CN208939565U - A kind of lithium battery tandem type dual-protection circuit - Google Patents
A kind of lithium battery tandem type dual-protection circuit Download PDFInfo
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- CN208939565U CN208939565U CN201821901769.0U CN201821901769U CN208939565U CN 208939565 U CN208939565 U CN 208939565U CN 201821901769 U CN201821901769 U CN 201821901769U CN 208939565 U CN208939565 U CN 208939565U
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Abstract
The utility model discloses a kind of lithium battery tandem type dual-protection circuits, including chip U1, chip U2, resistance R1, resistance R2, resistance R3, resistance R4, resistance R5, capacitor C1, capacitor C2, metal-oxide-semiconductor Q1A, metal-oxide-semiconductor Q1B, metal-oxide-semiconductor Q2A and metal-oxide-semiconductor Q2B, the utility model increases by one on original circuit and protects again, when first class of protection failure is in short circuit, another recast is stand-by protection breaking circuit, prevent short-circuit risks, in the starting of chip U1 regional level defencive function, pass through resistance R5 continued flow resistance, it can ensure that chip U2 region safe secondary protection circuit works normally, it can be after releasing extremely, charge normal activation, reduce battery protection disabler risk, ensure that equipment safety works normally.
Description
Technical field:
The utility model relates to technical field of lithium batteries more particularly to a kind of lithium battery tandem type dual-protection circuits.
Background technique:
Major part protection board is single area's protection at present, extensive in conventional consumer class products application.But single area defencive function
It may fail, cause lithium battery to overcharge, over-discharge, overcurrent or short-circuit abnormal, may cause serious safety risk.
Existing li-ion cell protection battery is mostly substance protection, short circuit protection exception easily occurs, circuit is caused to exist
It powers under failure unprotect state, there is the risk of short circuit damage battery at any time.
Utility model content:
In view of the above-mentioned problems, the technical problem to be solved by the present invention is to provide a kind of lithium battery tandem type duplicate protections
Circuit, including chip U1, chip U2, resistance R1, resistance R2, resistance R3, resistance R4, resistance R5, capacitor C1, capacitor C2, metal-oxide-semiconductor
One end of the connection of 5 feet the resistance R1 and capacitor C1 of Q1A, metal-oxide-semiconductor Q1B, metal-oxide-semiconductor Q2A and metal-oxide-semiconductor Q2B, the chip U1, it is described
The resistance R1 other end connects the 6 feet connection battery core cathode B- of battery core anode B+ and output cathode P+, the chip U1, resistance R5
One end, metal-oxide-semiconductor Q1A S foot, chip U1 1 foot connection metal-oxide-semiconductor Q1A G foot, chip U1 3 feet connection metal-oxide-semiconductor Q1B G foot,
The D foot of the metal-oxide-semiconductor Q1A and metal-oxide-semiconductor Q1B is to even, and 2 feet of the chip U1 connect one end of resistance R3, the resistance R3's
The other end connects the S of the S foot of metal-oxide-semiconductor Q1B, the other end of resistance R5, one end of capacitor C2,6 feet of chip U2 and metal-oxide-semiconductor Q2A
Foot；One end of the connection of 5 feet the resistance R2 and capacitor C2 of the chip U2, the G foot of the 1 foot connection metal-oxide-semiconductor Q2A of chip U2, chip
To even, 2 feet of the chip U2 connect the D foot of the G foot of the 3 feet connection metal-oxide-semiconductor Q2B of U2, the metal-oxide-semiconductor Q2A and metal-oxide-semiconductor Q2B
The other end of one end of resistance R4, the resistance R4 connects the S foot of metal-oxide-semiconductor Q2B, one end of thermistor TH1, output negative pole
The other end of P-, the thermistor TH1 connect external TH and detect foot.
Preferably, the thermistor TH1 is negative tempperature coefficient thermistor.
The utility model increases on original circuit the utility model has the advantages that the utility model is set as tandem type dual-protection circuit
One is added to protect again, any one heavy shielding failure, output can normal switching-off.Start in chip U1 regional level defencive function
When, pass through resistance R5 continued flow resistance, it can be ensured that chip U2 region safe secondary protection circuit works normally, can be after releasing extremely, just
Often charging activation.The double protection circuit of the utility model, double function is identical, and one when failing again wherein, and another Beijing South Maxpower Technology Co. Ltd rises
It is acted on to security control, can effectively reduce security risk, and after continued flow resistance is added, it can be ensured that started in protection act
When, it is not in reduce battery protection disabler risk the phenomenon that can not working, it is ensured that equipment safety works normally.
Detailed description of the invention:
The present invention is described in detail by the following detailed description and drawings for ease of explanation,.
Fig. 1 is the circuit diagram of the utility model.
Specific embodiment:
To make the objectives, technical solutions and advantages of the present invention clearer, below by shown in the accompanying drawings
Specific embodiment describes the utility model.However, it should be understood that these descriptions are merely illustrative, and it is not intended to limit this reality
With novel range.In addition, in the following description, descriptions of well-known structures and technologies are omitted, to avoid unnecessarily mixing
Confuse the concept of the utility model.
As shown in Figure 1, a kind of lithium battery tandem type dual-protection circuit of the utility model, including chip U1, chip U2,
Resistance R1, resistance R2, resistance R3, resistance R4, resistance R5, capacitor C1, capacitor C2, metal-oxide-semiconductor Q1A, metal-oxide-semiconductor Q1B, metal-oxide-semiconductor Q2A and
One end of the connection of 5 feet the resistance R1 and capacitor C1 of metal-oxide-semiconductor Q2B, the chip U1, the resistance R1 other end connection battery core anode
6 feet of B+ and output cathode P+, the chip U1 connect the S foot of battery core cathode B-, one end of resistance R5, metal-oxide-semiconductor Q1A, chip
The G foot of the 1 foot connection metal-oxide-semiconductor Q1A of U1, the G foot of the 3 feet connection metal-oxide-semiconductor Q1B of chip U1, the metal-oxide-semiconductor Q1A and metal-oxide-semiconductor Q1B
D foot to even, one end of 2 feet of chip U1 connection resistance R3, the S of the other end connection metal-oxide-semiconductor Q1B of the resistance R3
Foot, the other end of resistance R5, one end of capacitor C2,6 feet of chip U2 and metal-oxide-semiconductor Q2A S foot；5 feet of the chip U2 connect
One end of resistance R2 and capacitor C2, the G foot of the 1 foot connection metal-oxide-semiconductor Q2A of chip U2, the G of the 3 feet connection metal-oxide-semiconductor Q2B of chip U2
For the D foot of foot, the metal-oxide-semiconductor Q2A and metal-oxide-semiconductor Q2B to even, 2 feet of the chip U2 connect one end of resistance R4, the resistance R4
The other end connect the S foot of metal-oxide-semiconductor Q2B, one end of thermistor TH1, output negative pole P-, the thermistor TH1's is another
End connects external TH and detects foot.
Specifically, thermistor TH1 is negative tempperature coefficient thermistor.
Specifically, defencive function illustrates, by taking protection zone on the left of circuit as an example:
Q1 is power MOS, and function is switching current access；
U1 be protection chip, provide overcharge, Cross prevention voltage, overcharge, Cross prevention electric current, short circuit current protection；
R1 protects chip power current-limiting resistance；
C1 is protection chip power foot shunt capacitance, filtering interference signals；
R3 be overcharge, over-discharge, short circuit current detection foot current-limiting resistance；
R5 provides afterflow function for rear terminal protecting circuit, in Q1 shutdown, remains to electricity needed for terminal protecting circuit after providing
Stream, is not working；
Right side protection zone function is other same in addition to R5 is not necessarily to.
Specifically, such as Fig. 1, circuit is protected to be divided into 2 parts:
1, on the left of circuit protection zone provide overcharge, over-discharge voltage protection, overcharge, over-discharge current protection, short-circuit protection, and right
Protect circuit afterflow function in side；
Protection voltage: 4.28 ± 0.05V (1S) is overcharged, overcharges and restores 4.08 ± 0.05V of voltage；
Cross prevention voltage: 3.0 ± 0.1V (128mS), over-discharge restore 3.0 ± 0.1V of voltage；
Overcharge protective current: 2.8A~3.3A (8mS)；
Cross prevention electric current: 2.3A~3.1A (8mS)；
Short circuit current protection: 13~18A (280uS)；
Right side is provided and protects circuit afterflow 30uA operating current.
2, on the right side of circuit protection zone provide overcharge, over-discharge voltage protection, overcharge, over-discharge current protection, short-circuit protection function；
Protection voltage: 4.28 ± 0.05V (1S) is overcharged, overcharges and restores 4.08 ± 0.05V of voltage；
Cross prevention voltage: 3.0 ± 0.1V (128mS), over-discharge restore 3.0 ± 0.1V of voltage；
Overcharge protective current: 2.8A~3.3A (8mS)；
Cross prevention electric current: 2.3A~3.1A (8mS)；
Short circuit current protection: 13~18A (280uS).
The utility model increases by one on original circuit and protects again, when first class of protection failure is in short circuit, another recast
For stand-by protection breaking circuit, prevent short-circuit risks；In the starting of chip U1 regional level defencive function, pass through resistance R5 afterflow
Resistance, it can be ensured that chip U2 region safe secondary protection circuit works normally, and can charge normal activation after releasing extremely, reduce electricity
Pond defencive function failure risk, it is ensured that equipment safety works normally.
The basic principles and main features of the present invention and the advantages of the present invention have been shown and described above.Current row
The technical staff of industry is described in above embodiments and description it should be appreciated that the present utility model is not limited to the above embodiments
Only illustrate the principles of the present invention, on the premise of not departing from the spirit and scope of the utility model, the utility model is also
It will have various changes and improvements, these various changes and improvements fall within the scope of the claimed invention.The utility model
Claimed range is defined by the appending claims and its equivalent thereof.
Claims (2)
1. a kind of lithium battery tandem type dual-protection circuit, which is characterized in that including chip U1, chip U2, resistance R1, resistance
R2, resistance R3, resistance R4, resistance R5, capacitor C1, capacitor C2, metal-oxide-semiconductor Q1A, metal-oxide-semiconductor Q1B, metal-oxide-semiconductor Q2A and metal-oxide-semiconductor Q2B, institute
One end of the connection of 5 feet the resistance R1 and capacitor C1 of chip U1 are stated, the resistance R1 other end connection battery core anode B+ and output are just
6 feet of pole P+, the chip U1 connect the S foot of battery core cathode B-, one end of resistance R5, metal-oxide-semiconductor Q1A, the 1 foot connection of chip U1
The D foot of the G foot of metal-oxide-semiconductor Q1A, the G foot of the 3 feet connection metal-oxide-semiconductor Q1B of chip U1, the metal-oxide-semiconductor Q1A and metal-oxide-semiconductor Q1B are to company, institute
State one end of the 2 feet connection resistance R3 of chip U1, the other end connection S foot of metal-oxide-semiconductor Q1B of the resistance R3, resistance R5 it is another
One end, one end of capacitor C2,6 feet of chip U2 and metal-oxide-semiconductor Q2A S foot；The 5 feet connection resistance R2 and capacitor of the chip U2
One end of C2, the G foot of the 1 foot connection metal-oxide-semiconductor Q2A of chip U2, the G foot of the 3 feet connection metal-oxide-semiconductor Q2B of chip U2, the metal-oxide-semiconductor
To even, one end of the 2 feet connection resistance R4 of the chip U2, the other end of the resistance R4 connects the D foot of Q2A and metal-oxide-semiconductor Q2B
The S foot of metal-oxide-semiconductor Q2B, one end of thermistor TH1, output negative pole P-, the thermistor TH1 the other end connect external TH
Detect foot.
2. a kind of lithium battery tandem type dual-protection circuit according to claim 1, it is characterised in that: the thermistor
TH1 is negative tempperature coefficient thermistor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821901769.0U CN208939565U (en) | 2018-11-19 | 2018-11-19 | A kind of lithium battery tandem type dual-protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821901769.0U CN208939565U (en) | 2018-11-19 | 2018-11-19 | A kind of lithium battery tandem type dual-protection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208939565U true CN208939565U (en) | 2019-06-04 |
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ID=66727755
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201821901769.0U Expired - Fee Related CN208939565U (en) | 2018-11-19 | 2018-11-19 | A kind of lithium battery tandem type dual-protection circuit |
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| CN (1) | CN208939565U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111313507A (en) * | 2020-03-31 | 2020-06-19 | 东莞新能德科技有限公司 | Battery protection circuit, battery and electronic device |
| CN114243630A (en) * | 2021-11-07 | 2022-03-25 | 中煤科工集团上海有限公司 | Safety control circuit of output power supply |
-
2018
- 2018-11-19 CN CN201821901769.0U patent/CN208939565U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111313507A (en) * | 2020-03-31 | 2020-06-19 | 东莞新能德科技有限公司 | Battery protection circuit, battery and electronic device |
| CN114243630A (en) * | 2021-11-07 | 2022-03-25 | 中煤科工集团上海有限公司 | Safety control circuit of output power supply |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| 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: 20190604 Termination date: 20191119 |