DE-102025129809-A1 - BATTERY MONITORING DEVICE

Abstract

A battery monitoring device comprises: a SOC sensor for detecting the state of charge (SOC) of a battery; an ambient temperature sensor for detecting the ambient temperature of the battery; a load sensor for detecting a retaining load of the battery; a battery temperature sensor for detecting the temperature of the battery; and a control device that determines an operating cycle of the battery temperature sensor based on the SOC, the ambient temperature, and the retaining load, and operates the battery temperature sensor in the determined operating cycle.

Inventors

• Kazuaki KAMIYA

Assignees

• TOYOTA JIDOSHA KABUSHIKI KAISHA

Dates

Publication Date

20260513

Application Date

20250729

Priority Date

20241112

Claims (5)

1. Battery monitoring device comprising: a state-of-charge (SOC) sensor for detecting the SOC of a battery; an ambient temperature sensor for detecting the ambient temperature of the battery; a load sensor for detecting the battery's retaining load; a battery temperature sensor for detecting the battery's temperature; and a control device that determines an operating cycle of the battery temperature sensor based on the SOC, the ambient temperature, and the retaining load, and operates the battery temperature sensor in the determined operating cycle.
2. Battery monitoring device according to Claim 1 , wherein the control device calculates a first variable based on the SOC, a second variable based on the ambient temperature, a third variable based on the retention load, and increases the duty cycle as the sum of the first variable, the second variable, and the third variable.
3. Battery monitoring device according to Claim 2 , wherein the control device sets the first variable to a first value when the SOC is in a first range, sets the first variable to a second value that is less than the first value when the SOC is in a second range that is greater than the first range, and sets the first variable to a third value that is less than the second value when the SOC is in a third range that is greater than the second range.
4. Battery monitoring device according to Claim 2 , wherein the control device sets the second variable to a first value when the ambient temperature is in a first range, sets the second variable to a second value that is less than the first value when the ambient temperature is in a second range that is greater than the first range, and sets the second variable to a third value that is less than the second value when the ambient temperature is in a third range that is greater than the second range.
5. Battery monitoring device according to Claim 2 , wherein the control device sets the third variable to a first value when the restraint load is in a first range, sets the third variable to a second value that is less than the first value when the restraint load is in a second range that is greater than the first range, and sets the third variable to a third value that is less than the second value when the restraint load is in a third range that is greater than the second range.

Description

BACKGROUND OF THE INVENTION 1. Field of the invention The present disclosure relates to a battery monitoring device. 2. Description of the state of the art The JP 2021-036485 ( JP 2021-036485 A) describes a method for cooling a power supply device, the method comprising: sensing a state of charge (SOC) and ambient temperature of a battery, determining whether a predetermined temperature evaluation criterion is met, based on the sensed SOC and temperature, and operating a cooling mechanism that cools the battery when it is determined that the temperature evaluation criterion is not met. BRIEF OVERVIEW OF DETECTION The one in JP 2021-036485 The described cooling method uses only the battery's SOC and ambient temperature for temperature evaluation, and there is room for improvement in terms of accuracy. There is a problem in that the risk of smoke development increases if the interval for detecting the battery temperature is long, and that power consumption increases if the interval for detecting the battery temperature is long. The objective of the present disclosure is to provide a battery monitoring device that can detect the temperature of a battery at appropriate times. One aspect of the present disclosure provides a battery monitoring device comprising: a state-of-charge (SOC) sensor for detecting the SOC of a battery; an ambient temperature sensor for detecting the ambient temperature of the battery; a load sensor for detecting a retaining load of the battery; a battery temperature sensor for detecting the temperature of the battery; and a control device that determines an operating cycle of the battery temperature sensor based on the SOC, the ambient temperature, and the retaining load, and operates the battery temperature sensor in the determined operating cycle. According to the present disclosure, the temperature of a battery can be recorded at suitable times. BRIEF DESCRIPTION OF THE DRAWINGS The following describes the features, advantages, and technical and industrial significance of exemplary embodiments of the invention with reference to the accompanying drawings, in which the same reference numerals denote the same elements and wherein: 1 schematically shows the overall configuration of a vehicle equipped with a battery cooling device according to one embodiment; 2A An example of the risk of smoke development from a battery is shown in Figure 5; 2B an example of the risk of smoke development from battery 5 shows; 2C An example of the risk of smoke development from battery 5 is shown; 3 An example of temperature control TB of battery 5 is shown; and 4 This is a flowchart that shows the procedure for controlling the monitoring of battery 5. DETAILED DESCRIPTION OF EXECUTION FORMS One embodiment is described below with reference to the drawings. 1 Figure 1 schematically shows the overall configuration of a vehicle equipped with a battery cooling device according to one embodiment. For example, vehicle 1 is a battery-powered electric vehicle. Vehicle 1 is designed to be externally rechargeable (so-called plug-in charging), with current being supplied to vehicle 1 from a charger (not shown) to charge a vehicle battery 5. It is not essential that vehicle 1 be designed to be externally rechargeable. Vehicle 1 can be a conventional hybrid electric vehicle that is not externally rechargeable. The vehicle 1 comprises an inlet 2, charging lines PL1, NL1, a voltage sensor 31, a current sensor 32, charging relays 41, 42, system main relays (SMRs) 43, 44, power lines PL2, NL2, the 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 (PCU) 81, a motor generator 82, a Power transmission gearbox 83, drive wheels 84 and an 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 form a battery monitoring device 200. The inlet (charging port) 2 is designed to allow the insertion of a connector or plug (not shown) of a charging cable with a mechanical coupling, e.g. a plug connector. The voltage sensor 31 is electrically connected between charging line PL1 and charging line NL1, on the side of inlet 2 with respect to the charging relay 41. The voltage sensor 31 detects a DC voltage between charging line PL1 and charging line NL1 and outputs the detection result to the ECU 10. The current sensor 32 is, for example, located in charging line PL1. The current sensor 32 detects a current flowing through charging line PL1 and outputs the detection result to the ECU 10. The ECU 10 can calculate the power supplied by a charger (not shown) (the amount of charge in battery 5) based on the detection results from the voltage sensor 31 and the current sensor 32. Charging relay 41 is connected to charging line PL1, and charging relay 42 is connected to charging line NL1. The opening and closing of charging relay