Battery monomer, battery and electric equipment

Abstract

The utility model relates to the technical field of power batteries, in particular to a single battery, a battery and electric equipment, and the single battery comprises an electrode assembly which comprises a first tab and a second tab; the shell is provided with a first opening, the shell comprises a bottom wall, a side wall and a cover plate, the cover plate covers the first opening, the cover plate comprises a cover plate body and a first pole, the cover plate body comprises a step part and a connecting part, the connecting part is connected to the shell and the step part, the step part protrudes out of the connecting part, and the first pole forms an extending part; the first tab is electrically connected with the extension part, and the second tab is electrically connected with the cover plate body. According to the battery monomer provided by the utility model, the structure of the cover plate is optimized, compared with a cover plate of a traditional battery monomer, the battery monomer provided by the invention is provided with the cover plate with a step-shaped structure, and sufficient electric gaps are formed above the cover plate, so that when two adjacent battery monomers are in contact with each other, short circuit caused by lap joint of a chip and the cover plate can be effectively avoided, and the service life of the battery monomer is prolonged. Therefore, the safety of the battery monomer is obviously improved.

Description

Technical Field

[0001] The present application relates to the technical field of power batteries, and in particular to a battery cell, a battery, and an electrical device. Background Art

[0002] At present, in the development process of the existing power battery industry, cylindrical batteries, especially cylindrical batteries, have a wide range of applications due to their relatively low cost and high single-cell energy density. However, the insulation of cylindrical batteries after being placed in the box is always a problem. After being placed in the box, the existing cylindrical batteries are affected by factors such as installation technology and operating conditions. It is easy for adjacent batteries to be close to each other or contact each other, resulting in overlapping short circuits, making it difficult to ensure the safety of the batteries. Utility Model Content

[0003] The purpose of the present application is to provide a battery cell, a battery and an electrical device, so as to solve, to a certain extent, the technical problem in the prior art that adjacent battery cells are prone to overlapping short circuits, thereby affecting battery safety.

[0004] The present application provides a battery cell, comprising: an electrode assembly, comprising a first electrode tab and a second electrode tab of opposite electrical properties;

[0005] A housing having a first opening, the housing comprising a bottom wall and a side wall connected to an edge of the bottom wall, and

[0006] a cover plate, covering the first opening to form a sealed accommodating cavity, the cover plate comprising a cover plate body and a first pole, the cover plate body comprising a step portion and a connecting portion, the outer edge of the connecting portion being circumferentially connected to the housing, the inner edge of the connecting portion being connected to the step portion, the step portion protruding from the connecting portion along a first direction, the step portion having a first surface facing away from the accommodating cavity, a mounting hole being formed on the first surface, a portion of the first pole extending from the mounting hole along the first direction to form a protruding portion, and an insulating member being provided between the first pole and the cover plate;

[0007] The electrode assembly is located in the accommodating cavity, the first electrode tab is electrically connected to the protruding portion, and the second electrode tab is electrically connected to the cover body.

[0008] In the above technical solution, further, the first electrode tab is a positive electrode tab, and the second electrode tab is a negative electrode tab.

[0009] In any of the above technical solutions, further, an insulating film is included, the insulating film covers the side wall and extends to the connecting portion, and the insulating film covers at least a portion of the outer surface of the connecting portion.

[0010] In any of the above technical solutions, further, a pressure relief valve is formed on the bottom wall.

[0011] In any of the above technical solutions, further, the outer edge of the connecting portion is circular.

[0012] In any of the above technical solutions, further, the connecting portion is in a circular ring shape.

[0013] In any of the above technical solutions, further, the connecting portion is provided with a downwardly recessed groove, and the groove extends along the circumference of the connecting portion.

[0014] The present application also provides a battery, comprising a battery cell as described in any of the above technical solutions, and thus having all the beneficial technical effects of the battery cell, which will not be described in detail here.

[0015] The battery further includes a bus bar including a first electrical connection portion and a second electrical connection portion arranged along a second direction, the first electrical connection portion being connected to the first pole of one battery cell, and the second electrical connection portion being connected to the first surface of another battery cell.

[0016] In the above technical solution, further, the busbar also includes a transition portion, which connects the first electrical connection portion and the second electrical connection portion respectively, and the first electrical connection portion is parallel to the second electrical connection portion, and a step is formed between the two.

[0017] The present application also provides an electrical device, comprising the battery cell and battery described in any of the above technical solutions, and thus having all the beneficial technical effects of the above battery cells and batteries, which will not be repeated here.

[0018] Compared with the prior art, the present invention has the following advantages:

[0019] The battery cell provided in the present application includes: an electrode assembly, including a first pole ear and a second pole ear of opposite electrical properties; a shell, having a first opening, the shell including a bottom wall and a side wall connected to the edge of the bottom wall, and a cover plate, covering the first opening to form a sealed accommodating cavity, the cover plate including a cover plate body and a first pole, the cover plate body including a step portion and a connecting portion, the outer edge of the connecting portion is circumferentially connected to the shell, the inner edge of the connecting portion is connected to the step portion, the step portion protrudes from the connecting portion along a first direction, the step portion has a first surface facing away from the accommodating cavity, a mounting hole is opened on the first surface, part of the first pole extends from the mounting hole along the first direction to form an extension portion, and an insulating member is arranged between the first pole and the cover plate; wherein, the electrode assembly is located in the accommodating cavity, the first pole ear is electrically connected to the extension portion, and the second pole ear is electrically connected to the cover plate body.

[0020] The battery cell provided in the present application has a structurally optimized cover plate. Compared with the cover plate of a traditional battery cell, the battery cell of the present application has a cover plate with a stepped structure, and a sufficient electrical gap is formed above the cover plate. When two adjacent battery cells contact each other, it can effectively avoid short circuits caused by overlap between the tabs and the cover plate, thereby significantly improving the safety of the battery cell.

[0021] The present application provides an electrical device, including the battery described in the above embodiment, which has all the beneficial technical effects of the battery and battery cells, and will not be described in detail here. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the specific implementation methods of the present application or the technical solutions in the prior art, the following is a brief introduction to the drawings required for use in the specific implementation methods or the description of the prior art. Obviously, the drawings described below are some implementation methods of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0023] Figure 1 A schematic diagram of the structure of a battery cell provided in an embodiment of the present application;

[0024] Figure 2 for Figure 1 A schematic diagram of the enlarged structure of the battery cell at position M is provided;

[0025] Figure 3 A schematic structural diagram of a battery cell housing provided in an embodiment of the present application;

[0026] Figure 4 A top view of a housing of a battery cell provided in an embodiment of the present application;

[0027] Figure 5 for Figure 4 A schematic diagram of a portion of the structure in a cross-sectional view along AA;

[0028] Figure 6 A schematic structural diagram of a busbar of a battery provided in an embodiment of the present application;

[0029] Figure 7 A schematic diagram of the structure of a battery provided in an embodiment of the present application;

[0030] Figure 8 A schematic structural diagram of the battery bracket provided in an embodiment of the present application.

[0031] Reference numerals:

[0032] 1-shell, 2-cover, 20-cover body, 201-step portion, 202-connecting portion, 203-groove, 21-first pole, 3-bus, 301-first electrical connection portion, 302-second electrical connection portion, 303-transition portion, 4-insulating film, 5-box, 6-bracket, 601-mounting slot. DETAILED DESCRIPTION

[0033] The technical solution of the present application will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments.

[0034] The components of the embodiments of the present application generally described and shown in the drawings herein may be arranged and designed in a variety of different configurations. Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the claimed application, but merely represents selected embodiments of the present application.

[0035] Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making any creative work shall fall within the scope of protection of this application.

[0036] In the description of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate the description of this application and simplify the description. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this application. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0037] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "installed," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on specific circumstances.

[0038] Refer to the following Figures 1 to 8 The present invention describes a battery cell, a battery, and an electric device according to embodiments of the present application.

[0039] See also Figures 1 to 5As shown, an embodiment of the present application provides a battery cell, which includes: an electrode assembly and a shell 1, wherein the electrode assembly includes a first pole lug and a second pole lug with opposite polarities. Preferably, the first pole lug is a positive pole lug and the second pole lug is a negative pole lug. The cover plate 2 specifically includes a cover plate body 20 and a first pole 21. The cover plate body 20 includes a step portion 201 and a connecting portion 202. The outer edge of the connecting portion 202 is circumferentially connected to the shell 1, and the inner edge of the connecting portion 202 is connected to the step portion 201. Preferably, the connecting portion 202 has an annular structure, and at least the outer edge of the connecting portion 202 is circular. More preferably, the connecting portion 202 is annular, and both the outer ring edge and the inner ring edge of the connecting portion 202 are circular. The step portion 201 protrudes from the connecting portion toward the outside of the shell 1 along a first direction. It should be noted that the first direction is specifically the height direction of the present battery cell.

[0040] Specifically, in this embodiment, the housing 1 is cylindrical and includes a bottom wall and side walls disposed on the bottom wall. Preferably, the bottom wall and side walls of the housing 1 are integrally formed. An end of the housing 1 away from the bottom wall is open as a first opening, and the cover 2 covers the first opening, thereby forming a sealed accommodating chamber within the housing 1. The surface of the step portion 201 facing away from the accommodating chamber is a first surface. A mounting hole is defined on the first surface of the step portion 201. The first pole 21 is disposed through the mounting hole, and a portion of the first pole 21 protrudes a certain height relative to the first surface of the step portion 201 to form a protruding portion.

[0041] The electrode assembly is disposed in the cavity, the first electrode tab is electrically connected to the extension portion, and the second electrode tab is electrically connected to the cover body 20, so that the battery cell can supply power to the outside.

[0042] It should be noted that an insulating member is provided between the first pole 21 and the cover plate 2 .

[0043] Preferably, the first pole 21, the step portion 201 and the connecting portion 202 are coaxially arranged. In this embodiment, the first pole 21 serves as the positive electrode of the battery cell, and the area surrounding the first pole 21 by the step portion 201 serves as the negative electrode of the battery cell.

[0044] Furthermore, the connecting portion 202 is provided with a groove 203 recessed toward the accommodating cavity. The groove 203 is specifically provided in the portion of the connecting portion 202 surrounding the step portion 201, and the groove 203 extends along the circumference of the connecting portion 202. The groove 203 can be a welding space between the connecting portion 202 and the bus 3 described below.

[0045] Furthermore, the battery cell also includes an insulating film 4, which covers the side wall of the shell 1. When multiple shells 1 are arranged in sequence, the insulating film 4 can prevent two adjacent shells 1 from contacting each other, thereby avoiding short circuits and the like.

[0046] Furthermore, the insulating film 4 extends to the connecting portion 202, covering the sidewalls of the housing 1 and at least a portion of the outer surface of the connecting portion 202. At the end of the housing 1 where the cover plate 2 is provided, the lower layer of the stepped structure formed by the step portion 201 and the connecting portion 202 is covered by the insulating film 4. When one or both of the two adjacent housings 1 fall and approach each other, the contact range and contact position between the two change, resulting in contact between the housings 1 and the connecting portion 202, or between the connecting portions 202 and the connecting portions 202. However, due to the separating effect of the insulating film 4, the negative electrodes of the two housings 1 will not overlap and cause a short circuit.

[0047] Furthermore, a pressure relief valve is provided on the bottom wall of the housing 1 , and when thermal runaway occurs in the battery cell, the pressure relief valve opens to release the heat and pressure in the housing 1 .

[0048] To sum up, the battery cell provided in the present application has a structurally optimized cover plate 2. Compared with the cover plate 2 of the traditional battery cell, the battery cell of the present application has a cover plate 2 with a stepped structure, and a sufficient electrical gap is formed above the cover plate 2. When two adjacent battery cells contact each other, it can effectively avoid short circuits caused by overlap between the bar and the cover plate 2, thereby significantly improving the safety of the battery cell.

[0049] See also Figure 7 and Figure 8 As shown, an embodiment of the present application further provides a battery, comprising the battery cell described in any of the above embodiments, and thus having all the beneficial technical effects of the battery cell, which will not be described in detail here.

[0050] Furthermore, the battery includes a plurality of battery cells arranged in a matrix. The battery also includes a bus bar 3, and the number of bus bars 3 is multiple. The shells 1 of two adjacent battery cells are connected by a bus bar 3, thereby realizing the series connection of the two shells 1. Specifically, the bus bar 3 includes a first electrical connection portion 301, a transition portion 303, and a second electrical connection portion 302 arranged in sequence along the second direction. The first electrical connection portion 301 and the second electrical connection portion 302 are connected by the transition portion 303. Preferably, the first electrical connection portion 301, the transition portion 303, and the second electrical connection portion 302 have an integrated structure. The first electrical connection portion 301 of each bus bar 3 is used to connect to the first pole 21 of one battery cell, and the second electrical connection portion 302 of each bus bar 3 is used to connect to the first surface of another battery cell, thereby realizing the series connection of the two shells 1.

[0051] Specifically, the first electrical connection portion 301 and the second electrical connection portion 302 are arranged in parallel, but are not in the same plane, so that a step is formed at the transition portion 303. The two adjacent housings 1 are defined as a first housing and a second housing, respectively. The first electrical connection portion 301 of the busbar 3 is connected to the first pole 21 of the first housing 1, and the connection method may be, but is not limited to, welding. The second electrical connection portion 302 of the same busbar 3 is connected to the connection portion 202 of the second housing 1, and the connection method may be, but is not limited to, welding. Because the transition portion 303 is provided between the first electrical connection portion 301 and the second electrical connection portion 302, the first electrical connection portion 301 does not contact the step portion 201 of the second housing 1. An electrical gap is formed between the first electrical connection portion 301 and the step portion 201, effectively preventing self-short circuits.

[0052] Furthermore, as described above, the connecting portion 202 is provided with a groove 203, which provides a welding space for the welding foot when the second electrical connecting portion 302 and the connecting portion 202 are welded, thereby preventing the welding area between the bus 3 and the connecting portion 202 from being too narrow, thereby making the welding position flat and ensuring the welding strength between the bus 3 and the connecting portion 202.

[0053] Furthermore, the battery also includes a housing 5 and a bracket 6. The bracket 6 is disposed within the housing 5 and is used to accommodate the aforementioned multiple battery cells. Furthermore, the bracket 6 is provided with multiple mounting slots 601, which are arranged in a matrix pattern. Each mounting slot 601 houses a battery cell. The multiple mounting slots 601 not only secure the multiple battery cells, ensuring their stability within the housing 5, but also position the battery cells. After the multiple battery cells are installed, the return bus can be welded to the positive and negative electrodes of the battery cells without requiring secondary positioning during welding. Combined with improvements to the structure of the busbar 3, this effectively reduces the difficulty of welding the output electrode to the busbar 3, reduces the number of welding steps, reduces assembly costs, and significantly improves the safety of the battery.

[0054] The battery provided in the present application significantly reduces the risk of overlapping short circuits between two adjacent battery cells, thereby improving the battery's ability to cope with special working conditions and significantly improving the safety performance of the battery.

[0055] The embodiments of the present application also provide an electrical device, comprising the battery described in the above embodiments, and thus having all the beneficial technical effects of the battery and being able to improve the safety factor of the electrical device.

[0056] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A battery cell, characterized in that: include: An electrode assembly comprising a first electrode tab and a second electrode tab of opposite electrical properties; A housing having a first opening, the housing comprising a bottom wall and a side wall connected to an edge of the bottom wall, and a cover plate, covering the first opening to form a sealed accommodating cavity, the cover plate comprising a cover plate body and a first pole, the cover plate body comprising a step portion and a connecting portion, the outer edge of the connecting portion being circumferentially connected to the housing, the inner edge of the connecting portion being connected to the step portion, the step portion protruding from the connecting portion along a first direction, the step portion having a first surface facing away from the accommodating cavity, a mounting hole being formed on the first surface, a portion of the first pole extending from the mounting hole along the first direction to form a protruding portion, and an insulating member being provided between the first pole and the cover plate; The electrode assembly is located in the accommodating cavity, the first electrode tab is electrically connected to the protruding portion, and the second electrode tab is electrically connected to the cover body.

2. The battery cell according to claim 1, wherein: The first electrode tab is a positive electrode tab, and the second electrode tab is a negative electrode tab.

3. The battery cell according to claim 1, wherein: An insulating film is included, the insulating film covers the sidewall and extends to the connecting portion, and the insulating film covers at least a portion of an outer surface of the connecting portion.

4. The battery cell according to claim 3, characterized in that A pressure relief valve is formed on the bottom wall.

5. The battery cell according to claim 3, characterized in that: The outer edge of the connecting portion is circular.

6. The battery cell according to claim 5, characterized in that The connecting portion is in a circular ring shape.

7. The battery cell according to claim 6, characterized in that The connecting portion is provided with a downwardly recessed groove, and the groove extends along the circumference of the connecting portion.

8. A battery, characterized in that: include: A busbar and a plurality of battery cells as described in any one of claims 1 to 7; the busbar includes a first electrical connection portion and a second electrical connection portion arranged along a second direction, the first electrical connection portion is connected to the first pole of one of the battery cells, and the second electrical connection portion is connected to the first surface of another of the battery cells.

9. The battery according to claim 8, characterized in that The busbar further includes a transition portion, which connects the first electrical connection portion and the second electrical connection portion respectively. The first electrical connection portion is parallel to the second electrical connection portion, and a step is formed therebetween.

10. An electrical device, characterized in that: A battery comprising the battery according to claim 8 or 9.

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