Charging activation circuit of lithium battery and charging equipment

Abstract

The utility model relates to the technical field of lithium battery charging, and discloses a lithium battery charging activation circuit and charging equipment, and the circuit comprises a lithium battery, a power supply circuit, a detection circuit, an output circuit and a control module. The power supply circuit is connected with the lithium battery; the input end of the detection circuit is connected with the lithium battery, and the detection circuit detects the current battery voltage of the lithium battery; the output end of the output circuit is connected with the lithium battery, and the output circuit outputs activation voltage to the lithium battery; the control module is connected with the output end of the detection circuit, the input end of the output circuit and the power supply circuit, receives the battery voltage, determines that the battery voltage is normal so as to determine that the current lithium battery is in a protection state, sends activation voltage, activates the lithium battery in the protection state, and quickly activates the lithium battery in a short time. The chemical reaction in the battery is stimulated, the lithium battery is allowed to continue to be charged, the power supply circuit can charge the lithium battery conveniently, the charging efficiency is improved, and the charging experience feeling of a user is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of lithium battery charging, and particularly relates to a charging activation circuit and a charging device for a lithium battery. Background Technique

[0002] In order to ensure the safety and effectiveness of a lithium battery during charging and extend the service life of the lithium battery, a charging protection board (also called a battery protection board or a battery management system BMS) is provided in most lithium batteries applied in products.

[0003] In the prior art, when using a charging device to charge a lithium battery, when the voltage output by the charging device is lower than a certain threshold, but the charging device can still charge the lithium battery, the charging protection board will cut off the connection between the lithium battery and the charging device in advance, so that the charging device cannot continue to charge the lithium battery, reducing the charging efficiency of the charging device and affecting the charging experience of users. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a charging activation circuit and a charging device for a lithium battery to solve one or more technical problems existing in the prior art, and at least provide a beneficial choice or create conditions.

[0005] The solution of the utility model to solve its technical problems is: to provide a charging activation circuit and a charging device for a lithium battery. In an embodiment of the first aspect of the utility model, a charging activation circuit for a lithium battery includes:

[0006] A lithium battery;

[0007] A power supply circuit, the power supply circuit is connected to the lithium battery;

[0008] A detection circuit, the input end of the detection circuit is connected to the lithium battery, and the detection circuit is used to detect the battery voltage of the current lithium battery;

[0009] An output circuit, the output end of the output circuit is connected to the lithium battery, and the output circuit is used to receive an activation voltage and output the activation voltage to the lithium battery;

[0010] A control module, the control module is respectively connected to the output end of the detection circuit, the input end of the output circuit and the power supply circuit, the control module receives the battery voltage and outputs the activation voltage to a pulse activation voltage.

[0011] Further, a charging activation circuit for a lithium battery further includes: a regulation circuit;

[0012] The output terminals of the regulation circuit are respectively connected to the power supply circuit and the lithium battery. The input terminal of the regulation circuit is connected to the control module. The regulation circuit is used to receive the regulation signal output by the control module and control the on-off between the power supply circuit and the lithium battery.

[0013] Furthermore, the lithium battery is connected with a charging protection board, and the lithium battery is provided with a positive terminal and a negative terminal;

[0014] The positive terminal of the lithium battery is respectively connected to the output terminal of the regulation circuit, the input terminal of the detection circuit, and the output terminal of the output circuit through the charging protection board;

[0015] The negative terminal of the lithium battery is respectively connected to the input terminal of the detection circuit and the power supply circuit through the charging protection board.

[0016] Furthermore, the regulation circuit includes:

[0017] An amplification circuit, the input terminal of the amplification circuit is connected to the control module;

[0018] A relay, the driving terminal of the relay is connected to the output terminal of the amplification circuit, the normally closed terminal of the relay is connected to the power supply circuit, and the normally open terminal of the relay is left floating;

[0019] A fuse, the fuse is respectively connected to the common terminal of the relay and the lithium battery.

[0020] Furthermore, the detection circuit includes:

[0021] A first sampling circuit, the input terminal of the first sampling circuit is connected to the positive terminal of the lithium battery, and the output terminal of the first sampling circuit is connected to the control module;

[0022] A second sampling circuit, the input terminal of the second sampling circuit is connected to the negative terminal of the lithium battery, and the output terminal of the second sampling circuit is connected to the control module.

[0023] Furthermore, the output circuit includes:

[0024] A first resistor, one end of the first resistor is connected to the control module;

[0025] A first triode, the base of the first triode is connected to the other end of the first resistor, the emitter of the first triode is connected to an external auxiliary power supply, and the collector of the first triode is connected to the lithium battery.

[0026] Furthermore, the regulation circuit further includes: a freewheeling diode;

[0027] The anode of the freewheeling diode is respectively connected to the driving terminal of the relay and the output terminal of the amplification circuit, and the cathode of the freewheeling diode is connected to the driving terminal of the relay.

[0028] Further, the control module is a single-chip microcomputer control module.

[0029] Further, the activation voltage is a group of pulse voltages with a time length of 2 seconds.

[0030] In an embodiment of the second aspect of the present invention, a charging device includes: a charging activation circuit for a lithium battery as described in the embodiment of the first aspect of the present invention.

[0031] The beneficial effects of the present invention are as follows: By obtaining the battery voltage of the lithium battery through the detection circuit, the control module receives the battery voltage and determines that the battery voltage is normal, thereby determining that the current lithium battery is in a protected state. An activation voltage is output to the lithium battery through the output circuit to quickly activate the lithium battery within a short time, stimulating the chemical reaction inside the battery, thereby allowing the lithium battery to continue charging, facilitating the power supply circuit to charge the lithium battery, and thus improving the charging efficiency and the charging experience of users. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 is a partial circuit schematic diagram of a charging activation circuit for a lithium battery provided by an embodiment of the present invention;

[0033] Figure 2 is a partial circuit schematic diagram of a charging activation circuit for a lithium battery provided by another embodiment of the present invention;

[0034] Figure 3 is a framework schematic diagram of a charging activation circuit for a lithium battery provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0035] In order to make the objectives, technical solutions, and advantages of the present application clearer, the present application will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and should not be construed as limiting the present invention.

[0036] It should be noted that although the functional modules are divided in the schematic diagram, in some cases, they may be divided differently from those in the system.

[0037] In addition, the terms "first" and "second" are only used for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more features.

[0038] In the description of the present utility model, it should be noted that unless otherwise clearly defined, terms such as "setting", "installation", and "connection" should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above terms in the present utility model in combination with the specific content of the technical solution.

[0039] In order to ensure the safety and effectiveness of lithium batteries during charging and at the same time extend the service life of lithium batteries, a charging protection board (also known as a battery protection board or a battery management system BMS) is provided in most of the lithium batteries used in products.

[0040] In the prior art, when using a charging device to charge a lithium battery, when the voltage output by the charging device is lower than a certain threshold but the charging device can still charge the lithium battery, the charging protection board will cut off the connection between the lithium battery and the charging device in advance, so that the charging device cannot continue to charge the lithium battery, reducing the charging efficiency of the charging device and affecting the charging experience of users.

[0041] Referring to Figure 1 and Figure 3 , in some embodiments of the first aspect of the present utility model, a charging activation circuit for a lithium battery includes: a lithium battery 100, a power supply circuit 200, a detection circuit 300, an output circuit 400, and a control module 500.

[0042] The lithium battery 100 is electrically connected to the power supply circuit 200, and the power supply circuit 200 is electrically connected to the control module 500. The power supply circuit 200 is used to charge the lithium battery 100.

[0043] The lithium battery 100 is electrically connected to the input end of the detection circuit 300, and the output end of the detection circuit 300 is electrically connected to the input end of the control module 500. The detection circuit 300 can detect the current battery voltage of the lithium battery 100 and send the battery voltage to the control module 500.

[0044] The lithium battery 100 is electrically connected to the output end of the output circuit 400, and the input end of the output circuit 400 is electrically connected to the output end of the control module 500. The output circuit 400 can output the activation voltage output by the control module 500 to the lithium battery 100.

[0045] The input end of the control module 500 is electrically connected to the output end of the detection circuit 300, and the output end of the control module 500 is electrically connected to the input end of the output circuit 400.

[0046] The control module 500 can receive the battery voltage sent by the detection circuit 300. When the battery voltage is within the set voltage protection range, the control module 500 determines that the battery voltage is normal, thereby determining that the current lithium battery 100 is in a protected state, and sends an activation voltage to the lithium battery 100 through the output circuit 400 to activate the lithium battery 100 in the protected state.

[0047] In one embodiment, when the power supply circuit between the power supply circuit 200 and the lithium battery 100 is disconnected, the control module 500 first detects whether the battery voltage is normal through the detection circuit 300. When the battery voltage is within the set voltage protection range, the battery voltage is considered normal, and the lithium battery 100 enters the protection state. The control module 500 sends an activation voltage to the lithium battery 100 through the output circuit 400 to activate the lithium battery 100.

[0048] Among them, the control module 500 uses a single-chip microcomputer to achieve control, receives the battery voltage through the single-chip microcomputer, and sends the activation voltage to the output circuit 400. The activation voltage is a group of pulse voltages with a time length of 2 seconds. The pulse voltage is a voltage of weak current.

[0049] When the lithium battery 100 is in the protection state, multiple protection circuits provided on the charging protection board are activated, thereby restricting or stopping the charging and discharging process of the lithium battery 100, preventing the lithium battery 100 from being damaged and even causing danger. By briefly increasing the voltage or current of the battery through the activation voltage, the chemical reaction inside the battery is stimulated, the protection state of the lithium battery 100 is released, and it temporarily overcomes the energy barrier generated by overcharging or over-discharging, so that lithium ions are allowed to continue to move inside the battery. So that the lithium battery 100 in the protection state can continue to charge after being activated by pulses, thereby improving the charging efficiency and the user's charging experience. And after being activated by pulses, the charging and discharging process of the lithium battery 100 can still be monitored by the charging protection board to ensure the safety and stability of the lithium battery 100.

[0050] Refer to Figure 1 and Figure 3 In some embodiments of the first aspect of the present invention, the lithium battery 100 is provided with a charging protection board, the lithium battery 100 is electrically connected to the charging protection board, and the lithium battery 100 is provided with a positive electrode terminal and a negative electrode terminal.

[0051] The positive electrode terminal of the lithium battery 100 is electrically connected to the output terminal of the output circuit 400, the positive electrode terminal of the lithium battery 100 is electrically connected to the input terminal of the detection circuit 300, and the positive electrode terminal of the lithium battery 100 is electrically connected to the output terminal of the regulation circuit 600.

[0052] The negative electrode terminal of the lithium battery 100 is electrically connected to the negative electrode output terminal of the power supply circuit 200, and the negative electrode terminal of the lithium battery 100 is electrically connected to the input terminal of the detection circuit 300.

[0053] Refer to Figure 2 In some embodiments of the first aspect of the present invention, the charging activation circuit further includes: a regulation circuit 600.

[0054] The output terminal of the regulation circuit 600 is electrically connected to the positive output terminal of the power supply circuit 200, and the output terminal of the regulation circuit 600 is also electrically connected to the positive terminal of the lithium battery 100.

[0055] The control module 500 sends a regulation signal to the regulation circuit 600. The regulation circuit 600 can receive the regulation signal and adjust the on-off between the power supply circuit 200 and the lithium battery 100.

[0056] In one embodiment, when the charging device is powered on, the control module 500 sends a regulation signal to disconnect the charging circuit between the power supply circuit 200 and the lithium battery 100 through the regulation circuit 600, so that the detection circuit 300 can detect the battery voltage.

[0057] In one embodiment, after the control module 500 sends an activation voltage, when the battery voltage is within the set charging voltage range, the control module 500 outputs a regulation signal to connect the charging circuit between the power supply circuit 200 and the lithium battery 100 through the regulation circuit 600, so that the power supply circuit 200 continues to charge the lithium battery 100.

[0058] The regulation circuit 600 includes: a relay K1, an amplification circuit 610, a fuse FUS, and a freewheeling diode D1.

[0059] The output terminal of the control module 500 is electrically connected to the input terminal of the amplification circuit 610. The output terminal of the amplification circuit 610 is electrically connected to the driving terminal of the relay K1. The common terminal of the relay K1 is electrically connected to one end of the fuse FUS. The normally closed terminal of the relay K1 is electrically connected to the positive output terminal of the power supply circuit 200. The normally open terminal of the relay K1 is left floating.

[0060] Among them, the amplification circuit 610 includes: a second diode Q2, a sixth resistor R6, and a seventh resistor R7.

[0061] The base of the second diode Q2 is connected to the output terminal of the control module through the seventh resistor R7. The emitter of the second diode Q2 is grounded. The collector of the second diode Q2 is electrically connected to the driving terminal of the relay K1 and the anode of the freewheeling diode D1 respectively. One end of the sixth resistor R6 is grounded, and the other end of the sixth resistor R6 is electrically connected to the seventh resistor R7 and the base of the second diode Q2 respectively.

[0062] In one embodiment, when the charging device is powered on, the control module 500 sends a regulation signal. In this embodiment, the regulation signal is a low-level signal. The amplifying circuit 610 processes the regulation signal and outputs it to the driving end of the relay K1. The driving coil of the relay K1 loses power, the switch of the relay K1 is switched to the normally open position, the relay K1 is disconnected, and the circuit between the power supply circuit 200 and the lithium battery 100 is disconnected, and charging is not performed, so that the detection circuit 300 can detect the battery voltage and prevent the lithium battery 100 from being damaged due to an abnormal state.

[0063] In another embodiment, after the control module 500 sends an activation voltage, when the battery voltage is within the set charging voltage range, the control module 500 sends a regulation signal. In this embodiment, the regulation signal is a high-level signal. The amplifying circuit 610 processes the regulation signal and outputs it to the driving end of the relay K1. The driving coil of the relay K1 is powered on, the switch of the relay K1 is switched to the normally closed position, the relay K1 is closed, and the circuit between the power supply circuit 200 and the lithium battery 100 is connected, and the power supply circuit 200 charges the lithium battery 100.

[0064] After the lithium battery 100 receives the activation voltage, the control module 500 re-detects the battery voltage. When it is determined that the battery voltage is within the set charging range, the relay K1 is controlled to close, and the circuit between the power supply circuit 200 and the lithium battery 100 is connected, so that the charging and discharging process of the lithium battery 100 is still strictly monitored by its internal charging protection board to ensure the safety and stability of the battery.

[0065] Refer to Figure 1 and Figure 2 In some embodiments of the first aspect of the present invention, the detection circuit 300 includes: a first sampling circuit and a second sampling circuit.

[0066] The input end of the first sampling circuit is electrically connected to the positive terminal of the lithium battery 100, and the input end of the second sampling circuit is electrically connected to the negative terminal of the lithium battery 100. The output ends of the first sampling circuit and the second sampling circuit are both electrically connected to the input end of the control module 500.

[0067] Among them, the first sampling circuit includes: a second resistor R2, a third resistor R3, and a first capacitor C1.

[0068] One end of the second resistor R2 is electrically connected to the positive terminal of the lithium battery 100, the other end of the second resistor R2 is respectively electrically connected to one end of the third resistor R3 and the input end of the control module 500, and the other end of the third resistor R3 is grounded. The first capacitor C1 and the third resistor R3 are connected in parallel.

[0069] Among them, the second sampling circuit includes: a fourth resistor R4, a fifth resistor R5, and a second capacitor C2.

[0070] One end of the fourth resistor R4 is electrically connected to the negative terminal of the lithium battery 100, the other end of the fourth resistor R4 is respectively electrically connected to one end of the fifth resistor R5 and the input terminal of the control module 500, and the other end of the fifth resistor R5 is grounded. The second capacitor C2 is connected in parallel with the fifth resistor R5.

[0071] Referring to Figure 1 and Figure 2 , in some embodiments of the first aspect of the present invention, the output circuit 400 includes: a first resistor R1 and a first triode Q1.

[0072] One end of the first resistor R1 is electrically connected to the output terminal of the control module 500, the other end of the first resistor R1 is electrically connected to the base of the first triode Q1, the collector of the first triode Q1 is electrically connected to the positive terminal of the lithium battery 100, and the emitter of the first triode Q1 is electrically connected to an external auxiliary power supply.

[0073] In some embodiments of the second aspect of the present invention, a charging device includes the charging activation circuit of the lithium battery in the embodiments of the first aspect of the present invention.

[0074] In one embodiment, when the charging device supplies power to the lithium battery and the charging device is powered on, through the charging activation circuit of the lithium battery in the first aspect of the present invention, the charging device can temporarily not supply power to the lithium battery, and after the charging activation circuit activates the lithium battery, then charge and supply power to the lithium battery.

[0075] The preferred embodiments of the present invention have been specifically described above, but the present invention is not limited to the described embodiments. Those skilled in the art can also make various equivalent variations or substitutions without departing from the spirit of the present invention, and these equivalent variations or substitutions are all included within the scope defined by the claims of this application.

Claims

1. A charging activation circuit for a lithium battery, characterized in that: include: Lithium batteries; A power supply circuit, wherein the power supply circuit is connected to a lithium battery; A detection circuit, wherein an input end of the detection circuit is connected to the lithium battery, and the detection circuit is used to detect the current battery voltage of the lithium battery; An output circuit, wherein an output end of the output circuit is connected to a lithium battery, and the output circuit is used to receive an activation voltage and output the activation voltage to the lithium battery; A control module is connected to the output end of the detection circuit, the input end of the output circuit and the power supply circuit respectively. The control module receives the battery voltage and outputs the activation voltage to a pulse activation voltage.

2. A charging activation circuit for a lithium battery according to claim 1, characterized in that: Also includes: Control circuit; The output end of the control circuit is connected to the power supply circuit and the lithium battery respectively, and the input end of the control circuit is connected to the control module. The control circuit is used to receive the control signal output by the control module to control the on-off between the power supply circuit and the lithium battery.

3. A charging activation circuit for a lithium battery according to claim 2, characterized in that: The lithium battery is connected to a charging protection board, and the lithium battery is provided with a positive terminal and a negative terminal; The positive terminal of the lithium battery is respectively connected to the output end of the control circuit, the input end of the detection circuit and the output end of the output circuit through the charging protection board; The negative terminal of the lithium battery is connected to the input end of the detection circuit and the power supply circuit respectively through the charging protection board.

4. A charging activation circuit for a lithium battery according to claim 2, characterized in that: The control circuit comprises: an amplifier circuit, wherein an input end of the amplifier circuit is connected to the control module; A relay, wherein a driving end of the relay is connected to an output end of the amplifier circuit, a normally closed end of the relay is connected to a power supply circuit, and a normally open end of the relay is suspended; A fuse is connected to the common terminal of the relay and the lithium battery respectively.

5. A charging activation circuit for a lithium battery according to claim 3, characterized in that: The detection circuit comprises: A first sampling circuit, wherein an input end of the first sampling circuit is connected to a positive terminal of a lithium battery, and an output end of the first sampling circuit is connected to a control module; A second sampling circuit, wherein the input end of the second sampling circuit is connected to the negative terminal of the lithium battery, and the output end of the second sampling circuit is connected to the control module.

6. A charging activation circuit for a lithium battery according to claim 1, characterized in that: The output circuit comprises: A first resistor, one end of which is connected to the control module; A first transistor, wherein the base of the first transistor is connected to the other end of the first resistor, the emitter of the first transistor is connected to the external auxiliary power supply, and the collector of the first transistor is connected to the lithium battery.

7. A charging activation circuit for a lithium battery according to claim 4, characterized in that: The control circuit further includes: a freewheeling diode; The anode of the freewheeling diode is connected to the driving end of the relay and the output end of the amplifier circuit respectively, and the cathode of the freewheeling diode is connected to the driving end of the relay.

8. A charging activation circuit for a lithium battery according to claim 1, characterized in that: The control module is a single chip microcomputer control module.

9. A charging activation circuit for a lithium battery according to claim 1, characterized in that: The activation voltage is a set of pulse voltages with a duration of 2 seconds.

10. A charging device, characterized in that: A charging activation circuit for a lithium battery comprising any one of claims 1 to 9.

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