CN113687252A - Method for measuring battery capacity - Google Patents
Method for measuring battery capacity Download PDFInfo
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- CN113687252A CN113687252A CN202111088972.7A CN202111088972A CN113687252A CN 113687252 A CN113687252 A CN 113687252A CN 202111088972 A CN202111088972 A CN 202111088972A CN 113687252 A CN113687252 A CN 113687252A
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- battery capacity
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- 238000000034 method Methods 0.000 title claims abstract description 30
- 238000007599 discharging Methods 0.000 claims description 9
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 claims description 4
- 229910052744 lithium Inorganic materials 0.000 claims description 4
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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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
- G01R31/388—Determining ampere-hour charge capacity or SoC involving voltage measurements
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/3644—Constructional arrangements
- G01R31/3648—Constructional arrangements comprising digital calculation means, e.g. for performing an algorithm
-
- 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]
- G01R31/396—Acquisition or processing of data for testing or for monitoring individual cells or groups of cells within a battery
-
- 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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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Tests Of Electric Status Of Batteries (AREA)
- Secondary Cells (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The invention discloses a method for measuring battery capacity, which comprises the following steps: acquiring no-load voltage data of a battery; calculating initial battery capacity percentage SOC according to the no-load voltage of the battery, and acquiring a voltage value corresponding to the battery capacity percentage SOC; acquiring a battery voltage drop rate Vj; and acquiring a battery capacity percentage reduction rate SOCJ according to the acquired battery voltage reduction rate Vj to acquire a battery real-time capacity SOC display. The method for obtaining the battery no-load voltage data, the battery voltage reduction rate algorithm and the battery capacity percentage reduction rate can reasonably solve the corresponding voltage relation of the battery capacity and the corresponding relation between the terminal discharge and the battery capacity percentage data, can accurately calculate and display the battery capacity, and avoids the problems of early shutdown of the battery and inaccurate capacity caused by switching of high and low temperature application environments due to the inaccurate battery capacity.
Description
Technical Field
The invention relates to the technical field of power batteries, in particular to a method for measuring battery capacity.
Background
With the development of science and technology, power lithium batteries are widely applied to electric vehicles, electric tools, electronic digital products and the like, and it is very important to know the battery capacity in order to ensure that the electric products can normally operate. Therefore, how to accurately calculate and display the battery capacity, and avoid the problems of early shutdown of the battery caused by the inaccurate battery capacity and inaccurate capacity caused by switching of high and low temperature application environments become problems to be solved by those skilled in the art.
Disclosure of Invention
In order to solve the above technical problems, an object of the present invention is to provide a method for measuring battery capacity, which is used for accurately calculating and displaying real-time battery capacity.
The invention provides a method for measuring battery capacity, which comprises the following steps:
acquiring no-load voltage data of a battery;
calculating initial battery capacity percentage SOC according to the no-load voltage of the battery, and acquiring a voltage value corresponding to the battery capacity percentage SOC;
acquiring a battery voltage drop rate Vj;
obtaining a battery capacity percentage reduction rate SOCJ according to the obtained battery voltage reduction rate Vj;
and obtaining real-time battery capacity percentage SOC display according to the acquired battery capacity percentage descending rate SOCJ.
Further, the acquiring of the battery no-load voltage data specifically includes:
and (3) adopting lithium battery discharge test equipment or adopting a universal meter to test, and recording the no-load voltage of the battery.
Further, the calculating the initial battery capacity percentage SOC according to the battery no-load voltage and obtaining a voltage value corresponding to the battery capacity percentage SOC specifically include:
discharging at the current of 0.05C of the battery pack capacity, recording the battery current and the battery voltage at the time interval of 1S, and then finding out voltage data corresponding to the battery capacity percentage SOC according to the integral PT of the current to the time.
Further, the battery capacity percentage SOC is expressed in 0%, 1%, 2%... 100%; voltage values corresponding to the battery capacity percentage SOC are represented as V0, V1, and V2.
Further, the obtaining of the battery voltage drop rate Vj specifically includes:
defining the battery emptying voltage as UV, collecting the current battery current, determining that the battery is in the discharging process, starting to record the battery voltage as VB0 at an interval of 5S, and collecting and recording the battery voltage as VB 1; the battery voltage drop rate Vj is calculated using the following equation:
the battery voltage drop rate (Vj) — (VB0-VB1)/((VB0-UV) × 5)/sec.
Further, the battery capacity percentage decrease rate SOCJ is obtained according to the obtained battery voltage decrease rate Vj, and the following formula is specifically adopted:
battery capacity percentage decrease ratio (SOCJ) — battery capacity percentage Vj/sec.
Further, the acquiring of the real-time capacity SOC display of the battery specifically adopts the following formula:
the real-time battery capacity percentage SOC is (SOC- (SOC × SOCJ))/second.
The invention has the beneficial effects that: the embodiment of the invention provides a method for measuring battery capacity, which comprises the following steps: acquiring no-load voltage data of a battery; calculating initial battery capacity percentage SOC according to the no-load voltage of the battery, and acquiring a voltage value corresponding to the battery capacity percentage SOC; acquiring a battery voltage drop rate Vj; and acquiring a battery capacity percentage reduction rate SOCJ according to the acquired battery voltage reduction rate Vj to acquire a real-time battery capacity SOC display. The method for obtaining the battery no-load voltage data, the battery voltage reduction rate algorithm and the battery capacity percentage reduction rate can reasonably solve the corresponding voltage relation of the battery capacity and the corresponding relation between the terminal discharge and the battery capacity percentage data, can accurately calculate and display the battery capacity, and avoids the problems of early shutdown of the battery and inaccurate capacity caused by switching of high and low temperature application environments due to the inaccurate battery capacity.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained based on the drawings without inventive exercise.
FIG. 1 is a flow chart of the steps of a method of measuring battery capacity;
fig. 2 is a graph of percentage capacity corresponding to a battery voltage during discharge according to a method of measuring a battery capacity.
Detailed Description
The embodiment of the invention provides a method for measuring battery capacity, which is used for accurately calculating and displaying the battery capacity.
In order to make the objects, features and advantages of the present invention more obvious and understandable, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the embodiments described below are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The technical scheme of the invention is further explained by the specific implementation mode in combination with the attached drawings.
Example (b):
referring to fig. 1, fig. 1 is a flowchart illustrating a method for measuring battery capacity, including the following steps:
step 101: acquiring no-load voltage data of a battery;
specifically, the no-load voltage data of the battery is obtained through the test equipment.
Step 102: calculating initial battery capacity percentage SOC according to the no-load voltage of the battery, and acquiring a voltage value corresponding to the battery capacity percentage SOC;
specifically, an initial battery capacity percentage SOC is calculated, and a voltage value corresponding to the battery capacity percentage SOC is obtained.
Step 103: acquiring a battery voltage drop rate Vj;
specifically, defining the battery emptying voltage as UV, collecting the current battery current, confirming that the battery is in the discharging process, starting to record the battery voltage as VB0 at an interval of 5S, and collecting and recording the battery voltage as VB 1. The battery voltage drop rate (Vj) — (VB0-VB1)/((VB0-UV) × 5)/second.
Step 104: obtaining a battery capacity percentage reduction rate SOCJ according to the obtained battery voltage reduction rate Vj;
specifically, the battery capacity percentage decrease ratio (SOCJ) — the current capacity percentage Vj/sec.
Step 105: and obtaining real-time battery capacity percentage SOC display according to the acquired battery capacity percentage descending rate SOCJ.
Specifically, the real-time capacity SOC display of the battery is obtained through an algorithm.
Further, the acquiring of the battery no-load voltage data specifically includes:
and (3) adopting lithium battery discharge test equipment or adopting a universal meter to test, and recording the no-load voltage of the battery.
Further, the calculating the initial battery capacity percentage SOC according to the battery no-load voltage and obtaining a voltage value corresponding to the battery capacity percentage SOC specifically include:
discharging at the current of 0.05C of the battery pack capacity, recording the battery current and the battery voltage at the time interval of 1S, and then finding out voltage data corresponding to the battery capacity percentage SOC according to the integral PT of the current to the time.
Further, the battery capacity percentage SOC is expressed in 0%, 1%, 2%... 100%; voltage values corresponding to the battery capacity percentage SOC are represented as V0, V1, and V2.
Further, the obtaining of the battery voltage drop rate Vj specifically includes:
defining the battery emptying voltage as UV, collecting the current battery current, confirming that the battery is in the discharging process, starting to record the battery voltage as VB0, performing interval 5S, collecting and recording the battery voltage as VB1, and calculating the battery voltage reduction rate Vj by adopting the following formula:
the battery voltage drop rate (Vj) — (VB0-VB1)/((VB0-UV) × 5)/sec.
Further, the battery capacity percentage decrease rate SOCJ is obtained according to the obtained battery voltage decrease rate Vj, and the following formula is specifically adopted:
battery capacity percentage decrease ratio (SOCJ) — battery capacity percentage Vj/sec.
Further, the acquiring of the real-time capacity SOC display of the battery specifically adopts the following formula:
the battery implementation capacity SOC indicates (SOC- (SOC · SOCJ))/second.
The working principle is as follows: battery voltage drop rate algorithm: defining the battery emptying voltage as UV, collecting the current battery current, confirming that the battery is in the discharging process, starting to record the battery voltage as VB0 at an interval of 5S, and collecting and recording the battery voltage as VB 1. Battery voltage drop rate (Vj) — (VB0-VB1)/((VB0-UV) × 5)/second; battery capacity percentage decrease rate algorithm: battery capacity percentage decrease ratio (SOCJ) ═ current capacity percentage Vj/sec. The method of the invention can obtain the no-load voltage data of the battery, the voltage drop rate algorithm of the battery and the percentage drop rate of the battery capacity, can reasonably solve the corresponding voltage relation of the battery capacity and the corresponding relation between the terminal discharge and the percentage data of the battery capacity, and can accurately calculate and display the battery capacity.
In addition, fig. 2 is a graph of the battery capacity percentage corresponding to the battery voltage during the actual discharging process of the method for measuring the battery capacity according to the present invention, and it can be seen from fig. 2 that the battery capacity percentage is tracked and adjusted in real time to decrease the rate around the voltage rate of the discharged battery, and the actual battery capacity percentage is fed back relatively truly.
In summary, an embodiment of the present invention provides a method for measuring battery capacity, including the following steps: acquiring no-load voltage data of a battery; calculating initial battery capacity percentage SOC according to the no-load voltage of the battery, and acquiring a voltage value corresponding to the battery capacity percentage SOC; acquiring a battery voltage drop rate Vj; and acquiring a battery capacity percentage reduction rate SOCJ according to the acquired battery voltage reduction rate Vj to acquire a battery real-time capacity SOC display. The method for obtaining the battery no-load voltage data, the battery voltage reduction rate algorithm and the battery capacity percentage reduction rate can reasonably solve the corresponding voltage relation of the battery capacity and the corresponding relation between the terminal discharge and the battery capacity percentage data, can accurately calculate and display the battery capacity, and avoids the problems of early shutdown of the battery and inaccurate capacity caused by switching of high and low temperature application environments due to the inaccurate battery capacity.
The above-mentioned embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the same; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (7)
1. A method for measuring battery capacity is characterized by comprising the following steps:
acquiring no-load voltage data of a battery;
calculating initial battery capacity percentage SOC according to the no-load voltage of the battery, and acquiring a voltage value corresponding to the battery capacity percentage SOC;
acquiring a battery voltage drop rate Vj;
obtaining a battery capacity percentage reduction rate SOCJ according to the obtained battery voltage reduction rate Vj;
and obtaining real-time battery capacity percentage SOC display according to the acquired battery capacity percentage descending rate SOCJ.
2. The method for measuring battery capacity according to claim 1, wherein the obtaining of battery no-load voltage data specifically includes:
and (3) adopting lithium battery discharge test equipment or adopting a universal meter to test, and recording the no-load voltage of the battery.
3. The method for measuring battery capacity according to claim 1, wherein the calculating an initial battery capacity percentage SOC according to a no-load voltage of the battery and obtaining a voltage value corresponding to the battery capacity percentage SOC specifically includes:
discharging at the current of 0.05C of the battery pack capacity, recording the battery current and the battery voltage at the time interval of 1S, and then finding out voltage data corresponding to the battery capacity percentage SOC according to the integral PT of the current to the time.
4. The method of measuring battery capacity according to claim 1, wherein the battery capacity percentage SOC is expressed in 0%, 1%, 2%... 100%; voltage values corresponding to the battery capacity percentage SOC are represented as V0, V1, and V2.
5. The method for measuring battery capacity according to claim 1, wherein the obtaining of the battery voltage drop rate Vj specifically includes:
defining the battery emptying voltage as UV, collecting the current battery current, determining that the battery is in the discharging process, starting to record the battery voltage as VB0 at an interval of 5S, and collecting and recording the battery voltage as VB 1; the battery voltage drop rate Vj is calculated using the following equation:
the battery voltage drop rate (Vj) — (VB0-VB1)/((VB0-UV) × 5)/sec.
6. The method for measuring battery capacity according to claim 1, wherein the percentage battery capacity decrease rate SOCJ is obtained according to the obtained battery voltage decrease rate Vj, and the following formula is specifically adopted:
battery capacity percentage decrease ratio (SOCJ) — battery capacity percentage Vj/sec.
7. The method for measuring battery capacity according to claim 1, wherein the obtaining of the real-time battery capacity SOC display specifically uses the following formula:
the real-time battery capacity percentage SOC is (SOC- (SOC × SOCJ))/second.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114814616A (en) * | 2022-05-06 | 2022-07-29 | 广东力科新能源有限公司 | Rapid detection method and rapid detection system for battery capacity |
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