CN110148799B - Switching device and switching method of lithium ion battery - Google Patents
Switching device and switching method of lithium ion battery Download PDFInfo
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- CN110148799B CN110148799B CN201910286904.8A CN201910286904A CN110148799B CN 110148799 B CN110148799 B CN 110148799B CN 201910286904 A CN201910286904 A CN 201910286904A CN 110148799 B CN110148799 B CN 110148799B
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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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- Charge And Discharge Circuits For Batteries Or The Like (AREA)
- Secondary Cells (AREA)
Abstract
The invention discloses a switching device and a switching method of a lithium ion battery, and belongs to the technical field of battery pack circuit optimization. The device comprises a lithium battery detection circuit, a first field effect tube, a second field effect tube, a third field effect tube, a fourth field effect tube, a fifth field effect tube, a first transformer, a second transformer, a first diode, a second diode, a first square wave generation circuit, a second square wave generation circuit, a first capacitor and a second capacitor; based on the device, the invention also discloses a switching method of the lithium ion battery. When the device and the method detect that the state of the lithium battery is normal, the battery is connected into the battery pack, and when the state of the lithium battery is abnormal, the battery is switched out of the battery pack; the switching device can be directly controlled by a microcontroller or a hardware mode, and can act in time when a single battery cell in the battery pack breaks down, so that the safety of the battery pack is ensured, and the user experience is improved.
Description
Technical Field
The invention belongs to the technical field of battery pack circuit optimization, and particularly relates to a switching device and a switching method of a lithium ion battery.
Background
Energy storage devices in electric bicycles and electric automobiles on the market at present are battery packs formed by a plurality of batteries, a control part of the battery pack is a battery management system, and a protection mechanism of the battery pack is very simple: when the battery management system detects that a fault battery cell exists in the battery pack, the connection between the battery pack and a load is directly cut off. After the protection mechanism is triggered, the electric bicycle or the electric automobile cannot be restarted, and certain influence is brought to a user.
Moreover, the existing lithium battery management system has many devices, is only suitable for protection of the whole battery pack, and is not suitable for protection of a single lithium battery unit, and if the number of the lithium batteries in the battery pack is large, the whole battery lithium battery management system is too bulky and has high cost, so that a simple and effective protection device is urgently needed to be selected to perform state monitoring and switching protection on the single lithium battery unit.
Disclosure of Invention
In view of the above drawbacks and needs of the prior art, the present invention provides a switching device for a lithium ion battery, which comprises a control circuit including a field effect transistor and a transformer, wherein when a normal state of the lithium battery is detected, the battery is connected to a battery pack, and when the battery is not normal, the battery is switched out of the battery pack, thereby solving the technical problem of switching a faulty battery out of the battery pack.
In order to achieve the above object, the present invention provides a switching device of a lithium ion battery, the device includes a lithium battery detection circuit, a first field effect transistor, a second field effect transistor, a third field effect transistor, a fourth field effect transistor, a fifth field effect transistor, a first transformer, a second transformer, a first diode, a second diode, a first square wave generation circuit, a second square wave generation circuit, a first capacitor and a second capacitor;
the lithium battery detection circuit is used for judging the state of the lithium battery unit, and the output end of the lithium battery detection circuit is connected with the grid electrodes of the third field effect transistor and the fourth field effect transistor;
the drain electrode of the third field effect tube is connected with the input end of the first square wave generating circuit, the output end of the first square wave generating circuit is connected with the original side different name end of the first transformer, the original side same name end of the first transformer is connected with the source electrode of the third field effect tube, and the source electrode of the third field effect tube is grounded;
the common-name end of the secondary side of the first transformer is connected with the anode of a first diode, the cathode of the first diode and one end of a first capacitor are connected with the grid electrode of a first field effect tube, and the different-name end of the secondary side of the first transformer and the other end of the first capacitor are connected with the source electrode of the first field effect tube;
the drain electrode of the fourth field effect transistor is connected with the grid electrode of the fifth field effect transistor, and the source electrode of the fourth field effect transistor is connected with the auxiliary power supply;
the drain electrode of the fifth field effect tube is connected with the input end of the second square wave generating circuit, the output end of the second square wave generating circuit is connected with the original side synonym end of the second transformer, the original side homonymy end of the second transformer is connected with the source electrode of the fifth field effect tube, and the source electrode of the fifth field effect tube is grounded;
the secondary side homonymous end of the second transformer is connected with the anode of a second diode, the secondary pole of the second diode and one end of a second capacitor are connected with the grid electrode of a second field effect transistor, and the secondary side heteronymous end of the second transformer and the other end of the second capacitor are connected with the source electrode of the second field effect transistor;
the drain electrodes of the first field effect tube and the second field effect tube are connected, and the lithium battery to be tested is connected between the source electrodes of the first field effect tube and the second field effect tube.
Further, the anode of the lithium battery to be tested is connected with the source electrode of the first field effect transistor, the cathode of the lithium battery to be tested is connected with the source electrode of the second field effect transistor, or the anode of the lithium battery to be tested is connected with the source electrode of the second field effect transistor, and the cathode of the lithium battery to be tested is connected with the source electrode of the first field effect transistor.
Furthermore, the lithium battery detection circuit is specifically a comparator, a lithium battery measurement signal is input to one input end of the comparator, a lithium battery reference signal is input to the other input end of the comparator, and the output end of the comparator is connected with the grid electrodes of the third field-effect tube and the fourth field-effect tube.
Further, the lithium battery reference signal is generated by a reference source chip or a voltage stabilizing chip.
Furthermore, the lithium battery measuring signal is generated by the voltage difference between the anode and the cathode of the lithium battery to be measured, or generated by a microcontroller for monitoring the state of the lithium battery.
Further, the first field effect transistor, the second field effect transistor, the third field effect transistor and the fifth field effect transistor are N-type field effect transistors; the fourth field effect transistor is a P-type field effect transistor.
Further, the first square wave generating circuit and the second square wave generating circuit generate voltage signals by adopting a resonant circuit formed by a capacitor and a resistor, and the frequency of the generated voltage signals is 100kHz-1 MHz.
Further, the first transformer and the second transformer share a magnetic core.
According to another aspect of the present invention, there is provided a switching method of a lithium ion battery, the method comprising the steps of:
when the anode of the lithium battery to be tested is connected with the source electrode of the first field effect transistor, and the cathode of the lithium battery to be tested is connected with the source electrode of the second field effect transistor;
(11) the lithium battery detection circuit collects a lithium battery measurement signal and a lithium battery reference signal; if the amplitude of the lithium battery measurement signal is higher than the amplitude of the lithium battery reference signal, the lithium battery detection circuit outputs a positive signal and enters the step (12), otherwise, a negative signal is output and enters the step (13);
(12) the third field effect tube is conducted with the first field effect tube, the fourth field effect tube, the fifth field effect tube and the second field effect tube are turned off, the lithium battery to be tested is connected into the battery pack, and the operation is finished;
(13) the first field effect tube and the third field effect tube are turned off, the fourth field effect tube, the fifth field effect tube and the second field effect tube are turned on, and the lithium battery to be tested is switched out of the battery pack;
when the positive pole of the lithium battery to be tested is connected with the source electrode of the second field effect transistor, and the negative pole is connected with the source electrode of the first field effect transistor:
(21) the lithium battery detection circuit collects a lithium battery measurement signal and a lithium battery reference signal; if the amplitude of the lithium battery measurement signal is higher than the amplitude of the lithium battery reference signal, the lithium battery detection circuit outputs a negative signal and enters the step (22), otherwise, a positive signal is output and enters the step (23);
(22) the third field effect tube and the first field effect tube are turned off, the fourth field effect tube, the fifth field effect tube and the second field effect tube are turned on, the lithium battery to be tested is switched out of the battery pack, and the operation is finished;
(23) the first field effect tube and the third field effect tube are connected, the fourth field effect tube, the fifth field effect tube and the second field effect tube are disconnected, and the lithium battery to be tested is connected into the battery pack.
Generally, compared with the prior art, the above technical solution conceived by the present invention has the following beneficial effects:
(1) the device monitors the state of the lithium battery through the lithium battery detection circuit, when the state of the lithium battery is detected to be normal, the field effect tube Q3 and the field effect tube Q1 are conducted, the lithium battery connected with the field effect tube Q1 in series is connected into the battery pack, when the state of the lithium battery is abnormal, the field effect tube Q3 and the field effect tube Q1 are switched off, and the lithium battery connected with the field effect tube Q1 in series is switched out of the battery pack;
(2) in the conventional technology, the isolation field effect tube control circuit isolates the circuit side of the field effect tube from the control side by using a photoelectric coupling device or a digital level isolation device, the device has weak driving capability, the field effect tube cannot be directly driven, a driving signal with enough voltage amplitude is required to be generated by an isolation auxiliary circuit, each field effect tube needs an isolation driving circuit, the volume occupied by the isolation driving circuits is large when a plurality of batteries are grouped, and the volume of a battery pack is increased.
Drawings
FIG. 1 is a schematic circuit diagram of an embodiment of the apparatus of the present invention;
FIG. 2is a schematic diagram of a comparator circuit in an embodiment of the apparatus of the present invention;
FIG. 3 is a schematic diagram of a square wave generation circuit in an embodiment of the apparatus of the present invention;
FIG. 4 is a graph of voltage across the capacitor C1 versus time in an embodiment of the apparatus of the present invention;
fig. 5 shows the voltage across the capacitor C2 versus time in an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. In addition, the technical features involved in the embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
It should be noted that the terms "Q1", "Q2", "D1", "D2" and the like in the description and claims of the present invention and the above-described drawings are used for distinguishing similar objects and not necessarily for describing a particular device or order of precedence, and it should be understood that such used data may be interchanged where appropriate.
Example (b):
a lithium ion battery switching device comprises isolation control circuits of field effect transistors Q1 and Q2,
the field effect tube control circuit comprises a comparator circuit, a first control unit, a second control unit and a square wave generation circuit.
The field effect transistor is an N-type field effect transistor IRF540 produced by England flying company, and the battery is a lithium iron phosphate power battery.
As shown in fig. 1, the first control unit includes:
and the cathode of the diode D1 is directly connected with the grid of the field effect transistor Q1, and the anode of the diode D1 is directly connected with the dotted end on the secondary side of the transformer T1.
And the capacitor C1, the capacitor C1 and the grid and the source of the field effect transistor Q1 are directly connected with the synonym end at the secondary side of the transformer T1.
And the homonymous end of the primary side of the transformer T1 is directly connected with the source electrode of the field effect transistor Q3, and the synonym end of the primary side of the transformer is directly connected with the output port of the square wave generation circuit.
An N-type field effect transistor Q3, wherein the drain electrode of the N-type field effect transistor Q3 is directly connected with the input end of the square wave generating circuit,
the second control unit comprises:
and the cathode of the diode D2 is directly connected with the grid of the field effect transistor Q2, and the anode of the diode D2 is directly connected with the dotted end on the secondary side of the transformer T2.
And the capacitor C2 is directly connected with the grid and the source of the field effect transistor Q2 and the synonym terminal on the secondary side of the transformer T2.
And the homonymous end of the primary side of the transformer T2 is directly connected with the source electrode of the N-type field effect transistor Q5, and the synonym end of the primary side of the transformer T2 is directly connected with the output end of the square wave generating circuit.
And the source electrode of the P-type field effect transistor Q4 is directly connected with the auxiliary power supply port, and the grid electrode of the P-type field effect transistor Q4 is directly connected with the output port of the comparison circuit.
And the drain electrode of the N-type field effect transistor Q5 is directly connected with the input end of the square wave generating circuit, and the grid electrode of the N-type field effect transistor Q5 is directly connected with the drain electrode of the P-type field effect transistor Q4.
Fig. 2is a schematic diagram of a comparator circuit, in this embodiment, the comparator U1 is LM311 manufactured by texas instruments, usa. As shown in fig. 2, the auxiliary power output port provides an operating voltage for the comparator, the auxiliary power output port is grounded through two capacitors C3 and C4, the negative input port of the comparator is directly connected to the output port of the reference circuit, and the positive input port of the comparator is directly connected to the IO of the microcontroller.
FIG. 3 IS a schematic diagram of a square wave generating circuit, in this embodiment, the chip U2 IS LT1693-2IS8 manufactured by Lingeltt, USA.
The auxiliary power supply output port is directly connected with a pin 6 and a pin 8 of U2, a pin 2 and a pin 4 of the chip are directly grounded, the auxiliary power supply output port is grounded through two capacitors C7 and C8, an input port of the square wave generating circuit is directly connected with a pin 5 of the chip and is connected with a pin 1 of the chip through a resistor R3, an output port of the square wave generating circuit is connected with the pin 3 and the pin 7 of the chip through a capacitor C6, and the pin 1 of the chip is grounded through a capacitor C5 and a resistor R2.
When the output of the output port of the comparator circuit is positive, the N-type field effect transistor Q3 is turned on, the P-type field effect transistor Q4 is turned off, the N-type field effect transistor Q5 is turned off, the output signal of the square wave generation circuit enables the field effect transistor Q1 to be turned on through the transformer T1 and the diode D1, the field effect transistor Q2 is turned off, and the lithium ion battery is connected to the battery pack.
When the output of the output port of the comparator circuit is negative, the P-type field effect transistor Q4 is turned on, the N-type field effect transistor Q5 is turned on, the N-type field effect transistor Q3 is turned off, the output signal of the square wave generation circuit enables the field effect transistor Q2 to be turned on through the transformer T2 and the diode D2, the field effect transistor Q1 is turned off, and the lithium ion battery is switched out of the battery pack.
Fig. 4 is a graph of the voltage across the capacitor C1 versus time. When the output of the output port of the comparator circuit is positive, the voltage at the two ends of the capacitor fluctuates in a small range, the voltage difference between the grid electrode and the source electrode of the field effect transistor Q1 is maintained at a constant value, the field effect transistor Q1 is turned on, when the output of the output port of the comparator circuit is negative, the voltage at the two ends of the capacitor is zero, and the field effect transistor Q1 is turned off;
fig. 5 is a graph of the voltage across the capacitor C2 versus time. When the output of the output port of the comparator circuit is positive, the voltage at the two ends of the capacitor is zero, the field effect transistor Q2 is turned off, when the output of the output port of the comparator circuit is negative, the voltage at the two ends of the capacitor fluctuates in a small range, the voltage difference between the grid and the source of the field effect transistor Q2 is maintained at a fixed value, and the field effect transistor Q2 is turned on.
It will be appreciated by those skilled in the art that the foregoing is only a preferred embodiment of the invention, and is not intended to limit the invention, such that various modifications, equivalents and improvements may be made without departing from the spirit and scope of the invention.
Claims (8)
1. The switching device of the lithium ion battery is characterized by comprising a lithium battery detection circuit, a first field effect transistor (Q1), a second field effect transistor (Q2), a third field effect transistor (Q3), a fourth field effect transistor (Q4), a fifth field effect transistor (Q5), a first transformer (T1), a second transformer (T2), a first diode (D1), a second diode (D2), a first square wave generation circuit, a second square wave generation circuit, a first capacitor (C1) and a second capacitor (C2);
the lithium battery detection circuit is specifically a comparator, one input end of the comparator inputs a lithium battery measurement signal, the other input end of the comparator inputs a lithium battery reference signal, and the output end of the comparator is connected with the grid electrodes of a third field-effect tube (Q3) and a fourth field-effect tube (Q4);
the lithium battery detection circuit is used for judging the state of the lithium battery unit, and the output end of the lithium battery detection circuit is connected with the grids of the third field-effect tube (Q3) and the fourth field-effect tube (Q4);
the drain electrode of the third field effect transistor (Q3) is connected with the input end of the first square wave generating circuit, the output end of the first square wave generating circuit is connected with the primary-side different-name end of the first transformer (T1), the primary-side same-name end of the first transformer (T1) is connected with the source electrode of the third field effect transistor (Q3), and the source electrode of the third field effect transistor (Q3) is grounded;
the common-name end of the secondary side of the first transformer (T1) is connected with the anode of a first diode (D1), the cathode of the first diode (D1) and one end of a first capacitor (C1) are connected with the grid of a first field-effect tube (Q1), and the different-name end of the secondary side of the first transformer (T1) and the other end of the first capacitor (C1) are connected with the source of the first field-effect tube (Q1);
the drain electrode of the fourth field effect transistor (Q4) is connected with the grid electrode of the fifth field effect transistor (Q5), and the source electrode of the fourth field effect transistor (Q4) is connected with the auxiliary power supply;
the drain electrode of the fifth field effect transistor (Q5) is connected with the input end of the second square wave generating circuit, the output end of the second square wave generating circuit is connected with the different name end of the original side of the second transformer (T2), the same name end of the original side of the second transformer (T2) is connected with the source electrode of the fifth field effect transistor (Q5), and the source electrode of the fifth field effect transistor (Q5) is grounded;
the synonym end of the secondary side of the second transformer (T2) is connected with the anode of a second diode (D2), the cathode of the second diode (D2) and one end of a second capacitor (C2) are connected with the grid of a second field-effect tube (Q2), and the synonym end of the secondary side of the second transformer (T2) and the other end of the second capacitor (C2) are connected with the source of the second field-effect tube (Q2);
the drain electrodes of the first field-effect tube (Q1) and the second field-effect tube (Q2) are connected, and the lithium battery to be tested is connected between the source electrodes of the first field-effect tube (Q1) and the second field-effect tube (Q2).
2. The switching device of the lithium ion battery according to claim 1, wherein the positive electrode of the lithium battery to be tested is connected to the source electrode of the first field effect transistor (Q1), the negative electrode of the lithium battery to be tested is connected to the source electrode of the second field effect transistor (Q2), or the positive electrode of the lithium battery to be tested is connected to the source electrode of the second field effect transistor (Q2), and the negative electrode of the lithium battery to be tested is connected to the source electrode of the first field effect transistor (Q1).
3. The switching device of claim 1, wherein the lithium battery reference signal is generated by a reference source chip or a voltage stabilization chip.
4. The switching device of claim 1, wherein the lithium battery measurement signal is generated by a voltage difference between an anode and a cathode of the lithium battery to be tested, or a microcontroller monitoring a state of the lithium battery.
5. The switching device of claim 1, wherein the first field effect transistor (Q1), the second field effect transistor (Q2), the third field effect transistor (Q3) and the fifth field effect transistor (Q5) are N-type field effect transistors; the fourth field effect transistor (Q4) is a P-type field effect transistor.
6. The switching device of claim 1, wherein the first square wave generating circuit and the second square wave generating circuit generate voltage signals by using a resonant circuit formed by a capacitor and a resistor, and the frequency of the generated voltage signals is 100kHz-1 MHz.
7. The switching device of claim 1, wherein the first transformer (T1) and the second transformer (T2) share a magnetic core.
8. A switching method of a lithium ion battery based on the device of any one of claims 1 to 7, characterized in that the method comprises the following steps:
when the anode of the lithium battery to be tested is connected with the source electrode of the first field effect transistor (Q1), and the cathode of the lithium battery to be tested is connected with the source electrode of the second field effect transistor (Q2);
(11) the lithium battery detection circuit collects a lithium battery measurement signal and a lithium battery reference signal; if the amplitude of the lithium battery measurement signal is higher than the amplitude of the lithium battery reference signal, the lithium battery detection circuit outputs a positive signal and enters the step (12), otherwise, a negative signal is output and enters the step (13);
(12) the third field effect tube (Q3) and the first field effect tube (Q1) are connected, the fourth field effect tube (Q4), the fifth field effect tube (Q5) and the second field effect tube (Q2) are disconnected, the lithium battery to be tested is connected to the battery pack, and the operation is finished;
(13) the first field effect tube (Q1) and the third field effect tube (Q3) are turned off, the fourth field effect tube (Q4), the fifth field effect tube (Q5) and the second field effect tube (Q2) are turned on, and the lithium battery to be tested is switched out of the battery pack;
when the anode of the lithium battery to be tested is connected with the source electrode of the second field-effect tube (Q2) and the cathode of the lithium battery to be tested is connected with the source electrode of the first field-effect tube (Q1):
(21) the lithium battery detection circuit collects a lithium battery measurement signal and a lithium battery reference signal; if the amplitude of the lithium battery measurement signal is higher than the amplitude of the lithium battery reference signal, the lithium battery detection circuit outputs a negative signal and enters the step (22), otherwise, a positive signal is output and enters the step (23);
(22) the third field effect tube (Q3) and the first field effect tube (Q1) are turned off, the fourth field effect tube (Q4), the fifth field effect tube (Q5) and the second field effect tube (Q2) are turned on, the lithium battery to be tested is switched out of the battery pack, and the operation is finished;
(23) the first field effect transistor (Q1) and the third field effect transistor (Q3) are connected, the fourth field effect transistor (Q4), the fifth field effect transistor (Q5) and the second field effect transistor (Q2) are disconnected, and the lithium battery to be tested is connected to the battery pack.
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| US8148942B2 (en) * | 2009-11-05 | 2012-04-03 | O2Micro International Limited | Charging systems with cell balancing functions |
| CN102331561B (en) * | 2011-09-16 | 2013-06-26 | 深圳桑达国际电子器件有限公司 | Battery voltage detection circuit and battery management system |
| CN203933055U (en) * | 2013-12-23 | 2014-11-05 | 杭州电子科技大学 | A kind of battery equalizing circuit based on Flyback converter |
| US9761918B2 (en) * | 2015-09-10 | 2017-09-12 | Ford Global Technologies, Llc | Vehicle traction battery assembly |
| CN207234432U (en) * | 2016-12-06 | 2018-04-13 | 东莞新能德科技有限公司 | Charge protector and charging circuit |
| CN206790353U (en) * | 2017-05-22 | 2017-12-22 | 广州视源电子科技股份有限公司 | Isolation transformer driving circuit |
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