# US 2021/0242689 A1 · Charge/discharge control circuit and battery device having the same

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- Number: US 2021/0242689 A1
- Document ID: US20210242689A1
- Status: Published application
- Kind: A1
- Application number: 17/162,024
- Filed: 2021-01-29
- Published: 2021-08-05
- Earliest claimed: 2020-02-03
- Assignees: Ablic Inc.
- Applicants: ABLIC Inc.
- Inventors: Shinya FUKUCHI; Kazuaki SANO
- Web page: https://patentgrep.com/patent/US20210242689A1

## CPC

- H02J 7/52: for charge balancing, e.g. equalisation of charge between batteries
- H02J 7/54: Passive balancing, e.g. using resistors or parallel MOSFETs
- H01M 10/441: {for several batteries or cells simultaneously or sequentially}
- H02J 7/80: including monitoring or indicating arrangements
- H02J 7/933: {the cycle being controlled or terminated in response to electric parameters}
- H01M 2010/4271: {Battery management systems including electronic circuits, e.g. control of current or voltage to keep battery in healthy state, cell balancing}
- Y02E 60/10: Energy storage using batteries
- H02J: ELECTRIC POWER NETWORKS; CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H01M: PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION

## Abstract

A charge/discharge control circuit includes: an output terminal from which a cell-balance control signal is sent to each of the first and the second cell balance circuits; the first and the second voltage detection circuits; a control circuit configured to send the first and the second control signals in accordance with a detection signal received from at least one of the first and the second voltage detection circuits; and an output circuit configured to select one of a voltage of a power supply terminal, a voltage of an input terminal connected to each of a negative electrode of a first battery and a positive electrode of a second battery, and a voltage of a ground terminal in accordance with the first and second control signals, and send the selected voltage to the output terminal.

## Claims

### Claim 1

A charge/discharge control circuit configured to control charging/discharging of a battery device having a first battery and a second battery connected in series; and a first cell balance circuit and a second cell balance circuit connected in parallel to the first battery and the second battery, respectively,
the charge/discharge control circuit, comprising:
a power supply terminal to which a positive electrode of the first battery is connected;
an input terminal to which a negative electrode of the first battery and a positive electrode of the second battery is connected;
a ground terminal to which a negative electrode of the second battery is connected;
an output terminal configured to send a cell-balance control signal to each of the first cell balance circuit and the second cell balance circuit;
a first voltage detection circuit connected between the power supply terminal and the input terminal;
a second voltage detection circuit connected between the input terminal and the ground terminal;
a control circuit configured to send a first control signal and a second control signal in accordance with a detection signal provided from at least one of the first voltage detection circuit and the second voltage detection circuit; and
an output circuit configured to send a selected voltage to the output terminal, the selected voltage being selected from one of a voltage of the power supply terminal, a voltage of the input terminal, and a voltage of the ground terminal in accordance with the first control signal and second control signal.

### Claim 2 (depends on 1)

The charge/discharge control circuit according to claim 1, wherein the output circuit comprises:
a first switch connected between the power supply terminal and the output terminal;
a second switch connected between the ground terminal and the output terminal; and
a current limiting resistor connected between the input terminal and the output terminal.

### Claim 3 (depends on 1)

The charge/discharge control circuit according to claim 1,
wherein the control circuit is configured to further send a third control signal in accordance with the detection signal provided from at least one of the first voltage detection circuit and the second voltage detection circuit, and
wherein the output circuit comprises:
a first switch connected between the power supply terminal and the output terminal;
a second switch connected between the ground terminal and the output terminal; and
a switching circuit connected between the input terminal and the output terminal, and controlled by the third control signal.

### Claim 4 (depends on 1)

A battery device, comprising:
a first battery, a second battery, and charge/discharge control FETs connected in series between a first external terminal and a second external terminal;
a first cell balance circuit and a second cell balance circuit connected in parallel to the first battery and the second battery, respectively; and
the charge/discharge control circuit of claim 1, the charge/discharge control circuit having the output terminal connected to a control terminal of each of the first cell balance circuit and the second cell balance circuit.

### Claim 5 (depends on 2)

A battery device, comprising:
a first battery, a second battery, and charge/discharge control FETs connected in series between a first external terminal and a second external terminal;
a first cell balance circuit and a second cell balance circuit connected in parallel to the first battery and the second battery, respectively; and
the charge/discharge control circuit of claim 2, the charge/discharge control circuit having the output terminal connected to a control terminal of each of the first cell balance circuit and the second cell balance circuit.

### Claim 6 (depends on 3)

A battery device, comprising:
a first battery, a second battery, and charge/discharge control FETs connected in series between a first external terminal and a second external terminal;
a first cell balance circuit and a second cell balance circuit connected in parallel to the first battery and the second battery, respectively; and
the charge/discharge control circuit of claim 3, the charge/discharge control circuit having the output terminal connected to a control terminal of each of the first cell balance circuit and the second cell balance circuit.