CN214310807U

CN214310807U - Insulation testing device

Info

Publication number: CN214310807U
Application number: CN202022636757.3U
Authority: CN
Inventors: 丁佳林; 穆建华; 李龙; 贺梦江
Original assignee: Sunwoda Electric Vehicle Battery Co Ltd
Current assignee: Xinwangda Power Technology Co ltd
Priority date: 2020-11-16
Filing date: 2020-11-16
Publication date: 2021-09-28
Anticipated expiration: 2030-11-16

Abstract

The utility model relates to an insulation test device for the insulating properties of test square battery outside insulating film, insulation test device includes lower plate, top board, locating piece, side pressure subassembly and bottom pressure subassembly, and the lower plate is used for bearing square battery's first big face, and the top board is used for supporting the big face of square battery's second: the positioning block is arranged on the lower bottom plate and used for positioning the square battery; the side pressing assembly and the bottom pressing assembly are respectively provided with a profiling structure, the side pressing assembly is used for abutting against a first side surface and a second side surface of the square battery and corner areas connected with the first side surface and the second side surface, and the bottom pressing assembly is used for abutting against the bottom surface of the square battery and the corner areas connected with the bottom surface; the utility model discloses an insulation test device, top board, holding down plate, side pressure subassembly and end pressure subassembly can carry out no dead angle, full cladding pressfitting to the outside insulating film of square battery to can detect the full cladding insulating properties of the outside insulating film of square battery.

Description

Insulation testing device

Technical Field

The utility model relates to a testing arrangement technical field especially relates to an insulation testing device.

Background

With the continuous development of society and the ever-increasing environmental awareness of people, the market demand of new energy automobiles is continuously increased. However, the safety problem of the power battery is an important factor restricting the development of new energy vehicles, and the short circuit of the battery is a main cause of battery safety accidents, so the insulation requirements of single batteries and modules in the industry are higher and higher.

Before leaving the factory, a lithium battery manufacturer usually performs insulation test on the coated finished battery. However, the conventional insulation testing device can only detect the large surface, the side surface and the bottom of the battery, and cannot detect the corner regions, the sharp corners and other parts of the battery. The leakage of the killed battery brings potential safety hazards to the module and the whole vehicle manufacturer.

SUMMERY OF THE UTILITY MODEL

In view of the above, there is a need to provide an insulation testing apparatus to solve the above problems.

The utility model discloses an insulation test device for test square battery external insulation film's insulating properties, insulation test device includes lower plate, top board, locating piece, side pressure subassembly and end pressure subassembly, lower plate, upper plate set up relatively, the lower plate is used for bearing square battery's first big face, the top board is used for supporting the pressure square battery's the second big face: the positioning block is arranged on the lower bottom plate and used for positioning the square battery; the side pressing assembly and the bottom pressing assembly are respectively provided with a profiling structure, the side pressing assembly is used for pressing a first side surface and a second side surface of the square battery and corner areas connected with the first side surface and the second side surface, and the bottom pressing assembly is used for pressing the bottom surface of the square battery and the corner areas connected with the bottom surface; the upper pressing plate, the lower pressing plate, the side pressing assembly and the bottom pressing assembly can be used for fully coating and pressing the insulating film outside the square battery.

In one embodiment, the side pressing assembly comprises a side pressing piece with a profiling structure, the cross section of the side pressing piece is U-shaped, the side pressing piece comprises a first bottom and a first bulge, the first bottom is used for pressing against the first side face or the second side face of the square battery, and the first bulge is used for pressing against a corner area between the first side face or the second side face of the square battery and the first large face or the second large face; the bottom pressing component comprises a bottom pressing piece with a profiling structure, the front view structure of the bottom pressing piece is of a shape of a Chinese character hui and comprises a second bottom and a second protruding portion, the second protruding portion is connected to the outer edge of the second bottom in a surrounding mode, the second bottom is used for abutting against the bottom surface of the square battery, and the second protruding portion is used for abutting against the corner area between the bottom surface of the square battery and the first large surface, the second large surface, the first side surface and the second side surface.

In one embodiment, the side pressing assembly comprises a side pressing piece with a profiling structure, the front view structure of the side pressing piece is in a shape of a Chinese character 'hui', and the side pressing piece comprises a first bottom and a first bulge, the first bulge surrounds the outer edge connected to the first bottom, the first bottom is used for pressing the first side surface or the second side surface of the square battery, and the first bulge is used for pressing the corner area between the first side surface or the second side surface of the square battery and the first large surface, the second large surface and the bottom surface; the bottom pressing component comprises a bottom pressing piece with a profiling structure, the cross section of the bottom pressing piece is U-shaped and comprises a second bottom and a second protruding portion, the second bottom is used for abutting against the bottom surface of the square battery, and the second protruding portion is used for abutting against a corner area between the bottom surface of the square battery and the first large surface and between the bottom surface of the square battery and the second large surface.

In one embodiment, the area of each of the lower base plate and the upper pressure plate is smaller than that of the first large face or the second large face of the square battery, a space exists between the outer edge of the lower base plate and the outer edge of the first large face, and a space exists between the outer edge of the upper pressure plate and the outer edge of the second large face, and the first protruding portion and the second protruding portion can completely cover the space.

In one embodiment, the side pressing member comprises a first frame and a first conductive silica gel block arranged on the inner surface of the first frame, and the bottom pressing member comprises a second frame and a second conductive silica gel block arranged on the inner surface of the second frame.

In one embodiment, an included angle between the inner side wall of the first protrusion and the first bottom and an included angle between the inner side wall of the second protrusion and the second bottom are both greater than 90 ° and less than or equal to 120 °.

In one embodiment, the upper surface of the lower base plate is opposite to the lower surface of the upper press plate, the upper surface of the lower base plate is used for abutting against the first large surface of the square battery, the lower surface of the upper press plate is used for abutting against the second large surface of the square battery, and the upper surface of the lower base plate and the lower surface of the upper press plate are both provided with conductive cloth.

In one embodiment, the insulation testing device further comprises a positive electrode probe, the positive electrode probe is connected to a positive electrode port of the insulation testing device, and the positive electrode probe is used for being electrically connected with a positive electrode pole of the square battery; the conductive cloth, the first conductive silica gel block and the second conductive silica gel block are all connected to a negative port of the insulation testing device through leads.

In one embodiment, the side press assembly further comprises a first driving member, and the bottom press assembly further comprises a second driving member; the first driving piece is connected with the side pressing piece and used for driving the side pressing piece to abut against the first side face or the second side face of the square battery; the second driving piece is connected with the bottom pressing piece and used for driving the bottom pressing piece to abut against the bottom surface of the square battery; the insulation testing device further comprises a third driving piece and a fourth driving piece, wherein the third driving piece is connected with the positive electrode probe and is used for driving the positive electrode probe to press against a positive electrode pole of the square battery; the fourth driving part is connected with the upper pressure plate and used for driving the upper pressure plate to abut against the second large surface of the square battery.

In one embodiment, the lower bottom plate and the upper pressure plate are provided with protective gaskets on the surfaces close to the side pressure assemblies and the bottom pressure assembly.

The utility model discloses an insulation test device, its beneficial effect does:

the utility model discloses an insulation test device, through the structure and the relation of connection each other of lower plate, top board, locating piece, side pressure subassembly and end pressure subassembly among the reasonable insulation test device that sets up, after insulation test device wholly supports pressing square cell, top board, lower plate, side pressure subassembly and end pressure subassembly can carry out no dead angle, pressfitting with full cladding to the outside insulating film of square cell to can detect the full cladding insulating properties of the outside insulating film of square cell.

Drawings

Fig. 1 is a schematic perspective view of a square battery according to an embodiment of the present invention.

Fig. 2 is a schematic structural diagram of an insulation testing apparatus according to an embodiment of the present invention before pressing a square battery.

Fig. 3 is a schematic perspective view of a first lateral pressing assembly of an insulation testing apparatus according to an embodiment of the present invention.

Fig. 4 is a schematic perspective view of a bottom pressing assembly of an insulation testing apparatus according to an embodiment of the present invention.

Fig. 5 is a schematic structural view of the square battery after being pressed by the insulation testing apparatus according to an embodiment of the present invention.

Fig. 6 is a schematic top view of the square battery pressed by the upper pressing plate according to an embodiment of the present invention.

Fig. 7 is a schematic top view of a square battery pressed by an upper pressing plate, a side pressing member of a first side pressing assembly, a side pressing member of a second side pressing assembly, and a bottom pressing member of a bottom pressing assembly according to an embodiment of the present invention.

Fig. 8 is a schematic top view of a square battery according to another embodiment of the present invention, after being pressed by the upper pressing plate, the side pressing member of the first side pressing assembly, the side pressing member of the second side pressing assembly, and the bottom pressing member of the bottom pressing assembly.

Fig. 9 is a schematic cross-sectional view of a lateral pressing member of an insulation testing apparatus according to an embodiment of the present invention.

Reference numerals:

the device comprises a lower bottom plate 1, a positioning block 2, an anode probe 3, an upper pressing plate 4, a first lateral pressing assembly 5, a second lateral pressing assembly 6, a bottom pressing assembly 7, a third driving piece 8, a protective gasket 9, a fourth driving piece 10, a gap 11, a square battery 20, a first large surface 21, a second large surface 22, a first lateral surface 23, a second lateral surface 24, a top surface 25, a bottom surface 26, an anode pole 27, a cathode pole 28, an insulating film 29, a lateral pressing piece 50, a first frame 51, a first conductive silica gel block 52, a first bottom 53, a first protruding portion 54, a first space 55, a first driving piece 56, a bottom pressing piece 70, a second frame 71, a second conductive silica gel block 72, a second bottom 73, a second protruding portion 74, a second space 75 and a second driving piece 76.

Detailed Description

In order to make the above objects, features and advantages of the present invention more comprehensible, embodiments of the present invention are described in detail below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein, as those skilled in the art will be able to make similar modifications without departing from the spirit and scope of the present invention.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", and the like, indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

In the present application, unless expressly stated or limited otherwise, the first feature may be directly on or directly under the second feature or indirectly via intermediate members. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like as used herein are for illustrative purposes only and do not denote a unique embodiment.

Generally, a lithium battery manufacturer coats an insulating film on the surface of a finished single battery (called a battery for short). In the coating process of the lithium battery, metal particles and scraps are inevitably mixed between the battery and the insulating film, the incoming material of the insulating film possibly has the defects of pinholes, foreign matters and the like, and sharp corners are generated in the coating process to cause glue shortage and glue extrusion. Various problems can lead to short or long term battery failure.

For a square-shell power battery, in order to prevent the shell from being corroded by electrolyte, the shell and the anode are conducted and are at a higher potential together. When the single batteries are assembled into the module, the batteries can be connected in series and in parallel by matching with the module design, and a larger pretightening force is applied to the batteries. Meanwhile, in the long-term circulation of the battery, due to the continuous occurrence of side reactions, the air pressure in the battery is increased, the extrusion force on the shell is larger, and the outwards expansion deformation of the shell can be caused by the continuously increased pressure in the shell. If there are defects such as metal particles, foreign matters and the like between the battery shell and the insulating film, the expansion deformation of the shell can cause the particles between the shell and the insulating film to puncture the insulating film, so that the anode shells of adjacent batteries are connected, the negative electrode and the positive electrode of the battery in a serial state can be short-circuited, serious safety accidents can be caused, and the safety of vehicles and personnel can be damaged.

Before leaving the factory, a lithium battery manufacturer usually performs insulation test on the coated finished battery. However, the conventional insulation testing device can only detect the large surface, the side surface and the bottom surface of the battery, and cannot detect the corner region of the battery. The leakage of the killed battery brings potential safety hazards to the module and the whole vehicle manufacturer.

In one embodiment, the insulation testing apparatus is used for testing the insulation performance of the external insulation film of the square battery 20, the structure of the square battery 20 is as shown in fig. 1, and includes a first large surface 21, a second large surface 22, a first side surface 23, a second side surface 24, a top surface 25 and a bottom surface 26, wherein the first large surface 21 is disposed opposite to the second large surface 22, the first side surface 23 is disposed opposite to the second side surface 24, the bottom surface 26 is disposed opposite to the top surface 25, the area of the first large surface 21 or the second large surface 22 is larger than the area of the first side surface 23, the second side surface 24, the bottom surface 26 or the top surface 25, the positive electrode post 27 and the negative electrode post 28 of the square battery 20 are both disposed on the top surface 25, and the square battery 20 is externally coated with the insulation film 29. As shown in fig. 1, the insulating film 29 covers the outer periphery region (not shown) of the rectangular battery in which the first large surface 21, the second large surface 22, the first side surface 23, the second side surface 24, the bottom surface 26, and the top surface 25 are connected to the first large surface 21, the second large surface 22, the first side surface 23, and the second side surface 24. Because the insulating film 29 in the outer ring area of the top surface 25 is not easy to expand and lose efficacy, and when the square battery 20 is assembled into a battery module, other insulating structures are arranged on the top surface 25, the insulation testing device is mainly used for detecting the full-coating condition and the insulating performance of the insulating film 29 on the first large surface 21, the second large surface 22, the first side surface 23, the second side surface 24 and the bottom surface 26 outside the square battery 20.

The structure of the insulation testing device is shown in fig. 2, and comprises a lower bottom plate 1, an upper pressure plate 4, a positioning block 2, a side pressure assembly and a bottom pressure assembly 7, wherein the lower bottom plate 1 and the upper pressure plate 4 are arranged oppositely, the lower bottom plate 1 is used for bearing a first large surface 21 of a square battery 20, and the upper pressure plate 4 is used for abutting against a second large surface 22 of the square battery 20: the positioning block 2 is arranged on the lower bottom plate 1 and is used for being matched with the positive pole post 27 and the negative pole post 28 on the top surface 25 of the square battery 20 so as to position the square battery 20 on the lower bottom plate 1; the side pressing assembly and the bottom pressing assembly 7 are of profiling structures, the side pressing assembly is used for pressing against a first side surface 23 and a second side surface 24 of the square battery 20 and corner areas connected with the first side surface 23 and the second side surface 24, and the bottom pressing assembly 7 is used for pressing against a bottom surface 26 of the square battery 20 and corner areas connected with the bottom surface 26; the upper press plate 4, the lower press plate 1, the side press assembly and the bottom press assembly 7 can fully cover and press the insulating films 29 at the first large surface 21, the second large surface 22, the first side surface 23, the second side surface 24 and the bottom surface 26 of the square battery 20.

As shown in fig. 2, the side pressing assemblies include a first side pressing assembly 5 and a second side pressing assembly 6, which are symmetrically arranged, the first side pressing assembly 5 is used for pressing against a first side surface 23 of the prismatic battery 20 and a corner area connected with the first side surface 23, and the second side pressing assembly 6 is used for pressing against a second side surface 24 of the prismatic battery 20 and a corner area connected with the second side surface 24. The first side pressing assembly 5 is constructed as shown in fig. 3, and includes a side pressing member 50 and a first driving member 56, the side pressing member 50 has a profile structure, and the first driving member 56 is connected to the side pressing member 50 for driving the side pressing member 50 against the first side 23 of the prismatic battery 20. It should be noted that the first side pressing assembly 5 and the second side pressing assembly 6 have the same structure and each include a side pressing member 50 and a first driving member 56, the first driving member 56 of the first side pressing assembly 5 is used for driving the side pressing member 50 of the first side pressing assembly 5 to press against the first side surface 23 of the prismatic battery 20 and the corner area connected to the first side surface 23, and the first driving member 56 of the second side pressing assembly 6 is used for driving the side pressing member 50 of the second side pressing assembly 6 to press against the second side surface 24 of the prismatic battery 20 and the corner area connected to the second side surface 24.

As shown in fig. 3, the side pressing member 50 includes a first frame 51 and a first conductive silicone block 52 disposed on an inner surface of the first frame 51, the cross section of the side pressing member 50 is U-shaped, and includes a first bottom 53 and a first protrusion 54, the first bottom 53 and the first protrusion 54 together enclose a first space 55, the first space 55 is used for accommodating a side portion of the prismatic battery 20 corresponding to the first side surface 23, specifically, the first bottom 53 is used for pressing the first side surface 23 of the prismatic battery 20, and the first protrusion 54 is used for covering and pressing a corner region between the first side surface 23 and the first and second

large surfaces

21 and 22 of the prismatic battery 20. It should be noted that fig. 3 is a schematic structural diagram of the first side pressing assembly 5, the first bottom 53 of the first side pressing assembly 5 is used for pressing against the first side surface 23 of the prismatic battery 20, and the first protruding portion 54 of the first side pressing assembly 5 is used for covering and pressing against the corner region between the first side surface 23 and the first and second

large surfaces

21 and 22 of the prismatic battery 20. It can be understood that the first bottom 53 of the second side pressing member 6 is used for pressing against the second side surface 24 of the prismatic battery 20, and the first protruding portion 54 of the second side pressing member 6 is used for covering and pressing against the corner region between the second side surface 24 and the first and second

large surfaces

21 and 22 of the prismatic battery 20. The structure of the first lateral pressing assembly 5 and the second lateral pressing assembly 6 after the lateral pressing member 50 presses against the square battery 20 is shown in fig. 5 and 6, wherein fig. 5 is a schematic structural view of the insulation testing apparatus after being pressed against the square battery 20 as a whole, and fig. 6 is a schematic structural view of the square battery 20 after being pressed against the lateral pressing assembly as a whole.

In addition, as shown in fig. 4, the bottom pressing assembly 7 includes a bottom pressing member 70 and a second driving member 76, and the second driving member 76 is connected to the bottom pressing member 70 for driving the bottom pressing member 70 against the bottom surface 26 of the prismatic battery 20. The bottom pressing member 70 comprises a second frame 71 and a second conductive silica gel block 72 arranged on the inner surface of the second frame 71, the front view structure of the bottom pressing member 70 is of a reverse shape and comprises a second bottom 73 and a second protrusion 74, the second protrusion 74 is connected to the outer edge of the second bottom 73 in a surrounding manner, the second bottom 73 and the second protrusion 74 jointly enclose a second space 75, and the second space 75 is used for accommodating the bottom part of the square battery 20 corresponding to the bottom surface 26. Specifically, as shown in fig. 5 and 6, the second bottom portion 73 is used for pressing against the bottom surface 26 of the prismatic battery 20, and the second protruding portion 74 is used for pressing against the corner regions between the bottom surface 26 of the prismatic battery 20 and the first large surface 21, the second large surface 22, the first side surface 23, and the second side surface 24.

As shown in fig. 6, the second large surface 22 of the prismatic battery 20 is pressed by the upper pressing plate 4, the area of the upper pressing plate 4 is smaller than that of the second large surface 22 of the prismatic battery 20, and a space 11 is formed between the outer edge of the upper pressing plate 4 and the outer edge of the second large surface 22. The area of the lower plate 1 is the same as that of the upper plate 4, the area of the lower plate 1 is smaller than that of the first large face 21 of the prismatic battery 20, and a space 11 is also provided between the outer edge of the lower plate 1 and the outer edge of the first large face 21. In a particular embodiment, the width dimension D of the space 11 ranges from 3mm to 10mm, and may in particular be 6 mm. When the first side 23 and the second side 24 of the prismatic battery 20 are pressed by the side pressing members 50 of the first side pressing assembly 5 and the second side pressing assembly 6 respectively, as shown in fig. 7, the first projecting portion 54 of the first side press assembly 5 and the second projecting portion 74 of the second side press assembly 6 can completely cover the space 11, and the outer edge of the first projecting portion 54 abuts against the outer edge of the second projecting portion 74, the outer edges of the first projecting portion 54 and the second projecting portion 74 abut against the outer edges of the lower base plate 1 and the upper platen 4, therefore, after the insulation testing device is integrally pressed against the square battery 20, the lower base plate 1, the upper pressing plate 4, the first lateral pressing assembly 5, the second pressure measuring device and the bottom pressing assembly 7 of the insulation testing device can perform dead-angle-free full-coating pressing on the insulation films 29 at the first large surface 21, the second large surface 22, the first lateral surface 23, the second lateral surface 24 and the bottom surface 26 of the square battery 20.

In another embodiment, as shown in fig. 8, the structures of the side pressing members 50 of the first and second side pressing assemblies 5 and 6 can be interchanged with the structure of the bottom pressing member 70 of the bottom pressing assembly 7, that is, the front view structures of the side pressing members 50 of the first and second side pressing assemblies 5 and 6 are in a shape of a Chinese character 'hui', and include first bottom portions 53 and first protruding portions 54, the first protruding portions 54 surround the outer edges connected to the first bottom portions 53, the first bottom portions 53 of the first side pressing assemblies 5 are used for pressing against the first side surfaces 23 of the prismatic batteries 20, the first protruding portions 54 of the first side pressing assemblies 5 are used for pressing against the corner regions between the first side surfaces 23 and the first large surfaces 21, the second large surfaces 22 and the bottom surfaces 26 of the prismatic batteries 20, the first bottom portions 53 of the second side pressing assemblies 6 are used for pressing against the second side surfaces 24 of the prismatic batteries 20, and the first large surfaces 21, the second side surfaces 22 and the bottom surfaces 26 of the prismatic batteries 20, and the first protruding portions 54 of the second side pressing assemblies 6 are used for pressing against the second side surfaces 24 of the prismatic batteries 20, The corner region between the second major face 22 and the bottom face 26; the cross section of the bottom pressing member 70 of the bottom pressing assembly 7 is U-shaped, and includes a second bottom portion 73 and a second protruding portion 74, the second bottom portion 73 is used for pressing against the bottom surface 26 of the prismatic battery 20, and the second protruding portion 74 is used for pressing against the corner regions between the bottom surface 26 of the prismatic battery 20 and the first large surface 21 and the second large surface 22. With such an arrangement, as shown in fig. 8, after the insulation testing device is entirely pressed against the square battery 20, the lower base plate 1, the upper pressing plate 4, the first lateral pressing assembly 5, the second pressure measuring device, and the bottom pressing assembly 7 of the insulation testing device can perform full-coating pressing without dead corners on the insulation films 29 at the first large surface 21, the second large surface 22, the first lateral surface 23, the second lateral surface 24, and the bottom surface 26 of the square battery 20.

In one embodiment, the cross-sectional structure of the side pressing member 50 of the first side pressing assembly 5 is as shown in fig. 9, and the included angle α between the inner side wall of the first protrusion 54 and the first bottom 53 is greater than 90 ° and less than or equal to 120 °. In a specific embodiment, the included angle α between the inner side wall of the first protruding portion 54 and the first bottom 53 is in the range of 100 ° to 120 °, which facilitates the pressing of the side pressing member 50 of the first side pressing assembly 5 against the first side 23 of the prismatic battery 20 and the pressing of the side pressing member 50 of the second side pressing assembly 6 against the second side 24 of the prismatic battery 20. In addition, in order to facilitate the abutment of the bottom pressing member 70 of the bottom pressing assembly 7 against the bottom surface 26 of the prismatic battery 20, the angle β between the inner side wall of the second protruding portion 74 and the second bottom portion 73 is greater than 90 ° and less than or equal to 120 °. In a specific embodiment, the angle β between the inner sidewall of the first protrusion 54 and the first bottom 53 ranges from 100 ° to 120 °. If the included angles α and β are too large, the side pressing member 50 and the bottom pressing member 70 may not cover the corner regions of the rectangular battery 20 well.

In addition, in one embodiment, in order to enable the side pressing member 50 and the bottom pressing member 70 with the profiling structure to better cover and press the corner regions of the prismatic battery 20, as shown in fig. 3 and 4, the conductive silicone rubber blocks arranged on the inner surfaces of the first bottom 53 of the side pressing member 50 and the second bottom 73 of the bottom pressing member 70 are both hard conductive silicone rubber blocks, and the conductive silicone rubber blocks arranged on the inner surfaces of the first protruding portion 54 of the side pressing member 50 and the second protruding portion 74 of the bottom pressing member 70 are both soft conductive silicone rubber blocks, so that the soft contact and full covering of the corner regions outside the prismatic battery can be realized.

In addition, as shown in fig. 2, the insulation testing device further includes a positive electrode probe 3, the positive electrode probe 3 is connected to a positive electrode port of the insulation testing device, and the positive electrode probe 3 is used for being electrically connected with a positive electrode pole 27 of the square battery 20. As shown in fig. 2, the upper surface of the lower base plate 1 is disposed opposite to the lower surface of the upper press plate 4, the upper surface of the lower base plate 1 is used for pressing against the first large surface 21 of the square battery 20, the lower surface of the upper press plate 4 is used for pressing against the second large surface 22 of the square battery 20, and the upper surface of the lower base plate 1 and the lower surface of the upper press plate 4 are both provided with conductive cloth. As shown in fig. 3 and 4, the side pressing member 50 includes a first frame 51 and a first conductive silicone rubber block 52 disposed on an inner surface of the first frame 51, and the bottom pressing member 70 includes a second frame 71 and a second conductive silicone rubber block 72 disposed on an inner surface of the second frame 71. In one embodiment, the first frame 51 and the second frame 71 are both metal frames, the first conductive silicone block 52 and the second conductive silicone block 52 are collectively referred to as a conductive silicone block, and the conductive cloth and the conductive silicone block are both connected to a negative port of the insulation testing device through a wire. Therefore, when the insulation test device is pressed against the rectangular battery 20 as a whole, the insulation performance test of the exterior of the rectangular battery 20 can be started, and the full-coating condition of the external insulation film 29 can be detected.

In one embodiment, as shown in fig. 2, the insulation testing apparatus further includes a third driving member 8 and a fourth driving member 10, where the third driving member 8 is connected to the positive electrode probe 3 and is used for driving the positive electrode probe 3 to press against the positive electrode post 27 of the prismatic battery 20; the fourth driving member 10 is connected to the upper pressing plate 4 for driving the upper pressing plate 4 to press against the second large surface 22 of the square battery 20. In one particular embodiment, the first drive member 56, the second drive member 76, the third drive member 8, and the fourth drive member 10 are all pneumatic cylinders.

In addition, in one embodiment, as shown in fig. 2, the protection pads 9 are disposed on the surfaces of the lower plate 1 and the upper plate 4 close to the side pressing assemblies and the bottom pressing assemblies 7, so as to avoid hard collision with the side surfaces of the lower plate 1 and the upper plate 4 when the first side pressing assembly 5, the second side pressing assembly 6 and the bottom pressing assembly 7 press the rectangular battery 20. In addition, in another embodiment, the first conductive silicone rubber block 52 in the side pressing member 50 may slightly protrude from the first frame 51, and the second conductive silicone rubber block 72 in the bottom pressing member 70 may slightly protrude from the second frame 71, so that when the first side pressing member 5, the second side pressing member 6, and the bottom pressing member 7 press the rectangular battery 20, the protruding first conductive silicone rubber block 52 and the protruding second conductive silicone rubber block 72 can avoid hard collision between the side pressing member 50 and the lower base plate 1 and the upper pressing plate 4.

The utility model discloses an insulation test device, through lower plate 1 among the reasonable insulation test device that sets up, top board 4, locating piece 2, side pressure subassembly and end pressure subassembly 7's structure and the relation of connection each other, after insulation test device wholly supports and presses square battery 20, top board 4, the bottom board, side pressure subassembly and end pressure subassembly 7 can carry out no dead angle, pressfitting with full cladding to square battery 20 outside insulating film 29 to can detect the full cladding insulating properties of square battery 20 outside insulating film 29.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only represent some embodiments of the present invention, and the description thereof is specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.

Claims

1. The utility model provides an insulation test device for the insulating properties of test square battery outside insulating film, its characterized in that, insulation test device includes lower plate, top board, locating piece, side pressure subassembly and bottom pressure subassembly, lower plate, upper plate set up relatively, the lower plate is used for bearing square battery's first big face, the top board is used for supporting and presses square battery's the big face of second: the positioning block is arranged on the lower bottom plate and used for positioning the square battery; the side pressing assembly and the bottom pressing assembly are respectively provided with a profiling structure, the side pressing assembly is used for pressing a first side surface and a second side surface of the square battery and corner areas connected with the first side surface and the second side surface, and the bottom pressing assembly is used for pressing the bottom surface of the square battery and the corner areas connected with the bottom surface; the upper pressing plate, the lower pressing plate, the side pressing assembly and the bottom pressing assembly can be used for fully coating and pressing the insulating film outside the square battery.

2. The insulation testing device of claim 1, wherein the lateral pressure assembly comprises a lateral pressure member with a profiling structure, the lateral pressure member is U-shaped in cross section and comprises a first bottom and a first bulge, the first bottom is used for pressing against the first side surface or the second side surface of the square battery, and the first bulge is used for pressing against a corner area between the first side surface or the second side surface of the square battery and the first large surface or the second large surface; the bottom pressing component comprises a bottom pressing piece with a profiling structure, the front view structure of the bottom pressing piece is of a shape of a Chinese character hui and comprises a second bottom and a second protruding portion, the second protruding portion is connected to the outer edge of the second bottom in a surrounding mode, the second bottom is used for abutting against the bottom surface of the square battery, and the second protruding portion is used for abutting against the corner area between the bottom surface of the square battery and the first large surface, the second large surface, the first side surface and the second side surface.

3. The insulation testing device of claim 1, wherein the lateral pressure assembly comprises a lateral pressure member having a profiling structure, the lateral pressure member has a front view structure in a shape of a Chinese character 'hui', and comprises a first bottom and a first protrusion, the first protrusion surrounds an outer edge connected to the first bottom, the first bottom is used for pressing against a first side surface or a second side surface of the square battery, and the first protrusion is used for pressing against a corner area between the first side surface or the second side surface of the square battery and the first large surface, the second large surface and the bottom surface; the bottom pressing component comprises a bottom pressing piece with a profiling structure, the cross section of the bottom pressing piece is U-shaped and comprises a second bottom and a second protruding portion, the second bottom is used for abutting against the bottom surface of the square battery, and the second protruding portion is used for abutting against a corner area between the bottom surface of the square battery and the first large surface and between the bottom surface of the square battery and the second large surface.

4. The insulation test device according to claim 2 or 3, wherein the lower base plate or the upper pressure plate each has an area smaller than the first large face or the second large face of the prismatic battery, and a space is present between an outer edge of the lower base plate and an outer edge of the first large face and between an outer edge of the upper pressure plate and an outer edge of the second large face, and the first projecting portion and the second projecting portion are capable of completely covering the space.

5. The insulation testing device of claim 2 or 3, wherein the lateral pressing member comprises a first frame and a first conductive silicone block disposed on an inner surface of the first frame, and the bottom pressing member comprises a second frame and a second conductive silicone block disposed on an inner surface of the second frame.

6. The insulation testing device of claim 5, wherein an included angle between the inner side wall of the first protrusion and the first bottom and an included angle between the inner side wall of the second protrusion and the second bottom are both greater than 90 ° and less than or equal to 120 °.

7. The insulation testing device of claim 5, wherein the upper surface of the lower base plate is opposite to the lower surface of the upper pressing plate, the upper surface of the lower base plate is used for abutting against the first large surface of the square battery, the lower surface of the upper pressing plate is used for abutting against the second large surface of the square battery, and the upper surface of the lower base plate and the lower surface of the upper pressing plate are both provided with conductive cloth.

8. The insulation testing device of claim 7, further comprising a positive electrode probe connected to a positive electrode port of the insulation testing device, wherein the positive electrode probe is used for being electrically connected with a positive electrode pole of the square battery; the conductive cloth, the first conductive silica gel block and the second conductive silica gel block are all connected to a negative port of the insulation testing device through leads.

9. The insulation testing apparatus of claim 8, wherein said lateral pressure assembly further comprises a first drive member, said bottom pressure assembly further comprises a second drive member; the first driving piece is connected with the side pressing piece and used for driving the side pressing piece to abut against the first side face or the second side face of the square battery; the second driving piece is connected with the bottom pressing piece and used for driving the bottom pressing piece to abut against the bottom surface of the square battery; the insulation testing device further comprises a third driving piece and a fourth driving piece, wherein the third driving piece is connected with the positive electrode probe and is used for driving the positive electrode probe to press against a positive electrode pole of the square battery; the fourth driving part is connected with the upper pressure plate and used for driving the upper pressure plate to abut against the second large surface of the square battery.

10. The insulation testing apparatus of claim 1, wherein the lower base plate and the upper pressure plate are provided with a protective gasket on a surface thereof adjacent to the side pressing assembly and the bottom pressing assembly.