Battery assembly method and battery

Abstract

This invention belongs to the field of battery technology and discloses a battery assembly method and a battery. The battery assembly method first assembles a first cover plate module into the opening of the outer shell body, and bends the tabs opposite to the first cover plate module so that the tabs overlap the surface of the connecting piece located below the connecting window. Next, the outer shell body is sealed. Finally, the tabs and connecting pieces are welded using the connecting window to achieve current conduction between the tabs and the terminals. Thus, the step of connecting the tabs to the terminals through the connecting piece is placed after the step of sealing the outer shell body. On the one hand, this avoids the impact of vibration, high temperature and other adverse factors during the welding process on the already welded tabs and terminals when the outer shell body is sealed, thus improving the welding quality between the terminals and tabs. On the other hand, since the first cover plate module and the outer shell body are in a fixed state, the difficulty of welding the tabs and connecting pieces is reduced.

Description

TECHNICAL FIELD

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

[0002] The blade battery is constructed by the core component of the pole group with the pole lug on both sides. The traditional blade battery assembling process usually firstly assembles the pole group into the battery shell, then bends the pole lug on both sides of the pole group for multiple times to form the approximate S type, and then respectively assembles the cover plate assembly connected with the pole post into both sides of the battery shell, and makes the pole lug and the pole post welded. After the pole lug and the pole post complete the welding work, the battery shell and the aluminum plate in the cover plate assembly on both sides are welded, the battery shell is closed, and the assembly of the blade battery is completed.

[0003] However, the blade battery assembled by the method needs to complete the welding of the pole lug and the pole post first, which leads to the influence of the vibration and high temperature in the welding process on the pole lug and the pole post which have been welded, reduces the welding quality between the pole post and the pole lug, and affects the conductivity. On the other hand, in order to ensure the welding quality of the pole lug and the pole post, the relative stability between the pole lug and the pole post needs to be ensured. However, since the welding of the cover plate assembly and the battery shell is after the welding of the pole post and the pole lug, the cover plate assembly and the battery shell are in a relatively free state, which leads to the difficulty in the operation of welding the pole lug and the pole post. SUMMARY

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

[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 pole group with the pole lug on both sides, a shell body, a first cover plate module and a closing module.

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

[0008] S1, taking the pole group as the core, preparing a shell entering unit, the shell body is a double-side open structure with a cavity, assembling the shell entering unit into the cavity of the shell body, and closing any side opening of the shell body;

[0009] S2, the first cover plate module is arranged at the opening of the shell body, the first cover plate module comprises a first cover plate body, a first pole and a connecting piece, the first cover plate body is provided with a connecting window communicating with the cavity of the shell body, one end of the connecting piece is fixed on the first cover plate body by the first pole, the other end of the connecting piece extends to below the connecting window, the tab opposite to the first cover plate body is bent, and the tab is overlapped on the surface of the connecting piece facing the connecting window;

[0010] S3, the structure closing the openings of the shell body is finally welded with the shell body;

[0011] S4, the tab facing the connecting window is welded with the connecting piece;

[0012] S5, the closing module comprises a closing plate and an insulating plate, the insulating plate is arranged on the side of the closing plate facing the tab, the closing plate is arranged at the connecting window of the first cover plate body, and the closing plate is welded with the first cover plate body.

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

[0014] S11, the pole group comprises a first surface and a second surface provided with the tab, and a plurality of side surfaces perpendicular to the first surface and the second surface, and an insulating film is wrapped on the plurality of side surfaces of the pole group;

[0015] S12, the battery further comprises at least one fixed end plate, the fixed end plate is provided with a avoiding through slot for the tab to pass through, and at most one fixed end plate is arranged on the first surface and is hot-melted with the insulating film;

[0016] S13, the battery further comprises at most one second cover plate module, at most one fixed end plate, at most one second cover plate module or at most one first cover plate module is arranged on the second surface and is hot-melted with the insulating film, so as to form the shell-in unit, the first cover plate module or the second cover plate module is preliminarily welded with the shell body, so as to close the opening opposite to the second surface of the shell body.

[0017] Optionally, in step S13, when the fixed end plate is arranged on the second surface and is hot-melted with the insulating film, and the first cover plate module is used to close the opening opposite to the second surface of the shell body, step S13 comprises the following steps:

[0018] S131A, the fixed end plate is arranged on the second surface and the insulating film is hot melted, and the lug on the second surface passes through the avoiding through slot of the fixed end plate to form the cell-in-shell unit;

[0019] S132A, the cell-in-shell unit is arranged in the cavity of the shell body;

[0020] S133A, the first cover plate body provided with the connecting window is arranged on the open side opposite to the second surface, and the lug of the second surface passing through the avoiding through slot is bent to be overlapped on the surface of the connecting piece facing the connecting window;

[0021] S134A, the first cover plate body is spot welded with the shell body to complete the preliminary connection of the first cover plate module and the shell body.

[0022] Optionally, in step S13, when the fixed end plate is arranged on the second surface and the insulating film is hot melted, and the second cover plate module is arranged on the open side opposite to the second surface of the shell body, step S13 further comprises the following steps:

[0023] S131B, the fixed end plate is arranged on the second surface and the insulating film is hot melted, and the lug on the second surface passes through the avoiding through slot of the fixed end plate to form the cell-in-shell unit;

[0024] S132B, the cell-in-shell unit is arranged in the cavity of the shell body;

[0025] S133B, the second cover plate module comprises a second cover plate body and a second pole, the second pole is fixedly connected to the second cover plate body, the second cover plate body connected with the second pole is arranged on the open side opposite to the second surface, and the lug of the second surface passing through the avoiding through slot is bent to connect the lug of the second surface to the side of the second pole facing the pole group;

[0026] S134B, the second cover plate body is spot welded with the shell body to complete the preliminary connection of the second cover plate module and the shell body.

[0027] Optionally, in step S13, when the first cover plate module is arranged on the second surface and the insulating film is hot melted, step S13 further comprises the following steps:

[0028] S131C, the first cover plate module further comprises a first insulating piece, the first insulating piece is provided with a through structure in communication with the connecting window, the first insulating piece is arranged on the side of the first cover plate body facing the pole group, the first cover plate body is arranged on the second surface, the pole lug of the second surface is bent, the pole lug is overlapped on the surface of the connecting piece facing the through structure, the first insulating piece is hot-melted with the insulating film, so as to form the cell-in-shell unit;

[0029] S132C, the cell-in-shell unit is arranged in the cavity of the shell body, and the first cover plate body closes the opening of the shell body opposite to the second surface;

[0030] S133C, the first cover plate body is spot-welded with the shell body, and the preliminary connection of the first cover plate module and the shell body is completed.

[0031] Optionally, in step S13, when the second cover plate module is arranged on the second surface and hot-melted with the insulating film, step S13 further comprises the following steps:

[0032] S131D, the second cover plate module comprises a second cover plate body, a second insulating piece and a second pole column, the second insulating piece is arranged on the side of the second cover plate body facing the pole group, one end of the second pole column is fixedly connected to the second cover plate body, the other end of the second pole column passes through the second insulating piece, the second cover plate body is arranged on the second surface, the pole lug of the second surface is bent, the pole lug is connected to one end of the second pole column passing through the second insulating piece, and the second insulating piece is hot-melted with the insulating film, so as to form the cell-in-shell unit;

[0033] S132D, the cell-in-shell unit is arranged in the cavity of the shell body, and the second cover plate body closes the opening of the shell body opposite to the second surface;

[0034] S133D, and the second cover plate body is spot-welded with the shell body, and the preliminary connection of the second cover plate module and the shell body is completed.

[0035] Optionally, in step S11, the following steps are further included:

[0036] S111, the battery further comprises at least one protective side plate, and the at least one protective side plate is hot-melted at a set position of the insulating film in advance;

[0037] S112, the insulating film is wrapped on the plurality of side surfaces of the pole group, and the at least one protective side plate covers one of the side surfaces of the pole group.

[0038] Optionally, in step S5, the following steps are further included:

[0039] S51, a mounting boss is arranged on the side of the first cover plate body away from the pole group, a mounting through hole in communication with the connecting window and arranged in a stepped distribution is arranged on the mounting boss, a limiting step is formed between the mounting through hole and the connecting window, the closure plate includes a closure part and a plug-in part, the insulating plate is arranged on the side of the plug-in part away from the closure part, the plug-in part of the closure plate is inserted into the connecting window, the closure part of the closure plate is inserted into the mounting through hole, and the closure part is abutted with the limiting step;

[0040] S52, the closure part is welded with the first cover plate body, the width dimension of the limiting step overlapping with the closure part in the first direction is W, when the closure part is butt welded with the first cover plate body, the width dimension W satisfies 0.5mm≤W≤20mm.

[0041] Optionally, when the closure part is penetration welded with the first cover plate body, the width dimension W satisfies 1mm≤W≤20mm.

[0042] On the other hand, a battery is also provided, which is assembled by the battery assembling method as any one of the above.

[0043] The beneficial effects of the present application are as follows:

[0044] The present application provides a battery assembling method, which sets a first cover plate module with a connecting window at the opening of a shell body, so that when assembling, the welding process of closing the openings on both sides of the shell body is located before the welding process of the tab and the connecting piece, thereby on the one hand, avoiding the influence of the tab and the connecting piece which have been welded due to vibration, high temperature and other adverse factors in the welding process when the shell body is closed and welded, improving the welding quality between the tab and the connecting piece, on the other hand, since the first cover plate module and the shell body are in a fixed state, the difficulty of the welding operation of the tab and the connecting piece is reduced.

[0045] The present application also provides a battery, which improves the welding quality by applying the above-mentioned battery assembling method, thereby ensuring higher conductivity efficiency, improving power supply capacity and product quality. BRIEF DESCRIPTION OF DRAWINGS

[0046] Figure 1 is a step flow chart of the battery assembling method provided by the present application;

[0047] Figure 2 is an assembly drawing of the first cover plate module, the closure module and the fixed end plate in the battery provided by the present application;

[0048] Figure 3 is the assembly view of the first cover plate module, the closing module and the fixed end plate in the battery provided by the application;

[0049] Figure 4 is the structural schematic view of the first cover plate body in the first cover plate module provided by the application;

[0050] Figure 5 is Figure 4 is the structural enlarged view of part A in the figure;

[0051] Figure 6 is the structural schematic view of the first insulation piece in the first cover plate module provided by the application;

[0052] Figure 7 is the structural exploded view of the closing module in the battery provided by the application;

[0053] Figure 8 is the structural schematic view of the fixed end plate in the battery provided by the application;

[0054] Figure 9 is the assembly view of the second cover plate module in the battery provided by the application;

[0055] Figure 10 is the structural schematic view of the shell body in the battery provided by the application.

[0056] In the figure:

[0057] 1, shell body;

[0058] 2, first cover plate module; 21, first cover plate body; 211, connecting window; 212, mounting boss; 213, mounting through hole; 214, limiting step; 22, first pole; 23, connecting piece; 24, first insulation piece; 241, through structure;

[0059] 3, closing module; 31, closing plate; 311, closing part; 312, plug-in part; 32, insulation plate;

[0060] 4, fixed end plate; 41, avoiding through slot;

[0061] 5, second cover plate module; 51, second cover plate body; 52, second pole; 53, second insulation piece. DETAILED DESCRIPTION

[0062] The application will be further described in detail below in combination with the drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the application, but not to limit the application. In addition, it should be noted that, in order to facilitate the description, only the parts related to the application are shown in the drawings, but not all the structures.

[0063] In the description of this invention, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0064] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0065] In the description of this embodiment, the terms "upper," "lower," "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention. In addition, the terms "first" and "second" are used only for distinction in description and have no special meaning.

[0066] Example 1

[0067] In the assembly of traditional blade batteries, the welding of the tabs and terminals takes place before the welding of the aluminum plate to the battery casing. This makes the already welded tabs and terminals susceptible to the high temperature and vibration during the welding process. Furthermore, the aluminum plate and battery casing are in a relatively free state during the welding of the tabs and terminals, making the welding process more difficult and less efficient.

[0068] Therefore, in order to reduce the difficulty of welding operations and improve welding quality, this embodiment provides a battery assembly method. The battery assembled by the battery assembly method includes an electrode group with tabs on both sides, a housing body, a first cover plate module, and a sealing module.

[0069] like Figures 1 to 10 As shown, the battery assembly method includes the following steps:

[0070] S1, taking the pole group as the core, preparing a shell entering unit, the shell body 1 is a double-sided open structure with a cavity, the shell entering unit is loaded into the cavity of the shell body 1, and any side opening of the shell body 1 is closed;

[0071] S2, the first cover plate module 2 is arranged at the opening of the shell body 1 which is not closed, the first cover plate module 2 comprises a first cover plate body 21, a first pole 22 and a connecting piece 23, the first cover plate body 21 is provided with a connecting window 211 which is in communication with the cavity of the shell body 1, one end of the connecting piece 23 is fixed to the first cover plate body 21 by the first pole 22, the other end of the connecting piece 23 extends to below the connecting window 211, the tab opposite to the first cover plate body 21 is bent and overlapped on the surface of the connecting piece 23 facing the connecting window 211;

[0072] S3, the structure closing the openings of the two sides of the shell body 1 is finally welded with the shell body 1;

[0073] S4, the tab facing the connecting window 211 is welded with the connecting piece 23;

[0074] S5, the closing module 3 comprises 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, the closing plate 31 is arranged at the connecting window 211 of the first cover plate body 21, and the closing plate 31 is welded with the first cover plate body 21.

[0075] The battery assembling method sets the first cover plate module 2 with the connecting window 211 at the opening of the shell body 1, so that when assembling, the welding process of closing the openings of the two sides of the shell body 1 is before the welding process of the tab and the connecting piece 23, thereby on the one hand, the welding quality between the tab and the connecting piece 23 is improved by avoiding the influence of the tab and the connecting piece 23 which have been welded by the vibration and high temperature in the welding process when the shell body 1 is closed, on the other hand, the difficulty of the welding operation of the tab and the connecting piece 23 is reduced because the first cover plate module 2 and the shell body 1 are in a fixed state.

[0076] Optionally, as shown in Figure 1 , Figure 3 , in step S1, the following steps are further included:

[0077] S11, the pole group comprises a first surface and a second surface provided with a tab, and a plurality of side surfaces perpendicular to the first surface and the second surface, and the insulating film is wrapped on the plurality of side surfaces of the pole group;

[0078] S12, the battery further comprises at least one fixed end plate 4, the fixed end plate 4 is provided with a avoiding through slot 41 for the tab to pass through, at most one fixed end plate 4 is arranged on the first surface and is hot-melted with the insulating film.

[0079] S13, the battery further comprises a second cover plate module 5, at most one fixed end plate 4, or at most one second cover plate module 5, or at most one first cover plate module 2 is arranged on the second surface and is hot melt with the insulating film, so as to form a cell entry unit, and the first cover plate module 2 or the second cover plate module 5 is primarily welded with the shell body 1, so as to close the opening opposite to the second surface of the shell body 1.

[0080] By wrapping the insulating film on the plurality of sides of the pole group, the pole group is protected on four sides, and by arranging at most one fixed end plate 4 on the first surface and hot melt with the insulating film, at most one fixed end plate 4 or at most one second cover plate module 5 or at most one first cover plate module 2 on the second surface and hot melt with the insulating film, a layer of protection is added on the first surface and / or the second surface, and cooperates with the insulating film wrapped on the sides of the pole group to form a cell entry unit with at least five layers of protection, so as to ensure the protection of the pole group when entering the shell and avoid damage to the pole group when entering the shell, and ensure product quality.

[0081] In step S13 of the embodiment one, when the fixed end plate 4 is arranged on the second surface and hot melt with the insulating film, and the first cover plate module 2 is used to close the opening opposite to the second surface of the shell body 1, step S13 comprises the following steps:

[0082] S131A, the fixed end plate 4 is arranged on the second surface and hot melt with the insulating film, and the pole lug on the second surface passes through the avoidance through slot 41 of the fixed end plate 4, so as to form a cell entry unit;

[0083] S132A, the cell entry unit is arranged in the cavity of the shell body 1;

[0084] S133A, the first cover plate body 21 provided with the connecting window 211 is arranged on the side of the opening opposite to the second surface, and the pole lug on the second surface passing through the avoidance through slot 41 is bent to make the pole lug lap on the surface of the connecting piece 23 facing the connecting window 211;

[0085] S134A, the first cover plate body 21 is spot welded with the shell body 1, and the primary connection of the first cover plate module 2 and the shell body 1 is completed.

[0086] By arranging the fixed end plate 4 on the second surface and hot melt with the insulating film, the second surface is protected, so that whether the fixed end plate 4 is arranged on the first surface or not, the cell entry unit with at least five layers of protection for the pole group can be formed, so as to avoid damage to the pole group when entering the shell.

[0087] In the embodiment, the first surface is also provided with the fixed end plate 4, so that the first surface and the second surface of the pole group are both provided with the fixed end plate 4 which is hot melt connected with the insulation film, thereby forming a shell-entering unit with six-sided protection, and the pole group has high protection performance. In addition, the first cover plate module 2 is used to close the opening of the shell body 1 opposite to the second surface, so that the pole lug on the second surface and the connecting piece 23 are located in the welding process after the first cover plate body 21 and the shell body 1 are welded, so that the pole lug on the second surface is the same as the pole lug on the first surface, that is, the pole lug and the connecting piece 23 which have been welded are not affected by the vibration and high temperature in the welding process when the shell body 1 is closed, the welding quality between the connecting piece 23 and the pole lug is improved, and since the first cover plate module 2 and the shell body 1 are in a fixed state, the difficulty of welding the pole lug and the connecting piece 23 is reduced.

[0088] Therefore, after the assembly steps of the first embodiment are completed, the battery structure with two first cover plate modules 2 and two fixed end plates 4 is formed, which not only has a shell-entering unit with six-sided protection and high protection performance, but also ensures high welding quality of the pole lug on both sides.

[0089] Optionally, in step S11, the following steps are further included:

[0090] S111, the battery further includes at least one protection side plate, and the at least one protection side plate is pre-hot melt at a set position of the insulation film;

[0091] S112, the insulation film is wrapped on multiple sides of the pole group, and the at least one protection side plate covers one side of the pole group.

[0092] By hot melting the protection side plate on the insulation film before wrapping the insulation film, the protection side plate can cover the side of the pole group when the insulation film is wrapped on the pole group, so that the side of the pole group is protected by the protection side plate when the pole group enters the shell, and scratches during entering the shell are avoided.

[0093] The number of protection side plates can be freely set according to the protection requirement, and in the embodiment, four protection side plates are provided, which correspond to the four sides of the pole group one by one, thereby improving the protection performance of the pole group.

[0094] Optionally, as shown in steps S5 and S6, Figure 3 , Figure 5 the following steps are further included in step S5:

[0095] S51, the side of the first cover plate body 21 away from the pole group is provided with a mounting boss 212, the mounting boss 212 is provided with a mounting through hole 213 in communication with the connecting window 211 and in a stepped distribution, and a limiting step 214 is formed between the mounting through hole 213 and the connecting window 211, the closing plate 31 comprises a closing part 311 and a plug-in part 312, and the insulating plate 32 is arranged on the side of the plug-in part 312 away from the closing part 311, the plug-in part 312 of the closing plate 31 is inserted into the connecting window 211, the closing part 311 of the closing plate 31 is inserted into the mounting through hole 213, and the closing part 311 abuts against the limiting step 214;

[0096] S52, the closing part 311 is welded with the first cover plate body 21, and the width dimension W of the limiting step 214 overlapping the closing part 311 in the first direction is 0.5mm≤W≤20mm.

[0097] When the closing part 311 is welded with the first cover plate body 21 by butt joint, the width dimension W of the limiting step 214 overlapping the closing part 311 in the first direction is limited to satisfy 0.5mm≤W≤20mm, which on the one hand avoids that the overlapping width is too small to cause the phenomenon of incomplete welding, spatter and other adverse phenomena during butt joint welding, and on the other hand avoids that the overlapping width dimension is too large to increase the overall size of the first cover plate module 2 and increase the additional cost.

[0098] Optionally, as shown in Figure 3 , Figure 5 the width dimension W of the limiting step 214 overlapping the closing part 311 in the first direction is 1mm≤W≤20mm when the closing part 311 is welded with the first cover plate body 21 by penetration welding. When the closing part 311 is welded with the first cover plate body 21 by penetration welding, the width dimension W of the limiting step 214 overlapping the closing part 311 in the first direction is limited to satisfy 1mm≤W≤20mm, which on the one hand avoids that the overlapping width is too small to cause the strength between the first cover plate body 21 and the closing plate 31 to be insufficient after penetration welding, and the pressure test of 1.2MPa is not satisfied, and on the other hand avoids that the overlapping width dimension is too large to increase the overall size of the first cover plate module 2 and increase the additional cost.

[0099] Embodiment two

[0100] For the sake of simplicity, the same or corresponding parts of embodiment two and embodiment one adopt the corresponding reference signs of embodiment one, and only the difference between embodiment two and embodiment one is described, which is that in step S12, no fixed end plate 4 is arranged on the first surface.

[0101] Therefore, after the assembling step of the embodiment two is completed, a battery structure with two first cover plate modules 2 and one fixed end plate 4 arranged on the second surface is formed, at this time, the fixed end plate 4 on the second surface and the insulation film form a five-protected shell entering unit, compared with the embodiment one, the protection performance is reduced, but the number of parts is reduced, the cost is reduced, the assembling process is reduced, and the assembling efficiency is improved.

[0102] Embodiment three

[0103] For the sake of simplicity, the same or corresponding parts of the embodiment three and the embodiment one are marked with the corresponding reference numerals of the embodiment one, and only the difference between the embodiment three and the embodiment one is described, the difference is that the step S13 in the embodiment three is different from the step S13 in the embodiment one.

[0104] In the step S13 of the embodiment three, when the fixed end plate 4 is arranged on the second surface and is hot melt connected with the insulation film, and the open side of the shell body 1 opposite to the second surface is closed by the second cover plate module 5, at this time, the step S13 includes the following steps:

[0105] S131B, arranging the fixed end plate 4 on the second surface and hot melt connecting with the insulation film, and making the tab on the second surface pass through the avoiding through slot 41 of the fixed end plate 4, so as to form a shell entering unit;

[0106] S132B, arranging the shell entering unit into the cavity of the shell body 1;

[0107] S133B, the second cover plate module 5 includes a second cover plate body 51 and a second pole 52, the second pole 52 is fixedly connected to the second cover plate body 51, the second cover plate body 51 connected with the second pole 52 is arranged on the open side opposite to the second surface, and the tab of the second surface passing through the avoiding through slot 41 is bent, so that the tab of the second surface is connected to the side of the second pole 52 facing the pole group;

[0108] S134B, spot welding the second cover plate body 51 and the shell body 1, and completing the preliminary connection of the second cover plate module 5 and the shell body 1.

[0109] The second cover plate module 5 is a cover plate assembly of a traditional blade battery, and its type can be a traditional welded cover plate, a riveted cover plate or a minimalist cover plate, etc. In the embodiment three, the second cover plate module 5 is a traditional riveted cover plate.

[0110] In the embodiment, the first surface is also provided with the fixed end plate 4, so that the first surface and the second surface of the pole group are both provided with the fixed end plate 4 which is hot melt connected with the insulation film, thereby forming the shell-entering unit with six-face protection, and the pole group has high protection performance. In addition, since the opening opposite to the first surface of the shell body 1 is closed by the first cover plate module 2, while ensuring that the tab on one side of the pole group has high welding quality, the opening opposite to the second surface of the shell body 1 is closed by the second cover plate module 5 with mature process, thereby helping to control the manufacturing cost while improving the welding quality and welding convenience of the tab on one side.

[0111] Therefore, after the assembly steps of the embodiment three are completed, the battery structure with one first cover plate module 2, one second cover plate module 5 and two fixed end plates 4 is formed, which not only has the shell-entering unit with six-face protection and high protection performance, but also ensures that the tab on one side of the pole group has high welding quality.

[0112] Embodiment four

[0113] For the sake of simplicity, the same or corresponding parts of the embodiment four and the embodiment three adopt the corresponding reference numerals of the embodiment three, and only the difference between the embodiment four and the embodiment three is described, which is that in step S12, the first surface is not provided with the fixed end plate 4.

[0114] Therefore, after the assembly steps of the embodiment four are completed, the battery structure with one first cover plate module 2, one second cover plate module 5 and one fixed end plate 4 provided on the second surface is formed, and at this time, the fixed end plate 4 on the second surface and the insulation film form the shell-entering unit with five-face protection, which has lower protection performance compared with the embodiment three, but reduces the number of parts, reduces the cost, shortens the assembly process and improves the assembly efficiency.

[0115] Embodiment five

[0116] For the sake of simplicity, the same or corresponding parts of the embodiment five and the embodiment one adopt the corresponding reference numerals of the embodiment one, and only the difference between the embodiment five and the embodiment one is described, which is that the step S13 in the embodiment one is different from the step S13 in the embodiment three.

[0117] In the step S13 of the embodiment five, when the first cover plate module 2 which is hot melt connected with the insulation film is provided on the second surface, at this time, the step S13 includes the following steps:

[0118] S131C, the first cover plate module 2 further comprises a first insulating piece 24, the first insulating piece 24 is provided with a through structure 241 communicating with the connecting window 211, the first insulating piece 24 is arranged on the side of the first cover plate body 21 facing the pole group, the first cover plate body 21 is arranged on the second surface, and the tab on the second surface is bent to overlap the surface of the connecting piece 23 facing the through structure 241, and the first insulating piece 24 is hot-melted with the insulating film to form a cell-in-shell unit;

[0119] S132C, the cell-in-shell unit is arranged in the cavity of the shell body 1, and the first cover plate body closes the opening of the shell body opposite to the second surface;

[0120] S133C, the first cover plate body 21 is spot-welded with the shell body 1 to complete the preliminary connection of the first cover plate module 2 and the shell body 1.

[0121] By arranging the first cover plate module 2 hot-melted with the insulating film on the second surface, the second surface is protected, so that whether the first surface is provided with the fixed end plate 4 or not, the cell-in-shell unit with at least five surface protection can be formed, so that damage to the pole group during cell-in-shell is avoided.

[0122] In the embodiment, the first surface is provided with the fixed end plate 4, so that the first surface of the pole group is protected by the fixed end plate 4, and the second surface of the pole group is protected by the first cover plate module 2, and the insulating film wrapped on the side surface, so as to form a cell-in-shell unit with six surface protection, which has high protection performance for the pole group. In addition, the first cover plate module 2 closes the opening of the shell body 1 opposite to the second surface, so that the tab on the second surface and the connecting piece 23 are also located after the welding process of the first cover plate body 21 and the shell body 1, so that the tab on the second surface is the same as the tab on the first surface, that is, the tab and the connecting piece 23 that have completed the welding are not affected by the vibration and high temperature in the welding process, which improves the welding quality between the connecting piece 23 and the tab. Since the first cover plate module 2 and the shell body 1 are in a fixed state, the difficulty of welding the tab and the connecting piece 23 is reduced.

[0123] Therefore, after the assembly steps of the fifth embodiment are completed, a battery structure with two first cover plate modules 2 and a fixed end plate 4 arranged on the first surface is formed, which not only has a cell-in-shell unit with six surface protection and high protection, but also ensures high welding quality of the tabs on both sides.

[0124] Embodiment six

[0125] Wherein for the sake of simplicity, the same or corresponding parts of embodiment six and embodiment five are denoted by the same reference numerals, and only the difference between embodiment six and embodiment five is described, which is that in step S12, no fixed end plate 4 is arranged on the first surface.

[0126] Therefore, after the assembly steps of embodiment six are completed, a battery structure with two first cover plate modules 2 but without fixed end plate 4 is formed, at this time, the first cover plate module 2 on the second surface and the insulation film form a shell-entering unit with five-surface protection, which has lower protection performance compared with embodiment five, but reduces the number of parts, reduces the cost, reduces the assembly process, and improves the assembly efficiency.

[0127] Embodiment seven

[0128] Wherein for the sake of simplicity, the same or corresponding parts of embodiment seven and embodiment one are denoted by the same reference numerals, and only the difference between embodiment seven and embodiment one is described, which is that step S13 in embodiment seven is different from step S13 in embodiment one.

[0129] In step S13 of this embodiment seven, when the second cover plate module 5 is arranged on the second surface and is hot melt connected with the insulation film, at this time, step S13 includes the following steps:

[0130] S131D, the second cover plate module 5 includes a second cover plate body 51, a second insulation piece 53, and a second pole 52, the second insulation piece 53 is arranged on the side of the second cover plate body 51 facing the pole group, one end of the second pole 52 is fixedly connected to the second cover plate body 51, the other end of the second pole 52 passes through the second insulation piece 53, the second cover plate body 51 is arranged at the second surface, and the tab of the second surface is bent to connect the tab to the one end of the second pole 52 passing through the second insulation piece 53, and the second insulation piece 53 is hot melt connected with the insulation film to form a shell-entering unit;

[0131] S132D, the shell-entering unit is arranged in the cavity of the shell body 1, and the second cover plate body 51 closes the opening of the shell body 1 opposite to the second surface;

[0132] S133D, and the second cover plate body 51 is spot welded with the shell body 1 to complete the preliminary connection of the second cover plate module 5 and the shell body 1.

[0133] By arranging the second cover plate module 5 hot melt connected with the insulation film on the second surface, the second surface is protected, so that whether the first surface is arranged with the fixed end plate 4 or not, the shell-entering unit with at least five-surface protection for the pole group can be formed, thereby avoiding damage to the pole group when entering the shell.

[0134] The second cover plate module 5 is a cover plate assembly of a traditional blade battery, which can be a traditional welding cover plate, a riveting cover plate, or a minimalist cover plate, etc. In this embodiment seven, the second cover plate module 5 is a traditional riveting cover plate.

[0135] Since the opening of the shell body 1 opposite to the first surface is closed by the first cover plate module 2, while ensuring that the tab of the pole group on one side has high welding quality, the opening of the shell body 1 opposite to the second surface is closed by the second cover plate module 5 with mature technology, thereby helping to control the manufacturing cost while improving the welding quality and convenience of the tab on one side of the pole group.

[0136] In this embodiment, the first surface is provided with a fixed end plate 4, so that the first surface of the pole group is protected by the fixed end plate 4, and the second surface of the pole group is protected by the second cover plate module 5, in cooperation with the insulating film wrapped on the side surface, thereby forming a shell-entering unit with six-sided protection, which has high protection performance for the pole group. And since the second cover plate module 5 is hot-melted on the second surface of the pole group, after the shell-entering unit enters the shell, the second cover plate module 5 can simultaneously close the opening of the shell body 1 opposite to the second surface, thereby reducing the process steps of assembly and improving the assembly efficiency.

[0137] Therefore, after the assembly steps of embodiment seven are completed, a battery structure with one first cover plate module 2, one second cover plate module 5, and one fixed end plate 4 provided on the first surface is formed, which not only has a shell-entering unit with six-sided protection and high protection performance, but also ensures that the tab of the pole group on one side has high welding quality.

[0138] Embodiment eight

[0139] For the sake of simplicity, the same or corresponding parts of embodiment eight and embodiment seven use the corresponding reference numerals of embodiment seven, and only the difference between embodiment eight and embodiment seven is described, which is that in step S12, no fixed end plate 4 is provided on the first surface.

[0140] Therefore, after the assembly steps of embodiment eight are completed, a battery structure with one first cover plate module 2 and one second cover plate module 5 is formed, but no fixed end plate 4 is provided. At this time, the second cover plate module 5 on the second surface and the insulating film form a shell-entering unit with five-sided protection, which has lower protection performance than embodiment seven, but reduces the number of parts, reduces the cost, reduces the assembly process, and improves the assembly efficiency.

[0141] Optionally, the application also provides a battery, 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 conductive efficiency, and the power supply capacity and product quality are improved.

[0142] Obviously, the above-mentioned embodiments of the application are only examples for clearly illustrating the application, and are not intended to limit the implementation modes of the application. Various obvious changes, re-adjustments and substitutions can be made by those skilled in the art without departing from the protection scope of the application. All the implementation modes are not required or possible to be enumerated here. Any modification, equivalent substitution and improvement within the spirit and principle of the application shall be included in the protection scope of the claims of the application.

Claims

1. A method of assembling a battery, characterized by, The battery assembled by the battery assembling method comprises a pole group with two side tab ears, a shell body, a first cover plate module and a closing module; The battery assembling method comprises the following steps: S1, taking the pole group as the core, preparing a shell entering unit, the shell body is a double-side open structure with a cavity, the shell entering unit is loaded into the cavity of the shell body, and any side opening of the shell body is closed; S2, the first cover plate module is arranged at the opening of the shell body which is not closed, the first cover plate module comprises a first cover plate body, a first pole column and a connecting sheet, the first cover plate body is provided with a connecting window which is communicated with the cavity of the shell body, one end of the connecting sheet is fixed on the first cover plate body by the first pole column, the other end of the connecting sheet extends to below the connecting window, the tab ear opposite to the first cover plate body is bent, and the tab ear is overlapped on the surface of the connecting sheet which faces the connecting window; S3, the structure closing the two side openings of the shell body is finally welded with the shell body; S4, the tab ear exposed below the connecting window is welded with the connecting sheet; S5, the closing module comprises a closing plate and an insulating plate, the insulating plate is arranged on the side of the closing plate which faces the tab ear, the closing plate is arranged at the connecting window of the first cover plate body, and the closing plate is welded with the first cover plate body; In step S1, the following steps are further included: S11, the pole group comprises a first surface and a second surface provided with the tab ear, and a plurality of side surfaces perpendicular to the first surface and the second surface, and the insulating film is wrapped on the plurality of side surfaces of the pole group; S12, the battery further comprises at least one fixed end plate, the fixed end plate is provided with a avoiding through slot for the tab ear to pass through, and at most one fixed end plate is arranged on the first surface and is hot-melted with the insulating film; S13, the battery further comprises at most one second cover plate module, at most one fixed end plate, at most one second cover plate module or at most one first cover plate module is arranged on the second surface and is hot-melted with the insulating film, so as to form the shell entering unit, and the first cover plate module or the second cover plate module is preliminarily welded with the shell body, so as to close the opening of the shell body opposite to the second surface; In step S13, when the first cover plate module is arranged on the second surface and is hot-melted with the insulating film, step S13 further comprises the following steps: S131C, the first cover plate module further comprises a first insulating piece, the first insulating piece is provided with a through structure which is communicated with the connecting window, the first insulating piece is arranged on the side of the first cover plate body which faces the pole group, the first cover plate body is arranged on the second surface, the tab ear of the second surface is bent, the tab ear is overlapped on the surface of the connecting sheet which faces the through structure, and the first insulating piece is hot-melted with the insulating film, so as to form the shell entering unit; S132C, the shell unit is installed in the cavity of the shell body, and the first cover plate body closes the opening of the shell body opposite to the second surface; S133C, the first cover plate body is spot welded with the shell body, and the preliminary connection of the first cover plate module and the shell body is completed; In step S12, the first surface is not provided with the fixed end plate, and a battery structure with two first cover plate modules and without the fixed end plate is formed. At this time, the first cover plate module of the second surface and the insulation film form the shell unit with five protections; In step S13, when the second cover plate module is provided on the second surface and the insulation film, step S13 further includes the following steps: S131D, the second cover plate module includes a second cover plate body, a second insulation piece and a second pole column. The second insulation piece is arranged on the side of the second cover plate body facing the pole group. One end of the second pole column is fixedly connected to the second cover plate body. The other end of the second pole column penetrates the second insulation piece. The second cover plate body is arranged at the second surface. The tab of the second surface is bent. The tab is connected to the end of the second pole column penetrating the second insulation piece. The second insulation piece is thermally fused with the insulation film to form the shell unit. S132D, the shell unit is installed in the cavity of the shell body, and the second cover plate body closes the opening of the shell body opposite to the second surface; S133D, and the second cover plate body is spot welded with the shell body, and the preliminary connection of the second cover plate module and the shell body is completed; In step S12, the first surface is not provided with the fixed end plate, and a battery structure with one first cover plate module and one second cover plate module and without the fixed end plate is formed. At this time, the second cover plate module of the second surface and the insulation film form the shell unit with five protections; In step S5, the following steps are further included: S51, the side of the first cover plate body away from the pole group is provided with a mounting boss. The mounting boss is provided with a mounting through hole in communication with the connecting window and arranged in a stepped distribution. A limiting step is formed between the mounting through hole and the connecting window. The closure plate includes a closure part and a plug-in part. The insulation plate is arranged on the side of the plug-in part away from the closure part. The plug-in part of the closure plate is inserted into the connecting window. The closure part of the closure plate is inserted into the mounting through hole, and the closure part abuts against the limiting step; S52, the closure part is welded with the first cover plate body. The width dimension of the limiting step and the closure part overlapping in the first direction is W. When the closure part and the first cover plate body are butt welding, the width dimension W satisfies 0.5mm≤W≤20mm; When the closure part and the first cover plate body are penetration welding, the width dimension W satisfies 1mm≤W≤20mm.

2. The battery assembling method according to claim 1, wherein In step S13, when the fixed end plate is arranged to be thermally fused with the second surface and the insulation film, and the first cover plate module is arranged to close the opening opposite to the second surface of the shell body, step S13 comprises the following steps: S131A, arranging the fixed end plate to be thermally fused with the second surface and the insulation film, and passing the tab on the second surface through the avoiding through slot of the fixed end plate to form the shell-in unit; S132A, loading the shell-in unit into the cavity of the shell body; S133A, arranging the first cover plate body provided with the connecting window on the opening side opposite to the second surface, and bending the tab of the second surface passing through the avoiding through slot to make the tab lap on the surface of the connecting sheet facing the connecting window; S134A, spot welding the first cover plate body and the shell body to complete the preliminary connection of the first cover plate module and the shell body.

3. The battery assembly method of claim 1, wherein, In step S13, when the fixed end plate is arranged to be thermally fused with the second surface and the insulation film, and the second cover plate module is arranged to close the opening opposite to the second surface of the shell body, step S13 comprises the following steps: S131B, arranging the fixed end plate to be thermally fused with the second surface and the insulation film, and passing the tab on the second surface through the avoiding through slot of the fixed end plate to form the shell-in unit; S132B, loading the shell-in unit into the cavity of the shell body; S133B, the second cover plate module comprises a second cover plate body and a second pole, the second pole is fixedly connected to the second cover plate body, arranging the second cover plate body connected with the second pole on the opening side opposite to the second surface, and bending the tab of the second surface passing through the avoiding through slot to make the tab of the second surface connected to the side of the second pole facing the pole group; S134B, spot welding the second cover plate body and the shell body to complete the preliminary connection of the second cover plate module and the shell body.

4. The battery assembly method of claim 1, wherein, In step S11, further comprising the following steps: S111, the battery further comprises at least one protective side plate, and the at least one protective side plate is arranged to be thermally fused at the set position of the insulation film in advance; S112, wrapping the insulation film on the plurality of side surfaces of the pole group, and making the at least one protective side plate cover one of the side surfaces of the pole group.

5. A battery characterized by The battery is assembled by the battery assembling method in any one of claims 1-4. The battery is assembled by the battery assembling method in any one of claims 1-4.

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