Resistance welding jig for columnar battery

Abstract

The utility model discloses an electric resistance welding jig for a columnar battery, the electric resistance welding jig is used for conducting electric resistance welding on a to-be-welded position located at the bottom of the columnar battery, the to-be-welded position corresponds to a roll core through hole of the columnar battery, and the electric resistance welding jig comprises a welding needle, a fastener, a guide sleeve and a self-adaptive elastic piece; the welding needle is used for penetrating through the roll core through hole to perform resistance welding on the to-be-welded part; the fastener is sleeved and fixed on the welding pin; the guide sleeve is used for allowing the welding pin to penetrate through so as to guide the welding pin, the guide sleeve is arranged below the fastener, the lower end of the guide sleeve protrudes outwards to form an outer protruding part, and the outer protruding part is configured to be horizontally attached to the top end of the columnar battery; the self-adaptive elastic piece is configured to be arranged between the fastening piece and the outer convex part; when the resistance welding jig is assembled on the columnar battery, the self-adaptive elastic piece is in a first compression state and enables the welding pin to be suspended, and the welding pin is in a vertical state through horizontal positioning of the outer protruding part and guiding of the guide sleeve. The technical problem that the welding needle is not vertical during resistance welding can be solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of cylindrical battery, and particularly to a resistance welding jig for cylindrical battery. BACKGROUND

[0002] At present, lithium ion / sodium ion cylindrical battery gradually becomes the mainstream product in new energy industry due to high energy density, good capacity consistency, and advantages such as supporting large rate charging and discharging. More and more manufacturers continue to pursue high stability and high productivity of cylindrical battery performance. However, there are currently the following common problems:

[0003] In order to improve the productivity, the shell bottom (and the current collector plate) resistance welding structure is generally preferred for cylindrical power battery. However, the welding pin is generally not perpendicular to the shell bottom (the automatic line generally inserts the pin first, and then welds one by one), only the round head structure welding pin can be selected, the welding area is small, and the welding position is directly impacted by the internal large core jumping during the vehicle vibration, which is easy to fall off, resulting in open circuit failure risk of the battery. In addition, the round head structure welding pin has a small welding area, which cannot meet the use demand of large rate charging and discharging of the power battery, or the battery has a large temperature rise (caused by small resistance welding area), which brings safety risk to the battery. CONTENT OF THE INVENTION

[0004] The purpose of the present application is to provide a resistance welding jig for cylindrical battery, which can solve the technical problem that the welding pin is not perpendicular during resistance welding.

[0005] In order to achieve the above purpose, the present application provides a resistance welding jig for cylindrical battery, which is used for resistance welding at a to-be-welded position located at the bottom of the cylindrical battery, the to-be-welded position corresponds to a core through hole of the cylindrical battery, and the resistance welding jig comprises:

[0006] a welding pin, which is used for resistance welding at the to-be-welded position by penetrating through the core through hole;

[0007] a fastener, which is sleeved and fixed on the welding pin;

[0008] a guide sleeve, which is used for guiding the welding pin by penetrating through the guide sleeve, the guide sleeve is arranged below the fastener, the lower end of the guide sleeve protrudes outward to form an outward protruding portion, and the outward protruding portion is configured to be horizontally attached to the top end of the cylindrical battery;

[0009] an adaptive elastic member, which is configured to be arranged between the fastener and the outward protruding portion;

[0010] When the resistance welding jig is assembled on the cylindrical battery, the adaptive elastic member is in a first compressed state and makes the welding pin suspended, and the horizontal positioning of the outward protruding portion and the guiding of the guide sleeve make the welding pin in a perpendicular state.

[0011] Optionally, the head of the soldering pin forms a soldering plane for making plane contact with the soldering position.

[0012] Optionally, the fastener comprises a base plate part, the base plate part is formed with a fastener through hole for the soldering pin to pass through, and the base plate part extends upward at the edge of the fastener through hole to form at least two fastening protrusions, and screw holes are arranged on the fastening protrusions, and screws are fixedly connected to the soldering pin after passing through the screw holes.

[0013] Optionally, the fastener comprises a base plate part, the base plate part is formed with a fastener through hole for the soldering pin to pass through, and at least two limiting holes are formed on the base plate part and distributed along the edge of the fastener through hole; the upper end of the guide sleeve extends upward to form at least two limiting protrusions, and each limiting protrusion is inserted into the corresponding limiting hole.

[0014] Optionally, the base plate part extends upward at the edge of the fastener through hole to form at least two fastening protrusions for screw fixation, and the fastening protrusions and the limiting holes are alternately arranged along the edge of the fastener through hole.

[0015] Optionally, the outer protrusion is in the shape of a ring plate.

[0016] Optionally, the upper end of the self-adaptive elastic member is fixedly connected to the fastener, and the lower end of the self-adaptive elastic member is fixedly connected to the guide sleeve.

[0017] Optionally, the self-adaptive elastic member is sleeved outside the guide sleeve.

[0018] Optionally, the self-adaptive elastic member is a spring.

[0019] The embodiment of the present application utilizes the resistance welding jig to perform resistance welding on the soldering position of the cylindrical battery. When the resistance welding jig is assembled to the cylindrical battery, the soldering pin penetrates into the winding core through hole and is in a free state (suspended) due to the arrangement of the self-adaptive elastic member. The soldering pin is in a vertical state by means of the horizontal positioning of the outer protrusion and the guidance of the guide sleeve. Then the soldering pin can be pressed down, the self-adaptive elastic member is compressed, and the soldering pin vertically descends to contact the soldering position under the guidance of the guide sleeve to perform resistance welding. The present application can ensure that the soldering pin remains in a vertical state during resistance welding. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 is a schematic diagram of the three-dimensional structure of the resistance welding jig for the cylindrical battery according to the embodiment of the present application.

[0021] Figure 2 is an enlarged view of part A in Figure 1

[0022] Figure 3 ​This is a cross-sectional structural schematic diagram of the resistance welding fixture for cylindrical batteries according to an embodiment of this application.

[0023] Figure 4 yes Figure 3 Enlarged view of section B in the middle.

[0024] Figure 5 This is a three-dimensional structural diagram of the welding pin according to an embodiment of this application.

[0025] Figure 6 This is a three-dimensional structural schematic diagram of the welding pin from another perspective of the embodiments of this application.

[0026] Figure 7 This is a three-dimensional structural diagram of the fastener according to an embodiment of this application.

[0027] Figure 8 This is a three-dimensional structural diagram of the guide sleeve according to an embodiment of this application.

[0028] Figure 9 This is a cross-sectional structural diagram of the resistance welding fixture assembled to the cylindrical battery according to an embodiment of this application. Detailed Implementation

[0029] To illustrate the technical content, structural features, and effects of this application in detail, the following description is provided in conjunction with the embodiments and accompanying drawings.

[0030] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0031] Please see Figures 1 to 9 This application discloses a resistance welding fixture for cylindrical batteries, used to perform resistance welding on the part to be welded located at the bottom of the cylindrical battery, the part to be welded corresponding to the core through hole 111 of the cylindrical battery.

[0032] The cylindrical battery assembled with the resistance welding fixture in this embodiment is an incomplete cylindrical battery assembly, allowing the welding needle 50 to pass through the core through hole 111. Specifically, the cylindrical battery at this time includes a core 10, a housing 20 sleeved on the outside of the core 10, a current collector 30 disposed between the core 10 and the bottom wall 21 of the housing 20, and a current collector 40 disposed at the top of the core 10. The top opening of the housing 20 has not yet been fitted with a cover, and the area to be welded refers to the position where the current collector 30 and the bottom wall 21 of the housing 20 need to be welded.

[0033] The resistance welding jig comprises a welding pin 50, a fastener 60, a guide sleeve 70 and an adaptive elastic member 80.

[0034] The welding pin 50 is used to perform resistance welding on the to-be-welded part through the core through hole 111.

[0035] It should be noted that the welding pin 50 passes through the core through hole 111, which is not limited to being completely passed through. For example, the current collecting disc 30 can be formed with a protrusion protruding upward to the bottom of the core through hole 111, and at this time the welding pin 50 does not completely pass through the core through hole 111.

[0036] The fastener 60 is sleeved and fixed on the welding pin 50.

[0037] The guide sleeve 70 is used for the welding pin 50 to pass through to guide the welding pin 50. The guide sleeve 70 is arranged below the fastener 60, and the lower end of the guide sleeve 70 protrudes outward to form an outer protrusion 71. The outer protrusion 71 is configured to be horizontally attached to the top end of the cylindrical battery. In a specific example, the top end of the cylindrical battery refers to the current collecting disc 40 at the top end of the core 10, and the outer protrusion 71 is attached to the current collecting disc 40 to facilitate horizontal attachment. The "horizontal attachment" here refers to placing the cylindrical battery vertically during resistance welding, and the outer protrusion 71 is horizontally attached to the top end of the cylindrical battery.

[0038] The adaptive elastic member 80 is configured to be arranged between the fastener 60 and the outer protrusion 71.

[0039] When the resistance welding jig is assembled on the cylindrical battery (the outer protrusion 71 has been horizontally attached to the top end of the cylindrical battery, and the welding pin 50 has entered the core through hole 111), the adaptive elastic member 80 is in a first compression state (a slight compression state) and makes the welding pin 50 suspended (in a free state spaced from the to-be-welded part). Preferably, at this time, the welding pin 50 has a small spacing from the to-be-welded part. The horizontal positioning of the outer protrusion 71 and the guidance of the guide sleeve 70 make the welding pin 50 in a vertical state.

[0040] After the resistance welding jig is assembled on the cylindrical battery, when the welding pin 50 is pressed, the adaptive elastic member 80 is further compressed, so that the welding pin 50 contacts the to-be-welded part downward (the welding pin is in a second compression state). During the downward process of the welding pin 50, due to the guidance of the guide sleeve 70, the welding pin 50 can be vertically lowered to contact the to-be-welded part.

[0041] The embodiment of the present application utilizes the resistance welding jig to perform resistance welding on the to-be-welded part of the cylindrical battery. When the resistance welding jig is assembled to the cylindrical battery, the welding needle 50 penetrates the core through hole 111 and is in a free state (suspended) due to the setting of the adaptive elastic member 80. The welding needle 50 is in a vertical state by the horizontal positioning of the outer protruding part 71 and the guidance of the guide sleeve 70. Then the welding needle 50 can be pressed down, the adaptive elastic member 80 is compressed, and the welding needle 50 vertically descends under the guidance of the guide sleeve 70 to contact the to-be-welded part to perform resistance welding. The present application can ensure that the welding needle 50 remains in a vertical state during resistance welding.

[0042] Specifically, the head of the welding needle 50 forms a welding plane 51 for planar contact with the to-be-welded part. Since the embodiment of the present application can ensure that the welding needle 50 remains in a vertical state during resistance welding, when the head of the welding needle 50 is formed with the welding plane 51, it can be in planar contact with the to-be-welded part. Compared with the round head structure, a larger welding area can be achieved, which is conducive to solving the technical problems that the welding site is easy to fall off due to a small welding area, cannot meet the use requirements of large-rate charging and discharging of the cylindrical battery, or the temperature of the cylindrical battery rises too high.

[0043] Specifically, the tail of the welding needle 50 forms a tail plane 52.

[0044] In some embodiments, the fastener 60 includes a substrate part 61, the substrate part 61 is formed with a fastener through hole 62 for the welding needle 50 to penetrate, and the substrate part 61 upwardly extends at least two fastening protrusions 63 at the edge of the fastener through hole 62, and the fastening protrusions 63 are provided with screw holes 64. After the screw penetrates the screw hole 64, it is fixedly connected to the welding needle 50. The setting of the substrate part 61 facilitates the setting of the adaptive elastic member 80, and the setting of the fastening protrusions 63 facilitates the fixation of the fastener 60 to the welding needle 50 by the screw.

[0045] In a specific example, the number of fastening protrusions 63 is three, which are uniformly distributed in the circumferential direction. Of course, it is not limited to this.

[0046] In some embodiments, the fastener 60 includes a substrate part 61, the substrate part 61 is formed with a fastener through hole 62 for the welding needle 50 to penetrate, and the substrate part 61 is formed with at least two limiting holes 65 distributed along the edge of the fastener through hole 62; the upper end of the guide sleeve 70 upwardly extends at least two limiting protrusions 72, and each limiting protrusion 72 is respectively inserted into the corresponding limiting hole 65. By forming at least two limiting holes 65 on the substrate part 61 of the fastener 60, the guide sleeve 70 upwardly extends at least two limiting protrusions 72, and at least two limiting protrusions 72 are respectively inserted into at least two limiting holes 65, which can prevent the circumferential displacement of the guide sleeve 70 relative to the fastener 60, and thus can prevent the deviation of the adaptive elastic member 80.

[0047] Specifically, the number of the limiting holes 65 is three, which are evenly distributed in the circumferential direction, and the number of the limiting protrusions 72 is also three, which are evenly distributed in the circumferential direction. Of course, it is not limited to this.

[0048] Specifically, the substrate portion 61 extends upward at the edge of the fastener through hole 62 by at least two fastening protrusions 63 for screw fixation, and the fastening protrusions 63 and the limiting holes 65 are alternately arranged along the edge of the fastener through hole 62, that is, arranged in the circumferential direction in the manner of fastening protrusion 63, limiting hole 65, fastening protrusion 63, limiting hole 65, and so on.

[0049] In a specific example, the number of the limiting holes 65 and the fastening protrusions 63 is three.

[0050] In some embodiments, the outer protrusion 71 is annular plate-shaped. Since the outer protrusion 71 is annular plate-shaped, it is beneficial to stably horizontally fit on the top end of the core 10, thereby facilitating the accurate vertical guidance of the guide sleeve 70. Of course, the outer protrusion 71 is not limited to this, for example, the outer protrusion 71 can also include multiple and be evenly distributed in the circumferential direction.

[0051] Preferably, the bottom of the outer protrusion 71 has a horizontal surface to facilitate horizontal fitting.

[0052] In some embodiments, the upper end of the self-adaptive elastic member 80 is fixedly connected with the fastener 60, and the lower end of the self-adaptive elastic member 80 is fixedly connected with the guide sleeve 70. That is, the resistance welding jig is assembled into a reliable whole before use. When the resistance welding jig is used for resistance welding, the resistance welding jig can be assembled as a whole on the columnar battery, wherein the welding needle 50 first penetrates into the core through hole 111, and then the outer protrusion 71 of the guide sleeve 70 is horizontally fitted on the top end of the columnar battery. Of course, the present application is not limited to the resistance welding jig being assembled into a whole before use.

[0053] Specifically, the self-adaptive elastic member 80 is sleeved outside the guide sleeve 70.

[0054] In a specific example, the upper end and the lower end of the self-adaptive elastic member 80 are fixedly connected to the substrate portion 61 of the fastener 60 and the outer protrusion 71 of the guide sleeve 70, respectively.

[0055] Specifically, the self-adaptive elastic member 80 is a spring.

[0056] In order to facilitate the understanding of the present application, the specific use process will be briefly described below taking the example of the example shown in the drawings of the present application. It should not be regarded as a limitation of the present application.

[0057] First, the two ends of the self-adaptive elastic member 80 are fixedly connected with the fastener 60 and the guide sleeve 70, respectively.

[0058] Next, the welding needle 50 is inserted through the fastener through hole 62, the adaptive elastic member 80 and the guide sleeve 70.

[0059] Next, the fastener 60 is fixed on the welding needle 50.

[0060] Next, the tail of the welding needle 50 is inserted into the core through hole 111.

[0061] Next, the outer convex part 71 is horizontally attached on the current collector plate 30, at this time, the adaptive elastic member 80 is slightly compressed, the head of the welding needle 50 has a small interval with the current collector plate 30, so that the welding needle 50 is in a suspended state, under the action of the guide sleeve 70, the welding needle 50 is in a vertical state.

[0062] Next, the welding equipment presses down the tail of the welding needle 50, compresses the adaptive elastic member 80, and the welding needle 50 is accurately guided by the guide sleeve 70 and vertically descends to contact the current collector plate 30.

[0063] Next, the current collector plate 30 and the bottom wall 21 of the shell 20 are resistance welded.

[0064] After the welding is completed, the tail of the welding needle 50 is taken out, and the adaptive elastic member 80 is adaptively restored.

[0065] The above only discloses the preferred examples of the present application, which is convenient for those skilled in the art to understand and implement, of course, cannot limit the scope of the present application, therefore, the equivalent changes made according to the patent scope of the present application still belong to the scope covered by the present application.

Claims

1. A resistance welding jig for a cylindrical battery for resistance welding a welding target portion located at a bottom of the cylindrical battery, the welding target portion corresponding to a core through-hole of the cylindrical battery, characterized by, The resistance welding jig comprises: a welding pin for resistance welding the to-be-welded part through the winding core through hole; a fastener sleeved and fixed on the welding pin; a guide sleeve for guiding the welding pin, the guide sleeve being arranged below the fastener, the lower end of the guide sleeve outwardly protruding an outward protruding part configured to horizontally fit the top end of the cylindrical battery; an adaptive elastic member configured to be arranged between the fastener and the outward protruding part; when the resistance welding jig is assembled on the cylindrical battery, the adaptive elastic member is in a first compressed state and makes the welding pin suspended, the horizontal positioning of the outward protruding part and the guiding of the guide sleeve make the welding pin in a vertical state.

2. The resistance welding jig for a prismatic battery according to claim 1, characterized by, The head of the welding pin forms a welding plane for planar contact with the to-be-welded part.

3. The resistance welding jig for a prismatic battery according to claim 1, characterized by, The fastener comprises a base plate part formed with a fastener through hole through which the welding pin passes, the base plate part upwardly protruding at least two fastening protruding parts at the edge of the fastener through hole, the fastening protruding parts being provided with screw holes, and a screw being fixedly connected to the welding pin after passing through the screw holes.

4. The resistance welding tool for a prismatic battery according to claim 1, wherein The fastener comprises a base plate part formed with a fastener through hole through which the welding pin passes, the base plate part being formed with at least two limiting holes distributed along the edge of the fastener through hole; the upper end of the guide sleeve upwardly protrudes at least two limiting protruding parts, and each limiting protruding part is respectively inserted into the corresponding limiting hole.

5. The resistance welding jig for a prismatic battery according to claim 4, characterized by, The base plate part upwardly protrudes at least two fastening protruding parts for screw fixation at the edge of the fastener through hole, and the fastening protruding parts and the limiting holes are alternately arranged along the edge of the fastener through hole.

6. The resistance welding tool for a prismatic battery according to claim 1, wherein The outward protruding part is in the shape of a ring plate.

7. The resistance welding tool for a prismatic battery according to claim 1, wherein The upper end of the adaptive elastic member is fixedly connected to the fastener, and the lower end of the adaptive elastic member is fixedly connected to the guide sleeve.

8. The resistance welding jig for a prismatic battery according to claim 1 or 7, characterized by, The adaptive elastic member is sleeved outside the guide sleeve.

9. The resistance welding tool for a prismatic battery according to claim 8, wherein The adaptive elastic member is a spring.

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