Thermal runaway temperature sensor with high thermal conductivity, high temperature resistance and high pressure resistance

Abstract

The utility model provides a thermal runaway temperature sensor with high thermal conductivity, high temperature resistance and high voltage resistance, which comprises an insulating high-temperature-resistant packaging sleeve, a temperature sensing resistor, a lead electrically connected with an external circuit, and a high-thermal-conductivity shell, the temperature-sensitive resistor and a welding point of the temperature-sensitive resistor and the wire are wrapped and packaged in an insulating high-temperature-resistant packaging sleeve to form a temperature-sensitive resistor insulating temperature-resistant wrapping head, the whole temperature-sensitive resistor insulating temperature-resistant wrapping head extends into a high-heat-conduction shell, the shell is filled with high-temperature-resistant pouring sealant, and the other end of the wire extends out of the shell. The insulating high-temperature-resistant packaging sleeve adopts a high-temperature-resistant heat-shrinkable tube, and the high-temperature-resistant heat-shrinkable tube is encapsulated, so that the curing time of a common packaging material is shortened, and the production efficiency is improved; the high-temperature-resistant heat shrink tube not only enables the temperature sensor product to have the advantage of high temperature resistance, but also has better physical insulation and special voltage resistance than common packaging materials, and improves the insulation and voltage resistance of the temperature sensor product.

Description

Technical Field

[0001] The utility model relates to the field of NTC temperature sensors, in particular to a thermal runaway temperature sensor with high thermal conductivity, high temperature resistance and high pressure resistance. Background Art

[0002] At present, the new energy industry is developing rapidly, and batteries are being used more and more widely in various products. Most of the batteries in cars on the market are lithium batteries. There is a diaphragm between the positive and negative electrodes. When a car accident occurs, foreign objects will hit or pierce the diaphragm, which will cause the lithium battery to short-circuit and heat up, and eventually burn. Electric vehicles may also spontaneously combust when charging. The real reason is that the battery cell is overcharged, which will cause the positive electrode structure in the battery to collapse, and a large amount of lithium ions and gases will be released, which will squeeze the diaphragm in the battery. Lithium metal will also accumulate at the negative electrode, which can easily pierce the diaphragm to cause a battery short circuit, thereby causing thermal runaway and spontaneous combustion. The market urgently needs a temperature sensor with high thermal conductivity, high temperature resistance, and high voltage resistance to provide timely feedback signals when the battery is in thermal runaway, help cut off the circuit, and avoid further battery fires. Utility Model Content

[0003] The purpose of the utility model is to overcome the defects of the prior art and provide a thermal runaway temperature sensor with high thermal conductivity, high temperature resistance and high pressure resistance. The utility model at least solves some of the problems in the prior art.

[0004] The utility model is achieved in this way:

[0005] The utility model provides a thermal runaway temperature sensor with high thermal conductivity, high temperature resistance and high pressure resistance, comprising an insulating high temperature resistant packaging sleeve, a temperature sensing resistor, a wire electrically connected to an external circuit, and a high thermal conductivity shell, one end of the wire is welded to the lead of the temperature sensing resistor, the temperature sensing resistor and the welding point of the temperature sensing resistor and the wire are all wrapped and packaged in the insulating high temperature resistant packaging sleeve to form an insulating temperature resistant package head of the temperature sensing resistor, the insulating temperature resistant package head of the temperature sensing resistor is integrally extended into the high thermal conductivity shell, the shell is filled with high temperature resistant potting glue, and the other end of the wire extends out of the shell.

[0006] Furthermore, the insulating high temperature resistant packaging sleeve adopts a high temperature resistant heat shrink tube.

[0007] Furthermore, the shell with high thermal conductivity is a metal shell.

[0008] Furthermore, the metal shell comprises a closed head and an open tail, and the insulating and heat-resistant package head of the temperature-sensitive resistor extends into the metal shell through the opening.

[0009] Furthermore, the metal shell is provided with external threads for installation.

[0010] Furthermore, a hexagonal nut structure is provided at the tail of the metal shell.

[0011] Furthermore, the temperature-sensitive resistor is arranged close to the head of the metal shell.

[0012] Furthermore, the temperature-sensitive resistor is a thermistor.

[0013] Furthermore, the thermistor is a single-ended glass-sealed thermistor.

[0014] Furthermore, the other end of the wire is electrically connected to a connector or a circuit board.

[0015] The utility model has the following beneficial effects:

[0016] 1. A thermal runaway temperature sensor with high thermal conductivity, high temperature resistance and high pressure resistance. By designing an external thread and a hexagonal nut structure outside a closed metal shell, the installability and disassembly of this type of temperature sensor are improved. At the same time, the metal material can also improve its thermal conductivity.

[0017] 2. High temperature resistant heat shrink tubing encapsulation reduces the curing time of ordinary packaging materials and improves production efficiency; high temperature resistant heat shrink tubing not only makes the temperature sensor product have the advantage of high temperature resistance, but also the physical insulation and pressure resistance properties of high temperature resistant heat shrink tubing are better than ordinary packaging materials, which improves the insulation and pressure resistance of temperature sensor products.

[0018] 3. In the utility model, the thermistor is arranged close to the head of the metal shell, and the temperature sensor conducts heat faster and has high consistency. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0020] Figure 1 A front view of a metal shell provided in an embodiment of the utility model;

[0021] Figure 2 A cross-sectional view of a metal shell provided in an embodiment of the utility model;

[0022] Figure 3 The embodiment of the utility model provides Figure 1 Bottom view of the middle metal shell;

[0023] Figure 4 A schematic diagram of a thermistor and a wire after welding provided by an embodiment of the utility model;

[0024] Figure 5 A schematic diagram of a thermistor and a welding point between the thermistor and a wire provided in an embodiment of the utility model are all wrapped and encapsulated in a high temperature resistant heat shrink tube to form a thermistor high temperature resistant heat shrink tube encapsulation head;

[0025] Figure 6 A schematic diagram of a thermistor high temperature resistant heat shrink tube encapsulating head extending into a metal shell provided by an embodiment of the utility model;

[0026] Figure 7 A partial cross-sectional view of the metal shell of the thermal runaway temperature sensor with high thermal conductivity, high temperature resistance and high pressure resistance provided by the embodiment of the utility model;

[0027] Figure 8 The embodiment of the utility model provides Figure 1 Enlarged image on the left.

[0028] In the figure: metal shell 1, external thread 2, hexagonal nut structure 3, thermistor 4, wire 5, high temperature resistant heat shrink tube 6, thermistor high temperature resistant heat shrink tube encapsulation head 7, metal shell head 8, metal shell tail 9, welding point 10, potting glue 11. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0030] like Figure 1-Figure 8The embodiment of the utility model provides a high thermal conductivity, high temperature resistance, and high voltage thermal runaway temperature sensor, including an insulating high temperature resistant packaging sleeve, a temperature sensing resistor, a wire 5 electrically connected to an external circuit, and a high thermal conductivity shell. One end of the wire 5 is welded to the lead of the temperature sensing resistor. The temperature sensing resistor and the welding point 10 between the temperature sensing resistor and the wire are all wrapped and packaged in the insulating high temperature resistant packaging sleeve to form an insulating temperature resistant package head of the temperature sensing resistor. The insulating temperature resistant package head of the temperature sensing resistor extends into the high thermal conductivity shell as a whole. The shell is filled with a high temperature resistant potting glue 11 for fixing the insulating temperature resistant package head of the temperature sensing resistor. The other end of the wire 5 extends out of the shell, and the other end of the wire 5 is electrically connected to an external connector or circuit board. In this embodiment, the insulating high temperature resistant packaging sleeve adopts a high temperature resistant heat shrink tube 6; the temperature sensing resistor is a thermistor 4, and the thermistor 4 adopts a single-ended glass-sealed thermistor; the insulating temperature resistant package head of the temperature sensing resistor is the thermistor high temperature resistant heat shrink tube package head 7 in the figure. High temperature resistant heat shrink tubing encapsulation reduces the curing time of ordinary packaging materials and improves production efficiency; high temperature resistant heat shrink tubing not only makes the temperature sensor product have the advantage of high temperature resistance, but also the physical insulation and pressure resistance properties of high temperature resistant heat shrink tubing are better than ordinary packaging materials, which improves the insulation and pressure resistance of temperature sensor products.

[0031] In the utility model, the thermistor 4 and the leads of the thermistor are wrapped in a high-temperature resistant heat shrink tube 6, so that the thermistor 4 and the leads of the thermistor are effectively protected, and the leads of the thermistor can be prevented from bending in the metal shell 1 and directly contacting the metal shell wall, thereby avoiding the leakage current problem during the voltage resistance test; at the same time, the high-temperature resistant heat shrink tube 6 is used to encapsulate the thermistor and its leads, and the heat shrink tube is slightly heated to make the heat shrink tube tightly cover the thermistor and its leads, and the encapsulation effect is good. Compared with the conventional method of encapsulating the thermistor with epoxy resin, it does not require long-term oven curing, and the efficiency is higher.

[0032] In this embodiment, the high thermal conductivity shell is a metal shell 1. The metal shell 1 includes a closed head and an open tail, and the temperature-sensitive resistor insulation and heat-resistant package head extends into the metal shell 1 through the opening. The thermistor 4 is arranged close to the metal shell head 8, and the temperature sensor conducts heat faster and has high consistency. The metal shell 1 is provided with an external thread 2 for installation, and the external thread 2 is located in the middle area of ​​the metal shell 1. The metal shell tail 9 is provided with a hexagonal nut structure 3 that can be matched with tools such as wrenches. The utility model improves the installability and disassembly of such temperature sensors by designing external threads and hexagonal nut structures outside the closed metal shell, and the metal material can also improve its thermal conductivity.

[0033] The inner wall of the metal shell 1 may be designed with internal threads or grooves to increase the surface roughness so as to better combine with the potting glue in the metal shell 1 .

[0034] The utility model provides a thermal runaway temperature sensor with high thermal conductivity, high temperature resistance and high voltage resistance. The thermal conductivity of the temperature sensor is improved by using a metal shell; a high-temperature resistant heat shrink tube is used to directly cover the thermistor to achieve rapid packaging; and high-temperature resistant packaging materials and wires are used to meet the operating temperature and insulation voltage resistance requirements of the temperature sensor.

[0035] The temperature sensor realizes long-term and efficient monitoring of battery temperature, and can provide timely feedback signals when the battery thermally runs away, helping to cut off the circuit and avoid further battery fires, greatly improving the safety and reliability of the battery.

[0036] In the utility model, an external thread 2 and a hexagonal nut structure 3 are designed on the outside of the closed metal shell 1. The closed metal shell 1 is formed by turning and tapping; the size of the external thread 2 depends on the specifications of the installation hole, and the hexagonal nut structure 3 is convenient for installation and removal; if the temperature sensor needs to be disassembled and replaced, a wrench or other tools can be used in conjunction with the hexagonal nut structure for installation and removal.

[0037] The thermistor 4 and one end of the wire 5 are welded together. In order to avoid the soldering point of the temperature sensor from being desoldered when working, medium frequency inverter welding is used here to melt the two together to ensure the quality of the soldering point; after the thermistor 4 and the wire 5 are welded, the thermistor 4 is encapsulated with a high-temperature resistant heat shrink tube 6 to form a thermistor high-temperature resistant heat shrink tube encapsulation head 7, and the welding point of the thermistor 4 and the wire 5 is also located in the high-temperature resistant heat shrink tube 6. The thermistor high-temperature resistant heat shrink tube encapsulation head 7 is encapsulated in the cavity of the metal shell 1 with a high-temperature resistant packaging material as a whole. The other end of the wire 5 can be installed with a connector or directly welded to the circuit board according to actual needs, and finally a high thermal conductivity, high temperature resistance, and high pressure resistance thermal runaway temperature sensor is formed. The temperature sensor is installed to the position to be measured through the external thread 2 on the metal shell 1 and can be put into use.

[0038] The contents not described in detail in this specification belong to the prior art known to professional and technical personnel in this field.

[0039] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A thermal runaway temperature sensor with high thermal conductivity, high temperature resistance and high pressure resistance, characterized in that: It includes an insulating high-temperature resistant packaging sleeve, a temperature-sensitive resistor, a wire electrically connected to an external circuit, and a high-thermal conductivity shell. One end of the wire is welded to the lead of the temperature-sensitive resistor. The temperature-sensitive resistor and the welding point between the temperature-sensitive resistor and the wire are all wrapped and packaged in the insulating high-temperature resistant packaging sleeve to form an insulating and heat-resistant package head of the temperature-sensitive resistor. The insulating and heat-resistant package head of the temperature-sensitive resistor extends as a whole into the high-thermal conductivity shell. The shell is filled with high-temperature resistant potting glue, and the other end of the wire extends out of the shell.

2. The thermal runaway temperature sensor with high thermal conductivity, high temperature resistance and high pressure resistance as claimed in claim 1, characterized in that: The insulating high temperature resistant packaging sleeve adopts a high temperature resistant heat shrink tube.

3. The thermal runaway temperature sensor with high thermal conductivity, high temperature resistance and high pressure resistance as claimed in claim 1, characterized in that: The high thermal conductivity housing is a metal shell.

4. The high thermal conductivity, high temperature resistance, and high pressure resistance thermal runaway temperature sensor according to claim 3, characterized in that: The metal shell comprises a closed head and an open tail, and the insulating and heat-resistant package head of the temperature-sensitive resistor extends into the metal shell through the opening.

5. The thermal runaway temperature sensor with high thermal conductivity, high temperature resistance and high pressure resistance as claimed in claim 4, characterized in that: The metal shell is provided with external threads for installation.

6. The thermal runaway temperature sensor with high thermal conductivity, high temperature resistance and high pressure resistance as claimed in claim 5, characterized in that: A hexagonal nut structure is arranged at the tail of the metal shell.

7. The thermal runaway temperature sensor with high thermal conductivity, high temperature resistance and high pressure resistance as claimed in claim 4, characterized in that: The temperature sensing resistor is arranged close to the head of the metal shell.

8. The thermal runaway temperature sensor with high thermal conductivity, high temperature resistance and high pressure resistance as claimed in claim 1, characterized in that: The temperature sensing resistor is a thermistor.

9. The thermal runaway temperature sensor with high thermal conductivity, high temperature resistance and high pressure resistance as claimed in claim 8, characterized in that: The thermistor is a single-ended glass-sealed thermistor.

10. The thermal runaway temperature sensor with high thermal conductivity, high temperature resistance and high pressure resistance as claimed in claim 1, characterized in that: The other end of the wire is electrically connected to a connector or a circuit board.

Images