Cylindrical battery and battery pack

Abstract

The utility model relates to the technical field of batteries, in particular to a cylindrical battery and a battery pack. According to the cylindrical battery, an accommodating cavity is formed in a shell; the pole group is arranged in the accommodating cavity, and the end part of the pole group is provided with a convex pole lug; the insulating part is arranged on one side, provided with the tabs, of the pole group, and a first through hole for the tabs to extend out is formed in the insulating part; a limiting part extending towards the interior of the accommodating cavity is formed on the shell; and the limiting part can be propped against one side, opposite to the pole group, of the insulating part. The insulating property of the tabs is protected by arranging the insulating parts, and the risk of short circuit of the battery is reduced; and the limiting part can fix the position relationship between the insulating part and the pole group, so that the pole group can be protected to a certain extent, and the insulating property of the cylindrical battery and the structural stability of the battery are improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to battery technology field especially is related to a cylindrical battery and battery package. BACKGROUND

[0002] Lithium ion battery has the advantages of high energy density, long cycle life, safety and environmental protection, etc., which is divided into hard shell battery, soft package battery and cylindrical battery in form. The cylindrical battery is paid attention to due to its high volume energy density, simple structure, easy grouping and standardization. The cylindrical battery includes a shell and a cap, and the closed space surrounded by the shell and the cap is used to accommodate the battery pole group. The pole lug on the pole group is easy to be connected with the metal components on the shell and other batteries, causing short circuit, thereby affecting the safety performance and structural stability of the battery, and further affecting the performance and service life of the battery package, and also easily causing safety problems. SUMMARY

[0003] Therefore, the purpose of the present application is to provide a cylindrical battery and a battery package to solve the problem that the insulation performance of the pole lug in the existing cylindrical battery cannot be guaranteed, thereby affecting the safety performance and structural stability of the battery, and also reducing the performance and service life of the battery package.

[0004] The utility model discloses a cylindrical battery in the first aspect, wherein, including:

[0005] The shell has an accommodating cavity formed inside;

[0006] The pole group is arranged in the accommodating cavity, and the end of the pole group is provided with a protruding pole lug;

[0007] The insulating piece is arranged on the side of the pole group provided with the pole lug, and the insulating piece is provided with a first through hole for the pole lug to protrude out. The limiting portion extending towards the inside of the accommodating cavity is formed on the shell, and the limiting portion can abut against the side of the insulating piece away from the pole group.

[0008] Preferably, the limiting portion is formed in an annular structure, the radial dimension of the inner side wall of the limiting portion is L1, unit: mm, the dimension of the insulating piece in the radial direction of the limiting portion is L2, unit: mm, and 75%≤L1 / L2≤95%; and / or, the side of the limiting portion facing the outside of the shell is provided with a groove.

[0009] Preferably, in the axial direction of the shell, the limiting portion has two U-shaped openings arranged opposite to each other in the axial section.

[0010] Preferably, in the protruding direction of the pole lug, the projection of the first through hole on the pole group covers the pole lug.

[0011] Preferably, the first through hole is formed as a strip-shaped hole; and a length direction of the strip-shaped hole is the same as a width direction of the tab.

[0012] Preferably, the shell has a cylindrical side wall; the insulating piece is formed as a circular plate structure; and the first through hole is curved as an arc, and a central angle of the arc is 60° to 180°.

[0013] Preferably, a center of the arc is coaxially arranged with a center of the insulating piece.

[0014] Preferably, a second through hole is formed on the insulating piece, and the second through hole is arranged at intervals with the first through hole.

[0015] Preferably, a plurality of second through holes are arranged, and the plurality of second through holes are arranged in a line or an array.

[0016] The utility model discloses a second aspect provides a kind of battery pack, including the cylindrical battery of any one of the above technical solutions.

[0017] Compared with prior art, the utility model has the beneficial effects that:

[0018] The cylindrical battery includes a shell having an accommodating cavity formed inside, a pole group arranged in the accommodating cavity, and a tab protruding from an end of the pole group; an insulating piece is arranged on a side of the pole group where the tab is arranged, and a first through hole is formed on the insulating piece for the tab to protrude out, thereby protecting the insulation performance of the tab and reducing the risk of short circuit; a limiting portion is formed on the shell and extends towards the inside of the accommodating cavity, and the limiting portion can abut against a side of the insulating piece away from the pole group, thereby fixing the positional relationship between the insulating piece and the pole group, and thus protecting the pole group to some extent, thereby improving the insulation performance of the cylindrical battery and the stability of the battery structure, and further making the performance of the battery pack meet the use requirements and improving the service life of the battery pack.

[0019] To make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the following preferred embodiments are described in detail below, and the accompanying drawings are described as follows. BRIEF DESCRIPTION OF DRAWINGS

[0020] To more clearly illustrate the specific embodiments of the utility model or the technical solutions in the prior art, the following will briefly introduce the drawings needed to be used in the specific embodiments or prior art description, and obviously, the drawings in the following description are some embodiments of the utility model, and those skilled in the art can also obtain other drawings according to these drawings without creating any creative labor.

[0021] Figure 1 The structure diagram of the cylindrical battery provided by the embodiments of the utility model is shown in the following figure.

[0022] Figure 2 A cross-sectional view of the insulating piece and the pole group assembled in the shell in the cylindrical battery provided by the embodiment of the utility model;

[0023] Figure 3 A plan view of the insulating piece and the pole group assembled in the shell in the cylindrical battery provided by the embodiment of the utility model;

[0024] Figure 4 A cross-sectional view of the limiting part formed on the shell in the cylindrical battery provided by the embodiment of the utility model.

[0025] Icon: 10-shell;100-accommodation cavity;11-limiting part;111-groove;20-pole group;21-tab;30-insulating piece;31-first through hole;32-second through hole;40-cover. DETAILED DESCRIPTION

[0026] The following detailed description is provided to help the reader obtain a thorough understanding of the methods, devices, and / or systems described herein. However, various changes, modifications, and equivalents thereof will become readily apparent to those skilled in the art after an understanding of the disclosure provided herein. For example, the order of the operations described herein is merely an example and does not limit the order of the operations described herein, but, except for operations that must occur in a specific order, changes that will be readily apparent to those skilled in the art after an understanding of the disclosure provided herein can be made. In addition, the description of features known in the art can be omitted in order to improve clarity and brevity.

[0027] The features described herein can be implemented in different forms and should not be construed as being limited to the examples described herein. Rather, the examples described herein have been provided merely to show some of the many ways in which the methods, devices, and / or systems described herein can be implemented after an understanding of the disclosure provided herein.

[0028] Throughout the specification, when an element (such as a layer, a region, or a substrate) is described as "on", "connected to", "bonded to", "on top of", or "covering" another element, it can be directly "on", "connected to", "bonded to", "on top of", or "covering" the other element, or one or more other elements can be present between them. In contrast, when an element is described as "directly on", "directly connected to", "directly bonded to", "directly on top of", or "directly covering" another element, no other elements can be present between them.

[0029] As used herein, the term "and / or" includes any one and any combination of the associated items.

[0030] Although terms such as "first", "second", and "third" can be used herein to describe various elements, components, regions, layers and / or sections, these elements, components, regions, layers and / or sections should not be limited by these terms. Rather, these terms are only used to distinguish one element, component, region, layer or section from another element, component, region, layer or section. Thus, elements, components, regions, layers and / or sections referred to as a first element, component, region, layer or section in the examples described herein can also be referred to as a second element, component, region, layer or section without departing from the teachings of the examples.

[0031] For ease of description, spatial relationship terms, such as "on", "upper", "under", and "lower", can be used herein to describe the relationship between one element and another element as shown in the drawings. Such spatial relationship terms are intended to encompass different orientations of the device in use or operation, in addition to the orientation depicted in the drawings. For example, if the device in the drawings is turned over, an element described as on "upper" or "upper" relative to another element would then be oriented "under" or "lower" relative to the other element. Accordingly, the term "on" encompasses both an "on" and "under" orientation based on the spatial orientation of the device. The device can be oriented in other ways (e.g., rotated 90 degrees or at other orientations) and an appropriate re-interpretation of the spatial relationship terms used herein will be made.

[0032] The terminology used herein is for the purpose of describing various examples only and is not intended to be limiting of the present disclosure. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. The terms "comprises", "comprising", "includes", "including" and "has", "having" as used herein, are specifically intended to be construed as open-ended terms, i.e., to mean "including, but not limited to", "including, but not limited to", "including, but not limited to" and "including, but not limited to", respectively.

[0033] Variations in shapes depicted in the drawings can occur as a result of manufacturing processes and / or tolerances. Thus, the examples described herein are not limited to the specific shapes described herein but include variations in shapes that occur during manufacturing.

[0034] The features of the examples described herein can be combined in a variety of ways as will be apparent after review of the disclosure. Additionally, although various examples have been described herein, it should be understood that other configurations can also be possible.

[0035] The cylindrical battery according to the first aspect of the present application comprises a shell 10, a pole group 20 and an insulating piece 30.

[0036] Hereinafter, the specific structure of the cylindrical battery according to the present embodiment will be described.

[0037] In the present embodiment, as shown in Figure 1 , an accommodating cavity 100 is formed inside the shell 10; the pole group 20 is arranged in the accommodating cavity 100, and the end of the pole group 20 is provided with a protruding tab 21. In the present embodiment, the tab 21 is arranged eccentrically at the end of the pole group 20, i.e., the tab 21 is not collinear with the axis of the pole group 20.

[0038] In the present embodiment, the accommodating cavity 100 comprises at least one opening communicating with the outside of the battery, which can be arranged at one end of the axis of the shell 10 when there is only one opening; when there are multiple openings, at least two openings are arranged at two ends of the axis of the shell 10 opposite to each other.

[0039] In the present embodiment, as shown in Figure 1 , the cylindrical battery further comprises a cover 40, which is connected with the shell 10, specifically, the cover 40 is arranged at the opening of the accommodating cavity 100, so as to realize that the cover 40 and the shell 10 enclose a closed space, thereby protecting the components inside the cylindrical battery.

[0040] In the present embodiment, the shell 10 and the cover 40 are both metal pieces, such as aluminum pieces or steel pieces.

[0041] In order to protect the insulation of the tab 21, in the present embodiment, as shown in Figure 2 and Figure 3 , the insulating piece 30 is arranged on the side of the pole group 20 where the tab 21 is arranged, and the insulating piece 30 is provided with a first through hole 31 through which the tab 21 extends, the first through hole 31 plays a certain guiding role in the extension direction of the tab 21 to avoid short circuit caused by the overlap of the tab 21 and the shell 10, and can also separate the tab 21 and the body of the pole group 20 to avoid the tab 21 being inserted reversely, thereby improving the insulation performance and safety performance of the battery.

[0042] In the present embodiment, the insulating piece 30 can be made of plastic materials, such as PP (polypropylene) or PPS (polyphenylene sulfide) and the like.

[0043] In the present embodiment, the first through hole 31 is a through hole structure penetrating the insulating piece 30 along the protruding direction of the tab 21, i.e., the axis of the first through hole 31 is the same as the length direction of the tab 21.

[0044] Further, in the present embodiment, as shown in Figure 2 and Figure 4As shown, when the insulating member 30 is installed on the side of the electrode assembly 20 where the tabs 21 are provided, a limiting part 11 extending toward the interior of the receiving cavity 100 is formed on the housing 10. The limiting part 11 can abut against the side of the insulating member 30 facing away from the electrode assembly 20, thereby limiting the displacement of the insulating member 30 and the electrode assembly 20 in the receiving cavity 100, thus fixing the positional relationship between the insulating member 30 and the electrode assembly 20. Therefore, it can also protect the electrode assembly 20 to a certain extent, preventing the electrode assembly 20 from moving around in the receiving cavity 100, thereby improving the insulation performance and structural stability of the cylindrical battery.

[0045] Furthermore, in this embodiment, the limiting portion 11 is formed as a ring structure, so that the limiting portion 11 can abut against the circumferential edge of the insulating member 30 on the side away from the pole group 20, thereby achieving effective limiting and preventing the insulating member 30 from warping and affecting the insulation performance. In an optional embodiment, the limiting portion 11 is formed as an integral ring structure; in another optional embodiment, the limiting portion 11 is formed as a ring structure surrounded by a plurality of spaced-apart limiting blocks.

[0046] Preferably, such as Figure 4 As shown, the radial dimension of the inner annular wall of the limiting part 11 is L1, in mm, and the dimension of the insulating part 30 in the radial direction of the limiting part 11 is L2, in mm. 75% ≤ L1 / L2 ≤ 95% is used to avoid the difficulty and high cost of grooving due to the size of L1 being too small, which would affect the structural strength of the housing 10. It also avoids the size of L1 being too large, which would not meet the requirements of the limiting part 11 for fixing the pole group.

[0047] Furthermore, in this embodiment, as Figure 4 As shown, a groove 111 is provided on the side of the limiting part 11 facing the outside of the housing 10. The groove 111 can be in Figure 2 The housing 10 shown is formed by a grooving process, which causes a portion of the housing 10 to deform under the action of rolling. This ensures smooth assembly of the electrode assembly 20 and the insulating component 30, and also facilitates the formation of the limiting part 11. Preferably, the groove 111 is formed as an annular groove surrounding the side wall of the housing 10, which is convenient for grooving machine forming.

[0048] Furthermore, in this embodiment, as Figure 4 As shown, in the axial direction of the housing 10 ( Figure 4 The dotted line shown is the axis of the housing 10. The limiting part 11 has two U-shaped openings arranged opposite each other in the axial section, so that the limiting part 11 forms a reinforcing rib structure on the housing 10, which helps to improve the battery's pressure resistance and leakage prevention performance.

[0049] In this embodiment, as Figure 3As shown, the projection of the first through hole 31 on the pole group 20 covers the tab 21 in the protruding direction of the tab 21 (i.e. the length direction of the tab 21), thus ensuring the tab 21 to pass through the first through hole 31 smoothly without bending, thereby reducing the risk of the tab 21 being lapped with the shell 10 and improving the insulation protection effect of the insulation piece 30 on the tab 21.

[0050] In the preferred embodiments, as shown in the drawings, Figure 3 the first through hole 31 is formed as a strip-shaped hole; the length direction of the strip-shaped hole is the same as the width direction of the tab 21, thus ensuring the tab 21 to pass through the first through hole 31 smoothly and avoiding the tab 21 from being wrinkled when passing through the first through hole 31.

[0051] Further, in the present embodiment, as shown in the drawings, Figure 1 the shell 10 has a cylindrical side wall which is arranged outside the circumferential side wall of the pole group 20; as shown in the drawings, Figure 3 the insulation piece 30 is formed as a circular plate structure, and the first through hole 31 is curved as an arc on the insulation piece 30; preferably, the central angle of the arc is 60° to 180°, preferably 90° to 180°, thus being able to increase the opening area of the first through hole 31 on the limited area of the insulation piece 30 and ensure the tab 21 to pass through smoothly.

[0052] Preferably, the first through hole 31 is formed as a fan-shaped hole structure, and preferably, the fan-shaped first through hole 31 has two arc-shaped hole walls which are arranged opposite to each other, and a planar hole wall which connects the two arc-shaped hole walls, wherein the two planar hole walls are arranged at an angle to each other.

[0053] Preferably, in the present embodiment, as shown in the drawings, Figure 3 the center of the arc is coaxially arranged with the center of the insulation piece 30, thus making the arrangement position of the first through hole 31 on the insulation piece 30 more reasonable, thereby ensuring the tab 21 to pass through smoothly while avoiding the insulation performance of the insulation piece 30 from being affected due to the first through hole 31 being formed on the insulation piece 30.

[0054] In addition, in the present embodiment, as shown in the drawings, Figure 3 the insulation piece 30 is provided with a second through hole 32, and the second through hole 32 is arranged at an interval from the first through hole 31, and the second through hole 32 is used to communicate the pole group 20 and the side of the body of the insulation piece 30 which is away from the pole group 20, so as to facilitate the ventilation of the pole group 20.

[0055] In the preferred embodiments, as shown in the drawings, Figure 3 the second through hole 32 is provided in plurality, so as to improve the ventilation effect of the pole group 20 while ensuring the insulation performance of the insulation piece 30; specifically, the plurality of second through holes 32 are arranged in a linear type or an array on the insulation piece 30, wherein the linear arrangement type can be a straight line type orFigure 3 The curve shape array arrangement shown can be a rectangular array arrangement or a circular array arrangement.

[0056] Preferably, the first through hole 31 and the plurality of second through holes 32 are arranged opposite to each other in the radial direction of the insulating piece 30, and the arrangement shape of the plurality of second through holes 32 is the same as the shape of the first through hole 31, for example, when the first through hole 31 is formed in an arc shape, the plurality of circular second through holes 32 are arranged in an arc shape at intervals, so that the first through hole 31 and the second through hole 32 are uniformly distributed on the insulating piece 30, thereby ensuring the insulation performance of the insulating piece 30.

[0057] In the embodiment, the plurality of second through holes 32 can be through hole structures such as circular or rectangular through the insulating piece 30, and the sizes of different second through holes 32 can be the same or different.

[0058] According to the cylindrical battery provided by the utility model, the insulating piece is arranged on the side of the pole group where the lug is arranged, the first through hole for the lug to extend out is arranged on the insulating piece, so that the insulation performance of the lug is protected, and the risk of short circuit is reduced; the limiting part extending towards the inside of the accommodating cavity is formed on the shell, the limiting part can abut against the side of the insulating piece away from the pole group, so that the positional relationship between the insulating piece and the pole group is fixed, therefore, the pole group can also be protected to a certain extent, so that the insulation performance of the cylindrical battery and the stability of the battery structure are improved.

[0059] According to the battery pack provided by the utility model, the cylindrical battery is arranged in a plurality of modes, the plurality of cylindrical batteries are arranged in series and / or parallel in the shell of the battery pack, and the insulation performance of each cylindrical battery can be guaranteed, so that the safety performance and service life of the battery pack are improved.

[0060] Finally, it should be noted that: the above-described embodiments are merely specific embodiments of the present application, used to illustrate the technical solutions of the present application, rather than limiting them, and the protection scope of the present application is not limited thereto, although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that any person skilled in the art within the technical range disclosed by the present application can modify or easily think of changes to the technical solutions recorded in the foregoing embodiments, or make equivalent replacement to part of the technical features; and these modifications, changes or replacements do not make the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application, and all should be covered in the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A cylindrical battery, characterized by comprising: The application relates to a cylindrical battery. The application relates to a cylindrical battery. The application relates to a cylindrical battery. The application relates to a cylindrical battery.

2. The cylindrical battery according to claim 1, characterized by, The application relates to a cylindrical battery. The application relates to a cylindrical battery.

3. The cylindrical battery according to claim 2, characterized by The application relates to a cylindrical battery.

4. The cylindrical battery according to claim 1, characterized by, The application relates to a cylindrical battery.

5. The cylindrical battery according to claim 1, characterized by, The application relates to a cylindrical battery.

6. The cylindrical battery according to claim 1, characterized by The application relates to a cylindrical battery.

7. The cylindrical battery according to claim 6, characterized by The application relates to a cylindrical battery.

8. The cylindrical battery according to claim 1, wherein The application relates to a cylindrical battery.

9. The cylindrical battery according to claim 8, characterized by The application relates to a cylindrical battery.

10. A battery pack, characterized by, The application relates to a cylindrical battery. The application relates to a cylindrical battery. The application relates to a cylindrical battery. The application relates to a cylindrical battery. The application relates to a cylindrical battery. The application relates to a cylindrical battery. The application relates to a cylindrical battery. The application relates to a cylindrical battery. The application relates to a cylindrical battery. The application relates to a cylindrical battery. The application relates to a cylindrical battery. The application relates to a cylindrical battery. The application relates to a cylindrical battery. The application relates to a cylindrical battery. The application relates to a cylindrical battery. The application relates to a cylindrical battery. The application relates to a cylindrical battery. The application relates to a cylindrical battery. The application relates to a cylindrical battery. The application relates to a cylindrical battery. The application relates to a cylindrical battery. The application relates to a cylindrical battery. The application relates to a cylindrical battery. The application relates to a cylindrical battery. The application relates to a cylindrical battery. The application relates to a cylindrical battery. The application relates to a cylindrical battery. The application relates to a cylindrical battery. The application relates to a cylindrical battery. The application relates to a cylindrical battery. The application relates to a cylindrical battery. The application relates to a cylindrical battery. The application relates to a cylindrical battery. The application relates to a cylindrical battery. The application relates to a cylindrical battery. The application relates to a cylindrical battery. The application relates to a cylindrical battery. The application relates to a cylindrical battery. The application relates to a cylindrical battery. The application relates to a cylindrical battery. The application relates to a cylindrical battery. The application relates to a cylindrical battery. The application relates to a cylindrical battery. The application relates to a cylindrical battery. The application relates to a cylindrical battery. The application relates to a cylindrical battery. The application relates to a cylindrical battery. The application relates to a cylindrical battery. The application relates to a cylindrical battery. The application relates to a cylindrical battery. The application relates to a cylindrical battery. The application relates to a cylindrical battery. The application relates to a cylindrical battery. The application relates to a cylindrical battery. The application relates to a cylindrical battery. The application relates to a cylindrical battery. The application relates to a cylindrical battery. The application relates to a cylindrical battery. The application relates to a cylindrical battery. The application relates to a cylindrical battery. The application relates to a cylindrical battery. The application relates to a cylindrical battery. The application relates to a cylindrical battery. The application relates to a cylindrical battery. The application relates to a cylindrical battery. The application relates to a cylindrical battery. The application relates to a cylindrical battery. The application relates to a cylindrical battery. The application relates to a cylindrical battery. The application relates to a cylindrical battery. The application relates to a cylindrical battery. The application relates to a cylindrical battery. The application relates to a cylindrical battery. The application relates to a cylindrical battery. The application relates to a cylindrical battery. The application relates to a cylindrical battery. The application relates to a cylindrical battery. The application relates to a cylindrical battery. The application relates to a cylindrical battery. The application relates to a cylindrical battery. The application relates to a cylindrical battery. The application relates to a cylindrical battery. The application relates to a cylindrical battery. The application relates to a cylindrical battery. The application relates to a cylindrical battery. The application relates to a cylindrical battery. The application relates to a cylindrical battery. The application relates to a cylindrical battery. The application relates to a cylindrical battery. The application relates to a cylindrical battery. The application relates to a cylindrical battery. The application relates to a cylindrical battery. The application relates to a cylindrical battery. The application relates to a cylindrical battery. The application relates to a cylindrical battery. The application relates to a cylindrical battery. The application relates to a cylindrical battery. The application relates to a cylindrical battery. The application relates to a cylindrical battery. The application relates to a cylindrical battery. The application relates to a cylindrical battery. The application relates to a cylindrical battery. The application relates to a cylindrical battery. The application relates to a cylindrical battery. The application relates to a cylindrical battery. The application relates to

Images