Battery assembly method and battery

Abstract

The invention belongs to the technical field of batteries, and discloses a battery assembly method and a battery. On one hand, before a pole group enters a shell, the surface, without tabs, of the pole group is coated with an insulating film, and a cover plate module or a fixed end plate which is in hot melting with the insulating film is arranged on the side, provided with the tabs, of the pole group, so that six-surface protection is formed on the pole group; on the other hand, during assembly, the welding process of sealing the opening of the shell body is performed before the welding process of the tabs and the connecting pieces, so that the phenomenon that the tabs are damaged due to vibration in the welding process when the shell body is subjected to sealing welding operation is avoided, and the product quality is improved. The tab and the connecting piece which are already welded are affected by adverse factors such as high temperature, the welding quality between the tab and the connecting piece is improved, and due to the fact that the cover plate module and the shell body are in a fixed state, the difficulty of welding operation of the tab and the connecting piece is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of batteries, and in particular to a battery assembly method and a battery. Background Art

[0002] The square shell battery is constructed with a pole group with a pole ear on one side as the core component. The traditional square shell battery assembly process usually first installs the pole group into the battery shell, then bends the positive and negative pole ears on the same side of the pole group for multiple times to form an approximate S shape, and then installs the cover assembly connected with the pole into the open part of the battery shell, and welds the pole ear and the pole of corresponding polarity to the pole. After the welding of the pole ear and the pole is completed, the battery shell and the bare aluminum plate in the cover assembly are welded, and the battery shell is sealed to complete the assembly of the square shell battery.

[0003] However, for square shell batteries assembled by this method, on the one hand, since the surface of one side of the electrode group is provided with a pole ear, in order to avoid interference with the pole ear, an insulating film is usually only coated on the surface of the electrode group without the pole ear, so that when the electrode group is put into the shell, the surface of the electrode group with the pole ear is easily damaged due to lack of protection; on the other hand, not only does it need to complete the welding of the pole ear and the pole column first, but also when welding the bare aluminum plate and the battery shell, adverse factors such as vibration and high temperature during the welding process will affect the already welded pole ear and pole column, resulting in reduced welding quality between the pole column and the pole ear and affecting the conductive efficiency. In addition, when welding the pole ear and the pole column, the cover plate assembly and the battery shell are in a relatively free state, which makes the operation difficult when welding the pole ear and the pole column. Summary of the invention

[0004] The object of the present invention is to provide a battery assembly method and a battery, which have low operation difficulty, high welding quality and good protection.

[0005] To achieve this object, the present invention adopts the following technical solutions:

[0006] In one aspect, a battery assembly method is provided, wherein the battery assembled by the battery assembly method comprises a pole group with pole tabs on the same side, a cover plate module, a shell body, a closing module and at most one fixed end plate;

[0007] The battery assembly method comprises the following steps:

[0008] S1, coating the outer side of the surface of the electrode group without the electrode ear with an insulating film, and disposing the cover plate module or the fixed end plate hot-melted with the insulating film on the side of the electrode group with the electrode ear, if the fixed end plate is hot-melted with the electrode group, executing step S2A, if the cover plate module is hot-melted with the electrode group, executing step S2B;

[0009] S2A, the fixed end plate is provided with an avoidance groove for the pole ear to pass through, the fixed end plate is arranged on the side of the pole group provided with the pole ear, and the fixed end plate and the insulating film are thermally melted, after the fixed end plate and the insulating film are thermally melted, step S3A is performed;

[0010] S3A, the shell body is a single-side open structure with a cavity, the pole assembly with the fixed end plate hot-melted is installed in the cavity in the shell body, the cover plate module is arranged at the open part of the shell body, the cover plate module includes a cover plate body, a pole and a connecting piece, the cover plate body is provided with a connecting window connected to the shell body cavity, one end of the connecting piece is fixed to the cover plate body by the pole, and the other end of the connecting piece extends to the bottom of the connecting window, the fixed end plate is provided with the avoidance groove for the pole ear to pass through, the pole ear passing through the avoidance groove is bent so that the pole ear overlaps the connecting piece on the surface exposed below the connecting window, after completing step S3A, step S4 is executed;

[0011] S2B, the cover plate module further includes an insulating member, the insulating member is provided with a through structure connected to the connection window, the cover plate module is arranged on a side of the electrode group where the electrode ear is arranged, the electrode ear is bent so that the electrode ear is overlapped on the surface of the connecting sheet exposed below the connection window, after completing step S2B, step S4 is performed;

[0012] S4, welding the cover plate body and the outer shell body to close the outer shell body;

[0013] S5, welding the tab exposed below the connection window to the connection sheet;

[0014] S6. The closed module includes a closed plate and an insulating plate, wherein the insulating plate is arranged on a side of the closed plate facing the pole ear, the closed plate is arranged at the connecting window of the cover body, and the closed plate and the cover body are welded.

[0015] Optionally, in step S1, the following steps are also included:

[0016] S11, the battery further includes a bottom support plate, and the bottom support plate is pre-heat-fused at a set position of the insulating film;

[0017] S12, covering the surface of the electrode group where the electrode lug is not provided with the insulating film, and making the bottom support plate cover the surface of the electrode group away from the electrode lug.

[0018] Optionally, in step S6, the following steps are also included:

[0019] S61, a mounting boss is provided on the side of the cover plate body away from the pole group, a mounting through hole connected to the connection window and arranged in a stepped manner is provided on the mounting boss, and a limiting step is formed between the mounting through hole and the connection window, the closing plate comprises a closing portion and a plug-in portion, the insulating plate is provided on the side of the plug-in portion away from the closing portion, the plug-in portion of the closing plate is inserted into the connection window, the closing portion of the closing plate is inserted into the mounting through hole, and the closing portion is abutted against the limiting step;

[0020] S62, welding the sealing portion to the cover plate body.

[0021] Optionally, the overlapping width dimension of the limiting step and the closing portion along the first direction is W, and when the closing portion and the cover plate body are butt-welded, the width dimension W satisfies 0.5 mm ≤ W ≤ 20 mm.

[0022] Optionally, when the closing portion and the cover plate body are through-welded, a width dimension W satisfies 1mm≤W≤20mm.

[0023] On the other hand, a battery is provided, wherein the battery is assembled using any of the battery assembly methods described above.

[0024] Optionally, a plug-in groove is provided on the side of the insulating plate facing away from the closing plate, and a plug-in protrusion is provided on the side of the insulating member facing the cover plate body. The plug-in protrusion is continuously arranged around the circumferential edge of the through structure, and the plug-in protrusion is inserted in the plug-in groove.

[0025] Optionally, the fixed end plate is further provided with a shaping extension, the shaping extension is provided on the wall surface of the avoidance groove, and the angle between the extending direction of the shaping extension and the wall surface is an acute angle.

[0026] Optionally, the connecting piece includes a first connecting portion and a second connecting portion, the first connecting portion is connected to the pole, the second connecting portion is connected to the pole lug, the second connecting portion is provided with an over-through groove, and the pole lug passes through the over-through groove and is connected to the second connecting portion.

[0027] Optionally, the cross-section of the connecting piece is Z-shaped or straight-shaped.

[0028] Beneficial effects of the present invention:

[0029] The present invention provides a battery assembly method. On the one hand, before the electrode group is put into the shell, the surface of the electrode group without the pole ear is coated with an insulating film, and a cover plate module or a fixed end plate which is hot-fused with the insulating film is arranged on the side of the electrode group with the pole ear, so as to form six-sided protection for the electrode group, avoid the electrode group from being damaged when entering the shell, and improve the product quality. On the other hand, during assembly, the welding process of sealing the opening of the shell body is placed before the welding process of the pole ear and the connecting piece, so as to avoid the influence of adverse factors such as vibration and high temperature in the welding process on the already welded pole ear and the connecting piece when the closed welding operation of the shell body is performed, thereby improving the welding quality between the pole ear and the connecting piece, and because the cover plate module and the shell body are in a fixed state, the difficulty of welding the pole ear and the connecting piece is reduced.

[0030] The present invention also provides a battery, which, by applying the above-mentioned battery assembly method, improves welding quality, thereby ensuring higher conductive efficiency, improving power supply capacity and product quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 is a flow chart of the steps of the battery assembly method provided by the present invention;

[0032] Figure 2 It is a structural disassembly diagram of the battery provided by the present invention;

[0033] Figure 3 It is a partial cross-sectional view of the assembled cover plate module and the sealing module in the battery provided by the present invention;

[0034] Figure 4 It is a structural schematic diagram of the cover plate body in the cover plate module provided by the present invention;

[0035] Figure 5 yes Figure 4 A magnified view of the structure of part A;

[0036] Figure 6 It is a structural schematic diagram of an integrated pole and a connecting piece provided by the present invention;

[0037] Figure 7 It is a structural schematic diagram of the insulating member in the cover plate module provided by the present invention;

[0038] Figure 8 is a structural cross-sectional view of a closed module in a battery provided by the present invention;

[0039] Fig. 9 It is a structural schematic diagram of a fixed end plate in a battery provided by the present invention.

[0040] In the figure:

[0041] 100, pole group; 200, pole ear;

[0042] 1. Shell body;

[0043] 2. Cover plate module; 21. Cover plate body; 211. Connection window; 212. Mounting boss; 213. Mounting through hole; 214. Position limiting step; 22. Pole; 23. Connecting piece; 231. First connecting part; 232. Second connecting part; 233. Through-through groove; 24. Insulating member; 241. Through-through structure; 242. Inserting protrusion;

[0044] 3. Closed module; 31. Closed plate; 311. Closed portion; 312. Plug-in portion; 32. Insulating plate; 321. Plug-in groove;

[0045] 4. Fix the end plate; 41. Avoid the through slot; 42. Shape the edge;

[0046] 5. Insulation film;

[0047] 6. Bottom support plate. DETAILED DESCRIPTION

[0048] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0049] 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 integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0050] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0051] In the description of this embodiment, the terms "upper", "lower", "right", etc., directions or positional relationships are based on the directions or positional relationships shown in the drawings, and are only for the convenience of description and simplification of operation, 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 limiting the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0052] When assembling traditional square shell batteries, on the one hand, the welding step of the pole ears and pole posts is located before the welding of the bare aluminum plate and the battery shell, which not only makes the pole ears and pole posts that have completed the welding operation easily affected by the high temperature and vibration when the bare aluminum plate and the battery shell are welded, but also because the bare aluminum plate and the battery shell are in a relatively free state when welding the pole ears and pole posts, which makes it difficult to weld the pole ears and pole posts and is not easy to operate. On the other hand, since the surface of the pole group with the pole ears lacks protection before entering the shell, it is easy to be damaged when entering the shell, affecting product quality.

[0053] Therefore, in order to reduce the difficulty of welding operation and improve the welding quality, the present embodiment provides a battery assembly method, in which the battery assembled by the battery assembly method includes a pole group 100 with a pole ear 200 on the same side, a cover plate module 2, a shell body 1, a closing module 3 and at most one fixed end plate 4.

[0054] like Figures 1 to 9 As shown, the battery assembly method includes the following steps:

[0055] S1, coating the outer side of the surface of the electrode group 100 without the electrode ear 200 with an insulating film 5, and setting a cover plate module 2 or a fixed end plate 4 hot-melted with the insulating film 5 on the side of the electrode group 100 with the electrode ear 200, if the fixed end plate 4 is hot-melted with the electrode group 100, then execute step S2A, if the cover plate module 2 is hot-melted with the electrode group 100, then execute step S2B;

[0056] S2A, the fixed end plate 4 is provided with an avoidance groove 41 for the pole ear 200 to pass through, the fixed end plate 4 is arranged on the side of the pole group 100 provided with the pole ear 200, and the fixed end plate 4 and the insulating film 5 are thermally melted, and after the fixed end plate 4 and the insulating film 5 are thermally melted and step S2A is completed, step S3A is performed;

[0057] S3A, the shell body 1 is a single-side open structure with a cavity, the pole group 100 with the fixed end plate 4 hot-melted is installed in the cavity in the shell body 1, the cover plate module 2 is arranged at the open part of the shell body 1, the cover plate module 2 includes a cover plate body 21, a pole 22 and a connecting piece 23, the cover plate body 21 is provided with a connecting window 211 communicating with the cavity of the shell body 1, one end of the connecting piece 23 is fixed to the cover plate body 21 by the pole 22, and the other end of the connecting piece 23 extends to the bottom of the connecting window 211, and an avoidance groove 41 for the pole ear 200 to pass through is provided on the fixed end plate 4, and the pole ear 200 passing through the avoidance groove 41 is bent so that the pole ear 200 overlaps on the surface of the connecting piece 23 facing the connecting window 211. After completing step S3A, step S4 is executed;

[0058] S2B, the cover plate module 2 further includes an insulating member 24, and a through structure 241 communicating with the connection window 211 is provided on the insulating member 24. The cover plate module 2 is arranged on a side of the electrode group 100 where the electrode ear 200 is arranged, and the electrode ear 200 is bent so that the electrode ear 200 overlaps the surface of the connecting sheet 23 facing the connection window 211. After completing step S2B, step S4 is performed;

[0059] S4, welding the cover plate body 21 and the outer shell body 1 to seal the outer shell body 1;

[0060] S5, welding the tab 200 and the connecting piece 23 below the connecting window 211;

[0061] S6. The closed module 3 includes a closed plate 31 and an insulating plate 32. The insulating plate 32 is arranged on the side of the closed plate 31 facing the pole ear 200. The closed plate 31 is arranged at the connecting window 211 of the cover body 21, and the closed plate 31 and the cover body 21 are welded.

[0062] On the one hand, before the electrode group 100 is put into the shell, the surface of the electrode group 100 without the pole ear 200 is first coated with an insulating film 5, and a cover plate module 2 or a fixed end plate 4 hot-melted with the insulating film 5 is arranged on the side of the electrode group 100 with the pole ear 200, thereby forming six-sided protection for the electrode group 100, avoiding damage to the electrode group 100 when entering the shell, and improving product quality. On the other hand, during assembly, the welding process of sealing the open shell body 1 is located before the welding process of the pole ear 200 and the connecting piece 23, thereby avoiding the adverse factors such as vibration and high temperature during the welding process during the closed welding operation of the shell body 1. The influence of the already welded pole ear 200 and the connecting piece 23 is improved, and the welding quality between the pole ear 200 and the connecting piece 23 is improved. In addition, since the cover plate module 2 and the shell body 1 are in a fixed state, the difficulty of welding the pole ear 200 and the connecting piece 23 is reduced.

[0063] The structure that is hot-melted with the insulating film 5 coated on the outside of the electrode group 100 is a fixed end plate 4 or a cover plate module 2, which can be freely selected according to actual needs. In this embodiment, the fixed end plate 4 is preferably hot-melted with the insulating film 5 on the outside of the electrode group 100. In other embodiments, in order to reduce manufacturing costs, it can be considered to hot-melt the cover plate module 2 and the insulating film 5.

[0064] Alternatively, if Figure 2 As shown, in step S1, the following steps are also included:

[0065] S11, the battery further includes a bottom support plate 6, and the bottom support plate 6 is pre-heat-fused at a set position of the insulating film 5;

[0066] S12 , covering the surface of the electrode group 100 without the electrode tab 200 with the insulating film 5 , and making the bottom support plate 6 cover the surface of the electrode group 100 away from the electrode tab 200 .

[0067] By hot-melting the bottom support plate 6 on the insulating film 5 before coating the insulating film 5, when the insulating film 5 is coated on the electrode group 100, the bottom support plate 6 can cover the surface of the electrode group 100 opposite to the electrode tab 200, so that when the electrode group 100 is put into the shell, the surface of the electrode group 100 opposite to the electrode tab 200 is protected by the bottom support plate 6 to avoid scratches when the electrode group 100 is put into the shell.

[0068] Alternatively, if Figure 3 , Figure 4 , Figure 5 As shown, in step S6, the following steps are also included:

[0069] S61, a mounting boss 212 is provided on the side of the cover body 21 away from the pole group 100, and a mounting through hole 213 communicating with the connection window 211 and distributed in a stepped manner is opened on the mounting boss 212, and a limiting step 214 is formed between the mounting through hole 213 and the connection window 211, the closing plate 31 includes a closing portion 311 and a plug-in portion 312, the insulating plate 32 is provided on the side of the plug-in portion 312 away from the closing portion 311, the plug-in portion 312 of the closing plate 31 is inserted into the connection window 211, the closing portion 311 of the closing plate 31 is inserted into the mounting through hole 213, and the closing portion 311 is abutted against the limiting step 214;

[0070] S62 , welding the sealing portion 311 to the cover body 21 .

[0071] By arranging a mounting boss 212 on the side of the cover body 21 away from the accommodating cavity, and opening mounting through holes 213 connected to the connecting window 211 and distributed in a stepped manner on the mounting boss 212, the installation position of the closing plate 31 is elevated. On the one hand, more installation space is reserved for the pole ear 200, thereby facilitating the subsequent welding of the pole ear 200 and the connecting plate 23. On the other hand, the installation position of the pole ear 200 in the height direction is improved, thereby further reducing the additional occupation of the pole ear 200 in the accommodating cavity, so that the space utilization rate is further improved.

[0072] Alternatively, if Figure 3 As shown, the overlapping width dimension of the limiting step 214 and the closing portion 311 along the first direction is W. When the closing portion 311 and the cover plate body 21 are butt welded, the width dimension W satisfies 0.5 mm ≤ W ≤ 20 mm.

[0073] When the closing portion 311 and the cover plate body 21 are butt-welded, the overlapping width W of the limiting step 214 and the closing portion 311 along the first direction is limited to satisfy 0.5mm≤W≤20mm. On the one hand, it is avoided that the overlapping width is too small, which leads to undesirable phenomena such as broken welds and explosion points during butt welding. On the other hand, it is avoided that the overlapping width is too large, which leads to an increase in the overall external dimensions of the cover plate module 2 and additional costs.

[0074] Alternatively, if Figure 3 As shown, the width dimension of the overlap between the limiting step 214 and the closing part 311 along the first direction is W. When the closing part 311 and the cover plate body 21 are through-welded, the width dimension W satisfies 1mm≤W≤20mm. By limiting the width dimension W of the overlap between the limiting step 214 and the closing part 311 along the first direction when the closing part 311 and the cover plate body 21 are through-welded, so that it satisfies 1mm≤W≤20mm, on the one hand, it is avoided that the overlapping width is too small, resulting in insufficient strength between the cover plate body 21 and the closing plate 31 after through-welding, and failing to meet the 1.2MPa pressure test, and on the other hand, it is avoided that the overlapping width dimension is too large, resulting in an increase in the overall external dimensions of the cover plate module 2, which increases additional costs.

[0075] In this embodiment, if Figure 2 As shown, a battery is also provided, which is assembled by influencing the above-mentioned battery assembly method. By applying the above-mentioned battery assembly method, the battery improves the welding quality, thereby ensuring a higher conductive efficiency, improving the power supply capacity and product quality.

[0076] Alternatively, if Figure 3 , Figure 7 , Figure 8As shown, the insulating plate 32 is provided with an insertion groove 321 on the side facing away from the closing plate 31, and the insulating member 24 is provided with an insertion protrusion 242 on the side facing the cover body 21. The insertion protrusion 242 is continuously arranged around the circumferential edge of the through structure 241, and the insertion protrusion 242 is inserted in the insertion groove 321.

[0077] By providing a plug-in protrusion 242 on the insulating member 24, providing a plug-in groove 321 on the insulating plate 32, and plugging the plug-in groove 321 with the plug-in protrusion 242, on the one hand, it is convenient to position and limit the insulating plate 32 and the insulating member 24 during assembly, thereby ensuring the accuracy of the installation position; on the other hand, since both the insulating plate 32 and the insulating member 24 are insulating, multiple insulation is achieved by plugging the plug-in protrusion 242 with the plug-in groove 321, thereby increasing the insulation distance, preventing short circuits between the closing plate 31, the cover plate body 21 and the metal parts inside the battery housing, and improving safety.

[0078] Alternatively, if Fig. 9 As shown, the fixed end plate 4 is also provided with a shaping extension 42, which is provided on the wall surface of the avoidance slot 41, and the angle between the direction in which the shaping extension 42 extends and the wall surface is an acute angle. By providing the shaping extension 42 in the avoidance slot 41 of the fixed end plate 4, and making the angle between the direction in which the shaping extension 42 extends and the wall surface of the avoidance slot 41 an acute angle, the extension direction of the shaping extension 42 can be mutually fitted with the inclined surface of the terminal lug 200 after the terminal lug 200 is gathered, thereby achieving the effect of gathering and fixing the gathered terminal lug 200, improving the gathered state of the terminal lug 200, and enhancing the gathering effect.

[0079] Alternatively, if Figure 6 As shown, the connecting piece 23 includes a first connecting portion 231 and a second connecting portion 232, the first connecting portion 231 is connected to the pole 22, the second connecting portion 232 is connected to the pole lug 200, and a through-slot 233 is provided on the second connecting portion 232, and the pole lug 200 passes through the through-slot 233 and is connected to the second connecting portion 232. By providing the through-slot 233 on the second connecting portion 232, the shortest path is provided for the pole lug 200 to pass over the connecting piece 23, so that the length of the pole lug 200 is reduced, the space occupied by the pole lug 200 is reduced, and the space utilization rate is improved.

[0080] Optionally, the cross section of the connecting piece 23 is Z-shaped or straight-shaped. In order to adapt to batteries of different specifications and models, in this embodiment, the surface of the first connecting portion 231 facing the cover body 21 is lower than the surface of the second connecting portion 232 facing the cover body 21, so as to form a connecting piece 23 with a Z-shaped cross section. By making the surface of the second connecting portion 232 higher than the surface of the first connecting portion 231, the second connecting portion 232 is used to raise the connection position of the tab 200, thereby further reducing the additional occupation of the tab 200 in the accommodating cavity, so that the space utilization rate is further improved.

[0081] In addition, the connecting piece 23 and the pole 22 can be integrally formed by a molding process, or the connecting piece 23 and the pole 22 can be separately prepared and then welded during assembly. In this embodiment, the pole 22 and the connecting piece 23 are an integral structure, and a through groove 233 is provided on the second connecting portion 232 of the connecting piece 23.

[0082] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. For those skilled in the art, various obvious changes, readjustments and substitutions can be made without departing from the protection scope of the present invention. It is not necessary and impossible to list all the embodiments here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention shall be included in the protection scope of the claims of the present invention.

Claims

1. A battery assembly method, characterized in that: The battery assembled by the battery assembly method comprises a pole group with pole ears on the same side, a cover plate module, a shell body, a closing module and at most one fixed end plate; The battery assembly method comprises the following steps: S1, coating the outer side of the surface of the electrode group without the electrode ear with an insulating film, and disposing the cover plate module or the fixed end plate hot-melted with the insulating film on the side of the electrode group with the electrode ear, if the fixed end plate is hot-melted with the electrode group, executing step S2A, if the cover plate module is hot-melted with the electrode group, executing step S2B; S2A, the fixed end plate is provided with an avoidance groove for the pole ear to pass through, the fixed end plate is arranged on the side of the pole group provided with the pole ear, and the fixed end plate and the insulating film are thermally melted, after the fixed end plate and the insulating film are thermally melted, step S3A is performed; S3A, the shell body is a single-sided open structure with a cavity, the pole assembly with the fixed end plate hot-melted is installed in the cavity in the shell body, the cover plate module is arranged at the open part of the shell body, the cover plate module includes a cover plate body, a pole and a connecting piece, the cover plate body is provided with a connecting window connected to the shell body cavity, one end of the connecting piece is fixed to the cover plate body by the pole, the other end of the connecting piece extends to the bottom of the connecting window, the fixed end plate is provided with the avoidance groove for the pole ear to pass through, the pole ear passing through the avoidance groove is bent so that the pole ear overlaps on the surface of the connecting piece facing the connecting window, after completing step S3A, step S4 is executed; S2B, the cover plate module further includes an insulating member, the insulating member is provided with a through structure connected to the connection window, the cover plate module is arranged on a side of the electrode group where the electrode ear is arranged, the electrode ear is bent so that the electrode ear overlaps the surface of the connecting sheet facing the connection window, after completing step S2B, step S4 is performed; S4, welding the cover plate body and the outer shell body to close the outer shell body; S5, welding the electrode ear and the connecting piece facing the connecting window; S6. The closed module includes a closed plate and an insulating plate, wherein the insulating plate is arranged on a side of the closed plate facing the pole ear, the closed plate is arranged at the connecting window of the cover body, and the closed plate and the cover body are welded.

2. The battery assembly method according to claim 1, characterized in that: In step S1, the following steps are also included: S11, the battery further includes a bottom support plate, and the bottom support plate is pre-heat-fused at a set position of the insulating film; S12, covering the surface of the electrode group where the electrode lug is not provided with the insulating film, and making the bottom support plate cover the surface of the electrode group away from the electrode lug.

3. The battery assembly method according to claim 1, characterized in that: In step S6, the following steps are also included: S61, a mounting boss is provided on the side of the cover plate body away from the pole group, a mounting through hole connected to the connection window and arranged in a stepped manner is provided on the mounting boss, and a limiting step is formed between the mounting through hole and the connection window, the closing plate comprises a closing portion and a plug-in portion, the insulating plate is provided on the side of the plug-in portion away from the closing portion, the plug-in portion of the closing plate is inserted into the connection window, the closing portion of the closing plate is inserted into the mounting through hole, and the closing portion is abutted against the limiting step; S62, welding the sealing portion to the cover plate body.

4. The battery assembly method according to claim 3, characterized in that: The overlapping width dimension of the limiting step and the closing portion along the first direction is W. When the closing portion and the cover plate body are butt welded, the width dimension W satisfies 0.5 mm ≤ W ≤ 20 mm.

5. The battery assembly method according to claim 3, characterized in that: When the sealing portion and the cover plate body are through-welded, the width dimension W satisfies 1mm≤W≤20mm.

6. A battery, characterized in that The battery is assembled using the battery assembly method according to any one of claims 1 to 5.

7. The battery according to claim 6, characterized in that The insulating plate has a plug-in groove on one side facing away from the closing plate, and the insulating member has a plug-in protrusion on one side facing the cover body. The plug-in protrusion is continuously arranged around the circumferential edge of the penetrating structure, and the plug-in protrusion is inserted into the plug-in groove.

8. The battery according to claim 6, characterized in that The fixed end plate is also provided with a shaping extension, and the shaping extension is arranged on the wall surface of the avoidance groove, and the angle between the extending direction of the shaping extension and the wall surface is an acute angle.

9. The battery according to claim 6, characterized in that The connecting piece includes a first connecting portion and a second connecting portion, the first connecting portion is connected to the pole, the second connecting portion is connected to the pole lug, a through-groove is provided on the second connecting portion, and the pole lug passes through the through-groove and is connected to the second connecting portion.

10. The battery according to claim 6, characterized in that The cross section of the connecting piece is Z-shaped or straight-shaped.

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