JP-7854827-B2 - Polarity reversal detection system, polarity reversal detection device, polarity reversal detection method, polarity reversal detection program, and storage medium

Inventors

• 渡邉 佳孝

Assignees

• 古河電気工業株式会社
• 古河ＡＳ株式会社

Dates

Publication Date

20260507

Application Date

20220325

Claims (16)

1. A controller is provided which is configured to acquire the change in resistance value calculated based on the discharge current value and discharge voltage value of a rechargeable battery, The controller is configured to determine that a polarity reversal has occurred in the rechargeable battery when the amount of change in the resistance value shifts from an increasing trend to a decreasing trend . The controller is configured to determine that the change in the resistance value is on an increasing trend if the latest change in the resistance value is greater than the previous change for at least two consecutive times. Pole reversal detection system.
2. The controller is configured to calculate the amount of change in the resistance value based on the discharge current value and the discharge voltage value. The polarity reversal determination system according to claim 1.
3. The controller is configured to determine that the change in the resistance value is showing an increasing trend if, for at least two consecutive times, the latest change in the resistance value is greater than the previous change, and for at least two consecutive times, the latest value of the resistance value is greater than the previous value. A polarity reversal determination system according to claim 1 or 2 .
4. The controller is configured to calculate the amount of change in the resistance value by subtracting the previous value from the latest value of the resistance value. The polarity reversal determination system according to claim 3 .
5. The controller is configured to determine that the change in the resistance value is showing a decreasing trend if the latest change in the resistance value is smaller than the previous change for at least two consecutive times. A polarity reversal determination system according to any one of claims 1 to 4 .
6. A controller is provided which is configured to acquire the change in resistance value calculated based on the discharge current value and discharge voltage value of a rechargeable battery, The controller is configured to determine that a polarity reversal has occurred in the rechargeable battery when the amount of change in the resistance value shifts from an increasing trend to a decreasing trend. The controller is configured to calculate the amount of change in the resistance value based on the open-circuit voltage of the rechargeable battery, the discharge current value, and the discharge voltage value. Pole reversal detection system .
7. The controller is configured to calculate the resistance value by dividing the difference between the open-circuit voltage and the discharge voltage value by the discharge current value. The polarity reversal determination system according to claim 6 .
8. The controller is configured to calculate the resistance value by dividing the difference between the open-circuit voltage and the average voltage value of the discharge voltage by the average current value of the discharge current. The polarity reversal determination system according to claim 6 or 7 .
9. The controller further comprises a current sensor electrically connected to the controller and configured to measure the discharge current value of the rechargeable battery. A polarity reversal determination system according to any one of claims 1 to 8 .
10. The controller further comprises a voltage sensor electrically connected to the controller and configured to measure the discharge voltage value of the rechargeable battery. A polarity reversal determination system according to any one of claims 1 to 9 .
11. A controller is provided which is configured to acquire the change in resistance value calculated based on the discharge current value and discharge voltage value of a rechargeable battery, The controller is configured to determine that a polarity reversal has occurred in the rechargeable battery when the amount of change in the resistance value shifts from an increasing trend to a decreasing trend . The controller is configured to determine that the change in the resistance value is on an increasing trend if the latest change in the resistance value is greater than the previous change for at least two consecutive times. Pole reversal detection device.
12. A controller is provided which is configured to acquire the change in resistance value calculated based on the discharge current value and discharge voltage value of a rechargeable battery, The controller is configured to determine that a polarity reversal has occurred in the rechargeable battery when the amount of change in the resistance value shifts from an increasing trend to a decreasing trend . The controller is configured to calculate the amount of change in the resistance value based on the open-circuit voltage of the rechargeable battery, the discharge current value, and the discharge voltage value. Pole reversal detection device.
13. The change in resistance value, calculated based on the discharge current and discharge voltage values of a rechargeable battery, is acquired by the controller . The controller determines that a polarity reversal has occurred in the rechargeable battery when the amount of change in the resistance value shifts from an increasing trend to a decreasing trend, and The controller determines that the change in the resistance value is on an increasing trend if the latest change in the resistance value is greater than the previous change for at least two consecutive times. A method for determining polarity reversal, comprising the following features.
14. The controller obtains the change in resistance value calculated based on the discharge current value and discharge voltage value of the rechargeable battery, and The controller determines that a polarity reversal has occurred in the rechargeable battery when the amount of change in the resistance value shifts from an increasing trend to a decreasing trend. Obtaining the amount of change in the resistance value by the controller includes calculating the amount of change in the resistance value by the controller based on the open-circuit voltage of the rechargeable battery, the discharge current value, and the discharge voltage value. Method for determining polarity reversal.
15. The method for determining the polarity change according to claim 13 or 14 is to be performed by a computer. Pole reversal detection program.
16. The polarity determination program described in claim 15 is stored in A storage medium that can be read by a computer.

Description

The technology disclosed herein relates to a polarity reversal determination system, a polarity reversal determination device, a polarity reversal determination method, a polarity reversal determination program, and a storage medium. Patent Document 1 describes a secondary battery system that predicts and detects the polarity reversal of individual cells in advance. The secondary battery system described in Patent Document 1 calculates the voltage drop rate and determines that polarity reversal has occurred when the rate of decrease exceeds a threshold. Patent Document 2 describes an abnormality detection device that detects polarity reversal based on the internal resistance of a rechargeable battery. The abnormality detection device described in Patent Document 2 determines that polarity reversal has occurred when the internal resistance (ripple resistance) increases and then decreases. For example, the abnormality detection device measures the changing voltage and current every 1 ms during discharge, calculates the cumulative voltage and current values over 10 seconds, and calculates the internal resistance from these values. The abnormality detection device determines an increase in internal resistance by comparing the ratio of internal resistance to a reference internal resistance with a threshold value. The abnormality detection device calculates the internal resistance over a predetermined time and determines that polarity reversal has occurred when the internal resistance increases and then decreases. Japanese Patent Application Publication No. 6-89743International Publication WO2019/131741 Figure 1 is a schematic block diagram of a rechargeable battery polarity determination system.Figure 2 is a graph showing the relationship between voltage, current, resistance, and the change in resistance when polarity reversal occurs in a rechargeable battery.Figure 3 is a schematic block diagram showing the information exchange in the pole reversal determination system shown in Figure 1.Figure 4 is a flowchart showing the pole reversal determination method performed in the pole reversal determination system shown in Figure 1.Figure 5 is a schematic block diagram showing the exchange of information in the polarity reversal determination system according to the first modified example.Figure 6 is a flowchart showing the pole reversal determination method performed in the pole reversal determination system shown in Figure 5.Figure 7 is a schematic block diagram showing the exchange of information in the polarity reversal determination system according to the second modified example.Figure 8 is a flowchart showing the pole reversal determination method performed in the pole reversal determination system shown in Figure 7.Figure 9 is a schematic block diagram showing the exchange of information in the polarity reversal determination system according to the third modified example.Figure 10 is a flowchart showing the pole reversal determination method performed in the pole reversal determination system shown in Figure 9. The embodiments will be described below with reference to the drawings. In the drawings, the same reference numerals indicate corresponding or identical components. As shown in Figure 1, the rechargeable battery 2 is electrically connected to the load 4. The rechargeable battery 2 supplies electricity to the load 4. The rechargeable battery 2 includes, for example, secondary batteries such as lead-acid batteries, lithium-ion batteries, and nickel-metal hydride batteries. Therefore, the rechargeable battery 2 may also be referred to as a secondary battery 2. Load 4 operates on electricity supplied from the rechargeable battery 2. Load 4 includes at least one electrical device. If the rechargeable battery 2 is mounted in a vehicle, examples of electrical devices include an electronic control unit (ECU), lights, heaters, audio equipment, sensors, and cameras. Examples of vehicles include automobiles. Examples of automobiles include automobiles equipped with an engine (internal combustion engine) as a power source, hybrid vehicles equipped with both an engine and a vehicle drive motor as power sources, and electric vehicles or fuel cell vehicles equipped with a vehicle drive motor as a power source. Therefore, for example, the rechargeable battery 2 may be used for vehicle propulsion, or a vehicle drive battery other than the rechargeable battery 2 may be installed in the vehicle. The vehicle is not limited to the vehicles described above. Furthermore, the rechargeable battery 2 may be used for purposes other than vehicles. The rechargeable battery 2 is electrically connected to the charging circuit 6. The charging circuit 6 supplies electricity to the rechargeable battery 2 and charges it. When the rechargeable battery 2 is mounted in a vehicle, for example, the charging circuit 6 includes power generation devices such as an alternator and a vehicle drive motor. Incidentally, in rechargeable battery 2, po