Battery over-temperature protection system and self-moving device

Abstract

The utility model discloses a kind of battery over-temperature protection system and self-moving device, including battery management module, first controller and wireless charging device, battery management module, first controller are used to set in self-moving device, battery management module includes battery;The first communication end of first controller is electrically connected with the communication end of battery management module, obtains the temperature information of battery;The second communication end of first controller is connected with the communication end of wireless charging device, for outputting the temperature information of battery to wireless charging device, wireless charging device is used to control the charging current of battery according to temperature information.When battery is in over-temperature state, wireless charging device adjusts the size of charging current, ensure that the temperature of battery does not continue to rise, make battery be in stable working condition, guarantee the charging efficiency of battery, improve the experience effect of user.

Description

Technical Field

[0001] This utility model relates to the field of batteries, and in particular to a battery over-temperature protection system and a self-moving device. Background Technology

[0002] With the rapid development of technology, wireless charging technology has been applied in various aspects. When wireless charging technology is used in current self-mobile devices, the battery temperature will rise rapidly when the outdoor ambient temperature is too high or the sun shines directly on the battery. The self-mobile device will trigger the protection mechanism and directly cut off the charging circuit, affecting the charging efficiency of the self-mobile device battery; or the self-mobile device may not have a protection mechanism, which may lead to battery damage or cause an accident. Summary of the Invention

[0003] This utility model provides a battery over-temperature protection system and a self-moving device to solve the problem of poor charging efficiency of batteries in existing self-moving devices when the temperature is too high.

[0004] To achieve the above objectives, in one embodiment, a battery over-temperature protection system is provided, comprising: a battery management module, a first controller, and a wireless charging device; The battery management module and the first controller are installed in the self-moving device, and the battery management module includes a battery. The first communication terminal of the first controller is electrically connected to the communication terminal of the battery management module for acquiring battery temperature information; the second communication terminal of the first controller is connected to the communication terminal of the wireless charging device for outputting the battery temperature information to the wireless charging device, and the wireless charging device is used to control the charging current of the battery according to the battery temperature information.

[0005] In one embodiment, the device further includes a first wireless communication module, which is integrated into a first controller or set separately; the wireless charging device is provided with a second wireless communication module and a second controller, the self-moving device is used to send the temperature information to the second wireless communication module through the first wireless communication module, and the second controller is used to control the charging current of the battery according to the temperature information.

[0006] In one embodiment, the device further includes a wireless charging receiver module that provides a power supply signal to the battery. The wireless charging device is equipped with a wireless charging transmitter module, which is interconnected with the second controller. The wireless charging transmitter module is used to transmit electrical energy to the wireless charging receiver module via wireless transmission.

[0007] In one embodiment, the battery management module includes a third controller and a temperature sensing unit. The third controller is electrically connected to the output terminal of the temperature sensing unit and is used to acquire battery temperature information. The third controller is also connected to the first communication terminal of the first controller.

[0008] In one embodiment, the battery management module further includes a charging control module, wherein the input terminal of the charging control module is connected to the output terminal of the wireless charging receiver module, the output terminal is connected to the charging input terminal of the third controller, and the charging output terminal of the third controller is connected to the power supply terminal of the battery, for outputting a power supply signal to the battery.

[0009] In one embodiment, a switch is provided between the charging output terminal of the third controller and the power supply terminal of the battery to control whether the charging current enters the battery.

[0010] In one embodiment, the temperature sensing unit includes at least one thermistor connected to the third controller.

[0011] In one embodiment, the wireless charging transmitting module includes a transmitting coil, a power driving circuit, and a transmitting control chip connected in sequence to the output and input; the wireless charging receiving module includes a receiving coil, a resonant capacitor, a rectifier circuit, a receiving control chip, and a voltage regulator output circuit connected in sequence to the output and input; the receiving coil and the transmitting coil are used for magnetic field coupling to induce alternating current, and the receiving control chip is also connected to the transmitting control chip through a communication feedback channel.

[0012] In one embodiment, the wireless charging transmitter module further includes a foreign object detection unit and a temperature protection unit, both electrically connected to the transmitter control chip.

[0013] In one embodiment, a self-moving device is provided, which is equipped with the battery management module and the first controller in the above-mentioned battery over-temperature protection system.

[0014] The aforementioned battery over-temperature protection system and self-moving device include a self-moving device, a battery management module, and a wireless charging device. A first controller in the self-moving device obtains battery temperature information from the battery management module and transmits this information to the wireless charging device. When the first controller determines that the battery is in an over-temperature state, it controls the wireless charging device to adjust the charging current to ensure that the battery temperature does not continue to rise, thus maintaining a stable operating state. Compared to existing mechanisms that directly trigger battery charging failure or cause overheating due to continued charging, the battery over-temperature protection system of this application ensures battery charging efficiency and improves the user experience. Attached Figure Description

[0015] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments of this utility model will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a schematic diagram of a battery over-temperature protection system in one embodiment of this utility model; Figure 2 This is a schematic diagram of a battery over-temperature protection system in one embodiment of this utility model; Figure 3 This is a schematic diagram showing the connection between the wireless charging device and the wireless charging receiver module in one embodiment of this utility model. Figure 4 This is a schematic diagram of the battery management module in one embodiment of the present invention; Reference numerals: 1. Self-moving device; 11. First controller; 12. First wireless communication module; 13. Wireless charging receiver module; 2. Battery management module; 21. Battery; 22. Third controller; 23. Temperature sensing unit; 24. Charging control module; 25. Switch; 3. Wireless charging device; 31. Second wireless communication module; 32. Second controller; 33. Wireless charging transmitter module; L1. First communication terminal of first controller 11; L2. Second communication terminal of first controller 11; D1. Communication terminal of battery management module 2; D2. Communication terminal of wireless charging device 3. Detailed Implementation

[0017] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present utility model.

[0018] It should be understood that this invention can be embodied in various forms and should not be construed as being limited to the embodiments set forth herein. Rather, providing these embodiments will make the disclosure thorough and complete, and will fully convey the scope of this invention to those skilled in the art. In the drawings, for clarity, the dimensions of layers and regions, as well as their relative dimensions, may be exaggerated. The same reference numerals denote the same elements throughout.

[0019] It should be understood that when an element or layer is referred to as "on," "adjacent to," "connected to," or "coupled to" other elements or layers, it may be directly on, adjacent to, connected to, or coupled to other elements or layers, or there may be intervening elements or layers. Conversely, when an element is referred to as "directly on," "directly adjacent to," "directly connected to," or "directly coupled to" other elements or layers, there are no intervening elements or layers. It should be understood that although the terms first, second, third, etc., may be used to describe various elements, components, areas, layers, and / or portions, these elements, components, areas, layers, and / or portions should not be limited by these terms. These terms are only used to distinguish one element, component, area, layer, or portion from another element, component, area, layer, or portion. Therefore, without departing from the teachings of this utility model, the first element, component, area, layer, or portion discussed below may be referred to as the second element, component, area, layer, or portion.

[0020] Spatial relation terms such as “below,” “under,” “below,” “under,” “above,” “above,” etc., are used herein for convenience of description to describe the relationship between one element or feature shown in the figure and other elements or features. It should be understood that, in addition to the orientation shown in the figure, spatial relation terms are intended to also include different orientations of the device in use and operation. For example, if the device in the figure is flipped, then the element or feature described as “below,” “under,” or “below” other elements or features will be oriented “above” other elements or features. Therefore, the exemplary terms “below” and “under” can include both above and below orientations. The device may be otherwise oriented (rotated 90 degrees or otherwise) and the spatial descriptive terms used herein will be interpreted accordingly.

[0021] The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of the invention. When used herein, the singular forms “a,” “an,” and “the” are also intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that the terms “comprising” and / or “including,” when used in this specification, identify the presence of the stated features, integers, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and / or groups. When used herein, the term “and / or” includes any and all combinations of the associated listed items.

[0022] To fully understand this utility model, detailed structures and steps will be presented in the following description to illustrate the technical solution proposed by this utility model. Preferred embodiments of this utility model are described in detail below; however, in addition to these detailed descriptions, this utility model may have other embodiments.

[0023] In one embodiment, such as Figure 1 As shown, a battery over-temperature protection system is provided, comprising: Battery management module 2, first controller 11, and wireless charging device 3; The battery management module 2 and the first controller 11 are installed in the self-moving device 1. The battery management module 2 includes a battery 21. The first communication terminal L1 of the first controller 11 is electrically connected to the communication terminal D1 of the battery management module 2, and is used to acquire the temperature information of the battery 21; the second communication terminal L2 of the first controller 11 is electrically connected to the communication terminal D2 of the wireless charging device 3, and is used to output the temperature information of the battery 21 to the wireless charging device 3, and the wireless charging device 3 is used to control the charging current of the battery 21 according to the temperature information of the battery 21.

[0024] in, Figure 1 In the diagram, dashed lines represent wireless communication or wireless charging, while solid lines represent wired communication.

[0025] The first communication terminal L1 is a UART interface. The UART (Universal Asynchronous Receiver / Transmitter) interface is a hardware interface for asynchronous serial communication, widely used in computers and embedded systems. It includes a transmit line (TX) and a receive line (RX). The transmit line is used to send serial data, and the receive line is used to receive serial data. The second communication terminal is a UART interface, an SPI interface, and an I... 2 One type of C interface is the SPI (Serial Peripheral) interface, which is a synchronous serial communication interface that uses a master-slave mode and supports full-duplex communication. It includes a Master Output (MOSI) for the master device to send data and a Master Input (MISO) for the master device to receive data. 2 The C (Integrated Circuit Bus) interface is a synchronous, half-duplex, two-wire serial communication protocol widely used in embedded systems. It includes a serial data line (SDA) for data transmission and a serial clock line (SCL) for synchronous data transmission.

[0026] Controlling the charging current of battery 21 based on the temperature information of battery 21 means that the charging current of battery 21 in an over-temperature state is less than the charging current of battery 21 in a normal state. Specifically, at least two temperature threshold ranges can be set.

[0027] For example, a first temperature threshold range, a second temperature threshold range, and a third temperature threshold range can be set, with non-overlapping ranges and sequentially decreasing maximum temperatures. This allows the first controller 11 of the self-moving device 1 to determine which temperature threshold range the device is currently in based on the acquired temperature information of the battery 21, and then control the charging current of the wireless charging device 3 to decrease accordingly. The first temperature threshold range corresponds to a first charging current, the second temperature threshold range corresponds to a second charging current, and the third temperature threshold range corresponds to a third charging current. The first charging current is less than the second charging current, and the second charging current is less than the third charging current. Optionally, the first charging current can be set to half of the second charging current, and the second charging current can be set to half of the third charging current. Several temperature threshold ranges and charging currents can be set as needed, all within the scope of protection of this application.

[0028] The working process of the above battery over-temperature protection system is as follows: Step 1: The first controller 11 obtains the temperature information of the battery 21 from the communication terminal D1 of the battery management module 2; Step 2: The first controller 11 compares the temperature information with the set temperature threshold range (first temperature threshold range, second temperature threshold range and third temperature threshold range), and outputs the temperature level to the wireless charging device 3 through the second communication terminal L2 of the first controller 11; if the temperature information exceeds the highest value of the first temperature threshold range, a power-off command is output to the wireless charging device 3 through the second communication terminal L2 of the first controller 11. Step 3: The wireless charging device 3 controls the charging current of the battery 21 to decrease for charging or power-off based on the temperature level or power-off command. During the charging process, steps 1 to 3 are repeated at a preset frequency (e.g., every 5 seconds) to achieve continuous monitoring and dynamic adjustment.

[0029] The first controller 11 can be selected from ESP32, STM32F103, nRF52840, etc. ESP32 has built-in Wi-Fi (802.11 b / g / n) and Bluetooth 4.2+BLE, nRF52840 supports Bluetooth 5 / BLE / Thread / ZigBee / ANT / 2.4GHz RF, and STM32F103 can be connected to external Wi-Fi / BLE / ZigBee communication modules.

[0030] Wi-Fi (802.11 b / g / n) refers to IEEE 802.11b / g / n (Wi-Fi Standard), Bluetooth 4.2 refers to Bluetooth 4.2 (Bluetooth 4.2 standard), BLE refers to Bluetooth Low Energy, Bluetooth 5 refers to Bluetooth 5 (Bluetooth 5.0 standard), Thread refers to Thread Network Protocol (Thread Internet of Things network protocol), ZigBee refers to ZigBee Protocol (ZigBee wireless communication protocol), ANT refers to ANT / ANT+Protocol (ANT / ANT+ Ultra Low Energy Sensor Network Protocol), and 2.4GHz RF refers to 2.4 GHz Radio Frequency (2.4GHz proprietary radio frequency protocol).

[0031] In this embodiment, a communication connection is established between the first controller 11, the battery management module 2, and the wireless charging device 3 in the battery over-temperature protection system. The first controller 11 obtains the temperature information of the battery 21 from the battery management module 2 and wirelessly transmits the temperature information of the battery 21 to the wireless charging device 3. The wireless charging device 3 adjusts the charging current according to the temperature information of the battery 21 to ensure that the temperature of the battery 21 does not continue to rise, so that the battery 21 is in a stable working state. Compared with the existing mechanism that directly triggers the battery 21 to stop charging or causes overheating failure due to continued charging, the battery 21 over-temperature protection system of this application ensures the charging efficiency of the battery 21 and improves the user experience.

[0032] In one embodiment, a first wireless communication module 12 is also included. The first wireless communication module 12 is integrated into the first controller 11 or is set separately, such as... Figure 2 As shown, the first wireless communication module 12 is set separately; the wireless charging device 3 is provided with a second wireless communication module 31 and a second controller 32. The self-moving device 1 is used to send the temperature information to the second wireless communication module 31 through the first wireless communication module 12, and the second controller 32 is used to confirm the over-temperature state of the battery 21 based on the temperature information.

[0033] The working process of the aforementioned battery over-temperature protection system is as follows: Step 1: The first controller 11 obtains the temperature information of the battery 21 from the communication terminal D1 of the battery management module 2; Step 2: The first controller 11 compares the temperature information with the set temperature threshold range (first temperature threshold range, second temperature threshold range and third temperature threshold range), and outputs the temperature level to the second wireless communication module 31 through the first wireless communication module 12; if the temperature information exceeds the highest value of the first temperature threshold range, the first wireless communication module 12 outputs a power-off command to the second wireless communication module 31. The second wireless communication module 31 sends the temperature rating or power-off command to the second controller 32. Step 3: The second controller 32 controls the charging current of the battery 21 to decrease for charging or power-off according to the temperature level or power-off command. During the charging process, steps 1 to 3 are repeated at a preset frequency (e.g., every 5 seconds) to achieve continuous monitoring and dynamic adjustment.

[0034] The second controller 32 can be selected from ESP32, STM32F1 / F4, bqTESLA, etc. STM32F1 / F4 requires an external communication module, while bqTESLA requires an external MCU.

[0035] In this embodiment, a first wireless communication module 12 and a second wireless communication module 31 are set in the battery over-temperature protection system. The temperature information of the battery 21 is wirelessly transmitted to the second wireless communication module 31 through the first wireless communication module 12. A second controller 32 is set to confirm the over-temperature state based on the temperature information of the battery 21 and adjust the charging current to ensure that the temperature of the battery 21 does not continue to rise, so that the battery 21 is in a stable working state. Compared with the existing mechanism that directly triggers the battery 21 to stop charging or causes overheating failure due to continued charging, the battery over-temperature protection system of this application ensures the charging efficiency of the battery 21 and improves the user experience.

[0036] In one embodiment, such as Figure 3 As shown, it also includes a wireless charging receiver module 13 for providing power supply signals to the battery 21. The wireless charging device 3 is provided with a wireless charging transmitter module 33, which is interconnected with the second controller 32. The wireless charging transmitter module 33 is used to transmit electrical energy to the wireless charging receiver module 13 through wireless transmission.

[0037] The wireless charging transmitter module 33 transmits PWM control signals and enable signals to the second controller 32, and receives feedback signals (fault or temperature) from the second controller 32. Transmitting electrical energy wirelessly is an existing technology. When the wireless charging receiver module 13 successfully communicates with the wireless charging transmitter module 33 and confirms that the charging power parameters are set correctly, the wireless charging transmitter module 33 outputs the first charging current to the wireless charging receiver module 13. The wireless charging receiver module 13 then connects to the battery 21 and begins charging the battery 21.

[0038] In this embodiment, a wireless charging transmitter module 33 is provided in the wireless charging device 3 to output charging current, and a wireless charging receiver module 13 is provided in the self-moving device 1 to receive the charging current and convert it into a power supply signal to charge the battery 21. During the charging process, according to a preset frequency, the second wireless communication module 31 sends a temperature level or power-off command to the second controller 32. The second controller 32 controls the power supply voltage of the wireless charging transmitter module 33 through PWM / MOS according to the temperature level or power-off command, thereby indirectly adjusting the transmission power and controlling the charging current of the battery 21.

[0039] In one embodiment, such as Figure 4 As shown, the battery management module 2 further includes a third controller 22 and a temperature sensing unit 23. The third controller 22 is electrically connected to the output terminal of the temperature sensing unit 23 and is used to obtain the temperature information of the battery 21. The third controller 22 is also connected to the first communication terminal L1 of the first controller 11.

[0040] The temperature sensing unit 23 collects the temperature of the battery 21 in real time and then outputs it to the third controller 22 through the output terminal of the temperature sensing unit 23.

[0041] The working process of the above battery over-temperature protection system is as follows: Step 1: The third controller 22 obtains the temperature information of the battery 21 from the output of the temperature sensing unit 23; Step 2: The first controller 11 receives temperature information through the first communication terminal L1, and then compares the temperature information with the set temperature threshold range (first temperature threshold range, second temperature threshold range and third temperature threshold range), and outputs the temperature level to the second wireless communication module 31 through the first wireless communication module 12; if the temperature information exceeds the highest value of the first temperature threshold range, the first wireless communication module 12 outputs a power-off command to the second wireless communication module 31. The second wireless communication module 31 sends the temperature rating or power-off command to the second controller 32. Step 3: The second controller 32 controls the charging current of the battery 21 to decrease for charging or power-off according to the temperature level or power-off command. During the charging process, steps 2-3 are repeated at a preset frequency (e.g., every 5 seconds) to achieve continuous monitoring and dynamic adjustment.

[0042] The third controller 22 can be selected from JBD-SP04S002, LI-ION BMS - ANT series, TI BQ769x0 series, etc. JBD refers to Kabrita, LI-ION refers to lithium-ion, and BMS refers to Battery Management System.

[0043] In this embodiment, a third controller 22 and a temperature sensing unit 23 are set in the battery management module 2 to detect the temperature of the battery 21 in real time, ensuring that over-temperature protection measures can be taken in time to reduce the risk of system damage and keep the battery 21 in a stable working state. Compared with the existing mechanism that directly triggers the battery 21 to stop charging or causes overheating failure due to continued charging, the battery over-temperature protection system of this application ensures the charging efficiency of the battery 21 and improves the user experience.

[0044] In one embodiment, such as Figure 4 As shown, the battery management module 2 further includes a charging control module 24, the input terminal of which is connected to the output terminal of the wireless charging receiver module 13, the output terminal of which is connected to the charging input terminal of the third controller 22, and the charging output terminal of the third controller 22 is connected to the power supply terminal of the battery 21, for outputting a power supply signal to the battery 21.

[0045] The output of the wireless charging receiver module 13 (usually 5V or 9V) cannot be directly connected to the power supply of the battery 21. Therefore, the battery 21 needs to be charged through the charging control module 24 and the third controller 22. The charging control module 24 is responsible for realizing maximum power point tracking (MPPT) and constant voltage and constant current charging control based on the output of the wireless charging receiver module 13. The third controller 22 is used to realize overvoltage, overtemperature, short circuit and other protections for the battery 21.

[0046] The charging control module 24 can be selected from BQ24650, TP4056, BQ24075, etc.

[0047] In this embodiment, a charging control module 24 is set in the battery management module 2 to control the charging of the battery 21. When the battery 21 overheats, the charging control module 24 ensures that the temperature of the battery 21 will not continue to rise, so that the battery 21 is in a stable working state. Compared with the existing mechanism that directly triggers the battery 21 to stop charging or causes overheating failure due to continued charging, the battery overheat protection system of this application ensures the charging efficiency of the battery 21 and improves the user experience.

[0048] In one embodiment, such as Figure 4As shown, a switch 25 is provided between the charging output terminal of the third controller 22 and the power supply terminal of the battery 21 to control whether the charging current enters the battery 21.

[0049] The third controller 22 is connected to the switch via a drive circuit to control the on / off state of the switch 25. The switch 25 can be a MOSFET. When the third controller 22 outputs a high level, the gate of the MOSFET is turned on, allowing charging. When the third controller 22 outputs a low level, the MOSFET is turned off, preventing charging.

[0050] In this embodiment, the third controller 22 controls the opening and closing of the switch 25 to control the conduction and disconnection of the charging control module 24, thereby controlling whether the battery 21 is powered. When the battery 21 triggers over-temperature protection, the charging current is reduced first, and charging is only cut off after the temperature of the battery 21 reaches the maximum threshold, ensuring that the temperature of the battery 21 does not continue to rise and keeping the battery 21 in a stable working state. Compared with the existing mechanism that directly triggers the battery 21 to stop charging or causes overheating failure due to continued charging, the battery over-temperature protection system of this application ensures the charging efficiency of the battery 21 and improves the user experience.

[0051] In one embodiment, the temperature sensing unit 23 includes at least one thermistor connected to the third controller 22.

[0052] Among them, the thermistors are located at the center and the edge of the battery management module 2, respectively. When the third controller 22 collects multiple temperature data, it prioritizes the data with the higher temperature value as the basis for judgment.

[0053] Alternatively, one thermistor can be selected as the main sensor, and the others as backup sensors. When the main sensor malfunctions, the data from the backup sensors is used to ensure the reliability of the over-temperature protection.

[0054] In this embodiment, a thermistor is set in the temperature sensing unit 23 and connected to the third controller. The temperature data is collected in real time and transmitted to the third controller 22. The third controller 22 then uses the collected data as a basis for judgment, which improves the reliability of the over-temperature protection system.

[0055] In one embodiment, the wireless charging transmitter module 33 includes a transmitter coil, a power drive circuit, and a transmitter control chip connected in sequence to the output and input; the wireless charging receiver module 13 includes a receiver coil, a resonant capacitor, a rectifier circuit, a receiver control chip, and a voltage regulator output circuit connected in sequence to the output and input; the receiver coil and the transmitter coil are used for magnetic field coupling to induce alternating current, and the receiver control chip is also connected to the transmitter control chip through a communication feedback channel.

[0056] Specifically, the output of the transmission control chip is electrically connected to the control terminal of the power drive circuit to provide a drive signal; the output of the power drive circuit is electrically connected to the transmission coil to convert DC power into high-frequency AC power and drive the transmission coil to generate an alternating magnetic field to achieve wireless energy transmission. The receiving coil and the transmitting coil are magnetically coupled to induce alternating current, which forms a resonant circuit with the receiving coil via a resonant capacitor; the rectifier circuit rectifies the alternating current into direct current; the receiving control chip is used to adjust the output voltage and current and transmit feedback information (temperature, current, voltage requirements) to the transmitting control chip through the communication feedback channel; the voltage regulation output circuit is used to output stable direct current for use by the battery management module 2.

[0057] The transmit control chip and receive control chip can be selected from TI bq500212A and TI bq51013B respectively; TI refers to Texas Instruments.

[0058] Optionally, the wireless charging transmitter module 33 also includes a foreign object detection unit and a temperature protection unit. Both the foreign object detection unit and the temperature protection unit are electrically connected to the transmitter control chip and are used to reduce or shut down the transmitter power when a foreign object is detected or the temperature is too high, thereby ensuring the safety of the wireless charging process.

[0059] The foreign object detection unit determines whether there is a foreign object by detecting the difference between the transmission power and the power reported by the wireless charging receiver module 13; the temperature protection unit is used to detect whether the power devices or the transmission coil in the wireless charging transmitter module 33 are overheated.

[0060] In this embodiment, the wireless charging transmitter module 33 is equipped with a transmitter coil, a power drive circuit, and a transmitter control chip to convert DC power and drive the transmitter to generate an alternating magnetic field, thereby achieving wireless energy transmission. The wireless charging receiver module 13 is equipped with a receiver coil, a resonant capacitor, a rectifier circuit, a receiver control chip, and a voltage regulator output circuit to sense AC power, convert AC power to DC power, and output stable DC power to the power management module 2. When the battery 21 overheats, the charging current is reduced first, and charging is only cut off after the temperature of the battery 21 reaches the maximum threshold, ensuring that the temperature of the battery 21 does not continue to rise and keeping the battery 21 in a stable working state. Compared with the existing mechanism that directly triggers the battery 21 to stop charging or causes overheating failure due to continued charging, the battery overheat protection system of this application ensures the charging efficiency of the battery 21 and improves the user experience.

[0061] In one embodiment, such as Figure 2 As shown, a self-moving device 1 is provided, which is equipped with a battery management module 2 and a first controller 11 in the battery over-temperature protection system described in the above embodiments.

[0062] In this embodiment, the first controller 11 communicates with the battery management module 2 and the wireless charging device 3. The first controller 11 obtains the temperature information of the battery 21 from the battery management module 2 and transmits the temperature information of the battery 21 to the wireless charging device 3. The wireless charging device 3 adjusts the charging current according to the temperature information to ensure that the temperature of the battery 21 does not continue to rise, so that the battery 21 is in a stable working state. Compared with the existing mechanism that directly triggers the battery 21 to stop charging or causes overheating failure due to continued charging, the battery overheat protection system of this application ensures the charging efficiency of the battery 21 and improves the user experience.

[0063] The above-described embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model, and should all be included within the protection scope of this utility model.

Claims

1. A battery over-temperature protection system, characterized by, include: Battery management module, first controller, and wireless charging device; The battery management module and the first controller are installed in the self-moving device, and the battery management module includes a battery. The first communication terminal of the first controller is electrically connected to the communication terminal of the battery management module for acquiring battery temperature information; the second communication terminal of the first controller is connected to the communication terminal of the wireless charging device for outputting the battery temperature information to the wireless charging device, and the wireless charging device is used to control the charging current of the battery according to the battery temperature information.

2. The battery over-temperature protection system of claim 1, wherein, It also includes a first wireless communication module, which is integrated into the first controller or set separately; the wireless charging device is provided with a second wireless communication module and a second controller, the first wireless communication module is used to send the temperature information to the second wireless communication module, and the second controller is used to control the charging current of the battery according to the temperature information.

3. The battery over-temperature protection system according to claim 2, characterized in that, It also includes a wireless charging receiver module for providing power supply signals to the battery. The wireless charging device is equipped with a wireless charging transmitter module, which is interconnected with the second controller. The wireless charging transmitter module is used to transmit electrical energy to the wireless charging receiver module via wireless transmission.

4. The battery over-temperature protection system according to any one of claims 1 to 3, characterized in that, The battery management module includes a third controller and a temperature sensing unit. The third controller is electrically connected to the output terminal of the temperature sensing unit and is used to acquire battery temperature information. The third controller is also connected to the first communication terminal of the first controller.

5. The battery over-temperature protection system according to claim 4, characterized in that, The battery management module further includes a charging control module, wherein the input terminal of the charging control module is connected to the output terminal of the wireless charging receiver module, the output terminal is connected to the charging input terminal of the third controller, and the charging output terminal of the third controller is connected to the power supply terminal of the battery, for outputting a power supply signal to the battery.

6. The battery over-temperature protection system according to claim 5, characterized in that, A switch is provided between the charging output terminal of the third controller and the power supply terminal of the battery to control whether the charging current enters the battery.

7. The battery over-temperature protection system according to claim 4, characterized in that, The temperature sensing unit includes at least one thermistor that is connected to the third controller.

8. The battery over-temperature protection system according to claim 3, characterized in that, The wireless charging transmitter module includes a transmitter coil, a power drive circuit, and a transmitter control chip connected in sequence to the output and input; the wireless charging receiver module includes a receiver coil, a resonant capacitor, a rectifier circuit, a receiver control chip, and a voltage regulator output circuit connected in sequence to the output and input; the receiver coil and the transmitter coil are used for magnetic field coupling to induce alternating current, and the receiver control chip is also connected to the transmitter control chip through a communication feedback channel.

9. The battery over-temperature protection system according to claim 8, characterized in that, The wireless charging transmitter module also includes a foreign object detection unit and a temperature protection unit, both of which are electrically connected to the transmitter control chip.

10. A self-moving device, characterized in that, The self-moving device is equipped with a battery management module and a first controller as described in any one of claims 1 to 9 of the battery over-temperature protection system.

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