Cylindrical battery and electric equipment

Abstract

The utility model relates to the technical field of energy storage, in particular to a cylindrical battery and electric equipment. The cylindrical battery comprises a shell and an electrode assembly, the shell is provided with a containing cavity, and the shell comprises a bottom wall. The electrode assembly is arranged in the containing cavity and provided with a center hole. A first through hole is formed in the bottom wall, the projection of the first through hole is separated from the projection of the center hole in the axial direction of the cylindrical battery, a groove is further formed in the side, facing the electrode assembly, of the bottom wall, and the groove communicates with the first through hole and the center hole. The first through hole in the bottom wall and the center hole of the electrode assembly are communicated through the groove, and when liquid injection is performed on the cylindrical battery, electrolyte is conducted into the center hole through the groove, so that the liquid injection efficiency is improved.

Description

Technical Field

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

[0002] Cylindrical cells have obvious advantages in terms of safety, economy, and recycling value. In the related art, the liquid injection port of the cylindrical battery is set in the central area of ​​the bottom wall. Since the central area is often used as a welding area, the liquid injection efficiency is affected. Utility Model Content

[0003] In view of this, the present application provides a cylindrical battery and electrical equipment, which are beneficial to improving the liquid injection efficiency of the cylindrical battery.

[0004] In a first aspect, an embodiment of the present application provides a cylindrical battery, comprising a shell and an electrode assembly, wherein the shell has a receiving cavity, and the shell comprises a bottom wall. The electrode assembly is disposed in the receiving cavity, and the electrode assembly has a center hole. The bottom wall is provided with a first through hole, and along the axial direction of the cylindrical battery, the projection of the first through hole is separated from the projection of the center hole, and the bottom wall is further provided with a groove on one side facing the electrode assembly, and the groove connects the first through hole and the center hole.

[0005] In the above cylindrical battery, since the center position of the bottom wall needs to be welded, the projection of the first through hole is designed to be separated from the projection of the center hole along the axial direction of the cylindrical battery, so as to reserve a welding position at the center position of the bottom wall. A groove is provided on the side of the bottom wall of the shell facing the electrode assembly, and the first through hole of the bottom wall and the center hole of the electrode assembly are connected through the groove. When the cylindrical battery is filled with liquid, the electrolyte is conducted to the center hole through the groove, which is conducive to improving the filling efficiency.

[0006] In one or more of the above embodiments, the cylindrical battery further includes a current collecting plate, which is disposed in the accommodating cavity, and the current collecting plate is disposed between the electrode assembly and the bottom wall, and connects the electrode assembly and the bottom wall; the current collecting plate is provided with a second through hole, and the second through hole connects the groove and the center hole.

[0007] In the above cylindrical battery, the current collecting plate is electrically connected to the electrode assembly and the bottom wall, which is conducive to improving the electrical connection stability between the electrode assembly and the shell. The second through hole on the current collecting plate is connected to the groove and the center hole of the electrode assembly, so that when the cylindrical battery is injected, the electrolyte flows through the second through hole of the current collecting plate to the center hole of the electrode assembly, thereby achieving smooth injection.

[0008] In one or more of the above embodiments, the bottom wall includes a central area, the central area is connected to the collecting plate, and along the axial direction of the cylindrical battery, the projection of the central area overlaps with the projection of the center hole; the groove includes a first section and a second section, the first section surrounds at least a portion of the central area and is connected to the second through hole, and the second section is connected to the first section and the first through hole.

[0009] In the above cylindrical battery, the first section of the groove surrounds at least part of the central area and is connected to the second through hole, the second section is connected to the first section and the first through hole, and along the axial direction of the cylindrical battery, the projection of the central area overlaps with the projection of the central hole, so that in the process of injecting liquid into the cylindrical battery, the first through hole, the second section, the first section, the second through hole and the central hole form an injection channel, and the electrolyte can enter the cylindrical battery along the injection channel to complete the injection. The central area can be welded to the collector plate, thereby improving the stability of the electrical connection.

[0010] In one or more of the above embodiments, the groove further includes a third section and a fourth section, the third section is arranged around the first section and connected to the first through hole, there are multiple fourth sections, and each of the fourth sections is connected to the first section and the third section.

[0011] In the above-mentioned cylindrical battery, the third section is arranged around the first section and connected to the first through hole, and each fourth section is connected to the first section and the third section, so that the electrolyte injected into the first through hole can be diverted through the third section, thereby reducing the injection flow pressure of the second section, and injecting the electrolyte from the first section and multiple fourth sections into the central hole respectively, thereby improving the injection efficiency.

[0012] In one or more of the above embodiments, the third section is arranged around the central area.

[0013] In the above cylindrical battery, the third section is arranged around the central area so that the paths from the first through hole to the central area are arranged in parallel, reducing the effect of blockage of one or more channels in the second section or the plurality of fourth sections on liquid injection. The electrolyte can pass through the third section, flow into the unblocked channels in the second section or the plurality of fourth sections, and flow into the central hole, which is conducive to improving the stability of liquid injection.

[0014] In one or more of the above embodiments, the second segment and the fourth segment are symmetrically distributed around the center of the central area.

[0015] In the above cylindrical battery, the second section and all the fourth sections are symmetrically distributed around the center of the central area, so that the intervals between the second section and all the fourth sections are uniform, which is beneficial to improving the structural strength of the bottom wall.

[0016] In one or more of the above embodiments, there are a plurality of the second through holes, and along the axial direction of the cylindrical battery, the projection of each of the second through holes overlaps with the projection of the first segment.

[0017] In the above cylindrical battery, there are multiple second through holes on the current collecting disk. Along the axial direction of the cylindrical battery, the projection of each second through hole overlaps with the projection of the first section, which is beneficial to improve the efficiency of the electrolyte passing through the second through holes of the current collecting disk from the first section into the center hole.

[0018] In one or more of the above embodiments, the depth of the groove is h mm, the thickness of the bottom wall is H mm, and 1 / 6≤h / H≤2 / 5, 0.6≤H≤1.5 is satisfied.

[0019] In the above cylindrical battery, the thickness of the bottom wall is set between 0.6 mm and 1.5 mm. By controlling the ratio of the depth of the groove to the thickness of the bottom wall between 1 / 6 and 2 / 5, it is beneficial to improve the liquid injection efficiency of the groove while taking into account the structural strength of the bottom wall.

[0020] In one or more of the above embodiments, the material of the bottom wall includes steel, 1 / 6≤h / H≤1 / 3; or the material of the bottom wall includes aluminum, 1 / 5≤h / H≤2 / 5.

[0021] In the above-mentioned cylindrical battery, when the material of the bottom wall is steel, the ratio of the depth of the groove to the thickness of the bottom wall is controlled between 1 / 6 and 1 / 3, and when the material of the bottom wall is aluminum, the ratio of the depth of the groove to the thickness of the bottom wall is controlled between 1 / 5 and 2 / 5, which is beneficial to improve the liquid injection efficiency of the groove while taking into account the structural strength of the bottom wall.

[0022] In one or more of the above embodiments, the width of the groove is k millimeters, satisfying 1≤k≤5; and / or the diameter of the cylindrical battery is 17-65 mm.

[0023] In the above cylindrical battery, the width of the groove is set between 1 mm and 5 mm, which is conducive to the rapid flow of electrolyte from the groove to the central hole.

[0024] In a second aspect, an embodiment of the present application provides an electrical device, comprising a cylindrical battery in one or more of the above embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the overall structure of a cylindrical battery in one embodiment of the present application.

[0026] Figure 2 yes Figure 1 Schematic diagram of the cross-sectional structure of a medium cylindrical battery along the AA position.

[0027] Figure 3 yes Figure 2 Schematic diagram of the enlarged structure of part B.

[0028] Figure 4 yes Figure 2 Schematic diagram of the enlarged structure of part C.

[0029] Figure 5 It is a top view of the first embodiment of the bottom wall in the present application.

[0030] Figure 6 It is a top view of the second embodiment of the bottom wall in the present application.

[0031] Figure 7 It is a top view of the third embodiment of the bottom wall in the present application.

[0032] Figure 8 It is a top view of the fourth embodiment of the bottom wall in the present application.

[0033] Fig. 9 It is a schematic diagram of the structure of the current collector in one embodiment of the present application.

[0034] Fig.10 It is a schematic diagram of the overall structure of the bottom of a cylindrical battery in one embodiment of the present application.

[0035] Fig.11 It is a schematic diagram of the structure of an electrical device in an embodiment of the present application.

[0036] Main component symbols

[0037] 001 Cylindrical battery

[0038] 100 Shell

[0039] 110 Accommodation chamber

[0040] 120 bottom wall

[0041] 121 First through hole

[0042] 122 groove

[0043] 1221 First paragraph

[0044] 1222 Second paragraph

[0045] 1223 The third paragraph

[0046] 1224 The fourth paragraph

[0047] 123 Central Area

[0048] 130 Sidewall

[0049] 200 Electrode Assembly

[0050] 210 Center hole

[0051] 220 First Pole

[0052] 230 Second Pole

[0053] 300 End Cap

[0054] 400 Collector Plate

[0055] 410 Second through hole

[0056] 500 Seals

[0057] 002 Electrical equipment

[0058] Z axis DETAILED DESCRIPTION

[0059] The technical solutions in the embodiments of the present application will be 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.

[0060] It should be noted that when an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be a centrally arranged element at the same time. When an element is considered to be "set on" another element, it can be directly set on the other element or there may be a centrally arranged element at the same time. 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, an electrical connection, or an insulated connection; it can be directly connected, or 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.

[0061] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used herein in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application. The terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned description of the drawings are intended to cover non-exclusive inclusions.

[0062] 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.

[0063] 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.

[0064] It should be noted that the thickness, length, width and other dimensions of various components in the embodiments of the present application shown in the drawings, as well as the overall thickness, length, width and other dimensions of the integrated device are only exemplary and should not constitute any limitation to the present application.

[0065] One or more embodiments of the present application provide a cylindrical battery.

[0066] The battery comprises a shell and an electrode assembly, wherein the shell has a receiving cavity and the shell comprises a bottom wall. The electrode assembly is arranged in the receiving cavity and has a central hole. The bottom wall is provided with a first through hole, and along the axial direction of the cylindrical battery, the projection of the first through hole is separated from the projection of the central hole. A groove is also provided on the side of the bottom wall facing the electrode assembly, and the groove connects the first through hole and the central hole.

[0067] In the above cylindrical battery, since the center position of the bottom wall needs to be welded, the projection of the first through hole is designed to be separated from the projection of the center hole along the axial direction of the cylindrical battery, so as to reserve a welding position at the center position of the bottom wall. A groove is provided on the side of the bottom wall of the shell facing the electrode assembly, and the first through hole of the bottom wall and the center hole of the electrode assembly are connected through the groove. When the cylindrical battery is filled with liquid, the electrolyte is conducted to the center hole through the groove, which is conducive to improving the filling efficiency.

[0068] Some embodiments of the present application are described in detail below in conjunction with the accompanying drawings. In the absence of conflict, the features in the following embodiments and examples can be combined with each other.

[0069] See also Figure 1 and Figure 2 An embodiment of the present application provides a cylindrical battery 001, including a shell 100 and an electrode assembly 200, the shell 100 has a receiving cavity 110, and the electrode assembly 200 is disposed in the receiving cavity 110.

[0070] One end of the housing 100 is provided with an opening (not shown), and the cylindrical battery 001 further includes an end cap 300, which is provided at the opening of the housing 100 and forms a receiving cavity 110. The electrode assembly 200 has a first pole 220 and a second pole 230, the first pole 220 of the electrode assembly 200 is electrically connected to the housing 100, the second pole 230 of the electrode assembly 200 is electrically connected to the end cap 300, and the end cap 300 is insulated from the housing 100.

[0071] The housing 100 includes a bottom wall 120 and a side wall 130 . The side wall 130 surrounds and is sealed to the bottom wall 120 . The end cover 300 is insulated and sealed to a side of the side wall 130 away from the bottom wall 120 to form a receiving cavity 110 .

[0072] In some embodiments, the bottom wall 120 and the side wall 130 are integrally formed by stamping, so that the bottom wall 120 and the side wall 130 have the same thickness.

[0073] In other embodiments, the bottom wall 120 and the side wall 130 are separately provided and welded together. The thickness of the bottom wall 120 and the side wall 130 can be the same, or the thickness of the bottom wall 120 can be greater than the thickness of the side wall 130 according to the structural design requirements of the cylindrical battery 001.

[0074] See also Figure 2 , Figure 3 and Figure 4 The electrode assembly 200 has a central hole 210, which is approximately located at the position of the winding central axis of the electrode assembly 200. The bottom wall 120 is provided with a first through hole 121. Since the center position of the bottom wall 120 needs to be welded, the projection of the first through hole 121 is designed to be separated from the projection of the central hole 210 along the axial direction Z of the cylindrical battery 001, thereby reserving a welding position at the center position of the bottom wall 120.

[0075] A groove 122 is further provided on the side of the bottom wall 120 facing the electrode assembly 200, and the groove 122 connects the first through hole 121 of the bottom wall 120 and the central hole 210 of the electrode assembly 200. When the cylindrical battery 001 is injected, the electrolyte is conducted to the central hole 210 through the groove 122 to improve the injection efficiency.

[0076] In some embodiments, the electrode assembly 200 adopts a full-tab winding structure (not shown). The full-tab winding structure includes a first pole piece, a second pole piece, and a separator.

[0077] The first pole piece, the diaphragm, and the second pole piece are stacked and wound in sequence. The first pole piece includes a first current collector and a first active coating, the first current collector includes a first coating area and a first empty foil area, and the first active coating is arranged in the first coating area. In the winding structure, the portion of the first empty foil area away from the first coating area is flattened to form a first flattened area, and the first flattened area serves as the first pole 220.

[0078] In some embodiments, the second pole piece includes a second current collector and a second active coating, the second current collector includes a second coating area and a second empty foil area, the second active coating is arranged in the second coating area, and the portion of the second empty foil area away from the second coating area is flattened to form a second flattened area, and the second flattened area serves as the second pole 230.

[0079] In some embodiments, the first electrode 220 is a positive electrode and the second electrode 230 is a negative electrode.

[0080] In some embodiments, the first electrode 220 is a negative electrode, and the second electrode 230 is a positive electrode.

[0081] In some embodiments, the cylindrical battery 001 also includes a current collecting plate 400, which is disposed in the accommodating cavity 110 and between the electrode assembly 200 and the bottom wall 120. The current collecting plate 400 electrically connects the first pole 220 of the electrode assembly 200 and the bottom wall 120 of the shell 100 to improve the electrical connection stability between the electrode assembly 200 and the shell 100.

[0082] The current collecting plate 400 is provided with a second through hole 410, and the second through hole 410 communicates with the groove 122 and the center hole 210. Since the current collecting plate 400 is attached to the inner surface of the bottom wall 120, the current collecting plate 400 partially covers the groove 122. By providing the second through hole 410 in the current collecting plate 400, when the cylindrical battery 001 is injected, the electrolyte can flow through the second through hole 410 of the current collecting plate 400 to the center hole 210 of the electrode assembly 200, thereby achieving smooth injection.

[0083] See also Figure 2 and Figure 4 In some embodiments, the bottom wall 120 includes a central region 123, and the central region 123 is connected to the current collecting plate 400. Specifically, the inner surface of the central region 123 of the bottom wall 120 is welded to the current collecting plate 400, thereby improving the stability of the electrical connection. In some embodiments, the welding method can be ultrasonic welding or resistance welding.

[0084] See also Figure 2 , Figure 3 , Figure 4 and Figure 5The groove 122 includes a first section 1221 and a second section 1222, and the second section 1222 connects the first section 1221 and the first through hole 121. The first section 1221 surrounds at least part of the central area 123 and connects the second through hole 410. Along the axial direction Z of the cylindrical battery 001, the projection of the central area 123 overlaps with the central hole 210. In the process of injecting liquid into the cylindrical battery 001, the first through hole 121, the second section 1222, the first section 1221, the second through hole 410 and the central hole 210 form an injection channel, and the electrolyte can enter the cylindrical battery 001 along the injection channel, thereby improving the injection efficiency of the cylindrical battery 001.

[0085] In some embodiments, the first section 1221 surrounds at least a portion of the central area 123, which means that the first section 1221 surrounds the central area 123. That is, after the current collecting plate 400 is welded to the bottom wall 120, an annular flow channel is formed around the central area 123, and the second through hole 410 of the current collecting plate 400 is connected to the annular flow channel.

[0086] See also Figure 2 , Figure 3 , Figure 4 and Figure 6 In some embodiments, the first section 1221 surrounds at least a portion of the central area 123, which means that the first section 1221 does not completely surround the central area 123, but partially surrounds the central area 123. That is, after the current collecting plate 400 is welded to the bottom wall 120, a "C"-shaped flow channel is formed around the central area 123, and the second through hole 410 of the current collecting plate 400 is connected to the "C"-shaped flow channel.

[0087] See also Figure 2 , Figure 3 , Figure 4 and Figure 7 In some embodiments, the groove 122 further includes a third section 1223 and a fourth section 1224. The third section 1223 is arranged around the first section 1221 and communicates with the first through hole 121. There are multiple fourth sections 1224, and each fourth section 1224 communicates with the first section 1221 and the third section 1223. The electrolyte injected into the first through hole 121 can be diverted through the third section 1223, reducing the injection flow pressure of the second section 1222, and injecting the electrolyte from the first section 1221 and the multiple fourth sections 1224 into the central hole 210, thereby improving the injection efficiency.

[0088] In some embodiments, the third section 1223 is arranged around the first section 1221, which means that the third section 1223 surrounds the first section 1221. That is, after the current collecting plate 400 is welded to the bottom wall 120, an annular flow channel is formed between the third section 1223 and the current collecting plate 400, and the second section 1222 and each fourth section 1224 are connected to the annular flow channel. So that the path from the first through hole 121 to the central area 123 is arranged in parallel, that is, if one or more channels in the second section 1222 or multiple fourth sections 1224 are blocked, the electrolyte can pass through the third section 1223, flow into the unblocked channels in the second section 1222 or multiple fourth sections 1224, and flow into the accommodating cavity 110, to achieve liquid injection, thereby improving the stability of liquid injection.

[0089] See also Figure 2 , Figure 3 , Figure 4 and Figure 8 In some embodiments, the third section 1223 is disposed around the first section 1221, which means that the third section 1223 does not completely surround the first section 1221. That is, after the current collecting plate 400 is welded to the bottom wall 120, a "C"-shaped flow channel is formed between the third section 1223 and the current collecting plate 400, and the second section 1222 and each fourth section 1224 are connected to the "C"-shaped flow channel.

[0090] In some embodiments, the second section 1222 and the fourth section 1224 are symmetrically distributed around the center of the central area 123 , so that the interval between the second section 1222 and the fourth section 1224 is uniform, thereby improving the structural strength of the bottom wall 120 .

[0091] See also Figure 4 , Figure 7 and Fig. 9 There are multiple second through holes 410 on the current collecting plate 400. Along the axial direction Z of the cylindrical battery 001, the projection of each second through hole 410 overlaps with the projection of the first section 1221, which is beneficial to improving the efficiency of the electrolyte passing through the second through holes 410 of the current collecting plate 400 from the first section 1221 and entering the center hole 210.

[0092] In some embodiments, there are three second through holes 410 on the current collecting plate 400 , and each second through hole 410 corresponds to the second section 1222 or the fourth section 1224 of the communicating groove 122 .

[0093] In some embodiments, the depth of the groove 122 is h mm, and the thickness of the bottom wall 120 is H mm, satisfying 1 / 6≤h / H≤2 / 5, 0.6≤H≤1.5. The thickness of the bottom wall 120 is set between 0.6 mm and 1.5 mm. By controlling the ratio of the depth of the groove 122 to the thickness of the bottom wall 120 between 1 / 6 and 2 / 5, it is beneficial to improve the injection efficiency of the groove 122 while taking into account the structural strength of the bottom wall 120.

[0094] In some embodiments, the thickness H of the bottom wall 120 has a value of any one of 0.6, 0.65, 0.7, 0.75, 0.8, 0.85, 0.9, 0.95, 1, 1.05, 1.1, 1.15, 1.2, 1.25, 1.3, 1.35, 1.4, 1.45, and 1.5.

[0095] In some embodiments, the material of the bottom wall 120 includes steel, 1 / 6≤h / H≤1 / 3; or the material of the bottom wall 120 includes aluminum, 1 / 5≤h / H≤2 / 5. When the material of the bottom wall 120 is steel, the ratio of the depth of the groove 122 to the thickness of the bottom wall 120 is controlled between 1 / 6 and 1 / 3, and when the material of the bottom wall 120 is aluminum, the ratio of the depth of the groove 122 to the thickness of the bottom wall 120 is controlled between 1 / 5 and 2 / 5, which is conducive to improving the injection efficiency of the groove 122 while taking into account the structural strength of the bottom wall 120.

[0096] The thickness H of the bottom wall 120 and the depth h of the groove 122 are tested as follows:

[0097] The bottom wall 120 has a flat area without the groove 122 . Ten first test areas are randomly selected from the flat area. The heights of the ten first test areas are tested using a height gauge and the average value is taken to obtain the thickness H of the bottom wall 120 .

[0098] Ten second test areas are randomly selected on the bottom surface of the groove 122 , and the heights of the ten second test areas from the upper surface of the bottom wall 120 are measured using a height gauge and the average value is taken to obtain the depth h of the groove 122 .

[0099] In some embodiments, the width of the groove 122 is k mm, satisfying 1≤k≤5. The width of the groove 122 is set between 1 mm and 5 mm, which is conducive to the rapid flow of the electrolyte from the groove 122 to the central hole 210. In some embodiments, the value of the width k of the groove 122 is 1, 1.1, 1.2, 1.3, 1.4, 1.5, 1.6, 1.7, 1.8, 1.9, 2, 2.1, 2.2, 2.3, 2.4, 2.5, 2.6, 2.7, 2.8, 2.9, 3, 3.1, 3.2, 3.3, 3.4, 3.5, 3.6, 3.7, 3.8, 3.9, 4, 4.1, 4.2, 4.3, 4.4, 4.5, 4.6, 4.7, 4.8, 4.9, 5.

[0100] The width k of the groove 122 can be measured by a vernier caliper or by a CCD image measuring instrument. After the housing 100 is positioned, the CCD image measuring instrument can obtain the width k of the groove 122 by taking a picture of the groove 122 and calculating.

[0101] In some embodiments, the diameter of the cylindrical battery 001 is 17-65 mm.

[0102] See also Figure 2 , Figure 3 and Fig.10 In some embodiments, the cylindrical battery 001 further includes a sealing member 500 , which is disposed on the outer surface of the bottom wall 120 and seals the first through hole 121 .

[0103] In some embodiments, the sealing member 500 is a sealing pin that is welded to the bottom wall 120 to seal the first through hole 121 .

[0104] In some embodiments, the sealing member 500 is a polymer film that is bonded to the bottom wall 120 to seal the first through hole 121 .

[0105] See also Figure 1 and Fig.11 One embodiment of the present application further provides an electric device 002, comprising the cylindrical battery 001 in one or more of the above embodiments.

[0106] For ordinary technicians in this field, various other corresponding changes and modifications can be made according to the technical concept of this application, and all these changes and modifications should fall within the protection scope of the claims of this application.

Claims

1. A cylindrical battery, characterized in that: include: A housing having a receiving cavity, wherein the housing comprises a bottom wall; An electrode assembly, disposed in the accommodating cavity, wherein the electrode assembly has a central hole; The bottom wall is provided with a first through hole, and along the axial direction of the cylindrical battery, the projection of the first through hole is separated from the projection of the center hole. The bottom wall is also provided with a groove on the side facing the electrode assembly, and the groove connects the first through hole and the center hole.

2. The cylindrical battery according to claim 1, characterized in that: Also includes: A current collecting plate, disposed in the accommodating cavity, the current collecting plate being disposed between the electrode assembly and the bottom wall, and connecting the electrode assembly and the bottom wall; The collecting plate is provided with a second through hole, and the second through hole communicates with the groove and the central hole.

3. The cylindrical battery according to claim 2, characterized in that: The bottom wall includes a central area, the central area is connected to the current collecting plate, and along the axial direction of the cylindrical battery, the projection of the central area overlaps with the projection of the central hole; The groove includes a first section and a second section, the first section surrounds at least a portion of the central area and communicates with the second through hole, and the second section communicates with the first section and the first through hole.

4. The cylindrical battery according to claim 3, characterized in that: The groove further includes a third section and a fourth section. The third section is arranged around the first section and communicated with the first through hole. There are a plurality of fourth sections, and each of the fourth sections is connected with the first section and the third section.

5. The cylindrical battery according to claim 4, characterized in that: The third section is arranged around the central area.

6. The cylindrical battery according to claim 4, characterized in that: The second section and the fourth section are symmetrically distributed around the center of the central area.

7. The cylindrical battery according to claim 4, characterized in that: There are a plurality of the second through holes, and along the axial direction of the cylindrical battery, the projection of each of the second through holes overlaps with the projection of the first segment.

8. The cylindrical battery according to claim 1, characterized in that: The depth of the groove is h mm, and the thickness of the bottom wall is H mm, satisfying 1 / 6≤h / H≤2 / 5, 0.6≤H≤1.

5.

9. The cylindrical battery according to claim 8, characterized in that: The material of the bottom wall includes steel, 1 / 6≤h / H≤1 / 3; or The material of the bottom wall includes aluminum, 1 / 5≤h / H≤2 / 5.

10. The cylindrical battery according to claim 1, characterized in that: The width of the groove is k millimeters, satisfying 1≤k≤5; and / or the diameter of the cylindrical battery is 17-65 mm.

11. An electrical device, characterized in that: Comprising a cylindrical battery as claimed in any one of claims 1 to 10.

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