Battery leakage prevention monitoring method and device

Abstract

The application provides a battery anti-creeping monitoring method and device. The method comprises the following steps: obtaining a creeping short-circuit signal of a battery; performing signal value conversion processing on the creeping short-circuit signal and a preset short-circuit signal to obtain an electric short difference component; and sending a battery start-stop signal to a battery management protection system according to the electric short difference component to adjust the electric energy output state of the battery. Through detection of the creeping short-circuit state of the battery, the current discharge capacity of the battery is determined, the creeping short-circuit signal is compared with the preset short-circuit signal, the difference between the battery voltage and the normal voltage is determined, the under-voltage condition of the battery is determined, and finally, according to the under-voltage degree reflected by the electric short difference component, the current electric energy output of the battery is controlled through the battery management protection system, and the probability of battery cell death is effectively reduced.

Description

Technical Field

[0001] This invention relates to the field of battery technology, and in particular to a battery leakage prevention monitoring method and device. Background Technology

[0002] With the development of science and technology, new energy sources have become particularly prominent in our lives. Currently, we advocate green and environmentally friendly practices, and the market has seen the emergence of many power tools such as new energy vehicles, electric vehicles, and various vacuum cleaners, sweepers, and robots. All of these tools rely on power sources.

[0003] However, if these power tools are not used for a long time, that is, if they are not charged, the battery cells may die. This cell death is a problem that needs to be considered at present, as cell death often leads to a significant reduction in battery life. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings of the prior art and provide a battery leakage monitoring method and device that effectively reduces the probability of battery cell failure.

[0005] The objective of this invention is achieved through the following technical solution:

[0006] A battery leakage prevention monitoring method, the method comprising:

[0007] Obtain the battery leakage short-circuit signal;

[0008] The leakage current short-circuit signal and the preset short-circuit signal are subjected to signal value conversion processing to obtain the electrical short differential component;

[0009] The battery power output state of the battery is adjusted by sending a battery start-up / shutdown signal to the battery management and protection system based on the electrical short differential component.

[0010] In one embodiment, the step of performing signal-to-signal conversion processing on the leakage short-circuit signal and a preset short-circuit signal to obtain an electrical short-circuit differential component includes: obtaining a battery short-circuit value based on the leakage short-circuit signal; and performing a short-circuit differential operation on the battery short-circuit value and the short-circuit value corresponding to the preset short-circuit signal to obtain the electrical short-circuit differential component.

[0011] In one embodiment, the step of sending a battery start-up / shutdown signal to the battery management and protection system based on the electrical short differential component to adjust the battery's power output state includes: detecting whether the electrical short differential component is greater than or equal to a first differential component; when the electrical short differential component is greater than or equal to the first differential component, sending a battery start-up signal to the battery management and protection system to close the battery terminal switch.

[0012] In one embodiment, after detecting whether the electrical short differential component is greater than or equal to the first differential component, the method further includes: when the electrical short differential component is less than the first differential component, sending a battery shutdown signal to the battery management and protection system to disconnect the battery terminal switch.

[0013] In one embodiment, the step of sending a battery shutdown signal to the battery management and protection system when the electrical short differential component is less than the first differential component to disconnect the battery terminal switch includes: when the electrical short differential component is less than the first differential component, detecting whether the electrical short differential component matches a second differential component; and when the electrical short differential component matches the second differential component, sending a first battery leakage protection status signal to the battery management and protection system.

[0014] In one embodiment, the second difference component is smaller than the first difference component.

[0015] In one embodiment, the step of detecting whether the electrical short differential component matches the second differential component further includes: when the electrical short differential component does not match the second differential component, detecting whether the electrical short differential component matches the third differential component; and when the electrical short differential component matches the third differential component, sending a battery standby status signal to the battery management and protection system.

[0016] In one embodiment, the step of detecting whether the electrical short differential component matches the third differential component further includes: when the electrical short differential component does not match the third differential component, detecting whether the electrical short differential component matches the fourth differential component; when the electrical short differential component matches the fourth differential component, sending a second battery leakage protection status signal to the battery management and protection system.

[0017] In one embodiment, the step of detecting whether the electrical short differential component matches the fourth differential component further includes: when the electrical short differential component does not match the fourth differential component, sending a battery power-on alarm signal to the battery management and protection system.

[0018] A battery leakage current monitoring device includes: a battery short-circuit acquisition unit and a battery leakage current prevention main board; the battery short-circuit acquisition unit is used to acquire the leakage current short-circuit signal of the battery; the input terminal of the battery leakage current prevention main board is connected to the output terminal of the battery short-circuit acquisition unit, and the output terminal of the battery leakage current prevention main board is used to connect to a battery management and protection system; the battery leakage current prevention main board is used to perform signal-to-signal conversion processing on the leakage current short-circuit signal and a preset short-circuit signal to obtain an electrical short differential component; and sends a battery start-up / shutdown signal to the battery management and protection system according to the electrical short differential component to adjust the battery's power output state.

[0019] Compared with the prior art, the present invention has at least the following advantages:

[0020] By detecting the leakage short-circuit state of the battery, it is easy to determine the current discharge capacity of the battery. By comparing the leakage short-circuit signal with the preset short-circuit signal, it is easy to determine the degree of difference between the battery voltage and the normal voltage, and thus the undervoltage condition of the battery. Finally, based on the degree of undervoltage reflected by the short-circuit differential component, it is easy to control the current power output of the battery through the battery management and protection system, effectively reducing the probability of battery cell failure. Attached Figure Description

[0021] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is a flowchart of a battery leakage prevention monitoring method in one embodiment;

[0023] Figure 2 This is a circuit diagram of a battery leakage protection monitoring circuit in one embodiment;

[0024] Figure 3 for Figure 2 The diagram shows the battery management chip connected to the battery leakage protection monitoring circuit. Detailed Implementation

[0025] To facilitate understanding of the present invention, a more complete description will be given below with reference to the accompanying drawings. Preferred embodiments of the invention are shown in the drawings. However, the invention can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a thorough and complete understanding of the disclosure of the invention.

[0026] It should be noted that when an element is referred to as being "fixed to" another element, it can be directly attached to the other element or there may be an intervening element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0027] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0028] This invention relates to a battery leakage current monitoring method. In one embodiment, the battery leakage current monitoring method includes acquiring a battery leakage short-circuit signal; performing signal-to-signal conversion processing on the leakage short-circuit signal and a preset short-circuit signal to obtain an electrical short-circuit differential component; and sending a battery start-up / shutdown signal to a battery management and protection system based on the electrical short-circuit differential component to adjust the battery's power output state. By detecting the battery's leakage short-circuit state, the current discharge capacity of the battery can be easily determined. By comparing the leakage short-circuit signal with the preset short-circuit signal, the degree of difference between the battery voltage and the normal voltage can be easily determined, thereby facilitating the determination of the battery's undervoltage condition. Finally, based on the undervoltage degree reflected by the electrical short-circuit differential component, the current power output of the battery can be controlled by the battery management and protection system, effectively reducing the probability of battery cell failure.

[0029] Please see Figure 1 This is a flowchart of a battery leakage prevention monitoring method according to an embodiment of the present invention. The battery leakage prevention monitoring method includes some or all of the following steps.

[0030] S100: Obtain the battery leakage short-circuit signal.

[0031] In this embodiment, the leakage short-circuit signal includes various battery power output status signals. For example, the leakage short-circuit signal includes the supply voltage signal output by the battery through the battery management chip; or, for example, the leakage short-circuit signal includes the short-circuit voltage signal between the positive terminal of the battery and the detection terminal of the leakage detection circuit on the protection board. Thus, by acquiring the leakage short-circuit signal, it is easy to determine the current power output status of the battery, thereby facilitating subsequent determination of whether the battery is over-discharged, and further facilitating the determination of the battery's output status based on the battery's undervoltage condition.

[0032] S200: The leakage short-circuit signal and the preset short-circuit signal are subjected to signal value conversion processing to obtain the electrical short differential component.

[0033] In this embodiment, the leakage short-circuit signal is a battery power output status signal, that is, the current power supply and short-circuit output status of the battery, reflecting the power supply voltage and detection load voltage provided by the battery to the protection board. The preset short-circuit signal is a standard power output status signal of the battery, serving as a reference voltage for the battery's power supply and short-circuit conditions; that is, the preset short-circuit signal acts as a comparison benchmark status signal for the leakage short-circuit signal. By performing signal value conversion processing on the leakage short-circuit signal and the preset short-circuit signal, the state difference between the two signals can be easily obtained, thereby facilitating the determination of the degree of power output difference of the battery under leakage short-circuit conditions, and further facilitating the determination of the battery's undervoltage condition.

[0034] S300: Send a battery start / stop signal to the battery management and protection system according to the electrical short differential component to adjust the power output state of the battery.

[0035] In this embodiment, the electrical short-circuit component represents the state difference between the leakage short-circuit signal and the preset short-circuit signal. Specifically, the electrical short-circuit component reflects the degree of difference in the battery's power output under leakage short-circuit conditions, indicating the battery's undervoltage status. The magnitude of the electrical short-circuit component determines the current power output change of the battery. Based on the magnitude of the electrical short-circuit component, it is easy to determine whether the battery is currently undervoltage, thus facilitating the output of corresponding battery management signals (i.e., battery start-up / shutdown signals) to the battery management and protection system. This allows for monitoring and regulation of the battery's current power output state, enabling timely shutdown of the output when the battery is undervoltage, reducing the probability of cell failure and effectively extending the battery's lifespan.

[0036] In the above embodiments, by detecting the leakage short-circuit state of the battery, it is easy to determine the current discharge capacity of the battery. By comparing the leakage short-circuit signal with the preset short-circuit signal, it is easy to determine the degree of difference between the battery voltage and the normal voltage, and thus it is easy to determine the undervoltage condition of the battery. Finally, based on the degree of undervoltage reflected by the short-circuit differential component, it is easy to control the current power output of the battery through the battery management and protection system, effectively reducing the probability of battery cell failure.

[0037] In one embodiment, the step of performing signal-to-signal conversion processing on the leakage short-circuit signal and a preset short-circuit signal to obtain an electrical short-circuit differential component includes: obtaining a battery short-circuit value based on the leakage short-circuit signal; and performing a short-circuit differential operation on the battery short-circuit value and the short-circuit value corresponding to the preset short-circuit signal to obtain the electrical short-circuit differential component. In this embodiment, the leakage short-circuit signal includes the battery short-circuit value, which reflects the current supply voltage and monitored output voltage of the battery. The short-circuit value corresponding to the preset short-circuit signal is the supply voltage and monitored output voltage output by the battery during normal operation. Performing the short-circuit differential operation on the battery short-circuit value and the short-circuit value corresponding to the preset short-circuit signal detects the difference in the current power output state of the battery, so as to determine the change in the current output voltage of the battery. This facilitates subsequent determination of the undervoltage condition of the battery based on the electrical short-circuit differential component, thereby facilitating subsequent adjustment of the power output state of the battery and effectively reducing the probability of battery cell failure.

[0038] In one embodiment, the step of sending a battery start / stop signal to the battery management and protection system based on the electrical short-circuit component to adjust the battery's power output state includes: detecting whether the electrical short-circuit component is greater than or equal to a first differential component; when the electrical short-circuit component is greater than or equal to the first differential component, sending a battery start signal to the battery management and protection system to close the battery terminal switch. In this embodiment, the electrical short-circuit component is the state difference between the leakage short-circuit signal and the preset short-circuit signal, that is, the electrical short-circuit component represents the degree of difference in the battery's power output under leakage short-circuit conditions, and also reflects the battery's undervoltage condition. The first differential component is a standard comparison quantity for the first battery power output state of the electrical short differential component. The first differential component is used to reflect a common power output state of the battery. Specifically, the first differential component corresponds to a normal supply voltage provided by the battery management chip and a short circuit between the battery's positive terminal and the detection terminal of the protection board. For example, both the battery short circuit value and the short circuit value corresponding to the preset short circuit signal are two-bit codes. The short circuit value corresponding to the preset short circuit signal is 0, with a corresponding code of 00. From right to left, the first bit is the state bit corresponding to the short circuit between the battery's positive terminal and the detection terminal of the protection board, and the second bit is the state bit corresponding to the supply voltage provided by the battery management chip. The first differential component has a value of 3, with a corresponding code of 11. Thus, if the electrical short differential component is greater than or equal to the first differential component, it indicates that the battery is in a normal output and voltage state, meaning that the battery is not experiencing undervoltage output. A battery activation signal is sent to the battery management and protection system to close the battery terminal switch, ensuring normal power output from the battery.

[0039] Further, the step of detecting whether the electrical short-circuit component is greater than or equal to the first differential component further includes: when the electrical short-circuit component is less than the first differential component, sending a battery shutdown signal to the battery management and protection system to disconnect the battery terminal switch. In this embodiment, the electrical short-circuit component is the state difference between the leakage short-circuit signal and the preset short-circuit signal, that is, the electrical short-circuit component represents the degree of difference in the battery's power output under leakage short-circuit conditions, and also reflects the undervoltage condition of the battery. The first differential component is a standard comparison quantity for the first battery power output state of the electrical short differential component. The first differential component reflects a common power output state of the battery. Specifically, the first differential component corresponds to a situation where the battery's supply voltage provided by the battery management chip is normal, and the battery's positive terminal is short-circuited to the detection terminal of the protection board. For example, both the battery short-circuit value and the short-circuit value corresponding to the preset short-circuit signal are two-bit codes. The short-circuit value corresponding to the preset short-circuit signal is 0, with the corresponding code being 00. From right to left, the first bit is the state bit corresponding to the short circuit between the battery's positive terminal and the detection terminal of the protection board, and the second bit is the state bit corresponding to the supply voltage provided by the battery management chip. The first differential component has a value of 3, with the corresponding code being 11. Thus, if the electrical short differential component is less than the first differential component, it indicates that the battery is in a normal output state or a voltage abnormal state, meaning that the battery may be undervoltage. A battery shutdown signal is sent to the battery management and protection system to disconnect the battery terminal switch, ensuring that the battery output is disconnected to prevent the battery cells from being drained.

[0040] Furthermore, the step of sending a battery shutdown signal to the battery management and protection system when the electrical short-circuit component is less than the first differential component to disconnect the battery terminal switch includes: when the electrical short-circuit component is less than the first differential component, detecting whether the electrical short-circuit component matches a second differential component; when the electrical short-circuit component matches the second differential component, sending a first battery leakage protection status signal to the battery management and protection system. In this embodiment, the electrical short-circuit component is the state difference between the leakage short-circuit signal and the preset short-circuit signal, that is, the electrical short-circuit component represents the degree of difference in the battery's power output under leakage short-circuit conditions, and also reflects the undervoltage condition of the battery. The second differential component is a standard comparison quantity of the second battery power output state of the electrical short differential component. The second differential component is used to reflect an abnormal power output state of the battery. Specifically, the second differential component corresponds to the battery supply voltage provided by the battery management chip being too low, and the positive terminal of the battery being short-circuited with the detection terminal of the protection board. For example, the battery short-circuit value and the short-circuit value corresponding to the preset short-circuit signal are both two-bit codes. The short-circuit value corresponding to the preset short-circuit signal is 0, and the corresponding code is 00. From right to left, the first bit is the state bit corresponding to the short circuit between the positive terminal of the battery and the detection terminal of the protection board, and the second bit is the state bit corresponding to the supply voltage provided by the battery through the battery management chip. The value of the second differential component is 2, and the corresponding code is 10. Thus, the electrical short differential component matches the second differential component, indicating that the battery is in an undervoltage output state, meaning the battery's supply voltage is too low. A first battery leakage protection signal is sent to the battery management and protection system to disconnect the battery terminal switch and output the battery's undervoltage status as a signal for timely detection. The second differential component is smaller than the first differential component.

[0041] Furthermore, the step of detecting whether the electrical short-circuit component matches the second differential component further includes: when the electrical short-circuit component does not match the second differential component, detecting whether the electrical short-circuit component matches the third differential component; when the electrical short-circuit component matches the third differential component, sending a battery standby state signal to the battery management and protection system. In this embodiment, the electrical short-circuit component is the state difference between the leakage short-circuit signal and the preset short-circuit signal, that is, the electrical short-circuit component represents the degree of difference in power output of the battery under leakage short-circuit conditions, and also reflects the undervoltage condition of the battery. The third differential component is a standard comparison quantity of the second battery power output state of the electrical short-circuit differential component. The third differential component is used to reflect a standby output state of the battery. Specifically, the third differential component corresponds to the battery supply voltage provided by the battery management chip being normal, but the positive terminal of the battery is not short-circuited with the detection terminal of the protection board. For example, the battery short-circuit value and the short-circuit value corresponding to the preset short-circuit signal are both two-bit codes. The short-circuit value corresponding to the preset short-circuit signal is 0, and the corresponding code is 00. From right to left, the first bit is the state bit corresponding to the short-circuit of the positive terminal of the battery with the detection terminal of the protection board, and the second bit is the state bit corresponding to the supply voltage provided by the battery through the battery management chip. The value of the third differential component is 1, and the corresponding code is 01. Thus, the electrical short differential component matches the third differential component, indicating that the battery is in standby output mode. This means that the battery has a normal supply voltage but is not conducting with the protection board. A battery standby status signal is sent to the battery management and protection system to disconnect the battery terminal switch and output the battery standby status as a signal for timely acquisition. The third differential component is smaller than the second differential component.

[0042] Furthermore, the step of detecting whether the electrical short-circuit component matches the third differential component further includes: when the electrical short-circuit component does not match the third differential component, detecting whether the electrical short-circuit component matches the fourth differential component; when the electrical short-circuit component matches the fourth differential component, sending a second battery leakage protection status signal to the battery management and protection system. In this embodiment, the electrical short-circuit component is the state difference between the leakage short-circuit signal and the preset short-circuit signal, that is, the electrical short-circuit component represents the degree of difference in the battery's power output under leakage short-circuit conditions, and also reflects the undervoltage condition of the battery. The fourth differential component is a standard comparison quantity of the second battery power output state of the electrical short-circuit differential component. The fourth differential component is used to reflect another undervoltage state of the battery. Specifically, the fourth differential component corresponds to the battery supply voltage provided by the battery management chip being too low, but the positive terminal of the battery is not short-circuited with the detection terminal of the protection board. For example, the battery short-circuit value and the short-circuit value corresponding to the preset short-circuit signal are both two-bit codes. The short-circuit value corresponding to the preset short-circuit signal is 0, and the corresponding code is 00. From right to left, the first bit is the state bit corresponding to the short connection between the positive terminal of the battery and the detection terminal of the protection board, and the second bit is the state bit corresponding to the supply voltage provided by the battery through the battery management chip. The value of the fourth differential component is 0, and the corresponding code is 00. Thus, the electrical short-circuit differential component matches the fourth differential component, indicating that the battery is in an undervoltage open-circuit state. This means that although the battery has a normal supply voltage, it is not conducting with the protection board. A second battery leakage protection status signal is sent to the battery management and protection system to output the battery's current undervoltage open-circuit state as a signal, facilitating timely acquisition of the battery's undervoltage open-circuit output status. The fourth differential component is smaller than the third differential component.

[0043] In another embodiment, after detecting whether the electrical short-circuit component matches the fourth differential component, the method further includes: when the electrical short-circuit component does not match the fourth differential component, sending a battery power-on alarm signal to the battery management and protection system. In this embodiment, the electrical short-circuit component is the state difference between the leakage short-circuit signal and the preset short-circuit signal, that is, the electrical short-circuit component represents the degree of difference in the battery's power output under leakage short-circuit conditions, and is used to reflect the battery's undervoltage condition. The fourth differential component is a standard comparison quantity of the second battery power output state of the electrical short-circuit differential component. The fourth differential component is used to reflect another undervoltage state of the battery. Specifically, the fourth differential component corresponds to the battery supply voltage provided by the battery management chip being too low, but the positive terminal of the battery is not short-circuited with the detection terminal of the protection board. For example, the battery short-circuit value and the short-circuit value corresponding to the preset short-circuit signal are both two-bit codes. The short-circuit value corresponding to the preset short-circuit signal is 0, and the corresponding code is 00. From right to left, the first bit is the state bit corresponding to the short connection between the positive terminal of the battery and the detection terminal of the protection board, and the second bit is the state bit corresponding to the supply voltage provided by the battery through the battery management chip. The value of the fourth differential component is 0, and the corresponding code is 00. Thus, the mismatch between the electrical short differential component and the fourth differential component indicates that the battery is in a voltage jump state. This means that although the battery has a normal supply voltage, it is frequently disconnected or contacted with the detection terminal of the protection board. The battery sends a battery power-on alarm signal to the battery management and protection system to output the current abnormal power-on state of the battery in the form of a signal, so as to facilitate timely acquisition of the abnormal power-on output state of the battery.

[0044] Understandably, the battery is powered by a protection board, and the battery management chip provides a reference power supply voltage to the protection board to ensure the normal operation of the detection circuit of the protection board. The positive terminal of the battery is also shorted to the detection terminal on the protection board so that the protection board can supply power to other devices.

[0045] However, when the leakage short-circuit signal is obtained, if the battery has been unused for a long time, there may be poor contact between the positive terminal of the battery and the detection terminal on the protection board. This can easily cause the detection terminal on the protection board to fail to short-circuit with the positive terminal of the battery, which may lead to the battery with normal voltage being mistakenly identified as being in an undervoltage state, and thus easily cause the battery's power output status to be output incorrectly.

[0046] To improve the accuracy of leakage current monitoring of the battery, i.e., to reduce the probability of misjudging the battery's undervoltage shutdown output, the following steps are included before acquiring the battery's leakage current short-circuit signal:

[0047] Obtain the light flux of the positive electrode short-circuited in the battery;

[0048] Detect whether the light flux of the positive electrode short circuit is greater than the preset light flux;

[0049] When the positive electrode short-circuit luminous flux is greater than the preset luminous flux matching, a battery positive electrode disconnection signal is sent to the battery management and protection system.

[0050] In this embodiment, the positive electrode short-circuit luminous flux is the luminous flux at the contact point between the positive electrode of the battery and the detection terminal on the protection board. In other words, the positive electrode short-circuit luminous flux represents the light transmission intensity between the positive electrode of the battery and the detection terminal on the protection board, and thus reflects the size of the gap between them. The positive electrode short-circuit luminous flux serves as the real-time contact determination criterion between the positive electrode of the battery and the detection terminal on the protection board. The preset luminous flux is the luminous flux when the positive electrode of the battery and the detection terminal on the protection board are fully short-circuited. In other words, the preset luminous flux represents the light transmission intensity when the positive electrode of the battery and the detection terminal on the protection board are normally electrically connected, and thus reflects the standard gap when the positive electrode of the battery and the detection terminal on the protection board are fully connected. In this way, the light flux of the positive electrode short circuit is greater than the preset light flux matching, indicating that the light flux between the positive electrode of the battery and the detection terminal on the protection board is large. This indicates that the light transmission intensity between the positive electrode of the battery and the detection terminal on the protection board is too strong, which means that the positive electrode of the battery and the detection terminal on the protection board have separated. At this time, the positive electrode of the battery is disconnected from the detection terminal on the protection board and sends a positive electrode disconnection signal to the battery management and protection system. This allows for monitoring of the electrical disconnection between the positive electrode of the battery and the detection terminal on the protection board, avoiding the misinterpretation of the current disconnection state of the positive electrode of the battery as an undervoltage state, and effectively improving the accuracy of the battery leakage prevention monitoring.

[0051] Furthermore, during the long-term disuse of the battery, electrochemical corrosion may occur between the positive electrode of the battery and the detection terminal on the protection board. Specifically, metal oxides may easily form between the positive electrode and the detection terminal on the protection board. These metal oxides fill the gap between the positive electrode and the detection terminal, resulting in a lower luminous flux between them. However, disconnection may still occur at this time. To further improve the accuracy of leakage current monitoring of the battery, the step of detecting whether the luminous flux of the short-circuited positive electrode exceeds a preset luminous flux includes the following steps:

[0052] When the positive electrode short-circuit luminous flux is less than or equal to the preset luminous flux matching, the positive electrode short-circuit reflective illuminance of the battery is obtained;

[0053] The positive electrode short-circuit reflective illuminance and the preset reflective illuminance are subjected to short-illuminance fusion processing to obtain a short-illuminance compensation value;

[0054] Detect whether the short-shot compensation value is less than 0;

[0055] When the short-day compensation value is less than 0, a battery positive electrode oxidation signal is sent to the battery management and protection system.

[0056] In this embodiment, the light flux of the positive electrode short circuit being less than or equal to the preset light flux matching indicates that the light flux between the positive electrode of the battery and the detection end on the protection board is small, meaning the light transmission intensity between the positive electrode of the battery and the detection end on the protection board is low. However, this does not necessarily indicate a situation where the positive electrode of the battery and the detection end on the protection board are completely short-circuited without any metal oxide filling. To distinguish this situation, it is necessary to obtain the positive electrode short circuit reflective illuminance, which is the intensity of reflected light at the connection point between the positive electrode of the battery and the detection end on the protection board. In other words, the positive electrode short circuit reflective illuminance reflects the reflectivity at the connection point between the positive electrode of the battery and the detection end on the protection board. The preset reflective illuminance is the reflected brightness when the positive electrode of the battery is completely short-circuited with the detection terminal on the protection board. In other words, the preset reflective illuminance is the intensity of the metallic reflected light when the positive electrode of the battery is completely short-circuited with the detection terminal on the protection board, or the brightness of the light reflected by the metallic material of the positive electrode of the battery or the detection terminal on the protection board. Thus, the short-circuit reflective illuminance and the preset reflective illuminance are used for short-circuit compensation processing to obtain the light intensity difference of the reflected light at the connection point between the positive electrode of the battery and the detection terminal on the protection board. The short-light compensation value being less than 0 indicates that the light intensity difference between the reflected light at the connection point between the positive electrode of the battery and the detection terminal on the protection board is low. This means that the reflected light at the connection point between the positive electrode of the battery and the detection terminal on the protection board is light reflected from metal oxide, indicating the presence of metal oxide between the positive electrode of the battery and the detection terminal on the protection board. In this case, a positive electrode oxidation signal is sent to the battery management and protection system to determine that the positive electrode of the battery is currently in an uncleaned state. This avoids mistaking the current oxidation voltage output state of the positive electrode of the battery for an undervoltage state, effectively improving the accuracy of leakage current monitoring of the battery.

[0057] In one embodiment, this application also provides a battery leakage monitoring device, which is implemented using the battery leakage monitoring method described in any of the above embodiments. In one embodiment, the battery leakage monitoring device has functional modules for implementing the steps corresponding to each step of the battery leakage monitoring method. The battery leakage monitoring device includes a battery short-circuit acquisition unit and a battery leakage prevention mainboard; the battery short-circuit acquisition unit is used to acquire the leakage short-circuit signal of the battery; the input terminal of the battery leakage prevention mainboard is connected to the output terminal of the battery short-circuit acquisition unit, and the output terminal of the battery leakage prevention mainboard is used to connect to a battery management and protection system; the battery leakage prevention mainboard is used to perform signal-to-signal conversion processing on the leakage short-circuit signal and a preset short-circuit signal to obtain an electrical short differential component; and sends a battery start-up / shutdown signal to the battery management and protection system according to the electrical short differential component to adjust the battery's power output state.

[0058] In this embodiment, the battery short-circuit acquisition device detects the leakage short-circuit state of the battery to determine the current discharge capacity of the battery. The battery leakage protection mainboard compares the leakage short-circuit signal with the preset short-circuit signal to determine the degree of difference between the battery voltage and the normal voltage, thereby determining the undervoltage condition of the battery. Finally, based on the undervoltage degree reflected by the short-circuit differential component, the battery management and protection mainboard can control the current power output of the battery through the battery management and protection system, effectively reducing the probability of battery cell failure.

[0059] In one embodiment, this application also provides a battery leakage monitoring circuit employing the battery leakage monitoring method of any of the above embodiments.

[0060] Please see Figure 2 This is a circuit diagram of a battery leakage protection monitoring circuit according to an embodiment of the present invention.

[0061] One embodiment of a battery leakage protection monitoring circuit 10 includes a leakage protection circuit 100 and a monitoring output circuit 200. The leakage protection circuit 100 includes a first electronic switch Q1, a first resistor R1, a second resistor R3, a third resistor R4, and a fourth resistor R5. The first terminal of the first resistor R1 is connected to the positive terminal S3 of the battery, and the second terminal of the first resistor R1 is connected to the first terminal of the first electronic switch Q1. The first terminal of the second resistor R3 is connected to the supply voltage VCC, and the second terminal of the second resistor R3 is connected to the control terminal of the first electronic switch Q1. The second terminal of the second resistor R3 is also connected to the second terminal of the first electronic switch Q1 through the third resistor R4, and the second terminal of the first electronic switch Q1 is connected to a common terminal through the fourth resistor R5. Please refer to the following: Figure 3The supply voltage VCC is the voltage output by the battery through the battery management chip U9. The monitoring output circuit 200 includes a second electronic switch Q2 and a fifth resistor R2. The first end of the fifth resistor R2 is connected to the supply voltage VCC, and the first end of the fifth resistor R2 is connected to the first end of the second electronic switch Q2. The first end of the second electronic switch Q2 is connected to the battery leakage signal acquisition terminal ID of the battery management chip U9, the control terminal of the second electronic switch Q2 is connected to the second end of the first electronic switch Q1, and the second end of the second electronic switch Q2 is connected to a common terminal.

[0062] In this embodiment, when the battery has not been used for a long time and is restarted to supply power, the supply voltage VCC is too low, and the voltage applied across the third resistor R4 and the fourth resistor R5 is too small to turn on the first electronic switch Q1. This causes both the first electronic switch Q1 and the second electronic switch Q2 to be turned off, thereby interrupting the current path of the first resistor R1, the first electronic switch Q1, and the fourth resistor R5. Consequently, the battery cannot continue to supply power, effectively disconnecting the power supply between the battery and other electronic devices. This effectively prevents the battery from dying due to cell depletion and thus effectively improves the battery's lifespan.

[0063] In one embodiment, please refer to Figure 2 The leakage protection circuit 100 includes a first unidirectional diode D1. The positive terminal of the battery S3 is connected to the positive terminal of the first unidirectional diode D1, and the negative terminal of the first unidirectional diode D1 is connected to the first end of the first resistor R1. In this embodiment, the first unidirectional diode D1 is connected in series between the battery and the first resistor R1, that is, the first unidirectional diode D1 is connected in series with the first resistor R1. The first unidirectional diode D1 conducts unidirectionally to the positive terminal of the battery, ensuring the unidirectional current at the first end of the first electronic switch Q1, thereby ensuring that the first end of the first electronic switch Q1 receives the correct positive terminal voltage of the battery S3, and thus ensuring the accurate acquisition of the positive terminal voltage signal of the battery by the first electronic switch Q1.

[0064] In one embodiment, please refer to Figure 2The leakage protection circuit 100 includes a second unidirectional diode D2. The positive terminal of the second unidirectional diode D2 is connected to the power supply voltage VCC, and the negative terminal of the second unidirectional diode D2 is connected to the first end of the second resistor R3. In this embodiment, the second unidirectional diode D2 is connected in series between the battery management chip U9 and the second resistor R3, that is, the second unidirectional diode D2 and the second resistor R3 are connected in series. The second unidirectional diode D2 unidirectionally conducts the output of the battery management chip U9, that is, the second unidirectional diode D2 unidirectionally conducts the current output by the battery, ensuring the unidirectionality of the current at the control terminal of the first electronic switch Q1, thereby ensuring that the control terminal of the first electronic switch Q1 receives the correct power supply voltage VCC, and thus ensuring the accurate acquisition of the power supply voltage VCC signal output by the battery by the first electronic switch Q1.

[0065] In one embodiment, please refer to Figure 2 The first electronic switch Q1 and the second electronic switch Q2 are NPN transistors. In this embodiment, the first terminal of the first electronic switch Q1 and the first terminal of the second electronic switch Q2 are the collectors of the NPN transistors, the second terminals of the first electronic switch Q1 and the second electronic switch Q2 are the emitters of the NPN transistors, and the control terminals of the first electronic switch Q1 and the second electronic switch Q2 are the bases of the NPN transistors.

[0066] In another embodiment, the first electronic switch Q1 and the second electronic switch Q2 are N-type MOS transistors. The first terminal of the first electronic switch Q1 and the first terminal of the second electronic switch Q2 are the drains of the N-type MOS transistors, the second terminal of the first electronic switch Q1 and the second terminal of the second electronic switch Q2 are the sources of the N-type MOS transistors, and the control terminal of the first electronic switch Q1 and the control terminal of the second electronic switch Q2 are the gates of the N-type MOS transistors.

[0067] In one embodiment, this application also provides a battery leakage protection monitoring device, including the battery leakage protection monitoring circuit described in any of the above embodiments. In this embodiment, the battery leakage protection monitoring circuit includes a leakage protection circuit and a monitoring output circuit. The leakage protection circuit includes a first electronic switch, a first resistor, a second resistor, a third resistor, and a fourth resistor. A first terminal of the first resistor is connected to the positive terminal of the battery, and a second terminal of the first resistor is connected to a first terminal of the first electronic switch. A first terminal of the second resistor is connected to a supply voltage, and a second terminal of the second resistor is connected to a control terminal of the first electronic switch. The second terminal of the second resistor is also connected to a second terminal of the first electronic switch through the third resistor, and the second terminal of the first electronic switch is connected to a common terminal through the fourth resistor. The supply voltage is the voltage output by the battery through the battery management chip. The monitoring output circuit includes a second electronic switch and a fifth resistor. A first terminal of the fifth resistor is connected to the supply voltage, and a first terminal of the fifth resistor is connected to a first terminal of the second electronic switch. The first terminal of the second electronic switch is connected to the battery leakage signal acquisition terminal of the battery management chip. The control terminal of the second electronic switch is connected to the second terminal of the first electronic switch, and the second terminal of the second electronic switch is connected to a common terminal. When the battery has not been used for a long time and is restarted to supply power, the supply voltage is too low, and the voltage applied across the third and fourth resistors is too small to turn on the first electronic switch. This causes both the first and second electronic switches to be turned off, thereby interrupting the current path of the first resistor, the first electronic switch, and the fourth resistor. Consequently, the battery cannot continue to supply power, effectively disconnecting the power supply between the battery and other electronic devices. This effectively prevents the battery from dying due to cell depletion and thus effectively improves the battery's lifespan.

[0068] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this invention patent should be determined by the appended claims.

Claims

1. A battery leakage prevention monitoring method, characterized in that, include: Obtain the battery leakage short-circuit signal; The leakage current short-circuit signal and the preset short-circuit signal are subjected to signal value conversion processing to obtain the electrical short differential component; The battery start-up and shutdown signals are sent to the battery management and protection system according to the electrical short differential component to adjust the power output state of the battery. The process of obtaining the battery leakage short-circuit signal includes the following steps: Obtain the light flux of the positive electrode short-circuited in the battery; Detect whether the light flux of the positive electrode short circuit is greater than the preset light flux; When the positive electrode short-circuit luminous flux is greater than the preset luminous flux matching, a battery positive electrode disconnection signal is sent to the battery management and protection system.

2. The battery leakage prevention monitoring method according to claim 1, characterized in that, The step of performing signal value conversion processing on the leakage current short-circuit signal and the preset short-circuit signal to obtain the electrical short differential component includes: The battery short-circuit value is obtained based on the leakage short-circuit signal; Perform a short-circuit differential operation on the battery short-circuit value and the short-circuit value corresponding to the preset short-circuit signal to obtain the electrical short-circuit differential component.

3. The battery leakage prevention monitoring method according to claim 1, characterized in that, The step of sending a battery start-up / shutdown signal to the battery management and protection system based on the electrical short differential component to adjust the battery's power output state includes: Detect whether the electrical short differential component is greater than or equal to the first differential component; When the electrical short differential component is greater than or equal to the first differential component, a battery turn-on signal is sent to the battery management and protection system to close the battery terminal switch.

4. The battery leakage prevention monitoring method according to claim 3, characterized in that, The step of detecting whether the electrical short differential component is greater than or equal to the first differential component further includes: When the electrical short differential component is less than the first differential component, a battery shutdown signal is sent to the battery management and protection system to disconnect the battery terminal switch.

5. The battery leakage prevention monitoring method according to claim 4, characterized in that, When the electrical short differential component is less than the first differential component, sending a battery shutdown signal to the battery management and protection system to disconnect the battery terminal switch includes: When the electrical short differential component is less than the first differential component, it is detected whether the electrical short differential component matches the second differential component; When the electrical short differential component matches the second differential component, a first battery leakage protection status signal is sent to the battery management and protection system.

6. The battery leakage prevention monitoring method according to claim 5, characterized in that, The second difference component is smaller than the first difference component.

7. The battery leakage prevention monitoring method according to claim 5, characterized in that, The step of detecting whether the electrical short differential component matches the second differential component further includes: When the electrical short differential component does not match the second differential component, it is detected whether the electrical short differential component matches the third differential component. When the electrical short differential component matches the third differential component, a battery standby status signal is sent to the battery management and protection system.

8. The battery leakage prevention monitoring method according to claim 7, characterized in that, The step of detecting whether the electrical short differential component matches the third differential component further includes: When the electrical short difference component does not match the third difference component, it is detected whether the electrical short difference component matches the fourth difference component. When the electrical short differential component matches the fourth differential component, a second battery leakage protection status signal is sent to the battery management and protection system.

9. The battery leakage prevention monitoring method according to claim 8, characterized in that, The step of detecting whether the electrical short difference component matches the fourth difference component further includes: When the electrical short differential component does not match the fourth differential component, a battery power-on alarm signal is sent to the battery management and protection system.

10. A battery leakage prevention monitoring device, characterized in that, include: A battery short-circuit acquisition device is used to acquire the leakage short-circuit signal of the battery. A battery leakage protection main board, wherein the input terminal of the battery leakage protection main board is connected to the output terminal of the battery short-circuit collector, the output terminal of the battery leakage protection main board is used to connect to the battery management and protection system, and the battery leakage protection main board is used to perform signal value conversion processing on the leakage short-circuit signal and the preset short-circuit signal to obtain the electrical short differential component; The battery power output state of the battery is adjusted by sending a battery start-up / shutdown signal to the battery management and protection system based on the electrical short differential component.

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