Safety monitoring and early warning systems for lithium batteries and electric vehicles

Abstract

This utility model provides a safety monitoring and early warning system for lithium batteries and an electric vehicle. The system includes: a lithium battery module, a parameter acquisition module, a monitoring and early warning module, an information transmission module, and a protection and control module. The lithium battery module includes multiple individual cells. The parameter acquisition module is used to collect the operating parameter information of the individual cells, including the internal humidity of the battery. The monitoring and early warning module is used to calculate the pressure difference and temperature rise based on the operating parameter information. When the pressure difference, temperature rise, or internal humidity of the battery exceeds a 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 a set number, and the current of the individual cell is still monitored, the protection and control module is disconnected. This allows users to anticipate potential safety hazards caused by lithium batteries and prevent accidents and disasters in advance, achieving the effect of prevention before the event.

Description

Technical Field

[0001] This utility model relates to the field of electric vehicle technology, and in particular to a safety monitoring and early warning system for lithium batteries and electric vehicles. Background Technology

[0002] With the booming development of the electric vehicle industry, lithium battery safety accidents are also increasing. Currently, most lithium battery management systems on the market are passive protection systems, such as controlling the protection switch to shut off the lithium battery output when the voltage, current, or temperature reaches the set protection value.

[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 thermal runaway and cannot prevent the occurrence of accidents and disasters. Utility Model Content

[0004] In view of this, the purpose of this utility model is to provide a safety monitoring and early warning system for lithium batteries and electric vehicles, which can enable users to anticipate potential safety hazards of lithium batteries, prevent accidents and disasters in advance, and achieve the effect of preventing problems before they occur.

[0005] In a first aspect, this utility model 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 and 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 multiple individual batteries;

[0007] The parameter acquisition module is used to acquire the operating parameter information of the individual battery cell; wherein, the operating parameter information includes the humidity of the battery's internal environment;

[0008] The monitoring and early warning module is used to calculate the pressure difference and temperature rise based on the operating parameter information; when the pressure difference, the temperature rise, or the humidity of the battery's internal environment exceeds a set early warning threshold, an early warning message is generated; and the early warning message is sent to the user terminal through 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 cell is still detected, the protection control module is controlled to disconnect.

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

[0011] Furthermore, the parameter acquisition module includes an ambient temperature probe, an ambient humidity probe, and an individual 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 internal ambient humidity of the battery;

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

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

[0016] The MCU is configured to select the maximum and minimum values ​​from the single-string voltage; calculate the voltage difference based on the maximum and minimum values; select a first warning value from a first warning value set range; and generate a first warning message if the voltage difference is greater than the first warning value.

[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 temperature set; select a second warning value from the second warning value set range; and generate a second warning message if the temperature rise is greater than the second warning value.

[0018] Furthermore, the MCU is used to select a third warning value from the set range of the third warning value; if the humidity inside the battery is greater than the third warning value, then a third warning message is generated.

[0019] Furthermore, the first warning value is set within a range of 500mV to 1000mV, the second warning value is set within a range of 30K to 60K, and the third warning value is set within 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 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] Secondly, embodiments of this utility model provide an electric vehicle, including the safety monitoring and early warning system for lithium batteries as described above.

[0023] This utility model provides a lithium battery safety monitoring and early warning system and an electric vehicle. The system includes a lithium battery module, a parameter acquisition module, a monitoring and early warning module, an information transmission module, and a protection and control module. The parameter acquisition module, information transmission module, and protection and control module are respectively connected to the monitoring and early warning module, and the parameter acquisition module and protection and control module are respectively connected to the lithium battery module. The lithium battery module includes multiple individual cells. The parameter acquisition module is used to collect the operating parameter information of the individual cells, including the internal humidity of the battery. The monitoring and early warning module is used to calculate the pressure difference and temperature rise based on the operating parameter information. When the pressure difference, temperature rise, or internal humidity of the battery exceeds a 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 a set number, and the current of the individual cells is still monitored, the protection and control module is disconnected. This allows users to anticipate potential safety hazards from lithium batteries and prevent accidents and disasters in advance, achieving the effect of prevention before they occur.

[0024] Other features and advantages of this invention will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the invention. The objectives and other advantages of this invention are realized and obtained through the structures particularly pointed out in the description, claims, and drawings.

[0025] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0026] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0027] Figure 1 This is a schematic diagram of a lithium battery safety monitoring and early warning system provided in Embodiment 1 of this utility model;

[0028] Figure 2 This is a schematic diagram of the structure of a lithium battery safety monitoring and early warning system provided in Embodiment 1 of this utility model.

[0029] icon:

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

[0031] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0032] To facilitate understanding of this embodiment, the following is a detailed description of the embodiment of this utility model.

[0033] Example 1:

[0034] Figure 1 This is a schematic diagram of a lithium battery safety monitoring and early warning system provided in Embodiment 1 of this utility model.

[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 and 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 multiple individual batteries;

[0037] Parameter acquisition module 2 is used to acquire the operating parameter information of individual cells; among which, the operating parameter information includes the humidity of the internal environment of the battery;

[0038] The monitoring and early warning module 3 is used to calculate the pressure difference and temperature rise based on the working parameter information; when the pressure difference, temperature rise or humidity of the battery's internal environment exceeds the set early warning threshold, an early warning message is generated; and the early warning message is sent 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 a single battery cell is still being monitored, the control and protection module 5 disconnects.

[0040] Here, the number of times can be set to 3, and the charge-discharge cycle is 1. After sending three warning messages about potential lithium battery safety hazards to the user, if the system still detects the working current of a single battery cell, the charging protection switch and the discharging protection switch in the system control protection module will be disconnected, 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 a set warning threshold, a warning message is generated. When the number of times the warning message is pushed to the user terminal reaches a set number, and the current of a single battery cell is still being monitored, the control and protection module is disconnected. This allows users to be aware in advance of potential safety hazards in the lithium battery and to promptly terminate the use of the lithium battery in the early stages of such hazards. The incubation period between the initial occurrence of these safety hazards and the occurrence of thermal runaway in the lithium battery is often as long as six months 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 consists of multiple individual cells connected in series and parallel, i.e., one parallel and multiple series or multiple parallel and multiple series. For example, a cylindrical individual cell has an ampere capacity of 5A. Connecting six individual cells in parallel yields an ampere capacity of 30A. Then, every six parallel individual cells are connected in series.

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

[0044] Furthermore, refer to Figure 2 The parameter acquisition module 2 includes an ambient temperature probe, an ambient humidity probe, and an individual temperature probe.

[0045] An ambient temperature probe is used to collect the internal ambient temperature of the battery.

[0046] An ambient humidity probe is used to collect the humidity inside the battery.

[0047] A single cell temperature probe is used to collect the cell temperature on the surface of a single battery cell.

[0048] Specifically, in Figure 2 In the module, the parameter acquisition module has acquisition lines and acquisition components. Each line includes a fuse, an acquisition resistor, and a comparison resistor. Each line is connected in parallel. The term "n lines as above" means that the line 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 used to select the maximum and minimum values ​​from a single voltage string; calculate the voltage difference based on the maximum and minimum values; select a first warning value from a set range of first warning values; 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), an integrated protection circuit mainly used for signal acquisition, processing, and conversion, playing an important role in various electronic devices. The MCU is an information processing chip. The monitoring and early warning module 3 collects the operating parameter information of individual batteries and controls the opening and closing of the protection switch through protection threshold settings; it can also calculate pressure difference and temperature rise, predict potential safety hazards in lithium batteries based on pressure difference, temperature rise, and humidity, and issue early warning information for 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 communication lines, emitting alarm sounds through alarm speakers, and displaying alarm information through display devices.

[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; the warning information transmission module is used to send the warning information to the user terminal, reminding the user to terminate the use of the lithium battery in a timely manner. During transmission, wireless transmission devices, including but not limited to mobile communication networks, Bluetooth, and WiFi (Wireless Fidelity), are used.

[0053] Furthermore, the MCU calculates the temperature rise based on the battery's internal ambient temperature and the internal base environment set temperature; selects a second warning value from the second warning value set range; and generates a second warning message if the temperature rise exceeds the second warning value. The internal base environment set temperature ranges from 20℃ to 25℃. The internal base environment set temperature can be set to the above range, but is not limited to it; other ranges are also possible.

[0054] Furthermore, the MCU is used to select a third warning value from the set range of the third warning value; if the humidity inside the battery is greater than the third warning value, then a third warning message is generated.

[0055] Furthermore, the first warning value is set within a range of 500mV to 1000mV, the second warning value within a range of 30K to 60K, and the third warning value within a range of 75% to 95%. The first, second, and third warning value setting ranges can be set to the above ranges, but are not limited to these ranges; they 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 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] This utility model embodiment provides an electric vehicle, including a safety monitoring and early warning system for lithium batteries as described above.

[0059] This utility model provides a lithium battery safety monitoring and early warning system and an electric vehicle. The system includes a lithium battery module, a parameter acquisition module, a monitoring and early warning module, an information transmission module, and a protection and control module. The parameter acquisition module, information transmission module, and protection and control module are respectively connected to the monitoring and early warning module, and the parameter acquisition module and protection and control module are respectively connected to the lithium battery module. The lithium battery module includes multiple individual cells. The parameter acquisition module is used to collect the operating parameter information of the individual cells, including the internal humidity of the battery. The monitoring and early warning module is used to calculate the pressure difference and temperature rise based on the operating parameter information. When the pressure difference, temperature rise, or internal humidity of the battery exceeds a 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 a set number, and the current of the individual cells is still monitored, the protection and control module is disconnected. This allows users to anticipate potential safety hazards from lithium batteries and prevent accidents and disasters in advance, achieving the effect of prevention before they occur.

[0060] The computer program product provided in this embodiment 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 preceding method embodiments. For specific implementation details, please refer to the method embodiments, which will not be repeated here.

[0061] Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the specific working process of the system and apparatus described above can be referred to the corresponding process in the foregoing method embodiments, and will not be repeated here.

[0062] Furthermore, in the description of the embodiments of this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances.

[0063] If the aforementioned functions are implemented as 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 this utility model, essentially, or the part that contributes to the prior art, or a portion of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of this utility model. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0064] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. 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 merely specific implementations of this utility model, used to illustrate the technical solution of this utility model, and not to limit it. The protection scope of this utility model is not limited thereto. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that any person skilled in the art can still modify or easily conceive of changes to the technical solutions described in the foregoing embodiments, or make equivalent substitutions for some of the technical features, within the technical scope disclosed in this utility model. These modifications, changes, 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 covered within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the protection scope of the claims.

Claims

1. A safety monitoring and early warning system for lithium batteries, 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 and 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 multiple individual batteries; The parameter acquisition module is used to acquire the operating parameter information of the individual battery cell; wherein, the operating parameter information includes the humidity of the battery's internal environment; The monitoring and early warning module is used to calculate the pressure difference and temperature rise based on the operating parameter information; when the pressure difference, the temperature rise, or the humidity of the battery's internal environment exceeds a set early warning threshold, an early warning message is generated; and the early warning message is sent to the user terminal through 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 cell is still detected, the protection control module is controlled to disconnect.

2. The safety monitoring and warning system for lithium battery according to claim 1, characterized in that, The operating parameter information also includes single-string voltage, total voltage, total current, internal battery temperature, and cell surface temperature of individual cells.

3. The safety monitoring and warning system for lithium battery of claim 2, wherein, The parameter acquisition module includes an ambient temperature probe, an ambient humidity probe, and an individual 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 internal ambient humidity of the battery; The single-cell temperature probe is used to collect the cell temperature on the surface of the single-cell battery.

4. The safety monitoring and warning system for lithium battery of claim 2, wherein, The monitoring and early warning module includes an MCU; The MCU is configured to select the maximum and minimum values ​​from the single-string voltage; calculate the voltage difference based on the maximum and minimum values; select a first warning value from a first warning value set range; and generate a first warning message if the voltage difference is greater than the first warning value.

5. The safety monitoring and warning system for lithium battery of claim 4, wherein, The MCU is used to calculate the temperature rise based on the internal ambient temperature of the battery and the internal basic ambient temperature setting; select a second warning value from the second warning value setting range; and generate a second warning message if the temperature rise is greater than the second warning value.

6. The safety monitoring and warning system for lithium battery of claim 5, wherein, The MCU is used to select a third warning value from the set range of the third warning value; if the humidity inside the battery is greater than the third warning value, then a third warning message is generated.

7. The safety monitoring and warning system for lithium battery of claim 6, wherein, The first warning value is set within the range of 500mV to 1000mV, the second warning value is set within the range of 30K to 60K, and the third warning value is set within the range of 75% to 95%.

8. The safety monitoring and warning system for lithium battery of claim 1, wherein, The protection control module is connected to the positive output terminal of the lithium battery module, or to the negative output terminal of the lithium battery module.

9. The safety monitoring and warning system for lithium battery of claim 1, wherein, The protection control module includes a charging protection switch and a discharging protection switch.

10. An electric vehicle, characterized by The system includes the safety monitoring and early warning system for lithium batteries as described in any one of claims 1 to 9.

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