Cylindrical battery

Abstract

The application provides a cylindrical battery, which comprises a top cover, an insulating sleeve, a positive current collector and a bare battery core. The insulating sleeve comprises a top plate, and the top cover is in abutment with the top plate. The bottom surface of the top plate is in abutment with the top surface of the positive current collector. The insulating sleeve is sleeved on the bare battery core, and the bottom surface of the positive current collector is in abutment with the top surface of the bare battery core. The application solves the problem that the positive current collector is not sufficiently compressed to the electrode assembly in the existing cylindrical battery.

Description

Technical Field

[0001] This application relates to the technical field of batteries, and in particular to a cylindrical battery. Background Technology

[0002] Cylindrical batteries are a type of battery characterized by high capacity, long cycle life, and a wide operating temperature range. Existing cylindrical batteries include a cover plate, a positive current collector, a lower plastic layer, a negative current collector, insulating components, and electrode assemblies. The positive current collector is located between the electrode assemblies and the cover plate. The insulating components provide insulation and isolation between the positive and negative current collectors.

[0003] The outer portion of the positive current collector and the cover plate are alternately positioned by the lower plastic layer, meaning the electrode assembly, the outer portion of the positive current collector, the lower plastic layer, and the cover plate abut against each other in sequence. Because only a portion of the positive current collector is pressed down by the lower plastic layer, leaving the remaining portion unpressed, the area of ​​the positive current collector pressed down by the lower plastic layer is small, preventing it from being sufficiently compressed against the electrode assembly. Therefore, existing cylindrical batteries suffer from the problem of the positive current collector not being adequately compressed against the electrode assembly. Utility Model Content

[0004] The purpose of this application is to provide a cylindrical battery in which the positive current collector can be more fully compressed to the bare cell, comprising a top cover, an insulating sleeve, a positive current collector, and a bare cell. The insulating sleeve includes a top plate, and the top cover abuts against the top plate. The bottom surface of the top plate abuts against the top surface of the positive current collector. The insulating sleeve is fitted onto the bare cell, and the bottom surface of the positive current collector abuts against the top surface of the bare cell.

[0005] Optionally, the insulating sleeve further includes a first limiting groove, in which the positive current collector is engaged.

[0006] Optionally, the side of the positive current collector abuts against the inner side of the first limiting groove, and the cross-section of the first limiting groove is larger than the cross-section of the positive current collector.

[0007] Optionally, the cylindrical battery further includes a positive electrode post, the first limiting groove includes a first through hole, the positive electrode post is engaged in the first through hole, and the positive electrode post is connected to the top cover.

[0008] Optionally, the positive current collector includes a liquid injection hole, and the positive electrode post is connected to the liquid injection hole.

[0009] Optionally, the cylindrical battery further includes a casing, and the insulating sleeve further includes a side plate, which is connected to the top plate and is sandwiched between the casing and the bare cell.

[0010] Optionally, the cylindrical battery further includes a negative electrode current collector, the top cover abuts against the negative electrode current collector, and the top plate, the negative electrode current collector, and the bare cell abut against each other in sequence.

[0011] Optionally, the insulating sleeve further includes a second limiting groove, in which the negative electrode current collector is engaged.

[0012] Optionally, the second limiting groove includes a second through hole, and the top cover includes a recessed portion, which is embedded in the second through hole and abuts against the negative electrode current collector.

[0013] Optionally, the insulating sleeve includes a blocking rib and a first limiting groove, the positive current collector is engaged in the first limiting groove, and the first limiting groove and the second limiting groove share the blocking rib.

[0014] The beneficial effects of this application are as follows: by setting a top cover, an insulating sleeve, a positive current collector, and a bare cell. The insulating sleeve includes a top plate, and the top cover abuts against the top plate. The bottom surface of the top plate abuts against the top surface of the positive current collector. The insulating sleeve is fitted onto the bare cell, and the bottom surface of the positive current collector abuts against the top surface of the bare cell.

[0015] Since the bottom surface of the top plate abuts against the top surface of the positive current collector, and the bottom surface of the positive current collector abuts against the top surface of the bare cell, the top plate, the positive current collector, and the bare cell are all in contact with each other in a sequential manner through surface contact. This increases the area where the positive current collector is pressed, which in turn allows the positive current collector to be pressed more fully onto the bare cell.

[0016] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, the following describes the application in detail with reference to the preferred embodiments and accompanying drawings. Attached Figure Description

[0017] Figure 1 This is an exploded view of a cylindrical battery according to one embodiment of this application;

[0018] Figure 2 This is a half-sectional view of a cylindrical battery in one embodiment of this application (the cutting plane passes through the midpoint of the central axis of the bare cell and the arc segment of the recess).

[0019] Figure 3 In one embodiment of this application, Figure 2 A magnified view from direction A;

[0020] Figure 4 This is an exploded view of the insulating sleeve, the positive current collector, and the negative current collector in one embodiment of this application (the blocking rib is disposed on the insulating sleeve);

[0021] Figure 5In one embodiment of this application, Figure 2 A magnified view from direction B;

[0022] Figure 6 In one embodiment of this application, Figure 2 C-axis magnified view;

[0023] Figure 7 This is a bottom view of a positive current collector and a negative current collector assembled onto an insulating sleeve in one embodiment of this application (with blocking ribs disposed on the insulating sleeve);

[0024] Figure 8 This is a bottom view of the insulating sleeve and the blocking rib in one embodiment of this application.

[0025] In the attached figures, the following labels are used:

[0026] 100 top cover

[0027] 1000 Depression

[0028] 101 Insulating sleeve

[0029] 1010 Top Plate

[0030] 1011 First limiting groove

[0031] 10110 First Through Hole

[0032] 1012 Side Panel

[0033] 1013 Second limiting groove

[0034] 10130 Second Through Hole

[0035] 102 Positive current collector

[0036] 1020 Injection Hole

[0037] 103 Bare Battery Cells

[0038] 1030 center hole

[0039] 104 Positive terminal

[0040] 1040 Protrusion

[0041] 10400 liquid passage

[0042] 105 Sealing Cap

[0043] 106 Outer shell

[0044] 107 Negative current collector

[0045] 108 Intercepting reinforcement Detailed Implementation

[0046] The following specific embodiments illustrate the implementation of this application. Those skilled in the art can easily understand other advantages and effects of this application from the content disclosed in this specification.

[0047] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present application will now be described in detail with reference to the accompanying drawings and embodiments. To enable those skilled in the art to better understand the solutions of this application, the technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of this application.

[0048] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover a non-exclusive inclusion; for example, a process, method, system, product, or device that includes a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to these processes, methods, products, or devices.

[0049] It should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0050] Please also refer to Figures 1 to 3 This embodiment provides a cylindrical battery, including a top cover 100, an insulating sleeve 101, a positive current collector 102, and a bare cell 103. The insulating sleeve 101 includes a top plate 1010, and the top cover 100 abuts against the top plate 1010. The bottom surface of the top plate 1010 abuts against the top surface of the positive current collector 102. The insulating sleeve 101 is fitted onto the bare cell 103, and the bottom surface of the positive current collector 102 abuts against the top surface of the bare cell 103.

[0051] Please also refer to Figures 1 to 3Since the bottom surface of the top plate 1010 abuts against the top surface of the positive current collector 102, and the bottom surface of the positive current collector 102 abuts against the top surface of the bare cell 103, the top plate 1010, the positive current collector 102, and the bare cell 103 are all in contact with each other in a sequential manner through surface contact, which increases the area where the positive current collector 102 is pressed, thereby allowing the positive current collector 102 to be pressed more fully onto the bare cell 103.

[0052] Please also refer to Figure 1 and Figure 3 The top cover 100 is roughly disc-shaped. The top plate 1010 is semi-disc-shaped. The bottom surface of the top cover 100 abuts against the top surface of the insulating sleeve 101. The top cover 100 can be made of plastic. The insulating sleeve 101 can be made of rubber. The top plate 1010 is located below the top cover 100. The positive current collector 102 is fan-shaped and can be made of aluminum. The positive current collector 102 is located below the top plate 1010. The bare cell 103 is formed by stacking and rolling positive and negative electrode sheets and a separator in a specific order.

[0053] Please also refer to Figure 1 and Figure 3 The bare cell 103 is cylindrical in shape. It is located below the positive current collector 102. The bare cell 103 and the positive current collector 102 are connected. The bare cell 103 and the positive current collector 102 can be connected by soldering (soldering can be tin soldering, the same below).

[0054] like Figure 4 As shown, optional, insulating sleeve 101 (please refer to insulating sleeve 101). Figure 1 (The same applies below) It also includes a first limiting groove 1011, in which the positive current collector 102 is engaged. This arrangement facilitates alignment when the positive current collector 102 is installed onto the insulating sleeve 101. The first limiting groove 1011 is fan-shaped. The thickness of the positive current collector 102 is the same as the depth of the first limiting groove 1011.

[0055] Please also refer to Figure 3 and Figure 4 Optionally, the side of the positive current collector 102 abuts against the inner side of the first limiting groove 1011, and the cross-section of the first limiting groove 1011 is larger than the cross-section of the positive current collector 102. This arrangement facilitates the insertion of the positive current collector 102 into the first limiting groove 1011. For example, as... Figure 4 As shown, the left and right sides of the positive current collector 102 abut against the left and right inner sides of the first limiting groove 1011, respectively. The top side of the positive current collector 102 abuts against the top arc inner side of the first limiting groove 1011. The bottom arc side of the positive current collector 102 and the bottom arc inner side of the first limiting groove 1011 are alternately arranged.

[0056] Please also refer to Figure 3 and Figure 4 Optionally, the cylindrical battery also includes a positive terminal 104. The first limiting groove 1011 includes a first through hole 10110, and the positive terminal 104 is engaged in the first through hole 10110. The positive terminal 104 is connected to the top cover 100. This configuration allows for easy connection of the positive terminal 104 and the insulating sleeve 101 (please refer to [reference needed] for insulating sleeve 101). Figure 1 The first through hole 10110 and the top cover 100 are connected as one piece. The first through hole 10110 can be set at the top of the first limiting groove 1011. The first through hole 10110 can be a round hole.

[0057] Please also refer to Figure 4 and Figure 5 The positive terminal 104 may include a cylindrical protrusion 1040, the outer diameter of which is the same as the diameter of the first through hole 10110, and the protrusion 1040 is engaged with the first through hole 10110. The positive terminal 104 and the top cover 100 (see top cover 100 for reference) Figure 3 (The same applies below) can be connected by snap-fit ​​or adhesive bonding. The positive terminal 104 and the top cover 100 can be coaxially arranged. The positive terminal 104 abuts against the top surface of the positive current collector 102 and is connected to the positive current collector 102. The positive terminal 104 can be connected to the positive current collector 102 by welding. The material of the positive terminal 104 can be aluminum alloy.

[0058] Please also refer to Figure 4 and Figure 5 Optionally, the positive current collector 102 includes an injection hole 1020, and the positive electrode post 104 is connected to the injection hole 1020. The connection between the positive electrode post 104 and the injection hole 1020 facilitates the injection of electrolyte into the bare cell 103. The injection hole 1020 can be located at the top of the positive current collector 102. The center of the protrusion 1040 may include a through hole 10400. The bare cell 103 includes a central hole 1030. The first through hole 10110, the through hole 10400, the injection hole 1020, and the central hole 1030 can be coaxially arranged. The through hole 10400, the injection hole 1020, and the central hole 1030 can be connected. Electrolyte can be injected into the central hole 1030 through the through hole 10400 and the injection hole 1020. The injection hole 1020 can be sealed with a sealing cap 105.

[0059] like Figure 3 As shown, optionally, the cylindrical battery also includes a housing 106 and an insulating sleeve 101 (please refer to the documentation for the insulating sleeve 101). Figure 1It also includes a side plate 1012, which is connected to the top plate 1010. The side plate 1012 is sandwiched between the outer casing 106 and the bare cell 103. This arrangement allows the bare cell 103 to be separated by the side plate 1012, enabling electrons within the bare cell 103 to flow at the top of the outer casing 106, effectively reducing the electron transport path and thus lowering the internal resistance of the cylindrical battery during output.

[0060] like Figure 3 As shown, the side plate 1012 can be cylindrical. The top of the side plate 1012 and the bottom edge of the top plate 1010 can be connected by integral molding. The outer shell 106 can be a steel shell. The height of the side plate 1012 is less than the height of the outer shell 106. The inner side of the side plate 1012 and the side of the positive current collector 102 are spaced apart.

[0061] Please also refer to Figure 4 and Figure 6 Optionally, the cylindrical battery also includes a negative current collector 107, with a top cover 100 abutting against the negative current collector 107, and a top plate 1010, the negative current collector 107, and the bare cell 103 abutting against it in sequence. The top cover 100 abutting against the negative current collector 107 allows it to directly press the negative current collector 107 against the top surface of the bare cell 103, eliminating the need for additional plastic to fix the negative current collector 107, thus simplifying the fixing structure of the negative current collector 107.

[0062] Please also refer to Figure 4 and Figure 6 The negative current collector 107 can be crescent-shaped. The material of the negative current collector 107 can be copper. The negative current collector 107 is located below the top plate 1010. The negative current collector 107 is located above the bare cell 103. The negative current collector 107 and the positive current collector 102 are spaced apart. The side of the negative current collector 107 and the inner side of the side plate 1012 are spaced apart. The negative current collector 107 is connected to the bare cell 103. The negative current collector 107 can be connected to the bare cell 103 by welding.

[0063] Please also refer to Figure 4 and Figure 7 Optional, insulating sleeve 101 (please refer to insulating sleeve 101) Figure 1 (The same applies below) It also includes a second limiting groove 1013, in which the negative current collector 107 is engaged. This arrangement facilitates alignment when the negative current collector 107 is installed onto the insulating sleeve 101. The second limiting groove 1013 may be crescent-shaped. The cross-section of the second limiting groove 1013 is larger than the cross-section of the negative current collector 107. The depth of the second limiting groove 1013 is the same as the thickness of the negative current collector 107. The bottom surface of the negative current collector 107 may be coplanar with the bottom surface of the positive current collector 102.

[0064] Please also refer to Figure 4 and Figure 6 Optionally, the second limiting groove 1013 includes a second through hole 10130, and the top cover 100 includes a recess 1000, which is embedded in the second through hole 10130 and abuts against the negative electrode current collector 107. This arrangement facilitates the top cover 100 abutting against the negative electrode current collector 107 and also facilitates the welding of the negative electrode current collector 107 and the outer shell 106 through the second through hole 10130.

[0065] Please also refer to Figure 4 and Figure 6 The second through hole 10130 can be crescent-shaped. The cross-sectional area of ​​the second through hole 10130 is smaller than the cross-sectional area of ​​the second limiting groove 1013. The cross-sectional area of ​​the second through hole 10130 is smaller than the cross-sectional area of ​​the negative electrode current collector 107. The recess 1000 can be fan-shaped and formed by downward indentation. The bottom surface of the recess 1000 can abut against the top surface of the negative electrode current collector 107. The cross-section of the recess 1000 is smaller than the cross-section of the second through hole 10130.

[0066] Please also refer to Figure 4 and Figure 8 Optional, insulating sleeve 101 (please refer to insulating sleeve 101) Figure 1 (The same applies below) includes a blocking rib 108 and a first limiting groove 1011. The positive current collector 102 is engaged in the first limiting groove 1011. The first limiting groove 1011 and the second limiting groove 1013 share the blocking rib 108. The first limiting groove 1011 and the second limiting groove 1013 share the blocking rib 108, which not only isolates the positive current collector 102 and the negative current collector 107, but also allows the blocking rib 108 to assist in the installation of the positive current collector 102 and the negative current collector 107, simplifying the installation structure of the positive current collector 102 and the negative current collector 107.

[0067] Please also refer to Figure 4 , Figure 6 and Figure 7 The inner surface of the blocking rib 108 abuts against the side of the positive current collector 102. The outer surface of the blocking rib 108 abuts against the side of the negative current collector 107. The blocking rib 108 can be inverted U-shaped. The blocking rib 108 can be disposed on the bottom surface of the top plate 1010. Both ends of the blocking rib 108 are respectively connected to the side plate 1012. The blocking rib 108, the top plate 1010, and the side plate 1012 can be connected by integral molding.

[0068] Please also refer to Figure 4 , Figure 6 and Figure 8The first limiting groove 1011 can be formed by the blocking rib 108, the top plate 1010, and the side plate 1012. The second limiting groove 1013 can be formed by the blocking rib 108, the top plate 1010, and the side plate 1012. The blocking rib 108 divides the bottom surface of the top plate 1010 into two parts, so that a portion of the bottom surface of the top plate 1010 is used to form the bottom surface of the first limiting groove 1011, and the remaining portion of the bottom surface of the top plate 1010 is used to form the bottom surface of the second limiting groove 1013.

[0069] Please also refer to Figure 3 , Figure 4 and Figure 6 During assembly, first place the positive current collector 102 and the negative current collector 107 on top of the bare cell 103. Then solder the positive current collector 102 to the bare cell 103. After the negative current collector 107 is properly positioned, use the insulating sleeve 101 (please refer to the insulating sleeve 101 for details). Figure 1 Press down to allow the positive current collector 102 to be inserted into the first limiting groove 1011, and the negative current collector 107 to be inserted into the second limiting groove 1013, and then weld the negative current collector 107 to the bare cell 103.

[0070] After the positive current collector 102 and the bare cell 103 are welded together, and the negative current collector 107 and the bare cell 103 are welded together, the positive terminal post 104 and the positive current collector 102 are then welded together. The outer casing 106 and the negative current collector 107 are then welded together through the second through hole 10130.

[0071] The cylindrical battery provided in the embodiments of this application has been described in detail above. For those skilled in the art, based on the ideas of the embodiments of this application, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be construed as a limitation of this application. All equivalent modifications or changes made in accordance with the spirit and technical concept of this application should still be covered by the claims of this application.

Claims

1. A cylindrical battery, characterized in that, include: Top cover; An insulating sleeve, comprising a top plate, wherein the top cover abuts against the top plate; Positive current collector, the bottom surface of the top plate abuts against the top surface of the positive current collector; as well as The bare battery cell has an insulating sleeve fitted onto it, and the bottom surface of the positive current collector abuts against the top surface of the bare battery cell.

2. The cylindrical battery according to claim 1, characterized in that, The insulating sleeve also includes a first limiting groove, and the positive current collector is engaged in the first limiting groove.

3. The cylindrical battery according to claim 2, characterized in that, The side of the positive current collector abuts against the inner side of the first limiting groove, and the cross-section of the first limiting groove is larger than the cross-section of the positive current collector.

4. The cylindrical battery according to claim 2, characterized in that, It also includes a positive electrode post, the first limiting groove includes a first through hole, the positive electrode post is engaged in the first through hole, and the positive electrode post is connected to the top cover.

5. The cylindrical battery according to claim 4, characterized in that, The positive electrode current collector includes a liquid injection hole, and the positive electrode post is connected to the liquid injection hole.

6. The cylindrical battery according to claim 1, characterized in that, It also includes an outer casing, and the insulating sleeve further includes a side plate connected to the top plate, the side plate being sandwiched between the outer casing and the bare battery cell.

7. The cylindrical battery according to claim 1, characterized in that, It also includes a negative current collector, with the top cover abutting against the negative current collector, and the top plate, the negative current collector, and the bare battery cell abutting against it in sequence.

8. The cylindrical battery according to claim 7, characterized in that, The insulating sleeve also includes a second limiting groove, and the negative electrode current collector is engaged in the second limiting groove.

9. The cylindrical battery according to claim 8, characterized in that, The second limiting groove includes a second through hole, and the top cover includes a recessed portion, which is embedded in the second through hole and abuts against the negative electrode collector.

10. The cylindrical battery according to claim 8, characterized in that, The insulating sleeve includes a blocking rib and a first limiting groove. The positive current collector is engaged in the first limiting groove, and the first limiting groove and the second limiting groove share the blocking rib.

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