CN111842222A - Lithium battery capacity grading capacity compensation method, storage medium and lithium battery capacity grading equipment - Google Patents
Lithium battery capacity grading capacity compensation method, storage medium and lithium battery capacity grading equipment Download PDFInfo
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- CN111842222A CN111842222A CN202010646629.9A CN202010646629A CN111842222A CN 111842222 A CN111842222 A CN 111842222A CN 202010646629 A CN202010646629 A CN 202010646629A CN 111842222 A CN111842222 A CN 111842222A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
- B07C—POSTAL SORTING; SORTING INDIVIDUAL ARTICLES, OR BULK MATERIAL FIT TO BE SORTED PIECE-MEAL, e.g. BY PICKING
- B07C5/00—Sorting according to a characteristic or feature of the articles or material being sorted, e.g. by control effected by devices which detect or measure such characteristic or feature; Sorting by manually actuated devices, e.g. switches
- B07C5/34—Sorting according to other particular properties
- B07C5/344—Sorting according to other particular properties according to electric or electromagnetic properties
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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Abstract
The invention discloses a lithium battery capacity grading capacity compensation method, a storage medium and lithium battery capacity grading equipment, wherein the lithium battery capacity grading capacity compensation method comprises the following steps: A. collecting the ambient temperature of the battery capacity grading; B. detecting the production capacity of the battery; C. reading corresponding compensation capacity according to the environment temperature and the production capacity, wherein the compensation capacity is the capacity at the specification temperature; D. adjusting the detected battery capacity to the compensation capacity. The invention can accurately classify the lithium battery.
Description
Technical Field
The invention relates to the technical field of lithium battery capacity grading, in particular to a lithium battery capacity grading capacity compensation method, a storage medium and lithium battery capacity grading equipment.
Background
The lithium battery has the advantages of high specific energy, low self-discharge rate, good high and low temperature performance, long charge and discharge life, no memory effect and the like, and is widely applied to products such as automobiles, notebook computers, video cameras, digital cameras, personal digital assistants, mobile communication terminal products, electric tools and the like. Many products require a plurality of single batteries to be connected in series or in parallel to form a battery pack for use, so as to achieve higher output voltage and capacity. The batteries in each batch have different performances such as capacity, internal resistance, self-discharge rate and the like in the process and the preparation process. Screening the single batteries with basically consistent performance is a key link for forming the battery pack, wherein the screening of the capacity of the single batteries is crucial, namely, the batteries are subjected to capacity grading, namely capacity sorting, and the batteries with basically consistent performance are screened. However, the lithium battery is affected by the ambient temperature during capacity grading, so that the capacity test deviation is large, and the capacity grading result is inaccurate.
Disclosure of Invention
In order to solve the technical problems, the invention provides a lithium battery capacity grading capacity compensation method capable of improving the capacity grading accuracy of a lithium battery, a storage medium and lithium battery capacity grading equipment.
In a first aspect, the present invention provides a capacity grading compensation method for a lithium battery, including the following steps:
A. collecting the ambient temperature of the battery capacity grading;
B. detecting the production capacity of the battery;
C. reading corresponding compensation capacity according to the environment temperature and the production capacity, wherein the compensation capacity is the capacity at the specification temperature;
D. adjusting the detected battery capacity to the compensation capacity.
Optionally, the ambient temperature in step a refers to the temperature of the battery carrier.
Optionally, the battery carrier comprises a tray or a carrier strip.
Optionally, the corresponding relationship between the ambient temperature, the production capacity and the compensation capacity is as follows:
compensation capacity +0.6412 (X1X 1-25X 25) -44.337 (X1-25), X1 is ambient temperature.
Optionally, the capacity grading and compensating method for the lithium battery further includes the following steps:
and S, presetting a corresponding relation table of the production capacity, the ambient temperature and the compensation capacity.
Optionally, the step S specifically includes the following steps:
S1, discharging the battery at the first temperature, and recording the battery capacity;
s2, placing the battery at the specification temperature for a preset time;
s3, charging the battery to full charge at the specification temperature;
s4, discharging the battery at a second temperature, and recording the capacity of the battery;
s5, placing the battery at the specification temperature for a preset time;
s6, charging the battery to full charge at the specification temperature;
s7, discharging the battery at a third temperature, and recording the capacity of the battery;
and analogizing in turn to obtain a functional relation between the ambient temperature and the battery capacity, and making a corresponding relation table of the production capacity, the ambient temperature and the compensation capacity.
Optionally, the first temperature, the second temperature, and the third temperature decrease sequentially.
Optionally, the specification temperature is 25 ℃, and the predetermined time is one hour.
In a second aspect, the present invention further provides a computer-readable storage medium, which stores a lithium battery capacity grading capacity compensation program, and when the lithium battery capacity grading capacity compensation program is executed by a processor, the lithium battery capacity grading capacity compensation program is used for implementing the lithium battery capacity grading capacity compensation method.
In a third aspect, the present invention further provides a lithium battery capacity grading device, including a processor and a memory connected to the processor, where the memory stores a lithium battery capacity grading capacity compensation program, and the lithium battery capacity grading capacity compensation program is used by the processor to implement the lithium battery capacity grading capacity compensation method described above.
The invention discloses a lithium battery capacity grading capacity compensation method, a storage medium and lithium battery capacity grading equipment, wherein the lithium battery capacity grading capacity compensation method comprises the following steps: A. collecting the ambient temperature of the battery capacity grading; B. detecting the production capacity of the battery; C. reading corresponding compensation capacity according to the environment temperature and the production capacity, wherein the compensation capacity is the capacity at the specification temperature; D. adjusting the detected battery capacity to the compensation capacity. The invention can accurately classify the lithium battery.
Drawings
FIG. 1 is a block diagram of a flow chart of a lithium battery capacity grading compensation method according to an embodiment of the present invention;
FIG. 2 is a table showing the correspondence between the production capacity of the battery, the ambient temperature and the compensation capacity in the embodiment of the present invention;
FIG. 3 is a linear relationship of temperature to battery capacity in an embodiment of the present invention;
fig. 4 is a block diagram of a lithium battery capacity grading device in the embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
Example one
The present embodiment provides a method for compensating capacity of a lithium battery, as shown in fig. 1, the method for compensating capacity of a lithium battery includes the following steps:
s100, collecting the ambient temperature of the battery capacity grading;
specifically, although the capacity of the battery is measured at a specification temperature (e.g., 25 ℃), the battery is produced in large quantities in batch production, and the environmental temperature of the production workshop is too large, so that the environmental temperature of the battery may not be the specification temperature, and the temperature may deviate, and therefore the environmental temperature of the battery is detected.
The method for detecting the environmental temperature is to detect the temperature of a carrier for placing the battery, and generally, the battery is placed in a tray or on a supporting strip, so the battery carrier comprises the tray or the supporting strip and the like. The temperature of a tray or a tray strip for placing the battery, namely the ambient temperature of the battery is detected.
As shown in fig. 1, the capacity grading compensation method for lithium battery further includes the following steps:
s200, detecting the production capacity of the battery;
specifically, the production capacity refers to the capacity of the battery actually detected by the detection device, the ambient temperature is detected in step S100, and the capacity of the battery at the ambient temperature is detected in step S200. It is understood that steps S100 and S200 are not sequential, and may be performed in sequence or simultaneously.
As shown in fig. 1, the capacity grading compensation method for lithium battery further includes the following steps:
s300, reading corresponding compensation capacity according to the environment temperature and the production capacity, wherein the compensation capacity is the capacity at the specification temperature;
specifically, a correspondence table is searched according to the ambient temperature detected in step S100 and the production capacity detected in step S200, the correspondence table is a correspondence table (as shown in fig. 2) between the ambient temperature and the production capacity and the compensation capacity, and is also a specification used in the production, the correspondence table is obtained through experiments, the compensation capacity corresponding to the detected ambient temperature and the production capacity is found according to the correspondence table, the compensation capacity is an accurate corrected capacity value, the corrected capacity value is a capacity value for correcting the capacity value to a capacity value at a specification temperature (generally 25 ℃), because the detected production capacity is a capacity value at the ambient temperature, the detection temperature set when the battery is subjected to capacity grading in the production is the specification temperature, but a local region temperature deviation occurs, which causes the ambient temperature at which the battery is located to be not 25 ℃, therefore, the capacity value is corrected to the capacity value at the specification temperature, so that the capacity values of all the batteries are the capacity values at 25 ℃, the screening standards can be unified, and the batteries with higher consistency can be selected.
As shown in fig. 1, the capacity grading compensation method for lithium battery further includes the following steps:
s400, adjusting the detected battery capacity to the compensation capacity;
specifically, as described above, the actually detected production capacity value is only the capacity value at the ambient temperature, and the detected battery capacity needs to be corrected to the capacity value at the specification temperature, that is, to the compensation capacity in fig. 2. As shown in fig. 2, for example, if the battery capacity detected by the detection device is 2650Ah, that is, the production capacity is 2650Ah, and the ambient temperature is 30.5 ℃, the battery capacity value is not directly outputted and displayed as 2650Ah, but the battery capacity detection result is corrected and outputted and displayed, and if the compensation capacity corresponding to the production capacity 2650Ah and the ambient temperature of 30.5 ℃ is 2601.9Ah, the battery capacity value is outputted and displayed as 2601.9Ah, as can be seen by looking up the correspondence table shown in fig. 2.
The invention can correct the capacity value according to the detected production capacity and the ambient temperature, and find the corresponding compensation capacity at the specification temperature, so that the detection result of the capacity value of the battery is more accurate, and the accuracy of the grading of the battery is improved.
According to the experiment, the corresponding relation among the ambient temperature, the production capacity and the compensation capacity is as follows:
Compensation capacity +0.6412 (X1X 1-25X 25) -44.337 (X1-25), X1 is ambient temperature.
As shown in fig. 2, when the production capacity is 2650mAh and the ambient temperature is 30.5 ℃, the compensation capacity is 2650+0.6412 (30.5 × 30.5-25 × 25) -44.337 (30.5-25) ═ 2601.9 (production capacity +0.6412 × X1 × 1-25 × 25) -44.337 (X1-25) — according to the above formula, so that the capacity of the cell at 25 ℃ is 2601.9.
The lithium battery capacity grading capacity compensation method further comprises the following steps:
s1, presetting a corresponding relation table of the production capacity, the environment temperature and the compensation capacity;
specifically, the battery is tested under laboratory conditions, the temperature control of the laboratory is relatively accurate, the capacity of the battery at any temperature can be accurately detected, after capacity values of the battery at different temperatures are detected in the laboratory, linear regression analysis is carried out on detected data in an EXCEL table by using a trend line method to obtain a functional relation between the temperature and the battery capacity, fig. 3 is a linear relation between the temperature and the battery capacity in the embodiment of the invention, a temperature axis in fig. 3 is an X axis, a capacity axis is a Y axis, and a relation between the temperature and the capacity is a relation between Y and 0.6412X2+44.337x +1876.4, the formula for correcting the production capacity detected at ambient temperature to the compensation capacity at the specification temperature (25 ℃) can be obtained according to the relation: compensation capacity +0.6412 (X1X 1-25X 25) -44.337 (X1-25). The corresponding relation table shown in fig. 2 can be made according to the calculation formula of the compensation capacity, and the capacity of the battery can be directly divided The compensation capacity can be obtained by looking up the corresponding relation table according to the detected environmental temperature and the production capacity.
Further, step S1 specifically includes the following steps:
s11, discharging the battery at the first temperature, and recording the battery capacity;
s12, placing the battery at the specification temperature for a preset time;
s13, charging the battery at the specification temperature;
s14, discharging the battery at a second temperature, and recording the capacity of the battery;
s15, placing the battery at the specification temperature for a preset time;
s16, charging the battery at the specification temperature;
s17, discharging the battery at a third temperature, and recording the capacity of the battery;
and analogizing in turn to obtain a functional relation between the temperature and the battery capacity, and making a corresponding relation table of the production capacity, the environment temperature and the compensation capacity.
The first temperature, the second temperature and the third temperature decrease in sequence, and one of the first temperature, the second temperature and the third temperature can be arbitrarily selected as long as the first temperature, the second temperature and the third temperature are in a decreasing trend. The predetermined time for leaving the battery at the specification temperature for the predetermined time in step S12 may be adjusted as necessary, and is generally 1 hour, but may be other times, and is not limited herein.
In one embodiment, step S1 specifically includes the following steps:
s111, discharging the battery at 40 ℃, discharging to the lowest voltage at the temperature, and recording the battery capacity at the temperature;
s112, placing the battery for one hour at 25 ℃;
s113, charging the battery to be full at 25 ℃;
s114, discharging the battery at 35 ℃, discharging to the lowest voltage at the temperature, and recording the battery capacity at the temperature;
s115, placing the battery for one hour at 25 ℃;
s116, charging the battery to be fully charged at 25 ℃;
s117, discharging the battery at 30 ℃, discharging to the lowest voltage at the temperature, and recording the battery capacity at the temperature;
and repeating the steps, sequentially detecting the battery capacity of the battery at 25 ℃, 23 ℃ and 20 ℃, obtaining a functional relation between the temperature and the battery capacity, and making a corresponding relation table of the production capacity, the environmental temperature and the compensation capacity.
Example two
Based on the foregoing, an embodiment of the present invention further provides a computer-readable storage medium, where a capacity grading capacity compensation program for a lithium battery is stored in the computer-readable storage medium, where the capacity grading capacity compensation program is executed by a processor to implement the capacity grading capacity compensation method for the lithium battery, where the capacity grading capacity compensation method for the lithium battery includes:
S100, collecting the ambient temperature of the battery capacity grading;
s200, detecting the production capacity of the battery;
s300, reading corresponding compensation capacity according to the environment temperature and the production capacity;
and S400, adjusting the detected battery capacity to the compensation capacity.
Of course, the computer-readable storage medium provided in the embodiments of the present invention has computer-executable instructions that are not limited to the operations of the method described above, and may also perform related operations in the lithium battery capacity grading capacity compensation method provided in any embodiments of the present invention.
EXAMPLE III
Based on the above, an embodiment of the present invention further provides a lithium battery capacity grading device, fig. 4 is a block diagram of a structure of the lithium battery capacity grading device in the embodiment of the present invention, and as shown in fig. 4, the testing device includes a processor 10 and a memory 20 connected to the processor 10. The memory 20 stores a lithium battery capacity grading compensation program.
The processor 10 may be, in some embodiments, a Central Processing Unit (CPU), a microprocessor or other data processing chip, and is configured to run program codes stored in the memory 20 or process data, such as executing the lithium battery capacity grading compensation program.
The step of implementing the lithium battery capacity grading capacity compensation method when the lithium battery capacity grading capacity compensation program is executed is specifically described in the first embodiment.
From the above description of the embodiments, it is obvious for those skilled in the art that the present invention can be implemented by software and necessary general hardware, and certainly, can also be implemented by hardware, but the former is a better embodiment in many cases.
It should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Numerous obvious variations, adaptations and substitutions will occur to those skilled in the art without departing from the scope of the invention. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.
Claims (10)
1. A capacity grading capacity compensation method for a lithium battery is characterized by comprising the following steps:
A. collecting the ambient temperature of the battery capacity grading;
B. detecting the production capacity of the battery;
C. Reading corresponding compensation capacity according to the environment temperature and the production capacity, wherein the compensation capacity is the capacity at the specification temperature;
D. adjusting the detected battery capacity to the compensation capacity.
2. The capacity grading and capacity compensating method of a lithium battery as claimed in claim 1, wherein the ambient temperature in step a is the temperature of the battery carrier.
3. The lithium battery capacity grading capacity compensation method of claim 2, wherein the battery carrier comprises a tray or a carrier strip.
4. The capacity grading and capacity compensating method of a lithium battery as claimed in claim 1, wherein the corresponding relationship among the ambient temperature, the production capacity and the compensation capacity is as follows:
compensation capacity +0.6412 (X1X 1-25X 25) -44.337 (X1-25), X1 is ambient temperature.
5. The capacity grading capacity compensation method of a lithium battery as claimed in claim 1, further comprising the steps of:
and S, presetting a corresponding relation table of the production capacity, the ambient temperature and the compensation capacity.
6. The capacity grading and capacity compensating method of a lithium battery as claimed in claim 5, wherein the step S specifically comprises the steps of:
S1, discharging the battery at the first temperature, and recording the battery capacity;
s2, placing the battery at the specification temperature for a preset time;
s3, charging the battery to full charge at the specification temperature;
s4, discharging the battery at a second temperature, and recording the capacity of the battery;
s5, placing the battery at the specification temperature for a preset time;
s6, charging the battery to full charge at the specification temperature;
s7, discharging the battery at a third temperature, and recording the capacity of the battery;
and analogizing in turn to obtain a functional relation between the temperature and the battery capacity, and making a corresponding relation table of the production capacity, the environment temperature and the compensation capacity.
7. The capacity grading and capacity compensating method of a lithium battery as claimed in claim 6, wherein the first temperature, the second temperature and the third temperature are sequentially decreased in a decreasing order.
8. The capacity grading and capacity compensating method of a lithium battery according to claim 6, wherein the specification temperature is 25 ℃ and the predetermined time is one hour.
9. A computer-readable storage medium storing a lithium battery capacity grading capacity compensation program which, when executed by a processor, is configured to implement the lithium battery capacity grading capacity compensation method according to any one of claims 1 to 4.
10. A lithium battery capacity grading device, comprising a processor and a memory connected to the processor, wherein the memory stores a lithium battery capacity grading capacity compensation program, and the lithium battery capacity grading capacity compensation program is executed by the processor to implement the lithium battery capacity grading capacity compensation method according to any one of claims 1 to 4.
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2020
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