Battery assembly method and battery

Abstract

The application belongs to the technical field of batteries, and discloses a battery assembling method and a battery. In the battery assembling method, on the one hand, before the pole group enters the shell, an insulating film is wrapped on the surface of the pole group without the pole lug, and at most one fixed end plate is arranged on the surface of the pole group with the pole lug, so that the pole group is protected on at least five sides before entering the shell, and the pole group is prevented from being damaged when entering the shell, and the product quality is improved. On the other hand, the first wall surface and the second wall surface constituting the shell body are in an integrated structure, and the connecting window for welding the pole lug is arranged on the first wall surface. After the welding of the pole lug is completed, the first wall surface side does not need to be closed by welding operation to realize the closure of the shell body, so that the first wall surface side is prevented from being affected by the vibration, high temperature and other adverse factors generated by the welding operation when the welding of the pole lug is completed, the welding quality is improved, and the pole lug and the connecting piece are in a relatively stable state when the welding operation is performed, and the difficulty of welding is reduced.

Description

TECHNICAL FIELD

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

[0002] The square shell battery is constructed by the core component of the single-sided tabbed pole group. The traditional square shell battery assembling process usually first assembles the pole group into the battery shell, then bends the positive tab and the negative tab on the same side of the pole group multiple times to form an approximate S shape, then assembles the cover plate assembly connected with the pole post into the open end of the battery shell, and welds the tab with the corresponding polarity and the pole post. After the welding of the tab and the pole post is completed, the aluminum plate in the cover plate assembly is welded to the battery shell to close the battery shell, thereby completing the assembly of the square shell battery.

[0003] However, the square shell battery assembled by the method is prone to damage to the pole group due to the collision between the pole group and the battery shell when the pole group is assembled into the shell, thereby affecting the product quality. On the other hand, not only does the welding of the tab and the pole post need to be completed first, but also the vibration, high temperature and other adverse factors in the welding process of the aluminum plate and the battery shell can affect the welded tab and pole post, thereby reducing the welding quality between the pole post and the tab and affecting the conductivity efficiency. Moreover, the cover plate assembly and the battery shell are in a relatively free state during the welding of the tab and the pole post, which makes the operation difficult. SUMMARY

[0004] The present application aims to provide a battery assembling method and a battery with low operation difficulty, high welding quality and good protection.

[0005] To achieve this goal, the present application adopts the following technical solutions:

[0006] On the one hand, a battery assembling method is provided, and the battery assembled by the battery assembling method includes a tabbed pole group with tabs on the same side, a shell module, a closure module, a bottom sealing plate and at most one fixed end plate.

[0007] The battery assembling method includes the following steps:

[0008] S1, wrapping an insulating film on the outer side of the surface of the pole group where no tab is provided to form a pole group unit, and providing at most one fixed end plate on the side of the pole group where the tab is provided and hot melting with the insulating film, the fixed end plate being provided with an avoidance through slot for the tab to pass through;

[0009] S2, the shell module comprises a shell body, a pole and a connecting sheet, the shell body is a single-side open hollow shell structure, and comprises a first wall surface opposite to the opening and a plurality of second wall surfaces arranged around the first wall surface, a connecting window in communication with the cavity is formed in the first wall surface, one end of the connecting sheet is fixed to the first wall surface by the pole, and the other end of the connecting sheet extends to below the connecting window; the pole group unit is arranged in the cavity of the shell body, and the tab is bent to overlap the surface of the connecting sheet facing the connecting window;

[0010] S3, the bottom sealing plate is welded at the opening of the shell body to seal the shell body;

[0011] S4, the tab and the connecting sheet facing the connecting window are welded;

[0012] S5, the sealing module comprises a sealing plate and an insulating plate, the insulating plate is arranged on the side of the sealing plate facing the tab, the sealing plate is arranged at the connecting window of the first wall surface, and the sealing plate and the shell body are welded.

[0013] Optionally, in step S1, the following step is further included:

[0014] S11, the battery further comprises a bottom supporting plate, and the bottom supporting plate is pre-hot-melted at a set position of the insulating film;

[0015] S12, the insulating film is wrapped around the surface of the pole group without the tab, and the bottom supporting plate covers the surface of the pole group away from the tab.

[0016] Optionally, in step S5, the following step is further included:

[0017] S51, the side of the first wall surface away from the pole group is provided with a mounting boss, a mounting through hole in communication with the connecting window and arranged in a stepped distribution is formed on the mounting boss, a limiting step is formed between the mounting through hole and the connecting window, the sealing plate comprises a sealing part and a plug-in part, the insulating plate is arranged on the side of the plug-in part away from the sealing part, the plug-in part of the sealing plate is inserted into the connecting window, the sealing part of the sealing plate is inserted into the mounting through hole, and the sealing part abuts against the limiting step;

[0018] S52, the sealing part is welded with the first wall surface.

[0019] Optionally, the width dimension of the limiting step and the sealing part overlapping in the first direction is W, when the sealing part and the first wall surface are butt-welded, the width dimension W satisfies 0.5mm≤W≤20mm.

[0020] Optionally, when the closed part and the first wall surface are penetration welding, the width dimension W satisfies 1mm≤W≤20mm.

[0021] In another aspect, the application also provides a battery assembled by the battery assembling method.

[0022] Optionally, the shell module further comprises an insulating piece, the insulating piece is arranged on the side of the first wall surface facing the pole group, and a through structure in communication with the connecting window is arranged on the insulating piece, the side of the insulating piece away from the closed plate is provided with a plug-in groove, the side of the insulating piece facing the first wall surface 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 into the plug-in groove.

[0023] Optionally, the fixed end plate is further provided with a shaping extension edge, the shaping extension edge is arranged on the wall surface of the avoiding through groove, and the included angle between the extending direction of the shaping extension edge and the wall surface is an acute angle.

[0024] Optionally, the connecting piece comprises a first connecting part and a second connecting part, the first connecting part is connected with the pole column, the second connecting part is connected with the tab, a through slot is arranged on the second connecting part, and the tab passes through the through slot and is connected with the second connecting part.

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

[0026] The application has the following beneficial effects:

[0027] The application provides a battery assembling method, which, on one hand, wraps an insulating film on the surface of the pole group without the tab before the pole group enters the shell, and arranges at most one fixed end plate on the surface of the pole group with the tab, so that the pole group forms at least five protections before entering the shell, and the pole group is prevented from being damaged when entering the shell, and the product quality is improved, and on the other hand, the first wall surface and the second wall surface constituting the shell body are integrated, and the connecting window for realizing the tab welding operation is arranged on the first wall surface, so that the first wall surface side does not need to realize the closure of the shell body through the welding operation after the tab completes the welding process, thereby avoiding the tab on the first wall surface side from being affected by the vibration, high temperature and other adverse factors generated by the welding operation when the shell body is closed after the tab completes the welding operation, improving the welding quality, and making the tab and the connecting piece in a relatively stable state when the tab and the connecting piece are welded, and reducing the difficulty of the tab and the connecting piece when the tab and the connecting piece are welded.

[0028] The application also provides a battery, which has high electric conduction efficiency, high power supply capacity and high product quality by improving welding quality through the battery assembling method. BRIEF DESCRIPTION OF DRAWINGS

[0029] Figure 1 is a step flow chart of the battery assembling method provided by the application;

[0030] Figure 2 is a structure exploded view of the battery provided by the application;

[0031] Figure 3 is a partial sectional view of the first wall surface and the closed module of the battery provided by the application after assembly;

[0032] Figure 4 is a structure schematic view of the shell body in the shell module provided by the application;

[0033] Figure 5 is a structure enlarged view of part A in Figure 4

[0034] Figure 6 is a structure schematic view of the integral pole and the connecting sheet provided by the application;

[0035] Figure 7 is a structure schematic view of the insulating piece in the shell module provided by the application;

[0036] Figure 8 is a structure sectional view of the closed module in the battery provided by the application;

[0037] Figure 9 is a structure schematic view of the fixed end plate in the battery provided by the application.

[0038] In the drawings:

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

[0040] 1, shell module; 11, shell body; 111, first wall surface; 112, second wall surface; 113, connecting window; 114, mounting boss; 115, mounting through hole; 116, limiting step; 12, pole; 13, connecting sheet; 131, first connecting part; 132, second connecting part; 133, through slot; 14, insulating piece; 141, through structure; 142, plug-in protrusion;

[0041] 2, bottom sealing plate;

[0042] 3, closed module; 31, closed plate; 311, closed part; 312, plug-in part; 32, insulating plate; 321, plug-in groove;

[0043] ​4, fixed end plate; 41, avoiding through slot; 42, shaping extension;

[0044] 5, insulating film;

[0045] 6, bottom support plate. DETAILED DESCRIPTION

[0046] The application will be further described below in conjunction with the drawings and embodiments. It should be understood that the specific embodiments described herein are intended to be merely illustrative of the application and not in limitation thereof. It should also be noted that, for the purpose of brevity of description, only the parts of the drawings that are pertinent to the application are shown and described.

[0047] In the description of the present application, unless otherwise explicitly specified and limited, the terms "connected", "connected", "fixed" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0048] In the present application, unless otherwise explicitly specified and limited, the "upper" or "lower" of the first feature to the second feature can include the direct contact of the first and second features, or can include the contact of the first and second features through another feature between them. Moreover, the "upper", "upper" and "upper" of the first feature to the second feature includes the vertical and oblique above of the first feature to the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The "lower", "lower" and "lower" of the first feature to the second feature includes the vertical and oblique below of the first feature to the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0049] In the description of the present embodiment, the terms "upper", "lower", "right", and other orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the application. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0050] The traditional square shell battery is assembled in the following way. On the one hand, the welding step of the tab and the pole is located before the welding of the aluminum plate and the battery shell, which not only causes the tab and the pole that have been welded to be easily affected by the high temperature and vibration during the welding of the aluminum plate and the battery shell, but also makes the welding of the tab and the pole difficult to operate because the aluminum plate and the battery shell are in a relatively free state during the welding of the tab and the pole. On the other hand, the surface of the pole group lacks protection before entering the shell, which causes the pole group to be easily damaged when entering the shell, affecting the product quality.

[0051] Therefore, in order to reduce the operation difficulty during welding, improve the welding quality, and enhance the protection, the embodiment provides a battery assembly method. The battery assembled by the battery assembly method includes a pole group 100 with tabs 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] As shown in Figures 1 to 9 , the battery assembly method includes the following steps:

[0053] S1, wrapping an insulating film 5 on the outer side of the surface of the pole group 100 where no tab 200 is arranged to form a pole group unit, and arranging at most one fixed end plate 4 with a heat-fused insulating film 5 on the side of the pole group 100 where the tab 200 is arranged, the fixed end plate 4 being provided with an avoiding through slot 41 for the tab 200 to pass through;

[0054] S2, the shell module 1 includes a shell body 11, a pole 12, and a connecting piece 13. The shell body 11 is a single-side open hollow shell structure and includes a first wall surface 111 opposite to the opening and a plurality of second wall surfaces 112 arranged around the first wall surface 111. The first wall surface 111 is provided with a connecting window 113 communicating with the cavity. One end of the connecting piece 13 is fixed to the first wall surface 111 by the pole 12, and the other end of the connecting piece 13 extends below the connecting window 113. The pole group unit is arranged in the cavity of the shell body 11, and the tab 200 is bent so as to be overlapped on the surface of the connecting piece 13 facing the connecting window 113;

[0055] S3, welding the bottom sealing plate 2 at the opening of the shell body 11 to close the shell body 11;

[0056] S4, welding the tab 200 facing the connecting window 113 and the connecting piece 13;

[0057] S5, the closing module 3 includes a closing plate 31 and an insulating plate 32. The insulating plate 32 is arranged on the side of the closing plate 31 facing the tab 200. The closing plate 31 is arranged at the connecting window 113 of the first wall surface 111, and the closing plate 31 and the shell body 11 are welded.

[0058] This battery assembly method, on the one hand, involves wrapping an insulating film 5 around the surface of the electrode assembly 100 without tabs 200 before it is inserted into the casing, and setting at most one fixed end plate 4 on the side of the electrode assembly 100 with tabs 200. This provides at least five-sided protection for the electrode assembly 100 before it is inserted into the casing, preventing damage to the electrode assembly 100 during insertion and improving product quality. On the other hand, since the first wall surface 111 and the second wall surface 112 constituting the casing body 11 are an integral structure, and the first wall surface 111 has an opening for welding the tabs 200, this method also provides additional protection. The connection window 113 not only eliminates the need for welding operations to seal the outer shell 11 on the first wall 111 side after the electrode 200 has completed the welding process, thus avoiding the adverse effects of vibration, high temperature and other factors caused by the welding operation when the outer shell 11 is closed on the electrode 200 on the first wall 111 side after the welding operation is completed, thereby improving the welding quality, but also keeps the electrode 200 and the connecting piece 13 in a relatively stable state when welding, reducing the difficulty of welding the electrode 200 and the connecting piece 13.

[0059] The number of fixed end plates 4 on the side of the pole group 100 where the pole tabs 200 are located can be freely set according to requirements; they can be set to one or none.

[0060] In this embodiment, a fixed end plate 4 is provided on the side of the electrode assembly 100 where the electrode tab 200 is located. The fixed end plate 4 is heat-fused with the insulating film 5. The fixed end plate 4 and the insulating film 5 cooperate with each other to achieve six-sided protection of the electrode assembly 100 before it is inserted into the housing, thereby improving the protection performance of the electrode assembly 100 and preventing damage to the electrode assembly 100 when it is inserted into the housing, which would affect the product quality.

[0061] In other embodiments, if in order to reduce manufacturing costs, shorten assembly steps, and improve assembly efficiency, it is possible to omit the fixed end plate 4. In this case, before the electrode assembly 100 is inserted into the housing, a five-sided protective structure is formed by covering it with an insulating film 5.

[0062] Optionally, such as Figure 2 As shown, step S1 further includes the following steps:

[0063] S11, the battery also includes a base plate 6, which is pre-heat-melted onto the insulating film 5 at a predetermined position;

[0064] S12. Cover the insulating film 5 on the surface of the electrode group 100 where the tabs 200 are not provided, and make the base plate 6 cover the surface of the electrode group 100 away from the tabs 200.

[0065] By heat-melting the base plate 6 on the insulating film 5 before covering it, when the insulating film 5 is covered on the electrode assembly 100, the base plate 6 can cover the surface of the electrode assembly 100 and the tab 200 opposite to each other. This protects the surface of the electrode assembly 100 and the tab 200 opposite to each other when the electrode assembly 100 is put into the housing, thus preventing scratches during housing insertion.

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

[0067] S51. The first wall surface 111 is provided with a mounting boss 114 on the side away from the pole group 100. The mounting boss 114 is provided with mounting through holes 115 that communicate with the connection window 113 and are distributed in a stepped manner. A limiting step 116 is formed between the mounting through hole 115 and the connection window 113. The sealing plate 31 includes a sealing part 311 and a plug-in part 312. The insulating plate 32 is provided on the side of the plug-in part 312 away from the sealing part 311. The plug-in part 312 of the sealing plate 31 is inserted into the connection window 113, and the sealing part 311 of the sealing plate 31 is inserted into the mounting through hole 115, and the sealing part 311 abuts against the limiting step 116.

[0068] S52, Weld the closed part 311 to the first wall surface 111.

[0069] By setting a mounting boss 114 on the side of the first wall 111 away from the receiving cavity, and opening mounting through holes 115 on the mounting boss 114 that communicate with the connecting window 113 and are distributed in a stepped manner, the installation position of the sealing plate 31 is raised. On the one hand, more installation space is reserved for the electrode 200, which facilitates the subsequent welding of the electrode 200 and the connecting piece 13. On the other hand, the installation position of the electrode 200 in the height direction is improved, thereby further reducing the additional space occupied by the electrode 200 in the receiving cavity and further improving the space utilization rate.

[0070] Optionally, such as Figure 3 As shown, the width dimension of the overlap between the limiting step 116 and the closing part 311 along the first direction is W. When the closing part 311 and the first wall surface 111 are butt welded, the width dimension W satisfies 0.5mm≤W≤20mm.

[0071] When the closure part 311 and the first wall surface 111 are butt-welded, the width W of the overlap between the limiting step 116 and the closure part 311 along the first direction is limited to satisfy 0.5mm≤W≤20mm. On the one hand, this avoids the problem of a small overlap width, which could lead to defects such as weld breaks or explosions during butt-welding. On the other hand, it avoids the problem of an excessively large overlap width, which could increase the overall size of the outer shell body 11 and increase additional costs.

[0072] Optionally, as shown in Figure 3 The width dimension of the limiting step 116 and the closing part 311 along the first direction is W, when the closing part 311 and the first wall surface 111 are penetration welded, the width dimension W satisfies 1mm≤W≤20mm. By limiting the width dimension W of the limiting step 116 and the closing part 311 along the first direction when the closing part 311 and the first wall surface 111 are penetration welded, the width dimension W satisfies 1mm≤W≤20mm, on the one hand, it avoids that the overlapping width is too small, which leads to that the strength between the first wall surface 111 and the closing plate 31 is insufficient after penetration welding, and the pressure test of 1.2MPa is not met, on the other hand, it avoids that the overlapping width dimension is too large, which leads to that the overall size of the shell body 11 is increased, and the additional cost is increased.

[0073] In the embodiment, as shown in Figure 2 A battery is also provided, which is assembled by the above-mentioned battery assembling method. By applying the above-mentioned battery assembling method, the welding quality is improved, so that the battery has higher conduction efficiency, and the power supply capacity and product quality are improved.

[0074] Optionally, as shown in Figure 3 , Figure 7 , Figure 8 The shell module further comprises an insulating piece 14, the insulating piece 14 is arranged on the side of the first wall surface facing the pole group 100, and a penetrating structure 141 in communication with the connecting window is arranged on the insulating piece 14, the side of the insulating plate 32 away from the closing plate 31 is provided with a plug-in groove 321, and the side of the insulating piece 14 facing the first wall surface is provided with a plug-in protrusion 142, the plug-in protrusion 142 is continuously arranged around the circumferential edge of the penetrating structure 141, and the plug-in protrusion 142 is inserted into the plug-in groove 321.

[0075] By arranging the plug-in protrusion 142 on the insulating piece 14, arranging the plug-in groove 321 on the insulating plate 32, and inserting the plug-in groove 321 and the plug-in protrusion 142, on the one hand, the insulating plate 32 and the insulating piece 14 are positioned and limited during assembly, and the accuracy of the installation position is guaranteed, on the other hand, since the insulating plate 32 and the insulating piece 14 both have insulation, the insertion of the plug-in protrusion 142 and the plug-in groove 321 realizes multiple insulation, increases the insulation distance, prevents short circuit between the closing plate 31, the first wall surface and the metal parts inside the battery shell, and improves safety.

[0076] Optionally, as shown in Figure 9As shown, the fixed end plate 4 is further provided with a shaping extension 42, which is arranged on the wall surface of the avoiding through groove 41, and the included angle between the extending direction of the shaping extension 42 and the wall surface is an acute angle. By arranging the shaping extension 42 in the avoiding through groove 41 of the fixed end plate 4, and making the included angle between the extending direction of the shaping extension 42 and the wall surface of the avoiding through groove 41 an acute angle, the extending direction of the shaping extension 42 can be matched with the inclined surface of the folded tab 200, so as to fold and fix the folded tab 200, improve the folding state of the tab 200, and improve the folding effect.

[0077] Optionally, as shown, Figure 6 As shown, the connecting piece 13 comprises a first connecting part 131 and a second connecting part 132, the first connecting part 131 is connected with the pole 12, and the second connecting part 132 is connected with the tab 200, and the second connecting part 132 is provided with a through groove 133, and the tab 200 is connected with the second connecting part 132 through the through groove 133. By arranging the through groove 133 on the second connecting part 132, the shortest path is provided for the tab 200 to pass through the connecting piece 13, so that the length of the tab 200 is reduced, the space occupation of the tab 200 is reduced, and the space utilization is improved.

[0078] Optionally, the cross section of the connecting piece 13 is Z-shaped or straight line-shaped, so as to adapt to different specifications and models of the battery. In the embodiment, the surface of the first connecting part 131 towards the first wall surface is lower than the surface of the second connecting part 132 towards the first wall surface, so as to form the connecting piece 13 with the Z-shaped cross section. By making the surface of the second connecting part 132 higher than the surface of the first connecting part 131, the connecting position of the tab 200 is raised by the second connecting part 132, so as to further reduce the additional space occupation of the tab 200 in the accommodating cavity, and the space utilization is further improved.

[0079] In addition, the connecting piece 13 and the pole 12 can be integrally formed by a forming process, or the connecting piece 13 and the pole 12 can be separately prepared, and then welded when assembled. In the embodiment, the pole 12 and the connecting piece 13 are an integrated structure, and the through groove 133 is arranged on the second connecting part 132 of the connecting piece 13.

[0080] Obviously, the above embodiments of the present application are only examples for clearly illustrating the present application, and are not intended to limit the implementation modes of the present application. For those skilled in the art, various obvious changes, re-adjustments and substitutions can be made without departing from the protection scope of the present application. It is unnecessary and impossible to enumerate all the implementation modes. Any modification, equivalent substitution and improvement made within the spirit and principle of the present application shall be included in the protection scope of the claims of the present application.

Claims

1. A battery assembly method, characterized in that, The battery assembled using the battery assembly method includes a pole group with tabs on the same side, a housing module, a sealing module, a bottom sealing plate, and at most one fixed end plate. The battery assembly method includes the following steps: S1. An insulating film is wrapped around the outer surface of the electrode group without the electrode tab to form an electrode group unit, and at most one fixed end plate is provided on the side of the electrode group with the electrode tab that is heat-fused with the insulating film. The fixed end plate is provided with a clearance groove for the electrode tab to pass through. S2. The outer shell module includes an outer shell body, a pole post, and a connecting piece. The outer shell body is a hollow shell structure with a single-sided opening, and includes a first wall opposite to the opening and a plurality of second walls surrounding the first wall. A connection window communicating with the cavity is opened on the first wall. One end of the connecting piece is fixed to the first wall by the pole post, and the other end of the connecting piece extends to below the connection window. The pole assembly unit is installed into the cavity of the outer shell body, and the pole tab is bent so that the pole tab overlaps the surface of the connecting piece facing the connection window. S3. Weld the bottom sealing plate to the opening of the outer shell body to close the outer shell body; S4. Perform welding operations on the electrode tabs and connecting pieces facing the connection window; S5. The enclosed module includes an enclosed plate and an insulating plate. The insulating plate is disposed on the side of the enclosed plate facing the electrode tab. The enclosed plate is disposed at the connection window of the first wall surface, and the enclosed plate is welded to the outer shell body. Step S5 also includes the following steps: S51. A mounting boss is provided on the side of the first wall facing away from the pole group. The mounting boss has mounting through holes that communicate with the connection window and are distributed in a stepped manner. A limiting step is formed between the mounting through holes and the connection window. The sealing plate includes a sealing part and a plug-in part. The insulating plate is provided on the side of the plug-in part facing away from the sealing part. The plug-in part of the sealing plate is inserted into the connection window. The sealing part of the sealing plate is inserted into the mounting through hole and the sealing part abuts against the limiting step. S52. Weld the closed portion to the first wall surface; The width dimension of the overlap between the limiting step and the closed part along the first direction is W. When the closed part and the first wall surface are welded together, the width dimension W satisfies 0.5mm≤W≤20mm. When the closed portion is welded to the first wall surface through the weld, the width dimension W satisfies 1mm≤W≤20mm; The outer casing module also includes an insulating component. The insulating component is disposed on the side of the first wall facing the pole group and has a through structure communicating with the connection window. The insulating plate has a plug-in groove on the side away from the sealing plate, and the insulating component has a plug-in protrusion on the side facing the first wall. The plug-in protrusion is continuously arranged around the circumferential edge of the through structure and is inserted into the plug-in groove. The fixed end plate is also provided with a shaping extension edge, which is provided on the wall surface of the clearance groove, and the angle between the direction of the shaping extension edge and the wall surface is an acute angle.

2. The battery assembly method according to claim 1, characterized in that, Step S1 also includes the following steps: S11. The battery also includes a base plate, which is pre-heat-melted at a predetermined position on the insulating film. S12. The insulating film is wrapped around the surface of the electrode group where the tabs are not provided, and the base plate is used to cover the surface of the electrode group away from the tabs.

3. A battery, characterized in that, The battery is assembled using the battery assembly method as described in any one of claims 1-2.

4. The battery according to claim 3, characterized in that, The connecting piece includes a first connecting part and a second connecting part. The first connecting part is connected to the pole post, and the second connecting part is connected to the pole tab. The second connecting part has a through-slot, and the pole tab passes through the through-slot and connects to the second connecting part.

5. The battery according to claim 3, characterized in that, The cross-section of the connecting piece is Z-shaped or straight.

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