CN-115133605-B - Power supply system and control device

Abstract

The invention provides a power supply system and a control device. The control device (500) is configured to divide a plurality of batteries included in a battery string (St) into a1 St battery (for example, ni-MH) and a2 nd battery (for example, liB). The control device is configured to connect only the 1 st battery among the batteries included in the battery string to the power supply circuit (100, 200, PL1, PL2, PL 3) when a predetermined 1 st condition is satisfied. The control device is configured to connect only the 2 nd battery among the batteries included in the battery string to the power supply circuit when a predetermined 2 nd condition is satisfied.

Inventors

• MITSUI MASAHIKO

Assignees

• 丰田自动车株式会社

Dates

Publication Date

20260512

Application Date

20220323

Priority Date

20210326

Claims (9)

1. 1. A power supply system is provided with: A power supply circuit; a battery string connectable to the power supply circuit, and A control device for controlling the battery string, The battery string includes a plurality of battery circuits connected in series with each other, The plurality of battery circuits each include a battery in a form capable of being connected/disconnected with respect to the power supply circuit, The control device is configured to divide a plurality of batteries included in the battery string into at least a1 st battery and a 2 nd battery, to connect only the 1 st battery among the batteries included in the battery string to the power supply circuit when a predetermined 1 st condition is satisfied, to connect only the 2 nd battery among the batteries included in the battery string to the power supply circuit when a predetermined 2 nd condition is satisfied, The 2 nd cell has smaller output power and larger capacity than the 1 st cell, The 1 st condition is a condition in which the 1 st battery is used alone, and the 2 nd condition is a condition in which the 2 nd battery is used alone.
2. 2. The power supply system according to claim 1, Each of the plurality of battery circuits is configured to include the battery, a1 st switch connected in parallel with the battery, and a2 nd switch connected in series with the battery, wherein the battery is disconnected from the power supply circuit when the 2 nd switch is in an off state, and the battery is connected to the power supply circuit when the 1 st switch is in an off state and the 2 nd switch is in an on state.
3. 3. The power supply system according to claim 2, The plurality of battery circuits included in the battery string include a plurality of 1 st battery circuits each including a battery divided into the 1 st battery, and a plurality of 2 nd battery circuits each including a battery divided into the 2 nd battery, The control device is configured to transmit a1 st control command to the battery string when the 1 st condition is satisfied, transmit a2 nd control command to the battery string when the 2 nd condition is satisfied, When the 1 st control command is received, the battery string drives the 1 st switch and the 2 nd switch of each 1 st battery circuit so as to connect each battery included in the plurality of 1 st battery circuits to the power supply circuit, and when the 2 nd control command is received, drives the 1 st switch and the 2 nd switch of each 2 nd battery circuit so as to connect each battery included in the plurality of 2 nd battery circuits to the power supply circuit.
4. 4. A power supply system according to claim 3, The battery string further includes: a control circuit for generating a switching signal in accordance with a control instruction from the control device; A 1 st driving circuit for driving the 1 st switch and the 2 nd switch of each of the plurality of 1 st battery circuits according to a 1 st switch signal generated by the 1 st control command from the control device or a switch signal obtained by delaying the 1 st switch signal by the control circuit, and And a 2 nd driving circuit that drives the 1 st switch and the 2 nd switch of each of the plurality of 2 nd battery circuits in accordance with a 2 nd switch signal generated by the 2 nd control command from the control device or a switch signal obtained by delaying the 2 nd switch signal by the control circuit.
5. 5. The power supply system according to any one of claim 1 to 4, The 1 st cell is a nickel-hydrogen cell, The 2 nd battery is a lithium ion battery.
6. 6. The power supply system according to any one of claim 1 to 4, The control device may be configured to discharge each of the batteries connected to the power supply circuit in a state where only the 1 st battery among the batteries included in the battery string is connected to the power supply circuit when the 1 st condition is satisfied, and to discharge each of the batteries connected to the power supply circuit in a state where only the 2 nd battery among the batteries included in the battery string is connected to the power supply circuit when the 2 nd condition is satisfied, and to discharge each of the batteries connected to the power supply circuit in a state where both the 1 st battery and the 2 nd battery are connected to the power supply circuit when a predetermined 3 rd condition is satisfied.
7. 7. The power supply system according to claim 6, The control device is configured to repeat charging and discharging of each battery connected to the power supply circuit in a state where at least one of the 1 st battery and the 2 nd battery is connected to the power supply circuit when a predetermined 4 th condition is satisfied.
8. 8. The power supply system according to claim 7, The power supply circuit is configured to be electrically connectable to an external power supply, The control device controls the power supply circuit so that power adjustment of the external power supply is performed using input/output power of the power supply circuit, The control device determines whether or not the 1 st condition, the 2 nd condition, the 3 rd condition, and the 4 th condition are satisfied by using the degree and the adjustment time of the required power adjustment.
9. 9. A control device controls a battery string capable of being connected to a power supply circuit, The battery string includes a plurality of battery circuits connected in series with each other, The plurality of battery circuits each include a battery in a form capable of being connected/disconnected with respect to the power supply circuit, The control device is configured to divide a plurality of batteries included in the battery string into at least a1 st battery and a 2 nd battery, to connect only the 1 st battery among the batteries included in the battery string to the power supply circuit when a predetermined 1 st condition is satisfied, to connect only the 2 nd battery among the batteries included in the battery string to the power supply circuit when a predetermined 2 nd condition is satisfied, The 2 nd cell has smaller output power and larger capacity than the 1 st cell, The 1 st condition is a condition in which the 1 st battery is used alone, and the 2 nd condition is a condition in which the 2 nd battery is used alone.

Description

Power supply system and control device Technical Field The present disclosure relates to a power supply system and a control device, and more particularly, to a technique of controlling a battery string. Background Japanese patent application laid-open No. 2018-074709 discloses a power supply system including a power supply circuit, a battery string connectable to the power supply circuit, and a control device for controlling the battery string. The battery string includes a plurality of battery circuits connected to each other. Each of the plurality of battery circuits includes a battery in a form capable of being connected/disconnected (cut-off) with respect to the power supply circuit. The control device can adjust the output voltage of the battery string to a desired level by controlling the connection/disconnection of the battery. Such a battery string can function as 1 power storage device. Hereinafter, each battery constituting the battery string is also referred to as a "battery element". In the battery string, even if one of the battery elements fails, the failed battery element is disconnected, so that the battery string can normally operate as the power storage device. Disclosure of Invention In recent years, there is a tendency that electric vehicles (xevs such as electric vehicles and plug-in hybrid vehicles) mainly using electric power as a power source are increased from the viewpoint of environmental protection and the like. Therefore, in order to effectively utilize a battery used in an electric vehicle, it is considered to manufacture a battery string using a battery used in an electric vehicle. In the case where different kinds of batteries are used for each vehicle, it is possible to manufacture a battery string using the different kinds of batteries. However, japanese patent application laid-open No. 2018-074709 does not provide a control device suitable for control of a battery string including heterogeneous batteries in a mixed manner (hereinafter also referred to as a "heterogeneous battery mixed string"). The present disclosure has been made to solve the above-described problems, and an object thereof is to provide a control device suitable for controlling a hybrid string of heterogeneous batteries, and a power supply system including such a control device. The power supply system of the present disclosure includes a power supply circuit, a battery string connectable to the power supply circuit, and a control device that controls the battery string. The battery string includes a plurality of battery circuits connected to each other. Each of the plurality of battery circuits includes a battery in a form that can be connected to and disconnected from the power supply circuit. The control device is configured to divide a plurality of batteries included in the battery string into at least a 1 st battery and a 2 nd battery. The control device is configured to connect only the 1 st battery among the batteries included in the battery string to the power supply circuit when a predetermined 1 st condition is satisfied. The control device is configured to connect only the 2 nd battery among the batteries included in the battery string to the power supply circuit when a predetermined 2 nd condition is satisfied. The control device of the present disclosure is a control device that controls a battery string that can be connected to a power supply circuit. The battery string includes a plurality of battery circuits connected to each other. Each of the plurality of battery circuits includes a battery in a form that can be connected to and disconnected from the power supply circuit. The control device is configured to divide a plurality of batteries included in the battery string into at least a1 st battery and a 2 nd battery. The control device is configured to connect only the 1 st battery among the batteries included in the battery string to the power supply circuit when a predetermined 1 st condition is satisfied. The control device is configured to connect only the 2 nd battery among the batteries included in the battery string to the power supply circuit when a predetermined 2 nd condition is satisfied. The control device is configured to selectively connect either the 1 st battery or the 2 nd battery to a power supply circuit. Therefore, the control device can connect only the same type of battery to the power supply circuit when controlling the hybrid string of different types of batteries. The control device can output the power matching the 1 st battery from the power supply circuit or the power matching the 2 nd battery from the power supply circuit. According to the control device, the output characteristics of the battery string can be widely changed. In addition, in the control device, since only the same type of battery can be selectively connected to the power supply circuit, it is possible to appropriately control a hybrid string of different types of batteries including different