Anti-copper migration power battery NTC temperature sensor

Abstract

The application discloses a copper-migration-resistant NTC temperature sensor for a power battery and belongs to the temperature sensor field. The copper-migration-resistant NTC temperature sensor for the power battery comprises a lead wire and a chip connected to the end of the lead wire, further comprises a connecting cylinder, and the lead wire is connected in the connecting cylinder; epoxy resin packaging material is used for packaging and protecting the partial structure of the lead wire, the chip and the connecting cylinder, and the connecting cylinder is partially embedded in the epoxy resin packaging material; a sliding cylinder is internally fixedly provided with a box body, the box body is provided with a sealant placing cavity, a slant hole is arranged between the sealant placing cavity and a circular hole, and the box body is further provided with a control assembly for controlling the opening and closing of the slant hole; the copper-migration-resistant NTC temperature sensor for the power battery can avoid the copper migration phenomenon, solve the problem that the NTC temperature sensor for the power battery appears in the "low resistance high temperature" false high temperature report, and improve the overall service life of the battery.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of temperature sensors, in particular to a power battery NTC temperature sensor resistant to copper migration. BACKGROUND

[0002] The NTC temperature sensor is composed of an NTC thermosensitive chip, a lead wire and a metal terminal or a connecting terminal, and the NTC thermosensitive chip is the core of the temperature sensor. The thermosensitive chip is a dense semiconductor ceramic formed by high-temperature sintering of manganese, cobalt, nickel, copper and other metal oxides, and the ceramic is attached with noble metal electrodes on both sides, and the resistance value thereof rapidly decreases with the increase of temperature.

[0003] When the NTC temperature sensor temperature rises, the resistance will decrease, and the relationship formula between the resistance and the temperature is as follows: , wherein represents the resistance value of the NTC thermistor at a certain temperature; represents the resistance value of the NTC thermistor at a rated temperature (reference temperature); represents the working temperature; represents the rated temperature (reference temperature); represents the material constant of the NTC thermistor, also known as the thermosensitive index; by using the characteristic, the corresponding temperature can be determined by measuring the resistance value, so as to realize the purpose of temperature detection and control.

[0004] At present, due to the factors such as temperature cycle and mechanical stress in the use environment of the power battery, for example, the temperature changes greatly during the charging and discharging process of the battery, the thermal expansion coefficients of the Duwe wire and other components are different, and the repeated thermal expansion and cold contraction will generate stress, and under the long-term action, the Duwe wire is prone to fracture or crack, so that the NTC temperature sensor is prone to copper (Cu) migration due to the crack, and a smaller resistance parallel model is formed, and the migration principle is that, at the cathode side, Cu 2+ or Cu + ion obtains electron reduction to Cu; at the anode side, Cu loses electrons to become Cu + or Cu 2+ due to factors such as moisture, and at the same time, the invasion of moisture also provides conditions for the electrochemical process, specifically, at the crack position, copper occurs electrochemical migration, the existence of dendrite and the formation of unstable parallel resistance between electrodes lead to the decrease of the overall resistance, thereby causing the problem of "low resistance high temperature" false high temperature of the power battery NTC temperature sensor, that is, the resistance value actually monitored by the battery management system is reduced, thereby falsely reporting high temperature, causing the BMS to incorrectly judge that the battery is in an overheating state, and then triggering the protection mechanism, thereby shortening the overall service life of the battery; therefore, the application is proposed. SUMMARY

[0005] The application aims at providing a copper migration resistant NTC temperature sensor for power battery.

[0006] In order to achieve the above-mentioned purpose, the application adopts the following technical scheme:

[0007] The application provides a copper migration resistant NTC temperature sensor for power battery, which comprises a lead wire and a chip connected to the end of the lead wire, and further comprises:

[0008] A connecting cylinder, wherein the lead wire is connected in the connecting cylinder;

[0009] An epoxy resin packaging material, wherein the epoxy resin packaging material is used for packaging and protecting the lead wire, the chip and part of the connecting cylinder, and the connecting cylinder is partially embedded in the epoxy resin packaging material;

[0010] A sliding cylinder, which is slidingly arranged in the connecting cylinder, wherein a box body is fixedly arranged in the sliding cylinder, a circular hole for the lead wire to pass through is arranged on the box body, a sealing glue placing cavity is arranged on the box body, an inclined hole is arranged between the sealing glue placing cavity and the circular hole, and a control assembly for controlling the opening and closing of the inclined hole is further arranged in the box body.

[0011] Preferably, an arc-shaped channel is further arranged on the box body, the control assembly comprises a rotating shaft arranged in the arc-shaped channel and a stop block connected to the rotating shaft, a plurality of PVA sheets are arranged in the arc-shaped channel, a counterweight is arranged at the bottom of one end of the stop block close to the middle part of the box body, the bottom of the PVA sheet abuts against the inner bottom of the arc-shaped channel, and the top of the PVA sheet abuts against the outer wall of the bottom of the counterweight.

[0012] Further, the stop block corresponds to the position of the inclined hole, in the initial state, the PVA sheet supports the stop block, so that the stop block blocks the inclined hole, and when the stop block loses the support, the stop block rotates, so that the sealing glue placing cavity and the circular hole are communicated through the inclined hole.

[0013] Further, the inner wall of the bottom of the arc-shaped channel is provided with a slot, the PVA sheet is inserted into the slot, a limiting block is further arranged in the arc-shaped channel, the limiting block is arranged at the bottom of the stop block, an injection port is arranged at the top of the box body, and a through hole is arranged at the bottom of the box body.

[0014] Further, a groove is further arranged on the sliding cylinder, the box body is arranged in the groove, two annular rubber pads are arranged in the groove, the box body is arranged between the two annular rubber pads, and a round corner is arranged at the end of the sliding cylinder away from the connecting cylinder.

[0015] Further, two electrode sheets are arranged in the sealing glue placing cavity in the box body, and the electrode sheets are soaked in the sealing glue in the sealing glue placing cavity in the initial state, and the electrode sheets are exposed when the sealing glue in the sealing glue placing cavity flows, and the conductivity of the electrode sheets changes.

[0016] Preferably, the top inner wall of the connecting cylinder is provided with a circular arc block, the circular arc block is internally provided with a cavity, the connecting cylinder is provided with a material injection opening in communication with the cavity, the cavity is filled with a powder material, and the connecting cylinder is provided with a long slot, and a baffle is slidably connected in the long slot.

[0017] Further, the end wall of the baffle away from the long slot is fixedly provided with an inclined plate, the bottom of the baffle is fixedly provided with a first protruding block and a second protruding block, and a clamping block is arranged on the sliding cylinder and located between the first protruding block and the second protruding block.

[0018] Further, the bottom inner wall of the connecting cylinder is provided with a supporting block, and a threaded rod is threadedly connected to the top of the connecting cylinder, and the bottom of the threaded rod is provided with a pressing plate for fixing the lead wire.

[0019] Preferably, the end of the connecting cylinder away from the sliding cylinder is provided with a mounting ring, and a plurality of through grooves are arranged on the mounting ring.

[0020] Compared with the prior art, the application provides an anti-copper migration power battery NTC temperature sensor, which has the following beneficial effects:

[0021] 1. The anti-copper migration power battery NTC temperature sensor, by encapsulating and protecting the lead wire, the chip and part of the connecting cylinder by the epoxy resin packaging material, part of the connecting cylinder is placed in the epoxy resin packaging material and tightly cooperates with the epoxy resin packaging material, so as to realize the encapsulation and protection of the part of the connecting cylinder and the connected components by the epoxy resin packaging material, thereby protecting the lead wire, avoiding the direct contact of the lead wire with the epoxy resin packaging material, preventing the lead wire from being damaged after long-term use, avoiding the generation of unstable parallel resistance, solving the problem of false high temperature of the power battery NTC temperature sensor appearing "low resistance high temperature", and improving the overall service life of the battery.

[0022] 2. The anti-copper migration power battery NTC temperature sensor, by further arranging a sealing glue placing cavity in the sliding cylinder, when water flows into the sliding cylinder, the sealing glue in the sealing glue placing cavity can flow into the circular hole through the inclined hole by the control assembly, and the lead wire is installed through the circular hole, so that the encapsulation between the lead wire and the circular hole can be realized after the sealing glue flows out, and the water flow is prevented from passing through again, thereby further ensuring the encapsulation and use effect.

[0023] 3. The copper migration resistant power battery NTC temperature sensor, by setting the detection structure, whether the sealing glue flows is assisted to judge, the staff is reminded to carry out further inspection, improves the actual use effect.

[0024] 4. The copper migration resistant power battery NTC temperature sensor, when the sliding cylinder moves, the powder material in the cavity is discharged, if the end of the sliding cylinder is infiltrated, the adsorption effect of water flow can be further realized, the blocking effect is realized, the silica gel powder has good water absorption, can quickly absorb the invading moisture, prevent the moisture from further penetrating, and avoid the influence of humidity on use. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 The structure diagram of the copper migration resistant power battery NTC temperature sensor is provided for the present application;

[0026] Figure 2 The structure diagram of the copper migration resistant power battery NTC temperature sensor is provided for the present application;

[0027] Figure 3 The structure diagram of the copper migration resistant power battery NTC temperature sensor is provided for the present application;

[0028] Figure 4 The structure diagram of the copper migration resistant power battery NTC temperature sensor is provided for the present application; Figure 1 ;

[0029] Figure 5 The structure diagram of the copper migration resistant power battery NTC temperature sensor is provided for the present application; Figure 2 ;

[0030] Figure 6 The structure diagram of the copper migration resistant power battery NTC temperature sensor is provided for the present application;

[0031] Figure 7 The structure diagram of the copper migration resistant power battery NTC temperature sensor is provided for the present application;

[0032] Figure 8 The structure diagram of the copper migration resistant power battery NTC temperature sensor is provided for the present application;

[0033] Figure 9 The structure diagram of the copper migration resistant power battery NTC temperature sensor is provided for the present application;

[0034] Figure 10A copper migration resistant NTC temperature sensor for a power battery Figure 9 Enlarged view of part A.

[0035] In the figure: 1, epoxy resin packaging material; 101, lead; 102, chip; 2, connecting cylinder; 201, circular arc block; 202, support block; 203, pressing plate; 204, threaded rod; 205, mounting ring; 3, sliding cylinder; 301, clamping block; 302, round corner; 303, groove; 304, annular rubber pad; 4, cavity; 401, baffle; 402, long slot; 403, inclined plate; 404, first protrusion; 405, second protrusion; 406, pouring port; 5, box body; 501, sealant placement cavity; 502, arc-shaped channel; 503, circular hole; 504, shaft; 505, stop block; 506, counterweight block; 507, limiting block; 508, insertion slot; 509, PVA sheet; 510, through hole; 511, inclined hole; 512, electrode sheet; 513, glue injection port. DETAILED DESCRIPTION

[0036] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, not all.

[0037] In the description of the present application, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0038] Embodiment one:

[0039] Reference Figures 1-9 A copper migration resistant NTC temperature sensor for a power battery, comprising a lead 101 and a chip 102 connected to the end of the lead 101, further comprising a connecting cylinder 2 and an epoxy resin packaging material 1, the lead 101 is connected in the connecting cylinder 2, the epoxy resin packaging material 1 encapsulates and protects the lead 101, the chip 102 and part of the structure of the connecting cylinder 2, the connecting cylinder 2 is in a setting state of being partially embedded in the epoxy resin packaging material 1; a sliding cylinder 3 is slidingly arranged in the connecting cylinder 2, a box body 5 is fixedly arranged in the sliding cylinder 3, the box body 5 is provided with a circular hole 503 through which the lead 101 passes, the box body 5 is provided with a sealant placement cavity 501, an inclined hole 511 is arranged between the sealant placement cavity 501 and the circular hole 503, and a control assembly for controlling the opening and closing of the inclined hole 511 is further arranged in the box body 5.

[0040] In this embodiment, in use, first, the lead wire 101 is passed through the connecting cylinder 2 and the sliding cylinder 3, the sliding cylinder 3 is pulled to slide out of the connecting cylinder 2, at this time, the lead wire 101, the chip 102 and part of the structure of the connecting cylinder 2 are encapsulated and protected by the epoxy resin encapsulating material 1, the connecting cylinder 2 is in a setting state of being partially embedded in the epoxy resin encapsulating material 1, specifically, part of the connecting cylinder 2 is placed in the epoxy resin encapsulating material 1 and tightly cooperates with the epoxy resin encapsulating material 1 to realize encapsulation and protection of the part of the connecting cylinder 2 and the components connected thereto by means of the epoxy resin encapsulating material 1, which can avoid cracks and copper migration, thereby protecting the lead wire 101, avoiding damage caused by direct contact between the lead wire 101 and the epoxy resin encapsulating material 1 after long-term use, preliminarily protecting the lead wire 101 and avoiding unstable parallel resistance; the other end of the connecting cylinder 2 is exposed outside for docking with other structures or components.

[0041] The sliding cylinder 3 is further provided with a box body 5, the box body 5 is provided with a sealant placing cavity 501 for placing sealant, when water flows into the sliding cylinder 3, the sealant in the sealant placing cavity 501 can flow into the circular hole 503 through the inclined hole 511 by the control assembly, and the lead wire 101 is installed through the circular hole 503, therefore, when the sealant flows out, encapsulation between the lead wire 101 and the circular hole 503 can be realized, and the water flow is blocked from passing again, further ensuring the encapsulation and use effect.

[0042] Embodiment two:

[0043] Referring to Figure 1 , Figure 6 , Figure 7 and Figure 8 , the anti-copper migration power battery NTC temperature sensor is basically the same as that in embodiment one, and further, the box body 5 is further provided with an arc-shaped channel 502, the control assembly includes a rotating shaft 504 arranged in the arc-shaped channel 502 and a stop block 505 connected to the rotating shaft 504, a plurality of PVA sheets 509 are arranged in the arc-shaped channel 502, the stop block 505 is provided with a counterweight 506 at one end of the bottom close to the middle part of the box body 5, the bottom of the PVA sheet 509 abuts against the inside of the bottom of the arc-shaped channel 502, and the top of the PVA sheet 509 abuts against the outer wall of the bottom of the counterweight 506.

[0044] The stop block 505 corresponds to the position of the inclined hole 511, in the initial state, the PVA sheet 509 supports the stop block 505, so that the stop block 505 blocks the inclined hole 511, when the stop block 505 loses the support, the stop block 505 rotates to make the sealant placing cavity 501 and the circular hole 503 communicate through the inclined hole 511.

[0045] The inner wall of the bottom 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 further provided with a limiting block 507 arranged 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.

[0046] In this embodiment, when the end of the sliding cylinder 3 enters the water flow, the water flow enters the groove 303 through the gap between the lead wire 101 and the sliding cylinder 3, then enters the box body 5 through the through hole 510 at the bottom of the box body 5, and contacts the PVA sheet 509. The PVA sheet 509 is a polyvinyl alcohol sheet, which is a widely used water-soluble polymer. PVA is prepared by alcoholysis of polyvinyl acetate. There are a large number of hydroxyl groups on the molecular chain. From the molecular level, the hydroxyl groups on the PVA molecular chain can form hydrogen bonds with water molecules. Hydrogen bond is a strong intermolecular force, which can make the PVA molecules and water molecules closely connected. When the PVA sheet 509 contacts water, water molecules will gradually penetrate into the interior of the PVA sheet 509. With the continuous penetration of water molecules, the close structure of PVA molecules maintained by intermolecular forces such as van der Waals force is destroyed, and PVA molecules gradually dissociate from the original solid structure and disperse into water. At this time, the PVA sheet 509 will fall down after melting, thereby losing the support of the stop block 505. At this time, under the action of the counterweight block 506, the stop block 505 will rotate on the rotating shaft 504 and gradually tilt. Then the stop block 505 will rotate to a position corresponding to the inclined hole 511. At this time, the sealant in the sealant storage cavity 501 will enter the circular hole 503 through the inclined hole 511, thereby sealing the lead wire 101, effectively blocking the re-entry of water flow, and protecting the sensor.

[0047] Referring to Figure 6 , the sliding cylinder 3 is further provided with a groove 303, and the box body 5 is arranged in the groove 303. The groove 303 is provided with two annular rubber pads 304, and the box body 5 is arranged between the two annular rubber pads 304. The end of the sliding cylinder 3 away from the connecting cylinder 2 is provided with a round corner 302.

[0048] In this embodiment, two annular rubber pads 304 are further provided, which can limit the sealant flowing into the circular hole 503, so that the sealant can better complete the packaging effect. The annular rubber pads 304 have a certain elasticity, which can make the lead wire 101 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 round corner 302 can reduce the wear between the lead wire 101 and the sliding cylinder 3, thereby improving the service life.

[0049] Referring toFigure 7 and Figure 8 Two electrode sheets 512 are also arranged in the sealing glue placement cavity 501 in the box body 5. In the initial state, the electrode sheets 512 are soaked in the sealing glue in the sealing glue placement cavity 501. When the sealing glue in the sealing glue placement cavity 501 flows, the electrode sheets 512 are exposed. At this time, the electrical conductivity of the electrode sheets 512 changes.

[0050] In this embodiment, the sealing glue placement cavity 501 is arranged with a glue injection port 513, through which the sealing glue can be injected into the sealing glue placement cavity 501. The sealing glue can immerse the electrode sheets 512 after being injected. The material of the electrode sheets 512 is any one of stainless steel, gold, platinum, and carbon. The sealing glue is a two-component addition type silicone sealant, which has strong chemical inertness and excellent waterproofness and will not interact with the material of the electrode sheets 512.

[0051] In this application, two electrode sheets 512 are arranged, which are symmetrically arranged on the two surfaces of the box body 5. When judging whether the sealing glue flows, the following scheme is used for detection:

[0052] Step one, when the sealing glue does not flow, the initial electrical conductivity between the two electrode sheets 512 is tested first The average value is taken by continuously measuring three times with an interval of 5 minutes each time to ensure that the data is stable. At this time, the medium is the sealing glue, and the and the corresponding impedance analyzer reading are recorded;

[0053] Step two, after a period of time, the electrical conductivity between the electrode sheets 512 is measured The average value is taken by continuously measuring three times. At this time, the medium is air;

[0054] Step three, a conductivity change threshold is set, that is:

[0055]

[0056] When the difference between the real-time measured electrical conductivity and the initial electrical conductivity reaches or exceeds the threshold, it can be determined that the sealing glue has flowed. At this time, the staff can be reminded to further check, thereby improving the actual use effect.

[0057] When measuring, a high-precision impedance analyzer (such as Agilent 4294A impedance analyzer) is used for testing. The measurement frequency of the impedance analyzer is set, which can generally be selected as 1 kHz. At this frequency, the electrical characteristics of the material can be better reflected. Then the impedance value Z between the electrode sheets 512 is read. Then, according to the geometric parameters of the electrode sheets 512 (such as the distance L between the electrode sheets 512 and the area A of the electrode sheets 512), the formula The conductance between the electrode pieces 512 in the sealant is calculated, where G represents the conductance. The electrode pieces 512 are square in shape, which facilitates calculation.

[0058] Embodiment three: refer to Figures 1-10 The anti-copper migration power battery NTC temperature sensor comprises a lead wire 101 and a chip 102 connected at the end of the lead wire 101, and further comprises a connecting cylinder 2 and an epoxy resin packaging material 1, the lead wire 101 is connected in the connecting cylinder 2, the epoxy resin packaging material 1 encapsulates and protects the lead wire 101, the chip 102 and part of the structure of the connecting cylinder 2, and the connecting cylinder 2 is arranged in a state of being partially embedded in the epoxy resin packaging material 1; a sliding cylinder 3 is arranged in the connecting cylinder 2 in a sliding mode, the sliding cylinder 3 is fixedly provided with a box body 5, the box body 5 is provided with a circular hole 503 through which the lead wire 101 passes, the box body 5 is provided with a sealant placing cavity 501, and a slanted hole 511 is arranged between the sealant placing cavity 501 and the circular hole 503; and the box body 5 is further provided with a control assembly for controlling the opening and closing of the slanted hole 511.

[0059] An arc block 201 is arranged on the inner wall of the top of the connecting cylinder 2, a cavity 4 is arranged in the arc block 201, the connecting cylinder 2 is provided with a pouring opening 406 in communication with the cavity 4, the cavity 4 is filled with powder material, and the connecting cylinder 2 is provided with a long groove 402, and a baffle 401 is slidably connected in the long groove 402.

[0060] A slanted plate 403 is fixedly arranged on the outer wall of the end of the baffle 401 away from the long groove 402, a first protruding block 404 and a second protruding block 405 are fixedly arranged on the bottom of the baffle 401, and a clamping block 301 is arranged on the sliding cylinder 3 and located between the first protruding block 404 and the second protruding block 405.

[0061] In this embodiment, the pouring opening 406 is arranged to inject powder material into the cavity 4, and the powder material is specifically selected as silica gel powder, which has good water absorption and can quickly absorb the invading water and prevent further penetration of water. In this application, when the sliding cylinder 3 moves, the clamping block 301 moves together, and since the clamping block 301 is clamped between the first protruding block 404 and the second protruding block 405, the clamping block 301 moves, thereby driving the baffle 401 to move, so that the powder material in the cavity 4 is discharged. The slanted plate 403 can make the powder material fall to the bottom of the connecting cylinder 2. In case of water seepage at the end of the sliding cylinder 3, the silica gel powder can further achieve the effect of absorbing water. The silica gel powder has good water absorption and can quickly absorb the invading water to prevent further penetration of water. At the same time, the silica gel powder particles have certain gaps, and after absorbing water, they will not expand too much to generate a large pressure on the lead wire 101, thereby facilitating use.

[0062] The inner wall of the bottom of the connecting cylinder 2 is provided with a supporting 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 pressing plate 203 for fixing the lead wire 101.

[0063] Before the epoxy resin packaging material 1 is packaged, the threaded rod 204 is rotated to drive the pressing plate 203 to move, so as to compress the lead wire 101, the lead wire 101 can be preliminarily fixed, the pressing plate 203 is provided with a rubber pad, the lead wire 101 is prevented from being damaged, and the threaded rod 204 is threadedly connected with the connecting cylinder 2, and the threaded rod 204 can be better used.

[0064] The end, away from the sliding cylinder 3, of the connecting cylinder 2 is provided with a mounting ring 205, the mounting ring 205 is provided with a plurality of through grooves, during packaging, the mounting ring 205 is also packaged in the epoxy resin packaging material 1, and the through grooves can enable the packaging material to penetrate into the inside of the mounting ring 205, and the stability of packaging is enhanced.

[0065] The above is only a preferred specific embodiment of the present application, but the protection scope of the present application is not limited to this, any person skilled in the art can make equivalent replacement or change according to the technical scheme and the inventive concept of the present application within the technical range disclosed by the present application, and all of them should be covered in the protection scope of the present application.

Claims

1. A power battery NTC temperature sensor resistant to copper migration, comprising a lead wire (101) and a chip (102) connected at the end of the lead wire (101), characterized in that, Also include: The connecting barrel (2), the lead wire (101) is connected in the connecting barrel (2); Epoxy resin packaging material (1), the epoxy resin packaging material (1) is encapsulated and protected to the lead wire (101), chip (102) and the partial structure of connecting barrel (2), the connecting barrel (2) is partially embedded in the setting state of epoxy resin packaging material (1); The sliding barrel (3) is slidably arranged in the connecting barrel (2), the sliding barrel (3) is fixedly provided with a box body (5) in it, the box body (5) is provided with a circular hole (503) for the lead wire (101) to pass through, the box body (5) is provided with a sealant placing cavity (501), and the sealant placing cavity (501) and the circular hole (503) are provided with an inclined hole (511), and the box body (5) is further provided with a control assembly for controlling the opening and closing of the inclined hole (511) in it; The box body (5) is further provided with an arc-shaped channel (502), the control assembly comprises a rotating shaft (504) arranged in the arc-shaped channel (502) and a stop block (505) connected to the rotating shaft (504), a plurality of PVA sheets (509) are arranged in the arc-shaped channel (502), one end of the stop block (505) close to the middle part of the box body (5) is provided with a counterweight (506), the bottom of the PVA sheet (509) abuts against the inside of the bottom of the arc-shaped channel (502), and the top of the PVA sheet (509) abuts against the bottom outer wall of the counterweight (506); The position of the stop block (505) corresponds to the inclined hole (511), in the initial state, the PVA sheet (509) supports the stop block (505), so that the stop block (505) blocks the inclined hole (511), when the stop block (505) loses support, the stop block (505) rotates, so that the sealant placing cavity (501) and the circular hole (503) are communicated through the inclined hole (511); The bottom inner wall of the arc-shaped channel (502) is provided with a slot (508), the PVA sheet (509) is inserted into the slot (508), and the arc-shaped channel (502) is further provided with a limiting block (507), the limiting block (507) is arranged 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).

2. The anti-copper migration NTC temperature sensor for power battery according to claim 1, characterized in that, The sliding barrel (3) is further provided with a groove (303), the box body (5) is arranged in the groove (303), two annular rubber pads (304) are arranged in the groove (303), the box body (5) is arranged between the two annular rubber pads (304), and the end of the sliding barrel (3) away from the connecting barrel (2) is provided with a round corner (302).

3. The anti-copper migration NTC temperature sensor for power battery according to claim 1, characterized in that, The sealant placing cavity (501) in the box body (5) is further provided with two electrode sheets (512), in the initial state, the electrode sheet (512) is soaked in the sealant in the sealant placing cavity (501), when the sealant in the sealant placing cavity (501) flows, the electrode sheet (512) is exposed, at this time, the electrical conductivity of the electrode sheet (512) changes.

4. The anti-copper migration NTC temperature sensor for power battery 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), the arc block (201) is internally provided with a cavity (4), the connecting cylinder (2) is provided with a material injection opening (406) in communication with the cavity (4), the cavity (4) is filled with a powder material, and the connecting cylinder (2) is provided with a long slot (402), and the long slot (402) is slidably connected with a baffle (401).

5. The anti-copper migration NTC temperature sensor for power battery according to claim 4, characterized in that, The outer wall of the end of the baffle (401) away from the long slot (402) is fixedly provided with an inclined plate (403), the bottom of the baffle (401) is fixedly provided with a first protruding block (404) and a second protruding block (405), the sliding cylinder (3) is provided with a clamping block (301), and the clamping block (301) is arranged between the first protruding block (404) and the second protruding block (405).

6. The anti-copper migration NTC temperature sensor for power battery according to claim 5, characterized in that, The bottom inner wall of the connecting cylinder (2) is provided with a supporting block (202), the top of the connecting cylinder (2) is threadedly connected with a threaded rod (204), and the bottom of the threaded rod (204) is provided with a pressing plate (203) for fixing a lead wire (101).

7. The anti-copper migration NTC temperature sensor for power battery according to claim 1, characterized in that, The end of the connecting cylinder (2) away from the sliding cylinder (3) is provided with a mounting ring (205), and the mounting ring (205) is provided with a plurality of through grooves.

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