TW201916521A - Circuit device for series battery pack including a load voltage detector, a battery unit, multiple battery voltage detectors, a boost unit, a switch unit, and a control unit - Google Patents

Abstract

The circuit device for the series battery pack of the present invention is connected to a load end and comprises: a load voltage detector, a battery unit, multiple battery voltage detectors, a boost unit, a switch unit, and a control unit. The control unit is configured to determine an abnormal state of the voltage at the load end detected by the load voltage detector, to determine an abnormal battery in the battery unit according to the detection results of the plurality of battery voltage detectors, to control the switch unit to isolate the abnormal battery so that the remaining batteries that still function normally are reconnected in series for usage, and at the same time to cause the boost unit to amplify the voltage passing through the battery unit to provide the rated voltage required by the load end. As such, the effects of full discharge and stable output are achieved.

Description

 Circuit arrangement for series battery pack  

The present invention relates to a circuit arrangement, and more particularly to a circuit arrangement for isolating a faulty battery in a series battery pack and implementing a voltage gain.

The battery is an electrical energy storage device and is widely used by people. Taking a dry battery as an example, the voltage of the dry battery is generally not high, and is between 1.2 and 3.7V. Since the voltage is too low to be used directly, it is common to connect several cells in series to form a series battery pack 90 (as shown in the first figure) in order to provide a sufficiently high voltage for the load to be used. The series battery pack 90 is widely used in various motor equipment or instruments, whether it is a green energy storage system, an electric vehicle and a notebook power module, a measuring instrument or a home wireless phone and a remote control. The scope, from which the importance is known.

Since the series battery pack 90 has all the batteries connected in series, the output current of each battery is the same when the power is supplied, so theoretically, all the batteries should have the same discharge condition, and the service life is naturally the same. However, in practice, due to factors such as material, temperature, self-discharge rate, and initial charge, the discharge of each battery in the series battery pack 90 may not be exactly the same, some discharge speed is fast, and some discharge speed is slow. Among them, those who discharge faster will inevitably use up power earlier. Moreover, the service life of each battery is not the same, some are long and short, depending on the materials used in the production, the manufacturing technology and the environment in which the battery is located, etc., the shorter service life must first fail. . Unfortunately, when there is a battery failure or power running out of the series battery pack 90, the remaining batteries that are still functioning properly will be affected to reduce their output capability, thus affecting the performance of the load and even making it inoperable. . Therefore, there is a need for improvement.

It is an object of the present invention to provide a circuit device for a series battery pack, by separately isolating the abnormal battery detected in the series battery pack, and reconnecting the remaining batteries that are still in operation, and passing the same The voltage of the series battery pack is used to gain the rated voltage required at the load end to achieve full discharge and stable output.

In order to achieve the above object, the circuit device for connecting a battery pack of the present invention is connected to a load end, and includes: a load voltage detector disposed at the load end for detecting a voltage flowing through the load end, The detected voltage generates and outputs a load voltage signal; a battery unit having the series battery pack connected in series with the plurality of batteries, wherein the positive and negative poles of each battery in the series battery pack are coupled to the first node and the second node respectively a node, the first node forms a discharge path through the corresponding battery to the second node, the first node does not pass the corresponding battery to the second node to form an isolation path; and a plurality of battery voltage detectors are respectively connected to the battery unit The first node and the second node are configured to detect a discharge voltage of each battery, generate and output a plurality of discharge voltage signals based on the detected discharge voltages of the batteries; and a boosting unit coupled to the battery unit Between the load terminals, for boosting the voltage of the series battery pack passing through the battery unit, and outputting the gained voltage to the load end; a switch unit comprising a plurality of a switch, a plurality of second switches, a third switch and a fourth switch, wherein the plurality of first switches are respectively disposed on the discharge path of each battery, and the plurality of second switches are respectively disposed on each of the batteries In the isolation path, the third switch is disposed on a path between the battery unit and the boosting unit, the fourth switch is disposed on a path between the battery unit and the load end; and a control unit The load voltage detector, the plurality of battery voltage detectors, the boosting unit and the switching unit are connected, configured to receive the load voltage signal to determine a voltage abnormal state of the load terminal, and receive the complex discharge voltage signal to determine the series connection An abnormal battery in the battery pack, and a first switch corresponding to controlling the abnormal battery are disconnected and the second switch is closed to separately isolate the abnormal battery, and at the same time, controlling the third switch to be closed and the fourth switch to be turned off, so as to pass The voltage of the battery unit is received by the boosting unit, and the control unit controls the boosting unit to connect the battery pack through the battery unit according to the load voltage signal. Voltage to a nominal gain and the gain of voltage outputs to the load terminal.

1‧‧‧circuit device

2‧‧‧Load voltage detector

3‧‧‧ battery unit

4‧‧‧Battery voltage detector

5‧‧‧Boost unit

6‧‧‧Switch unit

7‧‧‧Control unit

10‧‧‧Load side

20‧‧‧Load voltage signal

30,90‧‧‧Series battery pack

31,32,33,34‧‧‧Battery

35‧‧‧ first node

36‧‧‧second node

37‧‧‧discharge path

38‧‧‧Isolation path

41,42,43,44‧‧‧discharge voltage signal

51‧‧‧ booster

52‧‧‧Boost drive

63‧‧‧third switch

64‧‧‧fourth switch

71‧‧‧First A/D terminal

72‧‧‧Second A/D terminal

73‧‧‧First GND terminal

74‧‧‧second GND terminal

75‧‧‧third GND terminal

76‧‧‧fourth GND terminal

77‧‧‧First PWM terminal

78‧‧‧Second PWM terminal

611,612,613,614‧‧‧ first switch

621,622,623,62‧‧‧second switch

The first figure is a schematic diagram of a series connection of a prior art battery pack.

The second figure is a schematic structural view of a circuit device for a series battery pack according to the present invention.

The third figure is a partial circuit schematic diagram of a circuit device for a series battery pack of the present invention.

Referring to FIG. 2 and FIG. 3 , a preferred embodiment of a circuit device for a series battery pack according to the present invention is connected to the load terminal 10 and includes: a load voltage detector 2 and a battery unit 3 The plurality of battery voltage detectors 4, the boosting unit 5, the switching unit 6, and the control unit 7. The components described in the circuit device 1 will be described below.

The load voltage detector 2 is disposed at the load end 10 for detecting a voltage flowing through the load terminal 10, and generating and outputting a load voltage signal 20 based on the detected voltage.

The battery unit 3 has the series battery pack 30 connected in series with the plurality of batteries 31, 32, 33, 34. The positive and negative poles of each of the batteries 31, 32, 33, 34 of the series battery pack 30 are respectively coupled to the first The node 35 and the second node 36 form a discharge path 37 through the corresponding battery to the second node 36. The first node 35 does not pass the corresponding battery to the second node 36 to form the isolation path 38. It should be noted that, in this example, the number of batteries of the series battery pack 30 is four, but not limited thereto, two or more batteries may be implemented. Moreover, the battery is not limited to a dry battery, and any power storage device having positive and negative poles is also included in the scope of the present invention.

The plurality of battery voltage detectors 4 are respectively connected to the first node 35 and the second node 36 of the battery unit 3 for detecting the discharge voltage of each of the batteries 31, 32, 33, 34, based on the detected The discharge voltages of the batteries 31, 32, 33, 34 generate and output respective complex discharge voltage signals 41, 42, 43, 44.

The boosting unit 5 is coupled between the battery unit 3 and the load terminal 10, and includes a booster 51 and a boost driver 52. The boost driver 52 is configured to receive the command and the drive commanded by the control unit 7. The booster 51 boosts or gains the voltage of the series battery pack 30 passing through the battery unit 3, and then outputs the boosted voltage to the load terminal 10.

The switch unit 6 includes a plurality of first switches 611, 612, 613, 614, a plurality of second switches 621, 622, 623, 624, a third switch 63 and a fourth switch 64, wherein the plurality of first switches 611, 612, 613, 614 are provided one by one in each of the batteries 31, 32, 33, 34 The plurality of second switches 621, 622, 623, 624 are disposed one by one on the isolation path 38 of each of the batteries 31, 32, 33, 34, and the third switch 63 is disposed on the battery unit 3 and the boosting unit. The fourth switch 64 is disposed on the path between the battery unit 3 and the load terminal 10 in the path between the five.

The control unit 7 is a microprocessor comprising two A/D terminals, four GND terminals and two PWM terminals, wherein the first A/D terminal 71 is connected to the plurality of battery voltage detectors 4, the second A The /D terminal 72 is connected to the load voltage detector 2, the first GND terminal 73 is connected to the plurality of battery voltage detectors 4, the second GND terminal 74 is connected to the switch unit 6, and the third GND terminal 75 is connected to the The boosting unit 5, the fourth GND terminal 76 is connected to the load voltage detector 2, the first PWM terminal 77 is connected to the switching unit 6, and the second PWM terminal 78 is connected to the boosting unit 5. The control unit 7 is configured to receive the load voltage signal 20 to determine a voltage abnormal state of the load terminal 10, and receive the complex discharge voltage signals 41, 42, 43, 44 to determine an abnormal battery in the series battery pack 30 (eg, a battery whose fault or power has been used up, and a first switch corresponding to controlling the abnormal battery is disconnected and the second switch is closed to separately isolate the abnormal battery, and at the same time, controlling the third switch 63 to close and the fourth switch 64 It is turned off so that the voltage passing through the battery unit 3 is received by the boosting unit 4. The control unit 7 further controls, according to the load voltage signal 20, the boosting unit 5 to gain the voltage of the series battery pack 30 passing through the battery unit 3 to a rated value, and outputs the boosted voltage to the load end. 10.

It should be added that when another battery 31, 32, 33, 34 fails or the power is exhausted, it is repeated as described above until the last battery is completely used up.

For example, the circuit device 1 for the series battery pack of the present invention determines, by the control unit 7, the abnormal state of the voltage detected by the load voltage detector 2 on the load terminal 10, according to the plurality of battery voltage detectors 4 As a result of the detection, the abnormal battery in the battery unit 3 is determined, and the switch unit 6 is controlled to separately isolate the abnormal battery to allow the remaining batteries that are still in operation to be used in series, and let the boosting unit 5 pass the battery unit 3 The voltage is boosted to provide the desired voltage at the load terminal 10, thereby achieving full discharge and stable output.

Based on the above, the circuit arrangement of the present invention for a series battery pack has the following advantages:

1. Separate the faulty battery separately, it will not be short-circuited, it can be safe, and it can be reconnected with the remaining batteries that can still operate normally and output surplus power to improve energy usage and avoid waste.

Second, combined with switching technology and power conversion technology, the series battery pack that is re-connected can be boosted to the rated value, and the normal voltage is continuously supplied to the load, and the power supply is not interrupted.

Third, the application of voltage detection technology and microprocessor control technology, can immediately detect the battery that has been faulty or has run out of power, to achieve the purpose of fast isolation and re-connected power supply.

Fourth, it can avoid the normal battery in the series battery pack being discarded as a waste battery, reducing the number of discarded batteries and reducing environmental pollution.

In summary, the circuit device for the series battery pack of the present invention can meet the requirements of the invention for the purpose of the invention, but the above is only a preferred embodiment of the present invention, and various modifications and modifications according to the spirit of the present invention are Changes should still be included in the scope of the patent application in this case.

Claims (4)

 A circuit device for connecting a battery pack, connected to a load end, the circuit device comprising: a load voltage detector disposed at the load end for detecting a voltage flowing through the load end, based on the detected The voltage generating and outputting a load voltage signal; a battery unit having the series battery packs connected in series with the plurality of batteries, wherein the positive and negative poles of each of the series battery packs are respectively coupled to the first node and the second node, The first node forms a discharge path through the corresponding battery to the second node, and the first node forms an isolation path without passing the corresponding battery to the second node; and the plurality of battery voltage detectors respectively connect the first of the battery units a node and a second node, configured to detect a discharge voltage of each battery, generate and output a plurality of voltage signals based on the detected discharge voltages of the batteries; and a boosting unit coupled to the battery unit and the load end Between, for gaining the voltage of the series battery through the battery unit, and outputting the gained voltage to the load end; a switching unit comprising a plurality of first switches a plurality of second switches, a third switch and a fourth switch, wherein the plurality of first switches are respectively disposed on the discharge path of each battery, and the plurality of second switches are respectively disposed on the isolation path of each battery The third switch is disposed on a path between the battery unit and the boosting unit, the fourth switch is disposed on a path between the battery unit and the load end, and a control unit is separately connected to the The load voltage detector, the plurality of battery voltage detectors, the boosting unit and the switching unit are configured to receive the load voltage signal to determine a voltage abnormal state of the load end, and receive the plurality of voltage signals to determine the series battery pack An abnormal battery, and a first switch corresponding to controlling the abnormal battery is disconnected and a second switch is closed to separately isolate the abnormal battery, and at the same time, controlling the third switch to be closed and the fourth switch to be turned off, so as to pass the battery unit The voltage is received by the boosting unit, and the control unit controls the boosting unit to perform voltage on the battery pack connected through the battery unit according to the load voltage signal. To a nominal gain and the gain of the voltage is output to the load terminal.    The isolation circuit device for a series battery according to claim 1, wherein the control unit is a microprocessor.    The isolation circuit device for a series battery according to claim 2, wherein the microprocessor comprises two A/D terminals, four GND terminals and two PWM terminals, wherein the first A/D terminal is connected to The plurality of battery voltage detectors, the second A/D terminal is connected to the load voltage detector, the first GND terminal is connected to the plurality of battery voltage detectors, and the second GND terminal is connected to the switch unit, the third GND The terminal is connected to the boosting unit, the fourth GND terminal is connected to the load voltage detector, the first PWM terminal is connected to the switching unit, and the second PWM terminal is connected to the boosting unit.    The circuit device for a series battery pack according to claim 1, wherein the boosting unit includes a booster and a boost driver, and the boost driver is configured to receive the command issued by the control unit and drive the The booster gains a voltage across the series of battery cells of the battery cell.