Sealing coating liquid spraying mechanism for battery cell sealing ring

Abstract

The sealing coating liquid spraying mechanism for the battery cell sealing ring is provided with a nozzle mechanism for spraying out the sealing coating liquid for the battery cell sealing ring, and the nozzle mechanism comprises a joint, a spraying head, a spraying head, a spraying head, a spraying head and a spraying head, wherein the joint is connected with a coating liquid spraying pipe for conveying the sealing coating liquid for the battery cell sealing ring; a first passage through which the sealing coating liquid for the battery core sealing ring flows and passes is formed in the battery core sealing ring; one end part in the length direction of the connecting piece is connected with the joint, and the connecting piece is internally provided with a second passage which receives the sealing coating liquid for the battery core sealing ring from the first passage and enables the sealing coating liquid to flow and pass through; the needle head is connected with the other end part of the connecting piece in the length direction, receives the sealing coating liquid for the battery core sealing ring from the second passage and sprays the sealing coating liquid, the joint is in threaded connection with the connecting piece, and an air-tight O-shaped ring is seamlessly arranged at the threaded connection part along the axial direction of the first passage and the second passage; and the first passage, the second passage and the inner hole of the O-shaped ring are coaxially connected with one another and have the same hole diameter.

Description

TECHNICAL FIELD

[0001] The utility model relates to sealing coating liquid spouting mechanism for electric core sealing ring. BACKGROUND

[0002] With the rapid development of the manufacture of electric core (also including battery), the electric core manufacturing process is required to be efficient and the control is required to be accurate. In particular, for productivity, it is required to be as low as possible while ensuring the efficiency of the manufacture.

[0003] For example, generally, in the assembly of the electric core, the electric core sealing ring is provided between the sealing plate as the positive electrode and the case as the negative electrode of the electric core, and the sealing coating liquid (also referred to as sealant, sealant, etc., sometimes also referred to as "coating liquid" below) for sealing is coated between the sealing plate and the electric core sealing ring and between the case and the electric core sealing ring, respectively, thereby preventing the electrolyte inside the electric core from overflowing and preventing moisture or impurities from the outside of the electric core from entering the inside of the electric core. It should be noted that the spouting mechanism for coating the coating liquid is used for the sealing plate assembly process and the case coating process (i.e., the process of coating the coating liquid on the case) with the installation of the electric core sealing ring as the center. Specifically, the coating positions of the coating liquid are the adhesive bonding positions of the inside of the sealing plate and the electric core sealing ring and the adhesive bonding positions of the outside and the bottom of the case and the electric core sealing ring. In this way, since the electric core monomer is mostly small, especially very small in size like a button cell, the size of the electric core sealing ring used is also miniaturized, and the coating space is limited, and the spouting and coating control of the coating liquid is required to be strict.

[0004] In the current sealing coating liquid spouting mechanism for electric core sealing ring, two general standard joints are used in the nozzle mechanism for the convenience of purchase and use, and on this basis, a workpiece is made to connect the two standard joints to fix the nozzle mechanism and adapt it to the equipment. Figure 1 A cross-sectional view of the nozzle mechanism in the existing sealing coating liquid spouting mechanism for electric core sealing ring is schematically shown. As shown in Figure 1 In the nozzle mechanism, a workpiece 3' is connected between the joint 1' and the joint 2' as standard joints. The joint 1' and the workpiece 3', and the joint 2' and the workpiece 3' are respectively threadedly connected. In addition, a needle 4' for spouting the coating liquid is connected to the side opposite to the workpiece 3' of the joint 2'. In this way, the coating liquid flows from the joint 1' to the needle 4' (the solid arrow direction in Figure 1 In the utility model, the spouting amount and the coating amount of the coating liquid are the same meaning. SUMMARY

[0005] However, in the case of the current nozzle mechanism, the ejection stability of the coating liquid is poor, and the coating amount deviation is large. The reasons are considered to be the following (a) to (c):

[0006] (a) Since the joints 1' and 2' and the workpiece 3' are respectively connected by threads, the connection is not sealed, so no matter how tight the connection is, it is possible for gas to enter from the outside, and gas that is originally dissolved or mixed into the coating liquid can also be precipitated, resulting in a high risk of gas leakage.

[0007] (b) In the machining of the workpiece 3', it is possible that the internal diameter of the standard joint is not fully considered, and in order to facilitate machining, the machining diameter is increased relative to the joints 1' and 2' as standard joints, resulting in a sudden transition from a small diameter to a large diameter in the cross-sectional area of the coating liquid flowing from the joint 1' to the workpiece 3', causing the internal pressure of the coating liquid to decrease instantaneously, and such a drastic change in pressure can easily cause gas (bubbles) to precipitate.

[0008] (c) In order to thread the workpiece 3', a cavity is intentionally left at the threaded portion, which can easily accumulate air.

[0009] Due to the above reasons (a) to (c), the coating amount ejected from the needle 4' is uneven, and the ejection stability of the coating liquid is poor. For example, in the case of manufacturing a button cell, the ejection stability of the coating liquid is more likely to be a problem, and as Figure 1 For example, if the diameter φA' of the joint 1' is set to 2.0 mm, the diameter φB' of the joint 2' is set to 2.0 mm, the diameter φC' of the workpiece 3' is set to 4.4 mm, the diameter φD' of the inlet side of the workpiece 3' connected to the joint 2' is set to 8.0 mm, and the required coating amount is set to 6 mg, the actual output coating amount is about 6 ± 2 mg. Such a large coating amount deviation results in a large number of coating defects. In addition, the large number of components in the nozzle mechanism results in a complex structure, which makes installation difficult and exacerbates the above risks. In this case, the process performance index Ppk as an indicator of the stability of the deviation in manufacturing is only about 0.5, which is far below the acceptable standard of Ppk > 1.67.

[0010] The utility model discloses a sealing coating liquid ejection mechanism for electric core sealing ring, which is completed in view of the above-mentioned problems existing in the prior art, and aims to provide a sealing coating liquid ejection mechanism for electric core sealing ring, which is convenient to install and improves the ejection stability of the coating liquid.

[0011] The present inventors have repeatedly and intensively researched in order to achieve the above-mentioned object. In order to avoid the above-mentioned reasons (a) to (c) as much as possible, the number of components is tried to be reduced, (i) the standard joint, i.e., joint 2' and the processed piece 3' in the original nozzle mechanism are integrally processed to reduce the connection in the mechanism, (ii) in addition, the diameters of the passages through which the coating liquid flows in each component, i.e., the hole diameters are unified to suppress the pressure change, (iii) further, between the joint 1' and the processed piece 3', at the position where the threaded connection has to be used, the O-ring as the gas-tight filler is provided without gap in the inevitable cavity. Thus, the invasion and the outgassing of the gas and the like are suppressed, the coating amount deviation becomes small, and the ejection stability of the coating liquid is improved. In addition, since the number of components is also reduced, the structure of the nozzle mechanism in the coating liquid ejection mechanism becomes simple with respect to the existing structure, the installation becomes easy, and the manufacturability is improved.

[0012] The present utility model is based on the above discovery and is completed, its gist is as follows.

[0013] [1] A sealing coating liquid ejection mechanism for a battery core sealing ring, characterized by comprising a nozzle mechanism that ejects a sealing coating liquid for a battery core sealing ring,

[0014] The above-mentioned nozzle mechanism comprises:

[0015] a joint that is connected to a coating liquid spray pipe that conveys the sealing coating liquid for the battery core sealing ring and has a first passage inside that allows the sealing coating liquid for the battery core sealing ring to flow therethrough;

[0016] a connecting piece that has a second passage inside that receives the sealing coating liquid for the battery core sealing ring from the first passage and allows it to flow therethrough, and whose one end portion in the length direction is connected to the joint; and

[0017] a needle that is connected to the other end portion in the length direction of the connecting piece and receives the sealing coating liquid for the battery core sealing ring from the second passage and ejects it,

[0018] the joint and the connecting piece are threadedly connected,

[0019] at the threaded connection, an O-ring that is gas-tight is provided without gap in the axial direction of the first passage and the second passage,

[0020] the first passage, the second passage, and the inner hole of the O-ring are coaxially connected to each other and have the same hole diameter.

[0021] [2] The sealing coating liquid ejection mechanism for a battery core sealing ring according to [1], characterized in that the hole diameters of the first passage, the second passage, and the inner hole of the O-ring are each within the range of design value x (100% ± 5%).

[0022] [3] The sealant coating liquid ejection mechanism for a battery cell sealing ring according to any one of [1] to [3], characterized in that, in a case where the design value is φ 2.0 mm, the hole diameter of each of the first passage, the second passage, and the inner hole of the O-ring is φ 2.0 ± 0.1 mm.

[0023] [4] The sealant coating liquid ejection mechanism for a battery cell sealing ring according to any one of [1] to [3], characterized in that, at a connection between the connecting member and the needle, a seal sleeve is airtightly wrapped.

[0024] Effect of Invention

[0025] According to the present application, a sealant coating liquid ejection mechanism for a battery cell sealing ring can be provided, which is easy to install and improves the stability of ejection of the coating liquid. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 is a cross-sectional view schematically showing a nozzle mechanism in a conventional sealant coating liquid ejection mechanism for a battery cell sealing ring.

[0027] Figure 2 is a cross-sectional view schematically showing one example of a nozzle mechanism in a sealant coating liquid ejection mechanism for a battery cell sealing ring according to one embodiment of the present application. DETAILED DESCRIPTION

[0028] Hereinafter, a sealant coating liquid ejection mechanism for a battery cell sealing ring according to the present application will be described in detail with reference to the drawings. The embodiments described below are illustrative and merely represent examples of a general or specific description, and various modifications can be made. The numerical values, shapes, materials, component elements, arrangement positions of component elements, connection forms, steps, and order of steps shown in the following embodiments are examples and are not intended to limit the present application. Furthermore, for component elements in the following embodiments that are not recited in the independent claims, the component elements are described as optional component elements. In addition, each drawing disclosed in the present specification is a schematic view. That is, the dimensional ratio on the drawing is not necessarily consistent with the actual dimensional ratio, and the dimensional ratio is not necessarily consistent among the drawings. In each drawing, substantially identical components are denoted by the same reference numerals, and repeated descriptions are omitted or simplified.

[0029] In addition, in the present specification, the terms indicating the relationship between elements and the terms indicating the shape of elements, and the numerical range are not only strictly intended to mean, but also include terms intended to mean substantially equivalent ranges, such as a difference of several percent or so.

[0030] The following is a detailed description of a sealing coating liquid spraying mechanism for a battery cell sealing ring according to one embodiment of the present invention.

[0031] The sealing coating liquid spraying mechanism for battery cell sealing rings of this embodiment includes a nozzle mechanism for spraying the sealing coating liquid for battery cell sealing rings. The nozzle mechanism includes: a connector connected to a coating liquid spray pipe for conveying the sealing coating liquid for battery cell sealing rings, and having a first passage through which the sealing coating liquid for battery cell sealing rings flows; a connector having one end in its longitudinal direction connected to the connector, and having a second passage inside which the sealing coating liquid for battery cell sealing rings is received from the first passage and flows through; and a needle connected to the other end in its longitudinal direction of the connector, receiving the sealing coating liquid for battery cell sealing rings from the second passage and spraying it out. The connector and the connector are threadedly connected. At the threaded connection, an airtight O-ring is seamlessly provided along the axial direction of the first passage and the second passage. The inner holes of the first passage, the second passage, and the O-ring are coaxially connected to each other and have the same diameter.

[0032] Figure 2 The diagram schematically illustrates a cross-sectional view of an example nozzle mechanism in a sealing coating liquid spraying mechanism for a battery cell sealing ring according to one embodiment of the present invention. Figure 2 As shown, the sealing coating liquid spraying mechanism 100 for battery cell sealing rings includes a nozzle mechanism 10 for spraying sealing coating liquid (hereinafter sometimes simply referred to as "coating liquid") for battery cell sealing rings. The nozzle mechanism 10 includes: a connector 11 connected to a coating liquid spray pipe (not shown) for conveying the coating liquid, and having a first passage 11a through which the coating liquid flows; a connector 12, one end of which is connected to the connector 11 in the longitudinal direction, and having a second passage 12a inside which the coating liquid is received from the first passage 11a and flows through; and a needle 13 connected to the other end of the connector 12 in the longitudinal direction, receiving the coating liquid from the second passage 12a and spraying it out. The connector 11 and the connector 12 are threadedly connected. At the threaded connection, an airtight O-ring 14 is seamlessly provided along the axial direction of the first passage 11a and the second passage 12a. The inner holes of the first passage 11a, the second passage 12a and the O-ring 14 are coaxially connected to each other and have the same hole diameter.

[0033] Thus, in the case where the coating liquid is sprayed from the needle 13 in the nozzle mechanism 10 under the pressure of the coating pump, since the aperture of the passage passing through the nozzle mechanism 10 is unified, the gas is not caused to be separated due to the change in the internal aperture. Further, by the integrated design and processing of the connecting member 12, the number of components is reduced, thereby reducing the number of connection sites which reduce the sealing property, and the generation of air leakage and the like can be suppressed. Furthermore, by providing the O-ring 14 for filling the air-tightness of the inevitable cavity without a gap at the connection site of the joint 11 and the connecting member 12, which is a site where the threaded connection has to be used, the generation of air leakage and the like is further suppressed, and the accumulation of air is suppressed. As a result, the coating amount deviation is small, and the spraying stability of the coating liquid is improved. Further, since the number of components is reduced, the structure of the nozzle mechanism becomes simple with respect to the existing structure, the installation becomes easy, and the manufacturability is improved.

[0034] Hereinafter, the sealing coating liquid spraying mechanism 100 for the battery cell sealing ring will be described in detail. Figure 2 The sealing coating liquid spraying mechanism 100 for the battery cell sealing ring according to the present embodiment will be described in detail.

[0035] In the present embodiment, as shown in FIG. 1, in the nozzle mechanism 10, the coating liquid flows under the pressure of the coating pump not shown and sequentially passes through the joint 11, the O-ring 14, the connecting member 12, and the needle 13 (solid arrow direction in FIG. 1). Figure 2 Figure 2 In the joint 11, one end (left end side of the joint 11 in FIG. 1) is connected to the coating nozzle, and then the coating nozzle is connected to the coating pump, and further the coating pump is connected to the coating liquid tank body in which the coating liquid is stored. Thus, the coating liquid flows from the coating liquid tank body to the first passage 11a of the joint 11 via the coating nozzle under the pressure of the coating pump. Note that the coating nozzle, the coating pump, and the coating liquid tank body described above are not related to the improvement of the present application, and although not shown, are included in the sealing coating liquid spraying mechanism 100 for the battery cell sealing ring. Further, the joint 11 (i.e., the joint 1' in FIG. 1) is generally used as a standard joint, and the combination with the coating nozzle is fixed and has good connection adaptability, and thus it is necessary to use in consideration of the flow stability of the entire coating liquid. Thus, the subsequent components are improved in cooperation with the joint 11.

[0036] Figure 2 Figure 1

[0037] ​​​​The coating liquid flows to the second passage 12a of the connecting member 12 after passing through the first passage 11a of the joint 11. Here, since the connecting member 12 is designed and processed to be integrated and only one end thereof in the length direction is connected to the joint 11 compared to the conventional structure of two members combined, the flow of the coating liquid in the entire length direction of the connecting member 12 becomes relatively stable without pressure variation, air leakage, and the like, and the flow becomes smooth. Further, since the number of components is reduced, the structure becomes simple, the installation becomes easy, and the manufacturability is improved. Note that the outer shape of the connecting member 12 can be appropriately designed and processed according to the actual situation as long as the flow and output of the coating liquid are not affected. For example, the design, processing, and the like can be performed in coordination with the installation of the nozzle mechanism 10.

[0038] Here, at the threaded connection of the joint 11 and the connecting member 12, an air-tight O-ring 14 is provided without a gap in the axial direction of the passage, and the O-ring 14 fills the cavity of the connection of the two. The cavity is inevitably generated due to the processing of the threaded connection and the like. As described above, such a cavity not only easily causes air leakage but also can cause the generation of gas. From the viewpoint of suppressing the generation of the above problems, the air-tight O-ring 14 is provided without a gap. Further, the inner hole of the O-ring 14 and the first passage 11a of the joint 11 and the second passage 12a of the connecting member 12 are coaxially connected to each other and have the same hole diameter. Thus, the coating liquid flows in the same uniform passage when flowing from the joint 11 to the connecting member 12, and as a result, the generation of air leakage, the generation of gas, and the accumulation of air and the like do not occur, the flow becomes smooth, and the stability of the coating is good. Note that the inner hole of the O-ring refers to the hole inside the O-ring.

[0039] Further, the sizes of the first passage 11a, the second passage 12a, and the inner hole of the O-ring 14 can be uniformly set according to the actual needs. In addition, as described above, since the joint 11 is generally a standard joint, the second passage 12a and the inner hole of the O-ring 14 can be uniformly set according to the hole diameter of the first passage 11a of the joint 11. For example, in the case where the hole diameter φA of the first passage 11a of the joint 11 is 2.0 mm, the second passage 12a and the inner hole of the O-ring 14 are also set to φ 2.0 mm. Note that the hole diameters of the first passage 11a and the second passage 12a refer to the diameters of the respective transverse cross sections of the first passage 11a and the second passage 12a, and the hole diameter of the inner hole of the O-ring 14 refers to the diameter of the transverse cross section of the inner hole. In other words, the transverse cross sections of the first passage 11a, the second passage 12a, and the inner hole of the O-ring 14 are identical.

[0040] The respective hole diameter size errors of the first passage 11a, the second passage 12a, and the inner hole of the O-ring 14 are set to be within a range of ±5%, that is, the respective hole diameters are within a range of the design value x (100% ± 5%). For example, in the case where the design value is φ 2.0 mm, the respective hole diameter sizes of the first passage 11a, the second passage 12a, and the inner hole of the O-ring 14 are φ 2.0 ± 0.1 mm. It is preferable that the respective hole diameter size errors be set to be within a range of ±3%, more preferably within a range of ±2%, further preferably within a range of ±1%, and most preferably that the error be "0".

[0041] The coating liquid flows to the needle 13 after passing through the second passage 12a of the connector 12, and is then ejected from the front end of the needle 13 and applied to the sealing plate or the case as the target. The needle 13 needs to be appropriately replaced depending on the target battery cell or process, etc. However, it is considered that, although the inner diameters of the second passage 12a of the connector 12 and the needle 13 are mostly different, such a change in hole diameter is not drastic compared to the other changes, and thus has a small influence on the ejection stability of the coating liquid. In addition, in order to ensure the air tightness and connectivity at the connection between the connector 12 and the needle 13, an outer sleeve body, that is, a seal sleeve (not shown) having high air tightness and being tight is provided outside the connection between the two.

[0042] According to the sealing liquid ejection mechanism for a battery cell sealing ring of the above-described embodiment, the ejection stability of the coating liquid is good, and the coating amount deviation is small. For example, in the case of manufacturing a button cell, when the respective hole diameters are uniformly set to φ 2.0 mm and the required coating amount is set to 6 mg, the actual output coating amount is about 6 ± 0.7 mg, the deviation is significantly reduced compared to the existing coating amount of 6 ± 2 mg, and Ppk becomes Ppk > 2.0, which is higher than the qualification standard of Ppk > 1.67, and the coating defects are significantly reduced. In addition, since the structure of the nozzle mechanism becomes simple, the installation becomes easy, and the manufacturability is improved.

[0043] In addition, as described above, the sealing liquid ejection mechanism for a battery cell sealing ring of the present embodiment is used in the sealing plate assembly process and the case coating process (that is, the process of applying the coating liquid to the case) with the installation of the battery cell sealing ring as the center. Hereinafter, one example of the overall process flow of the coating process of the coating liquid will be described with the case coating process as an example.

[0044] The housing coating process as an example is used for the manufacture of the battery cell, especially the manufacture of the button cell. In the housing coating process, the inner wall of the housing of the battery cell, for example, the housing of the button cell, is coated with a sealing coating liquid. The housing, for example, after sequentially passing through the following mechanisms, completes the coating of the coating liquid on the inner wall: a vibratory bowl feed mechanism, a housing transfer mechanism, a housing positioning mechanism, a main turntable mechanism, a housing coating mechanism, an image inspection mechanism, a transfer mechanism to a belt-type conveying line, a housing inner coating liquid drying mechanism, and a housing material receiving mechanism.

[0045] In the vibratory bowl feed mechanism, the housing scattered in the material is arranged in a row by the vibration of the vibratory bowl, and is transported to the downstream mechanism.

[0046] In the housing transfer mechanism, the housing arranged in a row from the upstream mechanism is sucked by a vacuum chuck, and is transferred to the downstream housing positioning mechanism.

[0047] In the housing positioning mechanism, the housing is pressed by a V-shaped groove, so that the position of the housing is consistent with the main turntable mechanism downstream.

[0048] In the main turntable mechanism, the housing is rotated and conveyed. It should be noted that the subsequent housing coating mechanism and image inspection mechanism are both completed in the main turntable mechanism.

[0049] In the housing coating mechanism, the coating liquid is uniformly coated on the inner wall and the inner bottom edge of the housing, and the coating position corresponds to the outer side and the bottom of the battery cell sealing ring. Here, in the housing coating mechanism, the sealing coating liquid spraying mechanism for the battery cell sealing ring in the utility model is used.

[0050] In the image inspection mechanism, it is detected whether the coating in the housing coating mechanism has defects, and the defective products detected are recycled.

[0051] In the transfer mechanism to the belt-type conveying line, the housing detected as a good coating product is transferred from the main turntable mechanism to the belt-type conveying line.

[0052] In the housing inner coating liquid drying mechanism, high-temperature drying of the coating liquid is performed. The temperature of the drying is generally about 70°C.

[0053] In the housing material receiving mechanism, the housing after high-temperature drying is collected in the material receiving box.

[0054] It should be noted that the above-mentioned coating process of the housing is only an example, and as long as the coating liquid can be stably and accurately coated to the target position of the housing by the sealing coating liquid spraying mechanism for the battery cell sealing ring in the utility model, it is not limited to the above-mentioned process.

[0055] The above has described the present application according to the presently preferred embodiments, but should not be construed as limiting the disclosed content. Various modifications and changes will be apparent to those skilled in the art with the reading of the above disclosure. Therefore, the appended claims should be construed as including all modifications and changes without departing from the true spirit and scope of the present application.

[0056] Industrial applicability

[0057] According to the present application, a sealing coating liquid ejection mechanism for battery cell sealing rings can be provided with convenience in installation and improved stability in ejection of the coating liquid.

[0058] Explanation of symbols

[0059] 100 sealing coating liquid ejection mechanism for battery cell sealing rings

[0060] 10 nozzle mechanism

[0061] 11 connector

[0062] 11a first passage

[0063] 12 connecting member

[0064] 12a second passage

[0065] 13 needle

[0066] 14 O-ring

Claims

1. A mechanism for spraying a sealing coating liquid onto a battery cell sealing ring, characterized in that, It has a nozzle mechanism that sprays a sealing coating liquid onto the battery cell sealing ring. The nozzle mechanism includes: The connector is connected to a coating liquid spray nozzle for conveying the sealing coating liquid for the battery cell sealing ring, and has a first passage inside for the sealing coating liquid for the battery cell sealing ring to flow and pass through. A connector, one end of which is connected to the joint in the longitudinal direction, and having inside a second passage for receiving and allowing the sealing liquid for the cell sealing ring from the first passage to flow through; and The needle is connected to the other end of the connector along its length and receives and sprays out the sealing liquid for the cell sealing ring from the second passage. The connector and the connecting piece are connected by threads. At the threaded connection, an airtight O-ring is seamlessly provided along the axial direction of the first and second passages. The first passage, the second passage, and the inner hole of the O-ring are coaxially connected to each other and have the same diameter.

2. The sealing coating liquid spraying mechanism for the battery cell sealing ring according to claim 1, characterized in that, The diameter of the first passage, the second passage, and the inner hole of the O-ring are each within the range of design value × (100% ± 5%).

3. The sealing coating liquid spraying mechanism for the battery cell sealing ring according to claim 2, characterized in that, With the design value of φ2.0mm, the diameter of the first passage, the second passage, and the inner hole of the O-ring is φ2.0±0.1mm.

4. The sealing coating liquid spraying mechanism for the battery cell sealing ring according to any one of claims 1 to 3, characterized in that, At the connection between the connector and the needle, a sealing sleeve is provided for airtight sealing.

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