CN212210526U - Battery power supply device - Google Patents
Battery power supply device Download PDFInfo
- Publication number
- CN212210526U CN212210526U CN202020572864.1U CN202020572864U CN212210526U CN 212210526 U CN212210526 U CN 212210526U CN 202020572864 U CN202020572864 U CN 202020572864U CN 212210526 U CN212210526 U CN 212210526U
- Authority
- CN
- China
- Prior art keywords
- resistor
- circuit
- switch
- switch circuit
- diode
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Landscapes
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The utility model is suitable for the technical field of batteries, in particular to a battery power supply device, which comprises a battery pack, a first switch circuit, a second switch circuit, a first switch detection circuit, a second switch detection circuit and a control circuit, wherein the battery power supply device respectively outputs a turn-on signal or a turn-off signal to the first switch circuit and the second switch circuit before discharging, determines the working states of the first switch circuit and the second switch circuit according to the first switch detection circuit and the second switch detection circuit, controls the battery pack to discharge and controls the first switch circuit and the second switch circuit to be correspondingly turned on when the first switch circuit and the second switch circuit are normal, controls the battery pack to stop discharging when the first switch circuit and the second switch circuit are detected to be abnormal, reports a fault to a background, the first switch circuit and the second switch circuit are used as an external switch circuit to carry out high-voltage protection on a switch tube of a BMS protection board, the overall safety of the battery pack is improved.
Description
Technical Field
The utility model belongs to the technical field of the battery, especially, relate to a battery power supply unit.
Background
Traditional group battery carries out series output through group battery and supporting BMS protection shield to provide power supply for the load, but the withstand voltage of the switch tube of BMS protection shield is limited, and when the power supply in-process was closed because of individual battery cell or BMS protection shield are unusual, the voltage of applying the switch tube at this BMS protection shield was too high, and the switch tube of BMS protection shield has the danger of high-pressure burnout.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a battery power supply unit aims at solving traditional BMS protection shield and has the problem that high pressure burns out.
A first aspect of an embodiment of the present invention provides a battery power supply apparatus, which includes a battery pack, a first switch circuit, a second switch circuit, a first switch detection circuit, a second switch detection circuit, and a control circuit;
the first end of the battery pack is connected with the input end of a load, the output end of the load, the input end of the second switch circuit and the signal input end of the second switch detection circuit are interconnected, the output end of the second switch circuit, the input end of the first switch circuit and the signal input end of the first switch detection circuit are interconnected, the output end of the first switch circuit and the second end of the battery pack are connected and grounded, the controlled end of the first switch circuit, the controlled end of the second switch circuit, the signal output end of the first switch detection circuit and the signal output end of the second switch detection circuit are respectively connected with the signal end of the control circuit, the battery pack comprises a plurality of BMS protection boards and a plurality of single batteries, the BMS protection boards are sequentially connected in series, and each BMS protection board is connected with at least one single battery, the controlled end of each BMS protection board is also connected with the signal end of the control circuit;
the control circuit is configured to:
respectively outputting a turn-on signal and a turn-off signal to the first switch circuit and respectively outputting a turn-on signal and a turn-off signal to the second switch circuit before controlling the BMS protection boards to discharge, and determining the working states of the first switch circuit and the second switch circuit according to level signals fed back by the first switch detection circuit and the second switch detection circuit;
when the working states of the first switch circuit and the second switch circuit are determined to be normal, the BMS protection boards are controlled to discharge, the first switch circuit is controlled to be normally on, the second switch circuit is controlled to be switched on and off so as to output and control the power supply output by the battery pack, and the first switch circuit is controlled to be switched on and off so as to output and control the power supply output by the battery pack when the second switch circuit is short-circuited;
and when the first switch circuit and/or the second switch circuit are/is determined to be in a short-circuit state or an open-circuit state, controlling each BMS protection board to stop discharging and reporting the fault to a background.
In one embodiment, the first switching circuit comprises a first electronic switching tube and the second switching circuit comprises a second electronic switching tube.
In one embodiment, the first switch detection circuit comprises a first resistor, a second resistor, a third resistor, a first diode, a second diode and a first optocoupler;
the anode of the first diode is connected with a first positive power supply end, the cathode of the first diode is connected with a first end of a first resistor, the second end of the first resistor is connected with the anode of the first optocoupler, the cathode of the first optocoupler is connected with the anode of a second diode, the cathode of the second diode is a signal input end of the first switch detection circuit, the collector of the first optocoupler, the first end of the second resistor and the first end of the third resistor are interconnected, the second end of the second resistor is connected with a second positive power supply end, the second end of the third resistor is a signal output end of the first switch detection circuit, and the emitter of the first optocoupler is grounded;
the second switch detection circuit comprises a fourth resistor, a fifth resistor, a sixth resistor, a third diode, a fourth diode and a second optocoupler;
the anode of the third diode is connected with the first positive power supply end, the cathode of the third diode is connected with the first end of the fourth resistor, the second end of the fourth resistor is connected with the anode of the second optocoupler, the cathode of the second optocoupler is connected with the anode of the fourth diode, the cathode of the fourth diode is the signal input end of the second switch detection circuit, the collector of the second optocoupler, the first end of the fifth resistor and the first end of the sixth resistor are interconnected, the second end of the fifth resistor is connected with the second positive power supply end, the second end of the sixth resistor is the signal output end of the second switch detection circuit, and the emitter of the second optocoupler is grounded.
In one embodiment, the first switch detection circuit includes a seventh resistor, an eighth resistor, a ninth resistor, a tenth resistor, a fifth diode, and a sixth diode;
an anode of the fifth diode is connected to a first positive power supply terminal, a cathode of the fifth diode is connected to a first terminal of the seventh resistor, a second terminal of the seventh resistor, a first terminal of the eighth resistor, a first terminal of the ninth resistor, and a first terminal of the tenth resistor are interconnected, a second terminal of the eighth resistor is connected to an anode of the sixth diode, a cathode of the sixth diode is a signal input terminal of the first switch detection circuit, a second terminal of the ninth resistor is grounded, and a second terminal of the tenth resistor is a signal output terminal of the first switch detection circuit;
the second switch detection circuit comprises an eleventh resistor, a twelfth resistor, a thirteenth resistor, a fourteenth resistor, a seventh diode and an eighth diode;
an anode of the seventh diode is connected to a first positive power supply terminal, a cathode of the seventh diode is connected to a first end of the eleventh resistor, a second end of the eleventh resistor, a first end of the twelfth resistor, a first end of the thirteenth resistor, and a first end of the fourteenth resistor are interconnected, a second end of the twelfth resistor is connected to an anode of the eighth diode, a cathode of the eighth diode is a signal input terminal of the second switch detection circuit, a second end of the thirteenth resistor is grounded, and a second end of the fourteenth resistor is a signal output terminal of the second switch detection circuit.
In one embodiment, the first switch detection circuit comprises a fifteenth resistor, a sixteenth resistor, a seventeenth resistor and a third optocoupler;
a first end of the fifteenth resistor is a signal input end of the first switch detection circuit, a second end of the fifteenth resistor is connected with an anode of the third optocoupler, a cathode of the third optocoupler and an emitter of the third optocoupler are both grounded, a collector of the third optocoupler, a first end of the sixteenth resistor and a first end of the seventeenth resistor are interconnected, a second end of the sixteenth resistor is connected with a first positive power source end, and a second end of the seventeenth resistor is a signal output end of the first switch detection circuit;
the second switch detection circuit comprises an eighteenth resistor, a nineteenth resistor, a twentieth resistor and a fourth optocoupler;
the first end of eighteenth resistance does the signal input part of second switch detection circuitry, the second end of eighteenth resistance with the positive pole of fourth opto-coupler is connected, the negative pole of fourth opto-coupler with the equal ground connection of projecting pole of fourth opto-coupler, the collecting electrode of fourth opto-coupler the first end of nineteenth resistance with the first end of twentieth resistance is interconnected, the second end of nineteenth resistance is connected with first positive power source terminal, the second end of twentieth resistance does the signal output part of second switch detection circuitry.
In one embodiment, the control circuit includes a power module and a controller;
the power supply end of the power supply module is connected with the power supply end of the controller, and the signal end of the controller is the signal end of the control circuit;
the controller is configured to:
respectively outputting a turn-on signal and a turn-off signal to the first switch circuit and respectively outputting a turn-on signal and a turn-off signal to the second switch circuit before controlling the BMS protection boards to discharge, and determining the working states of the first switch circuit and the second switch circuit according to level signals fed back by the first switch detection circuit and the second switch detection circuit;
when the working states of the first switch circuit and the second switch circuit are determined to be normal, the BMS protection boards are controlled to discharge, the first switch circuit is controlled to be normally on, the second switch circuit is controlled to be switched on and off so as to output and control the power supply output by the battery pack, and the first switch circuit is controlled to be switched on and off so as to output and control the power supply output by the battery pack when the second switch circuit is short-circuited;
and when the first switch circuit and/or the second switch circuit are/is determined to be in a short-circuit state or an open-circuit state, controlling each BMS protection board to stop discharging and reporting the fault to a background.
In one embodiment, the battery pack further includes a plurality of insertion detection devices and a plurality of near field communication modules, each of the near field communication modules is electrically connected to each of the insertion detection devices, and each of the near field communication modules is wirelessly connected to the control circuit;
each insertion detection device is arranged on a battery installation position and outputs a feedback signal when the single battery is installed in place;
the near field communication module is used for converting the feedback signal into a near field feedback signal and outputting the near field feedback signal to the control circuit, so that the control circuit determines the installation state of each single battery.
In one embodiment, the battery power supply device further comprises a power supply feedback circuit for feeding back energy, the feedback circuit comprises a ninth diode, an anode of the ninth diode is connected with the output end of the first switch circuit, and a cathode of the ninth diode is connected with the input end of the first switch circuit.
In one embodiment, the battery power supply device further comprises a current sampling circuit, the sampling circuit comprises a sampling resistor, a first end of the sampling resistor is connected with the output end of the first switch circuit, a second end of the sampling resistor is connected with a second end of the battery pack, and two ends of the sampling resistor are further connected with the signal end of the control circuit respectively;
the control circuit is further configured to determine a current flowing through the load according to the voltage across the sampling resistor, and correspondingly control the BMS protection board, the first switch circuit, and the second switch circuit to operate or stop operating according to the magnitude of the current.
In one embodiment, the battery powered device further comprises an over-current protection circuit comprising a fuse connected between the battery pack and the load.
The embodiment of the utility model adopts the battery pack, the first switch circuit, the second switch circuit, the first switch detection circuit, the second switch detection circuit and the control circuit to form the battery power supply device, respectively outputs the turn-on signal or the turn-off signal to the first switch circuit and the second switch circuit before discharging, and determines the working state of the first switch circuit and the second switch circuit according to the first switch detection circuit and the second switch detection circuit, controls the battery pack to discharge and controls the first switch circuit and the second switch circuit to be correspondingly turned on when the first switch circuit and the second switch circuit are both normal, the first switch circuit and the second switch circuit are mutually main and standby switch circuits, the output control of the power supply is carried out by the other switch circuit when one switch circuit is over-voltage or short-circuit, when the abnormal state of the first switch circuit and the second switch circuit is detected before discharging, the battery pack is controlled to stop discharging, faults are reported to the background, the first switch circuit and the second switch circuit are used as external switch circuits to achieve overvoltage and overcurrent protection, and the first switch circuit and the second switch circuit act in advance in the discharging process to perform high-voltage protection on the switch tube of the BMS protection board, so that the overall safety of the battery pack is improved.
Drawings
Fig. 1 is a schematic structural diagram of a first module of a battery power supply apparatus according to an embodiment of the present invention;
fig. 2 is a schematic circuit diagram of a battery power supply device according to an embodiment of the present invention;
fig. 3 is a schematic diagram of a first circuit structure of a first switch detection circuit according to an embodiment of the present invention;
fig. 4 is a schematic diagram of a first circuit structure of a second switch detection circuit according to an embodiment of the present invention;
fig. 5 is a schematic diagram of a second circuit structure of the first switch detection circuit according to an embodiment of the present invention;
fig. 6 is a schematic diagram of a second circuit structure of a second switch detection circuit according to an embodiment of the present invention;
fig. 7 is a schematic diagram of a third circuit structure of the first switch detection circuit according to the embodiment of the present invention;
fig. 8 is a schematic diagram of a third circuit structure of a second switch detection circuit according to an embodiment of the present invention;
fig. 9 is a schematic diagram of a module structure of a battery pack according to an embodiment of the present invention;
fig. 10 is a schematic diagram of a second module structure of a battery power supply device according to an embodiment of the present invention.
Detailed Description
In order to make the technical problem, technical solution and advantageous effects to be solved by the present invention more clearly understood, the following description is given in conjunction with the accompanying drawings and embodiments to illustrate the present invention in further detail. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or be indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or be indirectly connected to the other element.
It will be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in an orientation or positional relationship indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the device or element so referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically limited otherwise.
The embodiment of the utility model provides a first aspect provides a battery power supply unit.
As shown in fig. 1 and fig. 2, fig. 1 is a schematic diagram of a first module structure of a battery power supply device provided by an embodiment of the present invention, and fig. 2 is a schematic diagram of a circuit structure of a battery power supply device provided by an embodiment of the present invention, in this embodiment, the battery power supply device includes a battery pack 10, a first switch circuit 20, a second switch circuit 30, a first switch detection circuit 40, a second switch detection circuit 50, and a control circuit 60;
the first terminal of the battery pack 10 is connected to the input terminal of the load, the output terminal of the load, the input terminal of the second switching circuit 30 and the signal input terminal of the second switching detection circuit 50 are interconnected, the output terminal of the second switching circuit 30, the input terminal of the first switching circuit 20 and the signal input terminal of the first switching detection circuit 40 are interconnected, the output terminal of the first switching circuit 20 and the second terminal of the battery pack 10 are connected and grounded, the controlled terminal of the first switching circuit 20, the controlled terminal of the second switch circuit 30, the signal output terminal of the first switch detection circuit 40, and the signal output terminal of the second switch detection circuit 50 are respectively connected to the signal terminal of the control circuit 60, the battery pack 10 includes a plurality of BMS protection boards and a plurality of battery cells, the plurality of BMS protection boards are sequentially connected in series, each BMS protection board is connected to at least one battery cell, and the controlled terminal of each BMS protection board is further connected to the signal terminal of the control circuit 60;
a control circuit 60 for:
respectively outputting an on signal and an off signal to the first switching circuit 20 and respectively outputting an on signal and an off signal to the second switching circuit 30 before controlling the discharge of each BMS protection panel, and determining the operating states of the first switching circuit 20 and the second switching circuit 30 according to level signals fed back from the first switching detection circuit 40 and the second switching detection circuit 50;
when the working states of the first switch circuit 20 and the second switch circuit 30 are determined to be normal, the BMS protection boards are controlled to discharge, the first switch circuit 20 is controlled to be normally on, the second switch circuit 30 is controlled to be switched on and off to output and control the power supply output by the battery pack 10, and the first switch circuit 20 is controlled to be switched on and off to output and control the power supply output by the battery pack 10 when the second switch circuit 30 is short-circuited;
and when the first switch circuit 20 and/or the second switch circuit 30 are determined to be in a short-circuit state or an open-circuit state, controlling each BMS protection board to stop discharging and reporting the fault to the background.
In this embodiment, the BMS protection boards are used for controlling at least one battery cell to discharge or charge, the number of the battery cells connected to each BMS protection board can be set as required, the plurality of BMS protection boards are sequentially connected in series to form a power supply loop with the load, the second switch circuit 30 and the first switch circuit 20, and each BMS protection board correspondingly outputs a power supply to the load according to the control signal of the control circuit 60.
The first switch circuit 20 and the second switch circuit 30 are external switch devices for being turned on or off correspondingly according to a switch signal of the control circuit 60 to cut off the power supply circuit when the power supply circuit is over-current or over-voltage, thereby preventing the damage of the switch tubes in the load and the BMS protection board, the first switch circuit 20 is used as a standby switch, the first switch circuit 20 is kept in a normally closed state during normal operation, the second switch circuit 30 is used as a power supply switch to control the connection or the disconnection of the power supply circuit, when the second switch circuit 30 is short-circuited, the first switch circuit 20 is started and is correspondingly turned on or off according to the switch signal of the control circuit 60 to control the connection or the disconnection of the power supply circuit.
In order to ensure the normal operation of the load, the control circuit 60 outputs an on signal or an off signal to the first switch circuit 20 and the second switch circuit 30 in advance before discharging, and determines the working state of the first switch circuit 20 and the second switch circuit 30 before starting according to the level signals fed back by the first switch detection circuit 40 and the second switch detection circuit 50, so as to improve the stability and reliability of the subsequent discharge, when it is determined that the operating states of the first and second switching circuits 20 and 30 are both normal, the respective BMS protection boards are controlled to discharge and the first switching circuit 20 is controlled to be normally on and the second switching circuit 30 is controlled to be on and off to perform output control of the power supply outputted from the battery pack 10, when the second switch circuit 30 is short-circuited due to overcurrent or overvoltage during operation, the first switch circuit 20 is controlled to be turned on and off to control the output of the power supply from the battery pack 10.
When the first switch circuit 20 and/or the second switch circuit 30 are determined to be in a short-circuit state or an open-circuit state, that is, when the first switch circuit 20 and the second switch circuit 30 work abnormally, the BMS protection boards are controlled to stop discharging and report a fault to a background so as to inform maintenance personnel of timely maintenance.
Wherein, the first switch circuit 20 and the second switch circuit 30 can adopt a switch tube or a switch component with controlled function, such as a triode, a MOS transistor, etc., as shown in fig. 2, in an embodiment, the first switch circuit 20 includes a first electronic switch tube Q1, the second switch circuit 30 includes a second electronic switch tube Q2, the first switch detection circuit 40 is connected with an input terminal of the first electronic switch tube Q1, the second switch detection circuit 50 is connected with an input terminal of the second electronic switch tube Q2, and outputs a feedback signal to the control circuit 60 according to the level of the input terminals of the first electronic switch tube Q1 and the second electronic switch tube Q2, and further determines whether the operation state of the first electronic switch tube Q1 and the second electronic switch tube Q2 is in a normal on or off state, or in a short circuit or open circuit state, and if the feedback signal output by the switch detection circuit is at a low level, it indicates that the switch circuit is on, the high level indicates that the switch circuit is turned off, which can be analyzed according to the detection steps in tables 1 to 6 below, wherein the first electronic switch Q1 and the second electronic switch Q2 remain turned off in the starting state, H indicates high level, L indicates low level, and x indicates no judgment or no relation. The detection is confirmed according to the turn-on sequence of the two electronic switching tubes, for example the detection of 6 groups of conditions, below, and each group is performed from top to bottom.
TABLE 1
TABLE 2
TABLE 3
TABLE 4
TABLE 5
TABLE 6
According to the detection steps in tables 1 to 6, it can be determined that the first switch circuit 20 is in a normal, short-circuit or open-circuit state and the second switch circuit 30 is in a normal, short-circuit or open-circuit state, respectively, so as to implement the switch detection before discharging and ensure that the BMS protection board and the load work normally.
The first switch detection circuit 40 and the second switch detection circuit 50 may adopt a structure such as a level conversion module and an optical coupling module, and are specifically selected according to requirements, the control circuit 60 may adopt a controller 62, for example, a CPU, an MCU and other controllers 62, the load may be a fan, a motor and other loads, and the specific structure may be designed according to requirements, and is not specifically limited herein.
The embodiment of the present invention uses the battery pack 10, the first switch circuit 20, the second switch circuit 30, the first switch detection circuit 40, the second switch detection circuit 50 and the control circuit 60 to form a battery power supply device, before discharging, the battery power supply device respectively outputs a turn-on signal or a turn-off signal to the first switch circuit 20 and the second switch circuit 30, and determines the working states of the first switch circuit 20 and the second switch circuit 30 according to the first switch detection circuit 40 and the second switch detection circuit 50, when the first switch circuit 20 and the second switch circuit 30 are both normal, the battery pack 10 is controlled to discharge and the first switch circuit 20 and the second switch circuit 30 are controlled to be correspondingly turned on, the first switch circuit 20 and the second switch circuit 30 are main and standby switch circuits, when one of the switch circuits is over-voltage or over-current, the other switch circuit controls the output of the power supply, meanwhile, before discharging, when the abnormal states of the first switch circuit 20 and the second switch circuit 30 are detected, the battery pack 10 is controlled to stop discharging, and a fault is reported to a background, the first switch circuit 20 and the second switch circuit 30 are used as external switch circuits to realize overvoltage and overcurrent protection, and the overvoltage and overcurrent protection acts in advance in the discharging process to perform high-voltage protection on the switch tubes of the BMS protection board, so that the overall safety of the battery pack 10 is improved.
As shown in fig. 3 and 4, in one embodiment, the first switch detection circuit 40 includes a first resistor R1, a second resistor R2, a third resistor R3, a first diode D1, a second diode D2, and a first optical coupler U1;
an anode of the first diode D1 is connected with a first positive power supply end, a cathode of the first diode D1 is connected with a first end of a first resistor R1, a second end of the first resistor R1 is connected with an anode of a first optocoupler U1, a cathode of the first optocoupler U1 is connected with an anode of a second diode D2, a cathode of the second diode D2 is a signal input end of the first switch detection circuit 40, a collector of the first optocoupler U1, a first end of a second resistor R2 and a first end of a third resistor R3 are interconnected, a second end of the second resistor R2 is connected with a second positive power supply end, a second end of the third resistor R3 is a signal output end of the first switch detection circuit 40, and an emitter of the first optocoupler U1 is grounded;
the second switch detection circuit 50 comprises a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a third diode D3, a fourth diode D4 and a second optical coupler;
an anode of the third diode D3 is connected to the first positive power supply terminal, a cathode of the third diode D3 is connected to the first end of the fourth resistor R4, the second end of the fourth resistor R4 is connected to an anode of the second optocoupler, a cathode of the second optocoupler is connected to an anode of the fourth diode D4, a cathode of the fourth diode D4 is a signal input terminal of the second switch detection circuit 50, a collector of the second optocoupler, a first end of the fifth resistor R5 and a first end of the sixth resistor R6 are interconnected, a second end of the fifth resistor R5 is connected to the second positive power supply terminal, a second end of the sixth resistor R6 is a signal output terminal of the second switch detection circuit 50, and an emitter of the second optocoupler is grounded.
In this embodiment, the first switch detection circuit 40 and the second switch detection circuit 50 are turned on by the optical coupler and determine whether the first switch circuit 20 and the second switch circuit 30 are normal according to the level of the collector of the optical coupler, the cathode of the second diode D2 is connected to the input terminal of the first switch circuit 20 as the signal input terminal of the first switch detection circuit 40, the cathode of the fourth diode D4 is connected to the input terminal of the second switch detection circuit 30 as the signal input terminal of the second switch detection circuit 50, meanwhile, the third resistor R3 and the sixth resistor R6 output high and low levels to the control circuit 60, when the control circuit 60 outputs a turn-on signal to the first switch circuit 20, when the first switch circuit 20 is turned on, the anode of the optical coupler is connected to the cathode, and further, the collector is connected to the emitter, the third resistor R3 outputs a low level, which indicates that the first switch circuit 20 is turned on, and when the control circuit 60 outputs a turn-off signal to the first switch circuit 20, when the first switch circuit 20 is turned off, the anode and the cathode of the optical coupler are not communicated, the optical coupler is not painful, the third resistor R3 outputs a high level to indicate that the first switch circuit 20 is not turned on, and similarly, the second switch circuit 30 and the first switch circuit 20 perform control and judgment in the same way, and the control circuit 60 can judge the working states of the first switch circuit 20 and the second switch circuit 30 according to high and low level signals fed back by the third resistor R3 and the sixth resistor R6, wherein the first diode D1, the second diode D2, the third diode D3 and the fourth diode D4 are used for realizing unidirectional conduction, so as to perform power protection on the first optical coupler U1 and the second optical coupler and prevent power from flowing back.
As shown in fig. 5 and 6, in one embodiment, the first switch detection circuit 40 includes a seventh resistor R7, an eighth resistor R8, a ninth resistor R9, a tenth resistor R10, a fifth diode D5, and a sixth diode D6;
an anode of the fifth diode D5 is connected to the first positive power supply terminal, a cathode of the fifth diode D5 is connected to the first terminal of the seventh resistor R7, the second terminal of the seventh resistor R7, the first terminal of the eighth resistor R8, the first terminal of the ninth resistor R9, and the first terminal of the tenth resistor R10 are interconnected, the second terminal of the eighth resistor R8 is connected to an anode of the sixth diode D6, a cathode of the sixth diode D6 is a signal input terminal of the first switch detection circuit 40, a second terminal of the ninth resistor R9 is grounded, and a second terminal of the tenth resistor R10 is a signal output terminal of the first switch detection circuit 40;
the second switch detection circuit 50 includes an eleventh resistor R11, a twelfth resistor R12, a thirteenth resistor R13, a fourteenth resistor R14, a seventh diode D7, and an eighth diode D8;
an anode of the seventh diode D7 is connected to the first positive power source terminal, a cathode of the seventh diode D7 is connected to the first terminal of the eleventh resistor R11, the second terminal of the eleventh resistor R11, the first terminal of the twelfth resistor R12, the first terminal of the thirteenth resistor R13, and the first terminal of the fourteenth resistor R14 are interconnected, the second terminal of the twelfth resistor R12 is connected to an anode of the eighth diode D8, a cathode of the eighth diode D8 is a signal input terminal of the second switch detection circuit 50, a second terminal of the thirteenth resistor R13 is grounded, and a second terminal of the fourteenth resistor R14 is a signal output terminal of the second switch detection circuit 50.
In this embodiment, the first switch circuit 20 and the second switch circuit 30 are determined by using the principle of voltage division, when the first switch circuit 20 is not conducting, the sixth diode D6 is not connected to ground, the voltage value fed back by the tenth resistor R10 is close to the voltage value of the first positive power terminal, which indicates that the first switch circuit 20 is not conducting, when the first switch circuit 20 is conducting, the sixth diode D6 is connected to ground, the voltage value fed back by the tenth resistor R10 is close to half of the voltage value of the first positive power terminal, which indicates that the first switch circuit 20 is conducting, and the principle of the second switch detection circuit 50 is the same as that of the first switch detection circuit 40, and details are not described herein.
As shown in fig. 7 and 8, in one embodiment, the first switch detection circuit 40 includes a fifteenth resistor R15, a sixteenth resistor R16, a seventeenth resistor R17, and a third optocoupler U3;
a first end of a fifteenth resistor R15 is a signal input end of the first switch detection circuit 40, a second end of the fifteenth resistor R15 is connected with an anode of a third optocoupler U3, a cathode of the third optocoupler U3 and an emitter of the third optocoupler U3 are both grounded, a collector of the third optocoupler U3, a first end of a sixteenth resistor R16 and a first end of a seventeenth resistor R17 are interconnected, a second end of the sixteenth resistor R16 is connected with a first positive power supply end, and a second end of a seventeenth resistor R17 is a signal output end of the first switch detection circuit 40;
the second switch detection circuit 50 comprises an eighteenth resistor R18, a nineteenth resistor R19, a twentieth resistor R20 and a fourth optocoupler U4;
the first end of an eighteenth resistor R18 is a signal input end of the second switch detection circuit 50, the second end of the eighteenth resistor R18 is connected with the anode of the fourth optical coupler U4, the cathode of the fourth optical coupler U4 and the emitter of the fourth optical coupler U4 are all grounded, the collector of the fourth optical coupler U4, the first end of a nineteenth resistor R19 and the first end of a twentieth resistor R20 are interconnected, the second end of the nineteenth resistor R19 is in positive connection with the first power supply end, and the second end of the twentieth resistor R20 is a signal output end of the second switch detection circuit 50.
In this embodiment, the working states of the first switch circuit 20 and the second switch circuit 30 are also determined by using the optical coupling conduction principle, when the fifteenth resistor R15 has no output, the third optical coupler U3 is not conducted, the feedback level of the seventeenth resistor R17 is high, which indicates that the first switch circuit 20 is not conducted, when the fifteenth resistor R15 has a signal output, the third optical coupler U3 is conducted, and the feedback level of the seventeenth resistor R17 is low, which indicates that the first switch circuit 20 is conducted, and similarly, the second switch detection circuit 50 has the same principle as the first switch detection circuit 40, and details are not described here.
As shown in fig. 10, in one embodiment, the control circuit 60 includes a power module 61 and a controller 62;
the power end of the power module 61 is connected with the power end of the controller 62, and the signal end of the controller 62 is the signal end of the control circuit 60;
a controller 62 for:
respectively outputting an on signal and an off signal to the first switching circuit 20 and respectively outputting an on signal and an off signal to the second switching circuit 30 before controlling the discharge of each BMS protection panel, and determining the operating states of the first switching circuit 20 and the second switching circuit 30 according to level signals fed back from the first switching detection circuit 40 and the second switching detection circuit 50;
when the working states of the first switch circuit 20 and the second switch circuit 30 are determined to be normal, the BMS protection boards are controlled to discharge, the first switch circuit 20 is controlled to be normally on, the second switch circuit 30 is controlled to be switched on and off to output and control the power supply output by the battery pack 10, and the first switch circuit 20 is controlled to be switched on and off to output and control the power supply output by the battery pack 10 when the second switch circuit 30 is short-circuited;
and when the first switch circuit 20 and/or the second switch circuit 30 are determined to be in a short-circuit state or an open-circuit state, controlling each BMS protection board to stop discharging and reporting the fault to the background.
The controller 62 may be a Central Processing Unit (CPU), other general purpose Processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), a Field-Programmable Gate Array (FPGA) or other Programmable logic device, discrete Gate or transistor logic device, discrete hardware component, or the like. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like.
The power module 61 is used for providing power for the controller 62, the power of the first switch detection circuit 40 and the power of the second switch detection circuit 50 can be provided by the controller 62 or the power module 61, which is not limited specifically herein, and the power module 61 can be a battery or a power adapter, when the power module 61 is a battery, the battery can be charged correspondingly by the battery pack 10, and the specific structure is not limited.
The controller 62 is responsible for discharge control of the battery pack 10 and detection of the first and second switch circuits 20 and 30, that is, outputs an on signal and an off signal to the first switch circuit 20 and the second switch circuit 30, respectively, before controlling the BMS protection boards to discharge, and outputs an on signal and an off signal to the second switch circuit 30, respectively, and determines the operating states of the first and second switch circuits 20 and 30 according to the level signals fed back by the first and second switch detection circuits 40 and 50, and when determining that the operating states of the first and second switch circuits 20 and 30 are both normal, controls the BMS protection boards to discharge and controls the first switch circuit 20 to be normally on and the second switch circuit 30 to output control the on/off power output from the battery pack 10, and controls the first switch circuit 20 to be on and off to output control the power output from the battery pack 10 when the second switch circuit 30 is short-circuited, and when the first switch circuit 20 and/or the second switch circuit 30 are determined to be in a short-circuit state or an open-circuit state, controlling each BMS protection board to stop discharging and reporting the fault to a background to inform maintenance personnel of maintenance.
In this embodiment, as shown in fig. 9, in one embodiment, the battery pack 10 further includes a plurality of insertion detection devices and a plurality of near field communication modules, each near field communication module is electrically connected to each insertion detection device, and each near field communication module is wirelessly connected to the control circuit 60;
each insertion detection device is arranged on the battery installation position and outputs a feedback signal when the single battery is installed in place;
and a near field communication module for converting the feedback signal into a near field feedback signal and outputting the near field feedback signal to the control circuit 60, so that the control circuit 60 determines the installation state of each unit cell.
In this embodiment, the insertion detection device is a seat barrel structure, the bottom of the insertion detection device is provided with a travel switch or a micro switch, the single battery is fixed in the seat barrel structure, the on-off state of the travel switch or the micro switch detects whether the single battery is in place, when the battery is in place, the insertion detection device outputs a feedback signal to the near field communication module, and then informs the control circuit 60 of the installation state of each single battery, after it is determined that each single battery is in place, the control circuit 60 performs the state detection of the first switch circuit 20 and the second switch circuit 30, and the output control of the BMS protection board.
As shown in fig. 2 and 10, in one embodiment, the battery powered device further includes a power feedback circuit 70 for feeding back energy, the feedback circuit includes a ninth diode D9, an anode of the ninth diode D9 is connected to the output terminal of the first switch circuit 20, and a cathode of the ninth diode D9 is connected to the input terminal of the first switch circuit 20.
In this embodiment, when the load is a motor, and the motor is fed back when the motor is braked or stopped, in order to avoid the first switch circuit 20 and the second switch circuit 30 from being impacted by current, when the power is fed back, the current flows into the second end of the load through the ninth diode D9, so as to realize the brake feedback protection.
As shown in fig. 10, in one embodiment, the battery power supply device further includes a current sampling circuit 80, the sampling circuit includes a sampling resistor, a first end of the sampling resistor is connected to the output end of the first switch circuit 20, a second end of the sampling resistor is connected to the second end of the battery pack 10, and two ends of the sampling resistor are further connected to the signal ends of the control circuit 60 respectively;
and the control circuit 60 is further configured to determine a current flowing through the load according to the voltage across the sampling resistor, and control the BMS protection board, the first switch circuit 20, and the second switch circuit 30 to operate or stop operating according to the magnitude of the current.
In this embodiment, the control circuit 60 may determine the current of the power supply loop according to the voltage at the two ends of the sampling resistor and the resistance value of the sampling resistor, so as to implement current regulation and protection, so that the load, the first switch circuit 20, and the second switch circuit 30 can operate reliably.
As shown in fig. 10, in one embodiment, the battery power supply further includes an overcurrent protection circuit 90, where the overcurrent protection circuit 90 includes a fuse, and the fuse is connected between the battery pack 10 and the load, and when the current exceeds a preset value and the control circuit 60 does not have time to turn off the first switch circuit 20 or the second switch circuit 30, the fuse blows automatically and cuts off the power supply loop, so as to implement loop protection.
The above-mentioned embodiments are only used for illustrating the technical solution of the present invention, and not for limiting the same; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not substantially depart from the spirit and scope of the embodiments of the present invention, and are intended to be included within the scope of the present invention.
Claims (10)
1. A battery power supply device is characterized by comprising a battery pack, a first switch circuit, a second switch circuit, a first switch detection circuit, a second switch detection circuit and a control circuit;
the first end of the battery pack is connected with the input end of a load, the output end of the load, the input end of the second switch circuit and the signal input end of the second switch detection circuit are interconnected, the output end of the second switch circuit, the input end of the first switch circuit and the signal input end of the first switch detection circuit are interconnected, the output end of the first switch circuit and the second end of the battery pack are connected and grounded, the controlled end of the first switch circuit, the controlled end of the second switch circuit, the signal output end of the first switch detection circuit and the signal output end of the second switch detection circuit are respectively connected with the signal end of the control circuit, the battery pack comprises a plurality of BMS protection boards and a plurality of single batteries, the plurality of BMS protection boards are sequentially connected in series, and each BMS protection board is connected with at least one single battery, the controlled end of each BMS protection board is also connected with the signal end of the control circuit;
the control circuit is configured to:
respectively outputting a turn-on signal and a turn-off signal to the first switch circuit and respectively outputting a turn-on signal and a turn-off signal to the second switch circuit before controlling the BMS protection boards to discharge, and determining the working states of the first switch circuit and the second switch circuit according to level signals fed back by the first switch detection circuit and the second switch detection circuit;
when the working states of the first switch circuit and the second switch circuit are determined to be normal, the BMS protection boards are controlled to discharge, the first switch circuit is controlled to be normally on, the second switch circuit is controlled to be switched on and off so as to output and control the power supply output by the battery pack, and the first switch circuit is controlled to be switched on and off so as to output and control the power supply output by the battery pack when the second switch circuit is short-circuited;
and when the first switch circuit and/or the second switch circuit are/is determined to be in a short-circuit state or an open-circuit state, controlling each BMS protection board to stop discharging and reporting the fault to a background.
2. The battery operated device of claim 1, wherein the first switching circuit comprises a first electronic switching tube and the second switching circuit comprises a second electronic switching tube.
3. The battery-powered device of claim 1, wherein the first switch detection circuit comprises a first resistor, a second resistor, a third resistor, a first diode, a second diode, and a first optocoupler;
the anode of the first diode is connected with a first positive power supply end, the cathode of the first diode is connected with a first end of a first resistor, the second end of the first resistor is connected with the anode of the first optocoupler, the cathode of the first optocoupler is connected with the anode of a second diode, the cathode of the second diode is a signal input end of the first switch detection circuit, the collector of the first optocoupler, the first end of the second resistor and the first end of the third resistor are interconnected, the second end of the second resistor is connected with a second positive power supply end, the second end of the third resistor is a signal output end of the first switch detection circuit, and the emitter of the first optocoupler is grounded;
the second switch detection circuit comprises a fourth resistor, a fifth resistor, a sixth resistor, a third diode, a fourth diode and a second optocoupler;
the anode of the third diode is connected with the first positive power supply end, the cathode of the third diode is connected with the first end of the fourth resistor, the second end of the fourth resistor is connected with the anode of the second optocoupler, the cathode of the second optocoupler is connected with the anode of the fourth diode, the cathode of the fourth diode is the signal input end of the second switch detection circuit, the collector of the second optocoupler, the first end of the fifth resistor and the first end of the sixth resistor are interconnected, the second end of the fifth resistor is connected with the second positive power supply end, the second end of the sixth resistor is the signal output end of the second switch detection circuit, and the emitter of the second optocoupler is grounded.
4. The battery powered device of claim 1, wherein the first switch detection circuit comprises a seventh resistor, an eighth resistor, a ninth resistor, a tenth resistor, a fifth diode, and a sixth diode;
an anode of the fifth diode is connected to a first positive power supply terminal, a cathode of the fifth diode is connected to a first terminal of the seventh resistor, a second terminal of the seventh resistor, a first terminal of the eighth resistor, a first terminal of the ninth resistor, and a first terminal of the tenth resistor are interconnected, a second terminal of the eighth resistor is connected to an anode of the sixth diode, a cathode of the sixth diode is a signal input terminal of the first switch detection circuit, a second terminal of the ninth resistor is grounded, and a second terminal of the tenth resistor is a signal output terminal of the first switch detection circuit;
the second switch detection circuit comprises an eleventh resistor, a twelfth resistor, a thirteenth resistor, a fourteenth resistor, a seventh diode and an eighth diode;
an anode of the seventh diode is connected to a first positive power supply terminal, a cathode of the seventh diode is connected to a first end of the eleventh resistor, a second end of the eleventh resistor, a first end of the twelfth resistor, a first end of the thirteenth resistor, and a first end of the fourteenth resistor are interconnected, a second end of the twelfth resistor is connected to an anode of the eighth diode, a cathode of the eighth diode is a signal input terminal of the second switch detection circuit, a second end of the thirteenth resistor is grounded, and a second end of the fourteenth resistor is a signal output terminal of the second switch detection circuit.
5. The battery powered device of claim 1, wherein the first switch detection circuit comprises a fifteenth resistor, a sixteenth resistor, a seventeenth resistor, and a third optocoupler;
a first end of the fifteenth resistor is a signal input end of the first switch detection circuit, a second end of the fifteenth resistor is connected with an anode of the third optocoupler, a cathode of the third optocoupler and an emitter of the third optocoupler are both grounded, a collector of the third optocoupler, a first end of the sixteenth resistor and a first end of the seventeenth resistor are interconnected, a second end of the sixteenth resistor is connected with a first positive power source end, and a second end of the seventeenth resistor is a signal output end of the first switch detection circuit;
the second switch detection circuit comprises an eighteenth resistor, a nineteenth resistor, a twentieth resistor and a fourth optocoupler;
the first end of eighteenth resistance does the signal input part of second switch detection circuitry, the second end of eighteenth resistance with the positive pole of fourth opto-coupler is connected, the negative pole of fourth opto-coupler with the equal ground connection of projecting pole of fourth opto-coupler, the collecting electrode of fourth opto-coupler the first end of nineteenth resistance with the first end of twentieth resistance is interconnected, the second end of nineteenth resistance is connected with first positive power source terminal, the second end of twentieth resistance does the signal output part of second switch detection circuitry.
6. The battery powered device of claim 1, wherein the control circuit comprises a power module and a controller;
the power supply end of the power supply module is connected with the power supply end of the controller, and the signal end of the controller is the signal end of the control circuit;
the controller is configured to:
respectively outputting a turn-on signal and a turn-off signal to the first switch circuit and respectively outputting a turn-on signal and a turn-off signal to the second switch circuit before controlling the BMS protection boards to discharge, and determining the working states of the first switch circuit and the second switch circuit according to level signals fed back by the first switch detection circuit and the second switch detection circuit;
when the working states of the first switch circuit and the second switch circuit are determined to be normal, the BMS protection boards are controlled to discharge, the first switch circuit is controlled to be normally on, the second switch circuit is controlled to be switched on and off so as to output and control the power supply output by the battery pack, and the first switch circuit is controlled to be switched on and off so as to output and control the power supply output by the battery pack when the second switch circuit is short-circuited;
and when the first switch circuit and/or the second switch circuit are/is determined to be in a short-circuit state or an open-circuit state, controlling each BMS protection board to stop discharging and reporting the fault to a background.
7. The battery-powered device of claim 1, wherein the battery pack further comprises a plurality of insertion detection devices and a plurality of near field communication modules, each of the near field communication modules being electrically connected to each of the insertion detection devices, each of the near field communication modules being wirelessly connected to the control circuit;
each insertion detection device is arranged on a battery installation position and outputs a feedback signal when the single battery is installed in place;
the near field communication module is used for converting the feedback signal into a near field feedback signal and outputting the near field feedback signal to the control circuit, so that the control circuit determines the installation state of each single battery.
8. The battery-powered device of claim 1 further comprising a power feedback circuit for feeding back energy, the feedback circuit comprising a ninth diode, an anode of the ninth diode being coupled to the output of the first switching circuit, and a cathode of the ninth diode being coupled to the input of the first switching circuit.
9. The battery power supply device according to claim 1, further comprising a current sampling circuit, wherein the sampling circuit comprises a sampling resistor, a first end of the sampling resistor is connected to the output end of the first switch circuit, a second end of the sampling resistor is connected to a second end of the battery pack, and two ends of the sampling resistor are respectively connected to the signal end of the control circuit;
the control circuit is further configured to determine a current flowing through the load according to the voltage across the sampling resistor, and correspondingly control the BMS protection board, the first switch circuit, and the second switch circuit to operate or stop operating according to the magnitude of the current.
10. The battery powered device of claim 1 further comprising an over-current protection circuit comprising a fuse connected between the battery pack and the load.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020572864.1U CN212210526U (en) | 2020-04-17 | 2020-04-17 | Battery power supply device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020572864.1U CN212210526U (en) | 2020-04-17 | 2020-04-17 | Battery power supply device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN212210526U true CN212210526U (en) | 2020-12-22 |
Family
ID=73834093
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202020572864.1U Active CN212210526U (en) | 2020-04-17 | 2020-04-17 | Battery power supply device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN212210526U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2021208457A1 (en) * | 2020-04-17 | 2021-10-21 | 深圳易马达科技有限公司 | Battery power supply device |
-
2020
- 2020-04-17 CN CN202020572864.1U patent/CN212210526U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2021208457A1 (en) * | 2020-04-17 | 2021-10-21 | 深圳易马达科技有限公司 | Battery power supply device |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN111446761A (en) | Battery power supply device | |
| CN102957173A (en) | Multi-cell serially-connected lithium battery pack equalization and protection system | |
| WO2022105263A1 (en) | Photovoltaic system and control method therefor, and air conditioning system | |
| CN212210526U (en) | Battery power supply device | |
| CN202513559U (en) | Battery short-circuit protection circuit | |
| CN214380064U (en) | Battery pack protection circuit, device and electric equipment | |
| CN113258640B (en) | Overcurrent protection circuit of battery and power supply equipment | |
| CN212162855U (en) | High-voltage distribution box for energy storage system | |
| CN216720889U (en) | A photovoltaic system that is used for shutoff device of photovoltaic module and uses it | |
| CN210898576U (en) | Battery charging and discharging protection circuit and battery device | |
| CN111725788B (en) | Overcurrent protection device of energy storage converter | |
| CN205016987U (en) | BMS activates circuit | |
| CN210327131U (en) | Intelligent multi-path energy management controller | |
| CN106849259B (en) | Ups system and its ups system intelligence charge-discharge circuit | |
| CN113690838A (en) | Overcurrent delay protection module and voltage comparison delay circuit | |
| CN110854953A (en) | Battery charging and discharging protection circuit and battery device | |
| CN218771347U (en) | Protection circuit, power supply unit and power supply system | |
| CN109039064A (en) | A kind of shunt regulator device of the anti-single power supply shorted diode of spacecraft | |
| CN217642744U (en) | Distributed photovoltaic power generation grid-connected system | |
| CN215343899U (en) | High-power lithium battery pack protection circuit | |
| CN221042369U (en) | Automatic turn-off protection device for under-voltage battery and electronic equipment | |
| CN114374264B (en) | Uninterrupted replacement method for plug frame of feed unit of direct current system feed screen | |
| CN217984877U (en) | Combined inverter device | |
| CN215300149U (en) | DCDC enabling circuit of multiple protection | |
| CN220172895U (en) | Half-bridge driving protection circuit of solar charging system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |