Battery assembly method and battery

Abstract

The invention belongs to the technical field of batteries, and discloses a battery assembly method and a battery. According to the battery assembly method, 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 at most one fixing end plate is arranged on the surface, with the tabs, of the pole group, so that at least five-face protection is formed before the pole group enters the shell; on the other hand, the first wall surface and the second wall surface which form the shell body are of the integrated structure, and the connecting window for welding the tabs is formed in the first wall surface, so that after the tabs are welded, the shell body can be sealed without welding operation on the side of the first wall surface, and the sealing effect is improved; therefore, the tab on the first wall surface side is prevented from being influenced by adverse factors such as vibration and high temperature generated by welding operation when the shell body is closed after the welding operation is completed, the welding quality is improved, the tab and the connecting piece are in a relatively stable state when the welding operation is performed, and the welding difficulty 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, the electrode group is easily damaged because it is easy to collide with the battery shell when the electrode group is inserted into the shell, affecting the product quality; 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, affecting the conductive efficiency, and when welding the pole ear and the pole column, the cover plate assembly and the battery shell are in a relatively free state, resulting in greater difficulty in the operation of 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] On the one hand, 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 shell module, a sealing module, a bottom sealing plate 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 to form an electrode group unit, and providing at most one fixed end plate hot-melted with the insulating film on the side of the electrode group with the electrode ear, and the fixed end plate is provided with an avoidance groove for the electrode ear to pass through;

[0009] S2, the shell module comprises a shell body, a pole and a connecting piece, the shell body is a hollow shell structure with a single-side opening, and comprises a first wall surface opposite to the opening and a plurality of second walls arranged around the first wall surface, a connecting window communicating with the cavity is provided on the first wall surface, one end of the connecting piece is fixed to the first wall surface by the pole, and the other end of the connecting piece extends to below the connecting window, the pole group unit is installed into the cavity of the shell body, and the pole ear is bent so that the pole ear overlaps the surface of the connecting piece facing the connecting window;

[0010] S3, welding the bottom sealing plate to the open portion of the outer shell body to seal the outer shell body;

[0011] S4, welding the electrode tab and the connecting piece facing the connecting window;

[0012] S5. The closed module includes a closed plate and an insulating plate, wherein the insulating plate is arranged on the side of the closed plate facing the pole ear, the closed plate is arranged at the connecting window of the first wall, and the closed plate is welded to the shell body.

[0013] Optionally, in step S1, the following steps are also included:

[0014] 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;

[0015] 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.

[0016] Optionally, in step S5, the following steps are also included:

[0017] S51, a mounting boss is provided on a side of the first wall 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 a 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;

[0018] S52, welding the closing portion to the first wall surface.

[0019] 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 first wall surface are butt-welded, the width dimension W satisfies 0.5mm≤W≤20mm.

[0020] Optionally, when the closed portion and the first wall are through-welded, a width dimension W satisfies 1 mm ≤ W ≤ 20 mm.

[0021] On the other hand, a battery is also provided, wherein the battery is assembled using any of the battery assembly methods described above.

[0022] Optionally, the shell module also includes an insulating part, which is arranged on the side of the first wall facing the pole group and is provided with a through structure connected to the connecting window. The side of the insulating plate facing away from the closing plate is provided with a plug-in groove, and the side of the insulating part facing the cover plate body is provided with a plug-in protrusion, 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.

[0023] 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.

[0024] 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.

[0025] Optionally, the cross-section of the connecting piece is Z-shaped or straight-shaped.

[0026] Beneficial effects of the present invention:

[0027] 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 electrode ear is first coated with an insulating film, and at most one fixed end plate is set on the surface of the electrode group with the electrode ear, so that the electrode group is protected on at least five sides before entering the shell, thereby avoiding damage to the electrode group when entering the shell, and improving product quality. On the other hand, since the first wall and the second wall constituting the shell body are an integrated structure, and a connection window for realizing the electrode ear welding operation is opened on the first wall, not only does it make the first wall side not need to achieve the closure of the shell body through welding operation after the electrode ear completes the welding process, thereby avoiding the electrode ear on the first wall side from being affected by adverse factors such as vibration and high temperature generated by the welding operation when the shell body is closed after the welding operation is completed, thereby improving the welding quality, and making the electrode ear and the connecting piece in a relatively stable state during the welding operation, thereby reducing the difficulty of the welding operation between the electrode ear and the connecting piece.

[0028] 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

[0029] Figure 1 is a flow chart of the steps of the battery assembly method provided by the present invention;

[0030] Figure 2 It is a structural disassembly diagram of the battery provided by the present invention;

[0031] Figure 3 It is a partial cross-sectional view of the first wall surface and the closed module of the battery provided by the present invention after being assembled;

[0032] Figure 4 It is a structural schematic diagram of the shell body in the shell module provided by the present invention;

[0033] Figure 5 yes Figure 4 A magnified view of the structure of part A;

[0034] Figure 6 It is a structural schematic diagram of an integrated pole and a connecting piece provided by the present invention;

[0035] Figure 7 It is a structural schematic diagram of an insulating member in a housing module provided by the present invention;

[0036] Figure 8 is a structural cross-sectional view of a closed module in a battery provided by the present invention;

[0037] Fig. 9 It is a structural schematic diagram of a fixed end plate in a battery provided by the present invention.

[0038] In the figure:

[0039] 100, pole group; 200, pole ear;

[0040] 1. Shell module; 11. Shell body; 111. First wall; 112. Second wall; 113. Connection window; 114. Mounting boss; 115. Mounting through hole; 116. Positioning step; 12. Pole; 13. Connecting piece; 131. First connecting part; 132. Second connecting part; 133. Through-through groove; 14. Insulating member; 141. Through-through structure; 142. Inserting protrusion;

[0041] 2. Bottom sealing plate;

[0042] 3. Closed module; 31. Closed plate; 311. Closed portion; 312. Plug-in portion; 32. Insulating plate; 321. Plug-in groove;

[0043] 4. Fix the end plate; 41. Avoid the through slot; 42. Shape the edge;

[0044] 5. Insulation film;

[0045] 6. Bottom support plate. DETAILED DESCRIPTION

[0046] 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.

[0047] 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.

[0048] 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.

[0049] 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.

[0050] 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 lacks protection before entering the shell, the pole group is easily damaged when entering the shell, affecting product quality.

[0051] Therefore, in order to reduce the difficulty of welding operation, improve welding quality and enhance protection, the present embodiment provides a battery assembly method. The battery assembled by the battery assembly method includes a pole group 100 with pole ears 200 on the same side, a shell module 1, a closing module 3, a bottom sealing plate 2 and at most one fixed end plate 4.

[0052] like Figures 1 to 9 As shown, the battery assembly method includes the following steps:

[0053] S1, coating the outer side of the surface of the electrode group 100 without the electrode ear 200 with an insulating film 5 to form an electrode group unit, and disposing at most one fixed end plate 4 hot-melted with the insulating film 5 on the side of the electrode group 100 with the electrode ear 200, and the fixed end plate 4 is provided with an avoidance groove 41 for the electrode ear 200 to pass through;

[0054] S2. The housing module 1 includes a housing body 11, a pole 12 and a connecting piece 13. The housing body 11 is a hollow shell structure with a single-side opening, and includes a first wall 111 opposite to the opening and a plurality of second walls 112 arranged around the first wall 111. A connecting window 113 communicating with the cavity is provided on the first wall 111. One end of the connecting piece 13 is fixed to the first wall 111 by the pole 12, and the other end of the connecting piece 13 extends to the bottom of the connecting window 113. The pole group unit is installed in the cavity of the housing body 11, and the pole ear 200 is bent so that the pole ear 200 overlaps the surface of the connecting piece 13 facing the connecting window 113.

[0055] S3, welding the bottom sealing plate 2 to the open portion of the outer shell body 11 to seal the outer shell body 11;

[0056] S4, welding the electrode tab 200 facing the connection window 113 and the connection sheet 13;

[0057] S5. 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 113 of the first wall 111, and the closed plate 31 and the shell body 11 are welded.

[0058] In the battery assembly method, 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 at most one fixed end plate 4 is arranged on the side of the electrode group 100 with the pole ear 200, so that the electrode group 100 is protected on at least five sides before being put into the shell, thereby avoiding damage to the electrode group 100 when it is put into the shell and improving the product quality. On the other hand, since the first wall 111 and the second wall 112 constituting the shell body 11 are an integrated structure, and a hole for welding the pole ear 200 is provided on the first wall 111, the electrode group 100 is provided with a plurality of fixed end plates 4, so that the electrode group 100 is protected on at least five sides before being put into the shell, thereby avoiding damage to the electrode group 100 when it is put into the shell and improving the product quality. The professional connecting window 113 not only makes it unnecessary to seal the shell body 11 through welding on the first wall 111 side after the welding process of the pole ear 200 is completed, thereby avoiding the pole ear 200 on the first wall 111 side from being affected by adverse factors such as vibration and high temperature generated by the welding operation when the shell body 11 is closed after the welding operation is completed, thereby improving the welding quality, and the pole ear 200 and the connecting piece 13 are in a relatively stable state during the welding operation, thereby reducing the difficulty of the welding operation of the pole ear 200 and the connecting piece 13.

[0059] The number of the fixed end plates 4 arranged on the side of the pole group 100 where the pole lug 200 is provided can be freely set according to the requirements, and can be set to one or not.

[0060] In this embodiment, a fixed end plate 4 hot-melt with the insulating film 5 is provided on one side of the electrode group 100 having the electrode ear 200. The fixed end plate 4 cooperates with the insulating film 5 to achieve six-sided protection of the electrode group 100 before entering the shell, thereby improving the protection performance of the electrode group 100 and avoiding damage to the electrode group 100 when entering the shell, which affects the product quality.

[0061] In other embodiments, in order to reduce manufacturing costs, shorten assembly processes, and improve assembly efficiency, it is possible to consider not providing the fixed end plate 4. In this case, before the pole group 100 is placed in the shell, a five-sided protection structure is formed by covering with an insulating film 5.

[0062] Alternatively, if Figure 2 As shown, in step S1, the following steps are also included:

[0063] 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;

[0064] 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 .

[0065] 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.

[0066] Optionally, Figure 3 , Figure 4 , Figure 5 As shown, in step S5, the following steps are also included:

[0067] S51, a mounting boss 114 is provided on the side of the first wall 111 away from the pole group 100, a mounting through hole 115 communicating with the connection window 113 and arranged in a stepped manner is provided on the mounting boss 114, and a limiting step 116 is formed between the mounting through hole 115 and the connection window 113, the closing plate 31 comprises 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 113, the closing portion 311 of the closing plate 31 is inserted into the mounting through hole 115, and the closing portion 311 is abutted against the limiting step 116;

[0068] S52 , welding the sealing portion 311 to the first wall surface 111 .

[0069] By arranging a mounting boss 114 on the side of the first wall 111 away from the accommodating cavity, and opening mounting through holes 115 connected to the connecting window 113 and distributed in a stepped manner on the mounting boss 114, 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 13. On the other hand, the installation position of the pole ear 200 in the height direction is increased, thereby further reducing the additional occupation of the pole ear 200 in the accommodating cavity, so that the space utilization rate is further improved.

[0070] Alternatively, if Figure 3 As shown, the overlapping width of the limiting step 116 and the closing portion 311 along the first direction is W. When the closing portion 311 and the first wall surface 111 are butt welded, the width W satisfies 0.5 mm ≤ W ≤ 20 mm.

[0071] When the closing portion 311 and the first wall surface 111 are butt-welded, the overlapping width W of the limiting step 116 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 may cause 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 may increase the overall external dimensions of the shell body 11 and increase additional costs.

[0072] Alternatively, if Figure 3 As shown, the width dimension of the overlap between the limiting step 116 and the closing portion 311 along the first direction is W. When the closing portion 311 and the first wall 111 are through-welded, the width dimension W satisfies 1mm≤W≤20mm. By limiting the width dimension W of the overlap between the limiting step 116 and the closing portion 311 along the first direction when the closing portion 311 and the first wall 111 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 first wall 111 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 shell body 11, which increases additional costs.

[0073] 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.

[0074] Alternatively, if Figure 3 , Figure 7 , Figure 8 As shown, the shell module also includes an insulating member 14, which is arranged on the side of the first wall facing the pole group 100 and is provided with a through structure 141 connected to the connection window, and a plug-in groove 321 is provided on the side of the insulating plate 32 facing away from the closing plate 31, and a plug-in protrusion 142 is provided on the side of the insulating member 14 facing the cover body, and the plug-in protrusion 142 is continuously arranged around the circumferential edge of the through structure 141, and the plug-in protrusion 142 is inserted in the plug-in groove 321.

[0075] By providing a plug-in protrusion 142 on the insulating member 14, providing a plug-in groove 321 on the insulating plate 32, and plugging the plug-in groove 321 with the plug-in protrusion 142, on the one hand, it is convenient to position and limit the insulating plate 32 and the insulating member 14 during assembly, thereby ensuring the accuracy of the installation position; on the other hand, since both the insulating plate 32 and the insulating member 14 are insulating, multiple insulation is achieved by plugging the plug-in protrusion 142 with the plug-in groove 321, thereby increasing the insulation distance, preventing short circuits between the closing plate 31, the cover plate body and the metal parts inside the battery housing, and improving safety.

[0076] Alternatively, if Fig. 9As 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.

[0077] Alternatively, if Figure 6 As shown, the connecting piece 13 includes a first connecting portion 131 and a second connecting portion 132, the first connecting portion 131 is connected to the pole 12, the second connecting portion 132 is connected to the pole lug 200, and a through-slot 133 is provided on the second connecting portion 132, and the pole lug 200 passes through the through-slot 133 and is connected to the second connecting portion 132. By providing the through-slot 133 on the second connecting portion 132, the shortest path is provided for the pole lug 200 to pass over the connecting piece 13, 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.

[0078] Optionally, the cross section of the connecting piece 13 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 131 facing the cover body is lower than the surface of the second connecting portion 132 facing the cover body, so as to form a connecting piece 13 with a Z-shaped cross section. By making the surface of the second connecting portion 132 higher than the surface of the first connecting portion 131, the second connecting portion 132 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.

[0079] In addition, the connecting piece 13 and the pole 12 can be integrally formed by a molding process, or the connecting piece 13 and the pole 12 can be separately prepared and then welded during assembly. In this embodiment, the pole 12 and the connecting piece 13 are an integral structure, and a through groove 133 is provided on the second connecting portion 132 of the connecting piece 13.

[0080] 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 should 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 tabs on the same side, a shell module, a sealing module, a bottom sealing plate 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 to form an electrode group unit, and providing at most one fixed end plate hot-melted with the insulating film on the side of the electrode group with the electrode ear, and the fixed end plate is provided with an avoidance groove for the electrode ear to pass through; S2, the shell module comprises a shell body, a pole and a connecting piece, the shell body is a hollow shell structure with a single-side opening, and comprises a first wall surface opposite to the opening and a plurality of second walls arranged around the first wall surface, a connecting window communicating with the cavity is provided on the first wall surface, one end of the connecting piece is fixed to the first wall surface by the pole, and the other end of the connecting piece extends to below the connecting window, the pole group unit is installed into the cavity of the shell body, and the pole ear is bent so that the pole ear overlaps the surface of the connecting piece facing the connecting window; S3, welding the bottom sealing plate to the open portion of the outer shell body to seal the outer shell body; S4, welding the electrode tab and the connecting piece facing the connecting window; S5. The closed module includes a closed plate and an insulating plate, wherein the insulating plate is arranged on the side of the closed plate facing the pole ear, the closed plate is arranged at the connecting window of the first wall, and the closed plate is welded to the shell body.

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 S5, the following steps are also included: S51, a mounting boss is provided on a side of the first wall 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 a 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; S52, welding the closing portion to the first wall surface.

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 first wall surface 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 closed portion and the first wall are through-welded, a width dimension W satisfies 1 mm ≤ W ≤ 20 mm.

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 shell module also includes an insulating part, which is arranged on the side of the first wall facing the pole group and is provided with a through structure connected to the connection window. The side of the insulating plate facing away from the closing plate is provided with a plug-in groove, and the side of the insulating part facing the cover plate body is provided with a plug-in protrusion, 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.

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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