A circuit protection device for lithium battery energy storage

Abstract

This invention discloses a circuit protection device for lithium battery energy storage, including a power supply unit, a detection unit, a clock unit, a protection unit, and a lithium battery. The power supply unit and the protection unit are connected, the protection unit is connected to the lithium battery and the clock unit, and the detection unit is connected to the clock unit and the lithium battery. The power supply unit is used to provide a power supply signal to the lithium battery, the detection unit is used to detect the temperature of the lithium battery and feed back an over-temperature signal, and the clock unit is used to feed back the clock signal required by the protection unit. Based on the energy storage mode selected by the user and the clock signal feedback from the clock unit, the protection unit completes the voltage jump and the current adjustment after the jump while ensuring the safety of lithium battery energy storage.

Description

Technical Field

[0001] This invention relates to the field of lithium battery technology, and in particular to a circuit protection device for lithium battery energy storage. Background Technology

[0002] During initial energy storage, the power supply voltage and the lithium battery voltage increase as the stored energy increases. When the lithium battery's charging voltage exceeds its allowable peak charging voltage, the energy storage protection device will, based on factory settings, put it into a constant voltage energy storage state to prevent the lithium battery voltage from exceeding its allowable peak charging voltage. However, existing technologies cannot set buffer zones based on buffer start signals and buffer amounts during lithium battery energy storage, and cannot switch energy storage channels and jump the peak charging voltage of the lithium battery based on the buffer zones. This would prevent the power supply from continuously storing energy in the lithium battery during the constant voltage state, causing the lithium battery's charging voltage to exceed its allowable peak charging voltage. At the same time, it cannot, based on the user-selected energy storage mode, intermittently adjust the charging current after voltage jumps while ensuring safety. Summary of the Invention

[0003] To address the aforementioned technical problems, the present invention aims to provide a circuit protection device for lithium battery energy storage, comprising a power supply unit, a detection unit, a clock unit, a protection unit, and a lithium battery. The power supply unit and the protection unit are connected; the protection unit is connected to the lithium battery and the clock unit; and the detection unit is connected to the clock unit and the lithium battery. The power supply unit provides a power supply signal to the lithium battery. The detection unit detects the lithium battery temperature and feeds back an over-temperature signal. The clock unit feeds back the clock signal required by the protection unit. Based on the user-selected energy storage mode and the clock signal feedback from the clock unit, the protection unit performs voltage switching and current adjustment after the switching, ensuring the safety of lithium battery energy storage. The protection unit includes a third resistor R3 and a fourth resistor R4. The circuit consists of a sixth resistor R6, a second operational amplifier U2, a second MOSFET Q2, a first connector P1, a fourth connector P4, and a first diode D1. One end of the third resistor R3 is connected to the power supply, and the other end of the third resistor R3 is connected to one end of the fourth resistor R4 and the inverting input of the second operational amplifier U2. The output of the second operational amplifier U2 is connected to the gate of the second MOSFET Q2. The source of the second MOSFET Q2, the non-inverting input of the second operational amplifier U2, and the first connector P1 are connected. The drain of the second MOSFET Q2, one end of the sixth resistor R6, and the anode of the first diode D1 are connected. The cathode of the first diode D1 is connected to the fourth connector P4. The other ends of the fourth resistor R4 and the sixth resistor R6 are connected to the ground.

[0004] Furthermore, the protection unit also includes a second resistor R2, a seventh resistor R7, an eighth resistor R8, a ninth resistor R9, a tenth resistor R10, an eleventh resistor R11, a twelfth resistor R12, and a third operational amplifier U3. One end of the second resistor R2 and one end of the ninth resistor R9 are connected to the first connector P1. The other end of the ninth resistor R9 is connected to one end of the tenth resistor R10 and the non-inverting input of the third operational amplifier U3. The other end of the tenth resistor R10 is connected to one end of the eleventh resistor R11 and one end of the twelfth resistor R12. The other end of the eleventh resistor R11 is connected to the power supply. The output terminal of the third operational amplifier U3 is connected to one end of the seventh resistor R7. The inverting input of the third operational amplifier U3 is connected to the other end of the seventh resistor R7 and one end of the eighth resistor R8. The other ends of the second resistor R2, the eighth resistor R8, and the twelfth resistor R12 are connected to the ground terminal.

[0005] Furthermore, the protection unit also includes a first resistor R1, a fourteenth resistor R14, a twenty-third resistor R23, a first transistor Q1, a first operational amplifier U1, a fourth digital potentiometer U4, a sixth operational amplifier U6, a first transistor Q1, and a third MOSFET Q3. The collector of the first transistor Q1 and the first pin of the fourth digital potentiometer U4 are connected to the power supply. The base of the first transistor Q1 is connected to one end of the first resistor R1, and the other end of the first resistor R1 is connected to the output terminal of the first operational amplifier U1. The non-inverting input of the first operational amplifier U1 is connected to the output terminal of the third operational amplifier U3. The inverting input of the first operational amplifier U1 is connected to the emitter of the first transistor Q1 and the third pin of the fourth digital potentiometer U4. The fifth pin of the fourth digital potentiometer U4 is connected to the first transistor Q1 and the drain of the third MOSFET Q3. The gate of the third MOSFET Q3 and the gate of the second MOSFET Q2 are connected. The source of the third MOSFET Q3 and the drain of the second MOSFET Q2 are connected. The seventh pin of the fourth digital potentiometer U4 is connected to one end of the fourteenth resistor R14 and the output of the sixth operational amplifier U6. The non-inverting input of the sixth operational amplifier U6 and one end of the twenty-third resistor R23 are connected. The inverting input of the sixth operational amplifier U6 and the inverting input of the second operational amplifier U2 are connected. The other end of the fourteenth resistor R14, the other end of the twenty-third resistor R23, the other end of the first transistor Q1, and the ground terminal are connected.

[0006] Furthermore, the protection unit also includes a thirteenth resistor R13, a fifteenth resistor R15, a twentieth resistor R20, a fifth operational amplifier U5, a seventh operational amplifier U7, a fourth MOSFET Q4, a fifth MOSFET Q5, a second connector P2, a third connector P3, and a third diode D3. One end of the twentieth resistor R20 is connected to the power supply, and the other end of the twentieth resistor R20 is connected to one end of the fifteenth resistor R15 and the inverting input of the fifth operational amplifier U5. The non-inverting input of the fifth operational amplifier U5 is connected to the drain of the fourth MOSFET Q4 and the seventh operational amplifier U7. 7. Connect the output terminal. Connect the non-inverting terminal of the seventh operational amplifier U7 to the second connector P2. Connect the output terminal of the fifth operational amplifier U5 to the anode of the third diode D3, the second pin of the fourth digital potentiometer U4, and one end of the thirteenth resistor R13. Connect the cathode of the third diode D3 to the drain of the fifth MOSFET Q5 and the non-inverting terminal of the sixth operational amplifier U6. Connect the gate of the fifth MOSFET Q5 to the third connector P3. Connect the source of the fourth MOSFET Q4, the source of the fifth MOSFET Q5, the other end of the thirteenth resistor R13, the other end of the fifteenth resistor R15, and the ground terminal.

[0007] Furthermore, the protection unit also includes a sixteenth resistor R16, a seventeenth resistor R17, an eighteenth resistor R18, a nineteenth resistor R19, and a second diode D2. One end of the sixteenth resistor R16 and one end of the eighteenth resistor R18 are connected to the power supply. The other end of the sixteenth resistor R16, one end of the seventeenth resistor R17, and the inverting input of the seventh operational amplifier U7 are connected. The other end of the eighteenth resistor R18, one end of the nineteenth resistor R19, the cathode of the second diode D2, and the second connector P2 are connected. The anode of the second diode D2 is connected to the drain of the fourth MOSFET Q4. The other ends of the seventeenth resistor R17 and the nineteenth resistor R19 are connected to the ground terminal.

[0008] Furthermore, the protection unit also includes a 25th resistor R25, a 26th resistor R26, a 6th MOSFET Q6, and a 2nd LED. One end of the 25th resistor R25 is connected to the power supply, and the other end of the 25th resistor R25, one end of the 26th resistor R26, and the source of the 6th MOSFET Q6 are connected. The gate of the 6th MOSFET Q6 is connected to the non-inverting input of the 5th operational amplifier U5. The drain of the 6th MOSFET Q6 is connected to the anode of the 2nd LED. The cathode of the 2nd LED, the other end of the 26th resistor R26, and the ground terminal are connected.

[0009] Furthermore, the protection unit also includes a first light-emitting diode LED1 and a twenty-fourth resistor R24. One end of the twenty-fourth resistor R24 ​​is connected to the gate of the sixth MOSFET Q6, and the other end of the twenty-fourth resistor R24 ​​is connected to the anode of the first light-emitting diode LED1. The cathode of the first light-emitting diode LED1 is connected to the ground terminal.

[0010] Furthermore, the protection unit also includes a fifth resistor R5, one end of which is connected to the gate of the second MOS transistor Q2, and the other end of which is connected to the ground terminal.

[0011] Furthermore, the protection unit also includes a 21st resistor R21 and a 22nd resistor R22. One end of the 21st resistor R21 is connected to the gate of the fourth MOSFET Q4 and the fifth connector P5. One end of the 22nd resistor R22 is connected to the gate of the fifth MOSFET Q5. The other ends of the 21st resistor R21 and the 22nd resistor R22 are connected to the ground terminal.

[0012] Furthermore, the protection unit also includes a twenty-seventh resistor R27, one end of which is connected to the gate of the sixth MOSFET Q6, and the other end of which is connected to the ground terminal.

[0013] The advantages of this invention compared to the prior art are:

[0014] This invention can set buffer zones based on buffer start signals and buffer amounts during lithium battery energy storage, and complete the switching of energy storage channels and the jump of peak charging voltage of lithium batteries based on the buffer zones. It can also intermittently adjust the charging current after voltage jump based on the user-selected energy storage mode while ensuring its safety. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the prior art and embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0017] Figure 2 This is a schematic diagram of the protection unit structure provided by the present invention. Detailed Implementation

[0018] To make the objectives and advantages of the present invention clearer, the present invention will be specifically described below in conjunction with embodiments. It should be understood that the following text is only used to describe one or more specific embodiments of the present invention and does not strictly limit the scope of protection specifically claimed by the present invention.

[0019] This invention discloses a circuit protection device for lithium battery energy storage, comprising a power supply unit, a detection unit, a clock unit, a protection unit, and a lithium battery. The power supply unit and the protection unit are connected; the protection unit is connected to the lithium battery and the clock unit; and the detection unit is connected to the clock unit and the lithium battery. The power supply unit provides a power supply signal to the lithium battery. The detection unit detects the lithium battery temperature and provides an over-temperature signal. The clock unit provides a clock signal required by the protection unit. Based on the user-selected energy storage mode and the clock signal feedback from the clock unit, the protection unit performs voltage jumps and current adjustments after the jumps while ensuring the safety of lithium battery energy storage. The protection unit includes a third resistor R3, a fourth resistor R4, and a sixth resistor R... 6. The second operational amplifier U2, the second MOSFET Q2, the first connector P1, the fourth connector P4, and the first diode D1 are connected. One end of the third resistor R3 is connected to the power supply. The other end of the third resistor R3 is connected to one end of the fourth resistor R4 and the inverting input of the second operational amplifier U2. The output of the second operational amplifier U2 is connected to the gate of the second MOSFET Q2. The source of the second MOSFET Q2, the non-inverting input of the second operational amplifier U2, and the first connector P1 are connected. The drain of the second MOSFET Q2 is connected to one end of the sixth resistor R6 and the anode of the first diode D1. The cathode of the first diode D1 is connected to the fourth connector P4. The other ends of the fourth resistor R4 and the sixth resistor R6 are connected to the ground.

[0020] Specifically, the protection unit also includes a second resistor R2, a seventh resistor R7, an eighth resistor R8, a ninth resistor R9, a tenth resistor R10, an eleventh resistor R11, a twelfth resistor R12, and a third operational amplifier U3. One end of the second resistor R2 and one end of the ninth resistor R9 are connected to the first connector P1. The other end of the ninth resistor R9 is connected to one end of the tenth resistor R10 and the non-inverting input of the third operational amplifier U3. The other end of the tenth resistor R10 is connected to one end of the eleventh resistor R11 and one end of the twelfth resistor R12. The other end of the eleventh resistor R11 is connected to the power supply. The output terminal of the third operational amplifier U3 is connected to one end of the seventh resistor R7. The inverting input of the third operational amplifier U3 is connected to the other end of the seventh resistor R7 and one end of the eighth resistor R8. The other ends of the second resistor R2, the eighth resistor R8, and the twelfth resistor R12 are connected to the ground terminal.

[0021] Specifically, the protection unit also includes a first resistor R1, a fourteenth resistor R14, a twenty-third resistor R23, a first transistor Q1, a first operational amplifier U1, a fourth digital potentiometer U4, a sixth operational amplifier U6, a first transistor Q1, and a third MOSFET Q3. The collector of the first transistor Q1 and the first pin of the fourth digital potentiometer U4 are connected to the power supply. The base of the first transistor Q1 is connected to one end of the first resistor R1, and the other end of the first resistor R1 is connected to the output terminal of the first operational amplifier U1. The non-inverting input of the first operational amplifier U1 is connected to the output terminal of the third operational amplifier U3. The inverting input of the first operational amplifier U1 is connected to the emitter of the first transistor Q1, the third pin of the fourth digital potentiometer U4, and the fourth MOSFET Q3. The fifth pin of the fourth digital potentiometer U4 is connected to the first transistor Q1 and the drain of the third MOSFET Q3. The gate of the third MOSFET Q3 and the gate of the second MOSFET Q2 are connected. The source of the third MOSFET Q3 and the drain of the second MOSFET Q2 are connected. The seventh pin of the fourth digital potentiometer U4 is connected to one end of the fourteenth resistor R14 and the output of the sixth operational amplifier U6. The non-inverting input of the sixth operational amplifier U6 and one end of the twenty-third resistor R23 are connected. The inverting input of the sixth operational amplifier U6 and the inverting input of the second operational amplifier U2 are connected. The other end of the fourteenth resistor R14, the other end of the twenty-third resistor R23, the other end of the first transistor Q1, and the ground terminal are connected.

[0022] Specifically, the protection unit also includes a thirteenth resistor R13, a fifteenth resistor R15, a twentieth resistor R20, a fifth operational amplifier U5, a seventh operational amplifier U7, a fourth MOSFET Q4, a fifth MOSFET Q5, a second connector P2, a third connector P3, and a third diode D3. One end of the twentieth resistor R20 is connected to the power supply, and the other end of the twentieth resistor R20 is connected to one end of the fifteenth resistor R15 and the inverting input of the fifth operational amplifier U5. The non-inverting input of the fifth operational amplifier U5 is connected to the drain of the fourth MOSFET Q4 and the seventh operational amplifier U7. 7. Connect the output terminal. Connect the non-inverting terminal of the seventh operational amplifier U7 to the second connector P2. Connect the output terminal of the fifth operational amplifier U5 to the anode of the third diode D3, the second pin of the fourth digital potentiometer U4, and one end of the thirteenth resistor R13. Connect the cathode of the third diode D3 to the drain of the fifth MOSFET Q5 and the non-inverting terminal of the sixth operational amplifier U6. Connect the gate of the fifth MOSFET Q5 to the third connector P3. Connect the source of the fourth MOSFET Q4, the source of the fifth MOSFET Q5, the other end of the thirteenth resistor R13, the other end of the fifteenth resistor R15, and the ground terminal.

[0023] Specifically, the protection unit also includes a sixteenth resistor R16, a seventeenth resistor R17, an eighteenth resistor R18, a nineteenth resistor R19, and a second diode D2. One end of the sixteenth resistor R16 and one end of the eighteenth resistor R18 are connected to the power supply. The other end of the sixteenth resistor R16, one end of the seventeenth resistor R17, and the inverting input of the seventh operational amplifier U7 are connected. The other end of the eighteenth resistor R18, one end of the nineteenth resistor R19, the cathode of the second diode D2, and the second connector P2 are connected. The anode of the second diode D2 is connected to the drain of the fourth MOSFET Q4. The other ends of the seventeenth resistor R17 and the nineteenth resistor R19 are connected to the ground terminal.

[0024] Specifically, the protection unit also includes a 25th resistor R25, a 26th resistor R26, a 6th MOSFET Q6, and a 2nd LED. One end of the 25th resistor R25 is connected to the power supply, and the other end of the 25th resistor R25, one end of the 26th resistor R26, and the source of the 6th MOSFET Q6 are connected. The gate of the 6th MOSFET Q6 is connected to the non-inverting input of the 5th operational amplifier U5. The drain of the 6th MOSFET Q6 is connected to the anode of the 2nd LED. The cathode of the 2nd LED, the other end of the 26th resistor R26, and the ground terminal are connected.

[0025] Specifically, the protection unit also includes a first light-emitting diode LED1 and a twenty-fourth resistor R24. One end of the twenty-fourth resistor R24 ​​is connected to the gate of the sixth MOSFET Q6, and the other end of the twenty-fourth resistor R24 ​​is connected to the anode of the first light-emitting diode LED1. The cathode of the first light-emitting diode LED1 is connected to the ground terminal.

[0026] Specifically, the protection unit also includes a fifth resistor R5, one end of which is connected to the gate of the second MOS transistor Q2, and the other end of which is connected to the ground terminal.

[0027] Specifically, the protection unit also includes a 21st resistor R21 and a 22nd resistor R22. One end of the 21st resistor R21 is connected to the gate of the fourth MOSFET Q4 and the fifth connector P5. One end of the 22nd resistor R22 is connected to the gate of the fifth MOSFET Q5. The other ends of the 21st resistor R21 and the 22nd resistor R22 are connected to the ground terminal.

[0028] Specifically, the protection unit also includes a 27th resistor R27, one end of which is connected to the gate of the 6th MOS transistor Q6, and the other end of which is connected to the ground terminal.

[0029] See appendix Figure 1 Appendix Figure 2In this embodiment, the power supply unit feeds back a power signal to the first connector P1 on the protection unit. This signal passes through the source and drain of the second MOSFET Q2, and the sixth resistor R6 to the ground circuit. The signal at the sixth resistor R6 is fed back to the lithium battery power input terminal through the first diode D1 and the fourth connector P4, and the lithium battery enters the charging state. The voltage at the first connector P1 gradually rises. The power signal passes through the third resistor R3 and the fourth resistor R4 to the ground circuit. The signal at the fourth resistor R4 is a buffer start signal that is lower than the peak voltage allowed for battery charging. When charging begins, after the voltage at the first connector P1 rises to the reference signal, the second operational amplifier U2 outputs and feeds back to the gate of the second MOSFET Q2. The fifth resistor R5 discharges the parasitic capacitance of the gate of the second MOSFET Q2. The voltage difference between the gate of the second MOSFET Q2 and the source of the second MOSFET Q2 is higher than the conduction threshold, and the second MOSFET Q2 is turned off. There is no signal feedback at the fourth connector P4. Thus, during the lithium battery energy storage process, when the signal amplitude at the first connector P1 is higher than the reference signal, the energy storage channel of the lithium battery is cut off to provide an energy storage buffer for subsequent energy storage.

[0030] See appendix Figure 2 In this embodiment, the signal at the first connector P1 terminal goes to the grounding circuit via the second resistor R2. The signal at the second resistor R2 terminal is fed back to the non-inverting input of the third operational amplifier U3 via the ninth resistor R9. The power signal goes to the grounding circuit via the eleventh resistor R11 and the twelfth resistor R12. The signal at the twelfth resistor R12 terminal serves as a buffer between the initial signal and the peak voltage. The signal at the eleventh resistor R11 terminal is fed back to the non-inverting input of the third operational amplifier U3 via the tenth resistor R10. The output signal of the third operational amplifier U3 goes to the grounding circuit via the seventh resistor R7 and the eighth resistor R8. At the same time, the signal at the eighth resistor R8 terminal is fed back to the inverting input of the third operational amplifier U3, making the output signal of the third operational amplifier U3 the peak voltage that allows the lithium battery to charge. This provides the peak voltage that allows charging to the next stage circuit during the energy storage channel switching.

[0031] See appendix Figure 2In this embodiment, when the second operational amplifier U2 outputs, the output signal of the second operational amplifier U2 is synchronously fed back to the gate of the third MOSFET Q3. The voltage difference between the gate and source of the third MOSFET Q3 is higher than the conduction threshold, so the third MOSFET Q3 is turned on. The output signal of the third operational amplifier U3 is fed back to the non-inverting input of the first operational amplifier U1, and the first operational amplifier U1 outputs. The output signal of the first operational amplifier U1 is fed back after passing through the first resistor R1, the base of the first transistor Q1, and the emitter of the first transistor Q1. The power supply signal is transmitted to pins 3 and 5 of the fourth digital potentiometer U4. Simultaneously, the first transistor Q1 is turned on. The power signal passes through the collector and emitter of the first transistor Q1 and is fed back to the inverting input of the first operational amplifier U1, ensuring that the emitter voltage signal of the first transistor Q1 always follows the output voltage signal of the third operational amplifier U3. When the third MOSFET Q3 is turned on, the signal at pin 6 of the fourth digital potentiometer U4 passes through the first transistor Q1 to the ground circuit. The signal from the first transistor Q1 passes through the drain of the third MOSFET Q3 and... The source, first diode D1, and fourth connector P4 feed back to the power input terminal of the lithium battery, ensuring that the charging voltage of the lithium battery is the peak voltage that the lithium battery is allowed to charge. The signal at the fourth resistor R4 is synchronously fed back to the inverting input of the sixth operational amplifier U6. The twenty-third resistor R23 is a pull-down resistor at the non-inverting input of the sixth operational amplifier U6, keeping the sixth operational amplifier U6 in the off state. At the same time, the output signal of the sixth operational amplifier U6 is routed to the ground terminal via the fourteenth resistor R14. The signal at the fourteenth resistor R14 is fed back to pin 7 of the fourth digital potentiometer U4. At this time, pin 2 of the fourth digital potentiometer U4 is at a low level. The fourth digital potentiometer U4 adjusts its own resistance to keep the signal at the first transistor Q1 in a low current state. This ensures that after the energy storage channel switching is completed, the lithium battery charging voltage jumps from any amplitude in the buffer zone to the peak voltage that is allowed to charge. This prevents the power supply from continuously causing the lithium battery's charging voltage to be higher than its peak voltage during the period when the lithium battery enters a constant voltage state, and ensures that the lithium battery is charged at the normal charging current after jumping to the peak charging voltage.

[0032] See appendix Figure 1 , attached Figure 2In this embodiment, the energy storage mode signal is fed back by the user. The lithium battery is initially in the normal energy storage mode. When the user feeds back the fast energy storage mode signal, the signal is fed back to the non-inverting input of the seventh operational amplifier U7 on the protection unit via the second connector P2. The seventh operational amplifier U7 outputs, and the signal from the output of the seventh operational amplifier U7 is fed back to the output of the fifth operational amplifier U5. The power signal passes through the twentieth resistor R20 and the fifteenth resistor R15 to the grounding circuit. The signal from the fifteenth resistor R15 is fed back to the inverting input of the fifth operational amplifier U5. The output signal of the fifth operational amplifier U5 goes through the thirteenth resistor R13 to the ground circuit. The signal at the thirteenth resistor R13 is fed back to pin 2 of the fourth digital potentiometer U4, making pin 2 of the fourth digital potentiometer U4 high. Simultaneously, the output signal of the second operational amplifier U2 goes through the third diode D3 and the twenty-third resistor R23 to the ground circuit. The sixth operational amplifier U6 is in output mode, the fourth digital potentiometer U4 stops adjusting, and the signal at the second connector P2 is synchronously fed back to the clock unit. The clock unit intermittently feeds back the clock signal to... The third connector P3 on the protection unit is at a high level when it receives a constant signal feedback. This signal is fed back to the gate of the fifth MOSFET Q5. The twenty-second resistor R22 is used to discharge the capacitance generated by the gate of the fifth MOSFET Q5. When the voltage difference between the gate and source of the fifth MOSFET Q5 exceeds the conduction threshold, the fifth MOSFET Q5 conducts. The signal from the output of the sixth operational amplifier U6 loops through the drain and source of the fifth MOSFET Q5 to ground, turning off the sixth operational amplifier U6. The fourth digital potentiometer U4 adjusts its own resistance value. The first transistor Q1 emits an extreme current that increases. When the third connector P3 loses its constant signal feedback, the sixth operational amplifier U6 outputs, the fourth digital potentiometer U4 stops adjusting, the detection unit detects the lithium battery temperature, and sets a safe temperature through the detection unit. When the lithium battery temperature is higher than the safe temperature, the detection unit feeds back an over-temperature signal to the clock unit, and the clock unit stops feeding back the clock signal. In this way, when the user selects the fast energy storage mode, the charging voltage is kept at the peak voltage that the lithium battery can be charged, and the charging current is gradually increased and the current adjustment is stopped when the lithium battery temperature is higher than the safe temperature.

[0033] See appendix Figure 2In this embodiment, the power signal passes through the eighteenth resistor R18 and the nineteenth resistor R19 to the ground circuit. The signal at the nineteenth resistor R19 is fed back to the non-inverting input of the seventh operational amplifier U7. The power signal also passes through the sixteenth resistor R16 and the seventeenth resistor R17 to the ground circuit. The signal at the seventeenth resistor R17 is fed back to the inverting input of the seventh operational amplifier U7. When the user provides a fast energy storage mode signal, the signal at the nineteenth resistor R19 rises, and the seventh operational amplifier U7 outputs. The output signal of the seventh operational amplifier U7 passes through the second diode D2 and the nineteenth resistor R19 to the ground circuit, causing the seventh operational amplifier U7 to output normally. When a user provides feedback on a normal energy storage mode signal, the signal is fed back to the gate of the fourth MOSFET Q4 on the protection unit via the fifth connector P5. The twenty-first resistor R21 is used to discharge the parasitic capacitance of the gate of the fourth MOSFET Q4. When the voltage difference between the gate and source of the fourth MOSFET Q4 is higher than the conduction threshold, the fourth MOSFET Q4 is turned on. The signal output from the seventh operational amplifier U7 is looped through the drain and source of the fourth MOSFET Q4 to the ground terminal. The seventh operational amplifier U7 is normally turned off. In this way, the protection unit can remember the feedback signal after the user provides feedback on a fast / normal energy storage mode signal.

[0034] See appendix Figure 2 In this embodiment, when the lithium battery is in the normal energy storage mode, the power signal passes through the 25th resistor R25 and the 26th resistor R26 to the ground circuit. The signal at the 26th resistor R26 passes through the source of the 6th MOSFET Q6, the drain of the 6th MOSFET Q6, and the second light-emitting diode LED2 to the ground circuit. The second light-emitting diode LED2 is turned on, and the continuity indicator of the second light-emitting diode LED2 is the indication signal of the normal energy storage mode. When the lithium battery is in the fast energy storage mode, the output signal of the 7th operational amplifier U7 is synchronously fed back to the gate of the 6th MOSFET Q6. The 27th resistor R27 is used to discharge the parasitic capacitance of the gate of the 6th MOSFET Q6. The voltage difference between the gate and the source of the 6th MOSFET Q6 is higher than the conduction threshold, and the 6th MOSFET Q6 is turned off. At the same time, the output signal of the 7th operational amplifier U7 passes through the 24th resistor R24 ​​and the first light-emitting diode LED1 to the ground circuit. The first light-emitting diode LED1 is turned on, and the continuity indicator of the first light-emitting diode LED1 is the indication signal of the fast energy storage mode.

[0035] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No markings in the claims should be construed as limiting the scope of the claims.

Claims

1. A circuit protection device for lithium battery energy storage, comprising a power supply unit, a detection unit, a clock unit, a protection unit, and a lithium battery, wherein the power supply unit and the protection unit are connected, the protection unit is connected to the lithium battery and the clock unit, and the detection unit is connected to the clock unit and the lithium battery, characterized in that, The power supply unit provides the lithium battery power supply signal, the detection unit detects the lithium battery temperature and feeds back an over-temperature signal, and the clock unit provides the clock signal required by the protection unit. Based on the user-selected energy storage mode and the clock signal feedback from the clock unit, the protection unit performs energy storage voltage switching and current adjustment after the switching while ensuring the safety of lithium battery energy storage. The protection unit includes a third resistor, a fourth resistor, a sixth resistor, a second operational amplifier, a second MOSFET, a first connector, a fourth connector, a first diode, a first resistor, a fourteenth resistor, a twenty-third resistor, a first transistor, a first operational amplifier, a fourth digital potentiometer, a sixth operational amplifier, a first transistor, and a third MOSFET. One end of the third resistor is connected to the power supply, and the other end is connected to one end of the fourth resistor and the inverting input of the second operational amplifier. The output of the second operational amplifier is connected to the gate of the second MOSFET. The source of the second MOSFET, the non-inverting input of the second operational amplifier, and the first connector are connected. The drain of the second MOSFET is connected to one end of the sixth resistor and the anode of the first diode. The cathode of the first diode is connected to the fourth connector. The other end of the fourth resistor... The other end of the sixth resistor is connected to the ground terminal. The collector of the first transistor, the first pin of the fourth digital potentiometer, and the power supply are connected. The base of the first transistor is connected to one end of the first resistor. The other end of the first resistor is connected to the output of the first operational amplifier. The non-inverting input of the first operational amplifier is connected to the output of the third operational amplifier. The inverting input of the first operational amplifier is connected to the emitter of the first transistor, the third pin of the fourth digital potentiometer, and the fifth pin of the fourth digital potentiometer. The sixth pin of the fourth digital potentiometer is connected to one end of the first transistor and the drain of the third MOSFET. The gate of the third MOSFET and the gate of the second MOSFET are connected. The source of the third MOSFET and the drain of the second MOSFET are connected. The seventh pin of the fourth digital potentiometer is connected to one end of the fourteenth resistor and the output of the sixth operational amplifier. The non-inverting input of the sixth operational amplifier and one end of the twenty-third resistor are connected. The inverting input of the sixth operational amplifier and the inverting input of the second operational amplifier are connected. The other ends of the fourteenth resistor, the twenty-third resistor, and the first transistor are connected to the ground terminal. The power supply unit feeds back the power signal to the first connector P1 on the protection unit, and the fourth connector P4 feeds back the signal to the lithium battery power input terminal.

2. The circuit protection device for lithium battery energy storage according to claim 1, characterized in that, The protection unit further includes a second resistor, a seventh resistor, an eighth resistor, a ninth resistor, a tenth resistor, an eleventh resistor, a twelfth resistor, and a third operational amplifier. One end of the second resistor and one end of the ninth resistor are connected to the first connector. The other end of the ninth resistor is connected to one end of the tenth resistor and the non-inverting input of the third operational amplifier. The other end of the tenth resistor is connected to one end of the eleventh resistor and one end of the twelfth resistor. The other end of the eleventh resistor is connected to the power supply. The output terminal of the third operational amplifier is connected to one end of the seventh resistor. The inverting input of the third operational amplifier is connected to the other end of the seventh resistor and one end of the eighth resistor. The other ends of the second resistor, the eighth resistor, and the twelfth resistor are connected to the ground terminal.

3. The circuit protection device for lithium battery energy storage according to claim 1, characterized in that, The protection unit further includes a thirteenth resistor, a fifteenth resistor, a twentieth resistor, a fifth operational amplifier, a seventh operational amplifier, a fourth MOSFET, a fifth MOSFET, a second connector, a third connector, and a third diode. One end of the twentieth resistor is connected to the power supply, and the other end of the twentieth resistor is connected to one end of the fifteenth resistor and the inverting input of the fifth operational amplifier. The non-inverting input of the fifth operational amplifier is connected to the drain of the fourth MOSFET and the output of the seventh operational amplifier. The non-inverting input of the seventh operational amplifier is connected to the second connector. The output of the fifth operational amplifier is connected to the anode of the third diode, the second pin of the fourth digital potentiometer, and one end of the thirteenth resistor. The cathode of the third diode is connected to the drain of the fifth MOSFET and the non-inverting input of the sixth operational amplifier. The gate of the fifth MOSFET is connected to the third connector. The source of the fourth MOSFET, the source of the fifth MOSFET, the other end of the thirteenth resistor, and the other end of the fifteenth resistor are connected to the ground terminal.

4. The circuit protection device for lithium battery energy storage according to claim 3, characterized in that, The protection unit also includes a sixteenth resistor, a seventeenth resistor, an eighteenth resistor, a nineteenth resistor, and a second diode. One end of the sixteenth resistor and one end of the eighteenth resistor are connected to the power supply. The other end of the sixteenth resistor, one end of the seventeenth resistor, and the inverting input of the seventh operational amplifier are connected. The other end of the eighteenth resistor, one end of the nineteenth resistor, the cathode of the second diode, and the second connector are connected. The anode of the second diode is connected to the drain of the fourth MOS transistor. The other ends of the seventeenth resistor and the nineteenth resistor are connected to the ground terminal.

5. The circuit protection device for lithium battery energy storage according to claim 3, characterized in that, The protection unit also includes a 25th resistor, a 26th resistor, a 6th MOSFET, and a 2nd LED. One end of the 25th resistor is connected to the power supply. The other end of the 25th resistor and one end of the 26th resistor are connected to the source of the 6th MOSFET. The gate of the 6th MOSFET is connected to the non-inverting input of the 5th operational amplifier. The drain of the 6th MOSFET is connected to the anode of the 2nd LED. The cathode of the 2nd LED and the other end of the 26th resistor are connected to the ground terminal.

6. The circuit protection device for lithium battery energy storage according to claim 5, characterized in that, The protection unit also includes a first light-emitting diode and a twenty-fourth resistor. One end of the twenty-fourth resistor is connected to the gate of the sixth MOS transistor, and the other end of the twenty-fourth resistor is connected to the anode of the first light-emitting diode. The cathode of the first light-emitting diode is connected to the ground terminal.

7. The circuit protection device for lithium battery energy storage according to claim 1, characterized in that, The protection unit also includes a fifth resistor, one end of which is connected to the gate of the second MOS transistor, and the other end of which is connected to the ground terminal.

8. The circuit protection device for lithium battery energy storage according to claim 3, characterized in that, The protection unit further includes a 21st resistor and a 22nd resistor. One end of the 21st resistor is connected to the gate of the fourth MOS transistor and the fifth connector. One end of the 22nd resistor is connected to the gate of the fifth MOS transistor. The other ends of the 21st resistor and the 22nd resistor are connected to the ground terminal.

9. The circuit protection device for lithium battery energy storage according to claim 5, characterized in that, The protection unit also includes a 27th resistor, one end of which is connected to the gate of the 6th MOS transistor, and the other end of which is connected to the ground terminal.

Images