Battery cell tab pre-shaping device and battery cell winding machine and motor tab welding machine using same

Abstract

The utility model provides a battery cell tab pre-shaping device and a battery cell winding machine and a motor tab welding machine using the same, the battery cell tab pre-shaping device comprises a pre-shaping mechanism, and the pre-shaping mechanism comprises a pre-shaping chuck, a first driving mechanism and a rotating mechanism; the pre-shaping chuck comprises a first pressing block and a second pressing block which are oppositely arranged, the first driving mechanism can control the first pressing block and the second pressing block to be close to or away from each other, then two or more tabs can be combined together, the situation that the tabs are staggered or bent in the follow-up welding process can be reduced, and the welding quality of the tabs is improved. Therefore, the tab welding qualification rate is improved, and the quality of the lithium battery is improved; and the rotating mechanism can control the rotation of the pre-shaping chuck, so that the opening and closing directions of the first pressing block and the second pressing block can be changed, when the position of the tab in the battery cell is changed, the pre-shaping device also can be applied, and the applicability of the pre-shaping device for the tab of the battery cell is further enhanced.

Description

Technical Field

[0001] The utility model relates to the field of lithium battery production equipment, in particular to a battery cell tab pre-shaping device and a battery cell winding machine and a motor tab welding machine using the device. Background Art

[0002] Lithium batteries have the advantages of high energy, long life, small size, light weight, strong adaptability to high and low temperatures, and green environmental protection. With excellent performance, they are widely used in high-demand and fast-growing fields such as new energy vehicles and portable consumer electronics, and are gradually being applied to other product fields, with broad market prospects. Cylindrical lithium batteries are a common type of lithium-ion battery with the advantages of high energy density and long life, and are the preferred power source for many portable electronic devices and power tools.

[0003] Battery cells are one of the necessary raw materials for lithium battery production, and battery cells are generally provided with tabs to achieve electrical connection between the battery cells and the outside. At present, the tab structures of cylindrical lithium batteries are more common, such as single-pole tabs, bipolar tabs or multi-pole tabs. Compared with these tab structures, if a single-pole tab structure is adopted, the charging and discharging of current will cause excessive internal resistance, which will easily lead to various safety problems. Batteries with bipolar tabs or multi-pole tabs have better charging and discharging performance and safety performance. Therefore, cylindrical lithium batteries now gradually adopt bipolar tabs or even multi-pole tabs.

[0004] In the current production process of bipolar or multi-polar cylindrical lithium batteries, after the battery cell is wound, it is generally necessary to weld the bipolar or multi-polar ears of the battery cell, that is, to weld two or more ears together, and to ensure that the relative positions of the two or more ears cannot be offset or bent, otherwise they will be defective. In the current welding process, when two or more positive pole ears are close to and overlapped, the ears are often misaligned or bent, which affects the welding effect of the ears, resulting in a low qualified rate of the battery cell, and further affects the quality of the cylindrical lithium battery. Utility Model Content

[0005] The utility model provides a battery cell tab pre-shaping device, which can pre-shape the bipolar tabs or multipolar tabs of the battery cell before welding, thereby improving the welding effect and quality. The specific technical solution is as follows:

[0006] A battery cell tab pre-shaping device comprises a pre-shaping mechanism, wherein the pre-shaping mechanism comprises a pre-shaping chuck, a first driving mechanism and a rotating mechanism; the pre-shaping chuck comprises a first pressing block and a second pressing block arranged opposite to each other; the first driving mechanism can control the first pressing block and the second pressing block to move closer to or farther away from each other; the rotating mechanism can control the first pressing block and the second pressing block to rotate relative to each other.

[0007] Furthermore, one of the first pressing block and the second pressing block is provided with a groove on its inner side, and the other one is provided with a corresponding protrusion on its inner side.

[0008] Furthermore, the pre-shaping mechanism is also provided with a second driving mechanism, and the second driving mechanism can control the pre-shaping clamp to approach or move away from the battery core.

[0009] Furthermore, it also includes a first positioning mechanism that can position the battery cell at the pre-shaping station.

[0010] Furthermore, it also includes a second positioning mechanism which can pre-position the battery cell before the pre-shaping station.

[0011] Furthermore, the first positioning mechanism and / or the second positioning mechanism comprises a positioning rod and a positioning cylinder, and the positioning cylinder can control the positioning rod to be close to or away from the battery cell.

[0012] Furthermore, it also includes a pressing mechanism that can press the battery core at the pre-shaping station.

[0013] Furthermore, the clamping mechanism includes a clamping plate and a clamping cylinder, and the clamping cylinder can control the clamping plate to approach or move away from the battery cell.

[0014] A battery cell winding machine comprises a battery cell winding mechanism, wherein the battery cell tab pre-shaping device described in any one of the above items is further arranged behind the battery cell winding mechanism.

[0015] A motor pole lug welding machine comprises a welding mechanism, in front of which a battery cell pole lug pre-shaping device as described in any one of the above items is arranged.

[0016] The utility model provides a battery cell tab pre-shaping device, comprising a pre-shaping mechanism, wherein the pre-shaping mechanism comprises a pre-shaping chuck, a first driving mechanism and a rotating mechanism; the pre-shaping chuck comprises a first pressing block and a second pressing block arranged opposite to each other, and the first driving mechanism can control the first pressing block and the second pressing block to approach or move away from each other, thereby controlling the opening and clamping of the pre-shaping chuck, thereby realizing the combination of two or even more tabs, and reducing the occurrence of tab misalignment or tab bending in the subsequent welding process, thereby improving the tab welding pass rate and improving the quality of lithium batteries; the rotating mechanism can control the rotation of the pre-shaping chuck, so that the opening and closing directions of the first pressing block and the second pressing block can be changed, and when the tab position in the battery cell changes, it can also be applied in the same way, further enhancing the applicability of the battery cell tab pre-shaping device. In addition, by setting up a first positioning mechanism and a second positioning mechanism, the battery cell can be positioned to improve the accuracy of the pre-shaping position of the tab and improve the pre-shaping effect; by setting up a clamping mechanism, the battery cell can be prevented from shaking and shifting during the pre-shaping process of the tab, thereby preventing the pre-shaping effect, the tab from being misplaced, or the tab from being bent, and the pre-shaping effect can be further improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of the position and status of the battery cell tab before pre-shaping.

[0018] Figure 2 This is a schematic diagram of the position and status of the battery cell tab after pre-shaping.

[0019] Figure 3 This is a schematic structural diagram of the battery cell tab pre-shaping device provided by the utility model.

[0020] Figure 4 This is a schematic diagram of the pre-shaping mechanism structure provided by the utility model.

[0021] Figure 5 The working state of the pre-shaping mechanism provided by the utility model is shown in FIG. Figure 1 (Before pre-shaping).

[0022] Figure 6 The working state of the pre-shaping mechanism provided by the utility model is shown in FIG. Figure 2 (During pre-shaping).

[0023] Figure 7 This is a schematic diagram of the structure of the first positioning mechanism / second positioning mechanism provided by the utility model.

[0024] Figure 8 This is a schematic diagram of the structure of the clamping mechanism provided by the utility model.

[0025] The figures are marked as follows: 1 is a battery cell, 11 is a first pole ear, 12 is a second pole ear, 2 is a pre-shaping mechanism, 21 is a pre-shaping chuck, 211 is a first pressure block, 212 is a second pressure block, 22 is a first driving mechanism, 23 is a rotating mechanism, 24 is a second driving mechanism, 3 is a first positioning mechanism, 31 is a positioning rod, 32 is a positioning cylinder, 4 is a second positioning mechanism, 5 is a clamping mechanism, 51 is a clamping plate, and 52 is a clamping cylinder. DETAILED DESCRIPTION

[0026] The specific embodiments of the present invention are further described below in conjunction with the accompanying drawings. For the convenience of description, the directions or positional relationships indicated by the terms "front", "rear", "front", "reverse", "left", "right", "top", "bottom", "up", "down", "inside", "outside", "inside", etc. in the present invention are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention and the actual direction of the product or device during production, use, sales, etc. In addition, the terms "first", "second", "third", "fourth", "fifth", etc. are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Furthermore, in the embodiments of the present invention, unless otherwise clearly specified and limited, the terms "installed", "set", "connected", "fixed", "composed", etc. should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral body; it can be directly connected or indirectly connected through an intermediate medium. For those skilled in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0027] The utility model provides a battery cell tab pre-shaping device, which can be used to pre-shape the bipolar tabs or multipolar tabs of a battery cell 1 before tab welding, so that the bipolar tabs or multipolar tabs are joined together to improve the welding effect and quality. Figure 1 Shown is a bipolar lug structure battery cell 1 (the application object in this embodiment takes the bipolar lug structure as an example, but the battery cell lug pre-shaping device can also be used for the pre-shaping of other multi-lug structure battery cells 1 before welding), including a first lug 11 and a second lug 12, and the first lug 11 and the second lug 12 are in a separated state.

[0028] like Figure 3 As shown, the battery cell tab pre-shaping device includes a pre-shaping mechanism 2, such as Figure 4As shown, the pre-shaping mechanism 2 includes a pre-shaping chuck 21, a first driving mechanism 22 and a rotating mechanism 23; the pre-shaping chuck 21 includes a first pressing block 211 and a second pressing block 212, the first pressing block 211 and the second pressing block 212 are arranged opposite to each other, and a space for accommodating the first pole ear 11 and the second pole ear 12 is formed in the middle; the first driving mechanism 22 can control the first pressing block 211 and the second pressing block 212 to move closer to or farther from each other; Figure 5 FIG. 2 is a schematic diagram of the working state of the pre-shaping mechanism 2 before pre-shaping, in which the pre-shaping chuck 21 is in an open state, that is, the first pressing block 211 and the second pressing block 212 are separated from each other, and a space for accommodating the first pole lug 11 and the second pole lug 12 is formed in the middle; Figure 6 The figure is a schematic diagram of the working state of the pre-shaping mechanism 2 during pre-shaping. At this time, the pre-shaping chuck 21 is in a clamped state, that is, the first pressing block 211 and the second pressing block 212 are close to each other and press the first pole ear 11 and the second pole ear 12 located between them. Under the action of the first pressing block 211 and the second pressing block 212, the first pole ear 11 and / or the second pole ear 12 are deformed, so that the first pole ear 11 and the second pole ear 12 are combined together. Figure 2 In addition, the rotating mechanism 23 can control the first pressing block 211 and the second pressing block 212 to rotate relative to each other, so as to change the opening and closing directions of the first pressing block 211 and the second pressing block 212 .

[0029] The battery cell tab pre-shaping device with the above structure adopts a first pressing block 211 and a second pressing block 212 that are relatively arranged to form a pre-shaping chuck 21. The opening and clamping of the pre-shaping chuck 21 are controlled by a first driving mechanism 22, so that two or more tabs can be joined together, which can reduce the occurrence of tab misalignment or tab bending in the subsequent welding process, thereby improving the tab welding pass rate and the quality of lithium batteries; at the same time, a rotating mechanism 23 is provided to control the rotation of the pre-shaping chuck 21, so that the opening and closing directions of the first pressing block 211 and the second pressing block 212 can be changed. When the tab position in the battery cell 1 changes, it can also be applied in the same way, further enhancing the applicability of the battery cell tab pre-shaping device.

[0030] In some embodiments, a groove is provided on the inner side of the first pressing block 211 facing the first pole ear 11, and a corresponding protrusion is provided on the inner side of the second pressing block 212 facing the second pole ear 12, or a groove is provided on the inner side of the second pressing block 212 facing the second pole ear 12, and a corresponding protrusion is provided on the inner side of the first pressing block 211 facing the first pole ear 11. The groove and the protrusion cooperate to make the overlap and flatness of the pole ears better during pre-shaping, thereby improving the quality of the pole ear welding. For example, the inner side of the first pressing block 211 facing the first pole ear 11 is an arc-shaped groove, and the inner side of the second pressing block 212 facing the second pole ear 12 is a corresponding arc-shaped protrusion, or the inner side of the second pressing block 212 facing the second pole ear 12 is an arc-shaped groove, and the inner side of the first pressing block 211 facing the first pole ear 11 is a corresponding arc-shaped protrusion; in addition, the inner side of the first pressing block 211 facing the first pole ear 11 may also be a square or a trapezoidal groove with a wide outer side and a narrow inner side, and the inner side of the second pressing block 212 facing the second pole ear 12 may be a corresponding square or a protrusion with a narrow outer side and a wide inner side; or conversely, the inner side of the second pressing block 212 facing the second pole ear 12 is a square or a trapezoidal groove with a wide outer side and a narrow inner side, and the inner side of the first pressing block 211 facing the first pole ear 11 may be a corresponding square or a protrusion with a narrow outer side and a wide inner side.

[0031] In some embodiments, the pre-shaping mechanism 2 is further provided with a second driving mechanism 24, which can control the pre-shaping chuck 21 to be close to or away from the battery cell 1. For example, when pre-shaping is required, the pre-shaping chuck 21 is close to the battery cell 1, and before or after pre-shaping, the pre-shaping chuck 21 is away from the battery cell 1, so as not to hinder the transmission of the battery cell 1 on the assembly line, thereby further improving production efficiency.

[0032] In some embodiments, the battery cell tab pre-shaping device also includes a first positioning mechanism 3, which defines the position of the battery cell 1 during pre-shaping as a pre-shaping station. The first positioning mechanism 3 can position the battery cell 1 at the pre-shaping station to improve the accuracy of the tab pre-shaping position and enhance the pre-shaping effect.

[0033] In some embodiments, Figure 7 As shown, the first positioning mechanism 3 includes a positioning rod 31 and a positioning cylinder 32 . The positioning rod 31 is used to position the battery cell 1 at the pre-shaping station, and the positioning cylinder 32 can control the positioning rod 31 to be close to or away from the battery cell 1 .

[0034] In some embodiments, the battery cell tab pre-shaping device is further provided with a second positioning mechanism 4 before the pre-shaping station. The second positioning mechanism 4 can pre-position the battery cell 1 at the previous station of the pre-shaping station, which can further improve the accuracy of the tab pre-shaping position and further enhance the pre-shaping effect.

[0035] In some embodiments, the structure of the second positioning mechanism 4 is the same as that of the first positioning mechanism 3, including a positioning rod 31 and a positioning cylinder 32, wherein the positioning rod 31 is used to position the battery cell 1 at the previous station of the pre-shaping station, and the positioning cylinder 32 can control the positioning rod 31 to be close to or away from the battery cell 1.

[0036] In some embodiments, the battery cell tab pre-shaping device also includes a clamping mechanism 5, which can clamp the battery cell 1 at the pre-shaping station to fix it, thereby preventing the battery cell from shaking and shifting during the battery cell tab pre-shaping process, thereby affecting the pre-shaping effect, causing the tab to be misplaced or bent, and further improving the pre-shaping effect.

[0037] In some embodiments, Figure 8 As shown, the clamping mechanism 5 includes a clamping plate 51 and a clamping cylinder 52. The clamping cylinder 52 can control the clamping plate 51 to approach or move away from the battery cell 1. When the battery cell 1 reaches the pre-shaping station and is positioned by the first positioning mechanism 3, the clamping cylinder 52 controls the clamping plate 51 to gradually approach the battery cell 1 and clamp the battery cell 1 to make it fixed. At this time, the pre-shaping is performed again by the pre-shaping mechanism 2.

[0038] The utility model also provides a battery cell winding machine, which, in addition to the battery cell winding mechanism, also includes any one of the above-mentioned battery cell pole ear pre-shaping devices, wherein the battery cell pole ear pre-shaping device is located behind the battery cell winding mechanism. When the battery cell winding mechanism completes the battery cell winding, the battery cell pole ear pre-shaping device can be used to pre-shape the bipolar ears or multi-polar ears of the wound battery cell, thereby improving the effect and quality of subsequent welding.

[0039] The utility model also provides a motor pole lug welding machine, which, in addition to the welding mechanism, also includes any one of the above-mentioned battery cell pole lug pre-shaping devices, wherein the battery cell pole lug pre-shaping device is located before the battery cell winding mechanism, and before the welding mechanism welds, the bipolar lugs or multi-polar lugs of the battery cell to be welded are pre-shaped by the battery cell pole lug pre-shaping device, thereby improving the effect and quality of subsequent welding.

[0040] The above embodiments are only preferred embodiments of the present invention and are not intended to limit the scope of implementation of the present invention. All equivalent changes made based on the shape, structure and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A battery cell tab pre-shaping device, characterized in that: The invention comprises a pre-shaping mechanism (2), wherein the pre-shaping mechanism (2) comprises a pre-shaping chuck (21), a first driving mechanism (22) and a rotating mechanism (23); the pre-shaping chuck (21) comprises a first pressing block (211) and a second pressing block (212) which are arranged opposite to each other; the first driving mechanism (22) can control the first pressing block (211) and the second pressing block (212) to move closer to or farther from each other; and the rotating mechanism (23) can control the first pressing block (211) and the second pressing block (212) to rotate relative to each other.

2. The battery cell tab pre-shaping device according to claim 1, characterized in that: One of the first pressing block (211) and the second pressing block (212) is provided with a groove on its inner side, and the other is provided with a corresponding protrusion on its inner side.

3. The battery cell tab pre-shaping device according to claim 1, characterized in that: The pre-shaping mechanism (2) is further provided with a second driving mechanism (24), and the second driving mechanism (24) can control the pre-shaping clamp (21) to approach or move away from the battery core (1).

4. The battery cell tab pre-shaping device according to claim 1, characterized in that: It also includes a first positioning mechanism (3) capable of positioning the battery core (1) at a pre-shaping station.

5. The battery cell tab pre-shaping device according to claim 4, characterized in that: It also comprises a second positioning mechanism (4) which can pre-position the battery core (1) before the pre-shaping station.

6. The battery cell tab pre-shaping device according to claim 5, characterized in that: The first positioning mechanism (3) and / or the second positioning mechanism (4) comprises a positioning rod (31) and a positioning cylinder (32), and the positioning cylinder (32) can control the positioning rod (31) to approach or move away from the battery cell (1).

7. The battery cell tab pre-shaping device according to claim 1, characterized in that: It also includes a pressing mechanism (5) capable of pressing the battery core (1) at a pre-shaping station.

8. The battery cell tab pre-shaping device according to claim 7, characterized in that: The pressing mechanism (5) comprises a pressing plate (51) and a pressing cylinder (52), and the pressing cylinder (52) can control the pressing plate (51) to move closer to or farther away from the battery core (1).

9. A battery cell winding machine, comprising a battery cell winding mechanism, characterized in that: The battery cell winding mechanism is further provided with a battery cell tab pre-shaping device as described in any one of claims 1 to 8.

10. A motor lug welding machine, comprising a welding mechanism, characterized in that: A battery cell tab pre-shaping device as described in any one of claims 1 to 8 is also arranged in front of the welding mechanism.

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