CN-115117475-B - Battery management system and battery management method

Abstract

A battery management system and a battery management method are provided. The battery storage (2) is provided with a battery group that includes a plurality of batteries, a power conversion device (an AC/DC converter (22) and a DC/DC converter (23)) that are electrically connected between the plurality of batteries and the power system (5), and a server (20) that controls the operation of the power conversion device in response to a DR request from the power system (5) so as to charge and discharge the plurality of batteries. The battery group includes a low operation group and a high operation group, and the number of classes included in the high operation group among the classes related to the degree of degradation of the battery is equal to or less than the number of classes included in the low operation group. The server (20) suppresses charging and discharging of the plurality of batteries included in the low operation group compared to charging and discharging of the plurality of batteries included in the high operation group. The stock of batteries of each class can be ensured.

Inventors

• Quan Chuntai
• OMURA KENJI
• HABU MASAKAZU
• Sufu seinosuke
• MURAMATSU MAKITO

Assignees

• 丰田自动车株式会社

Dates

Publication Date

20260512

Application Date

20220322

Priority Date

20210323

Claims (6)

1. 1. A battery management system is provided with: a battery group including a plurality of batteries; a power conversion device electrically connected between the plurality of batteries and a power system; A control device for controlling the operation of the power conversion device in response to a demand response request from the power system so as to charge and discharge the plurality of batteries included in the battery group, and A switching device configured to be capable of switching between electrical connection and electrical disconnection between the plurality of batteries and the power system, The battery group includes a1 st battery group and a 2 nd battery group, the number of classes included in the 2 nd battery group among classes related to the degree of degradation of the battery is equal to or less than the number of classes included in the 1 st battery group, The control device suppresses charge and discharge of the plurality of batteries included in the 1 st battery group compared with charge and discharge of the plurality of batteries included in the 2 nd battery group, Regarding each battery of the 1 st battery group having a small degradation level, it is determined whether or not the SOC of the battery is within a SOC range in which degradation of the battery progresses slowly, the SOC range being determined in advance to be 40% -60% in accordance with the characteristics of the battery, In the case where the SOC of the battery among the battery of the class 1 having the small degree of degradation is within the SOC range in which the degradation progresses slowly, the control means controls the switching means so that the battery is electrically disconnected from the electric power system.
2. 2. The battery management system of claim 1, The control device suppresses charge and discharge of the battery included in the 1 st battery group as compared with charge and discharge of the battery included in the 2 nd battery group when the SOC of the battery included in the 1 st battery group is within a predetermined SOC range in which progress of degradation can be suppressed.
3. 3. The battery management system of claim 1, The control device makes the charge/discharge electric quantity of the battery contained in the 1 st battery group in a preset period smaller than the charge/discharge electric quantity of the battery contained in the 2 nd battery group in the preset period.
4. 4. The battery management system of claim 1, The control device sets the charge/discharge frequency of the battery included in the 1 st battery group to be lower than the charge/discharge frequency of the battery included in the 2 nd battery group.
5. 5. The battery management system of claim 1, The 1 st battery group includes all the battery levels.
6. 6. A method of managing a battery of a battery pack, is a battery management method using a server, Comprising a step in which the server charges and discharges a plurality of batteries included in a battery group according to a demand response request from a power system, The battery group includes a1 st battery group and a 2 nd battery group, the number of classes included in the 2 nd battery group among classes related to the degree of degradation of the battery is equal to or less than the number of classes included in the 1 st battery group, The step of charging and discharging includes the step of suppressing charge and discharge of the plurality of batteries included in the 1 st battery group as compared with charge and discharge of the plurality of batteries included in the 2 nd battery group, In the method of management of a battery in the present invention, Regarding each battery of the 1 st battery group having a small degradation level, it is determined whether or not the SOC of the battery is within a SOC range in which degradation of the battery progresses slowly, the SOC range being determined in advance to be 40% -60% in accordance with the characteristics of the battery, When the SOC of the battery of the class 1 battery group having a small degree of degradation is within the SOC range in which degradation progresses slowly, the battery is electrically disconnected from the power system.

Description

Battery management system and battery management method Technical Field The present disclosure relates to a battery management system and a battery management method. Background Japanese patent application laid-open No. 2018-205873 describes that a user of an electric vehicle having a battery suitable for an electric power storage system is urged to replace the battery. Disclosure of Invention In recent years, the popularity of vehicles having a running battery pack mounted thereon has rapidly progressed. Therefore, the number of second-hand batteries that are recovered in connection with replacement, disassembly, and the like of these vehicles is increasing. From the viewpoint of advancing the goal of sustainable development (SDGs: sustainable Development Goals), it is desirable to manufacture a new battery pack using the recovered second-hand battery and reuse the second-hand battery. The inventors focused on the following problems that may occur when recycling the second-hand battery. The battery is stored in a physical distribution point or the like while waiting for use. Costs are incurred to properly store the battery. In addition, a certain amount of time (during storage) may be required from the time of storing the collected batteries until the time of leaving the battery for use. Therefore, it is desirable to effectively use the storage period of the battery. Consider a battery rated according to the degree of degradation of the battery. The required rank (rank) also varies depending on the application and the like to be used. Thus, there may be a relatively high level of demand, on the other hand, a relatively low level of demand. For the battery management system, it is desirable to secure, as an inventory, the number of batteries corresponding to the demand of use, for each level. On the other hand, it is not possible to adjust what class of batteries are collected from the market on the battery management system side. In addition, during the storage period of the battery management system, degradation of the battery also progresses, and the grade may be lowered accordingly. Thus, a bias may occur in the level of the battery in stock. The present disclosure has been made to solve the above-described problems, and an object of the present disclosure is to ensure stock of batteries of respective grades. (1) The battery management system according to an aspect of the present disclosure includes a battery group including a plurality of batteries, a power conversion device electrically connected between the plurality of batteries and a power system, and a control device that controls an operation of the power conversion device in response to a demand response request from the power system, thereby charging and discharging the plurality of batteries included in the battery group. The battery group includes a1 st battery group and a2 nd battery group, and the number of class types included in the 2 nd battery group among the classes related to the degree of degradation of the battery is equal to or less than the number of class types included in the 1 st battery group. The control device suppresses charge and discharge of the plurality of batteries included in the 1 st battery group compared with charge and discharge of the plurality of batteries included in the 2 nd battery group. In the configuration of (1) above, the charge and discharge of the plurality of batteries included in the 1 st battery group are suppressed as compared with the charge and discharge of the plurality of batteries included in the 2 nd battery group, and the number of the class types included in the 2 nd battery group among the classes related to the degree of degradation of the batteries is equal to or less than the number of the class types included in the 1 st battery group. Therefore, the grade of the battery of each grade included in the 1 st battery group is maintained as compared with the grade of the battery of the 2 nd battery group. As a result, the stock of batteries of each class can be ensured. (2) The battery management system further includes a switching device configured to be capable of switching between electrical connection and electrical disconnection between the plurality of batteries and the power system. The control device controls the switching device such that the battery included in the 1 st battery group is electrically disconnected from the power system. In the configuration of (2) above, the battery included in the 1 st battery group is electrically disconnected from the power system. Therefore, the level of the battery included in the 1 st battery group can be maintained more reliably. (3) When the SOC of the battery included in the 1 st battery group is within a predetermined SOC range in which the progress of degradation can be suppressed, the control device suppresses charge and discharge of the battery included in the 1 st battery group as compared with charge and discharge of the battery inclu