Power battery NTC (Negative Temperature Coefficient) temperature sensor capable of resisting copper migration

Abstract

The invention discloses a power battery NTC temperature sensor capable of resisting copper migration, and belongs to the field of temperature sensors. A power battery NTC temperature sensor resistant to copper migration comprises a lead and a chip connected to the end of the lead, and further comprises a connecting cylinder, and the lead is connected into the connecting cylinder; the epoxy resin packaging material is used for packaging and protecting partial structures of the lead, the chip and the connecting cylinder, and the connecting cylinder is in a setting state that a part of the connecting cylinder is embedded into the epoxy resin packaging material; a box body is fixedly arranged in the sliding cylinder, a sealant containing cavity is formed in the box body, an inclined hole is formed between the sealant containing cavity and the round hole, and a control assembly for controlling the inclined hole to be opened and closed is further arranged in the box body; the phenomenon of copper migration is avoided, the problem that the NTC temperature sensor of the power battery misreports high temperature due to low resistance and high temperature is solved, and the overall service life of the battery is prolonged.

Description

Technical Field

[0001] This invention relates to the field of temperature sensor technology, and more particularly to a power battery NTC temperature sensor that resists copper migration. Background Technology

[0002] An NTC temperature sensor consists of an NTC thermistor chip, leads, and metal terminals or connectors. The NTC thermistor chip is the core of the temperature sensor. The thermistor chip is a dense semiconductor ceramic formed by sintering metal oxides such as manganese, cobalt, nickel, and copper at high temperatures. Noble metal electrodes are attached to both sides of the ceramic, and its resistance decreases rapidly as the temperature rises.

[0003] When the temperature of an NTC temperature sensor rises, its resistance decreases. The formula for the relationship between resistance and temperature is: ,in This represents the resistance value of an NTC thermistor at a certain temperature. This represents the resistance value of the NTC thermistor at the rated temperature (reference temperature). Represents the operating temperature; Represents the rated temperature (reference temperature); The material constant representing an NTC thermistor is also called the thermistor index. This characteristic allows us to determine the corresponding temperature by measuring its resistance value, thereby achieving the purpose of temperature detection and control.

[0004] Currently, the operating environment of power batteries includes factors such as temperature cycling and mechanical stress. For example, the battery experiences significant temperature changes during charging and discharging, and the thermal expansion coefficients of the Dummex leads differ from those of other components. Repeated thermal expansion and contraction generate stress, which can easily lead to breakage or cracks over time. This causes copper (Cu) migration within the cracks in the NTC temperature sensor, forming a parallel model with lower resistance. The migration principle is that on the cathode side, Cu... 2+ or Cu + Ions gain electrons and are reduced to Cu; on the anode side, Cu loses electrons due to factors such as moisture and becomes Cu. + or Cu 2+ Meanwhile, the intrusion of moisture also provides conditions for this electrochemical process. Specifically, at the crack location, copper undergoes electrochemical migration, and the presence of dendrites forms an unstable parallel resistance between the electrodes, resulting in a decrease in overall resistance. This leads to the problem of the power battery NTC temperature sensor falsely reporting high temperature as "low resistance, high temperature," meaning that the actual resistance value monitored by the battery management system is lower, thus incorrectly reporting a high temperature. This causes the BMS to incorrectly determine that the battery is in an overheated state, thereby triggering the protection mechanism and shortening the overall lifespan of the battery. In view of this, the present invention is proposed. Summary of the Invention

[0005] The purpose of this invention is to solve the problems existing in the prior art by proposing a power battery NTC temperature sensor that resists copper migration.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: A copper migration-resistant NTC temperature sensor for power batteries includes leads and a chip connected to the ends of the leads, and further includes: A connecting cylinder, wherein the lead wire is connected inside the connecting cylinder; An epoxy resin encapsulation material is used to encapsulate and protect the lead wire, chip and connecting tube, wherein the connecting tube is partially embedded in the epoxy resin encapsulation material. A sliding cylinder is slidably disposed inside a connecting cylinder. A box body is fixedly disposed inside the sliding cylinder. The box body has a circular hole for the lead wire to pass through. The box body has a sealant placement cavity. An oblique hole is provided between the sealant placement cavity and the circular hole. A control component for controlling the opening and closing of the oblique hole is also provided inside the box body.

[0007] Preferably, the box body is further provided with an arc-shaped channel, and the control component includes a rotating shaft disposed in the arc-shaped channel and a stop block connected to the rotating shaft. The arc-shaped channel is provided with a plurality of PVA sheets, and a counterweight is provided at the bottom of one end of the stop block near the middle part of the box body. The bottom of the PVA sheet abuts against the bottom interior of the arc-shaped channel, and the top of the PVA sheet abuts against the bottom outer wall of the counterweight.

[0008] Furthermore, the position of the stop block corresponds to the oblique hole. In the initial state, the PVA sheet supports the stop block, so that the stop block blocks the oblique hole. When the stop block loses its support, the stop block rotates, so that the sealant placement cavity and the round hole are connected through the oblique hole.

[0009] Furthermore, the bottom inner wall of the arc-shaped channel is provided with a slot, the PVA sheet is inserted into the slot, a limiting block is also provided in the arc-shaped channel, the limiting block is placed at the bottom of the stop block, the top of the box is provided with an injection port, and the bottom of the box is provided with a through hole.

[0010] Furthermore, the sliding cylinder is also provided with a groove, the box body is disposed in the groove, two annular rubber pads are provided in the groove, the box body is disposed between the two annular rubber pads, and the end of the sliding cylinder away from the connecting cylinder is provided with a rounded corner.

[0011] Furthermore, the sealant placement cavity inside the box is also provided with two electrode plates. In the initial state, the electrode plates are immersed in the sealant in the sealant placement cavity. When the sealant in the sealant placement cavity flows, the electrode plates will be exposed. At this time, the conductivity of the electrode plates changes.

[0012] Preferably, the inner wall of the top of the connecting cylinder is provided with an arc block, the arc block is provided with a cavity, the connecting cylinder is provided with an injection port communicating with the cavity, the cavity is filled with powder material, the connecting cylinder is provided with a long groove, and a baffle is slidably connected in the long groove.

[0013] Furthermore, an inclined plate is fixedly provided on the outer wall of the end of the baffle away from the long groove, a first protrusion and a second protrusion are fixedly provided on the bottom of the baffle, and a locking block is provided on the sliding cylinder, the locking block being disposed between the first protrusion and the second protrusion.

[0014] Furthermore, the bottom inner wall of the connecting cylinder is provided with a support block, the top of the connecting cylinder is threadedly connected with a threaded rod, and the bottom of the threaded rod is provided with a pressure plate for fixing the lead wire.

[0015] Preferably, the end of the connecting cylinder away from the sliding cylinder is provided with a mounting ring, and the mounting ring is provided with multiple through grooves.

[0016] Compared with the prior art, the present invention provides a power battery NTC temperature sensor that resists copper migration, which has the following beneficial effects: 1. This copper migration-resistant NTC temperature sensor for power batteries uses epoxy resin encapsulation material to protect the leads, chip, and part of the connecting cylinder. A portion of the connecting cylinder is placed inside the epoxy resin encapsulation material, forming a tight fit. This epoxy resin encapsulation material provides protection for this part of the connecting cylinder and its connected components, thereby protecting the leads and preventing damage caused by direct contact between the leads and the epoxy resin encapsulation material after prolonged use. It also avoids unstable parallel resistance, solving the problem of false high-temperature alarms due to "low resistance and high temperature" in power battery NTC temperature sensors, and improving the overall service life of the battery.

[0017] 2. This anti-copper migration NTC temperature sensor for power batteries also includes a sealant placement cavity inside the sliding cylinder. When water flows into the sliding cylinder, the control components allow the sealant in the placement cavity to flow into the round hole through the oblique hole. Since the lead wire passes through the round hole during installation, the sealant can seal the lead wire and the round hole after it flows out, while preventing water from flowing through again, further ensuring the sealing and usage effect.

[0018] 3. This anti-copper migration NTC temperature sensor for power batteries, through the setting of a detection structure, helps to determine whether the sealant is flowing, reminding staff to conduct further inspections and improving the actual use effect.

[0019] 4. This anti-copper migration NTC temperature sensor for power batteries will cause the powder material inside the cavity to be discharged when the sliding cylinder moves. In case water seeps into the end of the sliding cylinder, it can further achieve the adsorption effect of water flow and achieve the blocking effect. The silica powder has good water absorption and can quickly absorb the intruding water, prevent water from penetrating further, and avoid moisture affecting use. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of a power battery NTC temperature sensor that resists copper migration, as proposed in this invention. Figure 2 This is a schematic diagram of the structure of a copper migration-resistant NTC temperature sensor for power batteries that does not contain epoxy resin encapsulation material, as proposed in this invention. Figure 3 This is a schematic diagram of the connecting cylinder and sliding cylinder in a power battery NTC temperature sensor for resisting copper migration proposed in this invention; Figure 4 This is a cross-sectional view of the connecting cylinder in an NTC temperature sensor for power batteries that resists copper migration, as proposed in this invention. Figure 1 ; Figure 5 This is a cross-sectional view of the connecting cylinder in an NTC temperature sensor for power batteries that resists copper migration, as proposed in this invention. Figure 2 ; Figure 6 This is a cross-sectional schematic diagram of the sliding cylinder in a power battery NTC temperature sensor for resisting copper migration proposed in this invention; Figure 7 This is a schematic diagram of the housing structure in a power battery NTC temperature sensor for resisting copper migration proposed in this invention; Figure 8 This is a front view of the housing in a power battery NTC temperature sensor for resisting copper migration proposed in this invention; Figure 9 This is a front sectional view of the connecting cylinder and sliding cylinder in a power battery NTC temperature sensor for resisting copper migration proposed in this invention. Figure 10 This invention proposes an anti-copper migration NTC temperature sensor for power batteries. Figure 9 Enlarged view of section A.

[0021] In the diagram: 1. Epoxy resin encapsulation material; 101. Lead wire; 102. Chip; 2. Connecting cylinder; 201. Arc block; 202. Support block; 203. Pressure plate; 204. Threaded rod; 205. Mounting ring; 3. Sliding cylinder; 301. Engaging block; 302. Rounded corner; 303. Groove; 304. Annular rubber pad; 4. Cavity; 401. Baffle; 402. Long groove; 403. Inclined plate ; 404, First protrusion; 405, Second protrusion; 406, Injection port; 5, Box body; 501, Sealant placement cavity; 502, Arc-shaped channel; 503, Round hole; 504, Rotating shaft; 505, Stop block; 506, Counterweight block; 507, Limiting block; 508, Slot; 509, PVA sheet; 510, Through hole; 511, Angled hole; 512, Electrode sheet; 513, Injection port. Detailed Implementation

[0022] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0023] In the description of this invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0024] Example 1: Reference Figures 1-9 A copper migration-resistant NTC temperature sensor for power batteries includes a lead wire 101 and a chip 102 connected to the end of the lead wire 101. It also includes a connecting cylinder 2 and an epoxy resin encapsulation material 1. The lead wire 101 is connected inside the connecting cylinder 2. The epoxy resin encapsulation material 1 encapsulates and protects the lead wire 101, the chip 102, and a portion of the connecting cylinder 2. The connecting cylinder 2 is partially embedded in the epoxy resin encapsulation material 1. A sliding cylinder 3 is slidably disposed inside the connecting cylinder 2. A housing 5 is fixedly disposed inside the sliding cylinder 3. The housing 5 has a circular hole 503 through which the lead wire 101 passes. A sealant placement cavity 501 is provided on the housing 5. An oblique hole 511 is provided between the sealant placement cavity 501 and the circular hole 503. A control component for controlling the opening and closing of the oblique hole 511 is also provided inside the housing 5.

[0025] In this embodiment, during use, the lead wire 101 is first passed through the connecting cylinder 2 and the sliding cylinder 3. The sliding cylinder 3 is then pulled to slide out of the connecting cylinder 2. At this time, the epoxy resin encapsulation material 1 encapsulates and protects part of the structure of the lead wire 101, the chip 102, and the connecting cylinder 2. The connecting cylinder 2 is partially embedded in the epoxy resin encapsulation material 1. Specifically, a part of the connecting cylinder 2 is placed inside the epoxy resin encapsulation material 1, forming a tight fit with the epoxy resin encapsulation material 1. The epoxy resin encapsulation material 1 is used to encapsulate and protect this part of the connecting cylinder 2 and the connected components, which can prevent cracks and thus prevent copper migration. This protects the lead wire 101 and prevents it from directly contacting the epoxy resin encapsulation material 1, which could lead to damage after long-term use. This provides initial protection for the lead wire 101 and prevents unstable parallel resistance. The other end of the connecting cylinder 2 is exposed and used for docking with other external structures or components.

[0026] Inside the sliding cylinder 3, there is also a box 5, which contains a sealant placement cavity 501 for placing sealant. When water flows into the sliding cylinder 3, the control component allows the sealant in the sealant placement cavity 501 to flow into the round hole 503 through the oblique hole 511. The lead wire 101 passes through the round hole 503 during installation. Therefore, when the sealant flows out, it can seal the lead wire 101 and the round hole 503, while preventing water from flowing through again, further ensuring the sealing and use effect.

[0027] Example 2: Reference Figure 1 , Figure 6 , Figure 7 and Figure 8 A copper migration-resistant NTC temperature sensor for power batteries is basically the same as in Embodiment 1. Furthermore, the housing 5 is also provided with an arc-shaped channel 502. The control component includes a rotating shaft 504 disposed in the arc-shaped channel 502 and a stop block 505 connected to the rotating shaft 504. Multiple PVA sheets 509 are disposed in the arc-shaped channel 502. A counterweight 506 is provided at the bottom of one end of the stop block 505 near the middle part of the housing 5. The bottom of the PVA sheet 509 abuts against the bottom interior of the arc-shaped channel 502, and the top of the PVA sheet 509 abuts against the bottom outer wall of the counterweight 506.

[0028] The position of the stop 505 corresponds to that of the inclined hole 511. In the initial state, the PVA sheet 509 supports the stop 505, so that the stop 505 blocks the inclined hole 511. When the stop 505 loses support, the stop 505 rotates, so that the sealant placement cavity 501 and the round hole 503 are connected through the inclined hole 511.

[0029] The bottom inner wall of the arc-shaped channel 502 is provided with a slot 508, and a PVA sheet 509 is inserted into the slot 508. The arc-shaped channel 502 is also provided with a limiting block 507, which is placed at the bottom of the stop block 505. The top of the box body 5 is provided with a glue injection port 513, and the bottom of the box body 5 is provided with a through hole 510.

[0030] In this embodiment, when water enters the end of the sliding cylinder 3, the water flows through the gap between the lead wire 101 and the sliding cylinder 3 into the groove 303, and then through the through hole 510 at the bottom of the box 5 into the box 5, and comes into contact with the PVA sheet 509. The PVA sheet 509 is a polyvinyl alcohol sheet, a widely used water-soluble polymer. PVA is obtained from polyvinyl acetate through an alcoholysis reaction. Its molecular chain contains a large number of hydroxyl groups, which are hydrophilic groups. From a molecular perspective, the hydroxyl groups on the PVA molecular chain can form hydrogen bonds with water molecules. Hydrogen bonds are a strong intermolecular force that enables a close connection between PVA molecules and water molecules. When the PVA sheet 509 comes into contact with water, water molecules gradually penetrate into the water. As water molecules continuously penetrate the interior of the PVA sheet 509, the tight structure that originally held together by intermolecular forces such as van der Waals forces is disrupted. The PVA molecules gradually dissociate from their original solid structure, disperse, and melt in the water. As the PVA sheet 509 melts, it falls downwards, losing its support for the stop block 505. At this point, under the action of the counterweight 506, the stop block 505 rotates on the rotating shaft 504 and gradually tilts. Then, the stop block 505 rotates to the position corresponding to the oblique hole 511. At this time, the sealant in the sealant placement cavity 501 enters the round hole 503 through the oblique hole 511, thereby sealing the lead wire 101 and effectively preventing water from seeping in again, thus protecting the sensor.

[0031] Reference Figure 6 The sliding cylinder 3 is also provided with a groove 303, and the box body 5 is set in the groove 303. Two annular rubber pads 304 are provided in the groove 303, and the box body 5 is set between the two annular rubber pads 304. The end of the sliding cylinder 3 away from the connecting cylinder 2 is provided with a rounded corner 302.

[0032] In this embodiment, two annular rubber pads 304 are also provided, which can limit the sealant flowing into the circular hole 503 to a certain extent, so that it can better complete the sealing effect. The annular rubber pads 304 have a certain elasticity, which can allow the lead wire 101 to pass through better. After the lead wire 101 passes through, the annular rubber pads 304 will wrap around the outer wall of the lead wire 101, which can form a preliminary seal and achieve a certain blocking effect. The rounded corners 302 can reduce the wear between the lead wire 101 and the sliding cylinder 3 and improve the service life.

[0033] Reference Figure 7 and Figure 8 The sealant placement cavity 501 inside the box 5 is also provided with two electrode plates 512. In the initial state, the electrode plates 512 are immersed in the sealant in the sealant placement cavity 501. When the sealant in the sealant placement cavity 501 flows, the electrode plates 512 will be exposed. At this time, the conductivity of the electrode plates 512 changes.

[0034] In this embodiment, sealant can be injected into the sealant placement cavity 501 through the provided injection port 513. After injection, the sealant will submerge the electrode sheet 512. The electrode sheet 512 is made of any material such as stainless steel, gold, platinum, or carbon. The sealant is a component room temperature vulcanizing silicone sealant or a two-component addition-type silicone sealant, which has extremely strong chemical inertness and excellent waterproof performance, and will not interact with the material of the electrode sheet 512.

[0035] In this application, two electrode plates 512 are provided, and the two electrode plates 512 are symmetrically arranged on both sides of the housing 5. The following method is used to detect whether the sealant is flowing: Step 1: Before the sealant flows, test the initial conductivity between the two electrode plates 512. Take three consecutive measurements and average them, with a 5-minute interval between each measurement to ensure data stability. The medium used is sealant. Record the results. and the corresponding impedance analyzer readings; Step 2: After a period of time, measure the conductivity between electrode plates 512. Similarly, take three consecutive measurements and average the results. The medium in this case is air. Step 3, set a threshold for conductivity change, i.e.:

[0036] When the conductivity is measured in real time With initial conductivity When the difference reaches or exceeds the threshold, it can be determined that the sealant has flowed. At this time, staff can be reminded to conduct further inspection to improve the actual use effect.

[0037] During measurement, a high-precision impedance analyzer (such as an Agilent 4294A impedance analyzer) is used for testing. The measurement frequency of the impedance analyzer is set, generally 1kHz, which can better reflect the electrical characteristics of the material. Then, the impedance value Z between the electrode plates 512 is read. Then, based on the geometric parameters of the electrode plates 512 (such as the distance L between the electrode plates 512 and the area A of the electrode plates 512), combined with the formula... The conductivity between the electrode plates 512 inside the sealant is calculated, where G represents the conductivity. The electrode plates 512 are square in shape for easy calculation.

[0038] Example 3: Refer to Figures 1-10 A copper migration-resistant NTC temperature sensor for power batteries includes a lead wire 101 and a chip 102 connected to the end of the lead wire 101. It also includes a connecting cylinder 2 and an epoxy resin encapsulation material 1. The lead wire 101 is connected inside the connecting cylinder 2. The epoxy resin encapsulation material 1 encapsulates and protects the lead wire 101, the chip 102, and a portion of the connecting cylinder 2. The connecting cylinder 2 is partially embedded in the epoxy resin encapsulation material 1. A sliding cylinder 3 is slidably disposed inside the connecting cylinder 2. A housing 5 is fixedly disposed inside the sliding cylinder 3. The housing 5 has a circular hole 503 through which the lead wire 101 passes. A sealant placement cavity 501 is provided on the housing 5. An oblique hole 511 is provided between the sealant placement cavity 501 and the circular hole 503. A control component for controlling the opening and closing of the oblique hole 511 is also provided inside the housing 5.

[0039] The inner wall of the top of the connecting cylinder 2 is provided with an arc block 201, and a cavity 4 is provided inside the arc block 201. The connecting cylinder 2 is provided with an injection port 406 that communicates with the cavity 4. The cavity 4 is filled with powder material. The connecting cylinder 2 is provided with a long groove 402, and a baffle 401 is slidably connected inside the long groove 402.

[0040] An inclined plate 403 is fixedly provided on the outer wall of the end of the baffle 401 away from the long groove 402. A first protrusion 404 and a second protrusion 405 are fixedly provided on the bottom of the baffle 401. A locking block 301 is provided on the sliding cylinder 3, and the locking block 301 is located between the first protrusion 404 and the second protrusion 405.

[0041] In this embodiment, powder material can be injected into the cavity 4 through the injection port 406. The powder material is specifically selected as silica gel powder, which has good water absorption and can quickly absorb the intruding water and prevent further water penetration. In this application, when the sliding cylinder 3 moves, it will drive the locking block 301 to move together. Since the locking block 301 is locked between the first protrusion 404 and the second protrusion 405, when it moves, it will drive the baffle 401 to move, thereby discharging the powder material in the cavity 4. The inclined plate 403 can make the powder material fall to the bottom of the connecting cylinder 2. In case water seeps into the end of the sliding cylinder 3, it can further achieve the water adsorption effect. Silica gel powder has good water absorption and can quickly absorb the intruding water and prevent further water penetration. At the same time, it avoids moisture affecting use. Moreover, there are certain gaps between the silica gel powder particles, so after absorbing water, it will not expand too much and put too much pressure on the lead wire 101, which is convenient to use.

[0042] The bottom inner wall of the connecting cylinder 2 is provided with a support block 202, and the top of the connecting cylinder 2 is threadedly connected with a threaded rod 204. The bottom of the threaded rod 204 is provided with a pressure plate 203 for fixing the lead wire 101.

[0043] Before encapsulating the epoxy resin encapsulation material 1, rotate the threaded rod 204 to move the pressure plate 203, thereby pressing the lead wire 101 and initially fixing the lead wire 101. The pressure plate 203 is equipped with a rubber pad to prevent damage to the lead wire 101. The threaded rod 204 is threadedly connected to the connecting cylinder 2 for better use.

[0044] The end of the connecting cylinder 2 away from the sliding cylinder 3 is provided with a mounting ring 205. The mounting ring 205 is provided with multiple through grooves. During encapsulation, the mounting ring 205 is also encapsulated in the epoxy resin encapsulation material 1. The encapsulation material can penetrate into the interior of the mounting ring 205 through the through grooves, thereby enhancing the stability of the encapsulation.

[0045] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A copper migration-resistant NTC temperature sensor for power batteries, comprising a lead (101) and a chip (102) connected to the end of the lead (101), characterized in that, Also includes: Connecting cylinder (2), the lead wire (101) is connected inside the connecting cylinder (2); Epoxy resin encapsulation material (1) encapsulates and protects part of the structure of lead wire (101), chip (102) and connecting tube (2), and the connecting tube (2) is partially embedded in the epoxy resin encapsulation material (1). A sliding cylinder (3) is slidably disposed inside a connecting cylinder (2). A box body (5) is fixedly disposed inside the sliding cylinder (3). A round hole (503) for the lead wire (101) to pass through is provided on the box body (5). A sealant placement cavity (501) is provided on the box body (5). An oblique hole (511) is provided between the sealant placement cavity (501) and the round hole (503). A control component for controlling the opening and closing of the oblique hole (511) is also provided inside the box body (5).

2. The NTC temperature sensor for a power battery with anti-copper migration according to claim 1, characterized in that, The box body (5) is also provided with an arc-shaped channel (502). The control component includes a rotating shaft (504) disposed in the arc-shaped channel (502) and a stop block (505) connected to the rotating shaft (504). The arc-shaped channel (502) is provided with a plurality of PVA sheets (509). The bottom of one end of the stop block (505) near the middle part of the box body (5) is provided with a counterweight (506). The bottom of the PVA sheet (509) abuts against the bottom interior of the arc-shaped channel (502), and the top of the PVA sheet (509) abuts against the bottom outer wall of the counterweight (506).

3. The NTC temperature sensor for a power battery with anti-copper migration according to claim 2, characterized in that, The position of the stop block (505) corresponds to that of the oblique hole (511). In the initial state, the PVA sheet (509) supports the stop block (505), so that the stop block (505) blocks the oblique hole (511). When the stop block (505) loses its support, the stop block (505) rotates, so that the sealant placement cavity (501) and the round hole (503) are connected through the oblique hole (511).

4. The NTC temperature sensor for a power battery with anti-copper migration according to claim 3, characterized in that, The bottom inner wall of the arc-shaped channel (502) is provided with a slot (508), and the PVA sheet (509) is inserted into the slot (508). The arc-shaped channel (502) is also provided with a limiting block (507), which is placed at the bottom of the stop block (505). The top of the box body (5) is provided with a glue injection port (513), and the bottom of the box body (5) is provided with a through hole (510).

5. A power battery NTC temperature sensor with anti-copper migration according to claim 4, characterized in that, The sliding cylinder (3) is also provided with a groove (303), the box body (5) is set in the groove (303), the groove (303) is provided with two annular rubber pads (304), the box body (5) is set between the two annular rubber pads (304), and the end of the sliding cylinder (3) away from the connecting cylinder (2) is provided with a rounded corner (302).

6. A power battery NTC temperature sensor with anti-copper migration according to claim 3, characterized in that, The sealant placement cavity (501) inside the box body (5) is also provided with two electrode plates (512). In the initial state, the electrode plates (512) are immersed in the sealant in the sealant placement cavity (501). When the sealant in the sealant placement cavity (501) flows, the electrode plates (512) will be exposed. At this time, the conductivity of the electrode plates (512) changes.

7. The NTC temperature sensor for a power battery with anti-copper migration according to claim 1, characterized in that, The inner wall of the top of the connecting cylinder (2) is provided with an arc block (201), and a cavity (4) is provided inside the arc block (201). The connecting cylinder (2) is provided with an injection port (406) that communicates with the cavity (4). The cavity (4) is filled with powder material. The connecting cylinder (2) is provided with a long groove (402), and a baffle (401) is slidably connected inside the long groove (402).

8. A power battery NTC temperature sensor with anti-copper migration according to claim 7, characterized in that, An inclined plate (403) is fixedly provided on the outer wall of the end of the baffle (401) away from the long groove (402). A first protrusion (404) and a second protrusion (405) are fixedly provided on the bottom of the baffle (401). A locking block (301) is provided on the sliding cylinder (3). The locking block (301) is located between the first protrusion (404) and the second protrusion (405).

9. A power battery NTC temperature sensor with anti-copper migration according to claim 8, characterized in that, The bottom inner wall of the connecting cylinder (2) is provided with a support block (202), the top of the connecting cylinder (2) is threaded with a threaded rod (204), and the bottom of the threaded rod (204) is provided with a pressure plate (203) for fixing the lead wire (101).

10. A power battery NTC temperature sensor with anti-copper migration according to claim 1, characterized in that, The connecting cylinder (2) is provided with an installation ring (205) at one end away from the sliding cylinder (3), and the installation ring (205) is provided with multiple through grooves.

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