CN-122017620-A - Battery monitoring device

Abstract

The battery monitoring device includes an SOC sensor that detects an SOC of a battery, an ambient temperature sensor that detects an ambient temperature of the battery, a load sensor that detects a restraint load of the battery, a battery temperature sensor that detects a temperature of the battery, and an ECU that determines an operation cycle of the battery temperature sensor based on the SOC, the ambient temperature, and the restraint load, and operates the battery temperature sensor in the determined operation cycle.

Inventors

• Shengu Yizhang

Assignees

• 丰田自动车株式会社

Dates

Publication Date

20260512

Application Date

20250927

Priority Date

20241112

Claims (5)

1. 1. A battery monitoring device comprising: A state of charge (SOC) sensor that detects an SOC of the battery; An ambient temperature sensor that detects an ambient temperature of the battery; A load sensor that detects a restraining load of the battery; a battery temperature sensor that detects a temperature of the battery, and A control device that determines an operation cycle of the battery temperature sensor based on the SOC, the ambient temperature, and the constraint load, and operates the battery temperature sensor in the determined operation cycle.
2. 2. The battery monitoring device according to claim 1, wherein the control device calculates a first variable based on the SOC, calculates a second variable based on the ambient temperature, calculates a third variable based on the constraint load, and increases the operation period as a sum of the first variable, the second variable, and the third variable is larger.
3. 3. The battery monitoring device according to claim 2, wherein the control device sets the first variable to a first value when the SOC is within a first range, sets the first variable to a second value smaller than the first value when the SOC is within a second range that is larger than the first range, and sets the first variable to a third value smaller than the second value when the SOC is within a third range that is larger than the second range.
4. 4. The battery monitoring device according to claim 2, wherein the control device sets the second variable to a first value when the ambient temperature is within a first range, sets the second variable to a second value smaller than the first value when the ambient temperature is within a second range that is larger than the first range, and sets the second variable to a third value smaller than the second value when the ambient temperature is within a third range that is larger than the second range.
5. 5. The battery monitoring device according to claim 2, wherein the control device sets the third variable to a first value when the constraint load is within a first range, sets the third variable to a second value smaller than the first value when the constraint load is within a second range that is larger than the first range, and sets the third variable to a third value smaller than the second value when the constraint load is within a third range that is larger than the second range.

Description

Battery monitoring device Technical Field The present disclosure relates to battery monitoring devices. Background Japanese unexamined patent application publication (JP 2021-036485, 036485A) describes a method Of cooling an electric power supply device, the method including detecting a State Of Charge (SOC) and an ambient temperature Of a battery, determining whether a predetermined temperature evaluation criterion is satisfied based on the detected SOC and temperature, and operating a cooling mechanism that cools the battery when it is determined that the temperature evaluation criterion is not satisfied. Disclosure of Invention The cooling method described in JP 2021-036485A uses only the SOC of the battery and the ambient temperature for temperature evaluation, and there is room for improvement in terms of improving accuracy. There are problems in that the risk of smoke generation increases when the interval of detecting the battery temperature is long, and in that the power consumption increases when the interval of detecting the battery temperature is long. An object of the present disclosure is to provide a battery monitoring device capable of detecting the temperature of a battery at an appropriate timing. An aspect of the present disclosure provides a battery monitoring device including a state of charge (SOC) sensor detecting an SOC of a battery, an ambient temperature sensor detecting an ambient temperature of the battery, a load sensor detecting a constraint load of the battery, a battery temperature sensor detecting a temperature of the battery, and a control device determining an operation cycle of the battery temperature sensor based on the SOC, the ambient temperature, and the constraint load, and operating the battery temperature sensor in the determined operation cycle. According to the present disclosure, the temperature of the battery can be detected at an appropriate timing. Drawings Features, advantages, and technical and industrial significance of exemplary embodiments of the present invention will be described below with reference to the accompanying drawings, in which like symbols represent like elements, and in which: Fig. 1 schematically shows an overall configuration of a vehicle provided with a battery cooling device according to an embodiment; fig. 2A shows an example of the risk of smoke generation from the battery 5; fig. 2B shows an example of the risk of smoke generation from the battery 5; fig. 2C shows an example of the risk of smoke generation from the battery 5; Fig. 3 shows an example of the check of the temperature TB of the battery 5, and Fig. 4 is a flowchart showing a process for controlling the monitoring of the battery 5. Detailed Description Embodiments will be described below with reference to the drawings. Fig. 1 schematically shows an overall configuration of a vehicle provided with a battery cooling device according to an embodiment. The vehicle 1 is, for example, a pure electric vehicle (battery ELECTRIC VEHICLE). The vehicle 1 is configured to allow external charging (so-called plug-in charging) in which electric power is supplied from a charger (not shown) to the vehicle 1 to charge the in-vehicle battery 5. It is not necessary that the vehicle 1 should be configured to be externally chargeable. The vehicle 1 may be a normal hybrid electric vehicle that is not externally chargeable. The vehicle 1 includes an inlet 2, charging lines PL1, NL1, a voltage sensor 31, a current sensor 32, charging relays 41, 42, system main relays (SYSTEM MAIN RELAY, SMR) 43, 44, power lines PL2, NL2, a battery 5, a state of charge (SOC) sensor 61, an ambient temperature sensor 63, a load sensor 62, a battery temperature sensor 64, a cooling device 7, a power control unit (Power Control Unit, PCU) 81, a motor generator 82, a power transmission gear 83, driving wheels 84, and an electronic control unit (Electronic Control Unit, ECU) 10. The SOC sensor 61, the ambient temperature sensor 63, the load sensor 62, the battery temperature sensor 64, and the ECU 10 constitute a battery monitoring device 200. The inlet (charging port) 2 is configured as a connector (not shown) capable of plugging in a charging cable using a mechanical coupling such as mating. Voltage sensor 31 is electrically connected between charging line PL1 and charging line NL1 on the inlet 2 side with respect to charging relay 41. Voltage sensor 31 detects a Direct Current (DC) voltage between charging line PL1 and charging line NL1, and outputs the detection result to ECU 10. The current sensor 32 is provided in the charging line PL1, for example. The current sensor 32 detects the current flowing through the charging line PL1, and outputs the detection result to the ECU 10. The ECU 10 may calculate the electric power (the charge amount of the battery 5) supplied from a charger (not shown) based on the detection results from the voltage sensor 31 and the current sensor 32. Charging relay 41 is connected to chargin