Lithium Battery Temperature Monitoring System and Method

Abstract

The present invention belongs to the technical field of lithium batteries, and discloses a lithium battery temperature monitoring system and method. The monitoring system includes: a plurality of battery clusters composed of a plurality of lithium batteries, and each battery cluster is provided with a battery management module and a temperature sensing cable monitoring module for monitoring the temperature state of the lithium batteries; the temperature sensing cable detection module includes a temperature sensing cable, a signal processing unit and a terminal resistor respectively connected to both ends of the temperature sensing cable; the temperature sensing cable is attached to the surface of the explosion-proof valve of the lithium battery cell for real-time monitoring of the temperature of the lithium battery cell; the terminal resistor is used to connect the steel core conductor in the temperature sensing cable so that the signal processing unit, the temperature sensing cable and the terminal resistor form a closed loop of the temperature sensing cable; the signal processing unit is used to monitor the closed loop of the temperature sensing cable in real time and determine whether to send an alarm message according to the monitoring result. The monitoring system of the present invention effectively reduces the risk of software errors during lithium battery temperature monitoring and saves production costs.

Description

Technical Field

[0001] The present invention belongs to the technical field of lithium batteries, and particularly relates to a lithium battery temperature monitoring system and method. Background Art

[0002] Existing lithium battery temperature monitoring systems usually use a Battery Management System (BMS) to monitor the temperature of lithium batteries. In the actual application of lithium batteries in electric ships or hybrid ships, it is also required to design a temperature monitoring system or voltage monitoring system independent of the BMS system to monitor the core temperature of lithium batteries, so as to prevent the original BMS system from failing and being unable to monitor the lithium batteries.

[0003] In view of this, in the prior art, a dual BMS system is used to monitor the core temperature of lithium batteries. When one BMS system fails and is unable to monitor the lithium batteries, the other BMS system can play a role. However, the BMS system usually runs software code on a hardware basis, and there are potential risks such as software freezing or program runaway.

[0004] Therefore, how to propose a lithium battery temperature monitoring system that can reduce the risk of software errors is an urgent technical problem to be solved. Summary of the Invention

[0005] In order to solve the technical problem that there is a risk of software errors when the existing BMS system monitors the temperature of lithium batteries, the present invention provides a lithium battery temperature monitoring system and method.

[0006] In a first aspect, the present invention provides a lithium battery temperature monitoring system, including: a plurality of battery clusters composed of a plurality of lithium batteries, and each battery cluster is provided with a battery management module and a temperature-sensitive cable monitoring module for monitoring the temperature state of the lithium batteries;

[0007] The temperature-sensitive cable detection module includes a temperature-sensitive cable, a signal processing unit and a terminal resistor respectively connected to both ends of the temperature-sensitive cable;

[0008] The temperature-sensitive cable is attached to the surface of the explosion-proof valve of the core of the lithium battery for real-time monitoring of the core temperature of the lithium battery;

[0009] The terminal resistor is used to connect the steel core conductor in the temperature-sensitive cable, so that the signal processing unit, the temperature-sensitive cable and the terminal resistor form a temperature-sensitive cable closed loop;

[0010] The signal processing unit is used to monitor the temperature-sensitive cable closed loop in real time and determine whether to send an alarm message according to the monitoring result.

[0011] Preferably, the monitoring result is the resistance value formed by the closed loop of the temperature-sensing cable;

[0012] When the monitored resistance value is less than the preset resistance alarm threshold, the signal processing unit issues an alarm message.

[0013] Preferably, the temperature-sensing cable monitoring module includes a first relay and a second relay, and the battery management module includes a third relay and a fourth relay;

[0014] The first relay is respectively connected to the third relay and the signal processing unit, and the second relay is respectively connected to the fourth relay and the signal processing unit.

[0015] Preferably, the first relay includes a positive power supply terminal of the first relay control line and a negative power supply terminal of the first relay control line, the third relay includes a first control signal unit and a first pin unit, and the signal processing unit includes a second control signal unit;

[0016] The positive power supply terminal of the first relay control line is connected to the first control signal unit, and the negative power supply terminal of the first relay control line is respectively connected to the first pin unit and the second control signal unit.

[0017] Preferably, the second relay includes a positive power supply terminal of the second relay control line and a negative power supply terminal of the second relay control line, the fourth relay includes a third control signal unit and a second pin unit, and the signal processing unit further includes a fourth control signal unit;

[0018] The positive power supply terminal of the second relay control line is connected to the third control signal unit, and the negative power supply terminal of the second relay control line is respectively connected to the second pin unit and the fourth control signal unit.

[0019] Preferably, the signal processing unit further includes a communication interface, an external touch display screen is connected to the communication interface, and the touch display screen monitors the temperature status of the lithium battery in real time.

[0020] Preferably, the system further includes a reset module connected to the temperature-sensing cable module, and the reset module is used to eliminate the alarm information issued by the signal processing unit and restart the lithium battery temperature monitoring system.

[0021] Preferably, the temperature-sensing cable includes a twisted pair and an outer sheath covering the outside of the twisted pair;

[0022] The twisted pair includes a steel core conductor and a temperature-sensing insulating layer covering the outside of the steel core conductor, and the steel core conductor is connected to the terminal resistor.

[0023] Second aspect, the present invention also provides a lithium battery temperature monitoring method for implementing the lithium battery temperature monitoring system as described in any one of the above first aspects, including:

[0024] Obtain the cell temperature value of the lithium battery monitored in real time by the battery management module and the resistance value in the closed loop of the temperature sensing cable monitored in real time by the signal processing unit;

[0025] Judge whether the cell temperature value of the monitored lithium battery is greater than a preset first temperature alarm threshold. If so, the battery management module controls the signal processing unit to send an alarm message and controls the first relay and the second relay to disconnect;

[0026] If the cell temperature of the monitored lithium battery is greater than a preset second temperature alarm threshold and no alarm message has been sent, then judge whether the resistance value in the closed loop of the monitored temperature sensing cable is less than a preset resistance alarm threshold;

[0027] If so, the temperature sensing cable monitoring module controls the signal processing unit to send an alarm message and controls the first relay and the second relay to disconnect.

[0028] Preferably, the method further includes: the signal processing unit displays the temperature status of the lithium battery according to the indication signal of the indicator light;

[0029] If the green light in the indicator light is on, the temperature of the lithium battery is normal;

[0030] If the red light in the indicator light is on, the temperature of the lithium battery is too high.

[0031] Compared with the prior art, the lithium battery temperature monitoring system provided by the present invention effectively reduces the risk of software errors during lithium battery temperature monitoring and saves production costs by setting the battery management module and the temperature sensing cable monitoring module to monitor the cell temperature of the lithium battery in real time. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only a part of the embodiments of the present invention, rather than all the embodiments. For those of ordinary skill in the art, without creative efforts, other drawings obtained based on these drawings all belong to the scope of protection of the present invention.

[0033] Figure 1 It is a schematic framework structure diagram of a lithium battery temperature monitoring system provided by an embodiment of the present invention;

[0034] Figure 2 It is a schematic structure diagram of a battery pack provided by an embodiment of the present invention;

[0035] Figure 3 A structural schematic diagram of a temperature-sensitive cable provided by an embodiment of the present invention;

[0036] Figure 4 A flowchart of a lithium battery temperature monitoring method provided by an embodiment of the present invention.

[0037] Among them, 10 is a battery pack, 11 is a lithium battery cell, 111 is a cell explosion-proof valve, 12 is a temperature-sensitive cable, 121 is a twisted pair, 1211 is a steel core conductor, 1212 is a temperature-sensitive insulating layer, and 122 is an outer sheath. Detailed implementation manners

[0038] In order to make the objectives, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0039] In order to make the description of the content of the present invention more detailed and complete, the following provides an illustrative description of the implementation manners and specific embodiments of the present invention; however, this is not the only form for implementing or applying the specific embodiments of the present invention. The implementation manners cover the features of multiple specific embodiments and the method steps and their sequences for constructing and operating these specific embodiments. However, other specific embodiments can also be used to achieve the same or equivalent functions and step sequences. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

[0040] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects and do not have to be used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged under appropriate circumstances so that the embodiments of the present invention described here can be implemented in an order different from those illustrated or described here.

[0041] In the description of the embodiments of the present invention, unless otherwise specified, " / " means "or". For example, A / B can mean A or B; the "and / or" in the text is only a description of the association relationship of the associated objects, indicating that there can be three relationships. For example, A and / or B can mean: A exists alone, A and B exist simultaneously, and B exists alone. In addition, in the description of the embodiments of the present invention, "a plurality of" means two or more than two, and other quantifiers are similar. It should be understood that the preferred embodiments described here are only used to explain and interpret the present invention and are not used to limit the present invention, and the embodiments of the present invention and the features in the embodiments can be combined with each other without conflict.

[0042] To solve the technical problem that there is a risk of software errors when the existing BMS system monitors the temperature of lithium batteries, the present invention provides a lithium battery temperature monitoring system. Please refer to Figure 1-2 , Figure 1 which is a schematic diagram of the framework structure of a lithium battery temperature monitoring system provided by an embodiment of the present invention. Figure 2 which is a schematic diagram of the structure of a battery pack provided by an embodiment of the present invention. The lithium battery temperature monitoring system includes: a plurality of battery clusters composed of a plurality of lithium batteries, and each battery cluster is provided with a battery management module and a temperature-sensing cable monitoring module for monitoring the temperature state of the lithium battery; the temperature-sensing cable detection module includes a temperature-sensing cable, a signal processing unit and a terminal resistor respectively connected to both ends of the temperature-sensing cable; the temperature-sensing cable 12 is attached to the surface of the explosion-proof valve 111 of the battery core of the lithium battery for real-time monitoring of the temperature of the battery core 11 of the lithium battery; the terminal resistor is used to connect the steel core conductor in the temperature-sensing cable 12 so that the signal processing unit, the temperature-sensing cable 12 and the terminal resistor form a temperature-sensing cable closed loop; the signal processing unit is used to monitor the temperature-sensing cable closed loop in real time and determine whether to send an alarm message according to the monitoring result.

[0043] Specifically, in the embodiment of the present invention, the lithium battery system can be divided into 2-10 battery clusters, 2-17 battery packs 10 in each cluster are connected in series, and each battery cluster is provided with a battery management module and a temperature-sensing cable monitoring module for monitoring the temperature state of the lithium battery. The temperature-sensing cable monitoring module includes a terminal resistor, a temperature-sensing cable 12 and a signal processing unit. Among them, the temperature-sensing cable 12 can be attached to the surface of the explosion-proof valve 111 of the battery core of the lithium battery. Research shows that when the battery core of the lithium battery undergoes thermal runaway, the explosion-proof valve first reflects the signal of exceeding the temperature. In addition, the signal processing unit can be arranged inside or beside the high-voltage box of the battery cluster, while the terminal resistor is arranged at the farthest end inside the battery cluster, so as to form a temperature-sensing cable closed loop, enabling the signal processing unit to monitor the temperature of all single battery cores inside the battery cluster.

[0044] As an implementation manner, the monitoring result is the resistance value formed by the temperature-sensing cable closed loop; when the monitored resistance value is less than a preset resistance alarm threshold, the signal processing unit sends an alarm message. Specifically, in the embodiment of the present invention, the temperature-sensing cable 12 is made of a special material sensitive to temperature. The higher its own temperature, the smaller the internal resistance of the temperature-sensing cable 12 itself. Therefore, the signal processing unit can monitor the resistance value formed by the temperature-sensing cable closed loop in real time. When the monitored resistance value in the closed loop is less than the preset resistance alarm threshold, the signal processing unit will send an alarm message and cut off the main positive relay and the main negative relay.

[0045] As an implementation manner, the temperature sensing cable monitoring module includes a first relay U1 and a second relay U2, and the battery management module includes a third relay U3 and a fourth relay U4; the first relay U1 is respectively connected to the third relay U3 and the signal processing unit, and the second relay U2 is respectively connected to the fourth relay U4 and the signal processing unit.

[0046] Specifically, in the embodiment of the present invention, the first relay U1 is the total positive relay, the second relay U2 is the total negative relay, and the lithium battery temperature monitoring system includes a battery management module and a temperature sensing cable monitoring module. Under normal circumstances, the battery management module acts as the master controller to monitor the core temperature of the lithium battery. The third relay U3 controls the output of the total positive relay, and the fourth relay U4 controls the output of the total negative relay. The temperature sensing cable 12 monitoring module is a redundant module; and when the battery management module freezes due to software or the temperature detection point of the battery management module is far from the over-temperature point and fails to issue an over-temperature alarm in time at 55 degrees, the temperature sensing cable monitoring module monitors the core temperature of the lithium battery, and the signal processing unit controls the output of the total positive relay and the total negative relay.

[0047] As an implementation manner, the first relay U1 includes the power supply positive electrode of the first relay control line and the power supply negative electrode of the first relay control line. The third relay U3 includes a first control signal unit and a first pin unit, and the signal processing unit includes a second control signal unit; the power supply positive electrode of the first relay control line is connected to the first control signal unit, and the power supply negative electrode of the first relay control line is respectively connected to the first pin unit and the second control signal unit. Among them, the first control signal unit is the 24V+ voltage signal output by the third relay, and the first pin unit is the 3rd pin of the third relay.

[0048] Specifically, in the embodiments of the present invention, under normal circumstances, the third relay U3 is in an open state, its pin 4 is connected to pin 3, the voltage signal of 24V+ output by the battery management module is sent to the positive power supply of the total positive relay control line, and at the same time, the voltage signal of 24V- is sent to the negative power supply of the total positive relay control line. The battery management module controls the closing and opening of the total positive relay in this way; when the temperature of the lithium battery cell monitored by the temperature sensing cable monitoring module exceeds a certain temperature (for example, exceeds 65 degrees Celsius), the signal processing unit will output a voltage signal of 24V+ to pin 1 of the third relay U3. At this time, there is a current flowing between pin 1 and pin 2 of the third relay U3, and the third relay U3 will change from an open state to a closed state. The switch connecting pin 4 of the third relay U3 will jump to pin 5. At this time, pin 3 of the third relay U3 will become a "floating" state, that is, the negative power supply of the total positive relay control line will no longer be connected to the voltage signal of 24V-. At this time, the total positive relay is disconnected, and the signal processing unit issues an alarm message.

[0049] As an implementation manner, the second relay U2 includes the positive power supply of the second relay control line and the negative power supply of the second relay control line. The fourth relay includes a third control signal unit and a second pin unit. The signal processing unit further includes a fourth control signal unit; the positive power supply of the second relay control line is connected to the third control signal unit, and the negative power supply of the second relay control line is respectively connected to the second pin unit and the fourth control signal unit. Among them, the third control signal unit is the voltage signal of 24V+ output by the fourth relay, and the second pin unit is pin 3 of the fourth relay.

[0050] Specifically, in the embodiments of the present invention, under normal circumstances, the battery management module controls the closing and opening of the total negative relay; when the temperature of the lithium battery cell monitored by the temperature sensing cable monitoring module exceeds a certain temperature (for example, exceeds 65 degrees Celsius), the signal processing unit controls the total negative relay to disconnect and issues an alarm message.

[0051] As an implementation manner, the signal processing unit further includes a communication interface, and a touch display screen is externally connected to the communication interface. The touch display screen monitors the temperature status of the lithium battery in real time. Specifically, in the embodiments of the present invention, the touch display screen is a human-machine interaction interface, and the staff can monitor the temperature status of the lithium battery through the human-machine interaction interface in real time.

[0052] As an implementation manner, the system further includes a reset module connected to the temperature sensing cable module. The reset module is configured to eliminate the alarm information sent by the signal processing unit and restart the lithium battery temperature monitoring system. Specifically, in the embodiment of the present invention, the system further includes a reset module connected to the temperature sensing cable module. In the case where the temperature sensing cable monitoring module issues an over-temperature alarm, as a control at a higher level than the battery management module, after cutting off the main positive relay and the main negative relay, manual operation must be performed to eliminate the over-temperature alarm, and after restarting the lithium battery temperature monitoring system, the output of the main positive relay and the main negative relay can be restored to the normal control of the battery management module.

[0053] As an implementation manner, please refer to Figure 3 , Figure 3 FIG. is a schematic structural diagram of a temperature sensing cable provided by an embodiment of the present invention. The temperature sensing cable 12 includes a twisted pair 121 and an outer sheath 122 covering the outside of the twisted pair; the twisted pair 121 includes a steel core conductor 1211 and a temperature sensing insulating layer 1212 covering the outside of the steel core conductor. The steel core conductor 1211 is connected to the terminal resistor. Specifically, in the embodiment of the present invention, the outside of the steel core conductor 1211 is a temperature sensing insulating layer 1212. Under normal circumstances, the steel core conductor 1211 is in an insulating state. When the surrounding temperature rises to a predetermined operating temperature, the temperature sensing insulating layer 1212 breaks, and the two twisted steel core conductors are short-circuited, and the signal processing unit issues an alarm information.

[0054] The present invention provides a lithium battery temperature monitoring system, including: a plurality of battery clusters composed of a plurality of lithium batteries, and a battery management module and a temperature sensing cable monitoring module for monitoring the temperature state of the lithium batteries are arranged in each battery cluster; the temperature sensing cable detection module includes a temperature sensing cable, a signal processing unit and a terminal resistor respectively connected to both ends of the temperature sensing cable; the temperature sensing cable is attached to the surface of the explosion-proof valve of the lithium battery cell for real-time monitoring of the temperature of the lithium battery cell; the terminal resistor is used to connect the steel core conductor in the temperature sensing cable so that the signal processing unit, the temperature sensing cable and the terminal resistor form a temperature sensing cable closed loop; the signal processing unit is used to monitor the temperature sensing cable closed loop in real time and determine whether to issue alarm information according to the monitoring result. The monitoring system of the present invention effectively reduces the risk of software errors during lithium battery temperature monitoring and saves production costs by setting a battery management module and a temperature sensing cable monitoring module to monitor the temperature of the lithium battery cell in real time.

[0055] Based on the above lithium battery temperature monitoring system, the present invention further provides a lithium battery temperature monitoring method. Please refer to Figure 4 , Figure 4The flowchart of a lithium battery temperature monitoring method provided by an embodiment of the present invention includes: Step S101, obtaining the cell temperature value of the lithium battery monitored in real time by the battery management module and the resistance value in the closed loop of the temperature sensing cable monitored in real time by the signal processing unit; Step S102, determining whether the monitored cell temperature value of the lithium battery is greater than a preset first temperature alarm threshold. If so, the battery management module controls the signal processing unit to send an alarm message and controls the first relay and the second relay to disconnect; Step S103, if the monitored temperature of the lithium battery is greater than a preset second temperature alarm threshold and no alarm message has been sent, then determine whether the monitored resistance value in the closed loop of the temperature sensing cable is less than a preset resistance alarm threshold. If so, the temperature sensing cable monitoring module controls the signal processing unit to send an alarm message and controls the first relay and the second relay to disconnect. For example, in the embodiment of the present invention, the first temperature alarm threshold can be set to 55 degrees Celsius, and the second temperature alarm threshold can be set to 65 degrees Celsius. Under normal circumstances, when the battery management module reaches 55 degrees Celsius, the battery management module controls the signal processing unit to send an alarm message and controls the first relay and the second relay to disconnect; if it is monitored that the cell temperature of the lithium battery is greater than 65 degrees Celsius and no alarm message has been sent, then the temperature sensing cable monitoring module controls the signal processing unit to send an alarm message and controls the first relay and the second relay to disconnect.

[0056] As an implementation manner, the method further includes: the signal processing unit displays the temperature status of the lithium battery according to the indication signal of the indicator light; if the green light in the indicator light is on, the temperature of the lithium battery is normal; if the red light in the indicator light is on, the temperature of the lithium battery is too high. Specifically, in the embodiment of the present invention, the signal processing unit has a built-in display light, the green light indicates that the temperature of the lithium battery is normal, the red light indicates that the temperature of the lithium battery is too high and an alarm is issued, and the yellow light indicates that a fault has occurred in the lithium battery temperature monitoring system.

[0057] The lithium battery temperature monitoring method provided by the embodiment of the present invention can implement the technical solutions of the lithium battery temperature monitoring system in any of the above embodiments. Its implementation principle and beneficial effects are similar to those of the lithium battery temperature monitoring system. For details, refer to the implementation principle and beneficial effects of the lithium battery temperature monitoring system, which will not be elaborated here.

[0058] In several embodiments provided by the present invention, it should be understood that the disclosed devices and methods can be implemented in other ways. For example, the device embodiments described above are merely illustrative. For example, the division of units is only a logical function division. In actual implementation, there may be other division methods. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the displayed or discussed couplings or direct couplings or communication connections between each other can be through some interfaces. The indirect couplings or communication connections of devices or units can be in electrical, mechanical or other forms.

[0059] In addition, each functional unit in various embodiments of the present invention can be integrated in a processing unit, or each unit can exist physically alone, or two or more units can be integrated in one unit. The above-mentioned integrated units can be implemented in the form of hardware or in the form of software functional units. The above is only the implementation manner of the present invention and does not limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made by using the content of the specification and drawings of the present invention, or directly or indirectly applied in other related technical fields, shall be included in the patent protection scope of the present invention by the same token.

[0060] The above are only the preferred embodiments of the present invention and do not impose any formal limitations on the present invention. Although the present invention has been disclosed as above with the preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or refinements to equivalent variations within the scope of the technical solution of the present invention by using the disclosed technical content. However, as long as it does not deviate from the content of the technical solution of the present invention, any brief modifications, equivalent variations and refinements made to the above embodiments based on the technical essence of the present invention shall still fall within the scope of the technical solution of the present invention.

Claims

1. A method for monitoring the temperature of a lithium battery, characterized in that, Including: Obtain the cell temperature value of the lithium battery monitored in real time by the battery management module, and the resistance value in the closed loop of the temperature-sensing cable monitored in real time by the signal processing unit; Judge whether the cell temperature value of the monitored lithium battery is greater than a preset first temperature alarm threshold. If so, the battery management module controls the signal processing unit to send an alarm message and controls the first relay and the second relay to disconnect; If it is monitored that the temperature of the lithium battery is greater than a preset second temperature alarm threshold and no alarm message has been sent, then judge whether the resistance value in the closed loop of the monitored temperature-sensing cable is less than a preset resistance alarm threshold; If so, the temperature-sensing cable monitoring module controls the signal processing unit to send an alarm message and controls the first relay and the second relay to disconnect.

2. The lithium battery temperature monitoring method according to claim 1, wherein The method further includes: the signal processing unit displays the temperature status of the lithium battery according to the indication signal of the indicator light; If the green light in the indicator light is on, the temperature of the lithium battery is normal; If the red light in the indicator light is on, the temperature of the lithium battery is too high.

3. A lithium battery temperature monitoring system, characterized in that, The system is used to implement the lithium battery temperature monitoring method according to any one of claims 1-2, including: A plurality of battery clusters composed of a plurality of lithium batteries, and a battery management module and a temperature-sensing cable monitoring module for monitoring the temperature status of the lithium battery are arranged in each battery cluster; The temperature-sensing cable monitoring module includes a temperature-sensing cable, a signal processing unit and a terminal resistor respectively connected to both ends of the temperature-sensing cable; The temperature-sensing cable is attached to the surface of the cell explosion-proof valve of the lithium battery for real-time monitoring of the cell temperature of the lithium battery; The terminal resistor is used to connect the steel core conductor in the temperature-sensing cable so that the signal processing unit, the temperature-sensing cable and the terminal resistor form a closed loop of the temperature-sensing cable; The signal processing unit is used to monitor the closed loop of the temperature-sensing cable in real time and judge whether an alarm message needs to be sent according to the monitoring result.

4. The lithium battery temperature monitoring system according to claim 3, wherein The monitoring result is the resistance value formed by the closed loop of the temperature-sensing cable; When the monitored resistance value is less than a preset resistance alarm threshold, the signal processing unit sends an alarm message.

5. The lithium battery temperature monitoring system according to claim 4, characterized in that, The temperature-sensing cable monitoring module includes a first relay and a second relay, and the battery management module includes a third relay and a fourth relay; The first relay is respectively connected to the third relay and the signal processing unit, and the second relay is respectively connected to the fourth relay and the signal processing unit.

6. The lithium battery temperature monitoring system according to claim 5, characterized in that, The first relay includes the positive power supply of the first relay control line and the negative power supply of the first relay control line. The third relay includes a first control signal unit and a first pin unit, and the signal processing unit includes a second control signal unit; The positive power supply of the first relay control line is connected to the first control signal unit, and the negative power supply of the first relay control line is respectively connected to the first pin unit and the second control signal unit.

7. The lithium battery temperature monitoring system according to claim 6, characterized in that, The second relay includes the positive power supply of the second relay control line and the negative power supply of the second relay control line. The fourth relay includes a third control signal unit and a second pin unit, and the signal processing unit further includes a fourth control signal unit; The positive power supply of the second relay control line is connected to the third control signal unit, and the negative power supply of the second relay control line is respectively connected to the second pin unit and the fourth control signal unit.

8. The lithium battery temperature monitoring system according to claim 7, wherein, The signal processing unit further includes a communication interface, an external touch display screen is connected to the communication interface, and the touch display screen monitors the temperature status of the lithium battery in real time.

9. The lithium battery temperature monitoring system according to claim 3, wherein The system further includes a reset module connected to the temperature sensing cable module. The reset module is used to eliminate the alarm information sent by the signal processing unit and restart the lithium battery temperature monitoring system.

10. The lithium battery temperature monitoring system according to claim 3, wherein The temperature sensing cable includes a twisted pair and an outer sheath covering the outside of the twisted pair; The twisted pair includes a steel core conductor and a temperature sensing insulating layer covering the outside of the steel core conductor. The steel core conductor is connected to the terminal resistor.

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