CN207559550U

CN207559550U - A kind of lithium ion battery protecting plate circuit

Info

Publication number: CN207559550U
Application number: CN201721143705.4U
Authority: CN
Inventors: 何桂浩; 李桥甫; 房赫巍; 刘朝贤; 何岸
Original assignee: Huizhou Desay Battery Co Ltd
Current assignee: Huizhou Desay Battery Co Ltd
Priority date: 2017-09-07
Filing date: 2017-09-07
Publication date: 2018-06-29
Anticipated expiration: 2027-09-07

Abstract

The utility model is a kind of lithium ion battery protecting plate circuit; including battery, battery positive B+, battery negative terminal B, battery output plus terminal P+, battery output negative terminal P and protection board circuit; the protection board circuit includes first class of protection module, second class protection module and battery management module; the second class protection module includes IC1, fuse F1 and metal-oxide-semiconductor Q1; the first class of protection module includes IC3 and metal-oxide-semiconductor Q2; the feeder ear that the battery management module includes battery management IC2, the battery management IC2 is equipped with P metal-oxide-semiconductors reason module；The purpose of this utility model is to provide a kind of lithium ion battery protecting plate circuit; this lithium ion battery protecting plate circuit has innovated new battery protecting plate schematic diagram; it is improved on the basis of protection board battery management module; increase P metal-oxide-semiconductors reason module; and entire module; all using SMD components, battery can be not only protected, but also power consumption can be reduced.

Description

A kind of lithium ion battery protecting plate circuit

Technical field

The utility model is related to lithium ion batteries to protect field, especially a kind of lithium ion battery protecting plate circuit.

Background technology

With the frivolous fast development of consumer electronics product, more and more end products are put battery management IC by complete machine end To battery-end, this brings battery new challenge, and one of which is then that battery increases from power consumption multiplying power, and common batteries are from power consumption one As be less than 6uA, and charged pool management IC battery, then rise to 140uA from power consumption.It is from the definition of power consumption：Battery is in no band In the case of load, the electricity of autophage；Fig. 2 is the discharge characteristic curve figure of lithium battery, when cell voltage is in below 3.0V, It only accounts for total capacity about 5%, and too small capacity accounting undoubtedly aggravates what battery terminal voltage declined so big under power consumption Speed.

FOR ALL WE KNOW, lithium battery interior storage electric energy is realized by a kind of reversible electrochemical change, excessively Electric discharge this electrochemical change can be caused to generate irreversible reaction, lithium battery discharge cut-off voltage is generally in 2.3V at present, Once cell voltage is less than 2.3V, irreversible electrochemical reaction will occur, permanent damage is caused to battery or even is led It sends a telegraph pond to scrap, great security risk is brought to the use of battery.

Therefore, it is effectively prevented that cell voltage is too low to become particularly important；Current common practice is to load protection board, one As setting over voltage >=2.5V, before, due to low-down from power consumption, battery power down is very slow, so being put crossing Battery obtains few concern from power-down conditions in this period after electric protection；But since battery management IC is in battery The application at end so that battery is drastically increased from power consumption, in addition the uncontrollable occupation mode of consumer so that this case is closed Note.Therefore, battery declines the problem of too fast in voltage in the case that under-voltage protection has been turned on, also to be solved.

Utility model content

To solve the above-mentioned problems, the purpose of this utility model is to provide a kind of lithium ion battery protecting plate circuit, this lithium Ion battery protection board circuit has innovated new battery protecting plate schematic diagram, changes on the basis of protection board battery management module Into increasing P-MOS management modules, and entire module, all using SMD components, can not only protect battery, but also work(can be reduced Consumption.

The technical solution of the utility model is as follows：

A kind of lithium ion battery protecting plate circuit, including battery, battery positive B+, battery negative terminal B-, battery output plus terminal P +, battery output negative terminal P- and protection board circuit, the protection board circuit includes first class of protection module, second class protection module and electricity Pond management module, the second class protection module include IC1, fuse F1 and metal-oxide-semiconductor Q1, and the first class of protection module includes IC3 With metal-oxide-semiconductor Q2, the feeder ear that the battery management module includes battery management IC2, the battery management IC2 is managed equipped with P-MOS Manage module.

Preferably, the P-MOS management modules include P-MOS pipes Q3, and the S poles of the P-MOS pipes Q3 and the battery are just B+ connections are held, the G poles of the P-MOS pipes Q3 and the battery export negative terminal P- and connect, the D poles of the P-MOS pipes Q3 and described The feeder ear connection of battery management IC2.

Preferably, the P-MOS management modules further include pull-up resistor R4, the pull-up resistor R4 and are connected in parallel on the P- The S poles of metal-oxide-semiconductor Q3 and the G poles of the P-MOS pipes Q3.

Preferably, the P-MOS management modules further include protection capacitance C2, the protection capacitance C2 and are connected in parallel on the P- The S poles of metal-oxide-semiconductor Q3 and the D poles of the P-MOS pipes Q3.Protect the anti-interference and electrostatic energy for increasing P-MOS pipes Q3 of capacitance C2 Power.

Preferably, the P-MOS management modules also packet protective resistance R18, one end of the protective resistance R18 and the P- The G poles connection of metal-oxide-semiconductor Q3, the other end of the protective resistance R18 connect the battery output negative terminal P-.Protective resistance R18 rises To the G poles metering function to P-MOS pipes Q3.

Preferably, the fuse F1 is exported just respectively with the battery positive B+, the S poles of the metal-oxide-semiconductor Q1 and battery Hold the connection of P+.

Preferably, protective resistance R2 and protection capacitance are equipped between the battery positive B+ and the battery negative terminal B- both ends C1, the protective resistance R2 and the protection capacitance C1 are connected in series with.

Preferably, protection capacitance C13 and guarantor are equipped between the battery output plus terminal P+ and battery output negative terminal P- Capacitance C14 is protected, the protection capacitance C13 and protection capacitance C14 is connected in series with.

Preferably, the battery output negative terminal P- ground connection.

Preferably, the battery management IC2 is TI battery managements IC.It is defeated when first class of protection circuit starts protection act Go out signal and give metal-oxide-semiconductor Q1, open metal-oxide-semiconductor Q1 switches, circuit becomes open circuit, due to there is the presence of pull-up resistor R4, makes battery Anode B+ is equal with the G electrode potentials of P-MOS pipes Q3, i.e., the G pole tensions of P-MOS pipes Q3 are equal to the S pole tensions of P-MOS pipes Q3, VGS=0V, RDS are infinitely great, and the circuit for being equivalent to battery positive B+ to battery management IC2 disconnects, and make battery management IC2 due to lacking It powers less and enters close pattern, so as to make the battery from power consumption as common batteries, so effectively battery is avoided under-voltage The situation voltage having been started up is protected to decline the problem of too fast.

Using having the beneficial effect that for above technical scheme：

1. lithium ion battery protecting plate circuit has innovated new battery protecting plate schematic diagram, in protection board battery management It is improved on the basis of module, increases P-MOS management modules, and entire module, all using SMD components, can both protect electricity Pond, and power consumption can be reduced.

2. a lithium ion battery protecting plate circuit increases P-MOS management modules, make battery in under-voltage protection, cut-out electricity Pond manages IC2 power supplys, during so as to be effectively reduced battery under-voltage protection from power consumption, effect kept away cell voltage it is too low caused by peace The problem of full hidden danger.

3. a lithium ion battery protecting plate circuit has two class protection, in addition P-MOS management modules can calculate three-level guarantor Shield adequately ensures the safety of circuit.

Description of the drawings

Fig. 1 is the circuit diagram of the utility model lithium ion battery protecting plate circuit.

Fig. 2 is the discharge characteristic curve figure of lithium battery.

Specific embodiment

In order to facilitate the understanding of those skilled in the art, below in conjunction with attached drawing and embodiment to the utility model into traveling One step is described in detail.

Embodiment one

As shown in drawings, lithium ion battery protecting plate circuit, it is defeated including battery, battery positive B+, battery negative terminal B-, battery Go out anode P+, battery output negative terminal P- and protection board circuit, protection board circuit include first class of protection module, second class protection module and Battery management module, second class protection module include IC1, fuse F1 and metal-oxide-semiconductor Q1, and first class of protection module includes IC3 and metal-oxide-semiconductor Q2, battery management module include battery management IC2, and the feeder ear of battery management IC2 is equipped with P-MOS management modules.

Specifically, the S poles that P-MOS management modules include P-MOS pipes Q3, P-MOS pipe Q3 are connected with battery positive B+, P- The G poles of metal-oxide-semiconductor Q3 are connected with battery output negative terminal P-, and the D poles of P-MOS pipes Q3 are connected with the feeder ear of battery management IC2.

Specifically, P-MOS management modules further include pull-up resistor R4, pull-up resistor R4 be connected in parallel on P-MOS pipes Q3 S poles and The G poles of P-MOS pipes Q3.

Specifically, P-MOS management modules further include protection capacitance C2, protection capacitance C2 be connected in parallel on P-MOS pipes Q3 S poles and The D poles of P-MOS pipes Q3.

Specifically, one end of P-MOS management modules also packet protective resistance R18, protective resistance R18 and the G poles of P-MOS pipes Q3 Connection, the other end connection battery output negative terminal P- of protective resistance R18.

Specifically, the fuse F1 connections with battery positive B+, the S poles of metal-oxide-semiconductor Q1 and battery output plus terminal P+ respectively.

Specifically, protective resistance R2 and protection capacitance C1, protection are equipped between battery positive B+ and battery negative terminal B- both ends Resistance R2 and protection capacitance C1 are connected in series with.

Specifically, it is equipped with protection capacitance C13 and protection capacitance between battery output plus terminal P+ and battery output negative terminal P- C14, protection capacitance C13 and protection capacitance C14 are connected in series with.

Specifically, battery output negative terminal P- ground connection.

Specifically, battery management IC2 is TI battery managements IC.

The operation principle of this lithium ion battery protecting plate circuit：In the external P-MOS management mould of battery management IC2 feeder ears Block, the characteristic of P-MOS pipe components are：VGS voltages >=0V, RDS impedances are infinitely great；The S poles of P-MOS pipes Q3 are connected on electricity by we The G poles of pond anode B+, P-MOS pipes Q3 are connected on the D poles of battery output negative terminal P-, P-MOS pipe Q3 with battery management IC2 feeder ear phases Connection, pull-up resistor R4 and the G poles of P-MOS pipes Q3 and the S of P-MOS pipes Q3 are extremely in parallel.It is moved when first class of protection circuit starts protection When making, metal-oxide-semiconductor Q1 is outputed signal to, opens metal-oxide-semiconductor Q1 switches, circuit becomes open circuit, due to there is the presence of pull-up resistor R4, Make battery positive B+ equal with the G electrode potentials of P-MOS pipes Q3, i.e., the G pole tensions of P-MOS pipes Q3 are equal to the S of P-MOS pipes Q3 Pole tension, VGS=0V, RDS are infinitely great, and the circuit for being equivalent to battery positive B+ to battery management IC2 disconnects, and makes battery management IC2 Enter close pattern due to lacking power supply, so as to make the battery from power consumption as common batteries, so effectively avoid battery Decline the problem of too fast in the situation voltage that under-voltage protection has been started up.

Embodiment two

The battery management module of lithium ion battery protecting plate circuit in the present embodiment two is additionally provided with the first device of other protections Part, specifically as shown in circuit diagram, other component and connection mode are identical with embodiment one.

Following table is certain 3C Product battery project, without P-MOS management modules and with P-MOS management module batteries in voltage End is compared from the test data of power down（Same model battery core）：

Test method：5PCS batteries is respectively taken to be discharged to 3.0V with 0.2C, after standing 30 minutes, record initial voltage, then After room temperature 7 days, the voltage after standing is re-recorded.

It is numbered without P-MOS management module protection boards battery	Initial voltage V	Voltage V after standing 7 days	Voltage difference V
				1	3.076	2.403	0.673
2	3.083	2.455	0.628
				3	3.068	2.206	0.862
4	3.074	2.187	0.887
				5	3.081	2.324	0.757
MIN	3.068	2.187	0.881
				MAX	3.083	2.455	0.628

Band P-MOS management module protection boards battery number	Initial voltage V	Voltage V after standing 7 days	Voltage difference V
				6	3.082	3.048	0.034
7	3.074	3.039	0.035
				8	3.081	3.042	0.039
9	3.065	3.036	0.029
				10	3.077	3.038	0.039
MIN	3.065	3.036	0.029
				MAX	3.082	3.048	0.034

In terms of test data：After protection board loads P-MOS modules, effectively reduce battery and fall certainly in voltage end The speed of electricity.

It is the attached drawing combined in the utility model embodiment above, the technical scheme in the embodiment of the utility model is carried out It clearly and completely describes, it is clear that the described embodiments are only a part of the embodiments of the utility model rather than whole Embodiment.Based on the embodiment in the utility model, those of ordinary skill in the art are without making creative work All other embodiments obtained shall fall within the protection scope of the present invention.

Claims

1. a kind of lithium ion battery protecting plate circuit, including battery, battery positive B+, battery negative terminal B-, battery output plus terminal P+, Battery exports negative terminal P- and protection board circuit, which is characterized in that the protection board circuit includes first class of protection module, second class protection Module and battery management module, the second class protection module include IC1, fuse F1 and metal-oxide-semiconductor Q1, the first class of protection module Including IC3 and metal-oxide-semiconductor Q2, the battery management module includes battery management IC2, and the feeder ear of the battery management IC2 is equipped with P-MOS management modules.

2. lithium ion battery protecting plate circuit according to claim 1, which is characterized in that the P-MOS management modules packet P-MOS pipes Q3 is included, the S poles of the P-MOS pipes Q3 are connected with the battery positive B+, the G poles of the P-MOS pipes Q3 and the electricity Pond exports negative terminal P- connections, and the D poles of the P-MOS pipes Q3 are connected with the feeder ear of the battery management IC2.

3. lithium ion battery protecting plate circuit according to claim 2, which is characterized in that the P-MOS management modules are also Including pull-up resistor R4, the pull-up resistor R4 is connected in parallel on the S poles of the P-MOS pipes Q3 and the G poles of the P-MOS pipes Q3.

4. lithium ion battery protecting plate circuit according to claim 3, which is characterized in that the P-MOS management modules are also The S poles of the P-MOS pipes Q3 and the D poles of the P-MOS pipes Q3 are connected in parallel on including protection capacitance C2, the protection capacitance C2.

5. lithium ion battery protecting plate circuit according to claim 4, which is characterized in that the P-MOS management modules are also Packet protective resistance R18, one end of the protective resistance R18 are connected with the G poles of the P-MOS pipes Q3, the protective resistance R18's The other end connects the battery output negative terminal P-.

6. lithium ion battery protecting plate circuit according to claim 5, which is characterized in that the fuse F1 respectively with institute State the connection of battery positive B+, the S poles of the metal-oxide-semiconductor Q1 and battery output plus terminal P+.

7. lithium ion battery protecting plate circuit according to claim 6, which is characterized in that the battery positive B+ and described Protective resistance R2 and protection capacitance C1, the protective resistance R2 and the protection capacitance C1 strings are equipped between battery negative terminal B- both ends Connection connection.

8. lithium ion battery protecting plate circuit according to claim 7, which is characterized in that the battery output plus terminal P+ and Protection capacitance C13 and protection capacitance C14, the protection capacitance C13 and the protection are equipped between the battery output negative terminal P- Capacitance C14 is connected in series with.

9. lithium ion battery protecting plate circuit according to claim 8, which is characterized in that the battery output negative terminal P- connects Ground.

10. according to claim 1-9 any one of them lithium ion battery protecting plate circuits, which is characterized in that the cell tube Reason IC2 is TI battery managements IC.