Battery pre-fixing tool and battery welding method

Abstract

The invention relates to the technical field of welding equipment, in particular to a battery pre-fixing tool and a battery welding method. The battery pre-fixing tool comprises a supporting platform and a pressing block, wherein the supporting platform is used for bearing a protection plate, a nickel sheet connected with the protection plate and a tab; the pressing block abuts against the supporting platform and is used for pressing the protection plate, the nickel sheet and the tab; a through hole is formed in the pressing block and is used for a glue head of a glue dispenser to pass through so as to dispense glue on the end part of the nickel sheet, so that the nickel sheet is adhered to the tab. The battery pre-fixing tool can pre-fix the nickel sheet and the tab before welding, so that the gap between the nickel sheet and the tab is reduced, and the welding stability and quality are improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of welding equipment, in particular to a battery pre-fixing tool and a battery welding method. BACKGROUND

[0002] With the wide application of lithium battery technology, the performance optimization and space utilization of the lithium battery protection plate as the core component of the battery management system have become the focus of the industry. The traditional lithium battery protection plate generally uses nickel sheets as the key connecting components for connecting the battery tabs, and these nickel sheets need to be fixed to the tabs through a welding process.

[0003] However, the prior art has the problems of unstable welding and poor welding quality. SUMMARY

[0004] The purpose of the present application includes providing a battery pre-fixing tool and a battery welding method, which can pre-fix the nickel sheet and the tab before welding to improve the welding stability and quality.

[0005] Embodiments of the present application can be implemented as follows: In a first aspect, the present application provides a battery pre-fixing tool, comprising: a support platform, the support platform being used to carry a protection plate, a nickel sheet connected to the protection plate, and a tab; a pressing block, the pressing block being in abutment with the support platform, the pressing block being used to hold the protection plate, the nickel sheet, and the tab; the pressing block is provided with a through hole, the through hole being used to pass a glue head of a glue dispenser to glue the end of the nickel sheet, so that the nickel sheet and the tab are adhered.

[0006] In an optional embodiment, the support platform is provided with a carrying protrusion; the carrying protrusion is in abutment with the bottom of the pressing block; the carrying protrusion is used to contact the nickel sheet and the tab.

[0007] In an optional embodiment, the height of the carrying protrusion is less than the thickness of the protection plate.

[0008] In an optional embodiment, the support platform is provided with a positioning protrusion, the positioning protrusion is in abutment with the side wall of the pressing block; the positioning protrusion is used to abut the side wall of the protection plate.

[0009] In an optional embodiment, the positioning protrusion comprises two positioning segments connected to each other, the two positioning segments are in abutment with the two side walls adjacent to the pressing block respectively; the two positioning segments are used to abut the two side walls adjacent to the protection plate respectively.

[0010] In an optional embodiment, the support platform is further provided with a clamping protrusion, the pressing block is provided with a clamping groove, the clamping protrusion is connected and matched with the clamping groove.

[0011] In an optional embodiment, the inner wall of the through hole is provided with a guide slope for guiding the glue to move to the end of the nickel sheet.

[0012] In an optional embodiment, the edge of the through hole extends away from the support platform to form a positioning boss. The positioning boss is used to contact the glue dispenser.

[0013] In a second aspect, the present application provides a battery welding method based on the aforementioned battery pre-fixing tool, comprising: connecting the protection plate and the nickel sheet; placing the protection plate and the tab on the support platform in sequence, so that the end of the tab is attached to the middle part of the nickel sheet; the pressing block is in abutment with the support platform, and the pressing block holds the protection plate, the nickel sheet and the tab; the glue head is inserted into the through hole to glue the nickel sheet, so that the glue is attached to the end of the nickel sheet, thereby causing the nickel sheet and the tab to be adhered; separating the pressing block from the protection plate, the nickel sheet and the tab; using a laser welder to weld the adhered nickel sheet and tab.

[0014] In an optional embodiment, the step of connecting the protection plate and the nickel sheet comprises: placing a part of the nickel sheet in the accommodation groove of the protection plate; connecting the nickel sheet with the inner wall of the accommodation groove.

[0015] In an optional embodiment, the step of placing the protection plate and the tab on the support platform in sequence, so that the end of the tab is attached to the middle part of the nickel sheet, comprises: abutting the protection plate with the positioning boss, and causing the middle part of the nickel sheet to contact the carrying boss; placing the tab on the carrying boss, so that the end of the tab contacts the middle part of the nickel sheet in contact with the carrying boss.

[0016] The battery pre-fixing tool and the battery welding method provided by the embodiments of the present application have the following beneficial effects: The protection plate, the nickel sheet and the tab are pressed on the support platform by the pressing block, so that the gap between the nickel sheet and the tab is reduced to less than 0.1 mm. The pressing block is provided with a through hole, and the through hole is opposite to the end of the nickel sheet, so that the glue head of the glue dispenser can extend into the through hole to glue the end of the nickel sheet, so that the glue flows from the end of the nickel sheet to the middle of the nickel sheet, and then flows into the gap between the nickel sheet and the tab, thereby making the nickel sheet and the tab adhere together to realize pre-fixing. After the nickel sheet and the tab are pre-fixed, the nickel sheet and the tab are welded. Since the gap between the nickel sheet and the tab is less than 0.1 mm, the stability and quality of the welding can be improved, and the problem of poor welding quality caused by too large gap can be avoided. BRIEF DESCRIPTION OF DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments. It should be understood that the following drawings only show some embodiments of the present application, and therefore should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can also be obtained without creative labor.

[0018] Figure 1 A structural schematic diagram of the battery pre-fixing tool provided by the present embodiment is shown in the figure. Figure 2 A exploded schematic diagram of the battery pre-fixing tool, the protection plate, the nickel sheet and the tab provided by the present embodiment is shown in the figure. Figure 3 A structural schematic diagram of the battery pre-fixing tool provided by the present embodiment is shown in the figure. Figure 2 A local enlarged view of A in the figure. Figure 4 A local exploded schematic diagram of the protection plate and the nickel sheet is shown in the figure. Figure 5 A local schematic diagram of the protection plate, the nickel sheet and the tab is shown in the figure. Figure 6 A structural schematic diagram of the support platform provided by the present embodiment is shown in the figure. Figure 7 A structural schematic diagram of the pressing block from the first perspective provided by the present embodiment is shown in the figure. Figure 8 A structural schematic diagram of the pressing block from the second perspective provided by the present embodiment is shown in the figure. Figure 9 A flowchart of the battery welding method provided by the present embodiment is shown in the figure. Figure 10 A flowchart of the installation of the protection plate and the nickel sheet in the battery welding method provided by the present embodiment is shown in the figure. Figure 11 A flowchart of the placement of the protection plate, the nickel sheet and the tab in the battery welding method provided by the present embodiment is shown in the figure.

[0019] Icon: 100 - battery pre-fixing tool; 110 - support platform; 111 - bearing protrusion; 112 - positioning protrusion; 1121 - positioning section; 113 - clamping protrusion; 120 - pressing block; 121 - through hole; 122 - guide slope; 123 - clamping groove; 124 - positioning boss; 200 - protection plate; 210 - accommodating groove; 300 - nickel sheet; 310 - first connecting part; 320 - second connecting part; 330 - transition part; 400 - tab. DETAILED DESCRIPTION

[0020] In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application described and shown in the drawings can be arranged and designed in various different configurations.

[0021] Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the claimed present application, but only represents selected embodiments of the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present application without creative labor are within the scope of protection of the present application.

[0022] It should be noted that: similar reference numerals and letters represent similar items in the following drawings, therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0023] In the description of the present application, it should be noted that if the terms "upper", "lower", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, or the orientation or positional relationship commonly placed when the product of the present application is used, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the indicated tool or element must have a particular orientation, be constructed and operated in a particular orientation, therefore, it cannot be understood as a limitation on the present application.

[0024] In addition, if the terms "first", "second" and the like appear, they are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0025] It should be noted that the features in the embodiments of the present application can be combined with each other without conflict.

[0026] As the core safety component of lithium battery pack, the design quality of lithium battery protection plate is directly related to the comprehensive performance and operation reliability of the battery pack. With the continuous evolution of portable electronic devices towards thin and light, the space utilization of lithium battery protection plate has become a key design parameter. In traditional protection plate design, the nickel sheet generally uses surface mounting process. This way not only occupies a large layout space, but also restricts the arrangement density of electronic components. In order to break through this technical bottleneck, the industry is gradually promoting the design scheme of nickel sheet embedded protection plate. This scheme realizes high reliability connection with the battery tab through laser welding process.

[0027] The current laser welding process mainly adopts pressure clamp welding process, magnetic attraction welding process and intermediate filler welding (such as copper paste and silver paste solidification process).

[0028] However, the pressure clamp welding process has applicability limitations. This process requires that the thickness of the welding area must be greater than the minimum diameter of the laser welding point (the standard value is 0.6mm). The welding area thickness caused by the nickel sheet embedded design is only 0.5mm, which cannot meet the process specification requirements.

[0029] The magnetic attraction welding process has double constraints. It is limited by the heterogeneity of the battery tab material (nickel tab and aluminum tab coexist), and is restricted by the narrow welding space (width 6mm, welding length 2.5mm), which leads to problems such as aluminum tab welding failure and nickel tab deformation and warping, making it difficult to achieve the assembly gap precision requirement within 0.1mm.

[0030] Although the intermediate filler welding has theoretical feasibility, its process condition requirement (high temperature of 170℃ for 80 seconds) far exceeds the temperature threshold of 55℃ of lithium battery electrolyte, which will inevitably cause permanent damage to the performance of the battery cell.

[0031] In the embodiment, the nickel sheet 300 of the battery includes a first connecting part 310 and a second connecting part 320 connected to each other, the protection plate 200 is provided with a containing groove 210, the first connecting part 310 of the nickel sheet 300 is located in the containing groove 210, the first connecting part 310 is connected with the inner wall of the containing groove 210, and the second connecting part 320 is located outside the containing groove 210, and the second connecting part 320 is used for welding with the tab 400.

[0032] Since the protection plate 200 is provided with the containing groove 210, part of the nickel sheet 300 can be located in the containing groove 210, so that the part of the nickel sheet 300 protruding relative to the protection plate 200 is narrowed, and the internal space layout of the battery is more compact, and the space occupancy is improved.

[0033] Since the gap between the nickel sheet 300 and the tab 400 needs to be less than 0.1mm when welding the nickel sheet 300 and the tab 400, however, the nickel sheet 300 in the embodiment has a small volume, and if a traditional welding process, such as a jaw pressing welding process, is used, the jaw is difficult to accurately position to press the nickel sheet 300 and the tab 400, so that the tab 400 and the nickel sheet 300 cannot be pressed tightly, resulting in a gap between the tab 400 and the nickel sheet 300 being too large, thereby causing unstable welding and affecting the welding effect and quality.

[0034] Based on the above problems, the embodiment of the present application provides a battery welding method, which pre-fixes the tab 400 and the nickel sheet 300 before welding, so that the gap between the tab 400 and the nickel sheet 300 is less than 0.1mm, thereby improving the stability and quality of welding.

[0035] Based on the battery welding method, please refer to Figures 1-5 , the embodiment of the present application provides a battery pre-fixing tool 100 to pre-fix the tab 400 and the nickel sheet 300 before welding, and then perform welding after pre-fixing, thereby improving the welding effect and welding quality.

[0036] The battery pre-fixing tool 100 includes a support platform 110 and a pressing block 120, and the battery includes a protection plate 200, a nickel sheet 300 and a tab 400; the protection plate 200, the nickel sheet 300 and the tab 400 are placed on the support platform 110, and the pressing block 120 is also placed on the support platform 110, so that the protection plate 200, the nickel sheet 300 and the tab 400 are located between the support platform 110 and the pressing block 120; specifically, the pressing block 120, the tab 400, the nickel sheet 300 and the support platform 110 are arranged in sequence in the vertical direction. In the embodiment, the pressing block 120 can press the protection plate 200, the nickel sheet 300 and the tab 400 by applying force to the pressing block 120, and then the pressing block 120 and the support platform 110 interact, thereby reducing the gap between the nickel sheet 300 and the tab 400, so that the gap between the nickel sheet 300 and the tab 400 can be less than 0.1mm.

[0037] Specifically, as Figure 5 shown, the gap between the nickel sheet 300 and the tab 400 in the pressed state is L, and L<0.1mm.

[0038] It should be noted that before pre-fixing, the nickel sheet 300 is already connected to the receiving groove 210 of the protection plate 200, while the nickel sheet 300 and the tab 400 are only in contact and not connected together; therefore, the objects to be welded are the nickel sheet 300 and the tab 400, and the battery pre-fixing fixture 100 needs to pre-fix the nickel sheet 300 and the tab 400. In order to prevent the protection plate 200 from shifting and causing the nickel sheet 300 to move, the pressure block 120 and the support platform 110 act not only on the nickel sheet 300 and the tab 400, but also on the protection plate 200, so as to simultaneously hold the protection plate 200, the nickel sheet 300 and the tab 400.

[0039] The nickel sheet 300 also includes two transition portions 330, which are respectively connected to both ends of the second connecting portion 320. One end of the tab 400 contacts the second connecting portion 320 of the nickel sheet 300, that is, the end of the tab 400 contacts the middle of the nickel sheet 300, so that the end of the nickel sheet 300 protrudes relative to the tab 400. The transition portion 330 is connected to the edge of the groove of the receiving groove 210, which prevents glue from flowing out from the gap between the transition portion 330 and the protection plate 200, and can reduce the volume of the nickel sheet 300, making the internal structure of the battery more compact and improving space utilization.

[0040] In this embodiment, the pressure block 120 is further provided with a through hole 121 for the dispensing head of the dispensing machine to pass through, and the through hole 121 is directly opposite the end of the nickel sheet 300, that is, the through hole 121 is directly opposite the transition portion 330 of the nickel sheet 300. Understandably, the dispensing head of the dispensing machine extends into the through hole 121, and after the dispensing machine dispenses the glue, the glue moves along the axial direction of the through hole 121 to the transition portion 330 of the nickel sheet 300, thereby enabling the dispensing machine to dispense glue to the end of the nickel sheet 300.

[0041] After the adhesive adheres to the transition section 330, its fluidity allows it to flow into the gap between the nickel sheet 300 and the tab 400, thus using the adhesive properties to bond the nickel sheet 300 and the tab 400 together, achieving pre-fixation. Finally, after pre-fixation, the pressure block 120 is removed, and the nickel sheet 300 and the tab 400 are welded together using a laser welder.

[0042] It should be noted that, generally speaking, a battery has two tabs 400, one positive and one negative. Therefore, two nickel plates 300 are needed to connect to the two tabs 400 respectively. Thus, the protection board 200 also has two receiving slots 210.

[0043] Correspondingly, the pressure block 120 in this embodiment is provided with four through holes 121. Each pair of through holes 121 corresponds to both ends of a nickel sheet 300. Thus, after the pressure block 120 holds the protective plate 200, the nickel sheet 300 and the tab 400, four dispensing machines can be used to dispense glue to four positions at the same time, improving the efficiency of dispensing and avoiding multiple pressing, which would affect the pre-fixation and welding effect.

[0044] Further, please refer to Figures 1-6 The support platform 110 is provided with a support protrusion 111 for supporting the nickel sheet 300 and the tab 400. Specifically, the protective plate 200 is located on one side of the support protrusion 111, and the support protrusion 111 is directly opposite the receiving groove 210, so that the second connecting portion 320 of the nickel sheet 300 can contact the support protrusion 111. Since the end of the tab 400 contacts the second connecting portion 320 of the nickel sheet 300, and the tab 400 is placed on the support protrusion 111, the second connecting portion 320 of the nickel sheet 300 is located between the tab 400 and the support protrusion 111. In addition, the bottom of the pressure block 120 abuts against the support protrusion 111, so that a downward force can be applied to the pressure block 120 to press the tab 400 and the nickel sheet 300.

[0045] Because the bearing protrusion 111 raises the nickel sheet 300 and the tab 400, other parts of the support platform 110 will not affect the pressing of the pressure block 120 during the pressing process; thereby ensuring that the gap between the tab 400 and the nickel sheet 300 is less than 0.1mm, so as to improve the pre-fixing effect and improve the welding stability and quality.

[0046] Understandably, if a groove is used to position the nickel sheet 300 and the tab 400, during the process of the pressure block 120 pressing the tab 400 and the nickel sheet 300, the pressure block 120 will first abut against other parts of the support platform 110, resulting in poor pressing effect. The gap between the tab 400 and the nickel sheet 300 is greater than 0.1mm, which affects the pre-fixing and welding effect.

[0047] Based on the above, in this embodiment, the height of the supporting protrusion 111 is less than the thickness of the protective plate 200, allowing the nickel sheet 300 to be placed horizontally on the supporting protrusion 111. If the height of the supporting protrusion 111 is too high, the nickel sheet 300 will not be able to be placed where there is a protrusion or will become bent. If the nickel sheet 300 is bent, the gap between the nickel sheet 300 and the tab 400 will become larger, and even with the pressure block 120, it cannot be guaranteed that the gap between the two will be less than 0.1mm, thus affecting the welding effect. Furthermore, because the nickel sheet 300 is bent, the adhesive will flow towards the bent position of the nickel sheet 300, preventing the adhesive from flowing into the bonding area between the nickel sheet 300 and the tab 400, affecting the pre-fixing effect.

[0048] Furthermore, in this embodiment, the support platform 110 is also provided with a positioning protrusion 112. When the protective plate 200 is placed, the protective plate 200 is held together with the positioning protrusion 112 to position the protective plate 200, so that the groove of the receiving groove 210 of the protective plate 200 is aligned with the bearing protrusion 111, thereby allowing the nickel sheet 300 to be placed on the bearing protrusion 111. Subsequently, the pressure block 120 is placed, so that the side wall of the pressure block 120 is held against the positioning protrusion 112 to position the pressure block 120, so that the through hole 121 of the pressure block 120 is aligned with the transition portion 330 of the nickel sheet 300, so that when the glue head is inserted into the through hole 121 for dispensing, glue can be dispensed to the transition portion 330 of the nickel sheet 300, so that the glue can flow smoothly into the gap between the nickel sheet 300 and the tab 400.

[0049] It should be noted that, since the battery has two tabs 400, one positive and one negative, the support platform 110 also has two corresponding bearing platforms.

[0050] Specifically, in this embodiment, the positioning protrusion 112 includes two interconnected positioning segments 1121, which abut against two adjacent side walls of the pressure block 120 respectively; the two positioning segments 1121 are respectively used to abut against two adjacent side walls of the protective plate 200; it can be understood that the positioning protrusion 112 in this embodiment is L-shaped, so that the positioning protrusion 112 in this embodiment can not only position the protective plate 200, but also restrict the movement of the protective plate 200 in the horizontal direction, so as to avoid displacement of the protective plate 200 affecting the pre-fixing effect and the welding effect.

[0051] Further, please refer to Figures 1-8 In this embodiment, the inner wall of the through hole 121 is provided with a guide slope 122. Specifically, along the direction close to the nickel sheet 300, the cross-sectional area of ​​the through hole 121 gradually decreases, thereby guiding the adhesive to move in the direction where the nickel sheet 300 is located. Since the through hole 121 is directly opposite the end of the nickel sheet 300, the guide slope 122 can guide the adhesive to move to the end of the nickel sheet 300.

[0052] The edge of the through hole 121 extends away from the support platform 110 to form a positioning boss 124, which is used for positioning. This allows the dispensing machine to contact the positioning boss 124 first, thus ensuring that the dispensing head of the dispensing machine can smoothly enter the through hole 121. After the pressure block 120 presses the tab 400 and the nickel sheet 300, the dispensing can be performed in time, improving the pre-fixing effect.

[0053] According to the above structural configuration, the support platform 110 is also provided with a snap-fit ​​protrusion 113, and the pressure block 120 is also provided with a snap-fit ​​groove 123. The snap-fit ​​protrusion 113 and the snap-fit ​​groove 123 are connected and engaged. Specifically, the snap-fit ​​protrusion 113 is located between two bearing protrusions 111, while the protective plate 200 is located between the snap-fit ​​protrusion 113 and the positioning protrusion 112. The snap-fit ​​protrusion 113 also abuts against the side wall of the protective plate 200 to further achieve the positioning effect. Furthermore, the snap-fit ​​engagement of the snap-fit ​​protrusion 113 and the snap-fit ​​groove 123 allows the snap-fit ​​protrusion 113 and the positioning protrusion 112 to jointly position the pressure block 120, ensuring that the through hole 121 of the pressure block 120 is aligned with the end of the nickel sheet 300, thereby ensuring that the dispensing machine can dispense adhesive to the end of the nickel sheet 300.

[0054] Please refer to Figure 9 In conjunction with the aforementioned structural configuration of the battery pre-fixing fixture 100, the battery welding method provided in this embodiment of the invention includes the following steps: S1: Connects the protection plate 200 and the nickel plate 300.

[0055] S2: Place the protective plate 200 and the tab 400 on the support platform 110 in sequence, so that the end of the tab 400 is in contact with the middle of the nickel sheet 300.

[0056] S3: The pressure block 120 abuts against the support platform 110, and the pressure block 120 presses down the protective plate 200, the nickel sheet 300 and the tab 400.

[0057] S4: The glue tip is inserted into the through hole 121 to apply glue to the nickel sheet 300, so that the glue adheres to the end of the nickel sheet 300, thereby making the nickel sheet 300 stick to the tab 400.

[0058] S5: Separate the pressure block 120 from the protection plate 200, the nickel sheet 300, and the tab 400.

[0059] S6: Use a laser welder to weld the bonded nickel sheet 300 and tab 400.

[0060] Understandably, since the protective plate 200 and the nickel sheet 300 are connected, when the protective plate 200 is placed on the support platform 110, the nickel sheet 300 is also placed on the support protrusion 111. Specifically, the second connecting portion 320 of the nickel sheet 300 contacts the end of the support protrusion 111 and the tab 400.

[0061] Since the through hole 121 is directly opposite the end of the nickel sheet 300, when the dispensing machine extends into the through hole 121, the end of the dispensing head will be directly opposite the end of the nickel sheet 300, and the adhesive will flow from the dispensing head to the end of the nickel sheet 300. During continuous dispensing, as more and more adhesive accumulates at the end of the nickel sheet 300, some adhesive will flow towards the center of the nickel sheet 300, that is, adhesive will flow from the transition portion 330 of the nickel sheet 300 into the second connecting portion 320, thereby allowing the adhesive to flow into the gap between the nickel sheet 300 and the tab 400. Thus, the nickel sheet 300 and the tab 400 can adhere to each other, thereby achieving pre-fixation.

[0062] After pre-fixing the nickel sheet 300 and the tab 400, the gap between the nickel sheet 300 and the tab 400 can be less than 0.1mm. Then, the nickel sheet 300 and the tab 400 are welded using a laser welder to improve welding stability and quality and avoid poor welding effect caused by excessive gap.

[0063] It should be noted that after the nickel sheet 300 and the tab 400 are welded together, the other components of the battery, such as the cell and the casing, are assembled with the protection board 200, the nickel sheet 300 and the tab 400 to form a complete battery.

[0064] Based on the above, please refer to... Figure 10 In this embodiment, step S1, connecting the protection plate 200 and the nickel sheet 300, further includes the following steps: S11: Place a portion of the nickel sheet 300 into the receiving groove 210 of the protective plate 200.

[0065] S12: Connect the nickel sheet 300 to the inner wall of the receiving groove 210.

[0066] Specifically, the nickel sheet 300 includes a first connecting portion 310 and a second connecting portion 320. Therefore, the first connecting portion 310 needs to be placed on the protective plate 200, and the nickel sheet 300 is installed into the receiving groove 210 using bolts or other fixing structures, so that the first connecting portion 310 and the inner wall of the receiving groove 210 are fixedly connected. It should be noted that when connecting the protective plate 200 and the nickel sheet 300, the transition portions 330 at both ends of the nickel sheet 300 need to abut against the edge of the groove opening of the receiving groove 210 to avoid glue leakage from the gap between the two, and to improve space utilization, making the internal structure of the battery more compact.

[0067] It should be noted that if the nickel sheet 300 and the tab 400 are connected after the protective plate 200 and the nickel sheet 300 are placed on the support platform 110, the nickel sheet 300 may be bent during connection due to the obstruction of the support platform 110, or there may be a gap between the nickel sheet 300 and the protective plate 200, making it impossible to press the nickel sheet 300 and the tab 400 with the pressure block 120 to make the gap between the nickel sheet 300 and the tab 400 less than 0.1mm.

[0068] Based on the foregoing, please refer to... Figure 11 In this embodiment, the support platform 110 is provided with protrusions and positioning protrusions 112. Therefore, step S2: the protective plate 200 and the electrode tab 400 are placed on the support platform 110 in sequence, so that the end of the electrode tab 400 is attached to the middle of the nickel sheet 300; specifically, the following steps are also included: S21: The protective plate 200 is held against the positioning protrusion 112, and the middle part of the nickel sheet 300 is in contact with the bearing protrusion 111.

[0069] S22: Place the tab 400 on the support protrusion 111 such that the end of the tab 400 contacts the middle of the nickel sheet 300 that contacts the support protrusion 111.

[0070] Understandably, in this embodiment, the positioning protrusion 112 can position the protective plate 200, thereby allowing the nickel sheet 300 to smoothly contact the bearing protrusion 111. Furthermore, the positioning protrusion 112 can restrict the movement of the protective plate 200, preventing the protective plate 200 from moving the nickel sheet 300 during the pressing process, thus affecting the pre-fixing effect.

[0071] After the second connecting portion 320 of the nickel sheet 300 contacts the supporting protrusion 111, the tab 400 is placed on the supporting protrusion 111 so that the end of the tab 400 can contact the second connecting portion 320, and the transition portion 330 of the nickel sheet 300 extends relative to the tab 400, so as to ensure that the dispensing machine can dispense glue to the transition portion 330, so that the glue can flow into the gap between the tab 400 and the nickel sheet 300 to bond the tab 400 and the nickel sheet 300 together.

[0072] In summary, this embodiment uses a pressure block 120 to press down on a protective plate 200 located on a support platform 110, a nickel sheet 300 connected to the protective plate 200, and an electrode tab 400 in contact with the middle of the nickel sheet 300, thereby reducing the gap between the nickel sheet 300 and the electrode tab 400 to less than 0.1 mm. The pressure block 120 is provided with a through hole 121, which is directly opposite the end of the nickel sheet 300, allowing the glue head of the dispensing machine to extend into the through hole 121 to dispense glue to the end of the nickel sheet 300. As the glue flows from the end of the nickel sheet 300 to the middle of the nickel sheet 300, the glue flows into the gap between the nickel sheet 300 and the electrode tab 400, thereby causing the nickel sheet 300 and the electrode tab 400 to adhere together, achieving pre-fixation.

[0073] In this embodiment, after pre-fixing the tab 400 and the nickel sheet 300, the nickel sheet 300 and the tab 400 are then welded. Since the gap between the pre-fixed nickel sheet 300 and the tab 400 is less than 0.1mm, the stability and quality of the welding can be improved, and welding instability caused by excessive gap can be avoided.

[0074] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention should be included within the scope of protection of the present invention.

Claims

1. A battery pre-fixing fixture, characterized in that, include: Support platform (110) is used to support the battery protection plate (200), the nickel sheet (300) connected to the protection plate (200) and the tab (400). A pressure block (120) abuts against the support platform (110). The pressure block (120) is used to press the protective plate (200), the nickel sheet (300), and the electrode tab (400). The pressure block (120) is provided with a through hole (121) for the dispensing head of the dispensing machine to pass through to dispense glue to the end of the nickel sheet (300), thereby causing the nickel sheet (300) and the electrode tab (400) to adhere together.

2. The battery pre-fixing fixture according to claim 1, characterized in that, The support platform (110) is provided with a bearing protrusion (111); the bearing protrusion (111) abuts against the bottom of the pressure block (120); The bearing protrusion (111) is used to contact the nickel sheet (300) and the tab (400).

3. The battery pre-fixing fixture according to claim 2, characterized in that, The height of the bearing protrusion (111) is less than the thickness of the protective plate (200).

4. The battery pre-fixing fixture according to claim 1, characterized in that, The support platform (110) is provided with a positioning protrusion (112), which abuts against the side wall of the pressure block (120); the positioning protrusion (112) is used to abut against the side wall of the protective plate (200).

5. The battery pre-fixing fixture according to claim 4, characterized in that, The positioning protrusion (112) includes two interconnected positioning segments (1121), which abut against two adjacent side walls of the pressure block (120); the two positioning segments (1121) are respectively used to abut against two adjacent side walls of the protective plate (200).

6. The battery pre-fixing fixture according to claim 1, characterized in that, The support platform (110) is also provided with a snap-fit ​​protrusion (113), and the pressure block (120) is provided with a snap-fit ​​groove (123). The snap-fit ​​protrusion (113) and the snap-fit ​​groove (123) are connected and cooperated.

7. The battery pre-fixing fixture according to claim 1, characterized in that, The inner wall of the through hole (121) is provided with a guide slope (122), which is used to guide the glue to move to the end of the nickel sheet (300).

8. The battery pre-fixing fixture according to claim 1, characterized in that, The edge of the through hole (121) extends away from the support platform (110) to form a positioning boss (124). The positioning boss (124) is used to contact the dispensing machine.

9. A battery welding method based on the battery pre-fixing fixture as described in any one of claims 1-8, characterized in that, include: Connect the protection plate (200) and the nickel sheet (300); The protective plate (200) and the tab (400) are placed on the support platform (110) in sequence, so that the end of the tab (400) is attached to the middle of the nickel sheet (300); The pressure block (120) abuts against the support platform (110), and the pressure block (120) presses down the protective plate (200), the nickel sheet (300) and the tab (400). The adhesive tip extends into the through hole (121) to apply adhesive to the nickel sheet (300), so that the adhesive adheres to the end of the nickel sheet (300), thereby making the nickel sheet (300) stick to the tab (400); Separate the pressure block (120) from the protective plate (200), the nickel sheet (300), and the electrode tab (400); The nickel sheet (300) and the tab (400) are welded together using a laser welder.

10. The battery welding method according to claim 9, characterized in that, The step of connecting the protective plate (200) and the nickel sheet (300) includes: A portion of the nickel sheet (300) is placed in the receiving groove (210) of the protective plate (200); The nickel sheet (300) is connected to the inner wall of the receiving groove (210).

11. The battery welding method according to claim 9, characterized in that, The step of sequentially placing the protective plate (200) and the electrode tab (400) on the support platform (110), so that the end of the electrode tab (400) is attached to the middle of the nickel sheet (300), includes: The protective plate (200) is held against the positioning protrusion (112), and the middle part of the nickel sheet (300) is in contact with the bearing protrusion (111); The tab (400) is placed on the support protrusion (111) such that the end of the tab (400) contacts the middle of the nickel sheet (300) that is in contact with the support protrusion (111).

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