Battery assembly method and battery

Abstract

The invention belongs to the technical field of batteries, and discloses a battery assembly method and a battery. In the battery assembly method, a first wall surface and a second wall surface which form a shell body are of an integrated structure, and a connecting window for realizing tab welding operation is formed in the first wall surface; on one hand, after the tab opposite to the first wall surface is welded, the first wall surface side can close the shell body without welding operation, so that 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, and the welding efficiency is improved. On the other hand, the first wall surface and the first connecting sheet are fixed together through the first pole, and the first wall surface and the second wall surface are of an integrated structure, so that when the tab and the first connecting sheet are welded through the connecting window, the tab and the first connecting sheet are in a relatively stable state; and the difficulty of the welding operation of the tab and the first connecting sheet 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 blade battery is constructed with the electrode group with pole ears on both sides as the core component. The traditional blade battery assembly process usually first installs the pole group into the battery casing, then bends the pole ears on both sides of the pole group several times to form an approximate S shape, and then installs the cover plate assembly connected with the pole column into the two sides of the battery casing respectively, and welds the pole ears and the pole column. After the welding of the pole ears and the pole column is completed, the battery casing is welded to the bare aluminum plates in the cover plate assemblies on both sides, and the battery casing is sealed to complete the assembly of the blade battery.

[0003] However, for blade batteries assembled using this method, on the one hand, it is necessary to complete the welding of the pole ears and the poles first, resulting in that when welding the bare aluminum plate and the battery casing, adverse factors such as vibration and high temperature during the welding process will affect the already welded pole ears and poles, resulting in reduced welding quality between the poles and the poles, affecting the conductive efficiency. On the other hand, when welding the pole ears and the poles, in order to ensure the welding quality of the two, it is necessary to ensure the relative stability between the pole ears and the poles. However, since the welding of the cover assembly and the battery casing is located after the welding of the poles and the pole ears, the cover assembly and the battery casing are in a relatively free state, resulting in greater difficulty in the operation when welding the pole ears and the poles. 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 and high welding quality.

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

[0006] In one aspect, a battery assembly method is provided, wherein the battery assembled by the battery assembly method comprises an outer shell module, an entry unit and a closed module;

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

[0008] S1. The shell module comprises a shell body, a first pole and a first 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 first connecting piece is fixed to the first wall surface by the first pole, and the other end of the first connecting piece extends to the bottom of the connecting window. The shell entry unit comprises a pole group with pole ears on both sides. The shell entry unit is installed into the cavity of the shell body, and the pole ear opposite to the first wall surface is bent so that the pole ear overlaps the surface of the first connecting piece facing the connecting window, and the opening of the shell body is closed.

[0009] S2, completing final welding of the structure for sealing the opening of the outer shell body and the outer shell body;

[0010] S3, welding the tab toward the bottom of the connection window;

[0011] S4. Arrange the closing module at the connection window and close the connection window.

[0012] Optionally, in step S1, the following steps are also included:

[0013] S11, the electrode group includes a first surface and a second surface provided with the electrode ear, and a plurality of side surfaces perpendicular to the first surface and the second surface, the first surface is arranged opposite to the first wall surface, and an insulating film is coated on the plurality of side surfaces of the electrode group;

[0014] S12, the battery further comprises at least one fixed end plate, the fixed end plate is provided with an avoidance groove for the tab to pass through, and at most one fixed end plate is arranged on the first surface and is thermally melted with the insulating film;

[0015] S13. The battery also includes at most one first cover plate module or at most one second cover plate module. At most one fixed end plate, or at most one first cover plate module, or at most one second cover plate module is arranged on the second surface and hot-melted with the insulating film to form the shell unit. The first cover plate module or the second cover plate module is preliminarily welded to the outer shell body to close the opening of the outer shell body.

[0016] Optionally, in step S13, when the fixed end plate is provided on the second surface and is thermally melted with the insulating film, and the first cover plate module is used to seal the opening of the housing body, step S13 includes the following steps:

[0017] S131A, placing the fixed end plate on the second surface and hot-melting the insulating film, and allowing the pole lug on the second surface to pass through the avoidance groove of the fixed end plate to form the shell-entry unit;

[0018] S132A, inserting the shell entry unit into the cavity of the shell body;

[0019] S133A, the first cover plate module comprises a first cover plate body, a second pole and a second connecting piece, the first cover plate body is provided with the connecting window communicating with the cavity of the shell body, one end of the second connecting piece is fixed to the first cover plate body by the second pole, and the other end of the second connecting piece extends to below the connecting window, the first cover plate module is arranged on a side of the fixed end plate away from the pole group, and the pole ear passing through the avoidance groove on the second surface is bent so that the pole ear overlaps the surface of the second connecting piece facing the connecting window;

[0020] S134A, spot-welding the first cover plate body and the outer shell body to complete the preliminary connection between the first cover plate module and the outer shell body.

[0021] Optionally, in step S13, when the fixed end plate is provided on the second surface and is thermally melted with the insulating film, and the opening of the housing body is sealed by the second cover plate module, step S13 includes the following steps:

[0022] S131B, placing the fixed end plate on the second surface and hot-melting the insulating film, and allowing the pole lug on the second surface to pass through the avoidance groove of the fixed end plate to form the shell-entry unit;

[0023] S132B, inserting the shell entry unit into the cavity of the shell body;

[0024] S133B, the second cover plate module comprises a second cover plate body and a third pole, the third pole is fixedly connected to the second cover plate body, the second cover plate module is arranged on a side of the fixed end plate away from the pole group, and the pole ear passing through the avoidance groove on the second surface is bent so that the pole ear is connected to a side of the third pole facing the pole group;

[0025] S134B, spot-welding the second cover plate body and the outer shell body to complete the preliminary connection between the second cover plate module and the outer shell body.

[0026] Optionally, in step S13, when the first cover plate module is provided on the second surface and is thermally melted with the insulating film, step S13 further includes the following steps:

[0027] S131C, the first cover plate module also includes a first cover plate body, a second pole, a second connecting piece and a first insulating member, the first cover plate body is provided with the connecting window connected to the shell body cavity, the first insulating member is arranged on the side of the first cover plate body facing the pole group, and is provided with a through structure connected to the connecting window, one end of the second connecting piece is fixed to the first cover plate body by the second pole, and the other end of the second connecting piece extends to the bottom of the connecting window, the first cover plate body is arranged on the second surface, and the pole ear of the second surface is bent so that the pole ear overlaps the surface of the second connecting piece facing the through structure, and the first insulating member and the insulating film are hot-melted to form the shell unit;

[0028] S132C, inserting the shell entry unit into the cavity of the outer shell body, and the first cover plate body closing the opening of the outer shell body;

[0029] S133C, spot-weld the first cover plate body and the outer shell body to complete the preliminary connection between the first cover plate module and the outer shell body.

[0030] Optionally, in step S13, when the second cover plate module is provided on the second surface and is thermally melted with the insulating film, step S13 further includes the following steps:

[0031] S131D, the second cover plate module comprises a second cover plate body, a second insulating member and a third pole, the second insulating member is arranged on the side of the second cover plate body facing the pole group, one end of the third pole is fixedly connected to the second cover plate body, the other end of the third pole passes through the second insulating member, the second cover plate body is arranged at the second surface, and the pole ear on the second surface is bent so that the pole ear is connected to one end of the third pole passing through the second insulating member, and the second insulating member and the insulating film are hot-melted to form the shell unit;

[0032] S132D, inserting the shell entry unit into the cavity of the outer shell body, and the second cover plate body closing the opening of the outer shell body;

[0033] S133D, spot welding the second cover plate body and the outer shell body to complete the preliminary connection between the second cover plate module and the outer shell body.

[0034] Optionally, in step S11, the following steps are also included:

[0035] S111, the battery further includes at least one protective side plate, and at least one protective side plate is pre-heat-fused to a set position of the insulating film;

[0036] S112, covering the plurality of side surfaces of the electrode group with the insulating film, and making at least one of the protective side plates cover one of the side surfaces of the electrode group.

[0037] Optionally, the closed module includes a closed plate and an insulating plate, and in step S4, the following steps are further included:

[0038] S41, the first cover body, and / or, 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 distributed in a stepped manner is opened on the mounting boss, and a limiting step is formed between the mounting through hole and the connection window, the closing plate includes 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;

[0039] S42. The closing portion is welded to the first cover plate body and / or the first wall surface, and 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 cover plate body and / or the first wall surface are butt welded, the width dimension W satisfies 0.5mm≤W≤20mm.

[0040] Optionally, when the closing portion and the first cover plate body, and / or the first wall surface are penetration welded, a width dimension W satisfies 1mm≤W≤20mm.

[0041] On the other hand, a battery is also provided, wherein the battery is assembled using any of the battery assembly methods described above.

[0042] Beneficial effects of the present invention:

[0043] The present invention provides a battery assembly method. In the battery assembly method, since the first wall and the second wall constituting the outer shell body are an integrated structure, and a connection window for realizing the welding operation of the pole ear is provided on the first wall, on the one hand, after the welding process of the pole ear opposite to the first wall is completed, the first wall side does not need to be welded to achieve the closure of the outer shell body, thereby avoiding the pole 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 outer shell body is closed after the welding operation is completed, thereby improving the welding quality. On the other hand, since the first wall and the first connecting piece are fixed together by the first pole, and the first wall and the second wall are an integrated structure, when the welding operation of the pole ear and the first connecting piece is performed through the connection window, the pole ear and the first connecting piece are in a relatively stable state, thereby reducing the difficulty of the welding operation of the pole ear and the first connecting piece.

[0044] 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

[0045] Figure 1 is a flow chart of the steps of the battery assembly method provided by the present invention;

[0046] Figure 2 It is a structural cross-sectional view of the first wall surface of the housing module of the battery provided by the present invention;

[0047] Figure 3 It is a structural cross-sectional view of the first cover plate body of the first cover plate module in the battery provided by the present invention;

[0048] Figure 4 It is a partial structural schematic diagram of a battery provided by the present invention in which a first cover plate body is provided with a mounting boss;

[0049] Figure 5 It is a structural schematic diagram of a first insulating member in a first cover plate module provided by the present invention;

[0050] Figure 6 This is a structural breakdown diagram of a closed module in a battery provided by the present invention;

[0051] Figure 7 It is a structural schematic diagram of a fixed end plate in a battery provided by the present invention;

[0052] Figure 8 is an assembly diagram of the second cover plate module in the battery provided by the present invention;

[0053] Fig. 9 It is a schematic structural diagram of the outer shell body in the battery provided by the present invention.

[0054] In the figure:

[0055] 100, connection window; 200, mounting boss; 300, mounting through hole; 400, limiting step;

[0056] 1. Shell module; 11. Shell body; 111. First wall surface; 112. Second wall surface; 12. First pole; 13. First connecting piece;

[0057] 2. First cover plate module; 21. First cover plate body; 22. Second pole; 23. Second connecting piece; 24. First insulating member; 241. Penetrating structure;

[0058] 3. Closed module; 31. Closed plate; 311. Closed portion; 312. Connecting portion; 32. Insulating plate;

[0059] 4. Fixed end plate; 41. Avoidance slot;

[0060] 5. Second cover plate module; 51. Second cover plate body; 52. Third pole; 53. Second insulating member. DETAILED DESCRIPTION

[0061] 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.

[0062] 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.

[0063] 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.

[0064] 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.

[0065] Embodiment 1

[0066] like Figures 1 to 9 As shown, the battery assembly method includes the following steps:

[0067] S1. The shell module 1 includes a shell body 11, a first pole 12 and a first connecting piece 13. The shell 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 100 communicating with the cavity is provided on the first wall 111. One end of the first connecting piece 13 is fixed to the first wall 111 by the first pole 12, and the other end of the first connecting piece 13 extends to the bottom of the connecting window 100. The shell entry unit includes a pole group with pole ears on both sides. The shell entry unit is installed in the cavity of the shell body 11, and the pole ear opposite to the first wall 111 is bent so that the pole ear overlaps the surface of the first connecting piece 13 facing the connecting window 100, and the opening of the shell body 11 is closed;

[0068] S2, completing the final welding of the structure closing the open end of the shell body 11 and the shell body 11;

[0069] S3, welding the electrode ear facing the connection window 100;

[0070] S4, placing the closing module 3 at the connection window 100 and closing the connection window 100.

[0071] In the battery assembly method, since the first wall 111 and the second wall 112 constituting the shell body 11 are an integrated structure, and a connection window 100 for realizing the electrode ear welding operation is provided on the first wall 111, on the one hand, after the electrode ear opposite to the first wall 111 completes the welding process, the first wall 111 side does not need to be welded to close the shell body 11, thereby avoiding the electrode ear 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. On the other hand, since the first wall 111 and the first connecting piece 13 are fixed together by the first pole 12, and the first wall 111 and the second wall 112 are an integrated structure, when the electrode ear and the first connecting piece 13 are welded through the connection window 100, the electrode ear and the first connecting piece 13 are in a relatively stable state, thereby reducing the difficulty of welding the electrode ear and the first connecting piece 13.

[0072] Alternatively, if Figure 2 , Figure 3 , Figure 7 As shown, in step S1, the following steps are also included:

[0073] S11, the electrode group includes a first surface and a second surface with electrode ears, and a plurality of side surfaces perpendicular to the first surface and the second surface, the first surface is arranged opposite to the first wall surface 111, and an insulating film is coated on the plurality of side surfaces of the electrode group;

[0074] S12, the battery further comprises at least one fixed end plate 4, the fixed end plate 4 is provided with an avoidance groove 41 for the tab to pass through, and at most one fixed end plate 4 is arranged on the first surface and is thermally melted with the insulating film;

[0075] S13. The battery also includes at most one first cover plate module 2 or at most one second cover plate module 5. At most one fixed end plate 4, or at most one first cover plate module 2, or at most one second cover plate module 5 is arranged on the second surface and hot-melted with the insulating film to form a shell unit. The first cover plate module 2 or the second cover plate module 5 is preliminarily welded to the outer shell body 11 to close the opening of the outer shell body 11.

[0076] By coating multiple sides of the pole group with an insulating film, the pole group is protected on four sides. Secondly, by arranging at most one fixed end plate 4 hot-melt-connected with the insulating film on the first surface, and arranging 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 hot-melt-connected with the insulating film on the second surface, a layer of protection is added on the first surface and / or the second surface, which cooperates with the insulating film coated on the side of the pole group to form a shell entry unit with at least five-sided protection, thereby ensuring the protection of the pole group when entering the shell, avoiding damage to the pole group when entering the shell, and ensuring product quality.

[0077] In step S13 of the first embodiment, when the fixed end plate 4 is provided on the second surface and connected to the insulating film by heat melting, and the opening of the closed housing body 11 opposite to the second surface is the first cover plate module 2, step S13 includes the following steps:

[0078] S131A, placing the fixed end plate 4 on the second surface and hot-melting the insulating film, and passing the pole lugs on the second surface through the avoidance slots 41 of the fixed end plate 4 to form a shell-entry unit;

[0079] S132A, inserting the shell unit into the cavity of the shell body 11;

[0080] S133A, the first cover plate module 2 includes a first cover plate body 21, a second pole 22 and a second connecting piece 23, the first cover plate body 21 is provided with a connecting window 100 communicating with the cavity of the shell body 11, one end of the second connecting piece 23 is fixed to the first cover plate body 21 by the second pole 22, and the other end of the second connecting piece 23 extends to below the connecting window 100, the first cover plate module 2 is arranged on the side of the fixed end plate 4 away from the pole group, and the pole ear passing through the avoidance groove 41 on the second surface is bent so that the pole ear overlaps the surface of the second connecting piece 23 facing the connecting window 100;

[0081] S134A, spot-weld the first cover plate body 21 and the outer shell body 11 to complete the preliminary connection between the first cover plate module 2 and the outer shell body 11.

[0082] By providing a fixed end plate 4 hot-melt-connected to the insulating film on the second surface, the second surface is protected, so that no matter whether the fixed end plate 4 is provided on the first surface, a shell entry unit with at least five-sided protection for the pole group can be formed, thereby avoiding damage to the pole group when entering the shell.

[0083] In this embodiment, a fixed end plate 4 is also provided on the first surface, so that the first surface and the second surface of the pole group are both provided with a fixed end plate 4 connected to the insulating film by hot melt, thereby forming a shell unit with six-sided protection, which has high protection performance for the pole group. In addition, the first cover plate module 2 is used to close the opening of the shell body 11 relative to the second surface, so that when assembling, the welding process of closing the opening of the shell body 11 is located before the welding process of the pole ear and the second connecting piece 23 on the second surface, thereby avoiding the influence of adverse factors such as vibration and high temperature during the welding process on the second surface of the second surface when the shell body 11 is closed. The welding quality between the pole ear and the second connecting piece 23 on the second surface is improved. On the other hand, since the first cover plate module 2 and the shell body 11 are in a fixed state, the difficulty of welding the pole ear and the second connecting piece 23 on the second surface is reduced.

[0084] Therefore, after the assembly steps of Example 1 are completed, a battery structure is formed, which includes a shell module 1 with a connection window 100 on the first wall 111, a first cover module 2 with a connection window 100 on the first cover body 21, and two fixed end plates 4. It not only has a six-sided protected shell unit with high protection, but also ensures that the pole ears on both sides have high welding quality.

[0085] Optionally, in step S11, the following steps are also included:

[0086] S111, the battery further includes at least one protective side plate, and the at least one protective side plate is pre-heat-fused to a set position of the insulating film;

[0087] S112, wrapping the insulating film on multiple side surfaces of the electrode group, and making at least one protective side plate cover one side surface of the electrode group.

[0088] The side plates are protected from scratches when entering the shell.

[0089] Alternatively, if Figure 2 , Figure 3 , Figure 6 As shown, the closed module 3 includes a closed plate 31 and an insulating plate 32. In step S4, the following steps are also included:

[0090] S41, the first cover body 21, and / or, a mounting boss 200 is provided on a side of the first wall 111 away from the pole group, a mounting through hole 300 communicating with the connection window 100 and distributed in a stepped manner is opened on the mounting boss 200, and a limiting step 400 is formed between the mounting through hole 300 and the connection window 100, the closing plate 31 includes a closing portion 311 and a plug-in portion 312, the insulating plate 32 is provided on a 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 100, the closing portion 311 of the closing plate 31 is inserted into the mounting through hole 300, and the closing portion 311 is abutted against the limiting step 400;

[0091] S42. Weld the closing portion 311 to the first cover plate body 21 and / or the first wall surface 111. The overlapping width dimension of the limiting step 400 and the closing portion 311 along the first direction is W. When the closing portion 311 and the first cover plate body 21 and / or the first wall surface 111 are butt welded, the width dimension W satisfies 0.5mm≤W≤20mm.

[0092] By limiting the width dimension W when the butt welding is adopted to satisfy 0.5mm≤W≤20mm, on the one hand, it is avoided that the overlapping width is too small, which leads to the occurrence of undesirable phenomena such as broken welding and explosion points during the butt welding, and on the other hand, it is avoided that the overlapping width dimension is too large, which leads to an increase in the structural dimensions and additional costs. In this embodiment, the first cover plate body 21 and the first wall surface 111 are both provided with mounting bosses 200.

[0093] Alternatively, if Figure 2 , Figure 3 As shown, when the closing portion 311 and the first cover plate body 21 and / or the first wall surface 111 are through-welded, the width dimension W satisfies 1 mm ≤ W ≤ 20 mm.

[0094] By limiting the width dimension W when penetration welding is adopted to satisfy 1mm≤W≤20mm, on the one hand, it is avoided that the overlapping width is too small, resulting in insufficient strength between the first cover plate body 21 and / or the first wall surface 111 and the closing plate 31 after penetration 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 structural outer dimensions and additional costs. In this embodiment, the first cover plate body 21 and the first wall surface 111 are both provided with mounting bosses 200.

[0095] Embodiment 2

[0096] For the sake of simplicity, the components of Embodiment 2 that are identical or corresponding to those of Embodiment 1 are marked with the same reference numerals as those of Embodiment 1, and only the differences between Embodiment 2 and Embodiment 1 are described, which is that in step S12, no fixed end plate 4 is provided on the first surface.

[0097] Therefore, after the assembly steps of Example 2 are completed, a battery structure is formed, which includes a shell module 1 with a connection window 100 on the first wall 111, a first cover module 2 with a connection window 100 on the first cover body 21, and a fixed end plate 4 arranged on the second surface. At this time, the fixed end plate 4 on the second surface and the insulating film form a shell unit with five-sided protection. Compared with Example 1, the protection performance is reduced, but the number of parts is reduced, the cost is reduced, the assembly process is shortened, and the assembly efficiency is improved.

[0098] Embodiment 3

[0099] For the sake of simplicity, the components of Embodiment 3 that are identical or corresponding to those of Embodiment 1 are marked with the same reference numerals as those of Embodiment 1, and only the differences between Embodiment 3 and Embodiment 1 are described, which is that step S13 in Embodiment 3 is different from step S13 in Embodiment 1.

[0100] In step S13 of the third embodiment, when the fixed end plate 4 is provided on the second surface and connected to the insulating film by heat melting, and the opening of the closed shell body 11 is the second cover plate module 5, step S13 includes the following steps:

[0101] S131B, placing the fixed end plate 4 on the second surface and hot-melting the insulating film, and allowing the pole lugs on the second surface to pass through the avoidance slots 41 of the fixed end plate 4 to form a shell-entry unit;

[0102] S132B, inserting the shell unit into the cavity of the shell body 11;

[0103] S133B, the second cover plate module 5 includes a second cover plate body 51 and a third pole 52, the third pole 52 is fixedly connected to the second cover plate body 51, the second cover plate module 5 is arranged on the side of the fixed end plate 4 away from the pole group, and the pole ear passing through the avoidance groove 41 on the second surface is bent so that the pole ear is connected to the side of the third pole 52 facing the pole group;

[0104] S134B, spot-weld the second cover plate body 51 and the outer shell body 11 to complete the preliminary connection between the second cover plate module 5 and the outer shell body 11.

[0105] The second cover plate module 5 is a cover plate assembly of a conventional blade battery, and its type may be a conventional welded cover plate, a riveted cover plate, or a minimalist cover plate, etc. In the third embodiment, the second cover plate module 5 is a conventional riveted cover plate.

[0106] In this embodiment, a fixed end plate 4 is also provided on the first surface, so that the first surface and the second surface of the pole group are both provided with a fixed end plate 4 connected to the insulating film by heat melting, thereby forming a shell unit with six-sided protection, which has a high protection performance for the pole group. In addition, since the pole ear on the other side of the pole group is fixed on the first wall 111, the welding quality is improved. Therefore, while ensuring that the pole ear on one side of the pole group has a high welding quality, the opening of the shell body 11 is closed by using a second cover plate module 5 with a mature process, which helps to control the manufacturing cost while improving the welding quality and welding convenience of the pole ear on one side.

[0107] Therefore, after the assembly steps of Example 3 are completed, a battery structure is formed, which includes a shell module 1 with a connection window 100 opened on the first wall 111, a second cover module 5 for closing the opening, and two fixed end plates 4. The battery structure not only has a six-sided protected shell unit with high protection, but also ensures that the pole ear on one side of the pole group has a high welding quality.

[0108] Embodiment 4

[0109] For the sake of simplicity, the components of the fourth embodiment that are identical or corresponding to those of the third embodiment are marked with the same reference numerals as those of the third embodiment, and only the differences between the fourth embodiment and the third embodiment are described, which is that in step S12, no fixed end plate 4 is provided on the first surface.

[0110] Therefore, after the assembly steps of the fourth embodiment are completed, a battery structure is formed, which includes a shell module 1 with a connection window 100 opened on the first wall 111, a second cover module 5 for closing the opening, and a fixed end plate 4 arranged on the second surface. At this time, the fixed end plate 4 on the second surface and the insulating film form a shell unit with five-sided protection. Compared with the third embodiment, the protection performance is reduced, but the number of parts is reduced, the cost is reduced, the assembly process is shortened, and the assembly efficiency is improved.

[0111] Embodiment 5

[0112] For the sake of simplicity, the components of Example 5 that are the same as or corresponding to those of Example 1 are marked with the same reference numerals as those of Example 1, and only the differences between Example 5 and Example 1 are described, which is that step S13 in Example 1 is different from step S13 in Example 3.

[0113] In step S13 of the fifth embodiment, when the first cover plate module 2 is provided on the second surface and connected to the insulating film by heat melting, step S13 includes the following steps:

[0114] S131C, the first cover plate module 2 also includes a first cover plate body 21, a second pole 22, a second connecting piece 23 and a first insulating member 24, the first cover plate body 21 is provided with a connecting window 100 communicating with the cavity of the shell body 11, the first insulating member 24 is arranged on the side of the first cover plate body 21 facing the pole group, and is provided with a through structure 241 communicating with the connecting window 100, one end of the second connecting piece 23 is fixed to the first cover plate body 21 by the second pole 22, and the other end of the second connecting piece 23 extends to the bottom of the connecting window 100, the first cover plate body 21 is arranged on the second surface, and the pole ear of the second surface is bent so that the pole ear overlaps on the surface of the second connecting piece 23 facing the through structure 241, and the first insulating member 24 is hot-melted with the insulating film to form a shell unit;

[0115] S132C, inserting the shell unit into the cavity of the outer shell body 11, and closing the opening of the outer shell body 11 with the first cover plate body 21;

[0116] S133C, spot-weld the first cover plate body 21 and the outer shell body 11 to complete the preliminary connection between the first cover plate module 2 and the outer shell body 11.

[0117] By providing a first cover plate module 2 which is hot-melt connected to the insulating film on the second surface, the second surface is protected, so that no matter whether a fixed end plate 4 is provided on the first surface, a shell entry unit with at least five-sided protection for the pole group can be formed, thereby avoiding damage to the pole group when entering the shell.

[0118] In this embodiment, a fixed end plate 4 is provided on the first surface, 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 coated on the side is cooperated to form a shell unit with six-sided protection, which has high protection performance for the pole group. In addition, the first cover plate module 2 is used to close the opening of the shell body 11, so that the pole ear on the second surface and the second connecting piece 23 are also located after the welding process of the first cover plate body 21 and the shell body 11 during welding, that is, when the shell body 11 is sealed, the vibration, high temperature and other adverse factors during the welding process affect the pole ear and the second connecting piece 23 on the second surface that have been welded, which improves the welding quality between the second connecting piece 23 and the pole ear on the second surface. Since the first cover plate module 2 and the shell body 11 are in a fixed state, the difficulty of welding the pole ear on the second surface and the second connecting piece 23 is reduced.

[0119] Therefore, after the assembly steps of Example 5 are completed, a battery structure is formed, which includes a shell module 1 with a connection window 100 on the first wall 111, a first cover module 2 with a connection window 100 on the first cover body 21, and a fixed end plate 4 arranged on the first surface. It not only has a six-sided protected shell unit with high protection, but also ensures that the pole ears on both sides have high welding quality.

[0120] Embodiment 6

[0121] For the sake of simplicity, the parts of Example 6 that are the same as or corresponding to those of Example 5 are marked with the same reference numerals as those of Example 5, and only the differences between Example 6 and Example 5 are described. The difference is that in step S12, no fixed end plate 4 is provided on the first surface.

[0122] Therefore, after the assembly steps of Example 6 are completed, a battery structure is formed, which has an outer shell module 1 with a connection window 100 on the first wall 111 and a first cover module 2 with a connection window 100 on the first cover body 21, but no fixed end plate 4 is provided. At this time, the first cover module 2 on the second surface and the insulating film form a shell unit with five-sided protection. Compared with Example 5, the protection performance is reduced, but the number of parts is reduced, the cost is reduced, the assembly process is shortened, and the assembly efficiency is improved.

[0123] Embodiment 7

[0124] For the sake of simplicity, the components of Embodiment 7 that are the same as or corresponding to those of Embodiment 1 are marked with the same reference numerals as those of Embodiment 1, and only the differences between Embodiment 7 and Embodiment 1 are described, which is that step S13 in Embodiment 7 is different from step S13 in Embodiment 1.

[0125] In step S13 of the seventh embodiment, when the second cover plate module 5 is provided on the second surface and connected to the insulating film by heat melting, step S13 includes the following steps:

[0126] S131D, the second cover plate module 5 includes a second cover plate body 51, a second insulating member 53 and a third pole 52, the second insulating member 53 is arranged on the side of the second cover plate body 51 facing the pole group, one end of the third pole 52 is fixedly connected to the second cover plate body 51, and the other end of the third pole 52 passes through the second insulating member 53, the second cover plate body 51 is arranged at the second surface, and the pole ear on the second surface is bent so that the pole ear is connected to one end of the third pole 52 passing through the second insulating member 53, and the second insulating member 53 is hot-melted with the insulating film to form a shell unit;

[0127] S132D, inserting the shell unit into the cavity of the outer shell body 11, and closing the opening of the outer shell body 11 with the second cover plate body 51;

[0128] S133D, spot-weld the second cover plate body 51 and the outer shell body 11 to complete the preliminary connection between the second cover plate module 5 and the outer shell body 11.

[0129] By providing a second cover plate module 5 hot-melt-connected to the insulating film on the second surface, the second surface is protected, so that no matter whether a fixed end plate 4 is provided on the first surface, a shell entry unit with at least five-sided protection for the pole group can be formed, thereby avoiding damage to the pole group when entering the shell.

[0130] The second cover plate module 5 is a cover plate assembly of a conventional blade battery, and its type can be a conventional welded cover plate, a riveted cover plate, or a minimalist cover plate, etc. In the seventh embodiment, the second cover plate module 5 is a conventional riveted cover plate.

[0131] Since the electrode ear on the other side of the electrode group is fixed on the first wall 111, the welding quality is improved. Therefore, while ensuring that the electrode ear on one side of the electrode group has a higher welding quality, the opening of the shell body 11 is closed by using a second cover plate module 5 with a mature process, which helps to control the manufacturing cost while improving the welding quality and welding convenience of the electrode ear on one side.

[0132] In this embodiment, a fixed end plate 4 is provided on the first surface, 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, which cooperates with the insulating film coated on the side, thereby forming a shell unit with six-sided protection, which has a high protection performance for the pole group. And because the second cover plate module 5 is hot-melted on the second surface of the pole group, after the shell unit is shelled, the second cover plate module 5 can simultaneously close the opening of the shell body 11 relative to the second surface, thereby reducing the assembly process steps and improving the assembly efficiency.

[0133] Therefore, after the assembly steps of Example 7 are completed, a battery structure is formed, which has a shell module 1 with a connection window 100 opened on the first wall 111, a second cover module 5 for closing the opening, and a fixed end plate 4 arranged on the first surface. It not only has a six-sided protected shell unit with high protection, but also ensures that the pole ear on one side of the pole group has a high welding quality.

[0134] Embodiment 8

[0135] For the sake of simplicity, the parts of the eighth embodiment that are the same as or corresponding to those of the seventh embodiment are marked with the same reference numerals as those of the seventh embodiment, and only the differences between the eighth embodiment and the seventh embodiment are described. The difference is that in step S12, no fixed end plate 4 is provided on the first surface.

[0136] Therefore, after the assembly steps of Example 8 are completed, a battery structure is formed, which has an outer shell module 1 with a connection window 100 on the first wall 111 and a second cover module 5 for closing the opening, but no fixed end plate 4 is provided. At this time, the second cover module 5 on the second surface and the insulating film form a shell unit with five-sided protection. Compared with Example 7, the protection performance is reduced, but the number of parts is reduced, the cost is reduced, the assembly process is shortened, and the assembly efficiency is improved.

[0137] Optionally, the present application also provides a battery, which is assembled by the above-mentioned battery assembly method. The battery improves welding quality by applying the above-mentioned battery assembly method, thereby ensuring higher conductivity efficiency, improving power supply capacity and product quality.

[0138] 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 an outer shell module, an entry unit and a closed module; The battery assembly method comprises the following steps: S1. The shell module comprises a shell body, a first pole and a first 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 first connecting piece is fixed to the first wall surface by the first pole, and the other end of the first connecting piece extends to the bottom of the connecting window. The shell entry unit comprises a pole group with pole ears on both sides. The shell entry unit is installed into the cavity of the shell body, and the pole ear opposite to the first wall surface is bent so that the pole ear overlaps the surface of the first connecting piece facing the connecting window, and the opening of the shell body is closed. S2, completing final welding of the structure for sealing the opening of the outer shell body and the outer shell body; S3, welding the tab toward the bottom of the connection window; S4. Arrange the closing module at the connection window and close the connection window.

2. The battery assembly method according to claim 1, characterized in that: In step S1, the following steps are also included: S11, the electrode group includes a first surface and a second surface provided with the electrode ear, and a plurality of side surfaces perpendicular to the first surface and the second surface, the first surface is arranged opposite to the first wall surface, and an insulating film is coated on the plurality of side surfaces of the electrode group; S12, the battery further comprises at least one fixed end plate, the fixed end plate is provided with an avoidance groove for the tab to pass through, and at most one fixed end plate is arranged on the first surface and is thermally melted with the insulating film; S13. The battery also includes at most one first cover plate module or at most one second cover plate module. At most one fixed end plate, or at most one first cover plate module, or at most one second cover plate module is arranged on the second surface and hot-melted with the insulating film to form the shell unit. The first cover plate module or the second cover plate module is preliminarily welded to the outer shell body to close the opening of the outer shell body.

3. The battery assembly method according to claim 2, characterized in that: In step S13, when the fixed end plate is provided on the second surface and is thermally melted with the insulating film, and the first cover plate module is used to seal the opening of the housing body, step S13 includes the following steps: S131A, placing the fixed end plate on the second surface and hot-melting the insulating film, and allowing the pole lug on the second surface to pass through the avoidance groove of the fixed end plate to form the shell-entry unit; S132A, inserting the shell entry unit into the cavity of the shell body; S133A, the first cover plate module comprises a first cover plate body, a second pole and a second connecting piece, the first cover plate body is provided with the connecting window communicating with the cavity of the shell body, one end of the second connecting piece is fixed to the first cover plate body by the second pole, and the other end of the second connecting piece extends to below the connecting window, the first cover plate module is arranged on a side of the fixed end plate away from the pole group, and the pole ear passing through the avoidance groove on the second surface is bent so that the pole ear overlaps the surface of the second connecting piece facing the connecting window; S134A, spot-welding the first cover plate body and the outer shell body to complete the preliminary connection between the first cover plate module and the outer shell body.

4. The battery assembly method according to claim 2, characterized in that: In step S13, when the fixed end plate is provided on the second surface and is thermally melted with the insulating film, and the opening of the housing body is sealed by the second cover plate module, step S13 includes the following steps: S131B, placing the fixed end plate on the second surface and hot-melting the insulating film, and allowing the pole lug on the second surface to pass through the avoidance groove of the fixed end plate to form the shell-entry unit; S132B, inserting the shell entry unit into the cavity of the shell body; S133B, the second cover plate module comprises a second cover plate body and a third pole, the third pole is fixedly connected to the second cover plate body, the second cover plate module is arranged on a side of the fixed end plate away from the pole group, and the pole ear passing through the avoidance groove on the second surface is bent so that the pole ear is connected to a side of the third pole facing the pole group; S134B, spot-welding the second cover plate body and the outer shell body to complete the preliminary connection between the second cover plate module and the outer shell body.

5. The battery assembly method according to claim 2, characterized in that: In step S13, when the first cover plate module is provided on the second surface and thermally melted with the insulating film, step S13 further includes the following steps: S131C, the first cover plate module also includes a first cover plate body, a second pole, a second connecting piece and a first insulating member, the first cover plate body is provided with the connecting window connected to the shell body cavity, the first insulating member is arranged on the side of the first cover plate body facing the pole group, and is provided with a through structure connected to the connecting window, one end of the second connecting piece is fixed to the first cover plate body by the second pole, and the other end of the second connecting piece extends to the bottom of the connecting window, the first cover plate body is arranged on the second surface, and the pole ear of the second surface is bent so that the pole ear overlaps the surface of the second connecting piece facing the through structure, and the first insulating member and the insulating film are hot-melted to form the shell unit; S132C, inserting the shell entry unit into the cavity of the outer shell body, and the first cover plate body closing the opening of the outer shell body; S133C, spot-weld the first cover plate body and the outer shell body to complete the preliminary connection between the first cover plate module and the outer shell body.

6. The battery assembly method according to claim 2, characterized in that: In step S13, when the second cover plate module is provided on the second surface and is thermally melted with the insulating film, step S13 further includes the following steps: S131D, the second cover plate module comprises a second cover plate body, a second insulating member and a third pole, the second insulating member is arranged on the side of the second cover plate body facing the pole group, one end of the third pole is fixedly connected to the second cover plate body, the other end of the third pole passes through the second insulating member, the second cover plate body is arranged at the second surface, and the pole ear on the second surface is bent so that the pole ear is connected to one end of the third pole passing through the second insulating member, and the second insulating member and the insulating film are hot-melted to form the shell unit; S132D, inserting the shell entry unit into the cavity of the outer shell body, and the second cover plate body closing the opening of the outer shell body; S133D, spot welding the second cover plate body and the outer shell body to complete the preliminary connection between the second cover plate module and the outer shell body.

7. The battery assembly method according to claim 2, characterized in that: In step S11, the following steps are also included: S111, the battery further includes at least one protective side plate, and at least one protective side plate is pre-heat-fused to a set position of the insulating film; S112, covering the plurality of side surfaces of the electrode group with the insulating film, and making at least one of the protective side plates cover one of the side surfaces of the electrode group.

8. The battery assembly method according to claim 3, characterized in that: The closed module includes a closed plate and an insulating plate. In step S4, the following steps are also included: S41, the first cover body, and / or, 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 distributed in a stepped manner is opened on the mounting boss, and a limiting step is formed between the mounting through hole and the connection window, the closing plate includes 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; S42. The closing portion is welded to the first cover plate body and / or the first wall surface, and 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 cover plate body and / or the first wall surface are butt welded, the width dimension W satisfies 0.5mm≤W≤20mm.

9. The battery assembly method according to claim 8, characterized in that: When the sealing portion and the first cover plate body and / or the first wall are through-welded, a width dimension W satisfies 1 mm ≤ W ≤ 20 mm.

10. A battery, characterized in that The battery is assembled using the battery assembly method according to any one of claims 1 to 9.

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