WO2015013942A1

WO2015013942A1 - Electric quantity inquiring device and method

Info

Publication number: WO2015013942A1
Application number: PCT/CN2013/080599
Authority: WO
Inventors: 向智勇
Original assignee: 瑞吉高新科技股份有限公司
Priority date: 2013-08-01
Filing date: 2013-08-01
Publication date: 2015-02-05

Abstract

An electric quantity inquiring device and method for inquiring the electric quantity of a battery pole of an electronic cigarette which can be used for many times. The electric quantity inquiring device comprises a standby battery (100), a current sampling unit (500), a voltage sampling unit (400), a charging control unit (300), a master control unit (200) and an electric quantity display unit (600). The master control unit (200) is used to cause the master control unit (200) to adjust and output a voltage provided by the standby battery (100) according to a charging current acquired by the current sampling unit (500) to make the charging current equals to a preset current, and then calculate the electric quantity of the battery according to a charging voltage acquired by the voltage sampling unit (400) at this time, and finally control the electric quantity display unit (600) to display the electric quantity. According to the present invention, the electric quantity of the battery pole can be displayed only by inserting or screwing the battery pole into the inquiring device for a short time to cause the battery pole to be charge with a preset current, so users can conveniently inquire the electric quantity of the battery pole.

Description

Electricity inquiry device and method

Technical field

The present invention relates to the field of electronic cigarettes, and in particular to a power inquiry device and method for inquiring the power of an electronic cigarette battery.

Background technique

The electronic cigarette includes a battery rod and an atomizer, and the battery rod is used to supply power to the atomizer of the electronic cigarette. Electronic cigarettes are divided into disposable electronic cigarettes and non-disposable electronic cigarettes. For disposable electronic cigarettes, the battery rod cannot be charged. For non-disposable electronic cigarettes, the battery rod can be charged.

The charging of the battery rod in the prior art includes an electronic cigarette case and a USB charger. Currently, the USB charger or the electronic cigarette case of most electronic cigarette battery rods on the market only have the "charging" and "full" indicated by the LED light. "The status indication, and some even have no indicators.

Since the two electrodes exposed by the battery rod are connected to the two poles of the heating wire, and are not connected to the two poles of the battery, the battery voltage and the electric quantity cannot be directly measured. Many times, the user does not know how much electricity the battery rod is charged or how much battery capacity is left. In order to ensure that there is enough power during use, regardless of whether the battery rod has power or not, charging first, on the one hand, shortening the life of the battery rod, another The aspect also causes inconvenience to the user.

Therefore, there is a defect in the prior art for the acquisition of the power of the battery rod, which needs improvement.

Summary of the invention

The technical problem to be solved by the present invention is to provide a power inquiry device and method for the defect that the above-mentioned battery rod of the prior art is inconvenient to obtain.

The technical solution adopted by the present invention to solve the technical problem is: constructing a power inquiry device for inquiring the battery power in the electronic cigarette battery rod, including

Backup battery, current sampling unit, voltage sampling unit, charging control unit, main control unit and power display unit;

The main control unit is respectively connected to the backup battery, the current sampling unit, the voltage sampling unit, the charging control unit and the power display unit; the current sampling unit, the voltage sampling unit and the charging control unit are also connected to the battery rod Connected; the charging control unit and the power display unit are also connected to the backup battery;

The backup battery unit is configured to supply a power voltage to the main control unit, the charging control unit, and the power display unit;

The current sampling unit is configured to collect a charging current of the battery rod, and send the collected charging current signal to the main control unit;

The main control unit is configured to output a charging control signal to the charging control unit according to the charging current signal;

The charging control unit is configured to adjust a charging voltage of a current charging state according to the charging control signal, so that a charging current of the battery rod is equal to a preset current;

The voltage sampling unit is configured to collect the adjusted charging voltage of the battery rod, and send the collected charging voltage signal to the main control unit.

The main control unit is further configured to calculate a quantity of the battery in the battery rod according to the charging voltage, and output a power quantity display signal to the power quantity display unit;

The power display unit is configured to display the power according to the received power display signal.

In the electric quantity inquiry device of the present invention, the backup battery unit includes a battery.

In the electric quantity inquiry device of the present invention, the battery is a replaceable battery.

In the electric quantity inquiry device according to the present invention, the battery is a rechargeable battery.

In the power inquiry device of the present invention, the backup battery unit further includes a USB interface unit and a charging management unit;

The USB interface unit, the charging management unit, the rechargeable battery, and the charging control unit are sequentially connected;

The charging management unit is configured to control the external power source to perform constant current charging on the rechargeable battery when an external power source is connected.

In the power inquiry device of the present invention, the charge management unit includes a charge management chip, and the charge management chip model is VA7204.

In the power inquiry device of the present invention, the main control unit includes a microprocessor, and the model of the microprocessor is SN8P2712.

In the power inquiry device of the present invention, the battery rod includes a positive output terminal and a negative output terminal;

The charging control unit includes a MOS transistor, a boosting chip, a triode, an inductor, and a diode; the boosting chip is of a type CP2121;

The pin 4 of the boosting chip is connected to the microprocessor, and the pin 4 of the boosting chip is also connected to the base of the transistor through a first resistor, and the base of the transistor is also passed a second resistor is grounded, an emitter of the transistor is grounded, a collector of the transistor is connected to a source of the MOS transistor through a third resistor, and a collector of the transistor is further connected to a gate of the MOS transistor a source of the MOS transistor is configured to receive a voltage provided by the backup battery unit, a drain of the MOS transistor is connected to an anode of the diode through the inductor, and a pin 5 of the boosting chip is connected to Between the MOS transistor and the inductor, pin 1 of the boost chip is connected between the diode and the inductor, and a cathode of the diode is connected to the positive output.

In the electric quantity inquiry device of the present invention, the voltage sampling unit includes a first voltage dividing resistor and a second voltage dividing resistor, one end of the first voltage dividing resistor is connected to the positive output end, and the first partial voltage is The other end of the resistor is connected to one end of the second voltage dividing resistor, the other end of the second voltage dividing resistor is grounded, and the first voltage dividing resistor and the second voltage dividing resistor are connected to the microprocessor .

In the power inquiry device of the present invention, the current sampling unit 500 includes a current sampling resistor and a fourth resistor;

One end of the current sampling resistor is connected to one end of the fourth resistor and the negative output end, the other end of the current sampling resistor is grounded, and the other end of the fourth resistor is connected to the microprocessor.

In the electric quantity inquiry device of the present invention, the electric quantity display unit includes an LED lamp and/or an LED screen and/or an LCD screen.

The invention also discloses a power inquiry method for querying the electric quantity of the electronic cigarette battery in the battery rod, In the charged state, the method includes the following steps:

S1, the current sampling unit collects the charging current of the battery rod, and sends the collected charging current signal to the main control unit;

S2, the main control unit outputs a charging control signal according to the charging current signal, and the charging control signal is sent to the charging control unit;

S3. The charging control unit adjusts the charging voltage of the current charging state according to the charging control signal, so that the charging current is equal to the preset current;

S4. The voltage sampling unit collects the adjusted charging voltage of the battery rod, and sends the collected charging voltage signal to the main control unit.

S5. The main control unit calculates a quantity of the battery in the battery rod according to the charging voltage, and outputs a power quantity display signal to the power quantity display unit;

S6. The power display unit displays the power according to the received power display signal.

In the power query method of the present invention, the step S5 includes the following processing:

S51. Calculate a battery voltage according to the charging voltage, and calculate a formula as follows:

Ubat=U charging-U1-U2;

Where Ubat represents the voltage of the battery in the battery rod, U charge represents the charging voltage; U1 represents the internal pressure drop of the battery rod; U2 represents the voltage drop of the current sampling resistor;

S52. Calculate the amount of power of the battery in the battery rod according to the voltage Ubat.

The power inquiry apparatus and method of the present invention have the following beneficial effects: the present invention utilizes a charging management unit to charge a battery, and simultaneously collects a charging current by using a current sampling unit, and the main control unit controls the charging control unit to adjust the charging voltage according to the charging current. In order to make the charging current reach the preset current, and when the charging current reaches the preset current, calculate the internal battery voltage of the battery rod according to the charging voltage collected by the voltage sampling unit at this time, and then calculate the battery power according to the battery voltage to control the power display. The unit displays the specific power information. Since the battery rod needs to be charged for a short adjustment process, the charging current of the battery rod reaches a preset current, and when the charging current of the battery rod is determined to reach the preset current, the collected charging voltage is obtained. There is a simple conversion process with the voltage of the battery in the battery rod, so the battery voltage can be calculated according to the charging voltage collected at this time, and then the battery power is calculated according to the battery voltage, and the battery power is displayed. In this way, the battery rod can be displayed by simply inserting or screwing the battery rod into the inquiry device for a short period of time to display the battery rod power, which greatly facilitates the user to inquire about the battery rod power.

DRAWINGS

The present invention will be further described below in conjunction with the accompanying drawings and embodiments, in which:

1 is a schematic structural view of a power inquiry apparatus of the present invention;

2 is a schematic structural diagram of a first embodiment of a power inquiry device according to the present invention;

3 is a circuit schematic diagram of a first embodiment of a power inquiry device according to the present invention;

4 is a schematic structural diagram of a second embodiment of a power inquiry device according to the present invention;

Figure 5 is a flow chart of the power inquiry method of the present invention;

Figure 6 is a flow chart of the first embodiment of the power inquiry method of the present invention.

detailed description

For a better understanding of the technical features, objects and effects of the present invention, the embodiments of the present invention are described in detail with reference to the accompanying drawings.

In order to solve the defect that the power consumption of the battery rod is inconvenient in the prior art, the present invention provides a power inquiry device and method that can be used for directly inquiring the battery rod power.

The invention utilizes the feature that the battery rod needs to be charged for a short adjustment process so that the battery rod is charged with a preset current, and the battery rod is charged, and when the charging current of the battery rod is determined to reach the preset current, the collected is collected. There is a simple conversion process between the charging voltage and the voltage of the battery rod, and the battery power is calculated according to the collected battery voltage, and the battery power is displayed, which can greatly facilitate the user to inquire about the battery rod power.

Referring to FIG. 1, it is a schematic structural diagram of a power inquiry apparatus of the present invention.

The invention is used for charging a battery rod. The battery rod has two types, one is a battery rod with a charging management circuit itself, and the other is a battery rod without a charging management circuit. The present invention can be used for the above two types of batteries. The pole performs a power check.

Specifically, the power inquiry apparatus of the present invention includes:

Backup battery 100, current sampling unit 500, voltage sampling unit 400, charging control unit 300, main control unit 200 and power display unit 600;

The main control unit 200 is respectively connected to the backup battery 100, the current sampling unit 500, the voltage sampling unit 400, the charging control unit 300, and the power display unit 600; the current sampling unit 500, the voltage sampling unit 400, and the charging control The unit 300 is also connected to the battery rod; the charging control unit 300 and the power display unit 600 are also connected to the backup battery 100;

The backup battery unit 100 is configured to provide a power voltage for the main control unit 200, the charging control unit 300, and the power display unit 600. The backup battery unit 100 includes a battery, and the battery may be a rechargeable battery or a replaceable battery;

The current sampling unit 500 is used to collect the charging current of the battery rod, and send the collected charging current signal to the main control unit 200;

The main control unit 200 is configured to output a charging control signal to the charging control unit 300 according to the charging current signal;

The charging control unit 300 is configured to adjust a charging voltage of a current charging state according to the charging control signal, so that a charging current of the battery rod is equal to a preset current;

The voltage sampling unit 400 is configured to collect the adjusted charging voltage of the battery rod, and send the collected charging voltage signal to the main control unit 200.

The main control unit 200 is further configured to calculate the power of the battery in the battery rod according to the charging voltage, and output a power quantity display signal to the power quantity display unit 600;

The power display unit 600 is configured to display the power according to the received power display signal.

For example, when the preset current is 60 mA, the charging current reaches the preset current only 0.5~10 s from the moment when the battery rod is inserted or screwed into the inquiry device. Once the charging current reaches the preset current, the charging voltage collected by the voltage sampling unit 400, that is, the newly adjusted charging voltage, has the following relationship with the voltage of the battery in the battery rod:

Ubat=U charging-U1-U2;

Among them, Ubat represents the voltage of the battery in the battery rod, U charge represents the latest adjusted charging voltage; U1 represents the internal voltage drop of the battery rod, and the internal voltage drop is related to the charging current, which is generally 0.2V at 120mA and 0.1V at 60mA. U2 represents the voltage drop of the current sampling resistor. In this embodiment, the resistance of the current sampling resistor is 2.2 Ω, that is, the voltage drop of the current sampling resistor is 2.2*60 mA, that is, 0.132 V, and the Ubat= U charge -0.232V.

The power display unit 600 is connected between the backup battery unit 100 and the main control unit 200 for displaying specific battery information of the battery in the battery rod under the control of the main control unit 200. The above-described power display unit 600 includes an LED light and/or an LED screen and/or an LCD screen. In this way, without disassembling the battery rod, the battery rod can be inserted into the finder to measure and display the battery rod's power. The display is intuitive, the user can clearly know the remaining battery capacity, and respond quickly, and only takes a short time. The battery rod can be displayed.

Moreover, since the real purpose of the inquiry device is not to charge the battery, but to charge the battery rod in a short time by means of the charging characteristic, the other functions of the circuit do not have to be considered, so the size is small and the carrying is convenient.

The conversion between voltage and power can be achieved by the general look-up table method, as shown in Table 1:

Table 1

Voltage (V) 3.0 3.5 3.6 3.70 3.75 3.80 3.85 3.9 4.0 4.1 4.2

Percentage of electricity (%) 0 5 10 20 40 60 70 80 85 90 100

Referring to FIG. 2, it is a schematic structural diagram of a first embodiment of a power inquiry apparatus according to the present invention.

In the first embodiment, the above battery in the backup battery unit 100 is a replaceable battery 80.

The above battery rod includes a positive output terminal OUT+ and a negative output terminal OUT-.

The charging control unit 300 includes a MOS transistor Q1, a boosting chip U1, a transistor Q2, an inductor L, a diode D, a first resistor R5, a second resistor R6, and a third resistor R7; the boosting chip U1 is of a type CP2121; The MOS transistor Q1 is of a P type, and the transistor Q2 is of an NPN type.

The pin 4 of the boosting chip U1 is connected to the microprocessor, and the pin 4 of the boosting chip U1 is also connected to the base of the transistor Q2 through a first resistor R5, the transistor Q2 The base of the transistor is also grounded through a second resistor R6, the emitter of the transistor Q2 is grounded, the collector of the transistor Q2 is connected to the source of the MOS transistor Q1 through a third resistor R7, and the collector of the transistor Q2 Also connected to the gate of the MOS transistor Q1, the source of the MOS transistor Q1 is for receiving the voltage Vbat provided by the backup battery rod, and the drain of the MOS transistor Q1 is connected to the The anode of the diode D, the pin 5 of the boosting chip U1 is connected between the MOS transistor Q1 and the inductor L, and the pin 1 of the boosting chip U1 is connected to the diode D and the inductor L. The cathode of the diode D is connected to the positive output terminal OUT+, and the cathode of the diode D is also grounded through a series branch of a resistor R8 and a resistor R9, and the capacitor C is connected in parallel with the resistor R8 and the resistor R9.

The microprocessor adjusts the charging voltage to change the duty ratio of the PWM wave output to the base of the transistor Q2, so that the turn-on and turn-off time of the transistor Q2 is changed, thereby controlling the turn-on and turn-off time of the MOS transistor Q1. Change, macro adjustment of the charging voltage is achieved.

The voltage sampling unit 400 includes a first voltage dividing resistor R1 and a second voltage dividing resistor R2. One end of the first voltage dividing resistor R1 is connected to the positive output terminal OUT+, and the other end of the first voltage dividing resistor R1 is connected to One end of the second voltage dividing resistor R2, the other end of the second voltage dividing resistor R2 is grounded, and the first voltage dividing resistor R1 and the second voltage dividing resistor R2 are connected to the microprocessor.

The current sampling unit 500 includes a current sampling resistor R3 and a fourth resistor R4;

One end of the current sampling resistor R3 is connected to one end of the fourth resistor R4 and the negative output terminal OUT-, the other end of the current sampling resistor R3 is grounded, and the other end of the fourth resistor R4 is connected to the micro processing Device.

The above-described electric quantity display unit 600 is preferably an LED lamp.

Referring to FIG. 4, it is a schematic structural diagram of a second embodiment of the power inquiry apparatus of the present invention.

In the second embodiment, the difference from the first embodiment is that the battery selection in the backup battery unit 100 is different, the battery in the backup battery unit 100 is the rechargeable battery 70, and the backup battery unit 100 further includes the USB interface unit 50 and charging. Management unit 60;

The USB interface unit 50, the charging management unit 60, the rechargeable battery 70, and the charging control unit 300 are sequentially connected;

The charging management unit 60 is configured to control the external power source to perform constant current charging on the rechargeable battery 70 when an external power source is connected.

The implementation of constant current charging is controlled by a charge management chip in the charge management unit 60, which is model number VA7204.

Referring to FIG. 5, it is a flowchart of the power inquiry method of the present invention.

The power query method of the present invention is used for querying the power of the electronic cigarette battery in the battery rod. Referring to the above query device, the method includes the following steps:

S1, the current sampling unit 500 collects the charging current of the battery rod, and sends the collected charging current signal to the main control unit 200;

S2, the main control unit 200 outputs a charging control signal according to the charging current signal, the charging control signal is sent to the charging control unit 300;

S3. The charging control unit 300 adjusts the charging voltage of the current charging state according to the charging control signal, so that the charging current is equal to the preset current;

S4. The voltage sampling unit 400 collects the adjusted charging voltage of the battery rod, and sends the collected charging voltage signal to the main control unit 200.

S5, the main control unit 200 calculates the battery power in the battery rod according to the charging voltage, and outputs a power display signal to the power display unit 600;

S6. The power display unit 600 displays the power according to the received power display signal. Includes LED light display and / or LED screen display and / or LCD screen display.

The step S5 includes the following processing:

Ubat=U charging-U1-U2;

Among them, Ubat represents the voltage of the battery in the battery rod, U charge represents the latest adjusted charging voltage; U1 represents the internal pressure drop of the battery rod, for the battery rod with the charging management circuit and the battery rod without the charging management circuit, the internal The other circuit will have a certain voltage drop. For a charging current of 60mA, the voltage drop is generally 0.1V; U2 represents the voltage drop of the current sampling resistor. For example, if the preset current is 60mA, if the resistance of the current sampling resistor is 2.2Ω, that is, the voltage drop of the current sampling resistor R3 is 2.2*60mA, that is, 0.132V, the Ubat= U charge -0.232V.

S52. Calculate the power of the battery in the battery rod according to the voltage Ubat. The conversion of the battery voltage and the battery power may be implemented by using a look-up table method.

Referring to Figure 6, there is shown a flow chart of a first embodiment of the power query method of the present invention.

In the specific implementation, before step S1, the method further includes:

S0. The backup battery unit outputs the lowest charging voltage to the battery rod through the charging control unit; for example, for the battery rod, the charging voltage is generally adjusted from 3.3V to 4.2V, when the battery rod is inserted into the finder, The charging voltage is set to 3.3V.

For the step S3, the charging current is equal to the preset current. Here, the charging current is continuously sampled. If the charging current is greater than the preset current, the charging voltage is appropriately controlled. If the charging current is less than the preset current, the control is performed. Appropriately raise the charging voltage, and then jump to step S1, continue to make the sampling judgment adjustment, and finally make the charging current equal to the preset current, and then sample the charging voltage at this time according to step S4.

The embodiments of the present invention have been described above with reference to the drawings, but the present invention is not limited to the specific embodiments described above, and the specific embodiments described above are merely illustrative and not restrictive, and those skilled in the art In the light of the present invention, many forms may be made without departing from the spirit and scope of the invention as claimed.

Claims

A power inquiry device for inquiring battery power in an electronic cigarette battery rod, characterized in that:

a backup battery (100), a current sampling unit (500), a voltage sampling unit (400), a charging control unit (300), a main control unit (200), and a power display unit (600);

The main control unit (200) is respectively connected to the backup battery (100), a current sampling unit (500), a voltage sampling unit (400), a charging control unit (300), and a power display unit (600); The current sampling unit (500), the voltage sampling unit (400), and the charging control unit (300) are also connected to the battery rod; the charging control unit (300) and the power display unit (600) are also connected to the backup battery (100) connected;

The backup battery unit (100) is configured to provide a power supply voltage for the main control unit (200), the charging control unit (300), and the power display unit (600);

The current sampling unit (500) is configured to collect the charging current of the battery rod, and send the collected charging current signal to the main control unit (200);

The main control unit (200) is configured to output a charging control signal to the charging control unit (300) according to the charging current signal;

The charging control unit (300) is configured to adjust a charging voltage of a current charging state according to the charging control signal, so that a charging current of the battery rod is equal to a preset current;

The voltage sampling unit (400) is configured to collect the adjusted charging voltage of the battery rod, and send the collected charging voltage signal to the main control unit (200);

The main control unit (200) is further configured to calculate a quantity of the battery in the battery rod according to the charging voltage, and output a power quantity display signal to the power quantity display unit (600);

The power display unit (600) is configured to display the power according to the received power display signal.
The electric quantity inquiry device according to claim 1, wherein the backup battery unit (100) comprises a battery.
The electric quantity inquiry device according to claim 2, wherein the battery is a replaceable battery (80).
The electric quantity inquiry device according to claim 2, wherein the battery is a rechargeable battery (70).
The power inquiry device according to claim 4, wherein the backup battery unit (100) further comprises a USB interface unit (50) and a charging management unit (60);

The USB interface unit (50), the charging management unit (60), the rechargeable battery (70), and the charging control unit (300) are sequentially connected;

The charging management unit (60) is configured to control the external power source to perform constant current charging on the rechargeable battery (70) when an external power source is connected.
The power inquiry device according to claim 5, wherein the charge management unit (60) comprises a charge management chip, and the charge management chip model is VA7204.
The power inquiry device according to claim 1, wherein said main control unit (200) comprises a microprocessor, and said microprocessor is of the type SN8P2712.
The electric quantity inquiry device according to claim 7, wherein the battery rod comprises a positive output terminal (OUT+) and a negative output terminal (OUT-);

The charging control unit (300) includes a MOS transistor (Q1), a boosting chip (U1), a triode (Q2), an inductor (L), a diode (D), a first resistor (R5), and a second resistor (R6). And a third resistor (R7); the boost chip (U1) is of the type CP2121;

The pin 4 of the boosting chip (U1) is connected to the microprocessor, and the pin 4 of the boosting chip (U1) is also connected to the transistor (Q2) through a first resistor (R5). The base of the transistor, the base of the transistor (Q2) is also grounded through a second resistor (R6), the emitter of the transistor (Q2) is grounded, and the collector of the transistor (Q2) passes through a third resistor (R7) Connected to the source of the MOS transistor (Q1), the collector of the transistor (Q2) is also connected to the gate of the MOS transistor (Q1), and the source of the MOS transistor (Q1) is used for receiving The voltage provided by the backup battery unit (100), the drain of the MOS transistor (Q1) is connected to the anode of the diode (D) through the inductor (L), and the boosting chip (U1) has No. 5 a pin is connected between the MOS transistor (Q1) and the inductor (L), and a pin 1 of the boosting chip (U1) is connected between the diode (D) and the inductor (L), The cathode of the diode (D) is connected to the positive output (OUT+).
The electric quantity inquiry device according to claim 7, wherein the voltage sampling unit (400) comprises a first voltage dividing resistor (R1) and a second voltage dividing resistor (R2), and the first voltage dividing resistor (R1) One end is connected to the positive output terminal (OUT+), the other end of the first voltage dividing resistor (R1) is connected to one end of the second voltage dividing resistor (R2), and the second voltage dividing resistor (R2) The other end is grounded, and the first voltage dividing resistor (R1) and the second voltage dividing resistor (R2) are connected to the microprocessor.
The power inquiry device according to claim 7, wherein the current sampling unit 500 comprises a current sampling resistor (R3) and a fourth resistor (R4);

One end of the current sampling resistor (R3) is connected to one end of the fourth resistor (R4) and the negative output terminal (OUT-), and the other end of the current sampling resistor (R3) is grounded, and the fourth resistor (R4) The other end is connected to the microprocessor.
The electric quantity inquiry device according to claim 7, characterized in that the electric quantity display unit (600) comprises an LED lamp and/or an LED screen and/or an LCD screen.
A power inquiry method for inquiring the power of an electronic cigarette battery in a battery rod, wherein In the charged state, the method includes the following steps:

S1, the current sampling unit (500) collects the charging current of the battery rod, and sends the collected charging current signal to the main control unit (200);

S2, the main control unit (200) outputs a charging control signal according to the charging current signal, the charging control signal is sent to the charging control unit (300);

S3. The charging control unit (300) adjusts the charging voltage of the current charging state according to the charging control signal, so that the charging current is equal to the preset current;

S4, the voltage sampling unit (400) collects the adjusted charging voltage of the battery rod, and sends the collected charging voltage signal to the main control unit (200);

S5, the main control unit (200) calculates the battery power in the battery rod according to the charging voltage, and outputs a power display signal to the power display unit (600);

S6. The power display unit (600) displays the power according to the received power display signal.
The power inquiry method according to claim 12, wherein the step S5 comprises the following processing:

S51. Calculate a battery voltage according to the charging voltage, and calculate a formula as follows:

Ubat=U charging-U1-U2;

Where Ubat represents the voltage of the battery in the battery rod, U charge represents the charging voltage; U1 represents the internal pressure drop of the battery rod; U2 represents the voltage drop of the current sampling resistor (R3);

S52. Calculate the amount of power of the battery in the battery rod according to the voltage Ubat.