Large-current charging and discharging circuit of split type battery cabinet

Abstract

The utility model belongs to the technical field of battery cabinet charging and discharging, and particularly discloses a large-current charging and discharging circuit of a split type battery cabinet, which comprises a voltage-regulating charging unit used for charging a battery, and an indicating circuit and a temperature sampling unit used for collecting the temperature of the battery cabinet are connected onto the voltage-regulating charging unit; the battery protection unit can perform charging protection and give an alarm, the battery protection unit is connected with a filter circuit used for filtering an input signal and an output signal and a control unit used for charging control, and the control unit is connected with a discharging unit; according to the utility model, through the cooperation of the voltage-regulating charging unit, the temperature sampling unit, the battery protection unit and the control unit, the battery protection unit and the temperature sampling unit are used for monitoring the voltage, current, temperature and other parameters of the battery, and when the battery is overcharged, overdischarged, short-circuited or the like, the circuit is cut off in time and an alarm is given out, so that the safety of the battery is ensured.

Description

TECHNICAL FIELD

[0001] The utility model relates to battery cabinet charging and discharging technical field, concretely is a kind of large current charging and discharging circuit of split type battery cabinet. BACKGROUND

[0002] Split type battery cabinet is a kind of equipment specially designed for storing electric energy, which usually includes battery pack, inverter, charge and discharge controller and communication controller, etc.;At present, the charging and discharging mode of split type battery cabinet is usually closely related to the battery management system configured inside, and the battery management system is responsible for monitoring the state of the battery and adjusting the charging and discharging strategy as needed.;

[0003] For example, patent document application No. 201210584607.X discloses a large current charging and discharging circuit for battery capacity distribution cabinet, which includes: a battery interface to be distributed, a current detection circuit, a charging and discharging conversion circuit, a DC input interface and an MCU control unit. The current detection circuit is used to collect the current size of the battery access end. The charging and discharging conversion circuit is used to realize the charging and discharging of the battery to be distributed. The MCU control unit is used to send pulse width modulation signals to the charging and discharging conversion circuit and monitor the voltage across the battery to be distributed in real time. Compared with the prior art, the invention has the following advantages: 1) it can realize large current charging and discharging, shorten the battery capacity distribution period, and reduce the production cost of the battery.

[0004] However, although the above-mentioned charging and discharging circuit can realize large current charging and discharging, effectively shorten the battery capacity distribution period, and reduce the production cost of the battery, if the battery appears overcharge, overdischarge or short circuit during the charging and discharging process, it may damage the battery or cause safety problems. Therefore, we need to propose a large current charging and discharging circuit for split type battery cabinet to solve the above-mentioned problems, so that it can monitor the voltage, current and temperature parameters of the battery, and when the battery appears overcharge, overdischarge or short circuit, it can cut off the circuit in time and send an alarm to ensure the safety of the battery. UTILITY MODEL CONTENTS

[0005] The utility model aims at providing a large current charging and discharging circuit for split type battery cabinet, which monitors the voltage, current and temperature parameters of the battery through the battery protection unit and temperature sampling unit, and cuts off the circuit in time and sends an alarm when the battery appears overcharge, overdischarge or short circuit, to ensure the safety of the battery and solve the problems raised in the background art.

[0006] To achieve the above-mentioned purpose, the utility model provides the following technical scheme: a large current charging and discharging circuit for split type battery cabinet, comprising: a voltage regulating charging unit for charging the battery, an indicating circuit connected to the voltage regulating charging unit, and a temperature sampling unit for collecting the temperature of the battery cabinet.

[0007] A battery protection unit capable of charging protection and issuing an alarm, a filter circuit for filtering input and output signals being connected to the battery protection unit;

[0008] A control unit for charging control, a discharge unit being connected to the control unit, the temperature sampling unit being electrically connected to the voltage-regulating charging unit, and the control unit being electrically connected to the voltage-regulating charging unit and the battery protection unit respectively.

[0009] Preferably, the voltage-regulating charging unit comprises a boost chip U2, a capacitor C28 being connected in parallel to the battery at the 9th pin of the boost chip U2, a resistor R30 being connected to the 11th pin of the boost chip U2, a capacitor C29 being connected to the 12th pin of the boost chip U2, the other end of the capacitor C29 and the other end of the resistor R30 being grounded, a capacitor C30 being connected to the 3rd pin of the boost chip U2, one end of the capacitor C30 being connected to an inductor L1, one end of the inductor L1 being connected to a capacitor C26, and the connection end of the inductor L1 and the capacitor C30 being connected to the 5th pin and the 6th pin of the boost chip U2.

[0010] Preferably, the indication circuit comprises a light-emitting diode D12 and a light-emitting diode D22, one end of the light-emitting diode D12 being connected to the 13th pin of the boost chip U2, one end of the light-emitting diode D22 being connected to the 14th pin of the boost chip U2, and the other end of the light-emitting diode D12 and the other end of the light-emitting diode D22 being connected to a VCC voltage.

[0011] Preferably, the temperature sampling unit comprises a thermistor NTC, one end of the thermistor NTC being grounded, the other end of the thermistor NTC being connected to a resistor R26, the other end of the resistor R26 being connected to a resistor R27 for connecting a VCC, and the connection end of the resistor R27 and the resistor R26 being connected to the 1st pin of the boost chip U2.

[0012] Preferably, the battery protection unit comprises a charging chip U1, a ground resistor R22 being connected to the 2nd pin of the charging chip U1, a resistor R24 and a light-emitting diode D4 being connected in series in sequence at the 6th pin of the charging chip U1, a resistor R23 and a light-emitting diode D3 being connected in series in sequence at the 7th pin of the charging chip U1, the other end of the light-emitting diode D3 and the other end of the light-emitting diode D4 being connected to the 8th pin of the charging chip U1, a diode D5 and a resistor R21 for connecting a VUSB being connected to the 4th pin of the charging chip U1.

[0013] Preferably, the filter circuit comprises capacitors C21 and C22 connected in parallel at the 4th pin of the charging chip U1 and capacitors C23 and C24 connected in parallel at the 5th pin of the charging chip U1, the other connection end of the capacitors C23 and C24 is connected with a diode D6 for connecting with the battery.

[0014] Preferably, the control unit comprises a control chip U3, a resistor R7 and a diode D2 are connected in series at the 1st pin of the control chip U3, one end of the diode D2 is connected with a resistor R8, one end of the resistor R8 is connected with a resistor R9, and the connection end of the resistor R8 and the resistor R9 is connected with the 3rd pin of the control chip U3, the other end of the resistor R9 is connected with a capacitor C5, one end of the capacitor C5 is connected with the 1st pin of the control chip U3, a capacitor C4 is connected at the 2nd pin of the control chip U3, resistors R12 and R6 are connected in parallel at the 4th pin of the control chip U3, and the other end of the capacitor C4, the resistor R12, the resistor R6 and the capacitor C5 is grounded.

[0015] Preferably, the discharge unit comprises a diode D1 connected with the 5th pin of the control chip U3, one end of the diode D1 is connected with a resistor R5, one end of the resistor R5 is connected in parallel with a capacitor C3, a resistor R4 and resistors R2 and R3 arranged in series, one end of the resistor R3 is connected with the 1st pin of the control chip U3, one end of the resistor R2 is connected in parallel with an inductor L2 and a resistor R1, one end of the resistor R1 is grounded through a capacitor C1, and the other end of the capacitor C1 is grounded through a capacitor C2.

[0016] Compared with the prior art, the utility model has the advantages that:

[0017] 1、 the utility model discloses a voltage -regulating charging unit, temperature sampling unit, battery protection unit and the cooperation of control unit, utilize battery protection unit and with temperature sampling unit to monitor the voltage, current and temperature parameters such as battery, when battery appears overcharge, overdischarge or short circuit etc., timely cut off circuit and send out the alarm, ensure the safety of battery.

[0018] 2、 the utility model discloses the cooperation of filter circuit and battery protection unit, can filter processing to the input signal and output signal of battery protection unit, improve the accuracy of battery protection unit data transmission.

[0019] 3、 the utility model discloses the cooperation of indicating circuit and voltage -regulating charging unit, can display the condition of charging in real time, and it is convenient for the charging personnel to observe the charge -discharge state of battery in time. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 Circuit diagram of the utility model;

[0021] Figure 2 Circuit diagram of the battery protection unit of the utility model;

[0022] Figure 3 Circuit diagram of the control unit of the utility model;

[0023] Figure 4 Circuit diagram of the voltage-regulating charging unit of the utility model. DETAILED DESCRIPTION

[0024] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of the utility model.

[0025] Please refer to Figures 1-4 The utility model provides a kind of technical solutions: the large current charging circuit of split type battery cabinet, including the voltage-regulating charging unit for charging battery, the battery protection unit that can carry out charging protection and send alarm and the control unit for charging control, voltage-regulating charging unit is connected with indicating circuit and temperature sampling unit for collecting battery cabinet temperature, utilize battery protection unit and with temperature sampling unit to monitor the voltage, current and temperature etc.

[0026] The voltage-regulating charging unit includes a boost chip U2, a capacitor C28 is connected in parallel on the battery on the 9-pin of the boost chip U2, a resistor R30 is connected to the 11-pin of the boost chip U2, a capacitor C29 is connected to the 12-pin of the boost chip U2, the other end of the capacitor C29 and the other end of the resistor R30 are both grounded, a capacitor C30 is connected to the 3-pin of the boost chip U2, one end of the capacitor C30 is connected to an inductor L1, one end of the inductor L1 is connected to a capacitor C26, and the connection end of the inductor L1 and the capacitor C30 is connected to the 5-pin and the 6-pin of the boost chip U2.

[0027] The indicating circuit includes a light-emitting diode D12 and a light-emitting diode D22, one end of the light-emitting diode D12 is connected to the 13-pin of the boost chip U2, one end of the light-emitting diode D22 is connected to the 14-pin of the boost chip U2, and the other end of the light-emitting diode D12 and the other end of the light-emitting diode D22 are both connected to VCC voltage.

[0028] The temperature sampling unit comprises a thermistor NTC, one end of the thermistor NTC is grounded, the other end of the thermistor NTC is connected with a resistor R26, the other end of the resistor R26 is connected with a resistor R27 for connecting VCC, the connection end of the resistor R27 and the resistor R26 is connected with the pin 1 of the boost chip U2, the temperature of the battery is collected in real time through the thermistor NTC, when the battery appears overcharge, overdischarge or short circuit and the like, the circuit is cut off in time through the control unit and an alarm is sent, so as to ensure the safety of the battery.

[0029] The battery protection unit is connected with a filter circuit for filtering input signals and output signals, the battery protection unit comprises a charging chip U1, the pin 2 of the charging chip U1 is connected with a ground resistor R22, the pin 6 of the charging chip U1 is connected with a resistor R24 and a light emitting diode D4 in sequence, the pin 7 of the charging chip U1 is connected with a resistor R23 and a light emitting diode D3 in sequence, the other end of the light emitting diode D3 and the other end of the light emitting diode D4 are connected with the pin 8 of the charging chip U1, the pin 4 of the charging chip U1 is connected with a diode D5 and a resistor R21 for connecting VUSB, the other end of the light emitting diode D3 and the other end of the light emitting diode D4 are used for display when alarming, the diode D5 is used for preventing reverse connection protection, preventing reverse flow of the circuit, when an external power supply (such as USB) is connected to the battery protection unit, the charging voltage enters the charging chip U1 through the resistor R21 and the diode D5, the charging chip U1 controls the charging process according to the monitored battery voltage and the charging voltage.

[0030] The filter circuit comprises a capacitor C21 and a capacitor C22 connected in parallel on the pin 4 of the charging chip U1 and a capacitor C23 and a capacitor C24 connected in parallel on the pin 5 of the charging chip U1, the connection end of the capacitor C21 and the capacitor C22 away from the boost chip U1 and the connection end of the capacitor C23 and the capacitor C24 away from the boost chip U1 are grounded, the other connection end of the capacitor C23 and the capacitor C24 is connected with a diode D6 for connecting with the battery, the capacitor C23 and the capacitor C24 are used for filtering output signals, the capacitor C21 and the capacitor C22 are used for filtering input signals, so as to ensure the accuracy of data processing of the charging chip U1.

[0031] The control unit is connected with a discharging unit, the temperature sampling unit is electrically connected with the voltage regulating and charging unit, and the control unit is electrically connected with the voltage regulating and charging unit and the battery protection unit respectively.

[0032] The control unit includes a control chip U3, a resistor R7 and a diode D2 are connected in series at the pin 1 of the control chip U3, one end of the diode D2 is connected with a resistor R8, one end of the resistor R8 is connected with a resistor R9, the connection end of the resistor R8 and the resistor R9 is connected with the pin 3 of the control chip U3, the other end of the resistor R9 is connected with a capacitor C5, one end of the capacitor C5 is connected with the pin 1 of the control chip U3, a capacitor C4 is connected at the pin 2 of the control chip U3, the pin 4 of the control chip U3 is connected in parallel with a resistor R12 and a resistor R6, the other end of the capacitor C4, the resistor R12, the resistor R6 and the capacitor C5 is grounded, the working of the voltage-regulating charging unit, the discharging unit, the battery protection unit and the temperature sampling unit is controlled by the control chip U3, the resistor R7 is used for limiting current, and the diode D2 is used as a protection element to prevent reverse current or surge voltage from damaging the circuit, and they together ensure the stability and safety of current in the discharging process.

[0033] The discharging unit includes a diode D1 connected with the pin 5 of the control chip U3, one end of the diode D1 is connected with a resistor R5, one end of the resistor R5 is connected in parallel with a capacitor C3, a resistor R4 and a resistor R2 and a resistor R3 arranged in series, one end of the resistor R3 is connected with the pin 1 of the control chip U3, one end of the resistor R2 is connected in parallel with an inductor L2 and a resistor R1, one end of the resistor R1 is grounded through a capacitor C1, the other end of the capacitor C1 is grounded through a capacitor C2, the diode D1, the inductor L1 and the plurality of capacitors and resistors are used for current regulation, filtering and protection in the discharging process.

[0034] Although the embodiments of the present application have been shown and described, it should be understood by those ordinary skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present application, and the scope of the present application is defined by the appended claims and their equivalents.

Claims

1. A large current charging and discharging circuit for a split battery cabinet, characterized in that: The utility model relates to a kind of battery charging system, including: Voltage regulating charging unit for charging battery, indicating circuit is connected on the voltage regulating charging unit and temperature sampling unit for collecting battery cabinet temperature; Battery protection unit capable of charging protection and issuing alarm, filter circuit for filtering input signal and output signal is connected on the battery protection unit; Control unit for charging control, the temperature sampling unit is electrically connected with voltage regulating charging unit, and the control unit is electrically connected with voltage regulating charging unit and battery protection unit respectively.

2. The large current charging and discharging circuit of the split type battery cabinet according to claim 1, characterized in that: The voltage regulating charging unit includes boost chip U2, capacitor C28 is connected in parallel on the battery on the 9th pin of boost chip U2, resistor R30 is connected on the 11th pin of boost chip U2, capacitor C29 is connected on the 12th pin of boost chip U2, the other end of capacitor C29 and the other end of resistor R30 are all grounded, capacitor C30 is connected on the 3rd pin of boost chip U2, one end of capacitor C30 is connected with inductor L1, one end of inductor L1 is connected with capacitor C26, the connection end of inductor L1 and capacitor C30 is connected with the 5th pin and the 6th pin of boost chip U2.

3. A large current charging and discharging circuit for a split type battery cabinet according to claim 2, characterized in that: The indicating circuit includes light emitting diode D12 and light emitting diode D22, one end of light emitting diode D12 is connected with the 13th pin of boost chip U2, one end of light emitting diode D22 is connected with the 14th pin of boost chip U2, the other end of light emitting diode D12 and the other end of light emitting diode D22 are all connected with VCC voltage.

4. The large current charging and discharging circuit of the split type battery cabinet according to claim 3, characterized in that: The temperature sampling unit includes thermistor NTC, one end of thermistor NTC is grounded, the other end of thermistor NTC is connected with resistor R26, the other end of resistor R26 is connected with resistor R27 for connecting VCC, the connection end of resistor R27 and resistor R26 is connected with the 1st pin of boost chip U2.

5. A large current charging and discharging circuit for a split type battery cabinet according to claim 4, characterized in that: The battery protection unit includes charging chip U1, ground resistor R22 is connected on the 2nd pin of charging chip U1, resistor R24 and light emitting diode D4 are connected in series on the 6th pin of charging chip U1 in turn, resistor R23 and light emitting diode D3 are connected in series on the 7th pin of charging chip U1 in turn, the other end of light emitting diode D3 and the other end of light emitting diode D4 are all connected with the 8th pin of charging chip U1, diode D5 and resistor R21 for connecting VUSB are connected on the 4th pin of charging chip U1.

6. A large current charging and discharging circuit for a split type battery cabinet according to claim 5, characterized in that: The filter circuit includes capacitor C21 and capacitor C22 connected in parallel on the 4th pin of charging chip U1 and capacitor C23 and capacitor C24 connected in parallel on the 5th pin of charging chip U1, the connection end of capacitor C21 and capacitor C22 away from boost chip U1 and the connection end of capacitor C23 and capacitor C24 away from boost chip U1 are all grounded, the other connection end of capacitor C23 and capacitor C24 is connected with diode D6 for connecting battery.

7. The large current charging and discharging circuit of the split type battery cabinet according to claim 6, characterized in that: The control unit comprises a control chip U3, one pin of the control chip U3 is connected with a resistor R7 and a diode D2 in series, one end of the diode D2 is connected with a resistor R8, one end of the resistor R8 is connected with a resistor R9, the connection end of the resistor R8 and the resistor R9 is connected with the pin 3 of the control chip U3, the other end of the resistor R9 is connected with a capacitor C5, one end of the capacitor C5 is connected with the pin 1 of the control chip U3, the pin 2 of the control chip U3 is connected with a capacitor C4, the pin 4 of the control chip U3 is connected with a resistor R12 and a resistor R6 in parallel, the other end of the capacitor C4, the resistor R12, the resistor R6 and the capacitor C5 is grounded.

8. A large current charging and discharging circuit for a split type battery cabinet according to claim 7, characterized in that: The discharge unit comprises a diode D1 connected with the pin 5 of the control chip U3, one end of the diode D1 is connected with a resistor R5, one end of the resistor R5 is connected with a capacitor C3, a resistor R4 and a resistor R2 and a resistor R3 arranged in series in parallel, one end of the resistor R3 is connected with the pin 1 of the control chip U3, one end of the resistor R2 is connected with an inductor L2 and a resistor R1 in parallel, one end of the resistor R1 is grounded through a capacitor C1, the other end of the capacitor C1 is grounded through a capacitor C2.

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