TWI776434B - System and method of detecting state of health of battery - Google Patents

Abstract

A system and a method of detecting state of health of a battery are provided. The method includes steps of: discharging or charging the battery within a short time; selecting two time points that are respectively represented by a first time point and a second time point, from a working period during which the battery is charged or discharged; measuring a first voltage value of the battery at the first time point; measuring a second voltage value of the battery at the second time point; calculating a voltage difference between the first voltage value and the second voltage value; calculating a time difference between the first time point and the second time point; and dividing the time difference by the voltage difference to calculate an aging parameter of the battery.

Description

Battery health state detection system and method

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

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.

The technical problem to be solved by the present invention is to provide a battery state of health detection method in view of the deficiencies of the prior art, which includes the following steps: briefly charging or discharging the battery; the first voltage value at the 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 data of the aging parameter 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 relationship data.

In one embodiment, 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 of each charge-discharge cycle by the initial capacity of the battery to calculate and calculating 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.

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; The number of discharge cycles; and based on the second relationship data, according to the calculated number of battery charge and discharge cycles, to calculate the corresponding battery state of health.

In addition, the present invention 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 the first time point and the second time point respectively, and to measure the first voltage value and the second time point at the first time point the second voltage value. The operation circuit is connected to the charging and discharging circuit and the measuring 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 of each charge-discharge cycle by the initial capacity of the battery to calculate the battery's state of health by calculating the battery's charge and discharge capacity. The number of discharge cycles is related to the state of health of the battery to generate 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 based on the first relational data, according to the aging parameter of the battery, to calculate the current accumulated value of the battery under test. The number of charge-discharge cycles is calculated based on the second relationship data to calculate the battery state of health corresponding to the current accumulated charge-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, Calculate the aging parameters, and then use the known aging relationship to estimate the current battery state of health of the battery. The commercial value of the technology of the present invention lies in that it can estimate the state of health of the battery 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). , 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 invention, please refer to the following detailed descriptions and drawings of the present invention. However, the drawings provided are only for reference and description, and are not intended to limit the present invention.

The following are specific embodiments to illustrate the embodiments of the present invention, and those skilled in the art can understand the advantages and effects of the present invention from the content disclosed in this specification. The present invention 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 invention. In addition, the drawings of the present invention are merely schematic illustrations, 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 invention in detail, but the disclosed contents are not intended to limit the protection scope of the present invention. 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 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 invention; FIG. 4 is a flowchart of a battery state of health detection system of an embodiment of the present invention. block diagram.

The battery state of health detection method of this 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 included in the battery state of health detection system as shown in FIG. 4 . 30 is executed, which is only exemplified here, and the present invention is not limited thereto. In practice, the steps in this document can be replaced by other circuit elements 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 executed 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 executed to calculate the aging parameters of the battery.

In step S109 , the arithmetic 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.

， 其中，a代表老化參數，

第二時間點與第一時間點的時間差值，

代表第二電壓值與第一電壓值的電壓差值，

代表第二時間點，

代表第一時間點，

代表第二電壓值，

代表第一電壓值。 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:

, where a represents the aging parameter,

The time difference between the second time point and the first time point,

represents the voltage difference between the second voltage value and the first voltage value,

represents the second time point,

represents the first point in time,

represents the second voltage value,

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 present invention; FIG. 2 is a battery state of health of an embodiment of the present invention. A flow chart of the steps of calculating the relational expression of the battery state of health of the detection method; FIG. 4 is a block diagram of a battery state of health detection system according to an embodiment of the present invention.

The battery state of health detection method of this embodiment may include steps S201 to S215 as shown in FIG. 2 , which may include the charging and discharging circuit 10 , the measurement circuit 20 and the arithmetic circuit included in the battery state of health detection system as shown in FIG. 4 . 30 execute. Wherein, step S203 may include the aforementioned steps S103-S107, and step S205 may include the aforementioned steps S109-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 measured to calculate an 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.

， 其中，

代表電池健康狀態(State of Health)，

代表電池容量，

代表充放電循環次數(N次)，N為整數值。 In step S211, using the arithmetic circuit 30, according to the current battery capacity and the initial capacity of the battery 100, to calculate the battery state of health in step S213, which is represented by the following formula:

, in,

Represents the State of Health of the battery,

represents the battery capacity,

Represents the number of charge-discharge cycles (N times), where 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 under test (eg, but not limited to a retired battery) of the same type as the battery 100 , as described in detail below.

Please refer to FIG. 1 to FIG. 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 a battery state of health detection method according to an embodiment of the present invention.

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 aging parameters of the battery to be tested are measured in the same manner as in steps S103 to S115 as described above.

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 invention 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 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 invention lies in that it can estimate the state of health of the battery 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). , to provide effective data for the battery to maximize the benefits of battery applications.

The contents disclosed above are only preferred feasible embodiments of the present invention, and are not intended to limit the scope of the present invention. Therefore, any equivalent technical changes made by using the contents of the description and drawings of the present invention are included in the application of the present invention. within the scope of the patent.

S103~S115, S201~S215, S301~S311: Steps 10: Charge and discharge circuit 100: battery 20: Measurement circuit 30: Operational circuit

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 invention.

FIG. 2 is a flow chart 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 invention.

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 a battery state of health detection method according to an embodiment of the present invention.

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

S103~S115: Steps

Claims (7)

A battery health state detection method, comprising the following steps: charging or discharging a battery; measuring a first voltage value of the battery at a first time point during the charging or discharging process of the battery; During the discharging process, measure a second voltage value of the battery at a second time point; and divide a time difference obtained by subtracting the first time point from the second time point by the second voltage A voltage difference of the first voltage value is subtracted from the value to calculate the aging parameter of the battery, which is expressed by the following equation:

Among them, a represents the aging parameter of the battery, Δt represents the time difference, ΔV represents the voltage difference, t ₂ represents the second time point, t ₁ represents the first time point, and V ₂ represents the second time point Voltage value, V ₁ represents the first voltage value. The battery state-of-health detection method according to claim 1, further comprising 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 data of the aging parameter of the battery and the number of charge and discharge cycles; and the relationship between the aging parameter of the battery and the number of charge and discharge cycles of the battery is calculated to generate a first relationship data. The battery health state detection method according to claim 2, further comprising the following steps: 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 Calculate a state of health of a battery; and calculate the relationship between the number of charge and discharge cycles of the battery and the state of health of the battery, to obtain A second relational data is generated. The battery state-of-health detection method according to claim 3, further comprising the steps of: measuring an aging parameter of a battery to be tested; calculating the battery to be tested according to the aging parameter of the battery to be tested based on the first relational data The current accumulated number of charge and discharge cycles; and based on the second relationship data, according to the calculated current number of charge and discharge cycles of the battery under test, to calculate the corresponding state of health of the battery. A battery state of health detection system, comprising: a charge and discharge circuit configured to pulse charge or discharge a battery; a measurement circuit connected to the battery and configured to measure two times selected during the charge and discharge process of the battery points, respectively expressed as a first time point and a second time point, and measure a first voltage value at the first time point and a second voltage value at the second time point; and an arithmetic circuit, connected to The charging and discharging circuit and the measuring circuit are configured to divide a time difference value obtained by subtracting the first time point from the second time point by a value obtained by subtracting the first voltage value from the second voltage value The voltage difference to calculate an aging parameter of the battery, expressed by the following equation:

Among them, a represents the aging parameter of the battery, Δt represents the time difference, ΔV represents the voltage difference, t2 represents the _second time point, t1 represents the _first time point, and V2 represents the _second time point voltage value, V ₁ represents the first voltage value. The battery state-of-health detection system of 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 a battery state of health, and performs pulse charging or Discharge, the arithmetic circuit calculates the aging parameters of the battery at a specific number of charge-discharge cycles, obtains the data of the battery's aging parameters and the number of charge-discharge cycles, and calculates the relationship between the battery's aging parameters and the number of charge-discharge cycles of the battery, To produce a first relational data. The battery state of health detection system of claim 6, wherein the measurement circuit measures the battery capacity of the battery for each charge-discharge cycle, and the arithmetic circuit divides the battery capacity of each charge-discharge cycle 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 a second relationship data, the measurement circuit measures the voltage and time data of the battery to be tested, the calculation The circuit calculates the aging parameter of the battery to be tested, and then calculates the current accumulative number of charge and discharge cycles of the battery to be tested based on the first relationship data and the aging parameter of the battery to be tested, and calculates the current accumulated number of charge and discharge cycles based on the second relationship data. The state of health of the battery under test corresponding to the current accumulated number of charge and discharge cycles.

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