Safety monitoring and early warning system of lithium battery and electric vehicle

Abstract

The invention provides a safety monitoring and early warning system of a lithium battery and an electric vehicle. The system comprises a lithium battery module, a parameter acquisition module, a monitoring and early warning module, an information transmission module and a protection control module, the lithium battery module comprises a plurality of single batteries; the parameter acquisition module is used for acquiring working parameter information of the single batteries; wherein the working parameter information comprises the internal environment humidity of the battery; the monitoring and early warning module is used for calculating pressure difference and temperature rise according to the working parameter information; when the pressure difference, the temperature rise or the internal environment humidity of the battery exceeds a set early warning threshold value, early warning information is generated; the early warning information is sent to a user terminal through an information transmission module; when the number of times of pushing the early warning information to the user terminal reaches a set number of times and the current of the single battery is still monitored, the protection control module is controlled to be disconnected; a user can foresee potential safety hazards generated by the lithium battery in advance, accidents and disasters are prevented in advance, and the effect of nipping in advance is achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of electric vehicles, and in particular to a safety monitoring and early warning system for lithium batteries and an electric vehicle. Background Art

[0002] At present, most lithium battery management systems on the market are passive protection. For example, when the collected voltage, current, and temperature reach the set protection values, the protection switch is controlled to shut down the lithium battery output.

[0003] In the above scheme, when the lithium battery experiences thermal runaway due to overvoltage or lithium plating short circuit, shutting off the output cannot stop the continuation of thermal runaway and cannot prevent the occurrence of accidents and disasters. Summary of the Invention

[0004] In view of this, the purpose of the present invention is to provide a lithium battery safety monitoring and early warning system and an electric vehicle, which can allow users to predict the safety hazards caused by lithium batteries in advance, prevent accidents and disasters from happening in advance, and achieve the effect of preventing problems before they occur.

[0005] In a first aspect, an embodiment of the present invention provides a safety monitoring and early warning system for lithium batteries, the system comprising: a lithium battery module, a parameter acquisition module, a monitoring and early warning module, an information transmission module, and a protection control module;

[0006] The parameter acquisition module, the information transmission module and the protection control module are respectively connected to the monitoring and early warning module, and the parameter acquisition module and the protection control module are respectively connected to the lithium battery module; wherein the lithium battery module includes a plurality of single cells;

[0007] The parameter acquisition module is used to acquire the operating parameter information of the single battery; wherein the operating parameter information includes the internal environmental humidity of the battery;

[0008] The monitoring and warning module is configured to calculate the pressure difference and temperature rise based on the operating parameter information; generate a warning message when the pressure difference, the temperature rise, or the humidity inside the battery exceeds a set warning threshold; and send the warning message to the user terminal via the information transmission module;

[0009] When the number of times the warning information is pushed to the user terminal reaches a set number and the current of the single battery is still monitored, the protection control module is controlled to be disconnected.

[0010] Furthermore, the operating parameter information also includes single string voltage, total voltage, total current, internal ambient temperature of the battery and cell temperature on the surface of the single battery.

[0011] Furthermore, the parameter acquisition module includes an ambient temperature probe, an ambient humidity probe and a single temperature probe;

[0012] The ambient temperature probe is used to collect the internal ambient temperature of the battery;

[0013] The ambient humidity probe is used to collect the ambient humidity inside the battery;

[0014] The single cell temperature probe is used to collect the cell temperature on the surface of the single cell.

[0015] Furthermore, the monitoring and early warning module includes an MCU;

[0016] The MCU is used to select the maximum value and the minimum value from the single string voltage; calculate the voltage difference based on the maximum value and the minimum value; select the first warning value from the first warning value setting range; if the voltage difference is greater than the first warning value, generate a first warning information.

[0017] Furthermore, the MCU is used to calculate the temperature rise based on the internal ambient temperature of the battery and the internal basic ambient setting temperature; select a second warning value from a second warning value setting range; and generate a second warning information if the temperature rise is greater than the second warning value.

[0018] Furthermore, the MCU is configured to select a third warning value from a third warning value setting range; and generate third warning information if the humidity of the internal environment of the battery is greater than the third warning value.

[0019] Furthermore, the first warning value is set in a range of 500mV to 1000mV, the second warning value is set in a range of 30K to 60K, and the third warning value is set in a range of 75% to 95%.

[0020] Furthermore, the protection control module is connected to the positive output terminal of the lithium battery module, or is connected to the negative output terminal of the lithium battery module.

[0021] Furthermore, the protection control module includes a charging protection switch and a discharging protection switch.

[0022] In a second aspect, an embodiment of the present invention provides an electric vehicle, including the safety monitoring and early warning system for the lithium battery as described above.

[0023] An embodiment of the present invention provides a safety monitoring and early warning system for lithium batteries and an electric vehicle, the system comprising: a lithium battery module, a parameter acquisition module, a monitoring and early warning module, an information transmission module and a protection control module; the parameter acquisition module, the information transmission module and the protection control module are respectively connected to the monitoring and early warning module, and the parameter acquisition module and the protection control module are respectively connected to the lithium battery module; wherein, the lithium battery module comprises a plurality of single cells; the parameter acquisition module is used to collect the working parameter information of the single cells; wherein, the working parameter information includes the internal environmental humidity of the battery; the monitoring and early warning module is used to calculate the pressure difference and temperature rise based on the working parameter information; when the pressure difference, temperature rise or internal environmental humidity of the battery exceeds the set early warning threshold, an early warning message is generated; the early warning message is sent to the user terminal through the information transmission module; when the number of times the early warning message is pushed to the user terminal reaches the set number and the current of the single cell is still monitored, the protection control module is controlled to disconnect; the user can be informed of the safety hazards caused by the lithium battery in advance, prevent the occurrence of accidents and disasters in advance, and achieve the effect of preventing problems before they occur.

[0024] Other features and advantages of the present invention will be described in the following description, and in part will become apparent from the description, or understood by practicing the present invention. The purposes and other advantages of the present invention are realized and obtained by the structures particularly pointed out in the description, claims and drawings.

[0025] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, preferred embodiments are given below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the specific embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0027] Figure 1 Schematic diagram of a lithium battery safety monitoring and early warning system provided in Example 1 of the present invention;

[0028] Figure 2 This is a schematic structural diagram of a lithium battery safety monitoring and early warning system provided in Example 1 of the present invention.

[0029] icon:

[0030] 1-Lithium battery module; 2-Parameter acquisition module; 3-Monitoring and early warning module; 4-Information transmission module; 5-Protection control module. DETAILED DESCRIPTION

[0031] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of them. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0032] To facilitate understanding of this embodiment, the embodiment of the present invention is described in detail below.

[0033] Example 1:

[0034] Figure 1 Schematic diagram of a lithium battery safety monitoring and early warning system provided in Example 1 of the present invention.

[0035] Reference Figure 1 The system includes: a lithium battery module 1, a parameter acquisition module 2, a monitoring and early warning module 3, an information transmission module 4 and a protection control module 5;

[0036] The parameter acquisition module 2, the information transmission module 4 and the protection control module 5 are respectively connected to the monitoring and early warning module 3, and the parameter acquisition module 2 and the protection control module 5 are respectively connected to the lithium battery module 1; wherein the lithium battery module 1 includes a plurality of single cells;

[0037] Parameter acquisition module 2, used to collect operating parameter information of single cells; wherein the operating parameter information includes the internal environmental humidity of the battery;

[0038] Monitoring and warning module 3, used to calculate the pressure difference and temperature rise based on the operating parameter information; generate a warning message when the pressure difference, temperature rise or internal humidity of the battery exceeds the set warning threshold; and send the warning message to the user terminal through the information transmission module 4;

[0039] When the number of times the warning information is pushed to the user terminal reaches the set number and the current of the single battery is still monitored, the protection control module 5 is controlled to be disconnected.

[0040] Here, the setting number can be 3 times, and the charge and discharge cycle is 1 time; after pushing three warning messages of lithium battery safety hazards to the user, if the system still monitors the working current of the single battery, the system controls the charging protection switch and the discharge protection switch in the protection control module to disconnect, thereby further protecting the personal and property safety of the people.

[0041] In this embodiment, when the pressure difference, temperature rise or internal humidity of the battery exceeds the set warning threshold, a warning message is generated; when the number of times the warning message is pushed to the user terminal reaches the set number and the current of the single battery is still monitored, the control protection control module is disconnected; this allows users to predict in advance that the lithium battery has a safety hazard and terminate the use of the lithium battery in time at the early stage of the safety hazard. The incubation period of these safety hazards from the early stage of their occurrence to the occurrence of thermal runaway of the lithium battery is often as long as half a year to a year; through the lithium battery safety monitoring and early warning system, accidents and disasters can be prevented in advance, achieving the effect of preventing problems before they occur.

[0042] Specifically, a lithium battery module includes multiple cells connected in series and parallel, which is called one parallel multiple strings or multiple parallel multiple strings. For example, a cylindrical cell has a 5A rating. Six cells connected in parallel give a 30A rating. Each six cells connected in parallel are then connected in series.

[0043] Furthermore, the operating parameter information also includes single string voltage, total voltage, total current, battery internal ambient temperature and cell temperature on the surface of the single battery.

[0044] Further, refer to Figure 2 , the parameter acquisition module 2 includes an ambient temperature probe, an ambient humidity probe and a single temperature probe;

[0045] Ambient temperature probe, used to collect the internal ambient temperature of the battery;

[0046] Ambient humidity probe, used to collect the internal humidity of the battery;

[0047] Single cell temperature probe, used to collect the cell temperature on the surface of single cell.

[0048] Specifically, in Figure 2 In the embodiment, the parameter acquisition module has acquisition circuits and acquisition components. Each circuit includes a fuse, an acquisition resistor and a comparison resistor. Each circuit is connected in parallel. Here, n circuits are the same as above, which means that the circuit also includes a fuse, an acquisition resistor and a comparison resistor.

[0049] Furthermore, the monitoring and early warning module 3 includes an MCU (Microcontroller Unit);

[0050] The MCU is configured to select a maximum value and a minimum value from a single string voltage; calculate a voltage difference based on the maximum value and the minimum value; select a first warning value from a first warning value setting range; and generate a first warning message if the voltage difference is greater than the first warning value.

[0051] Specifically, the monitoring and early warning module 3 also includes an AFE (Analog Front End, analog front-end chip). AFE is an integrated protection circuit mainly used for signal acquisition, processing and conversion, and plays an important role in various electronic devices. MCU is an information processing chip. The monitoring and early warning module 3 collects the working parameter information of the single battery and controls the opening and closing of the protection switch through the protection threshold setting; it can also calculate the pressure difference and temperature rise, predict the safety hazards of the lithium battery through the pressure difference, temperature rise and humidity, and issue early warning information of safety hazards such as excessive pressure difference, excessive temperature rise, and water ingress into the battery; the early warning information is transmitted through the information transmission module 4; wherein, the information transmission module 4 includes but is not limited to sending message information through the communication line, sending alarm sounds through the alarm speaker, and displaying the alarm information through the display device.

[0052] Furthermore, the information transmission module 4 includes a warning information display module and a warning information transmission module. The warning information display module is used to display warning information, and the warning information transmission module is used to send the warning information to the user terminal to remind the user to stop using the lithium battery in a timely manner. The transmission process includes but is not limited to wireless transmission devices such as mobile communication networks, Bluetooth, and WiFi (Wireless Fidelity).

[0053] Furthermore, the MCU is configured to calculate the temperature rise based on the battery's internal ambient temperature and the internal basic ambient temperature setting; select a second warning value from a second warning value setting range; and generate a second warning message if the temperature rise exceeds the second warning value. The internal basic ambient temperature setting range is 20°C-25°C, and the internal basic ambient temperature setting range is within the above range. The internal basic ambient temperature setting range can be set to the above range, but is not limited to the above range and can also be set to other ranges.

[0054] Furthermore, the MCU is configured to select a third warning value from a third warning value setting range; and generate a third warning message if the humidity of the internal environment of the battery is greater than the third warning value.

[0055] Furthermore, the first warning value setting range is 500mV to 1000mV, the second warning value setting range is 30K to 60K, and the third warning value setting range is 75% to 95%. The first warning value setting range, the second warning value setting range, and the third warning value setting range can be set to the above ranges, but are not limited to the above ranges and can also be set to other ranges.

[0056] Furthermore, the protection control module 5 is connected to the positive output terminal (B+) of the lithium battery module 1 , or is connected to the negative output terminal (B−) of the lithium battery module 1 .

[0057] Furthermore, the protection control module 5 includes a charging protection switch and a discharging protection switch.

[0058] An embodiment of the present invention provides an electric vehicle, including the safety monitoring and early warning system for the lithium battery as described above.

[0059] An embodiment of the present invention provides a safety monitoring and early warning system for lithium batteries and an electric vehicle, the system comprising: a lithium battery module, a parameter acquisition module, a monitoring and early warning module, an information transmission module and a protection control module; the parameter acquisition module, the information transmission module and the protection control module are respectively connected to the monitoring and early warning module, and the parameter acquisition module and the protection control module are respectively connected to the lithium battery module; wherein, the lithium battery module comprises a plurality of single cells; the parameter acquisition module is used to collect the working parameter information of the single cells; wherein, the working parameter information includes the internal environmental humidity of the battery; the monitoring and early warning module is used to calculate the pressure difference and temperature rise based on the working parameter information; when the pressure difference, temperature rise or internal environmental humidity of the battery exceeds the set early warning threshold, an early warning message is generated; the early warning message is sent to the user terminal through the information transmission module; when the number of times the early warning message is pushed to the user terminal reaches the set number and the current of the single cell is still monitored, the protection control module is controlled to disconnect; the user can be informed of the safety hazards caused by the lithium battery in advance, prevent the occurrence of accidents and disasters in advance, and achieve the effect of preventing problems before they occur.

[0060] The computer program product provided in the embodiments of the present invention includes a computer-readable storage medium storing program code. The instructions included in the program code can be used to execute the methods described in the previous method embodiments. For specific implementation, please refer to the method embodiments and will not be repeated here.

[0061] Those skilled in the art will clearly understand that, for the convenience and brevity of description, the specific working processes of the above-described systems and devices can refer to the corresponding processes in the aforementioned method embodiments and will not be repeated here.

[0062] In addition, in the description of the embodiments of the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; they may refer to mechanical connections or electrical connections; they may refer to direct connections or indirect connections through an intermediate medium; and they may refer to internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0063] If the functions are implemented in the form of software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, or the part that contributes to the prior art, or the part of the technical solution, can be embodied in the form of a software product. The computer software product is stored in a storage medium and includes several instructions for enabling a computer device (which can be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the method described in each embodiment of the present invention. The aforementioned storage medium includes various media that can store program codes, such as a USB flash drive, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk.

[0064] In the description of the present invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate and simplify the description of the present invention. They are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation, and therefore should not be construed as limitations on the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0065] Finally, it should be noted that the above-described embodiments are only specific implementations of the present invention, which are used to illustrate the technical solutions of the present invention, rather than to limit them. The scope of protection of the present invention is not limited thereto. Although the present invention has been described in detail with reference to the above-described embodiments, those skilled in the art should understand that any person skilled in the art can modify or easily conceive of changes to the technical solutions described in the above-described embodiments within the technical scope disclosed by the present invention, or replace some of the technical features therein with equivalents. Such modifications, changes, or replacements do not deviate from the spirit and scope of the technical solutions of the embodiments of the present invention, and should be included in the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be based on the scope of protection of the claims.

Claims

1. A lithium battery safety monitoring and early warning system, characterized in that: The system includes: a lithium battery module, a parameter acquisition module, a monitoring and early warning module, an information transmission module and a protection control module; The parameter acquisition module, the information transmission module and the protection control module are respectively connected to the monitoring and early warning module, and the parameter acquisition module and the protection control module are respectively connected to the lithium battery module; wherein the lithium battery module includes a plurality of single cells; The parameter acquisition module is used to acquire the operating parameter information of the single battery; wherein the operating parameter information includes the internal environmental humidity of the battery; The monitoring and warning module is configured to calculate the pressure difference and temperature rise based on the operating parameter information; generate a warning message when the pressure difference, the temperature rise, or the humidity inside the battery exceeds a set warning threshold; and send the warning message to the user terminal via the information transmission module; When the number of times the warning information is pushed to the user terminal reaches a set number and the current of the single battery is still monitored, the protection control module is controlled to be disconnected.

2. The lithium battery safety monitoring and early warning system according to claim 1, characterized in that: The operating parameter information also includes single string voltage, total voltage, total current, battery internal ambient temperature and battery cell temperature on the surface of the single battery.

3. The lithium battery safety monitoring and early warning system according to claim 2, characterized in that: The parameter acquisition module includes an ambient temperature probe, an ambient humidity probe and a single temperature probe; The ambient temperature probe is used to collect the internal ambient temperature of the battery; The ambient humidity probe is used to collect the ambient humidity inside the battery; The single cell temperature probe is used to collect the cell temperature on the surface of the single cell.

4. The lithium battery safety monitoring and early warning system according to claim 2, characterized in that: The monitoring and early warning module includes an MCU; The MCU is used to select the maximum value and the minimum value from the single string voltage; calculate the voltage difference based on the maximum value and the minimum value; select the first warning value from the first warning value setting range; if the voltage difference is greater than the first warning value, generate a first warning information.

5. The lithium battery safety monitoring and early warning system according to claim 4, characterized in that: The MCU is configured to calculate the temperature rise based on the internal ambient temperature of the battery and the internal basic ambient setting temperature; select a second warning value from a second warning value setting range; and generate a second warning message if the temperature rise is greater than the second warning value.

6. The lithium battery safety monitoring and early warning system according to claim 5, characterized in that: The MCU is configured to select a third warning value from a third warning value setting range; and generate third warning information if the humidity of the internal environment of the battery is greater than the third warning value.

7. The lithium battery safety monitoring and early warning system according to claim 6, characterized in that: The first warning value setting range is 500mV to 1000mV, the second warning value setting range is 30K to 60K, and the third warning value setting range is 75% to 95%.

8. The lithium battery safety monitoring and early warning system according to claim 1, characterized in that: The protection control module is connected to the positive output terminal of the lithium battery module, or is connected to the negative output terminal of the lithium battery module.

9. The lithium battery safety monitoring and early warning system according to claim 1, characterized in that: The protection control module includes a charging protection switch and a discharging protection switch.

10. An electric vehicle, characterized in that: A safety monitoring and early warning system for lithium batteries comprising the lithium battery according to any one of claims 1 to 9.

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