CN217956733U

CN217956733U - Control circuit of lithium battery energy storage power supply

Info

Publication number: CN217956733U
Application number: CN202221557385.8U
Authority: CN
Inventors: 鲍旭东; 李友国; 范谦; 杨威
Original assignee: Zhejiang Lvli Machinery Co ltd
Current assignee: Zhejiang Lvli Machinery Co ltd
Priority date: 2022-06-21
Filing date: 2022-06-21
Publication date: 2022-12-02
Anticipated expiration: 2032-06-21

Abstract

The utility model relates to a control circuit of lithium battery energy storage power supply, on the basis of the existing lithium battery protection board, in addition, a set of control circuit is arranged at the periphery of the protection board, the control part mainly comprises a charging control circuit and a discharging control circuit, the charging control circuit controls the charging and the protection of a charger or a solar panel to the lithium battery, the low-voltage control switch part of the discharging control circuit can open 12V low-voltage output and UBS mobile phone charging output, and the high-voltage control switch part of the discharging control circuit can open 220V alternating current output; the charging voltage has the advantages of wide application range, simple structure, cost control and the like.

Description

Control circuit of lithium battery energy storage power supply

Technical Field

The utility model relates to a control circuit of energy storage battery specifically is a control circuit of lithium cell energy storage power.

Background

With the increasing shortage of world energy supply and the increasing requirement on environmental protection, the supporting force of countries in the world on related industries is also continuously increased; the lithium ion battery has excellent technical performance, the cost is greatly reduced in recent years, the lithium ion battery initially has basic conditions for large-scale application, and the lithium ion battery is widely considered to be pioneering force for promoting the wide application of energy storage technology in five years in the future in the industry.

At present, a conventional lithium iron phosphate lithium battery control circuit is shown in fig. 1, wherein V1-V10 are 10 single lithium batteries, two BM3451 lithium battery protection chips and peripheral elements thereof form a lithium battery protection board, P + and P-are common ports for charging and discharging of the lithium batteries, field effect transistors T100 and T101 in a charging or discharging state are both turned on, when full charging is performed, the chip controls T101 to be turned off, charging is stopped, and when the electric quantity is exhausted, the chip controls T100 to be turned off, and discharging is stopped.

The lithium battery has the advantages of high energy density, small volume and light weight, is widely applied to small household energy storage power supplies, is mainly used in underdeveloped areas with abnormal power supply and remote areas, and is simple in operation, low in production cost and reliable in operation.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a control circuit of lithium battery energy storage power supply, on the basis of current lithium battery protection shield, set up a set of control circuit in addition in the periphery of protection shield, the control part mainly comprises charge control circuit and discharge control circuit, charge control circuit control charger or solar panel to the lithium cell charge and protect, the low pressure control switch part of discharge control circuit can open 12V low pressure output and UBS cell-phone charge output, the high pressure control switch part of discharge control circuit can open 220V alternating current output; the charging voltage has the advantages of wide application range, simple structure, cost control and the like.

The following technical scheme is adopted for achieving the purpose:

the utility model provides a control circuit of lithium cell energy storage power which characterized in that: the lithium battery protection board is provided with a charging positive terminal CH +, a charging negative terminal CH-, a discharging positive terminal P + and a discharging negative terminal P-, the discharging positive terminal P + is connected with the positive terminal of the lithium battery group, a discharging switch consisting of a field effect tube T100 and a diode D100 is connected between the negative terminal and the P-terminal of the lithium battery group, a charging control circuit and a discharging control circuit are also connected between the lithium battery protection board and the charging positive terminal CH + and the charging negative terminal CH-, and the charging control circuit comprises an isolation control charging switch circuit, a lossless reverse connection protection circuit, an overvoltage protection circuit and an IC sampling port voltage limiting control circuit; the discharge control circuit comprises a low-voltage control switch circuit and a high-voltage control switch circuit.

The isolation control charging switch circuit comprises a CO port of a lithium-ion protection chip IC1, a grid electrode of a field-effect tube T103 is connected through a resistor R103, a drain electrode of the field-effect tube T103 is connected with a negative electrode of an optocoupler G102 light-emitting diode, an anode of the optocoupler G102 light-emitting diode and a resistor R104, the resistor R104 is connected with an emitter of the optocoupler G102 light-emitting triode, a collector electrode of the resistor R104 is connected with a negative electrode of a D109, an anode of the D109 is connected with a charging input port CH +, and a source electrode of the field-effect tube T103 is connected with a zero potential end of a lithium battery pack; the negative electrode of the D109 is simultaneously connected with the resistor R105, the other end of the resistor R105 is connected with the collector of the optocoupler G102 triode, the emitter of the G102 triode is connected with the positive electrode of the diode D104, the negative electrode of the diode D104 is respectively connected with the voltage regulator tube D105, the resistor 106 and the grid electrode of the field effect tube T102, the voltage regulator tube D105 and the other end of the resistor 106 are connected with the charging negative input end CH-, the charging positive input end CH + connection port P +, the source electrode of the field effect tube T102 is respectively connected with the positive electrode of the diode D102 and the charging negative input end CH-, the drain electrode of the field effect tube T102 is connected with the field effect tube T101 and the diode D101 to form a charging switch, the other end of the charging switch is connected with the current detection resistor Rsense through the current coil LK, and the other end of the current detection resistor Rsense is connected with the zero potential end of the lithium battery pack.

The lossless reverse connection protection circuit comprises a field effect transistor T101, a correlation resistor R102 is arranged between a grid electrode and a drain electrode of the field effect transistor T101, the grid electrode of the T101 is further connected with one end of a reed switch LK, meanwhile, the other control end of the reed switch LK is connected with the negative electrode of a diode D1, and the positive electrode of the diode D1 is connected with a CO port of a lithium-ion battery protection chip IC 1.

The overvoltage protection circuit comprises a diode D109, a resistor R108, a voltage regulator tube D106 and a resistor R107 between a charging positive input end CH + and a charging negative input end CH-, wherein the charging positive input end CH + is connected with the anode of the diode D109, the cathode of the diode D109 is respectively connected with the resistor R108 and the resistor R109, the other end of the resistor R108 is connected with the voltage regulator tube D106, the other end of the resistor R109 is connected with the anode of a diode of an optocoupler G103, the cathode of the diode of the optocoupler G103 is connected with the collector of a triode T104, the other end of the voltage regulator tube D106 is respectively connected with the base of the triode T104 and the resistor R107, the emitter of the triode T104 and the other end of the resistor R107 are connected with the charging negative input end CH-, the emitter of the triode G103 is connected with the source of a field effect tube T103, and the collector of the triode of the optocoupler G103 is connected with the grid of the field effect tube T103.

The sampling port is connected with a source electrode of a field effect transistor M1 connected with a lithium-ion protection chip IC1 VM port, a resistor RVM of a drain electrode of the field effect transistor M1 is connected with a resistor R110, the other end of the resistor R110 is connected with a source electrode of an optocoupler G104 field effect transistor, the other source electrode of the optocoupler G104 field effect transistor is connected with a charging negative input end CH-, meanwhile, the resistor RVM is also connected with a voltage regulator tube D107, the other end of the voltage regulator tube D107 is connected with one end of a resistor R111 and a negative electrode of a diode D109, the other end of the resistor R111 is connected with a positive electrode of an optocoupler G104 diode, a negative electrode of the optocoupler G104 diode is connected with a positive electrode of an optocoupler G101 diode, and the negative electrode of the optocoupler G101 diode is connected with the CH-end; in addition, the resistor RVM is also connected with R101, C100, D108 and R101 to be connected with a zero potential end of the lithium battery pack, the C100 is connected with a P-end, and the D108 is connected with a V5 port of the lithium battery pack. The low-voltage control switch circuit comprises a DO output end of a lithium battery control chip IC1, a resistor RDO, a discharge switch field-effect tube T100 and a switch KG1, wherein the switch RDO is connected between the grid electrodes of the discharge switch field-effect tube T100 at the other end of the resistor RDO in series; and a voltage converter is connected between the discharging anode port P + and the discharging cathode port P-, and the voltage converter is provided with 12V and 5V output ends.

The high-voltage control switch circuit comprises an inverter, wherein the input end of the inverter is respectively connected with the positive electrode and the negative electrode of a lithium battery pack, the control end of the inverter is connected with the collector and the emitter of an optocoupler G100 triode, the negative electrode of an optocoupler G100 diode is connected with a resistor R114, and the other end of the resistor R114 is connected with a discharging negative electrode port P & lt- & gt through a switch KG 2; the positive pole of the diode of the optocoupler G100 is connected with the drain electrode of the field effect transistor T105, the source electrode of the field effect transistor T105 is connected with the discharging positive pole port P +, the grid electrode of the field effect transistor T105 is connected with the resistor R113, and the other end of the resistor R113 is connected with the resistor RDO.

The utility model discloses with the separation of charging port and discharge port, consider that charge control generally all adopts external charging equipment, charging voltage all is higher than lithium battery voltage, and wind power generation, solar panel charge can be higher than lithium battery voltage about one time, sometimes with wrong charger, and voltage can be higher, and even still positive negative connection is reversed, the utility model discloses a constitute the charge control circuit by isolation control charge switch circuit, the protection circuit that connects conversely of harmless, overvoltage protection circuit and port sampling voltage limiting control circuit, the charge control part should be under complicated environment, in certain extent, can protect the safety of energy storage power; meanwhile, a low-voltage control switch of the discharge control circuit is added, 12V low-voltage output and UBS mobile phone charging output can be turned on, and a high-voltage control switch of the discharge control circuit turns on 220V alternating current output; the utility model has the advantages of wide voltage application range, simple structure, low cost, high reliability, convenient maintenance, and obvious advantages in the aspects of cost control, after-sale service and the like.

Drawings

FIG. 1 is a prior art lithium battery control circuit;

fig. 2 is a lithium battery control circuit of the present invention.

Detailed Description

As shown in fig. 2

A control circuit of an energy storage power supply of a lithium battery comprises a lithium battery pack and a lithium battery protection board consisting of lithium battery protection chips IC1 and IC2 and peripheral elements thereof, wherein the lithium battery protection board is provided with a charging positive terminal CH +, a charging negative terminal CH-, a discharging positive terminal P + and a discharging negative terminal P-, the discharging positive terminal P + is connected with the positive terminal of the lithium battery pack, a discharging switch consisting of a field effect tube T100 and a diode D100 is connected between the negative terminal and the P-terminal of the lithium battery pack, a charging control circuit and a discharging control circuit are also connected between the lithium battery protection board and the charging positive terminal CH + and the charging negative terminal CH-, and the discharging control circuit comprises a low-voltage control switch circuit and a high-voltage control switch circuit; the charging control circuit comprises an isolation control charging switch circuit, a lossless reverse connection protection circuit, an overvoltage protection circuit and an IC sampling port voltage limiting control circuit.

The isolation control charging switch circuit comprises a CO port of a lithium-ion protection chip IC1, a grid electrode of a field-effect tube T103 is connected through a resistor R103, a drain electrode of the field-effect tube T103 is connected with a negative electrode of an optocoupler G102 light-emitting diode, an anode of the optocoupler G102 light-emitting diode and a resistor R104, the resistor R104 is connected with an emitter of an optocoupler G101 light-emitting triode, a power collecting end of the optocoupler G101 light-emitting triode is connected with a negative electrode of a diode D109, an anode of the diode D109 is connected with a charging input end CH +, and a source electrode of the field-effect tube T103 is connected with a zero potential end of a lithium battery pack; the diode D109 is simultaneously connected with the resistor R105, the other end of the resistor R105 is connected with the collector of the optocoupler G102 triode, the emitter of the G102 triode is connected with the anode of the diode D104, the cathode of the diode D104 is respectively connected with the grids of the voltage regulator tube D105, the resistor 106 and the field-effect tube T102, the voltage regulator tube D105 and the other end of the resistor 106 are connected with the charging negative input end CH-, the charging positive input end CH + connection port P +, the source electrode of the field-effect tube T102 is respectively connected with the anode of the diode D102 and the charging negative input end CH-, the drain electrode of the field-effect tube T102 is connected with the field-effect tube T101 and the diode D101 to form a charging switch, the other end of the charging switch is connected with the current detection resistor Rsense through the current coil LK, and the other end of the current detection resistor Rsense is connected with the zero potential end of the lithium battery pack.

In the charging switch circuit of the isolation control, the charging control of a common lithium battery protection board directly controls the T101 to turn on or turn off the charging current through an IC1CO port; according to the invention, the IC1CO port firstly passes through a current loop of turning on T103 by R103, turning on G102 by T103, turning on CH +, D109, R105, D104, D105, R106 and CH-by a G102 triode, a starting voltage is applied to a grid electrode of T102, and a charging current is turned on or off by adopting a mode of isolating T102 from a chip IC1, so that the wide charging voltage range is adapted.

The lossless reverse connection protection circuit comprises a resistor R102 which is associated between a grid and a drain of a field effect transistor T101, the grid of the field effect transistor T101 is also connected with one end of a reed LK switch, meanwhile, the other control end of the reed switch LK is connected with the cathode of a diode D1, and the anode of the diode D1 is connected with a CO port of a lithium battery protection chip IC 1.

The lossless reverse connection protection is realized by adopting a mode of combining a field effect transistor T101 and a reed switch LK to carry out charging reverse connection protection control; the diode of the T101 is consistent with the charging direction, LK is attracted when the charging current reaches a certain amount, the port of the IC1CO applies opening voltage to the grid of the T101 through D1 and LK, the T101 is conducted, and if the charger is reversely connected with the D101 and the T101, the T101 cannot be conducted.

And over-voltage protection, when the voltage between CH + and CH-exceeds the rated voltage, a forward bias voltage is added to T104 by CH +, D109, R108, D106, R107 and a CH-loop to turn on T104, G103 is turned on, a triode of the forward bias voltage is short-circuited with the grid bias voltage of T103 to turn off T103, G102 is turned off, T102 is also turned off, charging is stopped, and charging over-voltage protection is realized.

The IC sampling port voltage-limiting control circuit is connected with a source electrode of a field effect transistor M1 at a port of a lithium electric protection chip IC1 VM, a drain electrode of the field effect transistor M1 is connected with a resistor RVM, the other end of the resistor RVM is connected with a source electrode of an optocoupler G104 field effect transistor through a resistor R110, the other end of the resistor R110 is connected with a drain electrode of the optocoupler G104 field effect transistor, and the drain electrode of the optocoupler G104 field effect transistor is connected with a charging negative input end CH-; meanwhile, the resistor RVM is also connected with a voltage regulator tube D107, the other end of the voltage regulator tube D107 is connected with the cathode of a diode D109 and a resistor R111, the other end of the resistor R111 is connected with the anode of a diode of an optocoupler G104, the cathode of the diode of the optocoupler G104 is connected with the anode of a diode of an optocoupler G101, and the cathode of the diode of the optocoupler G101 is connected with the CH-end; in addition, the resistor RVM is also connected with R101, C100, D108 and R101 to be connected with a zero potential end of the lithium battery pack, the C100 is connected with a P-end, and the D108 is connected with a V5 port of the lithium battery pack.

The VM port of the IC1 is subjected to sampling voltage limiting control, the VM port of an original lithium battery protection board is connected to P-or CH-through M1 and RVM, and is used for closing a CO port when a lithium battery is fully charged, closing a DO port when electric quantity is exhausted, and locking a feedback detection port for charging or discharging overcurrent protection, the negative pressure between the port and the lithium battery in a charging termination state is smaller than 20V, and the protection board can be damaged due to excessive pressure difference; solar panels and wind power generation cannot directly charge the lithium battery pack, and the lithium battery pack can be safely charged only by an external voltage stabilizer; according to the invention, the 24V lithium battery pack can be connected with 80V charging equipment, and the 48V lithium battery pack can be connected with 100V charging equipment, so that the characteristic of wide voltage application range is achieved, and the damage caused by wrong connection of the charging equipment is avoided;

the RVM end is connected with CH-through R110, G104, and is connected with CH + through D107, D109 at the same time, when the charging equipment is connected, the current is switched on from CH +, D109, R111, G104, CH-, G104 field effect tube part, the RVM is connected with CH-through R110, G104, the VM port is in the charger and load detection state, because D109, D107, R110 are connected between CH +, CH-after connecting in series, the selected D107 voltage stabilization value is slightly higher than the maximum voltage of the lithium battery pack, the VM port voltage clamp is near zero potential, when the charging is terminated, the charging voltage of the overvoltage is divided by R110, and the VM port negative voltage can be controlled in single digit; when the charger is removed, the RVM port is separated from the CH, the RVM port is connected with the P-through the C100, the VM port works in an overcurrent protection locking and discharging termination detection state, the RVM port is connected with the D108 to the lithium battery V5, after the lithium battery terminates discharging, the voltage added to the drain electrode of the T100 is the total voltage of the lithium battery pack, the VM works near the voltage of the V5 through the voltage clamping of the C100 and the D108, and the circuit is more meaningful in the application of the lithium battery pack with more than 48V, so that the lithium battery protection board works more stably and reliably.

The low-voltage control switch circuit of the utility model comprises a DO output end of a lithium battery control chip IC1 connected with a resistor RDO, and a switch KG1 is connected in series between the grids of a discharge switch field-effect tube T100 at the other end of the resistor RDO; and a voltage converter is connected between the discharging anode port P + and the discharging cathode port P-, and the voltage converter is provided with 12V and 5V output ends.

The high-voltage control switch circuit comprises an inverter, the input end of the inverter is respectively connected with the positive electrode and the negative electrode of a lithium battery pack, the control end of the inverter is connected with the collector and the emitter of a triode of an optocoupler G100, the negative electrode of a diode of the optocoupler G100 is connected with a resistor R114, and the other end of the resistor R114 is connected with a discharging negative electrode port P-through a switch KG 2; the positive pole of the diode of the optocoupler G100 is connected with the drain electrode of the field effect transistor T105, the source electrode of the field effect transistor T105 is connected with the discharging positive pole port P +, and the grid electrode of the field effect transistor T105 is connected with the other end of the resistor R113 and is connected with the resistor RDO.

Charging example:

(1) And connecting the charging equipment under rated voltage and current: the low-voltage control switch KG1 is turned on or turned off, CO and DO output of the protection chip IC1 is high level under the condition that the lithium battery needs to be charged, CO firstly turns on T103 through R103, T103 turns on an optical coupler G102, G102 turns on T102, charging current passes through lithium batteries V10-V1, rsense, LK, D101 and CH from CH +, the charging current has about 1V voltage drop in D101, much heat is generated, the charging current can be damaged after long-time work and wastes electric energy, LK is a reed relay, a charging current magnetic field attracts a reed switch, the voltage of CO reaches the grid of T101 through D1 and the reed switch LK, T101 is turned on, and D101 is short-circuited; entering a high-efficiency normal charging state; the LK current coil portion may also be connected anywhere in the charging loop between T101 and T102 or between T102 and CH-; at the moment, the voltage of P + (CH +) forms current through R101, G101, D103, T102 and CH < - >, G101 is switched on, the voltage of DO is transmitted to a grid electrode of T100 through a triode in RDO and G101, and T100 is switched on; simultaneously, the charging indicator lamp D103 is lightened; when KG1 is in a charging state at the closing stage, G101 is turned on T100, the lithium battery also supplies power to the low-voltage output port P + and P-, and the voltage reduction circuit outputs low-voltage 12V and USB5V voltages for low-voltage illumination and mobile phone charging; when the charging is completed, the P + and P-voltage outputs are also closed under the condition that the KG1 is turned off;

(2) When the lithium battery is charged to the rated voltage and the protection board performs intermittent floating charge control, the voltage of the charging equipment can rise to the highest voltage of the charging equipment, an overvoltage protection circuit consisting of D109, R107, R108, R109, D106, T104 and G103 detects overvoltage, G103 is switched on to short circuit two poles of a grid source of T103, T103 is switched off, G102 is switched off at the same time, T102 is switched off, charging is stopped, and a charging indicator lamp D103 is switched off; the detection voltage of the IC1 VM port charger can be kept in a safe range, the charging mode can be fully charged, and floating charging cannot be carried out, because the highest peak voltage of the frequent switches T101 and T102 and the charging equipment under high voltage can be connected in series into the buck converter and the inverter to be damaged during floating charging; if the wind power or sunlight weakening voltage drops below the protection voltage, the charging is started again;

(3) The connection voltage and the current exceed rated values: during early charging, the voltage of the lithium battery can be reduced to the real-time voltage of the lithium battery, the process is similar to that expressed in the formula (1), but the charging current can exceed the rated current in a short time, the voltage drop detected by the current detection resistor Rsense is transmitted to VIN of the IC1 to turn off CO output voltage and turn off the charging current, at the moment, the voltage of the charging current can rise to the highest voltage of the charging equipment, an overvoltage protection circuit composed of R107, R108, R109, D106, T104 and G103 turns on G103 to short circuit two poles of a grid source of the T103, the T103 is turned off, meanwhile, the G102 is turned off, the T102 is turned off, the charging is ended, the charging indicator lamp D105 is turned off, and the charging fails;

(4) When the charging current exceeds the rated value, the voltage drop detected by the current detection resistor Rsense is transmitted to VIN of the IC1 to turn off CO output voltage, turn off the charging current, start charging after time delay, and repeatedly circulate; meanwhile, the thermal protection NTC sensor is arranged near a current detection resistor Rsense, the temperature of the Rsense is increased by large-current charging, when the temperature reaches a certain temperature (about 75 ℃), the IC1 cuts off CO output voltage, T103 and T102 are cut off, charging is stopped, and charging is restarted after the temperature is reduced a little, so that average current is charged near rated current until the lithium battery is fully charged;

(5) When the positive and negative of the charging equipment are connected reversely, the D101, the D103, the D104 and the D109 can block the charging equipment from transmitting current to the control circuit, the T101 cannot be opened and cannot be charged, the resistance value of the R109 is relatively large, and an overvoltage protection circuit formed by the R108, the R109, the R110, the D106, the T104 and the G103 cannot be damaged after the charging is connected reversely, so that the system is not damaged; the general energy storage power supply T101 only uses one diode, can play the protection of the reverse connection, but there is a great voltage drop under the charging state, heat much, the inefficiency, the invention uses a field effect tube, namely the field effect tube of the combination of T101 and D101, and a reed relay LK, have solved the low loss of the protection of the reverse connection, D101 blocks the reverse current when the reverse connection, can open T101 to make it voltage drop very low, heat very little, the high efficiency when charging;

(6) And when the charging port is short-circuited, the CH + and the CH-have no current, and the process is similar to the process in the step (5).

And (3) discharge control:

1. a switch KG1 is connected in series between a DO output end of a lithium battery control chip IC1 and a grid electrode of a discharge switch field effect transistor T100 through RDO, so that low-voltage output of a lithium battery can be controlled, KG1 is closed, T100 is switched on, the lithium battery supplies power to a low-voltage output port P + and a low-voltage output port P-, voltage and electric quantity display current data, a voltage reduction circuit outputs low-voltage 12V and USB5V voltages, and low-voltage illumination and mobile phone charging are achieved.

2. The lithium battery can obtain 220V alternating current through the boosting and inversion of the inverter, the input current of the inverter is large, the inverter is generally not connected with a lithium battery through a protective plate, a control circuit of the inverter is connected with a low-voltage output port through an optocoupler G100, when an IC1DO port outputs high level, R116 fully charges C101 and then turns on T106, KG2 is turned on under the condition that KG1 is turned on, the lithium battery P + forms current through T106, D111, G100, R117, KG2 and P-, and the triode of G100 turns on the inverter to output 220V alternating current; when the electric quantity of the lithium battery is exhausted, the output of the DO port of the lithium battery control chip BM3514 is at a zero level, T100 is turned off, G100 current is cut off, and an internal circuit of the inverter stops working.

The utility model adopts the charging control circuit composed of the isolation control charging switch circuit, the lossless reverse connection protection circuit, the overvoltage protection circuit and the port sampling voltage limiting control circuit, and the charging control part can protect the safety of the energy storage power supply in a certain range under the complex environment; meanwhile, a low-voltage control switch of the discharge control circuit is added, 12V low-voltage output and UBS mobile phone charging output can be turned on, and a high-voltage control switch of the discharge control circuit turns on 220V alternating current output; the utility model has the advantages of wide voltage application range, simple structure, low cost, high reliability, convenient maintenance, and obvious advantages in the aspects of cost control, after-sale service and the like.

Claims

1. The utility model provides a control circuit of lithium cell energy storage power which characterized in that: the lithium battery protection board is provided with a charging positive terminal CH +, a charging negative terminal CH-, a discharging positive terminal P + and a discharging negative terminal P-, the discharging positive terminal P + is connected with the positive terminal of the lithium battery pack, a discharging switch composed of a field effect tube T100 and a diode D100 is connected between the negative terminal and the P-terminal of the lithium battery pack, a charging control circuit and a discharging control circuit are also connected between the lithium battery protection board and the charging positive terminal CH + and the charging negative terminal CH-, and the charging control circuit comprises an isolation control charging switch circuit, a lossless reverse connection protection circuit, an overvoltage protection circuit and an IC sampling port voltage limiting control circuit; the discharge control circuit comprises a low-voltage control switch circuit and a high-voltage control switch circuit.

2. The control circuit of a lithium battery energy storage power supply of claim 1, wherein: the isolation control charging switch circuit comprises a CO port of a lithium-ion protection chip IC1, a grid electrode of a field-effect tube T103, a drain electrode of the field-effect tube T103 is connected with a negative electrode of an optocoupler G102 light-emitting diode, an anode of the optocoupler G102 light-emitting diode and a resistor R104, the resistor R104 is connected with an emitter of an optocoupler G101 light-emitting triode, a collector electrode of the optocoupler G101 light-emitting triode is connected with a negative electrode D109, an anode D109 is connected with a charging input port CH +, and a source electrode of the field-effect tube T103 is connected with a zero potential end of a lithium battery pack; d109 negative pole connecting resistance R105 simultaneously, the collecting electrode of opto-coupler G102 triode is connected to the resistance R105 other end, diode D104's positive pole is connected to the projecting pole of G102 triode, diode D105 is connected respectively to diode D104's negative pole, the grid of resistance 106 and field effect transistor T102, charging negative input end CH is connected to the other end of voltage regulator D105 and resistance 106, charging positive input end CH + connecting port P +, diode D102 positive pole and charging negative input end CH are connected respectively to field effect transistor T102's source electrode, field effect transistor T101 and diode D101 constitute charging switch is connected to field effect transistor T101 and diode D101's drain electrode, the charging switch other end is constituteed through LK's current coil connecting current detection resistance Rsense to field effect transistor T101 and diode D101, current detection resistance Rsense's the other end is connected with lithium cell group zero potential end.

3. The control circuit of a lithium battery energy storage power supply of claim 1, wherein: the lossless reverse connection protection circuit comprises a field effect transistor T101, a correlation resistor R102 is arranged between a grid electrode and a drain electrode, the grid electrode of the T101 is also connected with one end of a reed switch LK, meanwhile, the other control end of the reed switch LK is connected with the negative electrode of a diode D1, and the positive electrode of the diode D1 is connected with a CO port of a lithium battery protection chip IC 1.

4. The control circuit of a lithium battery energy storage power supply of claim 1, wherein: the overvoltage protection circuit comprises a diode D109, a resistor R108, a voltage regulator tube D106 and a resistor R107 between a charging positive input end CH + and a charging negative input end CH-, wherein the charging positive input end CH + is connected with the anode of the diode D109, the cathode of the diode D109 is respectively connected with the resistor R108 and the resistor R109, the other end of the resistor R108 is connected with the voltage regulator tube D106, the other end of the resistor R109 is connected with the anode of a diode of an optocoupler G103, the cathode of the diode of the optocoupler G103 is connected with the collector of a triode T104, the other end of the voltage regulator tube D106 is respectively connected with the base of the triode T104 and the resistor R107, the emitter of the triode T104 and the other end of the resistor R107 are connected with the charging negative input end CH-, the emitter of the triode G103 is connected with the source of a field effect tube T103, and the collector of the triode of the optocoupler G103 is connected with the grid of the field effect tube T103.

5. The control circuit of a lithium battery energy storage power supply of claim 1, wherein: the IC sampling port voltage-limiting control circuit is characterized in that the sampling port is arranged at a source electrode of a field effect transistor M1 connected with a lithium-ion protection chip IC1 VM port, a resistor RVM of a drain electrode of the field effect transistor M1 is connected with a resistor R110, the other end of the resistor R110 is connected with a source electrode of an optocoupler G104 field effect transistor, the other source electrode of the optocoupler G104 field effect transistor is connected with a charging negative input end CH-, meanwhile, the resistor RVM is also connected with a voltage-stabilizing tube D107, the other end of the voltage-stabilizing tube D107 is connected with one end of a resistor R111 and the negative electrode of a diode D109, the other end of the resistor R111 is connected with the positive electrode of the optocoupler G104 diode, the negative electrode of the optocoupler G104 diode is connected with the positive electrode of the optocoupler G101 diode, and the negative electrode of the optocoupler G101 diode is connected with the CH-end; in addition, the resistor RVM is also connected with R101, C100, D108 and R101 to be connected with a zero potential end of the lithium battery pack, the C100 is connected with a P-end, and the D108 is connected with a V5 port of the lithium battery pack.

6. The control circuit of a lithium battery energy storage power supply of claim 1, wherein: the low-voltage control switch circuit comprises a DO output end of a lithium battery control chip IC1, a resistor RDO, a discharge switch field-effect tube T100 and a switch KG1, wherein the switch RDO is connected between the grid electrodes of the discharge switch field-effect tube T100 at the other end of the resistor RDO in series; and a voltage converter is connected between the discharging anode port P + and the discharging cathode port P-, and the voltage converter is provided with 12V and 5V output ends.

7. The control circuit of a lithium battery energy storage power supply of claim 6, wherein: the high-voltage control switch circuit comprises an inverter, wherein the input end of the inverter is respectively connected with the positive electrode and the negative electrode of a lithium battery pack, the control end of the inverter is connected with the collector and the emitter of an optocoupler G100 triode, the negative electrode of an optocoupler G100 diode is connected with a resistor R114, and the other end of the resistor R114 is connected with a discharging negative electrode port P & lt- & gt through a switch KG 2; the positive pole of optocoupler G100 diode is connected with the drain electrode of field effect transistor T105, the source electrode of field effect transistor T105 is connected with the positive discharge port P +, the grid electrode of field effect transistor T105 is connected with resistor R113, and the other end of resistor R113 is connected with resistor RDO.