CN201210622Y - Electric core charging and discharging control management circuit for lithium ion or polymer battery - Google Patents

Abstract

The utility model discloses an electric core control and management circuit of a lithium ion or polymer battery, which comprises more than two electric cores, a protection circuit connected to the electric core, a charging circuit and a single-chip microcomputer control circuit, and the electric core is also connected with the charging and discharging management circuit. The switching circuit is connected, and the charging and discharging management switching circuit is also connected with the protection circuit and the single-chip microcomputer control circuit. The charging and discharging management switching circuit can realize the working mode of serial discharging and parallel charging of multiple cells. The utility model uses a single-chip microcomputer combined with a simple hardware circuit to realize the phase switching control management of multi-cell series discharge and multi-cell parallel charging, which can greatly reduce the charging voltage of multi-cell charging and save other costs. The connection resources of low-voltage charging expand the application range and have the characteristics of charging management function. The utility model has the advantages of complete functions, simple structure, low power consumption, high reliability and low cost.

Description

A charge and discharge control management circuit for a lithium-ion or polymer battery cell

technical field

The utility model relates to a lithium ion or polymer battery, in particular to a charging and discharging control management circuit for a lithium ion or polymer battery.

Background technique

With the gradual increase of various mobile electronic devices, some related electronic devices that require multiple strings of lithium-ion/polymer series power supply are also gradually increasing, especially the popularity of lithium-ion/polymer batteries has accelerated this development process. However, with the increase in the number of battery cells in series, the charging voltage of some charging adapters needs to be continuously increased, which narrows the scope of application of some chargers, and even cannot be adapted. The same problem applies to mobile devices. How to use a low-voltage power supply to reliably charge a high-voltage lithium/polymer battery formed by connecting multiple cells in series? The current conventional practice is to add charging terminals to the charging power source and the battery pack at the same time, and charge the batteries independently. This approach increases the number of terminals, which is not allowed in many systems with only two power supply ports. It also adds difficulties to the design of protection circuits and charging power sources. The overall waste of resources is more, and the products are increasingly miniaturized. bring disadvantages.

Chinese Patent No. ZL03243156.2 discloses a rechargeable battery unit and battery pack with controllable connection state and Chinese Patent No. ZL03243159.7 discloses a rechargeable battery unit and battery with controllable connection state. A technical solution for solving the problem of charging multiple battery cells.

The Chinese patent number is ZL 03146990.6 which discloses a charging protection circuit for a lithium battery. The charging protection circuit for each cell in the battery includes the main control chip IC1 and its peripheral circuits. The peripheral circuits of the IC1 chip include MOS tubes Q2 and Q3 that act as switches. Resistors R3, R4 and capacitor C1, the balancing capacitor C1 is connected in parallel to the VSS terminal and VDD terminal of the chip IC1, the balanced MOS transistor Q1 is connected to the CO terminal of the IC1 chip and the MOS transistor Q3, and the resistor R1 is connected in parallel with the battery cell Connected to the power circuit, one pole of the power supply in the unit circuit is connected to the opposite pole of the power supply in the next unit circuit, and so on. This technical solution only solves the technical problem of series operation of multiple single-cell battery charging protection circuits.

Utility model content

The technical problem to be solved by the utility model is to provide a battery charge and discharge control management circuit for a lithium-ion or polymer battery that shares a charging and discharging port, can automatically switch all battery cells to discharge in series, and charge every two cells in parallel.

According to the above purpose, a battery charge and discharge control management circuit of a lithium ion or polymer battery has been designed, including more than two battery cells, a protection circuit connected to the battery cell, a charging circuit and a single-chip microcomputer control circuit, and the protection circuit is respectively connected to a The electric core or two or more electric core groups are connected, and the feature is that: the electric core or electric core group is also connected with the charge and discharge management switching circuit, and the charge and discharge management switching circuit is also connected with the protection circuit and the single-chip microcomputer control circuit connect. The charge and discharge management switching circuit includes a series switch circuit for realizing series discharge, a parallel switch circuit for parallel charge, and a delay circuit connected with the series switch circuit and the parallel switch circuit.

As the preferred solution of the utility model is: the series switch circuit includes MOS tube N3, MOS tube N5, pull-up resistor R7, resistors R8, R9, switch delay capacitor C5 and capacitor C6, pull-up resistor R7, switch delay Capacitor C5, resistor R9, and capacitor C6 form two sets of RC delay circuits. The source of MOS transistor N3 is connected to the cell protection circuit, the drain of N3 is connected to the positive end of the cell of another cell group, and the gate of N3 The pole is connected with the pull-up resistor R7, the switch delay capacitor C5 and the drain of the MOS transistor N5, the source of N5 is connected with another group of cell protection circuit, the gate of N5 is connected with the resistor R9 and the capacitor C6 and connected with the resistor R8 The S-SWITCH control terminal of the single-chip microcomputer control circuit is connected.

The parallel switch circuit includes MOS transistors N4, resistors R10, R11 and capacitor C7, the drain of N4 is connected with the protection circuit of one group of batteries, the source of N4 is connected with the protection circuit of another group of batteries, and the drain of N4 is connected with the protection circuit of another group of batteries. A resistor R10 and a capacitor C7 are connected between the gate and the source, and the gate of N4 is connected to the P-SWITCH control terminal of the single-chip microcomputer control circuit through the resistor R11.

The single-chip microcomputer control circuit includes a single-chip microcomputer U3, and 3 and 5 pins of U3 are respectively connected with the series switch circuit and the parallel switch circuit through the S-SWITCH control terminal and the P-SWITCH control terminal, and the 6 pins of U3 are connected with the charging circuit through the PWM terminal , pins 9 and 10 of U3 are connected to the ambient temperature detection circuit, pin 11 of U3 is connected to the charging input voltage detection circuit through the DC_AD terminal, and pin 12 of U3 is connected to the cell voltage detection circuit through the BV_AD terminal.

The charging input voltage detection circuit includes triodes Q4, Q6, Q7, field effect transistor N7, resistors R32-R37, the collector and emitter of Q4 are connected in series in the charging main circuit, the collector of Q4 is connected to the ambient temperature detection circuit Connect, the emitter of Q4 is connected with the charging terminal P+, the base of Q4 is connected with the drain of field effect transistor N7 through the resistor R33, the source of N7 is grounded, the gate of N7 is connected with the collector of the triode Q6 through the resistor R34, The emitter of Q6 is connected to the charging terminal P+ via the resistor R36, the base of Q6 is connected to the base of the triode Q7, and the emitter of Q7 is connected to the B3+ terminal.

The ambient temperature detection circuit includes triode Q1, thyristor U4, thermistor NTC1, resistors R21-R25, the collector of Q1 is connected to the collector of Q4, the emitter of Q1 is connected to one end of thermistor NTC1 and the microcontroller U3 is connected, the base of Q1 is connected to the thyristor and then grounded, the trigger pole of the thyristor is connected to the 9-pin of the single-chip microcomputer U3, and the other end of the thermistor NTC1 is connected to the 10-pin of the single-chip microcomputer U3.

The charging circuit includes a PWM step-down charging circuit and a PWM pulse width adjustment circuit, the PWM step-down charging circuit is composed of field effect transistors N8, N9, diode D1, and inductor L1, and the PWM pulse width adjustment circuit includes triodes Q2, Q3, Q5 , the PWM step-down charging circuit and the PWM pulse width regulation circuit are existing mature circuits, and the PWM step-down charging circuit is also connected with the cell voltage detection circuit.

The cell voltage detection circuit includes a field effect transistor N6, a resistor R16, and a capacitor C10. The source of N6 is connected to the pin 12 of the single-chip microcomputer U3 through the BV_AD end, and the resistor R16 and the capacitor C10 form an RC delay circuit. The RC delay The circuit is connected to the source of N6, the drain of N6 is connected to the charging circuit, and the gate of N6 is connected to the DC1 terminal through the resistor R17.

As a further improvement of the utility model is: the protection circuit includes protection chips U1, U2, double MOS transistors N1, N2, the protection chip U1 is connected to the battery cells CELL1 and CELL2, the battery cells CELL1 and CELL2 are connected in series, and the protection chip U2 is connected to the The battery cells CELL3 and CELL4 are connected, the double MOS transistor N1 is connected to the negative pole of the protection chip U1 and the battery cell CELL2, and the double MOS transistor N2 is connected to the protection chip U2 and the negative pole of the battery cell CELL4.

Compared with the prior art, the utility model has the following remarkable effects:

1. The battery cells of the utility model are connected with relatively independent protection circuits, and the protection chip in the protection circuit cooperates with the double MOS tubes that act as switches to protect the battery cells from overcharging and overdischarging;

2. The series-parallel relationship switching circuit of the present invention is composed of a series switch circuit and a parallel switch circuit, so the switching between series discharge and parallel charge is flexible and reliable;

3. Under the premise of ensuring that all batteries can be safely charged and discharged, the utility model uses a single-chip microcomputer combined with a simple hardware circuit (MOS tube) in the circuit to achieve multi-cell series discharge and multi-power saving. Cell parallel charging phase switching control management can greatly reduce the charging voltage of multi-cell charging, save other low-voltage charging connection resources, expand the application range and have the characteristics of charging management function.

4. The utility model has the advantages of complete functions, simple structure, low power consumption, high reliability and low cost.

Description of drawings

Fig. 1 is a schematic block diagram of the utility model;

Fig. 2 is a circuit diagram of Embodiment 1 of the present utility model.

Detailed ways

In order to facilitate the understanding of those skilled in the art, the structural principle of the present utility model will be further described in detail below in conjunction with specific embodiments and accompanying drawings:

As shown in Figure 1, the utility model lithium ion or polymer battery cell management circuit principle block diagram, the battery is composed of more than two cells, the protection circuit is connected with one cell or a group of cells to protect each cell Battery overcharge and overdischarge, etc. The battery and the protection circuit are also connected with a series switch circuit for realizing the series discharge of all batteries and a parallel switch circuit for realizing parallel charging of every two batteries, and the series switch circuit and the parallel switch circuit are also connected with the delay circuit. The battery realizes a shared charging and discharging port through the charging and discharging terminals in the charging circuit, and the charging circuit is controlled by a single-chip microcomputer control circuit, and a charging input voltage detection circuit and an ambient temperature detection circuit are also connected between the charging circuit and the single-chip microcomputer control circuit. A cell voltage detection circuit is also connected before the battery and the single-chip microcomputer control circuit.

Accompanying drawing 2 is embodiment 1 of the present utility model, and this embodiment is the charging and discharging management circuit of 4 batteries, can realize the serial discharge of 4 batteries and the parallel charging of every two batteries.

As shown in Figure 2, a lithium battery cell control and management circuit with a new charging and discharging method includes a single-chip microcomputer control circuit composed of a single-chip microcomputer U3, and pins 3 and 5 of the single-chip microcomputer U3 pass through the S-SWITCH control terminal and the P-SWITCH control terminal. Connect with the series switch circuit and the parallel switch circuit respectively, the 6 pins of U3 are connected with the charging circuit through the PWM terminal, the 9 and 10 pins of U3 are connected with the ambient temperature detection circuit, the 11 pins of U3 are connected with the charging input voltage detection circuit through the DC_AD terminal , Pin 12 of U3 is connected to the battery voltage detection circuit through the BV_AD terminal.

The cell protection circuit of the battery includes protection chips U1, U2, dual MOS tubes N1, N2, resistors R1, R2, R3, R4, R5, R6, capacitors C1, C2, C3, C4, and pin 5 of the protection chip U1 (VDD ) is connected to the positive pole of the cell CELL1 through the resistor R1, the cells CELL1 and CELL2 are connected in series, and the connection point of the cell CELL1 and CELL2 is connected with the resistor R2, the capacitor C2 and the 4 pin (VC) of U1, and the 1 (DO) of U1 , 2 (CO) pins are respectively connected with pins 4 and 5 of the double MOS tube N1, the negative pole of the cell CELL2 is connected with pins 2 and 3 of N1, pins 6 and 7 of N1 and pin 3 of U1 are connected with the series switch circuit; Pin 5 (VDD) of the protection chip U2 is connected to the positive pole of the battery cell CELL3 through the resistor R3, the positive pole of the battery cell CELL3 is also connected to the series switch circuit, the battery cells CELL3 and CELL4 are connected in series, and the connection point of the battery cell CELL3 and CELL4 is connected to the resistor R4, capacitor C4 and pin 4 (VC) of U2 are connected, pins 1 (DO) and 2 (CO) of U2 are respectively connected to pins 4 and 5 of double MOS transistor N2, and the negative pole of cell CELL4 is connected to pins 2 and 3 of N2. The pins are connected, and the 6 and 7 pins of N2 and the 3 pins of U2 are connected with the series switch circuit, the parallel switch circuit and the delay circuit.

The series switch circuit includes MOS transistor N3, MOS transistor N5, pull-up resistor R7, resistors R8, R9, switch delay capacitor C5 and capacitor C6, pull-up resistor R7, switch delay capacitor C5 and resistor R9, capacitor C6 Two sets of RC delay circuits are formed, the source of MOS transistor N3 is connected to pin 3 (VM) of U1, pins 6 and 7 of dual MOS transistor N1, the drain of N3 is connected to the positive end of cell CELL3, and the gate of N3 The pole is connected with the pull-up resistor R7, the switching delay capacitor C5 and the drain of the MOS transistor N5, the source of N5 is connected with pins 6 and 7 of the double MOS transistor N2, the gate of N5 is connected with the resistor R9 and the capacitor C6 and passed through the resistor R8 is connected with the S-SWITCH control terminal of the single-chip microcomputer control circuit.

The parallel switch circuit includes a MOS transistor N4, resistors R10, R11 and a capacitor C7, the drain of N4 is connected to pins 6 and 7 of the double MOS transistor N1, and the source of N4 is connected to pins 6 and 7 of the double MOS transistor N2 A resistor R10 and a capacitor C7 are connected between the gate and source of N4, and the gate of N4 is connected to the P-SWITCH control terminal of the single-chip microcomputer control circuit through the resistor R11.

The charging input voltage detection circuit includes triodes Q4, Q6, Q7, field effect transistor N7, resistors R32-R37, the collector and emitter of Q4 are connected in series in the charging main circuit, the collector of Q4 is connected to the ambient temperature detection circuit Connect, the emitter of Q4 is connected with the charging terminal P+, the base of Q4 is connected with the drain of field effect transistor N7 through the resistor R33, the source of N7 is grounded, the gate of N7 is connected with the collector of the triode Q6 through the resistor R34, The emitter of Q6 is connected to the charging terminal P+ via the resistor R36, the base of Q6 is connected to the base of the triode Q7, and the emitter of Q7 is connected to the B3+ terminal.

The ambient temperature detection circuit includes triode Q1, thyristor U4, thermistor NTC1, resistors R21-R25, the collector of Q1 is connected to the collector of Q4, the emitter of Q1 is connected to one end of thermistor NTC1 and the microcontroller U3 is connected, the base of Q1 is connected to the thyristor and then grounded, the trigger pole of the thyristor is connected to the 9-pin of the single-chip microcomputer U3, and the other end of the thermistor NTC1 is connected to the 10-pin of the single-chip microcomputer U3.

The charging circuit includes a PWM step-down charging circuit and a PWM pulse width adjustment circuit, the PWM step-down charging circuit is composed of field effect transistors N8, N9, diode D1, and inductor L1, and the PWM pulse width adjustment circuit includes triodes Q2, Q3, Q5 , the PWM step-down charging circuit and the PWM pulse width regulation circuit are existing mature circuits, and the PWM step-down charging circuit is also connected with the cell voltage detection circuit.

The cell voltage detection circuit includes a field effect transistor N6, a resistor R16, and a capacitor C10. The source of N6 is connected to the pin 12 of the single-chip microcomputer U3 through the BV_AD end, and the resistor R16 and the capacitor C10 form an RC delay circuit. The RC delay The circuit is connected to the source of N6, the drain of N6 is connected to the charging circuit, and the gate of N6 is connected to the DC1 terminal through the resistor R17.

The working principle of the utility model is: when the circuit is in a non-charging state, the batteries CELL1 and CELL2 are connected with the batteries CELL3 and CELL4 through the MOS tubes N1 and N3, and the external circuit can be discharged in series with 4 batteries. In the charging state of the circuit, the cells CELL1 and CELL2 switch to the parallel mode with independent protection circuits for every two cells of the cells CELL3 and CELL4 through the MOS transistors N1 and N4 and charge them. The series-parallel relationship phase switching is realized by turning off the MOS transistor N3 and turning on the MOS transistor N4 to realize the series connection of the battery cells CELL1, CELL2 and the battery cells CELL3 and CELL4 through the relevant independent protection circuit; through the opening of the MOS transistor N3 and the MOS Turn off the tube N4 to realize the parallel connection of the cells CELL1, CELL2 and the cells CELL3, CELL4 through the relevant independent protection circuit. Cells CELL1, CELL2 and cells CELL3, CELL4 are directly connected in series respectively. Cells CELL1 and CELL2 are connected to the source terminal of one of the N-type dual MOS tubes N1 through the negative terminal of the battery cell CELL2, and then connected to the source terminal of the N-type MOS tube N3 through the source terminal of the other tube in N1, and then through N3 The drain terminal of the battery is connected to the positive terminal of the cell CELL3. In the middle of the four cells formed in this way, there is a series connection method for controlling the isolation of the MOS transistors N1 and N3. The cells CELL1 and CELL2 are connected to the terminal of the diode D2 through the positive terminal of the cell CELL1, the positive terminal of the cell CELL3 is connected to the negative terminal of the diode D3, and the cells CELL1 and CELL2 are connected to the N-type dual MOS through the negative terminal of the cell 2 The source terminal of one tube in the tube N3 is connected to the drain terminal of the N-type MOS transistor N4 through the source terminal of the other tube, and the drain terminal of N4 is connected to the negative terminal of the cell 4 through N2. Between every two cells formed in this way, there is a parallel connection mode in which the control MOS transistors N1, N2, N4 (negative terminals) and diodes D2, D3 (positive terminals) are isolated.

The relevant delay mode of the circuit automatically switching the series-parallel relationship of the batteries is realized through three delay switch circuits, the pull-up resistor R7 and the switch delay capacitor C5, the resistor R9 and the capacitor C6, and the resistor R10 and the capacitor C7. Three relatively independent RC delay circuits are connected to the MOS transistor N5 through the pull-up resistor R7, so that N5 is connected to the delay circuit of the resistor R10 and the capacitor C7. The cooperation of the three delay circuits realizes reliable automatic Switch the series-parallel relationship of the cells.

In the normal pure discharge process of the utility model, the single-chip microcomputer U3 stops working, and it controls the level of the series-parallel switching control ports P-SWITCH and S-SWITCH of the 4 cells to remain low. Under this condition, the VGS voltages of the MOS transistors N4 and N5 are both at low level, so that these two MOS transistors are in the off state. At this time, the VGS voltage of the MOS transistor N3 is pulled up to a high level through the resistor R7, so that the MOS transistor N3 is turned on, and N3 couples the negative pole of the battery cell 2 to the positive terminal of the battery cell 3 through the MOS transistor N1 and the MOS transistor. The discharge circuit forms a series connection mode of cells 1 to 4. In this way, the cells connected in series can realize normal discharge to the external system through P+ and P-. During the discharge process, as long as the protection IC: U1 or U2 detects that any cell has reached the over-discharge protection voltage, the corresponding protection IC will send a low level at the DO terminal to control the switch MOS associated with this DO terminal. Turn off to realize the over-discharge protection function of the battery cell. Similarly, this circuit can also realize functions such as over-current and short-circuit protection, ensuring the protection of lithium-ion/polymer batteries.

The control and management process during normal charging, P+, P—connect to the charging power supply. The single-chip microcomputer U3 first switches the series mode of the 4 batteries to the parallel mode through the control ports P-SWITCH and S-SWITCH, and maintains this parallel mode during the entire charging process. The specific switching method is as follows: After the charging power supply is connected, the microcontroller starts to work, first outputs a high level through the S-SWITCH, and is coupled to the gate of the MOS transistor N5 through the resistor R8, and the VGS voltage of the MOS transistor N5 is at a high level. The lower turn-on pulls down the VGS voltage of the MOS transistor N3 to a low level, and the MOS transistor N3 turns from the on state to the off state, thus cutting off the series relationship formed by the cells 1 and 2 through the MOS transistor N3 and the cells 3 and 4 . During this period, the switching of the double MOS and the RC delay formed by the resistor R9 and the capacitor C6 are experienced. Cut off the series relationship of 4 batteries, then the microcontroller outputs a high level through the P-SWITCH control port, and is coupled to the gate of the MOS transistor N4 through the resistor R11, and the MOS transistor N4 is turned on when the VGS voltage is high. The negative terminal of the battery cell 2 is connected to the source of the charging MOS transistor of the MOS transistor N2 through the conduction of the MOS transistor N1 and the MOS transistor N3. Realize the parallel connection of two groups of batteries, which are a group of batteries 1 and 2 and batteries 3 and 4, after passing through the protection circuit. Then, the single-chip microcomputer completes the detection of the charging input voltage, ambient temperature, and two sets of battery cell voltages through the DC_AD, TH_AD, and BV_AD ports respectively. If the charging conditions are allowed to be complete, the single-chip microcomputer controls the totem pole driving circuit composed of transistors Q2 and Q3 to drive the switch MOS transistor N8 through the PWM port through the buffer of the transistor Q1. Through the step-down output formed by MOS transistor N8, inductor L1, diode D4, etc., from the inductor L1 through diodes D2 and D3, the battery group composed of cells 1 and 2 and the cell group composed of cells 3 and 4 are respectively connected. The group is charged with constant current and constant voltage.

On the whole, the protection part of the utility model is mainly composed of two protection ICs: U1, U2, U1, U2 are respectively responsible for protecting the overcharging, over-discharging and over- Current and short circuit protection. MOS transistors N1 and N2 play the role of main circuit switch control. Under the premise of ensuring that all batteries can be safely charged and discharged, and adding a small amount of components to its external circuit, it can realize the automatic switching function of discharging four batteries in series and charging two batteries. This connection method is simple, reliable and low in cost.

Any idea according to the utility model, whether it includes the charging management function or does not include the charging tube function or increases the number of battery cells, is within the protection scope of the utility model.

Claims (10)

1, the electric core of a kind of lithium ion or polymer battery discharges and recharges the control and management circuit; comprise the above electric core of two joints; the protective circuit, charging circuit and the single chip machine controlling circuit that are connected with electric core; protective circuit connects with an electric core or the electric core group more than two respectively; it is characterized in that: described electric core or electric core group also connect with the management of charging and discharging commutation circuit, and described management of charging and discharging commutation circuit also connects with protective circuit and single chip machine controlling circuit.

2, the electric core of lithium ion according to claim 1 or polymer battery discharges and recharges the control and management circuit, it is characterized in that: described management of charging and discharging commutation circuit comprises the tandem tap circuit of realizing discharged in series and the parallel control loop of realizing charged in parallel, and the delay circuit that connects with tandem tap circuit and parallel control loop.

3; the electric core of lithium ion according to claim 2 or polymer battery discharges and recharges the control and management circuit; it is characterized in that: described tandem tap circuit comprises metal-oxide-semiconductor N3; metal-oxide-semiconductor N5; pull-up resistor R7; resistance R 8; R9; switch delay capacitor C5 and capacitor C 6; pull-up resistor R7; switch delay capacitor C5 and resistance R 9; capacitor C 6 is formed two groups of RC delay circuits; the source electrode of metal-oxide-semiconductor N3 connects with electric core protective circuit; the drain electrode of N3 connects with the positive terminal of the electric core of another electric core group; the grid of N3 and pull-up resistor R7; the drain electrode of switch delay capacitor C5 and metal-oxide-semiconductor N5 connects; the source electrode of N5 is organized electric core protective circuit with another and is connected, and the grid connection electrical resistance R9 of N5 and capacitor C 6 also connect with the S-SWITCH control end of single chip machine controlling circuit by resistance R 8.

4, the electric core according to claim 2 or 3 described lithium ions or polymer battery discharges and recharges the control and management circuit; it is characterized in that: described parallel control loop comprises metal-oxide-semiconductor N4, resistance R 10, R11 and capacitor C 7; the drain electrode of N4 connects with the protective circuit of one group of electricity core; the source electrode of N4 connects with another protective circuit of organizing electric core; be connected with resistance R 10 and capacitor C 7 between the grid of N4 and the source electrode, the grid of N4 connects with the P-SWITCH control end of single chip machine controlling circuit by resistance R 11.

5, the electric core of lithium ion according to claim 4 or polymer battery discharges and recharges the control and management circuit, it is characterized in that: described single chip machine controlling circuit comprises single-chip microcomputer U3,3 of U3,5 pin connect with tandem tap circuit and parallel control loop respectively by S-SWITCH control end and P-SWITCH control end, 6 pin of U3 connect with charging circuit by the PWM end, 9 of U3,10 pin connect with ambient temperature detection circuit, 11 pin of U3 connect with the charging input voltage detection circuit by the DC_AD end, and 12 pin of U3 connect with electric core voltage detecting circuit by the BV_AD end.

6, the electric core of lithium ion according to claim 5 or polymer battery discharges and recharges the control and management circuit, it is characterized in that: described charging input voltage detection circuit comprises triode Q4, Q6, Q7 and field effect transistor N7, resistance R 32～R37, the collector and emitter of Q4 is serially connected with in the charging major loop, the collector electrode of Q4 connects with ambient temperature detection circuit, the emitter of Q4 connects with charging end P+, the base stage of Q4 connects through the drain electrode of resistance R 33 with field effect transistor N7, the source ground of N7, the grid of N7 connects with the collector electrode of triode Q6 by resistance R 34, the emitter of Q6 connects with charging end P+ through resistance R 36, the base stage of Q6 connects with the base stage of triode Q7, and the emitter of Q7 connects with the B3+ end.

7, the electric core of lithium ion according to claim 6 or polymer battery discharges and recharges the control and management circuit, it is characterized in that: described ambient temperature detection circuit comprises triode Q1, controllable silicon U4, thermistor NTC1, resistance R 21～R25, the collector electrode of Q1 connects with the collector electrode of Q4, the emitter of Q1 connects with an end and the single-chip microcomputer U3 of thermistor NTC1, the base stage of Q1 connects back ground connection with controllable silicon, the silicon controlled trigger electrode connects with 9 pin of single-chip microcomputer U3, and the other end of thermistor NTC1 connects with 10 pin of single-chip microcomputer U3.

8, the electric core of lithium ion according to claim 5 or polymer battery discharges and recharges the control and management circuit, it is characterized in that: described charging circuit comprises PWM step-down charging circuit and pwm pulse adjustment circuit, PWM step-down charging circuit is made up of field effect transistor N8, N9, diode D1, inductance L 1, the pwm pulse adjustment circuit comprises triode Q2, Q3, Q5, PWM step-down charging circuit and pwm pulse adjustment circuit are existing ripe circuit, and PWM step-down charging circuit also connects with electric core voltage detecting circuit.

9, the electric core of lithium ion according to claim 8 or polymer battery discharges and recharges the control and management circuit, it is characterized in that: described electric core voltage detecting circuit comprises field effect transistor N6, resistance R 16, capacitor C 10, the source electrode of N6 connects with 12 pin of single-chip microcomputer U3 through the BV_AD end, resistance R 16 and capacitor C 10 are formed the RC delay circuit, this RC delay circuit connects with the source electrode of N6, the drain electrode of N6 is connected on the charging circuit, and the grid of N6 connects with the DC1 end through resistance R 17.

10, the electric core of lithium ion according to claim 4 or polymer battery discharges and recharges the control and management circuit; it is characterized in that: described protective circuit comprises protection chip U1, U2, two metal-oxide-semiconductor N1, N2; protection chip U1 connects with electric core CELL1, CELL2; electricity core CELL1, CELL2 serial connection; protection chip U2 connects with electric core CELL3, CELL4; two metal-oxide-semiconductor N1 connect with the negative pole of protection chip U1 and electric core CELL2, and two metal-oxide-semiconductor N2 connect with protection chip U2 and electric core CELL4 negative pole.

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