Connecting piece, single cell, battery module and electrical equipment

Abstract

The present application discloses a connecting piece, a single cell, a battery module and an electrical device, and relates to the technical field of electrical devices. The connecting piece includes a first connecting portion and a second connecting portion, the first connecting portion is used to connect to the pole of the battery; the second connecting portion is arranged on the side of the first connecting portion away from the pole, the second connecting portion is connected to the first connecting portion, and the second connecting portion is used to connect to the pole of the battery; wherein the welding surface of the first connecting portion connected to the pole and the welding surface of the second connecting portion connected to the pole are arranged vertically, and the welding surface of the second connecting portion is arranged parallel to the pole. The present application can facilitate the welding of the pole, reduce the difficulty of welding, improve the strength of the connecting piece, and improve the situation of cold welding of the pole.

Description

Technical Field

[0001] The present application relates to the technical field of electrical equipment, and in particular to a connecting piece, a single cell, a battery module and electrical equipment. Background Art

[0002] At present, new energy batteries are in a stage of rapid development, and customers require higher and higher energy density of batteries under the premise of safety. Some current connection plate solutions and the connection methods of the tabs cause tab redundancy of the battery cell. In extreme cases, the redundancy of the tabs is likely to cause the tabs to be inserted into the core pack, resulting in a short circuit of the battery cell.

[0003] Usually, the connecting piece of the battery is a flat plate structure. When the battery cell is composed of four or more core packs, the path of the pole ear will be particularly long, resulting in redundancy of the pole ear near the core pack, which poses a risk of short circuit. In addition, the position of the welding pole ear on the connecting piece is perpendicular to the pole ear, which makes welding difficult. In addition, the structural strength of this connecting piece is low. The welding of the pole ear and the connecting piece is prone to cause the pole ear to be poorly welded due to the low structural strength and unevenness of the connecting piece. Utility Model Content

[0004] In view of this, the purpose of the present application is to provide a connecting piece, a single cell, a battery module and an electrical device, aiming to solve the technical problems in the prior art.

[0005] To achieve the above objectives, the technical solutions adopted in this application are as follows:

[0006] In a first aspect, an embodiment of the present application provides a connecting sheet, including:

[0007] A first connection portion, the first connection portion is used to connect to a pole of a battery;

[0008] A second connection portion, the second connection portion is arranged on a side of the first connection portion away from the pole, the second connection portion is connected to the first connection portion, and the second connection portion is used to connect to a pole lug of the battery;

[0009] The welding surface of the first connection part connected to the pole and the welding surface of the second connection part connected to the pole tab are arranged perpendicularly, and the welding surface of the second connection part is arranged parallel to the pole tab.

[0010] In one embodiment of the first aspect, the first connecting portion includes a first welding plate, which is arranged at an end of the second connecting portion close to the pole, and the first welding plate includes a first welding surface, which is arranged on a side of the first welding plate away from the second connecting portion, and the first welding surface is used to connect to the pole.

[0011] In one embodiment of the first aspect, the second connecting portion includes:

[0012] A second welding piece, the second welding piece is arranged on a side of the first welding piece away from the pole, and the second welding piece is located on one side of the first welding piece, the second welding piece is arranged perpendicular to the first welding piece, and the second welding piece is used for welding with the pole lug;

[0013] A third welding plate, wherein the third welding plate is arranged on a side of the first welding plate away from the pole, the third welding plate is located on a side of the first welding plate away from the second welding plate, the third welding plate is arranged perpendicular to the first welding plate, the third welding plate is arranged parallel to the second welding plate, and the third welding plate is used for welding to the pole ear.

[0014] In one embodiment of the first aspect, the second welding plate is connected to the first welding plate, and a first arc structure is formed at a connection between the second welding plate and the first welding plate, the third welding plate is connected to the first welding plate, and a second arc structure is formed at a connection between the third welding plate and the first welding plate, and the first welding plate, the second welding plate and the third welding plate are integrally formed.

[0015] In one embodiment of the first aspect, the thicknesses of the first welding plate, the second welding plate and the third welding plate are equal, and the thicknesses of the first welding plate, the second welding plate and the third welding plate are all in the range of 0.5 mm to 2.5 mm.

[0016] In one embodiment of the first aspect, the second welding sheet comprises:

[0017] A second welding surface, the second welding surface is arranged on a side of the second welding sheet away from the third welding sheet, the second welding surface is parallel to the welding surface of the tab, and the second welding surface is used to connect to a single-core tab or a double-core tab;

[0018] The third welding surface is arranged on a side of the second welding sheet away from the second welding surface, the third welding surface is parallel to the welding surface of the tab, and the third welding surface is used to connect with the single-core tab.

[0019] In one embodiment of the first aspect, the third welding sheet comprises:

[0020] A fourth welding surface, the fourth welding surface is arranged on a side of the third welding sheet away from the second welding sheet, the fourth welding surface is parallel to the welding surface of the tab, and the fourth welding surface is used to connect to a single-core tab or a double-core tab;

[0021] A fifth welding surface, the fifth welding surface is arranged on a side of the third welding sheet away from the fourth welding surface, the fifth welding surface is parallel to the welding surface of the tab, and the fifth welding surface is used to connect to the single-core tab.

[0022] In a second aspect, an embodiment of the present application provides a single cell battery, comprising the connecting piece described in any of the above embodiments.

[0023] In a third aspect, an embodiment of the present application provides a battery module, comprising a single cell as described in any of the above embodiments.

[0024] In a fourth aspect, an embodiment of the present application provides an electrical device, comprising the battery module described in any of the above embodiments.

[0025] Compared with the prior art, the beneficial effects of the present application are as follows: the present application proposes a connecting piece, a single cell, a battery module and an electrical device. The connecting piece includes a first connecting part and a second connecting part, the first connecting part is used to connect to the pole of the battery, the second connecting part is arranged on the side of the first connecting part away from the pole, the second connecting part is connected to the first connecting part, and the second connecting part is used to connect to the pole of the battery, wherein the welding surface of the first connecting part connected to the pole and the welding surface of the second connecting part connected to the pole are arranged vertically, and the welding surface of the second connecting part is arranged parallel to the pole. The present application facilitates the welding of the pole, reduces the difficulty of welding, improves the strength of the connecting piece, and improves the situation of cold welding of the pole. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0027] Figure 1 A schematic diagram of the three-dimensional structure of the connecting piece in the present application is shown;

[0028] Figure 2 Another schematic diagram of the three-dimensional structure of the connecting piece in the present application is shown;

[0029] Figure 3 Another three-dimensional structural schematic diagram of the connecting piece in the present application is shown;

[0030] Figure 4A partial structural schematic diagram of a single-cell battery using a single-core tab in the present application is shown;

[0031] Figure 5 Another partial structural schematic diagram of a single-cell battery using a single-core tab in the present application is shown;

[0032] Figure 6 Another partial structural schematic diagram of a single-cell battery using a single-core tab in the present application is shown;

[0033] Figure 7 A partial structural schematic diagram of a single cell using dual-core tabs in the present application is shown;

[0034] Figure 8 Another partial structural schematic diagram of a single cell using dual-core tabs in the present application is shown;

[0035] Fig. 9 Another partial structural schematic diagram of a single cell using dual-core tabs in the present application is shown.

[0036] Description of main component symbols:

[0037] 100-connecting piece; 110-first connecting part; 111-first welding piece; 1111-first welding surface; 120-second connecting part; 121-second welding piece; 1211-second welding surface; 1212-third welding surface; 122-third welding piece; 1221-fourth welding surface; 1222-fifth welding surface; 200-single cell; 101-core pack; 102-single-core pole ear; 103-dual-core pole ear. DETAILED DESCRIPTION

[0038] The embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application, and cannot be understood as limiting the present application.

[0039] In the description of the present application, 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 application 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 application.

[0040] 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. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0041] In this application, 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 connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0042] In the present application, 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”, and “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”, and “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.

[0043] like Figure 1 , Figure 4 , Figure 5 , Figure 7 and Figure 8 As shown, an embodiment of the present application provides a connecting sheet 100. The connecting sheet 100 includes a first connecting portion 110 and a second connecting portion 120.

[0044] Specifically, the first connection portion 110 is used to be welded to a pole of a battery, and the second connection portion 120 is disposed on a side of the first connection portion 110 away from the pole.

[0045] The second connection portion 120 is connected to the first connection portion 110 . In this embodiment, the second connection portion 120 is welded to the tab of the battery.

[0046] The welding surface of the first connection part 110 connected to the pole and the welding surface of the second connection part 120 connected to the pole tab are arranged perpendicularly, and the welding surface of the second connection part 120 is arranged parallel to the pole tab.

[0047] In the related art, the connecting piece 100 of the battery is usually a flat structure. When the battery cell is composed of four or more core packs 101, the path of the pole ear will be particularly long, resulting in redundancy of the pole ear near the core pack 101, and the risk of short circuit. In addition, the position of the welding pole ear on the connecting piece 100 is perpendicular to the pole ear, and the welding is difficult. In addition, the structural strength of such connecting piece 100 is low, and the welding of the pole ear and the connecting piece 100 is easy to cause the pole ear to be poorly welded due to the low structural strength and unevenness of the connecting piece 100.

[0048] In this embodiment, the connecting piece 100 includes a first connecting portion 110 and a second connecting portion 120. This embodiment facilitates the welding of the pole lug, reduces the welding difficulty, improves the strength of the connecting piece 100, and improves the problem of pole lug cold welding by vertically arranging the welding surface of the first connecting portion 110 connected to the pole and the welding surface of the second connecting portion 120 connected to the pole lug, and making the welding surface of the second connecting portion 120 parallel to the pole lug.

[0049] Alternatively, if Figure 2 and Figure 3 As shown, the first connection portion 110 includes a first welding piece 111 , and the first welding piece 111 is disposed at one end of the second connection portion 120 close to the pole.

[0050] Specifically, Figure 2 and Figure 3 As shown, the first welding piece 111 includes a first welding surface 1111 , which is disposed on a side of the first welding piece 111 away from the second connecting portion 120 , and the first welding surface 1111 is used to connect to the pole.

[0051] Optionally, the thickness of the first welding sheet 111 is in the range of 0.5 mm to 2.5 mm.

[0052] Alternatively, if Figure 2 and Figure 3 As shown, the second connection portion 120 includes a second welding piece 121 and a third welding piece 122 .

[0053] The second welding piece 121 is disposed on a side of the first welding piece 111 away from the pole, and the second welding piece 121 is located on one side of the first welding piece 111 .

[0054] It should be noted that the second welding piece 121 is connected to the first welding piece 111, and the connection between the second welding piece 121 and the first welding piece 111 forms a first arc structure, and the second welding piece 121 is vertically arranged to the first welding piece 111. In this embodiment, the second welding piece 121 is welded to the tab.

[0055] Specifically, the third welding piece 122 is disposed on a side of the first welding piece 111 away from the pole, and the third welding piece 122 is located on a side of the first welding piece 111 away from the second welding piece 121 .

[0056] Among them, Figure 2 and Figure 3 As shown, the third welding piece 122 is connected to the first welding piece 111, and the connection between the third welding piece 122 and the first welding piece 111 forms a second arc structure, and the third welding piece 122 is arranged perpendicular to the first welding piece 111, and the third welding piece 122 is arranged parallel to the second welding piece 121. In this embodiment, the third welding piece 122 is welded to the tab.

[0057] Optionally, the first welding sheet 111 , the second welding sheet 121 and the third welding sheet 122 are integrally formed.

[0058] Specifically, the connecting piece 100 of this embodiment is formed into the second connecting portion 120 by punching and bending 90 degrees through a flat plate structure, that is, the first connecting portion 110 is the welding position between the pole and the connecting piece 100, and the second connecting portion 120 is the welding position between the pole ear and the connecting piece 100.

[0059] The connecting piece 100 of this embodiment is stamped and bent so that the connection between the first welding piece 111 and the second welding piece 121 forms a first arc structure, and the connection between the first welding piece 111 and the third welding piece 122 forms a second arc structure, thereby effectively increasing the structural strength of the connecting piece 100 and improving the poor welding of the tab.

[0060] Optionally, the first welding sheet 111 , the second welding sheet 121 and the third welding sheet 122 are all of equal thickness, and the thickness of the second welding sheet 121 is in the range of 0.5 mm to 2.5 mm, and the thickness of the third welding sheet 122 is also in the range of 0.5 mm to 2.5 mm.

[0061] Among them, the thickness of the first welding sheet 111, the second welding sheet 121 and the third welding sheet 122 is, for example, 0.5 mm, or the thickness of the first welding sheet 111, the second welding sheet 121 and the third welding sheet 122 is, for example, 2 mm, or the thickness of the first welding sheet 111, the second welding sheet 121 and the third welding sheet 122 is, for example, 2.5 mm.

[0062] Alternatively, if Figure 2 and Figure 3 As shown, the second welding sheet 121 includes a second welding surface 1211 and a third welding surface 1212 .

[0063] The second welding surface 1211 is disposed on a side of the second welding sheet 121 away from the third welding sheet 122, and the second welding surface 1211 is parallel to the welding surface of the tab. In this embodiment, the single-core tab 102 or the dual-core tab 103 is welded via the second welding surface 1211.

[0064] In addition, the third welding surface 1212 is disposed on a side of the second welding sheet 121 away from the second welding surface 1211 , and the third welding surface 1212 is parallel to the welding surface of the tab. In this embodiment, the single-core tab 102 is welded via the third welding surface 1212 .

[0065] Alternatively, if Figure 2 and Figure 3 As shown, the third welding sheet 122 includes a fourth welding surface 1221 and a fifth welding surface 1222 .

[0066] The fourth welding surface 1221 is disposed on a side of the third welding sheet 122 away from the second welding sheet 121, and the fourth welding surface 1221 is parallel to the welding surface of the tab. In this embodiment, the single-core tab 102 is connected or the dual-core tab 103 is welded through the fourth welding surface 1221.

[0067] In addition, the fifth welding surface 1222 is disposed on a side of the third welding sheet 122 away from the fourth welding surface 1221, and the fifth welding surface 1222 is parallel to the welding surface of the tab. In this embodiment, the single-core tab 102 is welded via the fifth welding surface 1222.

[0068] Alternatively, if Figure 4 , Figure 5 and Figure 6 As shown, when there are four core packs 101 in the battery, and when the four core packs 101 are connected to the connecting piece 100 of this embodiment through four single-core pole tabs 102, each core pack 101 is pre-welded to a single-core pole tab 102 separately, and then the four single-core pole tabs 102 welded with the core packs 101 are respectively welded to the second welding surface 1211, the third welding surface 1212, the fourth welding surface 1221 and the fifth welding surface 1222.

[0069] Among them, the pre-welding width of each core package 101 and the single-core pole ear 102 is a, the thickness of each core package 101 is d, the thickness of the pole ear of the single core package 101 is g, and the thickness of the connecting piece 100 is f, then a=dgf / 2, and the core package 101 is pre-welded with the pole ear using the pre-welding width a calculated by the relationship, which can shorten the pole ear length, thereby avoiding redundancy caused by the pole ear length, that is, avoiding a short circuit caused by the pole ear being inserted into the core package 101.

[0070] Specifically, the width of the connecting sheet 100 is b, then b=2d+f. The thickness f of the connecting sheet 100 satisfies: 0.5mm≤f≤2.5mm, and the height of the connecting sheet 100 is e, and the height of the single-core tab 102 is c, satisfying f+c≤e≤f+c+3.

[0071] Alternatively, if Figure 7 , Figure 8 and Fig. 9 As shown, when there are four core packs 101 in the battery, and when the four core packs 101 are connected to the connecting piece 100 of this embodiment through two dual-core pole ears 103, every two core packs 101 are pre-welded to one dual-core pole ear 103, and then the two dual-core pole ears 103 welded with the core packs 101 are respectively welded to the second welding surface 1211 and the fourth welding surface 1221.

[0072] Optionally, the pre-welding width of each core package 101 and the dual-core tab 103 is a, the thickness of each core package 101 is d, and the thickness of the tab of the dual core package 101 is g, then a=dg, and the core package 101 is pre-welded with the tab using the pre-welding width a calculated by the relationship, which can shorten the length of the tab, thereby avoiding redundancy caused by the length of the tab, that is, avoiding a short circuit caused by the tab being inserted upside down into the core package 101.

[0073] Specifically, the width of the connecting piece 100 is b, then b=2d, wherein the height of the connecting piece 100 is e, the height of the dual-core tab 103 is c, and the thickness of the connecting piece 100 is f, satisfying f+c≤e≤f+c+3, wherein the thickness f of the connecting piece 100 satisfies: 0.5mm≤f≤2.5mm.

[0074] like Figure 4 and Figure 7 As shown, this embodiment provides a single cell 200, which has the connecting sheet 100 described in any of the above embodiments, and thus has all the beneficial effects of the connecting sheet 100, which will not be described in detail here. Specifically, the single cell 200 of this embodiment also includes a top cover, a core pack 101, a polyester film, a bottom support sheet, and an aluminum shell.

[0075] This embodiment provides a battery module having the single cell 200 described in any of the above embodiments, and thus having all the beneficial effects of the single cell 200, which will not be described in detail here.

[0076] This embodiment provides an electric device, which has the battery module described in any of the above embodiments, and thus has all the beneficial effects of the battery module, which will not be described in detail here. The electric device is, for example, an electric vehicle.

[0077] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means 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 application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described 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.

[0078] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the present application. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present application.

Claims

1. A connecting sheet, characterized in that: include: A first connection portion, the first connection portion is used to connect to a pole of a battery; A second connection portion, the second connection portion is arranged on a side of the first connection portion away from the pole, the second connection portion is connected to the first connection portion, and the second connection portion is used to connect to a pole lug of the battery; The welding surface of the first connection part connected to the pole and the welding surface of the second connection part connected to the pole tab are arranged perpendicularly, and the welding surface of the second connection part is arranged parallel to the pole tab.

2. The connecting piece according to claim 1, characterized in that: The first connection portion includes a first welding plate, which is arranged at an end of the second connection portion close to the pole. The first welding plate includes a first welding surface, which is arranged on a side of the first welding plate away from the second connection portion. The first welding surface is used to connect to the pole.

3. The connecting piece according to claim 2, characterized in that: The second connecting portion comprises: A second welding piece, the second welding piece is arranged on a side of the first welding piece away from the pole, and the second welding piece is located on one side of the first welding piece, the second welding piece is arranged perpendicular to the first welding piece, and the second welding piece is used for welding with the pole lug; A third welding plate, wherein the third welding plate is arranged on a side of the first welding plate away from the pole, the third welding plate is located on a side of the first welding plate away from the second welding plate, the third welding plate is arranged perpendicular to the first welding plate, the third welding plate is arranged parallel to the second welding plate, and the third welding plate is used for welding to the pole ear.

4. The connecting piece according to claim 3, characterized in that: The second welding sheet is connected to the first welding sheet, and a first arc structure is formed at a connection between the second welding sheet and the first welding sheet; The third welding sheet is connected to the first welding sheet, and a second arc structure is formed at a connection between the third welding sheet and the first welding sheet. The first welding sheet, the second welding sheet and the third welding sheet are integrally formed.

5. The connecting piece according to claim 3, characterized in that: The thicknesses of the first welding sheet, the second welding sheet and the third welding sheet are all equal, and the thicknesses of the first welding sheet, the second welding sheet and the third welding sheet are all in the range of 0.5 mm to 2.5 mm.

6. The connecting sheet according to claim 3, characterized in that: The second welding sheet comprises: A second welding surface, the second welding surface is arranged on a side of the second welding sheet away from the third welding sheet, the second welding surface is parallel to the welding surface of the tab, and the second welding surface is used to connect to a single-core tab or a double-core tab; The third welding surface is arranged on a side of the second welding sheet away from the second welding surface, the third welding surface is parallel to the welding surface of the tab, and the third welding surface is used to connect with the single-core tab.

7. The connecting sheet according to claim 3, characterized in that: The third welding sheet comprises: A fourth welding surface, the fourth welding surface is arranged on a side of the third welding sheet away from the second welding sheet, the fourth welding surface is parallel to the welding surface of the tab, and the fourth welding surface is used to connect to a single-core tab or a double-core tab; A fifth welding surface, the fifth welding surface is arranged on a side of the third welding sheet away from the fourth welding surface, the fifth welding surface is parallel to the welding surface of the tab, and the fifth welding surface is used to connect to the single-core tab.

8. A single cell battery, characterized in that: The invention comprises the connecting piece according to any one of claims 1 to 7.

9. A battery module, characterized in that: Comprising the single cell battery as claimed in claim 8.

10. An electrical device, characterized in that: Comprising the battery module as claimed in claim 9.

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