CN214590696U - Lithium battery protection system with alarm function - Google Patents
Lithium battery protection system with alarm function Download PDFInfo
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- CN214590696U CN214590696U CN202120748543.7U CN202120748543U CN214590696U CN 214590696 U CN214590696 U CN 214590696U CN 202120748543 U CN202120748543 U CN 202120748543U CN 214590696 U CN214590696 U CN 214590696U
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Abstract
The utility model discloses a lithium battery protection system with alarming function, including set up in the hydrogen sensor of lithium cell incasement and with hydrogen sensor signal connection's controller, the built-in BMS control module of controller, BMS control module is connected with alarm module, the module of charging and thermal management module. In this way, the utility model has the advantages of simple structure, detect the accuracy, through the hydrogen concentration that detects in the battery box, in time judge whether there is the risk of thermal runaway in lithium cell group, send alarm signal and in time cut off power supply, open thermal management module and cool down the processing to lithium cell group, in time handle before the thermal runaway takes place in lithium cell group, avoid the emergence of conflagration.
Description
Technical Field
The utility model relates to a lithium cell field especially relates to a lithium cell protection system with alarming function.
Background
With the development of the national new energy cause, the usage amount of the electric vehicle is increased year by year, and the safety problem of the lithium battery becomes important to people. Thermal runaway of lithium batteries generally proceeds through the processes of explosion-proof valve explosion, rapid temperature rise, and smoking and ignition. Before the lithium battery is out of control due to heat, the anode and cathode materials and the electrolyte react to generate a large amount of gas, and the gas mainly comprises carbon dioxide, carbon monoxide and hydrogen. The generation of a large amount of gas causes the internal pressure of the battery to be increased sharply, so that the explosion-proof valve is exploded, and the gas is sprayed out. The conventional battery management system sends out an alarm according to the rapid change of the voltage or the temperature before the battery thermal runaway, but when the vehicle is in a parking state or a network signal is in a bad state, the data volume of the voltage or the temperature change is small, and the alarm can be delayed; meanwhile, when the voltage or the temperature of the battery is changed rapidly, the time of thermal runaway from the battery is short, and the reaction time left for passengers is short.
The prior art discloses a lithium cell box fire alarm and protection system, includes: the fire alarm and protection device is provided with a container and is connected with at least one fire detector, wherein the fire detector is suitable for monitoring environmental data in the lithium battery box; after the environmental data in the lithium battery box exceeds the set threshold value, the fire alarm and protection device starts the container to extinguish the fire of the battery box.
Although the technology adopts the fire alarm and protection device to protect the lithium battery box, the type of the adopted gas sensor is not favorable for quick detection and judgment before the thermal runaway of the lithium battery, and the effect is far inferior to that of using hydrogen as detection gas; in addition, this kind of device only is provided with fire extinguishing agent, can only realize putting out a fire and handle, can not in time cut off the charging circuit to do the cooling to lithium cell group and handle, in time prevent lithium cell thermal runaway, avoid the emergence of conflagration.
Therefore, it is necessary to design a lithium battery protection system with a simple structure, which uses the hydrogen concentration variation as the prediction information and can cut off the power supply and cool down the lithium battery pack in time before thermal runaway occurs.
SUMMERY OF THE UTILITY MODEL
In order to overcome the problem, the utility model provides a lithium battery protection system with alarming function through the hydrogen concentration that detects the battery box, in time judges whether there is the risk of thermal runaway in lithium cell group to in time cut off power, open thermal management module and cool down the processing to lithium cell group, in time handle before the thermal runaway takes place in lithium cell group, avoid the emergence of conflagration.
In order to achieve the above object, the utility model adopts the following technical scheme:
the utility model provides a lithium battery protection system with alarming function, including set up in the hydrogen sensor of lithium cell incasement and with hydrogen sensor signal connection's controller, the built-in BMS control module of controller, BMS control module is connected with alarm module, charging module and thermal management module.
Furthermore, a plurality of lithium batteries formed by connecting a plurality of lithium batteries in series and in parallel are accommodated in the lithium battery box, and the plurality of lithium batteries are respectively connected with the BMS control module through signals of the sensing module.
Further, the sensing module comprises a voltage sensor and a temperature sensor.
Furthermore, the charging module and the thermal management module are respectively connected with the lithium battery pack, and the thermal management module comprises a cooling system for cooling the lithium battery pack.
Furthermore, the lithium battery pack is connected with an external load and a current sensor in series through a circuit module, and the current sensor is connected with the BMS control module through a communication protocol signal.
Further, the BMS control module receives monitoring signals transmitted by the voltage sensor, the current sensor and the temperature sensor, compares the monitoring signals with a preset threshold value, makes a judgment and sends a corresponding instruction; the preset threshold value comprises the maximum working voltage U of the lithium battery in a normal working statemaxMaximum operating current ImaxAnd maximum operating ambient temperature Tmax。
Furthermore, the alarm module comprises an alarm indicator light and a buzzer.
Further, the BMS control module is connected with a safety management module, and the safety management module is connected with the lithium battery pack.
Further, the BMS control module is connected with the vehicle-mounted monitoring system through a CAN bus.
Further, the BMS control module is connected with a communication interface, and the communication interface is set as an RS-232 interface.
Compared with the prior art, the beneficial effects of the utility model are that:
1. the utility model discloses a set up hydrogen sensor and BMS control module in the lithium cell box, because the content of hydrogen is almost zero in the air, detect the hydrogen that leaks before the lithium cell group takes place the thermal runaway, can be the fastest discovery lithium cell group whether have the trend of taking place the thermal runaway, and feed back to BMS control module, BMS control module and then the alarm module of control being connected with it reports to the police, the module that charges breaks off, charge and stop, the battery temperature rise slows down, thermal management module begins to work simultaneously, cool down to lithium cell group, can fall to minimum with the risk of lithium cell group thermal runaway, avoid the emergence of conflagration.
2. The utility model discloses a set up hydrogen sensor to detect out hydrogen as the sign before judging the thermal runaway emergence, for traditional voltage sensor and temperature sensor, because before the lithium cell thermal runaway, the gas concentration change is compared in voltage and temperature variation and will be earlier, adopts independent hydrogen sensor can discern the thermal runaway risk of lithium cell earlier. In addition, when the vehicle is in the parking state or the network state is not good, the data that BMS control module gathered are less, and the response of voltage or temperature variation easily delays, and hydrogen sensor independently exists, can directly judge according to whether detecting hydrogen, does not rely on data acquisition, can directly awaken BMS system and carry out action on next step.
3. The utility model discloses a all be provided with voltage sensor and temperature sensor on every lithium cell, can be when hydrogen sensor sends alarm signal, voltage sensor and temperature sensor detect the voltage and the temperature variation of lithium cell separately and feed back this signal to BMS control module, and BMS control module further confirms the lithium cell that has the risk of thermal runaway to in time handle it.
Drawings
Fig. 1 is a schematic diagram of the connection of the modules of the present invention;
fig. 2 is a schematic structural diagram of a lithium battery pack according to the present invention;
fig. 3 is a schematic structural diagram of the sensing module of the present invention;
the parts in the drawings are numbered as follows: 1. a BMS control module; 2. a hydrogen sensor; 3. a thermal management module; 4. a charging module; 5. an alarm module; 6. a communication interface; 7. a vehicle-mounted monitoring system; 8. a security management module; 9. a sensing module; 91. a voltage sensor; 92. a temperature sensor; 10. a lithium battery pack; 101. a lithium battery; 11. externally connecting a load; 12. and a current sensor.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the present invention will be described in detail with reference to the accompanying drawings and specific embodiments.
It should be noted that, in order to avoid obscuring the present invention with unnecessary details, only the structures and/or processing steps closely related to the aspects of the present invention are shown in the drawings, and other details not relevant to the present invention are omitted.
In addition, it is also to be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
Examples
As shown in fig. 1, a lithium battery protection system with an alarm function comprises a hydrogen sensor 2 arranged in a lithium battery box and a controller in signal connection with the hydrogen sensor 2, wherein a BMS control module 1 is arranged in the controller, and the BMS control module 1 is connected with an alarm module 5, a charging module 4 and a thermal management module 3. So set up, because the content of hydrogen is almost zero in the air, detect the hydrogen that leaks before lithium cell group 10 takes place the thermal runaway through hydrogen sensor 2, can be the fastest discovery lithium cell group 10 whether have the trend of taking place the thermal runaway, and feed back to BMS control module 1, BMS control module 1 and then control alarm module 5 reports to the police, the disconnection of control charging module 4, lithium cell group 10 stops to charge, the battery temperature rise slows down, the work of thermal management module 3 of while control, cool down lithium cell group 10. Thereby minimizing the risk of thermal runaway of the lithium battery pack 10 and avoiding the occurrence of fire.
In particular, since the gas concentration changes earlier than the voltage and temperature changes before the thermal runaway of the lithium battery 101, the risk of the thermal runaway of the lithium battery 101 can be identified earlier using the independent hydrogen sensor 2. And for voltage sensor 91 and temperature sensor 92, when the vehicle is in the parking state or the network state is not good, BMS control module 1 gathers data less, and the response of voltage or temperature change is easy to delay, and hydrogen sensor 2 independently exists, can directly judge according to whether detecting hydrogen, does not rely on data acquisition, can directly awaken BMS control module 1 and carry out the action of next step.
As shown in fig. 2 and 3, in some embodiments, a lithium battery pack 10 formed by connecting a plurality of lithium batteries 101 in series and in parallel is accommodated in the lithium battery pack, and the plurality of lithium batteries 101 are respectively in signal connection with the BMS control module 1 through a sensing module 9. The sensing module 9 includes a voltage sensor 91 and a temperature sensor 92 to detect the voltage and temperature variation of each lithium battery 101 and feed back to the BMS control module 1.
The lithium battery pack 10 is connected in series with an external load 11 and a current sensor 12 through a circuit module. The current sensor 12 is connected to the BMS control module 1 through a communication protocol signal to detect a current change of the lithium battery 101 and feed back the current change to the BMS control module 1.
Specifically, the BMS control module 1 receives the monitoring signals transmitted by the voltage sensor 91, the current sensor 12, and the temperature sensor 92, compares the monitoring signals with a preset threshold value, makes a judgment, and issues a corresponding instruction. The preset threshold value comprises the maximum working voltage U of the lithium battery 101 in a normal working statemaxMaximum operating current ImaxAnd maximum operating ambient temperature Tmax。
So set up, when hydrogen sensor 2 sent alarm signal, current sensor 12, voltage sensor 91 and temperature sensor 92 detected the current, voltage and the temperature variation of each lithium cell 101 to respectively transmit operating current I, operating voltage U and operational environment temperature T of each lithium cell 101 to BMS control module 1. The BMS control module 1 respectively corresponds the working current I, the working voltage U and the working environment temperature T to the maximum working current ImaxMaximum operating voltage UmaxAnd maximum operating ambient temperature TmaxAnd comparing, and the BMS control module 1 further determines the lithium battery 101 with the thermal runaway risk according to the comparison result of the three and timely processes the lithium battery.
As shown in fig. 1, in some embodiments, the charging module 4 and the thermal management module 3 are respectively connected to the lithium battery pack 10, and the thermal management module 3 includes a cooling system for cooling the lithium battery pack 10. The cooling system may be a cooling water circulation system, an air cooling system, or a condenser cooling system, and it should be noted that the cooling system may also be other systems having a cooling function, and is not particularly limited thereto.
As shown in fig. 1, in some embodiments, the BMS control module 1 is connected with a safety management module 8, and the safety management module 8 is connected with the lithium battery pack 10. The safety management module 8 is configured to collect data information of each lithium battery 101 and determine whether the lithium battery 101 is safe and reliable.
The BMS control module 1 is connected with a vehicle-mounted monitoring system 7 through a CAN bus. And the vehicle-mounted monitoring system 7 collects, monitors and dispatches various information of the device through the CAN bus.
The BMS control module 1 is connected with a communication interface 6, and the communication interface 6 is preferably an RS-232 interface so as to exchange information with the outside and be convenient to use.
In this way, when the hydrogen sensor 2 detects that a large amount of hydrogen appears in the lithium battery box, an alarm signal is sent to the BMS control module 1. The BMS control module 1 controls the alarm indicator lamp to flash and the buzzer to sound; the BMS control module 1 controls the charging module 4 to be disconnected, the lithium battery pack 10 stops charging, the temperature rise of the battery is slowed down, the heat management module 3 is controlled to work, and the cooling system starts to cool the lithium battery pack 10. Meanwhile, the current sensor 12, the voltage sensor 91 and the temperature sensor 92 respectively feed the current, the voltage and the temperature change of each lithium battery 101 back to the BMS control module 1, and the BMS control module 1 compares various information with preset threshold values, so as to determine the lithium battery 101 with a thermal runaway risk, so as to intensively cool the lithium battery and mark the lithium battery for subsequent replacement. When the signals fed back by the current sensor 12, the voltage sensor 91 and the temperature sensor 92 are normal, the BMS control module 1 controls the cooling system to stop working, and the user replaces the marked lithium battery 101 in time.
The above description is only intended to illustrate the technical solution of the present invention, and not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; all the equivalent structures or equivalent flow changes made by the contents of the specification and the drawings of the utility model, or the direct or indirect application in other related technical fields, are included in the patent protection scope of the utility model.
Claims (10)
1. The lithium battery protection system with the alarm function is characterized by comprising a hydrogen sensor (2) arranged in a lithium battery box and a controller in signal connection with the hydrogen sensor (2), wherein a BMS control module (1) is arranged in the controller, and the BMS control module (1) is connected with an alarm module (5), a charging module (4) and a thermal management module (3).
2. The lithium battery protection system with the alarm function according to claim 1, wherein a lithium battery pack (10) formed by connecting a plurality of lithium batteries (101) in series and in parallel is accommodated in the lithium battery box, and the plurality of lithium batteries (101) are respectively in signal connection with the BMS control module (1) through a sensing module (9).
3. The lithium battery protection system with alarm function according to claim 2, characterized in that the sensing module (9) comprises a voltage sensor (91) and a temperature sensor (92).
4. The lithium battery protection system with the alarm function according to claim 2, wherein the charging module (4) and the thermal management module (3) are respectively connected to the lithium battery pack (10), and the thermal management module (3) comprises a cooling system for cooling the lithium battery pack (10).
5. The lithium battery protection system with the alarm function according to claim 3, wherein the lithium battery pack (10) is connected in series with an external load (11) and a current sensor (12) through a circuit module, and the current sensor (12) is in signal connection with the BMS control module (1) through a communication protocol.
6. The lithium battery protection system with the alarm function according to claim 5, wherein the BMS control module (1) receives monitoring signals transmitted by the voltage sensor (91), the current sensor (12) and the temperature sensor (92), compares the monitoring signals with a preset threshold value, makes a judgment and sends a corresponding instruction; the preset threshold value comprises the maximum working voltage U of the lithium battery (101) in a normal working statemaxMaximum operating current ImaxAnd maximum operating ambient temperature Tmax。
7. The lithium battery protection system with alarm function as claimed in claim 1, wherein the alarm module (5) comprises an alarm indicator lamp and a buzzer.
8. The lithium battery protection system with alarm function according to claim 2, wherein a safety management module (8) is connected to the BMS control module (1), and the safety management module (8) is connected to the lithium battery pack (10).
9. The lithium battery protection system with alarm function according to claim 1, wherein the BMS control module (1) is connected with an on-board monitoring system (7) through a CAN bus.
10. The lithium battery protection system with the alarm function according to claim 1, wherein the BMS control module (1) is connected with a communication interface (6), and the communication interface (6) is configured as an RS-232 interface.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120748543.7U CN214590696U (en) | 2021-04-13 | 2021-04-13 | Lithium battery protection system with alarm function |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120748543.7U CN214590696U (en) | 2021-04-13 | 2021-04-13 | Lithium battery protection system with alarm function |
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| Publication Number | Publication Date |
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| CN214590696U true CN214590696U (en) | 2021-11-02 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202120748543.7U Active CN214590696U (en) | 2021-04-13 | 2021-04-13 | Lithium battery protection system with alarm function |
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- 2021-04-13 CN CN202120748543.7U patent/CN214590696U/en active Active
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