CN109669143B - Battery pack capacity evaluation method - Google Patents
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- 238000007599 discharging Methods 0.000 abstract description 16
- 238000001514 detection method Methods 0.000 abstract description 2
- 239000000178 monomer Substances 0.000 description 9
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 8
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Abstract
本发明提供一种电池组容量评测方法，属于电池组质量检测技术领域。该电池组容量评测方法包括：将初始荷电量在设定范围内的待测电池组按照设定倍率放电至截止电压，确定放电过程中最低单体电压与放电时间的关系曲线以及最低单体电压与动态压差的关系曲线；将两曲线上共有的最大拐点对应的动态压差值作为第一特征电压点动态压差值，以放电截止处的动态压差值作为第二特征电压点动态压差值；将得到的两个特征电压点动态压差值与对应的动态压差合格标准值进行比较，若均没有超过对应的动态压差合格标准值，则说明该待测电池组容量合格。该电池组容量评测方法能够缩短评测时间，减少评测费用。
The invention provides a battery pack capacity evaluation method, which belongs to the technical field of battery pack quality detection. The battery pack capacity evaluation method includes: discharging the battery pack to be tested with an initial charge within a set range to a cut-off voltage according to a set rate, and determining the relationship curve between the lowest cell voltage and the discharge time and the lowest cell voltage during the discharge process. The relationship curve with the dynamic pressure difference; the dynamic pressure difference value corresponding to the maximum inflection point shared by the two curves is taken as the dynamic pressure difference value of the first characteristic voltage point, and the dynamic pressure difference value at the discharge cut-off point is taken as the dynamic pressure difference value of the second characteristic voltage point. Difference; compare the obtained dynamic pressure difference value at the two characteristic voltage points with the corresponding dynamic pressure difference qualified standard value. If neither exceeds the corresponding dynamic pressure difference qualified standard value, it means that the capacity of the battery pack to be tested is qualified. The battery pack capacity evaluation method can shorten the evaluation time and reduce the evaluation cost.
Description
Technical Field
The invention relates to a battery pack capacity evaluation method, and belongs to the technical field of battery pack quality detection.
Background
The existing battery pack capacity evaluation method is in a full-charge state when the battery is discharged, so that the battery pack needs to be fully charged before discharging, and the discharge capacity is the actual capacity of the battery pack, so that the time spent in the evaluation process is too long. Meanwhile, charging and discharging are required to be completed on power charging and discharging working condition equipment, and the cost of the power charging and discharging working condition equipment is high. Therefore, the existing battery capacity evaluation method takes long time and requires high cost.
Disclosure of Invention
The invention aims to provide a battery pack capacity evaluation method to solve the problems of long time and high cost of battery pack capacity evaluation at present.
In order to achieve the above object, the present invention provides a battery pack capacity evaluation method, including the steps of:
1) discharging the battery pack to be tested with the initial charge amount within a set range to cut-off voltage according to a set multiplying power, and determining a relation curve of the lowest monomer voltage and the discharge time and a relation curve of the lowest monomer voltage and the dynamic pressure difference in the discharge process;
2) taking the dynamic pressure difference value corresponding to the common maximum inflection point on the two curves as a first characteristic voltage point dynamic pressure difference value, and taking the dynamic pressure difference value at the discharge cutoff position as a second characteristic voltage point dynamic pressure difference value;
3) and comparing the obtained dynamic differential pressure values of the two characteristic voltage points with corresponding dynamic differential pressure qualified standard values, and if the two dynamic differential pressure values do not exceed the corresponding dynamic differential pressure qualified standard values, indicating that the capacity of the battery pack to be tested is qualified, wherein the dynamic differential pressure qualified standard values are determined according to the full-charge and full-discharge capacity evaluation data of the battery pack.
The battery pack capacity evaluation method has the beneficial effects that: the method is used for evaluating the capacity of the battery pack, and the battery pack is not required to be in a full-charge state when being discharged, so that the process of fully charging the battery pack is saved, and the evaluation time is shortened; in addition, special power charging and discharging working condition equipment is not needed, so that the cost is reduced.
In order to obtain a qualified standard value of the dynamic pressure difference so as to judge whether the capacity of the battery pack to be tested is qualified or not, as an improvement of the above battery pack capacity evaluation method, the obtaining process of the qualified standard value of the dynamic pressure difference is as follows:
A. extracting at least 100 sets of battery packs, and discharging to cut-off voltage according to a set multiplying power after each set of battery pack is fully charged;
B. acquiring a characteristic voltage point dynamic voltage difference value of each battery pack in a discharging process, wherein each group comprises a corresponding first characteristic voltage point dynamic voltage difference value and a corresponding second characteristic voltage point dynamic voltage difference value;
C. and calculating the average value of the dynamic voltage difference values of the first characteristic voltage point and the average value of the dynamic voltage difference values of the second characteristic voltage point in the obtained dynamic voltage difference values of the characteristic voltage points of each battery pack, and respectively taking the set proportion of each average value as the qualified standard value of the dynamic voltage difference of the first characteristic voltage point and the qualified standard value of the dynamic voltage difference of the second characteristic voltage point.
In order to make the obtained qualified standard value of the dynamic pressure difference more reasonable, the value range of the set proportion in the step C is 105-120 percent as another improvement of the battery pack capacity evaluation method.
In order to evaluate whether the capacity of the battery pack is qualified or not under the condition that the battery pack is not required to be fully charged so as to reduce the evaluation time, as a further improvement of the battery pack capacity evaluation method, the set range is 30% -70%.
Drawings
Fig. 1 is a flow chart of a battery capacity evaluation method according to an embodiment of the invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
The method for evaluating the capacity of the battery pack is described in detail below by taking a power lithium battery pack as an example. The power lithium battery pack is formed by selecting monomer cells meeting the capacity required by customers. After the power lithium battery pack is formed by connecting the single battery cells in series and in parallel, the pack capacity has a certain attenuation relative to the single capacity, so that the rated capacity of each single battery cell forming the power lithium battery pack needs to meet the customer requirements, and the calculation is carried out according to the standard that the rated capacity of the single battery cell is equal to the capacity of the power lithium battery pack multiplied by 102 percent when the rated capacity of the single battery cell is calculated.
Referring to fig. 1, the battery capacity evaluating method includes the steps of:
step 1: according to the discharge process test data of the battery pack to be tested, a corresponding relation curve of the discharge time and the lowest single voltage (namely, a relation curve of the lowest single voltage and the discharge time) and a corresponding relation curve of the lowest single voltage and the dynamic pressure difference (namely, a relation curve of the lowest single voltage and the dynamic pressure difference) are determined.
In this embodiment, the battery pack to be tested, the initial charge of which is within the range of 30% SOC to 70% SOC (i.e., within the set range), is discharged to the cut-off voltage according to the 1C magnification (i.e., the set magnification), the discharging process may be performed on the battery rack, the voltage value of each single battery cell in the discharging process of the battery pack to be tested is collected by the battery management group, and the maximum value and the minimum value among the voltage values of all the single battery cells in the discharging process of the battery pack to be tested are calculated. Wherein, the minimum value is used as the lowest monomer voltage, and the difference between the maximum value and the minimum value is used as the dynamic pressure difference. Drawing a scatter diagram of the lowest monomer voltage and the discharge time by using an EXCEL tool, determining a corresponding relation curve (marked as a T-Vmin curve) of the discharge time and the lowest monomer voltage, drawing a scatter diagram of the dynamic pressure difference and the lowest monomer voltage, and determining a corresponding relation curve (marked as a Vmin-DVDiff curve) of the lowest monomer voltage and the dynamic pressure difference.
In other embodiments, the setting range of the initial charge of the battery pack to be tested, the setting magnification during discharging, and the cut-off voltage can be adjusted according to actual conditions.
Step 2: and determining the characteristic voltage point dynamic pressure difference values (including a first characteristic voltage point dynamic pressure difference value and a second characteristic voltage point dynamic pressure difference value) according to the slopes and slope change rates of the T-Vmin curve and the Vmin-DVDiff curve.
In the discharging process, when the charge capacity of the battery pack to be tested is in a 10% SOC-0% SOC interval, the voltage of each monomer battery core is rapidly reduced, a very obvious inflection point is formed on a T-Vmin curve, and the slope of the T-Vmin curve is rapidly increased. Meanwhile, because the rapid reduction rates of the cell voltages of the single cells are not consistent, an obvious inflection point is also formed on the Vmin-DVDiff curve. In this embodiment, the voltage value at the common maximum inflection point on the two curves is used as the first characteristic voltage point, and the dynamic voltage difference value corresponding to the common maximum inflection point on the two curves is used as the first characteristic voltage point dynamic voltage difference value (i.e., the dynamic voltage difference value corresponding to the first characteristic voltage point).
As the depth of discharge continues to increase, the slope of the two curves continues to increase until the discharge cutoff voltage. In this embodiment, the voltage value at the discharge cutoff point is used as the second characteristic voltage point, and the dynamic voltage difference value at the discharge cutoff point is used as the second characteristic voltage point dynamic voltage difference value (i.e., the dynamic voltage difference value corresponding to the second characteristic voltage point).
And step 3: and (3) formulating a characteristic voltage point dynamic differential pressure judgment standard (comprising a qualified standard value of the dynamic differential pressure of the first characteristic voltage point and a qualified standard value of the dynamic differential pressure of the second characteristic voltage point) by combining the full charge and full discharge capacity evaluation data of the power lithium battery pack.
In this embodiment, 100 sets of power lithium battery packs (hereinafter referred to as battery packs) are selected, and after each set of battery pack is fully charged, the battery packs are discharged to a cut-off voltage according to a 1C magnification (i.e., a set magnification).
And (3) acquiring a first characteristic voltage point dynamic voltage difference value and a second characteristic voltage point dynamic voltage difference value in the discharging process of each set of battery pack by utilizing the step (1) and the step (2) to obtain 100 sets of characteristic voltage point dynamic voltage difference values.
Calculating the average value of the dynamic voltage difference values of the first characteristic voltage point in the obtained 100 groups of dynamic voltage difference values of the characteristic voltage points, and taking 105 percent (namely a set proportion) of the average value as a qualified dynamic voltage difference standard value of the first characteristic voltage point; similarly, calculating the average value of the dynamic voltage difference values of the second characteristic voltage point in the obtained 100 groups of dynamic voltage difference values of the characteristic voltage point, and taking 105% of the average value as the qualified dynamic voltage difference standard value of the second characteristic voltage point respectively.
As another embodiment, when the dynamic differential pressure qualified standard value is determined, the set multiplying power when the battery pack is discharged and the set proportion of the dynamic differential pressure value average of the first and second characteristic voltage points may all be adjusted according to actual conditions, for example, the set proportion may be selected from a range of 105% to 120%.
As another embodiment, in order to make the obtained dynamic differential pressure qualified standard value more conform to the actual situation, more than 100 sets of evaluation data of the full charge and full discharge capacity of the power lithium battery pack may be selected as required to calculate the dynamic differential pressure qualified standard value.
And 4, step 4: and judging whether the capacity of the battery pack to be tested is qualified or not according to the characteristic voltage point dynamic pressure difference judgment standard.
And (3) comparing the first characteristic voltage point dynamic pressure difference value and the second characteristic voltage point dynamic pressure difference value of the battery pack to be tested obtained in the step (2) with corresponding dynamic pressure difference qualified standard values respectively, and if the first characteristic voltage point dynamic pressure difference value and the second characteristic voltage point dynamic pressure difference value do not exceed the corresponding dynamic pressure difference qualified standard values, indicating that the capacity of the battery pack to be tested is qualified.
In the embodiment, whether the capacity of the battery pack is qualified or not is evaluated according to the dynamic voltage difference value of the two characteristic voltage points in the discharging process of the battery pack, and the problems that the evaluation of the capacity of the battery pack takes long time and the required equipment and labor cost are high are solved.
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| CN110687457B (en) * | 2019-11-13 | 2021-12-03 | 东软睿驰汽车技术（沈阳）有限公司 | Battery pack abnormity detection method and device, storage medium and electronic equipment |
| CN111999671B (en) * | 2020-08-04 | 2023-01-10 | 中汽研汽车检验中心（天津）有限公司 | A calculation method for over-discharge excess capacity value of lithium-ion battery |
| CN115032551A (en) * | 2021-03-03 | 2022-09-09 | 北汽福田汽车股份有限公司 | A SOC value calibration method, device and vehicle |
| CN113281667A (en) * | 2021-05-14 | 2021-08-20 | 奇瑞商用车（安徽）有限公司 | Power battery pack capacity testing method |
| CN114137421B (en) * | 2021-11-30 | 2023-09-19 | 章鱼博士智能技术(上海)有限公司 | Battery abnormality detection method, device, equipment and storage medium |
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