Connecting piece, battery cell, battery pack and vehicle

Abstract

The utility model provides a connecting piece, a battery cell, a battery pack and a vehicle, the connecting piece comprises a first connecting part, a second connecting part and a telescopic part, the first connecting part is used for connecting a pole, the second connecting part and the first connecting part are arranged at an interval along a first direction, and the second connecting part is used for connecting a tab; the telescopic part is connected with the first connecting part and the second connecting part and can stretch out and draw back in the first direction. According to the connecting piece provided by the embodiment of the invention, the distance from one end, far away from the first connecting part, of the second connecting part to the central point of the first connecting part can be adjusted to be within the preset range by folding or unfolding the telescopic part, so that the second connecting part can reliably support the tab; the tab damage caused by pulling the tab by the second connecting part is prevented, the applicability of the connecting piece is improved, and the reliability of the battery cell is improved; moreover, the production and processing difficulty of the connecting sheet can be reduced, the production efficiency is improved, and the production cost is reduced.

Description

Technical Field

[0001] The present disclosure relates to the field of batteries, and in particular to a connecting sheet, a battery cell, a battery pack and a vehicle. Background Art

[0002] The battery cell includes a shell, a battery cell body, a cover plate assembly and a connecting piece. The shell defines a receiving cavity with an opening. The battery cell body is arranged in the receiving cavity, and the battery cell body includes two winding cores, which are arranged opposite to each other along the width direction of the battery cell; each winding core includes a winding core body and a pole ear, and the pole ears of the two winding cores are arranged opposite to each other and spaced along the width direction of the battery cell. The pole ear includes a bending portion and a connecting portion, and the bending portion extends along the height direction of the battery cell; and the bending portion is connected to the winding core body, and the connecting portion extends along the width direction of the battery cell, and one end of the connecting portion is connected to an end of the bending portion away from the winding core body. The connecting piece is arranged between the two bending portions, and the connecting piece is connected to the corresponding two connecting portions. The cover plate assembly includes a cover body and a pole, and the cover body is sealed at the opening of the receiving cavity. The pole is passed through the cover body, and the pole is connected to the connecting piece.

[0003] When assembling the battery cells, it is necessary to first spread the two winding cores flat along the width direction of the battery cells, spread the pole ears of the two winding cores flat and set them close to each other, weld the connecting piece and the pole ear together, and then translate the welded initial structural parts to the cover assembly, weld the pole column and the connecting piece, and then fold the pole ear along the bending line of the pole ear, fold the bent part to the vertical connecting part, fold the two winding core bodies to be parallel to the height direction of the battery cells, and then place the folded secondary structural parts as a whole into the accommodating cavity, and use the cover assembly to seal the opening of the accommodating cavity to complete the assembly of the battery cells.

[0004] In the related art, a connecting piece is provided with a bending portion between the pole lug connection portion and the pole column connection portion to improve the space utilization, and the dimensional accuracy of the connecting piece in the width direction of the battery cell needs to be ensured. When installed in a battery cell assembly, if the connecting piece is large in the width direction of the battery cell, the bending line between the connecting piece and the pole lug will be close, causing the connecting piece to pull the pole lug, or causing the connecting piece to scratch the pole lug. Therefore, a higher dimensional accuracy requirement is imposed on the connecting piece. However, the higher dimensional accuracy requirement leads to a greater difficulty in the production process of the connecting piece, and ultimately leads to a higher production cost of the connecting piece. Utility Model Content

[0005] In order to solve the above technical problems or at least partially solve the above technical problems, the present disclosure provides a connecting sheet, a battery cell, a battery pack and a vehicle.

[0006] The present application discloses a connecting piece, comprising: a first connecting portion; a second connecting portion, which is arranged at intervals with the first connecting portion along a first direction; and a telescopic portion, which connects the first connecting portion and the second connecting portion, and is used to adjust the distance between its two ends in the first direction.

[0007] Optionally, there are two second connection parts, which are respectively arranged on two sides of the first connection part in the first direction.

[0008] Optionally, there is one second connecting portion, which includes a connecting section and a transition section. There are two transition sections, which are respectively connected to the two ends of the connecting section in the second direction. In the first direction, one end of the telescopic portion is connected to the connecting section, and the other end is connected to the first connecting portion; wherein the first direction is perpendicular to the second direction.

[0009] Optionally, the telescopic portion includes a folding section, which defines a folding space with an opening. The folding section can be symmetrically folded, and the symmetry axis of the folding section is parallel to a second direction. In the first direction, one end of the folding section is connected to the first connecting portion, and the other end is connected to the second connecting portion; wherein the first direction is perpendicular to the second direction.

[0010] Optionally, the telescopic portion also includes a first straight section and a second straight section, and the first straight section and the second straight section both extend along the second direction; one end of the first straight section is connected to an end of the folding section close to the first connecting portion, and the other end of the first straight section is connected to the first connecting portion; one end of the second straight section is connected to an end of the folding section close to the second connecting portion, and the other end of the second straight section is connected to the second connecting portion.

[0011] Optionally, a length of the first straight section in the second direction is not equal to a length of the second straight section in the second direction.

[0012] Optionally, there are multiple symmetrical folding segments, and the multiple symmetrical folding segments are arranged in sequence along the first direction, and the end of each folding segment close to the first connecting portion is a first end, and the end of each folding segment away from the first connecting portion is a second end; the first end of one of two adjacent folding segments is connected to the second end of the other one.

[0013] Optionally, a pre-folding indentation is provided on the folding section, and in the first direction, parts of the folding section located on both sides of the pre-folding indentation are symmetrical along the second direction.

[0014] The present application also discloses a battery cell, comprising: a shell, the shell defining a accommodating cavity with an opening; a battery cell body, the battery cell body being disposed in the accommodating cavity and having pole ears that are opposite and spaced apart along a first direction; a cover plate assembly, the cover plate assembly covering the opening of the accommodating cavity and having poles; and a connecting sheet provided according to the above disclosure.

[0015] The present application also discloses a battery pack, comprising: a battery cell provided according to the above disclosure.

[0016] The present application also discloses a vehicle, comprising: a battery pack provided according to the above disclosure.

[0017] Compared with the prior art, the technical solution provided by the embodiments of the present disclosure has the following advantages:

[0018] According to the connecting piece provided by the embodiment of the present disclosure, a telescopic portion foldable in the first direction is connected between the first connecting portion and the second connecting portion. When the size of the connecting piece in the first direction is too large or too small, the distance between the two ends of the telescopic portion in the first direction is changed by compressing or stretching the telescopic portion, so that the connecting piece can be suitable for use requirements of various sizes; moreover, in this way, the requirements for dimensional accuracy of the connecting piece will not be too high, the difficulty of producing and processing the connecting piece will be reduced, the production efficiency will be improved, and the production cost will be reduced.

[0019] According to the battery cell provided by the embodiment of the present disclosure, by setting the above-mentioned connecting piece, the size of the connecting piece in the first direction can be adjusted by folding or unfolding the telescopic part, and the size of the connecting piece in the first direction can be adjusted to match the pole ear, so that the second connecting part can reliably support the pole ear and prevent the second connecting part from pulling the pole ear and causing damage to the pole ear, thereby improving the reliability of the battery cell and reducing the production cost of the battery cell.

[0020] According to the battery pack provided in the embodiment of the present disclosure, by providing the above-mentioned battery cells, the reliability of the battery cells can be improved and the production cost of the battery cells can be reduced.

[0021] According to the vehicle provided by the embodiment of the present disclosure, by providing the above-mentioned battery pack, the reliability of the battery pack can be improved, the production cost of the battery pack can be reduced, and the cost of the entire vehicle can be reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present disclosure and, together with the description, serve to explain the principles of the present disclosure.

[0023] In order to more clearly illustrate the embodiments of the present invention 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, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0024] Figure 1 A three-dimensional diagram of a battery cell according to some embodiments of the present disclosure;

[0025] Figure 2 for Figure 1 An exploded view of the battery cell in the figure;

[0026] Figure 3 for Figure 1 A cross-sectional view of a battery cell in FIG.

[0027] Figure 4 for Figure 2 A cross-sectional view of a partial structure of a connecting piece in FIG.

[0028] Figure 5 Schematic diagram of a partial structure of a connecting sheet of some other embodiments provided by the present disclosure;

[0029] Figure 6 Schematic diagram of a partial structure of a connecting sheet of some other embodiments provided by the present disclosure;

[0030] Figure 7 Schematic diagram of a partial structure of a connecting sheet of some other embodiments provided by the present disclosure;

[0031] Figure 8 Schematic diagram of a partial structure of a connecting sheet of some other embodiments provided by the present disclosure;

[0032] Fig. 9 Schematic diagram of a partial structure of a connecting sheet of some other embodiments provided by the present disclosure;

[0033] Fig.10 Schematic diagram of a partial structure of a connecting sheet of some other embodiments provided by the present disclosure;

[0034] Fig.11 A stereoscopic view of connecting sheets according to other embodiments of the present disclosure.

[0035] Among them, 100, battery cells;

[0036] 10. housing; 11. accommodating chamber;

[0037] 20. battery cell body; 2. winding core; 21. winding core body; 22. pole ear; 221. bending part; 222. connecting part;

[0038] 30. Cover plate assembly; 31. Cover body; 32. Pole;

[0039] 40. Connecting piece; 41. First connecting part; 42. Second connecting part; 421. Supporting section; 422. Folding section; 423. Rounded corners; 424. Chamfered right angles; 425. Connecting section; 426. Transfer section; 43. Telescopic section; 431. Folding section. DETAILED DESCRIPTION

[0040] In order to more clearly understand the above-mentioned objectives, features and advantages of the present disclosure, the scheme of the present disclosure will be further described below. It should be noted that the embodiments of the present disclosure and the features in the embodiments can be combined with each other without conflict.

[0041] In the following description, many specific details are set forth to facilitate a full understanding of the present disclosure, but the present disclosure may also be implemented in other ways different from those described herein; it is obvious that the embodiments in the specification are only part of the embodiments of the present disclosure, rather than all of the embodiments.

[0042] Reference Figure 1-Figure 3 The battery cell 100 includes a shell 10, a battery cell body 20, a cover plate assembly 30 and a connecting piece 40. The shell 10 defines a accommodating cavity 11 with an opening. The battery cell body 20 is disposed in the accommodating cavity 11, and the battery cell body 20 includes two winding cores 2. The two winding cores 2 are arranged opposite to each other along the width direction of the battery cell 100; each winding core 2 includes a winding core body 21 and a pole ear 22. The pole ears 22 of the two winding cores 2 are arranged opposite to each other and spaced apart along the width direction of the battery cell 100.

[0043] The pole ear 22 includes a bending portion 221 and a connecting portion 222, the bending portion 221 extends along the height direction of the battery cell 100; and the bending portion 221 is connected to the core body 21, the connecting portion 222 extends along the width direction of the battery cell 100, and one end of the connecting portion 222 is connected to the end of the bending portion 221 away from the core body 21.

[0044] The connecting piece 40 is arranged between the two bending portions 221, and the connecting piece 40 is connected to the corresponding two connecting portions 222. The cover plate assembly 30 includes a cover body 31 and a pole 32. The cover body 31 seals the opening of the accommodating cavity 11, the pole 32 is passed through the cover body 31, and the pole 32 is connected to the connecting piece 40.

[0045] When assembling the battery cell 100, the two winding cores 2 can be first spread out along the width direction of the battery cell 100, the pole ears 22 of the two winding cores 2 can be arranged close to each other, the connecting piece 40 and the pole ear 22 can be welded together, and then the welded initial structural member can be translated to the cover plate assembly 30, the pole column 32 and the connecting piece 40 can be welded, and then the pole ear 22 can be folded along the bending line of the pole ear 22, and the bending portion 221 can be folded to the vertical connecting portion 222, and the two winding core bodies 21 can be folded to be parallel to the height direction of the battery cell 100, and then the folded secondary structural member can be placed as a whole in the accommodating cavity 11, and the opening of the accommodating cavity 11 can be sealed with the cover plate assembly 30 to complete the assembly of the battery cell 100.

[0046] It should be explained that the bending line of the tab 22 refers to the boundary line between the bending portion 221 and the connecting portion 222 ; during the production process of the battery cell body 20 , the bending portion 221 and the connecting portion 222 of the tab 22 are sheet structures in a flat state.

[0047] The connecting piece 40 may be connected to the side surface of the corresponding two connecting parts 222 facing the core body 21, and the connecting piece 40 may also be connected to the side surface of the corresponding two connecting parts 222 facing the cover plate assembly 30. The connecting piece 40 provided by the present disclosure is described below by taking some embodiments of "the connecting piece 40 is connected to the side surface of the corresponding two connecting parts 222 facing the core body 21" as an example.

[0048] Reference Figure 3 and Figure 4 , the present application discloses a connecting piece 40, including a first connecting portion 41, a second connecting portion 42 and a telescopic portion 43, for example, the first connecting portion 41 is used to connect the pole 32, for example, the first connecting portion 41 and the pole 32 can be connected together by a welding process;

[0049] The second connection part 42 and the first connection part 41 are arranged at intervals along the first direction. For example, the second connection part 42 is used to connect the pole ear 22. For example, the connection part 42 and the pole ear 22 can be connected together by welding. The telescopic part 43 connects the first connection part 41 and the second connection part 42. The telescopic part 43 is used to adjust the distance between its two ends in the first direction. For example, the telescopic part 43 can be telescopic in the first direction. For example, when the connecting sheet 40 is arranged in the battery cell 100, the first direction can be the width direction of the battery cell 100; the first direction can also be the length direction of the battery cell 100.

[0050] Reference Figure 2-Figure 4 There may be two second connection parts 42, and the two second connection parts 42 are respectively disposed on both sides of the first connection part 41 in the first direction. For example, when the connection sheet 40 is disposed in the battery cell 100, the first direction is the width direction of the battery cell 100.

[0051] When the interval between the bending portions 221 of the two pole ears 22 is large, the telescopic portion 43 can be stretched to increase the distance between the two ends of the telescopic portion 43 in the first direction, and increase the distance from the end of the second connecting portion 42 away from the first connecting portion 41 to the center point of the first connecting portion 41, so that the second connecting portion 42 is adapted to the connecting portion 222 of the pole ear 22.

[0052] When the interval between the bending portions 221 of the two pole ears 22 is small, the telescopic portion 43 can be compressed inwardly to reduce the distance between the two ends of the telescopic portion 43 in the first direction, and reduce the distance from the end of the second connecting portion 42 away from the first connecting portion 41 to the center point of the first connecting portion 41, so that the second connecting portion 42 is adapted to the connecting portion 222 of the pole ear 22.

[0053] By compressing or stretching the telescopic part 43, the distance between the two ends of the telescopic part 43 in the first direction can be changed, and the distance from the end of the second connecting part 42 away from the first connecting part 41 to the center point of the first connecting part 41 can be changed, so that the connecting sheet 40 can adapt to the battery cells 100 with different spacing between the pole ears 22, thereby improving the applicability of the connecting part 222.

[0054] When the spacing distance between the two pole tabs 22 is determined or the spacing between the pole tab 22 and the pole column 32 is determined, when the connecting piece 40 is smaller in the first direction, the distance between the two ends of the telescopic portion 43 in the first direction is increased by stretching the telescopic portion 43, and the distance from the end of the second connecting portion 42 away from the first connecting portion 41 to the center point of the first connecting portion 41 is increased, so that the second connecting portion 42 can reliably support the pole tab 22, prevent the second connecting portion 42 from pulling the pole tab 22 and causing damage to the pole tab 22, and improve the reliability of the battery cell 100.

[0055] When the spacing distance between the two pole ears 22 is determined or the spacing between the pole ear 22 and the pole column 32 is determined, when the connecting piece 40 is larger in the first direction, the telescopic portion 43 is compressed to reduce the distance between the two ends of the telescopic portion 43 in the first direction, and the distance from the end of the second connection portion 42 away from the first connection portion 41 to the center point of the first connection portion 41 is reduced, thereby ensuring the spacing between the bending portion 221 of the pole ear 22 and the second connection portion 42 in the first direction, preventing the first connection portion 41 from interfering with the bending of the pole ear 22 and causing the pole ear 22 to be damaged or even broken, thereby improving the reliability of the battery cell 100.

[0056] By compressing or stretching the telescopic part 43, the distance between the two ends of the telescopic part 43 in the first direction can be changed, and the distance from the end of the second connection part 42 away from the first connection part 41 to the center point of the first connection part 41 can be changed. The distance from the end of the second connection part 42 away from the first connection part 41 to the center point of the first connection part 41 is adjusted to a preset range, so that the second connection part 42 can reliably support the pole ear 22 to prevent the second connection part 42 from pulling the pole ear 22 and causing damage to the pole ear 22, thereby improving the applicability of the connecting sheet 40 and improving the reliability of the battery cell 100.

[0057] Reference Fig.11 , the second connection part 42 is one, the second connection part 42 includes a connection section 425 and a transition section 426, the transition sections 426 are two, and the two transition sections 426 are respectively connected to the two ends of the connection section 425 in the second direction, in the first direction, one end of the telescopic part 43 is connected to the connection section 425, and the other end is connected to the first connection part 41; for example, the transition section 426 can be used to connect the pole ear 22; wherein the first direction is perpendicular to the second direction. For example, when the connecting sheet 40 is arranged in the battery cell 100, the first direction is the length direction of the battery cell 100, and the second direction is the width direction of the battery cell 100.

[0058] When the interval between the pole lug 22 and the pole post 32 in the first direction is large, in order to reduce or avoid the risk of the pole lug 22 being stretched or broken, the telescopic portion 43 can be stretched to increase the distance between the two ends of the telescopic portion 43 in the first direction, and increase the distance from the end of the second connection portion 42 away from the first connection portion 41 to the center point of the first connection portion 41, so that the second connection portion 41 is adapted to the pole post 32, and the second connection portion 42 is adapted to the pole lug 22.

[0059] When the interval between the pole lug 22 and the pole post 32 in the first direction is small, in order to reduce or avoid the risk of the pole lug 22 being stretched or broken, the telescopic portion 43 can be compressed inwardly to reduce the distance between the two ends of the telescopic portion 43 in the first direction, and the distance from the end of the second connection portion 42 away from the first connection portion 41 to the center point of the first connection portion 41 can be reduced, so that the second connection portion 41 is adapted to the pole post 32, and the second connection portion 42 is adapted to the pole lug 22.

[0060] By compressing or stretching the telescopic part 43, the distance between the two ends of the telescopic part 43 in the first direction can be changed, and the distance from the end of the second connecting part 42 away from the first connecting part 41 to the center point of the first connecting part 41 can be changed, so that the connecting piece 40 can be adapted to the use requirements of various sizes, so that the connecting piece 40 can adapt to the battery cells 100 with different spacings between the pole ears 22 and the poles 32 in the first direction, thereby improving the applicability of the connecting part 222.

[0061] When the spacing distance between the pole lug 22 and the pole column 32 in the first direction is determined and the distance between the connecting piece 40 in the first direction is smaller, the telescopic portion 43 is stretched to increase the distance between the two ends of the telescopic portion 43 in the first direction, and the distance from the end of the second connecting portion 42 away from the first connecting portion 41 to the center point of the first connecting portion 41 is increased, so that the second connecting portion 42 can reliably support the pole lug 22, prevent the second connecting portion 42 from pulling the pole lug 22 and causing damage to the pole lug 22, and improve the reliability of the battery cell 100.

[0062] When the spacing distance between the pole lug 22 and the pole column 32 in the first direction is determined and the connecting piece 40 is larger in the first direction, the telescopic portion 43 is compressed to shorten the distance between the two ends of the telescopic portion 43 in the first direction, and the distance from the end of the second connecting portion 42 away from the first connecting portion 41 to the center point of the first connecting portion 41 is reduced, thereby ensuring the spacing between the bending portion 221 of the pole lug 22 and the second connecting portion 42 in the first direction, preventing the first connecting portion 41 from interfering with the bending of the pole lug 22 and causing the pole lug 22 to be damaged or even broken, thereby improving the reliability of the battery cell 100.

[0063] By compressing or stretching the telescopic part 43, the distance between the two ends of the telescopic part 43 in the first direction can be changed, and the distance from the end of the second connection part 42 away from the first connection part 41 to the center point of the first connection part 41 can be changed. The distance from the end of the second connection part 42 away from the first connection part 41 to the center point of the first connection part 41 is adjusted to a preset range, so that the second connection part 42 can reliably support the pole ear 22 to prevent the second connection part 42 from pulling the pole ear 22 and causing damage to the pole ear 22, thereby improving the applicability of the connecting sheet 40 and improving the reliability of the battery cell 100.

[0064] Moreover, by compressing or stretching the telescopic part 43, the distance between the two ends of the telescopic part 43 in the first direction can be changed, and the distance from the end of the second connecting part 42 away from the first connecting part 41 to the center point of the first connecting part 41 can be changed. In this way, the requirements for dimensional accuracy of the connecting piece 40 will not be too high, the difficulty of producing and processing the connecting piece 40 can be reduced, the production efficiency can be improved, and the production cost can be reduced.

[0065] For example, refer to Figure 5-Figure 10 The edge of the second connecting portion 42 is smoothed to prevent the second connecting portion 42 from scratching the tab 22, thereby improving the reliability of the tab 22. Figure 5 and Figure 6 The second connection portion 42 may be smoothed by folding a side surface of the second connection portion 42 facing the connection portion 222 , or the second connection portion 42 may be smoothed by chamfering a side surface of the second connection portion 42 facing the connection portion 222 .

[0066] Reference Figure 5When the second connection portion 42 is folded at the edge, the second connection portion 42 may include a support section 421 and a folded edge section 422. The support section 421 is welded to the connection portion 222 of the tab 22. The folded edge section 422 may be arranged perpendicularly or at an acute angle to the support section 421. This may simplify the folding process of the second connection portion 42, reduce production difficulty, improve production efficiency, and reduce production costs. Optionally, refer to Figure 6 The folding section 422 can be overlapped with the supporting section 421, which can reduce the size of the second connecting portion 42 on the second defense line, making the overall structure of the connecting piece 40 more compact.

[0067] Reference Figure 7 and Fig.10 When the second connection portion 42 is chamfered at the edge, the edge of the second connection portion 42 may be chamfered at a rounded angle 423 or at a right angle 424. Optionally, refer to Figure 8 and Fig.10 The second connecting portion 42 may also be processed by double-sided chamfering at the edge, so that the connecting piece 40 can be used on both sides, further improving the applicability of the connecting piece 40.

[0068] According to the connecting piece 40 provided in the embodiment of the present disclosure, a telescopic portion 43 that can be telescoped in the first direction is connected between the first connecting portion 41 and the second connecting portion 42. When the distance from the end of the second connecting portion 42 away from the first connecting portion 41 to the center point of the first connecting portion 41 is too large or too small, the telescopic portion 43 can be compressed or stretched to change the distance between the two ends of the telescopic portion 43 in the first direction, and the distance from the end of the second connecting portion 42 away from the first connecting portion 41 to the center point of the first connecting portion 41 is adjusted to a preset range, so that the second connecting portion 42 can reliably support the pole ear 22, prevent the second connecting portion 42 from pulling the pole ear 22 and causing damage to the pole ear 22, thereby improving the applicability of the connecting piece 40 and improving the reliability of the battery cell 100; moreover, in this way, the requirements for dimensional accuracy of the connecting piece 40 will not be too high, the difficulty of production and processing of the connecting piece 40 can be reduced, the production efficiency can be improved, and the production cost can be reduced.

[0069] Reference Figure 4 According to some embodiments provided by the present disclosure, the telescopic portion 43 includes a folding segment 431, and the folding segment 431 defines a folding space with an opening, so that a folding space can be provided for the folding segment 431 to achieve folding of the folding segment 431 in a first direction.

[0070] Two ends of the folding section 431 are connected to the first connecting portion 41 and the second connecting portion 42 respectively. The folding section 431 can be folded symmetrically, and the symmetry axis of the folding section 431 is parallel to the second direction; wherein the first direction is perpendicular to the second direction.

[0071] Reference Figure 4 , the folding section 431 is arc-shaped; optionally, the folding section 431 may also be V-shaped. For example, the folding section 431 is smoothly connected to the first connecting portion 41, and the folding section 431 is smoothly connected to the second connecting portion 42, so as to reduce the complexity of the production process of the connecting sheet 40 and reduce the production cost of the connecting sheet 40.

[0072] By symmetrically folding the folding section 431, the height difference between the two ends of the folding section 431 in the second direction is not changed when the folding section 431 is folded and unfolded, and the height difference between the two ends of the telescopic portion 43 in the second direction is not changed, so that the height difference between the first connecting portion 41 and the second connecting portion 42 in the second direction can be kept unchanged more reliably, thereby preventing the occurrence of cold welding between the first connecting portion 41 and the pole 32 or preventing the occurrence of cold welding between the second connecting portion 42 and the pole lug 22, so that the first connecting portion 41 and the pole 32 are welded reliably, and the second connecting portion 42 and the pole lug 22 are welded reliably, thereby improving the reliability of the connecting piece 40.

[0073] For example, the folding section 431 can be arranged on the side of the second connecting portion 42 close to the cover plate assembly 30, so that the folding section 431 can be prevented from interfering with the core body 21, so that the interval between the connecting portion 222 of the pole tab 22 and the core body 21 is arranged closer, so that the overall structure of the battery cell 100 is more compact, and the overall performance of the battery cell 100 is improved. Optionally, the gap between the connecting portion 222 of the pole tab 22 and the pole 32 can be used to accommodate the folding section 431, so that the overall structure of the battery cell 100 is more compact.

[0074] For example, the folding section 431 can be arranged on the side of the second connecting part 42 close to the core body 21, so as to prevent the folding section 431 from interfering with the cover plate assembly 30 and causing a cold weld between the first connecting part 41 and the pole 32, so that the first connecting part 41 and the pole 32 can be reliably fitted together, and the first connecting part 41 and the pole 32 can be reliably welded together, thereby improving the reliability of the battery cell 100.

[0075] According to some embodiments provided by the present disclosure, the telescopic portion 43 also includes a first straight section and a second straight section, both of which extend along the second direction; one end of the first straight section is connected to an end of the folding section 431 close to the first connecting portion 41, and the other end of the first straight section is connected to the first connecting portion 41; one end of the second straight section is connected to an end of the folding section 431 close to the second connecting portion 42, and the other end of the second straight section is connected to the second connecting portion 42.

[0076] By setting a first straight section to connect the folding section 431 and the first connecting part 41, and setting a second straight section to connect the folding section 431 and the second connecting part 42, the symmetrical telescopic part 43 can be folded or opened by squeezing the first straight section and the second straight section toward each other or away from each other, thereby facilitating the stretching and compression of the symmetrical telescopic part 43 and improving the convenience of adjusting the size of the connecting piece 40 in the first direction.

[0077] According to some embodiments provided by the present disclosure, the length of the first straight section in the second direction is smaller than the length of the second straight section in the second direction; in this way, the first connection portion 41 and the second connection portion 42 can be staggered in the second direction, so that the first connection portion 41 and the second connection portion 42 are arranged with a height difference in the second direction.

[0078] For example, when the symmetrical telescopic portion 43 is arranged on the side of the second connecting plate 40 close to the pole 32, the first connecting portion 41 can be closer to the pole 32, so that the dimension of the pole 32 in the second direction can be set shorter, thereby reducing the production cost of the pole 32; moreover, when the initial structural member is translated onto the cover plate assembly 30, the pole 32 can be reliably contacted with the first connecting portion 41, so that the pole 32 and the first connecting portion 41 can be reliably welded together, thereby improving the reliability of the battery cell 100.

[0079] For example, when the symmetrical telescopic portion 43 is arranged on the side of the second connecting piece 40 away from the pole 32, the first connecting portion 41 can be moved away from the pole 32 relative to the second connecting portion 42, so that the first connecting portion 41 is accommodated in the space defined by the pole ear 22 and the winding core body 21, thereby improving the space utilization of the accommodating cavity 11 and making the overall structure of the battery cell 100 more compact; moreover, the length of the pole 32 protruding from the cover plate can be longer, which can effectively avoid the problem of cold welding between the first connecting portion 41 and the pole 32 due to interference between the second connecting portion 42 and the cover body 31, so that the pole 32 and the first connecting portion 41 can be reliably contacted, so that the pole 32 and the first connecting portion 41 can be reliably welded together, thereby improving the reliability of the battery cell 100.

[0080] According to some embodiments provided by the present disclosure, the length of the first straight section in the second direction is greater than the length of the second straight section in the second direction. In this way, the first connecting portion 41 and the second connecting portion 42 can be staggered in the second direction, so that the first connecting portion 41 and the second connecting portion 42 are arranged with a height difference in the second direction.

[0081] For example, when the symmetrical telescopic portion 43 is arranged on the side of the second connecting piece 40 close to the pole 32, the first connecting portion 41 can be moved away from the pole 32 relative to the second connecting portion 42, so that the first connecting portion 41 can be accommodated in the space defined by the pole ear 22 and the winding core body 21, thereby improving the space utilization of the accommodating cavity 11 and making the overall structure of the battery cell 100 more compact; moreover, the length of the pole 32 protruding from the cover plate can be longer, which can effectively avoid the problem of cold welding between the first connecting portion 41 and the pole 32 due to interference between the second connecting portion 42 and the cover body 31, so that the pole 32 and the first connecting portion 41 can be reliably contacted, so that the pole 32 and the first connecting portion 41 can be reliably welded together, thereby improving the reliability of the battery cell 100.

[0082] For example, when the symmetrical telescopic portion 43 is arranged on the side of the second connecting plate 40 away from the pole 32, the first connecting portion 41 can be closer to the pole 32, so that the size of the pole 32 in the second direction can be set shorter, thereby reducing the production cost of the pole 32; moreover, when the initial structural member is translated onto the cover plate assembly 30, the pole 32 can be reliably contacted with the first connecting portion 41, so that the pole 32 and the first connecting portion 41 can be reliably welded together, thereby improving the reliability of the battery cell 100.

[0083] According to some embodiments provided by the present disclosure, the end of the folding segment 431 close to the first connecting portion 41 is the first end, and the end of the folding segment 431 away from the first connecting portion 41 is the second end; there are multiple folding segments 431, and the multiple folding segments 431 are arranged in sequence along the first direction, and the first end of one of two adjacent folding segments 431 is connected to the second end of the other. In this way, the size adjustment range of the connecting piece 40 in the first direction can be increased, and the applicability of the connecting piece 40 can be further improved.

[0084] It should be explained that the multiple mentioned in this article refers to two or more.

[0085] According to some embodiments provided by the present disclosure, the telescopic portion 43 further includes a third straight section connected, the third straight section extends along the second direction, one end of the third straight section is connected to the first end of one of the two adjacent folding sections 431, and the other end is connected to the second end of the other of the two adjacent folding sections 431. In this way, the two adjacent symmetrical telescopic portions 43 can be folded or opened by squeezing the third straight section, which facilitates the opening and folding of the symmetrical telescopic portions 43, and improves the convenience of adjusting the size of the connecting piece 40 in the first direction.

[0086] According to some embodiments provided by the present disclosure, a pre-folding indentation is provided on the folding section 431, and in the first direction, the parts of the folding section 431 located on both sides of the pre-folding indentation are symmetrical along the second direction, that is, the parts of the folding section 431 located on both sides of the pre-folding indentation are symmetrically arranged on both sides of the symmetry axis of the folding section 431. In this way, the part of the folding section 431 provided with the pre-folding indentation can be more easily deformed, and in the process of folding or unfolding the symmetrical telescopic part 43, the symmetrical telescopic part 43 can be reliably symmetrically folded or unfolded, thereby improving the reliability of the connecting piece 40.

[0087] Reference Figure 1-Figure 3 The present application also discloses a battery cell 100, comprising: a shell 10, a battery cell body 20, a cover assembly 30 and a connecting piece 40, the shell 10 defines a accommodating cavity 11 with an opening, the battery cell body 20 is arranged in the accommodating cavity 11, and the battery cell body 20 has pole ears 22 that are opposite and spaced apart along a first direction, the cover assembly 30 is sealed at the opening of the accommodating cavity 11, and the cover assembly 30 has a pole 32; the connecting piece 40 is a connecting piece 40 provided according to the above disclosure, the first connecting portion 41 is welded to the pole 32, and the second connecting portion 42 is welded to the pole ear 22.

[0088] For example, refer to Figure 2 and Figure 3 The cell body 20 includes two winding cores 2, which are arranged opposite to each other along the first direction. Each winding core 2 includes a winding core body 21 and a tab 22, and the tabs 22 of the two winding cores 2 are arranged opposite to each other and spaced apart along the first direction. The tab 22 includes a bending portion 221 and a connecting portion 222, the bending portion 221 extends along the second direction, and the bending portion 221 is connected to the winding core body 21, and the connecting portion 222 extends along the first direction, and one end of the connecting portion 222 is connected to one end of the bending portion 221 away from the winding core body 21.

[0089] The connecting piece 40 is disposed between the two bent portions 221, and the connecting piece 40 is connected to the corresponding two connecting portions 222; optionally, the connecting piece 40 can be connected to the corresponding two connecting portions 222 on one side of the winding core body 21, and the connecting piece 40 can also be connected to the corresponding two connecting portions 222 on one side of the covering plate assembly 30. The covering plate assembly 30 includes a covering body 31 and a pole 32, the covering body 31 is sealed at the opening of the accommodating cavity 11, the pole 32 is penetrated on the covering body 31, and the pole 32 is connected to the connecting piece 40.

[0090] According to the battery cell 100 provided in the embodiment of the present disclosure, by setting the above-mentioned connecting piece 40, the size of the connecting piece 40 in the first direction can be adjusted by folding or unfolding the telescopic portion 43, and the size of the connecting piece 40 in the first direction can be adjusted to match the pole lug 22, so that the second connecting portion 42 can reliably support the pole lug 22, preventing the second connecting portion 42 from pulling the pole lug 22 and causing damage to the pole lug 22, thereby improving the reliability of the battery cell 100 and reducing the production cost of the battery cell 100.

[0091] The present application also discloses a battery pack, including: a battery cell 100 provided according to the above disclosure.

[0092] According to the battery pack provided by the embodiment of the present disclosure, by providing the above-mentioned battery cell 100 , the reliability of the battery cell 100 can be improved and the production cost of the battery cell 100 can be reduced.

[0093] The present application also discloses a vehicle, comprising: a battery pack provided according to the above disclosure. For example, the vehicle may be a car.

[0094] According to the vehicle provided by the embodiment of the present disclosure, by providing the above-mentioned battery pack, the reliability of the battery pack can be improved, the production cost of the battery pack can be reduced, and the cost of the entire vehicle can be reduced.

[0095] It should be noted that, in this article, relational terms such as "first" and "second" 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 existence of other identical elements in the process, method, article or device including the elements.

[0096] The above description is only a specific embodiment of the present disclosure, so that those skilled in the art can understand or implement the present disclosure. 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 disclosure. Therefore, the present disclosure will not be limited to the embodiments described herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A connecting sheet, characterized in that: include: a first connecting portion; A second connecting portion, arranged at intervals with the first connecting portion along a first direction; and, The telescopic portion connects the first connection portion and the second connection portion, and the telescopic portion is used to adjust the distance between two ends thereof in the first direction.

2. The connecting piece according to claim 1, characterized in that: There are two second connection parts, which are respectively arranged on two sides of the first connection part in the first direction.

3. The connecting sheet according to claim 1, characterized in that: There is one second connecting portion, which includes a connecting section and a transition section. There are two transition sections, which are respectively connected to two ends of the connecting section in the second direction. In the first direction, one end of the telescopic portion is connected to the connecting section, and the other end is connected to the first connecting portion. The first direction is perpendicular to the second direction.

4. The connecting sheet according to claim 1, characterized in that: The telescopic portion includes a folding section, the folding section defines a folding space with an opening, the folding section can be folded symmetrically, and the symmetry axis of the folding section is parallel to the second direction. In the first direction, one end of the folding section is connected to the first connecting portion, and the other end is connected to the second connecting portion; The first direction is perpendicular to the second direction.

5. The connecting piece according to claim 4, characterized in that: The telescopic portion further includes a first straight section and a second straight section, wherein the first straight section and the second straight section both extend along the second direction; One end of the first straight section is connected to one end of the folded section close to the first connecting portion, and the other end of the first straight section is connected to the first connecting portion; One end of the second straight section is connected to an end of the folded section close to the second connecting portion, and the other end of the second straight section is connected to the second connecting portion.

6. The connecting piece according to claim 5, characterized in that: The length of the first straight section in the second direction is not equal to the length of the second straight section in the second direction.

7. The connecting piece according to any one of claims 4 to 6, characterized in that: There are a plurality of symmetrical folding segments, and the plurality of symmetrical folding segments are arranged in sequence along the first direction, an end of each folding segment close to the first connecting portion is a first end, and an end of each folding segment away from the first connecting portion is a second end; The first end of one of two adjacent folded segments is connected to the second end of the other one.

8. The connecting piece according to claim 7, characterized in that: The folding section is provided with a pre-folding indentation, the pre-folding indentation extends along a third direction, and in the first direction, parts of the folding section located on both sides of the pre-folding indentation are symmetrical along the second direction; The third direction is perpendicular to the second direction, and the third direction is perpendicular to the first direction.

9. A battery cell, characterized in that: include: A housing, wherein the housing defines a receiving cavity having an opening; A battery cell body, wherein the battery cell body is disposed in the accommodating cavity and has a pole ear; a cover plate assembly, the cover plate assembly is sealed at the opening of the accommodating cavity and has a pole; and, A connecting piece according to any one of claims 1 to 8.

10. A battery pack, characterized in that: include: The battery cell according to claim 9.

11. A vehicle, characterized in that: include: The battery pack according to claim 10.

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