Welding tip and hot welding machine

Abstract

According to the present disclosure, there may be provided a fusion tip of a hot fusion machine that thermally fuses a boss or a rib to secure a component and a substrate after assembling the component and the substrate including the boss or the rib, and a hot fusion machine that may include: a base tip that includes a base portion and a base portion; comprising a needle hole vertically formed in the center of the needle hole and a tip head, and the tip head makes contact with the boss or the rib when hot welding is carried out; and a welding needle located in the needle hole and configured to be separated from the base tip and move up and down.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to a fusion tip and a heat fusion machine including the same. BACKGROUND

[0002] Heat fusion, also known as thermoplastic fusion, refers to a method of combining two different materials. Heat fusion is a technique of transferring heat energy to a surface of a product made of a thermoplastic resin, raising the surface of the product to be fused to a melting point, and then performing pressurization and cooling to join.

[0003] For example, when combining a base material and a component of different materials by heat fusion, a boss or rib formed on the component is inserted into the base material, and then the inserted boss or rib is heated and pressed and then cooled to deform the shape of the boss or rib. The base material and the component are fixedly combined through the deformed boss or rib.

[0004] On the other hand, the heat fusion method can be applied in the process of manufacturing an electrode, a battery module, or a battery pack. SUMMARY

[0005] (1) Technical problem to be solved

[0006] On the other hand, when heat fusion is performed after a boss or rib of a component is inserted into an insertion hole formed in a base material, an empty space, i.e., a gap, can be formed between the boss or rib and the insertion hole. The gap can form a space in which the component is not fixed to the base material and is movable, thereby reducing the bonding force between the component and the base material.

[0007] According to one aspect of the present disclosure, a gap formed between a component and a base material can be reduced.

[0008] (2) Technical solution

[0009] According to the fusion tip of the present disclosure, which is a fusion tip of a heat fusion machine that heat-fuses a boss or rib after assembling a component including the boss or rib and a base material to fix the component and the base material, the fusion tip can include a base tip including a needle hole vertically formed in the center thereof and including a tip head that contacts the boss or rib when heat fusion is performed, and a fusion needle located in the needle hole and configured to be separated from the base tip and move up and down.

[0010] According to one embodiment, the fusion needle can include a main body portion and an auxiliary needle, the auxiliary needle can have a smaller cross-sectional area than the main body portion, and the auxiliary needle can be disposed toward the boss or rib.

[0011] According to one embodiment, the auxiliary needle can include a first auxiliary needle having a smaller cross-sectional area than the main body portion and a second auxiliary needle having a smaller cross-sectional area than the first auxiliary needle, the first and second auxiliary needles can be disposed toward the boss or rib.

[0012] According to one embodiment, the auxiliary needle can protrude toward the boss or rib and be fixed.

[0013] According to another embodiment, the auxiliary needle can be configured to be embedded in the main body portion and protrude toward the boss or rib when heat welding is performed.

[0014] According to still another embodiment, the welding needle can include a needle head in contact with the boss or rib, the needle head can include an undercut portion recessed toward the inside of the welding needle.

[0015] According to still another embodiment, the welding needle can include a needle head in contact with the boss or rib, the needle head can further include a coating layer on the surface thereof in contact with the boss or rib.

[0016] According to one embodiment, an elastomer can be further included, the elastomer can be connected with the welding needle, the elastomer can be configured to be compressed to accommodate the welding needle in the needle hole when heat welding is performed.

[0017] On the other hand, a heat welding machine according to the present disclosure, which heat welds a boss or rib to fix a component and a base material after assembling the component and the base material including the boss or rib, can include a welding tip, and a moving member, the welding tip can include a base tip including a needle hole vertically formed in the center thereof and including a tip head in contact with the boss or rib when heat welding is performed, and a welding needle located in the needle hole and configured to be separated from the base tip and move up and down, the moving member can be configured to be connected with the welding needle and move the welding needle up and down.

[0018] According to one embodiment, the moving member can include a motor and a driving shaft connected with the welding needle, the motor can move the welding needle up and down by rotating the driving shaft.

[0019] According to another embodiment, the moving member can include an actuator connected with the welding needle, the actuator can move the welding needle up and down by moving a piston.

[0020] (Three) Beneficial Effects

[0021] According to one embodiment of the present disclosure, a gap formed between a component and a base material can be reduced. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 (a) of FIG. 1 and Figure 1 (b) of FIG. 1 are flowcharts showing heat staking with a conventional staking tip.

[0023] Figure 2 is a perspective view showing a staking tip according to the present disclosure.

[0024] Figure 3 (a) of FIG. 2, Figure 3 (b) of FIG. 2, Figure 4 (a) of FIG. 3 and Figure 4 (b) of FIG. 3 are flowcharts showing heat staking with a staking tip according to the present disclosure.

[0025] Figure 5 (a) of FIG. 4 and Figure 5 (b) of FIG. 4 are cross-sectional views showing a variant of a staking needle.

[0026] Figure 6 (a) of FIG. 5 and Figure 6 (b) of FIG. 5 are cross-sectional views showing yet another variant of a staking needle.

[0027] Figure 7 (a) of FIG. 6 and Figure 7 (b) of FIG. 6 are cross-sectional views showing a variant of a needle head of a staking needle.

[0028] Figure 8 (a) of FIG. 7 and Figure 8 (b) of FIG. 7 are cross-sectional views of a staking tip including an elastomer.

[0029] Figure 9 (a) of FIG. 8 and Figure 9 (b) of FIG. 8 are cross-sectional views showing a portion of a heat staking machine according to the present disclosure.

[0030] Figure 10 is a cross-sectional view showing a portion of a battery cell to which a heat staking method according to the present disclosure is applied.

[0031] Figure 11 is a cross-sectional view showing a battery module to which a heat staking method according to the present disclosure is applied.

[0032] Figure 12 is a plan view showing a battery pack to which a heat staking method according to the present disclosure is applied.

[0033] BRIEF DESCRIPTION OF REFERENCE NUMERALS:

[0034] 1: conventional staking tip G: gap

[0035] 10: component 11: boss or rib

[0036] 12: bonding head 20: base material

[0037] 21: insertion hole 100: welding tip

[0038] 110: base tip 111: needle hole

[0039] 112: tip head 120: welding needle

[0040] 121: main body 122: auxiliary needle

[0041] 123: elastomer 124: needle head

[0042] 125: undercut 126: coating

[0043] 130: moving part 200: battery module

[0044] 210: cell 211: negative terminal

[0045] 212: positive terminal 213: insulator

[0046] 214: current collector 220: lower frame

[0047] 230: upper frame 240: bus bar

[0048] 250: reinforcing member DETAILED DESCRIPTION

[0049] Embodiments of the present disclosure are described in detail below with reference to the accompanying drawings. In the following description, detailed description of configurations that make the technical idea of the present disclosure obscure or known configurations is omitted for convenience of explanation.

[0050] The following examples are provided to more completely explain the present application to those having ordinary skill in the art to which the present application pertains. The following examples are provided to help understand the present application, and the technical idea of the present application is not necessarily limited to the specific examples described below. The present disclosure should be understood to broadly include various equivalents, alternatives, and modifications of the technical idea explained in the following examples.

[0051] The terms used in the following examples are provided to more completely explain the specific examples from the above-described perspective. Therefore, the terms used in the following examples should not be interpreted as narrowing, limiting, or restricting the use of the technical idea of the present disclosure.

[0052] In the following description, unless explicitly excluded in the context, the singular expression can be interpreted to include the plural. In addition, in the following description, the expression "include" means that the described configuration, component, operation, feature, step, number, etc. is present, and does not mean the exclusion of one or more other configurations, components, operations, features, steps, numbers, etc. are added.

[0053] Before the disclosure is detailed, it is to be understood that the terminology or glossary used in the following description and throughout the specification, including the claims, is not intended to limit the scope of the present disclosure, and was not intended to be limited to a general meaning or a meaning in a dictionary, but was intended to be interpreted as a meaning and concept in accordance with the technical idea of the present disclosure based on the principle that the inventor can appropriately define the concept of the terminology in order to describe the utility model in the best way. Therefore, it should be understood that the configuration shown in the embodiments described in the specification and the drawings is only the most preferred embodiment of the present disclosure, and does not represent all technical ideas of the present disclosure, and various equivalents and modifications that can replace them can exist at the time of filing the present application.

[0054] Hereinafter, preferred embodiments according to the present disclosure will be described in detail with reference to the accompanying drawings. At this time, it should be noted that the same components in the drawings are represented by the same reference numerals as much as possible. In addition, detailed descriptions of known functions and configurations that can obscure the gist of the present disclosure will be omitted. Based on the same reason, some components in the drawings are exaggerated, omitted, or schematically shown, and the size of each component does not completely reflect the actual size. For example, in the specification, the expressions of upper side, upper portion, upper, lower side, lower portion, lower, side, etc. are described based on the drawing as a reference, and if the direction of the corresponding object is changed, it can be described differently.

[0055] Hereinafter, a fusion tip according to the present disclosure, a hot fusion machine including the fusion tip, and a hot fusion method using the hot fusion machine will be described in detail with reference to the accompanying drawings.

[0056] The fusion tip according to the present disclosure can be a configuration of a hot fusion machine. The hot fusion machine can be a device for fixing a part and a base material. The part can be a material that is deformed in shape when heated and solidified in a deformed shape when cooled. For example, the part can include a thermoplastic. The part can include a boss or a rib. The boss or the rib can be configured to be inserted into the base material and can include a protruding shape. The base material can include an insertion hole into which the boss or the rib is inserted. The base material and the part can be assembled by inserting the boss or the rib into the insertion hole. After assembly, the hot fusion machine can heat and press the boss or the rib inserted into the insertion hole through the fusion tip to deform the shape of the boss or the rib, and then cool to bond the base material and the part.

[0057] Figure 1 (a) of FIG. 1 is a flowchart showing a hot fusion process using a conventional fusion tip. Figure 1 (b) of FIG. 1 is a state after fusion. Figure 1 (a) of FIG. 1 is a state before fusion, Figure 1 (b) of FIG. 1 is a state after fusion.

[0058] Referring to Figure 1 (a) and Figure 1of (b), a gap (Gap) G can not be filled after thermal fusion. The gap G can be an empty space between the boss or rib 11 and the base material 20. The end of the fusion tip 1 can include a circular shape that is recessed inward of the fusion tip 1. When thermal fusion is performed with this fusion tip 1, the boss or rib 11 can melt and move. Since the degree of deformation in the horizontal direction of the lower portion of the melted boss or rib 11 is small, the gap G can not be filled.

[0059] For example, when thermal fusion is performed, the upper portion of the melted boss or rib 11 can move and deform in the horizontal direction of the upper portion along the circular shape of the fusion tip 1, and the amount of downward movement is insufficient, so the gap G can not be filled. The gap G formed in the insertion hole 21 can provide a space for the boss or rib 11 to move sufficiently. Therefore, the component 10 can not be fixed to the base material 20 and can move, so the bonding force between the component 10 and the base material 20 can be reduced. In particular, when applied to a product such as a car that vibrates strongly, the component 10 can shake due to continuous vibration, resulting in a significant reduction in bonding force.

[0060] Figure 2 is a perspective view showing a fusion tip 100 according to the present disclosure, Figure 3 of (a), Figure 3 of (b), Figure 4 of (a), and Figure 4 of (b) are flowcharts showing thermal fusion performed with the fusion tip 100 according to the present disclosure.

[0061] Referring to Figures 2 to 4 of (b), the fusion tip 100 can include a base tip 110 and a fusion pin 120. Figures 2 to 4 of (b) omits the moving part 130 which will be described later.

[0062] The base tip 110 occupies the largest portion of the fusion tip 100, and can have a form that surrounds the fusion pin 120 located at the center.

[0063] The base tip 110 can include a pin hole 111 formed vertically at the center thereof. The pin hole 111 can be a space for accommodating the fusion pin 120. The cross-sectional shape of the pin hole 111 can be similar to the cross-section of the fusion pin 120.

[0064] The base tip 110 may include a tip head 112. The tip head 112 may be configured to contact the boss or rib 11 during heat welding. For example, the tip head 112 may be located at the lower part of the base tip 110. The tip head 112 may include various shapes. For example, the tip head 112 may include a circular shape recessed inwards from the base tip 110. Therefore, after heat welding, the boss or rib 11 may form a joint head 12 with a circular shape on its upper part. The cross-sectional area of ​​the joint head 12 may be larger than the cross-sectional area of ​​the insertion hole 21, so that the component 10 and the substrate 20 can be joined.

[0065] The welding pin 120 can be configured to separate from the base tip 110 and move vertically. The welding pin 120 can be located in the pin hole 111. The welding pin 120 can move vertically while inserted into the pin hole 111. In this case, the pin hole 111 can provide guidance for the movement of the welding pin 120. The welding pin 120 can separate from the base tip 110 and move. For example, with the base tip 110 remaining stationary and fixed, only the welding pin 120 can move downward to apply pressure to the boss or rib 11. Similarly, with the welding pin 120 fixed, the base tip 110 can move. For example, with the welding pin 120 applying pressure to and fixing the boss or rib 11, the base tip 110 can move downward to apply pressure to the boss or rib 11.

[0066] The welding pin 120 can first heat and pressurize the center of the boss or rib 11 to fill the gap G. See below for reference. Figure 3 (a) to Figure 4 (b) explains the principle of filling gap G. Figure 3 (a) to Figure 4 (b) illustrates a process of heat welding using the welding tip 100 of a heat welding machine according to the present disclosure, wherein the heat welding is performed according to... Figure 3 (a) to Figure 4 The order of (b) is followed.

[0067] Reference Figure 3 (a) to Figure 4 (b) The heat fusion welding method may include an insertion step, a first fusion welding step, and a second fusion welding step.

[0068] Figure 3 (a) illustrates the preparation step. The preparation step may be the step of preparing a boss or rib 11 of the component 10 to be inserted into the insertion hole 21 of the substrate 20. For example, a boss or rib 11 formed on the component 10 may be inserted into an insertion hole 21 formed in the substrate 20. The cross-sectional area of ​​the insertion hole 21 may be larger than the cross-sectional area of ​​the boss or rib 11.

[0069] Figure 3(b) shows a first welding step. The first welding step can be a step of heating and pressing the boss or rib 11 using the welding needle 120. Specifically, the center portion of the boss or rib 11 can be heated and pressed using the welding needle 120. The first welding step can be a step of heating and pressing the center portion of the boss or rib 11 to fill the space between the boss or rib 11 and the insertion hole 21 of the base material 20. In the first welding step, the boss or rib 11 can be heated and pressed using the welding tip 100 including the base tip 110 and the welding needle 120 separated from the base tip 110 and moving up and down. The welding needle 120 can be separated from the base tip 110 and move up and down. In the first welding step, the welding needle 120 can be separated from the base tip 110 and move downward to heat and press the center portion of the boss or rib 11, however, in the case of the welding tip 100 shown in (a) including the elastic body 123, at least a portion of the welding needle 120 can protrude from the needle hole 111. In the first welding step, the base tip 110 can not press the boss or rib 11, only the welding needle 120 can press the boss or rib 11. The center portion of the boss or rib 11 can be melted and move downward. The melted boss or rib 11 can move in the horizontal direction while moving downward. Accordingly, the lower portion of the boss or rib 11 can expand in the horizontal direction and fill the empty space, i.e., the gap G, between the boss or rib 11 and the insertion hole 21. Figure 8 In the case of the welding tip 100 shown in (a) including the elastic body 123, at least a portion of the welding needle 120 can protrude from the needle hole 111. In the first welding step, the base tip 110 can not press the boss or rib 11, only the welding needle 120 can press the boss or rib 11. The center portion of the boss or rib 11 can be melted and move downward. The melted boss or rib 11 can move in the horizontal direction while moving downward. Accordingly, the lower portion of the boss or rib 11 can expand in the horizontal direction and fill the empty space, i.e., the gap G, between the boss or rib 11 and the insertion hole 21.

[0070] Figure 4 (a) shows a second welding step. The second welding step can be a step of heating and pressing the remaining portion of the boss or rib 11 to fix the member 10 and the base material 20. In the second welding step, the boss or rib 11 can be heated and pressed using the welding tip 100 including the base tip 110 and the welding needle 120 separated from the base tip 110 and moving up and down. In the second welding step, the remaining portion of the boss or rib 11 can be heated and pressed using the base tip 110 while the center portion of the boss or rib 11 is heated and pressed using the welding needle 120. The remaining portion referred to herein can mean the remaining portion of the boss or rib 11 other than the portion heated and pressed using the welding needle 120. The base tip 110 can be lowered and heat and press the remaining portion. At this time, the welding needle 120 can be in a state of pressing the center portion of the boss or rib 11. That is, the base tip 110 can be lowered and press the remaining portion in a state where the welding needle 120 is fixed. The remaining portion can be melted and deformed in correspondence with the shape of the tip head 112 of the base tip 110 to form the joint head 12.

[0071] Figure 4 (b) shows a state where the welding ends. The welding tip 100 can be raised, and the molten bonding head 12 can be cooled. The bonding head 12 can be cooled and solidified in a deformed state.

[0072] Figure 5 (a) of FIG. 1, and Figure 5 (b) of FIG. 1 is a cross-sectional view showing a modification of the welding needle 120, Figure 6 (a) of FIG. 1, and Figure 6 (b) of FIG. 1 is a cross-sectional view showing another modification of the welding needle 120.

[0073] Referring to Figure 5 (a) to Figure 6 (b) of FIG. 1, the welding needle 120 can include a main body part 121 and an auxiliary needle 122. Figure 5 (a) of FIG. 1, and Figure 6 (a) of FIG. 1 is enlarged to show a plurality of modifications of the welding needle 120.

[0074] The main body part 121 can be a main body of the welding needle 120.

[0075] The auxiliary needle 122 can have a smaller cross-sectional area than the main body part 121. For example, when the cross-sections of the main body part 121 and the auxiliary needle 122 are circular, the diameter of the auxiliary needle 122 can be smaller than the diameter of the main body part 121. The auxiliary needle 122 can be disposed toward or face the boss or rib 11.

[0076] The auxiliary needle 122 can include a first auxiliary needle 122a having a smaller cross-sectional area than the main body part 121 and a second auxiliary needle 122b having a smaller cross-sectional area than the first auxiliary needle 122a. That is, the auxiliary needle 122 can include smaller auxiliary needles 122 in order as needed. Accordingly, the auxiliary needle 122 can include a plurality of additional auxiliary needles 122 to form an N-stage structure. The first auxiliary needle 122a and the second auxiliary needle 122b can be disposed toward or face the boss or rib 11.

[0077] Referring to Figure 5 (a) of FIG. 1, and Figure 5of (b), the auxiliary needle 122 can protrude toward and be fixed to the boss or rib 11. The first auxiliary needle 122a and the second auxiliary needle 122b can protrude and be fixed. For example, the first auxiliary needle 122a can protrude from the main body part 121 toward the boss or rib 11. Also, the second auxiliary needle 122b can protrude from the first auxiliary needle 122a toward the boss or rib 11. The first auxiliary needle 122a and the second auxiliary needle 122b can be fixed in a state of protruding. Accordingly, the main body part 121 of the fusion needle 120, the first auxiliary needle 122a, the second auxiliary needle 122b can be sequentially disposed, and can include a stepped form in which the cross-sectional area gradually decreases. The auxiliary needle 122 can include a third auxiliary needle, a fourth auxiliary needle, or an Nth auxiliary needle as necessary to form an N-stage structure.

[0078] Referring to Figure 6 of (a) and Figure 6 of (b), the auxiliary needle 122 can be configured to be embedded in the main body part 121. The embedded auxiliary needle 122 can be configured to protrude toward the boss or rib 11 when heat fusion is performed. Accordingly, the auxiliary needle 122 can include a shape similar to the fusion tip 100 of Figure 4 when heat fusion is performed. Also, even in the case of the embedded auxiliary needle 122, an Nth auxiliary needle can be included to form an N-stage structure. Although not shown in the drawing, there can be various ways in which the auxiliary needle protrudes from the embedded state. For example, each auxiliary needle can be individually moved in combination with a spring, an actuator structure, or the like, which will be described later.

[0079] Through the N-stage structure of the auxiliary needle, the fusion needle 120 can concentrate the center part of the boss or rib 11 and push down. For example, compared to the 0-stage structure without the auxiliary needle, the 2-stage structure can make the center part relatively more lowered. The capacity of the boss or rib 11 that is melted and moved downward can be sufficient to fill the gap G.

[0080] Figure 7 of (a) and Figure 7 of (b) are cross-sectional views showing a variation of the needle head 124 of the fusion needle 120.

[0081] Referring to Figure 7 of (a) and Figure 7 of (b), the fusion needle 120 can include a pin head 124.

[0082] The pin head 124 can be a part of the fusion needle 120. The pin head 124 can be in contact with the boss or rib 11. That is, the pin head 124 can be an end part of the fusion needle 120.

[0083] Figure 7(a) of FIG. 1 shows various shapes of the needle 124. From the top, a general needle 124, a needle 124 including an undercut 125, and a needle 124 including a coating 126 are shown.

[0084] In general, the face of the needle 124 that contacts the boss or rib 11 can be a flat face. However, the shape of the needle 124 can be formed in various shapes.

[0085] The needle 124 can include an undercut 125. The undercut 125 can be formed to be concave toward the inside of the fusing needle 120. The undercut 125 can accommodate a portion of the melted boss or rib 11. The boss or rib 11 can have high viscosity even if it is melted. Accordingly, the boss or rib 11 accommodated in the undercut 125 can provide a guiding effect that bonds the fusing needle 120 to prevent the position of the fusing needle 120 from deviating during the descent of the fusing needle 120.

[0086] The needle 124 can further include a coating 126. The coating 126 can be formed on the face of the needle 124 that contacts the boss or rib 11. The face of the needle 124 that contacts the boss or rib 11 can have a problem of corrosion or deformation when it contacts the melted boss or rib 11. Accordingly, the needle 124 can include the coating 126 to prevent these problems. The coating 126 can include various coating substances according to various purposes such as chemical resistance, corrosion resistance, discharge, etc.

[0087] The shape of the needle 124 described above is merely an example and is not necessarily limited thereto, and the needle 124 can include various shapes.

[0088] Figure 8 (a) of FIG. 1 and Figure 8 (b) of FIG. 1 is a cross-sectional view showing the fusing tip 100 including the elastomer 123.

[0089] Referring to Figure 8 (a) of FIG. 1 and Figure 8 (b) of FIG. 1, the fusing tip 100 can further include the elastomer 123. Figure 8 (a) of FIG. 1 shows a state before the elastomer 123 is compressed, Figure 8 (b) of FIG. 1 shows a state after the elastomer 123 is compressed.

[0090] The elastomer 123 can be connected with the fusing needle 120. For example, one side of the elastomer 123 can be combined with the fusing needle 120, and the other side can be combined with the base tip 110. The elastomer 123 can be accommodated in the needle hole 111.

[0091] The elastic body 123 can be configured to be compressed when heat welding is performed to allow the welding needle 120 to be accommodated in the needle hole 111. For example, before heat welding, the welding needle 120 can protrude at least partially outside the needle hole 111 due to the elasticity of the elastic body 123. When heat welding begins, the welding tip 100 descends, and the welding needle 120 can first come into contact with the boss or rib 11. Due to the elasticity of the elastic body 123, the welding needle 120 can pressurize the boss or rib 11. As the boss or rib 11 is pressurized, the resistance gradually increases, and the elastic body 123 can contract under the resistance. As the elastic body 123 contracts, the welding needle 120 can be entirely accommodated in the needle hole 111.

[0092] Figure 9 (a) of FIG. 1 and Figure 9 (b) of FIG. 1 is a cross-sectional view showing a portion of a heat welding machine according to the disclosure.

[0093] Referring to Figure 9 (a) of FIG. 1 and Figure 9 (b) of FIG. 1 and Figure 3 (a) to Figure 4 (b) of FIG. 1, the heat welding machine can include the welding tip 100 and the moving member 130.

[0094] The welding tip 100 of the heat welding machine can be any one of the welding tips 100 described above.

[0095] The moving member 130 can be a configuration that moves the welding needle 120. The moving member 130 can be configured to be connected with the welding needle 120 and to move the welding needle 120 up and down.

[0096] The shape of the moving member 130 and the principle of moving the welding needle 120 are not limited. Therefore, the following examples are merely examples of the moving member 130 and are not necessarily limited thereto.

[0097] The moving member 130 can include a motor and a driving shaft. The motor can rotate the driving shaft. The type of the motor is not limited as long as it is capable of applying a sufficient rotational force to rotate the driving shaft. The driving shaft can be connected with and rotated by the welding tip. When the driving shaft is rotated, the welding tip can move up and down. At this time, although not shown in the drawing, a guide groove can be formed between the welding needle 120 and the base tip 110 to prevent the welding tip from rotating together with the driving shaft. The motor and the driving shaft can move the welding needle 120 up and down, and the welding needle 120 can pressurize the boss or rib 11.

[0098] In addition, the moving part 130 can include an actuator connected with the fusion tip 120. The actuator can move the fusion tip 120 up and down. For example, the actuator can include a piston structure. The actuator can move the fusion tip 120 up and down by moving the piston. The piston can be combined with the fusion tip 120 to move the fusion tip 120 up and down. The actuator can inject or discharge fluid or air through a hose. The actuator can move the piston by adjusting hydraulic or pneumatic pressure, thereby moving the fusion tip 120.

[0099] Figure 10 is a cross-sectional view showing a part of an electric cell 210 to which a heat fusion method according to the present disclosure is applied, Figure 11 is a cross-sectional view showing a battery module 200 to which a heat fusion method according to the present disclosure is applied, Figure 12 is a plan view showing a battery pack to which a heat fusion method according to the present disclosure is applied.

[0100] Figures 10 to 12 An example in which a heat fusion method according to the present disclosure is applied to the manufacturing of a battery assembly is shown. Figures 10 to 12 Enlarged cross-sectional views of a component 10 and a base material 20 bonded by heat fusion are shown, respectively.

[0101] Referring to Figures 10 to 12 , a heat fusion method according to the present disclosure can be applied to the manufacturing of a battery assembly. For example, in the heat fusion method, a preparation step can be a step of preparing the component 10 and the base material 20 included in the battery assembly. The battery assembly can be a concept including an electric cell 210, a battery module 200, a battery pack. The heat fusion method according to the present disclosure can be a method using a fusion tip 100 or a heat fusion machine according to the present disclosure.

[0102] A heat fusion method according to the present disclosure can be applied to the manufacturing of an electric cell 210. For example, the component 10 and the base material 20 can be any one configuration of the electric cell 210, respectively. The electric cell 210 can include an insulator 213 and a current collector 214. The insulator 213 can be made of an insulating material such as plastic. The current collector 214 can be made of a material having electrical conductivity such as metal. The insulator 213 and the current collector 214 can be combined with each other. The heat fusion method can be applied when the current collector 214 and the insulator 213 are combined. At this time, the insulator 213 can be the component 10, and the current collector 214 can be the base material 20. The insulator 213 can include a boss or a rib 11, and the current collector 214 can include an insertion hole 21. After the boss or the rib 11 of the insulator 213 is inserted into the insertion hole 21 of the current collector 214, heat fusion can be performed.

[0103] The thermal welding method of the present disclosure can be applied to the manufacturing of a battery module 200. The part 10 and the base material 20 can be any one configuration of the battery module 200 or the battery pack, respectively. The battery module 200 can include a plurality of battery cells 210 and a housing. The battery module 200 can accommodate the plurality of battery cells 210. Each battery cell 210 can be a secondary battery. The battery module 200 can include a housing composed of a lower frame 220 and an upper frame 230. The lower frame 220 can include an inner hollow space to accommodate the plurality of battery cells 210. After the plurality of battery cells 210 are accommodated in the lower frame 220, the upper frame 230 can be coupled to the lower frame 220.

[0104] In the process of coupling the upper frame 230 to the lower frame 220, the thermal welding method can be applied. For example, the upper portion of the lower frame 220 can be formed with a boss or rib 11. The upper frame 230 can be formed with an insertion hole 21 into which the boss or rib 11 can be inserted. At this time, the lower frame 220 can be the part 10, and the upper frame 230 can be the base material 20. After the boss or rib 11 of the lower frame 220 is inserted into the insertion hole 21, thermal welding can be performed using the welding tip 100 or the thermal welding machine according to the present disclosure. Through the thermal welding method, the upper frame 230 and the lower frame 220 can be coupled.

[0105] The thermal welding method according to the present disclosure can be applied to the manufacturing of a battery pack. The battery pack can include a plurality of battery modules 200, a reinforcement part 250, and a busbar 240.

[0106] The busbar 240 can be a configuration that electrically connects the plurality of battery cells 210 or the plurality of battery modules 200. For example, the busbar 240 can be electrically connected with the negative terminal 211 of a battery cell and the positive terminal 212 of an adjacent battery cell. The reinforcement part 250 can be a frame located between the plurality of battery modules 200. The reinforcement part 250 can provide additional fixing force to the plurality of battery modules 200 or the busbar 240. For example, the reinforcement part 250 can include a boss or rib 11, and the busbar 240 can include an insertion hole 21 into which the boss or rib 11 is inserted. At this time, the reinforcement part 250 can be the part 10, and the busbar 240 can be the base material 20. After the boss or rib 11 of the reinforcement part 250 is inserted into the insertion hole 21 of the busbar 240, thermal welding can be performed using the welding tip 100 or the thermal welding machine according to the present disclosure. Through the thermal welding method, the busbar 240 can be coupled to the reinforcement part 250.

[0107] The above examples are only a part of examples in which the thermal welding method is applied. Therefore, the thermal welding method according to the present disclosure can also be applied to other configurations of the battery module 200 or the battery pack.

[0108] The embodiments of the present disclosure are described in detail above, but the scope of the right of the present disclosure is not limited thereto, and it is obvious to those skilled in the art that various modifications and changes can be made within the scope of the technical idea of the present disclosure recited in the claims.

Claims

1. A fusion tip which is a fusion tip of a hot fusion machine that thermally fuses a boss or a rib after assembling a component including the boss or the rib and a base material to fix the component and the base material, characterized by, The welding tip includes: a base tip including a needle hole formed vertically at the center thereof, and including a tip head which is in contact with the boss or rib when heat welding is performed; and a welding needle located in the needle hole and configured to be separated from the base tip and to move up and down.

2. The welding tip according to claim 1, wherein: the welding needle includes a main body portion and an auxiliary needle, the auxiliary needle has a smaller cross-sectional area than the main body portion, and the auxiliary needle is disposed toward the boss or rib.

3. The welding tip according to claim 2, wherein: the auxiliary needle includes a first auxiliary needle having a smaller cross-sectional area than the main body portion, and a second auxiliary needle having a smaller cross-sectional area than the first auxiliary needle, the first auxiliary needle and the second auxiliary needle are disposed toward the boss or rib.

4. The welding tip according to claim 2 or 3, wherein: the auxiliary needle is protruded toward the boss or rib and fixed.

5. The welding tip according to claim 2 or 3, wherein: the auxiliary needle is configured to be embedded in the main body portion, and to be protruded toward the boss or rib when heat welding is performed.

6. The welding tip according to any one of claims 1 to 3, wherein: the welding needle includes a needle head which is in contact with the boss or rib, the needle head includes a sunk portion which is recessed toward the inside of the welding needle.

7. The welding tip according to any one of claims 1 to 3, wherein: the welding needle includes a needle head which is in contact with the boss or rib, the needle head further includes a coating layer on a face thereof which is in contact with the boss or rib.

8. The fusion tip of any one of claims 1 to 3, wherein, further including: an elastic body connected with the welding needle, the elastic body is configured to be compressed to accommodate the welding needle in the needle hole when heat welding is performed.

9. A hot melt bonder that, after assembling a component including a boss or rib and a substrate, hot melts the boss or rib to secure the component and the substrate, characterized by, The heat welding machine includes: a welding tip; and a moving member, the welding tip includes: a base tip including a needle hole formed vertically at the center thereof, and including a tip head which is in contact with the boss or rib when heat welding is performed; and a welding needle located in the needle hole and configured to be separated from the base tip and to move up and down, the moving member is configured to be connected with the welding needle and to move the welding needle up and down.

10. The heat welding machine according to claim 9, wherein: the moving member includes a motor and a drive shaft connected with the welding needle, the motor moves the welding needle up and down by rotating the drive shaft.

11. The heat welding machine according to claim 9, wherein: the moving member includes an actuator connected with the welding needle, the actuator moves the welding needle up and down by moving a piston.

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