Secondary battery and electronic device

Abstract

The utility model provides a secondary battery which comprises a shell which comprises an end wall with a first assembly hole; the split type lower plastic cement is provided with a first split body and a second split body, the first split body is provided with a second assembly hole corresponding to the first assembly hole, the second split body is provided with a through hole, and the first split body is provided with a central part penetrating out of the through hole and a bearing part extending out of the central part and used for bearing the second split body; wherein in the first direction pointing to the interior of the shell along the axis of the second assembly hole, the second split body is provided with a blocking piece, the blocking piece protrudes towards the interior of the shell compared with the first split body, and in the radial direction of the second assembly hole, the distance of the space spaced between the blocking piece and the bearing part is W1, the distance of the space between the through hole of the second split body and the central part is W2, and W2 is larger than W1. The utility model aims to provide a secondary battery and an electronic device so as to at least prevent the second split body from falling off from the first split body due to impact in the mounting process.

Description

Technical Field

[0001] This utility model relates to a secondary battery and an electronic device. Background Technology

[0002] In the field of new energy power batteries, the application of secondary batteries is becoming increasingly widespread. For example, secondary batteries (such as lithium-ion batteries) can be used in electronic devices such as cars, energy storage, mobile phones, tablets, wearable devices, power banks, e-cigarettes, digital products, power tools, power devices, and energy storage devices. Utility Model Content

[0003] In view of the problems existing in the related technologies, the purpose of this utility model is to provide a secondary battery and electronic device, so as to at least prevent the first plastic part of the split type from falling out of the through hole of the second part due to impact during the installation process.

[0004] To achieve the above objectives, this utility model provides a secondary battery, comprising: a casing including an end wall having a first mounting hole; a split lower plastic contacting the lower surface of the end wall facing the interior of the casing, the split lower plastic having a first part and a second part, the first part having a second mounting hole corresponding to the first mounting hole, the second part having a through hole, the first part having a central portion extending through the through hole, and a supporting portion extending from the central portion to support the second part; an electrode post including a columnar portion and an inner flange, the columnar portion passing through the first mounting hole and the second mounting hole, the inner flange being connected to one end of the columnar portion located inside the casing and together with the end wall clamping the split lower plastic; wherein, in a first direction along the axis of the second mounting hole pointing towards the interior of the casing, the second part has a blocking member, the blocking member protruding towards the interior of the casing compared to the first part, wherein, in the radial direction of the second mounting hole, the distance between the blocking member and the supporting portion is W1, and the distance between the through hole and the central portion of the second part is W2, W2 being greater than W1.

[0005] In some embodiments, W1 is in the range of 0.2mm-5mm.

[0006] In some embodiments, the blocking member is a boss, which is a continuous annular protrusion or a plurality of protrusions spaced apart from each other around the second mounting hole.

[0007] In some embodiments, the second part has a radially extending extension outside the space, the entire extension protruding from the lower surface of the first part to form a boss.

[0008] In some embodiments, along the first direction, the distance by which the blocking member protrudes from the bearing portion of the first split is H1, where H1 is in the range of 0.05mm-1.5mm.

[0009] In some embodiments, the device further includes an electrode assembly located in the housing and a first collector plate located between the electrode assembly and the electrode post. Along a first direction, the blocking member does not protrude beyond the lowest point of the inner flange, and the height difference between the lower surface of the blocking member and the lowest point of the inner flange is H2, where H2 is in the range of 0-1.0 mm.

[0010] In some embodiments, a protruding portion is provided on the support portion of the first split, the protruding portion protruding toward the interior of the housing, and the lowest point of the first split is the lowest point on the bottom surface of the protruding portion. In the first direction, the height difference between the lowest point of the first split and the lowest point of the second split is H3, and H3 is in the range of 0.05mm-1.5mm.

[0011] In some embodiments, the first and second parts are made of different plastics and have different melting points.

[0012] In some embodiments, the inner flange and the end wall together clamp the first part, and the inner flange directly contacts the first part.

[0013] Embodiments of this application also provide an electronic device including any of the above-described secondary batteries.

[0014] The beneficial technical effects of this utility model are at least as follows:

[0015] In this embodiment, in a first direction pointing inward from the axis of the second mounting hole toward the interior of the housing, the second split has a blocking member that protrudes inward toward the housing compared to the first split. In the radial direction of the second mounting hole, the distance between the blocking member and the supporting portion is W1, and the distance between the through hole of the second split and the central portion is W2, where W2 is greater than W1. This at least prevents the second plastic split from detaching from the first split due to impacts during installation. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 A schematic diagram is shown when the electronic device according to an embodiment of this application is a vehicle.

[0018] Figure 2 A perspective view of a secondary battery according to an embodiment of this application is shown.

[0019] Figure 3A top view schematic diagram of a secondary battery according to an embodiment of this application is shown.

[0020] Figure 4A A partial cross-sectional schematic diagram of a prior art secondary battery is shown.

[0021] Figure 4B It shows Figure 3 Partial sectional view of section AA.

[0022] Figure 5 It shows Figure 4B A magnified view of a portion of region B in the middle.

[0023] Figure 6 Another partial cross-sectional schematic diagram of a secondary battery according to an embodiment of this application is shown.

[0024] Figure 7 A cross-sectional schematic diagram of a split-type lower plastic according to an embodiment of this application is shown.

[0025] Figure 8 A bottom view schematic diagram of a split-type lower plastic according to an embodiment of this application is shown.

[0026] Figure 9 A cross-sectional schematic diagram of a split-type lower plastic according to an embodiment of this application is shown.

[0027] Figure 10 A bottom view schematic diagram of another split-type lower plastic according to an embodiment of this application is shown.

[0028] Figure 11 A cross-sectional schematic diagram of another split-type lower plastic according to an embodiment of this application is shown.

[0029] Figure 12 A cross-sectional schematic diagram of another split-type lower plastic according to an embodiment of this application is shown. Detailed Implementation

[0030] To better understand the spirit of the embodiments of this application, the following description is based on some preferred embodiments of this application.

[0031] Embodiments of this application will be described in detail below. Throughout this specification, identical or similar components and components having identical or similar functions are indicated by similar reference numerals. The embodiments described herein with reference to the accompanying drawings are illustrative and diagrammatic in nature and are intended to provide a basic understanding of this application. The embodiments of this application should not be construed as limiting this application.

[0032] As used herein, the terms “approximately,” “generally,” “substantially,” and “about” are used to describe and indicate minor variations. When used in conjunction with an event or situation, these terms may refer to examples in which the event or situation occurred precisely or in examples in which the event or situation occurred very approximately.

[0033] In this specification, unless otherwise specified or limited, relative terms such as “central,” “longitudinal,” “lateral,” “front,” “rear,” “right,” “left,” “inner,” “outer,” “lower,” “higher,” “horizontal,” “vertical,” “above,” “below,” “above,” “below,” “top,” “bottom,” and their derivatives (e.g., “horizontally,” “downward,” “upward,” etc.) should be interpreted as referring to the directions described in the discussion or depicted in the accompanying drawings. These relative terms are used for descriptive convenience only and do not require that this application be constructed or operated in a particular orientation.

[0034] For ease of description, "first," "second," "third," etc., can be used in this article to distinguish different components of a figure or a series of figures. "First," "second," "third," etc., are not intended to describe the corresponding components.

[0035] This utility model provides an electronic device 1000. In some embodiments, the electronic device 1000 may include a battery pack, a battery group 1002, an electric vehicle, an energy storage cabinet, etc. For ease of explanation, the following embodiments will use a vehicle as an example to illustrate the electronic device 1000. Figure 1 A schematic diagram of an electronic device according to an embodiment of this application is shown when it is a vehicle. See also Figure 1The vehicle's interior may also include another electronic device 1000, which can be a battery pack 1002. The battery pack 1002 may be located at the bottom, front, or rear of the vehicle body 1001. The battery pack 1002 can be used to power the vehicle; for example, it can serve as the vehicle's operating power source. The working part of the electronic device 1000 is electrically connected to the battery pack 1002 to obtain electrical power. The vehicle may be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. New energy vehicles may be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, but are not limited thereto. The working part is the vehicle body, and the battery pack 1002 is located at the bottom of the vehicle body, providing electrical power for the vehicle's operation or the operation of its internal electrical components. However, in some other embodiments, the electronic device 1000 may also be a mobile phone, portable device, laptop computer, ship, spacecraft, electric toy, and power tool, etc. Spacecraft include airplanes, rockets, space shuttles, and spacecraft, etc.; the working part can obtain electrical power from the battery pack 1002 and perform corresponding functions, such as a fan blade rotation unit or a vacuum cleaner's suction unit. Electric toys include stationary or mobile electric toys, such as game consoles, electric car toys, electric boat toys, and electric airplane toys, etc.; power tools include metal cutting power tools, grinding power tools, assembly power tools, and railway power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers, etc. This application does not impose any special limitations on the aforementioned electronic device 1000.

[0036] Figure 2 A perspective view of a secondary battery according to an embodiment of this application is shown. Figure 3 A top view schematic diagram of a secondary battery according to an embodiment of this application is shown. Figure 4B It shows Figure 3 Partial sectional view of section AA. Figure 5 It shows Figure 4B A magnified view of a portion of region B. (See also...) Figure 3 , Figure 4B and Figure 5This application provides a secondary battery 100, which includes a housing 200, an electrode assembly located within the housing 200, a first / second current collector, and terminal posts 50 mounted on the housing 200. The housing 200 includes an end wall 111 and side walls surrounding the end wall 111. The housing 200 can be formed in various ways, such as integral stamping, integral casting, or separate welding, as long as a stable seal and electrical connection can be established. A receiving cavity is formed within the housing 200 to accommodate the electrode assembly, electrolyte, first / second current collector, and other necessary battery components. Specifically, the diameter of the housing 200 can be determined according to the specific dimensions of the electrode assembly. The housing 200 can be made of various materials, such as copper, iron, aluminum, steel, or aluminum alloy. To prevent rusting during long-term use, a rust-preventive material such as metallic nickel can be plated onto the surface of the housing 200. The secondary battery 100 can be a cylindrical battery, such as a 4680 cylindrical battery with a height of 80mm and a diameter of 46mm; or a battery with a height of 15mm and a diameter of 46mm.

[0037] Electrode assemblies are components in the secondary battery 100 where electrochemical reactions occur. The housing 200 may contain one or more electrode assemblies. The electrode assembly is a wound or stacked electrode assembly, including a stacked and / or wound positive electrode, a first separator, a negative electrode, and a second separator. The positive electrode includes a positive current collector and a positive active material layer coated on the positive current collector. A first coated area coated with the positive active material layer and a first uncoated area without the positive active material layer are formed on the positive current collector. The first coated area and the first uncoated area are arranged along the height direction of the electrode assembly. The first uncoated area extends beyond the separator at one end in the height direction of the secondary battery 100, forming a bent positive electrode tab. The negative electrode includes a negative current collector and a negative active material layer coated on the negative current collector. A second coated area with the negative active material layer and a second uncoated area without the negative active material layer are formed on the negative current collector. The second coated area and the second uncoated area are arranged along the height direction of the electrode assembly. The second uncoated area also extends towards one end of the secondary battery 100 in the height direction to the outside of the separator, forming a bent negative electrode tab. The first separator and the second separator are disposed between the positive electrode and the negative electrode to isolate the positive and negative active material layers. Taking the lithium-ion secondary battery 100 as an example, the material of the positive current collector can be aluminum, and the positive active material layer includes positive active material, which can be lithium cobalt oxide, lithium iron phosphate, ternary lithium, or lithium manganese oxide, etc. The material of the negative current collector can be copper, and the negative active material layer includes negative active material, which can be carbon or silicon, etc. The substrate material of the first separator and the second separator can be PP (polypropylene) or PE (polyethylene), etc. To protect and insulate the electrode assembly, an insulating film can be wrapped around the outside of the electrode assembly. The insulating film can be synthesized from PP, PE, PET, PVC or other polymer materials.

[0038] refer to Figure 5In some embodiments, the end wall 111 has a first mounting hole 1110, the upper plastic 121 contacts the surface of the end wall 111 facing the outside of the housing 200, and the split lower plastic 131 contacts the surface of the end wall 111 facing the inside of the housing 200. The upper plastic 121 has a third mounting hole 1210 corresponding to the first mounting hole 1110, and the split lower plastic 131 has a second mounting hole 1310 corresponding to the first mounting hole 1110 and the second mounting hole 1210. In some embodiments, the pole post 50 includes an outer flange 51, a columnar portion 52, and an inner flange 53. The outer flange 51 is located outside the housing 200, and the columnar portion 52 passes through the first mounting hole 1110, the second mounting hole 1210, and the third mounting hole 1310. The outer flange 51 is connected to the end of the columnar portion 52 of the electrode post 50 located outside the housing 200, and the inner flange 53 is connected to the end of the columnar portion 52 of the electrode post 50 located inside the housing 200. The inner flange 53 and the end wall 111 together clamp the split lower plastic 131, and the outer flange 51 and the end wall 111 together clamp the upper plastic 121. The inner flange 53 of the electrode post 50 contacts the surface of the split lower plastic 131 facing the electrode assembly / the surface away from the end wall 111 and fixes the split lower plastic 131 to the inner side of the end wall 111 facing the inside of the housing 200. The outer flange 51 of the electrode post 50 contacts the surface of the upper plastic 121 away from the end wall 111 and fixes the split lower plastic 131 to the outer side of the end wall 111 away from the inside of the housing 200. The upper plastic 121 and the split lower plastic 131 surround the columnar portion 52. The split-type lower plastic 131 has a first split 1311 and a second split 1312. It can be understood that the first split 1311 has a second mounting hole 1310 corresponding to the first mounting hole 1110, and the second split 1312 has a through hole 1315. The first split 1311 has a central portion 1318 extending through the through hole 1315, and a supporting portion 1319 extending from the central portion 1318 to support the second split 1312. It can also be understood that the first split 1311 and the second split 1312 are stacked together, with the central portion 1318 of the first split 1311 passing through the through hole 1315 through the second split 1312, and the supporting portion 1319 of the first split 1311 supporting the second split 1312. The second part 1312 has a blocking member 1313 facing the interior of the housing 200. In a first direction F along the axis of the second mounting hole 1310 pointing towards the interior of the housing 200, the blocking member 1313 protrudes relative to the first part 1311 by a distance H1. In the radial direction of the second mounting hole 1310, a space 140 is spaced between the blocking member 1313 and the support portion 1319 (see example...). Figure 7 The distance to the space shown (140) is W1. This can be understood as... Figure 5 The diagram shows the blocking member 1313 disposed on the lowest bottom surface of the second part 1312 facing the interior of the housing 200. In some embodiments, for example... Figure 6In the partial cross-sectional schematic diagram of the secondary battery 200 according to an embodiment of this application, the blocking member 1313 is also provided on the second part 1312. To enhance the cooperation between the first part 1311 and the second part 1312, a protruding portion 1317 is provided on the supporting portion 1319 of the first part 1311. The protruding portion 1317 protrudes towards the interior of the housing 200. By providing the protruding portion 1317, the cooperation between it and the blocking member 1313 is strengthened, thereby enhancing the blocking effect of the blocking member 1313. Furthermore, at this time, the lowest point of the first part 1311 is the lowest point on the bottom surface of the protruding portion 1317. It can be understood that along the first direction F, the height difference between the lowest point of the first part 1311 and the lowest point of the second part 1312 is H3, and H3 is in the range of 0.05mm-1.5mm. In some embodiments, along the first direction F, the blocking member 1313 does not protrude beyond the lowest point of the inner flange 53, and the height difference between the lower surface of the blocking member 1313 and the lowest point of the inner flange 53 is H2, where H2 is in the range of 0-1.0 mm, preferably 0.1 mm-0.6 mm. Since the first current collector and electrode assembly of the secondary battery 100 are disposed below the inner flange 53, and the first current collector is located between the electrode assembly and the terminal post 50, the blocking member 1313 is configured not to contact the first current collector and electrode assembly. In some embodiments, the plastic materials of the first split body 1311 and the second split body 1312 are different and have different melting points. In some embodiments, the inner flange 53 and the end wall 111 together clamp the first split body 1311, and the inner flange 53 directly contacts the first split body 1311.

[0039] Figure 4AA partial cross-sectional schematic diagram of a prior art secondary battery is shown. It can be understood that the prior art secondary battery is similar to the secondary battery 100 of this application, and also has a split plastic 500. It can be understood that the split plastic 500 has a first part 501 and a second part 502. Similar to the first part 1311 and the second part 1312 of the secondary battery 100 of this application, before the split plastic 500 is loaded into the housing, the first part 501 is first placed on a tooling, and then the second part 502 is placed on the tooling. The first part 501 is fixed by the tooling, while the second part 502 is movably stacked on the first part 501. Due to the mutual collisions between the tooling containing different split plastic 500 parts, in the radial direction of the inner hole of the second part 502, the distance between the inner edge 503 of the movable second part 502 protruding from the first part 501 and the first split 501 is Wa, and the distance between the inner edge of the inner hole of the second part 502 and the outer edge of the stepped upper surface 505 of the first part 501 is Wb. It is understandable that, generally speaking, the height difference between the stepped upper surface 505 and the upper surface of the second part 502 is small. When the second part 502 is subjected to impact force and moves radially, the outer edge of the stepped upper surface 505 cannot provide adequate blocking. Furthermore, since Wa is generally greater than Wb, the radial movement distance of the second part 502 may exceed Wa but not exceed Wb. This causes the inner edge of the inner hole of the second part 502 to extend beyond the outer edge of the first part 501, resulting in the second part 502 detaching from the first part 501.

[0040] To further understand this invention, please continue to refer to the following: Figure 5 and Figure 7 , Figure 7 A cross-sectional schematic diagram of the split-type lower plastic 131 according to an embodiment of this application is shown. It can be understood that, since the split-type lower plastic 131 includes a first part 1311 and a second part 1312, during the formation of the split-type lower plastic 131, the first part 1311 and the second part 1312 are generally fed separately on the automatic assembly line of the secondary battery 100. Due to the high speed of the automatic assembly line, there will be collisions between the tooling on the assembly line, causing the second part 1312 to be subjected to impact forces. Figure 7The diagram shows a schematic of the split-type plastic 131 and the columnar portion 52 (not shown) of the pole post 50 before assembly. Generally, the second mounting hole 1310 of the first split 1311 and the through hole 1315 of the second split 1312 are coaxial after being assembled to the columnar portion 52, and the inner flange 53 (not shown) carries the first split 1311. However, when forming the split-type plastic 131, since the first split 1311 is compressed by being clamped by the inner flange 53 and the end wall 111 when it is assembled to the housing 200 and the pole post 50, a space 140 needs to be provided between the first split 1311 and the second split 1312 to accommodate the compressed first split 1311. When the second split 1312 is subjected to the aforementioned impact force due to tooling impact, the second split 1312 may produce radial displacement relative to the axis of the second mounting hole 1310 of the first split 1311. Although the central portion of the first segment 1311 passes through the through hole 1315 of the second segment 1312, and the second segment 1312 is stacked on the first segment 1311 and supported by the outer edge of the first segment 1311, when the second segment 1312 produces the aforementioned radial displacement, the minimum radial inner edge of the second segment 1312 may displace beyond the maximum radial outer edge of the first segment 1311 and detach from the first segment 1311. To solve the above problems, a blocking member 1313 is provided on the lower surface of the second part 1312, so that the lower surface of the second part 1312 with the blocking member 1313 protrudes from the lower surface of the first part 1311 when assembled into the housing. The distance W1 is between the blocking member 1313 and the space 140 between the supporting portion 1319 of the first part 1311 and the second mounting hole 1310 in the radial direction. The distance W2 is between the through hole 1315 of the second part 1312 and the central portion 1318 of the first part 1311. It can be understood that W1 defines the space 140 between the supporting portion 1319 of the first part 1311 and the blocking member 1313 of the second part 1312, and W2 defines the space between the central portion 1318 of the first part 1311 and the through hole 1315 of the second part 1312. The size of W1 is set to be less than W2 to prevent the second part 1312 from falling off the first part 1311. It can be understood that by setting the distance W2 between the through hole 1315 of the second part 1312 and the first part 1311 to be greater than the radial distance W1 from the blocking member 1313 to the first part 1311, the radial movable distance of the second part 1312 is controlled by the blocking member 1313 to be less than W1. Compared with Wa>Wb between the first part 501 and the second part 502 in the prior art, the possibility of the second part 1312 falling off the first part 1311 is reduced to a certain extent.Preferably, compared to the width X of the annular region formed by the stacking of the first segment 1311 and the second segment 1312, X > W2 > W1 or W2 > X > W1 can be used to further reduce the risk of the second segment 1312 falling off. Further, W1 is in the range of 0.2mm-5mm, preferably 0.5mm-2.5mm. It can be understood that in some embodiments, the distance by which the blocking member 1313 protrudes relative to the bearing portion 1319 of the first segment 1311 is H1, and H1 is in the range of 0.05mm-1.5mm, preferably 0.2mm-1.0mm.

[0041] See Figure 8 and Figure 9 , Figure 8 A bottom view schematic diagram of a split lower plastic 131 according to an embodiment of this application is shown. Figure 9 A cross-sectional schematic diagram of a split-type lower plastic 131 according to an embodiment of this application is shown. In some embodiments, the blocking member 1313 is a boss that continuously protrudes in an annular shape around the second mounting hole 1310. It can also be understood that in some embodiments, the blocking member 1313 constitutes an annular structure surrounding the second mounting hole 1310 and separating the second split 1312 into two parts with different thicknesses. See also Figure 10 and Figure 11 , Figure 10 A bottom view schematic diagram of another split-type lower plastic 131 according to an embodiment of this application is shown. Figure 11 A cross-sectional schematic diagram of another split-type lower plastic 131 according to an embodiment of this application is shown. In some embodiments, the blocking member 1313 is a plurality of protrusions spaced apart from each other surrounding the second mounting hole 1310.

[0042] See Figure 12 , Figure 12 A cross-sectional schematic diagram of another split-type lower plastic 131 according to an embodiment of this application is shown. The second split 1312 has an extension 1316 extending radially along the second mounting hole 1310 outside the space 140, the extension 1316 protruding entirely from the lower surface of the first split 1311 to form a boss. It can also be understood that, in some embodiments, the blocking member 1313 is formed by the extension 1316 formed by the entire lower surface of the second split 1312 protruding.

[0043] Embodiments of this application also provide an electronic device 1000, which includes a secondary battery 100 as described above, and the electronic device 1000 can have the beneficial effects described above regarding the secondary battery 100.

[0044] The above are merely preferred embodiments of this utility model and are not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A secondary battery characterized by comprising: The application relates to a secondary battery, comprising: a housing including an end wall having a first assembly hole; a split lower plastic in contact with a lower surface of the end wall facing the inside of the housing, the split lower plastic having a first split body and a second split body, the first split body having a second assembly hole corresponding to the first assembly hole, and the second split body having a through hole, the first split body having a central part penetrating through the through hole and a bearing part extending from the central part to bear the second split body; a pole column including a columnar part penetrating through the first assembly hole and the second assembly hole, and an inner flange connected to one end of the columnar part inside the housing and clamping the split lower plastic together with the end wall; wherein, in a first direction along the axis of the second assembly hole and pointing to the inside of the housing, the second split body has a barrier part protruding towards the inside of the housing compared with the first split body, wherein, in the radial direction of the second assembly hole, the distance of the space between the barrier part and the bearing part is W1, and the distance of the space between the through hole of the second split body and the central part is W2, and W2 is greater than W1.

2. The secondary battery according to claim 1, characterized by W1 is in the range of 0.2mm-5mm.

3. The secondary battery according to claim 1, wherein the barrier part is a boss, and the boss is annularly and continuously protruded or a plurality of protrusions spaced apart from each other around the second assembly hole.

4. The secondary battery according to claim 3, wherein the second split body has an extension part extending in the radial direction and located outside the space, and the whole of the extension part protrudes compared with the lower surface of the first split body to form the boss.

5. The secondary battery according to claim 1, wherein in the first direction, the distance of the barrier part protruding compared with the bearing part of the first split body is H1, and H1 is in the range of 0.05mm-1.5mm.

6. The secondary battery according to claim 1, characterized by further comprising an electrode assembly located in the housing, and a first current collector plate located between the electrode assembly and the pole column, in the first direction, the barrier part does not protrude beyond the lowest point of the inner flange, and the height difference between the lower surface of the barrier part and the lowest point of the inner flange is H2, and H2 is in the range of 0-1.0mm.

7. The secondary battery according to claim 1, characterized by a protruding part is arranged on the bearing part of the first split body, the protruding part protrudes towards the inside of the housing, and the lowest point of the first split body is the lowest point on the bottom surface of the protruding part, wherein, in the first direction, the height difference between the lowest point of the first split body and the lowest point of the second split body is H3, and H3 is in the range of 0.05mm-1.5mm.

8. The secondary battery according to claim 1, characterized by the materials and melting points of the plastics of the first split body and the second split body are different.

9. The secondary battery according to claim 1, characterized by the inner flange clamps the first split body together with the end wall, and the inner flange directly contacts the first split body.

10. An electronic device, comprising: the secondary battery according to any one of claims 1-9.

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