Battery monomer and assembly method thereof, battery and power utilization device

Abstract

The invention belongs to the technical field of batteries, and discloses a battery monomer and an assembly method thereof, a battery and a power utilization device, the battery monomer comprises a shell, a cover plate, a battery cell and a pole mounted on the cover plate, the cover plate is connected to the end part of the shell and is matched with the shell to form an accommodating space, the battery cell is arranged in the accommodating space, and the pole is mounted on the cover plate. And the battery monomer further comprises a switching piece. The switching piece comprises a pole connecting part, a tab connecting part and a deformation part connected to the pole connecting part and the tab connecting part, the deformation part can rotate around the tab connecting part and can rotate around the pole connecting part, the tab connecting part is connected to a tab of the battery cell, and the pole connecting part is connected to the pole; the inner surface of the cover plate is provided with a groove, and at least part of the switching piece is located in the groove. The battery monomer and the assembly method thereof, the battery and the power utilization device provided by the invention have relatively low assembly difficulty and relatively high space utilization rate.

Description

Technical Field

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

[0002] A battery cell generally includes a shell, a cover assembly and a battery cell. The cover assembly is installed at the opening of the shell and cooperates with the shell to form an installation space. The battery cell is installed in the installation space. The tabs of the battery cell are electrically connected to the cover assembly for input or output of electrical energy.

[0003] In the prior art, the cover plate assembly includes a cover plate, a pole mounted on the cover plate, and an adapter connected to the pole, and the pole lug of the battery cell is connected to the adapter to be connected to the pole through the adapter. The adapter in the prior art usually includes a pole connecting portion and two pole lug connecting portions connected at both ends of the pole connecting portion. The pole connecting portion is used to connect to the pole, and the pole lug connecting portion is used to connect to the pole lug. When assembling a battery cell, the pole lugs and pole lug connecting portions are usually connected first, and after the pole lugs of the two battery cells are respectively connected to the pole lug connecting portions, the pole connecting portion and the pole are connected, and the connection between the pole and the pole connecting portion is usually welded on the side of the pole connecting portion. In order to improve the space utilization of battery height, the length of the pole lug is usually designed to be shorter. When welding the pole and the pole connection, the two battery cells are in a state of being perpendicular to the cover or at a small angle to the cover. As a result, the battery cells will block the pole connection, thereby interfering with the welding of the pole-to-pole connection, increasing the difficulty of connecting the pole-to-pole connection, and thus resulting in low assembly efficiency of the battery cells. Summary of the invention

[0004] The object of the present invention is to provide a battery cell and an assembly method thereof, a battery and an electrical device, which have lower assembly difficulty and higher space utilization.

[0005] As conceived above, the technical solution adopted by the present invention is:

[0006] A battery cell, comprising a shell, a cover plate, a battery cell and a pole mounted on the cover plate, wherein the cover plate is connected to the end of the shell and cooperates with the shell to form a receiving space, wherein the battery cell is placed in the receiving space, and the battery cell further comprises:

[0007] A transfer sheet, comprising a pole connecting portion, a pole lug connecting portion, and a deformation portion connected to the pole connecting portion and the pole lug connecting portion, wherein the deformation portion can rotate around the pole lug connecting portion and can rotate around the pole connecting portion, the pole lug connecting portion is connected to the pole lug of the battery cell, and the pole connecting portion is connected to the pole;

[0008] The inner surface of the cover plate is provided with a groove, and at least a portion of the adapter plate is located in the groove.

[0009] In some embodiments, a first rotation angle α is formed between the deformation portion and the pole connection portion, and a second rotation angle β is formed between the deformation portion and the pole lug connection portion; a difference T between the first rotation angle α and the second rotation angle β satisfies: -20°≤T≤20°.

[0010] In some of these embodiments, T=0.

[0011] In some embodiments, the first rotation angle α is equal to the second rotation angle β, and 90°≤α≤170°.

[0012] In some embodiments, the rotation axis of the deformation part when rotating around the pole ear connecting part is the first rotation axis, and the rotation axis of the deformation part when rotating around the pole connecting part is the second rotation axis, and the first rotation axis and the second rotation axis both extend along the length direction of the cover plate.

[0013] In some embodiments, the height difference between the pole connection portion and the pole lug connection portion in the thickness direction of the cover plate is a first distance d1, and in the width direction of the cover plate, the distance between the outer edge of the pole lug connection portion and the outer edge of the cover plate is a second distance d2, 0.1d2≤d1≤1.2d2.

[0014] In some of these embodiments, 3 mm ≤ d2 ≤ 15 mm, and / or, 0.3 mm ≤ d1 ≤ 18 mm.

[0015] In some embodiments, the deformation portion is a rigid structure.

[0016] In some embodiments, the deformation portion is a flexible structure.

[0017] In some embodiments, the deformation portion is a telescopic structure, one end of the telescopic structure in the telescopic direction is connected to the pole connecting portion, and the other end is connected to the pole lug connecting portion.

[0018] In some embodiments, the telescopic structure includes a plurality of stacked telescopic layers, and the telescopic layers are bent to form a plurality of folds arranged along the telescopic direction.

[0019] In some embodiments, in the telescopic direction of the telescopic structure, the minimum length of the telescopic structure is L1, the maximum length is L2, L2 = (1.1-1.5) L1; wherein 1.8 mm ≤ L1 ≤ 17 mm.

[0020] In some embodiments, the tab is connected to the surface of the tab connection portion facing the cover plate; and / or,

[0021] The outer surface of the cover plate is provided with a protrusion at a position corresponding to the groove, and the pole is arranged on the protrusion; and / or,

[0022] The surface of the pole connecting portion facing away from the cover plate is located in the groove.

[0023] In some embodiments, the thickness of the deformation portion is smaller than the thickness of the pole lug connection portion and smaller than the thickness of the pole post connection portion; or, the deformation portion is provided with a weak area, and the deformation portion rotates relative to the pole lug connection portion and the pole post connection portion through the weak area; or, the deformation portion includes a plurality of deformation sheets stacked together.

[0024] In some embodiments, the adapter plate includes two pole lug connection portions, which are located on both sides of the pole connection portion in the width direction of the cover plate, and the deformation portion is connected between each pole lug connection portion and the pole connection portion.

[0025] In some embodiments, the rotation axis of the deformation part when rotating around the pole ear connecting part is the first rotation axis, and the rotation axis of the deformation part when rotating around the pole connecting part is the second rotation axis, and the first rotation axis and the second rotation axis both extend along the width direction of the cover plate.

[0026] In some embodiments, a protrusion is provided on the outer surface of the cover plate at a position corresponding to the groove, and the minimum distance between the edge of the protrusion and the shell in the width direction of the cover plate is a third distance d3, and the pole ear includes an inclined portion and a straight portion, the inclined portion is led out from the battery cell, the straight portion is connected to the pole ear connecting portion, and the minimum distance between the straight portion and the side wall of the battery cell is a fourth distance d4, 0.8d3≤d4≤2.5d3; 1mm≤d3≤10mm.

[0027] In some embodiments, the adapter includes a tab connection portion;

[0028] The battery cell is provided with one, and a tab of the battery cell is connected to any one of the two surfaces in the thickness direction of the tab connection part; or

[0029] There are two battery cells, which are arranged along the width direction of the cover plate, and the tabs of the two battery cells are symmetrically welded to two surfaces of the tab connection portion in the thickness direction.

[0030] In some embodiments, there are two poles, two adapters, each pole corresponds to one adapter, and each pole is connected to the pole connecting portion of the corresponding adapter;

[0031] Each of the adapter plates includes a pole lug connection portion, and two pole lug connection portions are connected to the same side of two pole column connection portions in the length direction of the cover plate.

[0032] In some embodiments, one of the poles comprises a pole body and an extension portion connected to each other, the extension portion is connected to one end of the pole body close to the adapter plate and extends toward the direction of the other pole, and the extension portion is connected to the corresponding pole connection portion;

[0033] The two poles are centrally symmetrically distributed along the center of the cover plate, and the symmetry axes of the two poles are parallel to the width direction of the cover plate.

[0034] In some embodiments, the pole lug connection portion includes a first connection structure, a first transition structure and a second connection structure, the deformation portion is connected between the first connection structure and the pole connection portion, the first transition structure is connected between the first connection structure and the second connection structure, there is a height difference between the first connection structure and the second connection structure, and the second connection structure is connected to the pole lug.

[0035] In some embodiments, a height difference between the first connection structure and the second connection structure is a fifth distance d5, where 0.5 mm≤d5≤4 mm.

[0036] In some embodiments, the pole connection portion and / or the first connection structure abuts against an end surface of the battery cell, and the second connection structure abuts against a bottom wall of the groove.

[0037] In some embodiments, the tab connection portion includes two second connection structures and two first transition structures, the two second connection structures are located on both sides of the first connection structure in the width direction, and are both connected to the first connection structure through one first transition structure.

[0038] In some embodiments, one end of the second connection structure is connected to the first transition structure, and the other end of the second connection structure is located on the side of the first connection structure facing away from the pole connection portion; or, one end of the second connection structure is connected to the first transition structure, and the other end of the second connection structure is located on the side of the first connection structure facing the pole connection portion.

[0039] In some embodiments, the pole connecting portion includes a third connecting structure, a fourth connecting structure and a second transition structure connected between the third connecting structure and the fourth connecting structure, there is a height difference between the third connecting structure and the fourth connecting structure, the third connecting structure is connected to the pole, and the deformation portion is connected between the fourth connecting structure and the pole ear connecting portion.

[0040] In some embodiments, the fourth connection structure and the tab connection portion are both located in the groove, and the tab connection portion abuts against a bottom wall of the groove.

[0041] In some embodiments, a height difference between the third connection structure and the fourth connection structure is a seventh distance d7, 0.5 mm≤d7≤4 mm.

[0042] In some of the embodiments, the adapter plate includes two correspondingly connected deformation portions and two tab connection portions, and the two deformation portions are connected to two sides of the fourth connection structure in the width direction thereof.

[0043] A battery cell assembly method is provided, which is used to assemble the battery cell as described above. The battery cell assembly method comprises the following steps:

[0044] Adjust the adapter to be in a lug assembly state, adjust the battery cell to be in a horizontal state, and connect the lug of the battery cell to the lug connection portion;

[0045] Connecting the pole and the pole connecting portion;

[0046] Controlling the battery cell to switch from the horizontal state to the vertical state, and at the same time pushing the pole lug connection portion to move toward the cover plate through the battery cell, so as to drive the deformation portion to rotate relative to the pole column connection portion and the pole lug connection portion;

[0047] Put the battery cell into the shell, and connect the shell and the cover plate.

[0048] A battery is provided, comprising the battery cell as described above; or the battery comprises the battery cell assembled by the battery cell assembly method as described above.

[0049] An electric device is provided, comprising the battery cell as described above; or, the electric device comprises the battery cell assembled by the battery cell assembly method as described above; or, the electric device comprises the battery as described above.

[0050] The battery cell and its assembly method, battery and power-consuming device provided by the present invention have at least the following beneficial effects:

[0051] The adapter includes a pole connecting portion, a pole ear connecting portion and a deformation portion. The deformation portion can rotate around the pole ear connecting portion and the pole connecting portion, so that the relative position of the pole ear connecting portion and the pole connecting portion can be adjusted. When welding the pole connecting portion and the pole, the battery cell can be in a horizontal state, that is, the battery cell can be in a state parallel to the cover plate, so that the battery cell will not block the pole connecting portion and will not interfere with the welding of the pole connecting portion and the pole, thereby reducing the difficulty of connecting the pole connecting portion and the pole, and thus reducing the difficulty of assembling the battery cell. By providing a groove on the cover plate, at least part of the pole ear connecting portion can be located in the groove, thereby improving the space utilization rate of the battery cell, so that the battery cell can have a higher capacity.

[0052] Furthermore, when welding the pole and the pole connection part, the pole ear connection part and the pole connection part are not welded on the same plane. This is conducive to the welding equipment to identify and locate the welding areas of the two; and it can avoid the two welding areas affecting each other due to their proximity to each other, resulting in welding quality problems such as welding explosion points in the welding area of ​​the later welding. The battery cell provided in this embodiment has high welding quality during welding.

[0053] In addition, the battery cell assembly method provided by the present invention does not require the addition of additional processes or the use of additional devices. The pole tab connection portion can be driven to rotate by utilizing the movement of the battery cell during the cell assembly process, thereby improving assembly efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0054] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments of the present invention. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the contents of the embodiments of the present invention and these drawings without paying any creative work.

[0055] Figure 1 is a schematic structural diagram of a battery cell provided in Embodiment 1 of the present invention;

[0056] Figure 2 is a cross-sectional view of a battery cell provided in Embodiment 1 of the present invention;

[0057] Figure 3 The present invention Figure 2 The enlarged view of point A is shown;

[0058] Figure 4 is a schematic diagram of the assembly of a battery cell provided in the first embodiment of the present invention;

[0059] Figure 5 The present invention Figure 4 The enlarged view of point B is shown;

[0060] Figure 6 is a schematic structural diagram of a cover plate provided in Embodiment 1 of the present invention;

[0061] Figure 7 is a first structural schematic diagram of the adapter provided in the first embodiment of the present invention;

[0062] Figure 8 is a second structural schematic diagram of the adapter provided in the first embodiment of the present invention;

[0063] Fig. 9 is an exploded view of the adapter provided in the first embodiment of the present invention;

[0064] Fig.10 is a cross-sectional view of a battery cell provided in Embodiment 2 of the present invention;

[0065] Fig.11 The present invention Fig.10 The enlarged view of point E is shown;

[0066] Fig.12 is a first structural schematic diagram of an adapter provided by Embodiment 2 of the present invention;

[0067] Fig.13 is a diagram of different states of the adapter provided by the second embodiment of the present invention during assembly;

[0068] Fig.14 is another different state diagram of the adapter provided by the second embodiment of the present invention during assembly;

[0069] Fig.15 is a schematic diagram of the assembly of a battery cell provided in the second embodiment of the present invention;

[0070] Fig.16 is a schematic diagram of the structure of a battery cell provided in Embodiment 3 of the present invention;

[0071] Fig.17 is an exploded schematic diagram of a battery cell provided in Embodiment 3 of the present invention;

[0072] Fig.18 is a first structural schematic diagram of an adapter provided by Embodiment 3 of the present invention;

[0073] Fig.19 is a cross-sectional view of a battery cell provided in Embodiment 3 of the present invention;

[0074] Fig. 20 The present invention Fig.19 The enlarged schematic diagram of point C shown;

[0075] Fig.21 is a first partial enlarged view of a battery cell provided in the third embodiment of the present invention;

[0076] Fig. 22 is a schematic diagram of the structure of a battery cell provided by a fourth embodiment of the present invention;

[0077] Fig.23 is an exploded view of a battery cell provided in Embodiment 4 of the present invention;

[0078] Fig.24 is a schematic diagram of the structure of a battery cell provided in Embodiment 6 of the present invention;

[0079] Fig.25 is an exploded view of a battery cell provided in Embodiment 6 of the present invention;

[0080] Fig.26 is a schematic diagram of the structure of a battery cell provided by Embodiment 8 of the present invention;

[0081] Fig. 27 is a schematic structural diagram of a battery cell without a cover plate provided in Embodiment 8 of the present invention;

[0082] Fig.28 is a first structural schematic diagram of an adapter provided by Embodiment 8 of the present invention;

[0083] Fig.29 is a first top view of the adapter provided by Embodiment 8 of the present invention;

[0084] Fig.30 is a first side view of the adapter provided by Embodiment 8 of the present invention;

[0085] Fig.31 is a first partial cross-sectional view of a battery cell provided by Embodiment 8 of the present invention;

[0086] Fig.32 is a second partial cross-sectional view of a battery cell provided by Embodiment 8 of the present invention;

[0087] Fig.33 is a third partial cross-sectional view of a battery cell provided in Embodiment 8 of the present invention;

[0088] Fig.34 is a first assembly schematic diagram of a battery cell provided in Embodiment 8 of the present invention;

[0089] Fig.35 is a second structural schematic diagram of the adapter provided by Embodiment 8 of the present invention;

[0090] Fig.36 is a second top view of the adapter provided by the eighth embodiment of the present invention;

[0091] Fig.37 is a second side view of the adapter provided by the eighth embodiment of the present invention;

[0092] Fig.38is a schematic diagram of a pole connection portion provided by Embodiment 8 of the present invention when it is flush with the first connection structure;

[0093] Fig.39 is a fourth partial cross-sectional view of a battery cell provided in Embodiment 8 of the present invention;

[0094] Fig.40 is a fifth partial cross-sectional view of a battery cell provided in Embodiment 8 of the present invention;

[0095] Fig.41 is a second assembly schematic diagram of a battery cell provided in Embodiment 8 of the present invention;

[0096] Fig.42 is a schematic structural diagram of a battery cell without a cover plate provided in Embodiment 9 of the present invention;

[0097] Fig.43 is a schematic diagram of the structure of the adapter provided by Embodiment 9 of the present invention;

[0098] Fig.44 is a top view of the adapter provided by Embodiment 9 of the present invention;

[0099] Fig.45 is a side view of the adapter provided by Embodiment 9 of the present invention;

[0100] Fig.46 is a first partial cross-sectional view of a battery cell provided by Embodiment 9 of the present invention;

[0101] Fig.47 is a second partial cross-sectional view of a battery cell provided by Embodiment 9 of the present invention;

[0102] Fig.48 It is a schematic diagram of the assembly of a battery cell provided in the ninth embodiment of the present invention.

[0103] In the figure:

[0104] 1. Shell; 2. Cover plate; 21. Groove; 22. Protrusion; 3. Cell; 31. Ear; 311. Inclined portion; 3111. First inclined edge; 3112. Second inclined edge; 312. Straight portion; 4. Pole; 41. Pole body; 42. Extension portion;

[0105] 5. Adapter plate; 51. Pole connecting part; 511. Third connecting structure; 512. Fourth connecting structure; 513. Second transition structure; 514. First overlapping part; 52. Ear connecting part; 521. First connecting structure; 522. First transition structure; 523. Second connecting structure; 524. Second overlapping part; 525. Arc surface; 53. Deformation part; 531. Weak area; 532. Deformation plate; 54. Telescopic structure; 541. Telescopic layer; 5411. Wrinkle; 6. Lower insulating member; 61. Protruding structure; 62. Accommodating groove; X, first direction; Y, second direction; Z, third direction; O, symmetry axis. DETAILED DESCRIPTION

[0106] In order to make the technical problems solved by the present invention, the technical solutions adopted and the technical effects achieved clearer, the technical solutions of the present invention are further described below in conjunction with the accompanying drawings and through specific implementation methods. It is 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 the convenience of description, only the parts related to the present invention are shown in the accompanying drawings, not all.

[0107] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0108] 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.

[0109] In the present invention, unless otherwise clearly stipulated and limited, the first feature being "above" or "below" the second feature may include the first and second features being in direct contact, or may include the first and second features not being in direct contact but being in contact through another feature between them. Moreover, the first feature being "above", "above" and "above" the second feature includes the first feature being directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. The first feature being "below", "below" and "below" the second feature includes the first feature being directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature. In the description of this embodiment, unless otherwise specified, "multiple" specifically refers to two or more.

[0110] 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.

[0111] It should be noted that when an element is referred to as being “fixed to” or “disposed on” another element, it may be directly on the other element or there may be a central element.

[0112] The inventors found that in order to improve the height space utilization of the battery, a protrusion is usually set on the outer surface of the cover plate, and a groove is correspondingly set on the inner surface, and the adapter and the pole ear connected to the adapter are accommodated by the groove. However, under the conventional welding method (first, the battery cell pole ear and the pole ear connection part of the adapter are welded in the horizontal state of the battery cell, and then the pole connection part of the adapter and the pole are welded, and finally the horizontal state of the battery cell is changed to the vertical state for core closure), due to the short length of the pole ear, when welding the pole connection part and the pole, the battery cell cannot be placed horizontally, resulting in the battery cell blocking the pole connection part, thereby interfering with the welding of the pole connection part. To solve the interference problem, the inventors tried to increase the length of the pole ear. However, the inventors found that after increasing the length of the pole ear, the groove cannot effectively accommodate the pole ear, which violates the starting point of "improving the height space utilization of the battery". In addition, as the length of the pole ear increases, the redundancy of the pole ear increases, resulting in an increased risk of inverted insertion of the pole ear and tearing of the pole ear. After in-depth research and a large number of experiments, the inventor proposed a technical solution that takes into account both high space utilization and low assembly difficulty.

[0113] The technical solution of the present invention is further described below with reference to the accompanying drawings and through specific implementation methods.

[0114] In a first aspect, the present embodiment provides a battery cell that can have a high assembly efficiency and a high space utilization rate. The battery cell provided by the present embodiment includes multiple embodiments, which will be explained one by one below.

[0115] Embodiment 1

[0116] like Figures 1 to 3 As shown, the battery cell provided in this embodiment includes a housing 1, a cover plate 2, a battery cell 3, a pole 4 and a switching plate 5. Figure 1As shown, the battery cell is in the shape of a cuboid. For the sake of convenience, in this embodiment, the length direction of the battery cell is defined as the first direction X, the width direction of the battery cell is defined as the second direction Y, and the height direction of the battery cell is positioned as the third direction Z. The length of the battery cell is greater than its width and height. In this embodiment, the length direction of the shell 1 and the length direction of the cover plate 2 are both the first direction X, the width direction of the shell 1 and the width direction of the cover plate 2 are both the second direction Y, and the height direction of the shell 1, the height direction of the battery cell 3, the thickness direction of the cover plate 2, and the height direction of the pole 4 are all the third direction Z.

[0117] The pole 4 is mounted on the cover plate 2, which is connected to the end of the shell 1, specifically to the open end of the shell 1, and cooperates with the shell 1 to form an accommodation space. The battery cell 3 is placed in the accommodation space, and the end of the battery cell 3 facing the cover plate 2 has a pole ear 31.

[0118] like Figure 3 As shown, the adapter plate 5 is arranged on the side of the cover plate 2 facing the battery cell 3, and the adapter plate 5 includes a pole connection portion 51, a pole lug connection portion 52, and a deformation portion 53 connected between the pole connection portion 51 and the pole lug connection portion 52. It should be noted that the pole lug connection portion 52, the deformation portion 53 and the pole connection portion 51 are electrically connected in sequence to realize the transmission of electric energy. Among them, the deformation portion 53 can rotate around the pole lug connection portion 52 and can rotate around the pole connection portion 51, so that the relative position of the pole lug connection portion 52 and the pole connection portion 51 can be changed. The pole lug connection portion 52 in this embodiment is connected to the pole lug 31 of the battery cell 3, and the pole connection portion 51 is connected to the pole 4, so that the battery cell 3 is connected to the pole 4 through the pole lug 31 and the adapter plate 5 to realize the input and output of electric energy.

[0119] The surface of the cover plate 2 facing the battery cell 3 is the inner surface. For example, Figure 3 and Figure 6 As shown, a groove 21 is provided on the inner surface of the cover plate 2, and at least a portion of the adapter plate 5 is located in the groove 21 so as to be accommodated by the groove 21, thereby reducing the occupation of the accommodating space by the adapter plate 5, so that the gap between the battery cell 3 and the cover plate 2 can be smaller, thereby improving the space utilization of the battery cell, so that the battery cell 3 in the battery cell of the same size can be higher, thereby improving the capacity of the battery cell, so that the battery and electrical device using the battery cell can have a higher energy density.

[0120] When assembling the battery cell provided in this embodiment, the tab 31 and the tab connection portion 52 may be welded first. Figure 4As shown, the battery cell 3 can be in a horizontal state, and welding is performed in a direction perpendicular to the pole lug connection portion 52. The welding position is located on one side of the battery cell 3, and the battery cell 3 will not be damaged. Next, the pole connection portion 51 and the pole 4 are welded. At this time, since the pole lug connection portion 52 can be rotated relative to the deformation portion 53, the pole lug connection portion 52 can be located on the side of the pole connection portion 51 away from the cover plate 2, that is, the pole lug connection portion 52 is lower than the pole connection portion 51. At this time, the battery cell 3 is located below the cover plate 2, which can ensure that the battery cell 3 is still in a flat state (i.e., horizontal state). When welding, welding is performed in a direction perpendicular to the pole connection portion 51, and the battery cell 3 will not block the welding of the pole connection portion 51 and the pole 4. After that, the battery cell 3 is rotated 90° so that the battery cell 3 moves from the horizontal state to the vertical state, and the battery cell 3 pushes the pole ear connection part 52 to move close to the cover plate 2. At this time, the deformation part 53 rotates relative to the pole column connection part 51 and the pole ear connection part 52 until the pole ear 31 and the pole ear connection part 52 enter the groove 21 and abut against the bottom wall of the groove 21. Finally, the battery cell 3 is controlled to be installed in the housing 1, and the cover plate 2 and the housing 1 are welded to obtain a battery cell.

[0121] In some embodiments, when the entirety of the tab connection portion 52 and the tab 31 is located in the groove 21 and abuts against the bottom wall of the groove 21, as shown in FIG. Figure 3 As shown, the tab connection portion 52 may be higher than the pole connection portion 51, that is, the tab connection portion 52 is located above the pole connection portion 51. Of course, it can be understood that the tab connection portion 52 may also be located in the same plane as the pole connection portion 51, and this embodiment does not limit this.

[0122] It can be understood that in the above-mentioned assembly process, the welding order of the pole lug 31, the pole 4 and the adapter 5 can be adjusted according to actual needs. For example, the pole connecting part 51 and the pole 4 can be welded first, and then the pole lug connecting part 52 and the pole lug 31 can be welded; or the pole connecting part 51 and the pole 4, and the pole lug connecting part 52 and the pole lug 31 can be welded at the same time, which is not limited to the present embodiment.

[0123] It can be seen that in this embodiment, the "up and down movement of the battery cell 3 relative to the cover plate 2" is achieved by moving the tab connection portion 52 of the adapter plate 5 up and down. When the pole connection portion 51 of the adapter plate 5 is welded to the pole 4, the tab connection portion 52 is lower than the pole connection portion 51 to avoid interference between the battery cell 3 and the cover plate 2. After welding, the tab connection portion 52 is pushed upward to move the tab connection portion 52 into the groove 21 of the cover plate 2, so that the cover plate 2 can accommodate the adapter plate 5, thereby ensuring high space utilization and solving the problem of interference between the cover plate 2 and the battery cell 3 affecting the welding of the adapter plate 5 and the pole 4.

[0124] In the battery cell provided in this embodiment, the adapter plate 5 includes a pole connecting portion 51, a pole ear connecting portion 52 and a deformation portion 53. The deformation portion 53 can rotate around the pole ear connecting portion 52 and the pole connecting portion 51, so that the relative position of the pole ear connecting portion 52 and the pole connecting portion 51 can be adjusted. When welding the pole connecting portion 51 and the pole 4, the battery cell 3 can be in a horizontal state, that is, the battery cell 3 can be in a state parallel to the cover plate 2, so that the battery cell 3 will not block the pole connecting portion 51, and will not interfere with the welding of the pole connecting portion 51 and the pole 4, thereby reducing the difficulty of connecting the pole connecting portion 51 and the pole 4, and further reducing the difficulty of assembling the battery cell. By providing a groove 21 on the cover plate 2, at least part of the pole ear connecting portion 52 can be located in the groove 21, thereby improving the space utilization rate of the battery cell, so that the battery cell can have a higher capacity.

[0125] Furthermore, when the pole 4 and the pole connection part 51 are welded, the pole ear connection part 52 and the pole connection part 51 are not welded on the same plane. This is conducive to the welding equipment to identify and locate the welding areas of the two; and it can avoid the two welding areas affecting each other due to their proximity to each other, resulting in welding quality problems such as welding explosion points in the welding area of ​​the later welding. The battery cell provided in this embodiment has higher welding quality during welding.

[0126] In addition, the battery cell assembly method provided in this embodiment does not require the addition of additional processes or the use of additional devices. The tab connection portion 52 can be driven to rotate by utilizing the movement of the battery cell 3 during the cell assembly process, thereby improving assembly efficiency.

[0127] In some possible implementations, such as Figure 3 As shown, the battery cell further includes a lower insulating member 6, which is made of an insulating material and is used for insulation between the cover plate 2 and the battery cell 3. Figure 5 As shown, the lower insulating member 6 is provided with a protruding structure 61 that matches the groove 21 of the cover plate 2, and the protruding structure 61 forms a receiving groove 62 on the bottom surface of the lower insulating member 6. The protruding structure 61 of the lower insulating member 6 is inserted into the groove 21 of the cover plate 2, and the adapter plate 5 and the pole lug 31 are accommodated in the receiving groove 62 of the lower insulating member 6. The pole 4 is connected to the pole connecting portion 51 after passing through the lower insulating member 6. The integral structure composed of the pole lug connecting portion 52 and the pole lug 31 directly abuts against the bottom wall of the receiving groove of the lower insulating member 6, so as to indirectly abut against the bottom wall of the groove 21 of the cover plate 2. In other possible implementations, the lower insulating member may not be provided on the inner side of the cover plate 2. For example, an insulating material may be coated on the bottom of the groove 21 of the cover plate 2 to replace the lower insulating member 6, and this embodiment is not limited to this.

[0128] In this embodiment, the angle between the deformation part 53 and the pole connection part 51 depends on the size of the pole connection part 51 abutting against the pole 4 (i.e., the area of ​​the pole connection part 51 welded with the pole 4), and the angle between the deformation part 53 and the pole lug connection part 52 depends on the size of the pole lug connection part 52 abutting against the pole lug 31 (i.e., the area of ​​the pole lug connection part 52 welded with the pole lug 31). The smallest size of the pole connection part 51 and the pole lug connection part 52 is the size of the weld mark. Since the clamp needs to be pressed during welding, the size of the pole connection part 51 and the pole lug connection part 52 is slightly larger than the weld mark size. When the pole connection part 51 takes the minimum value, the angle between the deformation part 53 and the pole connection part 51 reaches the maximum; when the pole lug connection part 52 takes the minimum value, the angle between the deformation part 53 and the pole lug connection part 52 reaches the maximum. The larger the size of the tab connection part 52, the smaller the angle between the tab connection part 52 and the deformation part 53, and the larger the size of the pole connection part 51, the smaller the angle between the pole connection part 51 and the deformation part 53. In order to ensure that the deformation part 53 is bent well and the battery cell 3 applies force upward, the tab connection part 52 and the deformation part 53 can move upward, and the angle between the deformation part 53 and the pole connection part 51 is greater than or equal to 90°, and the angle between the deformation part 53 and the tab connection part 52 is greater than or equal to 90°.

[0129] In some embodiments, such as Figure 7 As shown, a first angle α is formed between the deformed portion 53 and the pole connecting portion 51, and a second angle β is formed between the deformed portion 53 and the pole lug connecting portion 52. In order to ensure the size of the weld mark and facilitate the clamp to press the adapter 5 and the pole lug 31 during welding, 90°≤α≤170°, 90°≤β≤170°. In some embodiments, 100°≤α≤150°, 100°≤β≤150°. For example, the first angle α is 90°, 100°, 110°, 120°, 130°, 140°, 150°, 160°, 170°, etc. The second angle β is 90°, 100°, 110°, 120°, 130°, 140°, 150°, 160°, 170°, etc.

[0130] In order to ensure that the pole connection portion 51 and the pole lug connection portion 52 are parallel or approximately parallel, illustratively, the first angle α and the second angle β are equal. Due to the manufacturing error of the adapter 5, the first angle α and the second angle β are not completely equal. In this embodiment, it is necessary to ensure that the difference between the first angle α and the second angle β is within a certain range. In some embodiments, the difference T between the first angle α and the second angle β satisfies: -20°≤T≤20°. Exemplarily, -10°≤T≤10°. For example, the difference T between the first angle α and the second angle β is -20°, -10°, 0°, 10°, 15°, 20°. Among them, when the first angle α and the second angle β are equal, T=0.

[0131] In this embodiment, the adapter sheet 5 includes an assembled state and an unassembled state. Figure 2 , Figure 3 , Figure 8 and Fig. 9 2 is a schematic diagram of the adapter plate 5 in an assembled state. At this time, the adapter plate 5 is located in the groove 21 . Figure 5 and Figure 7 It is a schematic diagram of the adapter plate 5 in an unassembled state. At this time, the tab connection portion 52 of the adapter plate 5 is not located in the groove 21 .

[0132] In order to make the tab 31 shorter, for example, Figure 7 As shown, when the adapter 5 is in the assembled state, the height difference between the pole connecting portion 51 and the pole tab connecting portion 52 in the thickness direction of the cover plate 2 (ie, the third direction Z) is a first distance d1. Figure 2 As shown, when the adapter 5 is in the assembled state, in the width direction of the cover plate 2 (i.e., the second direction Y), the distance between the outer edge of the pole lug connection portion 52 and the outer edge of the cover plate 2 is set as the second distance d2. In the second direction Y, the distance between the outer edge of the pole lug connection portion 52 and the outer edge of the cover plate 2 is the distance between the edge of the pole lug connection portion 52 away from the pole connection portion 51 and the outer edge of the cover plate 2 closest to it, that is, the distance between the outer edge of the pole lug connection portion 52 and the outer edge of the cover plate 2 located on the same side of the pole 4.

[0133] It should be noted that the height difference between the pole connection portion 51 and the tab connection portion 52 in the third direction Z is related to the distance between the outer edge of the tab connection portion 52 and the outer edge of the cover plate 2. Because the first distance d1 increases, the size of the adapter 5 in the second direction Y becomes smaller, so that the welding position of the tab connection portion 52 and the tab 31 is close to the middle of the cover plate 2 in the second direction Y. When the tab 31 is a multi-layer structure and there are two battery cells 3, the side of one battery cell 3 close to the other battery cell 3 is called the inner side of the battery cell 3, and the side opposite to the inner side is the outer side of the battery cell 3. When the welding position of the tab connection portion 52 and the tab 31 is close to the middle of the cover plate 2 in the second direction Y, the required inner tab 31 (the tab 31 farther away from the housing 1) is longer, and the required outer tab 31 (the tab 31 closer to the housing 1) is shorter. Therefore, as the first distance d1 increases, the second distance d2 also increases, so that the inner pole ear 31 becomes longer and the outer pole ear 31 becomes shorter. In this embodiment, the relationship between the first distance d1 and the second distance d2 satisfies: 0.1d2≤d1≤1.2d2. In some embodiments, 0.3d2≤d1≤0.8d2. For example, d1=0.1d2, d1=0.2d2, d1=0.3d2, d1=0.4d2, d1=0.5d2, d1=0.6d2, d1=0.7d2, d1=0.8d2, d1=0.9d2, d1=1.0d2, d1=1.1d2, d1=1.2d2.

[0134] In this embodiment, the first distance d1 and the second distance d2 satisfy the above relationship, so that the tabs 31 of the battery cell provided in this embodiment can be made very short, thereby avoiding the stacking of the tabs 31, further reducing the space waste caused by the length of the tabs 31, and ensuring that all the tabs 31 can be accommodated in the groove 21.

[0135] In this embodiment, the value of the second distance d2 is related to the width of the battery cell 3. For example, 3mm≤d2≤15mm, and according to the relationship between the first distance d1 and the second distance d2, 0.3mm≤d1≤18mm. In some embodiments, 0.9mm≤d1≤12mm.

[0136] Typically, a battery cell includes two poles 4 and two adapters 5 , the poles 4 and adapters 5 are connected in a one-to-one correspondence, one adapter 5 is electrically connected to the positive electrode ear of the battery cell 3 , and the other adapter 5 is electrically connected to the negative electrode ear of the battery cell 3 .

[0137] For example, Figure 2 and Figure 4 As shown, two battery cells 3 are arranged in the housing 1 in this embodiment, and the two battery cells 3 are arranged opposite to each other in the second direction Y. Figure 8As shown, each adapter 5 includes two tab connections 52, which are located on both sides of the pole connection 51 in the width direction of the cover plate 2 (i.e., the second direction Y), and a deformation portion 53 is connected between each tab connection 52 and the pole connection 51, that is, there are two tab connections 52 and two deformation portions 53, and the two deformation portions 53 are connected to the two ends of the pole connection 51 in the second direction Y, and the two tab connections 52 are correspondingly connected to the two deformation portions 53. The tabs 31 of the two battery cells 3 with the same polarity are correspondingly connected to the two tab connections 52 of one adapter 5.

[0138] It can be understood that the number of the grooves 21 on the cover plate 2 is the same as the number of the adapter plates 5, that is, two grooves 21 are provided on the cover plate 2. In some embodiments, the two grooves 21 in this embodiment are centrally symmetrically arranged, the two poles 4 are also centrally symmetrically arranged, the two adapter plates 5 are also centrally symmetrically arranged, and the symmetry axis O extends along the width direction of the cover plate 2. In other embodiments, the number of the grooves 21 can be 1, and the two adapter plates 5 are installed in the same groove.

[0139] For example, Figure 3 As shown, the pole lug 31 is connected to the surface of the pole lug connection part 52 facing the cover plate 2. In this way, the pole lug connection part 52 and the cover plate 2 (specifically, the bottom wall of the groove 21) cooperate with each other to clamp the pole lug 31, so that the pole lug connection part 52 supports and limits the pole lug 31, preventing the pole lug 31 from being loose or the pole lug 31 from being inserted upside down into the battery cell 3; and the pole lug 31 is fixed on the surface of the pole lug connection part 52 facing the cover plate 2, so that the pole lug 31 can also be accommodated in the groove 21, further improving the space utilization of the battery cell. In this embodiment, the end surface of the pole lug connection part 52 away from the deformation part 53 is an arc surface, and the pole lug 31 bypasses the arc surface and connects to the surface of the pole lug connection part 52 facing the cover plate 2 to prevent the pole lug connection part 52 from scratching the pole lug 31.

[0140] It is understandable that the pole lug 31 can also be connected to the surface of the pole lug connection portion 52 facing away from the cover plate 2. When the pole lug 31 is a multi-layer structure, part of the pole lug 31 can also be connected to the surface of the pole lug connection portion 52 facing the cover plate 2, and part of the pole lug 31 can be connected to the surface of the pole lug connection portion 52 facing away from the cover plate 2, that is, the pole lug connection portion 52 is sandwiched between the multiple layers of pole lugs 31, which is not limited in this embodiment.

[0141] In order to make the end surface of the battery cell 3 facing the cover plate 2 abut against the cover plate 2, in this embodiment, the pole ear connection portion 52, the pole column connection portion 51 and the deformation portion 53 are all located in the groove 21, that is, Figure 3As shown, the surface of the pole lug connection part 52 facing away from the cover plate 2 and the surface of the pole connection part 51 facing away from the cover plate 2 are both located in the groove 21. In this way, the top end surface of the battery cell 3 can abut against the inner surface of the cover plate 2, so that the cover plate 2 and the shell 1 cooperate with each other to limit the movement of the battery cell 3 in the third direction Z, thereby preventing the battery cell 3 from jumping in the shell 1, and improving the reliability of fixing the battery cell 3.

[0142] In one possible embodiment, Figure 1 As shown, a protrusion 22 is provided on the outer surface of the cover plate 2 at a position corresponding to the groove 21, and the pole 4 is provided on the protrusion 22, so that the pole 4 is connected to the pole connecting portion 51 in the groove 21. By providing the protrusion 22, the cover plate 2 does not need to be thick, which reduces the weight of the cover plate 2, thereby making the weight of the battery cell smaller. The number of protrusions 22 and grooves 21 corresponds one to one.

[0143] like Figure 7 As shown, the deformation portion 53 in this embodiment is located between the pole lug connection portion 52 and the pole column connection portion 51 in the second direction Y. Among them, the rotation axis of the deformation portion 53 when rotating around the pole lug connection portion 52 is the first rotation axis (not shown in the figure), and the rotation axis of the deformation portion 53 when rotating around the pole column connection portion 51 is the second rotation axis (not shown in the figure), and both the first rotation axis and the second rotation axis extend along the length direction of the cover plate 2 (i.e., the first direction X). Exemplarily, the intersection of the deformation portion 53 and the pole lug connection portion 52 is the first rotation axis, and the intersection of the deformation portion 53 and the pole column connection portion 51 is the second rotation axis.

[0144] For example, Figure 8 and Fig. 9 As shown, the widths of the tab connection portion 52 , the deformation portion 53 and the pole connection portion 51 are the same, that is, the dimensions of the tab connection portion 52 , the deformation portion 53 and the pole connection portion 51 in the first direction X are the same, so as to facilitate assembly.

[0145] In some possible implementations, the deformation portion 53 is a rigid structure, that is, the deformation portion 53 itself does not deform, but rotates relative to the pole connecting portion 51 and the pole tab connecting portion 52 .

[0146] The specific structure of the deformation part 53 can be various. This embodiment provides a deformation part 53 with the following three structures.

[0147] In the first structure of the deformation portion 53, as shown in FIG. Fig. 9As shown, the deformation portion 53 includes a plurality of stacked deformation sheets 532. Both ends of each deformation sheet 532 are connected to the pole connection portion 51 and the pole lug connection portion 52, and two adjacent layers of deformation sheets 532 are not connected, so as to provide space for the movement of each deformation sheet 532, so as to facilitate the rotation of each deformation sheet 532 relative to the pole connection portion 51 and the pole lug connection portion 52, thereby facilitating the pole lug connection portion 52 to move into the groove 21. In this embodiment, the thickness of each deformation sheet 532 can be relatively thin.

[0148] In the second structure of the deformation portion 53, as shown in FIG. Figure 7 As shown, the deformation portion 53 is provided with a weak area 531, and the deformation portion 53 rotates relative to the pole lug connection portion 52 and the pole column connection portion 51 through the weak area 531. By providing the weak area 531, it is easy for the deformation portion 53 to rotate relative to the pole column connection portion 51 and the pole lug connection portion 52, thereby improving the success rate of assembly.

[0149] For example, the weak area 531 may be formed by material thinning, punching or other methods, which is not limited in this embodiment.

[0150] In the third structure of the deformation portion 53 , the thickness of the deformation portion 53 is smaller than the thickness of the pole tab connection portion 52 and smaller than the thickness of the pole connection portion 51 .

[0151] For example, Fig. 9 As shown, the pole connection portion 51 may be provided with a first overlap portion 514, the thickness of the first overlap portion 514 is less than the thickness of the pole connection portion 51. The pole tab connection portion 52 is provided with a second overlap portion 524, the thickness of the second overlap portion 524 is less than the thickness of the pole tab connection portion 52, one end of the deformation portion 53 overlaps the first overlap portion 514, and the other end overlaps the second overlap portion 524, so that it can be supported by the first overlap portion 514 and the second overlap portion 524, thereby improving the connection strength and reliability of the deformation portion 53 with the pole connection portion 51 and the pole tab connection portion 52.

[0152] In some of the embodiments, the thickness of the deformation portion 53 is smaller than the thickness of the pole lug connection portion 52 and smaller than the thickness of the pole connection portion 51, and the thickness of the deformation portion 53 satisfies: the sum of the thicknesses of the first lap portion 514 and the deformation portion 53 is equal to the thickness of the pole connection portion 51, and the sum of the thicknesses of the second lap portion 524 and the deformation portion 53 is equal to the thickness of the pole lug connection portion 52, so that the surface of the pole lug connection portion 52 and the surface of the pole connection portion 51 are relatively flat, which facilitates the welding of the pole lug connection portion 52 and the pole lug 31, and also facilitates the welding of the pole connection portion 51 and the pole 4.

[0153] Of course, it can be understood that the structure of the deformation portion 53 is not limited to the above three structures, and the above three structures of the deformation portion 53 can also be combined with each other, and can be selected according to actual needs.

[0154] Embodiment 2

[0155] The battery cell provided in this embodiment is different from that in the first embodiment in that the structure of the deformation portion 53 is different.

[0156] Specifically, Figures 10 to 15 As shown, the deformation portion 53 in this embodiment is a flexible structure, that is, the deformation portion 53 can not only rotate relative to the pole connecting portion 51 and the pole lug connecting portion 52, but also can deform itself.

[0157] For example, Fig.12 As shown, the deformation portion 53 is a telescopic structure 54. One end of the telescopic structure 54 in the telescopic direction is connected to the pole connecting portion 51, and the other end is connected to the pole lug connecting portion 52. The telescopic structure 54 can be telescopic, so that the spacing between the pole lug connecting portion 52 and the pole connecting portion 51 is adjustable, so that when the pole lug connecting portion 52 moves in the thickness direction of the cover plate 2 (i.e., the third direction Z), it will not pull the pole lug 31 due to the need to move along the width direction of the cover plate 2 (i.e., the second direction Y), thereby reducing the probability of failure of the pole lug 31 and improving the assembly effect of the battery cell.

[0158] Fig.13 and Fig.14 The schematic diagram of the adapter sheet 5 provided in this embodiment is in three states. Fig.13 Figure (a) is a schematic diagram when the pole lug connection portion 52 has not entered the groove 21. At this time, the pole lug connection portion 52 is located below the pole connection portion 51. In this state, the pole 4 and the pole connection portion 51 can be welded, and the pole lug 31 and the pole lug connection portion 52 can be welded. Fig.13 Figure (three) in the figure is a schematic diagram of the pole tab connection portion 52 being located in the groove 21. At this time, the pole tab connection portion 52 is located above the pole connection portion 51. Fig.13 Figure (ii) is a schematic diagram of the case where the pole ear connection portion 52 and the pole connection portion 51 are coplanar. Fig.13 Figure (a) in the state, after Fig.13 The state of Figure (2) changes to Fig.13 The state shown in Figure (3) is shown in Figure 3. The adapter 5 is in Fig.13 In the state of FIG. (ii), in order to avoid pulling the tab 31, the tab connection portion 52 will squeeze the telescopic structure 54. At this time, the length that can accommodate the telescopic structure 54 is the shortest, so the telescopic structure 54 is in the maximum contraction state. Fig.13 In the state of Figure (I), the length of the telescopic structure 54 is not limited by the groove 21 and the position of the battery cell 3, and the length of the telescopic structure 54 can be accommodated to the maximum, the contraction of the telescopic structure 54 is minimized, and the telescopic structure 54 is almost in a straight state. Fig.13 In the state of Figure (iii), the telescopic structure 54 needs to shrink to a certain extent due to the position of the battery cell 3, but the shrinkage degree is less than that when the adapter 5 is in Fig.13 The degree of contraction in the state shown in Figure (b).

[0159] For example, in the telescopic direction of the telescopic structure 54, Fig.13 and Fig.14 As shown, the minimum length of the telescopic structure 54 is L1, and the maximum length is L2. Based on the internal and external redundancy calculation of the length of the pole ear 31, the height difference b between the pole ear connection portion 52 in the state of Figure (2) and the state of Figure (1) generally needs to be between 2mm and 8mm. Depending on the width of the groove 21, the b value is slightly different, and the ratio of the longest extension of the telescopic structure 54 to the shortest extension can be 1.1 to 1.5, that is, L2 = 1.1L1 to 1.5L1. Fig.14 As shown, L1, L2, and b satisfy the relationship: L1 2 +b 2 =L2 2 ;

[0160] When b = 2 mm, L2 = 1.1L1, L1 = 17 mm;

[0161] When b = 2 mm, L2 = 1.5L1, L1 = 7.2 mm;

[0162] When b = 8 mm, L2 = 1.1L1, L1 = 4.2 mm;

[0163] When b = 8 mm, L2 = 1.5L1, L1 = 1.8 mm;

[0164] To sum up, L1 can be 1.8mm~17mm, and L2 can be 1.1L1~1.5L1.

[0165] In order to reduce the length of L1 as much as possible, that is, reduce the length of the adapter plate 5 and reduce the cost, when b is larger, L2 should also be larger than L1, that is, when b=8mm, L2 should be 1.5L1. L1=7.2mm.

[0166] Therefore, further, 1.8mm≤L1≤17mm, L2=(1.1~1.5)L1, and b can be 2mm~8mm. For example, the value of L1 is 1.8mm, 2mm, 4.2mm, 5mm, 7.2mm, 8mm, 12mm, 17mm, etc. The value of b is 2mm, 4mm, 6mm, 8mm, etc.

[0167] In some possible implementations, please continue to see Fig.13The telescopic structure 54 includes a plurality of telescopic layers 541 stacked in layers, each of which is bent to form a plurality of folds 5411 arranged along the telescopic direction, so as to achieve telescopic movement of the telescopic structure 54. By configuring the telescopic structure 54 to include a plurality of telescopic layers 541, the structural strength of the telescopic structure 54 can be improved, the difficulty of telescopic movement of the telescopic structure 54 can be reduced, and the assembly of the battery cell can be facilitated.

[0168] Exemplarily, the telescopic layer 541 may be a metal sheet, and the thickness of each telescopic layer 541 is in the range of 0.05 mm to 0.2 mm. The telescopic layer 541 is thicker and not easy to telescope; the telescopic layer 541 is thinner and is easy to break. For example, the thickness of the telescopic layer 541 is 0.05 mm, 0.08 mm, 0.1 mm, 0.15 mm, 0.2 mm, etc.

[0169] When assembling the battery cell provided in this embodiment, Fig.15 As shown, when welding the pole lug connection part 52 and the pole lug 31, and the pole post connection part 51 and the pole post 4, the battery cell 3 can be in a horizontal state. After welding is completed, when the core needs to be closed, the battery cell 3 is rotated and pushed upward at the same time. At this time, the pole lug connection part 52 moves in the direction close to the pole post connection part 51, and squeezes the telescopic structure 54, so that the telescopic structure 54 shrinks to the shortest length, and the battery cell 3 is continuously pushed upward until the pole lug connection part 52 and the pole lug 31 are integrally abutted against the bottom wall of the groove 21, and the end face of the battery cell 3 is abutted against the cover plate 2.

[0170] The other structures in this embodiment are similar to the corresponding structures in the first embodiment and have similar beneficial effects, and will not be described in detail in this embodiment.

[0171] Embodiment 3

[0172] The difference between the battery cell provided in this embodiment and that in the first embodiment lies in the different structure of the adapter.

[0173] Specifically, the rotation axis of the deformation part 53 when rotating around the pole lug connection part 52 is the first rotation axis, and the rotation axis of the deformation part 53 when rotating around the pole connection part 51 is the second rotation axis, and both the first rotation axis and the second rotation axis extend along the width direction of the cover plate 2. It should be noted that when the width of the cover plate 2 is narrow, when the adapter plate 5 is provided with the pole connection part 51, the pole lug connection part 52 and the deformation part 53 along the width direction of the cover plate 2 (i.e., the second direction Y), the space is limited, resulting in that the area of ​​the pole lug connection part 52 and the pole connection part 51 needs to be small, which increases the difficulty of operation. In this embodiment, the first rotating shaft and the second rotating shaft both extend along the second direction Y, so that the pole connection part 51, the deformation part 53 and the pole lug connection part 52 can be extended along the first direction X, so that the pole connection part 51 and the pole lug connection part 52 can be longer in the first direction X, and thus the pole connection part 51 and the pole lug connection part 52 can have a larger connection area, which is convenient for connecting the pole 4 with the pole connection part 51, and the pole lug 31 with the pole lug connection part 52. In addition, in the case where the battery cell includes two battery cells 3, it is not necessary to set two deformation parts 53 and two pole lug connection parts 52, so that the two battery cells 3 can share one deformation part 53, reducing the number of deformation parts 53, and thus reducing the cost of the adapter 5 and ensuring the structural strength of the adapter 5.

[0174] In this embodiment, if Fig.17 As shown, the battery cell 3 is provided with one, and the adapter plate 5 and the pole 4 are provided with two and connected correspondingly, as shown in FIG. Fig.18 As shown, each adapter plate 5 includes a tab connection portion 52. Fig.19 As shown, the two adapters 5 in this embodiment are centrally symmetrically arranged, the two poles 4 are also centrally symmetrically arranged, and the two pole tabs 31 of the battery cell 3 are also centrally symmetrically arranged, and the symmetry center and symmetry axis O of the three are the same. In addition, the pole tab connection portions 52 of the two adapters 5 are located on opposite sides of the two pole connection portions 51, that is, the pole tab connection portion 52 of one adapter 5 is located on the side of the pole connection portion 51 facing the other adapter 5.

[0175] For example, when only one battery cell 3 is provided, the tab 31 of the battery cell 3 is connected to any one of the two surfaces of the tab connecting portion 52 in the thickness direction.

[0176] In some embodiments, the tabs 31 of the battery cell 3 are connected to the surface of the tab connection portion 52 facing the cover plate 2 to reduce the occupancy of the accommodation space by the tabs 31 and reduce the redundancy of the tabs 31. Fig.18 As shown, the tab connection portion 52 has an arc surface 525 , and the tab 31 passes around the arc surface 525 and is connected to the surface of the tab connection portion 52 facing the cover plate 2 to prevent the edges of the tab connection portion 52 from scratching the tab 31 .

[0177] In some possible implementations, such as Fig.21 As shown, a protrusion 22 is provided on the outer surface of the cover plate 2 at a position corresponding to the groove 21. The minimum distance between the edge of the protrusion 22 and the housing 1 in the width direction of the cover plate 2 (i.e., the second direction Y) is a third distance d3. The tab 31 includes an inclined portion 311 and a straight portion 312, the inclined portion 311 is led out from the battery cell 3, the straight portion 312 is connected to the tab connection portion 52, and the minimum distance between the straight portion 312 and the side wall of the battery cell 3 is a fourth distance d4.

[0178] Since the electrode tab 31 is accommodated by the groove 21 in this embodiment, on the basis that the electrode tab 31 is connected to the surface of the electrode tab connection portion 52 facing the cover plate 2, in order to enter the groove 21, the electrode tab 31 bypasses the turning portion of the arc surface 525 and needs to move toward the middle of the battery cell 3 in the second direction Y, while the position of the electrode tab 31 coming out of the battery cell 3 remains unchanged. Fig.21 As shown, the length of the first inclined edge 3111 of the inclined portion 311 increases, and the length of the second inclined edge 3112 decreases, so it is necessary to increase the distance between the straight portion 312 and the side wall of the battery cell 3 (i.e., the fourth distance d4), because the increase of the fourth distance d4 will make the first inclined edge 3111 longer and the second inclined edge 3112 shorter. Therefore, the minimum distance between the edge of the protrusion 22 and the shell 1 in the width direction of the cover plate 2 (i.e., the second direction Y) (i.e., the third distance d3) is related to the minimum distance between the straight portion 312 and the side wall of the battery cell 3 (i.e., the fourth distance d4), and the relationship is positively correlated.

[0179] Exemplarily, the third distance d3 and the fourth distance d4 satisfy: 0.8d3≤d4≤2.5d3; 1mm≤d3≤10mm. In some embodiments, d3≤d4≤2d3; 2mm≤d3≤8mm. For example, the value of d3 is 2mm, 4mm, 6mm, 8mm.

[0180] In accordance with the above, if it is necessary to increase or decrease the length of the first inclined edge 3111 and the second inclined edge 3112 at the same time, Fig.21 On the basis of, the battery cell 3 can be moved to the left or right as a whole.

[0181] In this embodiment, after the battery cell 3 is loaded into the shell 1, it needs to be centered in the shell 1, and the cover plate 2 needs to fit tightly into the opening of the shell 1. Based on this, along the length direction of the cover plate 2, the central axis of the cover plate 2 and the center of the battery cell 3 should be almost collinear. However, the battery cell 3 will shift as the adapter 5 rotates. Therefore, in order to ensure the final position of the battery cell 3, in this embodiment, when the battery cell 3 and the cover plate 2 are connected (that is, when the pole connecting portion 51 of the adapter 5 and the pole 4 are welded), the battery cell 3 is offset relative to the cover plate 2 to compensate for the difference in offset after the adapter 5 is rotated (such as Fig. 20The eighth distance d9 in the figure). The offset is between 0.5 mm and 20 mm, preferably between 2 mm and 10 mm. The offset can compensate for the amount of the tab 31 shifting to the left after the deformed portion 53 of the adapter 5 becomes straight after the battery cell 3 is closed, thereby preventing the tab 31 from being torn due to force after the battery cell 3 is closed, thereby ensuring the current carrying capacity of the tab 31.

[0182] The other structures in this embodiment are similar to the corresponding structures in the first embodiment and have similar beneficial effects, and will not be described in detail in this embodiment.

[0183] Embodiment 4

[0184] The battery cell provided in this embodiment is different from that in the third embodiment in that the relative positions of the tab connection portion and the pole connection portion are different.

[0185] Specifically, in this embodiment, Fig. 22 and Fig.23 As shown, two poles 4 are provided, and two adapter plates 5 are provided. Each pole 4 is connected to a corresponding adapter plate 5 , and each pole 4 is connected to the pole connecting portion 51 of the corresponding adapter plate 5 .

[0186] Each adapter plate 5 includes a tab connection portion 52 and a pole connection portion 51. The two tab connections 52 are connected to the same side of the two pole connection portions 51 in the length direction of the cover plate 2 (i.e., the first direction X), so that during the assembly process, the two tabs 31 have the same offset direction, which greatly reduces the risk of the tabs 31 being torn. The two tab connections 52 are connected to the same side of the two pole connection portions 51 in the length direction of the cover plate 2 (i.e., the first direction X), that is, the two tab connections 52 have the same orientation.

[0187] It should be noted that the rotation axis of the deformation portion 53 when it rotates around the pole lug connection portion 52 is the first rotation axis. When the pole lug connection portion 52 rotates around the first rotation axis, the pole lug connection portion 52 will not only move in the height direction of the cover plate 2 (i.e., the third direction Z), but also in the length direction of the cover plate 2 (i.e., the first direction X). The pole lug connections 52 of the two adapter plates 5 have opposite offset directions. In this case, the pole lug 31 connected to the corresponding pole lug connection portion 52 will also be driven to offset in the opposite direction, causing the pole lug 31 to be torn due to stress, and the reliability is low. In this embodiment, the two pole lugs 31 have the same offset direction. Fig. 22 In the embodiment, the two tabs 31 are both offset to the left or to the right, which can avoid the problem of the tabs 31 being pulled and torn, and has higher reliability.

[0188] In this embodiment, the cover plate 2 is provided with a pole through hole (not shown in the figure), and the pole through hole is used to install the pole 4. In this embodiment, the welding position of the pole 4 and the pole connecting portion 51 is located below the pole through hole. In addition, since the orientation of the pole ear connecting portions 52 of the two adapter plates 5 is adjusted, the two adapter plates 5 in this embodiment are not centrally symmetrical, and thus the two poles 4 are not centrally symmetrical.

[0189] The other structures in this embodiment are similar to the corresponding structures in the third embodiment and have similar beneficial effects, and this embodiment will not be described in detail here.

[0190] Embodiment 5

[0191] The battery cell provided in this embodiment is different from that in the fourth embodiment in that the structure of the pole is different.

[0192] Specifically, in this embodiment, two poles are provided, two adapter plates are provided, each pole is connected to a corresponding adapter plate, and each pole is connected to a pole connecting portion of a corresponding adapter plate.

[0193] In this embodiment, one of the two poles includes a pole body and an extension portion that are connected to each other. The extension portion is connected to one end of the pole body close to the adapter plate and extends toward the other pole. The extension portion is connected to the corresponding pole connection portion, and the two poles are centrally symmetrically distributed along the center of the cover plate, and the symmetry axis is parallel to the width direction of the cover plate. In this way, the pole ear connection portions of the two adapter plates are oriented in the same direction, that is, the two pole ear connection portions are located on the same side of the two pole connection portions, and the symmetrical distribution of the two poles is achieved, which is convenient for connecting the bus.

[0194] It should be noted that when the two poles on the cover plate are not arranged in a center-symmetrical manner, the welding of the poles and the battery bus will be affected. In the present embodiment, an extension portion is formed by extending the bottom of one of the poles toward the direction close to the other pole. The extension portion is used to connect with the pole connecting portion, so that the pole through-hole of the cover plate and the projection of the welding area of ​​the pole and the pole connecting portion passing through the pole through-hole in the third direction do not overlap, thereby achieving the same orientation of the pole ear connecting portions of the two adapter plates and the center-symmetrical distribution of the two poles, which will not affect the welding of the pole and the bus.

[0195] On this basis, since part of the area of ​​the pole lug connection portion will overlap with the bottom of the pole in the thickness direction of the cover plate, it is necessary to extend the pole lug connection portion along the width direction of the cover plate to avoid the bottom of the pole, so that the pole lug is connected to the extended part of the pole lug connection portion, ensuring that the extended part of the pole lug connection portion and the pole lug can be completely received in the groove to improve the space utilization of the battery cell.

[0196] It should be noted that this embodiment can be applicable to battery cells with a longer length or to battery cells with a shorter length by providing an extension portion, and has a wider range of applications.

[0197] The other structures in this embodiment are similar to the corresponding structures in the fourth embodiment and have similar beneficial effects, and this embodiment will not be described in detail here.

[0198] Embodiment 6

[0199] The battery cell provided in this embodiment is different from that in the fourth embodiment in that the arrangement position of the pole is different.

[0200] Specifically, Fig.24 He Ru Fig.25 As shown, the pole lug connection parts 52 of the two adapter plates 5 in this embodiment are oriented in the same direction, that is, the two pole lug connection parts 52 are located on the same side of the two pole column connection parts 51 to avoid the problem of the pole lug 31 being torn. In addition, the two pole columns 4 in this embodiment are centrally symmetrically distributed along the center of the cover plate 2, and the symmetry axis O is parallel to the width direction of the cover plate 2 to facilitate the welding of the pole column 4 and the busbar and reduce the difficulty of assembly. However, the two sets of pole lugs 31 in this embodiment are asymmetrically distributed.

[0201] For example, Fig.24 As shown, there is a blank area at the right end of the cover plate 2 so that the two poles 4 can be distributed symmetrically in the center.

[0202] It should be noted that the structure provided in this embodiment is suitable for battery cells with a longer length, for example, a battery cell with a length greater than 200 mm. If the battery cell is shorter, the lengths of the battery cell 3 and the tab 31 in the first direction X are both shorter and cannot meet the overcurrent requirement.

[0203] The other structures in this embodiment are similar to the corresponding structures in the fourth embodiment and have similar beneficial effects, and this embodiment will not be described in detail here.

[0204] Embodiment 7

[0205] The battery cell provided in this embodiment is different from that in the third embodiment in the number of battery cells.

[0206] Specifically, in this embodiment, two battery cells are provided, and two adapter plates and two poles are provided respectively, and each adapter plate includes a pole connection portion and a pole lug connection portion. The two battery cells are arranged along the width direction of the cover plate (i.e., the second direction), and the pole lugs of the two battery cells are symmetrically welded to the two surfaces in the thickness direction of the pole lug connection portion.

[0207] The other structures in this embodiment are similar to the corresponding structures in the third embodiment and have similar beneficial effects, and this embodiment will not be described in detail here.

[0208] Embodiment 8

[0209] The difference between the battery cell provided in this embodiment and that in the first embodiment lies in the different structure of the adapter.

[0210] Specifically, Figures 26 to 34 As shown, two battery cells 3 are provided, and two adapter plates 5 and poles 4 are provided one by one, and each adapter plate 5 is electrically connected to the corresponding pole 4. Each adapter plate 5 includes a pole connecting portion 51 and a pole lug connecting portion 52, and the pole connecting portion 51 and the pole lug connecting portion 52 are connected through a deformation portion 53. It should be noted that, in this embodiment, the first rotation axis of the deformation portion 53 when rotating around the pole lug connecting portion 52 and the second rotation axis when rotating around the pole connecting portion 51 both extend along the second direction Y.

[0211] For example, Fig.28 As shown, the pole lug connection portion 52 includes a first connection structure 521, a first transition structure 522 and a second connection structure 523. Among them, the deformation portion 53 is connected between the first connection structure 521 and the pole connection portion 51, so that the deformation portion 53 can rotate relative to the first connection structure 521 and can rotate relative to the pole connection portion 51. The first transition structure 522 is connected between the first connection structure 521 and the second connection structure 523, so that there is a height difference between the first connection structure 521 and the second connection structure 523, and the second connection structure 523 is connected to the pole lug 31. It should be noted that the connection between the first connection structure 521 and the second connection structure 523 is a hard connection, that is, the connection between the first connection structure 521 and the second connection structure 523 is not rotatable. By setting the first connecting structure 521 and the second connecting structure 523, and there is a height difference between the first connecting structure 521 and the second connecting structure 523, the first connecting structure 521 and the second connecting structure 523 can be abutted between the cover plate 2 and the battery cell 3 to better support the battery cell 3, reduce the probability of the battery cell 3 jumping, and have higher stability.

[0212] It should also be noted that the height difference between the first connection structure 521 and the second connection structure 523 specifically refers to the distance between the first connection structure 521 and the second connection structure 523 in the third direction Z. More specifically, Fig.30 As shown, the height difference between the first connection structure 521 and the second connection structure 523 may be the distance between the top surface of the first connection structure 521 and the top surface of the second connection structure 523 in the third direction Z.

[0213] For example, Fig.30As shown, when the adapter 5 is in the assembled state, the height difference between the first connection structure 521 and the second connection structure 523 is the fifth distance d5. Among them, 0.5mm≤d5≤4mm. In some embodiments, 1mm≤d5≤3mm. The size of the fifth distance d5 is mainly related to the depth of the groove 21. For example, the fifth distance d5 is 0.5mm, 1mm, 1.5mm, 2mm, 2.5mm, 3mm, 3.5mm, 4mm, etc.

[0214] In some embodiments, when the adapter 5 is in an unassembled state, the pole connection portion 51 is located below the second connection structure 523, and the height difference between the pole connection portion 51 and the second connection structure 523 is the sixth distance d6. The size of the sixth distance d6 is mainly related to the minimum distance between the protrusion 22 on the cover plate 2 and the edge of the cover plate 2. In this embodiment, 1mm≤d6≤10mm. In some embodiments, 2mm≤d6≤5mm. For example, the sixth distance d6 is 1mm, 2mm, 3mm, 5mm, 6mm, 8mm, 9mm, 10mm, etc.

[0215] For example, Fig.31 As shown, when the adapter plate 5 is in the assembled state, the pole connecting portion 51 is substantially flush with the first connecting structure 521, and the second connecting structure 523 and the pole ear 31 are both located in the groove 21. At this time, the height difference between the pole connecting portion 51 and the second connecting structure 523 is reduced to be the same as the height difference between the first connecting structure 521 and the second connecting structure 523, and the height difference between the first connecting structure 521 and the second connecting structure 523 remains unchanged.

[0216] In this embodiment, Fig.33 In the embodiment, since the pole connecting portion 51 and the first connecting structure 521 are flush, that is, the pole connecting portion 51, the deforming portion 53 and the first connecting structure 521 are coplanar, the second connecting structure 523 has been pushed into the groove 21, and there is no need to continue pushing the adapter plate 5. Fig.33 In the direction shown, it only moves to the right and will not deflect back to the left, that is, the second connection structure 523 and the third connection structure 511 will only move as a whole in the direction away from the pole connection part 51, and will not move in the direction close to the pole connection part 51 after moving into place, so that the pole lug connection part 52 will only deviate in one direction, so the pole lug 31 will not be pulled left and right, reducing the risk of damage to the pole lug 31. In addition, the pole lug 31 can be better accommodated in the groove 21, and the space for accommodating the pole lug 31 can be increased. Although the pole connection part 51 and the second connection structure 523 are softly connected through the deformation part 53, the deformation part 53 is not soft without hardness, so after the battery cell is assembled, the pole connection part 51 can remain basically parallel to the second connection structure 523.

[0217] When assembling a battery cell, in fact, as long as the second connection structure 523 of the pole lug connection part 52 stops pushing the adapter plate 5 before the back-deflection occurs, and ensure that the second connection structure 523 of the pole lug connection part 52 has been pushed into the groove 21 at this time. When the pole connection part 51 and the first connection structure 521 are basically parallel, it is a relatively extreme situation. As long as the first connection structure 521 is continued to be pushed so that the first connection structure 521 is higher than the pole connection part 51, the back-deflection occurs. In other words, as long as the first connection structure 521 is lower than or flush with the pole connection part 51, and the second connection structure 523 enters the groove 21, the assembly of the battery cell can be achieved. Therefore, in this embodiment, the shell 1 ensures the depth of the second connection structure 523 into the groove 21 by setting the height difference between the second connection structure 523 and the first connection structure 521.

[0218] If the first connection structure 521 is lower than the pole connection part 51 in the final form after the battery cell is assembled, the first connection structure 521 can abut against the end face of the battery cell 3 to maintain stability. Alternatively, the pole connection part 51 and the first connection structure 521 can abut against the battery cell 3 together, that is, the pole connection part 51 and / or the first connection structure 521 abut against the end face of the battery cell 3. When the first connection structure 521 abuts against the end face of the battery cell 3, the second connection structure 523 can abut against the bottom wall of the groove 21. At this time, the second connection structure 523 abuts against the bottom wall of the groove 21 upwards, and the first connection structure 521 abuts against the end face of the battery cell 3 downwards. The first connection structure 521 and the second connection structure 523 are hard-connected, so the risk of the second connection structure 523 falling down due to the use conditions during the installation and use of the battery cell can be reduced, and the stability and reliability are high.

[0219] In some possible implementations, such as Fig.31 and Fig.32 As shown, the battery cell in this embodiment includes two battery cells 3, correspondingly, as shown in FIG. Fig.29 As shown, the pole tab connection portion 52 includes two second connection structures 523 and two first transition structures 522. The two second connection structures 523 are located on both sides of the first connection structure 521 in the width direction, that is, in the second direction Y, the two second connection structures 523 are located on both sides of the first connection structure 521. Each second connection structure 523 is connected to the first connection structure 521 through a first transition structure 522. The pole tabs 31 of the two battery cells 3 with the same polarity are correspondingly connected to the two second connection structures 523. By providing two second connection structures 523, it is convenient to connect the pole tabs 31 of the two battery cells 3 with the adapter 5. For example, the pole tabs 31 in this embodiment can be led out from the outer sides of the two battery cells 3 away from each other, so as to facilitate welding with the two second connection structures 523.

[0220] In some possible implementations, such as Fig.29 As shown, the second connection structure 523 in this embodiment is a structure extending away from the pole connection portion 51, that is, one end of the second connection structure 523 is connected to the first transition structure 522, and the other end of the second connection structure 523 is located on the side of the first connection structure 521 away from the pole connection portion 51.

[0221] In another possible implementation, if Figures 35 to 41 As shown, the second connection structure 523 is a structure extending toward the pole connection portion 51, that is, one end of the second connection structure 523 is connected to the first transition structure 522, and the other end of the second connection structure 523 is located on the side of the first connection structure 521 toward the pole connection portion 51, and is located on at least one side of the pole connection portion 51 in the second direction Y.

[0222] The above two types of adapter sheets 5 can both facilitate the assembly of battery cells and improve the space utilization of battery cells, and can be selected according to actual needs.

[0223] In some embodiments, the structures of the two adapter plates 5 in the battery cell may be the same or different, which is not limited in this embodiment. Fig. 27 As shown, the structures of the two adapter plates 5 of the battery cell in this embodiment are different, and one of the adapter plates 5 is Fig.29 The adapter 5 shown, another adapter 5 is Fig.36 The adapter 5 is shown.

[0224] In some embodiments, in order to ensure that the two poles 4 of the battery cell are centrally symmetrically arranged along the center of the cover plate 2, such as Fig. 27 and Fig.41 As shown, one of the two poles 4 includes a pole body 41 and an extension 42 connected to each other. The extension 42 is connected to one end of the pole body 41 close to the adapter 5 and extends toward the other pole 4, and the extension 42 is connected to the corresponding pole connection portion 51. In this way, the two poles 4 are centrally symmetrically distributed along the center of the cover plate 2, and the symmetry axis O is parallel to the width direction of the cover plate 2.

[0225] The other structures in this embodiment are similar to the corresponding structures in the first embodiment and have similar beneficial effects, and will not be described in detail in this embodiment.

[0226] Embodiment 9

[0227] The difference between the battery cell provided in this embodiment and that in the third embodiment lies in the different structure of the adapter.

[0228] Specifically, Figures 42 to 48As shown, two battery cells 3 are provided, and two adapter plates 5 and poles 4 are provided one by one, and each adapter plate 5 is electrically connected to the corresponding pole 4. Each adapter plate 5 includes a pole connecting portion 51 and a pole lug connecting portion 52, and the pole connecting portion 51 and the pole lug connecting portion 52 are connected by a deformation portion 53. It should be noted that, in this embodiment, the first rotation axis of the deformation portion 53 when rotating around the pole lug connecting portion 52 and the second rotation axis when rotating around the pole connecting portion 51 both extend along the first direction X.

[0229] For example, Fig.43 and Fig.44 As shown, the pole connection portion 51 includes a third connection structure 511, a fourth connection structure 512, and a second transition structure 513 connected between the third connection structure 511 and the fourth connection structure 512. There is a height difference between the third connection structure 511 and the fourth connection structure 512, and the connection between the third connection structure 511 and the fourth connection structure 512 is a hard connection, that is, the second transition structure 513 will not rotate around the third connection structure 511 and the fourth connection structure 512, and there is always a height difference between the third connection structure 511 and the fourth connection structure 512. The third connection structure 511 is connected to the pole 4, and the deformation portion 53 is connected between the fourth connection structure 512 and the pole lug connection portion 52, so that the connection between the fourth connection structure 512 and the pole lug connection portion 52 is a soft connection, and the deformation portion 53 can rotate relative to the fourth connection structure 512 and can also rotate relative to the pole lug connection portion 52. By setting the third connection structure 511 and the fourth connection structure 512 to have a height difference, the third connection structure 511 and the fourth connection structure 512 can be abutted between the cover plate 2 and the battery cell 3 to better support the battery cell 3, reduce the probability of the battery cell 3 jumping, and have higher stability.

[0230] It should be noted that the height difference between the third connection structure 511 and the fourth connection structure 512 specifically refers to the distance between the third connection structure 511 and the fourth connection structure 512 in the third direction Z. More specifically, Fig.45 As shown, the height difference between the third connection structure 511 and the fourth connection structure 512 may be the distance between the top surface of the third connection structure 511 and the top surface of the fourth connection structure 512 in the third direction Z.

[0231] For example, Fig.45As shown, when the adapter 5 is in the assembled state, the height difference between the third connection structure 511 and the fourth connection structure 512 is the seventh distance d7, 0.5mm≤d7≤4mm. In some embodiments, 1mm≤d7≤3mm. The size of the seventh distance d7 is mainly related to the depth of the groove 21. For example, the seventh distance d7 is 0.5mm, 1mm, 1.5mm, 2mm, 2.5mm, 3mm, 3.5mm, 4mm, etc.

[0232] In some possible implementations, such as Fig.43 and Fig.45 As shown, when the adapter 5 is in an unassembled state, the third connection structure 511 is located above the fourth connection structure 512, the pole ear connection portion 52 is located above the third connection structure 511, and the height difference between the pole ear connection portion 52 and the third connection structure 511 is the eighth distance d8. The size of the eighth distance d8 is mainly related to the minimum distance between the protrusion 22 on the cover plate 2 and the edge of the cover plate 2. In this embodiment, 1mm≤d8≤10mm. In some embodiments, 2mm≤d8≤5mm. For example, the eighth distance d8 is 1mm, 2mm, 3mm, 5mm, 6mm, 8mm, 9mm, 10mm, etc.

[0233] For example, Fig.47 As shown, when the adapter plate 5 is in the assembled state, the pole lug connection portion 52 is substantially flush with the fourth connection structure 512, and the pole lug connection portion 52, the pole lug 31, the fourth connection structure 512, the deformation portion 53 and the third connection structure 511 are all located in the groove 21. At this time, the height difference between the pole lug connection portion 52 and the third connection structure 511 is reduced to be the same as the height difference between the third connection structure 511 and the fourth connection structure 512, and the height difference between the third connection structure 511 and the fourth connection structure 512 remains unchanged.

[0234] Although the tab connection portion 52 and the fourth connection structure 512 are softly connected through the deformation portion 53 , the deformation portion 53 is not completely soft, so after the battery cell is assembled, the tab connection portion 52 can remain substantially parallel to the fourth connection structure 512 .

[0235] In some possible implementations, such as Fig.47 As shown, the tab connection portion 52 and the fourth connection structure 512 abut against the bottom wall of the groove 21 , and the third connection structure 511 can abut against the end surface of the battery cell 3 to achieve positioning of the battery cell 3 .

[0236] The battery cell in this embodiment includes two battery cells 3, and correspondingly, the adapter plate 5 includes two correspondingly connected deformation portions 53 and two tab connection portions 52. Fig.44As shown, the two deformation portions 53 are connected to both sides of the fourth connection structure 512 in the width direction thereof, that is, the two deformation portions 53 are connected to both sides of the fourth connection structure 512 in the second direction Y, so that the two pole ear connection portions 52 can extend back to the fourth connection structure 512 in the second direction Y, thereby facilitating welding with the pole ear 31.

[0237] During the assembly of the battery cell provided in this embodiment, since the connection between the third connection structure 511 and the fourth connection structure 512 is a hard connection, and the connection between the fourth connection structure 512 and the pole ear connection portion 52 is a soft connection, the direction close to the cover plate 2 is the upper direction, and the direction away from the cover plate 2 is the lower direction, when the adapter sheet 5 is bent, as shown in FIG. Fig.47 As shown, the fourth connection structure 512 is located above the third connection structure 511 and in the groove 21, and the pole ear connection portion 52 is located below the third connection structure 511; after the adapter sheet 5 is bent, the fourth connection structure 512 and the pole ear connection portion 52 are flush and are jointly located in the groove 21. During the entire movement of the battery cell 3 and the pole ear connection portion 52, the pole ear connection portion 52 moves relative to the fourth connection structure 512 in a direction away from the fourth connection structure 512 and then stops, that is, the pole ear connection portion 52 moves to be flush with the fourth connection structure 512. At this time, the deformation portion 53, the pole ear connection portion 52 and the fourth connection structure 512 are coplanar, and the pole ear connection portion 52 will no longer deflect back in the direction close to the fourth connection structure 512. Therefore, the pole ear 31 will not be pulled left and right, thereby reducing the probability of damage to the pole ear 31 during assembly.

[0238] The other structures in this embodiment are similar to the corresponding structures in the third embodiment and have similar beneficial effects, and this embodiment will not be described in detail here.

[0239] In a second aspect, a battery cell assembly method is provided, which is used to assemble a battery cell in any embodiment of the first aspect. The battery cell assembly method provided in this embodiment is easy to operate, has high assembly efficiency, and the assembled battery cell has a high space utilization rate.

[0240] The battery cell assembly method includes the following steps:

[0241] S1, adjusting the adapter 5 to be in a state of assembling the pole lug 31, adjusting the battery cell 3 to be in a horizontal state, and connecting the pole lug 31 of the battery cell 3 with the pole lug connecting portion 52;

[0242] S2, connecting the pole 4 and the pole connecting portion 51;

[0243] S3, controlling the battery cell 3 to switch from the horizontal state to the vertical state, and at the same time, pushing the tab connection portion 52 to move toward the cover plate 2 through the battery cell 3, so as to drive the deformation portion 53 to rotate relative to the pole connection portion 51 and the tab connection portion 52;

[0244] S4, placing the battery cell 3 into the housing 1, and connecting the housing 1 and the cover plate 2.

[0245] In step S1, the battery cell 3 is in a horizontal position (eg Figure 4 Specifically, the axis of the battery cell 3 is parallel to the cover plate 2. The tab 31 and the tab connection portion 52 can be connected by welding to have a higher connection strength.

[0246] In step S2 , the pole 4 and the pole connecting portion 51 may be connected by welding or the like.

[0247] In step S3, the battery cell 3 can be changed from a horizontal state to a vertical state by controlling the rotation of the battery cell 3. The vertical state of the battery cell 3 is a state in which the axis of the battery cell 3 is perpendicular to the cover plate 2. The tab connection portion 52 moves toward the direction close to the cover plate 2 so as to enter the groove 21, so that the entire adapter plate 5 and the tab 31 can be accommodated in the groove 21, thereby improving the space utilization of the battery cell.

[0248] Between steps S1 and S2, step S1.5 may be further included: installing the pole 4 on the cover plate 2. In some embodiments, the pole 4 may be fixed on the cover plate 2 in advance, that is, the pole 4 and the cover plate 2 are already connected as a whole when the materials are received. In some embodiments, a sealing structure may be provided between the pole 4 and the cover plate 2 for sealing.

[0249] It should be noted that the sequence of step S1 and step S2 can be adjusted as needed, or can be performed simultaneously, which is not limited in this embodiment.

[0250] The battery cell assembly method provided in this embodiment does not require the addition of additional processes or the use of additional devices. The tab connection portion 52 can be driven to rotate by utilizing the movement of the battery cell 3 during the cell assembly process, thereby improving assembly efficiency.

[0251] In a third aspect, the present embodiment provides a battery, including the battery cell in the first aspect; or, an electrical device includes a battery cell assembled according to the battery cell assembly method in the second aspect. The battery provided by the present embodiment can have a higher space utilization rate and thus a larger capacity.

[0252] In a fourth aspect, the present embodiment provides an electric device, comprising the battery cell in the first aspect; or, the electric device comprises a battery cell assembled according to the battery cell assembly method in the second aspect; or, the electric device comprises the battery in the third aspect. The electric device provided by the present embodiment can have a high space utilization rate.

[0253] Exemplarily, electrical devices include, but are not limited to: mobile phones, portable devices, laptop computers, electric vehicles, electric vehicles, ships, spacecraft, electric toys and electric tools, etc. For example, spacecraft include airplanes, rockets, space shuttles and spacecraft, etc. Electric toys include fixed or mobile electric toys, such as game consoles, electric vehicle toys, electric ship toys and electric airplane toys, etc. Electric tools include metal cutting power tools, grinding power tools, assembly power tools and railway power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators and electric planers.

[0254] Note that the above are only preferred embodiments of the present invention and the technical principles used. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and that various obvious changes, readjustments and substitutions can be made by those skilled in the art without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in more detail through the above embodiments, the present invention is not limited to the above embodiments, and may include more other equivalent embodiments without departing from the concept of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

Claims

1. A battery cell, comprising a housing (1), a cover plate (2), a battery cell (3), and a pole (4) mounted on the cover plate (2), wherein the cover plate (2) is connected to an end of the housing (1) and cooperates with the housing (1) to form a receiving space, and the battery cell (3) is placed in the receiving space, characterized in that: The battery cell further comprises: A transfer plate (5), comprising a pole connecting portion (51), a pole lug connecting portion (52), and a deformation portion (53) connected to the pole connecting portion (51) and the pole lug connecting portion (52), wherein the deformation portion (53) can rotate around the pole lug connecting portion (52) and can rotate around the pole connecting portion (51), the pole lug connecting portion (52) is connected to the pole lug (31) of the battery cell (3), and the pole connecting portion (51) is connected to the pole (4); The inner surface of the cover plate (2) is provided with a groove (21), and at least a portion of the adapter plate (5) is located in the groove (21).

2. The battery cell according to claim 1, characterized in that: A first rotation angle α is formed between the deformation portion (53) and the pole connecting portion (51), and a second rotation angle β is formed between the deformation portion (53) and the pole lug connecting portion (52); a difference T between the first rotation angle α and the second rotation angle β satisfies: -20°≤T≤20°; Preferably, T=0; Preferably, the first rotation angle α is equal to the second rotation angle β, and 90°≤α≤170°.

3. The battery cell according to claim 1, characterized in that: The rotation axis of the deformation part (53) when rotating around the pole lug connecting part (52) is the first rotation axis, and the rotation axis of the deformation part (53) when rotating around the pole connecting part (51) is the second rotation axis, and both the first rotation axis and the second rotation axis extend along the length direction of the cover plate (2).

4. The battery cell according to claim 3, characterized in that: The height difference between the pole connecting portion (51) and the pole tab connecting portion (52) in the thickness direction of the cover plate (2) is a first distance d1, and in the width direction of the cover plate (2), the distance between the outer edge of the pole tab connecting portion (52) and the outer edge of the cover plate (2) is a second distance d2; 0.1d2≤d1≤1.2d2; and / or, 3mm≤d2≤15mm; and / or, 0.3mm≤d1≤18mm.

5. The battery cell according to any one of claims 1 to 4, characterized in that: The deformation portion (53) is a rigid structure; or, the deformation portion (53) is a flexible structure.

6. The battery cell according to any one of claims 1 to 4, characterized in that: The deformation portion (53) is a flexible structure, and the deformation portion (53) is a telescopic structure (54), one end of the telescopic structure (54) in the telescopic direction is connected to the pole connecting portion (51), and the other end is connected to the pole lug connecting portion (52).

7. The battery cell according to claim 6, characterized in that: The telescopic structure (54) comprises a plurality of telescopic layers (541) stacked together, wherein the telescopic layers (541) are bent to form a plurality of folds (5411) arranged along the telescopic direction; and / or, in the telescopic direction of the telescopic structure (54), the minimum length of the telescopic structure (54) is L1, and the maximum length is L2, where L2=(1.1-1.5)L1; wherein 1.8 mm≤L1≤17 mm.

8. The battery cell according to any one of claims 1 to 4, characterized in that: The pole lug (31) is connected to the surface of the pole lug connecting portion (52) facing the cover plate (2); and / or, A protrusion (22) is provided on the outer surface of the cover plate (2) at a position corresponding to the groove (21), and the pole (4) is arranged on the protrusion (22); and / or, The surface of the pole connecting portion (51) facing away from the cover plate (2) is located in the groove (21).

9. The battery cell according to any one of claims 1 to 4, characterized in that: The thickness of the deformation portion (53) is smaller than the thickness of the pole lug connection portion (52) and smaller than the thickness of the pole connection portion (51); Alternatively, the deformation portion (53) is provided with a weak area (531), and the deformation portion (53) rotates relative to the pole lug connection portion (52) and the pole column connection portion (51) via the weak area (531); Alternatively, the deformation portion (53) includes a plurality of deformation sheets (532) stacked in layers.

10. The battery cell according to any one of claims 1 to 4, characterized in that: The adapter plate (5) comprises two pole lug connection portions (52), the two pole lug connection portions (52) being located on both sides of the pole column connection portion (51) in the width direction of the cover plate (2), and the deformation portion (53) being connected between each pole lug connection portion (52) and the pole column connection portion (51).

11. The battery cell according to claim 1 or 2, characterized in that: The rotation axis of the deformation portion (53) when rotating around the pole lug connection portion (52) is the first rotation axis, and the rotation axis of the deformation portion (53) when rotating around the pole connection portion (51) is the second rotation axis, and both the first rotation axis and the second rotation axis extend along the width direction of the cover plate (2).

12. The battery cell according to claim 11, characterized in that: A protrusion (22) is provided on the outer surface of the cover plate (2) at a position corresponding to the groove (21); the minimum distance between the edge of the protrusion (22) and the shell (1) in the width direction of the cover plate (2) is a third distance d3; the pole ear (31) comprises an inclined portion (311) and a straight portion (312); the inclined portion (311) is led out from the battery cell (3); the straight portion (312) is connected to the pole ear connecting portion (52); the minimum distance between the straight portion (312) and the side wall of the battery cell (3) is a fourth distance d4, 0.8d3≤d4≤2.5d3; 1mm≤d3≤10mm; Preferably, the adapter sheet (5) comprises one pole lug connection portion (52); when the battery cell (3) is provided with one, the pole lug (31) of the battery cell (3) is connected to any one of the two surfaces in the thickness direction of the pole lug connection portion (52); when the battery cell (3) is provided with two, the two battery cells (3) are arranged along the width direction of the cover plate (2), and the pole lugs (31) of the two battery cells (3) are symmetrically welded to the two surfaces in the thickness direction of the pole lug connection portion (52); Preferably, two poles (4) are provided, and two adapter plates (5) are provided, each pole (4) corresponds to one adapter plate (5), and each pole (4) is connected to the pole connecting portion (51) of the corresponding adapter plate (5); each adapter plate (5) includes one pole ear connecting portion (52), and the two pole ear connecting portions (52) are connected to the same side of the two pole connecting portions (51) in the length direction of the cover plate (2).

13. The battery cell according to claim 12, characterized in that: One of the poles (4) comprises a pole body (41) and an extension portion (42) connected to each other, the extension portion (42) being connected to one end of the pole body (41) close to the adapter plate (5) and extending toward the other pole (4), and the extension portion (42) being connected to the corresponding pole connecting portion (51); The two poles (4) are centrally symmetrically distributed along the center of the cover plate (2), and the symmetry axes (O) of the two poles (4) are parallel to the width direction of the cover plate (2).

14. The battery cell according to claim 11, characterized in that: The pole lug connection portion (52) comprises a first connection structure (521), a first transition structure (522) and a second connection structure (523); the deformation portion (53) is connected between the first connection structure (521) and the pole column connection portion (51); the first transition structure (522) is connected between the first connection structure (521) and the second connection structure (523); there is a height difference between the first connection structure (521) and the second connection structure (523); and the second connection structure (523) is connected to the pole lug (31).

15. The battery cell according to claim 14, characterized in that: The height difference between the first connection structure (521) and the second connection structure (523) is a fifth distance d5, 0.5 mm ≤ d5 ≤ 4 mm; and / or, The pole connection portion (51) and / or the first connection structure (521) abut against the end surface of the battery cell (3), and the second connection structure (523) abuts against the bottom wall of the groove (21).

16. The battery cell according to claim 14, characterized in that: The tab connection portion (52) comprises two second connection structures (523) and two first transition structures (522), the two second connection structures (523) being located on both sides of the first connection structure (521) in a width direction, and both being connected to the first connection structure (521) via one first transition structure (522); and / or, One end of the second connection structure (523) is connected to the first transition structure (522), and the other end of the second connection structure (523) is located on a side of the first connection structure (521) facing away from the pole connection portion (51); or, one end of the second connection structure (523) is connected to the first transition structure (522), and the other end of the second connection structure (523) is located on a side of the first connection structure (521) facing the pole connection portion (51).

17. The battery cell according to claim 3, characterized in that: The pole connecting portion (51) comprises a third connecting structure (511), a fourth connecting structure (512) and a second transition structure (513) connected between the third connecting structure (511) and the fourth connecting structure (512); there is a height difference between the third connecting structure (511) and the fourth connecting structure (512); the third connecting structure (511) is connected to the pole (4); and the deformation portion (53) is connected between the fourth connecting structure (512) and the pole lug connecting portion (52).

18. The battery cell according to claim 17, characterized in that: The fourth connection structure (512) and the pole lug connection portion (52) are both located in the groove (21), and the pole lug connection portion (52) abuts against the bottom wall of the groove (21); the height difference between the third connection structure (511) and the fourth connection structure (512) is a seventh distance d7, 0.5 mm≤d7≤4 mm; and / or, The adapter plate (5) comprises two correspondingly connected deformation portions (53) and two pole lug connection portions (52), and the two deformation portions (53) are connected to two sides of the fourth connection structure (512) in its width direction.

19. A method for assembling a battery cell, for assembling a battery cell according to any one of claims 1 to 18, characterized in that: The battery cell assembly method comprises the following steps: The adapter (5) is adjusted to be in a state of assembling the pole lug (31), the battery cell (3) is adjusted to be in a horizontal state, and the pole lug (31) of the battery cell (3) is connected to the pole lug connecting portion (52); Connecting the pole (4) and the pole connecting portion (51); Controlling the battery cell (3) to switch from the horizontal state to the vertical state, and at the same time, pushing the pole lug connection portion (52) to move in a direction close to the cover plate (2) through the battery cell (3), so as to drive the deformation portion (53) to rotate relative to the pole column connection portion (51) and the pole lug connection portion (52); The battery core (3) is placed in the shell (1), and the shell (1) and the cover plate (2) are connected.

20. A battery, characterized in that The battery comprises a battery cell as claimed in any one of claims 1 to 18; or, the battery comprises the battery cell assembled by the battery cell assembly method according to claim 19.

21. An electrical device, characterized in that: The method comprises the battery cell according to any one of claims 1 to 18; or, the electrical device comprises the battery cell assembled by the battery cell assembly method according to claim 19; or, the electrical device comprises the battery according to claim 20.

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