A temperature sensor with a connecting FPC for detecting a battery pack temperature

Abstract

The application discloses a temperature sensor with connected FPC for detecting battery pack temperature, which comprises a thermistor, the side of the thermistor is connected with two groups of FPC, the outside of the thermistor and FPC is encapsulated with encapsulated epoxy resin, the outside of the encapsulated epoxy resin is provided with a plastic shell, the outside of the plastic shell is provided with pouring epoxy resin, the side of the pouring epoxy resin outside is sleeved with a heat-conducting ring. The two groups of extrusion blocks can extrude and fix the circuit board connected with the FPC, so that the external circuit board and wire are firmly connected with the FPC, and when the lines are pulled, the whole line and the sensor are moved, the surface line is separated from the sensor, the service life of the sensor is improved, and the shielding cover can not only protect the FPC, but also further enhance the heat insulation and shielding property of the FPC.

Description

Technical Field

[0001] This invention relates to the field of temperature sensor technology, specifically a temperature sensor for detecting the temperature of a battery pack connected to an FPC. Background Technology

[0002] In recent years, the use of automotive wiring harnesses has increased with the continuous installation of automotive electronic and electrical products. Because the production of automotive wiring harnesses requires a large workforce, it is considered a typical labor-intensive industry. The development plan for the new energy vehicle industry proposes to break through common energy-saving technologies such as lightweighting of new energy vehicles, which will be the future direction of automotive lightweighting. Temperature sensors are sensors that can sense temperature and convert it into a usable output signal. With the popularization and widespread application of new energy vehicles, the "battery," a crucial component of new energy vehicles, is receiving particular attention. New energy vehicles must control the temperature of their batteries to ensure their safety performance and whether it remains within a controllable range. Therefore, temperature monitoring of battery cells is an indispensable part of new energy vehicles; hence, temperature sensors for detecting automotive battery cells have emerged.

[0003] Current temperature sensors have certain shortcomings in use:

[0004] 1. Temperature sensors transmit signals through a large wire harness. However, the wire harness is not easy to bend and does not have the effect of shielding signals or heat insulation, so it cannot be used in different environments, and the sensor...

[0005] 2. At the same time, the contact area between the temperature sensor and the battery pack is very small, which will result in poor temperature measurement effect, long response time, and inability to detect temperature quickly, resulting in poor temperature measurement accuracy.

[0006] 3. When connecting the wire to the temperature sensor, displacement and offset may occur between the wire and the sensor. The wire may also shake during use, causing the connection between the wire and the sensor to break. Summary of the Invention

[0007] The purpose of this invention is to provide a temperature sensor for detecting the temperature of a battery pack connected to a FPC, in order to solve the related problems mentioned in the background art.

[0008] To achieve the above objectives, the present invention provides the following technical solution: a temperature sensor for detecting the temperature of a battery pack connected to an FPC, comprising a thermistor, two sets of FPCs connected to one side of the thermistor, the thermistor and the FPCs being encapsulated with encapsulating epoxy resin, a plastic shell being disposed outside the encapsulating epoxy resin, a potting epoxy resin being disposed outside the plastic shell, a heat-conducting ring being sleeved on one side of the potting epoxy resin, connecting plates being disposed on both sides of the bottom of the heat-conducting ring, contact plates being welded to the bottom of the two sets of connecting plates, a sealing sleeve being sleeved on the other side of the potting epoxy resin, a shielding cover being disposed on one side of the sealing cover, a second heat insulation cotton being disposed inside the shielding cover, a clamping assembly being disposed on the side of the shielding cover away from the potting epoxy resin, and a driving assembly being disposed on the side of the shielding cover.

[0009] Preferably, the clamping assembly includes a first heat insulation cotton, an extrusion block, a through hole, a telescopic rod, and a storage groove. The first heat insulation cotton is located on one side inside the shielding cover. The first heat insulation cotton has a through hole inside. The top and bottom of the through hole have storage grooves. The two sets of storage grooves are fitted with internally threaded sleeves. The top and bottom of the two sets of extrusion blocks are provided with telescopic rods.

[0010] Preferably, the drive assembly includes an internally threaded sleeve, a compression sleeve, and a thread. The thread is located on one side outside the shield, and the internally threaded sleeve is fitted on the outside of the thread. A compression sleeve is provided on one side of the internally threaded sleeve.

[0011] Preferably, one side of the top of the telescopic rod is inclined, and the telescopic rod is located inside the extrusion sleeve.

[0012] Preferably, the top of the telescopic rod extends out of the interior of the shield, and the telescopic rod and the shield slide against each other.

[0013] Preferably, the thermistor is a negative temperature coefficient thermistor, and the thermistor is a glass-encapsulated thermistor gold electrode resistor.

[0014] Preferably, the FPC material is PI25+Cu35+PI25, and the plastic shell is PA66+GF30, with a black color.

[0015] Preferably, the outer side of the second heat insulation cotton is coated with an adhesive, and the second heat insulation cotton is connected to the shielding cover by the adhesive.

[0016] Preferably, the contact plate and the heat-conducting ring are made of copper, and the heat-conducting ring and the contact plate are welded together by a connecting plate.

[0017] Compared with the prior art, the present invention provides a temperature sensor for detecting the temperature of a battery pack connected to an FPC, which has the following advantages:

[0018] 1. This invention, by giving the temperature sensor flexibility, can easily adapt to working conditions such as confined installation spaces. The reliable operation of the temperature sensor is ensured by the plastic structure, which ensures normal operation under harsh environmental conditions, protects the thermistor from damage and destruction, has good impact and bending resistance, strong corrosion resistance, high temperature resistance, and long service life. The initial design goal of FPC flexible flat cable was to replace bulky wire harnesses. FPC has advantages such as light weight, small size, neat and tight arrangement of wire cores, large information transmission capacity, and good bending resistance. In addition, the cable surface can be covered with auxiliary materials such as shielding, conductivity, and heat insulation to adapt to various special usage environment requirements.

[0019] 2. This invention utilizes a contact plate to contact the battery pack during sensor installation. The contact plate increases the temperature sensing area of ​​the battery pack and has good thermal conductivity, which can quickly conduct temperature to the sensor. This further increases and effectively improves the temperature sensor's sensitivity and detection accuracy, effectively avoiding serious safety accidents caused by long temperature sensing time and poor temperature detection accuracy.

[0020] 3. This invention uses two sets of extrusion blocks to extrude and fix the circuit board connected to the FPC, so that the external circuit board and wires are firmly connected to the FPC. At the same time, when there is pulling between the circuits, the circuit and the sensor move as a whole, and the surface circuit is separated from the sensor, which improves the service life of the sensor. The shielding cover not only protects the FPC, but also further enhances the heat insulation and shielding of the FPC. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the temperature sensor structure of the present invention;

[0022] Figure 2 This is a top sectional view of the present invention;

[0023] Figure 3 This is a front sectional view of the shielding cover of the present invention;

[0024] Figure 4 This is a side view of the shielding cover of the present invention;

[0025] Figure 5 For the present invention Figure 3 Enlarged view of point A.

[0026] In the diagram: 1. Thermistor; 2. FPC; 3. Encapsulated epoxy resin; 4. Plastic shell; 5. Potting epoxy resin; 6. Thermal ring; 7. Contact plate; 8. Connecting plate; 9. Sealing sleeve; 10. Internally threaded sleeve; 11. First thermal insulation cotton; 12. Extrusion block; 13. Extrusion sleeve; 14. Thread; 15. Shielding cover; 16. Second thermal insulation cotton; 17. Through hole; 18. Telescopic rod; 19. Storage groove. Detailed Implementation

[0027] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0028] Please see Figures 1-5 This invention provides a technical solution: a temperature sensor for detecting the temperature of a battery pack connected to an FPC, comprising a thermistor 1, two sets of FPCs 2 connected to one side of the thermistor 1, an encapsulating epoxy resin 3 encapsulating the outside of the thermistor 1 and FPCs 2, a plastic shell 4 disposed outside the encapsulating epoxy resin 3, a potting epoxy resin 5 disposed outside the plastic shell 4, a heat-conducting ring 6 sleeved on one side of the potting epoxy resin 5, connecting plates 8 disposed on both sides of the bottom of the heat-conducting ring 6, contact plates 7 welded to the bottom of the two sets of connecting plates 8, a sealing sleeve 9 sleeved on the other side of the potting epoxy resin 5, a shielding cover 15 disposed on one side of the sealing sleeve 9, a second heat insulation cotton 16 disposed inside the shielding cover 15, a clamping assembly disposed on the side of the shielding cover 15 away from the potting epoxy resin 5, and a driving assembly disposed on the side of the shielding cover 15.

[0029] As a preferred embodiment, the clamping assembly includes a first heat insulation cotton 11, a compression block 12, a through hole 17, a telescopic rod 18, and a storage groove 19. The first heat insulation cotton 11 is located on one side inside the shielding cover 15. The first heat insulation cotton 11 has a through hole 17 inside. The top and bottom of the through hole 17 have storage grooves 19 inside. The two sets of storage grooves 19 are fitted with internally threaded sleeves 10. The top and bottom of the two sets of compression blocks 12 are provided with telescopic rods 18, which can fix the external circuit and prevent it from detaching from the sensor.

[0030] As a preferred embodiment, the drive assembly includes an internal threaded sleeve 10, a compression sleeve 13, and a thread 14. The thread 14 is located on one side outside the shield 15. The internal threaded sleeve 10 is sleeved on the outside of the thread 14. The compression sleeve 13 is provided on one side of the internal threaded sleeve 10, which can compress the telescopic rod 18.

[0031] As a preferred embodiment, the top of the telescopic rod 18 is inclined on one side, and the telescopic rod 18 is located inside the extrusion sleeve 13, which facilitates the vertical movement of the telescopic rod 18.

[0032] As a preferred embodiment, the top of the telescopic rod 18 extends out of the interior of the shield 15, and the telescopic rod 18 and the shield 15 slide against each other, so that the telescopic rod 18 can move stably.

[0033] As a preferred embodiment, thermistor 1 is a negative temperature coefficient thermistor, and the thermistor is a glass-encapsulated thermistor gold electrode resistor, which makes the resistance detection effect better.

[0034] As a preferred embodiment, the FPC2 is made of PI25+Cu35+PI25, and the plastic shell 4 is made of PA66+GF30 and is black, which makes the FPC2 and the plastic shell 4 have a long service life.

[0035] As a preferred embodiment, the outer side of the second heat insulation cotton 16 is coated with adhesive, and the second heat insulation cotton 16 and the shielding cover 15 are connected by adhesive.

[0036] As a preferred embodiment, the contact plate 7 and the heat-conducting ring 6 are made of copper, and the heat-conducting ring 6 and the contact plate 7 are welded together by a connecting plate 8 to improve the robustness of the contact plate 7 and the heat-conducting ring 6.

[0037] Example 1, as Figure 2 As shown, when installing the sensor, the heat-conducting ring 6 is placed on the outside of the potting epoxy resin 5. At this time, the contact plate 7 is connected to the battery pack. It can be connected to the battery pack by welding. The contact plate 7 can increase the temperature sensing area of ​​the battery pack, and the contact plate 7 has good thermal conductivity, which can quickly conduct the temperature to the sensor, thereby further increasing and effectively improving the temperature sensor's temperature sensitivity and detection accuracy.

[0038] Example 2, as Figures 2-5 As shown, after the external wiring is connected, the internal threaded sleeve 10 is rotated. Under the action of the thread 14, the internal threaded sleeve 10 and the compression sleeve 13 move closer to the telescopic rod 18. The compression sleeve 13 contacts the inclined side of the telescopic rod 18, and the compression sleeve 13 pushes the telescopic rod 18 downward. The telescopic rod 18 drives the compression block 12 to move out of the storage groove 19. The two sets of compression blocks 12 move closer to each other to clamp and fix the wiring, so that the wiring and the sensor will not be separated. At the same time, the compression block 12 seals the through hole 17, improving the heat insulation and sealing of the shield 15, and effectively preventing short circuits caused by the rupture of FPC2.

[0039] Working Principle: The temperature sensor is flexible and can easily adapt to working conditions such as confined installation spaces. Its reliable operation is ensured by the plastic structure, which guarantees normal operation even in harsh environments, protecting the thermistor from damage. It offers good impact and bending resistance, strong corrosion resistance, high temperature resistance, and a long service life. The initial design goal of FPC flexible flat cables was to replace bulky wire harnesses. FPCs offer advantages such as light weight, compact size, neat and tight wire arrangement, large data transmission capacity, and good bending resistance. Furthermore, shielding, conductive, and heat-insulating materials can be added to the cable surface to adapt to various special operating environments.

[0040] When installing the sensor, it contacts the battery pack through the contact plate 7. The contact plate 7 can increase the temperature sensing area of ​​the battery pack, and the contact plate 7 has good thermal conductivity, which can quickly conduct the temperature to the sensor. This can further increase the temperature sensor's sensitivity and detection accuracy, effectively avoiding serious safety accidents caused by long temperature sensing time and poor temperature detection accuracy.

[0041] Two sets of compression blocks 12 can compress and fix the circuit board connected to FPC2, so that the external circuit board and wires are firmly connected to FPC2. At the same time, when there is pulling between the circuits, the circuit and the sensor move as a whole, and the surface circuit is separated from the sensor, which improves the service life of the sensor. The shielding cover 15 can not only protect FPC2, but also further enhance the heat insulation and shielding of FPC2.

[0042] Finally, it should be noted that the above content is only used to illustrate the technical solution of the present invention, and is not intended to limit the scope of protection of the present invention. Simple modifications or equivalent substitutions made by those skilled in the art to the technical solution of the present invention do not depart from the essence and scope of the technical solution of the present invention.

Claims

1. A temperature sensor for detecting the temperature of a battery pack connected to an FPC, comprising a thermistor (1), characterized in that: Two sets of FPCs (2) are connected to one side of the thermistor (1). The outer sides of the thermistor (1) and FPCs (2) are encapsulated with encapsulating epoxy resin (3). A plastic shell (4) is provided on the outer side of the encapsulating epoxy resin (3). A potting epoxy resin (5) is provided on the outer side of the plastic shell (4). A heat-conducting ring (6) is sleeved on one side of the outer side of the potting epoxy resin (5). Connecting plates (8) are provided on both sides of the bottom of the heat-conducting ring (6). Contact plates (7) are welded to the bottom of the two sets of connecting plates (8). A sealing sleeve (9) is sleeved on the other side of the outer side of the potting epoxy resin (5). A shielding cover (15) is provided on one side of the sealing cover (9). A second heat insulation cotton (16) is provided on the inner side of the shielding cover (15). A clamping assembly is provided on the inner side of the shielding cover (15) away from the potting epoxy resin (5). A driving assembly is provided on the outer side of the shielding cover (15). The clamping assembly includes a first heat insulation cotton (11), a compression block (12), a through hole (17), a telescopic rod (18), and a storage groove (19). The first heat insulation cotton (11) is located on one side inside the shield (15). The first heat insulation cotton (11) has a through hole (17) inside. The top and bottom of the through hole (17) have storage grooves (19). The two sets of storage grooves (19) are fitted with internal threaded sleeves (10). The top and bottom of the two sets of compression blocks (12) are provided with telescopic rods (18) that are far apart from each other. The compression block (12) can seal the through hole (17) to improve the heat insulation and sealing of the shield (15).

2. The temperature sensor for detecting the temperature of a battery pack connected to an FPC according to claim 1, characterized in that: The drive assembly includes an internal threaded sleeve (10), a compression sleeve (13), and a thread (14). The thread (14) is located on one side outside the shield (15). The internal threaded sleeve (10) is sleeved on the outside of the thread (14), and the compression sleeve (13) is provided on one side of the internal threaded sleeve (10).

3. A temperature sensor for detecting the temperature of a battery pack connected to an FPC according to claim 1, characterized in that: The top side of the telescopic rod (18) is inclined, and the telescopic rod (18) is located inside the extrusion sleeve (13).

4. A temperature sensor for detecting the temperature of a battery pack connected to an FPC according to claim 1, characterized in that: The top of the telescopic rod (18) extends out of the interior of the shield (15), and the telescopic rod (18) and the shield (15) slide against each other.

5. A temperature sensor for detecting the temperature of a battery pack connected to an FPC according to claim 1, characterized in that: The thermistor (1) is a negative temperature coefficient thermistor, and the thermistor is a glass-encapsulated thermistor gold electrode resistor.

6. A temperature sensor for detecting the temperature of a battery pack connected to an FPC according to claim 1, characterized in that: The FPC (2) is made of PI25+Cu35+PI25, and the plastic shell (4) is made of PA66+GF30 and is black.

7. A temperature sensor for detecting the temperature of a battery pack connected to an FPC according to claim 1, characterized in that: The outer side of the second heat insulation cotton (16) is coated with adhesive, and the second heat insulation cotton (16) is connected to the shield (15) by adhesive.

8. A temperature sensor for detecting the temperature of a battery pack connected to an FPC according to claim 1, characterized in that: The contact plate (7) and the heat-conducting ring (6) are made of copper, and the heat-conducting ring (6) and the contact plate (7) are welded together by a connecting plate (8).

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