# US 2020/0403418 A1 · Charge and discharge circuit

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- Number: US 2020/0403418 A1
- Document ID: US20200403418A1
- Status: Published application
- Kind: A1
- Application number: 16/978,683
- Filed: 2019-12-06
- Published: 2020-12-24
- Earliest claimed: 2018-12-07
- Assignees: Contemporary Amperex Technology Co., Limited
- Applicants: Contemporary Amperex Technology Co., Limited
- Inventors: Zhimin DAN; Jinbo CAI; Wei ZHANG; Yizhen HOU; Xiong ZHENG
- Web page: https://patentgrep.com/patent/US20200403418A1

## CPC

- H02J 7/50: acting upon multiple batteries simultaneously or sequentially
- H02J 7/663: {using battery or load disconnect circuits (H02J9/002 takes precedence)}
- H02J 7/61: against overcharge
- H02J 7/63: against overdischarge
- Y02T 10/70: Energy storage systems for electromobility, e.g. batteries
- H02J: ELECTRIC POWER NETWORKS; CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- Y02T: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION

## Abstract

The present application provides a charge and discharge circuit, and relates to the field of battery power. The charge and discharge circuit comprises: a charge circuit comprising a battery pack, a first switch set and a charging device connected in series; and a discharge circuit comprising the battery pack, a second switch set and an electrical device connected in series; both the first switch set and the second switch set comprise at least one switch, and the at least one switch in the first and/or second switch set is a semiconductor switch.

## Claims

### Claim 1

A charge and discharge circuit, comprising:
a charge circuit comprising a battery pack, a first switch set and a charging device connected in series, wherein the charge circuit is configured to charge the battery pack by using the charging device and pre-charge the charging device; and
a discharge circuit comprising the battery pack, a second switch set and an electrical device connected in series, wherein the discharge circuit is configured to allow the battery pack to discharge to the electrical device and pre-charge the electrical device;
wherein both the first switch set and the second switch set include at least one switch, and all switches in the first switch set and the second switch set are semiconductor switches.

### Claim 2 (depends on 1)

The charge and discharge circuit of claim 1, wherein the charge and discharge circuit further comprises a controller, and the controller is configured to:
send a turn-on signal to a part of switches in the first switch set, and send a pulse signal to another part of the switches in the first switch set to control the part of switches in the first switch set to be turned on and the another part of switches to be turned on at intervals, so as to pre-charge the charging device;
send a turn-on signal to the switches in the first switch set to control the switches in the first switch set to be turned on, so as to allow the charging device to charge the battery pack;
send a turn-on signal to a part of switches in the second switch set, and send a pulse signal to another part of the switches in the second switch set to control the part of switches in the second switch set to be turned on and the another part of switches to be turned on at intervals, so as to pre-charge the electrical device; and
send a turn-on signal to the switches in the second switch set to control the switches in the second switch set to be turned on, so as to allow the battery pack to discharge to the electrical device.

### Claim 3 (depends on 1)

The charge and discharge circuit of claim 1, wherein the first switch set comprises a first switch, a second switch and a third switch,
wherein a first end of the first switch is connected to a negative electrode of the battery pack, a second end of the first switch is connected to a second end of the second switch, a first end of the second switch is connected to one end of the charging device, the other end of the charging device is connected to a first end of the third switch, and a second end of the third switch is connected to a positive electrode of the battery pack;
the second switch set comprises the first switch, the second switch and a fourth switch,
wherein the first end of the second switch is connected to one end of the electrical device, the other end of the electrical device is connected to a second end of the fourth switch, and a first end of the fourth switch is connected to the positive electrode of the battery pack.

### Claim 4 (depends on 3)

The charge and discharge circuit of claim 3, wherein the charge and discharge circuit further comprises a controller, and the controller is configured to:
send a turn-on signal to the first switch and the third switch to control both the first switch and the third switch to be turned on, send a turn-off signal to the fourth switch to control the fourth switch to be turned off, and send a pulse signal to the second switch to control the second switch to be turned on at intervals, so as to pre-charge the charging device;
send a turn-on signal to the first switch and the third switch to control the first switch and the third switch to be turned on, and send a turn-off signal to the fourth switch to control the fourth switch to be turned off, so as to allow the charging device to charge the battery pack;
send a turn-on signal to the first switch and the fourth switch to control the first switch and the fourth switch to be turned on, send a turn-off signal to the third switch to control the third switch to be turned off, and send a pulse signal to the second switch to control the second switch to be turned on at intervals, so as to pre-charge the electrical device;
send a turn-on signal to the first switch, the second switch and the fourth switch to control the first switch, the second switch and the fourth switch to be turned on, and send a turn-off signal to the third switch to control the third switch to be turned off, so as to allow the battery pack to discharge to the electrical device.

### Claim 5 (depends on 1)

The charge and discharge circuit of claim 1, wherein the first switch set comprises a fifth switch and a sixth switch,
wherein a second end of the fifth switch is connected to a positive electrode of the battery pack, a first end of the fifth switch is connected to the other end of the charging device, one end of the charging device is connected to a first end of the sixth switch, and a second end of the sixth switch is connected to a negative electrode of the battery pack;
the second switch set comprises the fifth switch, the sixth switch and a seventh switch, wherein the first end of the fifth switch is connected to a first end of the seventh switch, a second end of the seventh switch is connected to one end of the electrical device, and the other end of the electrical device is connected to a first end of the sixth switch.

### Claim 6 (depends on 5)

The charge and discharge circuit of claim 5, wherein the charge and discharge circuit further comprises a controller, and the controller is configured to:
send a turn-on signal to the fifth switch to control the fifth switch to be turned on, send a turn-off signal to the seventh switch to control the seventh switch to be turned off, and send a pulse signal to the sixth switch to control the sixth switch to be turned on at intervals, so as to pre-charge the charging device;
send a turn-on signal to the fifth switch and the sixth switch to control the fifth switch and the sixth switch to be turned on, and send a turn-off signal to the seventh switch to control the seventh switch to be turned off, so as to allow the charging device to charge the battery pack;
send a turn-on signal to the fifth switch and the seventh switch to control the fifth switch and the seventh switch to be turned on, and send a pulse signal to the sixth switch to control the sixth switch to be turned on at intervals, so as to pre-charge the electrical device; and
send a turn-on signal to the fifth switch, the sixth switch and the seventh switch to control the fifth switch, the sixth switch and the seventh switch to be turned on, so as to allow the battery pack to discharge to the electrical device.

### Claim 7 (depends on 1)

The charge and discharge circuit of claim 1, wherein the second switch set comprises an eighth switch and a ninth switch,
wherein a second end of the eighth switch is connected to a negative electrode of the battery pack, a first end of the eighth switch is connected to one end of the electrical device, the other end of the electrical device is connected to a second end of the ninth switch, and a first end of the ninth switch is connected to a positive electrode of the battery pack;
the first switch set comprises a tenth switch and an eleventh switch,
wherein a second end of the tenth switch is connected to the positive electrode of the battery pack, a first end of the tenth switch is connected to one end of the charging device, a second end of the eleventh switch is connected to the negative electrode of the battery pack, and a first end of the eleventh switch is connected to the other end of the charging device.

### Claim 8 (depends on 7)

The charge and discharge circuit of claim 7, wherein the charge and discharge circuit further comprises a controller, and the controller is configured to:
send a turn-on signal to the tenth switch to control the tenth switch to be turned on, send a turn-off signal to the eighth switch and the ninth switch to control the eighth switch and the ninth switch to be turned off, and send a pulse signal to the eleventh switch to control the eleventh switch to be turned on at intervals, so as to pre-charge the charging device;
send a turn-on signal to the tenth switch and the eleventh switch to control the tenth switch and the eleventh switch to be turned on, and send a turn-off signal to the eighth switch and the ninth switch to control the eighth switch and the ninth switch to be turned off, so as to allow the charging device to charge the battery pack;
send a turn-on signal to the ninth switch to control the ninth switch to be turned on, send a turn-off signal to the tenth switch and the eleventh switch to control the tenth switch and the eleventh switch to be turned off, and send a pulse signal to the eighth switch to control the eighth switch to be turned on at intervals, so as to pre-charge the electrical device; and
send a turn-on signal to the eighth switch and the ninth switch to control the eighth switch and the ninth switch to be turned on, and send turn-off signal to the tenth switch and the eleventh switch to control the tenth switch and the eleventh switch to be turned off, so as to allow the battery pack to discharge to the electrical device.

### Claim 9 (depends on 1)

The charge and discharge circuit of claim 1, wherein the semiconductor switches include a metal oxide semiconductor field effect transistor MOSFET or an insulated gate bipolar transistor IGBT.

### Claim 10 (depends on 9)

The charge and discharge circuit of claim 9, wherein a first end of the MOSFET or the IGBT is a drain, and a second end of the MOSFET or the IGBT is a source.