A protection circuit and energy storage power supply

Abstract

The utility model relates to the technical field of energy storage power supply mainly provides a protection circuit and energy storage power supply, and protection circuit includes switch module and protection module, switch module is connected with protection module, and switch module is still used for connecting with power supply and battery respectively, and protection module is still connected with battery. Switch module is used for receiving the output current of power supply, and is switched on based on output current, to output output current to battery, thereby charging battery. In the process of charging battery, protection unit will detect the temperature of battery in real time to judge whether the battery appears over temperature phenomenon. When the temperature of battery is greater than the preset threshold value, it is determined that the battery temperature is too high, at this moment, the protection module will output the first control signal to the switch module, so that the switch module is turned off, thereby stopping charging battery, and further, while avoiding the safety accident caused by the high temperature of battery, the service life of battery is improved.

Description

Technical Field

[0001] This utility model relates to the technical field of energy storage power supplies, and in particular to a protection circuit and an energy storage power supply. Background Technology

[0002] In battery applications, the temperature rise of batteries during charging is a common phenomenon. Due to factors such as internal electrochemical reactions, resistance-induced heat generation, and polarization, batteries continuously generate heat during charging.

[0003] While current technologies have made some progress in battery charging management, it is still difficult to completely prevent batteries from overheating during charging. If effective measures are not taken in time to reduce battery temperature, prolonged high-temperature charging will not only significantly shorten battery cycle life and reduce charging and discharging efficiency and range, but may also cause battery bulging, leakage, and even thermal runaway, leading to serious safety accidents such as fires and explosions. Therefore, to improve battery safety and lifespan, it is necessary to provide a protection circuit. Utility Model Content

[0004] This utility model provides a protection circuit and an energy storage power supply, aiming to solve the technical problems of low battery life and low safety in existing energy storage power supplies.

[0005] To solve the above-mentioned technical problems, one technical solution adopted by this utility model is to provide a protection circuit, which includes a switching module and a protection module.

[0006] The switch module is connected to the protection module, and the switch module is also used to connect to the power supply and the battery respectively, and the protection module is also connected to the battery;

[0007] The switching module is used to receive the output current of the power supply and turn on based on the output current to output the output current to the battery, thereby charging the battery;

[0008] The protection module is used to detect the temperature of the battery in real time during the battery charging process, and output a first control signal to the switch module when the battery temperature is greater than a preset threshold, so as to turn off the switch module and stop charging the battery.

[0009] Optionally, the protection module includes a temperature detection unit and a protection unit;

[0010] The temperature detection unit is connected to the switch module and the battery respectively, and the protection unit is connected to the temperature detection unit and the switch module respectively;

[0011] The temperature detection unit is used to detect the temperature of the battery in real time during the battery charging process and receive the output current, so as to output a corresponding voltage signal to the protection unit based on the output current and the temperature of the battery;

[0012] The protection unit is used to receive the voltage signal and start working based on the voltage signal when the temperature of the battery is greater than a preset threshold, thereby outputting a first control signal to the switch module to turn off the switch module.

[0013] Optionally, the temperature detection unit includes a thermistor and a voltage divider subunit;

[0014] The thermistor is connected to the battery, and the thermistor is also connected to the voltage divider unit. The voltage divider unit is connected to the switch module and the protection unit respectively.

[0015] The voltage divider subunit is used to receive the output current of the power supply when the switching module is turned on, and convert the output current into a corresponding voltage signal and then divide the voltage signal to output the corresponding voltage signal to the protection unit.

[0016] The thermistor responds to the temperature change of the battery and adjusts the voltage division ratio of the voltage signal in real time based on the battery temperature, so that the protection unit starts to work according to the voltage signal when the battery temperature is greater than a preset threshold.

[0017] Optionally, the protection unit includes a resistor R11, a switching transistor Q4, and a Zener diode D1;

[0018] The control terminal of the switching transistor Q4 is connected to the temperature detection unit through the resistor R11. The first terminal of the switching transistor Q4 is connected to the switching module, and the second terminal of the switching transistor Q4 is connected to the cathode of the Zener diode D1. The anode of the Zener diode D1 is used for grounding.

[0019] Optionally, the protection module further includes an overcurrent detection unit;

[0020] The overcurrent detection unit is connected to the protection unit, and the overcurrent detection unit is also used to connect to the power supply.

[0021] The overcurrent detection unit is used to detect the output current of the power supply in real time when the switching module is turned on, and output a drive signal to the protection unit when the output current is greater than the current threshold, so that the protection unit can start working.

[0022] Optionally, the overcurrent detection unit includes a switching transistor Q5, a diode D2, and a resistor R9;

[0023] The control terminal of the switching transistor Q5 is connected to the switching module through the resistor R9. The first terminal of the switching transistor Q5 is connected to the switching module, the second terminal of the switching transistor Q5 is connected to the anode of the diode D2, and the cathode of the diode D2 is connected to the protection unit.

[0024] Optionally, the protection circuit may further include a detection module;

[0025] The detection module is connected to the switch module, and the detection module is also used to connect to the power supply.

[0026] The detection module is used to detect the power supply voltage of the power supply, and outputs a second control signal to the switch module when the power supply voltage is greater than a preset voltage, so as to turn on the switch module.

[0027] Optionally, the detection module includes a voltage regulator U1, a switching transistor Q2, a resistor R2, a resistor R5, a resistor R6, and a resistor R7;

[0028] The reference input terminal of the voltage regulator U1 is connected to the power supply through the resistor R6. The reference input terminal of the voltage regulator U1 is also grounded through the resistor R7. The cathode of the voltage regulator U1 is connected to the control terminal of the switching transistor Q2 through the resistor R5. The anode of the voltage regulator U1 is grounded. The first terminal of the switching transistor Q2 is connected to the power supply. The first terminal of the switching transistor Q2 is also connected to the resistor R5 through the resistor R2. The second terminal of the switching transistor Q2 is connected to the switching module.

[0029] Optionally, the switching module includes a switching transistor Q1, a switching transistor Q3, a resistor R3, a resistor R10, and a resistor R1;

[0030] The control terminal of the switch Q3 is connected to the power supply through the resistor R10. The control terminal of the switch Q3 is also connected to the protection module through the resistor R3. The first terminal of the switch Q3 is connected to the power supply through the resistor R1. The second terminal of the switch Q3 is connected to the control terminal of the switch Q1. The first terminal of the switch Q1 is connected to the power supply. The second terminal of the switch Q1 is connected to the protection module and the battery, respectively.

[0031] To solve the above-mentioned technical problems, another technical solution adopted in this utility model embodiment is: to provide an energy storage power source, the energy storage power source comprising:

[0032] Batteries; and

[0033] The protection circuit described above.

[0034] Unlike related technologies, this utility model provides a protection circuit and an energy storage power supply. The protection circuit includes a switch module and a protection module. The switch module is connected to the protection module and is also connected to a power supply and a battery. The protection module is also connected to the battery. The switch module receives the output current from the power supply and conducts based on the output current to output the current to the battery, thereby charging the battery. During battery charging, the protection unit monitors the battery temperature in real time to determine if the battery is overheating. When the battery temperature exceeds a preset threshold, it is determined that the battery temperature is too high. At this time, the protection module outputs a first control signal to the switch module to turn off the switch module, thereby stopping the charging of the battery. This avoids safety accidents caused by overheating and improves the battery's lifespan. Attached Figure Description

[0035] One or more embodiments are illustrated by way of example with reference to the accompanying drawings. These illustrations do not constitute a limitation on the embodiments. Elements having the same reference numerals in the drawings are denoted as similar elements. Unless otherwise stated, the figures in the drawings are not to be limited by scale.

[0036] Figure 1 This is a schematic diagram of an application scenario provided by an embodiment of the present utility model;

[0037] Figure 2 This is a structural block diagram of a protection circuit provided in an embodiment of the present utility model;

[0038] Figure 3 This is a circuit diagram of a protection circuit provided in an embodiment of this utility model. Detailed Implementation

[0039] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this utility model and are not intended to limit this utility model.

[0040] The technical features involved in the various embodiments of this application described below do not conflict with each other and can be combined with each other.

[0041] When an element is described as "connected" to another element, it can be directly connected to the other element, or there may be one or more intervening elements between them.

[0042] The terms "first," "second," etc., used in the specification and claims of this utility model are used to distinguish similar objects and are not used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that embodiments of this application can be implemented in orders other than those illustrated or described herein, and the objects distinguished by "first," "second," etc., are generally of the same class and the number of objects is not limited; for example, the first object can be one or more.

[0043] Unless otherwise defined, all technical and scientific terms used in this specification have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to limit the scope of the invention. The term "and / or" as used in this specification includes any and all combinations of one or more of the associated listed items.

[0044] Please see Figure 1 , Figure 1 This is a schematic diagram of an application scenario provided by an embodiment of the present utility model, such as... Figure 1 As shown, the application scenario 1 includes an energy storage power supply 100 and a power supply 200; the energy storage power supply 100 is connected to the power supply 200. Wherein, as... Figure 1 As shown, the energy storage power supply 100 includes a battery 10, which is connected to the power supply 200. The battery 10 receives the output current from the power supply 200 and begins charging based on the output current. It should be noted that during the charging process, the temperature of the battery 10 will gradually rise. If the battery 10 is still being charged during this time, it will affect the lifespan of the battery 10.

[0045] Therefore, as Figure 1 As shown, the energy storage power supply 10 also includes a protection circuit 20, which is connected to both the battery 10 and the power supply 200. The protection circuit 20 receives the output current from the power supply 200 and charges the battery 10 based on this output current. During the charging process, the protection circuit 20 also monitors the battery temperature in real time and shuts off the output when the battery temperature exceeds a preset threshold, thus stopping charging the battery 10. After charging stops, the battery temperature slowly decreases, preventing the battery from operating continuously at high temperatures and improving the reliability of the energy storage power supply 100.

[0046] In some embodiments, please refer to Figure 2 , Figure 2 This is a structural block diagram of a protection circuit provided in an embodiment of this utility model, as shown below. Figure 2 As shown, the protection circuit 20 includes a switch module 21 and a protection module 22;

[0047] The switch module 21 is connected to the protection module 22. The switch module 21 is also used to connect to the power supply 200 and the battery 10 respectively. The protection module 22 is also connected to the battery 10.

[0048] The switching module 21 is used to receive the output current of the power supply 200 and conduct based on the output current to output the output current to the battery 10, thereby charging the battery 10.

[0049] The protection module 22 is used to detect the temperature of the battery 10 in real time during the charging process of the battery 10, and output a first control signal to the switch module 21 when the temperature of the battery 10 is greater than a preset threshold, so as to turn off the switch module 21 and stop charging the battery 10.

[0050] Specifically, when the energy storage power supply 100 is connected to the power supply 200, the switching module 21 will turn on based on the output current of the power supply 200, thereby inputting the output current of the power supply 200 to the battery 10 to charge the battery 10. During the charging process of the battery 10, the protection module 22 will monitor the battery temperature of the battery 10 in real time and determine whether the temperature of the battery 10 exceeds a preset threshold. If the temperature of the battery 10 is greater than the preset threshold, it is considered that the temperature of the battery 10 is too high. At this time, the protection module 22 will output a first control signal to the switching module 21, so that the switching module 21 will turn off based on the first control signal, thereby stopping the charging of the battery 10. If the temperature of the battery 10 does not exceed the preset threshold, the protection module 22 will not output the first control signal, and the switching module 21 will continue to charge the battery 10.

[0051] In some embodiments, such as Figure 2 As shown, the protection module 22 includes a temperature detection unit 221 and a protection unit 222;

[0052] The temperature detection unit 221 is connected to the switch module 21 and the battery 10 respectively, and the protection unit 222 is connected to the temperature detection unit 221 and the switch module 21 respectively;

[0053] The temperature detection unit 221 is used to detect the temperature of the battery 10 in real time during the charging process of the battery 10 and receive the output current, so as to output a corresponding voltage signal to the protection unit 222 based on the output current and the temperature of the battery 10.

[0054] The protection unit 222 is used to receive the voltage signal and start working based on the voltage signal when the temperature of the battery 10 is greater than a preset threshold, thereby outputting a first control signal to the switch module 21 to turn off the switch module 21.

[0055] During the charging process of the power supply 200 to the battery 10 via the switching module 21, the temperature detection unit 221 receives the output current of the power supply 200 and simultaneously detects the temperature of the battery 10 in real time. Upon receiving the output current from the power supply 200, it converts the output current into a corresponding voltage signal and adjusts the voltage signal in real time according to the detected temperature of the battery 10, thereby outputting a corresponding voltage signal to the protection unit 222. Upon receiving the corresponding voltage signal, the protection unit 222 determines whether the voltage signal is greater than a voltage threshold, which is set based on a preset threshold. If the temperature of the battery 10 exceeds the preset threshold, the voltage signal will also exceed the voltage threshold.

[0056] If the temperature of the battery 10 is greater than the preset threshold, the protection unit 222 will start working based on the voltage signal, thereby outputting a first control signal to the switch module 21 to turn off the switch module 21 and stop charging the battery 10. If the voltage signal is less than the voltage threshold, it is considered that the temperature of the battery 10 is lower than the preset threshold. In this case, the protection unit 222 will not output the first control signal, and the battery 10 will maintain the charging state.

[0057] Furthermore, in another embodiment, such as Figure 2 As shown, the temperature detection unit 221 includes a thermistor RT1 and a voltage divider subunit 2211;

[0058] The thermistor RT1 is connected to the battery 10, and the thermistor RT1 is also connected to the voltage divider subunit 2211. The voltage divider subunit 2211 is connected to the switch module 21 and the protection unit 222 respectively.

[0059] The voltage divider subunit 2211 is used to receive the output current of the power supply 200 when the switch module 21 is turned on, and convert the output current into a corresponding voltage signal and then divide the voltage signal to output the corresponding voltage signal to the protection unit 222.

[0060] The thermistor RT1 responds to the temperature change of the battery 10 and adjusts the voltage division ratio of the voltage signal in real time based on the temperature of the battery 10, so that the protection unit 222 starts to work according to the voltage signal when the temperature of the battery 10 is greater than a preset threshold.

[0061] Specifically, when the switch module 21 is turned on, the output current of the power supply 200 is input to the battery 10 through the switch module 21. Simultaneously, the voltage divider subunit 2211 receives the output current. After receiving the output current, the voltage divider subunit 2211 converts the output current into a corresponding voltage signal, performs voltage division processing on the voltage signal, and finally inputs the voltage signal after voltage division to the protection unit 222. It should be noted that the thermistor RT1 is located close to the battery 10. As the temperature of the battery 10 slowly rises, the resistance of the thermistor RT1 changes with the temperature of the battery 10. As the resistance of the thermistor RT1 changes, the voltage division ratio of the voltage divider subunit 2211 also changes accordingly. When the temperature of the battery 10 exceeds a preset threshold, the voltage signal output by the voltage divider subunit 2211 will control the protection unit 222 to start working, thereby outputting a first control signal to turn off the switch module 21, thus stopping the charging of the battery 10.

[0062] It is known that when the temperature of the battery 10 is less than the preset threshold, the voltage signal output by the voltage divider subunit 2211 will be less than the voltage threshold. At this time, the protection unit 222 will not start working, thereby keeping the switch module 21 in the conducting state.

[0063] In some embodiments, the temperature detection unit 221 may also be a temperature sensor or other device for measuring temperature. When the temperature of the battery 10 exceeds the preset threshold, the temperature detection unit 221 controls the protection unit 222 to start working, thereby stopping the charging of the battery 10 and improving the reliability of the energy storage power supply 100.

[0064] In yet another embodiment, please refer to Figure 3 , Figure 3 This is a circuit diagram of the first type of protection circuit provided in this embodiment of the utility model, as shown below. Figure 3 As shown, the voltage divider subunit 2211 includes resistors R4 and R8; the protection unit 222 includes resistor R11, switching transistor Q4, and Zener diode D1.

[0065] The first end of the resistor R4 is connected to the switch module 21, the second end of the resistor R4 is connected to the protection unit 222 and the resistor R8 respectively, the resistor R4 is also connected in parallel with the thermistor RT1, and the resistor R8 is also used for grounding.

[0066] The control terminal of the switching transistor Q4 is connected to the temperature detection unit 221 through the resistor R11. The first terminal of the switching transistor Q4 is connected to the switching module 21, and the second terminal of the switching transistor Q4 is connected to the cathode of the Zener diode D1. The anode of the Zener diode D1 is used for grounding.

[0067] It should be noted that during the charging process of the power supply 200 for the battery 10, the power supply 200 will also discharge the battery 10, meaning that the output current of the power supply 200 will flow into the battery 10. When the battery 10 is charging, the output current will also flow into resistors R4 and R8, thereby generating corresponding voltage signals on resistors R4 and R8. Different voltage signals can be generated based on the resistance values ​​of resistors R4 and R8. Therefore, voltage division can be achieved through resistors R4 and R8. When resistors R4 and R8 generate corresponding voltage signals, the control terminal of the switch Q4 receives the voltage division value on resistor R8 and determines whether to conduct based on this value. It can be seen that since the second terminal of the switch Q4 is grounded through the Zener diode D1, the conduction voltage of the switch Q4 is the sum of the conduction voltage drop of the switch Q4 and the regulated voltage of the Zener diode D1.

[0068] It should be noted that the thermistor RT1 is a negative temperature coefficient thermistor, meaning that the resistance of thermistor RT1 decreases as the temperature increases. Specifically, when the battery 10 begins charging, its temperature is low, and the resistance of the thermistor RT1 is high, resulting in a small voltage drop across resistor R8, which in turn keeps the switch Q4 off. As the temperature of the battery 10 rises, the resistance of the thermistor RT1 decreases, and the voltage drop across resistor R8 slowly increases. When the temperature of the battery 10 exceeds a preset threshold, the voltage drop across resistor R8 also exceeds the voltage threshold (the sum of the on-state voltage drop of switch Q4 and the voltage regulation value of Zener diode D1), causing switch Q4 to turn on. Once switch Q4 is on, it outputs a first control signal to switch module 21, thereby controlling switch module 21 to turn off. It should be noted that the preset threshold is set based on the resistance values ​​of resistors R4 and R8. In other words, the over-temperature protection value of the battery 10 can be set by adjusting the resistance values ​​of resistors R4 and R8.

[0069] In some embodiments, such as Figure 3 As shown, the protection unit 222 also includes a light-emitting diode (LED2), which is connected to the resistor R3 and the first terminal of the switching transistor Q4. When the switching transistor Q4 is turned on, the LED2 lights up, thereby indicating that the battery 10 is overheated.

[0070] In another embodiment, such as Figure 3 As shown, the protection module 22 also includes a diode D3. The anode of the diode D3 is connected to the switch module 21, and the cathode of the diode D3 is connected to the battery 10. The diode D3 prevents current from the battery 10 from flowing back into the protection circuit 20.

[0071] In yet another embodiment, such as Figure 2 As shown, the protection module 22 also includes an overcurrent detection unit 223;

[0072] The overcurrent detection unit 223 is connected to the protection unit 222, and the overcurrent detection unit 223 is also used to connect to the power supply 200;

[0073] The overcurrent detection unit 223 is used to detect the output current of the power supply 200 in real time when the switch module 21 is turned on, and output a drive signal to the protection unit 222 when the output current is greater than the current threshold, so that the protection unit 222 starts to work.

[0074] When the power supply 200 charges the battery 10 through the switching module 21, the overcurrent detection unit 223 detects the output current of the power supply 200 and determines whether the output current is greater than a current threshold. If the output current is greater than the current threshold, a drive signal is output to the protection unit 222. At this time, the protection unit 222 starts working based on the drive signal, thereby controlling the switching module 21 to turn off and stop charging the battery 10. Based on this, the overcurrent detection unit 233 can prevent the energy storage power supply 100 from experiencing overcurrent, thereby protecting the battery 10.

[0075] In yet another embodiment, such as Figure 3 As shown, the overcurrent detection unit 223 includes a switching transistor Q5, a diode D2, and a resistor R9;

[0076] The control terminal of the switching transistor Q5 is connected to the switching module 21 through the resistor R9. The first terminal of the switching transistor Q5 is connected to the switching module 21, the second terminal of the switching transistor Q5 is connected to the anode of the diode D2, and the cathode of the diode D2 is connected to the protection unit 222.

[0077] When the power supply 200 charges the battery 10, the output current flows into the battery 10 through the switching module 21 and resistor R9. When the output current flows through resistor R9, a corresponding voltage drop is generated across resistor R9. If the output current is less than the current threshold, the voltage drop across resistor R9 is insufficient to control the switching transistor Q5 to turn on; if the output current is greater than the current threshold, the switching transistor Q5 will turn on based on the voltage drop across resistor R9. When the switching transistor Q5 turns on, the output current of the power supply 200 is input to the control terminal of the switching transistor Q4 through the switching transistor Q5 and diode D2, thereby controlling the switching transistor Q4 to turn on and simultaneously breaking down the Zener diode D1. When the switching transistor Q4 turns on, the switching module 21 turns off, thereby stopping the charging of the battery 10.

[0078] In yet another embodiment, such as Figure 2 As shown, the protection circuit 20 also includes a detection module 23; the detection module 23 is connected to the switch module 21, and the detection module 23 is also used to connect to the power supply 200;

[0079] The detection module 23 is used to detect the power supply voltage of the power supply 200, and outputs a second control signal to the switch module 21 when the power supply voltage is greater than a preset voltage, so as to turn on the switch module 21.

[0080] When the battery 10 needs charging, the detection module 23 detects the power supply voltage of the power supply 200. If the power supply voltage is greater than the preset voltage, it is considered that the power supply voltage of the power supply 200 meets the power supply conditions, and a second control signal is output to the switch module 21 to turn on the switch module 21, thereby starting to charge the battery 10. If the power supply voltage is less than the preset voltage, it is considered that the power supply 200 is in an undervoltage state. At this time, the detection module 23 will not output the second control signal, thereby turning off the switch module 21. Based on this, charging of the battery 10 can be stopped when an undervoltage condition is detected, thereby extending the service life of the energy storage power supply 100.

[0081] In some other embodiments, such as Figure 3 As shown, the detection module 23 includes a voltage regulator U1, a switching transistor Q2, resistors R2, R5, R6 and R7;

[0082] The reference input terminal of the voltage regulator U1 is connected to the power supply 200 through the resistor R6. The reference input terminal of the voltage regulator U1 is also grounded through the resistor R7. The cathode of the voltage regulator U1 is connected to the control terminal of the switching transistor Q2 through the resistor R5. The anode of the voltage regulator U1 is grounded. The first terminal of the switching transistor Q2 is connected to the power supply 200. The first terminal of the switching transistor Q2 is also connected to the resistor R5 through the resistor R2. The second terminal of the switching transistor Q2 is connected to the switching module 21.

[0083] Specifically, when the power supply 200 needs to charge the battery 10, the power supply voltage of the power supply 200 is applied to resistors R6 and R7, thereby dividing the power supply voltage of the power supply 200 and inputting the divided voltage to the reference input terminal of the voltage regulator U1. It should be noted that the operating state of the voltage regulator is determined based on the voltage input to the reference input terminal. The voltage regulator only starts working when the voltage input to the reference input terminal is greater than the voltage regulator's reference voltage. Therefore, when the power supply voltage is greater than the preset voltage, the divided power supply voltage will also be greater than the voltage regulator U1's reference voltage, causing the voltage regulator U1 to start working. After the voltage regulator U1 starts working, the voltage across resistor R5 is pulled low, thereby turning on the switching transistor Q2. When the switching transistor Q2 is turned on, the switching module 21 receives the second control signal and turns on according to the second control signal, thereby enabling the power supply 200 to charge the battery 10 through the switching module 21. When the power supply voltage is lower than the preset voltage, the voltage after voltage division will also be lower than the reference voltage of the voltage regulator U1, thereby causing the voltage regulator U1 to stop working. When the voltage regulator U1 stops working, the switching transistor Q2 is also turned off, thereby stopping the output of the second control signal, and thus causing the switching module 21 to turn off.

[0084] In some embodiments, such as Figure 3 As shown, the detection module 23 also includes a light-emitting diode (LED1), which is connected to the power supply 200 and the resistor R2. The LED1 is used to light up when the voltage regulator U1 starts working, thereby indicating that the power supply voltage of the power supply 200 meets the power supply requirements.

[0085] In another embodiment, such as Figure 3 As shown, the switching module 21 includes a switching transistor Q1, a switching transistor Q3, a resistor R3, a resistor R10, and a resistor R1;

[0086] The control terminal of the switch Q3 is connected to the power supply 200 through the resistor R10. The control terminal of the switch Q3 is also connected to the protection module 22 through the resistor R3. The first terminal of the switch Q3 is connected to the power supply 200 through the resistor R1. The second terminal of the switch Q3 is connected to the control terminal of the switch Q1. The first terminal of the switch Q1 is connected to the power supply 200. The second terminal of the switch Q1 is connected to the protection module 22 and the battery 10.

[0087] When the power supply 200 outputs current, a corresponding voltage drop occurs across resistor R10, causing switch Q3 to conduct. When switch Q3 conducts, switch Q1 also conducts, allowing the output current from the power supply 200 to be input to the battery 10 for charging. It should be noted that when switch Q3 is conducting, it is in an amplification state, providing a larger current to switch Q1, ensuring reliable conduction of switch Q1 and thus guaranteeing normal charging of battery 10.

[0088] This utility model embodiment provides a protection circuit, which includes a switch module and a protection module. The switch module is connected to the protection module and is also connected to a power supply and a battery, respectively. The protection module is also connected to the battery. The switch module receives the output current from the power supply and turns on based on the output current to output the output current to the battery, thereby charging the battery. During the battery charging process, the protection module monitors the battery temperature in real time to determine whether the battery is overheating. When the battery temperature exceeds a preset threshold, it is determined that the battery temperature is too high. At this time, the protection module outputs a first control signal to the switch module to turn off the switch module, thereby stopping the charging of the battery. This avoids safety accidents caused by overheating of the battery and improves the battery's lifespan.

[0089] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it; under the concept of this utility model, the technical features of the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations of different aspects of this utility model as described above, which are not provided in detail for the sake of brevity; although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A protection circuit, characterized in that, The protection circuit includes a switching module and a protection module; The switch module is connected to the protection module, and the switch module is also used to connect to the power supply and the battery respectively, and the protection module is also connected to the battery; The switching module is used to receive the output current of the power supply and turn on based on the output current to output the output current to the battery, thereby charging the battery; The protection module is used to detect the temperature of the battery in real time during the battery charging process, and output a first control signal to the switch module when the battery temperature is greater than a preset threshold, so as to turn off the switch module and stop charging the battery.

2. The protection circuit according to claim 1, characterized in that, The protection module includes a temperature detection unit and a protection unit; The temperature detection unit is connected to the switch module and the battery respectively, and the protection unit is connected to the temperature detection unit and the switch module respectively; The temperature detection unit is used to detect the temperature of the battery in real time during the battery charging process and receive the output current, so as to output a corresponding voltage signal to the protection unit based on the output current and the temperature of the battery; The protection unit is used to receive the voltage signal and start working based on the voltage signal when the temperature of the battery is greater than a preset threshold, thereby outputting a first control signal to the switch module to turn off the switch module.

3. The protection circuit according to claim 2, characterized in that, The temperature detection unit includes a thermistor and a voltage divider unit; The thermistor is connected to the battery, and the thermistor is also connected to the voltage divider unit. The voltage divider unit is connected to the switch module and the protection unit respectively. The voltage divider subunit is used to receive the output current of the power supply when the switching module is turned on, and convert the output current into a corresponding voltage signal and then divide the voltage signal to output the corresponding voltage signal to the protection unit. The thermistor responds to the temperature change of the battery and adjusts the voltage division ratio of the voltage signal in real time based on the battery temperature, so that the protection unit starts to work according to the voltage signal when the battery temperature is greater than a preset threshold.

4. The protection circuit according to claim 3, characterized in that, The protection unit includes a resistor R11, a switching transistor Q4, and a Zener diode D1; The control terminal of the switching transistor Q4 is connected to the temperature detection unit through the resistor R11. The first terminal of the switching transistor Q4 is connected to the switching module, and the second terminal of the switching transistor Q4 is connected to the cathode of the Zener diode D1. The anode of the Zener diode D1 is used for grounding.

5. The protection circuit according to claim 2, characterized in that, The protection module also includes an overcurrent detection unit; The overcurrent detection unit is connected to the protection unit, and the overcurrent detection unit is also used to connect to the power supply. The overcurrent detection unit is used to detect the output current of the power supply in real time when the switching module is turned on, and output a drive signal to the protection unit when the output current is greater than the current threshold, so that the protection unit can start working.

6. The protection circuit according to claim 5, characterized in that, The overcurrent detection unit includes a switch Q5, a diode D2, and a resistor R9; The control terminal of the switching transistor Q5 is connected to the switching module through the resistor R9. The first terminal of the switching transistor Q5 is connected to the switching module, the second terminal of the switching transistor Q5 is connected to the anode of the diode D2, and the cathode of the diode D2 is connected to the protection unit.

7. The protection circuit according to any one of claims 1-6, characterized in that, The protection circuit also includes a detection module; The detection module is connected to the switch module, and the detection module is also used to connect to the power supply. The detection module is used to detect the power supply voltage of the power supply, and outputs a second control signal to the switch module when the power supply voltage is greater than a preset voltage, so as to turn on the switch module.

8. The protection circuit according to claim 7, characterized in that, The detection module includes a voltage regulator U1, a switching transistor Q2, resistors R2, R5, R6, and R7; The reference input terminal of the voltage regulator U1 is connected to the power supply through the resistor R6. The reference input terminal of the voltage regulator U1 is also grounded through the resistor R7. The cathode of the voltage regulator U1 is connected to the control terminal of the switching transistor Q2 through the resistor R5. The anode of the voltage regulator U1 is grounded. The first terminal of the switching transistor Q2 is connected to the power supply. The first terminal of the switching transistor Q2 is also connected to the resistor R5 through the resistor R2. The second terminal of the switching transistor Q2 is connected to the switching module.

9. The protection circuit according to claim 7, characterized in that, The switching module includes a switching transistor Q1, a switching transistor Q3, a resistor R3, a resistor R10, and a resistor R1; The control terminal of the switch Q3 is connected to the power supply through the resistor R10. The control terminal of the switch Q3 is also connected to the protection module through the resistor R3. The first terminal of the switch Q3 is connected to the power supply through the resistor R1. The second terminal of the switch Q3 is connected to the control terminal of the switch Q1. The first terminal of the switch Q1 is connected to the power supply. The second terminal of the switch Q1 is connected to the protection module and the battery, respectively.

10. An energy storage power source, characterized in that, The energy storage power source includes: Batteries; and The protection circuit as described in any one of claims 1-9.

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