A square lithium battery welding tooling fixture

Abstract

A square lithium battery welding tooling fixture proposed by the present invention presses the aluminum shell of the square lithium battery through the effective cooperation between the first pressing plate and the second pressing plate, making the long side height of the aluminum shell of the square lithium battery straight, the connection between the aluminum shells compact and seamless, without explosion or crack during welding. The square lithium battery is preliminarily fixed by the pressing assembly, and the first pressing cylinder and the second pressing cylinder are used to apply the same pressure to the side of the pressing assembly at the same time, further ensuring the balanced position of the aluminum shell of the square lithium battery, avoiding frequent adjustment of the position of the laser welding head, and being beneficial to continuous laser welding. By providing a first concave on the first pole column positioning block and a second concave on the second pole column positioning block, the negative pole column and the positive pole column of the square lithium battery can be effectively protected when welding the aluminum shell and the cover plate, avoiding unnecessary burns or welding injuries during the welding process.

Description

Technical Field

[0001] The present invention relates to the technical field of lithium battery welding, and particularly to a welding fixture for square lithium batteries. Background Art

[0002] Compared with other batteries, lithium batteries have the characteristics of high working voltage, small size, light weight, high energy, no memory effect, no pollution, small self-discharge, and long cycle life. Therefore, lithium batteries are widely used in mobile phones, laptop computers, cameras, street lamp backup power supplies, household small appliances, energy storage power systems and other fields.

[0003] The internal structure of a lithium battery adopts a spiral winding structure or a stacked structure, and is separated by a very fine and highly permeable polyethylene film isolation material between the positive and negative electrodes. The positive electrode includes a current collector composed of lithium cobaltate (or lithium nickel cobalt manganese oxide, lithium manganate, lithium iron phosphate, etc.) and aluminum foil, and the negative electrode is composed of a current collector composed of carbonaceous materials and copper foil. Generally, an organic electrolyte solution is injected into the lithium battery. To ensure the high safety and durability of lithium batteries during use, the welding between the cover plate and the aluminum shell is very important during the manufacturing and assembly process of lithium batteries, mainly by laser welding to ensure the sealing performance between the aluminum shell and the cover plate. Factors such as whether the weld penetration on the welding surface between the aluminum shell and the cover plate is greater than 300μm, whether the welding lines are smooth, and whether the welding position is firm and reliable will directly have a certain impact on lithium batteries, including whether there is liquid leakage during the liquid injection process of lithium batteries, and whether there will be electrolyte leakage at the weld seam after a certain period of the finished lithium battery. These problems will ultimately directly affect the service life of lithium batteries.

[0004] With the development of lithium batteries, ultra-thin square lithium batteries have emerged on the market, in which the aluminum shell is composed of two aluminum plates, and the positive and negative electrode posts are on separate cover plates. However, when welding the two aluminum plates of a square lithium battery, the connection between the two aluminum plates is prone to looseness, and gaps will be generated at the connection, resulting in explosion and fire during welding, seriously affecting the welding quality; when welding the aluminum shell and the cover plate, due to the high energy of the laser, it is easy to burn or weld the structural components of the cover plate, thereby affecting the overall performance of the lithium battery. Summary of the Invention

[0005] Based on this, an embodiment of the present invention provides a welding fixture for square lithium batteries, aiming to solve the problems that when welding the two aluminum plates of a square lithium battery, the connection between the two aluminum plates is prone to looseness, and gaps will be generated at the connection, resulting in explosion and fire during welding, seriously affecting the welding quality; when welding the aluminum shell and the cover plate, due to the high energy of the laser, it is easy to burn or weld the structural components of the cover plate, thereby affecting the overall performance of the lithium battery.

[0006] To achieve the above object, the present invention proposes the following technical solutions:

[0007] A square lithium battery welding fixture for clamping and fixing a square lithium battery, comprising a substrate, a fixing frame, a limiting plate and a positioning plate; the fixing frame, the limiting plate and the positioning plate are all arranged on the substrate; one side of the positioning plate is connected to one end of the limiting plate, and the other side is opposite to one end of the fixing frame;

[0008] The fixing frame includes a first baffle, a second baffle and a fixing plate; the first baffle and the second baffle are arranged in parallel on the substrate; one end of the fixing plate is arranged on the top of the first baffle, and the other end is arranged on the top of the second baffle; the first baffle is opposite to the side of the positioning plate away from the limiting plate; a plurality of first pressing cylinders and a plurality of second pressing cylinders are arranged between the fixing plate and the substrate; the first pressing cylinders are arranged on the fixing plate; the second pressing cylinders are arranged on the substrate; the first pressing cylinders and the second pressing cylinders are in one-to-one correspondence.

[0009] Further, the square lithium battery welding fixture further includes a pressing assembly; the pressing assembly is detachably arranged between the fixing frame and the limiting plate; one end of the pressing assembly abuts against the positioning plate; the side of the pressing assembly away from the fixing frame abuts against the limiting plate; the pressing assembly includes a first pressing plate and a second pressing plate with the same structure; the first pressing plate and the second pressing plate are arranged oppositely.

[0010] Further, a first profiling groove is arranged on the side of the first pressing plate close to the second pressing plate; a second profiling groove is arranged on the side of the second pressing plate close to the first pressing plate; both the first profiling groove and the second profiling groove are adapted to the square lithium battery.

[0011] Further, the sum of the depth of the first profiling groove and the depth of the second profiling groove is less than the thickness of the square lithium battery, so that after the first pressing plate and the second pressing plate press and fix the square lithium battery, a space is left between the first pressing plate and the second pressing plate for the long side of the aluminum shell of the square lithium battery to be exposed, ensuring that welding can be carried out.

[0012] Further, first connecting holes are arranged at both ends of the first pressing plate; second connecting holes adapted to the first connecting holes are arranged at both ends of the second pressing plate. In the present invention, the pressing assembly loaded with the square lithium battery can be preliminarily fixed by passing a cable tie or a shaft pin through the first connecting hole and the second connecting hole in sequence, so as to facilitate handling and placement.

[0013] Further, the square lithium battery welding tooling fixture further includes a support plate, a first pole column positioning block, a side plate, a pressing strip and a third pressing cylinder; the support plate is arranged on the side of the fixing plate away from the substrate; one end of the support plate abuts against the positioning plate; one side of the support plate abuts against the limiting plate; the first pole column positioning block is arranged on the side of the support plate away from the substrate; one end of the first pole column positioning block abuts against the positioning plate, and the other end abuts against the pole column of the square lithium battery; the side plate is arranged at one end of the support plate away from the limiting plate; one end of the pressing strip is arranged at the top of the side plate, and the other end is arranged at the top of the limiting plate; the bottom of the pressing strip abuts against the aluminum shell of the square lithium battery; the third pressing cylinder is arranged at one end of the support plate away from the first pole column positioning block.

[0014] Further, a first concave is provided at one end of the first pole column positioning block away from the positioning plate; the first concave is adapted to the pole column of the square lithium battery. During the process of welding the long side of the aluminum shell and the cover plate, the first concave can effectively protect the negative pole column and the positive pole column of the square lithium battery from being laser burned or welded.

[0015] Further, the square lithium battery welding tooling fixture further includes a second pole column positioning block; the second pole column positioning block is arranged on the side of the limiting plate close to the fixing frame; one end of the second pole column positioning block abuts against the positioning plate, and the other end abuts against the pole column of the square lithium battery.

[0016] Further, a second concave is provided at one end of the second pole column positioning block away from the positioning plate; the second concave is adapted to the pole column of the square lithium battery. When welding the short side of the aluminum shell and the cover plate, the second concave can effectively protect the negative pole column and the positive pole column of the square lithium battery from being laser burned or welded.

[0017] A square lithium battery welding tooling fixture proposed by the present invention presses the aluminum shell of the square lithium battery through the effective cooperation between the first pressing plate and the second pressing plate, making the long side height of the aluminum shell of the square lithium battery straight, the connection between the aluminum shells compact and seamless, without explosion or crack during welding; at the same time, after the long side of the aluminum shell of the square lithium battery is welded, the entire square lithium battery is shaped, thereby ensuring that there is no gap between the long side of the cover plate of the square lithium battery and the aluminum shell, and between the short side of the cover plate and the aluminum shell, and the height plane is straight. The square lithium battery is initially fixed by the pressing assembly, and the first pressing cylinder and the second pressing cylinder are used to apply the same pressure to the side of the pressing assembly at the same time, further ensuring the balanced position of the aluminum shell of the square lithium battery, avoiding frequent adjustment of the position of the laser welding head, and being conducive to continuous laser welding. By providing the first concave on the first pole positioning block and the second concave on the second pole positioning block, the negative pole and positive pole of the square lithium battery can be effectively protected when welding the aluminum shell and the cover plate, avoiding unnecessary burns or welding injuries during the welding process. By providing the third pressing cylinder and the pressing strip, the square lithium battery is completely fixed, ensuring that the square lithium battery will not shift during welding, improving the accuracy and stability of welding, and also improving the safety of welding.

[0018] The present invention can weld each side of the square lithium battery (including the long side of the aluminum shell, the long side and short side of the positive and negative cover plates, etc.) on the same tooling fixture, realizing three-dimensional welding of the square lithium battery; moreover, there is no gap at the welding joint, and there will be no bad problems such as welding melting, explosion, and crack. The welding is convenient, fast, and has a high utilization rate, and can be applied to the welding of longer, narrower, and thinner square lithium batteries. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on the structures shown in these drawings without creative efforts.

[0020] Figure 1 It is a three-dimensional structural schematic diagram of the square lithium battery welding tooling fixture described in Embodiment 1 of the present invention;

[0021] Figure 2 is Figure 1 the exploded view of the pressing assembly in;

[0022] Figure 3 is Figure 2 the three-dimensional structural schematic diagram of the second pressing plate in;

[0023] Figure 4Schematic three-dimensional structure diagram of the square lithium battery welding tooling fixture described in Embodiment 2 of the present invention;

[0024] Figure 5 is Figure 4 Schematic three-dimensional structure diagram of the first pole column positioning block in

[0025] Figure 6 Schematic three-dimensional structure diagram of the square lithium battery welding tooling fixture described in Embodiment 3 of the present invention;

[0026] Figure 7 is Figure 6 Schematic three-dimensional structure diagram of the second pole column positioning block in

[0027] The realization, functional features and advantages of the object of the present invention will be further described with reference to the embodiments and the accompanying drawings. Specific embodiments

[0028] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts belong to the scope of protection of the present invention.

[0029] It should be noted that if there are directional indications (such as up, down, left, right, front, back, top, bottom...) involved in the embodiments of the present invention, the directional indications are only used to explain the relative positional relationship and movement conditions between components in a specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indications will also change accordingly.

[0030] In this application, unless otherwise clearly defined and limited, the terms "installed", "connected", "connected", "fixed" and other terms should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the internal communication of two components or the interaction relationship between two components, unless otherwise clearly limited. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific situations.

[0031] It should be noted that when an element is referred to as "fixed to" or "disposed on" another element, it can be directly on the other element or there may also be an intermediate element. When an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be an intermediate element at the same time.

[0032] In addition, if the embodiments of the present invention involve descriptions such as "first" and "second", these descriptions of "first", "second", etc. are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions between various embodiments may be combined with each other, but it must be based on the ability of those of ordinary skill in the art to implement. When the combination of technical solutions results in contradictions or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0033] With the development of lithium batteries, ultra-thin square lithium batteries have emerged on the market, in which the aluminum shell is composed of two aluminum plates, and the positive and negative electrode posts are each on one cover plate. However, when welding the two aluminum plates of the square lithium battery, the connection between the two aluminum plates is prone to looseness, and gaps will be generated at the connection, resulting in explosion and fire during welding, seriously affecting the welding quality; when welding the aluminum shell and the cover plate, due to the high energy of the laser, it is easy to burn or weld the structural components of the cover plate, resulting in an impact on the overall performance of the lithium battery. To solve the above technical problems, the present invention proposes a square lithium battery welding tooling fixture.

[0034] Embodiment 1:

[0035] As Figure 1 shown, a square lithium battery welding tooling fixture proposed by an embodiment of the present invention is used to clamp and fix a square lithium battery A, and includes a substrate 1, a fixing frame 2, a limiting plate 3 and a positioning plate 4; the fixing frame 2, the limiting plate 3 and the positioning plate 4 are all arranged on the substrate 1; one side of the positioning plate 4 is connected to one end of the limiting plate 3, and the other side is opposite to one end of the fixing frame 2; the fixing frame 2 includes a first baffle 21, a second baffle 22 and a fixing plate 23; the first baffle 21 and the second baffle 22 are arranged in parallel on the substrate 1; one end of the fixing plate 23 is arranged on the top of the first baffle 21, and the other end is arranged on the top of the second baffle 22; one side of the first baffle 21 is opposite to the side of the positioning plate 4 away from the limiting plate 3; a plurality of first pressing cylinders 5 and a plurality of second pressing cylinders 6 are arranged between the fixing plate 23 and the substrate 1; the first pressing cylinders 5 are arranged on the fixing plate 23; the second pressing cylinders 6 are arranged on the substrate 1; the first pressing cylinders 5 and the second pressing cylinders 6 are in one-to-one correspondence.

[0036] Referring to Figure 1 and Figure 2, in this embodiment, the square lithium battery welding fixture further includes a pressing component 7; the pressing component 7 is detachably arranged between the fixed frame 2 and the limiting plate 3; one end of the pressing component 7 abuts against the positioning plate 4; the side of the pressing component 7 away from the fixed frame abuts against the limiting plate 3; the pressing component 7 includes a first pressing plate 71 and a second pressing plate 72 with the same structure; the first pressing plate 71 and the second pressing plate 72 are arranged oppositely.

[0037] Refer to Figure 2 and Figure 3 , in this embodiment, a first profiling groove 711 is arranged on the side of the first pressing plate 71 close to the second pressing plate 72; a second profiling groove 721 is arranged on the side of the second pressing plate 72 close to the first pressing plate 71; both the first profiling groove 711 and the second profiling groove 721 are adapted to the square lithium battery A.

[0038] The sum of the depth of the first profiling groove 711 and the depth of the second profiling groove 721 is less than the thickness of the square lithium battery A, so that after the first pressing plate 71 and the second pressing plate 72 press and fix the square lithium battery A, there is a space for the long side of the aluminum shell of the square lithium battery A to be exposed between the first pressing plate 71 and the second pressing plate 72, ensuring that welding can be carried out.

[0039] Both ends of the first pressing plate 71 are provided with first connection holes 712; both ends of the second pressing plate 72 are provided with second connection holes 722 adapted to the first connection holes 712. In this embodiment, the pressing component 7 loaded with the square lithium battery A can be preliminarily fixed by passing a cable tie or a shaft pin through the first connection holes 712 and the second connection holes 722 in sequence, so as to facilitate handling and placement.

[0040] In this embodiment, when welding the long side of the aluminum shell of the square lithium battery A:

[0041] Since the aluminum shell of the square lithium battery A is formed by connecting two aluminum plates, two long sides formed between the two aluminum plates need to be welded. First, place the square lithium battery A to be welded in the first profiling groove 712 of the first pressing plate 71, and then gently cover the second pressing plate 72 on the side of the square lithium battery A away from the first pressing plate 71. At this time, the square lithium battery A is positioned between the first profiling groove 711 and the second profiling groove 721. Then, use a cable tie or a pin to sequentially pass through the first connection hole 712 and the second connection hole 722 to initially fasten the first pressing plate 71 and the second pressing plate 72 to prevent the square lithium battery A from falling off the pressing assembly 7 during handling. Place the pressing assembly 7 loaded with the square lithium battery A to be welded vertically between the fixed frame 2 and the limiting plate 3, and press one side of the pressing assembly 7 tightly against the limiting plate 3 and one end of the pressing assembly 7 tightly against the positioning plate 4. At the same time, start the first pressing cylinder 5 and the second pressing cylinder 6 to press the pressing assembly 7 to further fix the square lithium battery A. Finally, the long sides of the aluminum shell of the fixed square lithium battery A are highly straight, and the connection between the aluminum shells is compact and seamless. After finally checking the gap and impurities between the two aluminum plates, use laser welding to weld the long sides of the aluminum shell of the square lithium battery A. Similarly, the other long side of the aluminum shell of the square lithium battery A is also welded. After welding is completed, turn off the first pressing cylinder 5 and the second pressing cylinder 6, and separate the first pressing plate 71 and the second pressing plate 72 to complete the welding of the long sides of the aluminum shell of the square lithium battery A.

[0042] A square lithium battery welding tooling fixture proposed in an embodiment of the present invention presses the aluminum shell of the square lithium battery A through the effective cooperation between the first pressing plate 71 and the second pressing plate 72, making the long sides of the aluminum shell of the square lithium battery A highly straight, and the connection between the aluminum shells is compact and seamless, without explosion or cracks during welding. At the same time, after the long sides of the aluminum shell of the square lithium battery A are welded, the entire square lithium battery A is shaped, further ensuring that there is no gap and the height plane is straight between the long sides of the cover plate and the aluminum shell of the square lithium battery A, and between the short sides of the cover plate and the aluminum shell. The pressing assembly 7 is used to initially fix the square lithium battery, and the first pressing cylinder 5 and the second pressing cylinder 6 are used to apply the same pressure to the side of the pressing assembly 7 at the same time, further ensuring the balanced position of the aluminum shell of the square lithium battery A, avoiding frequent adjustment of the position of the laser welding head, and facilitating continuous laser welding.

[0043] Embodiment 2:

[0044] As Figure 4As shown in the figure, a square lithium battery welding fixture proposed in an embodiment of the present invention is used to clamp and fix a square lithium battery A, and includes a substrate 1, a fixing frame 2, a limiting plate 3 and a positioning plate 4; the fixing frame 2, the limiting plate 3 and the positioning plate 4 are all arranged on the substrate 1; one side of the positioning plate 4 is connected to one end of the limiting plate 3, and the other side is opposite to one end of the fixing frame 2; the fixing frame 2 includes a first baffle 21, a second baffle 22 and a fixing plate 23; the first baffle 21 and the second baffle 22 are arranged in parallel on the substrate 1; one end of the fixing plate 23 is arranged on the top of the first baffle 21, and the other end is arranged on the top of the second baffle 22; one side of the first baffle 21 is opposite to the side of the positioning plate 4 away from the limiting plate 3; a plurality of first pressing cylinders 5 and a plurality of second pressing cylinders 6 are arranged between the fixing plate 23 and the substrate 1; the first pressing cylinders 5 are arranged on the fixing plate 23; the second pressing cylinders 6 are arranged on the substrate 1; the first pressing cylinders 5 and the second pressing cylinders 6 are in one-to-one correspondence.

[0045] The square lithium battery welding fixture further includes a support plate 81, a first pole column positioning block 82, a side plate 83, a pressing strip 84 and a third pressing cylinder 85; the support plate 81 is arranged on the side of the fixing plate 23 away from the substrate 1; one end of the support plate 82 abuts against the positioning plate 4; one side of the support plate 81 abuts against the limiting plate 3; the first pole column positioning block 82 is arranged on the side of the support plate 81 away from the substrate 1; one end of the first pole column positioning block 82 abuts against the positioning plate 4, and the other end abuts against the pole column of the square lithium battery A; the side plate 83 is arranged at one end of the support plate 81 away from the limiting plate 3; one end of the pressing strip 84 is arranged on the top of the side plate 83, and the other end is arranged on the top of the limiting plate 3; the bottom of the pressing strip 83 abuts against the aluminum shell of the square lithium battery A; the third pressing cylinder 85 is arranged at one end of the support plate 81 away from the first pole column positioning block 82.

[0046] Referring to Figure 5 , in this embodiment, a first concave portion 821 is provided at one end of the first pole column positioning block 82 away from the positioning plate 4; the first concave portion 821 is adapted to the pole column of the square lithium battery A. During the process of welding the long side of the aluminum shell and the cover plate of the square lithium battery A, the first concave portion 821 can effectively protect the negative pole column and the positive pole column of the square lithium battery A from being burned or welded by laser.

[0047] In this embodiment, when welding the long side of the aluminum shell and the cover plate of the square lithium battery A:

[0048] The cover plate of the square lithium battery A includes a positive cover plate and a negative cover plate, and both the positive cover plate and the negative cover plate have two long sides. When welding the long side of the negative cover plate and the aluminum shell, first place the square lithium battery A on the support plate, and place the negative pole column of the negative cover plate on the first concave portion 821 of the first pole column positioning block 82; then turn on the third pressing cylinder 85 to press one end of the positive cover plate of the square lithium battery A, and use screws to press the pressing strip 84 against the flat surface of the aluminum shell of the square lithium battery A (the end near the negative pole column); after fixing the square lithium battery A, use laser welding to weld the long side of the negative cover plate and the aluminum shell; since four long sides need to be welded, after each side is welded, it is necessary to turn off the third pressing cylinder 85 and open the pressing strip 84 to facilitate the corresponding flipping of the square lithium battery A until the welding of the aluminum shell and the long side of the cover plate is completed.

[0049] A square lithium battery welding tooling fixture proposed in an embodiment of the present invention, through the first concave portion 821 provided on the first pole column positioning block 82, can effectively protect the negative pole column and the positive pole column of the square lithium battery A when welding the aluminum shell and the long side of the cover plate, avoiding unnecessary burns or welding injuries during the welding process. By setting the third pressing cylinder 85 and the pressing strip 84 to completely fix the square lithium battery A, it is ensured that the square lithium battery A will not shift during welding, improving the accuracy and stability of welding, and at the same time improving the safety of welding.

[0050] Embodiment 3:

[0051] As Figure 6 shown, a square lithium battery welding tooling fixture proposed in an embodiment of the present invention is used to clamp and fix the square lithium battery A, and includes a substrate 1, a fixing frame 2, a limiting plate 3 and a positioning plate 4; the fixing frame 2, the limiting plate 3 and the positioning plate 4 are all arranged on the substrate 1; one side of the positioning plate 4 is connected to one end of the limiting plate 3, and the other side is opposite to one end of the fixing frame 2; the fixing frame 2 includes a first baffle 21, a second baffle 22 and a fixing plate 23; the first baffle 21 and the second baffle 22 are arranged in parallel on the substrate 1; one end of the fixing plate 23 is arranged on the top of the first baffle 21, and the other end is arranged on the top of the second baffle 22; one side of the first baffle 21 is opposite to the side of the positioning plate 4 away from the limiting plate 3; a plurality of first pressing cylinders 5 and a plurality of second pressing cylinders 6 are arranged between the fixing plate 23 and the substrate 1; the first pressing cylinders 5 are arranged on the fixing plate 23; the second pressing cylinders 6 are arranged on the substrate 1; the first pressing cylinders 5 and the second pressing cylinders 6 are in one-to-one correspondence.

[0052] The square lithium battery welding tooling fixture further includes a second pole column positioning block 9; the second pole column positioning block 9 is arranged on one side of the limiting plate 3 close to the fixing frame 2; one end of the second pole column positioning block 9 abuts against the positioning plate 4, and the other end abuts against the pole column of the square lithium battery A.

[0053] Referring to Figure 7 , in this embodiment, a second concave portion 91 is arranged at one end of the second pole column positioning block 9 away from the positioning plate 4; the second concave portion 91 is adapted to the pole column of the square lithium battery A. When welding the short sides of the aluminum shell and the cover plate, the second concave portion 91 can effectively protect the negative pole column and the positive pole column of the square lithium battery from being burned or welded by laser.

[0054] In this embodiment, when welding the short sides of the aluminum shell and the cover plate of the square lithium battery A:

[0055] The cover plate of the square lithium battery A includes a positive cover plate and a negative cover plate, and both the positive cover plate and the negative cover plate have two short sides. When welding the short side of the negative cover plate and the aluminum shell, first place the square lithium battery A between the fixing frame 2 and the limiting plate 3, and abut one side of the square lithium battery A against the limiting plate 3, place the negative pole column of the negative cover plate on the second concave portion 91 of the second pole column positioning block 9, and then simultaneously turn on the first pressing cylinder 5 and the second pressing cylinder 6 to press and fix the square lithium battery A; after fixing the square lithium battery A, use laser welding to weld the short side of the negative cover plate and the aluminum shell; since four short sides need to be welded, after each short side is welded, it is necessary to turn off the first pressing cylinder 5 and the second pressing cylinder 6, and perform corresponding flipping on the square lithium battery A until the welding between the aluminum shell and the short side of the cover plate is completed.

[0056] A square lithium battery welding tooling fixture proposed by an embodiment of the present invention, through the second concave portion 91 arranged on the second pole column positioning block 9, can effectively protect the negative pole column and the positive pole column of the square lithium battery A when welding the short sides of the aluminum shell and the cover plate, avoiding unnecessary burns or welds during the welding process.

[0057] A square lithium battery welding tooling fixture proposed by an embodiment of the present invention, during the overall welding process of the square lithium battery A, including the welding between aluminum shells, the welding between the aluminum shell and the long side of the cover plate, and the welding between the aluminum shell and the short side of the cover plate, the pressing assembly 7, the first pole column positioning block 82, and the second pole column positioning block 9 all play a role in protecting important components such as the liquid injection hole on the cover plate.

[0058] A square lithium battery welding tooling fixture proposed by an embodiment of the present invention, most of the components are made of aluminum metal material, and the components used in places where the heat during welding is severe can also be made of copper metal material or other heat-resistant metal materials.

[0059] The present invention can weld each side of the square lithium battery A (including the long sides of the aluminum shell, the long and short sides of the positive and negative cover plates, etc.) on the same tooling fixture, realizing three-dimensional welding of the square lithium battery A; moreover, there are no gaps at the welding points, and no bad problems such as welding melting, explosion and fire, and cracks will occur. The welding is convenient and fast, and the utilization rate is high, and it can be applied to the welding of longer, narrower and thinner square lithium batteries A.

[0060] The above are only the preferred embodiments of the present invention, and do not limit the patent scope of the present invention accordingly. Any equivalent structural transformation made under the inventive concept of the present invention by using the content of the specification and drawings of the present invention, or direct / indirect application in other related technical fields is included in the patent protection scope of the present invention.

Claims

1. A square lithium battery welding tooling fixture for clamping and fixing a square lithium battery, characterized in that, It includes a substrate, a fixing frame, a limiting plate and a positioning plate; the fixing frame, the limiting plate and the positioning plate are arranged in parallel on the substrate; one side of the positioning plate is connected to one end of the limiting plate, and the other side is opposite to one end of the fixing frame; the fixing frame includes a first baffle plate, a second baffle plate and a fixing plate; the first baffle plate and the second baffle plate are both arranged on the substrate; one end of the fixing plate is arranged on the top of the first baffle plate, and the other end is arranged on the top of the second baffle plate; the first baffle plate is opposite to the side of the positioning plate away from the limiting plate; a plurality of first pressing cylinders and a plurality of second pressing cylinders are arranged between the fixing plate and the substrate; the first pressing cylinders are arranged on the fixing plate; the second pressing cylinders are arranged on the substrate; the first pressing cylinders and the second pressing cylinders are in one-to-one correspondence; The square lithium battery welding fixture further includes a pressing assembly; the pressing assembly is detachably arranged between the fixing frame and the limiting plate; one end of the pressing assembly abuts against the positioning plate; the side of the pressing assembly away from the fixing frame abuts against the limiting plate; the pressing assembly includes a first pressing plate and a second pressing plate with the same structure; the first pressing plate and the second pressing plate are arranged oppositely; a first profiling groove is arranged on the side of the first pressing plate close to the second pressing plate; a second profiling groove is arranged on the side of the second pressing plate close to the first pressing plate; the first profiling groove and the second profiling groove are both adapted to the square lithium battery; the sum of the depths of the first profiling groove and the second profiling groove is less than the thickness of the square lithium battery; first connection holes are arranged at both ends of the first pressing plate; second connection holes adapted to the first connection holes are arranged at both ends of the second pressing plate.

2. The square lithium battery welding tooling fixture according to claim 1, wherein The square lithium battery welding fixture further includes a support plate, a first pole column positioning block, a side plate, a pressing strip and a third pressing cylinder; the support plate is arranged on the side of the fixing plate away from the substrate; one end of the support plate abuts against the positioning plate; one side of the support plate abuts against the limiting plate; the first pole column positioning block is arranged on the side of the support plate away from the substrate; one end of the first pole column positioning block abuts against the positioning plate, and the other end abuts against the pole column of the square lithium battery; the side plate is arranged at one end of the support plate away from the limiting plate; one end of the pressing strip is arranged on the top of the side plate, and the other end is arranged on the top of the limiting plate; the bottom of the pressing strip abuts against the aluminum shell of the square lithium battery; the third pressing cylinder is arranged at one end of the support plate away from the first pole column positioning block.

3. The square lithium battery welding tooling fixture according to claim 2, characterized in that, a first concave is arranged at the end of the first pole column positioning block away from the positioning plate; the first concave is adapted to the pole column of the square lithium battery.

4. The square lithium battery welding tooling fixture according to claim 1, characterized in that, The square lithium battery welding fixture further includes a second pole column positioning block; the second pole column positioning block is arranged on the side of the limiting plate close to the fixing frame; one end of the second pole column positioning block abuts against the positioning plate, and the other end abuts against the pole column of the square lithium battery.

5. The square lithium battery welding tooling fixture according to claim 4, characterized in that, One end of the second pole positioning block away from the positioning plate is provided with a second concave; the second concave is adapted to the pole of the square lithium battery.

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