Battery welding method and battery welding device

Abstract

The battery welding method and the battery welding device are provided in the present disclosure, and relate to the technical field of battery manufacturing. The battery welding method comprises the following steps: fixing a shell, placing a current collector plate in the shell; pressing a disc body, so that the end face of the disc body away from the folding part abuts against the end face of the battery cell; supporting the folding part, so that the folding part is attached to the inner wall of the shell; and penetrating the folding part and the inner wall by a laser beam. The battery welding method can reduce the gap between the folding part of the current collector plate and the inner wall of the shell, and is beneficial to improve the welding quality.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of battery manufacturing, in particular to a battery welding method and a battery welding device. BACKGROUND

[0002] In the prior art, the welding method of the battery includes welding the battery cell and the current collecting disc first, and then using a vibrating mirror to penetrate and weld the current collecting disc and the shell. In this welding method, it is difficult to ensure the gap between the shell and the current collecting disc, and it is easy to weld through, thereby affecting the overcurrent capacity of the battery. SUMMARY

[0003] The purposes of the present application include, for example, providing a battery welding method and a battery welding device that can improve the welding quality, ensure the welding qualification rate, and improve the quality of the battery.

[0004] Embodiments of the present application can be implemented as follows:

[0005] In a first aspect, the present application provides a battery welding method, the battery comprising a battery cell, a shell and a current collecting disc, the battery cell being placed in the shell, the current collecting disc comprising a disc body and a plurality of spaced-apart folded portions arranged around an end face edge of the disc body; the battery welding method comprising:

[0006] fixing the shell and placing the current collecting disc in the shell;

[0007] pressing the disc body so that the end face of the disc body away from the folded portion abuts against the end face of the battery cell;

[0008] supporting the folded portion so that the folded portion is attached to the inner wall of the shell;

[0009] penetrating and welding the folded portion and the inner wall by a laser beam.

[0010] In an optional embodiment, the step of pressing the disc body comprises:

[0011] using a first pressing member to press the disc body; wherein the first pressing member comprises a pressing ring and a plurality of openable and closable pressing heads, the pressing heads being used to press the disc body, and the pressing ring being used to press the top of the shell synchronously;

[0012] The step of supporting the folded portion comprises:

[0013] In the state that the pressing heads press the disc body, the pressing heads are driven to separate from each other to abut against each of the folded portions correspondingly, so that the folded portions are attached to the inner wall;

[0014] The plurality of pressing heads are separated from each other, and the disc body is in a pressed state when each of the plurality of pressing heads corresponds to abutting against each of the folded portions.

[0015] In an optional embodiment, the step of pressing the disc body comprises:

[0016] The disc body is pressed by a second pressing member, wherein the second pressing member applies pressure to the disc body along an axial direction of the battery cell.

[0017] The step of supporting the folded portion comprises:

[0018] The folded portion is pressed by a third pressing member to make the folded portion adhere to the inner wall, wherein the third pressing member applies pressure to the folded portion along a radial direction of the battery cell.

[0019] In an optional embodiment, the step of penetration welding the folded portion and the inner wall by the laser beam comprises:

[0020] The battery or the laser beam is rotated to sequentially weld each of the folded portions and the inner wall.

[0021] In a second aspect, the present application provides a battery welding device, the battery comprising a battery cell, a shell and a current collecting disc, the battery cell being arranged in the shell, the current collecting disc comprising a disc body and a plurality of spaced folded portions arranged around an edge of one end surface of the disc body, the disc body being arranged in the shell and located at one end surface of the battery cell; the battery welding device comprising:

[0022] A fixing assembly for fixing the shell;

[0023] A pressing assembly for synchronously pressing the disc body and a top portion of the shell, and the pressing assembly is also used for supporting the folded portions to make the folded portions adhere to an inner wall of the shell;

[0024] A welding assembly for penetration welding the folded portions and the inner wall;

[0025] A rotating assembly for driving the fixing assembly to rotate;

[0026] A limiting assembly for limiting an outer peripheral wall of the shell.

[0027] In an optional embodiment, the pressing assembly comprises a first pressing member, the first pressing member comprises a pressing ring and a plurality of openable and closeable pressing heads, the pressing heads are used for pressing the disc body, and the pressing ring is used for synchronously pressing the top of the shell; and in the state that the pressing heads press the disc body, the plurality of pressing heads can be separated from each other to correspondingly abut against each of the folded portions, so that the folded portions are attached to the inner wall; wherein, in the process that the plurality of pressing heads are separated from each other, and when the plurality of pressing heads abut against each of the folded portions respectively, the disc body is in a pressed state.

[0028] In an optional embodiment, the pressing assembly comprises a second pressing member, a third pressing member, a first driving member and a second driving member, the first driving member is in transmission connection with the second pressing member, so as to drive the second pressing member to press the disc body; and the second driving member is in transmission connection with the third pressing member, so as to drive the third pressing member to press the folded portions.

[0029] In an optional embodiment, the limiting assembly comprises a third driving member and at least two groups of rollers, the third driving member is in transmission connection with one group of rollers, and the two groups of rollers are arranged on the two sides of the battery respectively, and each group of rollers abuts against the outer circumferential wall of the shell.

[0030] In an optional embodiment, the rotating assembly comprises a rotating driving member, the rotating driving member is connected with the battery, so as to drive the battery to rotate.

[0031] The battery welding device further comprises a rack, the rack is provided with a bearing, the pressing assembly is connected with the bearing, and can rotate relative to the rack through the bearing; in the state that the battery rotates, the pressing assembly rotates synchronously relative to the rack.

[0032] In an optional embodiment, the fixing assembly comprises a bearing table, the battery is arranged on the bearing table, and the bearing table is used for fixing the bottom of the battery.

[0033] The rotating driving member is connected with the bearing table, and drives the bearing table to rotate.

[0034] The beneficial effects of the embodiments of the present application include, for example:

[0035] The battery welding method provided by the embodiments of the present application first fixes the shell, then presses the disc body of the current collector disc, supports the folded portions of the current collector, so that the folded portions are attached to the inner wall of the shell, and then performs welding. In this way, the gap between the folded portions and the inner wall of the shell can be ensured, the welding quality is improved, the welding qualified rate is ensured, and the quality of the battery is improved.

[0036] The battery welding device provided by the embodiment of the present application comprises a fixing assembly for fixing a shell; the pressing assembly can synchronously press the disc body of the current collector disc and the top of the shell, and can also make the folded part adhere to the inner wall of the shell, so as to reduce the gap between the folded part and the inner wall of the shell, improve the welding quality of the current collector disc and the shell, and improve the qualified rate of the battery product. BRIEF DESCRIPTION OF DRAWINGS

[0037] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used in the embodiments will be briefly introduced as follows. It should be understood that the following drawings only show some embodiments of the present application, and therefore should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can also be obtained without creative labor on the basis of the drawings.

[0038] Figure 1 A structural schematic diagram of a current collector disc of a battery provided by the embodiment of the present application;

[0039] Figure 2 A structural schematic diagram of a battery from a certain perspective provided by the embodiment of the present application;

[0040] Figure 3 A structural schematic diagram of a battery welding device from a first perspective provided by the embodiment of the present application;

[0041] Figure 4 A structural schematic diagram of a battery welding device from a second perspective provided by the embodiment of the present application;

[0042] Figure 5 A structural schematic diagram of a battery welding device from a third perspective provided by the embodiment of the present application;

[0043] Figure 6 A Figure 5 A local enlarged schematic diagram of position A in FIG.

[0044] FIG. 100: battery welding device; 101: rack; 110: bearing table; 120: first pressing part; 121: pressing head; 123: abutting ring; 131: first roller; 133: second roller; 135: fine adjustment structure; 140: detector; 150: bearing; 160: rotary driving part; 200: battery; 210: shell; 211: outer peripheral wall; 213: inner wall; 220: current collector disc; 221: disc body; 223: folded part; 225: isolation groove. DETAILED DESCRIPTION

[0045] In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the following will clearly and completely describe the technical solutions in the embodiments of the present application with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some but not all of the embodiments of the present application. The components of the embodiments of the present application described and shown in the drawings can be arranged and designed in various different configurations.

[0046] Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the claimed application, but only represents selected embodiments of the application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the scope of protection of the present application.

[0047] It should be noted that: similar reference numbers and letters represent similar items in the following drawings, therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0048] In the description of the present application, it should be noted that if the terms "upper", "lower", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship when the product of the present application is usually placed, only for the convenience of describing the present application and simplifying the description, and it is not intended to indicate or imply that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, therefore, it cannot be understood as a limitation on the present application.

[0049] In addition, if the terms "first", "second" and the like appear, they are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0050] It should be noted that the features in the embodiments of the present application can be combined with each other without conflict.

[0051] First embodiment

[0052] Please refer to Figures 1 to 6 The present embodiment provides a battery welding method, the battery 200 includes a battery cell, a shell 210 and a current collector 220, the battery cell is placed in the shell 210, the current collector 220 includes a disc body 221 and a plurality of spaced-apart folding portions 223 arranged around the edge of one end surface of the disc body 221; the battery welding method comprises:

[0053] Step S100: fix the shell 210, and place the current collector 220 in the shell 210.

[0054] Step S200: compress the disc body 221, so that the end surface of the disc body 221 away from the folding portion 223 abuts against the end surface of the battery cell.

[0055] Step S300: supporting the folded portions 223 for the folded portions 223 to be attached to the inner wall 213 of the shell 210.

[0056] Step S400: the laser beam penetrates the folded portions 223 and the inner wall 213.

[0057] The step of fixing the shell 210 includes fixing the bottom and the peripheral wall 211 of the shell 210.

[0058] Optionally, the step of pressing the disc body 221 includes pressing the disc body 221 by the first pressing member 120. The first pressing member 120 includes the abutting ring 123 and a plurality of openable and closeable pressing heads 121. The pressing heads 121 are used to press the disc body 221, and the abutting ring 123 is used to press the top of the shell 210 synchronously to prevent the battery 200 from jumping up and down.

[0059] The step of supporting the folded portions 223 includes driving the plurality of pressing heads 121 to separate from each other to correspondingly abut each folded portion 223 for the folded portions 223 to be attached to the inner wall 213 of the shell 210 in the state that the pressing heads 121 press the disc body 221. In the process of separating the plurality of pressing heads 121 from each other and when the plurality of pressing heads 121 abut each folded portion 223 correspondingly, the disc body 221 is in a pressed state. It can be understood that the pressing heads 121 can exert an axial pressure along the axis of the battery cell to press the disc body 221. The pressing heads 121 can also exert a radial pressure along the radial direction of the battery cell to make the folded portions 223 attached to the inner wall 213 of the shell 210. In the embodiment, the axial pressure exerted by the pressing heads 121 is within a preset pressure range, so that the disc body 221 can be abutted to the end face of the battery cell, and the pressing heads 121 can move to support the folded portions 223 in the abutted state, thereby reducing the gap between the folded portions 223 and the inner wall 213 of the shell 210, which is conducive to improving the welding quality. Optionally, the first pressing member 120 can be a multi-claw air cylinder. The multi-claw air cylinder can exert an axial pressure along the axis of the battery cell to press the disc body 221. The abutting ring 123 is connected to the multi-claw air cylinder, and the abutting ring 123 is used to press the top of the shell 210 along the axis of the battery cell. The plurality of claw portions of the multi-claw air cylinder correspond to the pressing heads 121 and can separate from each other to support the folded portions 223 to be attached to the inner wall 213 of the shell 210. In the embodiment, the bottom surface of the claw portion of the multi-claw air cylinder abuts the disc body 221, and the side surface of the claw portion abuts the folded portions 223.

[0060] Of course, it is not limited to this, in other embodiments, the pressing disc body 221 adopts a second pressing member, and the support folded part 223 adopts a third pressing member. That is, the second pressing member is used to press the disc body 221; wherein the second pressing member applies pressure to the disc body 221 along the axial direction of the battery cell. The third pressing member is used to press the folded part 223, so that the folded part 223 is attached to the inner wall 213 of the shell 210. Wherein the third pressing member applies pressure to the folded part 223 along the radial direction of the battery cell. Optionally, the second pressing member and the third pressing member can be independent of each other. Alternatively, the second pressing member adopts a resisting block, and the third pressing member adopts a multi-claw air cylinder, the resisting block can be arranged at the center of the plurality of claw parts of the multi-claw air cylinder, the resisting block is used to press the disc body 221, and the claw part of the multi-claw air cylinder is used to support the folded part 223.

[0061] Optionally, the step of penetrating and welding the folded part 223 and the inner wall 213 by the laser beam includes: rotating the battery 200 or the laser beam to sequentially weld each folded part 223 and the inner wall 213. In this embodiment, the battery 200 is rotated, and the laser beam penetrates and welds the folded part 223 and the inner wall 213 of the shell 210 in the direction from the outer peripheral wall 211 of the shell 210 to the inner wall 213 of the shell 210. Optionally, a controller such as PLC can be used to set the required welding track for segmented and sequential welding, and automatically match the rotation speed of the battery 200 and the welding time. It is easy to understand that the laser emits a laser beam to weld according to the set power waveform, and during the welding process, the gas blowing protection can be implemented in advance, and the gas blowing is stopped after a certain time delay after welding. For example, the protection gas is closed one second after welding, which can improve the welding quality.

[0062] The battery welding method provided in this embodiment fixes the shell 210, and then presses the current collecting disc 220, so that the folded part 223 of the current collecting disc 220 is attached to the inner wall 213 of the shell 210, the gap between the folded part 223 and the inner wall 213 is reduced, the welding through is prevented, the welding quality is improved, and the welding qualified rate is improved.

[0063] Second embodiment

[0064] The application provides a battery welding device 100, a battery 200 comprising a battery cell, a shell 210 and a current collector 220, the battery cell is arranged in the shell 210, the current collector 220 comprises a disc body 221 and a plurality of spaced-apart folded portions 223 arranged around an edge of one end surface of the disc body 221, and the disc body 221 is arranged in the shell 210 and located at one end surface of the battery cell. The battery welding device 100 comprises a fixing assembly, a pressing assembly, a welding assembly, a rotating assembly and a limiting assembly. The fixing assembly is used for fixing the shell 210, the pressing assembly is used for synchronously pressing the top of the disc body 221 and the shell 210, and the pressing assembly is also used for supporting the folded portions 223 so that the folded portions 223 are attached to the inner wall 213 of the shell 210. The welding assembly is used for penetrating welding of the folded portions 223 and the inner wall 213. The rotating assembly is used for driving the fixing assembly to rotate, and the limiting assembly is used for limiting the outer peripheral wall 211 of the shell 210.

[0065] In the embodiment, the fixing assembly is used for fixing the bottom of the shell 210, and a bearing table 110 can be used for limiting the bottom of the battery 200. Alternatively, a limiting groove is arranged on the bearing table 110, the shell 210 is arranged in the limiting groove, and the limiting groove limits the shell 210.

[0066] The pressing assembly comprises a first pressing member 120, the first pressing member 120 comprises a pressing ring 123 and a plurality of openable and closable pressing heads 121, the pressing heads 121 are used for pressing the disc body 221, and the pressing ring 123 is used for synchronously pressing the top of the shell 210. In the state that the pressing heads 121 press the disc body 221, the plurality of pressing heads 121 can be separated from each other to correspondingly abut each folded portion 223, so that the folded portions 223 are attached to the inner wall 213. In the process that the plurality of pressing heads 121 are separated from each other and when the plurality of pressing heads 121 abut each folded portion 223, respectively, the disc body 221 is in a pressed state. In the embodiment, the first pressing assembly adopts a multi-claw air cylinder, and the multi-claw air cylinder is connected with the pressing ring 123. The multi-claw air cylinder can apply an axial pressure along the battery cell to press the disc body 221, so that the bottom surface of the claw portion of the multi-claw air cylinder abuts the disc body 221. At the same time, the pressing ring 123 is pressed on the top of the shell 210 to prevent the shell 210 from jumping axially. The plurality of claw portions of the multi-claw air cylinder can be separated from each other to support the folded portions 223 in the radial direction of the battery cell, at this time, the side surface of the claw portion abuts the folded portions 223. It should be understood that the axial pressure applied by the claw portion to the disc body 221 is within a reasonable preset pressure range, so that the claw portion can be separated from each other and moved in the state of applying pressure to the disc body 221 to support the folded portions 223. That is, in the process of supporting the folded portions 223, the disc body 221 is always subjected to the axial pressure of the claw portion.

[0067] It should be noted that the claw part can be driven by a driver to exert axial pressure on the disc body 221. The claw part can be driven by another driver to move the plurality of claw parts away from each other, thereby supporting the folded part 223. The driver can be a driving motor or a motor, which is not limited here.

[0068] Alternatively, in some embodiments, the pressing assembly can also adopt other structural forms. For example, the pressing assembly includes a second pressing member, a third pressing member, a first driving member and a second driving member, the first driving member is in transmission connection with the second pressing member to drive the second pressing member to hold the disc body 221; the second driving member is in transmission connection with the third pressing member to drive the third pressing member to hold the folded part 223. The second pressing member and the third pressing member can be independent of each other. For example, the second pressing member is a resisting block, the first driving member is a motor or an electric push rod, etc., the resisting block holds the disc body 221 under the action of the first driving member. The third pressing member can be a multi-claw cylinder, the second driving member drives the claw parts of the multi-claw cylinder to move away from each other to support the folded part 223, so that the folded part 223 is attached to the inner wall 213 of the shell 210, reducing the gap between the folded part 223 and the inner wall 213, which is beneficial to improve the welding quality.

[0069] It should be noted that in the present embodiment, the number of folded parts 223 of the current collector disc 220 is multiple, and there is a separation groove 225 between adjacent two folded parts 223, so that the attachment effect of the folded part 223 and the inner wall 213 is better, further reducing the gap between the folded part 223 and the inner wall 213, and improving the welding quality. Alternatively, the number of folded parts 223 is three, four, five, six, seven or eight, etc. The number of claw parts in the multi-claw cylinder can be equal to the number of folded parts 223, or can not be equal, which is not limited here.

[0070] Optionally, the limiting assembly comprises a third driving member and at least two groups of rollers, the third driving member is in transmission connection with one of the groups of rollers, and the two groups of rollers are arranged on the two sides of the battery 200 respectively and abut against the outer circumferential wall 211 of the shell 210. In this embodiment, the two groups of rollers comprise a first roller 131 and a second roller 133, the first roller 131 and the second roller 133 are oppositely arranged, the third driving member is in transmission connection with one of the groups of rollers, and drives the group of rollers to move close to or away from the other group of rollers, that is, the third driving member is used to adjust the distance between the two groups of rollers, so as to facilitate the placement and removal of the battery 200. The third driving member comprises but is not limited to a driving motor. Optionally, the third driving member is used to coarsely adjust the distance between the two groups of rollers. The one group of rollers is further provided with a fine adjustment structure 135, and the fine adjustment structure 135 is used to finely adjust the distance between the two groups of rollers, so as to limit the outer circumferential wall 211 of the shell 210. The fine adjustment structure 135 can be a bolt or a stud, etc. Since the battery 200 will rotate during the welding process, at least two groups of rollers are used to limit the shell 210 of the battery 200, which can not only prevent the shell 210 from shaking, but also ensure the smooth rotation of the shell 210. The rollers can avoid damaging the surface of the shell 210 during the limiting process. Of course, the number of rollers can be three or four, etc., which is not limited here.

[0071] Optionally, the rotating assembly comprises a rotating driving member 160, the rotating driving member 160 is connected with the battery 200 to drive the battery 200 to rotate. The rotating driving member 160 comprises but is not limited to a driving motor. In this embodiment, the rotating driving member 160 is connected with the bearing table 110, and drives the bearing table 110 to rotate, thereby driving the battery 200 to rotate. The battery welding device 100 further comprises a rack 101, and the pressing assembly is mounted on the rack 101. Optionally, the rack 101 is provided with a bearing 150, and the pressing assembly is connected with the bearing 150, so that the pressing assembly can rotate relative to the rack 101 through the bearing 150. Moreover, in the state that the battery 200 rotates, the pressing assembly rotates synchronously relative to the rack 101.

[0072] Of course, in other optional embodiments, the battery 200 can also be fixed, and the laser is rotated to sequentially weld the multiple folding parts 223.

[0073] Optionally, the rack 101 is further provided with a detector 140, and the detector 140 is used to detect whether the battery 200 is installed in place. After detecting that the battery 200 is installed in place, the battery 200 is fixed, pressed and welded, etc. Optionally, the detector 140 can adopt a proximity switch, etc.

[0074] The battery welding device 100 provided by the embodiment of the present application has the following working principle:

[0075] The battery 200 is placed on the bearing table 110 to fix the bottom of the shell 210. The distance between the two groups of rollers is adjusted to limit the outer peripheral wall 211 of the shell 210 by the rollers. The multi-claw cylinder is pressed down, the claw part of the multi-claw cylinder is pressed against the disc body 221, at the same time, the abutting ring 123 synchronously presses against the top of the shell 210 to prevent the shell 210 from jumping up and down. In the state of pressing the disc body 221, the plurality of claw parts are separated from each other to support the folded part 223, so that the folded part 223 is attached to the inner wall 213 of the shell 210, and the gap between the folded part 223 and the inner wall 213 of the shell 210 is reduced. The bearing table 110 is rotated to drive the battery 200 to rotate, and at the same time, the multi-claw cylinder is synchronously rotated relative to the rack 101. The laser emits a laser beam to penetrate the shell 210 from the outside of the shell 210 to the inner wall 213 of the shell 210 to penetrate the inner wall 213 and the folded part 223. The plurality of folded parts 223 are welded to the inner wall 213 in turn. During the welding process, the protective gas is blown in advance, and the protective gas is closed after the welding is completed.

[0076] The parts not mentioned in the embodiment are similar to those described in the first embodiment, and will not be described here.

[0077] In summary, the battery welding method and the battery welding device 100 provided by the embodiment have the following beneficial effects:

[0078] The battery welding method provided by the embodiment fixes the shell 210 first, then presses the disc body 221 of the current collector disc 220 and supports the folded part 223 of the current collector to make the folded part 223 attached to the inner wall 213 of the shell 210, and then performs welding. In this way, the gap between the folded part 223 and the inner wall 213 of the shell 210 can be reduced, welding-through can be prevented, and the welding quality can be improved, so as to ensure the welding qualification rate and improve the quality of the battery 200.

[0079] The battery welding device 100 provided by the embodiment includes a fixing assembly for fixing the shell 210; the pressing assembly can synchronously press the disc body 221 of the current collector disc 220 and the top of the shell 210, and also can make the folded part 223 attached to the inner wall 213 of the shell 210 to reduce the gap between the folded part 223 and the inner wall 213 of the shell 210, so as to improve the welding quality of the current collector disc 220 and the shell 210, and improve the qualification rate of the battery 200 product.

[0080] The above is only a specific embodiment of the present application, but the protection scope of the present application is not limited to this. Any changes or replacements within the technical range disclosed by the present application can be easily thought by those skilled in the art, which should be covered in the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A battery welding method, characterized in that, The battery includes a cell, a casing, and a current collector. The cell is placed inside the casing, and the current collector includes a disk body and a plurality of spaced-apart folded portions arranged around one end edge of the disk body. The battery welding method includes: Fix the housing and place the collector plate inside the housing; Press the disc body so that the end face of the disc body away from the folded part abuts against the end face of the battery cell; Support the folding part so that the folding part fits against the inner wall of the housing; Rotate the battery, and the laser beam penetrates and welds the folded portion to the inner wall; The step of pressing the disc body includes: The disc body is held in place by a first clamping member; wherein the first clamping member includes a clamping ring and a plurality of openable and closable pressure heads, the pressure heads being used to hold the disc body, and the clamping ring being used to simultaneously hold the top of the housing. The step of supporting the folding portion includes: While the pressure head is holding the disc body, the multiple pressure heads are driven to separate from each other to correspondingly abut against each of the folded parts, so that the folded parts fit against the inner wall; During the process of the multiple pressure heads separating from each other, and when the multiple pressure heads respectively press against each of the folding parts, the disc body is under pressure.

2. The battery welding method according to claim 1, characterized in that, The step of using the laser beam to penetrate and weld the folded portion to the inner wall includes: Rotate the battery or the laser beam to sequentially weld each of the folded sections to the inner wall.

3. A battery welding apparatus, characterized in that, The battery includes a cell, a casing, and a current collector. The cell is placed inside the casing. The current collector includes a disk body and a plurality of spaced-apart folded portions arranged around one end face edge of the disk body. The disk body is disposed inside the casing and located at one end face of the cell. The battery welding device includes: Fixing component, the fixing component being used to fix the housing; A clamping assembly is used to simultaneously clamp the top of the disc and the housing, and the clamping assembly is also used to support the folding part so that the folding part fits against the inner wall of the housing; A welding assembly for penetrating and welding the folded portion to the inner wall; A rotating component is used to drive the fixed component to rotate; A limiting component is used to limit the outer peripheral wall of the housing; The clamping assembly includes a first clamping member, which includes a clamping ring and a plurality of openable and closable pressure heads. The pressure heads are used to press the disc body, and the clamping ring is used to simultaneously press the top of the housing. When the pressure heads are pressing the disc body, the plurality of pressure heads can separate from each other to correspondingly abut against each of the folded portions, so that the folded portions can fit against the inner wall. During the process of the plurality of pressure heads separating from each other, and when the plurality of pressure heads respectively abut against each of the folded portions, the disc body is in a compressed state.

4. The battery welding apparatus according to claim 3, characterized in that, The limiting component includes a third driving member and at least two sets of rollers. The third driving member is throttle-connected to one of the sets of rollers. The two sets of rollers are respectively located on both sides of the battery, and each set of rollers abuts against the outer peripheral wall of the housing.

5. The battery welding apparatus according to claim 3, characterized in that, The rotating assembly includes a rotating drive component, which is connected to the battery to drive the battery to rotate; The battery welding device also includes a frame with bearings on it. The clamping assembly is connected to the bearings and can rotate relative to the frame via the bearings. When the battery is rotating, the clamping assembly rotates synchronously relative to the frame.

6. The battery welding apparatus according to claim 5, characterized in that, The fixing component includes a support platform, on which the battery is disposed, and the support platform is used to fix the bottom of the battery; The rotary drive component is connected to the support platform and drives the support platform to rotate.

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