Circuit protection device for lithium battery energy storage

Abstract

The invention discloses a circuit protection device for lithium battery energy storage, which comprises a power supply unit, a detection unit, a clock unit, a protection unit and a lithium battery, and is characterized in that the power supply unit is connected with the protection unit, the protection unit is connected with the lithium battery and the clock unit, the detection unit is connected with the clock unit and the lithium battery, and the power supply unit is used for providing a lithium battery power supply signal; the detection unit is used for detecting the temperature of the lithium battery and feeding back an over-temperature signal, the clock unit is used for feeding back a clock signal required by the protection unit, and the protection unit completes hopping of energy storage voltage and current adjustment after hopping on the premise of ensuring the energy storage safety of the lithium battery based on an energy storage mode selected by a user and the clock signal feedback of the clock unit.

Description

Technical Field

[0001] The present invention relates to the technical field of lithium batteries, and in particular to a circuit protection device for lithium battery energy storage. Background Art

[0002] When the lithium battery is initially storing energy, the voltage at the power supply end and the voltage of the lithium battery will increase as the storage energy of the lithium battery increases. When the charging voltage of the lithium battery is higher than its allowable peak charging voltage, the energy storage protection device will, based on the factory settings, cause it to enter a constant voltage energy storage state to prevent the lithium battery voltage from being higher than its allowable charging peak voltage. However, existing technical means are unable to set a buffer interval based on a buffer start signal and a buffer amount during the lithium battery energy storage period, and to complete the switching of energy storage channels and the jump of the lithium battery peak charging voltage based on the buffer interval, thereby preventing the power supply end from continuously causing the lithium battery to store energy during the period when the lithium battery enters a constant voltage state so that the charging voltage of the lithium battery is higher than its allowable charging peak voltage. At the same time, it is unable to intermittently adjust the charging current after the voltage jump while ensuring its safety based on the energy storage mode selected by the user. Summary of the invention

[0003] In view of the above technical problems, the purpose of the present invention is to provide 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 is connected to the protection unit, 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 lithium battery power supply signal, the detection unit is used to detect the temperature of the lithium battery and feedback an over-temperature signal, the clock unit is used to feedback the clock signal required by the protection unit, and the protection unit completes the jump of the energy storage voltage and the current adjustment after the jump under the premise of ensuring the safety of lithium battery energy storage based on the energy storage mode selected by the user and the clock signal feedback of the clock unit. The protection unit includes a third resistor R3 and a fourth resistor R4 , a sixth resistor R6, a second operational amplifier U2, a second MOS transistor 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, the other end of the third resistor R3 is connected to one end of the fourth resistor R4 and the inverting end of the second operational amplifier U2, the output end of the second operational amplifier U2 is connected to the gate of the second MOS transistor Q2, the source of the second MOS transistor Q2, the in-phase end of the second operational amplifier U2 are connected to the first connector P1, the drain of the second MOS transistor 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, and the other end of the fourth resistor R4 and the other end of 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 in-phase end 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 end of the third operational amplifier U3 is connected to one end of the seventh resistor R7, the inverting end 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 end of the second resistor R2, the other end of the eighth resistor R8, the other end of the twelfth resistor R12 is connected to the ground end.

[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 MOS tube Q3, wherein 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, the other end of the first resistor R1 is connected to the output end of the first operational amplifier U1, the in-phase end of the first operational amplifier U1 is connected to the output end of the third operational amplifier U3, the inverting end 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 third MOS tube Q3. The fifth pin of the fourth digital potentiometer U4 is connected, the sixth pin of the fourth digital potentiometer U4 is connected to one end of the first transistor Q1 and the drain of the third MOS tube Q3, the gate of the third MOS tube Q3 is connected to the gate of the second MOS tube Q2, the source of the third MOS tube Q3 is connected to the drain of the second MOS tube Q2, the seventh pin of the fourth digital potentiometer U4 is connected to one end of the fourteenth resistor R14 and the output end of the sixth operational amplifier U6, the in-phase end of the sixth operational amplifier U6 is connected to one end of the twenty-third resistor R23, the inverting end of the sixth operational amplifier U6 is connected to the inverting end of the second operational amplifier U2, 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 are connected.

[0006] Furthermore, the protection unit further 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 MOS tube Q4, a fifth MOS tube 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, the other end of the twentieth resistor R20 is connected to one end of the fifteenth resistor R15 and the inverting end of the fifth operational amplifier U5, the in-phase end of the fifth operational amplifier U5 is connected to the drain of the fourth MOS tube Q4, and the seventh operational amplifier U The output end of the seventh operational amplifier U7 is connected to the second connector P2, the output end of the fifth operational amplifier U5 is connected 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, the cathode of the third diode D3 is connected to the drain of the fifth MOS tube Q5 and the non-inverting end of the sixth operational amplifier U6, the gate of the fifth MOS tube Q5 is connected to the third connector P3, the source of the fourth MOS tube Q4, the source of the fifth MOS tube Q5, the other end of the thirteenth resistor R13, the other end of the fifteenth resistor R15 and the grounding end are connected.

[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 is connected to one end of the seventeenth resistor R17 and the inverting end of the seventh operational amplifier U7, the other end of the eighteenth resistor R18, one end of the nineteenth resistor R19, the cathode of the second diode D2 are connected to the second connector P2, the anode of the second diode D2 is connected to the drain of the fourth MOS tube Q4, and the other end of the seventeenth resistor R17 and the other end of the nineteenth resistor R19 are connected to the ground.

[0008] Furthermore, the protection unit also includes a twenty-fifth resistor R25, a twenty-sixth resistor R26, a sixth MOS tube Q6, and a second light-emitting diode LED2, one end of the twenty-fifth resistor R25 is connected to the power supply, the other end of the twenty-fifth resistor R25 is connected to one end of the twenty-sixth resistor R26 and the source of the sixth MOS tube Q6, the gate of the sixth MOS tube Q6 is connected to the in-phase end of the fifth operational amplifier U5, the drain of the sixth MOS tube Q6 is connected to the anode of the second light-emitting diode LED2, and the cathode of the second light-emitting diode LED2 and the other end of the twenty-sixth resistor R26 are connected to the ground end.

[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 MOS tube Q6, the other end of the twenty-fourth resistor R24 ​​is connected to the anode of the first light-emitting diode LED1, and the cathode of the first light-emitting diode LED1 is connected to the ground terminal.

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

[0011] Furthermore, the protection unit also includes a twenty-first resistor R21 and a twenty-second resistor R22, one end of the twenty-first resistor R21 is connected to the gate of the fourth MOS tube Q4 and the fifth connector P5, one end of the twenty-second resistor R22 is connected to the gate of the fifth MOS tube Q5, and the other end of the twenty-first resistor R21 and the other end of the twenty-second resistor R22 are connected to the ground end.

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

[0013] The beneficial effects of the present invention compared with the prior art are:

[0014] The present invention can set a buffer interval based on a buffer start signal and a buffer amount during lithium battery energy storage, and complete the switching of energy storage channels and the jump of the peak charging voltage of the lithium battery based on the buffer interval. It can intermittently adjust the charging current after the voltage jump while ensuring its safety based on the energy storage mode selected by the user. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the prior art and the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0016] Figure 1 The present invention provides an overall structural diagram.

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

[0018] In order to make the objects and advantages of the present invention more clearly understood, the present invention is specifically described below in conjunction with embodiments. It should be understood that the following text is only used to describe one or several specific implementations of the present invention, and does not strictly limit the scope of protection specifically requested by the present invention.

[0019] The present 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 is connected to the protection unit, 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 lithium battery power supply signal, the detection unit is used to detect the temperature of the lithium battery and feed back an over-temperature signal, the clock unit is used to feed back a clock signal required by the protection unit, and the protection unit completes the jump of the energy storage voltage and the current adjustment after the jump under the premise of ensuring the safety of lithium battery energy storage based on the energy storage mode selected by the user and the clock signal feedback of the clock unit. The protection unit comprises a third resistor R3, a fourth resistor R4, and a sixth resistor R 6. A second operational amplifier U2, a second MOS tube Q2, a first connector P1, a fourth connector P4, and a first diode D1. One end of the third resistor R3 is connected to a power supply. The other end of the third resistor R3 is connected to one end of the fourth resistor R4 and the inverting end of the second operational amplifier U2. The output end of the second operational amplifier U2 is connected to the gate of the second MOS tube Q2. The source of the second MOS tube Q2 and the in-phase end of the second operational amplifier U2 are connected to the first connector P1. The drain of the second MOS tube 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 end of the fourth resistor R4 and the other end of 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 in-phase end 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 end of the third operational amplifier U3 is connected to one end of the seventh resistor R7, the inverting end 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 end of the second resistor R2, the other end of the eighth resistor R8, and the other end of the twelfth resistor R12 are connected to the ground end.

[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 MOS tube Q3, wherein 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, the other end of the first resistor R1 is connected to the output end of the first operational amplifier U1, the in-phase end of the first operational amplifier U1 is connected to the output end of the third operational amplifier U3, the inverting end 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 third MOS tube Q3. The fifth pin of the fourth digital potentiometer U4 is connected, the sixth pin of the fourth digital potentiometer U4 is connected to one end of the first transistor Q1 and the drain of the third MOS tube Q3, the gate of the third MOS tube Q3 is connected to the gate of the second MOS tube Q2, the source of the third MOS tube Q3 is connected to the drain of the second MOS tube Q2, the seventh pin of the fourth digital potentiometer U4 is connected to one end of the fourteenth resistor R14 and the output end of the sixth operational amplifier U6, the in-phase end of the sixth operational amplifier U6 is connected to one end of the twenty-third resistor R23, the inverting end of the sixth operational amplifier U6 is connected to the inverting end of the second operational amplifier U2, 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 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 MOS tube Q4, a fifth MOS tube 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, the other end of the twentieth resistor R20 is connected to one end of the fifteenth resistor R15 and the inverting end of the fifth operational amplifier U5, the in-phase end of the fifth operational amplifier U5 is connected to the drain of the fourth MOS tube Q4, and the seventh operational amplifier U The output end of the seventh operational amplifier U7 is connected to the second connector P2, the output end of the fifth operational amplifier U5 is connected 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, the cathode of the third diode D3 is connected to the drain of the fifth MOS tube Q5 and the non-inverting end of the sixth operational amplifier U6, the gate of the fifth MOS tube Q5 is connected to the third connector P3, the source of the fourth MOS tube Q4, the source of the fifth MOS tube Q5, the other end of the thirteenth resistor R13, the other end of the fifteenth resistor R15 and the grounding end are connected.

[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 is connected to one end of the seventeenth resistor R17 and the inverting end of the seventh operational amplifier U7, the other end of the eighteenth resistor R18, one end of the nineteenth resistor R19, the cathode of the second diode D2 are connected to the second connector P2, the anode of the second diode D2 is connected to the drain of the fourth MOS tube Q4, and the other end of the seventeenth resistor R17 and the other end of the nineteenth resistor R19 are connected to the ground.

[0024] Specifically, the protection unit also includes a twenty-fifth resistor R25, a twenty-sixth resistor R26, a sixth MOS tube Q6, and a second light-emitting diode LED2. One end of the twenty-fifth resistor R25 is connected to the power supply, the other end of the twenty-fifth resistor R25 is connected to one end of the twenty-sixth resistor R26 and the source of the sixth MOS tube Q6, the gate of the sixth MOS tube Q6 is connected to the in-phase end of the fifth operational amplifier U5, the drain of the sixth MOS tube Q6 is connected to the anode of the second light-emitting diode LED2, and the cathode of the second light-emitting diode LED2 and the other end of the twenty-sixth resistor R26 are connected to the ground.

[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 MOS tube Q6, the other end of the twenty-fourth resistor R24 ​​is connected to the anode of the first light-emitting diode LED1, and the cathode of the first light-emitting diode LED1 is connected to the ground terminal.

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

[0027] Specifically, the protection unit also includes a twenty-first resistor R21 and a twenty-second resistor R22, one end of the twenty-first resistor R21 is connected to the gate of the fourth MOS tube Q4 and the fifth connector P5, one end of the twenty-second resistor R22 is connected to the gate of the fifth MOS tube Q5, and the other end of the twenty-first resistor R21 and the other end of the twenty-second resistor R22 are connected to the ground end.

[0028] Specifically, the protection unit further includes a twenty-seventh resistor R27, one end of the twenty-seventh resistor R27 is connected to the gate of the sixth MOS transistor Q6, and the other end of the twenty-seventh resistor R27 is connected to the ground.

[0029] See attached Figure 1 , Attachment Figure 2In this embodiment, the power supply unit feeds back the power signal to the first connector P1 on the protection unit, and the signal passes through the source of the second MOS tube Q2, the drain of the second MOS tube Q2, and the sixth resistor R6 to the ground end loop. The signal at the end of the sixth resistor R6 is fed back to the power input end of the lithium battery through the first diode D1 and the fourth connector P4. The lithium battery enters the charging state, and the voltage at the end of the first connector P1 gradually rises. The power signal passes through the third resistor R3 and the fourth resistor R4 to the ground end loop. The signal at the end of the fourth resistor R4 is a buffer start signal lower than the peak voltage allowed for charging of the battery. When charging starts, after the voltage at the end of the first connector P1 rises to the reference signal, the second operational amplifier U2 outputs and feeds back to the gate of the second MOS tube Q2. The fifth resistor R5 discharges the parasitic capacitance of the gate of the second MOS tube Q2. The voltage difference between the gate of the second MOS tube Q2 and the source of the second MOS tube Q2 is higher than the conduction threshold, the second MOS tube Q2 is turned off, and there is no signal feedback at the end of the fourth connector P4. In this way, during the energy storage process of the lithium battery, when the amplitude of the signal at the end of 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 attached Figure 2 In this embodiment, the signal at the first connector P1 end is connected to the ground loop through the second resistor R2, the signal at the second resistor R2 end is fed back to the in-phase end of the third operational amplifier U3 through the ninth resistor R9, the power supply signal is connected to the ground loop through the eleventh resistor R11 and the twelfth resistor R12, the signal at the twelfth resistor R12 end is the buffering amount between the buffer start signal and the peak voltage, the signal at the eleventh resistor R11 end is fed back to the in-phase end of the third operational amplifier U3 through the tenth resistor R10, the signal at the output end of the third operational amplifier U3 is connected to the ground loop through the seventh resistor R7 and the eighth resistor R8, and at the same time, the signal at the eighth resistor R8 end is fed back to the inverting end of the third operational amplifier U3 so that the output end signal of the third operational amplifier U3 is the peak voltage allowed for charging of the lithium battery, thereby providing the peak voltage allowed for charging for the lower circuit during the switching of the energy storage channel.

[0031] See attached Figure 2In this embodiment, when the second operational amplifier U2 outputs, the output terminal signal of the second operational amplifier U2 is synchronously fed back to the gate of the third MOS tube Q3, the voltage difference between the gate of the third MOS tube Q3 and the source of the third MOS tube Q3 is higher than the conduction threshold, the third MOS tube Q3 is turned on, the output terminal signal of the third operational amplifier U3 is fed back to the in-phase terminal of the first operational amplifier U1, the first operational amplifier U1 outputs, and the output terminal signal of the first operational amplifier U1 is fed back through the first resistor R1, the base of the first transistor Q1, and the emitter of the first transistor Q1. To pin 3 and pin 5 of the fourth digital potentiometer U4, at the same time, the first transistor Q1 is turned on, and the power signal is fed back to the inverting terminal of the first operational amplifier U1 after passing through the collector and emitter of the first transistor Q1, so that the voltage signal of the emitter terminal of the first transistor Q1 always follows the voltage signal of the output terminal of the third operational amplifier U3. When the third MOS tube Q3 is turned on, the signal of pin 6 of the fourth digital potentiometer U4 is looped through the first transistor Q1 to the ground terminal, and the first transistor Q1 terminal is looped through the drain of the third MOS tube Q3 and the drain of the third MOS tube Q 3 source, the first diode D1, and the fourth connector P4 are fed back to the power input end of the lithium battery so that the charging voltage of the lithium battery is the peak voltage allowed for charging of the lithium battery. The signal at the end of the fourth resistor R4 is synchronously fed back to the inverting end of the sixth operational amplifier U6. The twenty-third resistor R23 is a pull-down resistor at the inverting end of the sixth operational amplifier U6. The sixth operational amplifier U6 is in a cut-off state. At the same time, the output end signal of the sixth operational amplifier U6 is looped to the ground end via the fourteenth resistor R14. The signal at the end of the fourteenth resistor R14 is fed back to the pin 7 of the fourth digital potentiometer U4. At this time, the pin 2 of the fourth digital potentiometer U4 is at a low level. The fourth digital potentiometer U4 adjusts its own resistance to make the signal at the end of the first transistor Q1 always in a low current state, so that after the energy storage channel is switched, the charging voltage of the lithium battery jumps from any amplitude between the buffer zones to the peak voltage allowed for charging, preventing the lithium battery from continuously storing the lithium battery during the period when the power supply end enters the constant voltage state so that the charging voltage of the lithium battery is higher than the peak voltage allowed for charging, and after jumping to the peak charging voltage, the charging current of the lithium battery is in a normal state.

[0032] See attached Figure 1 , attached Figure 2In this embodiment, the energy storage mode signal is fed back by the user autonomously. The lithium battery is in the normal energy storage mode in the initial state. When the user feeds back the fast energy storage mode signal, the signal is fed back to the seventh operational amplifier U7 in-phase terminal on the protection unit through the second connector P2, and the seventh operational amplifier U7 outputs. The signal at the output terminal of the seventh operational amplifier U7 is fed back to the output terminal of the fifth operational amplifier U5. The power supply signal is fed back to the ground terminal loop through the twentieth resistor R20 and the fifteenth resistor R15. The signal at the end of the fifteenth resistor R15 is fed back to the inverting terminal of the fifth operational amplifier U5. The fifth operational amplifier U5 outputs, the output terminal signal of the fifth operational amplifier U5 passes through the thirteenth resistor R13 to the ground terminal loop, and the signal at the thirteenth resistor R13 end is fed back to the pin 2 of the fourth digital potentiometer U4, and the pin 2 of the fourth digital potentiometer U4 is high level. At the same time, the output terminal signal of the second operational amplifier U2 passes through the third diode D3 and the twenty-third resistor R23 to the ground terminal loop, the sixth operational amplifier U6 is in the output state, and the fourth digital potentiometer U4 stops adjusting. The signal at the second connector P2 end is synchronously fed back to the clock unit, and the clock unit intermittently feeds back the clock signal to The third connector P3 on the protection unit is at a high level when the third connector P3 end obtains a constant signal feedback, and the signal is fed back to the gate of the fifth MOS tube Q5. The twenty-second resistor R22 is used to discharge the gate capacitance of the fifth MOS tube Q5. The voltage difference between the gate of the fifth MOS tube Q5 and the source of the fifth MOS tube Q5 is higher than the conduction threshold, and the fifth MOS tube Q5 is turned on. The output signal of the sixth operational amplifier U6 is looped through the drain of the fifth MOS tube Q5 and the source of the fifth MOS tube Q5 to the ground end, and the sixth operational amplifier U6 is cut off. The fourth digital potentiometer U4 adjusts its own resistance value. The emitter current of the first transistor Q1 increases. When the third connector P3 loses the constant signal feedback, the sixth operational amplifier U6 outputs, the fourth digital potentiometer U4 stops adjusting, and the detection unit detects the temperature of the lithium battery. The safety temperature is set by the detection unit. When the temperature of the lithium battery is higher than the safety temperature, the detection unit feeds back an over-temperature signal to the clock unit, and the clock unit stops the feedback of the clock signal. In this way, when the user selects the fast energy storage mode, the charging voltage is at the peak voltage allowed for charging of the lithium battery, the charging current is gradually increased, and the current regulation is stopped when the temperature of the lithium battery is higher than the safety temperature.

[0033] See attached Figure 2In this embodiment, the power signal is fed through the eighteenth resistor R18 and the nineteenth resistor R19 to the ground loop, and the signal at the nineteenth resistor R19 is fed back to the in-phase terminal of the seventh operational amplifier U7. The power signal is fed through the sixteenth resistor R16 and the seventeenth resistor R17 to the ground loop, and the signal at the seventeenth resistor R17 is fed back to the inverting terminal of the seventh operational amplifier U7. When the user feeds back a fast energy storage mode signal, the signal at the nineteenth resistor R19 rises, and the seventh operational amplifier U7 outputs. The signal at the output terminal of the seventh operational amplifier U7 is fed through the second diode D2 and the nineteenth resistor R19 to the ground loop, so that the seventh operational amplifier U7 outputs normally. When the user feeds back a normal energy storage mode signal, the signal is fed back to the gate of the fourth MOS tube 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 MOS tube Q4, the voltage difference between the gate of the fourth MOS tube Q4 and the source of the fourth MOS tube Q4 is higher than the conduction threshold, the fourth MOS tube Q4 is turned on, the output end signal of the seventh operational amplifier U7 is looped through the drain of the fourth MOS tube Q4 and the source of the fourth MOS tube Q4 to the ground end, and the seventh operational amplifier U7 is normally cut off, so that after the user feeds back a fast / normal energy storage mode signal once, the protection unit can memorize the signal feedback.

[0034] See attached Figure 2 In this embodiment, when the lithium battery is in the normal energy storage mode, the power signal is connected to the ground loop via the twenty-fifth resistor R25 and the twenty-sixth resistor R26, and the signal at the end of the twenty-sixth resistor R26 is connected to the ground loop via the source of the sixth MOS tube Q6, the drain of the sixth MOS tube Q6, and the second light-emitting diode LED2, and the second light-emitting diode LED2 is turned on. The conduction of the second light-emitting diode LED2 is an indication signal of the normal energy storage mode. When the lithium battery is in the fast energy storage mode, the output signal of the seventh operational amplifier U7 is synchronously fed back to the gate of the sixth MOS tube Q6, and the twenty-seventh resistor R27 is used to discharge the parasitic capacitance of the gate of the sixth MOS tube Q6. The voltage difference between the gate of the sixth MOS tube Q6 and the source of the sixth MOS tube Q6 is higher than the conduction threshold, and the sixth MOS tube Q6 is turned off. At the same time, the output signal of the seventh operational amplifier U7 is connected to the ground loop via the twenty-fourth resistor R24 ​​and the first light-emitting diode LED1, and the first light-emitting diode LED1 is turned on. The conduction of the first light-emitting diode LED1 is an indication signal of the fast energy storage mode.

[0035] It will be apparent to those skilled in the art that the 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 the spirit or essential features of the invention. 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, and it is intended that all variations within the meaning and scope of the equivalent elements of the claims be included in the invention. Any marking in a claim should not be considered as limiting the claim to which it relates.

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 is connected to the protection unit, 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 is used to provide a lithium battery power supply signal, the detection unit is used to detect the lithium battery temperature and feedback an overtemperature signal, the clock unit is used to feedback a clock signal required by the protection unit, and the protection unit completes the jump of the energy storage voltage and the current adjustment after the jump under the premise of ensuring the safety of lithium battery energy storage based on the energy storage mode selected by the user and the clock signal feedback of the clock unit. The protection unit includes a third resistor, a fourth resistor, a sixth resistor, a second operational amplifier, a second MOS tube, a first connector, a fourth connector, and a first diode. One end of the third resistor is connected to the power supply, the other end of the third resistor is connected to one end of the fourth resistor and the inverting end of the second operational amplifier, the output end of the second operational amplifier is connected to the gate of the second MOS tube, the source of the second MOS tube, the in-phase end of the second operational amplifier and the first connector are connected, the drain of the second MOS tube 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, and the other end of the fourth resistor and the other end of the sixth resistor are connected to the ground.

2. The circuit protection device for lithium battery energy storage according to claim 1, characterized in that: The protection unit also 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 in-phase end 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 a power supply, the output end of the third operational amplifier is connected to one end of the seventh resistor, the inverting end of the third operational amplifier is connected to the other end of the seventh resistor and one end of the eighth resistor, and the other end of the second resistor, the other end of the eighth resistor, and the other end of the twelfth resistor are connected to the ground.

3. The circuit protection device for lithium battery energy storage according to claim 2, characterized in that: The protection unit also includes 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 MOS tube. The collector of the first transistor and the first pin of the fourth digital potentiometer are connected to the power supply, 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 end of the first operational amplifier, the in-phase end of the first operational amplifier is connected to the output end of the third operational amplifier, the inverting end 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 MOS tube, the gate of the third MOS tube is connected to the gate of the second MOS tube, the source of the third MOS tube is connected to the drain of the second MOS tube, the seventh pin of the fourth digital potentiometer is connected to one end of the fourteenth resistor and the output end of the sixth operational amplifier, the in-phase end of the sixth operational amplifier is connected to one end of the twenty-third resistor, the inverting end of the sixth operational amplifier is connected to the inverting end of the second operational amplifier, the other end of the fourteenth resistor, the other end of the twenty-third resistor, and the other end of the first transistor are connected to the ground.

4. The circuit protection device for lithium battery energy storage according to claim 3, characterized in that: The protection unit also includes a thirteenth resistor, a fifteenth resistor, a twentieth resistor, a fifth operational amplifier, a seventh operational amplifier, a fourth MOS tube, a fifth MOS tube, a second connector, a third connector, and a third diode. One end of the twentieth resistor is connected to the power supply, the other end of the twentieth resistor is connected to one end of the fifteenth resistor and the inverting end of the fifth operational amplifier, the in-phase end of the fifth operational amplifier is connected to the drain of the fourth MOS tube and the output end of the seventh operational amplifier, the in-phase end of the seventh operational amplifier is connected to the second connector, the output end 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 MOS tube and the in-phase end of the sixth operational amplifier, the gate of the fifth MOS tube is connected to the third connector, and the source of the fourth MOS tube, the source of the fifth MOS tube, the other end of the thirteenth resistor, the other end of the fifteenth resistor, and the ground end are connected.

5. The circuit protection device for lithium battery energy storage according to claim 4, 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 is connected to one end of the seventeenth resistor and the inverting end of the seventh operational amplifier, the other end of the eighteenth resistor, one end of the nineteenth resistor, the cathode of the second diode are connected to the second connector, the anode of the second diode is connected to the drain of the fourth MOS tube, and the other end of the seventeenth resistor and the other end of the nineteenth resistor are connected to the ground.

6. The circuit protection device for lithium battery energy storage according to claim 4, characterized in that: The protection unit also includes a twenty-fifth resistor, a twenty-sixth resistor, a sixth MOS tube, and a second light-emitting diode. One end of the twenty-fifth resistor is connected to the power supply, the other end of the twenty-fifth resistor is connected to one end of the twenty-sixth resistor and the source of the sixth MOS tube, the gate of the sixth MOS tube is connected to the in-phase end of the fifth operational amplifier, the drain of the sixth MOS tube is connected to the anode of the second light-emitting diode, and the cathode of the second light-emitting diode and the other end of the twenty-sixth resistor are connected to the ground.

7. The circuit protection device for lithium battery energy storage according to claim 6, 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 tube, the other end of the twenty-fourth resistor is connected to the anode of the first light emitting diode, and the cathode of the first light emitting diode is connected to the ground terminal.

8. The circuit protection device for lithium battery energy storage according to claim 1, characterized in that: The protection unit further includes a fifth resistor, one end of the fifth resistor is connected to the gate of the second MOS tube, and the other end of the fifth resistor is connected to the ground.

9. The circuit protection device for lithium battery energy storage according to claim 4, characterized in that: The protection unit also includes a twenty-first resistor and a twenty-second resistor, one end of the twenty-first resistor is connected to the gate of the fourth MOS tube and the fifth connector, one end of the twenty-second resistor is connected to the gate of the fifth MOS tube, and the other ends of the twenty-first resistor and the twenty-second resistor are connected to the ground end.

10. The circuit protection device for lithium battery energy storage according to claim 6, characterized in that: The protection unit further includes a twenty-seventh resistor, one end of the twenty-seventh resistor is connected to the gate of the sixth MOS tube, and the other end of the twenty-seventh resistor is connected to the ground end.

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