Charging control circuit, battery pack, and electric device

Abstract

The present application discloses a charging control circuit, a battery pack, and an electric device. The charging control circuit comprises a negative voltage isolation module, a charging switch module, and a bleeder module. The negative voltage isolation module is connected to a charging signal, and is configured to isolate negative voltage generated by a charger; the charging switch module is configured to control the connection / disconnection of a charging circuit of an energy storage module; and the bleeder module is configured to bleed charges stored in the charging switch module.

Description

Charging control circuit, battery pack and electric device

[0001] The present application claims priority to the Chinese patent application No. 2024110135278 filed on July 25, 2024 with the China Patent Office, the whole content of the above application being incorporated herein by reference. TECHNICAL FIELD

[0002] The present application relates to the technical field of battery, in particular to a charging control circuit, a battery pack and an electric device. BACKGROUND

[0003] The battery pack is a kind of energy storage device combining multiple battery monomers. The charging and discharging of the battery pack are realized through the charging circuit and the discharging circuit respectively. Switching devices are arranged in the charging circuit and the discharging circuit to control the charging and discharging of the battery pack.

[0004] In the related art, when the battery pack is charging, the charging of the battery pack is realized by the battery management system controlling the switching device in the charging circuit. When the voltage of the charging device is higher than the voltage of the battery pack, there is a risk of generating negative pressure in the charging device. SUMMARY

[0005] However, when the charging device generates negative pressure, the electric charge in the charging device will continuously accumulate in the switching device of the charging circuit, and the switching device cannot be normally turned off under the action of the electric charge, thereby causing low reliability and safety of the charging of the battery pack.

[0006] In a first aspect, the present application provides a charging control circuit, which comprises:

[0007] A negative pressure isolation module, a first end of the negative pressure isolation module being connected to a charging signal; the negative pressure isolation module is configured to isolate the negative pressure generated by the charger;

[0008] A charging switch module, a control end of the charging switch module being connected to a second end of the negative pressure isolation module, a first end of the charging switch module being connected to the energy storage module, and a second end of the charging switch module being connected to the charger; the charging switch module is configured to control whether the charging circuit of the energy storage module is turned on;

[0009] A bleeding module, a first end and a second end of the bleeding module being connected to the control end of the charging switch module, and a third end of the bleeding module being connected to the second end of the charging switch module; the bleeding module is configured to release the electric charge stored in the charging switch module to turn off the charging switch module.

[0010] In a second aspect, the present application provides a battery pack, which comprises: an energy storage module, a battery management module, a discharging control circuit and the charging control circuit provided in the first aspect.

[0011] The energy storage module is connected with the battery management module, the discharging control circuit and the charging control circuit respectively, and the battery management module is also connected with the discharging control circuit and the charging control circuit;

[0012] The energy storage module is configured to store electric energy; the battery management module is configured to generate a charging signal or a discharging signal; the charging control circuit is configured to control the conduction of the charging loop of the energy storage module according to the charging signal; and the discharging control circuit is configured to control the conduction of the discharging loop of the energy storage module according to the discharging signal.

[0013] In a third aspect, the present application provides a battery pack. Advantages

[0014] By arranging the negative pressure isolation module, the charging switch module and the discharge module in the charging control circuit, when the negative pressure is generated in the charger, the negative pressure can be isolated by the negative pressure isolation module, and the parasitic charge in the charging switch module can be discharged by the discharge module, so as to consume the charge in the switch module, thereby realizing the turn-off of the switch module, and further facilitating to avoid the influence of the negative pressure generated by the charger on the conduction or turn-off of the charging switch module, and improving the charging reliability and safety. BRIEF DESCRIPTION OF DRAWINGS

[0015] FIG. 1 is a first schematic diagram of the charging control circuit provided by the present application;

[0016] FIG. 2 is a second schematic diagram of the charging control circuit provided by the present application;

[0017] FIG. 3 is a third schematic diagram of the charging control circuit provided by the present application;

[0018] FIG. 4 is a fourth schematic diagram of the charging control circuit provided by the present application;

[0019] FIG. 5 is a fifth schematic diagram of the charging control circuit provided by the present application;

[0020] FIG. 6 is a first schematic diagram of the battery pack provided by the present application;

[0021] FIG. 7 is a second schematic diagram of the battery pack provided by the present application;

[0022] FIG. 8 is a schematic diagram of the external control module provided by the present application;

[0023] FIG. 9 is a schematic diagram of the electric vehicle provided by the present application.

[0024] Explanation of reference signs:

[0025] 10, charging control circuit; 110, negative voltage isolation module; 111, anti-interference unit; 112, switch isolation unit; 120, charging switch module; 130, discharge module; 20, discharging control circuit; 21, driving module; 22, discharging switch module; 23, external control module; 200, charger; 30, battery management module; 40, energy storage module; 1000, electric vehicle; 2000, battery pack. Embodiments of the present application

[0026] The present application provides a charging control circuit. The charging control circuit is beneficial to avoid the influence of negative voltage generated by the charger on the charging switch module, and improve the charging reliability and safety. Please refer to FIG. 1, which is a first schematic diagram of the charging control circuit provided by the present application. As shown in FIG. 1, the charging control circuit comprises a negative voltage isolation module 110, a charging switch module 120 and a discharge module 130.

[0027] The first end of the negative voltage isolation module 110 is connected to the charging signal CHG; the negative voltage isolation module 110 is configured to isolate the negative voltage generated by the charger 200; the control end of the charging switch module 120 is connected to the second end of the negative voltage isolation module 110; the first end of the charging switch module 120 is connected to the energy storage module 40; the second end of the charging switch module 120 is connected to the charger 200; the charging switch module 120 is configured to control whether the charging loop of the energy storage module 40 is turned on; the first end and the second end of the discharge module 130 are both connected to the control end of the charging switch module 120; the third end of the discharge module 130 is connected to the second end of the charging switch module 120; the discharge module 130 is configured to release the charge stored in the charging switch module 120 to turn off the charging switch module.

[0028] Specifically, the charging control circuit obtains the charging signal CHG through the negative voltage isolation module 110, and the negative voltage isolation module 110 transmits the charging signal CHG to the charging switch module 120. The charging switch module 120 controls the charging loop of the energy storage module 40 to be turned on according to the charging signal CHG, so as to charge the energy storage module 40. When the charger 200 generates negative voltage, the negative voltage isolation module 110 isolates the negative voltage generated by the charger 200, so as to prevent the impact of the negative voltage generated by the charger 200 on the signal source of the charging signal CHG. Exemplarily, the signal source of the charging signal CHG can be a battery management system, and in actual application, different signal sources can be selected to generate the charging signal CHG according to actual conditions, which is not limited in the present embodiment.

[0029] When the charging of the energy storage module 40 is completed, the charging signal CHG obtained by the negative voltage isolation module 110 is interrupted, at this time, the charging switch module 120 is turned off, and because there is negative voltage in the charger 200, the electric charge in the charger 200 is continuously moved to the charging switch module 120, and the electric charge in the charging switch module 120 is continuously accumulated, and the charging switch module 120 is maintained in the on state. At this time, because the charging signal CHG required for the on of the charging switch module 120 is interrupted, in the charging control circuit, only the charging switch module 120 and the discharge module 130 exist, the parasitic charge in the charging switch module 120 drives the discharge module 130, at this time, the discharge module 130 releases the parasitic charge to consume the charge in the charging switch module 120, thereby turning off the charging switch module 120.

[0030] The application sets the negative voltage isolation module 110, the charging switch module 120 and the discharge module 130 in the charging control circuit, when the negative voltage is generated in the charger 200, the negative voltage is isolated by the negative voltage isolation module 110, and the parasitic charge in the charging switch module 120 is released by the discharge module 130 to consume the charge in the charging switch module 120, thereby realizing the turn-off of the charging switch module 120, and further facilitating to avoid the influence of the negative voltage generated by the charger 200 on the on or off of the charging switch module, and improving the charging reliability and safety.

[0031] Please refer to FIG. 2, which is a second schematic diagram of the charging control circuit provided by the application.

[0032] In one embodiment, as shown in FIG. 2, the negative voltage isolation module 110 includes an anti-interference unit 111 and a switch isolation unit 112.

[0033] The input end of the anti-interference unit 111 is connected to the charging signal CHG; the output end of the anti-interference unit 111 is connected to the first end of the switch isolation unit 112; the second end of the switch isolation unit 112 is connected to the charging switch module 120; the anti-interference unit 111 is configured to prevent external voltage interference; and the switch isolation unit 112 is configured to isolate the negative voltage generated by the charger 200.

[0034] Specifically, when charging the energy storage module 40, the charging control circuit is often in a working environment with high voltage, therefore, it is necessary to set the anti-interference unit 111 to suppress the interference caused by external high voltage, so as to avoid the influence of external high voltage on the transmission of the charging signal CHG.

[0035] The charging control circuit obtains the charging signal CHG through the switch isolation unit 112, and the switch isolation unit 112 transmits the charging signal CHG to the charging switch module 120. The charging switch module 120 controls the charging loop of the energy storage module 40 to be conducted according to the charging signal CHG, so as to charge the energy storage module 40. When the charger 200 generates negative pressure, the switch isolation unit 112 isolates the negative pressure generated by the charger 200, so as to prevent the negative pressure generated by the charger 200 from impacting or affecting the signal source of the charging signal CHG.

[0036] Please refer to FIG. 3, which is a third schematic diagram of the charging control circuit provided by the present application.

[0037] In an embodiment, as shown in FIG. 3, the switch isolation unit 112 comprises a first triode Q1, a first resistor R22 and a first diode D5.

[0038] The base of the first triode Q1 is connected with the first end of the first resistor R22, the second end of the first resistor R22 is grounded, the emitter of the first triode Q1 is connected with the anti-interference unit 111, the collector of the first triode Q1 is connected with the anode of the first diode D5, and the cathode of the first diode D5 is connected with the charging switch module 120.

[0039] Specifically, when the charger 200 generates negative pressure, the high-voltage resistance between the base and the collector of the first triode Q1 is used to prevent the negative pressure generated by the charger 200 from impacting or affecting the signal source of the charging signal CHG. It should be noted that the model of the first triode Q1 can be selected according to actual needs, and the present embodiment does not limit this.

[0040] Optionally, still referring to FIG. 3, an equal-potential resistor R19 can be connected in parallel between the base and the emitter of the first triode Q1, so that the emitter and the base of the first triode Q1 have the same potential when the charging signal CHG is interrupted, thereby ensuring that the first triode Q1 is effectively turned off when the charging signal CHG is interrupted.

[0041] In an embodiment, still referring to FIG. 3, the anti-interference unit 111 comprises an anti-interference resistor R15, the first end of the anti-interference resistor R15 is connected to the charging signal CHG, and the second end of the anti-interference resistor R15 is connected with the switch isolation unit 112. It should be noted that the resistance value of the anti-interference resistor R15 can be selected according to actual needs, and the present embodiment does not limit this. For example, the anti-interference resistor R15 can be 1000Ω.

[0042] Please refer to FIG. 4, which is a fourth schematic diagram of the charging control circuit provided by the present application. In an embodiment, as shown in FIG. 4, the discharge module 130 comprises a second triode Q4, a second resistor R8, a third triode Q3 and a discharge resistor R7.

[0043] The base of the second triode Q4 is connected with the first end of the second resistor R8; the second end of the second resistor R8 is connected with the charging switch module 120; the base of the second triode Q4 is also connected with the negative voltage isolation module 110; the emitter of the second triode Q4 is connected with the base of the third triode Q3; the collector of the second triode Q4 is connected with the second end of the second resistor R8; the emitter of the third triode Q3 is connected with the charging switch module 120; the collector of the third triode Q3 is connected with the first end of the bleeder resistor R7; the second end of the bleeder resistor R7 is connected with the second end of the second resistor R8.

[0044] Specifically, the parasitic charge in the charging switch module 120 drives the second triode Q4 and the third triode Q3 through the second resistor R8, at this time, the second triode Q4 and the third triode Q3 amplify the current generated by the parasitic charge, and the bleeder resistor R7 absorbs the amplified current generated by the parasitic charge to consume the charge in the charging switch module 120, so as to turn off the charging switch module 120.

[0045] Please refer to FIG. 5, which is a fifth schematic diagram of the charging control circuit provided by the present application. FIG. 5 exemplarily shows the case that there is only one switch tube in the charging switch module 120.

[0046] In an embodiment, as shown in FIG. 5, the charging switch module 120 comprises a third resistor R38 and a charging switch tube Q5.

[0047] The control end of the charging switch tube Q5 is connected with the negative voltage isolation module 110; the first end of the charging switch tube Q5 is connected with the energy storage module 40; the second end of the charging switch tube Q5 is connected with the charger 200; the third resistor R38 is connected between the second end of the negative voltage isolation module 110 and the second end of the charging switch tube Q5.

[0048] Optionally, still referring to FIG. 5, the second diode D6, the current-limiting resistor R6 and the voltage stabilizing diode D7 can also be arranged in the charging switch module 120; the anode of the second diode D6 is connected with the negative voltage isolation module 110, the cathode of the second diode D6 is connected with the control end of the charging switch tube Q5; the voltage stabilizing diode D7 is arranged between the control end of the charging switch tube Q5 and the second end of the charging switch tube Q5; the current-limiting resistor R6 is arranged between the control end of the charging switch tube Q5 and the negative voltage isolation module 110, the current-limiting resistor R6 limits the current flowing into the charging switch tube Q5, thereby protecting the charging switch tube Q5

[0049] The application further provides a battery pack. Please refer to FIG. 6, which is a first schematic diagram of the battery pack provided by the application. As shown in FIG. 6, the battery pack comprises an energy storage module 40, a battery management module 30, a discharge control circuit 20 and the charging control circuit 10 provided by any of the above embodiments. The energy storage module 40 is connected with the battery management module 30, the discharge control circuit 20 and the charging control circuit 10 respectively; the battery management module 30 is further connected with the discharge control circuit 20 and the charging control circuit 10; the energy storage module 40 is configured to store electric energy; the battery management module 30 is configured to generate a charging signal or a discharging signal; the charging control circuit 10 is configured to control the conduction of a charging loop of the energy storage module 40 according to the charging signal; and the discharge control circuit 20 is configured to control the conduction of a discharging loop of the energy storage module 40 according to the discharging signal.

[0050] It should be noted that the battery pack provided by the embodiments of the application has the beneficial effects of the charging control circuit 10 provided by any of the above embodiments, which will not be described herein again.

[0051] Optionally, in some embodiments, the battery management module 30 comprises a signal control terminal configured to control the generation of the discharging signal.

[0052] Please refer to FIG. 7, which is a second schematic diagram of the battery pack provided by the application. As shown in FIG. 7, the discharge control circuit 20 comprises a driving module 21, a discharge switch module 22 and an external control module 23.

[0053] The input terminal of the driving module 21 is connected with the discharging signal output terminal of the battery management module 30; the output terminal of the driving module 21 is connected with the discharge switch module 22; the external control module 23 is connected with the signal control terminal of the battery management module 30; the driving module 21 is configured to drive the discharge switch module 22; the discharge switch module 22 is configured to control the conduction of the discharging loop of the energy storage module 40 according to the discharging signal; and the external control module 23 is configured to manually disable the discharging signal of the battery management module 30.

[0054] Specifically, the external control module 23 is manually controlled by a user, and the external control module 23 is configured to generate a disabling signal. When the battery management module 30 acquires the disabling signal, the battery management module 30 disables the discharging signal accordingly, and the form of disabling the discharging signal by the battery management module 30 can be, for example, disabling the generation of the discharging signal or disabling the output of the discharging signal, which is not limited in the embodiment.

[0055] Please refer to FIG. 8, which is a schematic diagram of the external control module provided by the application.

[0056] In some embodiments, as shown in FIG. 8, the external control module 23 comprises: a first control resistor R1, a control switch JP1, a second control resistor R2, a third control resistor R3, and a control capacitor C4.

[0057] The first control resistor R1, the control switch JP1, the second control resistor R2, and the third control resistor R3 are connected in series in sequence; the first control resistor R1 is further connected with the power voltage VCC_5V; the third control resistor R3 is grounded; the third control resistor R3 is further connected with the signal control terminal CTLD; and the control capacitor C4 is connected in parallel with the third control resistor R3.

[0058] Specifically, when the control switch JP1 is closed, the signal control terminal CTLD is pulled to high level, and the battery management module 30 can normally generate and / or output the discharge signal; when the control switch JP1 is opened, the signal control terminal CTLD is pulled to low level, at this time, the battery management module 30 disables the discharge signal.

[0059] In some embodiments, the application further provides a power consumption device. The power consumption device comprises the battery pack provided by any of the above embodiments.

[0060] Exemplarily, the power consumption device can be an electric vehicle. Please refer to FIG. 9, which is a schematic diagram of an electric vehicle provided by the application. As shown in FIG. 9, the structure of the electric vehicle 1000 is shown in the figure. Among them, the electric vehicle 1000 provided by the present embodiment has the beneficial effects of the battery pack 2000 provided by any of the above embodiments, which will not be repeated here.

Claims

1. A charging control circuit, comprising: a negative voltage isolation module (110), a first end of the negative voltage isolation module (110) being connected to a charging signal; the negative voltage isolation module (110) being configured to isolate a negative voltage generated by a charger (200); a charging switch module (120), a control end of the charging switch module (120) being connected to a second end of the negative voltage isolation module (110), a first end of the charging switch module (120) being connected to an energy storage module (40), and a second end of the charging switch module (120) being connected to the charger (200); the charging switch module (120) being configured to control whether a charging loop of the energy storage module (40) is turned on; a discharge module (130), a first end and a second end of the discharge module (130) being connected to the control end of the charging switch module (120), and a third end of the discharge module (130) being connected to the second end of the charging switch module (120); the discharge module (130) being configured to release the charge stored in the charging switch module (120) to turn off the charging switch module (120).

2. The charge control circuit according to claim 1, wherein The negative voltage isolation module (110) comprises an anti-interference unit (111) and a switch isolation unit (112); an input end of the anti-interference unit (111) is connected to the charging signal, an output end of the anti-interference unit (111) is connected to a first end of the switch isolation unit (112), and a second end of the switch isolation unit (112) is connected to the charging switch module (120); the anti-interference unit (111) is configured to prevent external voltage interference; and the switch isolation unit (112) is configured to isolate the negative voltage generated by the charger (200).

3. The charge control circuit according to claim 2, wherein The switch isolation unit (112) comprises a first transistor (Q1), a first resistor (R22), and a first diode (D5); a base of the first transistor (Q1) is connected to a first end of the first resistor (R22), a second end of the first resistor (R22) is grounded, an emitter of the first transistor (Q1) is connected to the anti-interference unit (111), a collector of the first transistor (Q1) is connected to an anode of the first diode (D5), and a cathode of the first diode (D5) is connected to the charging switch module (120).

4. The charge control circuit according to claim 2, wherein, The anti-interference unit (111) comprises an anti-interference resistor (R15); a first end of the anti-interference resistor (R15) is connected to the charging signal, and a second end of the anti-interference resistor (R15) is connected to the switch isolation unit (112).

5. The charge control circuit according to claim 1, wherein, The discharge module (130) comprises a second transistor (Q4), a second resistor (R8), a third transistor (Q3), and a discharge resistor (R7). The base of the second triode (Q4) is connected with the first end of the second resistor (R8), the second end of the second resistor (R8) is connected with the charging switch module (120), the base of the second triode (Q4) is also connected with the negative voltage isolation module (110), the emitter of the second triode (Q4) is connected with the base of the third triode (Q3), the collector of the second triode (Q4) is connected with the second end of the second resistor (R8), the emitter of the third triode (Q3) is connected with the charging switch module (120), the collector of the third triode (Q3) is connected with the first end of the bleeder resistor (R7), and the second end of the bleeder resistor (R7) is connected with the second end of the second resistor (R8).

6. The charge control circuit according to claim 1, wherein, The charging switch module (120) comprises a third resistor (R38) and at least one charging switch tube (Q5). The control end of each charging switch tube (Q5) is connected with the negative voltage isolation module (110), the first end of the first charging switch tube (Q5) is connected with the energy storage module (40), the second end of the first charging switch tube (Q5) is connected with the first end of the next charging switch tube (Q5), the second end of the last charging switch tube (Q5) is connected with the charger (200), and the third resistor (R38) is connected between the second end of the negative voltage isolation module (110) and the second end of the last charging switch tube (Q5).

7. A battery pack comprising: The energy storage module (40), the battery management module (30), the discharge control circuit (20) and the charging control circuit (10) according to any one of claims 1-6; The energy storage module (40) is connected with the battery management module (30), the discharge control circuit (20) and the charging control circuit (10) respectively, and the battery management module (30) is also connected with the discharge control circuit (20) and the charging control circuit (10); The energy storage module (40) is configured to store electric energy, the battery management module (30) is configured to generate a charging signal or a discharging signal, the charging control circuit (10) is configured to control a charging loop of the energy storage module (40) to be turned on according to the charging signal, and the discharge control circuit (20) is configured to control a discharging loop of the energy storage module (40) to be turned on according to the discharging signal.

8. The battery pack of claim 7, wherein, The battery management module (30) comprises a signal control terminal (CTLD) configured to control generation of the discharging signal, and the discharge control circuit (20) comprises a driving module (21), a discharge switch module (22) and an external control module (23). The input end of the driving module (21) is connected with the discharging signal output end of the battery management module (30), the output end of the driving module (21) is connected with the discharge switch module (22), and the external control module (23) is connected with the signal control terminal (CTLD) of the battery management module (30). The driving module (21) is configured to drive the discharge switch module (22); the discharge switch module (22) is configured to control the discharge loop of the energy storage module (40) to be conducted according to the discharge signal; and the external control module (23) is configured to manually disable the discharge signal of the battery management module (30).

9. The battery pack of claim 8, wherein, The external control module (23) comprises a first control resistor (R1), a control switch (JP1), a second control resistor (R2), a third control resistor (R3) and a control capacitor (C4). The first control resistor (R1), the control switch (JP1), the second control resistor (R2) and the third control resistor (R3) are connected in series, the first control resistor (R1) is further connected with a power voltage, the third control resistor (R3) is grounded, the third control resistor (R3) is further connected with the signal control terminal (CTLD), and the control capacitor (C4) is connected with the third control resistor (R3) in parallel.

10. An electric device comprising the battery pack according to any one of claims 7-9.

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