CN219535665U - Rechargeable battery management circuit for wireless probes and wireless probe devices - Google Patents

Abstract

The utility model relates to a rechargeable battery management circuit for a wireless probe and wireless probe equipment, wherein a rechargeable battery module at least comprises a charging end and a rechargeable battery connected with a charging point end, a Bluetooth charging switch module is used for controlling the rechargeable battery to supply power to a Bluetooth chip, a control voltage supply module is used for dividing the charging voltage to obtain divided voltage, the difference between the divided voltage and the voltage on the positive electrode of the rechargeable battery is used as control voltage for controlling the on and off of the Bluetooth charging switch module, and as the divided voltage does not change along with the ambient temperature, when the charging voltage on the charging end rises along with the rising of the ambient temperature, the control voltage does not change along with the temperature, when the wireless probe is not arranged on a charging seat, the charging battery is controlled to supply power to the Bluetooth chip, and when the wireless probe is arranged on the charging seat to charge, the charging battery is controlled to supply power, the charging battery is disconnected from supplying power to the Bluetooth chip.

Description

Rechargeable battery management circuit for wireless probes and wireless probe devices

technical field

The present application relates to the field of household appliance accessories, in particular to a rechargeable battery management circuit for a wireless probe and a wireless probe device.

Background technique

Wireless probes are used to monitor food temperature. At present, all wireless probes on the market have a Bluetooth chip, which is used to transmit the temperature data monitored by the wireless probe to other devices. For example, when the wireless probe monitors the temperature of food in the oven, it can The chip transmits the monitored temperature data to the oven, and the oven automatically adjusts the heating temperature according to the monitored temperature data to better heat the food. Among them, the Bluetooth chip is powered by the rechargeable battery in the wireless probe. When the wireless probe is placed on the charging stand to charge the rechargeable battery, the wireless probe is not working, and the connection between the rechargeable battery and the Bluetooth chip needs to be disconnected. After the charging of the rechargeable battery is completed, the wireless probe leaves the charging stand and continues to restore the power supply of the rechargeable battery to the Bluetooth chip.

In summary, there is a need for a rechargeable battery management circuit for wireless probes, which can control the rechargeable battery to supply power to the Bluetooth chip when the wireless probe is not on the charging stand. While controlling the power supply to the rechargeable battery, disconnect the power supply of the rechargeable battery to the Bluetooth chip.

Utility model content

The present application provides a rechargeable battery management circuit for a wireless probe and a wireless probe device.

According to an aspect of the present application, an embodiment provides a charging battery management circuit for a wireless probe, including:

The rechargeable battery module at least includes a charging terminal and a rechargeable battery connected to the charging terminal. When the wireless probe is placed on the charging stand, the charging terminal is used to receive a charging voltage to charge the rechargeable battery Charging; when the wireless probe is not placed on the charging stand, the voltage on the charging terminal increases with the increase of the ambient temperature;

The Bluetooth charging switch module is connected between the positive pole of the rechargeable battery and the Bluetooth chip, and is used to control the rechargeable battery to supply power to the Bluetooth chip; wherein: when the wireless probe is placed on the charging stand, the The Bluetooth charging switch module is disconnected, so that the rechargeable battery is disconnected to supply power to the Bluetooth chip; when the wireless probe is not placed on the charging stand, the Bluetooth charging switch module is turned on, so that all The rechargeable battery supplies power to the bluetooth chip;

The control voltage supply module is connected to the control terminal of the Bluetooth charging switch module, and is used to obtain the voltage on the charging terminal, and divide the voltage on the charging terminal to obtain a divided voltage, and divide the divided voltage. The difference between the voltage and the voltage on the positive pole of the rechargeable battery is used as the control voltage, and the control voltage is used to control the turn-on and turn-off of the Bluetooth charging switch module; wherein, the voltage on the charging terminal is When changing with the ambient temperature, the control voltage does not change with the ambient temperature.

In an embodiment, the control voltage supply module includes: a first resistor, a second resistor and a thermistor;

One end of the first resistor is connected to the charging terminal, the other end of the first resistor is connected to the first end of the thermistor, the other end of the thermistor is connected to one end of the second resistor, and the second resistor The other end of the resistor is connected to the ground; the end of the first resistor connected to the thermistor is used to output the divided voltage.

In one embodiment, the resistance of the thermistor is negatively correlated with the ambient temperature.

In an embodiment, the rechargeable battery module further includes:

A Schottky diode, the anode of the Schottky diode is connected to the charging terminal, the cathode of the Schottky diode is connected to the positive pole of the rechargeable battery, and the negative pole of the rechargeable battery is connected to the ground.

In one embodiment, the Bluetooth charging switch module includes:

A switch tube, the switch tube includes a first pole, a second pole and a control pole, the first pole is connected to the positive pole of the rechargeable battery, the second pole is connected to the power supply terminal of the Bluetooth chip, and the control pole Used to obtain the divided voltage.

In one embodiment, the difference between the voltage on the first pole of the switch tube and the voltage on the control pole of the switch tube is used as the control voltage, and the minimum absolute value of the control voltage is

Among them, R1 is the resistance value of the first resistor, R2 is the resistance value of the second resistor, RT(T1) is the resistance value of the thermistor when the ambient temperature is T1, and Vcharge is when the wireless probe is not placed on the charging stand The voltage value on the charging terminal in the case of above.

In one embodiment, the difference between the voltage on the first pole of the switch tube and the voltage on the control pole of the switch tube is used as the control voltage, and the maximum absolute value of the control voltage is

Wherein, Vcc is the voltage on the positive pole of the rechargeable battery, Vd is the conduction voltage drop of the Schottky diode, R1 is the resistance value of the first resistor, R2 is the resistance value of the second resistor, and RT (T0) is the ambient temperature is the resistance value of the thermistor at T0.

In one embodiment, the switch transistor is a P-type MOS transistor.

In one embodiment, the charging stand includes:

A positive charging port and a negative charging port, the positive charging port is connected to the charging terminal, and the negative charging port is connected to the negative pole of the rechargeable battery.

According to one aspect of the present application, a wireless probe device is provided in an embodiment, including:

A wireless probe, including a bluetooth chip and the rechargeable battery management circuit described in any one of the above-mentioned embodiments;

charging stand; of which:

When the wireless probe is not placed on the charging stand, the rechargeable battery management circuit is used to control the power supply to the Bluetooth chip; when the wireless probe is placed on the charging stand, the The rechargeable battery management circuit is used for controlling charging of the rechargeable battery and disconnecting the power supply of the Bluetooth chip.

The rechargeable battery management circuit and wireless probe device for wireless probes according to the above-mentioned embodiments include a rechargeable battery module, a Bluetooth charging switch module and a control voltage supply module, and the rechargeable battery module at least includes a charging terminal and a charging terminal connected to For rechargeable batteries, the charging voltage on the charging terminal is positively correlated with the ambient temperature. The Bluetooth charging switch module is used to control the rechargeable battery to supply power to the Bluetooth chip. The control voltage supply module is used to divide the charging voltage to obtain the divided voltage. The difference between the divided voltage and the voltage on the positive pole of the rechargeable battery is used as the control voltage for controlling the turn-on and turn-off of the Bluetooth charging switch module. Since the divided voltage does not change with the ambient temperature, the charging voltage on the charging terminal varies with the environment. When the temperature rises, the control voltage does not change with the temperature. When the wireless probe is not on the charging stand, the rechargeable battery is controlled to supply power to the Bluetooth chip. When the wireless probe is placed on the charging stand for charging, the charging is controlled. While the battery is supplying power, disconnect the power supply of the rechargeable battery to the Bluetooth chip.

Description of drawings

Figure 1 is a schematic diagram of an example of a rechargeable battery management circuit in a wireless probe;

2 is a schematic structural diagram of a rechargeable battery management circuit for a wireless probe according to an embodiment of the present application;

3 is a schematic circuit diagram of a rechargeable battery management circuit for a wireless probe according to an embodiment of the present application;

4 is a schematic diagram of a simulation circuit for a rechargeable battery management circuit of a wireless probe;

Fig. 5 is a schematic diagram of simulation of the power supply voltage of the Bluetooth chip when the wireless probe of an embodiment is not on the charging stand;

Fig. 6 is a simulation schematic diagram of the power supply voltage of the Bluetooth chip when the wireless probe of another embodiment is not on the charging stand;

Fig. 7 is a simulation schematic diagram of the power supply voltage of the Bluetooth chip when the wireless probe of another embodiment is not on the charging stand;

Fig. 8 is a schematic diagram of simulation of the power supply voltage of the Bluetooth chip when the wireless probe of an embodiment is on the charging stand;

Fig. 9 is a simulation schematic diagram of the power supply voltage of the Bluetooth chip when the wireless probe of another embodiment is on the charging stand;

Fig. 10 is a simulation schematic diagram of the power supply voltage of the Bluetooth chip when the wireless probe of another embodiment is on the charging stand;

FIG. 11 is a schematic structural diagram of a wireless probe device provided in the embodiment of the present application.

Detailed ways

The present application will be described in further detail below through specific embodiments in conjunction with the accompanying drawings. Wherein, similar elements in different implementations adopt associated similar element numbers. In the following implementation manners, many details are described for better understanding of the present application. However, those skilled in the art can readily recognize that some of the features can be omitted in different situations, or can be replaced by other elements, materials, and methods. In some cases, some operations related to the application are not shown or described in the description, this is to avoid the core part of the application being overwhelmed by too many descriptions, and for those skilled in the art, it is necessary to describe these operations in detail Relevant operations are not necessary, and they can fully understand the relevant operations according to the description in the specification and general technical knowledge in the field.

In addition, the characteristics, operations or characteristics described in the specification can be combined in any appropriate manner to form various implementations, and the operation steps involved in each embodiment can also be exchanged or adjusted in the order that is obvious to those skilled in the art. . Therefore, the specification and drawings are only for clearly describing a certain embodiment, and do not imply a necessary composition and/or sequence.

The serial numbers assigned to components in this document, such as "first", "second", etc., are only used to distinguish the described objects, and do not have any sequence or technical meaning. The "connection" and "connection" mentioned in this application all include direct and indirect connection (connection) unless otherwise specified.

The wireless probe is used to monitor the temperature of food. The wireless probe has a rechargeable battery and a Bluetooth chip. The rechargeable battery is used to power the wireless probe and the Bluetooth chip. After monitoring the temperature of the food, it can be transmitted to other devices through the Bluetooth chip. For example, the food temperature can be transmitted to the steam oven through the Bluetooth chip, and the steam oven automatically adjusts the heating temperature of the device according to the transmitted food temperature. When the rechargeable battery needs to be charged, the wireless probe needs to be placed on the charging stand to charge the rechargeable battery. At this time, the power supply of the wireless probe to the Bluetooth chip is disconnected. When the wireless probe leaves After the charging stand starts working, the rechargeable battery in the wireless probe supplies power to the Bluetooth chip.

Please refer to Figure 1, Figure 1 is an example of the rechargeable battery management circuit in the wireless probe, hereinafter referred to as the rechargeable battery management circuit, the charging port + and the charging port - are the charging ports on the charging stand, and the Bluetooth chip is the The Bluetooth chip in the needle, the rechargeable battery management circuit includes Schottky diode D1, rechargeable battery Bat, charging terminal A, first resistor R1, second resistor R2 and PMOS tube Q1, charging terminal A and the anode of Schottky diode D1 connection, the cathode of the Schottky diode D1 is connected to the positive pole of the rechargeable battery Bat, the negative pole of the rechargeable battery Bat is connected to the ground, the positive pole of the rechargeable battery Bat is also connected to the S pole of the PMOS transistor Q1, and the G pole of the PMOS transistor Q1 passes through the second resistor R2 is connected to the ground, the G pole is also connected to the charging terminal A through the first resistor R1, and the D pole of the PMOS tube Q1 is connected to the Bluetooth chip; when the wireless probe is placed on the charging stand, the charging port + is connected to the charging terminal A, and the charging port -Connect to the negative pole of the rechargeable battery Bat. When the wireless probe is not placed on the charging stand, there is no voltage on the charging terminal A. At this time, the voltage difference between the G pole and the S pole of the PMOS transistor Q1 is greater than the conduction voltage Vgth of the PMOS transistor Q1, and Q1 is turned on. At this time, the voltage VCC output by the positive pole of the rechargeable battery Bat is directly loaded to the Vdd pin of the Bluetooth chip, and the Bluetooth chip realizes power supply. When the wireless probe is placed on the charging stand, the charging stand charges the rechargeable battery Bat of the wireless probe. At this time, the voltage Vcharge on the charging terminal A is the charging voltage. Due to the access of the charging voltage Vcharge, the G pole of the PMOS transistor Q1 The voltage difference between the pole and the S pole is less than the conduction voltage Vgth of the PMOS transistor Q1, Q1 is turned off, and at this time, the Bluetooth chip is disconnected from the power supply.

For the above battery management circuit, due to the large reverse leakage current of the Schottky diode D1, and the reverse leakage current increases exponentially with the increase of the ambient temperature, in addition, due to the requirement of standby, the first resistor R1 and the second resistor The resistance values of the two resistors R2 are both large, so in the case of high ambient temperature, the reverse leakage current of the Schottky diode D1 may make the voltage Vcharge on the charging terminal A almost equal to the voltage Vcc output by the positive pole of the rechargeable battery Bat , causing the PMOS tube Q1 to be turned off, causing the Bluetooth chip to be powered off when it should be powered, that is, during the use of the wireless probe, due to the high ambient temperature, the Bluetooth chip will be powered off. For the above problems, it can be solved by choosing a Schottky diode with a small reverse leakage current. However, a Schottky diode with a small reverse leakage current will have a small conduction current, which will directly affect the performance of the wireless probe. charging speed.

In the embodiment of this application, a thermistor is added to the rechargeable battery management circuit shown in Figure 1 to compensate for the gap between the G pole and the S pole of the PMOS transistor Q1 caused by the increase of the voltage Vcharge on the charging terminal A at high temperature. The reduced voltage difference makes the voltage difference between the G pole and S pole of the PMOS transistor Q1 unchanged when the voltage Vcharge on the charging terminal A changes with the ambient temperature, which solves the problem of power-off of the Bluetooth chip under high temperature conditions. problem without affecting the charging speed of the wireless probe.

Please refer to FIG. 2. FIG. 2 is a rechargeable battery management circuit for a wireless probe according to an embodiment of the present application, hereinafter referred to as the rechargeable battery management circuit. The rechargeable battery management circuit includes: a rechargeable battery module 11, a Bluetooth charging switch module 12 and Control voltage supply module 13.

As shown in Figure 3, the rechargeable battery module 11 includes a Schottky diode D1, a charging terminal A and a rechargeable battery Bat, the charging terminal A is connected to the anode of the Schottky diode D1, and the cathode of the Schottky diode D1 is connected to the rechargeable battery Bat. The positive pole is connected, and the negative pole of the rechargeable battery Bat is connected to the ground. When the wireless probe is placed on the charging stand, the charging terminal A is used to receive the charging voltage, and the voltage Vcharge on the charging terminal A at this time is the charging voltage; when the wireless probe is not placed on the charging stand, in the environment When the temperature is low, due to the small reverse leakage current of the Schottky diode D1, the voltage Vcharge on the charging terminal A should be basically 0. At this time, the Bluetooth chip in the wireless probe is normally powered. As the temperature rises, the reverse leakage current of the Schottky diode D1 increases, and at this time, the voltage Vcharge on the charging terminal A will increase as the temperature increases.

The Bluetooth charging switch module 12 is connected between the positive pole of the rechargeable battery Bat and the Bluetooth chip, and the Bluetooth charging control module 12 is used to control the rechargeable battery Bat to supply power to the Bluetooth chip. Wherein: when the wireless probe is placed on the charging stand, the Bluetooth charging switch module 12 is disconnected, so that the rechargeable battery is disconnected to supply power to the Bluetooth chip; when the wireless probe is not placed on the charging stand, the Bluetooth charging The switch module is turned on so that the rechargeable battery supplies power to the bluetooth chip.

The control voltage supply module 13 is connected to the control terminal of the Bluetooth charging switch module 12, and is used to obtain the voltage Vcharge on the charging terminal, and divide the voltage Vcharge on the charging terminal to obtain the divided voltage Vg, and divide the divided voltage Vg and The difference between the voltage Vcc on the positive pole of the rechargeable battery Bat is used as the control voltage Vgs, and the control voltage Vgs is used to control the on and off of the Bluetooth charging switch module 12; wherein, when the voltage Vcharge on the charging terminal changes with the ambient temperature , the control voltage Vgs does not change with the ambient temperature.

In some embodiments, the Bluetooth charging control module 12 includes a switch tube, the switch tube has a first pole, a second pole and a control pole, the first pole is connected to the positive pole of the rechargeable battery Bat, the second pole is connected to the power supply end of the Bluetooth chip, and the control Pole is used to obtain the divided voltage Vg. In one embodiment, the switch transistor can be a P-type MOS transistor, that is, PMOS transistor Q1, whose S is the first pole, G is the control pole, and D is the second pole. The control voltage is the voltage difference Vgs between Vg and Vcc. In other embodiments, the switch tube may also be other types of MOS tubes or transistors, which will not be repeated here.

In some embodiments, the control voltage supply module 13 includes: a first resistor R1, a second resistor R2, and a thermistor RT; one end of the first resistor R1 is connected to the charging terminal A, and the other end of the first resistor R1 is connected to the thermistor The first end of RT, the other end of the thermistor RT is connected to one end of the second resistor R2, and the other end of the second resistor R2 is connected to the ground; the end of the first resistor R1 connected to the thermistor RT is used to output the divided voltage Vg . Wherein, the resistance value of the thermistor RT is negatively correlated with the ambient temperature, that is, the higher the ambient temperature is, the smaller the resistance value of the thermistor RT is. In this way, after the ambient temperature rises, the voltage Vcharge on the charging terminal A increases. If the heating resistor RT is not used, the divided voltage Vg also increases with the increase of Vcharge. In this embodiment, the thermistor RT is added. , as the ambient temperature rises, the resistance of the thermistor RT becomes smaller, so the divided voltage Vg can remain almost unchanged.

In this embodiment, when dividing the voltage Vcharge on the charging terminal A, a thermistor RT is added to compensate for the increase in the divided voltage Vg caused by the increase in the voltage Vcharge on the charging terminal A, so that when charging When the voltage Vcharge on the terminal A increases with the increase of the ambient temperature, the divided voltage Vg can remain unchanged, so that the control voltage Vgs remains unchanged, and the Bluetooth charging control module 12 remains on, so that the Bluetooth chip is not powered off .

In some embodiments, the minimum turn-on voltage of the PMOS transistor Q1 needs to satisfy the following expression:

Among them, Vgth_min is the minimum value of the turn-on voltage of Q1, R1 is the resistance value of the first resistor, R2 is the resistance value of the second resistor, RT(T1) is the resistance value of the thermistor when the ambient temperature is T1, and Vcharge is The voltage value on the charging terminal when the wireless probe is not placed on the charging stand, this voltage is the voltage formed by the reverse leakage current of the Schottky diode D1, the higher the ambient temperature, the greater the Vcharge.

According to the above-mentioned minimum conduction voltage of the PMOS transistor Q1, the minimum absolute value of the control voltage is

In some embodiments, in order to disconnect the power supply of the Bluetooth chip when the wireless probe is placed on the charging stand, the maximum turn-on voltage of the PMOS transistor Q1 also needs to satisfy the following expression:

Among them, Vgth_max is the maximum conduction voltage of PMOS transistor Q1, Vcc is the voltage on the positive electrode of the rechargeable battery Bat, Vd is the conduction voltage drop of Schottky diode D1, R1 is the resistance value of the first resistor, and R2 is the second resistor The resistance value, RT(T0) is the resistance value of the thermistor when the ambient temperature is T0.

According to the above-mentioned maximum conduction voltage of the PMOS transistor Q1, the maximum value of the absolute value of the control voltage is

Please refer to Figure 4. Figure 4 is a schematic diagram of a simulation circuit for a rechargeable battery management circuit for a wireless probe. In this simulation experiment, R11=10KΩ, R12=51KΩ, R13=100KΩ, and the model of the thermistor is NCP03WF104F05RL (100kΩ Resistance accuracy: ±1% 4250K), which is formed by connecting two thermistors RT1 and RT2 in series, the model of PMOS transistor Q1 is RZM002P02T2L, the model of Schottky diode D1 is RB520G-30, and the model of rechargeable battery Bat is 3mAH, 2.4V (full 2.7V, discharge cut-off voltage 1.7V), the equivalent power consumption of the Bluetooth chip is 30KΩ, the simulation verification is carried out according to the above parameters, and the simulation results are as follows:

The minimum power of the rechargeable battery Bat is 1.7V, and the Vdd power supply situation when the ambient temperature is -20°C, -10°C, 0°C, 25°C, 50°C, 75°C, and 105°C, and the wireless probe is not on the charging stand, as shown in the figure As shown in 5, the simulation results show that the Bluetooth chip can be powered normally to meet the requirements.

The rated voltage of the rechargeable battery Bat is 2.4V. At the ambient temperature of -20°C, -10°C, 0°C, 25°C, 50°C, 75°C, and 105°C, the Vdd power supply situation when the wireless probe is not on the charging stand, as shown in Figure 6 As shown, the simulation results show that the Bluetooth chip can be powered normally to meet the requirements.

The full voltage of the rechargeable battery Bat is 2.7V, and the Vdd power supply situation when the wireless probe is not on the charging stand at the ambient temperature of -20°C, -10°C, 0°C, 25°C, 50°C, 75°C, and 105°C, as shown in the figure As shown in Figure 7, the simulation results show that the Bluetooth chip can be powered normally to meet the requirements.

The wireless probe is on the charging stand, the Bat power of the rechargeable battery is at least 1.7V, and the ambient temperature is -20°C, -10°C, 0°C, 25°C, 50°C, 75°C, 105°C, and the Vdd power supply is as shown in Figure 8 As shown, the simulation results show that the Bluetooth chip is disconnected from the power supply, which meets the requirements.

The wireless probe is on the charging stand, the rated voltage of the rechargeable battery Bat is 2.4V, and the ambient temperature is -20°C, -10°C, 0°C, 25°C, 50°C, 75°C, 105°C, and the Vdd power supply is as shown in Figure 9 As shown, the simulation results show that the Bluetooth chip is disconnected from the power supply, which meets the requirements.

The wireless probe is on the charging stand, the battery is fully charged with a voltage of 2.7V, and the ambient temperature is -20°C, -10°C, 0°C, 25°C, 50°C, 75°C, 105°C, and the Vdd power supply is shown in Figure 10 , the simulation results show that the Bluetooth chip is disconnected from the power supply, which meets the requirements.

Through the above simulation verification, it can be seen that the rechargeable battery management circuit for wireless probes provided by the embodiment of the present application can realize the selection of Schottky diodes with a large reverse leakage current of about 50uA (100°C), thereby achieving a faster charging speed (100mA), the charging speed is greatly improved.

Please refer to FIG. 11 , the embodiment of the present application also provides a wireless probe device, the wireless probe device includes a wireless probe 100 and a charging stand 200, the wireless probe 100 includes a Bluetooth chip 101 and a rechargeable battery management circuit 102, and the charging stand 200 includes a positive charging port 201 and a negative charging port 202, the positive charging port 201 is connected to the charging terminal, and the negative charging port 202 is connected to the negative pole of the rechargeable battery Bat. Wherein, the rechargeable battery management circuit is any one of the charging management circuits provided in the above-mentioned embodiments, and its specific implementation has been described in detail in the above-mentioned embodiments, and will not be repeated here.

The above uses specific examples to illustrate the utility model, which is only used to help understand the utility model, and is not intended to limit the utility model. For those skilled in the technical field to which the utility model belongs, some simple deduction, deformation or replacement can also be made according to the idea of the utility model.

Claims (10)

1. A rechargeable battery management circuit for a wireless probe, comprising:

the charging battery module at least comprises a charging end and a charging battery connected with the charging end, and the charging end is used for receiving charging voltage so as to charge the charging battery under the condition that the wireless probe is placed on the charging seat; in the case where the wireless probe is not placed on a charging dock, the magnitude of the voltage on the charging terminal increases with an increase in ambient temperature;

the Bluetooth charging switch module is connected between the positive electrode of the rechargeable battery and the Bluetooth chip and used for controlling the rechargeable battery to supply power to the Bluetooth chip; wherein: under the condition that the wireless probe is placed on the charging seat, the Bluetooth charging switch module is disconnected, so that the rechargeable battery is disconnected to supply power to the Bluetooth chip; under the condition that the wireless probe is not placed on the charging seat, the Bluetooth charging switch module is conducted so that the rechargeable battery supplies power to the Bluetooth chip;

the control voltage supply module is connected to the control end of the Bluetooth charging switch module and is used for obtaining the voltage at the charging end, dividing the voltage at the charging end to obtain divided voltage, and taking the difference between the divided voltage and the voltage at the positive electrode of the rechargeable battery as control voltage which is used for controlling the on and off of the Bluetooth charging switch module; wherein, when the voltage at the charging end changes along with the ambient temperature, the control voltage does not change along with the ambient temperature.

2. The rechargeable battery management circuit of claim 1 wherein said control voltage providing module comprises: a first resistor, a second resistor and a thermistor;

one end of the first resistor is connected with the charging end, the other end of the first resistor is connected with the first end of the thermistor, the other end of the thermistor is connected with one end of the second resistor, and the other end of the second resistor is connected with the ground; and one end of the first resistor, which is connected with the thermistor, is used for outputting the divided voltage.

3. The rechargeable battery management circuit of claim 2 wherein the resistance of said thermistor is inversely related to ambient temperature.

4. The rechargeable battery management circuit of claim 2 wherein said rechargeable battery module further comprises:

the anode of the Schottky diode is connected with the charging end, the cathode of the Schottky diode is connected with the anode of the rechargeable battery, and the cathode of the rechargeable battery is connected with the ground.

5. The rechargeable battery management circuit of claim 4, wherein said bluetooth charging switch module comprises:

the switching tube comprises a first pole, a second pole and a control pole, wherein the first pole is connected with the positive pole of the rechargeable battery, the second pole is connected with the power supply end of the Bluetooth chip, and the control pole is used for obtaining the divided voltage.

6. The rechargeable battery management circuit of claim 5, wherein a difference between a voltage on a first pole of said switching tube and a voltage on a control pole of said switching tube is used as said control voltage, and an absolute value of said control voltage has a minimum value of

Wherein, R1 is the resistance of the first resistor, R2 is the resistance of the second resistor, RT (T1) is the resistance of the thermistor when the ambient temperature is T1, and Vcharge is the voltage value at the charging end under the condition that the wireless probe is not placed on the charging seat.

7. The rechargeable battery management circuit of claim 5, wherein a difference between a voltage on a first pole of said switching tube and a voltage on a control pole of said switching tube is used as said control voltage, and an absolute value of said control voltage has a maximum value of

Wherein Vcc is the voltage on the positive electrode of the rechargeable battery, vd is the on-voltage drop of the schottky diode, R1 is the resistance of the first resistor, R2 is the resistance of the second resistor, and RT (T0) is the resistance of the thermistor when the ambient temperature is T0.

8. The rechargeable battery management circuit of claim 5 wherein said switching tube is a P-type MOS tube.

9. The rechargeable battery management circuit of any one of claims 1 to 8, wherein said charging dock comprises:

the positive charging port is connected with the charging end, and the negative charging port is connected with the negative electrode of the rechargeable battery.

10. A wireless probe apparatus, comprising:

a wireless probe comprising a bluetooth chip and a rechargeable battery management circuit according to any one of claims 1 to 9;

a charging stand; wherein:

the rechargeable battery management circuit is used for controlling the Bluetooth chip to be powered under the condition that the wireless probe is not placed on the charging seat; and under the condition that the wireless probe is placed on the charging seat, the rechargeable battery management circuit is used for controlling the rechargeable battery to be charged and disconnecting the power supply of the Bluetooth chip.