TWI817167B - Method and module of detecting state of health of battery - Google Patents

Abstract

A method of detecting the state of health (SoH) of the battery is to detect the electric current of the battery first; then derive the corresponding voltage value in reference to the voltage-depth of discharge (DoD) table based on the electric current value; next, calculate the estimated electric current value (Iest) based on the formula of relation

Description

Battery health detection method and module

The present invention relates to a detection method and its module; more specifically, it particularly relates to a battery health detection method and its module.

The battery state of health (State of Health; SOH) is a method of estimating the ratio of the total dischargeable power of the battery to the available capacity of the new factory battery. The battery state of health (State of Health; SOH) will reflect the overall performance of the battery and the conditions under certain conditions. The parameter of releasing electric energy refers to the ratio of the total discharged capacity of the battery to the available capacity of the new factory battery under specific conditions. However, with the long-term use of the battery, there will be many irrecoverable physical and chemical factors that cause the battery to age, resulting in The health of the battery decreases.

Currently, the detection method of battery state of health (State of Health; SOH) is to establish a graph of battery internal resistance, temperature, battery charging status and battery state of health (State of Health; SOH), and measure the battery internal resistance after Then look at the chart to know the battery's state of health (State of Health; SOH). However, the process of establishing a chart between various factors and the battery's state of health (State of Health; SOH) requires a large amount of experimental data to support, which means a large amount of equipment is needed. ,Hour Time and manpower are required to collect data, and preparation work in advance consumes a lot of costs.

In view of this, the applicant in this case relied on its many years of research and development experience in related fields to conduct in-depth discussions on the aforementioned deficiencies, and actively sought solutions based on the aforementioned needs. After a long period of hard research and multiple tests, it finally completed this project. invention.

The main purpose of the present invention is to provide a module and method that can quickly and low-cost know the health of the battery.

In order to achieve the above purpose, the battery health detection method of the present invention includes the following steps:

A. Measurement steps: measure the current of the normal battery and obtain its current Ia, and measure the current of the battery under test and obtain its current Ib.

B. Table lookup step: Check the voltage-discharge depth table of the normal battery and obtain its voltage Va, then check the voltage-discharge depth table of the battery under test and obtain its voltage Vb.

，取得估算電流值。 C. Current calculation steps: According to the relationship:

, obtain the estimated current value.

，對時間做積分以取得電池健康狀態(State of Health；SOH)。 D. Integration step: Compare the estimated current value (Iest) and the actual current value (I) according to the relationship:

, integrating time to obtain the battery state of health (State of Health; SOH).

In addition, the battery health detection module of the present invention includes a measurement unit, a table unit and a calculation unit.

The measuring unit is used to measure the current of the battery.

The table unit records the voltage corresponding to the battery current.

，取得估算電流值，最後將電流估算值(Iest)及實際電流值(I)根據關係式：

，對時間做積分以取得電池健康狀態(State of Health；SOH)。 The calculation unit is stored in a device with information processing capabilities, and the calculation unit is electrically connected to the measurement unit and the table unit, and the measurement unit compares the current measured by the measurement unit to the table unit to find the corresponding voltage, and then according to the relationship

, obtain the estimated current value, and finally combine the estimated current value (Iest) and the actual current value (I) according to the relationship:

, integrating time to obtain the battery state of health (State of Health; SOH).

1: Battery health detection method

11:Measurement steps

12: Table lookup steps

13: Current calculation steps

14: Integration steps

2:Battery health detection module

21:Measurement unit

22:Table unit

23:Computing unit

Figure 1: A schematic flow chart of the battery health detection method of the present invention; Figure 2: A schematic diagram of the operation of the battery health detection of the present invention; Figure 3: A schematic diagram of the battery health detection module of the present invention.

In order to provide a more detailed understanding of the purpose, effects, features and structure of the present invention, preferred embodiments are described below along with the drawings.

First, please refer to Figures 1 and 2. Figure 1 is a schematic flow chart of the battery health detection method of the present invention, and Figure 2 is a schematic diagram of the operation of the battery health detection method of the present invention.

Battery health detection method 1 of the present invention includes the following steps:

A. Measurement step 11: Use a current measuring instrument to measure the current of the normal battery and obtain its current Ia, and measure the current of the battery under test and obtain its current Ib.

B. Table lookup step 12: Check the voltage-discharge depth table of the normal battery based on the current Ia measured in the above measurement step 11, and find the corresponding voltage to obtain its voltage Va, and then follow the above measurement steps Use the current Ib measured in 11 to query the voltage-discharge depth table of the battery to be tested, and find the corresponding voltage to obtain its voltage Vb.

，取得電流估算值(Iest)，其中，關係式中的V代表著電池的理論電壓值。 C. Current calculation step 13: Use the current and voltage values obtained in the above measurement step 11 and table lookup step 12 according to the relationship formula:

, obtain the estimated current value (Iest), where V in the relationship represents the theoretical voltage value of the battery.

，對時間做積分以取得電池健康狀態(State of Health；SOH)。 D. Integration step 14: Calculate the estimated current value (Iest) and the actual current value (I) calculated in the above step C according to the relationship:

, integrating time to obtain the battery state of health (State of Health; SOH).

Please continue to refer to Figure 3, which is a schematic diagram of the battery health detection module of the present invention.

In addition, the battery health detection module 2 of the present invention includes a measurement unit 21, a table unit 22 and a calculation unit 23.

The measurement unit 21 is used to measure the current of the battery, and the measurement unit 21 is a current measuring instrument.

The table unit 22 records the voltage corresponding to the battery current.

，取得估算電流值，最後將電流估算值(Iest)及實際電流值(I)根據關係式：

，對時間做積分以取得電池健康狀態(State of Health；SOH)。 The calculation unit 23 is stored in a device with information processing capabilities, and the calculation unit 23 is electrically connected to the measurement unit 21 and the table unit 22, and the calculation unit 23 measures the data measured by the measurement unit 21. The current is compared with table unit 22 to find the corresponding voltage, and then according to the relationship

, obtain the estimated current value, and finally combine the estimated current value (Iest) and the actual current value (I) according to the relationship:

, integrating time to obtain the battery state of health (State of Health; SOH).

Based on the above, the advantage of the battery health detection method of the present invention is that as long as the current is measured and matched with the voltage-discharge depth table, the battery health can be calculated using a formula. Compared with the previous method of measuring battery internal resistance, this method The invention is obviously much faster than before in detecting and judging battery health.

Therefore, the present invention has excellent progress and practicability among similar products. At the same time, after searching domestic and foreign technical documents on this type of structure, it is true that no identical or similar structure existed before the application of this case. Therefore, this case It should meet the patent requirements of "creativity", "industrial applicability" and "progressivity", and the application must be filed in accordance with the law.

However, the above are only preferred embodiments of the present invention. Any other equivalent structural changes made by applying the description and patent scope of the present invention should be included in the patent scope of the present invention.

1: Battery health detection method

Claims (4)

A battery health detection method, the method includes the following steps: A. Measurement step: measure the current of the normal battery and obtain its current Ia, and measure the current of the battery under test and obtain its current Ib; B. Look up the table Steps: Query the voltage-discharge depth table of the normal battery and obtain its voltage Va, then query the voltage-discharge depth table of the battery to be tested and obtain its voltage Vb; C. Current calculation steps: According to the relationship expression

, obtain the estimated current value; D. Integration step: Combine the estimated current value (Iest) and the actual current value (I) according to the relationship:

, integrating time to obtain the battery state of health (State of Health; SOH). The battery health detection method as described in claim 1, wherein in the measuring step, a current measuring instrument is used to measure the current. A battery health detection module, which includes a measurement unit, a table unit and a calculation unit; the measurement unit is used to measure the current of the battery; the table unit records the voltage corresponding to the battery current; The calculation unit is stored in a device with information processing capabilities, and the calculation unit is electrically connected to the measurement unit and the table unit, and the measurement unit compares the current measured by the measurement unit. Find the corresponding voltage in this table cell, and then according to the relationship

, obtain the estimated current value, and finally combine the estimated current value (Iest) and the actual current value (I) according to the relationship:

, integrating time to obtain the battery state of health (State of Health; SOH). The battery health detection module of claim 3, wherein the measurement unit is a current measuring instrument.

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