Cylindrical battery, battery pack and power utilization device

Abstract

The embodiment of the invention provides a cylindrical battery, a battery pack and a power utilization device, the cylindrical battery comprises an anti-explosion sheet and a pore plate, the pore plate comprises a main body area and a thinning area, the thinning area is connected with the anti-explosion sheet, the thickness of the main body area is L1, the thickness of the thinning area is L2, 0.2 < = L2 / L1 < = 0.4, the anti-explosion sheet is configured in a manner that the air pressure in the cylindrical battery reaches a first threshold value, the anti-explosion sheet turns over, and the air pressure in the cylindrical battery reaches a second threshold value. And the electric connection with the pore plate is disconnected. Notching grooves do not need to be formed in the thinning area of the pore plate, power-off pressure deviation can be reduced, and power-off pressure stability is improved.

Description

Technical Field

[0001] The present application relates to the field of energy storage technology, and in particular to a cylindrical battery, a battery pack and an electrical device. Background Art

[0002] A CID (current interrupt device, abbreviated as CID, current cut-off device) is usually installed inside a cylindrical battery. The CID has an electrically connected explosion-proof disk and a perforated plate. When an abnormality occurs in the cylindrical battery and the internal pressure reaches a threshold, the explosion-proof disk and the perforated plate of the CID are disconnected to cut off the internal current of the cylindrical battery, which is beneficial to improve the safety of the cylindrical battery.

[0003] In the conventional connection structure between the explosion-proof disc and the orifice plate, an annular groove is provided on the orifice plate. When the internal pressure of the cylindrical battery reaches a threshold, the groove is thin and the groove of the orifice plate breaks, separating the orifice plate from the explosion-proof disc. However, the above-mentioned groove is difficult to break at a relatively precise threshold, thus affecting the safety of the cylindrical battery. Summary of the invention

[0004] The purpose of the embodiments of the present application is to provide a cylindrical battery, a battery pack and an electrical device, which are conducive to reducing the deviation of the off-power pressure and improving the safety of the cylindrical battery.

[0005] The first aspect of the present application provides a cylindrical battery, comprising: an explosion-proof plate; an orifice plate, the orifice plate comprising a main body area and a thinning area, the thinning area and the explosion-proof plate are connected, wherein; the thickness of the main body area is L1, the thickness of the thinning area is L2, 0.2≦L2 / L1≦0.4. The thinning area of ​​the orifice plate does not need to be grooved to achieve stable cutting of the internal current of the cylindrical battery. This is conducive to reducing the deviation of the cut-off pressure, improving the stability of the cut-off pressure, and improving the safety of the cylindrical battery.

[0006] In one or more embodiments, the gas pressure in the cylindrical battery reaches a first threshold, and the portion of the bursting disk carrying the thinned region is separated from the main region, so that the bursting disk is flipped over and electrically disconnected from the orifice plate.

[0007] In one or more embodiments, 0.4 mm≦L1≦0.6 mm. The thickness of the main body region is within the range of L1. Under the condition of satisfying strength, the thickness is relatively thin, which is easy to reduce the production cost of the cylindrical battery.

[0008] In one or more embodiments, the thinning area and the explosion-proof plate are welded, and the welded area is S1; the area of ​​the thinning area is S2; 0.14≦S1 / S2≦0.31. Under the ratio range of S1 / S2, the flow area of ​​the cylindrical battery is sufficient, the internal resistance is small, and when the air pressure in the cylindrical battery reaches the first threshold, the explosion-proof plate is easy to flip over, and the part carrying the thinning area is separated from the main area, which is conducive to the rapid power off between the explosion-proof plate and the orifice plate, and improves the safety of the cylindrical battery.

[0009] In one or more embodiments, 0.79 mm 2 ≦S1≦1.77mm 2 Within the range of S1, the flow area of ​​the cylindrical battery is sufficient and the internal resistance is small. At the same time, when the air pressure in the cylindrical battery reaches the first threshold, the explosion-proof plate is easy to flip over and the part carrying the thinned area is separated from the main area, which is conducive to the rapid power failure between the explosion-proof plate and the orifice plate, thereby improving the safety of the cylindrical battery.

[0010] In one or more embodiments, the thinning area and the explosion-proof plate are connected by welding to form a welding line, the welding line is annular, and the width of the welding line is d, 0.1mm≦d≦0.4mm. Within the width range of the welding line d, the flow area of ​​the cylindrical battery is sufficient, the internal resistance is small, and when the air pressure in the cylindrical battery reaches the first threshold, the explosion-proof plate is easy to flip, and the part carrying the thinning area is separated from the main area, which is conducive to the rapid power off between the explosion-proof plate and the orifice plate, and improves the safety of the cylindrical battery.

[0011] In one or more embodiments, the welding line extends from the thinning area to the explosion-proof plate, and the welding line depth of the explosion-proof plate is H, 0.1mm≦H≦0.2mm. The explosion-proof plate is conducive to improving the connection strength between the explosion-proof plate and the orifice plate within the depth range of H, and is not prone to unexpected fracture under harsh working conditions. At the same time, when the air pressure in the cylindrical battery reaches the first threshold, the explosion-proof plate is easy to flip over, and the part carrying the thinning area is separated from the main area, which is conducive to rapid power failure between the explosion-proof plate and the orifice plate, thereby improving the safety of the cylindrical battery.

[0012] In one or more embodiments, the diameter of the cylindrical battery is D, 17 mm≦D≦65 mm; and / or the length of the cylindrical battery is L, 40 mm≦L≦250 mm. This is beneficial to improving the capacity of the cylindrical battery.

[0013] In one or more embodiments, the first threshold is P1, 1MPa≦P1≦1.4MPa. The cut-off voltage threshold of the explosion-proof disc and the orifice plate is designed within a suitable range, so that it is not easy to cause unexpected breakage under harsh working conditions. At the same time, when the air pressure in the cylindrical battery reaches the P1 range, the explosion-proof disc is easy to flip over, and the part carrying the thinned area is separated from the main area, which is conducive to rapid power off between the explosion-proof disc and the orifice plate, thereby improving the safety of the cylindrical battery.

[0014] In one or more embodiments, the material of the orifice plate includes aluminum or aluminum alloy, and / or the material of the explosion-proof disk includes aluminum or aluminum alloy. On the one hand, the cost of aluminum or aluminum alloy is relatively low, and the material of the orifice plate and the explosion-proof disk includes aluminum, which is easy to reduce the production cost of cylindrical batteries. On the other hand, aluminum or aluminum alloy is not easy to react with lithium ions, so that the orifice plate and the explosion-proof disk are easily applicable to lithium ion cylindrical batteries.

[0015] In one or more embodiments, the thickness of different positions of the thinned area is equal, so that it is easy to process and produce, and the error of the cut-off pressure is reduced, which is beneficial to improving the safety of the cylindrical battery.

[0016] A second aspect of the present application provides a battery pack comprising a cylindrical battery in any of the above embodiments.

[0017] A third aspect of the present application provides an electrical device comprising a cylindrical battery or a battery pack according to any of the above embodiments.

[0018] Beneficial effects of the embodiments of the present application:

[0019] The cylindrical battery, battery pack and electrical device provided in the embodiment of the present application, the cylindrical battery includes an explosion-proof plate and an orifice plate, the orifice plate includes a main area and a thinning area, the thinning area and the explosion-proof plate are connected, the thickness of the main area is L1, the thickness of the thinning area is L2, 0.2≦L2 / L1≦0.4, the explosion-proof plate is configured so that the air pressure in the cylindrical battery reaches the first threshold, the explosion-proof plate flips over, and the electrical connection with the orifice plate is disconnected. The ratio of the thickness L2 of the thinning area to the thickness L1 of the main area is within a certain range. When the air pressure in the cylindrical battery reaches the first threshold, the explosion-proof plate is disconnected from the orifice plate, cutting off the internal current path of the cylindrical battery. The thinning area of ​​the orifice plate does not need to be grooved to achieve stable cutting of the internal current of the cylindrical battery. It is beneficial to reduce the deviation of the cut-off pressure and improve the stability of the cut-off pressure. Under the same manufacturing cost conditions, the thinning area is easier to prepare, easy to disconnect from the explosion-proof plate at the first threshold, reducing the error of the cut-off pressure, and helping to improve the safety of the cylindrical battery.

[0020] Of course, any product implementing the present application does not necessarily need to achieve all of the advantages described above at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application, and a person skilled in the art can also obtain other drawings based on these drawings.

[0022] Figure 1 A schematic diagram of the structure of a cylindrical battery according to an embodiment of the present application;

[0023] Figure 2 for Figure 1 A schematic diagram of a partial cross-sectional structure of a cylindrical battery shown;

[0024] Figure 3 for Figure 1 A schematic cross-sectional view of a partial structure explosion of a cylindrical battery shown;

[0025] Figure 4 for Figure 1 A schematic cross-sectional structure diagram of a cylindrical battery hole plate shown;

[0026] Figure 5 for Figure 4 The structural schematic diagram of the orifice plate shown;

[0027] Figure 6 for Figure 2 The enlarged structure of A in the middle is shown;

[0028] Figure 7 A schematic diagram of the structure of a battery pack provided in an embodiment of the present application;

[0029] Figure 8 A schematic diagram of the structure of a first electrical device provided in an embodiment of the present application;

[0030] Fig. 9 A schematic diagram of the structure of a second electrical device provided in an embodiment of the present application.

[0031] The reference numerals are as follows:

[0032] Explosion-proof disk 10, orifice plate 20, main body area 21, thinning area 22, welding wire 23, shell 30, electrode assembly 40, end cover 50;

[0033] Cylindrical battery 100, battery pack 200, power-consuming device 300;

[0034] Radial direction X, axial direction Y, axis line L0. DETAILED DESCRIPTION

[0035] The technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments.

[0036] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be internal communication between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to the specific circumstances. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0037] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "multiple" is more than two, unless otherwise clearly and specifically defined.

[0038] Reference to "embodiment" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiment may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. The various embodiments in the present application may be combined with each other in the absence of conflict.

[0039] In the related art, an annular groove is provided on the orifice plate in the CID, and the center of the annular groove is connected to the explosion-proof plate. Since the bottom thickness of the annular groove is relatively thin, when the internal pressure of the cylindrical battery reaches a threshold, the explosion-proof plate flips over, causing the annular groove to break, thereby disconnecting the electrical connection between the orifice plate and the explosion-proof plate, thereby cutting off the current path of the cylindrical battery.

[0040] However, in actual production, due to the limitations of the groove processing technology and processing costs, the groove processing accuracy is limited, making it difficult to ensure that the CID will cut off the current within a smaller error pressure range (resulting in a larger error in the pressure threshold for cutting off the internal current of the cylindrical battery), thus affecting the safety of the cylindrical battery.

[0041] The present application provides a cylindrical battery, a battery pack and an electrical device, the main purpose of which is to improve the safety of the cylindrical battery.

[0042] Figure 1 A schematic diagram of the structure of a cylindrical battery according to an embodiment of the present application is shown in FIG. Figure 1As shown, in the first aspect, the embodiment of the present application provides a cylindrical battery 100, which can be a nickel-hydrogen battery, a nickel-cadmium battery, a lead-acid (or lead storage) battery, a lithium-ion battery, a polymer lithium-ion battery, a sodium-ion battery, a magnesium-ion battery, etc. The axis of the cylindrical battery 100 is L0. The radial direction of the cylindrical battery 100 is X, and X is in a plane perpendicular to the axis L0, which is the direction from the axis L0 to the outside of the cylindrical battery 100. The axial direction of the cylindrical battery 100 is Y, and Y is parallel to the axis L0 of the cylindrical battery 100.

[0043] The diameter of the cylindrical battery is D. In one or more embodiments, 17 mm≦D≦65 mm. However, it is not limited thereto. For example, D may be: 17 mm, 20 mm, 25 mm, 30 mm, 35 mm, 40 mm, 45 mm, 50 mm, 55 mm, 60 mm, 65 mm, or a value between any two values.

[0044] Along the axial direction Y of the cylindrical battery 100, the length of the cylindrical battery is L. In one or more embodiments, 40 mm≦L≦250 mm. But not limited thereto. For example, L can be: 40 mm, 50 mm, 60 mm, 70 mm, 80 mm, 90 mm, 100 mm, 110 mm, 120 mm, 130 mm, 140 mm, 150 mm, 160 mm, 170 mm, 180 mm, 190 mm, 200 mm, 210 mm, 220 mm, 230 mm, 240 mm, 250 mm, or a value between any two values.

[0045] Figure 2 for Figure 1 The schematic diagram of the partial cross-sectional structure of the cylindrical battery shown in FIG. Figure 3 for Figure 1 The schematic diagram of the cross-sectional structure of the partial structure explosion of the cylindrical battery shown in the figure, Figure 4 for Figure 1 The cross-sectional structure diagram of the orifice plate of the cylindrical battery shown in FIG. Figure 2 , Figure 3 and Figure 4As shown, the first aspect of the present application provides a cylindrical battery 100, the cylindrical battery 100 has a CID, the CID includes an explosion-proof disc 10 and an orifice plate 20, the orifice plate 20 includes a main area 21 and a thinning area 22, the thinning area 22 and the explosion-proof disc 10 are connected, wherein the thickness of the main area 21 is L1, the thickness of the thinning area 22 is L2, 0.2≦L2 / L1≦0.4; but not limited thereto. For example, L2 / L1 can be: 0.2, 0.21, 0.22, 0.23, 0.24, 0.25, 0.26, 0.27, 0.28, 0.29, 0.3, 0.31, 0.32, 0.33, 0.34, 0.35, 0.36, 0.37, 0.38, 0.39, 0.4, or a value between any two values.

[0046] The explosion-proof disk 10 is configured such that when the gas pressure in the cylindrical battery 100 reaches a first threshold, the explosion-proof disk 10 flips over and disconnects the electrical connection with the orifice plate 20 .

[0047] In one or more embodiments, the explosion-proof disc 10 is turned over, the connection between the explosion-proof disc 10 and the orifice plate 20 is torn, the explosion-proof disc 10 and the orifice plate 20 are electrically disconnected, and the internal current path of the cylindrical battery 100 is cut off.

[0048] In one or more embodiments, 0.2≦L2 / L1≦0.4, the explosion-proof plate 10 is configured such that when the air pressure in the cylindrical battery 100 reaches the first threshold, the explosion-proof plate 10 flips over, and the portion carrying the thinned area 22 is separated from the main area 21. The ratio range of the thickness L1 of the main area 21 and the thickness L2 of the thinned area 22, when the air pressure in the cylindrical battery 100 reaches the first threshold, the thinned area 22 breaks, and the internal current path of the cylindrical battery 100 is cut off. There is no need to provide a groove in the thinned area of ​​the orifice plate 20, which is conducive to reducing the deviation of the off-state pressure and improving the stability of the off-state pressure.

[0049] In one or more embodiments, 0.4mm≦L1≦0.6mm, but not limited thereto. For example, L1 may be: 0.40mm, 0.41mm, 0.42mm, 0.43mm, 0.44mm, 0.45mm, 0.46mm, 0.47mm, 0.48mm, 0.49mm, 0.50mm, 0.51mm, 0.52mm, 0.53mm, 0.54mm, 0.55mm, 0.56mm, 0.57mm, 0.58mm, 0.59mm, 0.60mm, or a value between any two values. The thickness of the main region 21 is within the L1 range. Under the condition of meeting the strength requirement, the thickness is relatively thin, and it is easy to reduce the production cost of the cylindrical battery 100.

[0050] In one or more embodiments, 0.08mm≦L2≦0.24mm. But not limited thereto. For example, L2 may be: 0.08mm, 0.09mm, 0.10mm, 0.11mm, 0.12mm, 0.13mm, 0.14mm, 0.15mm, 0.16mm, 0.17mm, 0.18mm, 0.19mm, 0.20mm, 0.21mm, 0.22mm, 0.23mm, 0.24mm, or a value between any two values. The thickness of the thinned area 22 is within the L2 range. Under the condition of meeting the strength requirement, the thickness is relatively thin, and it is easy to reduce the production cost of the cylindrical battery 100.

[0051] In one or more embodiments, the thickness of different positions of the thinning area 22 is equal. It is understandable that the thickness of different positions should be considered equal within the tolerance range. On the one hand, no groove is set in the thinning area 22. On the other hand, the uniform thickness structure of the thinning area 22 further makes it easy to control the processing accuracy of the thinning area 22, and the CID of the cylindrical battery is easy to disconnect at a more precise first threshold pressure (the bottom thickness of the conventional groove is difficult to accurately control during processing, so the CID is difficult to disconnect at a more precise threshold), which is beneficial to improving the safety of the cylindrical battery 100.

[0052] In one or more embodiments, the cylindrical battery 100 further includes a housing 30, an electrode assembly 40 and an end cap 50. Along the axis L0, the end cap 50, the explosion-proof disk 10, the orifice plate 20 and the electrode assembly 40 are sequentially arranged. The electrode assembly 40 is arranged in the housing 30, the end cap 50 covers the opening at the top of the housing 30 and is insulated and connected to the housing 30, the explosion-proof disk 10 is electrically connected to the end cap 50, and the orifice plate 20 is electrically connected to the electrode assembly 40.

[0053] The cylindrical battery 100 of the present application is not limited to being a primary battery or a secondary battery. As an example, the cylindrical battery 100 is a lithium-ion secondary battery. In one or more embodiments, the electrode assembly 40 includes a first pole piece, a second pole piece, and a diaphragm. The first pole piece and the second pole piece have opposite polarities, and the diaphragm is disposed between the first pole piece and the second pole piece. During the charge and discharge process of the lithium-ion secondary battery, lithium ions are inserted and removed back and forth between the first pole piece and the second pole piece.

[0054] In one or more embodiments, the first pole piece includes a first body and a first pole ear, and the second pole piece includes a second body and a second pole ear. The first body includes a first current collector and a first active material layer coated on the surface of the first current collector, and the first pole ear is connected to the first current collector. The second body includes a second current collector and a second active material layer coated on the surface of the second current collector, and the second pole ear is connected to the second current collector. The end cap 50 is electrically connected to the first pole ear of the electrode assembly 40, and the end cap 50 forms the first electrode terminal of the cylindrical battery 100. The shell 30 is electrically connected to the second pole ear of the electrode assembly 40, and the shell 30 forms the second electrode terminal of the cylindrical battery 100. One of the first electrode terminal and the second electrode terminal is a positive electrode, and the other is a negative electrode. As a result, the shell 30 replaces a traditional electrode terminal, which is conducive to simplifying the structure of the cylindrical battery 100.

[0055] In one or more embodiments, the first threshold is P1, 1MPa≦P1≦1.4MPa. But not limited to this. For example, P1 can be: 1.00MPa, 1.05MPa, 1.10MPa, 1.15MPa, 1.20MPa, 1.25MPa, 1.30MPa, 1.35MPa, 1.40MPa, or a value between any two values. When the air pressure in the shell 30 of the cylindrical battery 100 reaches the P1 range, the explosion-proof plate 10 is turned over, and the part carrying the thinning area 22 is separated from the main area 21, which is beneficial to improve the safety of the cylindrical battery 100.

[0056] When the internal gas pressure of the cylindrical battery 100 increases to reach the second threshold value P2, the groove of the explosion-proof plate 10 is cracked, and the cylindrical battery 100 releases pressure to the outside through the cracked groove, which is beneficial to improving the safety of the cylindrical battery 100.

[0057] In one or more embodiments, 1.8 MPa ≤ P2 ≤ 2.2 MPa, but is not limited thereto. For example, P2 may be: 1.80 MPa, 1.82 MPa, 1.84 MPa, 1.86 MPa, 1.88 MPa, 1.90 MPa, 1.92 MPa, 1.94 MPa, 1.96 MPa, 1.98 MPa, 2.00 MPa, 2.02 MPa, 2.04 MPa, 2.06 MPa, 2.08 MPa, 2.10 MPa, 2.12 MPa, 2.14 MPa, 2.16 MPa, 2.18 MPa, 2.20 MPa, or a value between any two values.

[0058] The present application has no particular limitation on the material of the shell 30 . In one or more embodiments, the material of the shell 30 includes steel, which is beneficial to improving the strength of the cylindrical battery 100 .

[0059] The present application has no particular restrictions on the material of the orifice plate 20. In one or more embodiments, the material of the orifice plate 20 includes aluminum or aluminum alloy. On the one hand, the cost of aluminum or aluminum alloy is low, and the material of the orifice plate 20 includes aluminum or aluminum alloy, which is easy to reduce the production cost of the cylindrical battery 100. On the other hand, aluminum or aluminum alloy is not easy to react with lithium ions, so that the orifice plate 20 is easy to be applied to the cylindrical battery 100 of lithium ions.

[0060] The present application has no particular restrictions on the material of the explosion-proof disc 10. In one or more embodiments, the material of the explosion-proof disc 10 includes aluminum or aluminum alloy. On the one hand, the cost of aluminum or aluminum alloy is low, and the material of the explosion-proof disc 10 includes aluminum or aluminum alloy, which is easy to reduce the production cost of the cylindrical battery 100. On the other hand, aluminum or aluminum alloy is not easy to react with lithium ions, so that the explosion-proof disc 10 is easy to be applied to the cylindrical battery 100 of lithium ions.

[0061] Figure 5 for Figure 4 The structural schematic diagram of the orifice plate 20 shown in FIG. Figure 6 for Figure 2 The enlarged structure of A is shown in the figure. Figure 5 and Figure 6 As shown, in one or more embodiments, the thinning area 22 and the explosion-proof disk 10 are welded, and the welded area is S1. S1 is the sum of the area of ​​the area surrounded by the welding line and the area of ​​the welding line. The area of ​​the thinning area 22 is S2; 0.14≦S1 / S2≦0.31, but not limited to this. For example, S1 / S2 can be: 0.14, 0.15, 0.16, 0.17, 0.18, 0.19, 0.20, 0.21, 0.22, 0.23, 0.24, 0.25, 0.26, 0.27, 0.28, 0.29, 0.30, 0.31, or a value between any two values. In the ratio range of S1 / S2, the flow area of ​​the cylindrical battery is larger and the internal resistance is smaller. At the same time, the air pressure in the cylindrical battery 100 reaches the first threshold value, the explosion-proof plate 10 is easy to flip, and the part carrying the thinned area 22 is separated from the main area 21, which is beneficial to quickly cut off the power between the explosion-proof plate 10 and the orifice plate 20, thereby improving the safety of the cylindrical battery 100.

[0062] In one or more embodiments, 0.79 mm 2 ≦S1≦1.77mm 2But not limited to this. For example, S1 can be: 0.79 mm², 0.80 mm², 0.85 mm², 0.90 mm², 0.95 mm², 1.00 mm², 1.05 mm², 1.10 mm², 1.15 mm², 1.20 mm², 1.25 mm², 1.30 mm², 1.35 mm², 1.40 mm², 1.45 mm², 1.50 mm², 1.55 mm², 1.60 mm², 1.65 mm², 1.70 mm², 1.75 mm², 1.77 mm², or a value between any two values.

[0063] In one or more embodiments, 2.55 mm 2 ≦S2≦12.64 mm 2 . But not limited to this. For example, S2 can be: 2.55 mm², 3.05 mm², 3.55 mm², 4.05 mm², 4.55 mm², 5.05 mm², 5.55 mm², 6.05 mm², 6.55 mm², 7.05 mm², 7.55 mm², 8.05 mm², 8.55 mm², 9.05 mm², 9.55 mm², 10.05 mm², 10.55 mm², 11.05 mm², 11.55 mm², 12.05 mm², 12.6 mm², 12.64 mm², or a value between any two values.

[0064] In one or more embodiments, the thinned area 22 and the explosion-proof disk 10 are connected by welding to form a welding line 23, the welding line 23 is annular, and the width of the welding line 23 is d, 0.1mm≦d≦0.4mm. But not limited to this. For example, d can be: 0.10mm, 0.11mm, 0.12mm, 0.13mm, 0.14mm, 0.15mm, 0.16mm, 0.17mm, 0.18mm, 0.19mm, 0.20mm, 0.20mm, 0.22mm, 0.24mm, 0.26mm, 0.28mm, 0.30mm, 0.32mm, 0.34mm, 0.36mm, 0.38mm, 0.40mm, or a value between any two values. d is the radial width. When the welding line 23 is within the width range of d, the flow area of ​​the cylindrical battery is large and the internal resistance is small. At the same time, the air pressure in the cylindrical battery 100 reaches the first threshold value, and the explosion-proof plate 10 is easy to flip over, and the part carrying the thinned area 22 is separated from the main area 21, which is beneficial to quickly cut off the power between the explosion-proof plate 10 and the orifice plate 20, thereby improving the safety of the cylindrical battery 100.

[0065] In one or more embodiments, the welding line 23 extends from the thinning area 22 to the explosion-proof plate 10, and the depth of the welding line 23 of the explosion-proof plate 10 is H, 0.1mm≦H≦0.2mm. But not limited to this. For example, H can be: 0.10mm, 0.11mm, 0.12mm, 0.13mm, 0.14mm, 0.15mm, 0.16mm, 0.17mm, 0.18mm, 0.19mm, 0.20mm, or a value between any two values. The explosion-proof plate 10 is within the depth range of H, which is conducive to improving the connection strength between the explosion-proof plate 10 and the orifice plate 20, and is not prone to unexpected fracture under harsh working conditions. At the same time, the air pressure in the cylindrical battery 100 reaches the first threshold, and the explosion-proof plate 10 is easy to flip, and the part carrying the thinning area 22 is separated from the main area 21, which is conducive to rapid power failure between the explosion-proof plate 10 and the orifice plate 20, and improves the safety of the cylindrical battery 100.

[0066] In a second aspect, the present application provides a battery pack 200, Figure 7 A schematic diagram of the structure of the battery pack provided in the embodiment of the present application, such as Figure 7 As shown, the battery pack 200 includes the cylindrical battery 100 of any of the above embodiments. There is at least one cylindrical battery 100. In one or more embodiments, there are multiple cylindrical batteries 100, and the multiple cylindrical batteries 100 are connected in series or in parallel, or the multiple cylindrical batteries 100 are combined in series and in parallel.

[0067] In a third aspect, the present application provides an electrical device 300, comprising a cylindrical battery 100 or a battery pack 200 according to any of the above embodiments.

[0068] In one or more embodiments, Figure 8 A schematic diagram of the structure of the first electrical device provided in the embodiment of the present application is shown in FIG. Figure 8 As shown, the electric device 300 includes the battery pack 200 in the above embodiment, and the battery pack 200 includes the cylindrical battery 100 in the above embodiment.

[0069] In one or more embodiments, Fig. 9 A schematic diagram of the structure of a second electrical device provided in an embodiment of the present application is shown in FIG. Fig. 9 As shown, the electric device 300 includes the cylindrical battery 100 in the above embodiment.

[0070] The present application does not specifically limit the electrical device, and the electrical device includes electrical devices known in the prior art. For example, the electrical device includes but is not limited to a backup power supply, a two-wheeled vehicle, an unmanned aerial vehicle, a power tool, or an energy storage device.

[0071] Method for measuring thickness of main area and thinning area of ​​cylindrical battery:

[0072] Use a micrometer to measure the thickness of different positions of the main body of the cylindrical battery, measure 10 times, take the average of the 10 thicknesses, and obtain the thickness L1 of the main body of the cylindrical battery;

[0073] Use a micrometer to measure the thickness of different positions of the cylindrical battery thinning area, measure 10 times, take the average of the 10 thicknesses, and obtain the thickness L2 of the cylindrical battery thinning area;

[0074] Method for measuring the thinning area of ​​cylindrical battery, the welding area of ​​thinning area and explosion-proof plate:

[0075] The welding area between the thinning area of ​​the cylindrical battery and the explosion-proof plate was measured using an image dimension measuring instrument (Keyence IM8000) for 10 times. The average of the 10 welding areas was taken to obtain the welding area S1 between the thinning area of ​​the cylindrical battery and the explosion-proof plate.

[0076] Use an image dimension measuring instrument (Keyence IM8000) to measure the area of ​​the thinned area of ​​the cylindrical battery. Measure 10 times and take the average of the 10 areas to obtain the area S2 of the thinned area of ​​the cylindrical battery.

[0077] Method for measuring the weld depth of cylindrical battery explosion-proof plates:

[0078] The welding line depth of the cylindrical battery explosion-proof piece was scanned and measured by industrial CT (Zeiss Xradia620Versa), and the maximum depth value was taken as the welding line depth H of the cylindrical battery explosion-proof piece.

[0079] Test of the cut-off pressure of explosion-proof disk and orifice plate:

[0080] Record the air pressure value Xi inside the shell when the explosion-proof plate and the orifice plate of each cylindrical battery explosion test are powered off, and calculate the variance σ of the power-off pressure value Xi of each embodiment and comparative example 2 , σ² = Σ(Xi-M)² / n.

[0081] Wherein, Xi represents the i-th recorded value in each embodiment and comparative example, M represents the overall mean in each embodiment and comparative example, and n represents the number of overall recorded values ​​in each embodiment and comparative example.

[0082] Preparation and testing of cylindrical batteries in various embodiments and comparative examples:

[0083] Preparation of cylindrical batteries: groove the empty steel shell according to the production line process to make the shell, weld an aluminum sheet to the inner wall of the steel shell, weld the other end of the aluminum sheet to the end cover, insert the end cover, use a conventional current on-off tester to test the end cover and the steel shell circuit conduction, and then seal the end cover to obtain a cylindrical battery. Use drilling equipment to drill a circular hole at the bottom of the cylindrical battery shell. The diameter of the circular hole is 4mm. The first threshold for the explosion-proof plate and the orifice plate to disconnect the power is set to 1.2MPa, and the second threshold for the explosion of the explosion-proof plate is designed to be 2MPa;

[0084] Fixture fixation: Use a fixture (self-made) to fix the cylindrical battery and compress the sealing ring that contacts the bottom of the cylindrical battery shell to seal;

[0085] Explosion test: Use a pneumatic burst tester (model SC-QYBP-10, Xiamen Sanchuang Keyi Testing Equipment Co., Ltd.), open the inflation valve, and inflate the inside of the shell through the circular hole at the bottom of the shell at a speed of 0.1MPa / s. When the current continuity tester displays a current break, record the air pressure value Xi inside the shell.

[0086] Example 1

[0087] 100 cylindrical batteries from the same batch were taken. The thinning area of ​​the orifice plate of the cylindrical batteries in this batch had no grooves. The specific preparation parameters of D, L, L1, L2, S1, S2, d, H, and P1 of the cylindrical batteries are shown in Table 1.

[0088] Example 2

[0089] 100 cylindrical batteries from the same batch are taken. Except for adjusting the relevant preparation parameters according to Table 1, the rest of the cylindrical batteries in this batch are the same as those in Example 1.

[0090] Example 3

[0091] 100 cylindrical batteries from the same batch are taken. Except for adjusting the relevant preparation parameters according to Table 1, the rest of the cylindrical batteries in this batch are the same as those in Example 1.

[0092] Comparative Example 1

[0093] 100 cylindrical batteries from the same batch were taken. The thinning area of ​​the cylindrical battery hole plate of this batch was provided with an annular groove. The residual thickness of the groove was 0.07 mm. In addition, the relevant preparation parameters were adjusted according to Table 1. The rest was the same as Example 1.

[0094] The parameters and performance of each embodiment and comparative example of the present application are described below. The parameters and performance of each embodiment and comparative example are shown in Table 1.

[0095] Table 1

[0096]

[0097] The annotations for the parameters in Table 1 are as follows:

[0098] D is the diameter of the cylindrical battery, in mm;

[0099] L is the length of the cylindrical battery, in mm;

[0100] L1 is the thickness of the main body area, in mm;

[0101] L2 is the thickness of the thinning area, in mm;

[0102] S1 is the welding area of ​​the thinning area and the explosion-proof disk, in mm 2 ;

[0103] S2 is the area of ​​the thinning zone, in mm 2 ;

[0104] d is the width of the welding line, in mm;

[0105] H is the welding line depth of the explosion-proof disk, in mm;

[0106] P1 is the design air pressure for the explosion-proof disk to flip and disconnect the power from the explosion-proof disk and the orifice plate, in MPa;

[0107] σ 2 is the variance of the cut-off voltage value of the cylindrical battery, in MPa 2 .

[0108] From the comparison between Examples 1 to 3 and Comparative Example 1, it can be seen that the thinning area of ​​the cylindrical battery orifice plate of Examples 1 to 3 has no grooves, and the variance σ of the cut-off voltage values ​​of 100 cylindrical batteries in Examples 1 to 3 is 2 Therefore, it is helpful to reduce the deviation of the cylindrical battery's off-state pressure and improve the stability of the off-state pressure.

[0109] It can be seen from Examples 1 to 3 that, in Examples 1 to 3, as the ratio of S1 / S2 of the cylindrical battery decreases and the thickness L2 of the thinned area increases, the variance σ of the cut-off voltage values ​​of 100 cylindrical batteries in Examples 1 to 3 is 2 Gradually reducing it will help reduce the deviation of the cylindrical battery's off-pressure and improve the stability of the off-pressure.

[0110] The above description is only a preferred embodiment of the present application and is not intended to limit the protection scope of the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application are included in the protection scope of the present application.

Claims

1. A cylindrical battery, characterized in that: include: Explosion-proof disk; The orifice plate comprises a main body area and a thinning area, and the thinning area is connected to the explosion-proof disk; wherein, The thickness of the main area is L1, the thickness of the thinned area is L2, and 0.2≦L2 / L1≦0.

4.

2. The cylindrical battery according to claim 1, characterized in that: When the gas pressure in the cylindrical battery reaches a first threshold, the portion of the explosion-proof disk carrying the thinned area is separated from the main area, so that the explosion-proof disk is turned over and disconnected from the orifice plate.

3. The cylindrical battery according to claim 2, characterized in that: The first threshold is P1, 1MPa≦P1≦1.4MPa.

4. The cylindrical battery according to any one of claims 1 to 3, characterized in that: 0.4mm≦L1≦0.6mm.

5. The cylindrical battery according to any one of claims 1 to 4, characterized in that: The thinned area and the explosion-proof plate are welded, and the welding area is S1; The area of ​​the thinned zone is S2; 0.14≦S1 / S2≦0.

31.

6. The cylindrical battery according to claim 5, characterized in that: <h2 style=";text-align:left;direction:ltr">0.79mm<h2 style=";text-align:left;direction:ltr"> 2 <h2 style=";text-align:left;direction:ltr"> ≦S1≦1.77mm<h2 style=";text-align:left;direction:ltr"> 2 <h2 style=";text-align:left;direction:ltr"> 。 7. The cylindrical battery according to claim 5 or 6, characterized in that: The thinned area and the explosion-proof plate are connected by welding to form a welding line, the welding line is annular, and the width of the welding line is d, 0.1mm≦d≦0.4mm.

8. The cylindrical battery according to claim 7, characterized in that: The welding line extends from the thinning area to the explosion-proof plate, and the welding line depth of the explosion-proof plate is H, 0.1mm≦H≦0.2mm.

9. The cylindrical battery according to any one of claims 1 to 8, characterized in that: The diameter of the cylindrical battery is D, 17mm≦D≦65mm; and / or, The length of the cylindrical battery is L, 40mm≦L≦250mm.

10. The cylindrical battery according to any one of claims 1 to 9, characterized in that: The material of the orifice plate includes aluminum or an aluminum alloy; and / or the material of the explosion-proof disk includes aluminum or an aluminum alloy.

11. The cylindrical battery according to any one of claims 1 to 10, characterized in that: The thickness of the thinned area is equal at different positions.

12. A battery pack, characterized in that: A cylindrical battery comprising any one of claims 1 to 11.

13. An electrical device, characterized in that: The invention comprises the cylindrical battery according to any one of claims 1 to 11 or the battery pack according to claim 12.

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