CN112838647A - Lithium ion battery circuit with multiple protection functions - Google Patents
Lithium ion battery circuit with multiple protection functions Download PDFInfo
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- CN112838647A CN112838647A CN202110216312.6A CN202110216312A CN112838647A CN 112838647 A CN112838647 A CN 112838647A CN 202110216312 A CN202110216312 A CN 202110216312A CN 112838647 A CN112838647 A CN 112838647A
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- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 title claims abstract description 48
- 229910001416 lithium ion Inorganic materials 0.000 title claims abstract description 48
- 238000007599 discharging Methods 0.000 claims abstract description 28
- 230000002265 prevention Effects 0.000 claims abstract description 6
- 238000005070 sampling Methods 0.000 claims description 15
- 101000908580 Homo sapiens Spliceosome RNA helicase DDX39B Proteins 0.000 claims description 3
- 102100021298 b(0,+)-type amino acid transporter 1 Human genes 0.000 claims description 3
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 19
- 229910052744 lithium Inorganic materials 0.000 description 19
- 238000010586 diagram Methods 0.000 description 5
- 238000013461 design Methods 0.000 description 3
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 230000004807 localization Effects 0.000 description 1
- 229910044991 metal oxide Inorganic materials 0.000 description 1
- 150000004706 metal oxides Chemical class 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 230000017105 transposition Effects 0.000 description 1
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
- H02J7/00302—Overcharge protection
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
- H02J7/00306—Overdischarge protection
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
- H02J7/00309—Overheat or overtemperature protection
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
- H02J7/0031—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits using battery or load disconnect circuits
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
- H02J7/0034—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits using reverse polarity correcting or protecting circuits
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
- H02J7/0036—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits using connection detecting circuits
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0047—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with monitoring or indicating devices or circuits
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The invention provides a lithium ion battery circuit with multiple protection functions, which comprises a charging anti-reverse-connection circuit, a temperature sensor double-circuit parallel temperature protection circuit, a charging double-circuit switch MOS series protection circuit, a discharging double-circuit switch MOS series protection circuit, a battery charging and discharging fuse protection circuit, each battery voltage overcharge and overdischarge protection circuit, a battery charging overcurrent protection circuit and a battery discharging overcurrent protection circuit. The invention adopts an integrated chip as a main control, and collects the voltage of each BATTERY (BATTERY 1-BAT 10). The safety of the lithium ion battery can be ensured during charging and discharging. Meanwhile, the protection circuit has multiple protection functions of charging, discharging overcurrent protection, temperature protection, reverse charging prevention, fuse and the like.
Description
Technical Field
The invention relates to the technical field of electronic circuits, in particular to a lithium ion battery circuit with multiple protection functions.
Background
Lithium ion batteries are widely used as power sources for most mobile devices, and their protection problems become especially important because if a circuit fails, the battery is permanently damaged if light, and the device is damaged if heavy, or even a safety problem occurs. In order to ensure that the lithium ion battery can work safely and efficiently in the charging and discharging process, the design of the lithium ion battery protection circuit is very critical. The integrated protection circuit for the lithium ion battery is generally effective to monitor and prevent damage to the lithium ion battery through the respective protection unit circuits.
For example, cn201420205429.x discloses a lithium battery protection circuit, which comprises a first MOS transistor, a second MOS transistor and a temperature sensing element; the first protection chip is used for providing overcharge, overdischarge, overcurrent and short-circuit protection for the lithium battery, and the second protection chip is used for performing charge protection and overheat protection for the lithium battery. Simultaneously, can detect the temperature of lithium cell and external environment through temperature-sensing element and input the second protection chip, thereby the second protection chip adjusts charging current according to the testing result, prevents that the lithium cell is overheated.
CN201920238994.9 discloses a low-power consumption lithium battery protection circuit, including resistance (R1-R15), MOS pipe (Q1-Q6), lithium cell (BT1-BT6), switch S1, triode Q7, power BT7, lithium cell (BT1-BT6) concatenates in proper order, and the input end ground connection of lithium cell BT1, the output end of lithium cell BT6 concatenates resistance R1 and connects the collecting electrode of triode Q7 in series, and the base of triode Q7 concatenates resistance R14 and switch S1 in proper order and connects the output end of power BT 7. The MOS transistors (Q1-Q6) are conducted by closing the switch S1, the circuit starts to consume power, and the circuit can be switched between an operating state and an off power-saving state by opening and closing the connected switch S1.
CN202021071830.0 discloses a lithium cell protection circuit, including first protection MOS pipe that charges, first protection MOS pipe that discharges, second protection MOS pipe and relay charge, the output of second drive circuit U2 is connected with the grid of second protection MOS pipe that charges, and series connection relay between the drain electrode of second protection MOS pipe that charges and the battery positive pole, the normally closed contact first end of relay and the source electrode of first protection MOS pipe that charges are connected etc..
CN202010528680.X discloses a double-section series lithium battery protection circuit, which comprises a power management chip N1, an MOS tube V2 and a diode V1, wherein the source of the MOS tube V2 is connected with the anode of the diode V1, the cathode of the diode V1 is connected with the N1 pin of the power management chip, the drain of the MOS tube V2 is connected with the positive electrode of a battery, and the grid of the MOS tube V2 is connected with the negative electrode of the battery; when the battery is correctly installed, the grid of the MOS transistor V2 is at a low level, and the MOS transistor V2 is conducted; when the battery is reversely connected, the grid of the MOS tube V2 is at a high level, and the MOS tube V2 is turned off. The double-section series lithium battery protection circuit is designed based on a domestic chip and an MOS (metal oxide semiconductor) tube, and meets the development requirement of the localization of the protection circuit.
Disclosure of Invention
The invention adopts a series connection mode to carry out double protection, wherein when one group of MOS tubes is in short circuit, the other group of MOS tubes can normally cut off the circuit for protection, thereby providing a lithium ion battery circuit with multiple protection functions, and being capable of more safely protecting the lithium ion battery.
In order to achieve the purpose, the invention is realized by the following technical scheme:
the utility model provides a take multiple protect function lithium ion battery circuit, is including charging to prevent reverse connection circuit, the parallelly connected temperature protection circuit of temperature sensor double-circuit, the double-circuit switch MOS series protection circuit that charges, the double-circuit switch MOS series protection circuit that discharges, battery charge-discharge fuse protection circuit, every battery voltage overcharge, overdischarge protection circuit, battery charging overcurrent protection circuit, battery discharge overcurrent protection circuit:
a charging circuit: charging by charging positive pole C+Then, the current is led to anti-reverse diodes D1 and D2, current fusing fuses F1, F2 and F3 and at most a series of lithium ion battery anodes B+And multiple lithium ion battery cathodes B-The current is returned to the charging cathode C through the R37, the R38 current sampling resistor, the first charging protection MOS switch Q6 and the second charging protection MOS switch Q5-；
A discharge circuit: discharging multi-string lithium ion battery anode B+Then, the current blows the fuses F1, F2 and F3 to the positive pole P of the connected discharging load+Connecting the negative pole P of the discharge load-The loop is returned to the cathode B of the multi-string lithium ion battery through the first discharge protection MOS switches Q9, Q10, Q11 and the second discharge protection MOS switches Q4, Q7, Q8 and through the current sampling resistors R37, R38-；
Controlling the temperature of the battery: the TS pin of the integrated chip U1 samples the voltage of two temperature resistors R26 and R27, calculates the current temperature, when the temperature is higher or lower than the set allowable range during charging, the CHG of the integrated chip U1 outputs low level, and the first charging protection MOS switch Q6 and the second charging protection MOS switch Q5 disconnect the charging loop; when the temperature is higher or lower than the set allowable range during discharging, the DSG of the integrated chip U1 outputs low level, and the first discharge protection MOS switches Q9, Q10 and Q11 and the second discharge protection MOS switches Q4, Q7 and Q8 disconnect a discharge loop;
controlling the voltage of the battery: VC1, VC2, VC3, VC4, VC5, VC6, VC7, VC8, VC9 and VC10 of the integrated chip U1 correspond to each string of lithium ion batteries BAT10 to BAT1, the voltage of each string of lithium ion batteries is sampled, when the batteries are charged, and the voltage of a single string or a single lithium ion battery or the total battery is higher than a set voltage value, the CHG of the integrated chip U1 outputs low level, and the first charging protection MOS switch Q6 and the second charging protection MOS switch Q5 disconnect a charging loop; when the battery discharges to the load, and the voltage of a single-string or single-section lithium ion battery or the total battery is lower than a set voltage value, the DSG of the integrated chip U1 outputs low level, and the first discharge protection MOS switches Q9, Q10 and Q11 and the second discharge protection MOS switches Q4, Q7 and Q8 disconnect a discharge loop;
controlling the current of the battery: during charging, controlling charging current: RS1 and RS2 of the integrated chip U1 sample the current of the current sampling resistors R37 and R38, when the charging current is larger than a set value, the CHG of the integrated chip U1 outputs low level, and the first charging protection MOS switch Q6 and the second charging protection MOS switch Q5 disconnect a charging loop; during discharging, discharge current control: when the RS1 and RS2 of the integrated chip U1 perform current sampling on the current sampling resistors R37 and R38, and when the discharge current is greater than the set value, the DSG of the integrated chip U1 outputs a low level, and the first discharge protection MOS switches Q9, Q10 and Q11 and the second discharge protection MOS switches Q4, Q7 and Q8 disconnect the discharge loop.
Further: the charging reverse connection prevention circuit comprises: in the charging anode loop, charging is connected with a charging anode C through two parallel diodes D1 and D2+Connected with a charged cathode C-Two parallel diodes D1 and D2 are conducted in forward direction to form a charging loop, and the charging loop is connected with a charging cathode C-Is connected with a charging anode C+The two parallel diodes D1 and D2 are turned off in the reverse direction and cannot be charged.
Further: the charging double-circuit switch MOS series protection circuit is composed of a first charging protection MOS switch Q6 and a second charging protection MOS switch Q5, two MOS of the first charging protection MOS switch Q6 and the second charging protection MOS switch Q5 are connected in series on the circuit, when one MOS is in short circuit or open circuit, the charging circuit is disconnected, the CHG of the integrated chip U1 outputs low level, and the other MOS can normally disconnect the charging loop.
Further: the discharge double-way switch MOS series protection circuit is characterized in that three MOS switches Q9, Q10 and Q11 are connected in parallel, and after three MOS switches Q4, Q7 and Q8 are connected in parallel, two groups of MOS are connected in series to form double-way discharge MOS protection; when one group of MOS is short-circuited or open-circuited, the DSG of the integrated chip U1 outputs low level, and the other group of MOS also can normally disconnect the discharge loop. The safety of the lithium ion battery is ensured.
Further: the battery charge-discharge fuse protection circuit is characterized in that three fuse fuses F1, F2 and F3 are connected in parallel in a charge-discharge anode loop, when the charge or discharge current reaches the fuse current, the fuse fuses, the charge-discharge circuit is opened, and the safety of the battery is protected.
The invention has the following beneficial effects: an integrated chip is used as a main control unit, and the voltage of each BATTERY (BATTERY 1-BAT 10) is collected.
And (4) charging and discharging overcurrent protection, wherein the integrated chip U1 samples the R37R 38 resistor current in the main circuit, and if the current exceeds the designed current value, the charging MOS or the discharging MOS tube is turned off, so that the safety of the battery is ensured.
And for charging and discharging temperature protection, the integrated chip U1 samples the temperature of a temperature sensor R26R 27(NTC) in the circuit, and if the temperature exceeds the allowable value of a cell, the charging or discharging MOS tube is turned off.
The reverse charging prevention design is characterized in that the charging loop is connected with the diodes D1 and D2 which are conducted in a single direction, when the charger is reversely connected, the diodes are reverse and cannot be conducted to form the charging loop, and the circuit and the battery can be protected from being damaged when reversely connected.
The fusing insurance is as last safe guarantee, prevents to charge or discharge under the whole damage condition of MOS, to battery unusual charge-discharge, when the electric current surpassed fusing insurance electric current, fusing insurance direct fusing, and the battery can not resume the use again, prevents that safety problems such as the battery appears catching fire, burning.
In a word, the invention adopts a lithium battery protection chip dual MOS series connection plus a fuse to form a multiple protection circuit, wherein when one group of MOS tubes are in short circuit, the other group of MOS tubes can normally cut off the circuit for protection, thereby achieving double protection, and meanwhile, under the condition that the MOS tubes are invalid, the lithium battery protection chip can also normally protect the lithium battery, thereby preventing safety accidents from happening and more safely protecting the use of the lithium battery.
Drawings
FIG. 1 is a schematic diagram of the design of the present invention;
FIG. 2 is a circuit diagram of series control of two MOS transistors for charging according to the present invention;
FIG. 3 is a partial enlarged view of the series control circuit for charging two MOS transistors according to the present invention;
FIG. 4 is a circuit diagram of a series control circuit for two groups of MOT tubes for discharging according to the present invention;
FIG. 5 is a circuit diagram of a cut-open fuse of the present invention;
fig. 6 is a circuit diagram of the unidirectional charging reverse connection prevention circuit of the invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example (b):
as shown in fig. 1-6, a lithium ion battery circuit with multiple protection functions comprises a charging anti-reverse-connection circuit, a temperature sensor dual-path parallel temperature protection circuit, a charging dual-path switch MOS series protection circuit, a discharging dual-path switch MOS series protection circuit, a battery charging and discharging fuse protection circuit, each battery voltage overcharge and overdischarge protection circuit, a battery charging overcurrent protection circuit, and a battery discharging overcurrent protection circuit.
In the embodiment, a plurality of strings of lithium battery protection integrated chips U1 have monitoring functions on the voltage, the temperature, the charging current and the discharging current of the lithium ion battery;
the charging MOS is independently applied to a charging loop and is mainly used for disconnecting the lithium ion battery from overvoltage charging, overcurrent charging and over-low or over-high temperature charging;
the discharge protection MOS is independently applied to a discharge loop, lithium ions are mainly used for discharging an external load, and the protection battery is disconnected when the voltage is too low, the discharge current is over-current, and the temperature of the discharge battery is too low or too high;
d1 and D2 have the characteristics of diodes, and have the functions of forward conduction and reverse cut-off, so that a charger can only charge the battery in the forward direction, and the reverse connection of the battery cannot form current, thereby protecting the safety of the lithium battery. The problem of charging wire transposition is solved.
A charging circuit: charging by charging positive pole C+Then, the current is led to anti-reverse diodes D1 and D2, current fusing fuses F1, F2 and F3 and at most a series of lithium ion battery anodes B+And multiple lithium ion battery cathodes B-The current is returned to the charging cathode C through the R37, the R38 current sampling resistor, the first charging protection MOS switch Q6 and the second charging protection MOS switch Q5-；
A discharge circuit: discharging multi-string lithium ion battery anode B+Then, the current blows the fuses F1, F2 and F3 to the positive pole P of the connected discharging load+Connecting the negative pole P of the discharge load-The loop is returned to the cathode B of the multi-string lithium ion battery through the first discharge protection MOS switches Q9, Q10, Q11 and the second discharge protection MOS switches Q4, Q7, Q8 and through the current sampling resistors R37, R38-；
Controlling the temperature of the battery: a TS pin (13) of the integrated chip U1 samples the voltage of two temperature resistors R26 and R27, the current temperature is calculated, when the temperature is higher than or lower than a set allowable range during charging, a CHG (7) of the integrated chip U1 outputs a low level, and the first charging protection MOS switch Q6 and the second charging protection MOS switch Q5 disconnect a charging loop; when the temperature is higher or lower than the set allowable range during discharging, the DSG (8) of the integrated chip U1 outputs low level, and the first discharge protection MOS switches Q9, Q10 and Q11 and the second discharge protection MOS switches Q4, Q7 and Q8 disconnect a discharge loop;
controlling the voltage of the battery: VC1 (28), VC2 (27), VC3 (26), VC4 (25), VC5 (24), VC6 (21), VC7(20), VC8 (19), VC9 (18) and VC10 (17) of the integrated chip U1 correspond to each string of lithium ion batteries BAT10 to BAT1, the voltage of each string of lithium ion batteries is sampled, when the batteries are charged, a single string or a single lithium ion battery or the total battery voltage is higher than a set voltage value, CHG (7) of the integrated chip U1 outputs low level, and the first charging protection MOS switch Q6 and the second charging protection MOS switch Q5 disconnect a charging loop; when the battery discharges to the load, and the voltage of a single-string or single-section lithium ion battery or the total battery is lower than a set voltage value, the DSG (8) of the integrated chip U1 outputs low level, and the first discharge protection MOS switches Q9, Q10 and Q11 and the second discharge protection MOS switches Q4, Q7 and Q8 disconnect a discharge loop;
controlling the current of the battery: during charging, controlling charging current: RS1(12) and RS2(11) of the integrated chip U1 sample the current of the current sampling resistors R37 and R38, when the charging current is larger than a set value, CHG (7) of the integrated chip U1 outputs low level, and the first charging protection MOS switch Q6 and the second charging protection MOS switch Q5 disconnect a charging loop; during discharging, discharge current control: when the RS1(12) and RS2(11) of the integrated chip U1 perform current sampling on the current sampling resistors R37 and R38, and when the discharge current is greater than a set value, the DSG (8) of the integrated chip U1 outputs a low level, and the first discharge protection MOS switches Q9, Q10, and Q11 and the second discharge protection MOS switches Q4, Q7, and Q8 disconnect the discharge loop.
Wherein: the charging reverse connection prevention circuit comprises: in the charging anode loop, charging is connected with a charging anode C through two parallel diodes D1 and D2+Connected with a charged cathode C-Two parallel diodes D1 and D2 are conducted in forward direction to form a charging loop, and the charging loop is connected with a charging cathode C-Is connected with a charging anode C+The two parallel diodes D1 and D2 are turned off in the reverse direction and cannot be charged.
The charging double-circuit switch MOS series protection circuit is composed of a first charging protection MOS switch Q6 and a second charging protection MOS switch Q5, two MOS of the first charging protection MOS switch Q6 and the second charging protection MOS switch Q5 are connected in series on the circuit, when one MOS is in short circuit or open circuit, the charging circuit is disconnected, the CHG (7) of the integrated chip U1 outputs low level, and the other MOS can normally disconnect the charging loop.
The discharge double-way switch MOS series protection circuit is characterized in that three MOS switches Q9, Q10 and Q11 are connected in parallel, and after three MOS switches Q4, Q7 and Q8 are connected in parallel, two groups of MOS are connected in series to form double-way discharge MOS protection; when one group of MOS is short-circuited or open-circuited, the DSG (8) of the integrated chip U1 outputs low level, and the other group of MOS also can normally break a discharge loop. The safety of the lithium ion battery is ensured.
The battery charge-discharge fuse protection circuit is characterized in that three fuse fuses F1, F2 and F3 are connected in parallel in a charge-discharge anode loop, when the charge or discharge current reaches the fuse current, the fuse fuses, the charge-discharge circuit is opened, and the safety of the battery is protected.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (5)
1. The utility model provides a take multiple protect function lithium ion battery circuit, is including charging to prevent reverse connection circuit, the parallelly connected temperature protection circuit of temperature sensor double-circuit, the double-circuit switch MOS series protection circuit that charges, the double-circuit switch MOS series protection circuit that discharges, battery charge-discharge fuse protection circuit, every battery voltage overcharge, overdischarge protection circuit, battery charging overcurrent protection circuit, battery discharge overcurrent protection circuit, its characterized in that:
a charging circuit: charging by charging positive pole C+Then, the current is led to anti-reverse diodes D1 and D2, current fusing fuses F1, F2 and F3 and at most a series of lithium ion battery anodes B+And multiple lithium ion battery cathodes B-The current is returned to the charging cathode C through the R37, the R38 current sampling resistor, the first charging protection MOS switch Q6 and the second charging protection MOS switch Q5-；
A discharge circuit: discharging from multiple strings of lithium ion batteriesPole B+Then, the current blows the fuses F1, F2 and F3 to the positive pole P of the connected discharging load+Connecting the negative pole P of the discharge load-The loop is returned to the cathode B of the multi-string lithium ion battery through the first discharge protection MOS switches Q9, Q10, Q11 and the second discharge protection MOS switches Q4, Q7, Q8 and through the current sampling resistors R37, R38-；
Controlling the temperature of the battery: a TS pin (13) of the integrated chip U1 samples the voltage of two temperature resistors R26 and R27, the current temperature is calculated, when the temperature is higher than or lower than a set allowable range during charging, a CHG (7) of the integrated chip U1 outputs a low level, and the first charging protection MOS switch Q6 and the second charging protection MOS switch Q5 disconnect a charging loop; when the temperature is higher or lower than the set allowable range during discharging, the DSG (8) of the integrated chip U1 outputs low level, and the first discharge protection MOS switches Q9, Q10 and Q11 and the second discharge protection MOS switches Q4, Q7 and Q8 disconnect a discharge loop;
controlling the voltage of the battery: VC1 (28), VC2 (27), VC3 (26), VC4 (25), VC5 (24), VC6 (21), VC7(20), VC8 (19), VC9 (18) and VC10 (17) of the integrated chip U1 correspond to each string of lithium ion batteries BAT10 to BAT1, the voltage of each string of lithium ion batteries is sampled, when the batteries are charged, a single string or a single lithium ion battery or the total battery voltage is higher than a set voltage value, CHG (7) of the integrated chip U1 outputs low level, and the first charging protection MOS switch Q6 and the second charging protection MOS switch Q5 disconnect a charging loop; when the battery discharges to the load, and the voltage of a single-string or single-section lithium ion battery or the total battery is lower than a set voltage value, the DSG (8) of the integrated chip U1 outputs low level, and the first discharge protection MOS switches Q9, Q10 and Q11 and the second discharge protection MOS switches Q4, Q7 and Q8 disconnect a discharge loop;
controlling the current of the battery:
during charging, controlling charging current: RS1(12) and RS2(11) of the integrated chip U1 sample the current of the current sampling resistors R37 and R38, when the charging current is larger than a set value, CHG (7) of the integrated chip U1 outputs low level, and the first charging protection MOS switch Q6 and the second charging protection MOS switch Q5 disconnect a charging loop; during discharging, discharge current control: when the RS1(12) and RS2(11) of the integrated chip U1 perform current sampling on the current sampling resistors R37 and R38, and when the discharge current is greater than a set value, the DSG (8) of the integrated chip U1 outputs a low level, and the first discharge protection MOS switches Q9, Q10, and Q11 and the second discharge protection MOS switches Q4, Q7, and Q8 disconnect the discharge loop.
2. The lithium ion battery circuit with multiple protection functions of claim 1, wherein: the charging reverse connection prevention circuit comprises: in the charging anode loop, charging is connected with a charging anode C through two parallel diodes D1 and D2+Connected with a charged cathode C-Two parallel diodes D1 and D2 are conducted in forward direction to form a charging loop, and the charging loop is connected with a charging cathode C-Is connected with a charging anode C+The two parallel diodes D1 and D2 are turned off in the reverse direction and cannot be charged.
3. The lithium ion battery circuit with multiple protection functions of claim 1, wherein: the charging double-circuit switch MOS series protection circuit is composed of a first charging protection MOS switch Q6 and a second charging protection MOS switch Q5, two MOS of the first charging protection MOS switch Q6 and the second charging protection MOS switch Q5 are connected in series on the circuit, when one MOS is in short circuit or open circuit, the charging circuit is disconnected, the CHG (7) of the integrated chip U1 outputs low level, and the other MOS can normally disconnect the charging loop.
4. The lithium ion battery circuit with multiple protection functions of claim 1, wherein: the discharge double-way switch MOS series protection circuit is characterized in that three MOS switches Q9, Q10 and Q11 are connected in parallel, and after three MOS switches Q4, Q7 and Q8 are connected in parallel, two groups of MOS are connected in series to form double-way discharge MOS protection; when one group of MOS is short-circuited or open-circuited, the DSG (8) of the integrated chip U1 outputs low level, and the other group of MOS also can normally break a discharge loop.
5. The lithium ion battery circuit with multiple protection functions of claim 1, wherein: the battery charge-discharge fuse protection circuit is characterized in that three fuse fuses F1, F2 and F3 are connected in parallel in a charge-discharge anode loop, when the charge or discharge current reaches the fuse current, the fuse fuses, the charge-discharge circuit is opened, and the safety of the battery is protected.
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| CN113555842A (en) * | 2021-07-22 | 2021-10-26 | 华斗数字科技(上海)有限公司 | System of intelligent Internet of things power supply terminal |
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