CN110148799A - A kind of switching device and switching method of lithium ion battery - Google Patents
A kind of switching device and switching method of lithium ion battery Download PDFInfo
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- CN110148799A CN110148799A CN201910286904.8A CN201910286904A CN110148799A CN 110148799 A CN110148799 A CN 110148799A CN 201910286904 A CN201910286904 A CN 201910286904A CN 110148799 A CN110148799 A CN 110148799A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/4207—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells for several batteries or cells simultaneously or sequentially
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/425—Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/425—Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing
- H01M10/4257—Smart batteries, e.g. electronic circuits inside the housing of the cells or batteries
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/48—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/48—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte
- H01M10/482—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte for several batteries or cells simultaneously or sequentially
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/425—Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing
- H01M2010/4271—Battery management systems including electronic circuits, e.g. control of current or voltage to keep battery in healthy state, cell balancing
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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- Manufacturing & Machinery (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
- Secondary Cells (AREA)
Abstract
The invention discloses a kind of switching device of lithium ion battery and switching methods, belong to battery circuit optimisation technique field.Apparatus of the present invention include lithium battery detection circuit, the first field-effect tube, the second field-effect tube, third field-effect tube, the 4th field-effect tube, the 5th field-effect tube, the first transformer, the second transformer, first diode, the second diode, the first square wave generation circuit, the second square wave generation circuit, first capacitor and the second capacitor；Based on the device, The invention also achieves a kind of switching methods of lithium ion battery.When apparatus of the present invention and method detect that lithium battery state is normal, battery accesses battery pack, and when abnormal, battery is switched off battery pack；Switching device of the present invention can be directly controlled by microcontroller or hardware mode, can be acted in time when the single battery core in battery pack breaks down, it is ensured that battery pack it is safe while promote user experience.
Description
Technical field
The invention belongs to battery circuit optimisation technique field, the switching more particularly, to a kind of lithium ion battery is filled
It sets and switching method.
Background technique
The energy storage device in electric bicycle and electric car on the market is the battery pack that multiple batteries are constituted at present,
Control unit is battery management system, and protection mechanism is very simple: when battery management system exists in detecting battery pack
When failure battery core, the connection of battery pack and load is directly cut off.After protection mechanism triggering, electric bicycle or electric car
It can not be again started up, certain influence is brought to user.
And existing lithium battery management system device is more, is only applicable to the protection of entire battery pack, is not suitable for list
The protection of a lithium cells will cause entire battery lithium battery management system excessively if there are many battery pack kind lithium battery quantity
Too fat to move, cost is excessively high, and therefore, urgent need selects a kind of simple and effective protective device, carries out state for single lithium cells
Monitoring and switch protecting.
Summary of the invention
Aiming at the above defects or improvement requirements of the prior art, the present invention provides a kind of switching of lithium ion battery dresses
It sets, its object is to constitute control circuit by field-effect tube and transformer, when detecting that lithium battery state is normal, battery access electricity
Pond group, when abnormal, battery is switched off battery pack, thus solves the technical issues of fail battery switches out battery pack.
To achieve the above object, the present invention provides a kind of switching device of lithium ion battery, described device includes lithium electricity
Pond detection circuit, the first field-effect tube, the second field-effect tube, third field-effect tube, the 4th field-effect tube, the 5th field-effect tube,
First transformer, the second transformer, first diode, the second diode, the first square wave generation circuit, the second square wave generate electricity
Road, first capacitor and the second capacitor；
The lithium battery detection circuit is used to judge the states of lithium cells, and output end connects third field-effect tube and the
The grid of four field-effect tube；
The input terminal of drain electrode the first square wave generation circuit of connection of third field-effect tube, the output of the first square wave generation circuit
Original side, the different name end, side of the first transformer of end connection, the source of the original side side Same Name of Ends connection third field-effect tube of the first transformer
Pole, the source electrode ground connection of third field-effect tube；
The anode of the pair side side Same Name of Ends connection first diode of first transformer, the cathode of first diode, the first electricity
One end of appearance is connected with the grid of the first field-effect tube, pair side, the different name end, side of the first transformer, the other end of first capacitor and
The source electrode of first field-effect tube is connected；
The grid of drain electrode the 5th field-effect tube of connection of 4th field-effect tube, the source electrode connection auxiliary electricity of the 4th field-effect tube
Source；
The input terminal of drain electrode the second square wave generation circuit of connection of 5th field-effect tube, the output of the second square wave generation circuit
Original side, the different name end, side of the second transformer of end connection, the original side side Same Name of Ends of the second transformer connect the source of the 5th field-effect tube
Pole, the source electrode ground connection of the 5th field-effect tube；
The pair side side Same Name of Ends of second transformer connects the anode of the second diode, the consequent pole of the second diode, the second electricity
One end of appearance is connected with the grid of the second field-effect tube, pair side, the different name end, side of the second transformer, the other end of the second capacitor and
The source electrode of second field-effect tube is connected；
First field-effect tube is connected with the drain electrode of the second field-effect tube, the source electrode of the first field-effect tube and the second field-effect tube
Between connect lithium battery to be measured.
Further, the source electrode of anode the first field-effect tube of connection of lithium battery to be measured, cathode connect the second field-effect tube
Source electrode or lithium battery to be measured anode connection the second field-effect tube source electrode, cathode connect the first field-effect tube source electrode.
Further, the lithium battery detection circuit is specially comparator, and an input terminal of comparator inputs lithium battery
Measuring signal, another input terminal of comparator input lithium battery reference signal, and the output end of comparator connects third field-effect
The grid of pipe and the 4th field-effect tube.
Further, the lithium battery reference signal is generated by reference source chip or voltage stabilizing chip.
Further, the lithium battery measuring signal is generated by the voltage difference between lithium battery positive and negative anodes to be measured, or by supervising
The microcontroller for surveying lithium battery state generates.
Further, first field-effect tube, the second field-effect tube, third field-effect tube and the 5th field-effect tube are N
Type field-effect tube；4th field-effect tube is p-type field-effect tube.
Further, first square wave generation circuit and the second square wave generation circuit are constituted using capacitor and resistor
Resonance circuit generate voltage signal, the voltage signal frequency of generation is 100kHz-1MHz.
Further, first transformer and the second transformer share a magnetic core.
It is another aspect of this invention to provide that the present invention provides a kind of switching method of lithium ion battery, the method packet
Include following steps:
When the source electrode of anode the first field-effect tube of connection of lithium battery to be measured, cathode connects the source electrode of the second field-effect tube
When；
(11) lithium battery detection circuit acquisition lithium battery measuring signal and lithium battery reference signal；If lithium battery measuring signal
Amplitude is higher than lithium battery reference signal amplitude, then lithium battery detection circuit exports positive signal, enters step (12), and otherwise output is negative
Signal enters step (13)；
(12) third field-effect tube and the conducting of the first field-effect tube, the 4th field-effect tube, the 5th field-effect tube and second
The shutdown of effect pipe, lithium battery to be measured access battery pack, terminate；
(13) first field-effect tube and the shutdown of third field-effect tube, the 4th field-effect tube, the 5th field-effect tube and second
The conducting of effect pipe, lithium battery to be measured switch out battery pack；
When the source electrode of anode the second field-effect tube of connection of lithium battery to be measured, cathode connects the source electrode of the first field-effect tube
When:
(21) lithium battery detection circuit acquisition lithium battery measuring signal and lithium battery reference signal；If lithium battery measuring signal
Amplitude is higher than lithium battery reference signal amplitude, then lithium battery detection circuit exports negative signal, enters step (22), otherwise exports just
Signal enters step (23)；
(22) third field-effect tube and the shutdown of the first field-effect tube, the 4th field-effect tube, the 5th field-effect tube and second
The conducting of effect pipe, lithium battery to be measured switch out battery pack, terminate；
(23) first field-effect tube and the conducting of third field-effect tube, the 4th field-effect tube, the 5th field-effect tube and second
The shutdown of effect pipe, lithium battery to be measured access battery pack.
In general, through the invention it is contemplated above technical scheme is compared with the prior art, have below beneficial to effect
Fruit:
(1) apparatus of the present invention are monitored lithium battery state by lithium battery detection circuit, detect lithium battery state
When normal, field-effect tube Q3 and field-effect tube Q1 conducting and the concatenated lithium battery of field-effect tube Q1 access battery pack, lithium battery shape
When state is abnormal, field-effect tube Q3 and field-effect tube Q1 shutdown and the concatenated lithium battery of field-effect tube Q1 are switched off battery pack,
Switching device of the present invention can detect lithium battery state by microcontroller or hardware mode, and the single battery core in battery pack occurs
Can be acted in time when failure, it is ensured that battery pack it is safe while promote user experience；
(2) in routine techniques, isolation field-effect manages circuit processed and uses photoelectric coupled device or digital level isolator
Part by field-effect tube circuit side with control side be isolated, device drive ability is weaker, can not directly drive field-effect tube, need by
Auxiliary circuit is isolated and generates the enough driving signals of voltage magnitude, and each field-effect tube is both needed to an isolated drive circuit, it is more
It is sufficiently bulky shared by isolated drive circuit when a battery group, the volume of battery pack is increased, and use in the present invention using change
Depressor is isolated by field-effect tube circuit side with control side, solves problem above.
Detailed description of the invention
Fig. 1 is the circuit diagram of apparatus of the present invention embodiment；
Fig. 2 is the comparator circuit schematic diagram in apparatus of the present invention embodiment；
Fig. 3 is square wave generation circuit schematic diagram in apparatus of the present invention embodiment；
Fig. 4 is the corresponding relationship of capacitor C1 both end voltage and time in apparatus of the present invention embodiment；
Fig. 5 is the corresponding relationship of capacitor C2 both end voltage and time in apparatus of the present invention embodiment.
Specific embodiment
In order to make the objectives, technical solutions, and advantages of the present invention clearer, with reference to the accompanying drawings and embodiments, right
The present invention is further elaborated.It should be appreciated that described herein, specific examples are only used to explain the present invention, not
For limiting the present invention.As long as in addition, technical characteristic involved in the various embodiments of the present invention described below that
Not constituting conflict between this can be combined with each other.
It should be noted that term " Q1 ", " Q2 " in description and claims of this specification and above-mentioned attached drawing,
" D1 ", " D2 " etc. are to be used to distinguish similar objects, without for describing specific device or sequencing, it should be appreciated that this
The data that sample uses are interchangeable under appropriate circumstances.
Embodiment:
A kind of lithium ion battery switching device, including the isolation control circuit of field-effect tube Q1, Q2,
The field-effect tube control circuit includes comparator circuit, control unit one, control unit two, square wave generation electricity
Road.
Controlled field-effect tube is the N-type field-effect tube IRF540 of company, Infineon production, and controlled battery is ferric phosphate
Lithium dynamical battery.
As shown in Figure 1, described control unit one includes:
Diode D1, the grid of the cathode and field-effect tube Q1 of the diode D1 are connected directly, the positive and transformation
The pair side device T1 side Same Name of Ends is connected directly.
Grid, source electrode and the pair side the transformer T1 side different name of capacitor C1, the capacitor C1 and field-effect tube Q1
End is connected directly.
Transformer T1, the original side transformer T1 side Same Name of Ends and the source electrode of the field-effect tube Q3 are directly connected to, described
Transformer primary side, different name end, side is directly connected to square wave generation circuit output port.
N-type field-effect tube Q3, the drain electrode of the N-type field-effect tube Q3 and the input terminal of square wave generation circuit are connected directly,
Described control unit two includes:
Diode D2, the cathode of the diode D2 and the grid of field-effect tube Q2 be connected directly, anode and the transformation
The pair side device T2 side Same Name of Ends is connected directly.
Capacitor C2, grid, source electrode and the pair side the transformer T2, the different name end, side of the capacitor and field-effect tube Q2
It is connected directly.
The source electrode of transformer T2, the original side transformer T2 side Same Name of Ends and the N-type field-effect tube Q5 are directly connected to, are former
Square side different name end is directly connected to square wave generation circuit output end.
P-type field-effect tube Q4, the source electrode of the p-type field-effect tube Q4 are connected directly with accessory power supply port, grid with than
It is directly connected to compared with circuit output port.
N-type field-effect tube Q5, the drain electrode of the N-type field-effect tube Q5 are directly connected to square wave generation circuit input terminal, grid
Pole and the drain electrode of the p-type field-effect tube Q4 are directly connected to.
Fig. 2 is the schematic diagram of comparator circuit, and in the present embodiment, the comparator U1 is that Texas Instruments produces
LM311.As shown in Fig. 2, the auxiliary power output end mouth provides operating voltage, the auxiliary power output end for comparator
Mouth is directly connected to by two capacitor C3, C4 ground connection, the comparator negative input mouth with the reference circuit output port,
The comparator electrode input end mouth is directly connected to the microcontroller IO.
Fig. 3 is the schematic diagram of square wave generation circuit, and in the present embodiment, the chip U2 is that Linear Techn Inc., the U.S. produces
LT1693-2IS8.
The pin 6 and pin 8 of the auxiliary power output end mouth and U2 are connected directly, the pin 2 and pin 4 of the chip
It is directly grounded, the auxiliary power output end mouth passes through two capacitor C7, C8 ground connection, the input port of the square wave generation circuit
It is connected directly with the pin 5 of the chip, is connected by a resistance R3 with the pin 1 of the chip, the square wave generates electricity
The output port on road is connected by a capacitor C6 with the pin 3 of the chip and pin 7, and the pin 1 of the chip passes through electricity
Hold C5 and resistance R2 to be grounded.
When comparator circuit output port output is timing, the N-type field-effect tube Q3 is open-minded, the p-type field effect
Should pipe Q4 shutdown, N-type field-effect tube Q5 shutdown, the output signal of the square wave generation circuit by the transformer T1 and
The field-effect tube Q1 is connected in the diode D1, and the field-effect tube Q2 shutdown, the lithium ion battery accesses battery
Group.
When comparator circuit output port output is negative, the p-type field-effect tube Q4 is open-minded, the N-type field effect
Should pipe Q5 it is open-minded, N-type field-effect tube Q3 shutdown, the output signal of the square wave generation circuit by the transformer T2 and
The field-effect tube Q2 is connected in the diode D2, and the field-effect tube Q1 shutdown, the lithium ion battery switches out electricity
Pond group.
Fig. 4 is the voltage and the corresponding relationship of time at the both ends the capacitor C1.When the comparator circuit output end
Mouth output is timing, and the capacitor voltage at both ends is fluctuated in very a small range, grid and the source electrode electricity of the field-effect tube Q1
Pressure difference maintains a definite value, and the field-effect tube Q1 is open-minded, described when comparator circuit output port output is negative
Capacitor voltage at both ends is zero, the field-effect tube Q1 shutdown；
Fig. 5 is the voltage and the corresponding relationship of time at the both ends the capacitor C2.When the comparator circuit output end
Mouth output is timing, and the capacitor voltage at both ends is zero, the field-effect tube Q2 shutdown, when the comparator circuit output end
When mouth output is negative, the capacitor voltage at both ends is fluctuated in very a small range, grid and the source electrode electricity of the field-effect tube Q2
Pressure difference maintains a definite value, and the field-effect tube Q2 is open-minded.
The above content as it will be easily appreciated by one skilled in the art that the foregoing is merely illustrative of the preferred embodiments of the present invention,
It is not intended to limit the invention, any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention,
It should all be included in the protection scope of the present invention.
Claims (9)
1. a kind of switching device of lithium ion battery, which is characterized in that described device includes lithium battery detection circuit, first effect
Should manage (Q1), the second field-effect tube (Q2), third field-effect tube (Q3), the 4th field-effect tube (Q4), the 5th field-effect tube (Q5),
First transformer (T1), the second transformer (T2), first diode (D1), the second diode (D2), the first square wave generation circuit,
Second square wave generation circuit, first capacitor (C1) and the second capacitor (C2)；
The lithium battery detection circuit is used to judge the states of lithium cells, and output end connects third field-effect tube (Q3) and the
The grid of four field-effect tube (Q4)；
The input terminal of drain electrode the first square wave generation circuit of connection of third field-effect tube (Q3), the output of the first square wave generation circuit
The original side side Same Name of Ends at original side, the different name end, side of end connection the first transformer (T1), the first transformer (T1) connects third field-effect
Manage the source electrode of (Q3), the source electrode ground connection of third field-effect tube (Q3)；
The anode of pair side side Same Name of Ends connection first diode (D1) of first transformer (T1), first diode (D1) are born
Pole, first capacitor (C1) one end be connected with the grid of the first field-effect tube (Q1), the pair side side different name of the first transformer (T1)
The source electrode at end, the other end of first capacitor (C1) and the first field-effect tube (Q1) is connected；
The drain electrode of 4th field-effect tube (Q4) connects the grid of the 5th field-effect tube (Q5), and the source electrode of the 4th field-effect tube (Q4) connects
Connect accessory power supply；
The input terminal of drain electrode the second square wave generation circuit of connection of 5th field-effect tube (Q5), the output of the second square wave generation circuit
The original side side Same Name of Ends at original side, the different name end, side of end connection the second transformer (T2), the second transformer (T2) connects the 5th field-effect
Manage the source electrode of (Q5), the source electrode ground connection of the 5th field-effect tube (Q5)；
The anode of the pair side side Same Name of Ends connection the second diode (D2) of second transformer (T2), the pair of the second diode (D2)
Pole, the second capacitor (C2) one end be connected with the grid of the second field-effect tube (Q2), the pair side side different name of the second transformer (T2)
The source electrode at end, the other end of the second capacitor (C2) and the second field-effect tube (Q2) is connected；
First field-effect tube (Q1) is connected with the drain electrode of the second field-effect tube (Q2), the first field-effect tube (Q1) and the second field-effect
It manages and connects lithium battery to be measured between the source electrode of (Q2).
2. a kind of switching device of lithium ion battery according to claim 1, which is characterized in that the anode of lithium battery to be measured
The source electrode of the first field-effect tube (Q1) is connected, the source electrode or lithium battery to be measured that cathode connects the second field-effect tube (Q2) are just
Pole connects the source electrode of the second field-effect tube (Q2), and cathode connects the source electrode of the first field-effect tube (Q1).
3. a kind of switching device of lithium ion battery according to claim 1 or 2, which is characterized in that the lithium battery inspection
Slowdown monitoring circuit is specially comparator, and an input terminal of comparator inputs lithium battery measuring signal, another input terminal of comparator
Input lithium battery reference signal, the grid of output end connection third field-effect tube (Q3) and the 4th field-effect tube (Q4) of comparator
Pole.
4. a kind of switching device of lithium ion battery according to claim 3, which is characterized in that the lithium battery is with reference to letter
It number is generated by reference source chip or voltage stabilizing chip.
5. a kind of switching device of lithium ion battery according to claim 3, which is characterized in that the lithium battery measurement letter
Number by between lithium battery positive and negative anodes to be measured voltage difference generate, or by monitoring lithium battery state microcontroller generate.
6. a kind of switching device of lithium ion battery according to claim 1, which is characterized in that first field-effect tube
(Q1), the second field-effect tube (Q2), third field-effect tube (Q3) and the 5th field-effect tube (Q5) are N-type field-effect tube；Described
Four field-effect tube (Q4) are p-type field-effect tube.
7. a kind of switching device of lithium ion battery according to claim 1, which is characterized in that first square wave generates
The resonance circuit generation voltage signal that circuit and the second square wave generation circuit are constituted using capacitor and resistor, the voltage of generation
Signal frequency is 100kHz-1MHz.
8. a kind of switching device of lithium ion battery according to claim 1, which is characterized in that first transformer
(T1) and the second transformer (T2) shares a magnetic core.
9. a kind of switching method based on the lithium ion battery of any claim described device in claim 1-7, feature
It is, the described method comprises the following steps:
When the source electrode of the anode connection the first field-effect tube (Q1) of lithium battery to be measured, cathode connects the source of the second field-effect tube (Q2)
When pole；
(11) lithium battery detection circuit acquisition lithium battery measuring signal and lithium battery reference signal；If lithium battery measuring signal amplitude
Higher than lithium battery reference signal amplitude, then lithium battery detection circuit exports positive signal, enters step (12), otherwise the negative letter of output
Number, enter step (13)；
(12) third field-effect tube (Q3) and the first field-effect tube (Q1) conducting, the 4th field-effect tube (Q4), the 5th field-effect tube
(Q5) and the second field-effect tube (Q2) shutdown, lithium battery to be measured access battery pack, terminate；
(13) first field-effect tube (Q1) and third field-effect tube (Q3) shutdown, the 4th field-effect tube (Q4), the 5th field-effect tube
(Q5) and the second field-effect tube (Q2) conducting, lithium battery to be measured switch out battery pack；
When the source electrode of the anode connection the second field-effect tube (Q2) of lithium battery to be measured, cathode connects the source of the first field-effect tube (Q1)
When pole:
(21) lithium battery detection circuit acquisition lithium battery measuring signal and lithium battery reference signal；If lithium battery measuring signal amplitude
Higher than lithium battery reference signal amplitude, then lithium battery detection circuit exports negative signal, enters step (22), otherwise the positive letter of output
Number, enter step (23)；
(22) third field-effect tube (Q3) and the first field-effect tube (Q1) shutdown, the 4th field-effect tube (Q4), the 5th field-effect tube
(Q5) and the second field-effect tube (Q2) conducting, lithium battery to be measured switch out battery pack, terminate；
(23) first field-effect tube (Q1) and third field-effect tube (Q3) conducting, the 4th field-effect tube (Q4), the 5th field-effect tube
(Q5) and the second field-effect tube (Q2) shutdown, lithium battery to be measured access battery pack.
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| CN201910286904.8A CN110148799B (en) | 2019-04-11 | 2019-04-11 | Switching device and switching method of lithium ion battery |
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| CN201910286904.8A CN110148799B (en) | 2019-04-11 | 2019-04-11 | Switching device and switching method of lithium ion battery |
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| CN110148799B CN110148799B (en) | 2020-10-30 |
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