrected remaining capacity
Wherein I is working current, and t is working time;
(b) when the load voltage of a single power lead storage battery is larger than 11.3V, correcting the power lead storage battery in the charging process;
the correction formula is as follows: corrected remaining capacity
(c) When the load voltage of a single power lead storage battery is less than or equal to 11.3V, discharging the power lead storage battery pack by adopting different current gradients, obtaining a plurality of relation curves of current, voltage and residual capacity, forming a relation curved surface of the current, the voltage and the residual capacity, obtaining the relation of the residual capacity, the voltage and the current after fitting the curved surface, and correcting by combining with the nominal capacity to obtain the following functional relation:
SOC＝{[a×(I1/C)+b](V/n)2-[c×(I1/C)+d](V/n)+(e×(I1/C)+f)}％×C；
wherein a, b, c, d, e and f are function coefficients, I1For the discharge current value, C is the nominal capacity value of the power lead storage battery pack, and V is at I1And (4) corresponding to the load voltage value under the discharge current condition, wherein n is the number of the batteries of the power lead storage battery pack.
2. The method for accurately determining the residual capacity of a power lead storage battery pack according to claim 1, wherein in the step (1), the function relationship is as follows: SOC0＝[a’×(V0/n)2-b’×(V0/n)+c’]％*C；
Wherein a ', b ', c ' are function coefficients, V0And n is the open-circuit voltage, n is the number of the batteries of the power lead storage battery pack, and C is the capacity nominal value of the power lead storage battery pack.
3. The method for accurately determining the remaining capacity of a power lead-acid battery pack according to claim 2, wherein the functional relationship is as follows for a 6-d zf-12 type battery and a 6-d zf-20 type battery: SOC0＝(8.4491×(V0/n)2-159.23×(V0N) + 727.3)%) C; wherein, V0For open-circuit voltage, n is battery of power lead storage batteryAnd C is the capacity nominal value of the power lead storage battery pack.
4. The method for accurately measuring the residual capacity of the power lead-acid battery pack according to claim 1, wherein in the step (2), the ampere-hour method adopts the formula as follows:
5. the method for accurately determining the remaining capacity of a power lead storage battery pack according to claim 1, wherein when the power lead storage battery pack is a 6-d zf-12 type battery;
the relation among the residual capacity, the voltage and the current in the step (c) is as follows: SOC { [ -1.451 × (I)1/C)+17.894](V/n)2-[-36.751×(I1/C)+379.86](V/n)+(-226.2×(I1/C)+2016.3)}％×C；
Wherein, I1For the discharge current value, C is the nominal capacity value of the power lead storage battery pack, and V is at I1And (4) corresponding to the load voltage value under the discharge current condition, wherein n is the number of the batteries of the power lead storage battery pack.
6. The method for accurately determining the residual capacity of a power lead storage battery pack according to claim 5, wherein the power lead storage battery pack is a 4812 battery.
7. The method for accurately determining the residual capacity of a power lead storage battery pack according to claim 1, wherein when the power lead storage battery pack is a 6-DZF-20 type battery;
the relation among the residual capacity, the voltage and the current in the step (c) is as follows: SOC { [0.907 × (I)1/C)+18.226](V/n)2-[6.6672×(I1/C)+394.76](V/n)+(-30.747×(I1/C)+2137.1)}％×C；
Wherein, I1For the discharge current value, C is the nominal capacity value of the power lead storage battery pack, and V is at I1Corresponding discharge current barAnd the load voltage value under the condition, wherein n is the number of the batteries of the power lead storage battery pack.
8. The method for accurately determining the residual capacity of a power lead storage battery pack according to claim 7, wherein the power lead storage battery pack is a 4820 battery.
9. The method for accurately measuring the residual capacity of the power lead storage battery pack according to claim 1, wherein the step (3) further comprises the step (d):
(d) if the power lead storage battery pack is placed in a state without charging and discharging, the residual capacity of the power lead storage battery pack is deducted according to the capacity value of (0.3% -0.5%) C/day.
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| CN105759213A (en) * | 2016-02-16 | 2016-07-13 | 浙江安美科技有限公司 | Method for measuring storage battery residual capacity SOC |
| CN105807230B (en) * | 2016-03-11 | 2019-03-26 | 郑贵林 | Remaining battery capacity and health status rapid detection method and device |
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| CN108663621B (en) * | 2017-03-29 | 2020-06-19 | 比亚迪股份有限公司 | Charge state calculation method and system for power battery pack |
| CN109061521B (en) * | 2018-10-30 | 2021-03-16 | 四川长虹电源有限责任公司 | Storage battery pack charge state calculation method and system |
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