Cylindrical battery and battery cap

Abstract

The present application discloses a cylindrical battery and a battery cap thereof, wherein the battery cap comprises an electrode end cap and a current collecting plate located inside the electrode end cap, the current collecting plate is provided with an outward-turned flange hole, the outer side of the electrode end cap is provided with an inward-turned groove, the bottom of the groove is provided with a through hole coaxially arranged with the flange hole, a buckle ring is embedded in the groove, the inner hole of the buckle ring is an explosion-proof pressure relief hole coaxially arranged with the through hole, the axial inner side and the axial outer side of the buckle ring are respectively fixedly connected with an explosion-proof film and a plastic blue film that seal and close the explosion-proof pressure relief hole, the flange of the flange hole extends into the through hole and is arranged radially against the hole wall of the through hole. The battery cap of the present application is simple and ingenious in structure, easy to manufacture, low in internal resistance and explosion-proof.

Description

Technical Field

[0001] The present application relates to the field of batteries, and in particular to a cylindrical battery and a battery cap thereof. Background Art

[0002] In the existing battery structure, the electrode cap structure is complex, difficult to manufacture, and has a high cost. In addition, the battery made of the traditional electrode cap has a large internal resistance after being manufactured. Summary of the invention

[0003] The purpose of this application is to address the above problems and to propose a battery cap which has a simple and ingenious structure, is easy to manufacture, has low internal resistance and is explosion-proof, and also to propose a cylindrical battery equipped with such a battery cap.

[0004] The technical solution of this application is:

[0005] A battery cap comprises an electrode end cap and a current collecting plate located on the inner side of the electrode end cap, the current collecting plate is formed with an outward-turned flange hole, the outer side surface of the electrode end cap is formed with an inward-concave groove, the bottom of the groove is provided with a through hole coaxially arranged with the flange hole, a buckle ring is embedded in the groove, the inner hole of the buckle ring is an explosion-proof pressure relief hole coaxially arranged with the through hole, the axial inner side and the axial outer side of the buckle ring are respectively fixedly connected with an explosion-proof membrane and a plastic blue film that seals and closes the explosion-proof pressure relief hole, the flange of the flange hole extends into the through hole and is arranged radially against the hole wall of the through hole.

[0006] Based on the above technical solutions, this application also includes the following preferred solutions:

[0007] The outer edge of the buckle ring is arranged against the side wall of the groove.

[0008] The axial outer end surface of the retaining ring, the axial outer end surface of the plastic blue film and the axial outer end surface of the electrode end cap are arranged flush.

[0009] The flange of the flange hole extends outward from the through hole and is welded and fixed to the buckle ring, so that the electrode end cap is axially clamped between the collector plate and the buckle ring.

[0010] The outer contours of the current collecting plate, the electrode end cover and the buckle ring are all circular, the flange hole is arranged at the center of the current collecting plate, the through hole is arranged at the center of the electrode end cover, and the explosion-proof pressure relief hole is arranged at the center of the buckle ring.

[0011] A first reinforcing convex plate protruding outward is punched at the center of the collecting plate, and the flange hole is arranged in the middle of the first reinforcing convex plate.

[0012] A second reinforcing convex plate protruding inward is punched at the center of the electrode end cover, so that the groove is formed on the outer side of the second reinforcing convex plate, and the outer side surface of the first reinforcing convex plate is arranged against the inner side surface of the second reinforcing convex plate.

[0013] The outer side surface of the first reinforcing protrusion is welded and fixed to the inner side surface of the second reinforcing protrusion.

[0014] The cylindrical battery proposed in this application comprises:

[0015] Cylindrical battery case,

[0016] an inner core contained in the battery shell, and

[0017] A positive electrode cap and a negative electrode cap respectively arranged at two axial ends of the battery shell;

[0018] It is characterized in that the positive electrode cap or the negative electrode cap is the above-mentioned battery cap, and the current collecting plate is welded and fixed to the positive terminal surface or the negative terminal surface of the inner core.

[0019] The positive electrode cap and the negative electrode cap are both the above-mentioned battery caps. The current collecting plate of the positive electrode cap is welded and fixed to the positive terminal surface of the inner core, and the current collecting plate of the negative electrode cap is welded and fixed to the negative terminal surface of the inner core.

[0020] The advantages of this application are:

[0021] 1. The present application respectively opens through holes and flanged holes on the electrode end cap and the current collector plate. Through the plug-in cooperation of the through holes and flanged holes, not only the flow area of ​​the current collector plate and the electrode end cap is increased, thereby reducing the internal resistance of the battery, but also the accurate alignment connection between the current collector plate and the electrode end cap is facilitated. In addition, the present application utilizes the pressure relief and air permeability of the aforementioned through holes and flanged holes, arranges a buckle ring with a pressure relief hole on the outside of the through hole, and an explosion-proof membrane is sealed on the buckle ring, so that the battery cap also has an explosion-proof function, which is very clever.

[0022] 2. The battery equipped with the battery cap of the present application does not need to be provided with a liquid injection hole. Before the buckle is installed, the electrolyte can be injected from the through hole of the electrode end cap and the flange hole of the current collecting plate, which is very convenient.

[0023] 3. A first reinforcing convex plate protruding outward is punched at the center of the current collecting plate, and a second reinforcing convex plate protruding inward is punched at the center of the electrode end cover. The outer side surface of the first reinforcing convex plate and the inner side surface of the second reinforcing convex plate are arranged against each other and welded and fixed, which not only improves the structural strength of the current collecting plate and the electrode end cover themselves, but also further increases the flow area of ​​the current collecting plate and the electrode end cover.

[0024] 4. If the flange of the flange hole is axially extended so that the flange can extend outward from the through hole and be welded and fixed with the buckle ring, the electrode end cover can be axially clamped between the current collecting plate and the buckle ring. In this way, there is no need to weld the current collecting plate and the electrode end cover, nor is there any need to weld the buckle ring and the electrode end cover, which reduces one welding process, improves assembly efficiency and saves costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. The drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0026] Figure 1 This is a schematic diagram of the three-dimensional structure of the battery cap in the embodiment of the present application;

[0027] Figure 2 This is a schematic diagram of the axial cross-sectional structure of the battery cap in the embodiment of the present application;

[0028] Figure 3 This is an exploded view of the battery cap in the embodiment of the present application;

[0029] Among them: 1-electrode end cover, 2-collecting plate, 3-buckle, 4-explosion-proof membrane, 5-plastic blue film, 101-groove, 102-through hole, 103-second reinforcing convex plate, 201-flanged hole, 201a-flanged edge, 202-first reinforcing convex plate, 301-explosion-proof pressure relief hole. DETAILED DESCRIPTION

[0030] The present application is further described in detail below through specific implementations in combination with the accompanying drawings. The present application can be implemented in a variety of different forms and is not limited to the implementation described in this embodiment. The purpose of providing the following specific implementations is to facilitate a clearer and more thorough understanding of the disclosure of the present application, wherein words indicating directions such as up, down, left, and right are only for the position of the structure shown in the corresponding drawings.

[0031] However, those skilled in the art may realize that one or more of the specific details may be omitted, or other methods, components or materials may be used. In some examples, some embodiments are not described or are not described in detail.

[0032] In addition, the technical features and technical solutions described herein may be combined in any suitable manner in one or more embodiments. It is easy for a person skilled in the art to understand that the steps or operation sequence of the methods related to the embodiments provided herein may also be changed. Therefore, any sequence in the drawings and embodiments is only for illustrative purposes and does not imply a requirement to follow a certain sequence unless it is explicitly stated that a certain sequence is required.

[0033] The serial numbers of the components in this document, such as "first", "second", etc., are only used to distinguish the objects described and do not have any order or technical meaning. The "connection" and "coupling" mentioned in this application, unless otherwise specified, include direct and indirect connections (couplings).

[0034] Figures 1 to 3 A preferred embodiment of the battery cap of the present application is shown. Similar to the conventional battery cap, the battery cap also includes an electrode end cap 1 and a current collecting plate 2 located inside the electrode end cap. Unless otherwise specified, the "inside" and "outside" mentioned in the present application refer to the side facing the center of the battery after the battery cap is installed on the battery as the "inside", and the opposite side as the "outside".

[0035] The key improvement of this embodiment is that the current collecting plate 2 is provided with an outward-turned flange hole 201, and the so-called "outward turn" means that the flange of the flange hole is turned outward. The outer side of the electrode end cover 1 is provided with an inward-concave groove 101, and the bottom of the groove 101 is provided with a through hole 102 coaxially arranged with the aforementioned flange hole 201. A buckle ring 3 is embedded in the groove 101, and the inner hole of the buckle ring 3 (the buckle ring is an annular structure, so it must have an inner hole) is an explosion-proof pressure relief hole 301 coaxially arranged with the through hole 102. An explosion-proof membrane 4 is welded and fixed on the axial inner side of the buckle ring 3, and a plastic blue film 5 is pasted on the axial outer side of the buckle ring 3, and the aforementioned explosion-proof membrane 4 and the plastic blue film 5 both seal and close the aforementioned explosion-proof pressure relief hole 301. The flange 201a of the flange hole 201 extends into the through hole 102, and the flange 201a is arranged radially against the hole wall of the through hole 102.

[0036] It is not difficult to understand that the flange of the flange hole 201 on the current collecting plate 2 and the radial abutment arrangement of the hole wall of the through hole 102 on the electrode end cover 1 not only facilitates the assembly and positioning of the current collecting plate 2 and the electrode end cover 1, but also increases the flow area of ​​the current collecting plate 2 and the electrode end cover 1, which is beneficial to reducing the internal resistance of the battery.

[0037] In order to improve the structural integrity of the battery cap, the current collecting plate 2 and the buckle ring 3 are both welded and fixed to the electrode end cap 1 .

[0038] To prevent pollutants or moisture in the environment from penetrating into the battery through the gap between the buckle ring 3 and the side wall of the groove 101, in this embodiment, the outer edge of the buckle ring 3 is tightly placed against the side wall of the groove 101 without leaving a gap therebetween.

[0039] The axial outer end surface of the buckle ring 3, the axial outer end surface of the plastic blue film 5 and the axial outer end surface of the electrode end cap 1 are arranged flush, thereby ensuring the flatness of the end surface of the battery cap.

[0040] The battery cap of this embodiment is used for cylindrical batteries, so the outer contours of the current collecting plate 2, the electrode end cap 1 and the buckle 3 are all circular. The flange hole 201 is provided at the center of the current collecting plate 2, the through hole 102 is provided at the center of the electrode end cap 1, and the explosion-proof pressure relief hole 301 is provided at the center of the buckle 3.

[0041] In order to improve the structural strength of the current collecting plate 2 and the electrode end cap 1, and further increase the flow area of ​​the current collecting plate 2 and the electrode end cap 1, in this embodiment, a first reinforcing convex plate 202 protruding outward is punched at the center of the current collecting plate 2, and the above-mentioned flange hole 201 is specifically arranged in the middle of the first reinforcing convex plate 202. A second reinforcing convex plate 103 protruding inward is punched at the center of the electrode end cap 1, so that the above-mentioned groove 101 is formed on the outside of the second reinforcing convex plate 103. The outer side surface of the above-mentioned first reinforcing convex plate 202 is arranged against the inner side surface of the second reinforcing convex plate 103.

[0042] The welding position of the current collecting plate 2 and the electrode end cover 1 is specifically the abutment between the first reinforcing convex plate 202 and the second reinforcing convex plate 103 , that is, the outer side surface of the first reinforcing convex plate 202 and the inner side surface of the second reinforcing convex plate 103 are welded and fixed.

[0043] Of course, we can axially lengthen the flange 201a of the flange hole 201 so that the flange 102a can extend outward from the through hole 102, and weld the extended portion of the flange 102a to the buckle ring 3, so that the electrode end cap 1 can be axially clamped between the current collecting plate 2 and the buckle ring 3. In this way, there is no need to weld the current collecting plate 2 and the electrode end cap 1, and there is no need to weld the buckle ring 3 and the electrode end cap 1, which reduces one welding process.

[0044] The battery cap of this embodiment can be used as a positive electrode cap of the battery, or as a negative electrode cap of the battery, and is usually configured in a cylindrical lithium-ion battery. For example: a typical cylindrical battery includes a cylindrical battery shell, an inner core contained in the battery shell, and a positive electrode cap and a negative electrode cap respectively arranged at the axial ends of the battery shell. And the aforementioned battery shell can be a cylindrical structure with both ends open, or a cylindrical structure with a bottom that is open at one end and closed at the other end. If the aforementioned positive electrode cap adopts the battery cap structure of this embodiment, then its collector plate 2 needs to be welded and fixed to the positive terminal surface of the inner core. If the aforementioned negative electrode cap adopts the battery cap structure of this embodiment, then its collector plate 2 needs to be welded and fixed to the negative terminal surface of the inner core. When the battery fails and the internal air pressure of the battery shell rises rapidly, the high-pressure gas will break through the explosion-proof membrane 4 and the plastic blue film 5 to release the internal pressure and prevent the battery from exploding. The function of the plastic blue film 5 is to protect the explosion-proof membrane on the inside.

[0045] The above embodiments are only for illustrating the technical concept and features of the present application, and their purpose is to enable people to understand the content of the present application and implement it accordingly, and they cannot be used to limit the protection scope of the present application. Any equivalent transformation or modification made according to the spirit of the main technical solution of the present application shall be included in the protection scope of the present application.

Claims

1. A battery cap, comprising an electrode end cap (1) and a current collecting plate (2) located inside the electrode end cap, characterized in that: The current collecting plate (2) is provided with an outwardly turned flange hole (201), the outer side surface of the electrode end cover (1) is provided with an inwardly turned groove (101), the bottom of the groove (101) is provided with a through hole (102) coaxially arranged with the flange hole (201), a buckle ring (3) is embedded in the groove (101), the inner hole of the buckle ring (3) is an explosion-proof pressure relief hole (301) coaxially arranged with the through hole (102), and the axial inner side and the axial inner side of the buckle ring (3) are provided with a plurality of holes. An explosion-proof membrane (4) and a plastic blue membrane (5) are respectively fixedly connected to the outside to seal the explosion-proof pressure relief hole (301), and the flange (201a) of the flange hole (201) extends into the through hole (102) and is arranged radially against the hole wall of the through hole (102), wherein the explosion-proof membrane (4) is fixedly connected to the axial inner side of the buckle (3) by welding, and the plastic blue membrane (5) is fixedly connected to the axial outer side of the buckle (3) by gluing.

2. The battery cap according to claim 1, characterized in that: The outer edge of the buckle ring (3) is arranged in abutment with the side wall of the groove (101).

3. The battery cap according to claim 1, characterized in that: The axial outer end surface of the buckle ring (3), the axial outer end surface of the plastic blue film (5) and the axial outer end surface of the electrode end cap (1) are arranged flush.

4. The battery cap according to claim 1, characterized in that: The flange (201a) of the flange hole (201) extends outward from the through hole (102) and is welded and fixed to the buckle ring (3), thereby axially clamping the electrode end cover (1) between the current collecting plate (2) and the buckle ring (3).

5. The battery cap according to claim 1, characterized in that: The outer contours of the current collecting disc (2), the electrode end cover (1) and the buckle ring (3) are all circular; the flange hole (201) is arranged at the center of the current collecting disc (2); the through hole (102) is arranged at the center of the electrode end cover (1); and the explosion-proof pressure relief hole (301) is arranged at the center of the buckle ring (3).

6. The battery cap according to claim 5, characterized in that: A first reinforcing convex plate (202) protruding outward is punched at the center of the current collecting plate (2), and the flange hole (201) is arranged in the middle of the first reinforcing convex plate (202).

7. The battery cap according to claim 6, characterized in that: A second reinforcing convex plate (103) protruding inward is punched at the center of the electrode end cover (1), so that the groove (101) is formed on the outer side of the second reinforcing convex plate (103), and the outer side surface of the first reinforcing convex plate (202) is arranged in abutment with the inner side surface of the second reinforcing convex plate (103).

8. The battery cap according to claim 7, characterized in that: The outer side surface of the first reinforcing convex plate (202) and the inner side surface of the second reinforcing convex plate (103) are welded and fixed.

9. A cylindrical battery comprising: Cylindrical battery case, an inner core contained in the battery shell, and A positive electrode cap and a negative electrode cap respectively arranged at two axial ends of the battery shell; It is characterized in that the positive electrode cap or the negative electrode cap is a battery cap as described in any one of claims 1 to 8, and the current collecting plate (2) is welded and fixed to the positive terminal surface or the negative terminal surface of the inner core.

10. The cylindrical battery according to claim 9, characterized in that: The positive electrode cap and the negative electrode cap are both battery caps as described in any one of claims 1 to 8, the current collecting plate (2) of the positive electrode cap is welded and fixed to the positive terminal surface of the inner core, and the current collecting plate (2) of the negative electrode cap is welded and fixed to the negative terminal surface of the inner core.

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