Battery cell, battery pack and electric equipment

Abstract

The utility model relates to a battery cell, a battery pack and electric equipment. The battery cell comprises a shell, wherein a roll core is accommodated in the shell; a pole structure is arranged at the top of the shell, the pole structure comprises a first pole and a second pole which are arranged in parallel, and each of the first pole and the second pole comprises a first electric connection end located outside the shell and a second electric connection end located in the shell; the second electric connection end of the first pole is connected with the positive electrode of the roll core, and the second electric connection end of the second pole is connected with the negative electrode of the roll core; and the first electric connecting ends of the first pole and the second pole are used for being welded with an electric connecting piece outside the battery cell. According to the scheme provided by the invention, the stability of a battery cell welding process can be improved, and defective products such as pseudo soldering and weld penetration which are easy to occur in related technologies can also be avoided.

Description

Technical Field

[0001] The present application relates to the field of new energy technology, and in particular to battery cells, battery packs and electrical equipment. Background Art

[0002] Cylindrical battery cells are a type of battery with high energy density, high safety and broad application prospects. The advantages of cylindrical battery cells are their large single cell capacity and high energy density. Moreover, compared with square shell battery cell modules of the same size, when a single cell has thermal runaway, catches fire or explodes, the heat generated by the cylindrical battery cell module will be much smaller, and it has higher safety.

[0003] In the related art, the top cover of the cylindrical battery cell is generally made of nickel-plated steel. When making high-voltage connections to the battery pack, the negative electrode top cover made of nickel-plated steel is difficult to weld to the high-voltage aluminum busbar and copper busbar, resulting in poor stability of the welding process and prone to defective products such as cold welding and welding penetration. Utility Model Content

[0004] In order to solve or partially solve the problems existing in the related art, the present application provides a battery cell, a battery pack and an electrical equipment, which can improve the stability of the battery cell welding process and avoid defective products such as cold soldering and welding through that are easy to occur in the related art.

[0005] The first aspect of the present application provides a battery cell, comprising:

[0006] A shell, wherein a winding core is accommodated inside the shell;

[0007] A pole structure is provided on the top of the shell, the pole structure includes a first pole and a second pole arranged in parallel, the first pole and the second pole each including a first electrical connection end located outside the shell and a second electrical connection end located inside the shell;

[0008] The second electrical connection end of the first pole is connected to the positive electrode of the winding core, and the second electrical connection end of the second pole is connected to the negative electrode of the winding core; the first electrical connection ends of the first pole and the second pole are used for welding with the electrical connector outside the battery cell.

[0009] In one embodiment, a cover plate connected to the shell is provided on the top of the shell, and the cover plate is provided with a first pole hole and a second pole hole;

[0010] The first pole is installed in the first pole hole, the second pole is installed in the second pole hole, and an insulating member is provided between the first pole, the second pole and the cover plate.

[0011] In one embodiment, a terminal assembly is provided on one side of the housing located at the top of the battery cell, and the terminal assembly includes a positive terminal and a negative terminal; the positive terminal and the negative terminal are provided with a pole connecting portion and an electrode connecting portion;

[0012] The pole connecting portion of the positive terminal is welded to the second electrical connecting end of the first pole, and the pole connecting portion of the negative terminal is in contact with the second electrical connecting end of the second pole; the electrical connecting portion of the positive terminal is connected to the collector / transfer plate of the winding core, and the electrical connecting portion of the negative terminal is connected to the negative pole of the winding core or the shell wall of the shell.

[0013] In one embodiment, the distances between the first electrical connection ends of the first pole and the second pole and the cover plate are the same.

[0014] In one embodiment, the shell is cylindrical, the first pole and the second pole are arranged at one axial end of the shell, and the first pole and the second pole are arranged along the diameter direction of the cylinder.

[0015] In one embodiment, the cover plate is made of steel or aluminum.

[0016] In one embodiment, the first pole and the second pole are made of the same material; or

[0017] The first pole and the second pole are made of aluminum or copper.

[0018] In one implementation, the distance between the first electrical connection ends of the first pole and the second pole and the cover plate is 1-2 mm.

[0019] A second aspect of the present application provides a battery pack, comprising:

[0020] A plurality of battery cells as described in the first aspect above; and;

[0021] An electrical connection assembly is connected to the first poles and the second poles of the plurality of battery cells.

[0022] A third aspect of the present application provides an electrical device, comprising the battery pack as described in the second aspect above.

[0023] The technical solution provided by this application may have the following beneficial effects:

[0024] The battery cell provided in the present application includes a shell, wherein a winding core is accommodated inside the shell; a pole structure is provided on the top of the shell, wherein the pole structure includes a first pole and a second pole arranged in parallel, wherein the first pole and the second pole both include a first electrical connection end located outside the shell and a second electrical connection end located inside the shell; the second electrical connection end of the first pole is connected to the positive electrode of the winding core, and the second electrical connection end of the second pole is connected to the negative electrode of the winding core; the first electrical connection ends of the first pole and the second pole are used for welding with the electrical connector outside the battery cell. Since the first pole and the second pole are provided on the top of the battery cell shell, when the high voltage connection of the battery pack is to be made, it is easier to achieve welding between the battery cells through the electrical connector, which can improve the stability of the welding process and avoid defective products such as cold welding and welding through in the related technology.

[0025] It should be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The above and other objects, features and advantages of the present application will become more apparent through a more detailed description of exemplary embodiments of the present application in conjunction with the accompanying drawings, wherein the same reference numerals generally represent the same components in the exemplary embodiments of the present application.

[0027] Figure 1 is a schematic diagram of the structure of a battery cell shown in an embodiment of the present application;

[0028] Figure 2 is a schematic diagram of the assembly of a battery cell shown in an embodiment of the present application;

[0029] Figure 3 is an exploded view of a first pole and a second pole of a battery cell shown in an embodiment of the present application;

[0030] Figure 4 It is a schematic diagram of the connection of the battery cell shown in the embodiment of the present application.

[0031] Figure numerals: 100, battery cell; 110, shell; 120, cover plate; 121, first pole hole; 122, second pole hole; 130, pole structure; 131, first pole; 132, second pole; 1311, first electrical connection terminal; 1312, second electrical connection terminal; 1313, groove; 140, terminal assembly; 141, positive terminal, 142, negative terminal; 1411, protrusion; 150, insulating member; 200, electrical connector. DETAILED DESCRIPTION

[0032] The preferred embodiments of the present application will be described in more detail below with reference to the accompanying drawings. Although the preferred embodiments of the present application are shown in the accompanying drawings, it should be understood that the present application can be implemented in various forms and should not be limited by the embodiments described herein. On the contrary, these embodiments are provided to make the present application more thorough and complete, and to fully convey the scope of the present application to those skilled in the art.

[0033] The terms used in this application are for the purpose of describing specific embodiments only and are not intended to limit this application. The singular forms of "a", "said" and "the" used in this application and the appended claims are also intended to include plural forms unless the context clearly indicates other meanings. It should also be understood that the term "and / or" used herein refers to and includes any or all possible combinations of one or more associated listed items.

[0034] It should be understood that although the terms "first", "second", "third", etc. may be used in this application to describe various information, this information should not be limited to these terms. These terms are only used to distinguish the same type of information from each other. For example, without departing from the scope of this application, the first information may also be referred to as the second information, and similarly, the second information may also be referred to as the first information. Thus, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0035] In the description of the present application, it should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to 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.

[0036] 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.

[0037] In the related art, the top cover of the cylindrical battery cell is generally made of nickel-plated steel. When the battery pack is connected to high voltage, the negative electrode top cover of nickel-plated steel is difficult to weld with the high-voltage aluminum busbar and copper busbar, resulting in poor welding process stability and prone to defective products such as cold welding and welding penetration. In view of the above problems, the embodiment of the present application provides a battery cell, which can improve the stability of the battery cell welding process and avoid defective products such as cold welding and welding penetration that are prone to occur in the related art.

[0038] The technical solution of the embodiments of the present application is described in detail below with reference to the accompanying drawings.

[0039] Figure 1 is a schematic diagram of the structure of a battery cell shown in an embodiment of the present application; Figure 2 It is a schematic diagram of the assembly of the battery cell shown in the embodiment of the present application.

[0040] See also Figure 1 and Figure 2 The present application provides a battery cell 100, which includes a shell 110, and a winding core is accommodated inside the shell 110; a pole structure 130 is provided on the top of the shell 110, and the pole structure 130 includes a first pole 131 and a second pole 132 arranged in parallel, and the first pole 131 and the second pole 132 both include a first electrical connection end 1311 located outside the shell 110 and a second electrical connection end 1312 located inside the shell 110; the second electrical connection end 1312 of the first pole 131 is connected to the positive electrode of the winding core, and the second electrical connection end 1312 of the second pole 132 is connected to the negative electrode of the winding core; the first electrical connection end 1311 of the first pole 131 and the second pole 132 are used for welding with the electrical connector outside the battery cell 100.

[0041] In the solution provided by the present application, since the first pole 131 and the second pole 132 are provided on the top of the shell 110 of the battery cell 100, when the high voltage connection of the battery pack is to be performed, it is easier to weld the battery cells 100 through electrical connectors, which can improve the stability of the welding process and avoid defective products such as cold welding and welding through that are prone to occur in related technologies.

[0042] The battery cell 100 of this embodiment is a cylindrical battery cell 100, the shell 110 is cylindrical and made of steel, the first pole 131 and the second pole 132 are arranged at the same axial end of the shell 110 (i.e., the top of the battery cell 100), and the first pole 131 and the second pole 132 are arranged along the diameter direction of the cylinder. The first pole 131 and the second pole 132 are the same, and are arranged in parallel at the top of the electric property, and the heights of the two are consistent. The top end faces of the first pole 131 and the second pole 132 are welded to the electrical connector, thereby realizing group welding of multiple battery cells 100.

[0043] The cross-sectional shapes of the first pole 131 and the second pole 132 include but are not limited to circular, semicircular, square or other special shapes.

[0044] In this embodiment, the first pole 131 and the second pole 132 are made of the same material, specifically, aluminum. The electrical connector is a high-voltage aluminum bar or copper bar, so welding with the aluminum bar or copper bar is the same material welding, and aluminum has a low melting point, so welding reliability is better.

[0045] See also Figure 2 and Figure 3 In this embodiment, a cover plate connected to the shell 110 is provided on the top of the shell 110, and the cover plate is provided with a first pole hole 121 and a second pole hole 122; the first pole 131 is installed in the first pole hole 121, and the second pole 132 is installed in the second pole hole 122, and the first pole 131 and the second pole 132 are respectively fixed to the first pole hole 121 and the second pole hole 122 by riveting.

[0046] An insulating member 150 is provided between the first pole 131 and the second pole 132 and the cover plate. The insulating member 150 may be a sealing rubber ring, which is used for the first pole 131 and the second pole 132 to form a loop through the cover plate to avoid short circuit.

[0047] In this embodiment, the first pole 131 and the second pole 132 are of an I-shaped structure, and the middle parts of the first pole 131 and the second pole 132 respectively cooperate with the first pole hole 121 and the second pole hole 122, and the axial ends are respectively located on the outside and the inside of the shell 110, the end located on the outside of the shell 110 is the first electrical connection end 1311, and the end located inside the shell 110 is the second electrical connection end 1312.

[0048] In some embodiments, the diameter of the first electrical connection end 1311 and the second electrical connection end 1312 is greater than the diameter of the middle portion of the pole structure 130, so that the first pole 131 and the second pole 132 are stably combined with the top cover. The insulating member is provided between the first electrical connection end 1311 and / or the second electrical connection end 1312 and the outer surface of the top cover, which not only plays an insulating role, but also can improve the installation stability of the first pole 131 and the second pole 132.

[0049] In this embodiment, the distance between the first electrical connection end 1311 of the first pole 131 and the second pole 132 and the cover plate 120 is the same. Specifically, the distance between the first electrical connection end 1311 of the first pole 131 and the second pole 132 and the cover plate 120 is 1-2 mm, that is, the height of the first pole 131 and the second pole 132 is 1-2 mm. Compared with the related art in which the electrical connector is welded to the surface of the top cover, the two poles of the present application are in the same horizontal plane without a height difference. Therefore, it is easier to design a high-voltage connection method, which can increase the weldable area, reduce the difficulty of welding the battery cells in groups, and reduce the fault tolerance of the battery cells in groups.

[0050] In this embodiment, a terminal assembly 140 is provided on one side of the housing 110 located at the top of the battery cell 100, and the terminal assembly 140 includes a positive terminal 141 and a negative terminal 142; the positive terminal 141 and the negative terminal 142 have the same structure and are aligned with the first pole 131 and the second pole 132 respectively. The positive terminal 141 and the negative terminal 142 are provided with a pole connection portion and an electrode connection portion; the pole connection portion of the positive terminal 141 is welded to the second electrical connection end 1312 of the first pole 131, and the pole connection portion of the negative terminal 142 is in contact with the second electrical connection end 1312 of the second pole 132.

[0051] The electrical connection portion of the positive terminal 141 is connected to the current collecting plate or the adapter of the winding core, and the electrical connection portion of the negative terminal 142 is connected to the negative pole of the winding core or the shell wall of the shell 110. The pole connection portion can be a protrusion 1411, and the second electrical connection end 1312 is provided with a groove 1313, and the protrusion is received in the groove 1313 and welded to the surface of the groove 1313.

[0052] In this embodiment, the positive terminal 141 and the negative terminal 142 are sheet-like structures, which may be semicircular and are disposed opposite to each other on the upper end surface of the winding core, and the protrusion 1411 is disposed in the middle of the sheet-like structure.

[0053] In this embodiment, when the positive and negative pole ears of the winding core are located at the upper and lower ends of the winding core, the negative pole ear at the bottom end of the winding core is connected to the shell wall of the shell 110, and the electrical connection part of the negative terminal 142 is connected to the shell wall of the shell 110; when the positive and negative pole ears of the winding core are located at the same end of the winding core, that is, the top end of the winding core, the electrical connection part of the negative terminal 142 is connected to the negative pole at the top end of the winding core.

[0054] In this embodiment, the cover plate 120 is made of steel or aluminum and is used to support the first pole 131 and the second pole 132. When the battery cells 100 are welded in groups, the electrical connector is welded to the first pole 131 and the second pole 132 instead of to the cover plate 120. This can avoid the defect of cold welding that is easily caused by welding on the surface of the cover plate in the related art.

[0055] See also Figure 4 The present application also provides a battery pack, including multiple battery cells 100 and an electrical connection assembly as in the above embodiment, wherein the electrical connection assembly is connected to the first pole 131 and the second pole 132 of the multiple battery cells 100. The electrical connection assembly includes multiple electrical connectors 200, and the multiple electrical connectors 200 sequentially connect the multiple battery cells 100 in series or in parallel to form a battery pack.

[0056] In this embodiment, the electrical connector 200 can be a high-voltage aluminum bar or a copper bar. The electrical connector 200 is provided with welding points at both ends along its length direction. The two welding points are respectively welded to the first pole 131 or the second pole 132 of the two adjacent battery cells 100. Since the welding is carried out with the same material and the welding height is the same, the reliability of welding can be improved and the difficulty of welding can be reduced.

[0057] In the battery pack provided in the present embodiment, since the first pole 131 and the second pole 132 are provided on the top of the shell 110, when the multiple battery cells 100 are connected by multiple electrical connectors 200, the electrical connectors 200 are connected to the first pole 131 and the second pole 132, which can improve the stability of the welding process and avoid defective products such as cold welding and welding through that are easy to occur in related technologies.

[0058] This embodiment also provides an electric device, which includes a battery pack as described in the above embodiment. The electric device may be a movable device such as a vehicle or an aircraft. The battery pack may provide power for the electric device. The structure of the battery pack may refer to the description of the above embodiment and will not be repeated here.

[0059] The embodiments of the present application have been described above, and the above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and changes will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments. The selection of terms used herein is intended to best explain the principles of the embodiments, practical applications, or improvements to the technology in the market, or to enable other persons of ordinary skill in the art to understand the embodiments disclosed herein.

Claims

1. A battery cell, characterized in that: include: A shell, wherein a winding core is accommodated inside the shell; A pole structure is provided on the top of the shell, the pole structure includes a first pole and a second pole arranged in parallel, the first pole and the second pole each including a first electrical connection end located outside the shell and a second electrical connection end located inside the shell; The second electrical connection end of the first pole is connected to the positive electrode of the winding core, and the second electrical connection end of the second pole is connected to the negative electrode of the winding core; the first electrical connection ends of the first pole and the second pole are used for welding with the electrical connector outside the battery cell.

2. The battery cell according to claim 1, characterized in that: A cover plate connected to the shell is provided on the top of the shell, and the cover plate is provided with a first pole hole and a second pole hole; The first pole is installed in the first pole hole, the second pole is installed in the second pole hole, and an insulating member is provided between the first pole, the second pole and the cover plate.

3. The battery cell according to claim 1, characterized in that: A terminal assembly is provided on one side of the shell located at the top of the battery cell, and the terminal assembly includes a positive terminal and a negative terminal; the positive terminal and the negative terminal are provided with a pole connecting portion and an electrode connecting portion; The pole connecting portion of the positive terminal is welded to the second electrical connecting end of the first pole, and the pole connecting portion of the negative terminal is in contact with the second electrical connecting end of the second pole; the electrical connecting portion of the positive terminal is connected to the current collecting plate or the adapter plate of the winding core, and the electrical connecting portion of the negative terminal is connected to the negative pole of the winding core or the shell wall of the shell.

4. The battery cell according to claim 2, characterized in that: The distances between the first electrical connection ends of the first pole and the second pole and the cover plate are the same.

5. The battery cell according to claim 1, characterized in that: The shell is cylindrical, the first pole and the second pole are arranged at one axial end of the shell, and the first pole and the second pole are arranged along the diameter direction of the cylinder.

6. The battery cell according to claim 4, characterized in that: The cover plate is made of steel or aluminum.

7. The battery cell according to claim 1, characterized in that: The first pole and the second pole are made of the same material; or The first pole and the second pole are made of aluminum or copper.

8. The battery cell according to claim 4, characterized in that: The distance between the first electrical connection ends of the first pole and the second pole and the cover plate is 1-2 mm.

9. A battery pack, characterized in that: include: A plurality of battery cells according to any one of claims 1 to 8; as well as; An electrical connection assembly is connected to the first poles and the second poles of the plurality of battery cells.

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

Images