A safety protection system for energy storage battery pack

Abstract

The present disclosure provides a safety protection system for an energy storage battery pack, which belongs to the field of charging safety technology. The energy storage battery pack safety protection system includes: a charging protection module; the charging protection module includes a transistor Q1, a resistor R1, a switch tube Q3, a transistor Q2, a resistor R2 and a switch tube Q3; the emitter of the transistor Q1 is connected to the charging power supply, the collector of the transistor Q1 is grounded through the resistor R1, the base of the transistor Q1 is connected to the collector of the transistor Q1, the base of the transistor Q1 is connected to the base of the transistor Q2, the emitter of the transistor Q2 is connected to the positive electrode of the battery pack, and the collector of the transistor Q2 is grounded through the resistor R2; the collector of the transistor Q2 is connected to the control end of the switch tube Q3, the first end of the switch tube Q3 is connected to the emitter of the transistor Q1, and the second end of the switch tube Q3 is connected to the positive electrode of the battery pack. The present disclosure can solve the problem of complex circuit structure of the traditional overcharging protection system.

Description

Technical Field

[0001] The present disclosure relates to the field of charging safety technology, and in particular to a safety protection system for an energy storage battery pack. Background Art

[0002] With the rapid development of energy storage technology, battery packs, as key energy storage components, have been widely used in various electronic devices, electric vehicles and renewable energy systems. However, there is a risk of overcharging during the charging process of battery packs, which not only shortens the battery life, but may also cause safety accidents such as thermal runaway and fire. The traditional overcharging protection system has a complex circuit structure and lacks an intelligent charging control mechanism, making it difficult to effectively prevent battery overcharging while ensuring charging efficiency. Summary of the invention

[0003] The disclosed embodiment provides a safety protection system for an energy storage battery pack to solve the problem of complex circuit structure of a traditional overcharging protection system.

[0004] The disclosed embodiment provides a safety protection system for an energy storage battery pack, including: a charging protection module;

[0005] The first end of the charging protection module is used to connect to a charging power source, and the second end of the charging protection module is used to connect to a battery pack;

[0006] The charging protection module includes a transistor Q1, a resistor R1, a switch tube Q3, a transistor Q2, a resistor R2, a switch tube Q3 and a diode D2;

[0007] The emitter of the transistor Q1 is used to connect to a charging power source, the collector of the transistor Q1 is grounded through the resistor R1, the base of the transistor Q1 is connected to the collector of the transistor Q1, the base of the transistor Q1 is connected to the base of the transistor Q2, the emitter of the transistor Q2 is used to connect to the positive electrode of the battery pack, the collector of the transistor Q2 is grounded through the resistor R2, and the negative electrode of the battery pack is grounded;

[0008] The collector of the transistor Q2 is connected to the control end of the switch tube Q3, the first end of the switch tube Q3 is connected to the emitter of the transistor Q1, the second end of the switch tube Q3 is connected to the anode of the diode D2, and the cathode of the diode D2 is used to connect to the positive electrode of the battery pack.

[0009] In an exemplary embodiment of the present disclosure, it further includes: a voltage detection module, a comparison module, a switching module and a boost module;

[0010] The first end of the voltage detection module is used to connect to the charging power supply, the second end of the voltage detection module is connected to the first end of the comparison module, and the second end of the comparison module is connected to the control end of the switching module;

[0011] The first end of the switching module is used to connect to the charging power supply, the second end of the switching module is connected to the first end of the charging protection module, the third end of the switching module is connected to the first end of the boost module, and the second end of the boost module is connected to the first end of the charging protection module.

[0012] In an exemplary embodiment of the present disclosure, the comparison module includes: an operational amplifier U1;

[0013] The non-inverting input terminal of the operational amplifier U1 is connected to the second terminal of the voltage detection module, the inverting input terminal of the operational amplifier U1 is connected to the reference voltage, and the output terminal of the operational amplifier U1 is connected to the control terminal of the switching module.

[0014] In an exemplary embodiment of the present disclosure, the comparison module further includes: a voltage regulator tube D4 and a variable resistor RP1;

[0015] The first end of the variable resistor RP1 is connected to the VCC power supply, the second end of the variable resistor RP1 is grounded, the sliding end of the variable resistor RP1 is connected to the inverting input end of the operational amplifier U1, the cathode of the voltage regulator D4 is connected to the inverting input end of the operational amplifier U1, and the anode of the voltage regulator D4 is grounded.

[0016] In an exemplary embodiment of the present disclosure, the voltage detection module includes a resistor R4, a resistor R3 and a capacitor C6;

[0017] The first end of the resistor R4 is used to connect to the charging voltage, the second end of the resistor R4 is grounded through the resistor R3, the second end of the resistor R4 is connected to the non-inverting input terminal of the operational amplifier U1, and the capacitor C6 is connected in parallel with the resistor R3.

[0018] In an exemplary embodiment of the present disclosure, the switching module includes: a transistor Q5 and a relay K2;

[0019] The base of the transistor Q5 is connected to the output end of the operational amplifier U1, the emitter of the transistor Q5 is connected to the VCC power supply, the collector of the transistor Q5 is connected to the first power supply end of the relay K2, the second power supply end of the relay K2 is grounded, the first end of the relay K2 is used to connect to the charging power supply, the second end of the relay K2 is connected to the first end of the charging protection module, and the third end of the relay K2 is connected to the first end of the boost module.

[0020] In an exemplary embodiment of the present disclosure, the boost module includes: an inductor L1, a switch tube Q4, a diode D5 and a capacitor C7;

[0021] The first end of the inductor L1 is connected to the third end of the switching module, the second end of the inductor L1 is respectively connected to the anode of the diode D5 and the first end of the switch tube Q4, the second end of the switch tube Q4 is grounded, the control end of the switch tube Q4 is used to receive a PWM control signal, the cathode of the diode D5 is grounded through the capacitor C7, and the cathode of the diode D5 is connected to the first end of the switch tube Q3.

[0022] In an exemplary embodiment of the present disclosure, the boost module further includes: an operational amplifier U2, a switch tube Q6 and a resistor R6;

[0023] The first end of the resistor R6 is connected to the second power supply end of the relay K2, and the second end of the resistor R6 is grounded;

[0024] The control end of the switch tube Q6 is connected to the first end of the resistor R6, the first end of the switch tube Q6 is connected to the second end of the voltage detection module, the second end of the switch tube Q6 is connected to the non-inverting input end of the operational amplifier U2, the inverting input end of the operational amplifier U2 is connected to the signal generator, the output end of the operational amplifier U2 is used to output a PWM control signal, and the output end of the operational amplifier U2 is connected to the control end of the switch tube Q4.

[0025] In an exemplary embodiment of the present disclosure, a switch module is also included;

[0026] The switch module includes a key switch K1;

[0027] The first end of the key switch K1 is used to connect to a charging power source, and the second end of the key switch K1 is respectively connected to the first end of the voltage detection module and the first end of the switching module.

[0028] The beneficial effects of the energy storage battery pack safety protection system provided by the embodiment of the present disclosure are as follows: the embodiment realizes precise control of the charging current through the linkage between the triode, the resistor and the switch tube, which can not only provide fast charging for the battery pack in the early stage, but also automatically slow down the charging speed until it stops completely when the battery is close to full charge, effectively avoiding the risk of battery overcharging. This not only prolongs the service life of the battery pack, but also reduces the potential safety hazards caused by overcharging. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present disclosure. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0030] Figure 1 It is a structural block diagram of a safety protection system for an energy storage battery pack provided by an embodiment of the present disclosure;

[0031] Figure 2 It is a circuit diagram of a safety protection system for an energy storage battery pack provided in an embodiment of the present disclosure. DETAILED DESCRIPTION

[0032] In order to enable people in the technical field to better understand the present solution, the technical solution in the embodiment of the present solution will be clearly described below in conjunction with the drawings in the embodiment of the present solution. Obviously, the described embodiment is an embodiment of a part of the present solution, not all of the embodiments. Based on the embodiments in the present solution, all other embodiments obtained by ordinary technicians in the field without creative work should fall within the scope of protection of the present solution.

[0033] The term "including" and any other variations in the specification and claims of this solution and the above drawings mean "including but not limited to", and is intended to cover non-exclusive inclusions and is not limited to the examples listed in the text. In addition, the terms "first" and "second" are used to distinguish different objects, not to describe a specific order.

[0034] The following is a detailed description of the implementation of the present disclosure in conjunction with the specific drawings:

[0035] Figure 1 This is a structural block diagram of a safety protection system for an energy storage battery pack provided by an embodiment of the present disclosure. Figure 1The energy storage battery pack safety protection system includes: a charging protection module; the first end of the charging protection module is used to connect the charging power supply, and the second end of the charging protection module is used to connect the battery pack; the charging protection module includes a transistor Q1, a resistor R1, a switch tube Q3, a transistor Q2, a resistor R2, a switch tube Q3 and a diode D2; the emitter of the transistor Q1 is used to connect the charging power supply, the collector of the transistor Q1 is grounded through the resistor R1, the base of the transistor Q1 is connected to the collector of the transistor Q1, the base of the transistor Q1 is connected to the base of the transistor Q2, the emitter of the transistor Q2 is used to connect the positive electrode of the battery pack, the collector of the transistor Q2 is grounded through the resistor R2, and the negative electrode of the battery pack is grounded; the collector of the transistor Q2 is connected to the control end of the switch tube Q3, the first end of the switch tube Q3 is connected to the emitter of the transistor Q1, the second end of the switch tube Q3 is connected to the anode of the diode D2, and the cathode of the diode D2 is used to connect the positive electrode of the battery pack.

[0036] In this embodiment, the charging protection module is used to charge the battery pack quickly and safely, and can avoid overcharging of the battery pack.

[0037] like Figure 2 As shown, the battery pack in this embodiment is represented by E1. When charging the battery pack E1, the charging power supply must be turned on first. It is assumed that the power inside the battery pack E1 has been exhausted before charging. After power-on, the transistor Q1 is turned on, and a voltage signal is generated on the resistor R1. At this time, the voltage on the battery pack E1 is lower than the voltage on the resistor R1, the transistor Q2 is turned off, and the voltage on the resistor R2 is 0 (that is, the voltage at the control end of the switch tube Q3 is 0). The switch tube Q3 in this embodiment can be a P-channel enhancement type field effect transistor. Therefore, after power-on, the switch tube Q3 is saturated and turned on (that is, the switch tube Q3 works in a switching state). At this time, the charging power supply passes through the switch tube Q3 and the diode D2 to quickly charge the battery pack E1. The voltage on the battery pack E1 gradually rises. When the voltage on the battery pack E1 is greater than the voltage on the resistor R1, the transistor Q2 is turned on, and a voltage is generated on the resistor R2. The voltage is added to the control end of the switch tube Q3. The voltage on the resistor R2 increases as the voltage on the battery pack E1 rises. The working state of the switch tube Q3 changes from the switch state to the amplification state according to the voltage change on the resistor R2. When the switch tube Q3 works in the amplification state, the charging current flowing through the switch tube Q3 decreases as the voltage at the control end increases. As the charging current decreases, the charging speed of the battery pack E1 slows down, thereby protecting the battery pack E1. When the voltage of the battery pack E1 reaches the set value, the switch tube Q3 changes from the amplification state to the cut-off state, the switch tube Q3 is cut off, and the battery pack E1 stops charging, thereby avoiding the phenomenon of overcharging of the battery pack and improving the service life of the battery pack.

[0038] It can be concluded from the above that this embodiment realizes precise control of charging current through the linkage between transistor Q1, resistor R1, switch tube Q3, transistor Q2, resistor R2 and switch tube Q3, which can not only provide fast charging for the battery pack in the early stage, but also automatically slow down the charging speed until it stops completely when the battery is close to full charge, effectively avoiding the risk of battery overcharging. This not only prolongs the service life of the battery pack, but also reduces the potential safety hazards caused by overcharging.

[0039] like Figure 1 As shown, in one embodiment of the present disclosure, it also includes: a voltage detection module, a comparison module, a switching module and a boost module; the first end of the voltage detection module is used to connect to the charging power supply, the second end of the voltage detection module is connected to the first end of the comparison module, and the second end of the comparison module is connected to the control end of the switching module; the first end of the switching module is used to connect to the charging power supply, the second end of the switching module is connected to the first end of the charging protection module, the third end of the switching module is connected to the first end of the boost module, and the second end of the boost module is connected to the first end of the charging protection module.

[0040] In actual applications, the charging power supply may have unstable voltage. If the charging power supply is too low, not only can the battery pack E1 not be charged normally, but it may also affect the battery pack. For example, if the battery pack E1 is charged at a low voltage for a long time, the chemical reaction inside the battery pack E1 may not be complete, and by-products may be generated, which will affect the battery performance and service life.

[0041] In order to ensure that a safe and stable charging environment can be provided for the battery pack under different charging power supply voltage conditions, in this embodiment, a voltage detection module, a comparison module, a switching module and a boost module are added.

[0042] In this embodiment, the voltage detection module is used to monitor the voltage of the charging power supply in real time. When the charging power supply is connected, the voltage detection module can accurately obtain the current voltage value of the charging power supply and pass the voltage information to the comparison module. The first end of the comparison module receives the charging power supply voltage information from the voltage detection module. A reference voltage value is preset inside the comparison module, and the received charging power supply voltage is compared with the reference voltage value. If the charging power supply voltage is higher or lower than the reference voltage value, the comparison module can output a corresponding control signal to the control end of the switching module. When the charging power supply voltage is normal, the switching module directly connects the charging power supply to the charging protection module so that the charging power supply can charge the battery pack E1 normally. When the comparison module detects that the charging power supply voltage is lower than the minimum charging voltage of the battery pack, the switching module switches to the path connected to the boost module according to the control signal, and connects the boost module to the charging circuit. When the switching module connects the boost module to the charging circuit, the boost module boosts the voltage of the charging power supply. The boosted voltage is transmitted to the charging protection module to ensure that even if the charging power supply voltage is abnormal, a suitable charging voltage can be provided to the battery pack to ensure safe charging of the battery pack.

[0043] It can be concluded from the above that this embodiment realizes intelligent monitoring and adjustment of the charging power supply voltage by integrating the voltage detection module, the comparison module, the switching module and the boost module, ensuring that a stable and safe charging environment can be provided for the battery pack E1 under different voltage conditions, effectively preventing the damage to the battery performance caused by low-voltage charging, extending the battery life, and improving the safety and reliability of the charging process.

[0044] like Figure 2 As shown, in one embodiment of the present disclosure, the comparison module includes: an operational amplifier U1; the non-inverting input terminal of the operational amplifier U1 is connected to the second end of the voltage detection module, the inverting input terminal of the operational amplifier U1 is connected to the reference voltage, and the output terminal of the operational amplifier U1 is connected to the control terminal of the switching module.

[0045] In this embodiment, the operational amplifier U1 constitutes a comparator, and the operational amplifier U1 can receive the voltage signal of the charging power supply monitored in real time by the voltage detection module. The voltage detection module converts the actual voltage value of the charging power supply into an electrical signal suitable for processing by the operational amplifier and inputs it into the non-inverting input terminal of the operational amplifier U1. The inverting input terminal of the operational amplifier U1 is connected to a fixed reference voltage. The reference voltage can be pre-set according to the requirements of safe charging of the battery pack. The output terminal of the operational amplifier U1 is connected to the control terminal of the switching module. If the charging power supply voltage is higher than the reference voltage, the operational amplifier U1 outputs a high level; if the charging power supply voltage is lower than the reference voltage, the operational amplifier outputs a low level.

[0046] The operational amplifier U1 compares the charging power supply voltage with the reference voltage and outputs a control signal to the switching module, thereby automatically adjusting the charging path according to the state of the charging power supply voltage to ensure that the battery pack is charged under safe voltage conditions.

[0047] like Figure 2 As shown, in one embodiment of the present disclosure, the comparison module also includes: a voltage regulator tube D4 and a variable resistor RP1; the first end of the variable resistor RP1 is connected to the VCC power supply, the second end of the variable resistor RP1 is grounded, the sliding end of the variable resistor RP1 is connected to the inverting input end of the operational amplifier U1, the cathode of the voltage regulator tube D4 is connected to the inverting input end of the operational amplifier U1, and the anode of the voltage regulator tube D4 is grounded.

[0048] In this embodiment, the first end of the variable resistor RP1 is connected to the VCC power supply, and the sliding end of the variable resistor RP1 is connected to the inverting input end of the operational amplifier U1. By adjusting the sliding end position of the variable resistor RP1, the voltage value input to the inverting input end of the operational amplifier U1 can be changed. This allows the reference voltage to be adjusted within a certain range to adapt to different charging requirements and battery pack characteristics. For example, the variable resistor RP1 can be adjusted to obtain a suitable reference voltage according to the charging voltage requirements of different battery packs. The function of the voltage regulator D4 is to keep the voltage at the inverting input end of the operational amplifier U1 relatively stable when the input voltage fluctuates. When the voltage in the charging power supply or other circuits fluctuates, the voltage regulator D4 can prevent the inverting input voltage of the operational amplifier U1 from being greatly affected, thereby improving the stability and reliability of the comparison module. Ensure that the comparison module can accurately compare the charging power supply voltage with the relatively stable reference voltage under different working conditions, and then output the correct control signal to the switching module.

[0049] like Figure 2 As shown, in one embodiment of the present disclosure, the voltage detection module includes a resistor R4, a resistor R3 and a capacitor C6; the first end of the resistor R4 is used to connect the charging voltage, the second end of the resistor R4 is grounded through the resistor R3, the second end of the resistor R4 is connected to the in-phase input terminal of the operational amplifier U1, and the capacitor C6 is connected in parallel with the resistor R3.

[0050] In this embodiment, resistor R4 and resistor R3 form a voltage divider circuit. When the charging power supply is connected, the voltage of the charging power supply is distributed on resistors R4 and R3 according to the voltage division principle. The voltage on resistor R3 is transmitted to the non-inverting input terminal of the operational amplifier U1 as the actual charging power supply voltage signal compared with the reference voltage. Capacitor C6 can effectively filter out high-frequency noise and interference signals in the charging power supply, making the voltage input to the non-inverting input terminal of the operational amplifier U1 more stable and accurate.

[0051] It can be concluded from the above that the voltage detection module of this embodiment converts the voltage of the charging power supply into a signal suitable for processing by the operational amplifier through the voltage division effect of the resistors R4 and R3, and improves the quality and stability of the input signal through the filtering effect of the capacitor C6, thereby providing a reliable basis for the comparison module to accurately judge the state of the charging power supply.

[0052] like Figure 2 As shown, in one embodiment of the present disclosure, the switching module includes: a transistor Q5 and a relay K2; the base of the transistor Q5 is connected to the output end of the operational amplifier U1, the emitter of the transistor Q5 is connected to the VCC power supply, the collector of the transistor Q5 is connected to the first power supply end of the relay K2, the second power supply end of the relay K2 is grounded, the first end of the relay K2 is used to connect the charging power supply, the second end of the relay K2 is connected to the first end of the charging protection module, and the third end of the relay K2 is connected to the first end of the boost module.

[0053] In this embodiment, the base of transistor Q5 is connected to the output terminal of operational amplifier U1. According to the comparison result between the charging power supply voltage and the reference voltage, operational amplifier U1 outputs a high level or low level signal to the base of transistor Q5. When operational amplifier U1 outputs a high level signal, transistor Q5 is turned off; when operational amplifier U1 outputs a low level signal, transistor Q5 is turned on.

[0054] The second end (normally closed end) of the relay K2 is connected to the first end of the charging protection module, and the third end (normally open end) of the relay K2 is connected to the first end of the boost module.

[0055] If the charging power supply is normal, the operational amplifier U1 outputs a high-level control signal, the transistor Q5 is cut off, the relay K2 is not energized, and its normally closed end is connected to the charging protection module. At this time, the charging power supply is directly connected to the charging protection module to charge the battery pack normally.

[0056] If the charging power supply voltage is abnormal, the operational amplifier U1 outputs a low-level control signal, and the transistor Q5 is turned on to energize the relay K2. The first terminal of the relay K2 is connected to the third terminal of the relay K2 (the normally open end is closed), so that the charging power supply is boosted before charging the battery pack.

[0057] It can be concluded from the above that the switching module of this embodiment automatically switches the charging path according to the output signal of the comparison module through the cooperation of the transistor Q5 and the relay K2, thereby ensuring that a suitable charging method can be provided for the battery pack under different charging power supply voltage conditions, thereby improving the reliability and adaptability of the energy storage battery pack safety protection system.

[0058] like Figure 2As shown, in one embodiment of the present disclosure, the boost module includes: an inductor L1, a switch tube Q4, a diode D5 and a capacitor C7; the first end of the inductor L1 is connected to the third end of the switching module, the second end of the inductor L1 is respectively connected to the anode of the diode D5 and the first end of the switch tube Q4, the second end of the switch tube Q4 is grounded, the control end of the switch tube Q4 is used to receive a PWM control signal, the cathode of the diode D5 is grounded through the capacitor C7, and the cathode of the diode D5 is connected to the first end of the switch tube Q3.

[0059] In this embodiment, the inductor L1, the switch tube Q4, the diode D5 and the capacitor C7 form a boost circuit, and the control end of the switch tube Q4 is used to receive a PWM control signal. By adjusting the duty cycle of the PWM signal, the on and off time of the switch tube Q4 can be controlled.

[0060] When the PWM signal turns on the switch tube Q4, the inductor L1 stores energy; when the switch tube Q4 is turned off, the inductor L1 generates a reverse electromotive force, and the energy in the charging power supply and the inductor L1 is released to the battery pack at the same time. Capacitor C7 plays a filtering role, smoothing the output voltage, reducing voltage fluctuations, and providing a relatively stable boosted charging voltage for the battery pack. Among them, the diode D5 plays a rectifying role, allowing only current to flow from the inductor L1 to the capacitor C7 and the battery pack, preventing the current from flowing back to the input power supply or other parts.

[0061] It can be concluded from the above that the boost module in this embodiment charges the battery pack after boosting the input voltage through the energy storage and release of the inductor L1, the controlled conduction and cutoff of the switch tube Q4, the rectification of the diode D5 and the filtering of the capacitor C7, ensuring that when the charging power supply voltage is abnormal, it can still provide a suitable charging voltage for the battery pack, thereby improving the reliability and adaptability of the energy storage battery pack safety protection system.

[0062] like Figure 2 As shown, in one embodiment of the present disclosure, the boost module also includes: an operational amplifier U2, a switch tube Q6 and a resistor R6; the first end of the resistor R6 is connected to the second power supply end of the relay K2, and the second end of the resistor R6 is grounded; the control end of the switch tube Q6 is connected to the first end of the resistor R6, the first end of the switch tube Q6 is connected to the second end of the voltage detection module, the second end of the switch tube Q6 is connected to the in-phase input end of the operational amplifier U2, the inverting input end of the operational amplifier U2 is connected to the signal generator, the output end of the operational amplifier U2 is used to output a PWM control signal, and the output end of the operational amplifier U2 is connected to the control end of the switch tube Q4.

[0063] In this embodiment, the operational amplifier U2, the switch tube Q6 and the resistor R6 constitute a PWM signal generating circuit. When the charging power supply is normal, the relay K2 is not energized, the voltage on the resistor R6 is 0, the switch tube Q6 is turned off, the output of the operational amplifier U2 is low level, and the boost module does not work, wherein the operational amplifier U2 constitutes a comparator. When the charging power supply is lower than the set value, the relay K2 is energized, a voltage signal is generated on the resistor R6, the switch tube Q6 is saturated and turned on, and the operational amplifier U2 receives the voltage signal on the resistor R3. The inverting input terminal of the operational amplifier U2 is connected to the signal generator. In this embodiment, the signal generator can generate a triangular wave, a sawtooth wave, and a sine wave, etc. In this embodiment, the triangular wave is taken as an example. The operational amplifier U2 compares the voltage on the resistor R3 with the triangular wave signal and outputs a PWM control signal. The switch tube Q4 boosts the charging power supply under the action of the PWM control signal. By changing the duty cycle of the PWM control signal, the output voltage of the boost module can be changed, thereby ensuring that the boosted charging voltage meets the charging requirements of the battery pack.

[0064] In this embodiment, the boost module can change the duty cycle of the PWM control signal output by the op amp U2 according to the voltage on the resistor R3. When the voltage on the resistor R3 is too high, the high level time of the PWM control signal output by the op amp U2 is short, the on-time of the switch tube Q4 is short, and the voltage output by the boost module is small. When the voltage on the resistor R3 is too low, the high level time of the PWM control signal output by the op amp U2 is long, the on-time of the switch tube Q4 is long, and the voltage output by the boost module is large.

[0065] It can be concluded from the above that when the boost module in this embodiment is working, it changes the duty cycle of the PWM control signal and the on and off time of the switch tube Q4 by real-time detecting the voltage of the voltage detection module, thereby changing the output voltage of the boost module to ensure that the boosted charging voltage meets the charging requirements of the battery pack.

[0066] like Figure 2 As shown, in one embodiment of the present disclosure, a switch module is also included; the switch module includes a key switch K1; the first end of the key switch K1 is used to connect to the charging power supply, and the second end of the key switch K1 is respectively connected to the first end of the voltage detection module and the first end of the switching module.

[0067] In this embodiment, a key switch K1 is also added. When the key switch K1 is pressed, the charging power supply is connected to the voltage detection module and the switching module. At this time, the voltage detection module starts to detect the voltage of the charging power supply and transmits the detected voltage signal to the comparison module. The switching module decides whether to connect the charging power supply directly to the charging protection module or to the charging protection module through the boost module based on the output signal of the comparison module. When the key switch K1 is pressed again or disconnected, the connection between the charging power supply and the subsequent circuit module is cut off. The voltage detection module, the comparison module, the switching module, the boost module, etc. stop working, and the charging process is terminated.

[0068] In this embodiment, the key switch K1 in the switch module provides a simple and effective manual control method for the entire energy storage battery pack safety protection system. The user can turn on or off the charging process by operating the key switch K1, thereby improving the convenience and safety of the system.

[0069] The above embodiments are only used to illustrate the technical solutions of the present disclosure, rather than to limit them. Although the present disclosure has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present disclosure.

Claims

1. A safety protection system for energy storage battery packs, characterized in that: include: Charging protection module; The first end of the charging protection module is used to connect to a charging power source, and the second end of the charging protection module is used to connect to a battery pack; The charging protection module is used to charge the battery pack quickly and safely, and is also used to prevent the battery pack from being overcharged; The charging protection module includes a transistor Q1, a resistor R1, a switch tube Q3, a transistor Q2, a resistor R2, a switch tube Q3 and a diode D2; The emitter of the transistor Q1 is used to connect to a charging power source, the collector of the transistor Q1 is grounded through the resistor R1, the base of the transistor Q1 is connected to the collector of the transistor Q1, the base of the transistor Q1 is connected to the base of the transistor Q2, the emitter of the transistor Q2 is used to connect to the positive electrode of the battery pack, the collector of the transistor Q2 is grounded through the resistor R2, and the negative electrode of the battery pack is grounded; The collector of the transistor Q2 is connected to the control end of the switch tube Q3, the first end of the switch tube Q3 is connected to the emitter of the transistor Q1, the second end of the switch tube Q3 is connected to the anode of the diode D2, and the cathode of the diode D2 is used to connect to the positive electrode of the battery pack.

2. The energy storage battery pack safety protection system according to claim 1, characterized in that: Also includes: Voltage detection module, comparison module, switching module and boost module; The first end of the voltage detection module is used to connect to the charging power supply, the second end of the voltage detection module is connected to the first end of the comparison module, and the second end of the comparison module is connected to the control end of the switching module; The first end of the switching module is used to connect to the charging power supply, the second end of the switching module is connected to the first end of the charging protection module, the third end of the switching module is connected to the first end of the boost module, and the second end of the boost module is connected to the first end of the charging protection module.

3. The energy storage battery pack safety protection system according to claim 2, characterized in that: The comparison module includes: an operational amplifier U1; The non-inverting input terminal of the operational amplifier U1 is connected to the second terminal of the voltage detection module, the inverting input terminal of the operational amplifier U1 is connected to the reference voltage, and the output terminal of the operational amplifier U1 is connected to the control terminal of the switching module.

4. The energy storage battery pack safety protection system according to claim 3, characterized in that: The comparison module also includes: a voltage regulator tube D4 and a variable resistor RP1; The first end of the variable resistor RP1 is connected to the VCC power supply, the second end of the variable resistor RP1 is grounded, the sliding end of the variable resistor RP1 is connected to the inverting input end of the operational amplifier U1, the cathode of the voltage regulator D4 is connected to the inverting input end of the operational amplifier U1, and the anode of the voltage regulator D4 is grounded.

5. The energy storage battery pack safety protection system according to claim 3, characterized in that: The voltage detection module includes a resistor R4, a resistor R3 and a capacitor C6; The first end of the resistor R4 is used to connect to the charging voltage, the second end of the resistor R4 is grounded through the resistor R3, the second end of the resistor R4 is connected to the non-inverting input terminal of the operational amplifier U1, and the capacitor C6 is connected in parallel with the resistor R3.

6. The energy storage battery pack safety protection system according to claim 3, characterized in that: The switching module includes: a transistor Q5 and a relay K2; The base of the transistor Q5 is connected to the output end of the operational amplifier U1, the emitter of the transistor Q5 is connected to the VCC power supply, the collector of the transistor Q5 is connected to the first power supply end of the relay K2, the second power supply end of the relay K2 is grounded, the first end of the relay K2 is used to connect to the charging power supply, the second end of the relay K2 is connected to the first end of the charging protection module, and the third end of the relay K2 is connected to the first end of the boost module.

7. The energy storage battery pack safety protection system according to claim 6, characterized in that: The boost module includes: an inductor L1, a switch tube Q4, a diode D5 and a capacitor C7; The first end of the inductor L1 is connected to the third end of the switching module, the second end of the inductor L1 is respectively connected to the anode of the diode D5 and the first end of the switch tube Q4, the second end of the switch tube Q4 is grounded, the control end of the switch tube Q4 is used to receive a PWM control signal, the cathode of the diode D5 is grounded through the capacitor C7, and the cathode of the diode D5 is connected to the first end of the switch tube Q3.

8. The energy storage battery pack safety protection system according to claim 7, characterized in that: The boost module also includes: an operational amplifier U2, a switch tube Q6 and a resistor R6; The first end of the resistor R6 is connected to the second power supply end of the relay K2, and the second end of the resistor R6 is grounded; The control end of the switch tube Q6 is connected to the first end of the resistor R6, the first end of the switch tube Q6 is connected to the second end of the voltage detection module, the second end of the switch tube Q6 is connected to the non-inverting input end of the operational amplifier U2, the inverting input end of the operational amplifier U2 is connected to the signal generator, the output end of the operational amplifier U2 is used to output a PWM control signal, and the output end of the operational amplifier U2 is connected to the control end of the switch tube Q4.

9. The energy storage battery pack safety protection system according to claim 2, characterized in that: Also included is a switch module; The switch module includes a key switch K1; The first end of the key switch K1 is used to connect to a charging power source, and the second end of the key switch K1 is respectively connected to the first end of the voltage detection module and the first end of the switching module.

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