TW202029605A - Battery device and controlling method thereof - Google Patents

Abstract

A battery device and a controlling method are provided. The battery device includes a battery set, a switch set, a first controller, a second controller, a fuse and a self-discharging switch. The switch set is configured to provide a charge and discharge path. The first controller generates and transports a control signal to the switch set. The second controller generates an over-voltage protection signal according to a voltage of the voltage set. The fuse is blown out according to the over-voltage protection signal. The self-discharging switch is turned on to discharge the battery set according to the over-voltage protection signal.

Description

Battery device and control method thereof

The present invention relates to a battery device and a control method thereof, and particularly relates to a battery device and a control method thereof that can improve safety.

With the advancement of electronic technology, electronic products have become essential tools in people's lives. In order to improve the working schedule of electronic products, it is an important issue to provide high-efficiency battery devices.

However, in addition to improving the power supply efficiency of the battery device, the safety of the battery device is an important factor that needs to be considered. Therefore, the expansion of battery cells caused by overcharging is an important issue that must be considered by the designer of battery devices.

The invention provides a battery device and a control method thereof, which can ensure that the battery pack is not damaged due to excessively high storage voltage.

The battery device of the present invention includes a battery pack, a switch pack, a first controller, a second controller, a fuse, and a self-discharge switch. The switch group is coupled to the battery group to provide a charging and discharging path. The first controller is coupled to the battery pack and the switch group, and generates and transmits control signals to the switch group. The second controller is coupled to the battery pack and generates an overvoltage protection signal according to the voltage of the battery pack. The fuse is coupled to the second controller, and is coupled between the switch group and the battery group, and is blown according to the overvoltage protection signal. The self-discharge switch is coupled to the second controller and the battery pack, and is turned on according to the over-voltage protection signal to make the battery pack perform a discharge action.

In an embodiment of the present invention, when the voltage of the battery pack is greater than the preset threshold, the above-mentioned second controller generates an over-voltage protection signal so that the fuse is blown and the self-discharge switch is turned on.

In an embodiment of the present invention, the aforementioned fuse being blown occurs synchronously with the self-discharge switch being turned on.

In an embodiment of the present invention, the above-mentioned second controller discharges the voltage of the battery pack to be equal to the release voltage value through the self-discharge switch.

In an embodiment of the present invention, the aforementioned release voltage value is determined according to the expansion state of the battery pack at the storage temperature.

The control method of the battery device of the present invention includes: providing a first controller to generate and transmit a control signal to the switch group, and enabling the switch group to provide a charging and discharging path; and providing a second controller to generate overvoltage protection according to the voltage of the battery group Signal; provide a fuse to be coupled between the switch group and the battery pack; and make the fuse be blown according to the overvoltage protection signal, and provide a self-discharge switch, so that the self-discharge switch is turned on and causes the The battery pack performs a discharge operation.

Based on the above, the present invention uses the second controller in the battery device to enable the self-discharge switch to be turned on when the fuse in the battery device needs to be blown when the voltage of the battery pack is too high. Through the conduction action of the self-discharge switch, the battery pack can be discharged through the self-discharge switch after the fuse of the battery device is blown. In this way, the stored charge in the battery pack can be discharged, and the voltage of the battery pack can be reduced. Under such conditions, the expansion of the battery pack will be greatly reduced, the probability of damage to the battery pack and the safety of the battery device will be ensured.

In order to make the above-mentioned features and advantages of the present invention more comprehensible, the following specific embodiments are described in detail in conjunction with the accompanying drawings.

Please refer to FIG. 1. FIG. 1 is a schematic diagram of a battery device according to an embodiment of the present invention. The battery device 100 includes a battery pack 110, a switch pack 120, a first controller 130, a second controller 140, a fuse 150, a self-discharge switch 160, a connector 170, and a current sensor 180. The battery pack 110 includes battery cells BC1 to BC3, and is coupled to the fuse 150, the self-discharge switch 160, the first controller 130, the second controller 140, and the current sensor 180. The battery cells BC1 to BC3 included in the battery pack 110 may be coupled in series with each other, or in other embodiments, the battery cells BC1 to BC3 may be coupled in parallel or a combination of series and parallel, and there is no fixed limit.

The switch group 120 is coupled between the fuse 150 and the connector 170. In this embodiment, the switch group 120 includes a charging switch 121 and a discharging switch 122. The charging switch 121 and the discharging switch 122 are connected in series between the fuse 150 and the connector 170, and are respectively controlled by control signals (including the charging control signal CT1 and the discharging control signal CT2). The switch set 120 is used to provide a charge and discharge path between the connector 170 and the battery pack 110 according to the charge control signal CT1 and the discharge control signal CT2.

The connector 170 is used to connect an external device. For example, the connector 170 can be connected to an external electronic device as a load, so that the battery pack 110 performs a discharge action through the switch group 120 to discharge the external electronic device. The connector 170 can also be connected to an external power source, and the external power source can charge the battery pack 110 through the switch group 120. Of course, the above-mentioned external electronic device and the external power supply can belong to the same external device, and there is no certain limitation.

In this embodiment, the first controller 130 is coupled to the battery pack 110, the switch pack 120, the second controller 140, the fuse 150, the connector 170 and the current sensor 180. The first controller 130 can generate the charge control signal CT1 and the discharge control signal CT2, and respectively transmit the charge control signal CT1 and the discharge control signal CT2 to the charge switch 121 and the discharge switch 122 to control the conduction of the charge switch 121 and the discharge switch 122, respectively Or disconnected state. The first controller 130 also detects the working state of the battery pack 110 and receives the voltage CV and temperature CT of each battery cell BC1-BC3 in the battery pack 110. The first controller 130 further receives the detected charging current CC and the detected discharge current DC generated by the current sensor 180. The first controller 130 can generate a charge control signal CT1 and a discharge control signal CT2 to control the battery device 100 according to the obtained voltage CV, temperature CT, detecting charging current CC, and detecting discharge current DC of each battery cell BC1~BC3. Charging and/or discharging action. In addition, the first controller 130 can generate a fuse blow signal BF to blow the fuse when necessary, and thereby cut off the charge and discharge path between the battery pack 110 and the connector 170. Incidentally, the first controller 130 can transmit status information about the battery device 100 to an external device through the connector 170.

On the other hand, the second controller 140 is coupled to the battery pack 110, the first controller 130, the fuse 150 and the self-discharge switch 160. The second controller 140 can receive the voltage CV and the temperature CT of the battery cells BC1 to BC3, and generate an overvoltage protection signal OVP according to the voltage CV. In this embodiment, the overvoltage protection signal OVP can be transmitted to the self-discharge switch 160 and the fuse 150. The overvoltage protection signal OVP is used to blow the fuse 150 and turn on the self-discharge switch 160. Please note here that when the second controller 140 generates the overvoltage protection signal OVP, the fusing action of the fuse 150 and the conducting action of the self-discharge switch 160 can be performed simultaneously.

Please note here that after the fuse 150 is blown due to the overvoltage phenomenon of the battery pack 110, the battery cells BC1~BC3 in the battery pack 110 can discharge through the self-discharge switch 160 that is turned on, and make the battery cell BC1 The amount of charge stored in ~BC3 can be reduced. In this way, the expansion of the battery cells BC1~BC3 due to excessive storage of electricity can be reduced, in addition to avoiding damage to the battery cells BC1~BC3, and the risk of explosion can be avoided.

Please note here that the second controller 140 can generate an overvoltage protection signal OVP when the voltage of the battery pack 110 exceeds a predetermined threshold, and use the overvoltage protection signal OVP to blow the fuse 150 to cut off the charge. Discharge path. In addition, the self-discharge switch 160 is turned on by the overvoltage protection signal OVP, so that the battery pack 110 is discharged. In this embodiment, the battery pack 110 can be discharged through the self-discharge switch 160, and the discharge operation is stopped when the voltage of the battery pack 110 drops to a release voltage value. That is, when the voltage of the battery pack 110 drops to equal to the release voltage value, the second controller 140 turns off the self-discharge switch 160 and stops the discharge action of the battery pack 110.

In this embodiment, the release voltage value can be determined according to the expansion state of the battery pack 110 at a storage temperature, where the expansion state is that the volume change generated by the battery pack 110 at the storage temperature is not more than 10%.

For example, if the voltage of the battery pack 110 is greater than 4.5 volts (V), the second controller 140 generates an over-voltage protection signal OVP to turn on the self-discharge switch 160 and cause the battery pack 110 to discharge. The second controller 140 can turn off the self-discharge switch 160 and stop the discharge action when the voltage of the battery pack 110 drops to 4.2V or 4.1V.

Incidentally, in this embodiment, the hardware architectures of the first controller 130 and the second controller 140 may be processors with computing capabilities, or they may be implemented through hardware description language (Hardware Description Language). , HDL) or any other digital circuit design methods familiar to those with ordinary knowledge in the field, and use Field Programmable Gate Array (FPGA), complex programmable logic device (Complex Programmable Logic Device, CPLD) or a hardware circuit implemented in the form of Application-specific Integrated Circuit (ASIC).

Please refer to FIG. 2 below. FIG. 2 is a schematic diagram of a battery device according to another embodiment of the present invention. The battery device 200 includes a battery pack 210, a switch pack 220, a first controller 230, a second controller 240, a fuse 250, a self-discharge switch 260, and a connector 270. In this embodiment, the switch group 220 includes a charging switch 221, a switch SW1, and a discharging switch 222 constructed by transistors M3 and M4, respectively. The first controller 230 respectively provides a charge control signal CT1 and a discharge control signal CT2 for controlling the transistors M3 and M4. The two ends of the charging switch 221 and the discharging switch 222 are respectively coupled to the first controller 230 through resistors R1 and R2. In addition, the two ends of the charging switch 221 and the discharging switch 222 are provided with capacitors C1 and C2 coupled in series. . The mutual coupling ends of the charging switch 221 and the discharging switch 222 are coupled to the first controller 230 through the diode D1.

On the other hand, in this embodiment, the self-discharge switch 260 is composed of a transistor M1. The transistor M1 is connected in series between the battery pack 210 and the reference ground terminal GND. The control terminal of the transistor M1 also receives the overvoltage protection signal OVP, and is turned on according to the overvoltage protection signal OVP, and provides the battery pack 210 to the reference ground terminal Discharge path of GND. It is worth mentioning that this embodiment further includes a switch SW1. The switch SW1 is connected in series between the center end of the fuse 250 and the reference ground GND. The switch SW1 is constructed by the transistor M2. The control terminal of the transistor M2 receives the overvoltage protection signal OVP, and is turned on according to the overvoltage protection signal OVP. When the switch SW1 is turned on, the center terminal of the fuse 250 is pulled down to be equal to the ground voltage (refer to the voltage on the ground terminal GND), and the fuse 250 is blown.

After the fuse 250 is blown, the self-discharge switch 260 can be continuously turned on, and the voltage of the battery pack 210 is decreased. The conduction state of the self-discharge switch 260 can continue until the voltage of the battery pack 210 is discharged to be equal to the discharge voltage value.

Please refer to FIG. 3 below. FIG. 3 shows a flowchart of a control method of a battery device according to an embodiment of the present invention. Step S310 provides a first controller to generate and transmit control signals to the switch group, and make the switch group provide a charging and discharging path; step S320 provides a second controller to generate an overvoltage protection signal according to the voltage of the battery group; step S330 provides a melting The wire is coupled between the switch group and the battery pack; in step S340, the fuse is blown according to the overvoltage protection signal, and a self-discharge switch is provided, so that the self-discharge switch is turned on according to the overvoltage protection signal and makes the battery pack perform Discharge action.

The implementation details of the foregoing steps have been described in detail in the foregoing embodiments, and will not be repeated here.

In summary, the present invention uses a self-discharge switch to blow the fuse to cut off the charge and discharge path of the battery pack when an overvoltage condition occurs in the battery pack, and the self-discharge switch allows the battery pack to discharge . In this way, the risk of expansion of the battery pack due to storage of excessively high voltage can be reduced, the battery pack can be prevented from being damaged, and the safety of the battery device can be maintained.

Although the present invention has been disclosed in the above embodiments, it is not intended to limit the present invention. Anyone with ordinary knowledge in the technical field can make some changes and modifications without departing from the spirit and scope of the present invention. The scope of protection of the present invention shall be determined by the scope of the attached patent application.

100, 200: battery device 110, 210: battery pack 120, 220: switch group 130, 230: the first controller 140, 240: second controller 150, 250: fuse 160, 260: Self-discharge switch 170, 270: Connector 180: current sensor 121, 221: charging switch 122, 222: discharge switch BC1~BC3: battery cell CT1: charge control signal CT2: discharge control signal CV: Voltage CT: temperature CC: Detect charging current DC: detect discharge current PIFO: job information BF: Fuse blown signal OVP: Overvoltage protection signal M1~M4: Transistor D1: Diode C1, C2: Capacitance R1, R2: resistance SW1: switch S110~S140: Steps of the control method

FIG. 1 is a schematic diagram of a battery device according to an embodiment of the invention. FIG. 2 is a schematic diagram of a battery device according to another embodiment of the invention. FIG. 3 shows a flowchart of a control method of a battery device according to an embodiment of the present invention.

100: battery device

110: battery pack

120: switch group

130: first controller

140: second controller

150: Fuse

160: Self-discharge switch

170: Connector

180: current sensor

BC1~BC3: battery cell

CT1: charge control signal

CT2: discharge control signal

CV: Voltage

CT: temperature

CC: Detect charging current

DC: detect discharge current

PIFO: job information

OVP: Overvoltage protection signal

121: Charging switch

122: Discharge switch

BF: Fuse blown signal

Claims (15)

A battery device includes: A battery pack; A switch group, coupled to the battery group, for providing a charging and discharging path; A first controller, coupled to the battery pack and the switch group, generates and transmits a control signal to the switch group; A second controller, coupled to the battery pack, generates an overvoltage protection signal according to the voltage of the battery pack; A fuse, coupled to the second controller, coupled between the switch group and the battery group, to be blown according to the overvoltage protection signal; and A self-discharge switch is coupled to the second controller and the battery pack, and is turned on according to the over-voltage protection signal to make the battery pack perform a discharge action. According to the battery device described in item 1 of the scope of patent application, when the fuse is blown according to the overvoltage protection signal, the self-discharge switch is turned on according to the overvoltage protection signal. For the battery device described in item 1 of the scope of the patent application, the second controller generates the over-voltage protection signal when the voltage of the battery pack is greater than a predetermined threshold value so that the fuse is blown, and the The self-discharge switch is turned on. According to the battery device described in item 3 of the scope of patent application, the action of the fuse being blown occurs synchronously with the action of the self-discharge switch being turned on. According to the battery device described in claim 1, wherein the second controller discharges the voltage of the battery pack to a release voltage value through the self-discharge switch. As for the battery device described in item 5 of the scope of patent application, the release voltage value is determined according to an expansion state of the battery pack at a storage temperature. As for the battery device described in item 6 of the scope of patent application, the expansion state is that the volume change of the battery pack is not more than 10%. The battery device described in item 1 of the scope of patent application further includes: A connector coupled to the switch group and the first controller; and A current sensor is coupled to the connector, the first controller and the battery pack. A method for controlling a battery device includes: Providing a first controller to generate and transmit a control signal to the switch group, and make the switch group provide a charging and discharging path; Providing a second controller to generate an overvoltage protection signal according to the voltage of the battery pack; Providing a fuse for coupling between the switch pack and the battery pack; and The fuse is fused according to the over-voltage protection signal, and a self-discharge switch is provided, so that the self-discharge switch is turned on according to the over-voltage protection signal and causes the battery pack to discharge. The control method according to item 9 of the scope of patent application, wherein the fuse is fused according to the overvoltage protection signal, and the self-discharge switch is provided so that the self-discharge switch is turned on according to the overvoltage protection signal The steps include: When the fuse is blown according to the overvoltage protection signal, the self-discharge switch is turned on according to the overvoltage protection signal. According to the control method described in claim 10, the step of providing the second controller to generate the overvoltage protection signal according to the voltage of the battery pack includes: When the voltage of the battery pack is greater than a preset threshold value, the second controller is caused to generate the overvoltage protection signal. According to the control method described in item 10 of the scope of patent application, the action of the fuse being blown occurs synchronously with the action of the self-discharge switch being turned on. The control method described in item 9 of the scope of patent application includes: The self-discharge switch discharges the voltage of the battery pack to a discharge voltage value. For example, the control method described in item 13 of the scope of patent application includes: The release voltage value is determined according to an expansion state of the battery pack at a storage temperature. The control method as described in item 14 of the scope of patent application, wherein the expansion state is that the volume change of the battery pack is not more than 10%.

Images