Press fitting jig and auxiliary welding equipment

Abstract

The embodiment of the utility model provides a press fitting jig and auxiliary welding equipment, and relates to the technical field of batteries. The utility model provides a press fitting jig which comprises a body and a pressing head. In the welding process of the press-fitting jig, the pressing head is arranged, so that the tab is pressed on the post terminal by the pressing head; and by arranging the second welding opening, laser can be used for performing laser welding on the tab and the pole through the second welding opening. According to the press-fitting jig, the press-fitting jig is optimized, the pressing head of the press-fitting jig can not only press the pole lug and the pole, but also form a saturated welding wire molten pool on the pole lug, the problems of poor welding such as insufficient welding and perforation are solved, and the welding yield is improved by at least 1% compared with that of an existing press-fitting jig.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, and more specifically, to a press-fitting fixture and auxiliary welding equipment. Background Technology

[0002] The tabs inside a battery containing the cell are typically small in area, thin in thickness, and prone to breakage. Therefore, in existing lithium batteries, the positive and negative tabs are generally connected to the terminals via adapter plates. That is, the positive and negative tabs are first ultrasonically welded to the terminals via the adapter plates, and then laser-welded to the terminals via the adapter plates.

[0003] In addition, a common connection method between the positive and negative electrode tabs and the terminal post of lithium batteries is that the tabs are directly connected to the terminal post. That is, the positive and negative electrode tabs are first ultrasonically flat-welded, and then laser-welded to the terminal post. However, during the laser welding of the tabs and terminal post, welding defects such as incomplete welds and perforations often occur. Utility Model Content

[0004] The purpose of this utility model is to provide a press-fitting fixture and auxiliary welding equipment, which can form a saturated weld pool on the electrode tab, thereby optimizing welding defects such as incomplete welds and perforations.

[0005] The embodiments of this utility model can be implemented as follows:

[0006] In a first aspect, the present invention provides a press-fitting fixture, comprising: a body, wherein at least one boss is provided at the bottom of the body, a groove is provided in the boss, and at least one first welding opening is provided at the bottom of the boss, wherein the at least one first welding opening communicates with the groove;

[0007] At least one pressure head is disposed at the bottom of the boss, and the pressure head is provided with a second welding opening communicating with the first welding opening. The pressure head is used to press the tab and the post.

[0008] In an optional embodiment, the body is provided with two protrusions, which are spaced apart along the X-axis direction of the body.

[0009] In an optional embodiment, the bottom of the boss is provided with two pressure heads, which extend along the X-axis direction of the body and are spaced apart along the Y-axis direction of the body.

[0010] In an optional embodiment, the pressure head is a rectangular pressure head, and the second welding opening is a rectangular opening, so that the laser passes through the rectangular opening to form a rectangular laser weld mark on the electrode tab;

[0011] A rectangular ultrasonic welding mark is also formed on the electrode tab.

[0012] In an optional embodiment, the length of the ultrasonic weld is L1, the width of the ultrasonic weld is W1, the length of the pressure head is L2, and the width of the pressure head is W2.

[0013] The length of the second welding opening is L3, the width of the second welding opening is W3, the length of the laser weld mark is L4, and the width of the laser weld mark is W4.

[0014] Among them, L1≥L2>L3>L4, W1≥W2>W3>W4.

[0015] Secondly, this utility model provides an auxiliary welding device, including: a welding machine base;

[0016] The press-fit fixture described in any of the foregoing embodiments is disposed on the welding machine base.

[0017] In an optional embodiment, the body of the press fixture is detachably connected to the welding machine.

[0018] In an optional embodiment, the main body is provided with at least two first connection holes, and the top of the main body is provided with a connector, the connector being provided with at least two second connection holes corresponding to the at least two first connection holes;

[0019] At least two fasteners pass through the first connection hole and the second connection hole respectively, so that the body, the connector and the welding machine are detachably connected.

[0020] In an optional embodiment, the connector has an opening relative to the groove.

[0021] In an optional embodiment, the welding machine is further provided with two base slots for placing the core, the two base slots are spaced apart, and a placement slot is provided between the two base slots;

[0022] The press-fit fixture is positioned above the mounting slot.

[0023] The beneficial effects of the press-fitting fixture and auxiliary welding equipment provided in this embodiment of the utility model include:

[0024] As the welding machine moves the press-fit fixture downwards, the press-fit fixture, equipped with a pressure head, presses the tab and electrode post together, ensuring tight contact between the welding area of ​​the tab and the electrode post. Simultaneously, during the welding process, the pressure head presses the tab firmly onto the electrode post; a second welding opening allows the laser to perform laser welding on the tab and electrode post. This optimized design not only presses the tab and electrode post together but also creates a saturated weld pool on the tab, improving welding defects such as incomplete welds and through-holes. The welding yield is improved by at least 1% compared to existing press-fit fixtures. Attached Figure Description

[0025] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0026] Figure 1 This is a schematic diagram of the auxiliary welding equipment provided in this embodiment;

[0027] Figure 2 This is a schematic diagram of the press-fit fixture provided in this embodiment from a first-view perspective;

[0028] Figure 3 This is a schematic diagram of the press-fit fixture provided in this embodiment from a second perspective.

[0029] Figure 4 This is a bottom view of the press-fit fixture provided in this embodiment;

[0030] Figure 5 This is a structural diagram of the battery provided in this embodiment;

[0031] Figure 6 for Figure 5 A partial schematic diagram of A in the middle.

[0032] Icons: 010-Auxiliary welding equipment; 100-Battery; 110-Core; 120-Electrode tab; 130-Top cover; 140-Ultrasonic welding mark; 150-Laser welding mark; 200-Welding machine; 210-Base slot; 220-Installation slot; 300-Connector; 310-Opening; 320-Second connecting hole; 400-Pressure fitting fixture; 410-Body; 411-Boss; 412-Groove; 413-First connecting hole; 420-Pressure head; 421-Second welding opening. Detailed Implementation

[0033] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0034] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0035] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0036] In the description of this utility model, it should be noted that if terms such as "upper," "lower," "inner," or "outer" are used to indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the utility model product is usually placed during use, they are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0037] Furthermore, the terms "first" and "second" are used only to distinguish descriptions and should not be interpreted as indicating or implying relative importance.

[0038] It should be noted that, where there is no conflict, the features in the embodiments of this utility model can be combined with each other.

[0039] The following describes in detail the overall structure, working principle, and technical effects of the press-fitting fixture 400 and auxiliary welding equipment 010 provided by this utility model through embodiments and in conjunction with the accompanying drawings.

[0040] Please refer to Figure 1 The press-fit fixture 400 and auxiliary welding equipment 010 provided by this utility model are used for welding electrode tabs 120 and electrode posts.

[0041] Among them, the auxiliary welding equipment 010 can directly laser weld the tabs 120 of the core 110 to the pole post.

[0042] Please refer to Figure 1The present invention provides an auxiliary welding device 010, which includes a welding machine base 200 and a pressing fixture, wherein the pressing fixture is disposed on the welding machine base 200.

[0043] In this embodiment, the auxiliary welding equipment 010 includes a welding machine 200.

[0044] In this embodiment, the body 410 of the press fixture is detachably connected to the welding machine 200.

[0045] Alternatively, please refer to Figure 1 The main body 410 is provided with at least two first connecting holes 413, and the top of the main body 410 is provided with a connector 300. The connector 300 is provided with a second connecting hole 320 corresponding to the at least two first connecting holes 413. At least two fasteners pass through the first connecting holes 413 and the second connecting holes 320 respectively, so that the main body 410, the connector 300 and the welding machine 200 can be detachably connected.

[0046] The main body 410 is provided with three first connecting holes 413, and the connector 300 is also provided with three second connecting holes 320.

[0047] Fasteners can include threaded nuts, etc.

[0048] The connector 300 has an opening 310 relative to the groove 412. This allows the laser to pass through the opening 310, the groove 412, the first welding opening, and the second welding opening 421 to weld the tab 120 and the electrode post.

[0049] In this embodiment, please refer to Figure 1 The welding machine 200 is also provided with two base slots 210 for placing the core 110. The two base slots 210 are spaced apart, and a placement slot 220 is provided between the two base slots 210. The pressing fixture is set above the placement slot 220.

[0050] The base slot 210 is used to place the core 110, and the mounting slot 220 is used to place the top cover 130; the two base slots 210 are symmetrically distributed on both sides of the mounting slot 220.

[0051] Understandably, please refer to Figure 5The top cover 130 is inverted in the mounting slot 220, and the two cores 110 are placed in the base slot 210 respectively, with the tabs 120 of the two cores 110 facing the mounting slot 220. At the same time, the tabs 120 of the two cores 110 are stacked and laid flat at the pole position of the top cover 130. The welding machine 200 is operated to move the pressing fixture downward to press the tabs 120 that have undergone ultrasonic flat welding, and to perform press welding on the tabs 120 and the pole, so that the welding area of ​​the tabs 120 is in close contact with the pole, and a laser weld mark 150 is formed at the ultrasonic weld mark 140 position of the tabs 120, thereby forming a saturated weld pool and optimizing welding defects such as cold solder joints and through holes.

[0052] In this embodiment, the auxiliary welding equipment 010 includes a press-fit fixture 400.

[0053] Please refer to Figures 2-3 The present invention proposes a press-fitting fixture 400, comprising: a body 410, the bottom of the body 410 having at least one boss 411, the boss 411 having a groove 412 therein, the bottom of the boss 411 having at least one first welding opening, and the at least one first welding opening communicating with the groove 412.

[0054] At least one pressure head 420 is disposed at the bottom of the boss 411, and the pressure head 420 is provided with a second welding opening 421 communicating with the first welding opening.

[0055] Understandably, by setting up a press fixture with a pressure head 420, which is located at the bottom of the boss 411 and has a second welding opening 421, the press fixture moves downward with the welding machine 200. The pressure head 420 presses the tab 120 and the electrode post together, so that the welding area of ​​the tab 120 is in close contact with the electrode post. At the same time, during the welding process of the press fixture, while the pressure head 420 presses the tab 120 onto the electrode post, it can also allow the laser to perform laser welding on the tab 120 and the electrode post through the second welding opening 421, forming a saturated weld pool on the tab 120. This setup optimizes the press fixture 400, improves welding defects such as incomplete welds and perforations, and increases the welding yield by at least 1% compared to the existing press fixture 400.

[0056] In this embodiment, the press-fit fixture 400 includes a body 410.

[0057] The bottom of the body 410 is provided with at least one boss 411, the boss 411 is provided with a groove 412, the bottom of the boss 411 is provided with at least one first welding opening, and the at least one first welding opening communicates with the groove 412.

[0058] The boss 411 has a trapezoidal structure that is larger at the top and smaller at the bottom, while the groove 412 has a trapezoidal groove structure. This design of the boss 411 allows the laser to be emitted completely from within the groove 412.

[0059] In this embodiment, a press-fit fixture is used to press-fit the tabs 120 and terminals of the square battery 100. Therefore, please refer to... Figures 2-3 Two protrusions 411 are provided on the body 410, and the two protrusions 411 are spaced apart along the X-axis direction of the body 410.

[0060] In this embodiment, the bottom of the boss 411 is provided with two pressure heads 420. The two pressure heads 420 extend along the X-axis direction of the body 410, and are spaced apart along the Y-axis direction of the body 410. It can be understood that this arrangement of two pressure heads 420 can form double solder joints on the tab 120 and the pole post, which can improve the connection reliability and strength between the tab 120 and the pole post, and increase the fault tolerance rate during the welding process.

[0061] It is worth mentioning that during the welding process of the press-fitting fixture, the press-fitting fixture can perform laser welding on the tab 120. After the laser passes through the opening 310, the groove 412, the first welding opening and the second welding opening 421, the laser locally heats the tab 120 and the pole, so that the material of the tab 120 and the pole in close contact melts and joins together, and at the same time, a laser weld mark 150 is formed on the tab 120.

[0062] In this embodiment, please refer to Figure 4 and Figure 6 The pressure head 420 is a rectangular pressure head 420, and the second welding opening 421 is a rectangular opening 310, so that the laser passes through the rectangular opening 310 to form a rectangular laser welding mark 150 on the electrode 120.

[0063] The electrode tab is also formed with a rectangular ultrasonic weld mark; before welding with the press fixture, ultrasonic waves are used to ultrasonically weld the electrode tab 120 and the electrode post, thereby forming a rectangular ultrasonic weld mark 140 on the electrode tab 120.

[0064] Among them, the length of the ultrasonic welding mark 140 is L1, the width of the ultrasonic welding mark 140 is W1, the length of the pressure head 420 is L2, and the width of the pressure head 420 is W2.

[0065] The length of the second welding opening 421 is L3, the width of the second welding opening 421 is W3, the length of the laser welding mark 150 is L4, and the width of the laser welding mark 150 is W4.

[0066] The relationships between the pressure head 420, laser welding mark 150, and laser welding mark 150 are as follows: L1≥L2>L3>L4, W1≥W2>W3>W4.

[0067] The working principle and process of the press-fit fixture 400 and auxiliary welding equipment 010 provided in this embodiment of the utility model are as follows: The top cover 130 is inverted in the mounting slot 220, and the two cores 110 are placed in the base slot 210 respectively, with the tabs 120 of the two cores 110 facing the mounting slot 220; at the same time, the tabs 120 of the two cores 110 are stacked and laid flat at the pole position of the top cover 130, the welding machine 200 is operated, the press-fit fixture is moved downward to press the ultrasonic flat welding tabs 120, and the tabs 120 and the pole are press-fitted and welded, so that the welding area of ​​the tabs 120 is in close contact with the pole; finally, the tabs 120 and the pole are welded by the press-fit fixture.

[0068] In summary, the press-fit fixture 400 and auxiliary welding equipment 010 provided in this embodiment of the present invention, when the welding machine 200 moves the press-fit fixture downwards, enable the press-fit fixture with a press head 420, located at the bottom of the boss 411, to press the tab 120 and the electrode post tightly, ensuring close contact between the welding area of ​​the tab 120 and the electrode post. Simultaneously, during the welding process of the press-fit fixture, the press head 420 presses the tab 120 tightly; and the second welding opening 421 allows the laser to perform laser welding on the tab 120 and the electrode post. This optimized design of the press-fit fixture 400 ensures that the press head 420 not only presses the tab 120 and the electrode post tightly but also forms a saturated weld pool on the tab 120, optimizing welding defects such as incomplete welds and perforations. The welding yield is improved by at least 1% compared to existing press-fit fixtures 400.

[0069] The above are merely specific embodiments of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model.

Claims

1. A press-fitting fixture, characterized in that, include: The body has at least one boss at its bottom, a groove inside the boss, and at least one first welding opening at its bottom, which communicates with the groove. At least one pressure head is disposed at the bottom of the boss, and the pressure head is provided with a second welding opening communicating with the first welding opening. The pressure head is used to press the tab and the post.

2. The press-fit fixture according to claim 1, characterized in that, The body has two protrusions, which are spaced apart along the X-axis of the body.

3. The press-fit fixture according to claim 1, characterized in that, The bottom of the boss is provided with two pressure heads, which extend along the X-axis of the body and are spaced apart along the Y-axis of the body.

4. The press-fit fixture according to claim 1, characterized in that, The pressure head is a rectangular pressure head, and the second welding opening is a rectangular opening, so that the laser passes through the rectangular opening to form a rectangular laser welding mark on the electrode tab; A rectangular ultrasonic welding mark is also formed on the electrode tab.

5. The press-fitting fixture according to claim 4, characterized in that, The length of the ultrasonic weld mark is L1, the width of the ultrasonic weld mark is W1, the length of the pressure head is L2, and the width of the pressure head is W2. The length of the second welding opening is L3, the width of the second welding opening is W3, the length of the laser weld mark is L4, and the width of the laser weld mark is W4. Among them, L1≥L2>L3>L4, W1≥W2>W3>W4.

6. An auxiliary welding device, characterized in that, include: Welding machine; The press-fit fixture according to any one of claims 1-5, wherein the press-fit fixture is disposed on the welding machine platform.

7. The auxiliary welding equipment according to claim 6, characterized in that, The body of the press fixture is detachably connected to the welding machine.

8. The auxiliary welding equipment according to claim 7, characterized in that, The main body is provided with at least two first connection holes, and the top of the main body is provided with a connector, the connector being provided with at least two second connection holes corresponding to the at least two first connection holes; At least two fasteners pass through the first connection hole and the second connection hole respectively, so that the body, the connector and the welding machine are detachably connected.

9. The auxiliary welding equipment according to claim 8, characterized in that, The connector has an opening opposite the groove.

10. The auxiliary welding equipment according to claim 7, characterized in that, The welding machine is also provided with two base slots for placing the core, the two base slots are spaced apart, and a placement slot is provided between the two base slots; The press-fit fixture is positioned above the mounting slot.

Images