Battery

Abstract

The utility model discloses a battery which comprises a battery connecting piece arranged between a pole and a first collector plate, and / or arranged between an end cover and a second collector plate, the battery connecting piece comprises a first connecting part, a second connecting part with an annular structure and an elastic part, wherein the second connecting part is arranged on the radial outer side of the first connecting part and is connected with the first connecting part through the elastic part; the axial gap between the first connecting part and the second connecting part is h, h is larger than 0, the first connecting part or the second connecting part is welded to the electric connecting piece, and the ratio of the size a of the elastic part to the size b of the first connecting part or the second connecting part is larger than or equal to 0.1 and smaller than or equal to 1 along the radial side of the second connecting part. Therefore, the battery connecting piece is provided with the elastic part, so that an axial deformation space can be provided for a part connected with the first connecting part and the second connecting part, and the size design of the first connecting part or the second connecting part and the elastic part can improve the safety of the structure and meet the overcurrent requirement at the same time.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a battery. Background Art

[0002] With the development of battery technology, further requirements are put forward for the speed of fast charging. In the current electrical connection technology of cylindrical batteries, a sheet-like current collector is used at the pole end to connect the pole and the winding core, and the winding core cannot move axially relative to the pole; a sheet-like current collector is used at the non-pole end to connect the end cover and the winding core, and the winding core cannot move axially relative to the end cover; another type of current collector uses a spring structure. Although it can solve the problem of axial movement of the winding core, the size of the welding area between the current collector and the internal structure of the winding core is related to the resistance, and the addition of the spring structure will affect the welding area between the current collector and the internal structure of the winding core, thereby causing a change in resistance. Therefore, when designing the current collector structure, it is necessary to make the resistance design and the spring structure design meet the requirements of axial movement of the winding core and overcurrent at the same time. Utility Model Content

[0003] In view of this, an object of the utility model is to provide a battery, wherein the elastic portion of the battery connecting piece can provide space for axial relative movement of parts connected to the first connecting portion and the second connecting portion and meet the flow requirements, while improving the safety of the structure.

[0004] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0005] A battery, comprising a battery connecting piece, wherein the battery connecting piece is arranged between a pole and a first current collecting plate, and / or, between an end cover and a second current collecting plate;

[0006] The battery connecting piece comprises a first connecting portion, a second connecting portion of an annular structure, and an elastic portion, wherein:

[0007] The second connection portion is arranged radially outside the first connection portion and connected to the first connection portion through the elastic portion;

[0008] The axial gap between the first connecting portion and the second connecting portion is h, where h>0;

[0009] The first connection part or the second connection part is welded to the electrical connection piece, and along one radial side of the second connection part, the ratio of the dimension a of the elastic part to the dimension b of the first connection part or the second connection part is 0.1≤a / b≤1.

[0010] Optionally, in the above battery, a plurality of the elastic portions are arranged along the circumference of the first connecting portion, a first through hole is arranged between adjacent elastic portions, and a corner of the first through hole is a chamfer.

[0011] Optionally, in the above battery, at least part of the cross section of the elastic portion along the axial direction is curved, and the highest point and the lowest point of the cross section are both within the gap between the first connecting portion and the second connecting portion along the axial direction.

[0012] Optionally, in the above battery, 0.2mm≤h≤5mm.

[0013] Optionally, in the above battery, the battery connecting piece is an integrated structural part.

[0014] Optionally, in the above battery, the thickness t1 of the first connecting portion is 0.1 mm ≤ t1 ≤ 3 mm;

[0015] and / or, the thickness t2 of the second connecting portion, 0.1 mm ≤ t2 ≤ 3 mm;

[0016] And / or, the thickness of the elastic portion is t3, 0.1 mm≤t3≤3 mm.

[0017] Optionally, in the above battery, the elastic portion includes a plurality of stacked sheet-like members, each of the sheet-like members has a thickness T1, and 0.05 mm ≤ T1 ≤ 0.5 mm.

[0018] Optionally, in the above battery, it also includes a winding core and a shell;

[0019] The winding core is located in the housing, the first current collecting disk is located between the winding core and the pole, and the first current collecting disk is connected to the winding core;

[0020] A first battery connecting piece is arranged between the pole and the first current collecting plate. The first battery connecting piece is the above-mentioned battery connecting piece. The first connecting portion of the first battery connecting piece is connected to the pole, and the second connecting portion of the first battery connecting piece is connected to the first current collecting plate. The first current collecting plate is the electrical connector.

[0021] Optionally, in the above battery, it further includes an end cover and a second current collecting disk, wherein the second current collecting disk is disposed between the winding core and the end cover, and the second current collecting disk is connected to the winding core;

[0022] A second battery connecting piece is provided between the second current collecting plate and the end cover, and the second battery connecting piece includes a first connecting portion, a second connecting portion of an annular structure, and an elastic portion; wherein:

[0023] The first connection portion of the second battery connecting piece is connected to the second current collecting plate, and the second connection portion of the second battery connecting piece is welded to the housing or the end cover;

[0024] Alternatively, the first connection portion is connected to the end cover, and the second connection portion is connected to the second current collecting plate;

[0025] Alternatively, along the axial direction, the projection of the battery connecting piece overlaps with the projection of the shell, the second connecting portion is connected to the end cover and the shell, and the first connecting portion is connected to the second current collecting plate.

[0026] Optionally, in the above battery, the minimum value among the current-carrying area of ​​the first connecting portion, the current-carrying area of ​​the second connecting portion, and the current-carrying area of ​​the elastic portion is S,

[0027]

[0028] Wherein, Q is the rated capacity of the battery, in Ah; C is the charge and discharge rate, in c; β is the safety factor; K is the current carrying capacity per unit area of ​​the material used, in A / mm 2 .

[0029] Optionally, in the above battery, the effective welding area between the first connecting portion and the pole is S1;

[0030] The effective welding area between the second connection portion and the first current collecting plate is S2,

[0031]

[0032] Q is the rated capacity of the battery, in Ah; C is the charge and discharge rate, in c; α is the welding safety factor; K is the current carrying capacity per unit area of ​​the material used, in A / mm 2 .

[0033] Optionally, in the above battery, the effective welding area between the first connecting portion and the end cover is S3;

[0034] The effective welding area between the second connecting portion and the second current collecting plate is S4,

[0035]

[0036] Q is the rated capacity of the battery, in Ah; C is the charge and discharge rate, in c; α is the welding safety factor; K is the current carrying capacity per unit area of ​​the material used, in A / mm 2 .

[0037] Optionally, in the above battery, the pole includes a first column region, a second column region and a third column region connected in sequence from outside to inside along the axial direction, the diameter of the first column region is smaller than the diameters of the second column region and the third column region, the diameter of the second column region is larger than the diameter of the third column region, and the end surface between the second column region and the third column region is a step surface;

[0038] The third column area passes through the second through hole of the first connecting portion, the central axis of the pole coincides with the central axis of the battery connecting piece, and the end surface of the first connecting portion away from the winding core is connected to the step surface.

[0039] Optionally, in the above battery, the thickness of the first connecting portion is greater than the height of the third column region.

[0040] Optionally, in the above battery, a winding core and an end cover and a battery connecting sheet arranged between the winding core and the end cover are included.

[0041] The battery connecting piece comprises a first connecting portion, a second connecting portion of an annular structure, and an elastic portion, wherein:

[0042] The second connection portion is arranged radially outside the first connection portion and connected to the first connection portion through the elastic portion;

[0043] The axial gap between the first connecting portion and the second connecting portion is h, where h>0;

[0044] The first connection portion is connected to the winding core by welding, the area of ​​the first connection portion is S5, and the end surface area of ​​the connecting end of the winding core and the second connection portion is S6.

[0045]

[0046] The effective welding area between the first connection part and the winding core is S7,

[0047]

[0048] Q is the rated capacity of the battery, in Ah; C is the charge and discharge rate, in c; α is the welding safety factor; K is the current carrying capacity per unit area of ​​the material used, in A / mm2.

[0049] It can be seen from the above technical solution that the battery connector provided by the utility model is connected to two or more different parts through the first connecting part and the second connecting part respectively, and the axial gap between the first connecting part and the second connecting part is greater than 0, that is, there is a height difference between the two along the axial direction. An elastic part is arranged between the two, which can provide axial deformation space for the parts connected by the first connecting part and the second connecting part, and can improve the safety of the structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0050] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0051] Figure 1 A schematic diagram of the structure of a battery connecting piece provided in an embodiment of the utility model;

[0052] Figure 2 The structure of the battery provided by the embodiment of the utility model is shown in FIG. Figure 1 ;

[0053] Figure 3 The structure of the battery provided by the embodiment of the utility model is shown in FIG. Figure 2 ;

[0054] Figure 4 A cross-sectional view of a battery cell provided in an embodiment of the utility model;

[0055] Figure 5 A schematic diagram of the structure of the pole end of a battery provided by an embodiment of the utility model;

[0056] Figure 6 The cross section of the non-pole end of the battery provided by the embodiment of the utility model Figure 1 ;

[0057] Figure 7 A schematic diagram of the structure of the non-pole end of the battery provided by the embodiment of the utility model Figure 1 ;

[0058] Figure 8 The cross section of the non-pole end of the battery provided by the embodiment of the utility model Figure 2 ;

[0059] Fig. 9 A schematic diagram of the structure of the non-pole end of the battery provided by the embodiment of the utility model Figure 2 ;

[0060] Fig.10 A front view of a battery provided in accordance with an embodiment of the present utility model.

[0061] in:

[0062] 1-first connecting portion, 11-second through hole,

[0063] 2- Second connection part,

[0064] 3-elastic part, 31-first through hole,

[0065] 4- First collector plate,

[0066] 5-pole, 51-first column area, 52-second column area, 53-third column area,

[0067] 6-winding core, 7-housing, 8-end cover, 9-second collecting plate. DETAILED DESCRIPTION

[0068] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0069] In the description of the utility model, it should be noted that the terms "center", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, or the positions or positional relationships in which the utility model product is usually placed when in use, and are only for the convenience of describing the utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the utility model. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0070] like Figures 1 to 10 As shown, an embodiment of the utility model provides a battery connecting piece.

[0071] First, the battery connecting piece is arranged between the pole 5 and the first current collecting plate 4, and / or, between the end cover 8 and the second current collecting plate 9; the battery connecting piece includes a first connecting part 1, a second connecting part 2 of an annular structure, and an elastic part 3, wherein: the second connecting part 2 is arranged on the radial outer side of the first connecting part 1 and is connected to the first connecting part 1 through the elastic part 3; the axial gap between the first connecting part 1 and the second connecting part 2 is h, h>0. That is, by setting the elastic part 3, the relative movement of the first connecting part 1 and the second connecting part 2 along the axial direction can be achieved. It should be noted that the elastic part 3 can effectively release the stress of the battery connecting piece. Due to the manufacturing accuracy of each component, the forced assembly of the winding core 6 and the strong action between the components connected thereto cause the stress of the components in the battery to be unable to be released, resulting in stress concentration. The structure avoids damage to the components of the battery caused by stress concentration through the elastic deformation of the elastic part 3, and can improve the yield rate of the battery.

[0072] The utility model provides a battery, comprising the battery connecting piece mentioned above.

[0073] In a specific implementation, the first connection part 1 or the second connection part 2 is welded to the electrical connector inside the battery, and along the radial side of the second connection part, the ratio of the dimension a of the elastic part to the dimension b of the first connection part or the second connection part is 0.1≤a / b≤1. When the dimension ratio is within this range, the connecting piece can have an elastic deformation while not affecting the deformation, and the overcurrent requirement after welding the connecting piece to the electrical connector inside the battery can be guaranteed.

[0074] It can be seen that the battery connector provided by the embodiment of the utility model is connected to two or more different parts through the first connecting part 1 and the second connecting part 2, and the axial gap between the first connecting part 1 and the second connecting part 2 is greater than 0, that is, there is a height difference between the two along the axial direction. The elastic part 3 is arranged between the two, which can provide axial deformation space for the parts connected by the first connecting part 1 and the second connecting part 2, and can improve the safety of the structure.

[0075] In specific implementation, multiple elastic parts 3 are arranged along the circumference of the first connecting part 1, which can meet the overcurrent requirements under high-rate charge and discharge conditions. The overcurrent area can be adjusted by changing the number of elastic parts 3 and the plane size and thickness of the elastic parts 3, so that the battery connecting piece meets the overcurrent requirements; a first through hole 31 is arranged between adjacent elastic parts 3, and the corner of the first through hole 31 is chamfered. It should be noted that the projection of a single elastic part 3 along the axial direction can be rectangular or trapezoidal; the shape of the first through hole 31 can be circular, elliptical, or fan-shaped, but is not limited thereto. The shape of the first hole and the shape of the elastic part 3 can be specifically designed by those skilled in the art according to actual needs.

[0076] When implementing it, Figure 2-3 and Figure 6 , Figure 8 , the cross section of the elastic part 3 along the axial direction is at least partially shaped as a curved cross section, and the highest point and the lowest point are both within the gap range of the first connecting part 1 and the second connecting part 2 along the axial direction. At least part of the cross section of the elastic part 3 is curved to avoid interference or excessive pressure on the components connected to it. It should be noted that the curved cross section can have one convex point and / or one concave point, or multiple points, but is not limited to this. The cross section of the elastic part 3 along the radial direction can also be a straight line, and those skilled in the art can make specific designs according to actual needs.

[0077] In specific implementation, 0.2mm≤h≤5mm. It can meet the axial movement requirements of the battery cell. According to different types of batteries, it is generally slightly larger than 1 / 2 of the height tolerance range of the battery cell. Too large will reduce the battery energy density.

[0078] In specific implementation, the battery connector is an integrated structural member. However, it is not limited thereto, and can also be a structural member formed by partially or completely connecting separate parts by welding or other methods. Those skilled in the art can make specific designs according to actual needs.

[0079] In specific implementation, the thickness t1 of the first connection part 1 is 0.1mm≤t1≤3mm; and / or, the thickness t2 of the second connection part 2 is 0.1mm≤t2≤3mm; and / or, the thickness of the elastic part 3 is t3, 0.1mm≤t3≤3mm. It should be noted that the elastic part 3 is thinner, smaller in width or more plastic in material relative to the first connection part 1 and the second connection part 2 to achieve the reciprocating rotation of the elastic part 3 in response to the air pressure change when the battery is used. The first connection part 1, the second connection part 2 and the elastic part 3 can be made of the same material. Preferably, the first connection part 1 and the second connection and the correspondingly connected battery cell pole ear are made of the same metal material. In addition, the elastic part 3, the first connection part 1, and the second connection part 2 all adopt a single-layer structure. However, it is not limited to this, and those skilled in the art can make specific designs according to actual needs.

[0080] In specific implementation, the elastic part 3 includes a plurality of sheet-like components stacked in layers, and the thickness of each sheet-like component is T1, 0.05mm≤T1≤0.5mm. The elastic part 3, the first connecting part 1, and the second connecting part 2 all use a plurality of sheet-like components stacked in layers, and the welding positions of the three are at the junction of the elastic part 3 and the first connecting part 1 and the connection junction of the elastic part 3 and the second connecting part 2; or, the elastic part 3 is a plurality of sheet-like components stacked in layers, and the first connecting part 1 and the second connecting part 2 both use a single-layer structure, and the welding positions of the three are at the junction of the elastic part 3 and the first connecting part 1 and the connection junction of the elastic part 3 and the second connecting part 2. The welding form of the three welding positions is molecular diffusion welding but is not limited thereto, and the welding form can be specifically designed by those skilled in the art according to actual needs.

[0081] The utility model embodiment provides a battery, see Figure 5 , including a first current collecting disk 4, a pole 5, a winding core 6, and a shell 7; the winding core 6 is located in the shell 7, the first current collecting disk 4 is located between the winding core 6 and the pole 5, and the first current collecting disk 4 is connected to the winding core 6; a first battery connecting piece is provided between the pole 5 and the first current collecting disk 4, the first battery connecting piece is the above-mentioned battery connecting piece, the first connecting portion 1 of the first battery connecting piece is connected to the pole 5, the second connecting portion 2 of the first battery connecting piece is connected to the first current collecting disk 4, and the first current collecting disk 4 is the above-mentioned electrical connector. It should be noted that the connection between the first connecting portion 1 and the pole 5, and the connection between the second connecting portion 2 and the first current collecting disk 4 specifically refer to contact connection in some areas and welding in some areas.

[0082] It can be seen that the battery connecting piece in the battery provided by the embodiment of the utility model is connected to the pole 5 through the first connecting part 1, and the second connecting part 2 is connected to the first current collecting plate 4, and the axial gap between the first connecting part 1 and the second connecting part 2 is greater than 0, that is, there is a height difference between the two along the axial direction. The elastic part 3 is arranged between the two, which can provide axial deformation space for the pole 5 and the first current collecting plate 4, and can improve the safety of the battery structure.

[0083] In a specific implementation, it also includes an end cover 8 and a second current collecting plate 9, the second current collecting plate 9 is arranged between one end of the winding core 6 away from the pole 5 and the end cover 8, and the second current collecting plate 9 is connected to the winding core 6; a second battery connecting piece is arranged between the second current collecting plate 9 and the end cover 8, the second battery connecting piece is the above-mentioned battery connecting piece, and the central axis of the second current collecting plate 9, the central axis of the second battery connecting piece and the central axis of the end cover 8 coincide; wherein: see for details Figure 6 , Figure 7 , the first connection portion 1 of the second battery connecting piece is connected to the second current collecting disk 9, and the second connection portion 2 of the second battery connecting piece is welded to the shell 7 or the end cover 8 (that is, the end surface of the end cover 8 close to the winding core 6 is the inner surface of the end cover 8, the end surface of the first connection portion 1 of the second battery connecting piece close to the winding core 6 is in close contact with and welded to the end surface of the second current collecting disk 9 away from the winding core 6, and the end surface of the second connection portion 2 away from the winding core 6 is in close contact with and welded to the inner surface of the end cover 8); or, see Figure 8 , Fig. 9 , the first connection part 1 is connected to the end cover 8, and the second connection part 2 is connected to the second current collecting disk 9 (that is, the side of the first connection part 1 of the second battery connecting piece facing away from the winding core 6 is in close contact with the inner surface of the end cover 8 and welded, and the end surface of the second connection part 2 close to the winding core 6 is in close contact with the end surface of the second current collecting disk 9 facing away from the winding core 6 and welded); or, in the axial direction, the projection of the battery connecting piece overlaps with the projection of the shell 7, the second connection part 2 is connected to the end cover 8 and the shell 7, and the first connection part 1 is connected to the second current collecting disk 9. The second current collecting disk 9 is connected to the end cover 8 and / or the shell 7 through the first connection part 1 and the second connection part 2 of the connecting piece, respectively, and the axial gap between the first connection part 1 and the second connection part 2 is greater than 0, that is, there is a height difference between the two in the axial direction. An elastic part 3 is arranged between the two, which can provide space for axial deformation of the second current collecting disk 9 and the end cover 8, and can improve the safety of the battery structure. It should be noted that the connection between the first connection portion 1 and the second current collecting plate 9 or the end cover 8, and the connection between the second connection portion 2 and the second current collecting plate 9 or the end cover 8 specifically refer to partial area contact connection and partial area welding.

[0084] In a specific implementation, the minimum value among the current-carrying area of ​​the first connection portion 1, the current-carrying area of ​​the second connection portion 2, and the current-carrying area of ​​the elastic portion 3 is S.

[0085]

[0086] Among them, Q is the rated capacity of the battery, in Ah; C is the charge and discharge rate, in c; β is the safety factor; K is the current carrying capacity per unit area of ​​the material used, in A / mm 2 It should be noted that the central axis of the battery connecting piece coincides with the central axis of the current collecting plate, the end face of the second connecting portion 2 and the first connecting portion 1 are in close contact and welded connection with the end face of the current collecting plate and the battery cell, and the welding cross-sectional area meets the overcurrent requirement.

[0087] In a specific implementation, the effective welding area between the first connection portion 1 and the pole 5 is S1; the effective welding area between the second connection portion 2 and the first current collecting plate 4 is S2.

[0088]

[0089] Q is the rated capacity of the battery, in Ah; C is the charge and discharge rate, in c; α is the welding safety factor; K is the current carrying capacity per unit area of ​​the material used, in A / mm 2 It should be noted that the effective welding area is the cross-sectional area of ​​the component.

[0090] In a specific implementation, the area of ​​the end surface of the first connecting portion 1 facing away from the winding core 6 is S8, and S8>S1.

[0091] In a specific implementation, the effective welding area between the first connection part 1 and the end cover 8 is S3; the effective welding area between the second connection part 2 and the second current collecting plate 9 is S4.

[0092]

[0093] Q is the rated capacity of the battery, in Ah; C is the charge and discharge rate, in c; α is the welding safety factor; K is the current carrying capacity per unit area of ​​the material used, in A / mm 2 .

[0094] During specific implementation, S8>S3.

[0095] In specific implementation, the pole 5 includes the first column area 51, the second column area 52 and the third column area 53 connected in sequence from the outside to the inside along the axial direction. The diameter of the first column area 51 is smaller than the diameter of the second column area 52 and the third column area 53, the diameter of the second column area 52 is larger than the diameter of the third column area 53, and the end surface between the second column area 52 and the third column area 53 is a step surface; the third column area 53 passes through the second through hole 11 of the first connecting part 1, the central axis of the pole 5 coincides with the central axis of the battery connecting piece, and the end surface of the first connecting part 1 away from the winding core 6 is connected to the step surface. The end surface of the first column area 51 away from the third column area 53 is connected to the polarity terminal, the third column area 53 of the pole 5 passes through the first connecting part 1, the central axis of the pole 5 coincides with the central axis of the battery connecting piece, and the end surface of the first connecting part 1 away from the battery cell is attached and welded to the end surface of the second column area 52 connected to the third column area 53.

[0096] In specific implementation, the thickness of the first connecting portion 1 is greater than the height of the third column area 53. This ensures that after welding, the weld is lower than the step surface, reduces the axial height of the pole 5 and the battery connecting piece after assembly, and is beneficial to increasing the height of the battery cell.

[0097] In a specific implementation, it includes a winding core 6 and an end cover 8 and a battery connecting piece arranged between the winding core 6 and the end cover 8, and the battery connecting piece includes a first connecting portion 1, a second connecting portion 2 of an annular structure, and an elastic portion 3, wherein: the second connecting portion 2 is sleeved on the radial outer side of the first connecting portion 1 and is connected to the first connecting portion 1 through the elastic portion 3; the axial gap between the first connecting portion 1 and the second connecting portion 2 is h, h>0; the first connecting portion 1 is welded to the winding core 6, the area of ​​the first connecting portion 1 is S5, and the end surface area of ​​the connecting end of the winding core 6 and the second connecting portion 2 is S6,

[0098]

[0099] The effective welding area between the first connection part and the winding core is S7,

[0100]

[0101] Q is the rated capacity of the battery, in Ah; C is the charge and discharge rate, in c; α is the welding safety factor; K is the current carrying capacity per unit area of ​​the material used, in A / mm2.

[0102] It can be seen that the battery provided by the embodiment of the utility model is connected to the core 6 and the end cover 8 through the first connecting part 1 and the second connecting part 2 respectively, and the first connecting part 1 is welded to the core 6. The area of ​​the first connecting part 1 is S5, and the end surface area of ​​the connecting end of the core 6 and the second connecting part 2 is S6. 0.6≤S5 / S6≤1, and the effective welding area of ​​the first connecting part and the core is S7.

[0103] The connection part is ensured to have a large connection area, which can meet the flow capacity of the battery and make the connection between the structures more secure. In addition, the axial gap between the first connection part 1 and the second connection part 2 is greater than 0, that is, there is a height difference between the two along the axial direction. The elastic part 3 is arranged between the two, which can provide axial deformation space for the end cover 8 and the winding core 6, and can improve the safety of the structure.

[0104] Finally, it should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.

[0105] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0106] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A battery, comprising a battery connecting sheet, characterized in that: The battery connecting piece is arranged between the pole (5) and the first current collecting plate (4), and / or the battery connecting piece is arranged between the end cover (8) and the second current collecting plate (9); The battery connecting piece comprises a first connecting portion (1), a second connecting portion (2) of an annular structure, and an elastic portion (3), wherein: The second connecting portion is arranged radially outside the first connecting portion (1) and is connected to the first connecting portion (1) via the elastic portion (3); An axial gap between the first connecting portion (1) and the second connecting portion (2) is h, where h>0; The first connecting part (1) or the second connecting part (2) is welded to the electrical connector, and along one radial side of the second connecting part, the ratio of the dimension a of the elastic part to the dimension b of the first connecting part or the second connecting part is 0.1≤a / b≤1.

2. The battery according to claim 1, characterized in that: A plurality of the elastic parts (3) are arranged along the circumference of the first connecting part (1), and a first through hole (31) is arranged between adjacent elastic parts (3), and the corner of the first through hole (31) is chamfered.

3. The battery according to claim 1, characterized in that: At least part of the cross-section of the elastic portion (3) along the axial direction is curved, and the highest point and the lowest point of the cross-section are both within the gap between the first connecting portion (1) and the second connecting portion (2) along the axial direction.

4. The battery according to claim 1, characterized in that: 0.2mm≤h≤5mm.

5. The battery according to claim 1, characterized in that: The battery connecting piece is an integrated structural part.

6. The battery according to claim 1, characterized in that: The thickness of the first connecting portion (1) is t1, 0.1 mm ≤ t1 ≤ 3 mm; and / or, the thickness of the second connecting portion (2) is t2, 0.1 mm ≤ t2 ≤ 3 mm; And / or, the thickness of the elastic portion (3) is t3, 0.1 mm ≤ t3 ≤ 3 mm.

7. The battery according to claim 6, characterized in that: The elastic part (3) comprises a plurality of sheet-like components stacked in layers, each of the sheet-like components having a thickness T1, 0.05 mm ≤ T1 ≤ 0.5 mm.

8. The battery according to any one of claims 1 to 7, characterized in that It also includes a winding core (6) and a shell (7); The winding core (6) is located in the shell (7), the first current collecting disk (4) is located between the winding core (6) and the pole (5), and the first current collecting disk (4) is connected to the winding core (6); A first battery connecting piece is provided between the pole (5) and the first current collecting plate (4); a first connecting portion (1) of the first battery connecting piece is connected to the pole (5); a second connecting portion (2) of the first battery connecting piece is connected to the first current collecting plate (4); the first current collecting plate (4) is the electrical connector.

9. The battery according to claim 8, characterized in that It also comprises an end cover (8) and a second current collecting plate (9), wherein the second current collecting plate (9) is arranged between one end of the winding core (6) away from the pole (5) and the end cover (8), and the second current collecting plate (9) is connected to the winding core (6); A second battery connecting piece is provided between the second current collecting plate (9) and the end cover (8), and the second battery connecting piece comprises a first connecting portion (1), a second connecting portion (2) of an annular structure, and an elastic portion (3); wherein: The first connection portion (1) of the second battery connection piece is connected to the second current collecting plate (9), and the second connection portion (2) of the second battery connection piece is welded to the housing (7) or the end cover (8); Alternatively, the first connection portion (1) is connected to the end cover (8), and the second connection portion (2) is connected to the second current collecting plate (9); Alternatively, along the axial direction, the projection of the battery connecting piece overlaps with the projection of the shell (7), the second connecting portion (2) is connected to the end cover (8) and the shell (7), and the first connecting portion (1) is connected to the second collecting plate (9).

10. The battery according to claim 8, characterized in that The minimum value of the current-carrying area of ​​the first connecting portion (1), the current-carrying area of ​​the second connecting portion (2), and the current-carrying area of ​​the elastic portion (3) is S, Wherein, Q is the rated capacity of the battery, in Ah; C is the charge and discharge rate, in c; β is the safety factor; K is the current carrying capacity per unit area of ​​the material used, in A / mm 2 .

11. The battery according to claim 8, characterized in that The effective welding area between the first connecting portion and the pole (5) is S1; The effective welding area between the second connecting portion and the first current collecting plate (4) is S2, Q is the rated capacity of the battery, in Ah; C is the charge and discharge rate, in c; α is the welding safety factor; K is the current carrying capacity per unit area of ​​the material used, in A / mm 2 .

12. The battery according to claim 9, characterized in that The effective welding area between the first connecting portion and the end cover (8) is S3; The effective welding area between the second connecting portion and the second current collecting plate (9) is S4, Q is the rated capacity of the battery, in Ah; C is the charge and discharge rate, in c; α is the welding safety factor; K is the current carrying capacity per unit area of ​​the material used, in A / mm 2 .

13. The battery according to claim 8, characterized in that: The pole (5) comprises, in order from outside to inside along the axial direction, a first pole region (51), a second pole region (52) and a third pole region (53) which are connected to each other; the diameter of the first pole region (51) is smaller than the diameters of the second pole region (52) and the third pole region (53); the diameter of the second pole region (52) is larger than the diameter of the third pole region (53); and the end surface between the second pole region (52) and the third pole region (53) is a step surface; The third column area (53) passes through the second through hole (11) of the first connecting portion (1), the central axis of the pole (5) coincides with the central axis of the battery connecting piece, and the end surface of the first connecting portion (1) away from the winding core (6) is connected to the step surface.

14. The battery according to claim 13, characterized in that The thickness of the first connecting portion (1) is greater than the height of the third column region (53).

15. The battery according to any one of claims 1 to 7, characterized in that It comprises a winding core (6), an end cover and the battery connecting piece arranged between the winding core (6) and the end cover, The first connection portion (1) is connected to the winding core (6) by welding, the area of ​​the first connection portion (1) is S5, and the end surface area of ​​the connecting end of the winding core (6) and the second connection portion (2) is S6. 0.6≤S5 / S6≤1 The effective welding area between the first connecting portion (1) and the winding core (6) is S7, Q is the rated capacity of the battery, in Ah; C is the charge and discharge rate, in c; α is the welding safety factor; K is the current carrying capacity per unit area of ​​the material used, in A / mm 2 .

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