Search

CN-122008956-A - Vehicle and method for estimating deterioration of battery

CN122008956ACN 122008956 ACN122008956 ACN 122008956ACN-122008956-A

Abstract

The vehicle of the present invention includes a motor generator for running, a PCU that drives the motor generator, a main battery that is charged and discharged by the PCU when the vehicle is used, and a processor. The processor is configured to calculate an amount of energization degradation of the main battery by performing the energization degradation process using the amount of energization of the main battery when the vehicle is in use, and to calculate a placement degradation amount of the main battery by performing a placement degradation process using a placement time of the main battery when the vehicle is in place, and to estimate a degradation degree of the main battery based on a sum of the amount of energization degradation and the placement degradation amount. Even when the vehicle is in use, the processor executes the placement degradation process when the energization amount is lower than the reference amount.

Inventors

  • YOKO NODA

Assignees

  • 丰田自动车株式会社

Dates

Publication Date
20260512
Application Date
20251016
Priority Date
20241111

Claims (5)

  1. 1. A vehicle is characterized in that, The vehicle is provided with: A motor generator for running; A driving device for driving the motor generator; a storage battery charged and discharged by the driving device when the vehicle is running, and A processor that, when the vehicle is used, performs an energization degradation process that uses an energization amount of the battery to calculate an energization degradation amount of the battery, and when the vehicle is placed, performs a placement degradation process that uses a placement time of the battery to calculate a placement degradation amount of the battery, and estimates a degradation degree of the battery based on a sum of the energization degradation amount and the placement degradation amount, The processor executes the placement degradation process when the energization amount is lower than a reference amount even when the vehicle is in use.
  2. 2. The vehicle of claim 1, wherein the vehicle is a vehicle, The processor is configured to: in the energization degradation process, an amount obtained by multiplying a square root of the energization amount by an energization degradation rate of the battery is calculated for each temperature of the battery, the calculated amounts are added for all temperatures, thereby calculating the energization degradation amount, In the storage battery placement degradation process, the amount obtained by multiplying the square root of the placement time by the storage battery placement degradation rate is calculated for each temperature and SOC of the storage battery, and the placement degradation amount is calculated by adding the calculated amounts for all temperatures and all SOCs.
  3. 3. The vehicle of claim 2, wherein the vehicle is further characterized in that, The processor calculates a current capacity maintenance rate of the battery as the degree of degradation by subtracting a square root of the sum from a capacity maintenance rate before degradation of the battery.
  4. 4. A vehicle according to any one of claim 1 to 3, wherein, The vehicle further includes: An auxiliary battery; a charging device that charges the auxiliary battery with electric power supplied from the storage battery; Power supply port, and A power supply device that supplies power to the outside of the vehicle through the power supply port by using the power supplied from the battery, The processor is configured to execute the energization degradation process based on a case where the energization amount is equal to or larger than the reference amount when the driving device is operated, and to execute the placement degradation process based on a case where the energization amount is lower than the reference amount when the charging device or the power feeding device is operated.
  5. 5. A method for estimating deterioration of a battery mounted on a vehicle, characterized by, The method for estimating the deterioration of the battery includes the step of estimating the degree of deterioration of the battery by a processor, The step of estimating includes: a step of executing, when the vehicle is used, an energization degradation process that uses an energization amount of the battery to calculate an energization degradation amount of the battery; a step of performing a placement degradation process using a placement time of the battery to calculate a placement degradation amount of the battery at the time of placement of the vehicle; A step of executing the placement degradation process when the energization amount is lower than a reference amount even when the vehicle is in use, and Estimating the degradation degree based on a sum of the energization degradation amount and the placement degradation amount.

Description

Vehicle and method for estimating deterioration of battery Technical Field The present disclosure relates to a degradation estimation method of a vehicle and a battery. Background Japanese patent application laid-open No. 2019-53074 discloses a degradation estimation device capable of estimating degradation of an electric storage element with high accuracy. The degradation estimation device is provided with an acquisition unit and an estimation unit. The acquisition unit acquires time-series data Of an SOC (State Of Charge) in the power storage element. The estimating unit calculates an energization degradation value indicating degradation caused by energization of the power storage element using a coefficient based on a magnitude of variation in the SOC in the time-series data acquired by the acquiring unit, and estimates degradation of the power storage element based on a sum of the calculated energization degradation value and a non-energization degradation value indicating degradation not caused by energization of the power storage element. There is a demand for estimating the degradation degree of a battery mounted on a vehicle with high accuracy. The present inventors focused on estimating the degradation degree of a battery by dividing the degradation caused by the current supply and the degradation not caused by the current supply, and the accuracy of estimating the degradation degree was liable to be low under certain conditions. Disclosure of Invention The present disclosure has been made to solve the above-described problems, and an object of the present disclosure is to improve the accuracy of estimating the degradation degree of a battery mounted on a vehicle. A vehicle according to a first aspect of the present disclosure includes a motor generator for running, a driving device that drives the motor generator, a battery that is charged and discharged by the driving device when the vehicle is used, and a processor. The processor is configured to calculate an amount of current-carrying degradation of the battery by performing current-carrying degradation processing using the amount of current-carrying of the battery when the vehicle is in use, and to estimate a degree of degradation of the battery based on a sum of the amount of current-carrying degradation and the amount of placement degradation by performing placement degradation processing using a placement time of the battery when the vehicle is in place. Even when the vehicle is in use, the processor executes the placement degradation process when the energization amount is lower than the reference amount. A method for estimating degradation of a battery according to a second aspect of the present disclosure is a method for estimating degradation of a battery mounted on a vehicle, and includes a step of estimating a degree of degradation of a battery by a processor. The estimating step includes a step of performing an energization degradation process using an energization amount of the battery to calculate an energization degradation amount of the battery when the vehicle is in use, a step of performing a placement degradation process using a placement time of the battery to calculate a placement degradation amount of the battery when the vehicle is in use, a step of performing a placement degradation process even when the energization amount is lower than a reference amount when the vehicle is in use, and a step of estimating a degradation degree based on a sum of the energization degradation amount and the placement degradation amount. According to the present disclosure, the accuracy of estimating the degree of degradation of the battery mounted on the vehicle can be improved. 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 numerals denote like elements, wherein, Fig. 1 is a block diagram showing an example of the overall configuration of a vehicle according to the present embodiment; Fig. 2 is a diagram for explaining the energization degradation coefficient and the placement degradation coefficient; Fig. 3 is a diagram for explaining the reason why the error in the amount of current-carrying deterioration occurs; fig. 4 is a flowchart showing an example of the processing procedure of the degradation estimation processing in the present embodiment. FIG. 5 is a diagram showing a running simulation mode for determining the power-on degradation coefficient, and Fig. 6 is a diagram illustrating the energization degradation coefficient and the placement degradation coefficient. Detailed Description Embodiments of the present disclosure will be described in detail below with reference to the drawings. In the drawings, the same or corresponding portions are denoted by the same reference numerals, and description thereof will not be repeated. Description of the embodiments Vehicle structur