CN100527556C - Multi-section lithium ion battery pack protection circuit - Google Patents
Multi-section lithium ion battery pack protection circuit Download PDFInfo
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- CN100527556C CN100527556C CNB2006100144520A CN200610014452A CN100527556C CN 100527556 C CN100527556 C CN 100527556C CN B2006100144520 A CNB2006100144520 A CN B2006100144520A CN 200610014452 A CN200610014452 A CN 200610014452A CN 100527556 C CN100527556 C CN 100527556C
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- microprocessor
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- effect transistor
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Abstract
The invention relates to a multi-section lithium battery group protective circuit, comprising a microprocessor IC1, a stabilizer IC2, a resistance division network, a discharge MOS field-effect tube Q1, and a charge MOS field-effect tube Q2. The invention is characterized in that th resistance division network is connected with the microprocessor ANx, the invention uses the microprocessor chip IC1 as control core and uses periphery precision resistance network to sample the voltage of each monomer battery in a battery group, to control the charge and discharge MOS field-effect tubes, to avoid over discharge or charge. The invention has simple circuit and high reliability. The invention uses the microprocessor chip IC1, the stabilizer chip IC2, the MOS field-effect tubes Q1 and Q2 to simplify hardware circuit, reduce element number, reduce volume, and expand the application range of lithium battery group.
Description
Technical field
The invention belongs to the lithium ion battery technical field of safety devices, particularly relate to a kind of multi-section lithium ion battery pack protection circuit.
Background technology
Because the lithium ion battery self characteristics, when it is overcharging, during overdischarge, all can damage battery, the light lost of life then, heavy then battery explosion or inefficacy, so in order to prevent the generation of security incident, the lithium ion battery group must be equipped with protective circuit.
It is at present known that what add that metal-oxide-semiconductor field effect transistor constitutes by dedicated IC chip is lithium ion battery pack protection circuits such as MM1414, MAX1924 as model; play the protective effect of overvoltage, under-voltage, overcurrent; but because the restriction of integrated circuit technology; the internal threshold parameter is withstand voltage to be 26V, can only be used for the lithium ion battery group that the 1-4 batteries is formed.
The lithium ion battery pack protection circuit that the above battery of present 5 joints is formed all is to adopt discrete component or 1-4 joint protective circuit special chip to be in series.Discrete component constitutes sampling, the comparison of protective circuit by voltage, judges whether to overcharge, overdischarge, and then the discharging and recharging of control battery pack.The circuit theory of this mode is simple, but every battery all needs 1 cover to detect decision circuitry, and quiescent dissipation is very big, and along with the battery serial number increases and the power consumption increase, is unfavorable for the charged maintenance of battery.The protective circuit that adopts 1-4 joint protective circuit special chip to be in series; though the index of power consumption is not high; but the protective circuit chip that needs 2 or 3 special-purpose 1-4 strings; cost is higher; and poor reliability, because the voltage endurance of its chip, under the situation of some inductive load; very easily damage, the use to the lithium ion battery group has brought potential safety hazard like this.
Summary of the invention
The present invention is for solving problems of the prior art; the voltage sampling circuit of a kind of each cell from connecting successively between the total negative pole of positive best is provided; voltage signal is sent among the microprocessor chip IC1; under the control of program; carrying out voltage ratio judges, delays time and control; the field effect transistor Q1 of the low conducting resistance of control, the break-make of Q2, and then the break-make of control whole battery group, thus constitute charge and discharge protecting.The multi-section lithium ion battery protecting circuit can be used for the protection of 1-10 joint lithium ion battery group.The every joint lithium ion battery of this circuit protection, preventing to overcharge, be rivals in a contest excessively, it damages.
The present invention for the technical scheme that solves the technical problem employing that exists in the known technology is:
Multi-section lithium ion battery pack protection circuit comprises microprocessor IC1, pressurizer IC2, resistance pressure-dividing network, discharge metal-oxide-semiconductor field effect transistor Q1 and charging metal-oxide-semiconductor field effect transistor Q2, is characterized in:
Described resistance pressure-dividing network is two groups of parallel resistances that number is identical, be respectively the first resistor group R1-R6 and the second resistor group R7-R12, and the resistance number in first resistor group and second resistor group all equals cell B1.1-B1.6 number in the battery pack;
The first resistor group R1-R6, one end is connected with microprocessor grounding leg GND, pressurizer grounding leg, the drain electrode of discharge metal-oxide-semiconductor field effect transistor and battery pack negative pole, and the other end of first each resistance of resistor group, each resistance one end of second resistor group and the microprocessor first pin ANO, microprocessor crus secunda AN1, microprocessor tripod AN2, microprocessor the 4th pin AN3, microprocessor the 5th pin AN4, microprocessor the 6th pin AN5 are corresponding respectively to be connected;
The anodal corresponding connection of cell in each resistance other end of second resistor group and the battery pack, wherein the resistance terminal that is connected with the battery anode output also is connected with the output pin of pressurizer;
Filtering capacitor C1 in parallel between pressurizer IC2 input pin that is connected with power supply of microprocessor pin VDD and the pressurizer IC2 grounding leg;
Described discharge metal-oxide-semiconductor field effect transistor Q1 source electrode, lining and described charging metal-oxide-semiconductor field effect transistor Q2 source electrode, lining are connected, and the metal-oxide-semiconductor field effect transistor Q1 grid that wherein discharges is connected with microprocessor discharge pin DIS by the first current-limiting resistance R13; Charging metal-oxide-semiconductor field effect transistor grid is connected with microprocessor charging pin CHR by the second current-limiting resistance R14; The drain electrode of charging metal-oxide-semiconductor field effect transistor connects the battery pack output.
Advantage and good effect that the present invention has are: owing to use the core of microprocessor IC1 as control, voltage by each cell in the precision resistance network sampling battery pack of periphery, control charge and discharge metal-oxide-semiconductor field effect transistor switch avoids battery to overcharge or over-discharge can.Circuit is simple, reliability is high.Owing to adopted microprocessor IC1, pressurizer IC2, metal-oxide-semiconductor field effect transistor Q1, Q2, simplified hardware circuit design, reduced component number, dwindled volume.Widen the application of lithium ion battery group.
Description of drawings
Fig. 1 is a multi-section lithium ion battery pack protection circuit schematic diagram of the present invention.
Label among the figure is respectively: R1-R6 is first resistor group; R7-R12 is second resistor group; R13 is first current-limiting resistance; R14 is second current-limiting resistance; Q1 is the discharge metal-oxide-semiconductor field effect transistor; Q2 is the charging metal-oxide-semiconductor field effect transistor; B1.1-B1.6 is a cell; C1 is a filtering capacitor; IC1 is a microprocessor; IC2 is a pressurizer; ANO is microprocessor first pin; AN1 is the microprocessor crus secunda; AN2 is the microprocessor tripod; AN3 is microprocessor the 4th pin; AN4 is microprocessor the 5th pin; AN5 is microprocessor the 6th pin; CHR is a microprocessor charging pin; DIS is a microprocessor discharge pin; GND is the microprocessor grounding leg; VDD is the power supply of microprocessor pin.
Embodiment
For further understanding summary of the invention of the present invention, characteristics and effect, enumerate following examples now, and conjunction with figs. is described in detail as follows:
With reference to accompanying drawing 1, being connected into battery pack with 6 joint lithium ion single battery B1.1-B1.6 is example, it is the microprocessor IC1 chip of PIC16C774, the pressurizer IC2 chip that model is MAX1615, discharge metal-oxide-semiconductor field effect transistor Q1 and the charging metal-oxide-semiconductor field effect transistor Q2 that model is IRF7413 that preparation chooses the first resistor group R1-R6 in filtering capacitor C1,12 divider resistances and the second resistor group R7-R12, the first current-limiting resistance R13 and the second current-limiting resistance R14, model, and printed circuit board (PCB), at the printed circuit board surface prefluxing; Above-mentioned microprocessor IC1 chip, pressurizer IC2 chip, discharge metal-oxide-semiconductor field effect transistor Q1 and charging metal-oxide-semiconductor field effect transistor Q2 also can adopt the chip of similar functions.
PACK+, PACK-are the output of battery pack, the positive pole of 6 joint lithium ion single battery B1.1-B1.6 links to each other with the pin of the second resistor group R7-R12 respectively successively, another pin of the second resistor group R7-R12 links to each other with the pin of the first resistor group R1-R6 respectively successively, another pin of the first resistor group R1-R6 is connected with grounding leg and the microprocessor grounding leg GND of cell B1.6 negative pole, pressurizer IC2 simultaneously, forms resistance pressure-dividing network; The pin that links to each other with the first resistor group R1-R6 among the second resistor group R7-R12 is connected with the 6th pin AN5, the 5th pin AN4, the 4th pin AN3, tripod AN2, crus secunda AN1, the first pin ANO of microprocessor IC1 respectively more successively, as the input of cell voltage.The discharge pin DIS of microprocessor IC1 is connected with the first current-limiting resistance R13, one pin, and first another pin of current-limiting resistance R13 is connected the control discharge with discharge metal-oxide-semiconductor field effect transistor Q1 grid; Discharge metal-oxide-semiconductor field effect transistor Q1 source electrode, lining are connected with charging metal-oxide-semiconductor field effect transistor Q2 source electrode, lining; The CHR pin of microprocessor IC1 links to each other with the second current-limiting resistance R14, one pin, and second another pin of current-limiting resistance R14 is connected the control charging with charging metal-oxide-semiconductor field effect transistor Q2 grid; Pressurizer IC2 output pin connects cell B1.1 positive pole, pressurizer IC2 earth terminal pin connects cell B1.6 negative pole, pressurizer IC2 input pin connects power supply of microprocessor pin VDD, wherein filter capacitor C1 in parallel between pressurizer IC2 input pin and the pressurizer IC2 earth terminal pin; Pin after discharge metal-oxide-semiconductor field effect transistor Q1 drain electrode and microprocessor grounding leg GND, the first resistor group R1-R6 parallel connection, the filter capacitor C1 pin that is connected with cell B1.6 negative pole are connected with cell B1.6 negative pole; Charging metal-oxide-semiconductor field effect transistor Q2 drain electrode connects the output PACK-of battery pack; The positive pole of cell B1.1 connects the output PACK+ of battery pack.
The protective circuit operation principle is as follows:
The total voltage of battery pack produces stable+5V direct voltage by pressurizer IC2, is microprocessor IC1 power supply.The resistance pressure-dividing network that utilizes R1-R12 to form; to the voltage sampling circuit of each cell from connecting successively between positive best negative pole; obtain the terminal voltage of each battery cell in the lithium ion battery group; send into the analog input channel of microprocessor IC1 successively; control by microprocessor IC1; make the terminal voltage of each cell; reference voltage compares; the break-make of control discharge metal-oxide-semiconductor field effect transistor Q1 and charging metal-oxide-semiconductor field effect transistor Q2; any cell voltage surpasses additives for overcharge protection voltage in battery pack; when perhaps being lower than over voltage; discharge metal-oxide-semiconductor field effect transistor Q1 and charging metal-oxide-semiconductor field effect transistor Q2 turn-off; and then the break-make of control whole battery group, avoid battery to overcharge or over-discharge can, constitute charge and discharge protecting.Microprocessor IC1 enters resting state, arrives up to charging signals and just can wake up, has stoped the deep discharge of battery, has reduced power consumption.
Claims (1)
1, multi-section lithium ion battery pack protection circuit comprises microprocessor (IC1), pressurizer (IC2), resistance pressure-dividing network, discharge metal-oxide-semiconductor field effect transistor (Q1) and charging metal-oxide-semiconductor field effect transistor (Q2), it is characterized in that:
Described resistance pressure-dividing network is two groups of parallel resistances that number is identical, be respectively first resistor group (R1-R6) and second resistor group (R7-R12), and the resistance number in first resistor group and second resistor group all equals cell in the battery pack (B1.1-B1.6) number;
First resistor group (R1-R6) end is connected with microprocessor grounding leg (GND), pressurizer grounding leg, the drain electrode of discharge metal-oxide-semiconductor field effect transistor and battery pack negative pole, and the other end of first each resistance of resistor group, each resistance one end of second resistor group and microprocessor first pin (AN0), microprocessor crus secunda (AN1), microprocessor tripod (AN2), microprocessor the 4th pin (AN3), microprocessor the 5th pin (AN4), microprocessor the 6th pin (AN5) are corresponding respectively to be connected;
The anodal corresponding connection of cell in each resistance other end of second resistor group and the battery pack, wherein the resistance terminal that is connected with the battery anode output also is connected with the output pin of pressurizer;
A filtering capacitor (C1) in parallel between pressurizer (IC2) input pin that is connected with power supply of microprocessor pin (VDD) and pressurizer (IC2) grounding leg;
Described discharge metal-oxide-semiconductor field effect transistor (Q1) source electrode, lining and described charging metal-oxide-semiconductor field effect transistor (Q2) source electrode, lining are connected, and the metal-oxide-semiconductor field effect transistor that wherein discharges (Q1) grid is connected with microprocessor discharge pin (DIS) by first current-limiting resistance (R13); Charging metal-oxide-semiconductor field effect transistor grid is connected with microprocessor charging pin (CHR) by second current-limiting resistance (R14); The drain electrode of charging metal-oxide-semiconductor field effect transistor connects the battery pack output.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006100144520A CN100527556C (en) | 2006-06-27 | 2006-06-27 | Multi-section lithium ion battery pack protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006100144520A CN100527556C (en) | 2006-06-27 | 2006-06-27 | Multi-section lithium ion battery pack protection circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101098074A CN101098074A (en) | 2008-01-02 |
| CN100527556C true CN100527556C (en) | 2009-08-12 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2006100144520A Expired - Fee Related CN100527556C (en) | 2006-06-27 | 2006-06-27 | Multi-section lithium ion battery pack protection circuit |
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| CN (1) | CN100527556C (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102684165B (en) * | 2011-03-07 | 2015-07-22 | 比亚迪股份有限公司 | Charge and discharge protection circuit for multi-section lithium battery |
| CN103296242A (en) * | 2013-05-07 | 2013-09-11 | 浙江努奥罗新能源科技有限公司 | Lithium battery protection plate |
| CN111835048B (en) * | 2019-04-22 | 2022-07-15 | 添可智能科技有限公司 | Charging and discharging switching circuit and electronic equipment |
| CN111464178B (en) * | 2020-02-28 | 2023-09-22 | 青岛能蜂电气有限公司 | Plug-and-play interface circuit |
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2006
- 2006-06-27 CN CNB2006100144520A patent/CN100527556C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| CN101098074A (en) | 2008-01-02 |
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Granted publication date: 20090812 Termination date: 20130627 |