Lithium ion battery and welding machine thereof

Abstract

The invention relates to the technical field of battery welding, in particular to a lithium ion battery and a welding machine thereof. Comprising a shell and a battery module, the battery module comprises two brackets and a plurality of battery cells inserted between the two brackets; the two brackets are symmetrically arranged; the protection plate is positioned on the side of the cell; the protection plate is bonded with the two supports through structural adhesive. Aluminum bars are welded to the sides, away from each other, of the two supports; the aluminum bar is in contact with the corresponding end part of the battery cell; the shell comprises a main shell with two ports, a shell bottom and a shell cover; the main shell is welded with the shell bottom; a novel large cylindrical battery cell is adopted, a traditional collection wire harness is omitted, laser welding of the shell and the cover plate is adopted, a low-voltage socket is innovatively designed, a high-integration battery system assembly scheme is achieved, and standardized development, cost reduction, after-sale convenience and reliable manufacturing and installation are achieved.

Description

Technical Field

[0001] This invention relates to the field of battery welding technology, specifically to a lithium-ion battery and its welding machine. Background Technology

[0002] Traffic congestion is a serious problem in major Chinese cities. Electric bicycles are flexible and convenient, greatly facilitating people's travel. The government has provided strong support for electric bicycle policies, and to further ensure the safety of lithium battery systems, the government has formulated new national standards for electric bicycles.

[0003] In the existing field of battery system technology, there are many problems that urgently need to be solved:

[0004] a. Cell and Welding: Traditional batteries mostly use 18650 cells, which have a small capacity. To meet usage demands, a large number of cells need to be connected in parallel. This results in a large number of cells, which not only increases the workload of parallel welding but also easily leads to problems such as incomplete soldering and desoldering during the welding process, making it difficult to guarantee the reliability of the connection and thus affecting the overall performance and stability of the battery system. b. Data Acquisition Harness: Previous battery systems relied on traditional data acquisition harnesses to collect cell temperature and voltage data. Due to the long connection paths and numerous nodes in the harnesses, on the one hand, the cost of the harnesses increases; on the other hand, the excessive number of connection nodes also increases the probability of failure, making it difficult to guarantee the accuracy and stability of the acquired signals.

[0005] c. Casing Design and Welding: Most battery products on the market currently use plastic casings, which have limited strength and cannot effectively protect the internal cells in the event of impacts or compression. In extreme situations such as thermal runaway of the cells, the plastic casing is easily damaged, leading to serious safety accidents such as fires. Furthermore, the traditional connection method between the casing and the cover is relatively complex, and the assembly process is cumbersome, resulting in low production efficiency.

[0006] d. Low-voltage interface plug-in: Traditional low-voltage interface plug-ins are mostly externally mounted, which not only requires adapter plugs and adapter harnesses to connect with the protection board, but also increases the process assembly steps. Moreover, the increase in connection links brings more safety hazards. During use, externally mounted plug-ins are prone to loosening and poor contact due to external forces, vibrations and other factors, which affect the normal operation of the battery system.

[0007] In lithium-ion battery manufacturing, current technology involves a casing and internal battery modules. The casing includes a main shell with openings at both ends, a cover, and a bottom. Before assembling the battery modules, the main shell and cover must be welded. Typically, the main shell is placed on a welding machine table, the bottom is positioned at the main shell's opening, and the main shell is clamped. Laser welding is then performed by a welding arm driving the welding head. However, current technology has problems: the main shell is thin and lacks internal support, making it prone to deformation during clamping, affecting weld quality. If not clamped, displacement during welding can lead to misaligned welds; uneven heating during welding also causes casing deformation, resulting in poor weld quality, compromised casing sealing and structural strength, and ultimately reduced battery performance and safety. These are all technical problems that urgently need to be solved. Summary of the Invention

[0008] To overcome the shortcomings of existing technologies, this invention proposes a lithium-ion battery and its welding machine. This invention adopts a new type of large cylindrical battery cell, eliminates the traditional data acquisition harness, uses laser welding of the shell and cover plate, and innovatively designs a low-voltage socket to achieve a highly integrated battery system assembly solution, achieving standardized development, cost reduction, convenient after-sales service, and reliable manufacturing and installation.

[0009] The technical solution adopted by this invention to solve its technical problem is as follows: A lithium-ion battery according to this invention includes a casing and a battery module; the battery module includes two supports and a plurality of battery cells inserted between the two supports; the two supports are symmetrically arranged; a protection plate is located on the side of the battery cell; the protection plate is bonded to the two supports by structural adhesive; aluminum bars are welded to the two supports on opposite sides; the aluminum bars are in contact with the corresponding ends of the battery cells; the casing includes a main casing with two ports, a casing bottom, and a casing cover; the main casing is welded to the casing bottom; the low-voltage socket in the battery module is installed on the main casing.

[0010] A lithium-ion battery welding machine is disclosed, which is used to weld the lithium-ion battery. The welding machine is used to weld the main shell and the bottom of the shell. The welding machine includes a welding table and a three-coordinate welding arm disposed on the upper surface of the welding table. A welding head is disposed on the three-coordinate welding arm. Insertion holes are evenly disposed on the welding table. Adjacent insertion holes are disposed close to each other. Insertion rods are vertically inserted into the insertion holes. The upper end of the insertion rod is close to the upper port of the main shell.

[0011] Preferably, the upper surface of the welding platform is provided with a guide hole; a guide rod is slidably connected in the guide hole; a bearing plate is fixedly connected to the upper end of a plurality of guide rods; a bearing hole is provided through the top and bottom of the bearing plate; the position of the bearing hole corresponds one-to-one with the insertion hole; the diameter of the bearing hole is adapted to the diameter of the insertion hole; threaded holes are provided through the top and bottom of the guide rods and the bearing plate; bolts are threadedly connected in the threaded holes.

[0012] Preferably, the inner wall of the socket is slidably sealed with an anti-blocking block; the anti-blocking block is connected to the bottom wall of the socket by a first spring; the socket is provided with a first vent hole extending downwards; and the weight of the insertion rod is greater than the elastic force of the first spring.

[0013] Preferably, the welding station has a drive groove inside; a drive plate is slidably and sealingly connected inside the drive groove; the drive plate divides the drive groove into an upper cavity and a lower cavity; a vertical groove is provided through the drive groove facing upward; a vertical bar is slidably connected inside the vertical groove; the lower end of the vertical bar is fixedly connected to the drive plate; a clamping groove is vertically provided on the outer wall of the insertion rod; a clamping bar is slidably and sealingly connected inside the clamping groove; a first liquid hole communicating with the bottom of the clamping groove is provided at the lower position of the arc-shaped outer wall of the insertion rod; an annular groove is provided on the inner wall of the insertion hole; the annular groove communicates with the lower cavity through a second liquid hole.

[0014] Preferably, the drive plate is connected to the bottom of the drive groove by a second spring; the upper end of the vertical bar is provided with an L-shaped groove that communicates with the vertical outer wall; the L-shaped bar is horizontally slidably connected in the L-shaped groove; the L-shaped bar is connected to the bottom of the L-shaped groove by a third spring; the inner wall of the vertical groove is uniformly provided with slots; the lower end of the L-shaped bar can be inserted into the slots; the lower end of the L-shaped bar is inclined downwards with a slope.

[0015] Preferably, a U-shaped groove is provided at the lower position of the arc-shaped outer wall of the insert rod; a U-shaped strip is slidably and sealingly connected in the U-shaped groove; the U-shaped strip is connected to the bottom of the U-shaped groove by a fourth spring; the lower end of the U-shaped strip is set at the same height as the lower end of the first liquid hole; the lower end of the U-shaped strip can be inserted into the annular groove.

[0016] Preferably, the bottom of the annular groove is uniformly provided with anti-rotation grooves; the lower end of the U-shaped strip can be inserted into the anti-rotation groove.

[0017] Preferably, the clamping strip is composed of multiple stacked strips; the upper and lower strips are slidably sealed together, and the strips are connected to the bottom of the clamping groove by a limiting rope.

[0018] The beneficial effects of this invention are as follows:

[0019] 1. This invention uses a new type of large cylindrical battery cell, eliminates the traditional data acquisition harness, uses laser welding of the shell and cover plate, and innovatively designs a low-voltage socket to achieve a highly integrated battery system assembly solution, achieving standardized development, cost reduction, convenient after-sales service, and reliable manufacturing and installation.

[0020] 2. Because the inner and outer walls of the main shell are restricted by inserting rods, the position of the main shell can be restricted, thereby achieving the purpose of limiting the position. The inner and outer walls of the main shell are restricted and supported by the inserting rods, preventing deformation during the welding process of the main shell, thus ensuring the stability of the weld between the main shell and the shell bottom, and improving the weld quality between the main shell and the shell bottom. In addition, the welding machine can be used for welding main shells and shell bottoms of different specifications, with a wide welding range.

[0021] 3. This invention changes the placement position of the bearing plate by adjusting the bolts, thereby ensuring the welding effect of the welding machine on the main shell while making the insert rod applicable to main shells of different heights, thus increasing the welding range. Attached Figure Description

[0022] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0023] Figure 1 This is a perspective view of the lithium-ion battery in this invention;

[0024] Figure 2 This is a perspective view of the battery module in this invention;

[0025] Figure 3 yes Figure 1 Exploded view;

[0026] Figure 4 This is a perspective view of the welding machine in this invention;

[0027] Figure 5 yes Figure 4 A three-dimensional image showing the bottom of the shell;

[0028] Figure 6 yes Figure 5 Enlarged view of point A in the middle;

[0029] Figure 7 yes Figure 5 Enlarged view of point B in the middle;

[0030] Figure 8 This is a partial sectional view of the welding machine in this invention;

[0031] Figure 9 yes Figure 8 Mid-section view;

[0032] Figure 10 yes Figure 9 Enlarged view of point C in the middle;

[0033] Figure 11 yes Figure 9 Enlarged view of point D in the middle;

[0034] Figure 12 This is a diagram showing the location of the U-shaped groove in this invention.

[0035] In the diagram: 1. Housing 1, Main Housing 11, Housing Bottom 12, Housing Cover 13, Battery Module 2, Bracket 21, Battery Cell 22, Protection Board 23, Aluminum Bar 24, Low-Voltage Socket 25, Welding Station 3, Socket 31, Annular Groove 311, Second Liquid Hole 312, Anti-Rotation Groove 313, Guide Hole 32, First Vent Hole 33, Drive Groove 34, Upper Cavity 341, Lower Cavity 342, Drive Board 35, Vertical Groove 36, Slot 361, Second Spring Spring 37, three-coordinate welding arm 4, welding head 41, insert rod 5, clamping groove 51, clamping strip 52, sheet 521, limiting rope 522, first liquid hole 53, U-shaped groove 54, U-shaped strip 55, fourth spring 56, guide rod 6, bearing plate 61, bearing hole 62, threaded hole 63, bolt 64, anti-blocking block 7, first spring 71, vertical bar 8, L-shaped groove 81, L-shaped strip 82, third spring 83, inclined plane 84. Detailed Implementation

[0036] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below in conjunction with specific embodiments.

[0037] like Figures 1 to 12 As shown, the present invention includes the following embodiments:

[0038] Example 1:

[0039] A lithium-ion battery includes a housing 1 and a battery module 2; the battery module 2 includes two supports 21 and a plurality of battery cells 22 inserted between the two supports 21; the two supports 21 are symmetrically arranged; a protection plate 23 is located on the side of the battery cell 22; the protection plate 23 is bonded to the two supports 21 by structural adhesive; aluminum bars 24 are welded to the two supports 21 on opposite sides; the aluminum bars 24 are in contact with the corresponding ends of the battery cell 22; the housing 1 includes a main shell 11 with two ports, a bottom shell 12 and a cover shell 13; the main shell 11 is welded to the bottom shell 12; a low-voltage socket 25 in the battery module 2 is installed on the main shell 11.

[0040] The battery module 2 contains 13 cells 22, employing a new type of large cylindrical cell 2246142 with a capacity of 30Ah, which is 10 times that of the traditional 18650 cell 22. This significantly reduces the number of cells 22, minimizes parallel welding, and ensures reliable connections. Structural adhesive can be selectively applied to the ends of the 13 cells 22. The two ends of each cell 22 are inserted into two brackets 21, close together on one side. Then, the protection plate 23 is bonded to the two brackets 21 using structural adhesive. On the side of the battery cell 22, aluminum bars 24 are placed on the terminals of the battery cell 22 and laser welded. The aluminum bars 24 are then welded to the protection board 23. The main casing 11 and bottom casing of the empty casing are welded together using a welding machine. The battery module 2 is placed inside the main casing 11. The low-voltage socket 25 is connected to the main casing 11 using bolts 64. Finally, the casing cover 13 is placed on the port of the main casing 11 and welded. The protective cover (not shown in the figure) is then installed. After testing, the battery is removed from the production line. The protection board 23 uses materials to collect electrical signals from the battery cell 22. The lithium-ion battery 2) in this embodiment eliminates the traditional data acquisition harness and uses the aluminum bar 24 at the terminal position of the cell 22 to directly weld to the protection board 23 to collect temperature and voltage. The advantage is that it reduces the connection path and lowers the cost by 30%. The outer shell 1 adopts a laser welding scheme for the main shell 11, shell cover 13 and shell bottom 12, which provides the strength of the lithium-ion battery, facilitates assembly and installation, and improves production efficiency. Compared with the current products on the market that are mainly plastic shells 1, it has higher strength and is safer. If the cell 22 experiences thermal runaway, it will not catch fire and cause damage. The innovatively designed low-voltage socket 25 integrates communication signal acquisition and charging and discharging interface. It adopts an internal sealed design. Compared with the traditional external plug-in, the plug-in is directly welded to the wire harness of the protection board 23. It does not require an adapter plug to transfer the wire harness, making the design safer and reducing the process assembly steps. The lithium-ion battery of this invention achieves standardized development, cost reduction, convenient after-sales service and reliable manufacturing and installation.

[0041] Example 2:

[0042] A lithium-ion battery welding machine is disclosed, which is used to weld the lithium-ion battery. The welding machine is used to weld the main shell 11 and the shell bottom 12. The welding machine includes a welding table 3 and a three-coordinate welding arm 4 disposed on the upper surface of the welding table 3. A welding head 41 is disposed on the three-coordinate welding arm 4. Insertion holes 31 are evenly disposed on the welding table 3. Adjacent insertion holes 31 are disposed close to each other. Insertion rods 5 are vertically inserted into the insertion holes 31. The upper end of the insertion rods 5 is close to the upper port of the main shell 11.

[0043] Before welding the main shell 11 and the shell bottom 12, the two openings of the main shell 11 are placed vertically through the upper surface of the welding table 3, ensuring that the main shell 11 spans as much as possible the gap between two adjacent insertion holes 31. Then, the insertion rods 5 are inserted into the corresponding insertion holes 31 on the inner and outer sides of the main shell 11. The number of insertion rods 5 can be selectively adjusted, and the insertion position can also be selectively varied to ensure the limiting effect between the insertion rods 5 and the inner and outer walls of the main shell 11, and to be applicable to welding main shells 11 of different specifications, thus expanding the welding range. After the insertion rods 5 complete the insertion into the corresponding insertion holes 31, the inner and outer sides of the main shell 11 are restricted by the corresponding insertion rods 5. The upper end of the insertion rod 5 does not exceed but approaches the upper end of the main shell 11 to ensure the limiting effect of the welding position. Next, the shell bottom 12 is placed at the port of the main shell 11, and the three-axis welding arm 4 begins to drive the welding head 41 to work. The three-axis welding arm 4 can operate along the x, y, and z axes. The welding head 41 is moved upwards to any point. The specific principle of the movement is existing technology and will not be elaborated further. The welding head 41 will weld along the welding gap between the port of the main shell 11 and the shell bottom 12. During the welding process, the insertion rod 5 restricts the position of the main shell 11 due to the restriction of the inner and outer walls of the main shell 11, thereby achieving the purpose of limiting the position. Under the restriction and support of the insertion rod 5, the inner and outer walls of the main shell 11 cannot deform or shift during the welding process, thus ensuring the stability of the weld between the main shell 11 and the shell bottom 12, thereby improving the weld quality between the main shell 11 and the shell bottom 12. In addition, the welding machine can be used to weld main shells 11 and shell bottom 12 of different specifications, with a wide welding range. After the main shell 11 and shell bottom 12 are removed after welding, the insertion rod 5 is not removed from the insertion hole 31. Then, a new main shell 11 is placed in the corresponding gap position of the insertion rod 5, and so on to achieve the welding of the main shell 11 and shell bottom 12.

[0044] Example 3:

[0045] The upper surface of the welding station 3 is provided with a guide hole 32; a guide rod 6 is slidably connected in the guide hole 32; a plurality of guide rods 6 are fixedly connected to a support plate 61 at their upper ends; the support plate 61 is provided with a support hole 62 running through it vertically; the position of the support hole 62 corresponds one-to-one with the insertion hole 31; the diameter of the support hole 62 is adapted to the diameter of the insertion hole 31; the guide rods 6 and the support plate 61 are provided with threaded holes 63 running through them vertically; a bolt 64 is threadedly connected in the threaded hole 63.

[0046] Before welding the main shell 11 and the shell bottom 12, the bolt 64 is turned in the threaded hole 63, which passes through the guide rod 6 and the support plate 61. When the bolt 64 is turned, the bolt 64 will move downward relative to the guide rod 6. The longer the lower end of the bolt 64 extends out of the threaded hole 63, the higher the lower limit position of the support plate 61. This makes the length of the insert 5 exposed above the support plate 61 shorter, thus meeting the welding requirements of some shorter main shells 11. The lower the lower limit position of the support plate 61, the longer the length of the insert rod 5 exposed above the support plate 61, thus satisfying the welding of some high main shells 11; after the bolt 64 is tightened and adjusted, the support plate 61 is lowered. Under the action of gravity, the support plate 61 will drive the guide rod 6 to slide along the guide hole 32. The guide rod 6 will drive the lower end of the bolt 64 to abut against the bottom of the guide hole 32, so that the guide rod 6 and the support plate 61 can not move further down. During the downward movement of the support plate 61, the support hole 62 and the insert rod 5 will slide. After the support plate 61 stops moving downwards, the length of the insert rods 5 protruding from above the support plate 61 stops. Then, the main shell 11 is placed in the placement gap formed by the corresponding insert rods 5. After the main shell 11 lands on the upper surface of the support plate 61, part of the insert rods 5 are located inside the main shell 11, and the other part of the insert rods 5 are located outside the main shell 11. The height of the main shell 11 is adapted to the height of the insert rods 5 protruding above the support plate 61. After the shell bottom 12 is placed and welded to the main shell 11, the support plate 61 is lifted upwards directly. The support plate 61 will then support the newly welded main shell. 11. To prevent the main shell 11 from overheating during welding and affecting its removal, during the upward movement of the support plate 61, the guide rod 6 will slide along the guide hole 32. The support hole 62 on the support plate 61 will scrape off the debris on the outer wall of the insert rod 5 to ensure the cleanliness of the insert rod 5, thereby avoiding affecting the limiting effect of the insert rod 5 on the main shell 11. In this embodiment, the placement position of the support plate 61 is changed by adjusting the bolt 64, thereby ensuring the welding effect of the welding machine on the main shell 11 while making the insert rod 5 applicable to main shells 11 of different heights, thus improving the welding range.

[0047] Example 4:

[0048] The inner wall of the insertion hole 31 is slidably sealed with an anti-blocking block 7; the anti-blocking block 7 is connected to the inner bottom wall of the insertion hole 31 by a first spring 71; the insertion hole 31 is provided with a first vent hole 33 extending downwards; the weight of the insertion rod 5 is greater than the elastic force of the first spring 71.

[0049] During the insertion of the plug 5 into the socket 31, the anti-blocking block 7 will be squeezed and moved downward. During the downward movement of the anti-blocking block 7, it will slide along the socket 31 and move downward. During the downward movement of the anti-blocking block 7, the gas in the socket 31 will be discharged along the first vent hole 33. The anti-blocking block 7 can overcome the first spring 71 to avoid the plug 5 during the insertion of the plug 5 into the socket 31. When the plug 5 is removed from the socket 31, the first spring 71 will drive the anti-blocking block 7 to move upward. The upper surface of the anti-blocking block 7 will eventually be flush with the upper surface of the welding station 3, thereby achieving the purpose of preventing the socket 31 from being blocked. The external gas will flow back into the socket 31 along the first vent hole 33.

[0050] Example 5:

[0051] The welding station 3 has a drive groove 34 inside; a drive plate 35 is slidably and sealed within the drive groove 34; the drive plate 35 divides the drive groove 34 into an upper cavity 341 and a lower cavity 342; a vertical groove 36 is provided through the drive groove 34 upwards; a vertical bar 8 is slidably connected up and down within the vertical groove 36; the lower end of the vertical bar 8 is fixedly connected to the drive plate 35; a clamping groove 51 is vertically provided on the outer wall of the insertion rod 5; a clamping bar 52 is slidably and sealed within the clamping groove 51; a first liquid hole 53 communicating with the bottom of the clamping groove 51 is provided on the lower part of the arc-shaped outer wall of the insertion rod 5; an annular groove 311 is provided on the inner wall of the insertion hole 31; the annular groove 311 communicates with the lower cavity 342 through a second liquid hole 312.

[0052] In this embodiment, the drive plate 35 and the bottom of the drive groove 34 are connected by a second spring 37; the upper end of the vertical bar 8 is connected to the vertical outer wall and is provided with an L-shaped groove 81; an L-shaped bar 82 is horizontally slidably connected in the L-shaped groove 81; the L-shaped bar 82 and the bottom of the L-shaped groove 81 are connected by a third spring 83; the inner wall of the vertical groove 36 is uniformly provided with slots 361; the lower end of the L-shaped bar 82 can be inserted into the slot 361; the lower end of the L-shaped bar 82 is inclined downward with a slope 84.

[0053] After the insert rod 5 is inserted into the socket 31, the anti-blocking block 7 will move close to the bottom wall of the socket 31 to avoid it. After the anti-blocking block 7 moves down to its limit position, the first liquid hole 53 on the insert rod 5 will communicate with the annular groove 311. A sealing ring (not shown in the figure) is embedded in the outer wall of the insert rod 5 near the opening of the socket 31. After all the insert rods 5 have been inserted into their corresponding sockets 31, the main shell 11 is placed in the gap between the corresponding insert rods 5. Note that the clamping groove 51 on the insert rod 5 needs to face the main shell 11 to ensure the clamping requirements of the main shell 11 of different thicknesses. In order to further achieve the clamping of the main shell 11, the vertical bar 8 is controlled to move down. During the downward movement of the vertical bar 8, it will slide along the vertical groove 36. A gap is formed between the vertical groove 36 and the vertical bar 8 to allow airflow. During the downward movement of the vertical bar 8, it will drive the drive plate 35 to move down. During the downward movement of the drive plate 35, it will squeeze the lower cavity 342. The liquid in the lower cavity 342 will flow along the first liquid hole 53. The liquid flows from the two liquid holes 312 into the annular groove 311, then through the annular groove 311 into the first liquid hole 53, and finally into the bottom of the clamping groove 51. The liquid medium pushes the clamping strips 52 in the clamping groove 51 to move outward under pressure. The clamping strips 52 abut against the main shell 11. With the clamping strips 52 pressed against the corresponding positions on the inner and outer sides of the main shell 11, the main shell 11 is clamped while achieving a balance of internal and external clamping forces. The clamping strips 52 are pushed by the liquid medium in the lower cavity 342, so the force of the clamping strips 52 against the main shell 11 is the same, avoiding deformation of the main shell 11 during clamping. The clamping strips 52 allow main shells 11 of different thicknesses to be clamped, improving the clamping range and applicability of the main shell 11. The distance that the drive plate 35 moves downward in the drive groove 34 is controllable, so that clamping can be completed by pushing any number of clamping strips 52, making it widely applicable.Furthermore, as the vertical bar 8 moves downward along the vertical groove 36, it will cause the L-shaped bar 82 to move downward synchronously. During the downward movement of the lower end of the L-shaped bar 82, it is squeezed by the corresponding slot 361, overcoming the third spring 83 and sliding along the L-shaped groove 81. The lower end of the L-shaped bar 82 will retract into the L-shaped groove 81 until it aligns with the corresponding slot 361. Then, the third spring 83 pushes the lower end of the L-shaped bar 82 into the slot 361. During the downward movement of the drive plate 35, it needs to overcome the elastic force of the second spring 37. The elastic force of the second spring 37 will react to the drive plate 35 and the vertical bar 8. However, because the lower end of the L-shaped bar 82 is engaged in the slot 361, the vertical bar 8 cannot move upward, thus locking the vertical bar 8 within the vertical groove 36. After welding is completed, the upper end of the L-shaped bar 82 is moved to overcome the elastic force of the third spring 83. After being moved, the L-shaped bar 82 will slide along the L-shaped groove 81. One end will move out from the corresponding slot 361, unlocking the vertical bar 8. The second spring 37 will push the drive plate 35 upward, and the drive plate 35 will drive the vertical bar 8 to slide upward along the vertical groove 36. The space in the lower cavity 342 will increase, forming a negative pressure. The medium in the clamping groove 51 will flow back into the lower cavity 342 along the first liquid hole 53, the annular groove 311 and the second liquid hole 312. The clamping bar 52 will retract into the clamping groove 51, releasing the clamping of the main shell 11. In this embodiment, the extensionable clamping bar 52 is provided on the outer wall of the insert rod 5, thereby further clamping the main shell 11 during the welding process between the main shell 11 and the shell bottom 12, thereby avoiding welding deformation during the welding process and improving the welding quality. In this embodiment, the anti-blocking block 7 in the insertion hole 31 that is not inserted into the insert rod 5 will block the corresponding annular groove 311 to avoid leakage. In this embodiment, the upper end of the L-shaped bar 82 protrudes from the upper end of the L-shaped groove 81.

[0054] Example 6: A U-shaped groove 54 is provided at the lower position of the arc-shaped outer wall of the insert rod 5; a U-shaped strip 55 is slidably and sealed inside the U-shaped groove 54; the U-shaped strip 55 is connected to the bottom of the U-shaped groove 54 by a fourth spring 56; the lower end of the U-shaped strip 55 is set at the same height as the lower end of the first liquid hole 53; the lower end of the U-shaped strip 55 can be inserted into the annular groove 311.

[0055] In this embodiment, the bottom of the annular groove 311 is uniformly provided with anti-rotation grooves 313; the lower end of the U-shaped strip 55 can be inserted into the anti-rotation groove 313.

[0056] Before inserting the insertion rod 5 into the insertion hole 31, press down on the upper end of the U-shaped strip 55. Initially, both the upper and lower ends of the U-shaped strip 55 protrude from the U-shaped groove 54. Therefore, after the upper end of the U-shaped strip 55 is pressed down, it overcomes the fourth spring 56 and slides along the U-shaped groove 54. The lower end of the U-shaped strip 55 will be compressed back into the U-shaped groove 54 as the upper end of the U-shaped strip 55 is pressed down. Thus, the insertion rod 5 is smoothly inserted into the insertion hole 31 without obstruction. After the insertion of the insertion rod 5 is completed, release the upper end of the U-shaped strip 55. The fourth spring 56 pushes the U-shaped strip 55 to slide outward along the U-shaped groove 54, and the lower end of the U-shaped strip 55 will be locked into the annular groove 311, achieving axial locking of the insertion rod 5. This makes the insertion of the insertion rod 5 into the insertion hole 31 more stable and prevents the insertion rod 5 from being damaged during the removal and placement of the main shell 11. The insertion rod 5 is moved out of the socket 31, making the welding process more stable. When it is necessary to remove the insertion rod 5 from the socket 31, simply press the upper end of the U-shaped strip 55 again to move the lower end out of the annular groove 311 and retract it into the U-shaped groove 54, thereby unlocking the insertion rod 5. Then, the insertion rod 5 can be pulled out directly. Furthermore, anti-rotation grooves 313 are evenly arranged in the annular groove 311. Before the insertion rod 5 is inserted into the socket 31, the direction of the clamping groove 51 is adjusted. After the insertion rod 5 is inserted into the socket 31, the lower end of the U-shaped strip 55 will enter the anti-rotation groove 313 after entering the annular groove 311, thereby preventing the clamping direction of the clamping strip 52 from changing during the clamping of the main shell 11, thus making the clamping more stable. Similarly, pressing the upper end of the U-shaped strip 55 can unlock the insertion rod 5.

[0057] Example 7: The clamping strip 52 is composed of multiple stacked strips 521; the upper and lower strips 521 are slidably sealed together, and the strips 521 are connected to the bottom of the clamping groove 51 by a limiting rope 522.

[0058] As the liquid medium flows into the clamping groove 51 along the first liquid hole 53, the clamping bar 52 is composed of multiple stacked strips 521, allowing each strip 521 to extend independently and abut against the inner or outer wall of the main shell 11. This allows for the clamping of irregularly shaped main shells 11, such as those with non-vertical shell walls (inclined), those with reinforcing ribs on the inner wall, or other irregular shapes. The clamping of the inner and outer walls has a wider range of applications. The limiting rope 522 plays a role in preventing the strips 521 in the clamping bar 52 from falling off. The stacked strips 521 will also cross the bearing plate 61. The strips 521 corresponding to the bearing plate 61 will not extend out of the clamping groove 51, but the strips 521 above and below the bearing plate 61 will move out and limit the bearing plate 61, thereby making the bearing height of the bearing plate 61 more stable. After the clamping bar 52 retracts into the clamping groove 51, it adapts to the arc-shaped outer wall of the insert rod 5.

[0059] In the description of this invention, it should be noted that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the appendix. Figure 1 The orientations or positional relationships shown are for the convenience of describing the present invention and simplifying the description only, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting the scope of protection of the present invention. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description and should not be construed as indicating or implying relative importance.

[0060] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A lithium-ion battery, comprising a casing and a battery module; characterized in that: The battery module includes two brackets and multiple battery cells inserted between the two brackets; the two brackets are symmetrically arranged; a protection plate is located on the side of the battery cell; the protection plate is bonded to the two brackets by structural adhesive; aluminum bars are welded to the two brackets on opposite sides; the aluminum bars are in contact with the corresponding ends of the battery cells; the housing includes a main shell with two ports, a bottom shell, and a top shell; the main shell is welded to the bottom shell; the low-voltage socket in the battery module is installed on the main shell.

2. A lithium-ion battery welding machine, used for welding the lithium-ion battery according to claim 1, characterized in that: The welding machine is used to weld the main shell and the shell bottom; the welding machine includes a welding table and a three-coordinate welding arm set on the upper surface of the welding table; the three-coordinate welding arm is provided with a welding head; the welding table is uniformly provided with insertion holes; adjacent insertion holes are arranged close to each other; a plug is vertically inserted into the insertion hole; the upper end of the plug is close to the upper port of the main shell.

3. A lithium-ion battery welding machine according to claim 2, characterized in that: The welding platform has guide holes on its upper surface; guide rods are slidably connected in the guide holes; a bearing plate is fixedly connected to the upper end of a plurality of guide rods; bearing holes are provided through the top and bottom of the bearing plate; the positions of the bearing holes correspond one-to-one with the insertion holes; the diameter of the bearing holes is adapted to the diameter of the insertion holes; threaded holes are provided through the top and bottom of the guide rods and the bearing plate; bolts are threadedly connected in the threaded holes.

4. A lithium-ion battery welding machine according to claim 2, characterized in that: The inner wall of the insertion hole is slidably sealed with an anti-blocking block; the anti-blocking block is connected to the bottom wall of the insertion hole by a first spring; the insertion hole is provided with a first vent hole facing downwards; the weight of the insertion rod is greater than the elastic force of the first spring.

5. A lithium-ion battery welding machine according to claim 4, characterized in that: The welding station has a drive groove inside; a drive plate is slidably and sealed within the drive groove; the drive plate divides the drive groove into an upper cavity and a lower cavity; a vertical groove is provided through the drive groove facing upwards; a vertical bar is slidably connected to the vertical groove; the lower end of the vertical bar is fixedly connected to the drive plate; a clamping groove is vertically provided on the outer wall of the insertion rod; a clamping bar is slidably and sealed within the clamping groove; a first liquid hole communicating with the bottom of the clamping groove is provided at the lower position of the arc-shaped outer wall of the insertion rod; an annular groove is provided on the inner wall of the insertion hole; the annular groove communicates with the lower cavity through a second liquid hole.

6. A lithium-ion battery welding machine according to claim 5, characterized in that: The drive plate is connected to the bottom of the drive groove by a second spring; the upper end of the vertical bar is connected to the vertical outer wall and has an L-shaped groove; the L-shaped bar is horizontally slidably connected in the L-shaped groove; the L-shaped bar and the bottom of the L-shaped groove are connected by a third spring; the inner wall of the vertical groove is evenly provided with slots; the lower end of the L-shaped bar can be inserted into the slots; the lower end of the L-shaped bar is inclined downwards with a slope.

7. A lithium-ion battery welding machine according to claim 5, characterized in that: A U-shaped groove is provided on the lower part of the arc-shaped outer wall of the insert rod; a U-shaped strip is slidably and sealed inside the U-shaped groove; the U-shaped strip is connected to the bottom of the U-shaped groove by a fourth spring; the lower end of the U-shaped strip is set at the same height as the lower end of the first liquid hole; the lower end of the U-shaped strip can be inserted into the annular groove.

8. A lithium-ion battery welding machine according to claim 7, characterized in that: The bottom of the annular groove is uniformly provided with anti-rotation grooves; the lower end of the U-shaped strip can be inserted into the anti-rotation groove.

9. A lithium-ion battery welding machine according to claim 5, characterized in that: The clamping bar is composed of multiple stacked strips; the upper and lower strips are slidably sealed together, and the strips are connected to the bottom of the clamping groove by a limiting rope.

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