CN204334057U - A kind of Combined lithium battery - Google Patents
A kind of Combined lithium battery Download PDFInfo
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- CN204334057U CN204334057U CN201520007111.5U CN201520007111U CN204334057U CN 204334057 U CN204334057 U CN 204334057U CN 201520007111 U CN201520007111 U CN 201520007111U CN 204334057 U CN204334057 U CN 204334057U
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Abstract
A kind of Combined lithium battery, the charge protection integrated circuit comprising battery pack and be connected electrically, charge protection integrated circuit is provided with the chip U1 that model is UCC3957, the pin VDD of chip U1 is connected to P channel MOSFET transistors Q1 and P channel MOSFET transistors Q2, a diode is respectively connect between the drain electrode of these two P channel MOSFET transistors and source electrode, two diode directions are contrary, current sense resistor R2 is connected between pin AN4 and the BATLO of described chip U1, pin CDLY1 and CDLY2 connects respectively the electric capacity of a ground connection, the cold end of battery pack is connected to the pin AN4 of chip U1, hot end is connected on pin VDD, the tie point of every two batteries is linked in sequence pin AN1, AN2, on AN3.Charge protection integrated circuit of the present utility model can carry out two class protection to batteries arbitrary in battery pack; both can provide short circuit and respond fast; battery pack can be made again to bear certain surge current, prevent because filter capacitor is comparatively large and cause unnecessary overcurrent error protection action.
Description
Technical field
The utility model relates to field of lithium ion battery, relates in particular to a kind of Combined lithium battery.
Background technology
In recent years, the continuous deterioration of environment and oil, consuming excessively of the non-renewable energy resources such as coal, low-carbon environment-friendly and low-carbon economy are all appealed in the whole world, therefore the development accelerating rechargeable lithium ion batteries is inexorable trend, also full of vitality like the mushrooms after rain for the research of lithium ion battery both at home and abroad, this is because lithium ion battery has very large advantage relative to nickel-cadmium cell, as energy density is high, reliability is strong, high cyclical stability, memory-less effect, volume is little, lightweight, non-environmental-pollution etc., therefore the green energy resource of 21 century and the leading energy is called as.But the lithium battery power output of monomer is limited, so power battery pack is combined through series and parallel by the lithium battery of many monomers, but in its manufacture process, because the factors such as manufacturing process, battery material, internal resistance and environmental difference can cause occurring between battery pack internal resistance cell string exveral phenomena about voltage imbalance, when charging, the battery strings voltage of low-voltage is not also full of, high-tension battery strings has just reached the limit of charging, if do not had, Timeliness coverage is very possible to be damaged because of the overcharge of battery.If under discharge scenario, the battery that the quantity of electric charge is lower earlier can reach the deboost of electric discharge, because too low battery always first discharges, not only affects the overall amount of available capacitance of battery pack, and is easy to cause overdischarge and affect battery life.Existingly just to protect for battery pack entirety with the circuit of overdischarge for overcharging, and do not protect one by one, so overall normal use still can be had influence on when wherein a certain batteries overcharges or crosses and put.
Utility model content
The purpose of this utility model is, for the problems referred to above, providing a kind of can overcharge and over any batteries in battery pack, and the Combined lithium battery of protective circuit itself.
For achieving the above object, the utility model adopts following technical scheme:
A kind of Combined lithium battery, the charge protection integrated circuit comprising battery pack and be electrically connected with described battery pack, described charge protection integrated circuit is provided with the chip U1 that model is UCC3957, the pin VDD of described chip U1 is connected with P channel MOSFET transistors Q1 and P channel MOSFET transistors Q2, diode VD1 is connected with between the drain electrode of described P channel MOSFET transistors Q1 and source electrode, diode VD2 is connected with between the drain electrode of described P channel MOSFET transistors Q2 and source electrode, described diode VD1 is contrary with diode VD2 direction, current sense resistor R2 is also connected with between the pin AN4 of described chip U1 and pin BATLO, pin CDLY1 is connected with electric capacity C4, pin CDLY2 is connected with electric capacity C3, described electric capacity C3 and electric capacity C4 is ground connection respectively, the cold end of described battery pack is connected to the pin AN4 of described chip U1, hot end is connected on pin VDD, the tie point of every two batteries is linked in sequence pin AN1, AN2, on AN3.
Further, the resistance of described current sense resistor R2 is 0.25 Ω, and the value of described electric capacity C4 is 0.022 μ F, and the value of described electric capacity C3 is 22pF.
Further, described battery pack is the lithium battery of three joint series connection, and the pin CLCNT of described chip U1 links on pin DVDD, is linked together by pin AN3 and pin AN4 simultaneously.
Further, described battery pack is the lithium battery of four joint series connection, and the pin CLCNT ground connection of described chip U1, pin AN3 is connected to the positive pole of the bottom battery of described battery pack.
Further, also comprise resistance R1 and electric capacity C5, between the source electrode that described resistance R1 is connected to P channel MOSFET transistors Q1 and grid, described electric capacity C5 mono-end is connected to the hot end of described battery pack, in addition one end ground connection.
Further, resistance R1 is parallel with voltage stabilizing didoe VS1.
Further, the line of diode VD1 and diode VD2 is also in series with diode VD3, described diode VD3 ground connection.
Further, also comprise resistance R4 and resistance R5, described resistance R4 one end is connected to the centre of diode VD1 and diode VD2, one end is connected with the grid of P channel MOSFET transistors Q2 in addition, described resistance R5 one end is connected with the grid of described P channel MOSFET transistors Q2, and an other end is connected on the pin DCHG of described chip U1.
Implement the utility model and there is following beneficial effect:
1, the tie point of every two batteries is connected by the pin that respective sequence is corresponding with chip U1 successively, can protect single battery, charge protection integrated circuit realizes two-stage overcurrent protection to batteries charging with P channel MOSFET transistors Q1 together with P channel MOSFET transistors Q2, if when current sense resistor R2 detects that electric current reaches first order overcurrent threshold potential, circuit is with the guard time by user's setting, this guard time is determined by electric capacity C4, electric capacity C4 is discharged, if first order guard time arrives, battery pack overcharge or overdischarge fault is got rid of not yet, then second level protection is implemented in electric capacity C3 electric discharge, this secondary overcurrent protection both can provide short circuit and respond fast, battery pack can be made again to bear certain surge current, can prevent like this because filter capacitor is comparatively large and cause unnecessary overcurrent error protection action,
2, overcharging with in Cross prevention process, P channel MOSFET transistors Q1 carries out corresponding conducting and cut-off to diode VD1 and P channel MOSFET transistors Q1 and diode VD1, plays on-off action;
3, when resistance R1 and voltage stabilizing didoe VS1 is too high for charging voltage of opening a way when charger; P channel MOSFET transistors Q1 is protected; when short circuit; P channel MOSFET transistors Q2 ends; due to the distributed inductance that battery pack exports; at this moment can produce the negative sudden change of a voltage, therefore a diode VD3 is set P channel MOSFET transistors Q2 is protected, and it is stable to arrange electric capacity C5 maintenance.
Accompanying drawing explanation
Fig. 1 is the circuit diagram of this enforcement new embodiment 1;
Fig. 2 is the circuit diagram of this enforcement new embodiment 2.
Embodiment
Embodiment of the present utility model is described in detail below in conjunction with accompanying drawing.
A kind of Combined lithium battery, the charge protection integrated circuit comprising battery pack and be electrically connected with battery pack, charge protection integrated circuit is provided with chip U1, and the model of chip U1 is UCC3957.The cold end of battery pack is connected to the pin AN4 of chip U1; hot end is connected on pin VDD; the tie point of every two batteries is connected on pin AN1, AN2, AN3 by respective sequence accordingly, and such chip U1 just can protect a batteries any in battery pack.The voltage stability added on the battery pack for maintenance and uniformity, the hot end of battery pack is connected an electric capacity C5, electric capacity C5 other one end ground connection, the value of electric capacity C5 is 4.7 μ F.The pin VDD of chip U1 is connected with P channel MOSFET transistors Q1 and P channel MOSFET transistors Q2, P channel MOSFET transistors Q1 together with the diode VD1 connected between its drain electrode with source electrode as charging control switch, P channel MOSFET transistors Q2 be connected to it and drain as discharge control switch together with the diode VD2 between source electrode, diode VD1 is contrary with diode VD2 direction.Current sense resistor R2 is also connected with between the pin AN4 of chip U1 and pin BATLO, the resistance of current sense resistor R2 is 0.25 Ω, pin CDLY1 is connected with electric capacity C4, the value of electric capacity C4 is 0.022 μ F, pin CDLY2 is connected with electric capacity C3, and the value of electric capacity C3 is 22pF, wherein, electric capacity C3 and electric capacity C4 is ground connection respectively, and between the source electrode and grid of P channel MOSFET transistors Q1, be also connected with resistance R1, its resistance is 1M Ω.The pin AVDD of chip U1 connects electric capacity C2, and pin DVDD connects electric capacity C1, and the value of electric capacity C1 and electric capacity C2 is 0.1 μ F and ground connection.
As shown in Figure 1, in embodiment 1, battery pack is the lithium battery of three joint series connection, and the pin CLCNT of chip U1 links on pin DVDD, is linked together by pin AN3 and pin AN4 simultaneously.
As shown in Figure 2; in example 2; battery pack is the lithium battery of four joint series connection; the pin CLCNT ground connection of chip U1; pin AN3 is connected to the positive pole of the bottom battery of battery pack; resistance R1 is parallel with voltage stabilizing didoe VS1, both actings in conjunction are used for, when charger open circuit charging voltage is too high, protecting P channel MOSFET transistors Q1.The line of diode VD1 and diode VD2 is also in series with diode VD3, diode VD3 ground connection.When short circuit; P channel MOSFET transistors Q2 ends, and due to the distributed inductance that battery pack exports, at this moment can produce the negative sudden change of a voltage; therefore arrange a diode VD3 to protect P channel MOSFET transistors Q2, and it is stable to arrange electric capacity C5 maintenance.Resistance R4 and resistance R5 is also provided with in the present embodiment, resistance R4 one end is connected to the centre of diode VD1 and diode VD2, one end is connected with the grid of P channel MOSFET transistors Q2 in addition, resistance R5 one end is connected with the grid of P channel MOSFET transistors Q2, an other end is connected on the pin DCHG of chip U1, the resistance of resistance R4 is 1K Ω, and the resistance of resistance R5 is 100 Ω.Due to when discharge over-current is protected, the negative voltage that P channel MOSFET transistors Q2 produces is relevant with the size of overcurrent, therefore utilizes resistance R4, resistance R5 and between resistance R4 with resistance R5, be connected the size of current that an electric capacity C6 controls to pass through.
Particularly; if when current sense resistor R2 detects that electric current reaches first order overcurrent threshold potential; circuit is with the guard time by user's setting; this guard time is determined by electric capacity C4; electric capacity C4 is discharged; if first order guard time arrives; battery pack overcharge or overdischarge fault is got rid of not yet; electric capacity C3 electric discharge is then continued to implement second level protection; until failture evacuation; power consumption when this technology greatly reduces short circuit on P channel MOSFET transistors Q2, thus reduce the instructions for use to P channel MOSFET transistors Q2.
The utility model is not limited to above-mentioned embodiment; anyone can draw other various forms of products under enlightenment of the present utility model; above-mentioned embodiment is only schematic; instead of it is restrictive; those of ordinary skill in the art is under enlightenment of the present utility model; do not departing under the ambit that the utility model aim and claim protect, also can make a lot of form, these all belong within protection of the present utility model.
Claims (8)
1. a Combined lithium battery, the charge protection integrated circuit comprising battery pack and be electrically connected with described battery pack, it is characterized in that: described charge protection integrated circuit is provided with the chip U1 that model is UCC3957, the pin VDD of described chip U1 is connected with P channel MOSFET transistors Q1 and P channel MOSFET transistors Q2, diode VD1 is connected with between the drain electrode of described P channel MOSFET transistors Q1 and source electrode, diode VD2 is connected with between the drain electrode of described P channel MOSFET transistors Q2 and source electrode, described diode VD1 is contrary with diode VD2 direction, current sense resistor R2 is also connected with between the pin AN4 of described chip U1 and pin BATLO, pin CDLY1 is connected with electric capacity C4, pin CDLY2 is connected with electric capacity C3, described electric capacity C3 and electric capacity C4 is ground connection respectively, the cold end of described battery pack is connected to the pin AN4 of described chip U1, hot end is connected on pin VDD, the tie point of every two batteries is linked in sequence pin AN1, AN2, on AN3.
2. a kind of Combined lithium battery according to claim 1, is characterized in that: the resistance of described current sense resistor R2 is 0.25 Ω, and the value of described electric capacity C4 is 0.022 μ F, and the value of described electric capacity C3 is 22pF.
3. a kind of Combined lithium battery according to claim 1, is characterized in that: described battery pack is the lithium battery of three joint series connection, and the pin CLCNT of described chip U1 links on pin DVDD, is linked together by pin AN3 and pin AN4 simultaneously.
4. a kind of Combined lithium battery according to claim 1, is characterized in that: described battery pack is the lithium battery of four joint series connection, and the pin CLCNT ground connection of described chip U1, pin AN3 is connected to the positive pole of the bottom battery of described battery pack.
5. a kind of Combined lithium battery according to claim 3 or 4, it is characterized in that: also comprise resistance R1 and electric capacity C5, between the source electrode that described resistance R1 is connected to P channel MOSFET transistors Q1 and grid, described electric capacity C5 mono-end is connected to the hot end of described battery pack, in addition one end ground connection.
6. a kind of Combined lithium battery according to claim 4, is characterized in that: resistance R1 is parallel with voltage stabilizing didoe VS1.
7. a kind of Combined lithium battery according to claim 4, is characterized in that: the line of diode VD1 and diode VD2 is also in series with diode VD3, described diode VD3 ground connection.
8. a kind of Combined lithium battery according to claim 4, it is characterized in that: also comprise resistance R4 and resistance R5, described resistance R4 one end is connected to the centre of diode VD1 and diode VD2, one end is connected with the grid of P channel MOSFET transistors Q2 in addition, described resistance R5 one end is connected with the grid of described P channel MOSFET transistors Q2, and an other end is connected on the pin DCHG of described chip U1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520007111.5U CN204334057U (en) | 2015-01-07 | 2015-01-07 | A kind of Combined lithium battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520007111.5U CN204334057U (en) | 2015-01-07 | 2015-01-07 | A kind of Combined lithium battery |
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| Publication Number | Publication Date |
|---|---|
| CN204334057U true CN204334057U (en) | 2015-05-13 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520007111.5U Expired - Fee Related CN204334057U (en) | 2015-01-07 | 2015-01-07 | A kind of Combined lithium battery |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP3522328A1 (en) * | 2018-02-02 | 2019-08-07 | Samsung SDI Co., Ltd. | Battery protection circuit and battery pack having the same |
-
2015
- 2015-01-07 CN CN201520007111.5U patent/CN204334057U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP3522328A1 (en) * | 2018-02-02 | 2019-08-07 | Samsung SDI Co., Ltd. | Battery protection circuit and battery pack having the same |
| US10951046B2 (en) | 2018-02-02 | 2021-03-16 | Samsung Sdi Co., Ltd. | Battery and discharge FET protection circuit |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C41 | Transfer of patent application or patent right or utility model | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20160307 Address after: 518000 Guangdong province Shenzhen city Fuyong street Baoan District Funing first industrial zone of high-tech industrial park C Building 5 floor Patentee after: Shenzhen Hai Tong Tong Electronic Limited by Share Ltd Address before: 518000 building B2, building, Fumin Industrial Zone, Fu Shui street, Guangdong, Shenzhen, China Patentee before: Yan Huaijun |
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| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150513 Termination date: 20200107 |