Gradient aging equipment and process for thin-film capacitor for electric automobile

Abstract

The invention discloses gradient aging equipment and process for a thin-film capacitor for an electric vehicle, and belongs to the field of capacitor aging. A gradient aging device for thin film capacitors for electric vehicles comprises a test box and an aging vehicle body connected in the test box, the aging vehicle body is provided with a plurality of layers, each layer of aging vehicle body is provided with an insulating plate, each insulating plate is connected with a plurality of partition plates, and a capacitor body is placed between every two adjacent partition plates; the plurality of current sampling ends and the plurality of PCB high-voltage ends are matched with the capacitor body and are arranged at the bottom of the insulating plate; the fixed block is fixedly arranged in the test box, and a first socket is arranged on the fixed block; the vertical plate is fixedly arranged on the aging vehicle body, and a second socket is arranged on the vertical plate; according to the invention, the aging test can be carried out on the capacitor body, the product performance can be better analyzed, the capacitor with defects in the body can be screened out in advance, and the problem of early failure in the use process of the capacitor is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of capacitor aging, and in particular to a gradient aging device and process for a film capacitor for an electric vehicle. Background Art

[0002] Film capacitors for electric vehicles are high-performance capacitors designed specifically for electric vehicles and new energy vehicles. They have high energy density, low internal resistance, excellent temperature and frequency characteristics, and long service life. They can withstand high voltage and high current to meet the needs of high-power and fast charging and discharging of electric vehicles. They are an important part of the electric vehicle field and help improve the overall performance and reliability of electric vehicles.

[0003] High-temperature aging of electronic products can expose in advance the material and process defects of components in the production process, thereby improving the stability and reliability of electronic products. High-temperature aging of film capacitors is achieved by performing a DC aging test on the capacitors under the maximum rated operating conditions. In a high-temperature and high-humidity environment, the dielectric and electrodes of film capacitors will age quickly, resulting in greater losses, so as to expose and eliminate those capacitor products that are defective due to improper process control or defects in the manufacturing process. However, the related gradient aging equipment for film capacitors for electric vehicles is relatively scarce in the prior art. In view of this, the present invention is specially proposed. Summary of the invention

[0004] The purpose of the present invention is to solve the problems existing in the prior art and to propose a gradient aging device and process for film capacitors for electric vehicles.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] A film capacitor gradient aging device for electric vehicles, comprising a test box and:

[0007] An aging car body connected to the test box, wherein the aging car body has multiple layers, each layer of the aging car body is provided with an insulating plate, each insulating plate is connected to a plurality of partitions, and a capacitor body is placed between two adjacent partitions;

[0008] A plurality of current sampling terminals and a plurality of PCB high voltage terminals matched with the capacitor body are arranged at the bottom of the insulating plate;

[0009] A fixed block, fixedly arranged in the test box, wherein the fixed block is provided with a first socket;

[0010] The vertical plate is fixedly arranged on the aging vehicle body, and a second socket is arranged on the vertical plate.

[0011] Preferably, a first fixed plate and a second fixed plate are fixedly connected to the aging body, a first sliding rod is slidably connected to the first fixed plate, a sliding block is slidably connected to the top of the aging body, the first sliding rod abuts against an outer wall of the sliding block, and a push plate is provided on the outer wall of the sliding block.

[0012] Furthermore, a support plate is provided on the vertical plate, a rotating shaft is rotatably connected to the support plate, a cover plate is fixedly connected to the rotating shaft, the cover plate cooperates with the second socket, a pinion is also provided on the rotating shaft, and gear teeth meshing with the pinion are provided on the push plate.

[0013] Furthermore, the slider is provided with a limit rod, the limit rod is sleeved with a first spring, the first spring is arranged between the slider and the vertical plate, the limit rod is slidably connected to the vertical plate, a stop block is provided at one end of the limit rod outside the vertical plate, a first baffle is fixedly connected to the outer wall of the first sliding rod, and a second spring is connected between the first baffle and the first fixed plate.

[0014] Preferably, two long grooves are provided on the insulating plate between two adjacent partitions, a first slide plate and a second slide plate are slidably connected in the two long grooves respectively, and a first clamping plate and a second clamping plate are fixedly connected to the first slide plate and the second slide plate respectively.

[0015] Furthermore, the second sliding rod is fixedly connected to a vertical plate, the vertical plate is provided with a thin rod, the thin rod is slidably connected to a first connecting block, the first sliding plate is fixedly connected to the first connecting block, an elastic member is provided between the vertical plate and the first connecting block, and the elastic member is sleeved on the outer wall of the thin rod.

[0016] Furthermore, a tooth block is provided on the outer wall of the second sliding rod, an auxiliary gear is rotatably connected in the second fixed plate, the tooth block is meshed with the bottom of the auxiliary gear, a rack plate is slidably connected in the second fixed plate, the rack plate is meshed with the top of the auxiliary gear, a second connecting block is fixedly connected to the rack plate, and the second connecting block is fixedly connected to the second slide plate.

[0017] Furthermore, a second sliding rod is slidably connected in the second fixed plate, a second baffle and a third baffle are respectively provided at both ends of the second sliding rod, a third spring is provided between the second baffle and the aging car body, a fourth spring is provided between the third baffle and the aging car body, and the third spring and the fourth spring are both sleeved on the outer wall of the second sliding rod.

[0018] Preferably, a roller is provided at the bottom of the aging body, a handrail is fixedly connected to the outer wall of the aging body, a slide groove is provided on the bottom inner wall of the test box, the roller is rollingly connected in the slide groove, and a revolving door is rotatably connected to the test box.

[0019] A gradient aging process for film capacitors for electric vehicles is performed using the following steps:

[0020] S1, first place the capacitor body to be subjected to the aging test on the insulating board, and place a capacitor body between every two adjacent partitions;

[0021] S2, connecting the corresponding current sampling terminals to the high voltage terminals of the PCB, and the high voltage terminals of the PCB are respectively connected to the corresponding capacitor bodies through wires;

[0022] S3, push the aged vehicle bodies into the test chambers, and three aged vehicle bodies are placed in each test chamber;

[0023] S4, set the aging temperature, aging voltage and protection leakage current of the first stage. The aging temperature is raised from room temperature to 95°C within 0.5 hours, and then kept at a constant temperature for 2 hours; the aging voltage is the rated voltage Un; the protection leakage current is ≤12uA / uF;

[0024] S5, set the aging temperature, aging voltage and protection leakage current of the second stage; the aging temperature is increased from 95℃ to 105℃ within 0.5H and then kept at a constant temperature for 3H; the aging voltage is the rated voltage Un or (0.85-0.9)*Un, and the voltage derating range is determined according to the design voltage margin; the protection leakage current is ≤12uA / uF.

[0025] Compared with the prior art, the present invention provides a gradient aging device and process for film capacitors for electric vehicles, which has the following beneficial effects:

[0026] 1. The gradient aging equipment for film capacitors for electric vehicles places multiple capacitor bodies that need to be aged between adjacent partitions, and then connects the capacitor bodies to the PCB high-voltage end at the bottom of the insulating plate through wires. After the aging vehicle is pushed into the test box, the aging test operation can be carried out. It can trace the test data of the product and intuitively understand the dynamic change process of the product parameters, better analyze the product performance, screen out capacitors with defects in the body itself in advance, and solve the problem of early failure of the capacitor during use.

[0027] 2. The gradient aging equipment for film capacitors for electric vehicles pushes the aging body into the test box, so that the first slide bar and the second slide bar on the aging body start to move. When the first slide bar moves, the first cover plate no longer blocks the second socket, so that the second socket is opened, and then the second socket can be connected to the main connector on the control end through a connecting line to achieve electrical connection. The cover plate can prevent dust and impurities from entering the second socket, thereby affecting the insertion effect and use effect of the second socket, thereby improving the convenience of operation.

[0028] 3. The gradient aging equipment for film capacitors for electric vehicles pushes the aging body into the test box, so that the first slide bar and the second slide bar on the aging body start to move. When the second slide bar moves, it can simultaneously push the first clamping plate and the second clamping plate to start moving, so that the first clamping plate and the second clamping plate cooperate with each other to clamp the capacitor body, which can prevent the capacitor body from falling, protect the capacitor body, and ensure the accuracy and reliability of the test. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 This is a schematic diagram of the structure of a gradient aging device for film capacitors for electric vehicles proposed by the present invention;

[0030] Figure 2 This is a schematic diagram of the structure of a test box in a gradient aging device for film capacitors for electric vehicles proposed by the present invention. Figure 1 ;

[0031] Figure 3 This is a schematic diagram of the structure of a test box in a gradient aging device for film capacitors for electric vehicles proposed by the present invention. Figure 2 ;

[0032] Figure 4 The structure of the aging vehicle body in the gradient aging equipment for film capacitors for electric vehicles proposed by the present invention is shown in FIG. Figure 1 ;

[0033] Figure 5 The structure of the aging vehicle body in the gradient aging equipment for film capacitors for electric vehicles proposed by the present invention is shown in FIG. Figure 2 ;

[0034] Figure 6 A gradient aging device for film capacitors for electric vehicles proposed by the present invention Figure 4 A magnified view of part A;

[0035] Figure 7 A cross-sectional schematic diagram of a vertical plate in a gradient aging device for a film capacitor for electric vehicles proposed by the present invention;

[0036] Figure 8 This is a front view of an aging vehicle body in a gradient aging device for film capacitors for electric vehicles proposed by the present invention;

[0037] Fig. 9 A gradient aging device for film capacitors for electric vehicles proposed by the present invention Figure 8 A magnified view of part B;

[0038] Fig.10 A gradient aging device for film capacitors for electric vehicles proposed by the present invention Figure 8 Enlarged view of part C;

[0039] Fig.11 This is a structural schematic diagram of a first slide bar and a second slide bar in a gradient aging device for a film capacitor for an electric vehicle proposed by the present invention;

[0040] Fig.12 A cross-sectional schematic diagram of an aging vehicle body in a gradient aging device for film capacitors for electric vehicles proposed by the present invention;

[0041] Fig.13 This is a circuit structure diagram of an aging vehicle body in a film capacitor gradient aging device for electric vehicles proposed by the present invention.

[0042] In the figure: 1. test box; 101. control end; 102. rotating door; 103. slide; 104. fixed block; 105. first socket; 2. aging body; 201. roller; 202. insulating plate; 203. partition; 204. first clamping plate; 205. second clamping plate; 206. long groove; 207. vertical plate; 208. second socket; 209. handrail; 210. current sampling end; 211. PCB high voltage end; 3. first slide bar; 301. first fixed plate; 302. slider; 303. push plate; 304. support plate; 305. rotating shaft ; 306, cover plate; 307, pinion; 308, limit rod; 309, block; 310, first spring; 311, first baffle; 312, second spring; 4, second slide bar; 401, second fixed plate; 402, second baffle; 403, third spring; 404, vertical plate; 405, thin rod; 406, elastic member; 407, first connecting block; 408, first slide plate; 409, third baffle; 410, fourth spring; 5, tooth block; 501, auxiliary gear; 502, rack plate; 503, second connecting block; 504, second slide plate. DETAILED DESCRIPTION

[0043] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0044] In the description of the present invention, it is necessary to understand that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0045] Embodiment 1:

[0046] Reference Figure 1-Figure 5 , Figure 8 and Fig.13 A gradient aging device for film capacitors for electric vehicles includes a test box 1 and an aging body 2 connected to the test box 1. The aging body 2 is provided with multiple layers, each layer of the aging body 2 is provided with an insulating plate 202, each insulating plate 202 is connected with a plurality of partitions 203, and a capacitor body is placed between two adjacent partitions 203; a plurality of current sampling terminals 210 and a plurality of PCB high-voltage terminals 211 matched with the capacitor body are provided at the bottom of the insulating plate 202, a fixed block 104 is fixedly provided in the test box 1, a first socket 105 is provided on the fixed block 104, a vertical plate 207 is fixedly provided on the top of the aging body 2, and a second socket 208 is provided on the vertical plate 207.

[0047] In this embodiment, the insulating plate 202 is provided with five layers. Except for the bottom insulating plate 202, the bottoms of the remaining four insulating plates 202 are provided with current sampling terminals 210 and PCB high-voltage terminals 211. When in use, multiple capacitor bodies that need to be subjected to aging tests are placed between adjacent partitions 203, and then the capacitor bodies are connected to the PCB high-voltage terminals 211 at the bottom of the insulating plate 202 through wires. It should be noted that in this application, two test boxes 1 are provided, and three aging vehicle bodies 2 can be placed in each test box 1 door at the same time for testing operations. A control terminal 101 is provided between the test box 1, and a main connector is provided on the control terminal 101. When the second socket 208 is connected to the main connector, the current sampling terminal 210 can be connected to the main connector. The PCB high-voltage terminal 211 is the HV+ input terminal, which is composed of three groups of PCB high-voltage connecting wires of ≥0.5 square. The PCB high-voltage terminal 211 on the four-layer insulation board 202 is connected in parallel to the second socket 208 on the aging car body 2. The second socket 208 is the input and output port of the aging car body 2. A fuse and a diode are also provided on the PCB high-voltage terminal 211. The specific circuit diagram is as follows Fig.13 As shown in the figure, the sample is the capacitor body, and the connection method of other undisclosed parts can adopt the conventional connection method in the prior art. Then the aging test can be carried out. The aging test can be used to better analyze the product performance, screen out capacitors with defects in the body itself in advance, and solve the problem of early failure of the capacitor during use.

[0048] In the present application, the current sampling terminal 210 and the PCB high voltage terminal 211 can be connected to the insulating plate 202 through studs and fixed by screws.

[0049] Embodiment 2:

[0050] Reference Figure 2-Figure 12, a gradient aging device for film capacitors for electric vehicles, is basically the same as the first embodiment, and further, a first fixed plate 301 and a second fixed plate 401 are fixedly connected to the aging body 2, a first sliding bar 3 is slidably connected to the first fixed plate 301, a sliding block 302 is slidably connected to the top of the aging body 2, the first sliding bar 3 is abutted against the outer wall of the sliding block 302, and a push plate 303 is provided on the outer wall of the sliding block 302.

[0051] Reference Figure 4 , Figure 6 and Figure 7 A support plate 304 is provided on the vertical plate 207, a rotating shaft 305 is rotatably connected to the support plate 304, a cover plate 306 is fixedly connected to the rotating shaft 305, the cover plate 306 cooperates with the second socket 208, a pinion 307 is also provided on the rotating shaft 305, and a gear tooth meshing with the pinion 307 is provided on the push plate 303.

[0052] In this embodiment, when the aging car body 2 is pushed into the test box 1, the first slide bar 3 and the second slide bar 4 on the aging car body 2 will touch the inner wall of the test box 1, so that the first slide bar 3 and the second slide bar 4 start to move. When the first slide bar 3 moves, it will first push the slider 302 located on the other side of the first fixed plate 301 to move, thereby driving the push plate 303 to move. At this time, the gear teeth on the push plate 303 will mesh with the pinion 307, thereby driving the pinion 307 and the rotating shaft 305 to rotate. When the rotating shaft 305 rotates, it will drive the cover plate 306 connected to its outer wall to rotate, and at this time, the first cover plate 306 can no longer block The second socket 208 is opened, and then the second socket 208 can be connected to the main connector on the control end 101 through the connecting line to achieve electrical connection; it should be noted that when the aging car body 2 is not in use, the cover 306 can cover the second socket 208, which can prevent dust and impurities from entering the second socket 208, thereby affecting the insertion effect and use effect of the second socket 208. The service life of the cover 306 can be increased. After the aging car body 2 is pushed into the test box 1, the cover 306 can be automatically opened without manual operation, which is convenient for use and connection, and improves the convenience of operation.

[0053] Reference Figure 7 and Fig.11 A limiting rod 308 is provided on the slider 302, and a first spring 310 is sleeved on the limiting rod 308. The first spring 310 is arranged between the slider 302 and the vertical plate 207. The limiting rod 308 is slidably connected to the vertical plate 207. A stopper 309 is provided at one end of the limiting rod 308 outside the vertical plate 207. A first baffle 311 is fixedly connected to the outer wall of the first sliding rod 3, and a second spring 312 is connected between the first baffle 311 and the first fixed plate 301.

[0054] In this embodiment, when the aging test is completed and the aging vehicle body 2 is pushed out, the slider 302 and the first slide bar 3 are automatically reset by the first spring 310 and the second spring 312, thereby driving the push plate 303 to automatically reset, and then the gear teeth on the push plate 303 drive the pinion 307 to rotate in the opposite direction, so that the cover plate 306 is closed again to protect the second socket 208.

[0055] It should be noted again that the moving distance of the first slide bar 3 and the slider 302 is limited, that is, the slider 302 can only move the push plate 303 a short distance when moving. Therefore, the gear teeth on the push plate 303 can only make the pinion 307 rotate a short distance, which will not cause jamming, etc., and the set limit rod 308 can make the movement of the slider 302 and the push plate 303 more stable.

[0056] Embodiment three:

[0057] Reference Figure 2-Figure 12 , a gradient aging device for film capacitors for electric vehicles, is basically the same as the first embodiment, and further, a first fixed plate 301 and a second fixed plate 401 are fixedly connected to the aging body 2, a first sliding bar 3 is slidably connected to the first fixed plate 301, a sliding block 302 is slidably connected to the top of the aging body 2, the first sliding bar 3 is abutted against the outer wall of the sliding block 302, and a push plate 303 is provided on the outer wall of the sliding block 302.

[0058] Reference Figure 4-Figure 12 Two long grooves 206 are provided on the insulating plate 202 between two adjacent partitions 203, and the first slide plate 408 and the second slide plate 504 are slidably connected in the two long grooves 206 respectively, and the first slide plate 408 and the second slide plate 504 are fixedly connected to the first slide plate 408 and the second slide plate 504 respectively.

[0059] In this embodiment, when the aging car body 2 is pushed into the test box 1, the first slide bar 3 and the second slide bar 4 on the aging car body 2 will touch the inner wall of the test box 1, so that the first slide bar 3 and the second slide bar 4 will start to move. When the second slide bar 4 moves, it will drive the first slide plate 408 and the second slide plate 504 to move, so that the first slide plate 408 and the second slide plate 504 respectively drive the first clamping plate 204 and the second clamping plate 205 to approach at the same time, so as to fix the capacitor body. The long groove 206 can make the first clamping plate 408 and the second clamping plate 504 move conveniently and make the movement more stable. It should be noted that the purpose of fixing the capacitor body by the first clamping plate 204 and the second clamping plate 205 is to prevent the capacitor body from being aging during the aging test. During the aging test, the capacitor body 2 may fall due to unstable fixation or mechanical stress, thereby affecting the test results. In severe cases, the shell may be ruptured, the internal components may be damaged, or even a short circuit may be caused. At the same time, the aging test may be interrupted, affecting the accuracy and reliability of the test results. Therefore, in the present application, after the aging car body 2 is pushed into the test box 1, the capacitor body can be fixed by the first clamping plate 204 and the second clamping plate 205, thereby preventing the capacitor body from falling and protecting the capacitor body. At the same time, the accuracy and reliability of the test can be ensured. When the aging test is completed, the aging car body 2 is pushed out, which can move the first clamping plate 204 and the second clamping plate 205 to both sides, thereby terminating the fixation of the capacitor body and facilitating the removal of the capacitor body.

[0060] In the present application, the first fixing plate 301 is disposed on the top insulating plate 202 , and except for the top insulating plate 202 , the bottoms of the other four insulating plates 202 are all provided with second fixing plates 401 .

[0061] Reference Figure 8-Figure 11 The second sliding rod 4 is fixedly connected to a vertical plate 404, a thin rod 405 is provided on the vertical plate 404, a first connecting block 407 is slidably connected to the thin rod 405, a first sliding plate 408 is fixedly connected to the first connecting block 407, an elastic member 406 is provided between the vertical plate 404 and the first connecting block 407, and the elastic member 406 is sleeved on the outer wall of the thin rod 405.

[0062] Reference Figure 8-Figure 11 A tooth block 5 is provided on the outer wall of the second sliding rod 4, an auxiliary gear 501 is rotatably connected to the second fixed plate 401, the tooth block 5 is meshed with the bottom of the auxiliary gear 501, a rack plate 502 is slidably connected to the second fixed plate 401, the rack plate 502 is meshed with the top of the auxiliary gear 501, a second connecting block 503 is fixedly connected to the rack plate 502, and the second connecting block 503 is fixedly connected to the second slide plate 504.

[0063] In this embodiment, when the second slide bar 4 moves, on the one hand, it will push the vertical plate 404 to move, and the vertical plate 404 will drive the first connecting block 407 to move through the thin rod 405 and the elastic member 406, so that the first connecting block 407 drives the first slide plate 408 and the first clamping plate 204 to move; on the other hand, the tooth block 5 on the second slide bar 4 will mesh with the auxiliary gear 501, thereby driving the auxiliary gear 501 to rotate, and then the auxiliary gear 501 will mesh with the rack plate 502 at its top, driving the rack plate 502 to move, thereby driving the second connecting block 503 to move, and the second connecting block 503 will drive the second slide plate 504 and the second clamping plate 205 to move, so that the first clamping plate 204 and the second clamping plate 205 can move at the same time, thereby clamping the capacitor body and fixing it, which is more convenient to carry out Aging test: It should be noted that an elastic member 406 is provided between the first connecting block 407 and the vertical plate 404, which can provide a certain buffer for the moving position of the first clamping plate 204, so that the first clamping plate 204 has a certain buffer when clamping the capacitor body to avoid damaging the capacitor body. Specifically, the rack plate 502 is slidably arranged on the inner wall of the second fixed plate 401, which can ensure the smooth movement of the rack plate 502 without tilting, etc., and the rack plate 502 and the tooth block 5 are respectively placed on the upper and lower sides of the auxiliary gear 501. When the second slide bar 4 moves to the left, the rotation of the auxiliary gear 501 can drive the rack plate 502 to move to the right, thereby driving the second slide plate 504 and the second clamping plate 205 to move to the right, and cooperating with the first clamping plate 204 to fix the capacitor body.

[0064] Reference Figure 8-Figure 11 A second slide bar 4 is slidably connected inside the second fixed plate 401, and a second baffle 402 and a third baffle 409 are respectively provided at both ends of the second slide bar 4. A third spring 403 is provided between the second baffle 402 and the aging car body 2, and a fourth spring 410 is provided between the third baffle 409 and the aging car body 2. The third spring 403 and the fourth spring 410 are both sleeved on the outer wall of the second slide bar 4.

[0065] When the aging car body 2 moves into the test box 1, the first baffle 311 on the first slide bar 3 and the second baffle 402 on the second slide bar 4 will touch the inner wall of the test box 1 respectively, and then squeeze the second spring 312 and the third spring 403. When the aging car body 2 moves out of the test box 1, the squeezed second spring 312 and the third spring 403 will automatically reset, and then the second slide bar 4 will automatically reset, so that the first clamping plate 204 and the second clamping plate 205 will automatically reset, and the capacitor body can be conveniently taken out. The third baffle 409 and the fourth spring 410 can make the second slide bar 4 move more stably, which is convenient for limiting the second slide bar 4.

[0066] Embodiment 4:

[0067] Reference Figure 1-Figure 3 , a gradient aging device for film capacitors for electric vehicles, is basically the same as the first embodiment, and further, a roller 201 is provided at the bottom of the aging body 2, a handrail 209 is fixedly connected to the outer wall of the aging body 2, a slide groove 103 is provided on the inner wall of the bottom of the test box 1, the roller 201 is rollingly connected in the slide groove 103, and a rotating door 102 is rotatably connected to the test box 1.

[0068] In this embodiment, the roller 201 and the handrail 209 are provided to facilitate the movement of the aging car body 2, and the inner wall of the bottom of the test box 1 is provided with a slide groove 103, which can limit the position of the aging car body 2, which is convenient for practical use. After the aging car body 2 is pushed into the test box 1, the main connector is connected to the first socket 105 and the second socket 208 respectively through the connecting line, and the aging test can be carried out after the rotating door 102 is closed. The rotating door 102 is provided with a lock structure, which can be fixed after closing, and when the rotating door 102 is closed, the position of the aging car body 2 can be fixed, so that the operations in the second and third embodiments are convenient to carry out.

[0069] Embodiment five:

[0070] A gradient aging process for film capacitors for electric vehicles is performed using the following steps:

[0071] First, the capacitor body to be subjected to the aging test is placed on the insulating plate 202, and a capacitor body is placed between each two adjacent partitions 203; the corresponding current sampling terminals 210 are connected to the PCB high voltage terminals 211, and the PCB high voltage terminals 211 are connected to the corresponding capacitor bodies through wires; the aging vehicle bodies 2 are pushed into the test box 1, and three aging vehicle bodies 2 are placed in each test box 1;

[0072] Then set the aging temperature, aging voltage and protection leakage current of the first stage. The aging temperature is raised from room temperature to 95°C within 0.5H, and then kept at a constant temperature for 2H; the aging voltage is the rated voltage Un; the protection leakage current is ≤12uA / uF;

[0073] Among them, the aging voltage of the capacitor with specification of 500VDC 600uF is set to 500VDC, and the protection leakage current of the capacitor with specification of 500VDC 600uF is ≤7.2mA;

[0074] Set the aging temperature, aging voltage and protection leakage current of the second stage; the aging temperature is increased from 95℃ to 105℃ within 0.5H and then kept at a constant temperature for 3H; the aging voltage is the rated voltage Un or (0.85-0.9)*Un, and the voltage derating range is determined according to the design voltage margin; the protection leakage current is ≤12uA / uF.

[0075] Among them, for 500VDC 600uF capacitors, if 2.9um film design is used and the voltage margin is >50%, the aging voltage is set to 500VDC. If 2.5um film design is used and the voltage margin is >30%, the aging voltage is set to 450VDC. The protection leakage current of 500VDC 600uF capacitors is ≤7.2mA.

[0076] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A gradient aging device for film capacitors for electric vehicles, comprising a test box (1), characterized in that: Also includes: An aging car body (2) connected to the test box (1), the aging car body (2) being provided with multiple layers, each layer of the aging car body (2) being provided with an insulating plate (202), each insulating plate (202) being connected to a plurality of partitions (203), and a capacitor body being placed between two adjacent partitions (203); A plurality of current sampling terminals (210) and a plurality of PCB high-voltage terminals (211) matched with the capacitor body are arranged at the bottom of the insulating plate (202); A fixed block (104) is fixedly disposed in the test box (1), and a first socket (105) is provided on the fixed block (104); The vertical plate (207) is fixedly arranged on the aged vehicle body (2), and a second socket (208) is provided on the vertical plate (207).

2. The gradient aging equipment for film capacitors for electric vehicles according to claim 1, characterized in that: A first fixing plate (301) and a second fixing plate (401) are fixedly connected to the aging vehicle body (2); a first sliding rod (3) is slidably connected to the first fixing plate (301); a sliding block (302) is slidably connected to the top of the aging vehicle body (2); the first sliding rod (3) abuts against an outer wall of the sliding block (302); and a push plate (303) is provided on the outer wall of the sliding block (302).

3. The gradient aging equipment for film capacitors for electric vehicles according to claim 2, characterized in that: A support plate (304) is provided on the vertical plate (207), a rotating shaft (305) is rotatably connected to the support plate (304), a cover plate (306) is fixedly connected to the rotating shaft (305), the cover plate (306) is matched with the second socket (208), a pinion (307) is also provided on the rotating shaft (305), and gear teeth meshing with the pinion (307) are provided on the push plate (303).

4. The gradient aging equipment for film capacitors for electric vehicles according to claim 3, characterized in that: The slider (302) is provided with a limit rod (308), the limit rod (308) is sleeved with a first spring (310), the first spring (310) is arranged between the slider (302) and the vertical plate (207), the limit rod (308) is slidably connected to the vertical plate (207), a stopper (309) is provided at one end of the limit rod (308) outside the vertical plate (207), a first stopper (311) is fixedly connected to the outer wall of the first slider (3), and a second spring (312) is connected between the first stopper (311) and the first fixed plate (301).

5. The gradient aging equipment for film capacitors for electric vehicles according to claim 2, characterized in that: Two long grooves (206) are provided on the insulating plate (202) between two adjacent partitions (203), a first slide plate (408) and a second slide plate (504) are slidably connected in the two long grooves (206), and a first clamping plate (204) and a second clamping plate (205) are fixedly connected to the first slide plate (408) and the second slide plate (504), respectively.

6. The gradient aging equipment for film capacitors for electric vehicles according to claim 5, characterized in that: The second sliding rod (4) is fixedly connected to a vertical plate (404), a thin rod (405) is provided on the vertical plate (404), a first connecting block (407) is slidably connected to the thin rod (405), the first sliding plate (408) is fixedly connected to the first connecting block (407), an elastic member (406) is provided between the vertical plate (404) and the first connecting block (407), and the elastic member (406) is sleeved on the outer wall of the thin rod (405).

7. The gradient aging equipment for film capacitors for electric vehicles according to claim 6, characterized in that: A tooth block (5) is provided on the outer wall of the second sliding rod (4); an auxiliary gear (501) is rotatably connected inside the second fixed plate (401); the tooth block (5) is meshed with the bottom of the auxiliary gear (501); a rack plate (502) is slidably connected inside the second fixed plate (401); the rack plate (502) is meshed with the top of the auxiliary gear (501); a second connecting block (503) is fixedly connected to the rack plate (502); and the second connecting block (503) is fixedly connected to the second sliding plate (504).

8. The gradient aging equipment for film capacitors for electric vehicles according to claim 7, characterized in that: A second slide bar (4) is slidably connected inside the second fixed plate (401), a second baffle plate (402) and a third baffle plate (409) are respectively provided at two ends of the second slide bar (4), a third spring (403) is provided between the second baffle plate (402) and the aged vehicle body (2), a fourth spring (410) is provided between the third baffle plate (409) and the aged vehicle body (2), and the third spring (403) and the fourth spring (410) are both sleeved on the outer wall of the second slide bar (4).

9. The gradient aging equipment for film capacitors for electric vehicles according to claim 1, characterized in that: A roller (201) is provided at the bottom of the aging vehicle body (2), a handrail (209) is fixedly connected to the outer wall of the aging vehicle body (2), a slide groove (103) is provided on the inner wall of the bottom of the test box (1), the roller (201) is rollingly connected in the slide groove (103), and a rotating door (102) is rotatably connected to the test box (1).

10. A gradient aging process for film capacitors for electric vehicles, comprising a gradient aging device for film capacitors for electric vehicles according to any one of claims 1 to 9, characterized in that: Use the following steps: S1, firstly placing a capacitor body to be subjected to an aging test on an insulating plate (202), with one capacitor body being placed between each two adjacent partitions (203); S2, connecting the corresponding current sampling terminals (210) to the PCB high voltage terminals (211), and the PCB high voltage terminals (211) are respectively connected to the corresponding capacitor bodies via wires; S3, pushing the aged vehicle bodies (2) into the test boxes (1), each test box (1) containing three aged vehicle bodies (2); S4, set the aging temperature, aging voltage and protection leakage current of the first stage. The aging temperature is raised from room temperature to 95°C within 0.5 hours, and then kept at a constant temperature for 2 hours; the aging voltage is the rated voltage Un; the protection leakage current is ≤12uA / uF; S5, set the aging temperature, aging voltage and protection leakage current of the second stage; the aging temperature is increased from 95℃ to 105℃ within 0.5H and then kept at a constant temperature for 3H; the aging voltage is the rated voltage Un or (0.85-0.9)*Un, and the voltage derating range is determined according to the design voltage margin; the protection leakage current is ≤12uA / uF.

Images