CN203660517U - Additional automatic recovery device of lithium battery protection circuit - Google Patents
Additional automatic recovery device of lithium battery protection circuit Download PDFInfo
- Publication number
- CN203660517U CN203660517U CN201420012882.9U CN201420012882U CN203660517U CN 203660517 U CN203660517 U CN 203660517U CN 201420012882 U CN201420012882 U CN 201420012882U CN 203660517 U CN203660517 U CN 203660517U
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- Prior art keywords
- battery
- semiconductor
- oxide
- lithium battery
- pnp transistor
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Links
- 229910052744 lithium Inorganic materials 0.000 title claims abstract description 28
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 title claims abstract description 27
- 238000011084 recovery Methods 0.000 title claims abstract description 9
- 239000004065 semiconductor Substances 0.000 claims description 49
- 230000001681 protective effect Effects 0.000 claims description 11
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 8
- 229910001416 lithium ion Inorganic materials 0.000 description 8
- 230000006870 function Effects 0.000 description 3
- 238000001514 detection method Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000000654 additive Substances 0.000 description 1
- 239000003990 capacitor Substances 0.000 description 1
- 230000005779 cell damage Effects 0.000 description 1
- 208000037887 cell injury Diseases 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 231100001261 hazardous Toxicity 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000003446 memory effect Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
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- Charge And Discharge Circuits For Batteries Or The Like (AREA)
- Secondary Cells (AREA)
Abstract
The utility model relates to an additional automatic recovery device of a lithium battery protection circuit. The device is used in electric tools. An S-8254-based lithium battery protection circuit is connected with a motor through an electric tool switch. The device comprises a PNP-type transistor Q3, an N-type MOS tube Q4 and a resistor R5, wherein the emitter of the PNP-type transistor Q3 is connected with the positive end of a battery core, the collector of the PNP-type transistor Q3 is connected with the positive end P<+> of a battery through the resistor R5, the base of the PNP-type transistor Q3 is connected with the drain of the N-type MOS tube Q4, the source of the N-type MOS tube Q4 is connected with the grounding end VSS of the S-8254-based lithium battery protection circuit, and the gate of the N-type MOS tube Q4 is connected with a discharge-end DIS and is connected in parallel with the negative end of the battery. Manual operation is greatly reduced, the actual need for enabling an electric tool to work continuously and be in a frequent ultimate using state is satisfied, and the utilization efficiency of electric tools is improved.
Description
Technical field
The utility model relates to a kind of lithium battery protection circuit of protecting rear automatic recovery, is mainly used in the field of power tools that uses Seiko S-8254 series Li battery protection IC.
Background technology
Lithium battery has environmental protection, energy is high, lightweight, volume is little, long service life, there is no the advantages such as memory effect, is current most popular secondary rechargeable battery.Although lithium battery has multiple advantage, it once battery is in extreme use state, very likely causes cell damage in use.This not only affects capacity and the life-span of battery, more may cause battery explosion, the hazardous accidents such as on fire.So lithium battery needs to coordinate installation protective circuit in use.
S-8254 family chip is as battery protecting circuit; there is built-in high-accuracy voltage testing circuit and delay circuit; can carry out high-accuracy voltage detection for each batteries; realize single-unit additives for overcharge protection and single-unit over; and possess three sections of overcurrent detections; can arrange to overcharge by external capacitor and detect that time of delay, overdischarge are detected time of delay and overcurrent detects time of delay 1, and overcurrent detects time of delay 2 and overcurrent and detects and be fixed at chip internal time of delay 3.The charge and discharge protection voltage of S-8254 family chip and overcurrent detect voltage take 50mV as advanced unit, according to the user demand of different occasions, can select corresponding applicable model.
As shown in the standard application circuit of the S-8254 of Fig. 1, charge-discharge circuit comprises control of discharge metal-oxide-semiconductor Q1 and charging control metal-oxide-semiconductor Q2.In the time there is the situation of discharge over-current or overdischarge, the grid level of control of discharge metal-oxide-semiconductor Q1 is because the level of discharge end DIS changes the high level that jumps to feeder ear VDD from the low level of earth terminal VSS, and control of discharge metal-oxide-semiconductor Q1 cut-off, stops electric discharge.In the time there is charging over-voltage condition, the grid level that metal-oxide-semiconductor Q2 is controlled in charging jumps to high impedance R1 from the low level of earth terminal VSS, and metal-oxide-semiconductor Q2 cut-off is controlled in charging, stops charging.
Official standard application circuit based on S-8254 series and the lithium ionic battery protection circuit that designs needs charger to activate and just can resume work under overdischarge or overcurrent protection state.But in actual use, especially in field of power tools, lithium battery is often in limit use state frequently.As when using electric tool locking nut or taking off nut, motor is in stall state suddenly frequently, lithium battery can be because the effect of protective circuit, and closes output.Obviously the official standard circuit official standard circuit of S-8254 series can not meet electric tool continuous operation, uses the actual demand of state in the frequent limit.
For this reason on the basis of preferred circuit; need to design a kind of additional automatic restoring circuit of lithium battery protection circuit; do not affecting under the prerequisite of original defencive function; can automatically from overdischarge or overcurrent protection state, return to normal condition; reduce manual operation; to meet electric tool continuous operation, use the actual demand of state in the frequent limit, improve the service efficiency of electric tool.
Summary of the invention
Technical problem to be solved in the utility model is: the additional automatic recovery device that a kind of lithium battery protection circuit is provided; do not affecting under original prerequisite based on S-8254 defencive function; can automatically from overdischarge or overcurrent protection state, return to normal condition; reduce manual operation; to meet electric tool continuous operation; use the actual demand of state in the frequent limit, improve the service efficiency of electric tool.
The utility model solves the problems of the technologies described above taked technical scheme: a kind of additional automatic recovery device of lithium battery protection circuit, for electric tool, lithium battery group protective circuit based on S-8254, be connected with motor M1 by electric tool switch K1, at least comprise a PNP transistor Q3, N-type metal-oxide-semiconductor Q4 and resistance R 5, wherein, the emitting stage of described PNP transistor Q3 is connected with battery battery core anode B+, the collector electrode of PNP transistor Q3 is connected with battery anode P+ through resistance R 5, the base stage of described PNP transistor Q3 is connected with the drain electrode of N-type metal-oxide-semiconductor Q4, the source electrode of described N-type metal-oxide-semiconductor Q4 is connected with the earth terminal VSS of the lithium battery group protective circuit based on S-8254, the grid of this N-type metal-oxide-semiconductor Q4 is connected with its discharge end DIS, and in parallel with battery negative terminal P-.
Principle is: when after operating electric tool K switch 1 closure, lithium ion battery group is controlled metal-oxide-semiconductor Q2 by control of discharge metal-oxide-semiconductor Q1 and charging and provided power to motor M1.After motor M1 stall, control of discharge metal-oxide-semiconductor Q1 and charging are controlled metal-oxide-semiconductor Q2 and are turn-offed, and the lithium battery group protective circuit based on S-8254 enters overcurrent protection pattern.Under overcurrent protection pattern; discharge end DIS network level equals feeder ear VDD level; when the grid level of described N-type metal-oxide-semiconductor Q4 jumps to the high level of feeder ear VDD because the level of discharge end DIS changes from the low level of earth terminal VSS; N-type metal-oxide-semiconductor Q4 conducting; and then make PNP transistor Q3 conducting; after PNP transistor Q3 conducting, battery battery core anode B+ and battery anode P+ couple together by resistance R 5.
On such scheme basis, conducting and disconnection between the described positive and negative end of electric tool switch control battery and motor.
The utility model has the advantage of; only need to disconnect electric tool switch; can be from overcurrent protection recovering state to normal condition; do not affecting under the prerequisite of original defencive function; greatly reduce manual operation; meet electric tool continuous operation, used the actual demand of state in the frequent limit, improved the service efficiency of electric tool.
Accompanying drawing explanation
Fig. 1 is S-8254 series standard application circuit;
Fig. 2 is the utility model circuit theory diagrams;
Fig. 3 is the connection layout of three string lithium ion battery protecting plates, lithium ion battery and motor, and wherein, K1 is the console switch of electric tool, and M1 is DC motor, and PCM is three string lithium ion battery protecting plates, Cell n(n=1,2,3) be lithium ion battery;
Attached number in the figure explanation
P+---battery anode; P----battery negative terminal;
B+---battery battery core anode B----battery battery core negative terminal;
VDD---feeder ear; VSS---earth terminal;
UI---S-8254AAN chip; No. 2 pins of VMP---S-8254AAN chip
DIS---discharge end; K1---electric tool switch;
Q1---control of discharge metal-oxide-semiconductor; Q2---metal-oxide-semiconductor is controlled in charging;
Q3---PNP transistor; Q4---N-type metal-oxide-semiconductor;
R1---high-impedance resistors; R5---resistance;
M1---motor;
Cell1, Cell2, Cell3---lithium battery.
Embodiment
Referring to Fig. 2 is the utility model circuit diagram, and Fig. 3 is the connection layout of three string lithium ion battery protecting plates, lithium ion battery and motor:
A kind of additional automatic recovery device of lithium battery protection circuit, for electric tool, lithium battery group protective circuit based on S-8254, be connected with motor M1 by electric tool switch K1, comprise a PNP transistor Q3, N-type metal-oxide-semiconductor Q4 and resistance R 5, as shown in Figure 2, the emitting stage of described PNP transistor Q3 is connected with battery battery core anode B+, the collector electrode of PNP transistor Q3 is connected with battery anode P+ through resistance R 5, the base stage of described PNP transistor Q3 is connected with the drain electrode of N-type metal-oxide-semiconductor Q4, the source electrode of N-type metal-oxide-semiconductor Q4 is connected with the earth terminal VSS of the lithium battery group protective circuit (as shown in Figure 1) based on S-8254, the grid of N-type metal-oxide-semiconductor Q4 is connected with its discharge end DIS, and in parallel with battery negative terminal P-, when the grid level of described N-type metal-oxide-semiconductor Q4 jumps to the high level of feeder ear VDD because the level of discharge end DIS changes from the low level of earth terminal VSS, N-type metal-oxide-semiconductor Q4 conducting, and then make PNP transistor Q3 conducting, after PNP transistor Q3 conducting, battery battery core anode B+ and battery anode P+ couple together by resistance R 5.
Lithium battery group protective circuit based on S-8254 as shown in Figure 1; in the time there is discharge over-current and low voltage condition; the grid level of control of discharge metal-oxide-semiconductor Q1 is because the level of discharge end DIS changes the high level that jumps to feeder ear VDD from the low level of earth terminal VSS; control of discharge metal-oxide-semiconductor Q1 cut-off, stops electric discharge.In the time there is charging over-voltage condition, the grid level that metal-oxide-semiconductor Q2 is controlled in charging jumps to high impedance R1 from the low level of earth terminal VSS, and metal-oxide-semiconductor Q2 cut-off is controlled in charging, stops charging.
On such scheme basis, as shown in Figure 3, described electric tool switch K1 controls conducting and the disconnection between the positive and negative end P+ of battery, P-and motor M1.When after electric tool switch K1 closure, lithium battery Cell1, Cell2, Cell3 provide power by control of discharge metal-oxide-semiconductor Q1 and charging control metal-oxide-semiconductor Q2 to motor M1.After motor M1 stall, testing circuit Sense detects circuit generation overcurrent phenomenon, and the level of discharge end DIS jumps to the high level of feeder ear VDD from the low level of earth terminal VSS.The grid level of control of discharge metal-oxide-semiconductor Q1 is because the level of discharge end DIS changes the high level that jumps to feeder ear VDD from the low level of earth terminal VSS, and control of discharge metal-oxide-semiconductor Q1 cut-off, stops electric discharge, and protective circuit enters overcurrent protection pattern.Meanwhile, the grid level of N-type metal-oxide-semiconductor Q4 is because the level of discharge end DIS changes the high level that jumps to feeder ear VDD from the low level of earth terminal VSS, N-type metal-oxide-semiconductor Q4 conducting, and then make PNP transistor Q3 conducting.After PNP transistor Q3 conducting, battery battery core anode B+ and battery anode P+ couple together by resistance R 5.
Now, if electric tool switch K1 disconnects, battery anode P+ is connected to battery battery core anode B+ by resistance R 5, the electromotive force VP+ of battery anode P+ is: VP+=RL/{(REC+R5) ∥ (RVMD+R3)+RL}*VDD, wherein, RL is the resistance between battery anode P+ and battery negative terminal P-, because electric tool switch K1 disconnects, RL is very big, impedance when REC is the conducting of PNP transistor Q3, resistance when RVMD is the high level that is pulled to feeder ear VDD of No. 2 pins of S-8254AAN chip UI, now RVMD equals 1M ohm, the level of feeder ear VDD equals the level of power supply battery core anode B+.Because RL, much larger than (REC+R5) ∥ (RVMD+R3), so the electromotive force VP+ of battery anode P+ approximates the level of feeder ear VDD, is equal to and is connected to charger.Therefore, overcurrent protection mode release.The level of discharge end DIS returns to the low level of earth terminal VSS, during N-type metal-oxide-semiconductor Q4 and PNP transistor Q3, ends, and the utility model automatic restoring circuit is not worked.
If K1 continues closed, motor M1 continues stall, and the resistance R L between battery anode P+ and battery negative terminal P-equals the DC impedance RMD of motor M1 coil.The electromotive force VP+ that therefore can calculate battery anode P+ is: VP+=RMD/ (REC+R5) * VDD.Impedance when REC is the conducting of PNP transistor Q3, because RMD is much smaller than REC+R5, so VP+ is much smaller than the high level of feeder ear VDD.Overcurrent protection pattern continues to maintain.
In the utility model, because discharge over-current while making the process of control of discharge metal-oxide-semiconductor Q1 cut-off, when control of discharge metal-oxide-semiconductor Q1 grid level jumps to VDD from VSS, makes N-type metal-oxide-semiconductor Q4 conducting, PNP transistor Q3 follows conducting.B+ level is guided to P+ by resistance R 5.Now, closed if electric tool switch K1 continues, the DC impedance of motor M1 has become the load internal resistance of lithium ion battery so.Battery anode P+ level is close to earth terminal VSS.Control of discharge metal-oxide-semiconductor Q1 continues remain off, N-type metal-oxide-semiconductor Q4, and PNP transistor Q3 continues to keep conducting.If electric tool switch K1 flicks, motor M1 is not connected to baffle PCM.Battery battery core anode B+ is connected to battery anode P+ by resistance R 5, is equal to connecting charger.Therefore activate baffle, recover the conducting of control of discharge metal-oxide-semiconductor Q1, N-type metal-oxide-semiconductor Q4 and PNP transistor Q3 end in succession.
Claims (2)
1. the additional automatic recovery device of a lithium battery protection circuit, for electric tool, lithium battery group protective circuit based on S-8254, be connected with motor (M1) by electric tool switch (K1), it is characterized in that: comprise a PNP transistor (Q3), N-type metal-oxide-semiconductor (Q4) and resistance (R5), wherein, the emitting stage of described PNP transistor (Q3) is connected with battery battery core anode (B+), the collector electrode of PNP transistor (Q3) is connected with battery anode (P+) through resistance (R5), the base stage of described PNP transistor (Q3) is connected with the drain electrode of N-type metal-oxide-semiconductor (Q4), the source electrode of N-type metal-oxide-semiconductor (Q4) is connected with the earth terminal (VSS) of the lithium battery group protective circuit based on S-8254, the grid of N-type metal-oxide-semiconductor (Q4) is connected with discharge end (DIS), and in parallel with battery negative terminal (P-), when the grid level of described N-type metal-oxide-semiconductor (Q4) jumps to the high level of feeder ear (VDD) because the level of discharge end (DIS) changes from the low level of earth terminal (VSS), N-type metal-oxide-semiconductor (Q4) conducting, and then make PNP transistor (Q3) conducting, after PNP transistor (Q3) conducting, battery battery core anode (B+) and battery anode (P+) couple together by resistance (R5).
2. the additional automatic recovery device of a kind of lithium battery protection circuit according to claim 1, is characterized in that: described electric tool switch (K1) is controlled conducting and the disconnection between the positive and negative end of battery (P+, P-) and motor (M1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420012882.9U CN203660517U (en) | 2014-01-09 | 2014-01-09 | Additional automatic recovery device of lithium battery protection circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420012882.9U CN203660517U (en) | 2014-01-09 | 2014-01-09 | Additional automatic recovery device of lithium battery protection circuit |
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| Publication Number | Publication Date |
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| CN203660517U true CN203660517U (en) | 2014-06-18 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201420012882.9U Expired - Lifetime CN203660517U (en) | 2014-01-09 | 2014-01-09 | Additional automatic recovery device of lithium battery protection circuit |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107039951A (en) * | 2017-03-17 | 2017-08-11 | 南京中感微电子有限公司 | Battery protecting circuit and lithium battery |
| CN111817376A (en) * | 2020-07-07 | 2020-10-23 | 上海钧正网络科技有限公司 | Automatic discharging circuit, method and device for lithium battery |
-
2014
- 2014-01-09 CN CN201420012882.9U patent/CN203660517U/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107039951A (en) * | 2017-03-17 | 2017-08-11 | 南京中感微电子有限公司 | Battery protecting circuit and lithium battery |
| CN107039951B (en) * | 2017-03-17 | 2019-04-16 | 南京中感微电子有限公司 | Battery protecting circuit and lithium battery |
| CN111817376A (en) * | 2020-07-07 | 2020-10-23 | 上海钧正网络科技有限公司 | Automatic discharging circuit, method and device for lithium battery |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CP03 | Change of name, title or address |
Address after: 200083 806, floor 8, No. 125, Liuying Road, Hongkou District, Shanghai Patentee after: Shanghai Wei'an Electronic Co.,Ltd. Address before: Seven road 201202 Shanghai Pudong New Area Shiwan No. 1001 Patentee before: Shanghai Changyuan Wayon Circuit Protection Co.,Ltd. |
|
| CP03 | Change of name, title or address | ||
| CP03 | Change of name, title or address |
Address after: Room 806, 8th floor, 125 Liuying Road, Hongkou District, Shanghai 200083 Patentee after: Shanghai Weian Electronics Co.,Ltd. Address before: 806, 8th floor, 125 Liuying Road, Hongkou District, Shanghai 200083 Patentee before: Shanghai Wei'an Electronic Co.,Ltd. |
|
| CP03 | Change of name, title or address | ||
| CX01 | Expiry of patent term |
Granted publication date: 20140618 |
|
| CX01 | Expiry of patent term |