Connecting structure of connecting piece tabs, battery cell, battery pack and vehicle

Abstract

The embodiment of the utility model provides a connecting structure of a connecting piece tab, a battery cell, a battery pack and a vehicle. The connecting structure of the connecting piece and the tab, disclosed by the embodiment of the utility model, comprises the connecting piece and the tab. The connecting sheet is provided with a first side and a second side which are oppositely arranged along the thickness direction of the connecting sheet, and the first side is provided with a convex part used for being connected with a pole; the tabs have multiple layers, at least one layer of tab is connected with the first side, and at least another layer of tab is connected with the second side. According to the connecting structure of the connecting piece and the electrode lug, the first side is provided with the convex part connected with the electrode column, the distance between the connecting piece and the end cover can be increased by arranging the convex part, and therefore the interference problem generated by the end cover is avoided when the electrode lug in the area is welded. Therefore, the connecting structure of the connecting piece and the tab has the advantage of improving the assembling efficiency and the connecting reliability of the battery cell.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, and in particular to a connection structure of a connecting piece and a pole ear, and a battery cell, a battery pack and a vehicle having the connection structure of the connecting piece and a pole ear. Background Art

[0002] The function of the battery cell connecting piece is to connect the pole ear with the pole of the end cover, and the battery cell connecting piece and the pole ear are usually connected by welding to ensure the connection strength and overcurrent strength. The laminated battery cell includes multiple layers of pole ear foils stacked together. As the energy density of the battery cell increases, the number of pole sheets and pole ears also increases. The multi-layer pole ears (greater than 100 layers) are prone to cold welding and excessive local resistance when connected to the connecting piece, resulting in increased welding difficulty and risk. The authorization announcement number is CN216720218U, and the invention name is recorded in the secondary battery. The pole ear is divided into two parts and arranged on both sides of the thickness direction of the connecting piece to reduce the occurrence of cold welding and excessive local resistance. The connecting piece of this structure is a sheet structure, and the pole ear on the side close to the end cover has the problem of interference with the end cover during welding. This causes the problem of low welding efficiency. Utility Model Content

[0003] The utility model aims to solve one of the technical problems in the related art at least to a certain extent. To this end, the embodiment of the utility model provides a connection structure of a connecting piece and a pole ear. The connection structure of the connecting piece and a pole ear has the advantages of reducing the difficulty of welding and improving the stability of connection.

[0004] The embodiment of the utility model further provides a battery cell.

[0005] An embodiment of the present invention further provides a battery pack.

[0006] An embodiment of the utility model further provides a vehicle.

[0007] The connection structure of the connecting piece and the pole ear of the embodiment of the utility model comprises a connecting piece and a pole ear.

[0008] The connecting piece has a first side and a second side arranged opposite to each other along its thickness direction, and the first side is provided with a protrusion for connecting to the pole; the pole ear has multiple layers, at least one layer of the pole ear is connected to the first side, and at least another layer of the pole ear is connected to the second side.

[0009] The connection structure of the connecting piece and the pole lug of the embodiment of the utility model increases the distance between the connecting piece and the end cover plate by providing a convex portion connected to the pole column on the first side, compared with the planar connecting piece structure. Under normal circumstances, when welding the pole lug and the pole column, when the thickness of the pole lug is thick, the pole lug will be close to the end cover plate. The provision of the convex portion can increase the distance between the pole lug and the end cover plate, and thus when welding the pole lug in this area, the installation interference problem caused by the end cover plate in the welding of the pole lug and the pole column is avoided. As a result, the efficiency of welding the connecting piece and the pole column is improved, and the assembly efficiency of the battery as a whole is improved.

[0010] Therefore, the connection structure of the connecting piece and the pole ear in the embodiment of the utility model has the advantages of improving the efficiency of battery cell assembly and connection reliability.

[0011] In some embodiments, a portion of the first side protrudes relative to the remaining portion of the first side toward the pole to form the convex portion, the remaining portion of the first side is connected to the pole lug, and the convex portion is used to connect to the pole.

[0012] In some embodiments, the connecting piece is integrally stamped and formed.

[0013] In some embodiments, the connecting sheet has a first connecting portion, the protrusion, and the second connecting portion connected in sequence along a preset direction, at least one layer of the pole lugs is connected to the first side of the first connecting portion, and at least another layer of the pole lugs is connected to the second side of the first connecting portion.

[0014] In some embodiments, the length of the protrusion along the preset direction is 4.5 mm to 35 mm.

[0015] In some embodiments, the height of the protrusion is 0.5 mm to 2 mm.

[0016] In some embodiments, the number of tab layers connected to the first side is N, the number of tab layers connected to the second side is M, and N / M is 1 / 9 to 1 / 5.

[0017] In some embodiments, the number of layers of the tab is greater than or equal to 100.

[0018] The battery cell of the embodiment of the utility model comprises a battery cell body, an end cover and a connection structure of a connecting piece and a pole ear according to any one of the above, wherein the battery cell body is connected to the pole ear, and the connecting piece is connected to the end cover.

[0019] The battery pack of the embodiment of the present invention includes the battery cell described above.

[0020] The vehicle of the embodiment of the present utility model includes the battery pack described above. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a front view of the connection structure of the connecting piece and the pole ear of the embodiment of the utility model.

[0022] Figure 2 It is a three-dimensional diagram of the connection structure of the connecting piece and the pole ear of the embodiment of the utility model.

[0023] Figure 3 It is a three-dimensional diagram of a connecting piece according to an embodiment of the utility model.

[0024] Reference numerals:

[0025] Connecting piece 1; first connecting portion 11; protrusion 12; second connecting portion 13; first side 101; second side 102;

[0026] Tab 2. DETAILED DESCRIPTION

[0027] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to be used to explain the present invention, but cannot be understood as limiting the present invention.

[0028] Reference below Figure 1-Figure 2 The invention describes the connection structure of the connecting piece and the pole ear, the battery cell, the battery pack and the vehicle in the embodiments of the invention.

[0029] The connection structure of the connecting piece and the pole ear of the embodiment of the utility model comprises a connecting piece 1 and a pole ear 2 .

[0030] The connecting sheet 1 has first sides 101 (eg, Figure 1 ) and a second side 102 (e.g., Figure 1 ), the first side 101 is provided with a protrusion 12 for connecting with the pole; the pole lug 2 has multiple layers, at least one layer of the pole lug 2 is connected to the first side 101, and at least another layer of the pole lug 2 is connected to the second side 102. Specifically, the end cover includes an end cover plate and a pole, the end cover plate has a mounting hole extending along the thickness direction thereof, and the pole is mounted in the mounting hole.

[0031] The connection structure of the connecting piece and the pole lug of the embodiment of the utility model increases the spacing between the connecting piece 1 and the end cover plate by providing a protrusion 12 connected to the pole on the first side 101 of the connecting piece 1, compared with the planar connecting piece structure. Usually, when welding the pole lug 2 and the pole, when the thickness of the pole lug 2 is thick, the pole lug 2 will be close to the end cover plate. The protrusion 12 can increase the spacing between the pole lug 2 and the end cover plate, thereby avoiding the installation interference problem caused by the end cover plate when welding the pole lug 2 in this area. As a result, the efficiency of welding the connecting piece 1 and the pole is improved, thereby improving the assembly efficiency of the battery as a whole.

[0032] In addition, part of the tab 2 is welded on the first side 101, and the other part of the tab 2 is welded on the second side 102, so as to avoid welding cracks and cold welding when the thickness of the tab 2 is too large. This helps to increase the current capacity and power performance of the battery cover.

[0033] Therefore, the connection structure of the connecting piece and the pole ear in the embodiment of the utility model has the advantages of improving the efficiency of battery cell assembly and connection reliability.

[0034] like Figure 1 and Figure 2 As shown, a portion of the first side 101 protrudes toward the pole relative to the rest of the first side 101 to form a protrusion 12 , the rest of the first side 101 is connected to the pole lug 2 , and the protrusion 12 is used to connect to the pole.

[0035] The connection structure of the connecting piece and the pole ear of the embodiment of the utility model can avoid the problem that the second side 102 is a planar structure and the connection piece 1 is heavy due to the addition of a protrusion on the first side 101, by setting the protrusion 12 as a part of the first side 101 protruding in a direction away from the second side 102 relative to the rest of the first side 101 to form the protrusion 12. Therefore, the connection structure of the connecting piece and the pole ear has the advantage of being light.

[0036] Furthermore, if Figure 1 and Figure 2 As shown, the connecting piece 1 is an integrated structure. Therefore, the connecting piece and the connecting lug connection structure of the embodiment of the utility model is processed by the connecting piece 1 in an integrated structure, which has the advantages of high processing convenience and good structural integrity.

[0037] Furthermore, the connecting piece 1 is a stamping structure.

[0038] like Figure 1 and Figure 2 As shown, the connecting piece 1 has a predetermined direction (for example, Figure 1The first connection part 11, the convex part 12 and the second connection part 13 are connected in sequence (in the left and right direction shown in FIG), at least one layer of the pole lug 2 is connected to the first side 101 of the first connection part 11, and at least another layer of the pole lug 2 is connected to the second side 102 of the first connection part 11. It can be understood that the convex part 12 is equivalent to the pole column connection part.

[0039] The connection structure of the connecting piece and the pole ear of the embodiment of the utility model has a relatively small distance between the pole ear 2 and the pole by arranging the protrusion 12 between the first connecting part 11 and the second connecting part 13. Therefore, the structure has the advantages of simple structure and large flow capacity.

[0040] The width of the protrusion 12 along the preset direction is 4.5 mm to 35 mm. Thus, the problem of small welding area and poor stability caused by the protrusion 12 being too small is avoided; the problem of large material consumption and high cost caused by the protrusion 12 being too large is also avoided. Thus, the structure has the advantages of good stability and low cost.

[0041] Exemplarily, the width of the protrusion 12 along the preset direction is 4.5 mm, 6.0 mm, 7.5 mm, 9.0 mm, 10.0 mm, 11.0 mm, 13.0 mm, 15.0 mm, 17.0 mm, 19.0 mm, 21.0 mm, 23.0 mm, 25.0 mm, 27.0 mm, 29.0 mm, 31.0 mm, 33.0 mm, 34.0 mm or 35.0 mm.

[0042] The height of the protrusion 12 is 0.5 mm to 2 mm. Thus, the problem of welding interference caused by the protrusion 12 being too small is avoided, and the problem of the protrusion 12 affecting the flow capacity due to its too large height is also avoided. Thus, the structure has the advantages of high welding effect and good flow capacity.

[0043] Exemplarily, the height of the protrusion 12 is 0.5 mm, 0.60 mm, 0.7 mm, 0.8 mm, 0.9 mm, 1.0 mm, 1.3 mm, 1.5 mm, 1.6 mm, 1.7 mm, 1.8 mm, 1.9 mm or 2.0 mm.

[0044] The number of layers of the tabs 2 connected to the first side 101 is N, the number of layers of the tabs 2 connected to the second side 102 is M, and the ratio of N / M is 1 / 9 to 1 / 5 (in other words, the ratio of N to M is 1 / 9 to 1 / 5). Thus, the problem of too few layers of tabs 2 arranged on the first side 101 affecting the welding quality of the tabs 2 on the second side 102 is avoided, and the problem of too many layers of tabs 2 arranged on the first side 101 causing welding interference between the tabs 2 on this side and the end cover is also avoided.

[0045] N / M is 1 / 9, 1 / 8, 1 / 7, 1 / 6 or 1 / 5.

[0046] Furthermore, the number of layers of the tab 2 is greater than or equal to 100.

[0047] Generally speaking, the larger the number of layers of the tabs 2, the more corresponding pole pieces there are, which helps to increase the capacity of the battery cell. At the same time, the increase in the number of tabs 2 also improves the ability to transfer charge per unit time, which helps to improve the current capacity of the battery cell and achieve the fast charging function.

[0048] The battery cell of the embodiment of the utility model comprises a battery cell body, an end cover and a connection structure of a connecting piece and a pole ear according to any one of the above items, the battery cell body is connected to the pole ear 2, the end cover has the pole, and the connecting piece 1 is connected to the pole.

[0049] Because the battery cell includes the connection structure of the connecting piece and the pole ear, the spacing between the pole ear 2 and the end cover plate is increased when the battery cell is assembled, and when the pole ear in this area is welded, the installation interference problem caused by the end cover plate welding the pole ear and the pole column is avoided. As a result, the efficiency of welding the connecting piece 1 and the pole column is improved, thereby improving the assembly efficiency of the battery as a whole. Therefore, the battery cell of the embodiment of the utility model has the advantage of improving the efficiency of battery cell assembly.

[0050] Furthermore, the battery cell body includes a winding core, one end of the pole ear is connected to the winding core, and the other end of the pole ear extends out of the winding core. The winding core can generally include multiple layers of stacked positive and negative pole sheets, each layer is provided with a pole ear, and the end cover includes an end cover plate and a pole column arranged on the end cover plate. Correspondingly, the pole ear can be divided into a positive pole ear and a negative pole ear, wherein the positive pole ear and the negative pole ear both have multiple layers, each positive pole sheet is connected to a positive pole ear, and each negative pole sheet is connected to a negative pole ear. After the multiple layers of positive pole ears are stacked, they are welded to the protrusion of the connecting piece connected to the positive pole column, and after the multiple layers of negative pole ears are stacked, they are welded to the protrusion of the connecting piece connected to the negative pole column.

[0051] The battery pack of the embodiment of the utility model can include the above-mentioned battery cell. Therefore, the battery pack of the embodiment of the utility model has the advantages of improving the efficiency of battery cell assembly and connection reliability.

[0052] The vehicle of the embodiment of the utility model can include the above-mentioned battery pack. Because the vehicle of the embodiment of the utility model includes the above-mentioned battery pack, when the battery cells in the battery pack are easy to install, the vehicle of the embodiment of the utility model has the advantages of improving the efficiency of battery cell assembly and connection reliability.

[0053] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0054] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present utility model, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0055] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0056] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0057] In the present utility model, the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" etc. mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present utility model. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the described specific features, structures, materials or characteristics may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0058] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations of the present invention. Ordinary technicians in the field can change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. A connection structure of a connecting piece and a pole ear, characterized in that: include: A connecting piece, wherein the connecting piece has a first side and a second side arranged opposite to each other along a thickness direction thereof, and the first side is provided with a protrusion for connecting to a pole; The electrode tab has multiple layers, the electrode tab of at least one layer is connected to the first side, and the electrode tab of at least another layer is connected to the second side.

2. The connection structure of the connecting piece and the pole ear according to claim 1, characterized in that: A portion of the first side protrudes relative to the remaining portion of the first side toward the direction close to the pole to form the convex portion, the remaining portion of the first side is connected to the pole lug, and the convex portion is used to be connected to the pole.

3. The connection structure of the connecting piece and the pole ear according to claim 2, characterized in that: The connecting piece is an integrated structure.

4. The connection structure of the connecting piece and the pole ear according to claim 2, characterized in that: The connecting sheet comprises a first connecting portion, a protruding portion, and a second connecting portion which are sequentially connected along a preset direction, at least one layer of the pole lugs is connected to the first side of the first connecting portion, and at least another layer of the pole lugs is connected to the second side of the first connecting portion.

5. The connection structure of the connecting piece and the pole ear according to claim 4, characterized in that: The length of the protrusion along the preset direction is 4.5 mm to 35 mm.

6. The connection structure of the connecting piece and the tab according to claim 1, characterized in that: The height of the protrusion is 0.5 mm to 2 mm.

7. The connection structure of the connecting piece and the pole ear according to claim 1, characterized in that: The number of tab layers connected to the first side is N, the number of tab layers connected to the second side is M, and N / M is 1 / 9 to 1 / 5; And / or, the number of layers of the tabs is greater than or equal to 100.

8. A battery cell, characterized in that: The invention comprises a battery cell body, an end cover and a connection structure of a connecting piece and a pole ear according to any one of claims 1 to 7, wherein the battery cell body is connected to the pole ear, the end cover has a pole, and the connecting piece is connected to the pole.

9. A battery pack, characterized in that: Comprising the battery cell according to claim 8.

10. A vehicle, characterized in that: Comprising a battery pack according to claim 9.

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