Cover plate assembly, battery cell and electronic device

Abstract

The utility model provides a cover plate assembly which is used for sealing a shell, an electrode assembly connected with an adapter sheet is accommodated in the shell, the cover plate assembly comprises a pole, the pole comprises a first pole branch far away from the electrode assembly and a second pole branch close to the electrode assembly, the first pole branch comprises a through hole, and the second pole branch comprises a blind hole communicated with the through hole; and the plugging piece is at least partially arranged in the blind hole and is used for plugging the blind hole. The utility model aims to provide a cover plate assembly, a battery cell, a battery pack and an electronic device, so as to at least improve the safety of the battery cell.

Description

TECHNICAL FIELD

[0001] The utility model relates to a kind of cover plate assembly, electric core and electronic device. BACKGROUND

[0002] Batteries are widely used in electronic devices, such as mobile phones, laptops, electric cars, electric cars, electric planes, electric ships, electric toy cars, electric toy ships, electric toy planes and electric tools, etc. The common batteries currently include cadmium-nickel batteries, hydrogen-nickel batteries, lithium-ion batteries and secondary alkaline zinc-manganese batteries, etc. Among them, lithium-ion batteries have become the mainstream power batteries for new energy vehicles due to their high specific energy, high specific power, long life, low cost and other advantages. SUMMARY

[0003] In view of the problems in the related art, the purpose of the utility model is to provide a cover plate assembly, an electric core and an electronic device to at least improve the safety of the electric core.

[0004] To achieve the above-mentioned purpose, the utility model provides a cover plate assembly for closing a shell, the shell containing an electrode assembly connected to an adapter piece, the cover plate assembly comprising: a pole including a first pole portion away from the electrode assembly and a second pole portion close to the electrode assembly, the first pole portion including a through hole, and the second pole portion including a blind hole passing through the through hole; and a plugging member at least partially disposed in the blind hole and used for plugging the blind hole.

[0005] In some embodiments, the closed end of the blind hole is welded to the adapter piece, and the plugging member blocks the connecting channel between the closed end and the bonding surface between the first pole portion and the second pole portion.

[0006] In some embodiments, the plugging member is contained in at least a part of the hole section of the blind hole, and the plugging member is welded at the connecting surface with the at least a part of the hole section.

[0007] In some embodiments, the blind hole has a counterbore on the side facing the through hole, and the edge portion of the plugging member is placed on the counterbore and welded to the second pole portion at the counterbore.

[0008] In some embodiments, the plugging member is spaced apart from the closed end in a direction pointing from the through hole to the blind hole.

[0009] In some embodiments, the cover plate assembly further comprises: a cover plate body having a through cover plate through hole, and the pole is arranged in the cover plate through hole; a sealing ring is arranged between the cover plate body and the pole to seal the connection between the cover plate body and the pole, and the sealing ring surrounds and seals the bonding surface.

[0010] In some embodiments, the first pole post subpart comprises a first columnar part and a first flange, the second pole post subpart comprises a second columnar part and a second flange, the first columnar part and the second columnar part are arranged in the through hole of the cover plate, the first flange and the second flange clamp the body of the cover plate and the sealing ring, and the contact surface of the sealing ring with the second flange is lower than the joint surface in the direction from the second pole post subpart to the first pole post subpart.

[0011] In some embodiments, the sealing member is a glue covering the closed end of the blind hole and the side wall of the at least partial hole segment connected with the closed end.

[0012] Embodiments of the present application also provide an electronic device comprising the above-mentioned battery cell.

[0013] Embodiments of the present application also provide an electronic device comprising the above-mentioned battery cell.

[0014] The beneficial technical effects of the present application are as follows:

[0015] The sealing member of the embodiments of the present application is arranged at least partially in the blind hole and used for sealing the blind hole, so as to seal the leakage route of the electrolyte, and thus the electrolyte leakage will not cause corrosion, and the safety of the battery cell is improved. BRIEF DESCRIPTION OF DRAWINGS

[0016] In order to more clearly illustrate the technical solutions of the embodiments of the present application or the prior art, the drawings needed in the embodiments or the prior art description will be briefly introduced as follows. Obviously, the drawings in the following description are some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor.

[0017] Figure 1 A schematic view of the electronic device according to the embodiments of the present application is shown when the electronic device is a vehicle.

[0018] Figure 2 An exploded view of the cover plate assembly according to the first embodiment of the present application is shown.

[0019] Figure 3 A top view of the cover plate assembly according to the first embodiment of the present application, and a sectional view taken along the AA line of the top view are shown.

[0020] Figure 4 An enlarged view of the area B of the sectional view of Figure 3 is shown.

[0021] Figure 5 A perspective view of the pole post according to the first embodiment of the present application is shown.

[0022] Figure 6 A top view of the pole according to the first embodiment of this application and a cross-sectional view taken along the CC line of the top view are shown.

[0023] Figure 7 A perspective view of a sealing member according to a first embodiment of this application is shown.

[0024] Figure 8 A top view of the sealing member according to the first embodiment of this application and a cross-sectional view taken along line DD of the top view are shown.

[0025] Figure 9 An exploded view of a cover plate assembly according to a second embodiment of this application is shown.

[0026] Figure 10 A top view of a cover plate assembly according to a second embodiment of this application and a cross-sectional view taken along line EE of the top view are shown.

[0027] Figure 11 It shows Figure 10 An enlarged view of region F of the cross-sectional diagram.

[0028] Figure 12 A perspective view of the pole according to the second embodiment of this application is shown.

[0029] Figure 13 A top view of the pole according to the second embodiment of this application and a cross-sectional view taken along the GG line of the top view are shown.

[0030] Figure 14 A perspective view of a sealing member according to a second embodiment of this application is shown.

[0031] Figure 15 A top view of the sealing member according to the second embodiment of this application and a cross-sectional view taken along line HH of the top view are shown. Detailed Implementation

[0032] To better understand the spirit of the embodiments of this application, the following description is based on some preferred embodiments of this application.

[0033] 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.

[0034] As used herein, the terms "approximately," "about," "substantially" and "near" are used to describe and account for small variations. When utilized in connection with an event or circumstance, the terms can refer to instances in which the event or circumstance occurs exactly, and instances in which the event or circumstance occurs in close proximity.

[0035] In this description, relative terms such as "central," "longitudinal," "lateral," "forward," "rearward," "rightward," "leftward," "internal," "external," "lower," "upper," "horizontal," "vertical," "above," "below," "top," "bottom," and derivatives thereof (e.g., "horizontally," "downwardly," "upwardly," etc.) should be construed to refer to the orientation as then described or as shown in the drawing under discussion. These relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures.

[0036] For the purposes of this description, "first," "second," "third," etc. can be used herein to describe different components of one figure or a group of figures. "First," "second," "third," etc. are not intended to denote a corresponding component.

[0037] The prior art negative pole post includes a copper conductive part and an aluminum conductive part close to the electrode assembly, and a blind hole is formed in the pole post to reduce the thickness at the welding position before the pole post and the adapter plate are welded, so that the bottom of the blind hole (the thinned bottom plate of the pole post) can be welded with the adapter plate by laser penetration welding. In the process of welding the pole post and the adapter plate from the outside of the pole post, the bottom plate of the pole post is easily welded through, causing electrolyte to leak from the position where the pole post is welded through, and the leaked electrolyte corrodes the copper-aluminum bonding surface between the copper conductive part and the aluminum conductive part, causing the copper-aluminum bonding surface to be corroded and broken, resulting in failure of the battery cell.

[0038] The utility model provides a kind of electronic device 1000, the following embodiment is for the convenience of explanation, and electronic device 1000 is taken as vehicle to explain. Refer to Figure 1The vehicle has a battery pack 1002 installed inside, which can 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 can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. New energy vehicles can 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 movement or the operation of its internal electrical components. However, in some other embodiments, the electronic device 1000 can also be a mobile phone, portable device, laptop, ship, spacecraft, electric toy, and power tool, etc. Spacecraft include airplanes, rockets, space shuttles, and spacecraft, etc.; the working part can obtain electrical energy 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.

[0039] The battery cell, for example, is a prismatic battery. The cell includes: a casing; a cover assembly 150 that covers the casing and defines a receiving cavity within the casing; and an electrode assembly housed within the receiving cavity, the electrode assembly being connected to an adapter plate. The casing includes a bottom wall and side walls surrounding the bottom wall. The receiving cavity houses the electrode assembly, electrolyte, and other necessary battery components. Specifically, the size of the casing can be determined based on the specific size and number of the electrode assembly. The casing can be made of various materials, such as copper, iron, aluminum, steel, or aluminum alloy. To prevent the battery casing from rusting during long-term use, a rust-resistant material such as nickel can be plated onto the surface of the casing.

[0040] Figure 2 An exploded view of a cover plate assembly 150 according to a first embodiment of this application is shown. The cover plate assembly 150 has two pole posts 100 with opposite polarities. Figure 3 A top view of the cover plate assembly 150 according to the first embodiment of this application and a cross-sectional view taken along line AA of the top view are shown. Figure 4 It shows Figure 3 An enlarged view of region B in the cross-sectional diagram. Figure 5 A perspective view of the pole post 100 according to the first embodiment of this application is shown. Figure 6A top view of the pole 100 according to the first embodiment of the application and a sectional view taken along the CC line of the top view are shown, Figure 7 A perspective view of the plugging member 50 according to the first embodiment of the application is shown, Figure 8 A top view of the plugging member 50 according to the first embodiment of the application and a sectional view taken along the DD line of the top view are shown.

[0041] Referring to Figure 4 , the pole 100 comprises a first pole part 10 (material, for example, aluminum) away from the electrode assembly and a second pole part 20 (material, for example, copper) close to the electrode assembly, the first pole part 10 comprises a through hole 30, and the second pole part 20 comprises a blind hole 40 through the through hole 30. The plugging member 50 is at least partially arranged in the blind hole 40 and used to plug the blind hole 40 to plug the leakage route of the electrolyte, so as not to cause corrosion due to the leaked electrolyte, thereby improving the safety of the battery cell.

[0042] The end of the blind hole 40 facing the electrode assembly is closed to form a closed end 44, the closed end 44 is welded with the adapter sheet, the end of the blind hole 40 away from the electrode assembly is not closed and is through the through hole 30, and the plugging member 50 blocks the connecting passage between the joint surface 12 between the first pole part 10 and the second pole part 20 and the closed end 44. Therefore, the electrolyte cannot reach the joint surface 12 from the blind hole 40, and the joint surface 12 is not corroded.

[0043] The plugging member 50 is contained in at least part of the hole section of the blind hole 40 and welded at the connecting surface with the hole section, and the plugging member 50 is not limited to Figure 4 the shape shown, and the plugging member 50 can also be cylindrical, as long as the plugging member 50 and the second pole part 20 can be welded on the entire circumference to achieve the plugging of the blind hole 40. In Figure 4 the embodiment shown, the blind hole 40 has a counterbore 42 below the joint surface 12 on the side facing the through hole 30, the edge part 52 of the plugging member 50 is placed on the counterbore 42 to constitute a cap for plugging the blind hole 40, and the edge part 52 is welded with the second pole part 20 at the counterbore 42. The arrangement of the counterbore 42 and the edge part 52 can facilitate the cooperation of the plugging member 50 and the blind hole 40, and the counterbore 42 and the edge part 52 can be embedded with each other to achieve the accurate alignment of the plugging member 50 and the blind hole 40. The plugging member 50 can only plug part of the hole section of the blind hole 40, for example, Figure 4 as shown in the direction from the through hole 30 to the blind hole 40, the plugging member 50 is separated from the closed end 44 of the blind hole 40, so that the material of the plugging member 50 can be saved, the weight of the battery cell can be reduced, and the height of the plugging member 50 can not be high in manufacturing precision.

[0044] The cover plate body 60 has a through cover plate hole 62, the electrode post 100 passes through the cover plate hole 62, and the sealing ring 70 is disposed between the cover plate body 60 and the electrode post 100 to seal the connection between the cover plate body 60 and the electrode post 100. The sealing ring 70 surrounds and seals the mating surface 12 to prevent the electrode liquid from seeping from around the electrode post 100 to the mating surface 12 and causing corrosion to the mating surface 12. The first electrode post portion 10 includes a first columnar portion 14 and a first flange 16. The second electrode post portion 20 has a second columnar portion 24 and a second flange 26. The first columnar portion 14 and the second columnar portion 24 pass through the cover plate through hole 62. The first flange 16 and the second flange 26 clamp the cover plate body 60 and the sealing ring 70. In the direction from the second electrode post portion 20 to the first electrode post portion 10, the contact surface 72 between the sealing ring 70 and the second flange 26 is lower than the mating surface 12. At the same time, the electrolyte is sealed between the second flange 26 and the cover plate body 60, further preventing the possibility of the electrode liquid reaching the mating surface 12.

[0045] Figure 9 An exploded view of the cover plate assembly 150 according to a second embodiment of this application is shown. Figure 10 A top view of a cover plate assembly 150 according to a second embodiment of this application, and a cross-sectional view taken along line EE of the top view are shown. Figure 11 It shows Figure 10 A magnified view of region F of the cross-sectional diagram. Figure 12 A perspective view of the pole post 100 according to the second embodiment of this application is shown. Figure 13 A top view of the pole post 100 according to the second embodiment of this application and a cross-sectional view taken along line GG of the top view are shown. Figure 14 A perspective view of the sealing member 50 according to the second embodiment of this application is shown. Figure 15 A top view and a cross-sectional view taken along line HH of the top view of the sealing member 50 according to the second embodiment of this application are shown. In the second embodiment, the sealing member 50 is an adhesive covering the closed end 44 of the blind hole 40 and at least a portion of the sidewall of the hole segment connected to the closed end 44, obtained by filling the blind hole 40 with adhesive and curing it. The thickness of the sealing member 50 can be greater than that of the blind hole 40. Figure 11 The illustrated embodiment is thinner; for example, the top surface of the sealing element 50 can be lower than the mating surface 12. As long as the bottom of the blind hole 40 can be sealed, electrolyte can be prevented from reaching and corroding the mating surface 12. The top surface of the sealing element 50 is as follows: Figure 11 When the direction of the seal extends upward beyond the joint surface 12, the sealing effect is better.

[0046] The above merely describes preferred embodiments of the present application and is not intended to limit the present application. For those skilled in the art, the present application can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A cover plate assembly for closing a housing in which an electrode assembly connected to a lug is accommodated, characterized in that, The cover plate assembly comprises: a pole post comprising a first pole post part distal to the electrode assembly and a second pole post part proximal to the electrode assembly, the first pole post part comprising a through hole, and the second pole post part comprising a blind hole through the through hole; and a blocking member at least partially arranged in the blind hole and used for blocking the blind hole.

2. The cover plate assembly according to claim 1, wherein a closed end of the blind hole is welded with the adapter plate, and the blocking member blocks a connecting passage between the closed end and a joint surface between the first pole post part and the second pole post part.

3. The cover plate assembly according to claim 1, wherein the blocking member is accommodated in at least a partial hole section of the blind hole, and the blocking member is welded at a connecting surface with the at least a partial hole section.

4. The cover plate assembly according to claim 3, wherein the blind hole has a counterbore on a side facing the through hole, an edge portion of the blocking member is placed on the counterbore, and the edge portion is welded with the second pole post part at the counterbore.

5. The cover plate assembly of claim 4, wherein, In a direction from the through hole to the blind hole, the blocking member is spaced apart from the closed end of the blind hole.

6. The cover plate assembly of claim 2, wherein, Further comprising: a cover plate body having a cover plate through hole through which the pole post is arranged; a sealing ring arranged between the cover plate body and the pole post to seal the cover plate body and the pole post, the sealing ring surrounding and sealing the joint surface.

7. The cover plate assembly according to claim 6, wherein the first pole post part comprises a first columnar portion and a first flange, and the second pole post part comprises a second columnar portion and a second flange, the first columnar portion and the second columnar portion are arranged through the cover plate through hole, and the first flange and the second flange clamp the cover plate body and the sealing ring, in a direction from the second pole post part to the first pole post part, a contact surface of the sealing ring is lower than the joint surface.

8. The cover plate assembly according to claim 2, wherein the blocking member is a glue covering the closed end of the blind hole and a side wall of at least a partial hole section connected with the closed end.

9. An electric cell characterized by Comprising: a shell; the cover plate assembly according to any one of claims 1-8, the cover plate assembly covering the shell and defining a receiving cavity with the shell; an electrode assembly connected with the adapter plate, the electrode assembly being arranged in the receiving cavity.

10. An electronic device, comprising: The battery cell comprising the electrode assembly according to claim 9.

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