Naked battery cell, cylindrical battery and electric device
By removing the positive and negative tabs from the bare battery cell, the problem of the tabs blocking the central hole was solved, ensuring the normal opening of the explosion-proof valve and the normal electrolyte filling of the battery, thus improving the battery's safety and charge/discharge performance.
Patent Information
- Application Number
- CN202520003787.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-02
- Publication Date
- 2026-01-02
- Estimated Expiration
- 2035-01-02
AI Technical Summary
After the bare cell is formed by winding, the first and second tab layers can easily block the central hole, affecting the timely opening of the explosion-proof valve and the speed of battery electrolyte injection.
By cutting off a certain length from the positive winding start of the positive electrode tab and the negative winding start of the negative electrode tab, the problem of the electrode tab blocking the central hole is avoided.
This effectively prevents the tabs from blocking the center hole, ensuring the normal opening of the explosion-proof valve and the normal electrolyte filling of the battery, thus improving the battery's safety and charge/discharge performance.
Smart Images
Figure CN223757520U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model belongs to the technical field for directly changing chemical energy into electric energy device, specifically relates to only have the element of winding structure, especially relates to a kind of bare electric core, cylindrical battery and electric device. BACKGROUND
[0002] After winding to form bare electric core, the two ends of bare electric core form first tab layer, second tab layer respectively, and there is center hole at the axis center;When battery is in use, if a large amount of gas is generated inside, gas will be released from center hole, so as to be discharged from explosion-proof valve when pressure reaches threshold value.
[0003] In related technologies, as shown in Figure 1 First tab layer, second tab layer are prone to block center hole at axis center after being rubbed flat or cut and folded, thereby affecting timely opening of explosion-proof valve and affecting battery liquid injection speed.
[0004] Therefore, how to solve the technical problem that first tab layer, second tab layer are prone to block center hole after being rubbed flat or cut and folded is an urgent problem for those skilled in the art.
[0005] It should be noted that the above information disclosed in the background section of the present application is only used to understand the background technology of the present application, and therefore, the above description is not considered as information of prior art. CONTENT OF UTILITY MODEL
[0006] The present application provides at least a kind of bare electric core, cylindrical battery and electric device.
[0007] In the first aspect, the present application provides a kind of bare electric core, comprising: positive sheet, negative sheet and diaphragm, the bare electric core is formed by winding positive sheet, negative sheet and diaphragm;The positive sheet includes: positive current collector, at least one surface of the positive current collector includes: positive coating area for coating positive active material and non-positive coating area as positive ear;The negative sheet includes: negative current collector, at least one surface of the negative current collector includes: negative coating area for coating positive active material and non-negative coating area as negative ear;The positive ear forms first tab layer at top end, and the negative ear forms second tab layer at bottom end, and the ratio of the thickness h2 of the second tab layer and the thickness h1 of the first tab layer is between 15-95%;The length L1 of the positive ear of the positive sheet is cut off at its positive winding start end and is between 95-102mm;And / or the length L3 of the negative ear of the negative sheet is cut off at its negative winding start end and is between 68-72mm.
[0008] In an alternative embodiment, the length L2 of the positive electrode tab cut off at the positive electrode winding end of the positive electrode tab is between 70-75 mm; the ratio of the remaining width D1 of the positive electrode tab parallel to the length direction of the positive electrode tab after cutting to the width D2 of the positive electrode tab is between 16%-35% in the length L1 and the length L2; and / or the angle a of the bevel of the positive electrode tab to the length direction of the foil after cutting is in the range of 100-150° in the length L1 and the length L2.
[0009] In an alternative embodiment, the length L4 of the negative electrode tab cut off at the negative electrode winding end of the negative electrode tab is between 63-67 mm; the ratio of the remaining width D3 of the negative electrode tab parallel to the length direction of the negative electrode tab after cutting to the width D4 of the negative electrode tab is between 15%-38% in the length L3 and the length L4; and / or the angle β of the bevel of the negative electrode tab to the length direction of the foil after cutting is in the range of 100-150° in the length L3 and the length L4.
[0010] In an alternative embodiment, the area ratio of the positive electrode coating area to the positive electrode current collector is between 85%-98%.
[0011] In an alternative embodiment, the area ratio of the negative electrode coating area to the negative electrode current collector is between 87%-99%.
[0012] In a second aspect, the embodiments of the present disclosure further provide a cylindrical battery, comprising: a shell; and a bare cell as described above; and an electrolyte; wherein the bare cell is located in the shell.
[0013] In an alternative embodiment, the upper part of the shell is provided with a cap, and the cap is provided with an explosion-proof valve; wherein the opening pressure of the explosion-proof valve is between 1.9-2.2 Mpa.
[0014] In an alternative embodiment, the capacity of the cylindrical battery is between 1.8 Ah-35 Ah.
[0015] In an alternative embodiment, the height to diameter ratio of the cylindrical battery is between 1-4.
[0016] In an alternative embodiment, the sidewall of the shell is provided with a U-shaped groove; the depth H1 of the U-shaped groove is between 1.3-3 mm; and the width H2 of the U-shaped groove is between 0.1-0.9 mm.
[0017] In an alternative embodiment, the height H3 of the cap to the height H4 of the shell is between 1%-10%.
[0018] In a third aspect, the embodiments of the present disclosure further provide a power utilization device, comprising the cylindrical battery as described above.
[0019] The beneficial effects of the present application are that the bare battery cell, the cylindrical battery and the power utilization device cut off a certain length of the positive electrode winding start end of the positive electrode tab and the negative electrode winding start end of the negative electrode tab, thereby avoiding the problem that the positive electrode tab and the negative electrode tab will block the center hole when winding to form the first tab layer and the second tab layer.
[0020] Other features and advantages of the present application will be set forth in the following description of the embodiments, and in part will become apparent to those skilled in the art upon examination of the following or can be learned from practice of the present application. The objects and other advantages of the present application can be realized and attained by the structure particularly pointed out in the description, claims and drawings.
[0021] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the preferred embodiments are described in detail below, and the accompanying drawings are described as follows. BRIEF DESCRIPTION OF DRAWINGS
[0022] In order to more clearly illustrate the specific embodiments of the present application or the technical solutions in the prior art, the following will briefly introduce the drawings needed to be used in the description of the specific embodiments or the prior art. Obviously, the drawings described below are some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative labor on the basis of these drawings.
[0023] Figure 1 A structure schematic diagram of an existing bare battery cell provided by the embodiments of the present disclosure;
[0024] Figure 2 A structure schematic diagram of a bare battery cell after unfolding provided by the embodiments of the present disclosure;
[0025] Figure 3 A structure schematic diagram of a positive electrode tab and a negative electrode tab provided by the embodiments of the present disclosure;
[0026] Figure 4 A structure schematic diagram of a bare battery cell provided by the embodiments of the present disclosure;
[0027] Figure 5 A structure schematic diagram of a positive electrode current collector provided by the embodiments of the present disclosure;
[0028] Figure 6 A structure schematic diagram of a negative electrode current collector provided by the embodiments of the present disclosure;
[0029] Figure 7 A structure schematic diagram of a cylindrical battery provided by the embodiments of the present disclosure;
[0030] Figure 8 A structure schematic diagram of a U-shaped groove provided by an embodiment of the present disclosure.
[0031] In the drawings:
[0032] The shell 1, the cap 11, the explosion-proof valve 12, the U-shaped groove 13;
[0033] The bare cell 2, the positive plate 21, the positive tab 210, the positive winding start end 211, the positive winding end 212, the positive current collector 213, the positive coating area 213a, the non-positive coating area 213b, the positive tab bevel 214, the negative plate 22, the negative tab 220, the negative winding start end 221, the negative winding end 222, the negative current collector 223, the negative tab bevel 224, the negative coating area 223a, the non-negative coating area 223b, the diaphragm 23, the first tab layer 24, the second tab layer 25, the center hole 26;
[0034] The thickness h1 of the first tab layer, the thickness h2 of the second tab layer, the depth H1 of the U-shaped groove, the width H2 of the U-shaped groove. DETAILED DESCRIPTION
[0035] To make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme of the present application will be described clearly and completely below in conjunction with the drawings. Obviously, the described embodiments are some embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.
[0036] It should be noted that: similar reference numbers and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings. In addition, in the drawings, in order to effectively describe the technical content, the thickness of the components can be exaggerated or reduced.
[0037] Some embodiments of the present application will be described in detail below in conjunction with the drawings. In the case of no conflict, the following embodiments and the features in the embodiments can be combined with each other.
[0038] As shown in Figure 2 , Figure 3 At least one embodiment provides a bare cell, which includes: a positive plate 21, a negative plate 22 and a diaphragm 23, the bare cell 2 is formed by winding the positive plate 21, the negative plate 22 and the diaphragm 23, not only forming a center hole 26 at the shaft center, but also forming a first tab layer 24 at the top end and a second tab layer 25 at the bottom end.
[0039] The inventor found that: as shown in Figure 1As shown, after the first tab layer 24 and the second tab layer 25 are flattened or cut and stacked, the first tab layer 24 and the second tab layer 25 are prone to blocking the central hole 26.
[0040] Therefore, in order to solve the technical problems discovered by the inventors, this embodiment provides a solution. Specifically, the positive electrode tab 210 of the positive electrode 21 has a cut length L1 between 95-102 mm at its positive electrode winding start 211, and the negative electrode tab 220 of the negative electrode 22 has a cut length L3 between 68-72 mm at its negative electrode winding start 221, thereby avoiding the problem of blocking the central hole 26. Optionally, the cut length L1 is 97 mm; optionally, the cut length L1 is 99 mm; optionally, the cut length L3 is 69 mm; optionally, the cut length L3 is 70 mm; optionally, the cut length L3 is 71 mm.
[0041] In this embodiment, if too little of the positive electrode winding start 211 is cut off, there is still a risk of clogging the hole, causing the positive electrode tab 210 to fall into the center hole 26 and short-circuit with the negative electrode. If too much of the positive electrode winding start 211 is cut off, it will affect the high-rate charge and discharge performance of the battery. The negative electrode tab 220 is cut off shorter than the positive electrode tab 210 because the negative electrode sheet 22 is relatively softer than the positive electrode sheet 21 and is easier to flatten.
[0042] like Figure 2 As shown, in some embodiments, the positive tab 210 of the positive electrode sheet 21 has a cut length L2 of 70-75mm at its positive electrode winding end 212 to prevent the tab from folding, deforming, or leaking out. If the cut is too short, the folding problem cannot be improved, and the positive tab 210 may touch the steel shell, causing a short circuit between the positive and negative electrodes. Optionally, the cut length L2 is 72mm; optionally, the cut length L2 is 73mm; optionally, the cut length L2 is 74mm.
[0043] like Figure 3 As shown, in some embodiments, the ratio of the remaining width D1 of the positive electrode tab 210 after removal (parallel to the length direction of the electrode sheet) to the width D2 of the positive electrode tab 210 is between 16% and 35%; optionally, the ratio is 20%; optionally, the ratio is 25%; optionally, the ratio is 30%.
[0044] like Figure 3 As shown, in some embodiments, the angle α between the cut-off oblique side 214 of the positive electrode tab 210 and the length direction of the foil is in the range of 100-150° in lengths L1 and L2; optionally, the angle α is 110°; optionally, the angle α is 120°; optionally, the angle α is 130°; optionally, the angle α is 140°.
[0045] like Figure 2As shown in the drawings, in some embodiments, the length L4 of the negative tab 220 cut off at the negative winding end 222 of the negative electrode sheet 22 is between 63-67 mm, preventing the tab from folding, deforming, and leaking, etc. The negative winding end 222 is cut off to prevent the bare cell 2 from scratching the shell 1 when it enters the shell 1, causing metal debris to be distributed in the battery and causing a short circuit risk. Optionally, the cut-off length L4 is 64 mm. Optionally, the cut-off length L4 is 65 mm. Optionally, the cut-off length L4 is 66 mm.
[0046] As shown in the drawings, Figure 3 In some embodiments, the ratio of the remaining width D3 of the tab parallel to the length of the electrode sheet after cutting to the width D4 of the negative tab 220 is between 15% and 38% in the length L3 and the length L4 of the negative tab 220. Optionally, the ratio is 20%. Optionally, the ratio is 25%. Optionally, the ratio is 30%. Optionally, the ratio is 35%.
[0047] As shown in the drawings, Figure 3 In some embodiments, the angle β between the bevel 224 of the negative tab 220 after cutting and the length direction of the foil is in the range of 100-150° in the length L3 and the length L4 of the negative tab 220. Optionally, the angle β is 110°. Optionally, the angle β is 120°. Optionally, the angle β is 130°. Optionally, the angle β is 140°.
[0048] As shown in the drawings, Figure 4 In some embodiments, the positive electrode sheet 21, the negative electrode sheet 22, and the separator 23 are stacked and wound, and a central hole 26 for gas release is formed at the center of the stack. Then, the first tab layer 24 and the second tab layer 25 are flattened or cut and stacked to form the bare cell 2.
[0049] In the present embodiment, the ratio of the thickness h2 of the second tab layer 25 to the thickness h1 of the first tab layer 24 is between 15-95%. The test method for the thickness h1 and the thickness h2 includes performing a metallographic experiment on a cylindrical battery or taking a CT picture and measuring three times to obtain an average value. The flattening thickness affects the overall filling density inside the shell 1.
[0050] As shown in the drawings, Figure 5 In some embodiments, the base of the positive electrode sheet 21 is a positive current collector 213, and the positive current collector 213 is coated with a positive active material on one surface or both surfaces.
[0051] In this embodiment, taking the coating of positive electrode active material on one surface of positive electrode current collector 213 as an example, the area coated with positive electrode active material is positive electrode coating area 213a, and the area not coated with positive electrode active material is non-positive electrode coating area 213b. Non-positive electrode coating area 213b is positive electrode tab 210. After the positive electrode current collector 213 is wound around, the positive electrode tab 210 forms a first tab layer 24. The area ratio of positive electrode coating area 213a to positive electrode current collector 213 is between 85% and 98%.
[0052] like Figure 6 As shown, in some embodiments, the substrate of the negative electrode 22 is a negative electrode current collector 223, and the negative electrode current collector 223 is coated with a positive electrode active material on one or both surfaces.
[0053] In this embodiment, taking the negative electrode current collector 223 coated with a negative electrode active material on one surface as an example, the area coated with the negative electrode active material is the negative electrode coating area 223a, and the area not coated with the negative electrode active material is the non-negative electrode coating area 223b. The non-negative electrode coating area 223b is the negative electrode tab 220. The negative electrode tab 220 forms a second tab layer 25 after being wound around the negative electrode current collector 223. The area ratio of the negative electrode coating area 223a to the negative electrode current collector 223 is between 87% and 99%.
[0054] like Figure 7 As shown, at least one embodiment also provides a cylindrical battery comprising: a housing 1; and a bare cell 2 as described above; and an electrolyte; wherein the bare cell 2 is located within the housing 1.
[0055] For the specific structure and implementation process of bare cell 2, please refer to the relevant discussion in the above embodiments, which will not be repeated here.
[0056] In some embodiments, a cap 11 is provided on the upper part of the housing 1, and an explosion-proof valve 12 is provided on the cap 11; wherein the opening pressure of the explosion-proof valve 12 is between 1.9-2.2 MPa.
[0057] In this embodiment, when the cylindrical battery experiences thermal runaway and gas generation, the ratio of the thickness h2 of the second tab layer 25 to the thickness h1 of the first tab layer 24 will affect the opening pressure and opening time of the explosion-proof valve 12.
[0058] Specifically, bare cell 2 was tested by placing it inside a steel casing, which used the aforementioned explosion-proof valve 12. The casing was then inflated to simulate battery thermal runaway. The experimental data are shown in the table below:
[0059]
[0060] According to the data in the above table, when the ratio of h2 / h1 is 25%, the valve opening time and the valve opening pressure are closest to the data when there is no bare cell in the shell 1, and the safety performance is best.
[0061] In some embodiments, the cylindrical battery has a capacity of 1.8 Ah-35 Ah.
[0062] In some embodiments, the cylindrical battery has a height to diameter ratio of 1-4.
[0063] As shown in Figure 8 some embodiments, the side wall of the shell 1 is provided with a U-shaped groove 13; the depth H1 of the U-shaped groove 13 is 1.3-3 mm; and the width H2 of the U-shaped groove 13 is 0.1-0.9 mm.
[0064] In the present embodiment, the U-shaped groove 13 with appropriate size can well accommodate the cap 11, prevent the cap 11 from deforming during sealing with the shell 1, and also prevent the outer insulation ring from being compressed unevenly; if the width of the U-shaped groove 13 is too small, the stress will be too large and cracking will occur, and if the width is too large, the internal space of the battery will be wasted.
[0065] As shown in Figure 7 some embodiments, the height H3 of the cap 11 to the height H4 of the shell 1 has a ratio of 1%-10%.
[0066] At least one embodiment also provides an electric device, which includes: a cylindrical battery.
[0067] For the specific structure and implementation process of the cylindrical battery, please refer to the relevant discussion in the above embodiments, which will not be repeated here.
[0068] In summary, the bare cell, the cylindrical battery and the electric device avoid the problem that the positive tab 210 and the negative tab 220 block the center hole 26 when winding the positive tab 210 and the negative tab 220 to form the first tab layer 24 and the second tab layer 25 by cutting a certain length from the positive winding start end 211 of the positive tab 210 and the negative winding start end 221 of the negative tab 220.
[0069] In this document, when it is mentioned that a first component is located on a second component, it can mean that the first component can be directly formed on the second component, or a third component can be interposed between the first component and the second component.
[0070] In this document, when an element or layer is referred to as being "on", "engaged to", "connected to", "attached to" or "coupled to" another element or layer, it can be directly on, engaged, connected, attached or coupled to the other element or layer, or intervening elements or layers can be present. In contrast, when an element is referred to as being "directly on", "directly engaged to", "directly connected to", "directly attached to" or "directly coupled to" another element or layer, there are no intervening elements or layers present. Other words used to describe the relationship between elements should be interpreted in a like fashion (e.g., "between" versus "directly between", "adjacent" versus "directly adjacent", etc.). As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items.
[0071] In this document, example embodiments of the disclosure will be described in greater detail with reference to the accompanying drawings. As used herein, expressions such as "at least one of," when preceding a list of two or more items, modify the entire list of items and do not modify the individual items of the list.
[0072] The terminology used herein is for the purpose of describing particular example configurations only and is not intended to be limiting. As used herein, the singular articles "a," "an," and "the" can be intended to include the plural forms as well, unless the context clearly indicates otherwise. The terms "comprises," "comprising," "including," and "having" are inclusive and therefore specify the presence of stated features, steps, operations, elements, and / or components, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and / or groups thereof. The method steps, processes, and operations described herein are not to be construed as necessarily requiring their performance in the particular order
[0073] As used herein, the phrases "in an embodiment," "according to an embodiment," "in some embodiments," and the like, generally mean the particular feature, structure, or characteristic following the phrase can be included in at least one embodiment of the present disclosure. Thus, appearances of such phrases in various places throughout this specification do not necessarily all refer to the same embodiment. As used herein, the term "example" or "exemplary" means "serving as an example, instance, or illustration." Any implementation, aspect or design described herein as "example" or "exemplary" is not necessarily to be construed as preferred or advantageous over other implementations, aspects or designs. Rather, the term "example" or "exemplary" is intended to present concepts in a concrete manner.
[0074] In the description of the embodiments of the utility model, unless otherwise clear and definite, the terms "mount", "connect", "connection" should be understood in broad sense, for example, it can be fixed connection, also can be detachable connection, or integrally connected, it can be mechanical connection, also can be electrical connection, it can be direct connection, also can be indirect connection through intermediate medium, it can be the communication inside two elements. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to specific circumstances.
[0075] In the description of the utility model, it needs to be explained that the orientation or position relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like is based on the orientation or position relationship shown in the drawings, and is only for the convenience of describing the utility model and simplifying the description, and therefore cannot be understood as limiting the utility model. In addition, terms such as "first", "second" and other numerical terms are used in this document, unless otherwise indicated in this document. Therefore, the above-discussed first element, component, region, layer or section can be referred to as the second element, component, region, layer or section without departing from the teachings of the example embodiments.
[0076] Spatially relative terms, such as "inner", "outer", "beneath", "below", "lower", "above", "upper" and the like, can be used herein for ease of description to describe one element or feature's relationship to another element(s) or feature(s) as illustrated in the figures. The spatially relative terms can be intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "below" or "beneath" other elements or features would then be oriented "above" the other elements or features. Thus, the example term "below" can encompass both an orientation of above and below. The device can be otherwise oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.
[0077] In the above discussion, unless otherwise stated, the terms "about", "approximately", "substantially" and the like, when used in describing numerical values, mean a + / - 10% variation of the value.
[0078] With the above ideal embodiments according to the utility model as inspiration, through the above description, relevant staff can definitely make various changes and modifications without deviating from the technical idea of the utility model. The technical scope of the utility model is not limited to the contents in the specification, and the technical scope must be determined according to the scope of claims.
Claims
1. A bare cell comprising: The positive electrode sheet (21), the negative electrode sheet (22) and the separator (23) are wound to form the bare battery core (2); the positive electrode sheet (21) comprises: a positive electrode current collector (213), at least one surface of the positive electrode current collector (213) comprises: a positive electrode coating area (213a) for coating a positive electrode active material and a non-positive electrode coating area (213b) as a positive electrode tab (210); the negative electrode sheet (22) comprises: a negative electrode current collector (223), at least one surface of the negative electrode current collector (223) comprises: a negative electrode coating area (223a) for coating a negative electrode active material and a non-negative electrode coating area (223b) as a negative electrode tab (220); the positive electrode tab (210) forms a first tab layer (24) at the top end, and the negative electrode tab (220) forms a second tab layer (25) at the bottom end, characterized in that, The ratio of the thickness h2 of the second tab layer (25) to the thickness h1 of the first tab layer (24) is between 15-95%; The positive electrode tab (210) of the positive electrode sheet (21) is cut off at the positive electrode winding start end (211) with a length L1 between 95-102mm; and / or The negative electrode tab (220) of the negative electrode sheet (22) is cut off at the negative electrode winding start end (221) with a length L3 between 68-72mm.
2. The bare battery core of claim 1, wherein, The positive electrode tab (210) of the positive electrode sheet (21) is cut off at the positive electrode winding end (212) with a length L2 between 70-75mm; The ratio of the remaining width D1 of the tab parallel to the length direction of the tab after cutting to the width D2 of the positive electrode tab (210) in the length L1 and the length L2 is between 16%~35%; and / or The angle α of the positive electrode tab bevel (214) to the length direction of the foil after cutting is in the range of 100-150°.
3. The bare battery core of claim 1, wherein, The negative electrode tab (220) of the negative electrode sheet (22) is cut off at the negative electrode winding end (222) with a length L4 between 63-67mm; The ratio of the remaining width D3 of the tab parallel to the length direction of the tab after cutting to the width D4 of the negative electrode tab (220) in the length L3 and the length L4 is between 15%~38%; and / or The angle β of the negative electrode tab bevel (224) to the length direction of the foil after cutting is in the range of 100~150°.
4. The bare battery core of claim 1, wherein, The area ratio of the positive electrode coating area (213a) to the positive electrode current collector (213) is between 85%-98%.
5. The bare battery core of claim 1, wherein, The area ratio of the negative electrode coating area (223a) to the negative electrode current collector (223) is between 87%-99%.
6. A cylindrical battery, characterized by Comprising: a shell (1); and The bare cell (2) according to claim 1; and Electrolyte solution; Wherein The bare cell (2) is located in the shell (1).
7. The cylindrical battery according to claim 6, wherein The upper part of the shell (1) is provided with a cap (11), and the cap (11) is provided with a pressure relief valve (12); wherein The opening pressure of the pressure relief valve (12) is between 1.9-2.2 MPa.
8. The cylindrical battery according to claim 6, wherein The capacity of the cylindrical battery is between 1.8 Ah-35 Ah.
9. The cylindrical battery according to claim 6, wherein The height to diameter ratio of the cylindrical battery is between 1-4.
10. The cylindrical battery according to claim 6, wherein The sidewall of the shell (1) is provided with a U-shaped groove (13); The depth H1 of the U-shaped groove (13) is between 1.3-3 mm; The width H2 of the U-shaped groove (13) is between 0.1-0.9 mm.
11. The cylindrical battery according to claim 7, wherein The height H3 of the cap (11) to the height H4 of the shell (1) is between 1%-10%.
12. An electrical device, comprising: Comprise: The cylindrical battery according to any one of claims 6-11.