CN207339340U - A kind of lithium electric protection plate of self-adapting charging voltage - Google Patents
A kind of lithium electric protection plate of self-adapting charging voltage Download PDFInfo
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- CN207339340U CN207339340U CN201721258756.1U CN201721258756U CN207339340U CN 207339340 U CN207339340 U CN 207339340U CN 201721258756 U CN201721258756 U CN 201721258756U CN 207339340 U CN207339340 U CN 207339340U
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Abstract
It the utility model is related to a kind of lithium electric protection plate of self-adapting charging voltage; a kind of lithium electric protection plate of self-adapting charging voltage; including fuse; program management MCU chip U2; discharge and recharge special chip U3; for the resistance of current detecting, discharge switch, charge switch and trickle charge circuit, the trickle charge circuit, which is used for the simulation constant pressure trickle charge in the lithium battery charging later stage, is full of electric quantity of lithium battery；A kind of charging method of lithium battery, when cell voltage reaches setting value, disconnects charge switch, into simulation trickle charge state, trickle-charge current is through PACK+, fuse, each batteries, resistance for current detecting, trickle charge circuit, PACK charge the battery, when detecting that cell voltage reaches full of magnitude of voltage, represent that battery is full of, turn off trickle charge circuit.The utility model is adapted to various charging voltages, and the phase automatic imitation constant pressure trickle charge after charging of this circuit is unrelated with charging voltage, it is also ensured that battery is full of.
Description
Technical field
It the utility model is related to lithium battery charging field, more particularly to a kind of lithium electric protection plate of self-adapting charging voltage.
Background technology
Lithium battery charge control mode：First constant current, in battery close to constant pressure, constant-voltage charge are a kind of low currents again when being full of
The mode of trickle charge, is the necessary condition that battery is full of, and when charger output voltage is too low, battery pack is filled less than required
Electrical voltage point, when charger output voltage is excessive, battery pack protection board can overvoltage protection, without constant voltage charging phase, the above
Two ways can all cause battery to be not fully filled, so height is required to the voltage accuracy of charger, generally all at mv grades.
Charging voltage precision controlling is always the most important thing of charger production process, it is necessary to put into vast resources to protect
Card, nonetheless, the first sport of this voltage accuracy problem or customer complaint.
The content of the invention
For the problems of the prior art, the utility model provides a kind of the lithium electric protection plate and lithium of self-adapting charging voltage
Method for charging batteries, as long as ensureing that charger output voltage can allow the lower limit that battery is full of, to the upper limit without strictly
To ask, be adapted to various charging voltages, the phase automatic imitation constant pressure trickle charge after charging of this circuit is unrelated with charging voltage,
It is also ensured that battery is full of.
To solve problem above, the solution of the utility model is a kind of lithium electric protection plate of self-adapting charging voltage,
Including fuse, program management MCU chip U2, discharge and recharge special chip U3, for the resistance of current detecting, discharge switch, fills
Electric switch and trickle charge circuit, the trickle charge circuit, which is used for the simulation constant pressure trickle charge in the lithium battery charging later stage, makes lithium
Battery capacity is full of, and the discharge and recharge special chip U3 is used to detect lithium battery voltage, electric current and temperature, and by voltage, electric current
With temperature data be sent to program management MCU chip U2, described program manage MCU chip U2 according to obtain voltage, electric current and
Temperature data charges, electric discharge, the various controls such as preliminary filling；
[PACK+] of lithium battery pack, [PACK-] are connecing charger just respectively, bear both ends, the discharge and recharge special chip U3
Each batteries of lithium battery pack are detected, when detecting each batteries of lithium battery pack in the range of lithium battery preset charge voltage
When, MCU controls close charge switch, and discharge switch is closure all the time in the charge state, and charging current passes through [PACK+],
Fuse, each batteries, charge the battery, fill for the resistance of current detecting, [discharge switch], [charge switch], [PACK-]
Discharge and recharge special chip U3 detects cell voltage in real time in electric process, and temperature, current data, presets more than lithium battery when data and fill
During piezoelectric voltage value, MCU provides instruction, disconnects charge switch.
As an improvement, the trickle charge circuit includes three resistance, and four triodes, a diode, described three
Resistance represents that four triodes Q25, Q26, Q14, Q15 are represented, one diode D2 with R21, R32, R57
To represent, the base stage B of the triode Q25 is connected with program management MCU chip U2, and the collector C and VDD of triode Q25 connect
Connect, the emitter E of triode Q25 is connected with the cathode of diode D2 and one end of resistance R21 respectively, and the diode D2's is negative
Pole is connected with one end of resistance R57 and the emitter E of triode Q14 respectively, the other end of resistance R57 respectively with triode Q14
Base stage B connected with the emitter E of triode Q15, the collector C of the triode Q14 base stage B and electricity with triode Q15 respectively
One end connection of R32 is hindered, the collector C of triode Q15 is connected with the emitter E of triode Q26, the collector C of triode Q26
It is connected with the other end of resistance R32, the base stage B of triode Q26 is connected with the other end of resistance R21；
When cell voltage reaches lithium battery preset charge voltage 0.01-0.03V/ and often saves, charge switch is disconnected, into simulation
Trickle charge state, at this time MCU give Q25 high potentials, open Q25, Q26, Q14, Q15, the R57, Q14, Q15, R32, Q26 groups
Into low current constant current circuit, trickle-charge current is through [PACK+], [fuse], each batteries, the electricity for current detecting at this time
Resistance, [Q15], [PACK-] charges the battery, when detecting that cell voltage often saves more than lithium battery preset charge voltage 0.04V/
When, represent that battery is full of, shut-off trickle charge control triode Q25.
As an improvement, the lithium battery preset charge voltage often saves for 2.5-4.15V/, more than lithium battery preset charged electricity
Pressure 0.01-0.03V, that is, lithium battery charging voltage often saves for 4.16-4.18V/.
As an improvement, when detecting that cell voltage is often saved more than lithium battery preset charge voltage 0.04V/, that is, detect
When 4.2V/ is often saved, battery is full of cell voltage.
As a further improvement, the charge switch is made of triode.
As a further improvement, the discharge switch is made of triode.
A kind of charging method of lithium battery, uses the lithium electric protection plate of above-mentioned self-adapting charging voltage, the charging
Method comprises the following steps：
Step 1: [PACK+] of lithium battery pack, [PACK-] are connecing charger just respectively, both ends are born, the discharge and recharge is special
With each batteries of chip U3 detection lithium battery packs, when detecting each batteries of lithium battery pack in the range of 2.5-4.15V
When, MCU controls close charge switch, and discharge switch is closure all the time in the charge state, and charging current passes through [PACK+],
Fuse, each batteries, charge the battery, fill for the resistance of current detecting, [discharge switch], [charge switch], [PACK-]
Discharge and recharge special chip U3 detects cell voltage in real time in electric process, temperature, current data, when data exceed setting value, MCU
Instruction is provided, disconnects charge switch.
Step 2: cell voltage reaches 4.16V/ when often saving, charge switch is disconnected, into simulation trickle charge state, this
When MCU control trickle charge line clear, at this time trickle-charge current pass through [PACK+], [fuse], each batteries, for electricity
The resistance of detection is flowed, trickle charge circuit, [PACK-] charges the battery, when detecting that cell voltage is often saved in 4.2V/, table
Show that battery is full of, turn off trickle charge circuit.
A kind of charging method of lithium battery, uses the lithium electric protection plate of above-mentioned self-adapting charging voltage, the charging
Method comprises the following steps：
Step 1: [PACK+] of lithium battery pack, [PACK-] are connecing charger just respectively, both ends are born, the discharge and recharge is special
With each batteries of chip U3 detection lithium battery packs, when detecting each batteries of lithium battery pack in the range of 2.5-4.15V
When, MCU controls close charge switch, and discharge switch is closure all the time in the charge state, and charging current passes through [PACK+],
Fuse, each batteries, charge the battery, fill for the resistance of current detecting, [discharge switch], [charge switch], [PACK-]
Discharge and recharge special chip U3 detects cell voltage in real time in electric process, temperature, current data, when data exceed setting value, MCU
Instruction is provided, disconnects charge switch.
Step 2: cell voltage reaches 4.16V/ when often saving, charge switch is disconnected, into simulation trickle charge state, this
When MCU give Q25 high potentials, open Q25, Q26, Q14, Q15, the R57, Q14, Q15, R32, Q26 composition low current constant-current contours
Road, at this time trickle-charge current pass through [PACK+], [fuse], each batteries, for the resistance of current detecting, [Q15],
[PACK-] charges the battery, and when detecting that cell voltage is often saved in 4.2V/, represents that battery is full of, shut-off trickle charge control
Triode Q25.
From the above, it can be seen that the utility model has the following advantages：
Lithium electricity charger high to output voltage precision is always a bottleneck for perplexing charger, and factory needs to put into a large amount of
Manpower, material resources.The fraction defective of charger can be greatly reduced in the utility model, reduce cost, improve efficiency, while also reduce
The charging risk of battery pack.
The utility model is a kind of lithium electric protection plate of self-adapting charging voltage, as long as ensureing that charging voltage can allow battery
The lower limit being full of, is not strict with the upper limit, is adapted to various charging voltages, this circuit phase automatic mold after charging
Intend constant pressure trickle charge, it is unrelated with charging voltage, it is also ensured that battery is full of.
Brief description of the drawings
Fig. 1 is the module diagram of the utility model；
Fig. 2 is the specific implementation circuit diagram of the utility model；
Fig. 3 is the utility model trickle charge line map；
Embodiment
With reference to Fig. 1, first specific embodiment of the utility model is described in detail, but the right of the utility model is not wanted
Ask and do any restriction.
As shown in Figure 1, a kind of lithium electric protection plate of self-adapting charging voltage, including fuse, program management MCU chip
U2, discharge and recharge special chip U3, for the resistance of current detecting, discharge switch, charge switch and trickle charge circuit, the tiny stream
Current charge circuit, which is used for the simulation constant pressure trickle charge in the lithium battery charging later stage, is full of electric quantity of lithium battery, and the discharge and recharge is special
Chip U3 is used to detect lithium battery voltage, electric current and temperature, and voltage, electric current and temperature data are sent to program management MCU
Chip U2, described program management MCU chip U2 charge according to obtained voltage, electric current and temperature data, discharge, preliminary filling etc.
Various controls；
[PACK+] of lithium battery pack, [PACK-] are connecing charger just respectively, bear both ends, the discharge and recharge special chip U3
Each batteries of lithium battery pack are detected, when detecting each batteries of lithium battery pack when in the range of 2.5-4.15V, MCU is controlled
Charge switch is closed, discharge switch is closure all the time in the charge state, and charging current passes through [PACK+], fuse, each section
Battery, charges the battery, is filled in charging process for the resistance of current detecting, [discharge switch], [charge switch], [PACK-]
Electric discharge special chip U3 detects cell voltage in real time, and temperature, current data, when data exceed setting value, MCU provides instruction,
Disconnect charge switch.
More specifically, the trickle charge circuit includes three resistance, and four triodes, a diode, described three
Resistance represents that four triodes Q25, Q26, Q14, Q15 are represented, one diode D2 with R21, R32, R57
To represent, the base stage B of the triode Q25 is connected with program management MCU chip U2, and the collector C and VDD of triode Q25 connect
Connect, the emitter E of triode Q25 is connected with the cathode of diode D2 and one end of resistance R21 respectively, and the diode D2's is negative
Pole is connected with one end of resistance R57 and the emitter E of triode Q14 respectively, the other end of resistance R57 respectively with triode Q14
Base stage B connected with the emitter E of triode Q15, the collector C of the triode Q14 base stage B and electricity with triode Q15 respectively
One end connection of R32 is hindered, the collector C of triode Q15 is connected with the emitter E of triode Q26, the collector C of triode Q26
It is connected with the other end of resistance R32, the base stage B of triode Q26 is connected with the other end of resistance R21；
When cell voltage reaches 4.16V/ and often saves, charge switch is disconnected, into simulation trickle charge state, MCU gives at this time
Q25 high potentials, open Q25, Q26, Q14, Q15, the R57, Q14, Q15, R32, Q26 composition low current constant current circuits, at this time
Trickle-charge current passes through [PACK+], [fuse], each batteries, and for the resistance of current detecting, [Q15], [PACK-] is to electricity
Pond is charged, and when detecting that cell voltage is often saved in 4.2V/, represents that battery is full of, shut-off trickle charge control triode Q25.
More specifically, the lithium battery preset charge voltage is 2.5-4.15V, more than lithium battery preset charge voltage
0.01-0.03V, that is, lithium battery charging voltage is 4.16-4.18V
More specifically, the fuse is represented with F1.
More specifically, the charge switch is made of triode, specifically it is made of Q16, Q17, Q18, Q19.
More specifically, the discharge switch is made of triode, specifically it is made of Q20, Q21, Q22, Q23.
A kind of charging method of lithium battery, uses the lithium electric protection plate of above-mentioned self-adapting charging voltage, the charging
Method comprises the following steps：
Step 1: [PACK+] of lithium battery pack, [PACK-] are connecing charger just respectively, both ends are born, the discharge and recharge is special
With each batteries of chip U3 detection lithium battery packs, when detecting each batteries of lithium battery pack in the range of 2.5-4.15V
When, MCU controls close charge switch, and discharge switch is closure all the time in the charge state, and charging current passes through [PACK+],
Fuse, each batteries, charge the battery, fill for the resistance of current detecting, [discharge switch], [charge switch], [PACK-]
Discharge and recharge special chip U3 detects cell voltage in real time in electric process, temperature, current data, when data exceed setting value, MCU
Instruction is provided, disconnects charge switch.
Step 2: cell voltage reaches 4.16V/ when often saving, charge switch is disconnected, into simulation trickle charge state, this
When MCU control trickle charge line clear, at this time trickle-charge current pass through [PACK+], [fuse], each batteries, for electricity
The resistance of detection is flowed, trickle charge circuit, [PACK-] charges the battery, when detecting that cell voltage is often saved in 4.2V/, table
Show that battery is full of, turn off trickle charge circuit.
A kind of charging method of lithium battery, uses the lithium electric protection plate of above-mentioned self-adapting charging voltage, the charging
Method comprises the following steps：
Step 1: [PACK+] of lithium battery pack, [PACK-] are connecing charger just respectively, both ends are born, the discharge and recharge is special
With each batteries of chip U3 detection lithium battery packs, when detecting each batteries of lithium battery pack in the range of 2.5-4.15V
When, MCU controls close charge switch, and discharge switch is closure all the time in the charge state, and charging current passes through [PACK+],
Fuse, each batteries, charge the battery, fill for the resistance of current detecting, [discharge switch], [charge switch], [PACK-]
Discharge and recharge special chip U3 detects cell voltage in real time in electric process, temperature, current data, when data exceed setting value, MCU
Instruction is provided, disconnects charge switch.
Step 2: cell voltage reaches 4.16V/ when often saving, charge switch is disconnected, into simulation trickle charge state, this
When MCU give Q25 high potentials, open Q25, Q26, Q14, Q15, the R57, Q14, Q15, R32, Q26 composition low current constant-current contours
Road, at this time trickle-charge current pass through [PACK+], [fuse], each batteries, for the resistance of current detecting, [Q15],
[PACK-] charges the battery, and when detecting that cell voltage is often saved in 4.2V/, represents that battery is full of, shut-off trickle charge control
Triode Q25.
As shown in Figure 1：U3 is discharge and recharge special chip, is responsible for detection cell voltage, electric current, temperature, and by above-mentioned data
It is sent to program management MCU chip U2, U2 to be charged according to obtained data, discharges, the various controls such as preliminary filling.
When needing charging, [PACK+] of battery pack, [PACK-] is connecing charger just respectively, bears both ends, and U3 can detect electricity
Each batteries of Chi Bao, when detecting each batteries of battery pack when in the range of 2.5-4.15V, MCU is controlled charge switch
(Q16, Q17, Q18, Q19) is closed, and discharge switch (Q20, Q21, Q22, Q23) is closure all the time in the charge state, is charged
Electric current passes through [PACK+], [F1], [BAT4, BAT3, BAT2, BAT1], [R63], [discharge switch], [charge switch], [PACK-]
Charge the battery, detect cell voltage in charging process in real time, temperature, current data, when data exceed setting value, MCU gives
Go out specified, disconnection charge switch [Q16, Q17, Q18, Q19].
Constant-voltage charge：Traditional charger output voltage precision height meets the requirements, be charged in cell voltage [4.12-
4.15V/ is often saved] scope when, charger can be gradually decreased automatically into constant voltage mode, charging current, when detecting cell voltage
At [4.2V/ is often saved], represent that battery is full of, disconnect charge switch [Q16, Q17, Q18, Q19].
It is the utility model actual circuit as shown in Figure 2, when charger output voltage is excessive, by simulating trickle charge
Mode, battery pack can be equally full of, concrete principle：Charge electricity when detecting battery [4.12-4.16V/ is often saved]
Stream does not start to also reduce, it is believed that charger output voltage is excessive, continues to charge and detects cell voltage in real time, works as cell voltage
When reaching [4.16V/ is often saved], charge switch [Q16, Q17, Q18, Q19] is disconnected.Into simulation trickle charge state, at this time MCU
[Q25] high potential is given, opens [Q25], [Q26, Q14, Q15] pipe can also be opened, wherein [R57, Q14, Q15, R32, Q26] group
Into low current constant current circuit, (constant current principle such as Fig. 3), at this time trickle-charge current pass through [PACK+], [F1], [BAT4, BAT3,
BAT2, BAT1], [R57], [Q15], [PACK-] charges the battery, and when detecting cell voltage [4.2V/ is often saved], represents
Battery is full of, shut-off trickle charge control pipe Q25.
As shown in Figure 3：All turned on into trickle state, Q25, Q26, Q14, Q15, the size of trickle current depends on Q14
(b-e) junction voltage and R57 resistance values, such as Fig. 3 parameters, Q14 (b-e) junction voltages 0.7V, R5=2R, electric current steady state value I=0.7V/
2R, I=0.35A.
Constant current principle：If trickle current is more than 0.35A, Q14 (b-e) junction voltage is more than 0.7V, Q14 conductings, Q15 (b-
E) junction voltage is equal to the voltage after Q14 (e-c) conductings, and about 0.3V, Q15 can end, so can be by the constant 0.35A of electric current
In conclusion the utility model has the following advantages：
1st, it is always a bottleneck for perplexing charger that lithium electricity charger is high to output voltage precision, and factory needs to put into big
The manpower of amount, material resources.The fraction defective of charger can be greatly reduced in the appearance of this product, reduce cost, improve efficiency, while
Reduce the charging risk of battery pack.
2nd, the utility model is a kind of lithium electric protection plate of self-adapting charging voltage, as long as ensureing that charging voltage can allow electricity
The lower limit that pond is full of, is not strict with the upper limit, is adapted to various charging voltages, the phase is automatic after charging for this circuit
Constant pressure trickle charge is simulated, it is unrelated with charging voltage, it is also ensured that battery is full of.
It is understood that above with respect to the specific descriptions of the utility model, it is merely to illustrate the utility model and is not
The described technical solution of the utility model embodiment is limited to, it will be understood by those of ordinary skill in the art that, do not departing from
In the case of the spirit and scope that claim is limited, it can modify to the utility model or equivalent substitution, to reach
Identical technique effect, but all within the scope of protection of the utility model.
Claims (4)
1. a kind of lithium electric protection plate of self-adapting charging voltage, including fuse, program management MCU chip U2, discharge and recharge are special
Chip U3, it is characterised in that：Further include the resistance for current detecting, discharge switch, charge switch and trickle charge circuit, institute
State trickle charge circuit is full of electric quantity of lithium battery for the simulation constant pressure trickle charge in the lithium battery charging later stage, the discharge and recharge
Special chip U3 is used to detect lithium battery voltage, electric current and temperature, and voltage, electric current and temperature data are sent to program management
MCU chip U2, described program management MCU chip U2 charge according to obtained voltage, electric current and temperature data, discharge, in advance
The various controls such as fill；
[PACK+] of lithium battery pack, [PACK-] are connecing charger just respectively, bear both ends, the discharge and recharge special chip U3 detections
Each batteries of lithium battery pack, when detecting each batteries of lithium battery pack when in the range of lithium battery preset charge voltage, MCU
Control closes charge switch, and discharge switch is closure all the time in the charge state, and charging current passes through [PACK+], fuse,
Each batteries, charge the battery for the resistance of current detecting, [discharge switch], [charge switch], [PACK-], charging process
Middle discharge and recharge special chip U3 detects cell voltage, temperature, current data, when data exceed lithium battery preset charge voltage in real time
During value, MCU provides instruction, disconnects charge switch；
The trickle charge circuit includes three resistance, four triodes, a diode, three resistance R21, R32,
R57 represents that four triodes Q25, Q26, Q14, Q15 are represented, one diode is represented with D2, three pole
The base stage B of pipe Q25 is connected with program management MCU chip U2, and the collector C of triode Q25 is connected with VDD, the hair of triode Q25
Emitter-base bandgap grading E is connected with the cathode of diode D2 and one end of resistance R21 respectively, the anode of the diode D2 respectively with resistance R57
One end connected with the emitter E of triode Q14, the other end of the resistance R57 base stage B and triode with triode Q14 respectively
The emitter E connection of Q15, the collector C of triode Q14 connect with one end of the base stage B and resistance R32 of triode Q15 respectively
Connect, the collector C of triode Q15 is connected with the emitter E of triode Q26, and the collector C's and resistance R32 of triode Q26 is another
One end connects, and the base stage B of triode Q26 is connected with the other end of resistance R21；
When cell voltage is often saved more than lithium battery preset charge voltage 0.01-0.03V/, charge switch is disconnected, into simulation trickle
Charged state, at this time MCU give Q25 high potentials, open Q25, Q26, Q14, Q15, the R57, Q14, Q15, R32, Q26 compositions are small
Electric current constant current circuit, at this time trickle-charge current pass through [PACK+], [fuse], each batteries, for the resistance of current detecting,
[Q15], [PACK-] charge the battery, when detecting that cell voltage is often saved more than lithium battery preset charge voltage 0.04V/, table
Show that battery is full of, shut-off trickle charge control triode Q25.
2. the lithium electric protection plate of self-adapting charging voltage according to claim 1, it is characterised in that：The lithium battery is preset
Charging voltage is 2.5-4.15V.
3. the lithium electric protection plate of self-adapting charging voltage according to claim 1, it is characterised in that：The charge switch by
Triode forms.
4. the lithium electric protection plate of self-adapting charging voltage according to claim 1, it is characterised in that：The discharge switch by
Triode forms.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201721258756.1U CN207339340U (en) | 2017-09-28 | 2017-09-28 | A kind of lithium electric protection plate of self-adapting charging voltage |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107742907A (en) * | 2017-09-28 | 2018-02-27 | 苏州华之杰电讯股份有限公司 | The lithium electric protection plate and lithium cell charging method of a kind of self-adapting charging voltage |
| CN114156956A (en) * | 2020-09-07 | 2022-03-08 | 北京小米移动软件有限公司 | Battery cell protection circuit, battery and terminal equipment |
-
2017
- 2017-09-28 CN CN201721258756.1U patent/CN207339340U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107742907A (en) * | 2017-09-28 | 2018-02-27 | 苏州华之杰电讯股份有限公司 | The lithium electric protection plate and lithium cell charging method of a kind of self-adapting charging voltage |
| CN107742907B (en) * | 2017-09-28 | 2023-09-26 | 苏州华之杰电讯股份有限公司 | Lithium battery protection plate capable of self-adapting to charging voltage and lithium battery charging method |
| CN114156956A (en) * | 2020-09-07 | 2022-03-08 | 北京小米移动软件有限公司 | Battery cell protection circuit, battery and terminal equipment |
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