Laser welding device and welding side pressure mechanism for battery shell

Abstract

The present invention relates to the field of battery technology and relates to a welding side pressure mechanism for a battery shell, which includes a base for sleeved battery shells, and is characterized in that it also includes at least two gear assemblies installed on both sides of the base, a driving assembly installed between the gear assemblies on both sides and driving the gear assembly to rotate, and a side pressure assembly installed between the gear assemblies on both sides and away from the driving assembly, the side pressure assembly can side-press the welding point on the battery shell and drive the battery shell to move on the base, the base and the side pressure assembly level and adjust the outer surface and inner surface of the battery shell, avoiding uneven welding caused by thermal deformation during welding, and then the battery shell is fitted with the side pressure assembly to ensure the flush effect of the welding point, the third roller group and the rollers in the first roller group are both provided with welding seams to divide the rollers into two parts, thereby improving the stability of the product during transportation.

Description

Technical Field

[0001] The present invention relates to the technical field of batteries, and in particular to a laser welding device and a welding side pressure mechanism for a battery shell. Background Art

[0002] With the booming development of new energy vehicles, demand for blade batteries has surged as a power source for these vehicles, driving a corresponding increase in demand for power batteries. Blade batteries are known for their long, narrow appearance. Because blade battery casings are difficult to stretch through a stretching process, they are typically constructed by bending and welding the sheet metal.

[0003] At present, in order to improve the efficiency of welding blade battery shells, the blade battery shells are usually bent and welded. However, since the welding seam of the blade battery shell is very long, thermal deformation during the welding process is unavoidable. The direct consequence of thermal deformation is an uneven welding seam and deformation of the blade battery shell, resulting in poor welding. At the same time, the long welding seam requires the welding stroke of the welder to be long enough. Ordinary welders cannot meet the requirements of blade battery shells, and it is also impossible to accurately cool the weld in time. Summary of the Invention

[0004] In order to address the above-mentioned problems in the prior art, the present invention provides a battery assembly and a heat dissipation assembly thereof to solve the problem of uneven heat dissipation in the prior art.

[0005] In order to achieve the above-mentioned object of the invention, the technical solution adopted by the present invention is as follows:

[0006] A welding side pressure mechanism for a battery shell includes a base for sleeve-mounting the battery shell, at least two gear assemblies mounted on both sides of the base, a drive assembly mounted between the gear assemblies on both sides and driving the gear assemblies to rotate, and a side pressure assembly mounted between the gear assemblies on both sides and away from the drive assembly, wherein the side pressure assembly can side-press the welding point on the battery shell and drive the battery shell to move on the base.

[0007] The battery housing includes a first side plate and a second side plate that are folded and bonded together, and a welding point between the first side plate and the second side plate.

[0008] The base includes a support seat for supporting the battery housing, a bottom plate provided at the bottom of the base, and a pad between the support seat and the bottom plate, and the support seat is suspended above the pad.

[0009] Among them, the groove of the support seat includes a first roller group and a second roller group, the first roller group and the second roller group are both composed of multiple rollers, and the rollers in the first roller group are provided with welding seams to divide the rollers into two parts.

[0010] The gear assembly includes a gear plate, a cover plate covering the gear plate, a plurality of gears arranged on the gear plate and cooperating with each other, and a gear shaft arranged corresponding to the gears.

[0011] Among them, the driving assembly includes a driving motor, a driving shaft installed on the driving motor and a driving gear sleeved on the driving shaft. The driving motor is installed close to the outside of the gear plate, and the driving shaft passes through the gear assemblies on both sides and is connected to the driving motor.

[0012] Among them, the side pressure device is mounted above the support seat, and cooperates with the gear assembly through an elastic member and is close to the battery casing, including a third roller group and a fourth roller group arranged corresponding to the first roller group and the second roller group, a side pressure seat on which the third roller group and the fourth roller group are installed, and a plurality of side rollers installed on the inner side of the side pressure seat.

[0013] The side rollers are movably mounted on the side pressure seat via the side pressure shafts, and the third roller group and the fourth roller group are provided with roller shafts that are exposed outside the side pressure seat.

[0014] Wherein, the side pressure seat is loosely fitted on both sides of the support seat through elastic parts.

[0015] In order to achieve the above-mentioned object of the invention, the present invention also adopts the following technical solutions:

[0016] A laser welding device includes the above-mentioned welding side pressure mechanism of the battery shell and a laser head located above the welding side pressure mechanism of the battery shell. When welding the battery shell provided with welding points, the welding points of the battery shell are welded in sequence by the laser head by moving on the welding side pressure mechanism. After welding, the welding points are flattened by the side pressure mechanism.

[0017] The beneficial effects of the laser welding device and the welding side pressure mechanism of the battery shell of the present invention are as follows: the present invention uses the first roller group and the second roller group of the support seat and the third roller group and the fourth roller group of the side pressure assembly to level and adjust the side pressure of the outer surface and the inner surface of the welding point of the battery shell after welding, thereby avoiding the poor welding effect caused by uneven welding due to thermal deformation during welding, and improving the product yield. Then, the elastic part provided on the outside of the side pressure assembly is used to make the side pressure assembly fit the battery shell during welding to ensure the flush effect of the welding point. The rollers in the third roller group and the first roller group are both provided with a welding seam to divide the rollers into two parts. The welding seam prevents the generation of welding sand when welding the battery shell and hinders the transportation of the battery shell, thereby improving the stability of the product during transportation. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic structural diagram of an embodiment of a battery housing of the present invention;

[0019] Figure 2 This is a structural schematic diagram of a welding side pressure mechanism for a battery shell according to the present invention;

[0020] Figure 3 This is an exploded structural diagram of a welding side pressure mechanism for a battery housing according to the present invention;

[0021] Figure 4 for Figure 2 Schematic diagram of the structure of the middle base;

[0022] Figure 5 for Figure 2 Schematic diagram of the structure of the gear assembly;

[0023] Figure 6 for Figure 2 Schematic diagram of the structure of the middle drive component;

[0024] Figure 7 for Figure 2 A schematic diagram of the structure of the side pressure assembly;

[0025] Figure 8 For the Figure 2 Schematic diagram of the cross-sectional structure of line AA.

[0026] Figure ID:

[0027] 1-battery housing; 2-base; 3-gear assembly; 4-drive assembly; 5-side pressure assembly; 11-first side panel; 12-second side panel; 13-welding point; 21-support seat; 22-bottom plate; 23-pad; 24-first roller group; 25-second roller group; 31-gear plate; 32-cover plate; 33-gear; 34-gear shaft; 331-upper gear; 332-lower gear; 41-drive motor; 42-drive shaft; 43-drive gear; 51-third roller group; 52-fourth roller group; 53-side pressure seat; 54-side roller; 55-side pressure shaft; 56-roller shaft; 211-cooling air channel; 6-laser head; 7-elastic member; 2111-cooling air inlet; 2112-cooling air outlet DETAILED DESCRIPTION

[0028] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It will be understood that the specific embodiments described herein are only used to explain the present invention, not to limit the present invention. It should also be noted that, for ease of description, the accompanying drawings only show part of the structure related to the present invention, not all of it. In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrated connection; 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 connection of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0029] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Furthermore, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0030] In the description of the present invention, the terms "upper," "lower," "right," and other orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely for ease of description and simplified operation. They are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation, and therefore should not be construed as limitations on the present invention. Furthermore, the terms "first" and "second" are used solely for descriptive purposes and have no special meanings.

[0031] See also Figure 1 , which is a structural schematic diagram of the battery shell of one embodiment. One embodiment of the battery shell of the welding side pressure mechanism of the present invention is illustrated by the battery shell 1. In this embodiment, the battery shell 100 includes a first side plate 11 and a second side plate 12 in a rectangular shape. At this time, the first side plate 11 and the second side plate 12 are in a bent state, and there is a long and narrow gap between the first side plate 11 and the second side plate 12 as a welding point 13. After the first side plate 11 and the second side plate 12 are bent, there is a plate-shaped empty groove (not marked in the figure). It can be understood that in other embodiments, the structure of the battery shell depends on the model of the blade battery it is assembled with, and is not limited to the structure described above.

[0032] Please refer to Figure 2 and Figure 3 The welding side pressure mechanism of the battery shell 1 of the present invention includes a base 2 for side pressure and rolling the battery shell 1, at least two gear assemblies 3 installed on both sides of the base 2, and a driving assembly 4 installed between the gear assemblies 3 on both sides and driving the gear assembly 3 to rotate, and a side pressure assembly 5 installed between the gear assemblies 3 on both sides and away from the driving assembly 4. The base 2 is used to support the battery shell 1 and displace the battery shell 1 during the welding process to weld a long strip of gap. The gear assembly 3 is used to drive the side pressure assembly 5, and the driving assembly 4 is used to drive the gear assembly 3. The side pressure assembly 5 can side press the welding point 13 on the battery shell 1 and drive the battery shell to move on the base to avoid thermal deformation caused by uneven welding and thus poor welding, thereby ensuring the welding effect.

[0033] Please refer to Figure 4 The base 2 includes a support seat 21 that supports the battery housing 1, a bottom plate 22 provided at the bottom of the base 2, and a pad 23 between the support seat 21 and the bottom plate 22. The support seat is suspended above the pad 23. The bottom plate 22 is used to support the pad 23 and the support seat 21. The pad 23 is used to be installed at the rear end of the support seat 21 and suspend the support seat 21. The support seat 21 is plate-shaped and can be matched with the empty groove formed by the first side plate 11 and the second side plate 12. The battery housing 1 can be mounted on the support seat 21 and displaced on the support seat, thereby ensuring the stability of the welding process of the battery housing 1. It can be understood that in some other embodiments, the bottom plate 22 and the pad 23 are not necessary. When installing the support seat 21, the support seat 21 can be positioned by other fixed blocks. It is only necessary to ensure that the battery housing 1 can be mounted on the support seat 21 and can be displaced and the support seat 21 is positioned.

[0034] Please refer to Figure 4 and Figure 8 The support seat 21 is provided with a through groove (not shown in the figure) on the side away from the pad 23, and a first roller group 24 and a second roller group 25 are provided in the through groove. The first roller group 24 and the second roller group 25 are both composed of multiple rollers. The rollers in the first roller group 24 are provided with a welding seam 26 to divide the rollers into two parts. The welding seam 26 prevents welding sand from appearing when welding the battery shell 1 and hindering the transportation of the battery shell 1. The first roller group 24 is used to roll the battery shell 1 on the support seat 21. The second roller group 25 is used to roll the battery shell 1 and displace it on the one hand, and on the other hand, it is used to press the welding point 13 together with the side pressure component 5 to ensure the welding effect of the battery shell 1.

[0035] Please refer to Figure 3 and Figure 5The gear assembly 3 includes a gear plate 31, a cover plate 32 covering the gear plate 31, a plurality of gears 33 mounted on the gear plate 31 and mating with each other, and a gear shaft 34 corresponding to the gears 33. The gear plate 31 is used to install gears 33 arranged in sequence up and down. The gears 33 are divided into an upper gear 331 and a lower gear 332. The lower gear 332 is mated with the gear shaft 34. The cover plate 32 is used to engage the gear plate 31 and expose the gear shaft 34 to cooperate with the side pressure assembly 5. The rotation of the gear drives the side pressure assembly 5 to roll, thereby driving the side pressure assembly 5.

[0036] Please refer to Figure 3 and Figure 6 The driving assembly 4 includes a driving motor 41, a driving shaft 42 mounted on the driving motor 41, and a driving gear 43 sleeved on the driving shaft 42. Figure 3 The driving assembly 4 passes through the mounting hole through the driving shaft 42 and is mounted on the gear assemblies 3 on both sides. At least two driving gears 43 are installed, one is installed close to the driving motor 41, and the other is installed away from the driving motor. The driving gears 43 are installed in the gear assemblies 3 on both sides and are installed above the upper gear 331 closest to one end of the first roller group 24. The gear assembly 3 is driven by the driving motor 41 and is installed on the driving gear 43 to drive the upper gear 331 to rotate and drive other gears to rotate and drive the side pressure assembly 5 and the first roller group 24 and the second roller group 25 to operate.

[0037] Please refer to Figure 3 and Figure 7The side pressure device 5 is mounted above the support seat 21 and installed between the gear assembly 3 and the support seat 21, including a third roller group 51 and a fourth roller group 52 corresponding to the first roller group 24 and the second roller group 25, a side pressure seat 53 on which the third roller group 51 and the fourth roller group 52 are installed, and a plurality of side rollers 54 installed on the inner side of the side pressure seat 53, the side pressure seat 53 is used to install the third roller group 51 and the fourth roller group 52 and the side rollers 54 provided inside, the outer side of the side pressure portion 53 is provided with an elastic member 7 corresponding to the gear shaft 34 of the lower gear of the gear assembly 3, and the upper gear 331 of the gear assembly 3 is extended by the third roller portion 51 Cooperating with the roller shaft 56 of the fourth roller part 52, the third roller group 51 has the same number and shape of rollers as the first roller group 24, and the rollers in the third roller group 51 and the first roller group 24 are provided with a welding seam 26 to divide the roller into two parts. The welding seam 26 prevents welding sand from appearing when welding the battery shell 1 and prevents the battery shell 1 from being transported. The third roller group 51 is used for welding. The welding device (not shown in the figure) passes through the gap in the middle of the third roller group 51 to weld the welding point 13 on the battery shell 1 during welding. The fourth roller group 52 cooperates with the second roller group 25 to press the welding point 13 after welding to make it flat, so as to ensure the effect after welding.

[0038] Please refer to Figure 3 and Figure 8 A cooling air channel 211 is provided inside the support seat 21 to discharge cold air to cool the welding point 13. The cooling air pipeline outputs cold air to the welding point 13 through a cooling air outlet 2111 provided under the first roller group 24 and the second roller group 25, and is also provided with a cooling air inlet 2112 to supply cold air, so as to cool the welding point 13 of the battery shell 1 that has just been welded, thereby preventing the weld at the welding point 13 from being thermally deformed and causing uneven welding, thereby avoiding poor welding and improving product yield.

[0039] The following is the installation process of the welding side pressure mechanism; please refer to Figures 1 to 8, the support seat 21 is installed above the base plate 22 through the pad 23, the first roller group 24 and the second roller group 25 are arranged in sequence in the groove of the support seat 21 near one end of the laser head 6, and then the third roller group 51 and the fourth roller group 52 of the side pressure assembly 5 are aligned with the positions of the first roller group 24 and the second roller group 25 and installed on the support seat 21, and the side pressure seat 53 is loosely fitted on both sides of the support seat 21 through the elastic member 7. When the battery housing 1 is sleeved on the support seat 21, the side pressure seat 53 can be fitted on the battery housing 1 through the elastic force of the elastic member 7, so as to start To ensure the flushness of the welding point, the upper gear 331 of the gear assembly 4 is then aligned with the roller shaft 56 on the side pressure assembly 5 through the hole on the cover plate 32, and the lower gear 332 of the gear assembly is matched with the shaft end (not marked in the figure) on the side pressure assembly through the gear shaft 34. Finally, the driving gears 43 on both sides of the driving assembly 4 are matched with the upper gears 331 of the gear assembly 3 on both sides near the first roller group 24, and then the driving shaft 42 is passed through the gear assembly 3 and connected to the driving gear 43, and the driving motor 41 is connected to the driving shaft on the side of the gear plate of the leaking gear assembly 3 to complete the installation.

[0040] The present invention also discloses a laser welding device, please refer to Figures 1 to 3 It includes the above-mentioned welding side pressure mechanism of the battery shell 1 and a laser head 6 located above the welding side pressure mechanism of the battery shell 1. When welding the battery shell 1 provided with a welding point 13, the welding point 13 of the battery shell 1 is sequentially welded by the laser head 6 by displacement on the welding side pressure mechanism. After welding, the welding point 13 is flattened by the welding side pressure mechanism. The laser head 6 welds the welding point of the battery shell 1 through the gap between the first roller group 24. Since the battery shell 1 is transported on the welding side pressure mechanism.

[0041] The following is a driving process of a laser welding device and a welding side pressure mechanism of the present invention: Please refer to Figures 1 to 8 First, start the drive motor 41 to drive the drive gear 42 and the drive shaft 43 to rotate. The drive gear 43 drives the upper gear 33 to rotate and drives the third roller group 51 and the fourth roller group 52 to roll through the roller shaft 56. The third roller group 51 and the fourth roller group 52 contact the outer surface of the battery shell 1 and drive the battery shell 1 to move. The first roller group 24 and the second roller group 25 contact the inner surface of the battery shell 1 and press the side surface to make the inner surface of the weld 13 flush with the outer surface. The side pressure seat 53 of the side pressure assembly 5 is fitted with the side of the battery shell 1 through the elastic force of the elastic member 7, so it plays a role in ensuring the fit of the weld. The rollers of the first roller group 24 and the third roller group 51 are both provided with slots to prevent welding sand from appearing during welding and hindering the transportation of the battery shell 1.

[0042] The following is a working process of a laser welding device and a welding side pressure mechanism of the present invention; please refer to Figures 1 to 8 , install the unwelded battery shell 1 on the support seat 21. At this time, the laser head 6 is not turned on. The battery shell 1 is driven by the third roller group 51 and the fourth roller group 52 on the side pressure assembly 5 under the drive of the drive assembly 4. After the battery shell 1 is completely set on the support seat 21, the drive assembly 4 reverses the transmission. At this time, the laser head 6 is turned on and the cold air in the cooling air channel 211 is turned on to start welding. After welding is completed, the drive assembly 4, the laser head 6 and the cold air are turned off, the welded battery shell 1 is taken out, and then the unwelded battery shell 1 is installed.

[0043] The technical features of the above embodiments can be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0044] The above embodiments merely represent preferred embodiments of the present invention. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent. It should be noted that a person skilled in the art would be able to make various modifications and improvements without departing from the spirit of the present invention, all of which fall within the scope of protection of the present invention. Therefore, the scope of protection of the patent for this invention shall be determined by the appended claims.

Claims

1. A welding side pressure mechanism for a battery housing, comprising a base, characterized in that: The cam is connected with the second gear of the driving member to the second end of the driving member to rotate, and the cam is connected with the first gear to the second end of the driving member to rotate.

2. The welding side pressure mechanism of the battery case according to claim 1, characterized in that: A second roller group is provided in the groove of the support seat, and the second roller group is composed of a plurality of rollers.

3. The welding side pressure mechanism of the battery case according to claim 1, characterized in that: The gear assembly includes a gear plate, a cover plate covering the gear plate, a plurality of gears arranged on the gear plate and cooperating with each other, and a gear shaft corresponding to the gears.

4. The welding side pressure mechanism of the battery case according to claim 3, characterized in that: The driving assembly includes a driving motor, a driving shaft installed on the driving motor, and a driving gear sleeved on the driving shaft. The driving motor is installed close to the outer side of the gear plate, and the driving shaft passes through the gear assemblies on both sides and is connected to the driving motor.

5. The welding side pressure mechanism of the battery case according to claim 2, characterized in that: The side pressure assembly is mounted above the support seat and cooperates with the gear assembly through an elastic member and is close to the battery housing. It includes a third roller group and a fourth roller group arranged corresponding to the first roller group and the second roller group, a side pressure seat on which the third roller group and the fourth roller group are installed, and a side roller installed on the inner side of the side pressure seat.

6. The welding side pressure mechanism of the battery case according to claim 5, characterized in that: The side rollers are movably mounted on the side pressure seat via the side pressure shafts. The third roller group and the fourth roller group are provided with roller shafts that are exposed outside the side pressure seat.

7. The welding side pressure mechanism of the battery case according to claim 5, characterized in that: The side pressure seats are loosely fitted on both sides of the support seat through elastic members.

8. A laser welding device, characterized in that: The invention comprises a welding side pressure mechanism for a battery shell as described in any one of claims 1 to 7 and a laser head located above the welding side pressure mechanism for the battery shell. When welding the battery shell provided with welding points, the welding points of the battery shell are welded in sequence by the laser head by moving on the welding side pressure mechanism. After welding, the welding points are flattened by the side pressure mechanism.

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