CN115128490A - Battery health state detection system and method - Google Patents

Abstract

The present application discloses a battery health state detection system and method. The method includes the following steps: charging or discharging the battery for a short time; selecting two time points during the charging or discharging working period to represent the first time point and the second time point respectively; measuring the battery at the first time point measure the second voltage value of the battery at the second time point; calculate a voltage difference between the second voltage value and the first voltage value; calculate a time difference between the second time point and the first time point ; and dividing the time difference by the voltage difference to calculate the aging parameter of the battery.

Description

Battery health state detection system and method

technical field

The present application relates to batteries, and in particular, to a battery health state detection system and method.

Background technique

At present, with the increasing demand for battery applications, more attention is paid to the precise control of battery capacity and life (ie, the number of times the battery can be charged and discharged). The traditional battery life detection method is realized by charging and discharging the battery completely. However, this detection method consumes too much testing time and cost, and is sometimes difficult to implement in commercial applications.

SUMMARY OF THE INVENTION

The technical problem to be solved by this application is to provide a battery state of health detection method for the shortcomings of the prior art, which includes the following steps: briefly charging or discharging the battery; the first voltage value at the time point; during the charging or discharging process of the battery, measure the second voltage value of the battery at the second time point; calculate a voltage difference between the second voltage value and the first voltage value; calculate the second time point a time difference from the first time point; and dividing the time difference by the voltage difference to calculate the aging parameter.

In one embodiment, the battery state-of-health detection method further includes the following steps: performing multiple charge-discharge cycles on the battery; after a certain number of charge-discharge cycles, measuring and calculating the aging parameters of the battery to obtain the aging parameters of the battery. data of the parameters and the number of charge-discharge cycles; and calculating the relationship between the aging parameters of the battery and the number of charge-discharge cycles of the battery to generate the first relationship data.

In one embodiment, the battery state-of-health detection method further comprises the steps of: measuring the battery capacity of the battery for each charge-discharge cycle; dividing the battery capacity of each charge-discharge cycle by the initial capacity of the battery to obtain a calculated battery state of health; and calculating a relationship between the number of charge-discharge cycles of the battery and the state of health of the battery to generate second relationship data.

In one embodiment, the battery state of health detection method further includes the following steps: measuring the aging parameter of the battery to be tested; and calculating the current accumulated charge and discharge of the battery to be tested based on the first relational data and the aging parameter of the battery to be tested the number of cycles; and based on the second relational data, according to the calculated number of battery charge and discharge cycles, to calculate the corresponding battery state of health.

In addition, the present application provides a battery health state detection system, which includes a charging and discharging circuit, a measuring circuit, and an arithmetic circuit. The charge and discharge circuit is configured to pulse charge or discharge the battery. The measurement circuit is connected to the battery. The measurement circuit is configured to measure two time points selected during the charging and discharging process of the battery, denoted as a first time point and a second time point, respectively, and to measure a first voltage value at the first time point and a second time point at the second time point. Voltage value. The arithmetic circuit is connected to the charge and discharge circuit and the measurement circuit. The arithmetic circuit calculates a voltage difference between the second voltage value and the first voltage value, calculates a time difference between the second time point and the first time point, and divides the time difference by the voltage difference to calculate the aging of the battery parameter.

In one embodiment, the charge-discharge circuit performs multiple charge-discharge cycles on the battery, and after accumulating a specific number of charge-discharge cycles, the detected battery health state, pulses the battery to charge or discharge, and the arithmetic circuit calculates that the battery is in a specific charge-discharge cycle. The aging parameter at the number of discharge cycles is obtained by obtaining the data of the aging parameter of the battery and the number of charging and discharging cycles, and calculating the relationship between the aging parameter of the battery and the number of charging and discharging cycles of the battery to generate the first relational data.

In one embodiment, the measurement circuit measures the battery capacity of the battery for each charge-discharge cycle, and the arithmetic circuit divides the battery capacity for each charge-discharge cycle by the battery's initial capacity to calculate the battery's charge-discharge state with the calculated battery state of health. The number of cycles is related to the state of health of the battery to generate the second relationship data.

In one embodiment, the measurement circuit measures the voltage and time data of the battery under test, the arithmetic circuit calculates the aging parameter of the battery under test, and then calculates the current accumulated charge of the battery under test based on the first relationship data and the aging parameter of the battery. The number of discharge cycles is calculated based on the second relationship data to calculate the battery state of health corresponding to the current accumulated number of charge and discharge cycles of the battery under test.

As mentioned above, the battery state of health detection system and method, which is different from the traditional battery measurement method, does not need to undergo complete charging and discharging, but only needs a short discharge or charging measurement to obtain the voltage and time data of the battery, and calculate the aging. parameters, and then using the known aging relationship, the current battery health state of the battery can be estimated. The commercial value of the technology of the present application lies in that it can estimate the battery health status in a short time, so as to provide information on how long the battery can be used for the remaining life (evaluation of the remaining life of the battery), replacing the traditional detection method of complete charging and discharging, and greatly reducing the test cost , to provide effective data for the battery, so as to maximize the benefits after the battery is remanufactured.

For a further understanding of the features and technical content of the present application, please refer to the following detailed descriptions and drawings related to the present application. However, the drawings provided are only for reference and description, and are not intended to limit the present application.

Description of drawings

FIG. 1 is a flowchart of steps of measuring battery data and calculating aging parameters of a battery state of health detection method according to an embodiment of the present application.

FIG. 2 is a flowchart of steps for calculating a relational expression of a battery state of health in a method for detecting a state of health of a battery according to an embodiment of the present application.

FIG. 3 is a flowchart of steps of measuring a battery under test and evaluating the state of health of the battery under test using a relational expression in a battery state of health detection method according to an embodiment of the present application.

FIG. 4 is a block diagram of a battery health state detection system according to an embodiment of the present application.

Detailed ways

The following are specific specific examples to illustrate the embodiments of the present application, and those skilled in the art can understand the advantages and effects of the present application from the content disclosed in this specification. The present application can be implemented or applied through other different specific embodiments, and various details in this specification can also be modified and changed based on different viewpoints and applications without departing from the concept of the present application. In addition, the drawings of the present application are only for simple schematic illustration, and are not drawn according to the actual size, and are stated in advance. The following embodiments will further describe the related technical contents of the present application in detail, but the disclosed contents are not intended to limit the protection scope of the present application. In addition, the term "or", as used herein, should include any one or a combination of more of the associated listed items as the case may be.

Please refer to FIG. 1 and FIG. 4 , wherein FIG. 1 is a flow chart of steps of measuring battery data and calculating aging parameters of a battery state of health detection method according to an embodiment of the application; FIG. 4 is a block diagram of a battery state of health detection system according to an embodiment of the application. picture.

The battery state of health detection method of the present embodiment may include steps S103 to S115 as shown in FIG. 1 , which may include the charging and discharging circuit 10 , the measurement circuit 20 and the arithmetic circuit 30 included in the battery state of health detection system as shown in FIG. 4 . The implementation is only exemplified here, and the present application is not limited thereto. In practice, the steps in this document can be replaced with other circuit components for execution, and the execution sequence or content of the steps can be appropriately adjusted according to actual needs.

First, steps S103 to S107 are performed to measure the data of the battery 100 .

In step S103 , the battery 100 is connected to the battery 100 by the charging and discharging circuit 10 to perform pulse charging or discharging of the battery 100 for state of health detection.

In step S105, during the charging or discharging process of the battery 100, the measuring circuit 20 is used to connect or contact the battery 100 to measure the first voltage value of the battery 100 at the first time point.

In step S107, during the charging or discharging process of the battery 100, the measurement circuit 20 is used to measure the second voltage value of the battery 100 at the second time point.

After the data of the battery 100 is measured, steps S109 to S115 are performed to calculate the aging parameters of the battery.

In step S109 , the operation circuit 30 is connected to the measurement circuit 20 to calculate the difference between the second voltage value and the first voltage value when the battery 100 is charged or discharged to obtain a voltage difference.

In step S111, the arithmetic circuit 30 is used to calculate the difference between the second time point and the first time point to obtain a time difference.

In step S113 , the aforementioned time difference value is divided by the voltage difference value using the arithmetic circuit 30 .

In step S115 , after the aforementioned calculation, the aging parameter of the battery 100 as a result of the calculation is obtained.

For example, use the arithmetic circuit 30 to calculate the inverse of the slope of the voltage change with time to obtain the aging parameter:

Among them, a represents the aging parameter, Δt represents the time difference between the second time point and the first time point, ΔV represents the voltage difference between the second voltage value and the first voltage value, t ₂ represents the second time point, and t ₁ represents At the first time point, V ₂ represents the second voltage value, and V ₁ represents the first voltage value.

Please refer to FIG. 1 , FIG. 2 and FIG. 4 , wherein FIG. 1 is a flowchart of steps of measuring battery data and calculating aging parameters of a battery state of health detection method according to an embodiment of the application; FIG. 2 is a battery state of health detection according to an embodiment of the application. A flow chart of the steps of calculating the relational expression of the battery state of health of the method; FIG. 4 is a block diagram of a battery state of health detection system according to an embodiment of the present application.

The battery state of health detection method of the present embodiment may include steps S201 to S215 as shown in FIG. 2 , which may be composed of the charge and discharge circuit 10 , the measurement circuit 20 and the operation circuit 30 included in the battery state of health detection system as shown in FIG. 4 . implement. The step S203 may include the aforementioned steps S103 to S107, and the step S205 may include the aforementioned steps S109 to S115.

In step S201: a charge-discharge cycle (Cycle) is performed on the battery. Herein, the battery 100 performs one full charge and one full discharge, completing one charge/discharge cycle.

In step S203, the data of the battery 100 is measured.

In step S205, the measured data of the battery 100 is used to calculate the aging parameter.

In step S207, the arithmetic circuit 30 is used to calculate the relationship between the aging parameter of the battery 100 and the number of battery charge and discharge cycles, so as to generate first relationship data such as a first relationship formula.

In step S209, the operation circuit 30 is used to measure the battery capacity (Capacity) of the battery 100 in each charge-discharge cycle. The foregoing step S209 can be replaced by the battery charge-discharge cycle times and battery capacity data provided by the manufacturer.

In step S211, the operation circuit 30 is used to calculate the battery health state according to the current battery capacity and the initial capacity of the battery 100, which is represented by the following formula:

Among them, SOH represents the state of health of the battery, Cp represents the battery capacity, Cy represents the number of charge and discharge cycles (N times), and N is an integer value.

In step S215, the arithmetic circuit 30 is used to calculate the relationship between the number of charge-discharge cycles of the battery 100 and the battery state of health of the battery 100 to generate second relationship data such as a second relationship.

After the above steps S201 to S215 are performed, the first relationship data such as the first relationship between the aging parameters of the battery 100 and the number of charge-discharge cycles of the battery 100 can be obtained, and the number of charge-discharge cycles of the battery 100 and the battery of the battery 100 can be obtained. The second relational data of the state of health, such as the second relational expression, can be used as a reference for evaluating the battery state of health of a battery to be tested (eg, but not limited to, discarded batteries) of the same type as the battery 100 , as described in detail below.

Please refer to FIGS. 1 to 4 , wherein FIG. 3 is a flow chart of steps of measuring the battery under test and evaluating the state of health of the battery under test using a relational expression in the battery state of health detection method according to an embodiment of the present application.

The battery state-of-health detection method of this embodiment may include steps S301 to S311 as shown in FIG. 3 to evaluate the state of health of the battery to be tested based on the above known information.

In step S301, the battery to be tested is obtained, such as but not limited to recycling waste batteries.

In step S303, the same manner as steps S103 to S115 are performed as described above to measure the aging parameter of the battery to be tested.

In step S305, the arithmetic circuit 30 is used to calculate the current accumulative number of charge and discharge cycles of the battery to be tested in step S307 according to the aging parameters (eg, substituting the aging parameters of the battery under test into the first relationship) based on the first relational expression.

In step S309, the arithmetic circuit 30 is used to substitute the number of charge-discharge cycles of the battery under test into the second relational expression based on the second relational expression, and in step S311, the state of health of the battery is calculated.

To sum up, the present application provides a battery state of health detection system and method, which is different from the traditional battery measurement method, does not require complete charge and discharge, only needs a short discharge or charge measurement, and obtains the voltage and time of the battery. data, calculate the aging parameters, and then use the known aging relationship to estimate the current battery state of health. The commercial value of the technology of the present application lies in that it can estimate the battery health status in a short time, so as to provide information on how long the battery can be used for the remaining life (evaluation of the remaining life of the battery), replacing the traditional detection method of complete charging and discharging, and greatly reducing the test cost , to provide effective data for the battery to maximize the benefits of battery applications.

The contents disclosed above are only optional and feasible embodiments of the present application, and are not therefore limited to the claims of the present application. Therefore, any equivalent technical changes made by using the contents of the description and drawings of the present application are included in the scope of the present application. in the claims.

Claims (7)

1. A method for detecting a state of health of a battery, wherein the method for detecting a state of health of a battery comprises the following steps: Briefly charge or discharge the battery; During the charging or discharging process of the battery, measuring a first voltage value of the battery at a first time point; During the charging or discharging process of the battery, measuring a second voltage value of the battery at a second time point; calculating a voltage difference between the second voltage value and the first voltage value; calculating the time difference between the second time point and the first time point; and The time difference value is divided by the voltage difference value to calculate the aging parameter of the battery. 2. The method for detecting a state of health of a battery according to claim 1, wherein the method for detecting the state of health of a battery further comprises the following steps: performing multiple charge-discharge cycles on the battery; After a certain number of charge-discharge cycles, measure and calculate the aging parameter of the battery, and obtain the data of the battery's aging parameter and the number of charge-discharge cycles; and The relationship between the aging parameter of the battery and the number of charge-discharge cycles of the battery is calculated to generate first relationship data. 3. The battery state-of-health detection method according to claim 2, wherein the battery state-of-health detection method further comprises the following steps: measuring the battery capacity of the battery for each charge-discharge cycle; dividing the battery capacity per charge-discharge cycle by the initial capacity of the battery to calculate the battery state of health; and The relationship between the number of charge-discharge cycles of the battery and the state of health of the battery is calculated to generate second relationship data. 4. The method for detecting a state of health of a battery according to claim 3, wherein the method for detecting the state of health of a battery further comprises the following steps: Measure the aging parameters of the battery to be tested; Based on the first relationship data, and according to the aging parameter of the battery to be tested, calculating the current accumulated number of charge-discharge cycles of the battery to be tested; and Based on the second relationship data, the corresponding state of health of the battery is calculated according to the calculated current number of charge and discharge cycles of the battery to be tested. 5. A battery state of health detection system, wherein the battery state of health detection system comprises: A charge-discharge circuit configured to pulse charge or discharge the battery; A measurement circuit, connected to the battery, configured to measure two time points selected during the charging and discharging process of the battery, respectively denoted as a first time point and a second time point, and to measure the first time point of the first time point a voltage value and a second voltage value at the second time point; and an arithmetic circuit, connected to the charge-discharge circuit and the measurement circuit, configured to calculate the voltage difference between the second voltage value and the first voltage value, and to calculate the second time point and the first time point The time difference value is divided by the voltage difference value to calculate the aging parameter of the battery. 6 . The battery state-of-health detection system according to claim 5 , wherein the charge-discharge circuit performs multiple charge-discharge cycles on the battery, and after accumulating a specific number of charge-discharge cycles, detects the state of health of the battery. The battery is charged or discharged in pulses, and the arithmetic circuit calculates the aging parameter of the battery at a specific number of charge and discharge cycles, obtains the data of the battery aging parameter and the number of charge and discharge cycles, and calculates the battery aging parameter. relationship with the number of charge-discharge cycles of the battery to generate first relationship data. 7 . The battery state-of-health detection system according to claim 6 , wherein the measurement circuit measures the battery capacity of the battery for each charge-discharge cycle, and the operation circuit measures the battery capacity of each charge-discharge cycle. 8 . Divide by the initial capacity of the battery to calculate the state of health of the battery, calculate the relationship between the number of charge and discharge cycles of the battery and the state of health of the battery to generate second relationship data, the measurement circuit measures the state of health of the battery The voltage and time data of the battery, the arithmetic circuit calculates the aging parameter of the battery, and then, based on the first relationship data, according to the aging parameter of the battery, to calculate the current accumulated number of charge and discharge cycles of the battery, based on The second relationship data is used to calculate the state of health of the battery corresponding to the number of charging and discharging cycles currently accumulated by the battery.

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