Sealing method between pole sleeve and cover plate of battery cell

Abstract

The invention provides a sealing method between a pole sleeve and a cover plate of a battery cell, and relates to the technical field of battery processing and manufacturing. The sealing method comprises the steps that the mounting through hole is formed in the cover plate; the pole sleeve is inserted into the mounting through hole of the cover plate; injecting a liquid sealing material so as to fill a gap between the pole sleeve and the mounting through hole, and enabling the sealing material to overflow from the mounting through hole; sealing materials overflow from the two ends of the mounting through hole; extruding the sealing material overflowing out of the mounting through hole so as to enable the sealing material to be attached to the end face of the cover plate and the outer surface of the pole; and the sealing material is subjected to curing treatment, so that the sealing material is cured, and the sealing element is formed. The sealing method can be suitable for mounting through holes and pole sleeves of different sizes, cylindrical surface sealing and end face sealing of the mounting through holes can be achieved at the same time, operation is simplified, and production efficiency is improved.

Description

Technical Field

[0001] The present application relates to the technical field of battery processing and manufacturing, and in particular to a sealing method between a pole sleeve and a cover plate of a battery cell. Background Art

[0002] The battery cell includes a cover plate and a pole, wherein a through hole is provided on the cover plate, and a sleeve is installed in the through hole. During assembly, the pole is inserted into the sleeve, thereby fixing the pole. There is a clearance fit between the sleeve and the through hole, and both ends of the sleeve extend out of the through hole. In order to ensure sealing, a sealing treatment is required between the sleeve and the cover plate.

[0003] In the existing assembly process, a first sealing ring is arranged between the through hole of the cover plate and the sleeve, and the first sealing ring is completely located in the through hole to achieve cylindrical sealing of the inner wall of the through hole, wherein, in order to install and position the first sealing ring, an annular positioning groove corresponding to the first sealing ring is also arranged on the inner wall of the through hole. Since both ends of the sleeve extend out of the through hole, in order to improve the sealing effect, a second sealing ring needs to be pressed on each of the two ends of the through hole, wherein the second sealing ring is partially located in the through hole and partially extends out of the through hole, thereby achieving end face sealing of the end faces on both sides of the through hole.

[0004] In the prior art, when sealing the through hole of the cover plate and the sleeve, multiple sealing members need to be used, which results in cumbersome operation and low assembly efficiency. Summary of the invention

[0005] The purpose of the present application is to overcome the defects of the prior art and provide a sealing method between a pole sleeve and a cover plate of a battery cell to solve the problems in the prior art.

[0006] In order to solve the above problems, an embodiment of the present application provides a sealing method between a pole sleeve and a cover plate of a battery cell, comprising:

[0007] A mounting through hole is provided on the cover plate;

[0008] Inserting the pole sleeve into the mounting through hole of the cover plate;

[0009] Injecting liquid sealing material to fill the gap between the pole sleeve and the mounting through hole, and allowing the sealing material to overflow from the mounting through hole; wherein the sealing material overflows from both ends of the mounting through hole;

[0010] Extruding the sealing material overflowing from the mounting through hole so that the sealing material fits with the end surface of the cover plate and the outer surface of the pole;

[0011] The sealing material is subjected to a curing treatment so that the sealing material is cured and forms a sealing member.

[0012] In a possible implementation manner, before the sealing material is injected into the mounting through hole, the sealing material is heated so that the sealing material is in a molten state.

[0013] In a possible implementation manner, when the sealing material overflowing from the mounting through hole is squeezed, the pressure applied to the sealing material gradually increases until a preset pressure is reached.

[0014] In a possible implementation, the sealing material is cooled to solidify the sealing material and form the sealing member; or the sealing material is irradiated with light of a preset wavelength to solidify the sealing material and form the sealing member; wherein,

[0015] Portions of the sealing member outside the two ends of the mounting through hole are all exposed portions, and the outer contour of the exposed portions is cylindrical.

[0016] In a possible implementation, the size of the exposed portion is detected, and when the size of the exposed portion meets a preset size, the seal is determined to be qualified.

[0017] In a possible implementation manner, after the pole sleeve is inserted into the mounting through hole, a relative position between the pole sleeve and the mounting through hole is detected;

[0018] When the pole sleeve and the mounting through hole are in a coaxial state, the sealing material is injected into the mounting through hole; wherein, if the pole sleeve and the mounting through hole are not coaxial, the position of the pole sleeve is adjusted.

[0019] In a possible implementation manner, after the pole sleeve is inserted into the mounting through hole, the pole sleeve and the cover plate are photographed to obtain an image;

[0020] The image is analyzed to determine whether the pole sleeve is coaxial with the mounting through hole.

[0021] In a possible implementation, analyzing the image includes:

[0022] converting the image into a vector graph;

[0023] Obtain the center of the pole sleeve and the center of the mounting through hole in the vector diagram;

[0024] Measuring the distance between the center of the pole sleeve and the center of the mounting through hole;

[0025] When the distance is smaller than a preset threshold, it is determined that the pole sleeve and the mounting through hole are in a coaxial state.

[0026] In a possible implementation manner, the shooting angle of the image is directly opposite to the cover plate.

[0027] In a possible implementation, the sealing material includes polytetrafluoroethylene, EPDM rubber or fluororubber.

[0028] The beneficial effects of this application include:

[0029] The sealing method between the pole sleeve and the cover plate of the battery cell proposed in the present application uses a sealing material to fill the gap between the pole sleeve and the mounting through hole, wherein, during the process of injecting the sealing material, the sealing material overflows from the mounting through hole; thereafter, the sealing material overflowing from the mounting through hole is squeezed so that the sealing material fits with the end face of the cover plate and the outer surface of the pole.

[0030] The sealing method can be applied to mounting through holes and pole sleeves of different sizes, and can simultaneously achieve cylindrical surface sealing and end surface sealing of the mounting through hole, thereby simplifying operation and improving production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0032] Figure 1 A flow chart showing a sealing method between a pole sleeve and a cover plate of a battery cell;

[0033] Figure 2 A schematic diagram of a cover plate is shown;

[0034] Figure 3 A schematic diagram showing the assembly of a pole sleeve and a cover plate is shown;

[0035] Figure 4 Shows Figure 3 The front view in;

[0036] Figure 5 A schematic diagram of the connection between a pole sleeve, a cover plate and a seal is shown;

[0037] Figure 6 Shows Figure 5 A cross-sectional view of

[0038] Figure 7 A schematic diagram of a seal is shown;

[0039] Figure 8A schematic diagram showing the assembly of a pole sleeve, a cover plate and an extrusion tooling is shown;

[0040] Fig. 9 Shows Figure 8 A cross-sectional view of

[0041] Fig.10 A flow chart of image analysis is shown.

[0042] Description of main component symbols:

[0043] 100-pole sleeve; 200-cover plate; 210-mounting through hole; 211-gap; 300-seal; 310-exposed part; 400-extrusion tooling; 410-inner cavity. DETAILED DESCRIPTION

[0044] The embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application, and cannot be understood as limiting the present application.

[0045] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0046] Example

[0047] See also Figure 1-Figure 6 In this embodiment, a sealing method between a pole sleeve and a cover plate of a battery cell is proposed, comprising:

[0048] S11, opening a mounting through hole 210 on the cover plate 200;

[0049] S12, inserting the pole sleeve 100 into the mounting through hole 210 of the cover plate 200;

[0050] S13, injecting liquid sealing material to fill the gap 211 between the pole sleeve 100 and the mounting through hole 210, and making the sealing material overflow from the mounting through hole 210; wherein the sealing material overflows from both ends of the mounting through hole 210;

[0051] S14, squeezing the sealing material overflowing from the mounting through hole 210 so that the sealing material fits the end surface of the cover plate 200 and the outer surface of the pole;

[0052] S15 , performing a curing process on the sealing material so that the sealing material is cured and forms a sealing member 310 .

[0053] The sealing material includes materials with sealing properties such as polytetrafluoroethylene, EPDM rubber or fluororubber.

[0054] After the sealing material is extruded and formed, the sealing material is cooled and solidified to form the sealing member 300 .

[0055] Reference Figure 2-Figure 7 , the cover plate 200 can be fixed in advance, and the pole sleeve 100 is inserted into the mounting through hole 210 of the cover plate 200 by a manipulator, and both ends of the pole sleeve 100 extend out of the mounting through hole 210; then, a sealing material is injected into the gap 211 between the pole sleeve 100 and the mounting through hole 210, wherein the sealing material needs to completely fill the gap 211, thereby achieving the cylindrical sealing of the mounting through hole 210. By injecting an excessive amount of sealing material, the sealing material can overflow out of the mounting through hole 210, and there is overflow of sealing material at both ends of the mounting through hole 210; then, the sealing material overflowing the mounting through hole 210 is squeezed, so that the sealing material fits the end face of the cover plate 200 and the outer surface of the pole, thereby achieving the end face sealing of the mounting through hole 210.

[0056] Before the sealing material is injected into the mounting through hole 210 , the sealing material is heated so that the sealing material is in a molten state.

[0057] When squeezing the sealing material overflowing the mounting through hole 210, the pressure applied to the sealing material gradually increases until it reaches a preset pressure. During the process of injecting the sealing material, air may be mixed into the sealing material and bubbles may be formed. By applying gradually increasing pressure to the sealing material, the air therein can be discharged, thereby making the sealing material more tightly sealed, thereby achieving a better sealing effect. If the instantaneous pressure applied is too large, it may cause the bubbles to burst, resulting in gaps at the location of the bubbles, thereby affecting the reliability of the seal.

[0058] Reference Figure 8-Figure 9 After the pole sleeve 100 is inserted into the mounting through hole 210 of the cover plate 200, an extrusion tool 400 can be respectively mounted on both ends of the pole sleeve 100, and the inner cavity 410 of the extrusion tool 400 is connected to the gap 211. By injecting sealing material into the inner cavity 410 of the extrusion tool 400, the gap 211 between the pole sleeve 100 and the mounting through hole 210 is filled, and the part overflowing outside the through hole will flow into and be constrained in the inner cavity 410 of the extrusion tool 400.

[0059] The extrusion tool 400 may be provided with an injection hole, and an injection needle is inserted into the injection hole, and the sealing material is injected into the gap 211 between the pole sleeve 100 and the mounting through hole 210 through the injection needle.

[0060] After the sealing material is injected, pressure is applied to the extrusion tool 400 to extrude the sealing material, so that the gap 211 between the pole sleeve 100 and the mounting through hole 210 and the inner cavity 410 of the extrusion tool 400 are completely filled with the sealing material, completing the extrusion and shaping of the sealing material.

[0061] In this embodiment, after the extrusion is completed, the sealing material is cooled so that the sealing material solidifies and forms the sealing member 300. Before the sealing material solidifies, the pole sleeve 100 and the cover plate 200 are both in a temperature-adjustable chamber. By adjusting the temperature in the chamber, the sealing material can remain in a flowable state, thereby facilitating extrusion and shaping.

[0062] In other embodiments, a sealant capable of light curing may be used to achieve sealing between the pole sleeve 100 and the cover plate 200. For such a sealant, during curing, light of a preset wavelength is irradiated to the sealant, so that the sealant is cured to form a seal 300. The irradiated light is usually ultraviolet light.

[0063] Reference Figure 7 , wherein the portions of the seal 300 outside the two ends of the mounting through hole 210 are all exposed portions 310, and the outer contours of the exposed portions 310 are all cylindrical. The seal 300 is integrally formed and has a better sealing effect. The portion between the two exposed portions 310 is located in the mounting through hole 210, and is used to achieve sealing of the gap 211.

[0064] After the sealant is cured to form the seal 300, the size of the exposed portion 310 is detected. When the size of the exposed portion 310 meets the preset size, the seal 300 is determined to be qualified. The diameters of the two exposed portions 310 are both larger than the diameter of the mounting through hole 210, and the height of each exposed portion 310 is 1 to 12 mm.

[0065] In this embodiment, after the pole sleeve 100 is inserted into the mounting through hole 210, the relative position between the pole sleeve 100 and the mounting through hole 210 is detected. When the pole sleeve 100 and the mounting through hole 210 are in a coaxial state, a sealing material is injected into the mounting through hole 210. If the pole sleeve 100 and the mounting through hole 210 are not coaxial, the position of the pole sleeve 100 is adjusted.

[0066] After the pole sleeve 100 is inserted into the mounting through hole 210 , the pole sleeve 100 and the cover plate 200 are photographed to obtain an image; the image is analyzed to determine whether the pole sleeve 100 and the mounting through hole 210 are coaxial.

[0067] The shooting angle of the image is directly opposite to the cover plate 200. Figure 4 As shown, the image obtained by photographing the pole sleeve 100 and the cover plate 200 is a front view.

[0068] like Fig.10 As shown, the analysis of the image includes the following steps:

[0069] S21, converting the image into a vector graph;

[0070] S22, obtaining the center of the pole sleeve 100 and the center of the mounting through hole 210 in the vector diagram;

[0071] S23, measuring the distance between the center of the pole sleeve 100 and the center of the mounting through hole 210;

[0072] S24, when the distance is less than the preset threshold, it is determined that the pole sleeve 100 and the mounting through hole 210 are in a coaxial state.

[0073] After the image is converted into a vector diagram, the dimensions of the pole sleeve 100 and the cover plate 200 in the vector diagram are consistent with their actual dimensions, as long as the difference between the dimensions is within the tolerance range.

[0074] The vector diagram includes dimension measurement. By measuring the distance between the center of the pole sleeve 100 and the center of the mounting through hole 210, it can be determined whether the pole sleeve 100 and the mounting through hole 210 are coaxial. The vector diagram can be infinitely scaled without losing image quality. Therefore, by enlarging the vector diagram, the center of the pole sleeve 100 and the center of the mounting through hole 210 can be determined, and the distance between the two centers can be accurately measured.

[0075] The sealing method proposed in this embodiment has the following advantages:

[0076] It can be applicable to installation through holes 210 and pole sleeves 100 of different sizes, so there is no need to select a sealing ring of corresponding size according to the size of the gap 211 and the inner diameter of the installation through hole 210;

[0077] The sealing member 300 is formed in one step, and can simultaneously realize the cylindrical sealing and the end face sealing of the mounting through hole 210, thereby simplifying the operation and improving the production efficiency;

[0078] The sealing material has fluidity and can adapt to the size of the gap 211 to fill the gap 211 and achieve a better sealing effect.

[0079] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0080] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the present application. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present application.

Claims

1. A sealing method between a pole sleeve and a cover plate of a battery cell, characterized in that: include: A mounting through hole is provided on the cover plate; Inserting the pole sleeve into the mounting through hole of the cover plate; Injecting liquid sealing material to fill the gap between the pole sleeve and the mounting through hole, and allowing the sealing material to overflow from the mounting through hole; wherein the sealing material overflows from both ends of the mounting through hole; Extruding the sealing material overflowing from the mounting through hole so that the sealing material fits with the end surface of the cover plate and the outer surface of the pole; The sealing material is subjected to a curing treatment so that the sealing material is cured and forms a sealing member.

2. The sealing method between the pole sleeve and the cover plate of the battery cell according to claim 1, characterized in that: Before the sealing material is injected into the mounting through hole, the sealing material is heated so that the sealing material is in a molten state.

3. The sealing method between the pole sleeve and the cover plate of the battery cell according to claim 2, characterized in that: When the sealing material overflowing from the mounting through hole is squeezed, the pressure applied to the sealing material gradually increases until a preset pressure is reached.

4. The sealing method between the pole sleeve and the cover plate of the battery cell according to claim 1, characterized in that: The sealing material is cooled to solidify the sealing material and form the sealing member; or the sealing material is irradiated with light of a preset wavelength to solidify the sealing material and form the sealing member; wherein, Portions of the sealing member outside the two ends of the mounting through hole are all exposed portions, and the outer contour of the exposed portions is cylindrical.

5. The sealing method between the pole sleeve and the cover plate of the battery cell according to claim 4, characterized in that: The size of the exposed portion is detected, and when the size of the exposed portion meets a preset size, the seal is determined to be qualified.

6. The sealing method between the pole sleeve and the cover plate of the battery cell according to claim 1, characterized in that: After the pole sleeve is inserted into the mounting through hole, a relative position between the pole sleeve and the mounting through hole is detected; When the pole sleeve and the mounting through hole are in a coaxial state, the sealing material is injected into the mounting through hole; wherein, if the pole sleeve and the mounting through hole are not coaxial, the position of the pole sleeve is adjusted.

7. The sealing method between the pole sleeve and the cover plate of the battery cell according to claim 6, characterized in that: After the pole sleeve is inserted into the mounting through hole, the pole sleeve and the cover plate are photographed to obtain an image; The image is analyzed to determine whether the pole sleeve is coaxial with the mounting through hole.

8. The sealing method between the pole sleeve and the cover plate of the battery cell according to claim 7, characterized in that: The analysis of the images includes: converting the image into a vector graph; Obtain the center of the pole sleeve and the center of the mounting through hole in the vector diagram; Measuring the distance between the center of the pole sleeve and the center of the mounting through hole; When the distance is smaller than a preset threshold, it is determined that the pole sleeve and the mounting through hole are in a coaxial state.

9. The sealing method between the pole sleeve and the cover plate of the battery cell according to claim 7, characterized in that: The image is taken at an angle facing the cover plate.

10. The sealing method between the pole sleeve and the cover plate of the battery cell according to claim 1, characterized in that: The sealing material includes polytetrafluoroethylene, EPDM rubber or fluororubber.

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