CN110794314A - Method for improving lithium ion battery capacity test accuracy - Google Patents
Method for improving lithium ion battery capacity test accuracy Download PDFInfo
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- CN110794314A CN110794314A CN201911115076.8A CN201911115076A CN110794314A CN 110794314 A CN110794314 A CN 110794314A CN 201911115076 A CN201911115076 A CN 201911115076A CN 110794314 A CN110794314 A CN 110794314A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/385—Arrangements for measuring battery or accumulator variables
- G01R31/387—Determining ampere-hour charge capacity or 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]
- G01R31/367—Software therefor, e.g. for battery testing using modelling or look-up tables
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Abstract
The invention relates to the technical field of lithium ion batteries, and discloses a method for improving the capacity test accuracy of a lithium ion battery, which comprises the following steps: 1) charging the lithium ion battery to a full state; 2) laying the charged lithium ion battery; 3) carrying out step discharge of large and small current combinations on the shelved lithium ion battery under the condition that the environmental temperature is T, and measuring the discharge capacity of each stage; 4) the mathematical model of the total discharge capacity C0 of the lithium ion battery based on the standard discharge current A is as follows: c0 ═ C1+ C2+ … … C (n) + C (n +1) × (a × T + b); 5) determining the determined values of the coefficient a and the constant b, and calculating the discharge capacity discharged according to the standard discharge current A in the batch production process through a mathematical model; a large amount of energy consumed by temperature control in the whole discharging process of the battery can be avoided, and the production cost of the product is greatly reduced; the production efficiency of the product is greatly improved; the accuracy of the lithium ion battery capacity test is improved.
Description
Technical Field
The invention relates to the technical field of lithium ion batteries, in particular to a method for improving the capacity test accuracy of a lithium ion battery.
Background
During the matching and using process of lithium ion batteries, the problem of the pressure difference of the battery pack is one of the common quality problems, and the inaccuracy of the single capacity test is one of the most common reasons for causing the pressure difference abnormality of the battery pack. There are two methods of industry for capacity testing: (1) fully charging the battery, discharging the battery to a cut-off voltage at a constant current strictly according to national standards or enterprise standards, and directly collecting the standard capacity of the battery; (2) fully charging the battery, adopting a large-current constant current to discharge to a cut-off voltage, collecting the discharge capacity and the ambient temperature of the battery during discharge, and then taking the capacity obtained after conversion of the discharge capacity as the standard capacity of the battery.
The first method strictly performs capacity test according to the standard, the accuracy of the capacity test is undoubted, but a large amount of equipment and energy consumption are required for improving the environmental temperature control, the discharge current is small, the discharge process needs more than 5 hours, the production efficiency is extremely low, and large-scale industrial production is not easy to realize. The second method is to moderately relax the environmental temperature control standard, but the standard capacity of the battery needs to be estimated after double conditions of multiplying power and temperature are converted through the discharge capacity, and the conversion introduction deviation is often very large.
Therefore, the conventional method for testing the capacity of the lithium ion battery has low production efficiency or poor measurement accuracy, and is lack of an efficient and accurate method for testing the capacity of the lithium ion battery.
Disclosure of Invention
The invention aims to provide a method for improving the lithium ion battery capacity test accuracy, and aims to solve the problem that an efficient and accurate lithium ion battery capacity test method is lacked in the prior art.
The invention is realized in this way, the method for improving the lithium ion battery capacity test accuracy is characterized by comprising the following steps:
1) charging the lithium ion battery to a full state;
2) placing the charged lithium ion battery;
3) carrying out step discharge of large and small current combinations on the shelved lithium ion battery under the condition that the environmental temperature is T, and measuring the discharge capacity of each stage; the discharge capacity under the discharge current of the 1 st stage is C1, the discharge capacity under the discharge current of the 2 nd stage is C2, the discharge capacity under the discharge current of the N th stage is C (N), and the discharge capacity of the standard discharge current A is C (N +1) under the condition that the environmental temperature is T in the last stage;
4) the lithium ion battery adopts a mathematical model of the total discharge capacity C0 of the standard discharge current A as follows: c0 ═ C1+ C2+ … … C (n) + C (n +1) × (a × T + b), a is the temperature-affected coefficient of the environmental temperature T to the last-stage discharge capacity C (n +1), and b is the correction coefficient;
5) ensuring that the battery design, material, structure and capacity test method are unchanged, testing the discharge capacity at each discharge stage at different environmental temperatures according to the discharge mode of the step 3), then determining the determination value of the coefficient a and the constant b by linear fitting of (C1+ C2+ … … + C (n) + C (n +1) -C0)/C (n +1) -T, and calculating the discharge capacity discharged according to the standard discharge current A in the batch production process through the mathematical model.
Further, the standard discharge current a in the step 3) is 0.2C.
Further, the discharge in the Nth stage in the step 3) is stopped until the voltage of the lithium ion battery reaches 2.5V or 2.75V.
Further, the last stage of discharging in the step 3) maintains the voltage of the lithium ion battery at 2.5V or 2.75V.
Further, the time of the final stage discharge in the step 3) is 30 minutes.
Further, the charging current in the step 1) is 0.5C.
Further, the lithium ion battery is charged to be fully charged when the voltage of the lithium ion battery is 4.2V.
Further, the off-current when the lithium ion battery is fully charged is 0.05C.
Further, the lithium ion battery is left for more than 10 minutes in the step 2).
Compared with the prior art, the method for improving the capacity test accuracy of the lithium ion battery has the following advantages:
1) the method can avoid a large amount of energy consumed by the temperature control of the whole discharging process of the battery by only correcting the discharging capacity influenced by the temperature in the last stage, thereby greatly reducing the production cost of the product;
2) the method realizes staged discharge by combining large-current discharge and small-current discharge, and further measures and calculates to obtain the total battery capacity, the large-current discharge can release higher lithium ion battery electric quantity in a shorter time, the residual lower electric quantity is released by the small-current discharge, and the required time is shorter, so the time of the whole battery capacity measuring process is short, and the production efficiency of the product is greatly improved;
3) the standard discharge capacity of the lithium ion battery under the standard discharge current A, namely the total battery capacity C0, is fixed and always is the sum of the discharge capacities in all stages, and the total battery capacity C0 obtained through final calculation can be ensured to be accurate through accurately measuring and calculating the discharge capacity C (n +1) discharged by the small current in the final stage, so that the situation that the estimated capacity is amplified to be far away from the standard capacity value after the tested capacity is converted due to the difference among individual batteries is avoided, and the accuracy of the lithium ion battery capacity test is improved.
Drawings
Fig. 1 is a schematic flow chart of the method for improving the accuracy of the lithium ion battery capacity test provided by the invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The following describes the implementation of the present invention in detail with reference to specific embodiments.
The same or similar reference numerals in the drawings of the embodiments correspond to the same or similar components; in the description of the present invention, it should be understood that if there is an orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", etc. based on the orientation or positional relationship shown in the drawings, it is only for convenience of describing the present invention and simplifying the description, but it is not intended to indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes and are not to be construed as limiting the present patent, and the specific meaning of the terms may be understood by those skilled in the art according to specific circumstances.
Referring to fig. 1, a preferred embodiment of the present invention is shown.
The method for improving the accuracy of the lithium ion battery capacity test provided in the embodiment can be applied to the lithium ion battery capacity measurement process, and certainly, can also be applied to the other battery capacity measurement processes, and is not limited to the application in the embodiment.
In the embodiment, the discharge current of each discharge stage before the final stage depends on any discharge current which can be borne by the product, and can be 0.2 to 100 ℃; and the discharge current value of the final stage is the same as the discharge current value and the discharge cut-off voltage specified by the national standard/enterprise standard/product specification.
Wherein C is the rated battery capacity of the lithium ion battery, and if C is 1000mAh, 0.2C of the standard discharge current a means 200 mA.
The charging current in step 1) according to the conditions specified by the national standard/enterprise standard/product specification can be 0.5C,
the charging current of 0.5C can ensure higher charging speed and prevent safety accidents in the measurement process of the lithium ion battery caused by overlarge charging current.
The capacity test mathematical model requires that the product design, materials, structure, production process and product capacity standard test method are kept unchanged to be effective, and once the factors change, the capacity calibration mathematical model needs to be established again.
The step discharge process combining large discharge current and small discharge current in the embodiment takes a two-step discharge process of discharging according to 0.2C low current after discharging large current as an optimal method, so that the rapid discharge can be realized through the large current discharge, the production efficiency is improved, the accurate measurement of the total battery capacity can be realized through the low current discharge, and the measurement accuracy is improved.
The temperature range applicable to the capacity test mathematical model in this embodiment cannot exceed the temperature range when the mathematical model is established for testing.
The first embodiment is as follows: the utility model provides a 26650 lithium ion battery, this lithium ion battery includes anodal nickel cobalt lithium manganate ternary material, negative pole graphite, hexafluorophosphorous lithium electrolyte, key materials such as diaphragm, steel casing, and the rationale is that anodal delithiation imbeds negative pole graphite during charging, and negative pole graphite is taken off and is imbedded lithium ion and get back to anodal material during discharge, improves this lithium ion battery capacity and marks accuracy method, includes the following step:
1) respectively standing 8pcs of batteries in a constant temperature environment of 25 ℃ for 30min, and then charging to 4.2V at a constant current and a constant voltage of 0.5C according to the requirements of product specification, and stopping current of 0.05C;
2) standing for 10min, discharging to 2.75V at standard discharge current of 0.2C specified by product specification, and marking discharge capacity as C0;
3) recharging the battery to 4.2V according to the method in the step 1, discharging to 2.75V at 1.0C after standing for 10min, marking the discharge capacity as C1, and then discharging to 2.75V at the standard discharge current, and marking the capacity as C2;
4) repeating the steps 1-3 to test the discharge capacities C0, C1 and C2 at 27 deg.C, 29 deg.C, 31 deg.C and 33 deg.C respectively;
5) the (C1+ C2-C0)/C2-T is used for fitting analysis, and the mathematical conversion model for the capacity test of the lithium ion battery of the model is as follows: c0 ═ C1+ C2-C2 ═ 0.1440T-3.464, T is more than or equal to 23 ℃ and less than or equal to 33 ℃;
6) the lithium ion battery batch production capacity test is completed according to the charging and discharging steps described in the following table 1, 1.0C discharge capacity C1 and 0.2C discharge capacity C2 and T are collected, the full-charge 4.2V of the battery is discharged according to 0.2C to 2.75V capacity C0 ═ C1+ C2-C2 (0.1440 × T-3.464), and T is more than or equal to 23 ℃ and less than or equal to 33 ℃.
Batch test charging and discharging process steps for capacity of table 126650
The second embodiment is as follows: the 18650 lithium ion battery, this lithium ion battery includes anodal nickel cobalt aluminium material, negative pole graphite, hexafluorophosphorus lithium electrolyte, key materials such as diaphragm, steel casing, and the rationale is that anodal lithium is taken off and is imbedded negative pole graphite during charging, negative pole graphite takes off and inlays lithium ion and get back to anodal material during discharging, improves this lithium ion battery capacity and marks the accuracy method, includes the following step:
1) respectively standing 8pcs of batteries in a constant temperature environment of 25 ℃ for 30min, and then charging to 4.2V at a constant current and a constant voltage of 0.5C according to the requirements of product specification, and stopping current of 0.05C;
2) standing for 10min, discharging to 2.5V at standard discharge current of 0.2C specified by product specification, and marking discharge capacity as C0;
3) recharging the battery to 4.2V according to the method in the step 1, discharging to 2.5V at 1.0C after standing for 10min, wherein the discharge capacity is marked as C1, and then discharging to 2.5V at standard discharge current, and the capacity is marked as C2;
4) repeating the steps 1-3 to test the discharge capacities C0, C1 and C2 at 27 deg.C, 29 deg.C, 31 deg.C and 33 deg.C respectively;
5) the (C1+ C2-C0)/C2-T is used for fitting analysis, and the mathematical conversion model for the capacity test of the lithium ion battery of the model is as follows: c0 ═ C1+ C2-C2 ═ 0.06475T-1.659, T ≤ 23 deg.C and ≤ 33 deg.C;
6) the lithium ion battery batch production capacity test is carried out according to the charging and discharging steps described in the following table 2, 1.0C discharge capacity C1 and 0.2C discharge capacity C2 and T are collected, the full-charge 4.2V of the battery is discharged according to 0.2C until 2.5V capacity C0 is equal to C1+ C2-C2 (0.1440 is equal to T-3.464), and T is equal to or higher than 23 ℃ and equal to or lower than 33 ℃.
Batch test charging and discharging process steps for capacity of table 218650
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (9)
1. The method for improving the capacity test accuracy of the lithium ion battery is characterized by comprising the following steps of:
1) charging the lithium ion battery to a full state;
2) placing the charged lithium ion battery;
3) carrying out step discharge of large and small current combinations on the shelved lithium ion battery under the condition that the environmental temperature is T, and measuring the discharge capacity of each stage; the discharge capacity under the discharge current of the 1 st stage is C1, the discharge capacity under the discharge current of the 2 nd stage is C2, the discharge capacity under the discharge current of the N th stage is C (N), and the discharge capacity of the standard discharge current A is C (N +1) under the condition that the environmental temperature is T in the last stage;
4) the lithium ion battery adopts a mathematical model of the total discharge capacity C0 of the standard discharge current A as follows: c0 ═ C1+ C2+ … … C (n) + C (n +1) × (a × T + b), a is the temperature-affected coefficient of the environmental temperature T to the last-stage discharge capacity C (n +1), and b is the correction coefficient;
5) ensuring that the battery design, material, structure and capacity test method are unchanged, testing the discharge capacity at each discharge stage at different environmental temperatures according to the discharge mode of the step 3), then determining the determination value of the coefficient a and the constant b by linear fitting of (C1+ C2+ … … + C (n) + C (n +1) -C0)/C (n +1) -T, and calculating the discharge capacity discharged according to the standard discharge current A in the batch production process through the mathematical model.
2. The method for improving the accuracy of the lithium ion battery capacity test according to claim 1, wherein the standard discharge current A in the step 3) is 0.2C.
3. The method for improving the accuracy of the lithium ion battery capacity test according to claim 2, wherein the discharging in the nth stage in the step 3) is stopped until the voltage of the lithium ion battery reaches 2.5V or 2.75V.
4. The method for improving the accuracy of the lithium ion battery capacity test according to claim 3, wherein the voltage of the lithium ion battery is maintained at 2.5V or 2.75V during the final stage of discharging in the step 3).
5. The method for improving the accuracy of the lithium ion battery capacity test according to claim 4, wherein the time for the final stage discharge in the step 3) is 30 minutes.
6. The method for improving the accuracy of the lithium ion battery capacity test according to any one of claims 1 to 5, wherein the charging current in the step 1) is 0.5C.
7. The method of claim 6, wherein the lithium ion battery is charged to a full charge when the voltage of the lithium ion battery is 4.2V.
8. The method according to claim 7, wherein the off-current when the lithium ion battery is fully charged is 0.05C.
9. The method for improving the accuracy of the lithium ion battery capacity test according to any one of claims 1 to 5, wherein the lithium ion battery is left for more than 10 minutes in the step 2).
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| CN111722120A (en) * | 2020-06-04 | 2020-09-29 | 国联汽车动力电池研究院有限责任公司 | Method and system for evaluating reversible lithium consumption of lithium ion battery |
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| CN112630672A (en) * | 2020-12-31 | 2021-04-09 | 湖北亿纬动力有限公司 | Method for correcting capacity of lithium battery and application thereof |
| CN114236397A (en) * | 2021-12-02 | 2022-03-25 | 红安力神动力电池系统有限公司 | Echelon lithium battery residual capacity testing method |
| CN116613864A (en) * | 2023-07-17 | 2023-08-18 | 安徽博诺思信息科技有限公司 | Online nuclear capacity inspection method and device for storage battery |
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| CN111257760A (en) * | 2020-05-06 | 2020-06-09 | 长沙德壹科技有限公司 | Storage battery capacity verification method and device |
| CN111624506A (en) * | 2020-06-01 | 2020-09-04 | 江西优特汽车技术有限公司 | Method for testing performance of power lithium ion battery at normal temperature |
| CN111722120A (en) * | 2020-06-04 | 2020-09-29 | 国联汽车动力电池研究院有限责任公司 | Method and system for evaluating reversible lithium consumption of lithium ion battery |
| CN112034367A (en) * | 2020-11-06 | 2020-12-04 | 瑞浦能源有限公司 | Lithium ion battery capacity prediction method and system |
| CN112034367B (en) * | 2020-11-06 | 2021-01-15 | 瑞浦能源有限公司 | Lithium ion battery capacity prediction method and system |
| CN112630672A (en) * | 2020-12-31 | 2021-04-09 | 湖北亿纬动力有限公司 | Method for correcting capacity of lithium battery and application thereof |
| CN112630672B (en) * | 2020-12-31 | 2023-10-03 | 湖北亿纬动力有限公司 | Lithium battery capacity correction method and application thereof |
| CN114236397A (en) * | 2021-12-02 | 2022-03-25 | 红安力神动力电池系统有限公司 | Echelon lithium battery residual capacity testing method |
| CN116613864A (en) * | 2023-07-17 | 2023-08-18 | 安徽博诺思信息科技有限公司 | Online nuclear capacity inspection method and device for storage battery |
| CN116613864B (en) * | 2023-07-17 | 2023-10-20 | 安徽博诺思信息科技有限公司 | Online nuclear capacity inspection method and device for storage battery |
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