CN219534814U - Cylindrical battery and battery pack - Google Patents

Cylindrical battery and battery pack Download PDF

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Publication number
CN219534814U
CN219534814U CN202320502441.6U CN202320502441U CN219534814U CN 219534814 U CN219534814 U CN 219534814U CN 202320502441 U CN202320502441 U CN 202320502441U CN 219534814 U CN219534814 U CN 219534814U
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China
Prior art keywords
tab
battery
cylindrical
cell
tabs
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CN202320502441.6U
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Chinese (zh)
Inventor
孙倩倩
齐彬伟
张璐璐
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China Innovation Aviation Technology Group Co ltd
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China Innovation Aviation Technology Group Co ltd
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Priority to CN202320502441.6U priority Critical patent/CN219534814U/en
Priority to DE202023102871.3U priority patent/DE202023102871U1/en
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/10—Primary casings; Jackets or wrappings
    • H01M50/102—Primary casings; Jackets or wrappings characterised by their shape or physical structure
    • H01M50/107—Primary casings; Jackets or wrappings characterised by their shape or physical structure having curved cross-section, e.g. round or elliptic
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/531—Electrode connections inside a battery casing
    • H01M50/533—Electrode connections inside a battery casing characterised by the shape of the leads or tabs
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Battery Mounting, Suspending (AREA)
  • Connection Of Batteries Or Terminals (AREA)
  • Sealing Battery Cases Or Jackets (AREA)

Abstract

The utility model relates to the technical field of batteries, and provides a cylindrical battery and a battery pack. The cylindrical battery comprises a battery core, wherein the battery core comprises a battery core main body and a first tab, the first tab extends from one side of the battery core main body and comprises a plurality of single-sheet tabs, and the ratio of the thickness of the single-sheet tabs to the radius of the battery core is 0.1 multiplied by 10 ‑3 ‑0.75×10 ‑3 The diameter of the battery cell is more than or equal to 40mmThe battery cell can ensure the energy density of the battery cell, and reduce the risk of tearing between single-chip tabs, thereby improving the safe use performance of the cylindrical battery.

Description

Cylindrical battery and battery pack
Technical Field
The utility model relates to the technical field of batteries, in particular to a cylindrical battery and a battery pack.
Background
In the related art, the lug of the battery core can be formed by folding a plurality of single-chip lugs, in the process, the single-chip lugs are bent, kneaded and the like, along with the increase of the thickness of the battery core, the stress to which the outer-ring single-chip lugs are bent is larger, and the extrusion fracture risk of the inner-ring single-chip lugs to which the multi-layer outer-ring single-chip lugs are subjected is larger, so that the overall charge and discharge rate of the battery is influenced.
Disclosure of Invention
The utility model provides a cylindrical battery and a battery pack, which are used for improving the service performance of the cylindrical battery.
According to a first aspect of the present utility model, there is provided a cylindrical battery comprising a battery cell including a battery cell main body and a first tab extending from one side of the battery cell main body, the first tab including a plurality of single-piece tabs having a thickness to radius ratio of 0.1×10 -3 -0.75×10 -3 The diameter of the battery cell is more than or equal to 40mm.
The cylindrical battery of the embodiment of the utility model comprises a battery core, wherein the battery core comprises a battery core main body and a first tab formed by folding and connecting a plurality of single-piece tabs, and the ratio of the thickness of the single-piece tab to the radius of the battery core is 0.1 multiplied by 10 -3 -0.75×10 -3 The diameter of the battery core is more than or equal to 40mm, so that the energy density of the battery core can be ensured, and the risk of tearing between single-chip tabs can be reduced, thereby improving the safety usability of the cylindrical battery.
According to a second aspect of the present utility model, there is provided a battery pack comprising the above-described cylindrical battery.
The cylindrical battery of the battery pack of the embodiment of the utility model comprises a battery core, wherein the battery core comprises a battery core main body and a first tab formed by folding and connecting a plurality of single-sheet tabs, and the ratio of the thickness of the single-sheet tab to the radius of the battery core is 0.1 multiplied by 10 -3 -0.75×10 -3 The diameter of the battery cell is more than or equal to 40mm, so that the energy density of the battery cell can be ensured, and the risk of tearing between single-chip tabs can be reduced, thereby improving the safety use performance of the battery pack.
Drawings
For a better understanding of the present disclosure, reference may be made to the embodiments illustrated in the following drawings. The components in the drawings are not necessarily to scale and related elements may be omitted in order to emphasize and clearly illustrate the technical features of the present disclosure. In addition, the relevant elements or components may have different arrangements as known in the art. Furthermore, in the drawings, like reference numerals designate identical or similar parts throughout the several views.
Wherein:
fig. 1 is a schematic view showing a structure of a cylindrical battery according to an exemplary embodiment;
fig. 2 is a schematic view showing an internal structure of a cylindrical battery according to an exemplary embodiment;
fig. 3 is a schematic view showing an internal structure of a cylindrical battery according to another exemplary embodiment;
fig. 4 is a schematic view showing the structure of a pole piece of a cylindrical battery according to an exemplary embodiment;
fig. 5 is a schematic structural view of a battery cell of a cylindrical battery according to another exemplary embodiment;
fig. 6 is a schematic structural view of a cylindrical battery according to another exemplary embodiment;
fig. 7 is a schematic view illustrating a structure of a battery pack according to an exemplary embodiment.
The reference numerals are explained as follows:
10. a battery case; 20. a battery cell; 21. a cell body; 22. a first tab; 221. a single tab; 23. a second lug; 24. a pole piece; 30. a pole structure; 40. a first conductive bar; 50. a second conductive bar; 60. a bottom plate.
Detailed Description
The technical solutions in the exemplary embodiments of the present disclosure will be clearly and completely described below with reference to the accompanying drawings in the exemplary embodiments of the present disclosure. The example embodiments described herein are for illustrative purposes only and are not intended to limit the scope of the present disclosure, and it is therefore to be understood that various modifications and changes may be made to the example embodiments without departing from the scope of the present disclosure.
In the description of the present disclosure, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying relative importance unless explicitly specified or limited otherwise; the term "plurality" refers to two or more than two; the term "and/or" includes any and all combinations of one or more of the associated listed items. In particular, references to "the/the" object or "an" object are likewise intended to mean one of a possible plurality of such objects.
Unless specified or indicated otherwise, the terms "connected," "fixed," and the like are to be construed broadly and are, for example, capable of being fixedly connected, detachably connected, or integrally connected, electrically connected, or signally connected; "coupled" may be directly coupled or indirectly coupled through intermediaries. The specific meaning of the terms in the present disclosure may be understood by those skilled in the art according to the specific circumstances.
Further, in the description of the present disclosure, it should be understood that the terms "upper", "lower", "inner", "outer", and the like, as described in the example embodiments of the present disclosure, are described with the angles shown in the drawings, and should not be construed as limiting the example embodiments of the present disclosure. It will also be understood that in the context of an element or feature being connected to another element(s) "upper," "lower," or "inner," "outer," it can be directly connected to the other element(s) "upper," "lower," or "inner," "outer," or indirectly connected to the other element(s) "upper," "lower," or "inner," "outer" via intervening elements.
Referring to fig. 1 to 6, an embodiment of the present utility model provides a cylindrical battery, wherein the cylindrical battery includes a battery cell 20, the battery cell 20 includes a battery cell main body 21 and a first tab 22, the first tab 22 extends from one side of the battery cell main body 21, the first tab 22 includes a plurality of single-piece tabs 221, and a ratio of a thickness of the single-piece tab 221 to a radius of the battery cell 20 is 0.1x10 -3 -0.75×10 -3 The diameter of the battery cell 20 is more than or equal to 40mm.
Cylindrical electric according to one embodiment of the present utility modelThe battery comprises a battery core 20, wherein the battery core 20 comprises a battery core main body 21 and a first tab 22 formed by folding and connecting a plurality of single-piece tabs 221, and the ratio of the thickness of the single-piece tab 221 to the radius of the battery core 20 is 0.1 multiplied by 10 -3 -0.75×10 -3 The diameter of the battery core 20 is more than or equal to 40mm, so that the energy density of the battery core 20 can be ensured, and the risk of tearing between the single-chip tabs 221 can be reduced, thereby improving the safe use performance of the cylindrical battery.
It should be noted that, the diameter of the cell 20 is greater than or equal to 40mm, so that the cell 20 can have a reliable capacity, and the ratio of the thickness of the single tab 221 to the radius of the cell 20 is 0.1X10 -3 -0.75×10 -3 . The ratio of the thickness of the single-chip lugs 221 to the radius of the battery core 20 is too small, the whole relative area of the first lugs 22 of the large-diameter battery core 20 is larger, the thickness of the single-chip lugs 221 is thinner, the tearing between the single-chip lugs 221 is larger, and the fracture risk of the first lugs 22 is larger; the ratio of the thickness of the single tab 221 to the radius of the battery cell 20 is too large, so that the single tab 221 occupies a relatively large area to affect the overall energy density of the battery cell 20, and the thickness of the single tab 221 is relatively thick, so that the overall welding of the first tab 22 is difficult, and the risk of cold welding between the single tabs 221 exists.
After the battery core 20 is wound, the plurality of single-piece tabs 221 need to be folded and bent, which can ensure the connection capability between the single-piece tabs 221 and facilitate the subsequent connection with the electrode lead-out structure, for example, the electrode lead-out structure can be the battery case 10, the adapter piece or the pole post structure 30, and the like. The outer ring single-chip tab 221 of the battery cell 20 is bent and subjected to larger stress, and the inner ring single-chip tab 221 is subjected to larger extrusion fracture risk of the multi-layer outer ring single-chip tab 221, so in the embodiment, the energy density of the battery cell 20 can be effectively ensured and the risk of tearing between the single-chip tabs 221 can be reduced by controlling the ratio of the thickness of the single-chip tab 221 to the radius of the battery cell 20.
The first tab 22 includes a plurality of single-piece tabs 221, the single-piece tabs 221 may be arranged at intervals, that is, the first tab 22 may be of a non-full tab structure, for example, a plurality of empty foil areas arranged at intervals are led out from one pole piece, after the pole piece is wound, the plurality of empty foil areas are folded and connected to form the single-piece tab 221, and the thickness of the single-piece tab 221 is actually the thickness of the empty foil area; alternatively, the plurality of single tabs 221 are connected, i.e., the first tab 22 may be a full tab structure, where the plurality of single tabs 221 are actually the number of tab layers along the radial direction of the cell 20.
In one embodiment, the ratio of the thickness of the single tab 221 to the radius of the cell 20 is 0.15X10 -3 -0.5×10 -3 On the basis of reducing the tearing risk between the single-chip tabs 221, the energy density of the battery core 20 can be further ensured, so that the overall structural performance of the cylindrical battery is improved.
In one embodiment, the ratio of the thickness of the monolithic tab 221 to the radius of the cell 20 may be 0.1X10 -3 、0.11×10 -3 、0.12×10 -3 、0.13×10 -3 、0.14×10 -3 、0.15×10 -3 、0.16×10 -3 、0.18×10 -3 0.2X10 g -3 、0.24×10 -3 、0.25×10 -3 、0.26×10 -3 、0.28×10 -3 、0.3×10 -3 、0.34×10 -3 、0.35×10 -3 、0.4×10 -3 、0.41×10 -3 、0.45×10 -3 、0.48×10 -3 、0.49×10 -3 、0.5×10 -3 、0.51×10 -3 、0.55×10 -3 、0.58×10 -3 、0.59×10 -3 、0.6×10 -3 、0.61×10 -3 、0.62×10 -3 、0.65×10 -3 、0.68×10 -3 、0.69×10 -3 、0.7×10 -3 Or 0.75X10 -3 Etc. In one embodiment, the diameter of the battery cell 20 may range from 40mm to 80mm, so that the overall energy density of the battery cell 20 can be ensured, and the risk of tearing due to high pressure applied to the inner single tab 221 can be avoided.
When the diameter of the battery cell 20 is too small, the overall energy density of the cylindrical battery is low, and the capacity of the cylindrical battery is difficult to develop; the diameter of the battery core 20 is too large, the diameter of the cylindrical battery is larger, the overall thickness of the first tab 22 is relatively large, the pressure applied to the inner single tab is large, and the risk of tearing the single tab exists.
The diameter of the cells 20 may be 40mm, 45mm, 50mm, 55mm, 60mm, 65mm, 70mm, 75mm, 80mm, or the like.
In one embodiment, the thickness of the single tab 221 is greater than or equal to 4.5 μm, which can ensure the structural strength of the single tab 221 and the overcurrent capability of the first tab 22 formed later.
The thickness of the single tab 221 may be 15 μm or less, for example, the thickness of the single tab 221 may be 4.5 μm, 5 μm, 6 μm, 7 μm, 7.5 μm, 8 μm, 8.5 μm, 9 μm, 9.5 μm, 10 μm, 11 μm, 12 μm, 12.5 μm, 13 μm, 13.5 μm, 14 μm, 14.5 μm, 15 μm, or the like.
In one embodiment, the first tab 22 includes a plurality of tab layers in a radial direction of the cell body 21, each tab layer including at least one single tab 221; the number of the tab layers is less than or equal to 100, so that on the basis of ensuring the overcurrent capacity of the first tab 22, the tearing risk between the single tabs 221 can be reduced, and the safe service performance of the cylindrical battery is improved.
In one embodiment, the first tab 22 includes a plurality of tab layers in a radial direction of the cell body 21, each tab layer including at least one single tab 221; the number of the tab layers can be more than or equal to 20, so that the current transmission capacity of the first tab 22 can be effectively improved, and the service performance of the cylindrical battery is improved.
The diameter of the winding type battery cell 20 is more than or equal to 40mm, and the number of the plurality of tab layers is more than or equal to 20, so that the heat of the winding type battery cell 20 can be ensured, the current transmission capacity of the first tab 22 can be ensured, and the service performance of the cylindrical battery can be reliably improved.
In one embodiment, the first tab 22 includes a plurality of tab layers in a radial direction of the cell body 21, each tab layer including at least one single tab 221; the number of the plurality of tab layers is equal to or greater than 20, and the number of the plurality of tab layers is equal to or less than 100, so that the tearing risk between the single tabs 221 can be effectively reduced, and the current transmission capability of the first tab 22 can be ensured.
In one embodiment, the plurality of single-chip tabs 221 are arranged at intervals along the winding direction of the battery core 20, so that the problems of overlapping and wrinkling of the single-chip tabs 221 and the like in the folding process of the single-chip tabs 221 can be prevented, the overall surface flatness of the first tab 22 is higher, and the subsequent welding capability of the first tab 22 is improved.
The plurality of single tabs 221 are arranged at intervals along the winding direction of the battery cell 20, and can be considered as: as shown in fig. 4, the plurality of single tabs 221 may be extended from the pole piece 24 at intervals, and after winding the pole piece 24 with the other pole piece having the opposite polarity, the plurality of single tabs 221 are folded and bent, so that the first tab 22 shown in fig. 5 may be formed.
In one embodiment, as shown in fig. 2, the battery cell 20 further includes a second tab 23, the polarities of the first tab 22 and the second tab 23 are opposite, the first tab 22 and the second tab 23 extend from the same end of the battery cell main body 21, and the first tab 22 and the second tab 23 are spaced apart, so as to ensure insulation between the first tab 22 and the second tab 23, and avoid a short circuit problem.
The polarities of the first tab 22 and the second tab 23 are opposite, one of the first tab 22 and the second tab 23 is a positive tab, and the other is a negative tab, and the first tab 22 and the second tab 23 extend from the same side of the battery cell main body 21, so that the problem of excessive accumulation of height space caused by the extension of the first tab 22 and the second tab 23 from the opposite sides of the battery cell main body 21 can be avoided.
In one embodiment, as shown in fig. 3, the battery cell 20 further includes a second tab 23, the polarities of the first tab 22 and the second tab 23 are opposite, the first tab 22 and the second tab 23 extend from opposite ends of the battery cell main body 21, so that not only the electron transmission path is shortest, the transmission rate is fast, but also the heat generation is low, thereby improving the safety performance of the battery, and reducing the fracture risk of the first tab 22 and the second tab 23.
The first tab 22 includes a plurality of single-piece tabs 221, and correspondingly, the second tab 23 may also include a plurality of single-piece tabs, which are not described herein.
In one embodiment, the first tab 22 is a positive tab, the second tab 23 is a negative tab, the cylindrical battery further includes a battery housing 10 and a post structure 30, the post structure 30 is disposed on the battery housing 10, the battery core 20 is disposed in the battery housing 10, the first tab 22 is connected with the post structure 30, i.e. the positive tab can extend toward the top of the cylindrical battery, and the negative tab can extend toward the bottom of the cylindrical battery, so that the risk of the first tab 22 and the second tab 23 breaking can be reduced to a certain extent.
The first tab 22 is aluminum foil, the second tab 23 is copper foil, and the aluminum foil is weaker than the copper foil in strength, so that the bottom is severely pulled through the copper foil, the copper foil strength is high, and the fracture risk is reduced.
In one embodiment, the second tab 23 is electrically connected to the battery case 10, so that the battery case 10 can be used as an electrode lead-out terminal of a cylindrical battery, so that the subsequent grouping of the cylindrical batteries is facilitated, and the number of components of the cylindrical battery can be reduced, thereby improving the service performance of the battery.
It should be noted that, one of the first tab 22 and the second tab 23 is electrically connected to the battery case 10, and the other is electrically connected to the post structure 30, for example, the first tab 22 and the battery case 10 may be directly welded, or the second tab 23 and the battery case 10 may be connected to each other through a current collecting disc; correspondingly, the first tab 22 and the pole structure 30 may be directly welded, or the first tab 22 and the pole structure 30 may be connected by a connection piece.
In one embodiment, as shown in fig. 6, the cylindrical battery further includes a first conductive strip 40 and a second conductive strip 50, the first conductive strip 40 is electrically connected with the battery case 10, and the second conductive strip 50 is electrically connected with the pole structure 30, so that the cylindrical battery can be used to form an electrical connection with other cylindrical batteries through the first conductive strip 40 and the second conductive strip 50, thereby making a grouping of the cylindrical batteries.
In one embodiment, as shown in fig. 6, the first conductive bar 40 and the second conductive bar 50 are located at the same side of the battery case 10, so that space utilization of the cylindrical batteries can be improved and grouping of the cylindrical batteries can also be facilitated.
In one embodiment, the first conductive strip 40 and the second conductive strip 50 may be located on opposite sides of the battery case 10 to accommodate the installation and spatial arrangement of the cylindrical batteries.
In one embodiment, the lengths of the plurality of single-chip tabs 221 along the extraction direction are consistent, so that the single-chip tabs 221 can be conveniently formed, and the manufacturing efficiency of the cylindrical battery can be improved.
In one embodiment, the first tab 22 includes a tab area, and the tab area includes a plurality of single tabs 221 with different lengths along the leading-out direction of the single tabs 221, so that the flatness of the first tab 22 can be ensured as much as possible when the single tabs 221 are folded to form the first tab 22.
The lengths of the single-chip tabs 221 in the tab area are gradually increased along the radial direction of the battery core main body 21, so that the probability that the single-chip tabs 221 block the core winding hole of the battery core main body 21 can be reduced, and the flatness of the first tab 22 can be optimized after the single-chip tabs 221 are folded and connected.
The first tab 22 includes a tab area, and the tab area may include a plurality of tab layers along a radial direction of the battery core main body 21, where a length dimension of each single tab 221 in the tab layers after being straightened gradually increases from a tab layer close to a core winding hole of the battery core main body 21 to a tab layer far away from the core winding hole of the battery core main body 21, for example, each tab layer includes a single tab 221, straightens the single tab 221 of each layer, and then the plurality of single tabs 221 gradually increases along the radial direction of the battery core main body 21, where it is possible that each single tab 221 forms a gradually increasing trend, and certainly, it is not excluded that lengths of some adjacent single tabs 221 are consistent, but an overall trend gradually increases.
It should be noted that, the radial direction of the cell main body 21 may be denoted as a, the radial direction of the cell main body 21 is a direction extending outward from the center point of the cell main body 21, the radial directions of the cell main bodies 21 are plural, and only the radial direction a of four cell main bodies 21 is shown in fig. 5.
An embodiment of the present utility model also provides a battery pack including the above cylindrical battery.
The cylindrical battery of the battery pack according to one embodiment of the present utility model comprises a battery cell 20, wherein the battery cell 20 comprises a battery cell main body 21 and a first tab 22 formed by folding and connecting a plurality of single-piece tabs 221, and the ratio of the thickness of the single-piece tab 221 to the radius of the battery cell 20 is 0.1×10 -3 -0.75×10 -3 The diameter of the battery cell 20 is more than or equal to 40mm, so that the energy density of the battery cell 20 can be ensured, and the risk of tearing between the single-chip tabs 221 can be reduced, thereby improving the safety use performance of the battery pack.
In one embodiment, the battery pack is a battery module or a battery pack.
The battery module includes a plurality of cylindrical batteries, and the battery module can also include the bracket, and the battery can be fixed in on the bracket.
The battery pack comprises a plurality of cylindrical batteries and a box body, wherein the box body is used for fixing the plurality of cylindrical batteries.
It should be noted that, the battery pack includes a plurality of cylindrical batteries, and the plurality of cylindrical batteries are disposed in the case. Wherein, a plurality of cylinder batteries can be installed in the box after forming the battery module. Or, a plurality of cylindrical batteries can be directly arranged in the box body, namely, the plurality of cylindrical batteries do not need to be grouped, and the plurality of cylindrical batteries are fixed by the box body.
The number of cylindrical batteries may be plural, the plurality of cylindrical batteries may form a battery pack, the plurality of cylindrical batteries may be electrically connected by the first conductive bar 40 and the second conductive bar 50, for example, when the plurality of cylindrical batteries may be connected in series, the first conductive bar 40 may be connected with the post structure 30 of the first cylindrical battery and with the battery case 10 of the second cylindrical battery, while the second conductive bar 50 may be connected with the battery case of the first cylindrical battery, and the second conductive bar 50 may be connected with the post structure 30 of the third cylindrical battery.
The first conductive strip 40 may be welded to the battery housing 10 of the cylindrical battery and the second conductive strip 50 may be welded to the post structure 30 of the cylindrical battery.
The number of the conductive bars and the specific structure are not limited, and can be selected according to actual requirements, and correspondingly, the number of the cylindrical batteries is not limited, and the plurality of cylindrical batteries can be connected in parallel, or the plurality of cylindrical batteries can be connected in series.
In one embodiment, as shown in fig. 7, the battery pack includes a bottom plate 60, the cylindrical battery is disposed on the bottom plate 60, the first tab 22 and the second tab 23 of the battery core 20 extend from opposite ends of the battery core main body 21, the first tab 22 is a positive tab, the second tab 23 is a negative tab, and the negative tab is disposed towards the bottom plate 60, so that the first tab 22 and the second tab 23 can be prevented from being broken during the use of the battery pack, and the safe use performance of the cylindrical battery is improved.
The bottom plate 60 may be a bracket, or the bottom plate 60 may be a box, which is not limited herein.
Other embodiments of the disclosure will be apparent to those skilled in the art from consideration of the specification and practice of the utility model disclosed herein. This disclosure is intended to cover any variations, uses, or adaptations of the utility model following, in general, the principles of the disclosure and including such departures from the present disclosure as come within known or customary practice within the art to which the disclosure pertains. The specification and example embodiments are to be considered exemplary only, with a true scope and spirit of the disclosure being indicated by the following claims.
It is to be understood that the present disclosure is not limited to the precise arrangements and instrumentalities shown in the drawings, and that various modifications and changes may be effected without departing from the scope thereof. The scope of the present disclosure is limited only by the appended claims.

Claims (12)

1. The cylindrical battery is characterized by comprising a battery cell (20), wherein the battery cell (20) comprises a battery cell main body (21) and a first tab (22), the first tab (22) extends from one side of the battery cell main body (21), the first tab (22) comprises a plurality of single-piece tabs (221), and the ratio of the thickness of the single-piece tabs (221) to the radius of the battery cell (20) is 0.1 multiplied by 10 -3 -0.75×10 -3 The diameter of the battery cell (20) is more than or equal to 40mm.
2. The cylindrical battery according to claim 1, wherein the ratio of the thickness of the single tab (221) to the radius of the cell (20) is 0.15 x 10 -3 -0.5×10 -3 。
3. The cylindrical battery according to claim 1, wherein the first tab (22) includes a plurality of tab layers in a radial direction of the cell body (21), each of the tab layers including at least one of the single-piece tabs (221);
the number of the tab layers is less than or equal to 100.
4. The cylindrical battery according to claim 1, wherein a plurality of the single tab (221) are arranged at intervals along the winding direction of the electric core (20).
5. The cylindrical battery according to claim 1, wherein the cell (20) further comprises a second tab (23), the first tab (22) and the second tab (23) being of opposite polarity, the first tab (22) and the second tab (23) extending from opposite ends of the cell body (21).
6. The cylindrical battery according to claim 5, wherein the first tab (22) is a positive tab, the cylindrical battery further comprises a battery housing (10) and a post structure (30), the post structure (30) is disposed on the battery housing (10), the battery cell (20) is disposed in the battery housing (10), and the first tab (22) is connected to the post structure (30);
wherein the second tab (23) is electrically connected to the battery case (10).
7. The cylindrical battery according to any one of claims 1 to 6, wherein lengths of the plurality of single-piece tabs (221) in the lead-out direction thereof are uniform.
8. The cylindrical battery according to any one of claims 1 to 6, wherein the first tab (22) includes a tab region including therein a plurality of single-piece tabs (221) having unequal lengths in the direction in which the single-piece tabs (221) are led out;
wherein the lengths of the plurality of single-chip tabs (221) in the tab region gradually increase along the radial direction of the battery cell main body (21).
9. The cylindrical battery according to any one of claims 1 to 6, characterized in that the diameter of the electrical cell (20) is 40mm-80mm.
10. The cylindrical battery according to any one of claims 1 to 6, wherein the thickness of the single tab (221) is 4.5 μm or more.
11. A battery comprising the cylindrical battery of any one of claims 1 to 10.
12. The battery pack according to claim 11, wherein the battery pack comprises a bottom plate (60), the cylindrical battery is arranged on the bottom plate (60), the first tab (22) and the second tab (23) of the battery cell (20) extend from opposite ends of the battery cell main body (21), the first tab (22) is a positive tab, the second tab (23) is a negative tab, and the negative tab is arranged toward the bottom plate (60).
CN202320502441.6U 2023-03-15 2023-03-15 Cylindrical battery and battery pack Active CN219534814U (en)

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Application Number Priority Date Filing Date Title
CN202320502441.6U CN219534814U (en) 2023-03-15 2023-03-15 Cylindrical battery and battery pack
DE202023102871.3U DE202023102871U1 (en) 2023-03-15 2023-05-24 Cylindrical battery and battery pack

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Application Number Priority Date Filing Date Title
CN202320502441.6U CN219534814U (en) 2023-03-15 2023-03-15 Cylindrical battery and battery pack

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