CN2826789Y - Charge/discharge protection circuit of lithium ion battery pack for electric vehicle - Google Patents
Charge/discharge protection circuit of lithium ion battery pack for electric vehicle Download PDFInfo
- Publication number
- CN2826789Y CN2826789Y CNU2005200277966U CN200520027796U CN2826789Y CN 2826789 Y CN2826789 Y CN 2826789Y CN U2005200277966 U CNU2005200277966 U CN U2005200277966U CN 200520027796 U CN200520027796 U CN 200520027796U CN 2826789 Y CN2826789 Y CN 2826789Y
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- cell
- protection circuit
- optocoupler
- integrated chip
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Abstract
The utility model relates to a charge and discharge protection circuit of a lithium ion battery pack for an electric bicycle, which comprises discharge protection circuits and charge protection circuits; a lithium ion battery pack is formed by the series connection of a plurality of monomer batteries; the positive pole end and the negative pole end of each of the monomer batteries are respectively connected each of the discharge protection circuit and each of the charge protection circuit which are separately controlled; a discharge protection circuit and a charge protection circuit are arranged on each of the monomer batteries, wherein the discharge protection circuit is composed of an integrated chip, a coupling device, an MOSFET tube, a resistor and a capacitor, and the charge protection circuit is composed of an integrated chip, a coupling device, an MOSFET tube, an amplifier, a transformer, an inductor, a thyristor, a diode, a capacitor and a resistor. The circuit has the function of overcharge prevention, overdischarge prevention and overcurrent prevention of the battery pack and ensures that each battery in the process of charge and discharge is in the optimum state; the service life of the battery pack is extended, and the electrical property is improved. The circuit is effectively used for a lithium ion battery pack of an electric bicycle and can be widely used for other large power battery packs which are connected in series.
Description
Technical field
The utility model relates to a kind of lithium ionic battery protection circuit, particularly a kind of electric vehicle lithium ion battery group charge-discharge protection circuit.
Background technology
At present, a lot of companies develop the lithium ion battery protection integrated circuit (IC) chip of various different parameters, adopt lithium ion battery protecting plate that chip constitutes successful Application in the lithium-ion electric product-derived.Prevent effectively that overcharging from use appearring in battery pack or the fail safe of over-discharge state, assurance battery and avoid occurring electrical property and worsen phenomenon.
In the prior art, what protective circuit adopted is the Passive Control technology, promptly in charging process, has the charging voltage of any cell to surpass the maximum that lithium battery allows in battery pack, cuts off charge circuit; In discharge process, when the discharge voltage that any cell is arranged in the battery pack is lower than the minimum voltage of lithium battery permission, cut off discharge loop.Can not effectively control the charging of battery according to the performance difference of cell.Because the difference on the cell performance parameter, the serial number of battery pack is big more, and the life-span of battery pack is low more.
The utility model content
The utility model is for solving problems of the prior art; provide a kind of discharge prevention can be provided; simultaneously can provide charge protection again, and guarantee that each cell can both be charged to the electric vehicle lithium ion battery group charge-discharge protection circuit of full power state.
The utility model for the technical scheme that solves the technical problem employing that exists in the known technology is: electric vehicle lithium ion battery group charge-discharge protection circuit, comprise discharge protection circuit and charging circuit, described battery pack is made of some cell series connection, every cell positive and negative end connects the discharge protection circuit and the charging circuit of independent control respectively, and the independent discharge protection circuit of controlling is that FS32 integrated chip, an optocoupler, a 2N700 type MOSFET pipe, two resistance and a capacitor constitute by a model on every cell; Charging circuit on every cell is NCP1200AP60 integrated chip, a PC817 by a model
2Optocoupler, an IRF640 type MOSFET pipe, a CA358 amplifier, a transformer, two inductance, two controllable silicons, seven diodes, seven capacitors and 11 resistance constitute, and its annexation is as described below:
Discharge protection circuit: 1 pin of integrated chip FS32 is connected with the grid of MOSFET pipe; MOSFET pipe drain D is connected with 1 pin of optocoupler; Negative pole with cell behind the MOSFET pipe source S one side series resistor R2 joins, and is connected with 2 pin of optocoupler on the other hand; 6 pin of the negative pole of every cell and integrated chip FS32 join; 5 pin with integrated chip FS32 behind the positive pole of cell and the series resistor R1 join; Capacitor C is connected across between 5 pin and 6 pin of integrated chip FS32; 4 pin of optocoupler connect 3 pin of next cell optocoupler, and 3 pin of optocoupler connect 4 pin of a last cell optocoupler; Battery anode is connected with 3 pin of high-end optocoupler; The battery pack negative pole is connected with the source electrode of total MOS switching tube.
Charge protector: input DC+ is connected with 8 pin of integrated chip NCP1200AP60 with inductance L 1 serial connection back; 8 pin of integrated chip NCP1200AP60 are connected with switch transformer T1, capacitor C1 are anodal; 6 pin of integrated chip NCP1200AP60 are connected with the positive pole of capacitor C2; 4 pin of integrated chip NCP1200AP60,3 pin of optocoupler U3 and input DC-connect together together; Cross-over connection capacitor C 6 between 2,3 pin of NCP1200AP60; 2 pin of NCP1200AP60 are connected with 4 pin of optocoupler; Cross-over connection resistance R s between 3,4 pin of NCP1200AP60; Cross-over connection diode D1 ground connection between 1,2 pin of transformer T1; The grid G of metal-oxide-semiconductor is connected with 5 pin of NCP1200AP60; The drain D of metal-oxide-semiconductor is connected with 2 pin of switch transformer; The source S of metal-oxide-semiconductor is connected with 3 pin of NCP1200AP60; 3 pin of switch transformer are connected with the anode of D2, D3; 4 pin of switch transformer are connected with the anode of D4, D5; The negative electrode of D2, D3, D4, D5 also meets back tandem electric inductance L2 and is connected with the positive pole of cell; Be connected with the negative pole of cell behind the 4 pin serial connection current-limiting resistance Rs of switch transformer; The cell negative pole is by U5, and resistance R 5, R6, R7, R8 connect 2,3 pin of amplifier U9A respectively, by U4, rheostat Rd, two series resistance R9, R10 and anode formation loop.
The utility model can also take following technical measures to realize: described battery pack is an one by 10 cell series connection; The circuit that the cell of described battery pack except that the head and the tail cell connects between from the positive pole to the negative pole successively is identical; And the negative outside wire of last cell and adjacent monomer anode lead-out wire are same line.
Advantage and the good effect that the utlity model has are: when the discharge voltage of a certain cell in the battery pack reaches control final pressure; circuitry cuts battery power discharge loop; guaranteed the reliability of charge protection plate and battery pack; improve the performance and the life-span of battery pack effectively, be specially adapted to electric bicycle with in the lithium ion battery group.
Description of drawings
Accompanying drawing 1 is a battery power discharge control circuit schematic diagram;
Accompanying drawing 2 is cell charging control circuit figure;
Accompanying drawing 3 is a lithium ion battery group charge-discharge protection circuit structured flowchart.
Embodiment
Electric vehicle lithium ion battery group charge-discharge protection circuit, comprise discharge protection circuit and charging circuit, described battery pack is made of 10 cell series connection, every cell positive and negative end connects the discharge protection circuit and the charging circuit of independent control respectively in described 10 cells, on described every cell separately the discharge protection circuit of control be that FS32 integrated chip, an optocoupler, a 2N700 type MOSFET pipe, two resistance and a capacitor constitute by a model; Charging circuit on described arbitrary cell is NCP1200AP60 integrated chip, a PC817 by a model
2Optocoupler, an IRF640 type MOSFET pipe, a CA358 amplifier, a transformer, two inductance, two controllable silicons, seven diodes, seven capacitors and 11 resistance constitute, and its annexation is:
The connection of discharge protection circuit is as follows: 1 pin of integrated chip FS32 is connected with the grid of MOSFET pipe; MOSFET pipe drain D is connected with 1 pin of optocoupler; Negative pole with cell behind the MOSFET pipe source S one side series resistor R2 joins, and is connected with 2 pin of optocoupler on the other hand; 6 pin of the negative pole of every cell and integrated chip FS32 join; 5 pin with integrated chip FS32 behind the positive pole of cell and the series resistor R1 join; Capacitor C is connected across between 5 pin and 6 pin of integrated chip FS32; 4 pin of optocoupler connect 3 pin of next cell optocoupler, and 3 pin of optocoupler connect 4 pin of a last cell optocoupler; Battery anode is connected with 3 pin of high-end optocoupler; The battery pack negative pole is connected with the source electrode of total MOS switching tube.
The connection of charge protector is as follows: input DC+ is connected with 8 pin of integrated chip NCP1200AP60 with inductance L 1 serial connection back; 8 pin of integrated chip NCP1200AP60 are connected with switch transformer T1, capacitor C1 are anodal; 6 pin of integrated chip NCP1200AP60 are connected with the positive pole of capacitor C2; 4 pin of integrated chip NCP1200AP60,3 pin of optocoupler U3 and input DC-connect together together; Cross-over connection capacitor C 6 between 2,3 pin of NCP1200AP60; 2 pin of NCP1200AP60 are connected with 4 pin of optocoupler; Cross-over connection resistance R s between 3,4 pin of NCP1200AP60; Cross-over connection diode D1 ground connection between 1,2 pin of transformer T1; The grid G of metal-oxide-semiconductor is connected with 5 pin of NCP1200AP60; The drain D of metal-oxide-semiconductor is connected with 2 pin of switch transformer; The source S of metal-oxide-semiconductor is connected with 3 pin of NCP1200AP60; 3 pin of switch transformer are connected with the anode of D2, D3; 4 pin of switch transformer are connected with the anode of D4, D5; The negative electrode of D2, D3, D4, D5 also meets back tandem electric inductance L2 and is connected with the positive pole of cell; Be connected with the negative pole of cell behind the 4 pin serial connection current-limiting resistance Rs of switch transformer; The cell negative pole is by U5, and resistance R 5, R6, R7, R8 connect 2,3 pin of amplifier U9A respectively, by U4, rheostat Rd, two series resistance R9, R10 and anode formation loop.
The welding of discharge prevention and test:, must guarantee that the discharge prevention plate can reliably working for guaranteeing the fail safe of battery pack; Because adopt special-purpose single-unit lithium ion battery protection chip, the performance parameter comparative maturity of chip is stable, therefore mainly guarantees from pcb board design, welding procedure, detection means; Adopt mount components, and by the machine welding, all wiring boards elder generation welding protection parts, and weld live part again after qualified through detecting are tested after whole wiring board is must be through 24 hours aging again, and test unit protection magnitude of voltage is 2.25V ± 0.025V.The discharge protection circuit of battery pack is made of single-unit lithium ion battery protection chip and MOSFET pipe.When the discharge voltage of cell is reduced to 2.50V ± 50mV or during overcurrent, chip 1 pin is an electronegative potential by the high potential saltus step, and this signal drives the field effect transistor in the discharge loop, thereby cuts off total discharge loop after optocoupler is isolated.
The welding and the test of charging conversion line: through the qualified circuit board of discharge examination, the components and parts of welding charging conversion portion circuit, and carried out conversion testing, the magnitude of voltage when the test charging is switched: 4.25V ± 0.025V after aging through 24 hours.Charging control section divides employing to constitute 10 road DC-DC charge circuits by chip NCP1200, and switching frequency is 60KHz, and wiring board adopts SMD design, thereby reduced volume improves reliability, reduces caloric value.Charging modes adopts constant current-constant voltage mode, and charging current is 1A, and charging final pressure is 4.20V～4.25V.
The welding of monomer charging circuit: through the circuit board of above-mentioned test passes, weld the components and parts of 10 road monomer charging circuits, and carried out conversion testing after aging through 24 hours.The magnitude of voltage of test single channel charging is 4.25V ± 0.025V, and charging current value is 1.0A ± 0.01A.
In discharge process; this circuit adopts 10 integrated chips in order to detect the voltage of each lithium ion battery; when any cell discharge voltage in the battery pack reaches the setting threshold values; the grid of power N-channel MOS FET is placed electronegative potential; cut off discharge loop, battery pack is played defencive function.In order to reduce the caloric value in the charging process effectively, battery pack is taked the control model of whole Battery pack group charging at the charging initial stage, when the voltage that a certain cell arranged in the battery pack reaches set point, switch the charge circuit of whole Battery pack group charging, connect the control loop of cell charging, battery pack is further charged, and all is charged to 4.20V ± 0.025V (till or the 4.25V ± 0.025V) until each cell.
In the charging process, this circuit adopts 10 road DC/DC charge circuits, each lithium ion battery is implemented accurate constant current-constant voltage charge control, when guaranteeing that charging finishes, each lithium ion battery can both reach best state-of-charge, thus the performance and the life-span of improving battery pack effectively.
For satisfying the actual working environment requirement of electric bicycle power supply, with wiring board through the water-proofing treatment of spraying paint after, be sealed in fire-retardant plastic housing after, whole electric vehicle lithium battery special charging and baffle are installed in the battery housing.
Claims (3)
1. electric vehicle lithium ion battery group charge-discharge protection circuit, comprise many groups discharge protection circuit and the charge protector formation of control separately, described independent control discharge protection circuit is made of an integrated chip FS32, an optocoupler, a 2N700 type MOSFET pipe, two resistance and a capacitor; Described independent control charging circuit is by an integrated chip NCP1200AP60, a PC817
2Optocoupler, an IRF640 type MOSFET pipe, a CA358 amplifier, a switch transformer, two inductance, two controllable silicons, seven diodes, seven capacitors and 11 resistance constitute; The lithium ion battery group is made of some cell series connection, and every cell positive and negative end connects the discharge protection circuit and the charge protector of independent control respectively, it is characterized in that:
The connection of described discharge protection circuit is as follows: 1 pin of integrated chip FS32 is connected with the grid of MOSFET pipe; MOSFET pipe drain D is connected with 1 pin of optocoupler; Negative pole with cell behind the MOSFET pipe source S one side series resistor R2 joins, and is connected with 2 pin of optocoupler on the other hand; 6 pin of the negative pole of every cell and integrated chip FS32 join; 5 pin with integrated chip FS32 behind the positive pole of cell and the series resistor R1 join; Capacitor C is connected across between 5 pin and 6 pin of integrated chip FS32; 4 pin of optocoupler connect 3 pin of next cell optocoupler, and 3 pin of optocoupler connect 4 pin of a last cell optocoupler; Battery anode is connected with 3 pin of high-end optocoupler; The battery pack negative pole is connected with the source electrode of total MOS switching tube.
The connection of described charge protector is as follows: input DC+ is connected with 8 pin of integrated chip NCP1200AP60 with inductance L 1 serial connection back; 8 pin of integrated chip NCP1200AP60 are connected with switch transformer T1, capacitor C1 are anodal; 6 pin of integrated chip NCP1200AP60 are connected with the positive pole of capacitor C2; 4 pin of integrated chip NCP1200AP60,3 pin of optocoupler U3 and input DC-connect together together; Cross-over connection capacitor C 6 between 2,3 pin of NCP1200AP60; 2 pin of NCP1200AP60 are connected with 4 pin of optocoupler; Cross-over connection resistance R s between 3,4 pin of NCP1200AP60; Cross-over connection diode D1 ground connection between 1,2 pin of transformer T1; The grid G of metal-oxide-semiconductor is connected with 5 pin of NCP1200AP60; The drain D of metal-oxide-semiconductor is connected with 2 pin of switch transformer; The source S of metal-oxide-semiconductor is connected with 3 pin of NCP1200AP60; 3 pin of switch transformer are connected with the anode of D2, D3; 4 pin of switch transformer are connected with the anode of D4, D5; The negative electrode of D2, D3, D4, D5 also meets back tandem electric inductance L2 and is connected with the positive pole of cell; Be connected with the negative pole of cell behind the 4 pin serial connection current-limiting resistance Rs of switch transformer; The cell negative pole passes through U5; resistance R 5, R6, R7, R8 connect 2,3 pin of amplifier U9A respectively; form the loop by U4, rheostat Rd, two series resistance R9, R10 and anode, each cell in the battery pack is carried out charge and discharge protecting control separately.
2. electric vehicle lithium ion battery group charge-discharge protection circuit according to claim 1 is characterized in that: described battery pack is an one by 10 cell series connection;
3. electric vehicle lithium ion battery group charge-discharge protection circuit according to claim 1 is characterized in that: the circuit that the cell of described battery pack except that the head and the tail cell connects between from the positive pole to the negative pole successively is identical; And the negative outside wire of last cell and adjacent monomer anode lead-out wire are same line.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2005200277966U CN2826789Y (en) | 2005-10-14 | 2005-10-14 | Charge/discharge protection circuit of lithium ion battery pack for electric vehicle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2005200277966U CN2826789Y (en) | 2005-10-14 | 2005-10-14 | Charge/discharge protection circuit of lithium ion battery pack for electric vehicle |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2826789Y true CN2826789Y (en) | 2006-10-11 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2005200277966U Expired - Fee Related CN2826789Y (en) | 2005-10-14 | 2005-10-14 | Charge/discharge protection circuit of lithium ion battery pack for electric vehicle |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2826789Y (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103247829A (en) * | 2012-02-10 | 2013-08-14 | 罗征南 | Storage battery having unit cell protection function and connecting method thereof |
| CN108400636A (en) * | 2018-03-23 | 2018-08-14 | 刘铭新 | Battery set charge/discharge manages system and method |
-
2005
- 2005-10-14 CN CNU2005200277966U patent/CN2826789Y/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103247829A (en) * | 2012-02-10 | 2013-08-14 | 罗征南 | Storage battery having unit cell protection function and connecting method thereof |
| CN108400636A (en) * | 2018-03-23 | 2018-08-14 | 刘铭新 | Battery set charge/discharge manages system and method |
| CN108400636B (en) * | 2018-03-23 | 2020-08-07 | 刘铭新 | Battery pack charging and discharging management system and method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |