A lithium battery temperature real-time monitoring device

Abstract

The utility model belongs to temperature monitoring technical field discloses a kind of lithium battery temperature real-time monitoring equipment, including shell, shell inner wall is connected with lithium battery group, the center position of lithium battery group one end is connected with heat conduction block, and the outer end of lithium battery group is connected with multiple ducts, the scheme is in lithium battery group outside along the length direction of battery Multiple fitting ducts are laid out, and heat-conducting oil is filled in duct interior, the joint action of heat-conducting oil and heat block, the heat generated by battery surface local is quickly, evenly guided to heat conduction block and thermistor, the efficient real-time monitoring of whole battery temperature is realized, the structure can greatly improve the response speed to local overheating phenomenon, reduce the error caused by point measurement delay or measuring point offset, with fast thermal response, high thermal coupling degree, strong adaptability Advantage, significantly enhance the safety and stability of lithium battery system under complex working conditions.

Description

Technical Field

[0001] This utility model relates to the field of temperature monitoring technology, and in particular to a real-time temperature monitoring device for lithium batteries. Background Technology

[0002] Lithium batteries are a type of battery with high charging and discharging efficiency and relatively strong stability. However, lithium batteries generate a lot of heat during use, and excessive heat may cause instability. Therefore, it is necessary to monitor the temperature of lithium batteries in real time.

[0003] A search of Chinese utility model patent (publication number CN221687597U) reveals a temperature monitoring structure for a multi-cell lithium battery protection and control system. This structure, consisting of a main casing, a fan, and a thermistor, allows for real-time monitoring of the lithium battery temperature. During operation, the fan blows air into the main casing, carrying away heat from the lithium battery surface. This heat passes through the thermistor via the main casing, allowing the thermistor to detect the temperature. The temperature blown out from inside the main casing represents the overall temperature of the lithium battery, enabling comprehensive temperature monitoring and reducing monitoring errors. Furthermore, the fan's airflow helps dissipate heat from the lithium battery, making it more stable.

[0004] However, practical application has revealed that this technical solution still has at least the following drawbacks:

[0005] First, the heating of multiple cells inside the battery pack is not uniform, and single-point detection cannot cover all critical parts, easily missing local overheating areas; second, the airflow path driven by the fan is limited by the casing structure, which limits its cooling and heat transfer effect, and there are temperature fluctuations caused by air disturbance; in addition, the contact thermal resistance between the thermistor and the air is large, resulting in a lag in temperature measurement response, making it difficult to capture sudden temperature rise changes in a timely manner. Utility Model Content

[0006] This invention aims to provide a real-time lithium battery temperature monitoring device to solve the problems mentioned in the background art. This solution involves arranging multiple fitted pipes along the length of the battery outside the lithium battery pack and filling the pipes with heat-conducting oil. Through the combined action of the heat-conducting oil and the heat transfer block, the heat generated locally on the battery surface is quickly and evenly guided to the heat-conducting block and thermistor, achieving efficient real-time monitoring of the temperature of the entire battery pack. This structure can significantly improve the response speed to local overheating phenomena, reduce errors caused by point measurement delay or measurement point offset, and has the advantages of fast thermal response, high thermal coupling, and strong adaptability, significantly enhancing the safety and stability of the lithium battery system under complex working conditions.

[0007] To achieve the above objectives, this utility model provides the following technical solution:

[0008] A real-time temperature monitoring device for lithium batteries includes a housing, an inner wall of which is connected to a lithium battery pack. A heat-conducting block is connected to the center of one end of the lithium battery pack, and multiple pipes are connected to the outer end of the lithium battery pack. The multiple pipes extend along the length of each battery in the lithium battery pack and are tightly fitted to the surface of the battery. The interior of each of the multiple pipes is filled with heat-conducting oil. One end of the multiple pipes converges and connects to the heat-conducting block, and a thermistor is connected to the heat-conducting block.

[0009] Preferably, each battery in the lithium battery pack has at least two pipes at its outer end.

[0010] Preferably, the pipe is made of fluororubber.

[0011] Preferably, a plurality of heat transfer blocks are connected to one end of the outer wall of the pipe that contacts the surface of the lithium battery pack, and the plurality of heat transfer blocks are arranged at equal intervals along the length of the battery.

[0012] Preferably, one end of the heat transfer block is attached to the surface of the battery, and the other end of the heat transfer block extends into the inner cavity of the pipe and comes into contact with the heat transfer oil.

[0013] Preferably, the heat transfer block has an I-shaped cross-section.

[0014] The beneficial effects of this technical solution compared to existing technologies are as follows:

[0015] This solution involves arranging multiple fitted pipes along the length of the lithium battery pack on its exterior and filling the pipes with heat-conducting oil. Through the combined action of the heat-conducting oil and the heat transfer block, the heat generated locally on the battery surface is quickly and evenly guided to the heat transfer block and thermistor, achieving efficient real-time monitoring of the temperature of the entire battery pack. This structure can significantly improve the response speed to local overheating phenomena and reduce errors caused by point measurement delay or measurement point offset. It has the advantages of fast thermal response, high thermal coupling, and strong adaptability, significantly enhancing the safety and stability of the lithium battery system under complex operating conditions. Attached Figure Description

[0016] Figure 1 A schematic diagram of the internal structure of the outer shell provided for this utility model;

[0017] Figure 2 A schematic diagram of the external structure of the lithium battery pack provided by this utility model;

[0018] Figure 3 This is a schematic diagram of the cross-sectional structure of the pipeline provided by this utility model.

[0019] Reference numerals: 1. Outer casing; 2. Lithium battery pack; 3. Pipe; 4. Heat-conducting block; 5. Thermistor; 6. Heat transfer block. Detailed Implementation

[0020] Lithium batteries are a type of battery with high charging and discharging efficiency and relatively strong stability. However, lithium batteries generate a lot of heat during use, and excessive heat may cause instability. Therefore, it is necessary to monitor the temperature of lithium batteries in real time.

[0021] This invention proposes a novel real-time lithium battery temperature monitoring device that can more closely follow the battery structure distribution, improve the response speed of local abnormal heat sources, and achieve rapid and accurate monitoring of the overall thermal state of the battery, thereby improving the safety performance of the lithium battery system.

[0022] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments:

[0023] like Figure 1-3 The lithium battery temperature real-time monitoring device shown includes a housing 1, a lithium battery pack 2 connected to the inner wall of the housing 1, a heat-conducting block 4 connected to the center of one end of the lithium battery pack 2, and multiple pipes 3 connected to the outer end of the lithium battery pack 2. The multiple pipes 3 extend along the length direction of each battery in the lithium battery pack 2 and are tightly attached to the surface of the battery. The interior of the multiple pipes 3 is filled with heat-conducting oil. One end of the multiple pipes 3 converges and is connected to the heat-conducting block 4. A thermistor 5 is connected to the heat-conducting block 4.

[0024] In this embodiment, the above structure forms a temperature monitoring path with multi-point bonding and rapid heat conduction. With the help of multiple pipes 3 bonded to the outside of the battery pack 2, the heat changes in different areas of the lithium battery pack can be sensed in real time. When the temperature rises significantly in a certain area of ​​the battery surface, its heat will first be rapidly diffused through the heat-conducting oil in the pipe 3 and transferred to the heat-conducting block 4. The heat-conducting block 4, as the collecting end, concentrates the overall heat and conducts it to the thermistor 5 for sensing, thereby realizing the rapid identification of the overall thermal state of the lithium battery. This structure improves the response speed of local overheating and reduces error and hysteresis problems. The overall solution has good structural coupling and thermal response sensitivity.

[0025] Each battery in the lithium battery pack 2 has at least two pipes 3 at its outer end.

[0026] In this embodiment, by simultaneously laying pipes 3 on both sides of a single battery cell, a bidirectional path for heat capture is formed, effectively covering the main heat-generating area of ​​the battery casing. This double-sided bonding method reduces the path of heat conduction laterally on the battery surface, allowing the heat-conducting oil to absorb heat immediately and transfer it to the heat-conducting block 4 along the pipe direction, thereby improving the coverage and early warning capability of high-temperature area identification.

[0027] Pipe 3 is made of fluororubber.

[0028] In this embodiment, fluororubber has good high temperature resistance, chemical corrosion resistance and flexible bending properties, making it suitable for long-term use in the working environment of high-power lithium batteries. Although fluororubber has relatively low thermal conductivity, its flexibility allows the pipe 3 to better fit the battery surface. At the same time, the heat conduction path is reinforced by the subsequent embedding of heat transfer blocks 6, which effectively solves the problem of high thermal resistance of the pipe body and ensures that the overall system achieves a good balance between durability and thermal conductivity.

[0029] Multiple heat transfer blocks 6 are connected to one end of the outer wall of the pipe 3 that contacts the surface of the lithium battery pack 2. The multiple heat transfer blocks 6 are arranged at equal intervals along the length of the battery.

[0030] In this embodiment, the heat transfer block 6 acts as an intermediate thermal bridge between the battery and the pipe. By equidistantly arranging the blocks, it can achieve uniform heat collection from the battery surface. The area where the block 6 is in contact with the fluororubber pipe 3 forms a local high-conductivity hot spot, which compensates for the insufficient heat transfer of the rubber material, improves the uniformity of the pipe's response to battery heat and the conduction efficiency, and provides a sufficient thermal contact basis for subsequent heat absorption by the heat transfer oil.

[0031] One end of the heat transfer block 6 is attached to the surface of the battery, and the other end of the heat transfer block 6 extends into the inner cavity of the pipe 3 and comes into contact with the heat transfer oil.

[0032] In this embodiment, by designing the heat transfer block 6 to penetrate the pipe wall and extend into its inner cavity, it can directly contact the heat transfer oil, thereby forming a complete heat conduction path. The heat travels from the battery surface to the heat transfer block 6 to the heat transfer oil to the heat transfer block 4 to the thermistor 5. This path reduces the superposition of thermal resistance of multiple layers of media, improves heat transfer efficiency, and maintains the continuity and directionality of the thermal response process, making the temperature data more representative.

[0033] The cross-sectional shape of heat transfer block 6 is set to I-shape.

[0034] In this embodiment, the I-shaped structure provides good mechanical stability and bidirectional expandability. Its two end platforms correspond to the contact areas between the battery surface and the outer wall of the pipe, respectively. The middle vertical section can penetrate the pipe wall and be inserted into the heat transfer oil cavity, realizing the concentrated guidance of heat flow in the vertical direction. This structural design optimizes the geometric layout of the heat transfer path while ensuring structural stability, improving the overall heat transfer efficiency, further shortening the temperature response time, and enhancing the system's real-time perception capability for thermal mutation events.

[0035] The above descriptions are merely embodiments of this utility model. Commonly known technical solutions and / or characteristics are not described in detail here. It should be noted that those skilled in the art can make various modifications and improvements without departing from the technical solution of this utility model. These modifications and improvements should also be considered within the scope of protection of this utility model, and will not affect the effectiveness of the implementation of this utility model or the practicality of the patent. The scope of protection claimed in this application should be determined by the content of its claims, and the specific embodiments described in the specification can be used to interpret the content of the claims.

Claims

1. A lithium battery temperature real-time monitoring device, characterized in that: The device includes a housing (1), the inner wall of which is connected to a lithium battery pack (2). A heat-conducting block (4) is connected to the center of one end of the lithium battery pack (2), and the outer end of the lithium battery pack (2) is connected to multiple pipes (3). The multiple pipes (3) extend along the length of each battery in the lithium battery pack (2) and are tightly attached to the surface of the battery. The multiple pipes (3) are filled with heat-conducting oil. One end of the multiple pipes (3) converges and is connected to the heat-conducting block (4). A thermistor (5) is connected to the heat-conducting block (4).

2. The lithium battery temperature real-time monitoring device according to claim 1, characterized in that: Each battery in the lithium battery pack (2) has at least two pipes (3) at its outer end.

3. The lithium battery temperature real-time monitoring device according to claim 1, characterized in that: The material of the pipe (3) is fluororubber.

4. The lithium battery temperature real-time monitoring device according to claim 1, characterized in that: The outer wall of the pipe (3) is connected to a plurality of heat transfer blocks (6) at one end that contacts the surface of the lithium battery pack (2), and the plurality of heat transfer blocks (6) are arranged at equal intervals along the length of the battery.

5. The lithium battery temperature real-time monitoring device according to claim 4, characterized in that: One end of the heat transfer block (6) is attached to the surface of the battery, and the other end of the heat transfer block (6) extends into the inner cavity of the pipe (3) and comes into contact with the heat transfer oil.

6. The lithium battery temperature real-time monitoring device according to claim 4, characterized in that: The heat transfer block (6) has an I-shaped cross-section.

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