Battery monomer, battery and electric device

Abstract

The utility model belongs to the technical field of batteries, and discloses a battery monomer, 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 connecting sheet. The connecting 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; a groove is formed in the inner surface of the cover plate, and at least part of the connecting piece is located in the groove. The battery monomer, the battery and the electric device provided by the utility model have relatively low assembly difficulty and relatively high space utilization rate.

Description

TECHNICAL FIELD

[0001] The utility model relates to battery technology field especially relates to a battery monomer, battery and electric device. BACKGROUND

[0002] The battery monomer usually includes the casing, the cover plate subassembly and the electric core, the cover plate subassembly installs at the opening of the casing, and is formed with the casing cooperation installation space, the electric core is installed in the installation space, the tab of the electric core is electrically connected with the cover plate subassembly, to be used for the input or output of electric energy.

[0003] In prior art, the cover plate subassembly includes the cover plate, the pole post installed on the cover plate and the connecting sheet connected with the pole post, the tab of the electric core is connected with the connecting sheet to be connected with the pole post through the connecting sheet. The connecting sheet in prior art usually includes the pole post connecting portion and the two tab connecting portions connected at both ends of the pole post connecting portion. The pole post connecting portion is used for connecting with the pole post, and the tab connecting portion is used for connecting with the tab. When assembling the battery monomer, the tab is usually connected with the tab connecting portion first, and then the pole post connecting portion is connected with the pole post after the tabs of the two electric cores are connected with the tab connecting portion respectively, and the connection between the pole post and the pole post connecting portion is usually welding on the side of the pole post connecting portion. In order to improve the utilization rate of the battery height space, the length of the tab is usually designed to be short, and when welding the pole post and the pole post connecting portion, the two electric cores are in the state of being perpendicular to the cover plate or being at a small angle with the cover plate, which causes the electric core to shield the pole post connecting portion, and further interferes with the welding of the pole post and the pole post connecting portion, increases the connection difficulty of the pole post and the pole post connecting portion, and further causes the assembly efficiency of the battery monomer to be low. UTILITY MODEL CONTENTS

[0004] The utility model aims at providing a battery monomer, battery and electric device, which has low assembly difficulty and high space utilization rate.

[0005] According to the above idea, the technical scheme adopted by the utility model is as follows:

[0006] The battery monomer includes a casing, a cover plate, an electric core and a pole post, the cover plate is connected to the casing and forms a containing space with the casing, the electric core is placed in the containing space, the pole post is installed on the cover plate, and the battery monomer further includes:

[0007] The connecting sheet includes a pole post connecting portion, a tab connecting portion and a deformation portion, the deformation portion is connected between the pole post connecting portion and the tab connecting portion, the deformation portion can rotate around the tab connecting portion and can rotate around the pole post connecting portion, the tab connecting portion is connected to the tab of the electric core, and the pole post connecting portion is connected to the pole post; the surface of the cover plate facing the electric core is provided with a groove, and at least part of the connecting sheet is located in the groove;

[0008] An insulating structure, at least part of which is arranged in the groove and used for insulation between the cover plate and the battery cell.

[0009] A first angle a is formed between the deformation part and the pole post connecting part, and a second angle β is formed between the deformation part and the tab connecting part; a difference T between the first angle a and the second angle β satisfies: -20°≤T≤20°.

[0010] A first angle a is formed between the deformation part and the pole post connecting part, and a second angle β is formed between the deformation part and the tab connecting part; a difference T between the first angle a and the second angle β satisfies: T=0.

[0011] A first angle a is formed between the deformation part and the pole post connecting part, and a second angle β is formed between the deformation part and the tab connecting part; the first angle a is equal to the second angle β, and 90°≤a≤170°.

[0012] In some embodiments, a first rotation axis is formed when the deformation part rotates around the tab connecting part, and a second rotation axis is formed when the deformation part rotates around the pole post connecting part; both the first rotation axis and the second rotation axis extend along the length direction of the cover plate.

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

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

[0015] In some embodiments, the deformation part is a rigid structure, or the deformation part is a flexible structure.

[0016] In some embodiments, the deformation part is a telescopic structure, one end of which is connected to the pole post connecting part and the other end of which is connected to the tab connecting part in the telescopic direction.

[0017] In some embodiments, the telescopic structure includes a plurality of telescopic layers arranged in layers, and the telescopic layers are bent to form a plurality of folds arranged in the telescopic direction.

[0018] In some embodiments, in the telescopic direction of the telescopic structure, the minimum length of the telescopic structure is L1, and the maximum length of the telescopic structure is L2, and L2=(1.1-1.5)L1; wherein, 1.8mm≤L1≤17mm.

[0019] In some embodiments, the tab is connected to the surface of the cover plate in the direction of the tab connecting portion; and / or,

[0020] The outer surface of the cover plate is provided with a protrusion corresponding to the position of the recess, and the pole post is arranged in the protrusion; and / or,

[0021] The surface of the pole post connecting portion away from the surface of the cover plate is located in the recess.

[0022] In some embodiments, the thickness of the deformation portion is less than the thickness of the tab connecting portion and the thickness of the pole post connecting portion; or, the deformation portion is provided with a weak area, and the deformation portion rotates relative to the tab connecting portion and the pole post connecting portion through the weak area; or, the deformation portion includes a plurality of deformation pieces arranged in layers.

[0023] In some embodiments, the connecting piece includes two tab connecting portions, and the two tab connecting portions are located on both sides of the pole post connecting portion in the width direction of the cover plate, and the deformation portion is connected between each of the tab connecting portions and the pole post connecting portion.

[0024] In some embodiments, the rotation axis of the deformation portion when rotating around the tab connecting portion is a first rotation axis, and the rotation axis of the deformation portion when rotating around the pole post connecting portion is a second rotation axis, and the first rotation axis and the second rotation axis both extend in the width direction of the cover plate.

[0025] In some embodiments, the outer surface of the cover plate is provided with a protrusion corresponding to the position of the recess, 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, the tab includes an inclined portion and a flat portion, the inclined portion is led out from the battery cell, the flat portion is connected with the tab connecting portion, and the minimum distance between the flat portion and the battery cell side wall is a fourth distance d4, 0.8d3≤d4≤2.5d3; 1mm≤d3≤10mm.

[0026] In some embodiments, the connecting piece includes one tab connecting portion;

[0027] The battery cell is provided with one, and the tab of one battery cell is connected to any one of the two surfaces in the thickness direction of the tab connecting portion; or,

[0028] The battery cell is provided with two, and the two battery cells are arranged in the width direction of the cover plate, and the tabs of the two battery cells are symmetrically welded to the two surfaces in the thickness direction of the tab connecting portion.

[0029] In some embodiments, two of the pole posts are provided, and two of the connecting pieces are provided, each of the connecting pieces corresponding to one of the pole posts, and each of the pole posts is connected to the pole post connecting portion of the corresponding connecting piece.

[0030] Each of the connecting pieces comprises one of the tab connecting portions, and the two tab connecting portions are connected to the same side of the pole post connecting portions in the length direction of the cover plate.

[0031] In some embodiments, one of the pole posts comprises a pole post body and an extension portion connected to one end of the pole post body close to the connecting piece, and extending towards the other pole post, and the extension portion is connected to the pole post connecting portion of the corresponding connecting piece.

[0032] The two pole posts are centrally symmetrically distributed along the center of the cover plate, and the symmetry axis of the two pole posts is parallel to the width direction of the cover plate.

[0033] In some embodiments, the tab connecting portion comprises a first connecting structure, a first transition structure, and a second connecting structure, the deformation portion is connected between the first connecting structure and the pole post connecting portion, the first transition structure is connected between the first connecting structure and the second connecting structure, there is a height difference between the first connecting structure and the second connecting structure, and the second connecting structure is connected to the tab.

[0034] In some embodiments, the height difference between the first connecting structure and the second connecting structure is a fifth distance d5, and 0.5mm≤d5≤4mm.

[0035] In some embodiments, the pole post connecting portion and / or the first connecting structure abuts against the end surface of the battery cell, and the second connecting structure abuts against the groove bottom wall.

[0036] In some embodiments, the tab connecting portion comprises two second connecting structures and two first transition structures, the two second connecting structures are located on both sides of the first connecting structure in the width direction, and are connected to the first connecting structure through one of the first transition structures.

[0037] In some embodiments, one end of the second connecting structure is connected to the first transition structure, and the other end of the second connecting structure is located on the side of the first connecting structure away from the pole post connecting portion; or, one end of the second connecting structure is connected to the first transition structure, and the other end of the second connecting structure is located on the side of the first connecting structure towards the pole post connecting portion.

[0038] In some embodiments, the pole post 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, the third connecting structure and the fourth connecting structure have a height difference therebetween, the third connecting structure is connected to the pole post, and the deformation portion is connected between the fourth connecting structure and the tab connecting portion.

[0039] In some embodiments, the fourth connecting structure and the tab connecting portion are both located in the groove, and the tab connecting portion abuts against a groove bottom wall of the groove.

[0040] In some embodiments, the height difference between the third connecting structure and the fourth connecting structure is a seventh distance d7, 0.5mm≤d7≤4mm.

[0041] In some embodiments, the connecting piece includes two deformation portions and two tab connecting portions corresponding to the two deformation portions, and the two deformation portions are connected to two sides of the fourth connecting structure in a width direction thereof.

[0042] The battery monomer, the battery, and the electric device provided by the utility model have at least the following beneficial effects:

[0043] The connecting piece includes a pole post connecting portion, a tab connecting portion, and a deformation portion, the deformation portion can rotate around the tab connecting portion and the pole post connecting portion, the relative position of the tab connecting portion and the pole post connecting portion can be adjusted, when the pole post connecting portion and the pole post are welded, the electric core can be in a horizontal state, that is, the electric core can be in a state parallel to the cover plate, so that the electric core does not shield the pole post connecting portion and does not interfere with the welding of the pole post connecting portion and the pole post, the connection difficulty of the pole post connecting portion and the pole post is reduced, and the assembly difficulty of the battery monomer is reduced, the groove is arranged on the cover plate, at least part of the tab connecting portion can be located in the groove, the space utilization rate of the battery monomer is improved, and the battery monomer can have a higher capacity.

[0044] In addition, when the pole post and the pole post connecting portion are welded, the tab connecting portion and the pole post connecting portion are not welded in the same plane, thus, it is beneficial for the welding equipment to identify and position the welding areas of the two; and the welding quality problems, such as the generation of a welding explosion point in the welding area welded later, can be avoided due to the mutual influence of the two welding areas caused by being close to each other, and the battery monomer provided by the embodiment has high welding quality when welded. BRIEF DESCRIPTION OF DRAWINGS

[0045] In order to more clearly illustrate the technical scheme in the embodiments of the present application, the drawings needed to be used in the description of the embodiments of the present application will be briefly introduced as follows. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without any creative effort on the basis of the contents of the embodiments of the present application and the drawings.

[0046] Figure 1 is a structural schematic view of the battery monomer provided by the embodiment one of the present application;

[0047] Figure 2 is a sectional view of the battery monomer provided by the embodiment one of the present application;

[0048] Figure 3 is an enlarged view of A shown in the embodiment one of the present application; Figure 2

[0049] Figure 4 is an assembly schematic view of the battery monomer provided by the embodiment one of the present application;

[0050] Figure 5 is an enlarged view of B shown in the embodiment one of the present application; Figure 4

[0051] Figure 6 is a structural schematic view of the cover plate provided by the embodiment one of the present application;

[0052] Figure 7 is a first structural schematic view of the connecting piece provided by the embodiment one of the present application;

[0053] Figure 8 is a second structural schematic view of the connecting piece provided by the embodiment one of the present application;

[0054] Figure 9 is an exploded view of the connecting piece provided by the embodiment one of the present application;

[0055] Figure 10 is a sectional view of the battery monomer provided by the embodiment two of the present application;

[0056] Figure 11 is an enlarged view of E shown in the embodiment two of the present application; Figure 10

[0057] Figure 12 is a first structural schematic view of the connecting piece provided by the embodiment two of the present application;

[0058] Figure 13 is a different state diagram of the connecting piece provided by the embodiment two of the present application when assembling;

[0059] ​​​Figure 14 is another different state diagram of the connecting piece in the assembling of the embodiment two of the utility model;

[0060] Figure 15 is the assembling schematic view of the battery monomer provided by the embodiment two of the utility model;

[0061] Figure 16 is the structural schematic view of the battery monomer provided by the embodiment three of the utility model;

[0062] Figure 17 is the exploded schematic view of the battery monomer provided by the embodiment three of the utility model;

[0063] Figure 18 is the first structural schematic view of the connecting piece provided by the embodiment three of the utility model;

[0064] Figure 19 is the sectional view of the battery monomer provided by the embodiment three of the utility model;

[0065] Figure 20 is the enlarged view schematic view of C provided by the utility model Figure 19

[0066] Figure 21 is the first partial enlarged view of the battery monomer provided by the embodiment three of the utility model;

[0067] Figure 22 is the structural schematic view of the battery monomer provided by the embodiment four of the utility model;

[0068] Figure 23 is the exploded view of the battery monomer provided by the embodiment four of the utility model;

[0069] Figure 24 is the structural schematic view of the battery monomer provided by the embodiment six of the utility model;

[0070] Figure 25 is the exploded view of the battery monomer provided by the embodiment six of the utility model;

[0071] Figure 26 is the structural schematic view of the battery monomer provided by the embodiment eight of the utility model;

[0072] Figure 27 is the structural schematic view of the battery monomer without showing the cover plate provided by the embodiment eight of the utility model;

[0073] Figure 28 is the first structural schematic view of the connecting piece provided by the embodiment eight of the utility model;

[0074] Figure 29 is the first plan view of the connecting piece provided by the embodiment eight of the utility model;​

[0075] Figure 30 is a first side view of the connecting piece provided in the eighth embodiment of the utility model;

[0076] Figure 31 is a first partial sectional view of the battery monomer provided in the eighth embodiment of the utility model;

[0077] Figure 32 is a second partial sectional view of the battery monomer provided in the eighth embodiment of the utility model;

[0078] Figure 33 is a third partial sectional view of the battery monomer provided in the eighth embodiment of the utility model;

[0079] Figure 34 is a first assembly schematic view of the battery monomer provided in the eighth embodiment of the utility model;

[0080] Figure 35 is a second structure schematic view of the connecting piece provided in the eighth embodiment of the utility model;

[0081] Figure 36 is a second plan view of the connecting piece provided in the eighth embodiment of the utility model;

[0082] Figure 37 is a second side view of the connecting piece provided in the eighth embodiment of the utility model;

[0083] Figure 38 is a schematic view when the pole connecting portion and the first connecting structure are flush provided in the eighth embodiment of the utility model;

[0084] Figure 39 is a fourth partial sectional view of the battery monomer provided in the eighth embodiment of the utility model;

[0085] Figure 40 is a fifth partial sectional view of the battery monomer provided in the eighth embodiment of the utility model;

[0086] Figure 41 is a second assembly schematic view of the battery monomer provided in the eighth embodiment of the utility model;

[0087] Figure 42 is a structure schematic view of the battery monomer without showing the cover plate provided in the ninth embodiment of the utility model;

[0088] Figure 43 is a structure schematic view of the connecting piece provided in the ninth embodiment of the utility model;

[0089] Figure 44 is a plan view of the connecting piece provided in the ninth embodiment of the utility model;

[0090] Figure 45 is a side view of the connecting piece provided in the ninth embodiment of the present application;

[0091] Figure 46 is a first partial cross-sectional view of the battery monomer provided in the ninth embodiment of the present application;

[0092] Figure 47 is a second partial cross-sectional view of the battery monomer provided in the ninth embodiment of the present application;

[0093] Figure 48 is an assembly schematic view of the battery monomer provided in the ninth embodiment of the present application.

[0094] In the figure:

[0095] 1, shell; 2, cover plate; 21, groove; 22, protrusion; 3, electric core; 31, tab; 311, inclined part; 3111, first inclined edge; 3112, second inclined edge; 312, flat part; 4, pole; 41, pole body; 42, extension; 5, connecting piece; 51, pole connecting part; 511, third connecting structure; 512, fourth connecting structure; 513, second transition structure; 514, first lap joint part; 52, tab connecting part; 521, first connecting structure; 522, first transition structure; 523, second connecting structure; 524, second lap joint part; 525, arc surface; 53, deformation part; 531, weak area; 532, deformation piece; 54, stretch structure; 541, stretch layer; 5411, wrinkle; 6, lower insulating piece; 61, protruding structure; 62, accommodating groove; X, first direction; Y, second direction; Z, third direction; O, symmetry axis. DETAILED DESCRIPTION

[0096] To make the technical problems solved by the utility model, the technical scheme adopted and the technical effects reached more clear, the technical scheme of the utility model is further illustrated below by combining with the drawings and through specific embodiments. It can be understood that the specific embodiments described here are merely used for explaining the utility model and not limiting the utility model. In addition, it needs to be explained that, for the convenience of description, only the parts related to the utility model are shown in the drawings and not all. It should be noted that: similar signs and letters represent similar items in the following drawings, therefore, once an item is defined in one drawing, it does not need to be further defined and explained in the subsequent drawings. In the description of the utility model, unless explicitly defined and limited, the terms "connected", "connected", "fixed" should be understood broadly, for example, it can be fixed connection, but also can be detachable connection, or integral; can be mechanical connection, but also can be electrical connection; can be directly connected, but also can be indirectly connected through the intermediate medium, can be the communication inside two elements or the interaction relationship of two elements. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0097] In the utility model, unless explicitly defined and limited, the first feature is "on" or "below" the second feature, which can include direct contact between the first and second features, or indirect contact between the first and second features through another feature between them. Moreover, the first feature "on", "above" and "above" the second feature includes the first feature directly above and obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "below" and "below" the second feature includes the first feature directly below and obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature. In the description of the embodiment, if not specially stated, "a plurality of" specifically refers to two or more than two. In the description of the embodiment, the terms "up", "down", "right", etc. orientation or position relationship is based on the orientation or position relationship shown in the drawing, only for the convenience of description and simplification of operation, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, therefore, it cannot be understood as a limitation on the utility model. In addition, the terms "first", "second" are only used to distinguish in the description and have no special meaning. It needs to be explained that when an element is referred to as "fixed to" or "provided on" another element, it can be directly on another element or there can be a middle element.

[0098] The inventor discovered that, to improve the overall space utilization of a battery, protrusions are typically provided on the outer surface of the cover plate, with corresponding grooves on the inner surface. These grooves accommodate connecting tabs and the tabs connected to the connecting tabs. However, in conventional welding methods (first, the battery cell tabs and the connecting tab connection parts are welded in a horizontal position, then the terminal connection parts of the connecting tabs and the terminals are welded, and finally the battery cell is changed from a horizontal to a vertical position for assembly), due to the short length of the tabs, the battery cell cannot be placed horizontally when welding the terminal connection parts and the terminals, causing the battery cell to block the terminal connection parts and thus interfering with the welding of the terminals. To solve the interference problem, the inventor attempted to increase the length of the tabs. However, the inventor found that after increasing the tab length, the grooves could not effectively accommodate the tabs, which contradicts the starting point of "improving the overall space utilization of the battery." Furthermore, increasing the tab length increases tab redundancy, leading to an increased risk of tab inversion and tab tearing. After in-depth research and extensive experimentation, the inventor of the utility model proposed a technical solution that balances high space utilization with low assembly difficulty.

[0099] The technical solution of this utility model will be further described below with reference to the accompanying drawings and specific embodiments.

[0100] Firstly, this embodiment provides a battery cell that exhibits high assembly efficiency and high space utilization. The battery cell provided in this embodiment includes multiple embodiments, which will be explained one by one below.

[0101] Example 1

[0102] like Figures 1 to 3 As shown, the battery cell provided in this embodiment includes a casing 1, a cover plate 2, a cell 3, terminals 4, and a connecting piece 5. For example... Figure 1 As shown, the battery cell is rectangular in shape. For ease of explanation, in this embodiment, the length direction of the battery cell is defined as the first direction X, the width direction as the second direction Y, and the height direction 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 housing 1 and the length direction of the cover plate 2 are both the first direction X, the width direction of the housing 1 and the width direction of the cover plate 2 are both the second direction Y, and the height direction of the housing 1, the height direction of the cell 3, the thickness direction of the cover plate 2, and the height direction of the terminal post 4 are all the third direction Z.

[0103] The electrode post 4 is installed on the cover plate 2, which is connected to the end of the housing 1, specifically to the open end of the housing 1, and cooperates with the housing 1 to form an accommodating space. The battery cell 3 is placed in the accommodating space, and the end of the battery cell 3 facing the cover plate 2 has a tab 31.

[0104] like Figure 3As shown, the connecting piece 5 is arranged on the side of the cover plate 2 facing the battery cell 3, and the connecting piece 5 comprises a pole connecting portion 51, a tab connecting portion 52, and a deformation portion 53 connected between the pole connecting portion 51 and the tab connecting portion 52. It should be noted that the tab connecting portion 52, the deformation portion 53, and the pole connecting portion 51 are electrically connected in sequence to realize the transmission of electric energy. The deformation portion 53 can rotate around the tab connecting portion 52 and can rotate around the pole connecting portion 51, so that the relative position of the tab connecting portion 52 and the pole connecting portion 51 can be changed. In this embodiment, the tab connecting portion 52 is connected to the tab 31 of the battery cell 3, and the pole connecting portion 51 is connected to the pole 4, so that the battery cell 3 is connected to the pole 4 through the tab 31 and the connecting piece 5, and the input and output of electric energy are realized.

[0105] As shown, the surface of the cover plate 2 facing the battery cell 3 is an inner surface, and Figure 3 and Figure 6 As shown, the inner surface of the cover plate 2 is provided with a groove 21, and at least part of the connecting piece 5 is located in the groove 21 to be accommodated through the groove 21, reducing the occupation of the connecting piece 5 to the accommodation space, so that the gap between the battery cell 3 and the cover plate 2 can be smaller, improving the space utilization of the battery monomer, so that the battery cell 3 in the battery monomer of the same size can be higher, and the capacity of the battery monomer is improved, so that the battery and the power consumption device using the battery monomer can have higher energy density.

[0106] When assembling the battery monomer provided in this embodiment, the tab 31 and the tab connecting portion 52 can be welded first. As shown, Figure 4 the battery cell 3 can be in a horizontal state, and welding is performed in a direction perpendicular to the tab connecting portion 52, and the welding position is located on one side of the battery cell 3, so that the battery cell 3 will not be damaged. Next, the pole connecting portion 51 and the pole 4 are welded, and at this time, since the tab connecting portion 52 can rotate relative to the deformation portion 53, the tab connecting portion 52 at this time can be located on the side away from the cover plate 2 of the pole connecting portion 51, that is, the tab connecting portion 52 is lower than the pole connecting portion 51, and 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 connecting portion 51, and the battery cell 3 will not block the welding of the pole connecting portion 51 and the pole 4. Then, the battery cell 3 is rotated by 90°, so that the battery cell 3 moves from the horizontal state to the vertical state, and the tab connecting portion 52 is pushed by the battery cell 3 to move close to the cover plate 2, and at this time, the deformation portion 53 rotates relative to the pole connecting portion 51 and the tab connecting portion 52, until the whole formed by the tab 31 and the tab connecting portion 52 enters the groove 21 and abuts against the groove bottom wall of the groove 21. Finally, the battery cell 3 is controlled to be loaded into the shell 1, and the cover plate 2 and the shell 1 are welded to obtain the battery monomer.

[0107] In some embodiments, when the whole formed by the tab connecting portion 52 and the tab 31 is located in the groove 21 and abuts against the groove bottom wall of the groove 21, as shown in FIG. 6, the tab connecting portion 52 can be higher than the pole connecting portion 51, that is, the tab connecting portion 52 is located above the pole connecting portion 51. Of course, it can be understood that the tab connecting portion 52 can also be in the same plane as the pole connecting portion 51, and the present embodiment does not limit this. Figure 3

[0108] It can be understood that, in the above assembly process, the welding sequence of the tab 31 and the pole 4 and the connecting piece 5 can be adjusted according to actual needs, for example, the pole connecting portion 51 and the pole 4 can be welded first, and then the tab connecting portion 52 and the tab 31 can be welded; the pole connecting portion 51 and the pole 4, and the tab connecting portion 52 and the tab 31 can be welded at the same time, and the present embodiment does not limit this.

[0109] It can be seen that, in the present embodiment, the tab connecting portion 52 of the connecting piece 5 is moved up and down to realize the "up and down movement of the battery cell 3 relative to the cover plate 2". When the pole connecting portion 51 of the connecting piece 5 and the pole 4 are welded, the tab connecting portion 52 is lower than the pole connecting portion 51, so as to avoid the interference between the battery cell 3 and the cover plate 2. When the welding is completed, the tab connecting portion 52 is pushed upward, so that the tab connecting portion 52 moves into the groove 21 of the cover plate 2, and the cover plate 2 accommodates the connecting piece 5, thereby ensuring the high space utilization and solving the problem that the interference between the cover plate 2 and the battery cell 3 affects the welding of the connecting piece 5 and the pole 4.

[0110] The battery monomer provided in the present embodiment includes the pole connecting portion 51, the tab connecting portion 52 and the deformation portion 53. The deformation portion 53 can rotate around the pole connecting portion 51 and the tab connecting portion 52, so that the relative position of the tab connecting portion 52 and the pole connecting portion 51 can be adjusted. When the pole connecting portion 51 and the pole 4 are welded, 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 does not block the pole connecting portion 51 and does not interfere with the welding of the pole connecting portion 51 and the pole 4, thereby reducing the connection difficulty of the pole connecting portion 51 and the pole 4, and further reducing the assembly difficulty of the battery monomer. By providing the groove 21 on the cover plate 2, at least part of the tab connecting portion 52 can be located in the groove 21, thereby improving the space utilization of the battery monomer and enabling the battery monomer to have a higher capacity.

[0111] Furthermore, when the pole 4 and the pole connecting portion 51 are welded, the tab connecting portion 52 and the pole connecting portion 51 are not welded in the same plane, which is conducive to the identification and positioning of the welding areas of the two by the welding equipment. Furthermore, the two welding areas can be prevented from affecting each other due to the close proximity, so as to avoid the welding quality problems such as the generation of welding explosion points in the welding area welded later, and the battery monomer provided in the present embodiment has high welding quality during welding.​

[0112] In some possible implementations, such as Figure 3 As shown, the battery cell also includes an insulating structure, at least part of which is disposed in the groove 21 and is used for insulation between the cover plate 2 and the cell 3, so as to prevent the cell 3 from short-circuiting with the cover plate 2 when the cover plate 2 is made of metal.

[0113] In some possible implementations, the insulating structure is a lower insulating member 6, which is made of an insulating material and serves as insulation between the cover plate 2 and the battery cell 3. For example, as shown... 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. 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 connecting piece 5 and the electrode tab 31 are received in the receiving groove 62 of the lower insulating member 6. The electrode post 4 passes through the lower insulating member 6 and is connected to the electrode post connecting part 51. The integral structure formed by the electrode tab connecting part 52 and the electrode tab 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.

[0114] In other possible implementations, the insulating structure is an insulating coating. That is, the lower insulating member 6 may not be provided on the inner side of the cover plate 2. Instead, an insulating material is coated on the bottom of the groove 21 of the cover plate 2 to form an insulating coating, which replaces the lower insulating member 6. This embodiment does not limit this.

[0115] In this embodiment, the angle between the deformable portion 53 and the pole post connecting portion 51 depends on the contact area between the pole post connecting portion 51 and the pole post 4 (i.e., the area of ​​welding between the pole post connecting portion 51 and the pole post 4), and the angle between the deformable portion 53 and the tab connecting portion 52 depends on the contact area between the tab connecting portion 52 and the tab 31 (i.e., the area of ​​welding between the tab connecting portion 52 and the tab 31). The minimum dimensions of the pole post connecting portion 51 and the tab connecting portion 52 are equal to the weld mark dimensions. Since a clamp is needed to hold them in place during welding, the dimensions of the pole post connecting portion 51 and the tab connecting portion 52 must be slightly larger than the weld mark dimensions. When the pole post connecting portion 51 is at its minimum value, the angle between the deformable portion 53 and the pole post connecting portion 51 reaches its maximum value; when the tab connecting portion 52 is at its minimum value, the angle between the deformable portion 53 and the tab connecting portion 52 reaches its maximum value. The larger the size of the tab connection portion 52, the smaller the angle between the tab connection portion 52 and the deformable portion 53; the larger the size of the pole connection portion 51, the smaller the angle between the pole connection portion 51 and the deformable portion 53. In order to ensure that the deformable portion 53 bends well and that the cell 3 applies upward force, the tab connection portion 52 and the deformable portion 53 can move upward. The angle between the deformable portion 53 and the pole connection portion 51 is greater than or equal to 90°, and the angle between the deformable portion 53 and the tab connection portion 52 is greater than or equal to 90°.

[0116] In some embodiments, as shown in Figure 7 A first angle a is formed between the deformation 53 and the pole post connecting portion 51, and a second angle β is formed between the deformation 53 and the tab connecting portion 52. In order to ensure the size of the welding mark and facilitate the pressing of the connecting tab 5 and the tab 31 by the jig during welding, 90°≤a≤170°, 90°≤β≤170°. In some embodiments, 100°≤a≤150°, 100°≤β≤150°. For example, the first angle a 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.

[0117] In order to ensure that the pole post connecting portion 51 and the tab connecting portion 52 are parallel or approximately parallel, the first angle a and the second angle β are equal, for example. Due to manufacturing errors of the connecting tab 5, the first angle a and the second angle β are not exactly equal, and in this embodiment, it is necessary to ensure that the difference between the first angle a and the second angle β is within a certain range. In some embodiments, the difference T between the first angle a and the second angle β satisfies: -20°≤T≤20°. For example, -10°≤T≤10°. For example, the difference T between the first angle a and the second angle β is -20°, -10°, 0°, 10°, 15°, 20°. When the first angle a and the second angle β are equal, T=0.

[0118] In this embodiment, the connecting tab 5 includes an assembled state and an unassembled state. In the assembled state, Figure 2 , Figure 3 , Figure 8 and Figure 9 are schematic views of the connecting tab 5 in the assembled state, at which time the connecting tab 5 is located in the groove 21. Figure 5 and Figure 7 are schematic views of the connecting tab 5 in the unassembled state, at which time the tab connecting portion 52 of the connecting tab 5 is not located in the groove 21.

[0119] In order to make the tab 31 shorter, for example, as shown in Figure 7 , in the assembled state of the connecting tab 5, the height difference between the pole post connecting portion 51 and the tab connecting portion 52 in the thickness direction (i.e., the third direction Z) of the cover plate 2 is a first distance d1. As shown in Figure 2As shown, in the assembled state of the connecting piece 5, the distance between the outer edge of the tab connecting portion 52 and the outer edge of the cover plate 2 in the width direction of the cover plate 2 (i.e., the second direction Y) is a second distance d2. The distance between the outer edge of the tab connecting portion 52 and the outer edge of the cover plate 2 in the second direction Y is the distance between the edge of the tab connecting portion 52 facing away from the pole connecting portion 51 and the outer edge of the cover plate 2 closest to the pole connecting portion 51, i.e., the distance between the outer edge of the tab connecting portion 52 and the outer edge of the cover plate 2 on the same side of the pole 4.

[0120] It should be noted that the height difference between the pole connecting portion 51 and the tab connecting portion 52 in the third direction Z is related to the distance between the outer edge of the tab connecting portion 52 and the outer edge of the cover plate 2. As the first distance d1 increases, the size of the connecting piece 5 in the second direction Y decreases, so that the welding position of the tab connecting portion 52 and the tab 31 is closer to the middle of the cover plate 2 in the second direction Y. When the tab 31 has a multi-layer structure and the battery cell 3 has two, the side of one battery cell 3 closer to the other battery cell 3 is referred to as the inner side of the battery cell 3, and the side opposite to the inner side is referred to as the outer side of the battery cell 3. When the welding position of the tab connecting portion 52 and the tab 31 is closer to the middle of the cover plate 2 in the second direction Y, the length of the inner side tab 31 (the tab 31 farther away from the shell 1) needed is longer, and the length of the outer side tab 31 (the tab 31 closer to the shell 1) needed is shorter. Therefore, as the first distance d1 increases, the second distance d2 also increases, so that the inner side tab 31 becomes longer and the outer side tab 31 becomes shorter. In the present 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.

[0121] In the present embodiment, the first distance d1 and the second distance d2 satisfy the above relationship, so that the tab 31 of the battery cell provided in the present embodiment can be very short, thereby avoiding the stacking of the tab 31, further reducing the space waste caused by the length of the tab 31, and ensuring that all the tabs 31 can be accommodated in the groove 21.

[0122] In the present 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.

[0123] Generally, the battery monomer includes two pole posts 4 and two connecting pieces 5, the pole posts 4 and the connecting pieces 5 are connected one by one, one connecting piece 5 is electrically connected with the positive electrode ear of the battery cell 3, and the other connecting piece 5 is electrically connected with the negative electrode ear of the battery cell 3.

[0124] Exemplarily, as shown in Figure 2 and Figure 4 shown, two battery cells 3 are arranged in the shell 1 in the embodiment, and the two battery cells 3 are oppositely arranged in the second direction Y. Exemplarily, as shown in Figure 8 each connecting piece 5 includes two electrode ear connecting portions 52, the two electrode ear connecting portions 52 are located on both sides of the pole post connecting portion 51 in the width direction of the cover plate 2 (i.e. the second direction Y), and the deforming portion 53 is connected between each electrode ear connecting portion 52 and the pole post connecting portion 51, that is, the electrode ear connecting portion 52 and the deforming portion 53 are provided with two, the two deforming portions 53 are connected to both ends of the pole post connecting portion 51 in the second direction Y, and the two electrode ear connecting portions 52 are connected with the two deforming portions 53. The electrode ears 31 with the same polarity of the two battery cells 3 are connected to the two electrode ear connecting portions 52 of one connecting piece 5.

[0125] It can be understood that the number of grooves 21 on the cover plate 2 is the same as the number of connecting pieces 5, that is, the cover plate 2 is provided with two grooves 21. In some embodiments, the two grooves 21 in the embodiment are centrally symmetrically arranged, the two pole posts 4 are also centrally symmetrically arranged, the two connecting pieces 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 grooves 21 can be 1, and the two connecting pieces 5 are installed in the same groove.

[0126] Exemplarily, as shown in Figure 3 the electrode ear 31 is connected to the surface of the electrode ear connecting portion 52 facing the cover plate 2. In this way, the electrode ear connecting portion 52 and the cover plate 2 (specifically the groove bottom wall of the groove 21) clamp the electrode ear 31 together, so that the electrode ear connecting portion 52 supports and limits the electrode ear 31, avoiding the electrode ear 31 from being loose or the electrode ear 31 from being inserted into the battery cell 3 in reverse; and the electrode ear 31 fixed on the surface of the electrode ear connecting portion 52 facing the cover plate 2 can also be accommodated in the groove 21, further improving the space utilization of the battery monomer. In the embodiment, the end face of the electrode ear connecting portion 52 away from the deforming portion 53 is a circular arc surface, and the electrode ear 31 is connected to the surface of the electrode ear connecting portion 52 facing the cover plate 2 after bypassing the circular arc surface, so as to avoid scratching the electrode ear 31 by the electrode ear connecting portion 52.

[0127] It can be understood that the tab 31 can also be connected to the tab connecting portion 52 away from the surface of the cover plate 2. When the tab 31 is a multi-layer structure, part of the tab 31 can be connected to the tab connecting portion 52 towards the surface of the cover plate 2, and part of the tab 31 can be connected to the tab connecting portion 52 away from the surface of the cover plate 2, that is, the tab connecting portion 52 is clamped between the multi-layer tab 31. The present embodiment does not limit this.

[0128] In order to enable the end surface of the battery cell 3 towards the cover plate 2 to abut against the cover plate 2, in the present embodiment, the tab connecting portion 52, the post connecting portion 51 and the deformation portion 53 are all located in the groove 21, that is, as shown in Figure 3 , the surface of the tab connecting portion 52 away from the cover plate 2 and the surface of the post connecting portion 51 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 cooperatively limit the movement of the battery cell 3 in the third direction Z, thereby avoiding the battery cell 3 from bouncing in the shell 1, and improving the reliability of fixing the battery cell 3.

[0129] In an embodiment, as shown in Figure 1 , the outer surface of the cover plate 2 is provided with a protrusion 22 corresponding to the position of the groove 21, and the post 4 is arranged in the protrusion 22 so as to connect the post 4 with the post connecting portion 51 in the groove 21. By arranging the protrusion 22, the cover plate 2 does not need to be arranged to be thicker, thereby reducing the weight of the cover plate 2, and further enabling the weight of the battery monomer to be smaller. The number of the protrusions 22 and the grooves 21 corresponds one by one.

[0130] As shown in Figure 7 , the deformation portion 53 in the present embodiment is located between the tab connecting portion 52 and the post connecting portion 51 in the second direction Y. The rotation axis of the deformation portion 53 when rotating around the tab connecting 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 post connecting portion 51 is the second rotation axis (not shown in the figure). The first rotation axis and the second rotation axis both 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 tab connecting portion 52 is the first rotation axis, and the intersection of the deformation portion 53 and the post connecting portion 51 is the second rotation axis.

[0131] Exemplarily, as shown in Figure 8 and Figure 9 , the width of the tab connecting portion 52, the deformation portion 53 and the post connecting portion 51 is the same, that is, the size of the tab connecting portion 52, the deformation portion 53 and the post connecting portion 51 in the first direction X is the same, so as to facilitate assembly.

[0132] In some embodiments, the deformation portion 53 is a rigid structure, that is, the deformation portion 53 itself does not deform, but rotates relative to the post connecting portion 51 and the tab connecting portion 52.

[0133] The deformable part 53 can have various specific structures. This embodiment provides a deformable part 53 with the following three structures.

[0134] In the first structure of the deformable part 53, such as Figure 9 As shown, the deformable portion 53 includes multiple layers of deformable sheets 532. Each deformable sheet 532 is connected at both ends to the pole post connector 51 and the tab connector 52, and adjacent layers of deformable sheets 532 are not connected to each other. This provides space for the movement of each deformable sheet 532, facilitating its rotation relative to the pole post connector 51 and the tab connector 52, and thus facilitating the movement of the tab connector 52 into the groove 21. In this embodiment, the thickness of each deformable sheet 532 can be relatively thin.

[0135] In the second structure of the deformable part 53, such as Figure 7 As shown, the deformable portion 53 is provided with a weak region 531, through which the deformable portion 53 rotates relative to the tab connection portion 52 and the pole post connection portion 51. By providing the weak region 531, it is easier for the deformable portion 53 to rotate relative to the pole post connection portion 51 and the tab connection portion 52, thereby improving the success rate of assembly. For example, the weak region 531 can be formed by material thinning, drilling, or other methods, and this embodiment does not limit this.

[0136] In the third structure of the deformable part 53, the thickness of the deformable part 53 is less than the thickness of the tab connection part 52 and less than the thickness of the pole post connection part 51.

[0137] For example, such as Figure 9 As shown, the pole connector 51 may have a first overlapping portion 514, the thickness of which is less than the thickness of the pole connector 51. The tab connector 52 has a second overlapping portion 524, the thickness of which is less than the thickness of the tab connector 52. One end of the deformable portion 53 overlaps with the first overlapping portion 514 and the other end overlaps with the second overlapping portion 524, so that it can be supported by the first overlapping portion 514 and the second overlapping portion 524, thereby improving the connection strength and reliability between the deformable portion 53 and the pole connector 51 and the tab connector 52.

[0138] In some embodiments, the thickness of the deformable portion 53 is less than the thickness of the tab connection portion 52 and less than the thickness of the pole connection portion 51, and the thickness of the deformable portion 53 satisfies the following: the sum of the thicknesses of the first overlapping portion 514 and the deformable portion 53 is equal to the thickness of the pole connection portion 51, and the sum of the thicknesses of the second overlapping portion 524 and the deformable portion 53 is equal to the thickness of the tab connection portion 52, so that the surfaces of the tab connection portion 52 and the pole connection portion 51 are relatively flat, which facilitates the welding of the tab connection portion 52 and the tab 31, and also facilitates the welding of the pole connection portion 51 and the pole 4.

[0139] Of course, it can be understood that the structure of the deformation part 53 is not limited to the above three structures, and the above three structures of the deformation part 53 can also be combined with each other, and can be selected according to actual needs.

[0140] Embodiment two

[0141] The battery cell provided in the embodiment is different from that of embodiment one in that the structure of the deformation part 53 is different.

[0142] Specifically, as shown in Figures 10 to 15 , the deformation part 53 in the embodiment is a flexible structure, that is, the deformation part 53 can not only rotate relative to the pole connecting part 51 and the tab connecting part 52, but also can itself be deformed.

[0143] Exemplarily, as shown in Figure 12 , the deformation part 53 is a telescopic structure 54. One end of the telescopic structure 54 is connected to the pole connecting part 51 in the telescopic direction, and the other end is connected to the tab connecting part 52. The telescopic structure 54 can be telescopic, so that the distance between the tab connecting part 52 and the pole connecting part 51 is adjustable, so that when the tab connecting part 52 moves in the thickness direction (i.e. the third direction Z) of the cover plate 2, the tab 31 will not be pulled to move in the width direction (i.e. the second direction Y) of the cover plate 2, reducing the probability of failure of the tab 31, and improving the assembly effect of the battery cell.

[0144] Figure 13 and Figure 14 are schematic diagrams of the connecting sheet 5 provided in the embodiment in three states. Among them, Figure 13 , Figure (I) is a schematic diagram when the tab connecting part 52 does not enter the groove 21, at this time, the tab connecting part 52 is located below the pole connecting part 51, and in this state, the welding of the pole 4 and the pole connecting part 51, and the welding of the tab 31 and the tab connecting part 52 can be carried out. Figure 13 , Figure (III) is a schematic diagram when the tab connecting part 52 is located in the groove 21, at this time, the tab connecting part 52 is located above the pole connecting part 51. Figure 13 , Figure (II) is a schematic diagram when the tab connecting part 52 is coplanar with the pole connecting part 51. In the process of assembly, the connecting sheet 5 changes from Figure 13 , Figure (I) state, to Figure 13 , Figure (II) state, to Figure 13 , Figure (III) state. Among them, when the connecting sheet 5 is in Figure 13 , Figure (II) state, in order to avoid pulling the tab 31, the tab connecting part 52 will extrude the telescopic structure 54, at this time, the length of the telescopic structure 54 that can be accommodated is the shortest, therefore, the telescopic structure 54 is in the maximum contraction state. The connecting sheet 5 is in Figure 13In the state of Fig. (1) in the figure, the length of the telescopic structure 54 is not limited by the groove 21 and the position of the battery cell 3, and the telescopic structure 54 can accommodate the longest length, the telescopic structure 54 reaches the minimum contraction, and the telescopic structure 54 is almost in the straight state. The connecting piece 5 is in the state of Fig. (2) in the figure Figure 13 In the state of Fig. (3) in the figure, the telescopic structure 54 needs to contract to a certain extent due to the position of the battery cell 3, but the contraction degree is smaller than that of the connecting piece 5 in the state of Fig. (2) in the figure. Figure 13 In the state of Fig. (2) in the figure.

[0145] Exemplarily, in the telescopic direction of the telescopic structure 54, as shown in Figure 13 and Figure 14 , the minimum length of the telescopic structure 54 is L1, and the maximum length is L2. According to the internal and external redundancy of the length of the tab 31, the height difference b between the state of Fig. (2) and the state of Fig. (1) in the figure (13) is generally between 2mm and 8mm, and the value of b is slightly different according to the width of the groove 21, and the longest ratio of the telescopic structure 54 can be elongated is 1.1-1.5 times the shortest, that is, L2=1.1L1-1.5L1. As shown in Figure 14 , L1, L2, and b satisfy the relationship: L12+b 2 =L22; when b=2mm, L2=1.1L1, L1=17mm; when b=2mm, L2=1.5L1, L1=7.2mm; when b=8mm, L2=1.1L1, L1=4.2mm; when b=8mm, L2=1.5L1, L1=1.8mm; in summary, L1 can be 1.8mm-17mm, and L2 is 1.1L1-1.5L1.

[0146] In order to reduce the length of L1 as much as possible, that is, to reduce the length of the connecting piece 5 and reduce the cost. When b is larger, L2 should also be larger L1, that is, when b=8mm, L2 should be 1.5L1. L1=7.2mm. 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.

[0147] In some embodiments, please continue to refer to Figure 13 , the telescopic structure 54 includes a plurality of telescopic layers 541 arranged in layers, and each telescopic layer 541 is bent to form a plurality of folds 5411 arranged in the telescopic direction to realize the telescopic structure 54. By arranging the telescopic structure 54 to include a plurality of telescopic layers 541, the structural strength of the telescopic structure 54 can be improved, the telescopic difficulty of the telescopic structure 54 can be reduced, and the assembly of the battery monomer is facilitated.

[0148] Exemplarily, the stretchable layers 541 can be metal foils, and the thickness of each stretchable layer 541 ranges from 0.05 mm to 0.2 mm. If the thickness of the stretchable layer 541 is large, the stretchable layer 541 is not easy to stretch; if the thickness of the stretchable layer 541 is small, the stretchable layer 541 is easy to break. For example, the thickness of the stretchable layer 541 can be 0.05 mm, 0.08 mm, 0.1 mm, 0.15 mm, 0.2 mm, etc.

[0149] When assembling the battery cell provided in the embodiment, as shown in Figure 15 When welding the tab connecting portion 52 and the tab 31, and the post connecting portion 51 and the post 4, the cell 3 can be in a horizontal state. After the welding is completed, if the cells need to be combined, the cell 3 is rotated and pushed upward at the same time. At this time, the tab connecting portion 52 moves towards the post connecting portion 51, and the stretchable structure 54 is compressed to be the shortest, and the cell 3 is continuously pushed upward until the whole formed by the tab connecting portion 52 and the tab 31 abuts against the groove bottom wall of the groove 21, and the end surface of the cell 3 abuts against the cover plate 2.

[0150] The other structures in the embodiment are similar to the corresponding structures in the first embodiment and have similar beneficial effects. The embodiment will not be described in detail here.

[0151] Embodiment Three

[0152] The battery cell provided in the embodiment is different from the first embodiment in the structure of the connecting piece.

[0153] Specifically, the rotation axis of the deformation portion 53 when rotating around the tab connecting portion 52 is a first rotation axis, and the rotation axis of the deformation portion 53 when rotating around the pole connecting portion 51 is a second rotation axis, both of which extend along the width direction of the cover plate 2. It should be noted that in the case of a narrow cover plate 2, when the connecting sheet 5 is provided with the pole connecting portion 51, the tab connecting portion 52, and the deformation portion 53 along the width direction (i.e., the second direction Y) of the cover plate 2, the space is limited, resulting in the need for a smaller area of the tab connecting portion 52 and the pole connecting portion 51, which increases the difficulty of operation. In the present embodiment, however, both the first rotation axis and the second rotation axis extend along the second direction Y, so that the pole connecting portion 51, the deformation portion 53, and the tab connecting portion 52 can be provided along the first direction X, so that the length of the pole connecting portion 51 and the tab connecting portion 52 in the first direction X can be longer, and thus the pole connecting portion 51 and the tab connecting portion 52 can have a larger connection area, facilitating the connection of the pole 4 and the pole connecting portion 51, and the connection of the tab 31 and the tab connecting portion 52. Moreover, for the case where the battery monomer includes two battery cells 3, it is not necessary to provide two deformation portions 53 and two tab connecting portions 52, and the two battery cells 3 can share one deformation portion 53, thereby reducing the number of deformation portions 53, and further reducing the cost of the connecting sheet 5 and ensuring the structural strength of the connecting sheet 5.

[0154] In the present embodiment, as shown in FIG. 1, the battery cell 3 is provided with one, and the connecting sheet 5 and the pole 4 are each provided with two and are correspondingly connected, as shown in FIG. 2, each connecting sheet 5 includes one tab connecting portion 52. As shown in FIG. 3, the two connecting sheets 5 in the present embodiment are centrally symmetrically arranged, and the two poles 4 are also centrally symmetrically arranged, and the two tabs 31 of the battery cell 3 are also centrally symmetrically arranged, and the centers of symmetry and the symmetry axes O of the three are the same. Moreover, the tab connecting portions 52 of the two connecting sheets 5 are located on opposite sides of the two pole connecting portions 51, that is, the tab connecting portion 52 of one connecting sheet 5 is located on the side of the pole connecting portion 51 facing the other connecting sheet 5. Figure 17 Figure 18 Figure 19

[0155] For example, when the battery cell 3 is provided with one, the tab 31 of one battery cell 3 is connected to any one of the two surfaces in the thickness direction of the tab connecting portion 52.

[0156] In some embodiments, the tab 31 of the battery cell 3 is connected to the surface of the tab connecting portion 52 facing the cover plate 2, so as to reduce the occupation of the accommodation space by the tab 31 and reduce the redundancy of the tab 31. In some embodiments, as shown in FIG. 4, the tab connecting portion 52 has an arc surface 525, and the tab 31 is connected to the surface of the tab connecting portion 52 facing the cover plate 2 after passing around the arc surface 525, so as to avoid scratching the tab 31 by the edges and corners of the tab connecting portion 52. Figure 18

[0157] ​​​​In some possible implementations, such as Figure 21 As shown, a protrusion 22 is provided on the outer surface of the cover plate 2 at the position corresponding to the groove 21. The minimum distance between the edge of the protrusion 22 and the housing 1 in the width direction (i.e., the second direction Y) of the cover plate 2 is the third distance d3. The electrode tab 31 includes an inclined portion 311 and a straight portion 312. The inclined portion 311 is led out from the battery cell 3, and the straight portion 312 is connected to the electrode tab connecting portion 52. The minimum distance between the straight portion 312 and the side wall of the battery cell 3 is the fourth distance d4.

[0158] Since the tab 31 is accommodated by the groove 21 in this embodiment, in order to enter the groove 21, with the tab 31 connected to the surface of the tab connection 52 facing the cover plate 2, the tab 31 needs to move towards the center of the cell 3 in the second direction Y after passing around the turning part of the arc surface 525. The position of the tab 31 exiting the cell 3 remains unchanged. Therefore, as... Figure 21 As shown, the length of the first inclined edge 3111 of the inclined portion 311 increases, while the length of the second inclined edge 3112 decreases. Therefore, it is necessary to increase the distance between the straight portion 312 and the side wall of the cell 3 (i.e., the fourth distance d4), because increasing 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 housing 1 in the width direction (i.e., the second direction Y) of the cover plate 2 (i.e., the third distance d3) is related to the minimum distance between the straight portion 312 and the side wall of the cell 3 (i.e., the fourth distance d4), and this relationship is positive.

[0159] For example, the third distance d3 and the fourth distance d4 satisfy: 0.8d3≤d4≤2.5d3; 1mm≤d3≤10mm. In some possible implementations, d3≤d4≤2d3; 2mm≤d3≤8mm. For example, the value of d3 is 2mm, 4mm, 6mm, or 8mm.

[0160] Following on from the previous text, if it is necessary to simultaneously increase or decrease the length of the first inclined edge 3111 and the second inclined edge 3112, in Figure 21 Based on this, cell 3 can be moved to the left or right as a whole.

[0161] In this embodiment, after the battery cell 3 is installed inside the housing 1, it needs to be centered within the housing 1, and the cover plate 2 needs to fit snugly into the opening of the housing 1. Therefore, along the length of the cover plate 2, the central axis of the cover plate 2 and the center of the battery cell 3 should be approximately collinear. However, the battery cell 3 will shift as the connecting piece 5 rotates. Therefore, 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 (i.e., when the electrode connection portion 51 of the connecting piece 5 and the electrode 4 are welded), the battery cell 3 is offset relative to the cover plate 2 to compensate for the difference in offset after the connecting piece 5 rotates (e.g., ...). Figure 20The eighth distance d9 in the middle. The offset is between 0.5mm and 20mm, preferably between 2mm and 10mm. This offset can compensate for the amount of offset of the tab 31 to the left after the deformation part 53 of the connecting piece 5 straightens after the battery cell 3 is combined, so as to avoid the tab 31 being torn by force after the battery cell is combined, thereby ensuring the current carrying capacity of the tab 31.

[0162] The other structures in this embodiment are similar to the corresponding structures in Embodiment 1 and have similar beneficial effects, and will not be described in detail here.

[0163] Example 4

[0164] The difference between the battery cell provided in this embodiment and that in Embodiment 3 is that the relative positions of the tab connection and the terminal connection are different.

[0165] Specifically, in this embodiment, as Figure 22 and Figure 23 As shown, there are two pole posts 4 and two connecting pieces 5. Each pole post 4 is connected to a corresponding connecting piece 5, and each pole post 4 is connected to the pole post connecting part 51 of the corresponding connecting piece 5.

[0166] Each connecting piece 5 includes a tab connecting portion 52 and a pole connecting portion 51. The two tab connecting portions 52 are connected to the two pole connecting portions 51 on the same side along the length direction (i.e., the first direction X) of the cover plate 2, ensuring that the two tabs 31 are offset in the same direction during assembly, greatly reducing the risk of tearing. The fact that the two tab connecting portions 52 are connected to the two pole connecting portions 51 on the same side along the length direction (i.e., the first direction X) of the cover plate 2 means that the two tab connecting portions 52 face the same direction.

[0167] It should be noted that the axis of rotation of the deformable part 53 around the tab connecting part 52 is the first axis of rotation. When the tab connecting part 52 rotates around the first axis of rotation, the tab connecting part 52 will move not only 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 offset directions of the tab connecting parts 52 of the two connecting pieces 5 are opposite. In this case, the tab 31 connected to the corresponding tab connecting part 52 will also be driven to offset in the opposite direction, causing the tab 31 to be subjected to force and tear, resulting in low reliability. However, in this embodiment, the offset directions of the two tabs 31 are the same. Figure 22 In this design, both tabs 31 are offset to the left or to the right, which avoids the problem of the tabs 31 being pulled and torn, thus ensuring high reliability.

[0168] In the present embodiment, the cover plate 2 is provided with a pole through hole (not shown in the figure) for mounting the poles 4. In the present embodiment, the welding position of the poles 4 and the pole connecting portion 51 is below the pole through hole. And, since the orientations of the tab connecting portions 52 of the two connecting tabs 5 are adjusted, the two connecting tabs 5 in the present embodiment are not centrosymmetric, and further, the two poles 4 are not centrosymmetric.

[0169] The other structures in the present embodiment are similar to the corresponding structures in Embodiment Three and have similar beneficial effects, which will not be described in detail herein.

[0170] Embodiment Five

[0171] The battery cell provided in the present embodiment is different from that in Embodiment Four in the structure of the poles.

[0172] Specifically, in the present embodiment, two poles are provided, and two connecting tabs are provided, one connecting tab is connected to each pole, and each pole is connected to the pole connecting portion of the corresponding connecting tab.

[0173] In the present embodiment, one of the two poles includes 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 connecting tab and extends towards the direction of the other pole. The extension portion is connected to the corresponding pole connecting portion, and the two poles are distributed centrosymmetrically 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 orientations of the tab connecting portions of the two connecting tabs are the same, i.e., the two tab connecting portions are located on the same side of the two pole connecting portions, and the two poles are distributed symmetrically, which facilitates the connection of the bus bar.

[0174] It should be noted that when the two poles on the cover plate are not centrosymmetrically arranged, it will affect the welding of the poles and the bus bar of the battery, and in the present embodiment, the bottom of one of the poles is extended towards the direction close to the other pole to form an extension portion, which is used to connect to the pole connecting portion, so that the projection of the pole through hole of the cover plate, the pole passing through the pole through hole and the welding area of the pole connecting portion in the third direction do not overlap, thereby realizing the same orientation of the tab connecting portions of the two connecting tabs and the centrosymmetric distribution of the two poles, and not affecting the welding of the poles and the bus bar.

[0175] On this basis, since part of the area of the tab connecting portion overlaps with the bottom of the pole in the thickness direction of the cover plate, it is necessary to extend the tab connecting portion in the width direction of the cover plate to avoid the bottom of the pole, so that the tab is connected to the extended part of the tab connecting portion, and the extended part of the tab connecting portion and the tab can be completely accommodated in the groove, so as to improve the space utilization rate of the battery cell.

[0176] It should be noted that the battery cell provided in the embodiment can be applied to a battery cell with a relatively long length, and can also be applied to a battery cell with a relatively small length, and has a wide application range.

[0177] Other structures in the embodiment are similar to the corresponding structures in Embodiment Four and have similar beneficial effects, and will not be described in detail herein.

[0178] Embodiment Six

[0179] The battery cell provided in the embodiment is different from that in Embodiment Four in that the setting positions of the pole posts are different.

[0180] Specifically, as shown in Figure 24 and as shown in Figure 25 , the two tab connecting portions 52 of the two connecting pieces 5 in the embodiment are oriented in the same direction, that is, the two tab connecting portions 52 are located on the same side of the two pole post connecting portions 51, so as to avoid the problem of tearing of the tabs 31. Moreover, the two pole posts 4 in the 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, so as to facilitate the welding of the pole posts 4 and the bus bar and reduce the assembly difficulty. However, the two groups of tabs 31 in the embodiment are asymmetrically distributed.

[0181] Exemplarily, as shown in Figure 24 , there is a blank area at the right end of the cover plate 2, so that the two pole posts 4 can be centrally symmetrically distributed.

[0182] It should be noted that the structure provided in the embodiment is applicable to a battery cell with a relatively large length, for example, can be applied to a battery cell with a length greater than 200 mm. If the length of the battery cell is relatively small, the lengths of the battery cell 3 and the tab 31 in the first direction X are relatively small, which cannot meet the requirement of overcurrent.

[0183] Other structures in the embodiment are similar to the corresponding structures in Embodiment Four and have similar beneficial effects, and will not be described in detail herein.

[0184] Embodiment Seven

[0185] The battery cell provided in the embodiment is different from that in Embodiment Three in that the number of battery cells is different.

[0186] Specifically, in the embodiment, two battery cells are provided, and two connecting pieces and two pole posts are correspondingly provided, each connecting piece comprising a pole post connecting portion and a tab connecting portion. The two battery cells are arranged along the width direction (i.e., the second direction) of the cover plate, and the tabs of the two battery cells are symmetrically welded to the two surfaces in the thickness direction of the tab connecting portion.

[0187] The other structures in this embodiment are similar to the corresponding structures in Embodiment Three and have similar beneficial effects. This embodiment will not be described in detail here.

[0188] Embodiment Eight

[0189] The battery cell provided in this embodiment differs from that in Embodiment One in the structure of the connecting piece.

[0190] Specifically, as shown in Figures 26 to 34 , the battery cell 3 is provided with two, and the connecting piece 5 and the pole 4 are provided with two one-to-one, and each connecting piece 5 is electrically connected with the corresponding pole 4. Each connecting piece 5 includes a pole connecting part 51 and a tab connecting part 52, and the pole connecting part 51 and the tab connecting part 52 are connected through a deformation part 53. It should be noted that in this embodiment, the first rotation axis when the deformation part 53 rotates around the tab connecting part 52 and the second rotation axis when the deformation part 53 rotates around the pole connecting part 51 both extend along the second direction Y.

[0191] Exemplarily, as shown in Figure 28 , the tab connecting part 52 includes a first connecting structure 521, a first transition structure 522, and a second connecting structure 523. Among them, the deformation part 53 is connected between the first connecting structure 521 and the pole connecting part 51, so that the deformation part 53 can rotate relative to the first connecting structure 521 and can rotate relative to the pole connecting part 51. The first transition structure 522 is connected between the first connecting structure 521 and the second connecting structure 523, so that there is a height difference between the first connecting structure 521 and the second connecting structure 523, and the second connecting structure 523 is connected with the tab 31. It should be noted that the connection between the first connecting structure 521 and the second connecting structure 523 is a hard connection, that is, the connection between the first connecting structure 521 and the second connecting structure 523 cannot rotate. By providing 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, the first connecting structure 521 and the second connecting structure 523 can be abutted between the cover plate 2 and the battery cell 3, so as to better support the battery cell 3, reduce the probability of the battery cell 3 jumping, and have higher stability.

[0192] It should also be noted that the height difference between the first connecting structure 521 and the second connecting structure 523 specifically refers to the spacing of the first connecting structure 521 and the second connecting structure 523 in the third direction Z. More specifically, as shown in Figure 30 , the height difference between the first connecting structure 521 and the second connecting structure 523 can be the distance between the top surface of the first connecting structure 521 and the top surface of the second connecting structure 523 in the third direction Z.

[0193] Exemplarily, as shown in Figure 30As shown, when the connecting piece 5 is in the assembled state, the height difference between the first connecting structure 521 and the second connecting structure 523 is the fifth distance d5. Wherein, 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.

[0194] In some embodiments, when the connecting piece 5 is in an unassembled state, the pole connecting portion 51 is located below the second connecting structure 523, and the height difference between the pole connecting portion 51 and the second connecting structure 523 is a 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.

[0195] For example, such as Figure 31 As shown, when the connecting piece 5 is in the assembled state, the pole connecting part 51 is basically flush with the first connecting structure 521, and the second connecting structure 523 and the electrode tab 31 are both located in the groove 21. At this time, the height difference between the pole connecting part 51 and the second connecting structure 523 is reduced to 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.

[0196] In this embodiment, Figure 33 In this case, since the pole post connecting part 51 and the first connecting structure 521 are flush, that is, the pole post connecting part 51, the deformable part 53 and the first connecting structure 521 are coplanar, the second connecting structure 523 has already been pushed into the groove 21, and there is no need to push the connecting piece 5 further. Therefore, the second connecting structure 523 is in Figure 33 The direction shown only moves to the right and will not deviate back to the left. That is, the second connecting structure 523 and the third connecting structure 511 will only move as a whole away from the terminal connection portion 51, and after moving into place, they will not move towards the terminal connection portion 51. This ensures that the tab connection portion 52 will only shift in one direction, so the tab 31 will not be pulled left or right, reducing the risk of damage to the tab 31. Furthermore, the tab 31 can be better accommodated in the groove 21, increasing the space for accommodating the tab 31. Although the terminal connection portion 51 and the second connecting structure 523 are connected by a flexible part 53, the flexible part 53 is not entirely rigid. Therefore, after the battery cell is assembled, the terminal connection portion 51 can remain basically parallel to the second connecting structure 523.

[0197] In assembling the battery cell, it is only necessary to stop pushing the connecting piece 5 before the second connecting structure 523 of the tab connecting part 52 is deflected back, and it is only necessary to ensure that the second connecting structure 523 of the tab connecting part 52 has been pushed into the groove 21 at this time. When the pole connecting part 51 and the first connecting structure 521 are substantially parallel, it is a relatively extreme case, and deflection back occurs only when the first connecting structure 521 is continuously pushed to be higher than the pole connecting part 51. That is, as long as the first connecting structure 521 is lower than or flush with the pole connecting part 51, and the second connecting structure 523 enters the groove 21, the assembly of the battery cell can be achieved. Therefore, in the embodiment, the housing 1 ensures the depth of the second connecting structure 523 into the groove 21 by setting the height difference between the second connecting structure 523 and the first connecting structure 521.

[0198] If the first connecting structure 521 is lower than the pole connecting part 51 in the final form obtained after the battery cell is assembled, the first connecting structure 521 can abut against the end face of the battery cell 3 to maintain stability. Alternatively, the pole connecting part 51 and the first connecting structure 521 can jointly abut against the battery cell 3, that is, the pole connecting part 51 and / or the first connecting structure 521 abut against the end face of the battery cell 3. When the first connecting structure 521 abuts against the end face of the battery cell 3, the second connecting structure 523 can abut against the bottom wall of the groove 21. At this time, upward, the second connecting structure 523 abuts against the bottom wall of the groove 21, and downward, the first connecting structure 521 abuts against the end face of the battery cell 3. In combination with the hard connection between the first connecting structure 521 and the second connecting structure 523, the risk of the second connecting structure 523 falling downward under the influence of the use conditions during the use of the battery cell in the vehicle can be reduced, and the stability and reliability are high.

[0199] In some embodiments, as shown in Figure 31 and Figure 32 The battery cell in the embodiment includes two battery cells 3, and correspondingly, as shown in Figure 29 The tab connecting part 52 includes two second connecting structures 523 and two first transition structures 522. The two second connecting structures 523 are located on both sides of the first connecting structure 521 in the width direction, that is, in the second direction Y, the two second connecting structures 523 are located on both sides of the first connecting structure 521. Each second connecting structure 523 is connected to the first connecting structure 521 through a first transition structure 522. The tabs 31 of the two battery cells 3 with the same polarity are connected to the two second connecting structures 523. By providing two second connecting structures 523, the connection between the tabs 31 of the two battery cells 3 and the connecting piece 5 is facilitated. For example, the tabs 31 in the embodiment can be led out from the outer sides of the two battery cells 3 away from each other, so as to be welded with the two second connecting structures 523.

[0200] In some possible implementations, such as Figure 29 As shown, in this embodiment, the second connection structure 523 extends away from the pole post 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 post connection portion 51.

[0201] In another possible implementation, such as Figures 35 to 41 As shown, the second connecting structure 523 is a structure that extends toward the pole post connecting portion 51. That is, one end of the second connecting structure 523 is connected to the first transition structure 522, and the other end of the second connecting structure 523 is located on the side of the first connecting structure 521 toward the pole post connecting portion 51, and is located on at least one side of the pole post connecting portion 51 in the second direction Y.

[0202] Both types of connecting pieces 5 mentioned above can facilitate the assembly of battery cells and improve the space utilization of battery cells. They can be selected according to actual needs.

[0203] In some embodiments, the structures of the two connecting pieces 5 in a single battery cell may be the same or different; this embodiment does not limit this. Figure 27 As shown, the two connecting pieces 5 of the battery cell in this embodiment have different structures, one of which is... Figure 29 The connecting piece 5 shown is another connecting piece 5. Figure 36 Connector 5 is shown.

[0204] In some embodiments, to ensure that the two terminals 4 of the battery cell are arranged symmetrically along the center of the cover plate 2, such as... Figure 27 and Figure 41 As shown, one of the two pole posts 4 includes a pole post body 41 and an extension 42 connected to each other. The extension 42 is connected to the end of the pole post body 41 near the connecting piece 5 and extends towards the other pole post 4, connecting to the corresponding pole post connecting part 51. This arrangement results in the two pole posts 4 being centrally symmetrically distributed along the center of the cover plate 2, with the axis of symmetry O parallel to the width direction of the cover plate 2.

[0205] The other structures in this embodiment are similar to the corresponding structures in Embodiment 1 and have similar beneficial effects, and will not be described in detail here.

[0206] Example 9

[0207] The difference between the battery cell provided in this embodiment and that in Embodiment 3 lies in the structure of the connecting piece.

[0208] Specifically, such as Figures 42 to 48As shown, the two electric cores 3 are provided with two connection pieces 5 and two poles 4 respectively, and each connection piece 5 is electrically connected with the corresponding pole 4. Each connection piece 5 includes a pole connecting part 51 and a tab connecting part 52, and the pole connecting part 51 and the tab connecting part 52 are connected through a deformation part 53. It should be noted that in the embodiment, the first rotation axis of the deformation part 53 when rotating around the tab connecting part 52 and the second rotation axis of the deformation part 53 when rotating around the pole connecting part 51 both extend along the first direction X.

[0209] As shown in the figures, Figure 43 and Figure 44 The pole connecting part 51 includes 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. Among them, the third connecting structure 511 and the fourth connecting structure 512 have a height difference, and the connection between the third connecting structure 511 and the fourth connecting structure 512 is a hard connection, that is, the second transition structure 513 cannot rotate around the third connecting structure 511 and the fourth connecting structure 512, and the third connecting structure 511 and the fourth connecting structure 512 always have a height difference. The third connecting structure 511 is connected to the pole 4, and the deformation part 53 is connected between the fourth connecting structure 512 and the tab connecting part 52, so that the connection between the fourth connecting structure 512 and the tab connecting part 52 is a soft connection, and the deformation part 53 can rotate relative to the fourth connecting structure 512 and also can rotate relative to the tab connecting part 52. By setting the third connecting structure 511 and the fourth connecting structure 512 to have a height difference, the third connecting structure 511 and the fourth connecting structure 512 can be abutted between the cover plate 2 and the electric core 3, so as to better support the electric core 3 and reduce the probability of the electric core 3 jumping, and have higher stability.

[0210] It should be noted that the height difference between the third connecting structure 511 and the fourth connecting structure 512 specifically refers to the spacing of the third connecting structure 511 and the fourth connecting structure 512 in the third direction Z. More specifically, as shown in the figures, Figure 45 the height difference between the third connecting structure 511 and the fourth connecting structure 512 can be the distance between the top surface of the third connecting structure 511 and the top surface of the fourth connecting structure 512 in the third direction Z. As shown in the figures, Figure 45 in the assembled state of the connection piece 5, the height difference between the third connecting structure 511 and the fourth connecting structure 512 is a 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.

[0211] In some embodiments, as shown in Figure 43 and Figure 45 shown, when the connecting sheet 5 is in the unassembled state, the third connecting structure 511 is located above the fourth connecting structure 512, the tab connecting portion 52 is located above the third connecting structure 511, and the height difference between the tab connecting portion 52 and the third connecting structure 511 is an 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.

[0212] Exemplarily, as shown in Figure 47 shown, when the connecting sheet 5 is in the assembled state, the tab connecting portion 52 is substantially flush with the fourth connecting structure 512, the tab connecting portion 52, the tab 31, the fourth connecting structure 512, the deformation portion 53, and the third connecting structure 511 are all located in the groove 21, at this time, the height difference between the tab connecting portion 52 and the third connecting structure 511 is reduced to be the same as the height difference between the third connecting structure 511 and the fourth connecting structure 512, and the height difference between the third connecting structure 511 and the fourth connecting structure 512 remains unchanged.

[0213] Although the tab connecting portion 52 and the fourth connecting structure 512 are connected through the deformation portion 53, the deformation portion 53 is not completely soft, so after the battery monomer is assembled, the tab connecting portion 52 can remain substantially parallel to the fourth connecting structure 512.

[0214] In some embodiments, as shown in Figure 47 shown, the tab connecting portion 52 and the fourth connecting structure 512 abut against the groove bottom wall of the groove 21, and the third connecting structure 511 can abut against the end face of the battery cell 3 to limit the battery cell 3.

[0215] The battery monomer in this embodiment includes two battery cells 3, and correspondingly, the connecting sheet 5 includes two deformation portions 53 and two tab connecting portions 52 connected correspondingly. As shown in Figure 44 shown, the two deformation portions 53 are connected to the fourth connecting structure 512 on both sides in the width direction thereof, that is, the two deformation portions 53 are connected to the fourth connecting structure 512 on both sides in the second direction Y, so that the two tab connecting portions 52 can extend in the second direction Y away from the fourth connecting structure 512, thereby facilitating welding with the tab 31.

[0216] In the assembly process of the battery cell provided in this embodiment, since the connection between the third connecting structure 511 and the fourth connecting structure 512 is a rigid connection, and the connection between the fourth connecting structure 512 and the electrode connecting part 52 is a flexible connection, with the direction closer to the cover plate 2 as upward and the direction farther from the cover plate 2 as downward, when the connecting piece 5 is bent, such as... Figure 47 As shown, the fourth connecting structure 512 is located above the third connecting structure 511 and in the groove 21, while the tab connecting part 52 is located below the third connecting structure 511. After the connecting piece 5 is bent, the fourth connecting structure 512 and the tab connecting part 52 are flush and located together in the groove 21. During the entire movement of the cell 3 and the tab connecting part 52, the tab connecting part 52 moves relative to the fourth connecting structure 512 in a direction away from the fourth connecting structure 512 and then stops. That is, the tab connecting part 52 moves until it is flush with the fourth connecting structure 512. At this time, the deformable part 53, the tab connecting part 52 and the fourth connecting structure 512 are coplanar. The tab connecting part 52 will no longer deflect back towards the fourth connecting structure 512. Therefore, the tab 31 will not be pulled left or right, reducing the probability of the tab 31 being damaged during assembly.

[0217] The other structures in this embodiment are similar to the corresponding structures in Embodiment 3 and have similar beneficial effects, so they will not be described in detail here.

[0218] Secondly, this embodiment provides a battery, including the battery cell as described in the first aspect. The battery provided in this embodiment has a high space utilization rate, and thus a large capacity.

[0219] Thirdly, this embodiment provides an electrical device including a single battery cell as described in the first aspect; or, the electrical device includes a battery as described in the second aspect. The electrical device provided in this embodiment can have a high space utilization rate.

[0220] For example, electrical devices include, but are not limited to: mobile phones, portable devices, laptops, electric vehicles, electric cars, ships, spacecraft, electric toys, and power tools, etc. For example, spacecraft include airplanes, rockets, space shuttles, and spacecraft, etc. Electric toys include stationary or mobile electric toys, such as game consoles, electric vehicle toys, electric ship toys, and electric airplane toys, etc. Power 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.

[0221] It should be noted that the above only the preferred embodiments of the present application and the use of technical principles. Those skilled in the art will understand that the present application is not limited to the specific embodiments described herein, those skilled in the art can make various obvious changes, re-adjustment and replacement without departing from the scope of the present application. Therefore, although the above embodiments of the present application has been described in more detail, but the present application is not limited to the above examples, without departing from the concept of the present application, but also can include more other equivalent embodiments, and the scope of the present application is determined by the appended claims.

Claims

1. A battery cell, comprising a housing (1), a cover plate (2), a battery cell (3), and terminals (4), wherein the cover plate (2) is connected to the housing (1) and cooperates with the housing (1) to form an accommodating space, the battery cell (3) is placed in the accommodating space, and the terminals (4) are mounted on the cover plate (2), characterized in that, The battery cell also includes: The connecting piece (5) includes a pole connection part (51), a tab connection part (52), and a deformable part (53). The deformable part (53) is connected between the pole connection part (51) and the tab connection part (52). The deformable part (53) can rotate around the tab connection part (52) and can rotate around the pole connection part (51). The tab connection part (52) is connected to the tab (31) of the battery cell (3), and the pole connection part (51) is connected to the pole (4). The cover plate (2) has a groove (21) on its surface facing the battery cell (3), and at least part of the connecting piece (5) is located in the groove (21). An insulating structure, at least a portion of which is disposed in the groove (21) and serves as insulation between the cover plate (2) and the battery cell (3).

2. The battery cell according to claim 1, characterized in that, A first angle α is formed between the deformable part (53) and the pole post connecting part (51), and a second angle β is formed between the deformable part (53) and the pole tab connecting part (52); the difference T between the first angle α and the second angle β satisfies: -20°≤T≤20°; And / or, a first angle α is formed between the deformable part (53) and the pole post connecting part (51), and a second angle β is formed between the deformable part (53) and the pole tab connecting part (52); the difference T between the first angle α and the second angle β satisfies: T = 0; And / or, a first angle α is formed between the deformable part (53) and the pole post connecting part (51), and a second angle β is formed between the deformable part (53) and the pole tab connecting part (52); the first angle α and the second angle β are equal, 90°≤α≤170°.

3. The battery cell according to claim 1, characterized in that, The first axis of rotation of the deformable part (53) when it rotates around the electrode connecting part (52) is the first axis of rotation, and the second axis of rotation of the deformable part (53) when it rotates around the electrode connecting part (51) is the second axis of rotation. Both the first axis of rotation and the second axis of rotation 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 part (51) and the pole lug connecting part (52) in the thickness direction of the cover plate (2) is a first distance d1. In the width direction of the cover plate (2), the distance between the outer edge of the pole lug connecting part (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 1-4, characterized in that, The deformable part (53) is a rigid structure; or, the deformable part (53) is a flexible structure.

6. The battery cell according to any one of claims 1-4, characterized in that: The electrode tab (31) is connected to the electrode tab connecting part (52) facing the surface of the cover plate (2); And / or, The cover plate (2) has a protrusion (22) on the surface facing away from the battery cell (3) at the position corresponding to the groove (21), and the electrode post (4) is disposed on the protrusion (22); And / or, The surface of the pole connector (51) facing away from the cover plate (2) is located in the groove (21).

7. The battery cell according to any one of claims 1-4, characterized in that, The deformable part (53) is a flexible structure and a telescopic structure (54). One end of the telescopic structure (54) is connected to the pole post connecting part (51) in the telescopic direction, and the other end is connected to the pole tab connecting part (52).

8. The battery cell according to claim 7, characterized in that, The telescopic structure (54) includes a plurality of telescopic layers (541) stacked together, wherein the telescopic layers (541) are bent to form a plurality of pleats (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, the maximum length is L2, and L2 = (1.1~1.5)L1; wherein, 1.8mm≤L1≤17mm.

9. The battery cell according to any one of claims 1-4, characterized in that, The thickness of the deformable part (53) is less than the thickness of the tab connection part (52) and less than the thickness of the pole post connection part (51); Alternatively, the deformable part (53) is provided with a weak area (531), and the deformable part (53) rotates relative to the tab connection part (52) and the pole post connection part (51) through the weak area (531); Alternatively, the deformable part (53) may include multiple layers of deformable sheets (532).

10. The battery cell according to any one of claims 1-4, characterized in that, The connecting piece (5) includes two electrode connecting parts (52), which are located on both sides of the pole connecting part (51) in the width direction of the cover plate (2), and each electrode connecting part (52) is connected to the pole connecting part (51) by the deformable part (53).

11. The battery cell according to claim 1 or 2, characterized in that, The first axis of rotation of the deformable part (53) when it rotates around the tab connection part (52) is the first axis of rotation, and the second axis of rotation of the deformable part (53) when it rotates around the pole post connection part (51) is the second axis of rotation. Both the first axis of rotation and the second axis of rotation extend along the width direction of the cover plate (2).

12. The battery cell according to claim 11, characterized in that, The outer surface of the cover plate (2) is provided with a protrusion (22) corresponding to the position of 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 the third distance d3. The electrode (31) includes an inclined part (311) and a straight part (312). The inclined part (311) is led out from the battery cell (3). The straight part (312) is connected to the electrode connecting part (52). The minimum distance between the straight part (312) and the side wall of the battery cell (3) is the fourth distance d4. 0.8d3≤d4≤2.5d3; 1mm≤d3≤10mm; Alternatively, the connecting piece (5) includes one of the tab connecting portions (52); when one of the battery cells (3) is provided, the tab (31) of one of the battery cells (3) is connected to either of the two surfaces in the thickness direction of the tab connecting portion (52); when two of the battery cells (3) are provided, the two battery cells (3) are arranged along the width direction of the cover plate (2), and the tabs (31) of the two battery cells (3) are symmetrically welded to the two surfaces in the thickness direction of the tab connecting portion (52); Alternatively, there are two pole posts (4) and two connecting pieces (5), each pole post (4) corresponds to one connecting piece (5), and each pole post (4) is connected to the pole post connecting part (51) of the corresponding connecting piece (5); each connecting piece (5) includes one pole tab connecting part (52), and the two pole tab connecting parts (52) are connected to the two pole post connecting parts (51) on the same side of the length direction of the cover plate (2).

13. The battery cell according to claim 12, characterized in that: One of the pole posts (4) includes a pole post body (41) and an extension (42) connected to each other. The extension (42) is connected to one end of the pole post body (41) near the connecting piece (5) and extends toward the other pole post (4). The extension (42) is connected to the corresponding pole post connecting part (51). The two pole posts (4) are centrally symmetrically distributed along the center of the cover plate (2), and the axis of symmetry (O) of the two pole posts (4) is parallel to the width direction of the cover plate (2).

14. The battery cell according to claim 11, characterized in that, The tab connection portion (52) includes a first connection structure (521), a first transition structure (522), and a second connection structure (523). The deformable portion (53) is connected between the first connection structure (521) and the pole post 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). The second connection structure (523) is connected to the tab (31).

15. The battery cell according to claim 14, characterized in that, The height difference between the first connecting structure (521) and the second connecting structure (523) is the fifth distance d5, 0.5mm≤d5≤4mm; And / or, The pole connection part (51) and / or the first connection structure (521) abut against the end face 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) 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 width direction of the first connection structure (521) and are connected to the first connection structure (521) through a first transition structure (522). And / or, One end of the second connecting structure (523) is connected to the first transition structure (522), and the other end of the second connecting structure (523) is located on the side of the first connecting structure (521) facing away from the pole post connecting part (51); or, one end of the second connecting structure (523) is connected to the first transition structure (522), and the other end of the second connecting structure (523) is located on the side of the first connecting structure (521) facing the pole post connecting part (51).

17. The battery cell according to claim 3, characterized in that, The pole post connection part (51) includes a third connection structure (511), a fourth connection structure (512), and a second transition structure (513) connecting 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). The third connection structure (511) is connected to the pole post (4). The deformable part (53) is connected between the fourth connection structure (512) and the tab connection part (52).

18. The battery cell according to claim 17, characterized in that, The fourth connecting structure (512) and the electrode connecting part (52) are both located in the groove (21), and the electrode connecting part (52) abuts against the bottom wall of the groove (21); the height difference between the third connecting structure (511) and the fourth connecting structure (512) is the seventh distance d7, 0.5mm≤d7≤4mm; And / or, The connecting piece (5) includes two deformable parts (53) and two tab connecting parts (52) connected to each other. The two deformable parts (53) are connected to the fourth connecting structure (512) on both sides in its width direction.

19. A battery, characterized in that, Includes the battery cell as described in any one of claims 1-18.

20. An electrical appliance, characterized in that, It includes a battery cell as described in any one of claims 1-18; or, the electrical device includes a battery as described in claim 19.

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