Battery charging management circuit

Abstract

The battery charging management circuit comprises a battery management circuit, a main control circuit and a voltage regulation circuit, a detection signal input end of the battery management circuit is used for detecting whether a battery exists in a battery management system or not, if yes, a battery detection signal is output, and an acquisition signal input end of the battery management circuit is used for receiving the battery detection signal and outputting a voltage regulation signal. The main control circuit is used for receiving a battery state acquisition signal and outputting a battery state acquisition signal, the main control circuit is used for outputting a charging control signal or a charging stopping control signal according to the battery state acquisition signal, and the voltage regulating circuit is used for executing a corresponding charging operation / charging stopping operation according to the charging control signal / charging stopping control signal. The battery state of the battery is collected, corresponding charging / charging stopping operation is executed through the voltage regulating circuit according to the battery state, the battery repairing function is achieved, and compatibility is high; and meanwhile, whether a battery is put into the battery management system or not can be detected, charging or discharging operation on an empty battery jar is prevented, and other safety risks such as short circuit are avoided.

Description

TECHNICAL FIELD

[0001] The utility model relates to battery charging management technical field especially relates to a battery charging management circuit.

BACKGROUND

[0002] In recent years, various portable electronic products develop rapidly, and as an important component of electronic products, batteries have also been rapidly developed and applied. Rechargeable batteries have characteristics such as charge-discharge cycle (i.e. can be repeatedly used) and small pollution (such as lithium batteries) and have become the first choice of portable electronic product power supply.

[0003] The existing battery management system can only charge a specific model of battery, so that the existing battery management system has limitations and does not have compatibility for commonly used types of rechargeable batteries on the market. At the same time, the maximum charging current is fixed and cannot be adjusted, so that the charging current and charging voltage cannot be adjusted according to the battery state of the rechargeable battery, causing the rechargeable battery to be easily damaged due to overcharging or overdischarging.

UTILITARY MODEL CONTENT

[0004] To solve the technical problem that the current battery management system can only charge a specific model of battery and cannot adjust the charging current and charging voltage, the utility model provides a battery charging management circuit.

[0005] The utility model is realized by the following technical schemes:

[0006] A battery charging management circuit, comprising a battery management circuit, a detection signal input end of the battery management circuit is used for detecting whether the battery management system has a battery, if so, a detection signal output end of the battery management circuit outputs a battery detection signal;

[0007] A collection signal input end of the battery management circuit is used for receiving the battery detection signal, and a collection signal output end of the battery management circuit is used for collecting the battery state and outputting a battery state collection signal;

[0008] A main control circuit, a control signal input end of the main control circuit is connected with the collection signal output end of the battery management circuit, a control signal output end of the main control circuit is connected with the controlled signal input end of the battery management circuit, and is used for outputting a charging control signal or a stop charging control signal according to the battery state collection signal;

[0009] A voltage regulating circuit, a signal input end of the voltage regulating circuit is connected with the controlled signal output end of the battery management circuit, and a signal output end of the voltage regulating circuit is used for executing a charging operation according to the charging control signal and executing a stop charging operation according to the stop charging control signal.

[0010] A battery charging management circuit as described above, the battery management circuit comprising:

[0011] A detection module, a signal input end of the detection module is connected with a positive electrode end of the battery, and a signal output end of the detection module is connected with a detection signal input end of the battery management circuit;

[0012] A first battery pack state acquisition module, a signal input end of the first battery pack state acquisition module is connected with a detection signal output end of the battery management circuit, and a signal output end of the first battery pack state acquisition module is used for outputting a first battery pack state acquisition signal according to the battery detection signal;

[0013] A second battery pack state acquisition module, a signal input end of the second battery pack state acquisition module is connected with a detection signal output end of the battery management circuit, and a signal output end of the second battery pack state acquisition module is used for outputting a second battery pack state acquisition signal according to the battery detection signal.

[0014] A battery charging management circuit as described above, the first battery pack state acquisition module comprises:

[0015] A first battery pack voltage acquisition unit, a signal input end of the first battery pack voltage acquisition unit is connected with a positive electrode end of a first battery pack, and a signal output end of the first battery pack voltage acquisition unit outputs a first battery pack voltage acquisition signal;

[0016] A first battery pack current acquisition unit, a signal input end of the first battery pack current acquisition unit is used for acquiring a charging current of the first battery pack, and a signal output end of the first battery pack current acquisition unit outputs a first battery pack charging current signal.

[0017] A battery charging management circuit as described above, the second battery pack state acquisition module comprises:

[0018] A second battery pack voltage acquisition unit, a signal input end of the second battery pack voltage acquisition unit is connected with a positive electrode end of a second battery pack, and a signal output end of the second battery pack voltage acquisition unit outputs a second battery pack voltage acquisition signal;

[0019] A second battery pack current acquisition unit, a signal input end of the second battery pack current acquisition unit is used for acquiring a charging current of the second battery pack, and a signal output end of the second battery pack current acquisition unit outputs a second battery pack charging current signal.

[0020] The battery charging management circuit as claimed in any one of the above, the first battery pack current collecting unit comprises a switch tube Q10, a resistor R15, a resistor R19 and a resistor RX1, a signal input end of the first battery pack current collecting unit is connected with a gate of the switch tube Q10 on one hand and connected with one end of the resistor R19 on the other hand, the other end of the resistor R19 is connected with the resistor RX1, the other end of the resistor RX1 is connected with a source of the switch tube Q10, a drain of the switch tube Q10 is connected with a negative terminal of the first battery pack on one hand and connected with one end of the resistor R15 on the other hand, the other end of the resistor R15 is connected with a signal output end of the first battery pack current collecting unit.

[0021] The battery charging management circuit as claimed in any one of the above, the second battery pack current collecting unit comprises a switch tube Q11, a resistor R20, a resistor R21, a resistor R23 and a resistor R24, a signal input end of the second battery pack current collecting unit is connected with one end of the resistor R21, the other end of the resistor R21 is connected with a gate of the switch tube Q11 on one hand and connected with one end of the resistor R23 on the other hand, the other end of the resistor R23 is connected with a source of the switch tube Q11, a drain of the switch tube Q11 is connected with a negative terminal of the second battery pack on one hand and connected with one end of the resistor R20 on the other hand, the other end of the resistor R20 is connected with a signal output end of the first battery pack current collecting unit.

[0022] The battery charging management circuit as claimed in any one of the above, the voltage regulating circuit comprises:

[0023] A first voltage regulating module, a signal input end of the first voltage regulating module is connected with a first battery pack controlled signal output end of the battery management circuit, a signal output end of the first voltage regulating module is used for executing a first battery pack charging operation or a first battery pack stopping charging operation;

[0024] A second voltage regulating module, a signal input end of the second voltage regulating module is connected with a second battery pack controlled signal output end of the battery management circuit, a signal output end of the second voltage regulating module is used for executing a second battery pack charging operation or a second battery pack stopping charging operation.

[0025] The battery charging management circuit comprises a first voltage regulating module, a second voltage regulating module, a main control circuit and a display circuit.

[0026] The battery charging management circuit comprises a first voltage regulating module, a second voltage regulating module, a main control circuit and a display circuit.

[0027] The battery charging management circuit comprises a first voltage regulating module, a second voltage regulating module, a main control circuit and a display circuit.

[0028] Compared with the prior art, the battery charging management circuit has the following beneficial effects:

[0029] 1. The battery management circuit and the voltage regulating circuit have the battery state of the battery collected by the battery management circuit, can perform corresponding charging / stop charging operation according to the battery state through the voltage regulating circuit, can collect and adjust the common type of battery on the market, have the battery repair function and the strong compatibility, make the battery of the battery management system can adjust the charging voltage and the charging current according to the battery state of itself, and the battery management circuit can also detect whether the battery is put into the battery management system, thereby preventing the charging or discharging operation on the empty battery tank, avoiding the short circuit of the battery management system and other safety risks.

[0030] 2. The battery management circuit includes a detection module, a first battery group state collection module and a second battery group state collection module, can manage two groups of batteries at the same time, and can independently collect and monitor the battery state of the two groups of batteries, thereby ensuring that each group of batteries can maintain the best working state, avoiding mutual interference between the two groups of batteries and causing performance reduction.

DRAWINGS

[0031] In order to more clearly illustrate the technical scheme in the embodiment of the utility model, the following will be needed to use the drawings in the embodiment description.

[0032] Fig. 1 The structural block diagram of the utility model;

[0033] Fig. 2 The partial circuit structure diagram of the battery management circuit and the voltage regulating circuit of the utility model;

[0034] Fig. 3 The partial circuit structure diagram of the main control circuit of the utility model;

[0035] Fig. 4 The partial circuit structure diagram of the display circuit of the utility model.

CONCRETE IMPLEMENTATION

[0036] In order to make the technical problem, technical scheme and beneficial effect solved by the utility model more clearly, the following will be further detailed by combining with the drawings and examples. It should be understood that the specific examples described here are only used to explain the utility model, and are not used to limit the utility model.

[0037] Specific examples, combined Figs. 1 to 4As shown, further illustrate the technical scheme of the utility model, a battery charging management circuit, including battery management circuit 100, main control circuit 200 and voltage regulation circuit 300, the detection signal input end of battery management circuit 100 is used to detect whether the battery management system has battery, if yes, then the detection signal output end of battery management circuit 100 outputs battery detection signal, the collection signal input end of battery management electric 100 is used to receive the battery detection signal, the collection signal output end of battery management circuit is used to collect battery state, and battery state collection signal is output, the signal input end of main control circuit 200 is connected with the collection signal output end of battery management circuit 100, the control signal output end of main control circuit 200 is connected with the controlled signal input end of battery management circuit 100, is used to output charging control signal or stop charging control signal according to the battery state collection signal, the signal input end of voltage regulation circuit 300 is connected with the controlled signal output end of battery management circuit 100, the signal output end of voltage regulation circuit 300 is used to execute charging operation according to the charging control signal on one hand, and is used to execute stop charging operation according to the stop charging control signal on the other hand.Through the battery management circuit 100 collection battery state, can according to the battery state through voltage regulation circuit 300 executes corresponding charging / stop charging operation, and the battery of the common type on the market can be collected and regulated, has the battery repair function and strong compatibility, so that the battery of the battery management system can adjust charging voltage and charging current according to the battery state of itself;The battery management circuit 100 can also detect whether the battery is put into the battery management system, so as to prevent charging or discharging operation on the empty battery tank, avoid other safety risks such as short circuit of the battery management system.

[0038] Further, as a preferred embodiment of the present scheme but not limited, the controlled signal output end of the battery management circuit includes a first battery pack controlled signal output end and a second battery pack controlled signal output end;

[0039] The charging control signal includes a first battery pack charging control signal and a second battery pack charging control signal, and the stop charging control signal includes a first battery pack stop charging control signal and a second battery pack stop charging control signal.

[0040] Further, as a preferred embodiment of the present scheme but not limited, the battery management circuit 100 supports the common type of battery on the market, and the battery management circuit 100 only detects whether the battery management system has battery, and manages the charging of the battery in the battery management system, has strong compatibility, and can be applied to the charging of the common type of battery on the market.

[0041] Further, as a preferred embodiment of the present scheme but not limited, the battery management circuit 100 comprises a detection module, a first battery pack state acquisition module and a second battery pack state acquisition module, a signal input end of the detection module is connected with a positive electrode end of the battery, a signal output end of the detection module is connected with a detection signal input end of the battery management circuit, a signal input end of the first battery pack state acquisition module is connected with a detection signal output end of the battery management circuit, a signal output end of the first battery pack state acquisition module is used to output a first battery pack state acquisition signal according to the battery detection signal, a signal input end of the second battery pack state acquisition module is connected with the detection signal output end of the battery management circuit, and a signal output end of the second battery pack state acquisition module is used to output a second battery pack state acquisition signal according to the battery detection signal.

[0042] Specifically, in the present embodiment, two groups of batteries can be put in at the same time, the battery states of the two groups of batteries are respectively acquired by the first battery pack state acquisition module and the second battery pack state acquisition module, and the battery state acquisition information of the two groups of batteries is transmitted to the master control circuit by the battery management circuit, so that the charging or stopping of charging of the two groups of batteries is respectively controlled by the master control circuit.

[0043] In the present embodiment, the battery management circuit can manage two groups of batteries at the same time, and can independently acquire and monitor the battery states of the two groups of batteries, thereby ensuring that each group of batteries can maintain the best working state and avoiding mutual interference between the two groups of batteries to cause performance degradation.

[0044] Further, as a preferred embodiment of the present scheme but not limited, the detection module comprises a detection resistor R10, a detection signal input end (i.e. the 13th pin in the present embodiment) of the battery management circuit is connected with one end of the detection resistor R10, and the other end of the detection resistor R10 is connected with the positive electrode end of the battery.

[0045] Specifically, when one group of batteries (i.e. the first battery pack) is put in the battery management system, the battery management circuit forms a conduction loop through the detection resistor, the put-in battery and the first battery pack state acquisition module, so that the battery management system can detect that at least one group of batteries is put in the battery management system through the detection resistor R10.

[0046] In the present embodiment, the battery management system can detect the presence of the battery through the detection resistor R10, thereby avoiding charging or discharging operation in the absence of the battery, reducing the safety risk, and at the same time, the battery management system can adapt to different battery configurations and types, improving the flexibility and universality of the battery management system.

[0047] Further, as a preferred embodiment of the present solution but not as a limitation, the first battery pack state acquisition module comprises a first battery pack voltage acquisition unit and a first battery pack current acquisition unit, a signal input end of the first battery pack voltage acquisition unit is connected with a positive electrode end of the first battery pack, a signal output end of the first battery pack voltage acquisition unit outputs a first battery pack voltage acquisition signal, and a signal input end of the first battery pack current acquisition unit is used to acquire a charging current of the first battery pack, and a signal output end of the first battery pack current acquisition unit outputs a first battery pack charging current signal.

[0048] In the embodiment, the first battery pack state acquisition module can monitor and accurately acquire the voltage state and the charging current state of the first battery pack in real time, and thus can prevent overcharging and overdischarging of the first battery pack, and can realize the function of battery repair; meanwhile, by acquiring the battery state of the first battery pack, the charging voltage and the charging current can be accurately controlled, and thus the service life of the battery is prolonged.

[0049] Further, as a preferred embodiment of the present solution but not as a limitation, the first battery pack voltage acquisition unit comprises a resistor R12, one end of the first battery pack is connected with one end of the resistor R12, and the other end of the resistor R12 is connected with a signal input end (i.e. the 11th pin in the embodiment) of the first battery pack voltage acquisition unit.

[0050] Specifically, when the battery management system is provided with a group of batteries (i.e. the first battery pack), the signal input end of the first battery pack voltage acquisition unit can acquire the voltage of the first battery pack through the resistor R12.

[0051] Further, as a preferred embodiment of the present solution but not as a limitation, the first battery pack current acquisition unit comprises a switch tube Q10, a resistor R15, a resistor R19 and a resistor RX1, a signal input end (i.e. the 14th pin in the embodiment) of the first battery pack current acquisition unit is connected with a gate of the switch tube Q10 on one hand and connected with one end of the resistor R19 on the other hand, the other end of the resistor R19 is connected with the resistor RX1, the other end of the resistor RX1 is connected with a source of the switch tube Q10, a drain of the switch tube Q10 is connected with a negative electrode end of the first battery pack on one hand and connected with one end of the resistor R15 on the other hand, and the other end of the resistor R15 is connected with a signal output end (i.e. the 12th pin in the embodiment) of the first battery pack current acquisition unit.

[0052] In the embodiment, the signal input end of the first battery pack voltage acquisition unit can collect the voltage state of the first battery pack in real time through the resistance R12, thereby preventing overcharging of the first battery pack and protecting the first battery pack from damage, and simplifying the circuit design by using the resistance R12 as a voltage acquisition element, and having a simple circuit structure.

[0053] The first battery pack current acquisition unit comprises a switch tube Q10, a resistance R15, a resistance R19 and a resistance RX1 to form a charging current acquisition circuit, thereby realizing flexible management of the charging current and ensuring that the battery management system can stop charging the first battery pack in time through the voltage regulating circuit when the charging current of the first battery pack is less than 50 mA, thereby preventing damage to the first battery pack.

[0054] Further, as a preferred embodiment but not a limitation of the present scheme, the second battery pack state acquisition module comprises a second battery pack voltage acquisition unit and a second battery pack current acquisition unit, the signal input end of the second battery pack voltage acquisition unit is connected with the positive terminal of the second battery pack, the signal output end of the second battery pack voltage acquisition unit outputs a second battery pack voltage acquisition signal, and the signal input end of the second battery pack current acquisition unit is used to acquire the charging current of the second battery pack, and the signal output end of the second battery pack current acquisition unit outputs a second battery pack charging current signal.

[0055] In the embodiment, the second battery pack state acquisition module can monitor and accurately acquire the voltage state and charging current state of the second battery pack in real time, thereby preventing overcharging and overdischarging of the second battery pack and achieving the function of repairing the battery; and by acquiring the battery state of the second battery pack, the charging voltage and charging current can be accurately controlled, thereby prolonging the service life of the battery.

[0056] Further, as a preferred embodiment but not a limitation of the present scheme, the second battery pack voltage acquisition unit comprises a resistance R17, one end of the second battery pack is connected with one end of the resistance R17, and the other end of the resistance R17 is connected with the signal input end of the second battery pack voltage acquisition unit.

[0057] Specifically, when the battery management system has a second group of batteries (i.e. the second battery pack), the signal input end of the second battery pack voltage acquisition unit can collect the voltage of the second battery pack through the resistance R17.

[0058] Further, as a preferred embodiment of the present solution but not as a limitation, the second battery pack current acquisition unit comprises a switch tube Q11, a resistor R20, a resistor R21, a resistor R23 and a resistor R24, a signal input end of the second battery pack current acquisition unit (i.e. the RB5 / PC3 pin of the present embodiment) is connected with one end of the resistor R21, the other end of the resistor R21 is connected with the gate of the switch tube Q11 on one hand and with one end of the resistor R23 on the other hand, the other end of the resistor R23 is connected with the source of the switch tube Q11, the drain of the switch tube Q11 is connected with the negative terminal of the second battery pack on one hand and with one end of the resistor R20 on the other hand, the other end of the resistor R20 is connected with the signal output end of the first battery pack current acquisition unit (i.e. the RC0 / AIN19 pin of the present embodiment).

[0059] In the present embodiment, the signal input end of the second battery pack voltage acquisition unit can acquire the voltage state of the second battery pack in real time through the resistor R17, thereby preventing overcharging of the second battery pack and protecting the second battery pack from damage, and at the same time, the resistor R17 is used as a voltage acquisition element, which simplifies the circuit design and has a simple circuit structure.

[0060] The second battery pack current acquisition unit comprises a switch tube Q11, a resistor R20, a resistor R21, a resistor R23 and a resistor R24 to form a charging current acquisition circuit, which realizes flexible management of the charging current and ensures that when the charging current of the second battery pack is less than 50mA, the battery management system can stop charging the first battery pack in time through the voltage regulation circuit, thereby preventing damage to the second battery pack.

[0061] Further, as a preferred embodiment of the present solution but not as a limitation, the main control circuit 200 comprises a main control chip, and the model of the main control chip is CMS80f7316. In specific implementation, the model of the main control chip can also be replaced by other main control chips with the same function.

[0062] In the present embodiment, the main control chip CMS80f7316 is an enhanced flash 8-bit controller, and the CMS80f7316 has a low voltage detection function and a PWM signal regulation function. The CMS80f7316 can analyze and process whether the current voltage of the battery is lower than 4.2V based on the received battery state acquisition signal. If the current voltage is lower than 4.2V, the PWM signal regulation function outputs a PWM control signal to make the charging mode of the battery be constant current mode, otherwise, the PWM signal regulation function makes the charging mode of the battery be constant voltage mode.

[0063] Further, as a preferred embodiment of the present scheme but not as a limitation, the main control circuit 200 can further add a register for storing and calling the control program of the dishwasher, and the register can be implemented by using an EEPROM, a Flash, an FRAM or the like non-volatile register.

[0064] Further, as a preferred embodiment of the present scheme but not as a limitation, the voltage regulating circuit 300 comprises a first voltage regulating module and a second voltage regulating module, the signal input end of the first voltage regulating module is connected with the first battery pack controlled signal output end of the battery management circuit, the signal output end of the first voltage regulating module is used to execute the first battery pack charging operation or the first battery pack stop charging operation, the signal input end of the second voltage regulating module is connected with the second battery pack controlled signal output end of the battery management circuit, and the signal output end of the second voltage regulating module is used to execute the second battery pack charging operation or the second battery pack stop charging operation.

[0065] Further, as a preferred embodiment of the present scheme but not as a limitation, the first voltage regulating module comprises a switch-on element Q1, a switch-on element Q2, a switch tube Q4, a switch tube Q7, a diode D1, an inductor L1, a resistor R1, a pull-up resistor R2 and a resistor R8, the first battery pack controlled signal output end (i.e. the 17th pin of the present embodiment) is connected with one end of the resistor R1 on one hand and connected with the base of the switch-on element Q2 on the other hand, the second end of the resistor R1 is connected with the emitter of the switch-on element Q2, the collector of the switch-on element Q2 is connected with the base of the switch-on element Q1 on one hand and connected with the positive end of the diode D1 on the other hand, the base of the switch-on element Q1 is connected with the pull-up resistor R2, the common node of the emitter of the switch-on element Q1 and the negative end of the diode D1 is connected with the gate of the switch tube Q4, the collector of the switch-on element Q1 is connected with the drain of the switch tube Q4, the inductor L1 is connected between the source of the switch tube Q4 and the drain of the switch tube Q7, the drain of the switch tube Q7 is connected with one end of the resistor R8, the other end of the resistor R8 is connected with the gate of the switch tube Q7 on one hand and connected with the signal output end (i.e. the 16th pin of the present embodiment) of the first voltage regulating module on the other hand.

[0066] Specifically, after the main control circuit receives the first battery pack state collection signal, it judges whether the current voltage of the first battery pack is lower than 4.2V or the current charging current of the first battery pack is less than 50mA via the analysis and processing of the main control chip, and then outputs the corresponding first battery pack charging control signal or first battery pack stop charging control signal to control the first battery pack to execute the corresponding operation.

[0067] The first battery pack charging control signal comprises a first battery pack constant current mode PWM regulation signal and a first battery pack constant voltage mode PWM regulation signal.

[0068] More specifically, when the main control circuit receives the first battery pack state acquisition signal, it determines whether the current voltage of the first battery pack is lower than 4.2V through analysis and processing of the main control chip. If it is lower than 4.2V, the main control circuit outputs a first battery pack constant current mode PWM regulation signal through the first battery pack controlled signal output end of the battery management circuit. At this time, the base of the switching on element Q2 receives a signal, so the switching on element Q2 is turned on. The collector of the switching on element Q2 is connected with the base of the switching on element Q1. When the switching on element Q2 is turned on, the switching on element Q1 is also turned on. The gate of the switching tube Q4 is connected with the emitter of the switching on element Q1. When the switching on element Q1 is turned on, the switching tube Q4 is also turned on. Similarly, at this time, the switching tube Q7 is also turned on, thereby controlling the first battery pack to perform constant current mode charging.

[0069] If it is 4.2V, the main control circuit outputs a first battery pack constant voltage mode PWM regulation signal through the first battery pack controlled signal output end of the battery management circuit. At this time, the base of the switching on element Q2 receives a signal, so the switching on element Q2 is turned on. The collector of the switching on element Q2 is connected with the base of the switching on element Q1. When the switching on element Q2 is turned on, the switching on element Q1 is also turned on. The gate of the switching tube Q4 is connected with the emitter of the switching on element Q1. When the switching on element Q1 is turned on, the switching tube Q4 is also turned on. Similarly, at this time, the switching tube Q7 is also turned on, thereby controlling the first battery pack to perform constant voltage mode charging.

[0070] In addition, if the main control circuit detects from the received first battery pack state acquisition signal that the current charging current of the first battery pack is less than 50mA, it is determined that the first battery pack is fully charged. The main control circuit outputs a first battery pack stop charging control signal through the first battery pack controlled signal output end of the battery management circuit. At this time, the base of the switching on element Q2 receives a signal, so the switching on element Q2 is turned on. The collector of the switching on element Q2 is connected with the base of the switching on element Q1. When the switching on element Q2 is turned on, the switching on element Q1 is also turned on. The gate of the switching tube Q4 is connected with the emitter of the switching on element Q1. When the switching on element Q1 is turned on, the switching tube Q4 is also turned on. Similarly, at this time, the switching tube Q7 is also turned on, thereby controlling the first battery pack to stop charging.

[0071] Further, as a preferred embodiment of the present scheme but not as a limitation, the second voltage regulating module comprises a switch-on element Q3, a switch-on element Q5, a switch Q8, a switch Q9, a resistor R5, a pull-up resistor R6, a resistor R7, a resistor R11, a resistor R14 and an inductor L2. One end of the resistor R5 is connected to the second battery pack controlled signal output end (i.e. the 19th pin of the present embodiment). The other end of the resistor R5 is connected to one end of the resistor R7 and the base of the switch-on element Q5. The other end of the resistor R7 is connected to the emitter of the switch-on element Q5. The collector of the switch-on element Q5 is connected to the base of the switch-on element Q3. The base of the switch-on element Q3 is connected with the pull-up resistor R6. The emitter of the switch-on element Q3 is connected to the gate of the switch Q8. The collector of the switch-on element Q3 is connected to the drain of the switch Q8. The inductor L2 is connected between the source of the switch Q8 and the drain of the switch Q9. The resistor R14 is connected between the source and the gate of the switch Q9. The resistor R11 is connected between the gate of the switch Q9 and the signal output end of the second voltage regulating module (i.e. the 18th pin of the present embodiment).

[0072] Specifically, after receiving the second battery pack state acquisition signal, the main control circuit analyzes and processes via the main control chip to determine whether the current voltage of the second battery pack is lower than 4.2V or the current charging current of the second battery pack is less than 50mA, and then outputs the corresponding second battery pack charging control signal or second battery pack stop charging control signal to control the second battery pack to perform the corresponding operation.

[0073] The second battery pack charging control signal comprises a PWM regulating signal of the second battery pack constant current mode and a PWM regulating signal of the second battery pack constant voltage mode.

[0074] More specifically, when the main control circuit receives the second battery state acquisition signal, it analyzes and judges whether the current voltage of the first battery is lower than 4.2V via the main control chip. If it is lower than 4.2V, the main control circuit outputs the PWM regulating signal of the second battery constant current mode through the second battery controlled signal output end of the battery management circuit. At this time, the base of the switching on element Q5 receives the signal, so that the switching on element Q5 is turned on. The collector of the switching on element Q5 is connected with the base of the switching on element Q3. When the switching on element Q5 is turned on, the switching on element Q3 will be turned on. The gate of the switching tube Q8 is connected with the emitter of the switching on element Q3. When the switching on element Q3 is turned on, the switching tube Q8 will also be turned on. Similarly, the switching tube Q9 will also be turned on at this time, so as to control the second battery to charge in the constant current mode.

[0075] If it is 4.2V, the main control circuit outputs the PWM regulating signal of the second battery constant voltage mode through the second battery controlled signal output end of the battery management circuit. At this time, the base of the switching on element Q5 receives the signal, so that the switching on element Q5 is turned on. The collector of the switching on element Q5 is connected with the base of the switching on element Q3. When the switching on element Q5 is turned on, the switching on element Q3 will be turned on. The gate of the switching tube Q8 is connected with the emitter of the switching on element Q5. When the switching on element Q5 is turned on, the switching tube Q8 will also be turned on. Similarly, the switching tube Q9 will also be turned on at this time, so as to control the second battery to charge in the constant voltage mode.

[0076] In addition, if the main control circuit detects from the received second battery state acquisition signal that the current charging current of the second battery is less than 50mA, it is determined that the second battery is fully charged. The main control circuit outputs the second battery stop charging control signal through the second battery controlled signal output end of the battery management circuit. At this time, the base of the switching on element Q5 receives the signal, so that the switching on element Q3 is turned on. The collector of the switching on element Q5 is connected with the base of the switching on element Q3. When the switching on element Q5 is turned on, the switching on element Q3 will be turned on. The gate of the switching tube Q8 is connected with the emitter of the switching on element Q3. When the switching on element Q3 is turned on, the switching tube Q8 will also be turned on. Similarly, the switching tube Q9 will also be turned on at this time, so as to control the second battery to stop charging.

[0077] Further, as a preferred embodiment of the present scheme but not limited, it also includes a display circuit, the signal input end of the display circuit is connected with the signal output end of the main control circuit, and the display circuit is used to display the charging state of the battery.

[0078] Specifically, the display circuit comprises a display driving chip IC2 and an LCD display IC3, a signal input end of the display driving chip IC2 is connected with a signal output end of the master control circuit, a signal output end of the display driving chip IC2 is connected with a signal input end of the LCD display IC3, and a signal output end of the LCD display IC3 performs the operation of displaying the battery charging state.

[0079] The charging state of the battery comprises charging mode, percentage of electric quantity, battery capacity, charging voltage and other charging information.

[0080] In the embodiment, the display circuit can help the user to clearly obtain the charging information of the current battery, such as the charging mode and the charging voltage, and the user can know the current battery state of the battery at any time, thereby improving the interactive experience of the user and the battery management system.

[0081] Further, as a preferred embodiment of the present scheme but not limitation, the model of the display driving chip IC2 is TM1621, and in the specific implementation, the model of the display driving chip IC2 can also be replaced by other display driving chips with the same function.

[0082] In the embodiment, the display driving chip TM1621 is an LCD driver with memory mapping and multiple functions, and the TM1621 is suitable for various LCD application occasions, including LCD display modules and display subsystems. In the embodiment, the TM1621 is connected with the LCD display IC3 to display the charging state of the battery, so that the user can clearly know the current battery state of the battery, thereby better managing the charging and discharging cycle of the battery.

[0083] Those skilled in the art should understand that the above description is an embodiment provided in combination with specific content, and the specific implementation of the utility model is not limited to these descriptions. Since the industry naming is not the same, the naming is not limited to the above, and the English naming is not limited. Any approximation, similarity or replacement of the method and structure of the utility model, or the technical deduction or replacement under the premise of the concept of the utility model, should be regarded as the protection range of the utility model.

Claims

1. A battery charge management circuit, characterized by, The application relates to a battery management system, which comprises the following parts: a battery management circuit, a detection signal input end of the battery management circuit is used for detecting whether a battery exists in the battery management system, if the battery exists, a detection signal output end of the battery management circuit outputs a battery detection signal; a collection signal input end of the battery management circuit is used for receiving the battery detection signal, and a collection signal output end of the battery management circuit is used for collecting a battery state and outputting a battery state collection signal; a main control circuit, a control signal input end of the main control circuit is connected with the collection signal output end of the battery management circuit, a control signal output end of the main control circuit is connected with a controlled signal input end of the battery management circuit, and the main control circuit is used for outputting a charging control signal or a stop charging control signal according to the battery state collection signal; a voltage regulating circuit, a signal input end of the voltage regulating circuit is connected with a controlled signal output end of the battery management circuit, and a signal output end of the voltage regulating circuit is used for executing a charging operation according to the charging control signal and executing a stop charging operation according to the stop charging control signal; the voltage regulating circuit comprises: a first voltage regulating module, a signal input end of the first voltage regulating module is connected with a first battery group controlled signal output end of the battery management circuit, and a signal output end of the first voltage regulating module is used for executing a first battery group charging operation or a first battery group stop charging operation; a second voltage regulating module, a signal input end of the second voltage regulating module is connected with a second battery group controlled signal output end of the battery management circuit, and a signal output end of the second voltage regulating module is used for executing a second battery group charging operation or a second battery group stop charging operation.

2. A battery charge management circuit according to claim 1, wherein, the battery management circuit comprises: a detection module, a signal input end of the detection module is connected with a positive electrode end of a battery, and a signal output end of the detection module is connected with a detection signal input end of the battery management circuit; a first battery group state collection module, a signal input end of the first battery group state collection module is connected with a detection signal output end of the battery management circuit, and a signal output end of the first battery group state collection module is used for outputting a first battery group state collection signal according to the battery detection signal; a second battery group state collection module, a signal input end of the second battery group state collection module is connected with a detection signal output end of the battery management circuit, and a signal output end of the second battery group state collection module is used for outputting a second battery group state collection signal according to the battery detection signal.

3. A battery charge management circuit according to claim 2, wherein, the first battery group state collection module comprises: a first battery group voltage collection unit, a signal input end of the first battery group voltage collection unit is connected with a positive electrode end of a first battery group, and a signal output end of the first battery group voltage collection unit outputs a first battery group voltage collection signal; a first battery group current collection unit, a signal input end of the first battery group current collection unit is used for collecting a charging current of the first battery group, and a signal output end of the first battery group current collection unit outputs a first battery group charging current signal.

4. The battery charge management circuit of claim 2, wherein, the second battery group state collection module comprises: A second battery pack voltage acquisition unit, a signal input end of the second battery pack voltage acquisition unit is connected with a positive pole end of a second battery pack, and a signal output end of the second battery pack voltage acquisition unit outputs a second battery pack voltage acquisition signal; A second battery pack current acquisition unit, a signal input end of the second battery pack current acquisition unit is used for acquiring a charging current of the second battery pack, and a signal output end of the second battery pack current acquisition unit outputs a second battery pack charging current signal.

5. A battery charge management circuit according to claim 3, wherein, The first battery pack current acquisition unit comprises a switch tube Q10, a resistor R15, a resistor R19 and a resistor RX1, one end of the signal input end of the first battery pack current acquisition unit is connected with a gate of the switch tube Q10, and the other end of the signal input end of the first battery pack current acquisition unit is connected with one end of the resistor R19, the other end of the resistor R19 is connected with the resistor RX1, the other end of the resistor RX1 is connected with a source of the switch tube Q10, a drain of the switch tube Q10 is connected with a negative pole end of the first battery pack on one hand and connected with one end of the resistor R15 on the other hand, and the other end of the resistor R15 is connected with the signal output end of the first battery pack current acquisition unit.

6. A battery charge management circuit according to claim 4, wherein, The second battery pack current acquisition unit comprises a switch tube Q11, a resistor R20, a resistor R21, a resistor R23 and a resistor R24, the signal input end of the second battery pack current acquisition unit is connected with one end of the resistor R21, the other end of the resistor R21 is connected with a gate of the switch tube Q11 on one hand and connected with one end of the resistor R23 on the other hand, the other end of the resistor R23 is connected with a source of the switch tube Q11, a drain of the switch tube Q11 is connected with a negative pole end of the second battery pack on one hand and connected with one end of the resistor R20 on the other hand, and the other end of the resistor R20 is connected with the signal output end of the first battery pack current acquisition unit.

7. The battery charge management circuit of claim 1, wherein, The first voltage regulating module comprises switch-on element Q1, switch-on element Q2, switch Q4, switch Q7, diode D1, inductor L1, resistor R1, pull-up resistor R2 and resistor R8, one end of the first battery pack controlled signal output end is connected with one end of the resistor R1, and the other end of the first battery pack controlled signal output end is connected with the base of the switch-on element Q2, the second end of the resistor R1 is connected with the emitter of the switch-on element Q2, the collector of the switch-on element Q2 is connected with the base of the switch-on element Q1 and the positive end of the diode D1, the base of the switch-on element Q1 is connected with the pull-up resistor R2, the common node of the emitter of the switch-on element Q1 and the negative end of the diode D1 is connected with the gate of the switch Q4, the collector of the switch-on element Q1 is connected with the drain of the switch Q4, the inductor L1 is connected between the source of the switch Q4 and the drain of the switch Q7, one end of the resistor R8 is connected with the drain of the switch Q7, the other end of the resistor R8 is connected with the gate of the switch Q7 and the signal output end of the first voltage regulating module.

8. The battery charge management circuit of claim 1, wherein, The second voltage regulating module comprises switch-on element Q3, switch-on element Q5, switch Q8, switch Q9, resistor R5, pull-up resistor R6, resistor R7, resistor R11, resistor R14 and inductor L2, the second battery pack controlled signal output end is connected with one end of the resistor R5, the other end of the resistor R5 is connected with one end of the resistor R7 and the base of the switch-on element Q5, the other end of the resistor R7 is connected with the emitter of the switch-on element Q5, the collector of the switch-on element Q5 is connected with the base of the switch-on element Q3, the base of the switch-on element Q3 is connected with the pull-up resistor R6, the emitter of the switch-on element Q3 is connected with the gate of the switch Q8, the collector of the switch-on element Q3 is connected with the drain of the switch Q8, the inductor L2 is connected between the source of the switch Q8 and the drain of the switch Q9, the source of the switch Q9 is connected with the gate of the switch Q9 and the resistor R14, the gate of the switch Q9 is connected with the signal output end of the second voltage regulating module and the resistor R11.

9. The battery charge management circuit of claim 1, wherein, The display circuit is further included, the signal input end of the display circuit is connected with the signal output end of the main control circuit, and the display circuit is used for displaying the charging state of the battery.

Images