Cylindrical battery with power-off and explosion-proof functions

Abstract

The utility model discloses a cylindrical battery with power-off and explosion-proof functions, which comprises a top cover, an explosion-proof membrane is welded at the side end of the top cover in a limiting manner, a sealing ring is connected with the side end of the explosion-proof membrane in a limiting manner, a power-off membrane is welded at the lower end of the explosion-proof membrane, an insulating spacer is arranged at the upper part of the side end of the power-off membrane in a limiting manner, and a sealing ring is connected with the sealing ring in a limiting manner. The anti-explosion diaphragm is provided with an anti-explosion protection nick, the power-off diaphragm is provided with a power-off nick, the power-off diaphragm adopts a boss mode, the diameter of the boss is 10mm, the height of the boss is 0.6 mm, and the diameter of the power-off nick is 9mm under the condition that the power-off nick is concentric with the boss; and the round seepage holes are formed in the power-off diaphragm, so that electrolyte can better permeate. According to the cylindrical battery with the power-off and explosion-proof functions disclosed by the utility model, the purposes of power-off and explosion-proof are realized through the arrangement of the structure.

Description

Technical Field

[0001] The utility model relates to the technical field of cylindrical batteries, in particular to a cylindrical battery with power-off and explosion-proof functions. Background Art

[0002] The packaging of large cylindrical batteries is divided into roller groove sealing and non-roller groove sealing. Most of the roller groove sealing refers to Tesla's design. The negative end of the battery cell is roller groove sealed. The battery can discharge with a large current, but the battery safety only has explosion-proof protection but not power-off protection. In this way, although the battery is opened for deflation and explosion-proof when it fails, the battery still has current passing through it and cannot effectively ensure safety. The other roller groove sealing method retains the battery cover design of the cylindrical small battery, with power-off and explosion-proof functions, but is limited by the welding and sealing methods. The method of leading out the positive ear at the positive end of the battery cell is welded on the battery cover and then packaged. Although this method provides dual protection of power-off and explosion-proof when the battery is in a failed state, the design of the positive ear itself limits the large current discharge performance of the battery. In order to solve the problem of both ensuring that the battery design can discharge with a large current and taking into account the dual protection design of power-off and explosion-proof, the utility model proposes a new large cylindrical battery design method. Utility Model Content

[0003] The utility model aims to provide a cylindrical battery with power-off and explosion-proof functions to solve the problems raised in the above-mentioned background technology.

[0004] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a cylindrical battery with power-off and explosion-proof functions, comprising a top cover, a side end limit of the top cover is welded with an explosion-proof diaphragm, a side end limit of the explosion-proof diaphragm is connected with a sealing ring, a power-off diaphragm is welded at the lower end of the explosion-proof diaphragm, and an insulating gasket is provided at the upper limit of the side end of the power-off diaphragm;

[0005] The explosion-proof membrane is provided with an explosion-proof protection notch, and the power-off membrane is provided with a power-off notch.

[0006] Specifically, the power-off diaphragm adopts a boss form, the boss diameter is 10mm, the boss height is 0.6mm, the power-off notch is on the boss, and its diameter is 9mm in the concentric case; there are liquid seepage holes on the power-off diaphragm to help better penetrate the electrolyte.

[0007] Specifically, the power-off diaphragm and the positive terminal surface of the flattened large cylindrical battery cell are welded, and the insulating gasket is subsequently filled.

[0008] Specifically, the power-off diaphragm is in the form of a flat aluminum sheet with a diameter of 42 mm. When the power-off notch and the flat aluminum sheet are concentric, the diameter is 9 mm. There are liquid seepage holes on the power-off diaphragm to help better penetrate the electrolyte.

[0009] Specifically, the top cover adopts a hollow design in the middle, and reserves a welding area for the power-off diaphragm and the explosion-proof diaphragm in the later stage.

[0010] Specifically, the power-off diaphragm is welded to the positive end surface of the flattened large cylindrical battery cell, a circle of high-temperature tape is wrapped around the positive end of the battery cell, exposing the battery cell height of 4 mm, and the power-off diaphragm is wrapped therein to prevent the power-off diaphragm from contacting the battery shell;

[0011] Under certain conditions, a certain pressure will be generated inside the battery and converted into tension between the explosion-proof diaphragm and the power-off diaphragm. This tension can disconnect the explosion-proof diaphragm and the power-off diaphragm. Furthermore, in order to ensure that the welding points of the explosion-proof diaphragm and the power-off diaphragm can withstand large currents and the disconnection value of the connection is stable when failure occurs, the power-off diaphragm is treated with power-off notches, and the welding areas of the explosion-proof diaphragm and the power-off diaphragm are required to be within the range of the power-off notches.

[0012] The spot welding methods include but are not limited to laser welding, ultrasonic welding, resistance welding and other welding methods;

[0013] 1. Flattened large cylindrical battery cells and battery cover parts (top cover, explosion-proof diaphragm, power-off diaphragm (assembly), sealing ring);

[0014] 2. Weld the power-off diaphragm (assembly) and the positive end of the flattened large cylindrical battery cell, and install the assembly (if any);

[0015] 3. Place the welded large cylindrical battery cell into the steel shell and then roll it;

[0016] 4. Assemble the sealing ring and explosion-proof diaphragm, and put them into the battery shell roller groove behind the roller groove;

[0017] 5. Weld the explosion-proof diaphragm and the power-off diaphragm;

[0018] 6. Place the top cover of the battery cover into the upper end of the explosion-proof diaphragm and weld the two together;

[0019] 7. Battery sealing process.

[0020] or:

[0021] Steps 1-4 are the same as above.

[0022] 5. Place the top cover of the battery cover into the upper end of the explosion-proof diaphragm and weld the two (if there is no top cover, it can be omitted. If there is a top cover, the top cover must be designed to leave space and position for welding with the explosion-proof disk);

[0023] 6. Battery sealing treatment;

[0024] 7. After sealing, weld the explosion-proof diaphragm and the power-off diaphragm.

[0025] Welding points and welding methods can be carried out in a variety of ways and in any combination.

[0026] Experimental process:

[0027] 1. Make 5 batteries of each of the above-mentioned embodiments 1 and 2;

[0028] 4. After testing the battery, record the power-off value and explosion-proof value (note: the power-off value is designed to be 1.0-1.4Map, and the explosion-proof value is designed to be 2.0-2.4Map).

[0029] The experimental data are shown in the following table:

[0030]

[0031] Compared with the prior art, the beneficial effects of the utility model are:

[0032] The solution is to ensure that the battery design can discharge with a large current while also taking into account the dual protection design of power-off and explosion-proof, so as to better and more safely use the battery and prevent the battery from exploding. At the same time, the current output performance is improved and the power-off control can be performed, thereby improving the safety performance of the battery and better popularizing the cylindrical battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 This is a schematic diagram of the main structure of the utility model;

[0034] Figure 2 A three-dimensional diagram of the main body of the utility model;

[0035] Figure 3 It is a structural schematic diagram of the connection and locking structure of the utility model.

[0036] In the figure: 1, top cover; 2, sealing ring; 201, explosion-proof protection notch; 3, explosion-proof diaphragm; 401, power-off diaphragm; 401-1, power-off notch; 402, insulating gasket. DETAILED DESCRIPTION

[0037] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0038] Example 1

[0039] See also Figure 1-3 The utility model provides a technical solution: the battery cover structure is detailed in Figure 1 The power-off diaphragm 401 is provided with a boss, the boss diameter is 10 mm, the boss height is 0.6 mm, the power-off notch 401-1 is on the boss, and its diameter is 9 mm in the case of concentricity; there are liquid seepage holes on the power-off diaphragm 401 to help better penetrate the electrolyte;

[0040] The power-off film 401 is welded to the positive end surface of the flattened large cylindrical battery cell, and the insulating gasket 402 is installed;

[0041] Put the welded large cylindrical battery cell into the steel shell, and then roll groove; assemble the sealing ring 2 and the explosion-proof membrane 3, and put them into the rolling groove of the battery shell after rolling groove; weld the explosion-proof membrane 3 and the power-off membrane 401, and the welding area is within the range of the power-off notch 401-1; put the top cover 1 into the upper end of the explosion-proof membrane 3, and weld the two; and seal the battery.

[0042] Example 2

[0043] Based on Example 1, an improved process is performed;

[0044] The power-off diaphragm 401 is made of a flat aluminum sheet with a diameter of 42 mm. When the power-off notch 401-1 is concentric with the flat aluminum sheet, its diameter is 9 mm. There are liquid permeation holes on the power-off diaphragm 401 to help better penetrate the electrolyte. The battery top cover adopts a hollow design in the middle to reserve a welding area for the later explosion-proof diaphragm 3 and the power-off diaphragm 401.

[0045] The power-off film 401 is welded to the positive end surface of the flattened large cylindrical battery cell, and a circle of high-temperature tape is wrapped around the positive end of the battery cell, exposing the battery cell 4mm in height and wrapping the power-off film therein to prevent the film from contacting the battery shell;

[0046] Put the welded large cylindrical battery cell into the steel shell, and then roll groove; assemble the sealing ring 2 and the explosion-proof membrane 3, and put them into the rolling groove of the battery shell after rolling groove; put the top cover 1 into the upper end of the explosion-proof membrane 3, and weld the two; seal the battery;

[0047] After sealing, the explosion-proof membrane 3 and the power-off membrane 401 are welded, and the welding area is within the power-off notch range.

[0048] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A cylindrical battery with power-off and explosion-proof functions, comprising a top cover (1), characterized in that: The top cover (1) is welded with an explosion-proof diaphragm (3) at the side end limit position, the explosion-proof diaphragm (3) is connected to a sealing ring (2) at the side end limit position, a power-off diaphragm (401) is welded to the lower end of the explosion-proof diaphragm (3), and an insulating gasket (402) is provided at the upper side end limit position of the power-off diaphragm (401); The explosion-proof membrane (3) is provided with an explosion-proof protection notch (201), and the power-off membrane (401) is provided with a power-off notch (401-1).

2. A cylindrical battery with power-off and explosion-proof functions according to claim 1, characterized in that: There are circular holes on the power-off diaphragm to help the electrolyte penetrate better.

3. A cylindrical battery with power-off and explosion-proof functions according to claim 2, characterized in that: The power-off diaphragm (401) is welded to the positive terminal surface of the flattened large cylindrical battery cell, and the insulating gasket (402) is subsequently loaded.

4. A cylindrical battery with power-off and explosion-proof functions according to claim 3, characterized in that: The power-off diaphragm (401) is in the form of a flat aluminum sheet, and the power-off notch (401-1) is concentric with the flat aluminum sheet; and there are liquid-permeable circular holes on the power-off diaphragm (401) to help better permeate the electrolyte.

5. A cylindrical battery with power-off and explosion-proof functions according to claim 4, characterized in that: The top cover (1) adopts a hollow design in the middle, and reserves a welding area for the later power-off diaphragm (401) and the explosion-proof diaphragm (3).

6. A cylindrical battery with power-off and explosion-proof functions according to claim 5, characterized in that: The power-off diaphragm (401) is welded to the positive terminal surface of the flattened large cylindrical battery cell, and a circle of high-temperature adhesive tape is wrapped around the positive terminal of the battery cell, and the power-off diaphragm (401) is wrapped therein to prevent the power-off diaphragm (401) from contacting the battery shell.

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