Cylindrical battery hot-pressing formation tool

Abstract

The utility model discloses a cylindrical battery hot-pressing formation tool which is used for clamping a finished cylindrical battery and is arranged in hot-pressing formation equipment, and relates to the technical field of battery formation. Comprising two mounting bases which are arranged in an abutting mode, limiting grooves are formed in the two mounting bases, and the two limiting grooves are in butt joint with each other to form an anti-expansion containing cavity equivalent to a cylindrical battery in size. According to the hot-pressing formation tool for the cylindrical battery, the cylindrical battery is limited in the anti-expansion accommodating cavity, so that expansion deformation of the cylindrical battery in the hot-pressing formation process is prevented, and the hot-pressing formation tool is high in practicability.

Description

TECHNICAL FIELD

[0001] The utility model relates to battery formation technical field especially relates to a cylindrical battery hot press formation frock. BACKGROUND

[0002] Hot press formation equipment usually includes a sealed pressure vessel, and the vessel is provided with a heating and pressure control system; and the battery hot press formation process refers to placing the battery in the pressure vessel, then heating and pressurizing the vessel, and performing initial charging and discharging on the battery, so that the electrolyte in the battery is more uniformly distributed, and the operation of the battery is activated.

[0003] However, when the battery is subjected to hot press formation treatment, the electrolyte in the battery will decompose under high temperature and high pressure, thereby generating gas and causing the battery to swell.

[0004] In addition, during the battery charging and discharging activation process, a solid electrolyte interface (SEI) film will be generated on the surface of the negative electrode sheet, and gas will also be generated during the formation of the SEI film, causing the battery to swell.

[0005] To this end, the prior art discloses a formation frock, which includes a base, a connecting assembly, and a plurality of pressing plates. The plurality of pressing plates are slidably connected to the base and can slide relative to the base along a first direction perpendicular to the pressing plates. The connecting assembly is connected to the plurality of pressing plates and can limit the movement of the plurality of pressing plates relative to each other. The formation frock is movably arranged on the base by the plurality of pressing plates, so that the plurality of pressing plates can move relative to the base and hold an electric core between two adjacent pressing plates. By simultaneously holding multiple electric cores by the plurality of pressing plates, multiple electric cores can be worked simultaneously, improving the overall work efficiency. In addition, the plurality of pressing plates can move along the first direction perpendicular to the pressing plates, so that the plurality of pressing plates are arranged in order, facilitating the operator to check the electric core held between the plurality of pressing plates while working, and preventing mistakes. In addition, the movement of the plurality of pressing plates relative to each other can be limited by the connecting assembly, so that the plurality of pressing plates can stably hold the electric core, ensuring the stability and high efficiency of the electric core processing.

[0006] However, the above-mentioned device still has the following defects:

[0007] 1. It cannot be used to hold cylindrical batteries.

[0008] 2. This fixture cannot prevent battery expansion and deformation. Specifically, since only the pressure plates at both ends of the base along the first direction can be restrained and limited by the fixing members at both ends of the connecting assembly, the other pressure plates can actually still move within the area between these two pressure plates. Therefore, when multiple batteries are placed on the base and clamped by multiple pressure plates, except for the pressure plates at both ends which cannot move outward, the other pressure plates can actually be pushed by the expansion of the batteries. Furthermore, the expansion pressure of multiple batteries cannot be exactly the same, which leads to the following: the battery with a large expansion deformation pressure can still expand by squeezing the battery with a small expansion deformation pressure, while the battery with a small expansion deformation pressure is squeezed and flattened by the battery with a large expansion deformation pressure. Therefore, this fixture cannot actually be used to prevent battery expansion. Utility Model Content

[0009] This utility model provides a cylindrical battery hot-pressing formation tooling, in which the cylindrical battery is confined within an anti-expansion receiving cavity to prevent it from expanding and deforming during the hot-pressing formation process, thereby solving at least one of the above-mentioned technical problems.

[0010] The technical solution of this utility model to solve the above problems is: to provide a cylindrical battery hot pressing formation tooling for clamping finished cylindrical batteries and set in a hot pressing formation equipment. The tooling includes two mounting seats that are pressed together. Each of the two mounting seats has a limiting groove. The two limiting grooves are connected to each other to form an anti-expansion accommodating cavity with a size equivalent to that of the cylindrical battery.

[0011] Furthermore, a flexible pad is provided on the wall of the limiting groove.

[0012] Furthermore, the flexible pad is an elastic pad.

[0013] Furthermore, the tooling also includes a push cylinder, one of the mounting seats being fixedly disposed at the shaft end of the output telescopic shaft of the push cylinder, and the push cylinder being disposed opposite the other of the mounting seats.

[0014] Furthermore, multiple push cylinders are provided, and the multiple push cylinders are evenly distributed along the length direction of the tooling.

[0015] Furthermore, the tooling also includes a fixedly installed abutment limiting block, and the mounting base and the abutment limiting block, which are fixedly connected to the push cylinder shown, are disposed opposite to each other on both sides of another mounting base.

[0016] Furthermore, multiple abutment limiting blocks are provided, and the multiple abutment limiting blocks are evenly distributed on the side of the mounting base.

[0017] Further, the tool further comprises a guiding assembly, the guiding assembly comprises a guiding limiting rod and guiding holes opened on the mounting seats along the length direction of the tool.

[0018] Further, the mounting seat is an electric heating mounting seat.

[0019] Further, the limiting grooves are equidistantly provided with a plurality of limiting grooves along the length direction of the tool.

[0020] The tool has the advantages that:

[0021] 1. The two mounting seats abut against each other, so that the two limiting grooves abut against each other, thereby forming a complete anti-expansion accommodating cavity, so as to limit the cylindrical battery in an anti-expansion manner, and to limit the expansion of the cylindrical battery.

[0022] 2. The device can accommodate and limit a plurality of cylindrical batteries at the same time.

[0023] 3. The anti-expansion accommodating cavity is provided with a flexible cushion layer, so that the anti-expansion accommodating cavity has a tolerable accommodation error, so as to facilitate loading of the cylindrical battery with a certain size error.

[0024] 4. By arranging the flexible cushion layer in the anti-expansion accommodating cavity, the cylindrical battery is allowed to have a small and tolerable expansion deformation in the hot-pressing formation process, so as to prevent the cylindrical battery shell from being broken due to excessive gas pressure in the cylindrical battery.

[0025] 5. The mounting seat can be disassembled, so as to facilitate the technician to load the cylindrical battery. BRIEF DESCRIPTION OF DRAWINGS

[0026] The accompanying drawings, which are incorporated into and form a part of the specification, illustrate embodiments of the present application and, together with the description, serve to explain the principles of the present application. In these drawings, like reference numerals are used to represent similar elements. The drawings in the following description are some embodiments of the present application, not all embodiments. For those skilled in the art, other drawings can be obtained from these drawings without creative labor.

[0027] Figure 1 It is a top view of the overall structure of the tool of the present embodiment;

[0028] Figure 2 It is a structural view of the mounting seat of the present embodiment;

[0029] 11-mounting seat, 12-limiting groove, 13-anti-expansion accommodating cavity, 14-flexible cushion layer, 15-pushing cylinder, 16-abutting limiting block, 17-guiding assembly, 171-guiding limiting rod, 172-guiding hole. DETAILED DESCRIPTION

[0030] The orientation terms such as up, down, left, right, front, back, top, bottom, etc. mentioned or possibly mentioned in the present specification are defined relative to the configuration shown in the drawings, and the words "inner" and "outer" refer to the direction towards or away from the geometric center of a particular component, which are relative concepts, so it is possible to change accordingly according to different positions, different use states. Therefore, these or other orientation terms should not be interpreted as restrictive terms.

[0031] Please refer to Figure 1 and Figure 2 , with reference to Figure 1 , a cylindrical battery hot pressing formation tool of a specific embodiment of the utility model, for clamping finished cylindrical batteries, and is arranged in a hot pressing formation device, which mainly comprises two abuttingly arranged mounting seats 11, both of which are cuboids, and the shapes and specifications of the two mounting seats 11 are completely the same, and the overall tool formed by the abutting of the two mounting seats 11 left and right is also a cuboid. In addition, limit grooves 12 are formed at the positions of the side walls of the two mounting seats 11 abutting against each other, and the limit grooves 12 are semicylindrical grooves; when the two mounting seats 11 abut against each other, the limit grooves 12 of the two mounting seats 11 abut against each other to form a complete cylindrical anti-expansion accommodating cavity 13, and the size and specification of the anti-expansion accommodating cavity 13 are the same as those of a certain type of cylindrical battery.

[0032] In this case, when the technician puts the corresponding type of cylindrical battery into the anti-expansion accommodating cavity 13, the two mounting seats 11 abut against each other under the action of external pressure and maintain the shape of the cylindrical battery before the hot pressing formation process, and the side wall of the anti-expansion accommodating cavity 13 limits the expansion of the cylindrical battery during the hot pressing formation process, so as to ensure that the shape of the cylindrical battery does not change and reduce the scrap rate.

[0033] It should be noted that: the tool of the embodiment can only be used for a certain type and specification of cylindrical battery, and the tool of the embodiment also corresponds to multiple sizes for different types and specifications of cylindrical batteries.

[0034] Further, please refer to Figure 1 , in the embodiment, in order to make the tool applicable to multiple cylindrical batteries at the same time, four limit grooves 12 are equally spaced on the two mounting seats 11 along the length direction of the mounting seat 11 or the tool, and when the two mounting seats 11 are arranged abutting against each other, the four limit grooves 12 of the two mounting seats 11 are arranged abutting against each other in pairs to form four anti-expansion accommodating cavities 13.

[0035] It should be noted that in other embodiments, the limiting grooves 12 on one mounting seat 11 can be one, two, three, five or more.

[0036] Further, due to inevitable dimensional errors, different cylindrical batteries of the same model also have slight size differences, and in order to adapt the tooling of the present embodiment to such differences, please refer to Figure 1 and Figure 2 In the present embodiment, the mutually contacting side wall surfaces of the two mounting seats 11, and the groove walls of the plurality of limiting grooves 12 opened on the side wall surfaces are each provided with a flexible pad layer 14; the flexible pad layer 14 is made of a high-temperature-resistant elastic material TPE, and the initial thickness of the flexible pad layer 14 is 1-3 mm, so that the cylindrical battery with an actual radius that is 0-3 mm larger than the radius of the anti-expansion accommodating cavity 13 can also be put into the anti-expansion accommodating cavity 13 by extruding the flexible pad layer 14.

[0037] In addition, in addition to being able to adapt to the size errors of different cylindrical batteries of the same model, the flexible pad layer 14 can also allow the cylindrical battery to have an allowable and non-affecting overall appearance shape of the cylindrical battery. That is, after the cylindrical battery with a size specification that is comparable to the size specification of the anti-expansion accommodating cavity 13 is put into the anti-expansion accommodating cavity 13, the subsequent cylindrical battery can run its appropriate expansion in the hot-pressing formation process, and the expansion pressure of the cylindrical battery when it expands can also be deformed by the flexible pad layer 14 to be appropriately absorbed, thereby preventing the cylindrical battery from being directly supported and cracked or broken by the shell of the cylindrical battery due to the direct hard contact of the cylindrical battery with the cavity wall of the anti-expansion accommodating cavity 13.

[0038] Further, please refer to Figure 1 and refer to the orientation shown in Figure 1 In the present embodiment, the device for abutting the two mounting seats 11 against each other includes a pushing air cylinder 15 and an abutting limiting block 16; wherein the abutting limiting block 16 is provided with three, the three abutting limiting blocks 16 are equidistantly arranged along the length direction of the mounting seat 11, and the three abutting limiting blocks 16 are respectively arranged on the left side of the mounting seat 11 on the left side in Figure 1 The three abutting limiting blocks 16 are all fixedly arranged on the external equipment; the pushing air cylinder 15 is provided with three, the three pushing air cylinders 15 are equidistantly arranged and all vertically face the mounting seat 11, and the shaft ends of the output telescopic shafts of the three pushing air cylinders 15 are all fixedly connected with the mounting seat 11 on the right side.

[0039] To this end, the skilled person can control the three pushing cylinders 15 to operate synchronously, thereby pushing the right mounting seat 11 to move leftwards to abut against the left mounting seat 11 which is limited by the three abutting limiting blocks 16, and locking the current position of the right mounting seat 11 to avoid its reverse rollback to the right under the expansion of the cylindrical battery, thereby limiting the over-expansion of the cylindrical battery.

[0040] It should be noted that in the present embodiment, the maximum deformation thinning of the flexible pad 14 does not exceed 1mm when the pushing cylinder 15 pushes the right mounting seat 11 to abut against the left mounting seat 11.

[0041] It should be noted that in other embodiments, the specific number of abutting limiting blocks 16 can be one, two, four or more, and the number of pushing cylinders 15 can also be one, two, four or more.

[0042] Further, in the present embodiment, please refer to Figure 2 , and refer to the orientation shown in Figure 2 , in order to improve the abutting accuracy of the two mounting seats 11 and ensure that the corresponding limiting grooves 12 on the two mounting seats 11 can be accurately butted against each other, the tooling further comprises a guide assembly 17.

[0043] Specifically, the guide assembly 17 comprises guide limiting rods 171 and guide holes 172, and each mounting seat 11 is provided with two guide holes 172 at both ends, and the guide limiting rods 171 are four in number, each guide rod simultaneously passes through one guide hole 172 on each mounting seat 11, the diameter of the guide rod is equivalent to the diameter of the guide hole 172, and the surface of the guide rod is smooth and coated with lubricating oil.

[0044] In this way, when the pushing cylinder 15 works to push the right mounting seat 11 in Figure 1 to move, the right mounting seat 11 can be aligned with the left mounting seat 11 in Figure 1 through the guide assembly 17, so as to ensure that the two mounting seats 11 can be accurately butted against each other.

[0045] In addition, in the present embodiment, the two mounting seats 11 are both electrically heated mounting seats.

[0046] The above-mentioned matters not mentioned are applicable to the prior art.

[0047] It should be finally pointed out that: the above examples are only used to illustrate the technical solutions of the utility model, and not limit it. Although the utility model has been explained in detail with reference to the foregoing examples, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing examples, or make equivalent replacement to part of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the utility model.

Claims

1. A cylindrical battery hot-pressing formation tool for clamping a finished cylindrical battery and disposed in a hot-pressing formation apparatus, characterized by, The tooling comprises two abuttingly arranged mounting bases (11), each of the two mounting bases (11) is provided with a limiting groove (12), and the two limiting grooves (12) are in abutment with each other to form an anti-expansion accommodating cavity (13) with a size corresponding to the cylindrical battery.

2. The tooling of claim 1, wherein, A flexible pad layer (14) is arranged at the groove wall of the limiting groove (12).

3. The tooling of claim 2, wherein, The flexible pad layer (14) is an elastic pad layer.

4. The tooling of claim 1 wherein, The tooling further comprises pushing air cylinders (15), one of the mounting bases (11) is fixedly arranged at the shaft end of the output telescopic shaft of the pushing air cylinder (15), and the pushing air cylinder (15) is arranged opposite to the other mounting base (11).

5. The tooling of claim 4, wherein, A plurality of pushing air cylinders (15) are arranged, and the plurality of pushing air cylinders (15) are uniformly distributed along the length direction of the tooling.

6. The tooling of claim 4 wherein, The tooling further comprises fixedly arranged abutting limiting blocks (16), and the mounting base (11) fixedly connected with the pushing air cylinder (15) and the abutting limiting block (16) are arranged opposite to each other on both sides of the other mounting base (11).

7. The tooling of claim 6 wherein, A plurality of abutting limiting blocks (16) are arranged, and the plurality of abutting limiting blocks (16) are uniformly distributed on the side of the mounting base (11).

8. The tooling of claim 1 wherein, The tooling further comprises a guiding assembly (17), the guiding assembly (17) comprises a guiding limiting rod (171) and guiding holes (172) arranged on the mounting base (11) along the length direction of the tooling, and the guiding limiting rod (171) is arranged in the guiding holes (172) on the two mounting bases (11) at the same time.

9. The tooling of claim 1 wherein, The mounting base (11) is an electric heating mounting base.

10. The tooling of claim 1 wherein, A plurality of limiting grooves (12) are equidistantly arranged along the length direction of the tooling.

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