Cap assembly of battery and lithium battery

Abstract

The utility model belongs to the technical field of batteries, and particularly relates to a cap assembly of a battery and a lithium battery, the cap assembly comprises a cap assembly body, the cap assembly body comprises an electric connection assembly and a sealing sleeve arranged on the outer side of the electric connection assembly, the electric connection assembly comprises a pore plate, an explosion-proof plate, a PTC (Positive Temperature Coefficient) and an upper cap which are electrically connected in sequence, the hole plate, the anti-explosion plate, the PTC and the upper cap are sequentially arranged in the sealing sleeve from bottom to top, and the upper cap, the PTC and the anti-explosion plate are detachably connected into the sealing sleeve through connecting assemblies so that the upper cap, the PTC and the anti-explosion plate can be prevented from loosening. According to the utility model, the upper cap, the PTC and the explosion-proof plate are fixed in the sealing sleeve by arranging the connecting assembly, so that not only can the upper cap, the PTC and the explosion-proof plate be disassembled, but also the upper cap, the PTC and the explosion-proof plate can be prevented from loosening.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a battery cap assembly and a lithium battery. Background Art

[0002] A battery refers to a cup, trough or other container or part of a composite container that contains an electrolyte solution and a metal electrode to generate an electric current. It is a device that can convert chemical energy into electrical energy. It has a positive electrode and a negative electrode. With the advancement of science and technology, batteries generally refer to small devices that can generate electrical energy. Such as solar cells. The performance parameters of batteries mainly include electromotive force, capacity, specific energy and resistance. Using batteries as an energy source can obtain a current with stable voltage, stable current, long-term stable power supply, and little external influence. The battery has a simple structure, is easy to carry, and is easy to charge and discharge. It is not affected by external climate and temperature. The performance is stable and reliable, and it plays a great role in all aspects of modern social life. Lithium batteries are one type of batteries.

[0003] Existing lithium batteries are mainly composed of a shell and a cap assembly installed at one end of the shell. However, during the use of lithium batteries, mechanical vibrations, collisions, drops, etc. are usually involved, which will cause poor contact between the upper cap, explosion-proof plate and PTC in the cap assembly. If the contact is poor, the contact internal resistance between the upper cap, explosion-proof plate and PTC will drift or increase, eventually leading to large self-discharge of the battery, severe heat generation during use, and even worse, causing internal short circuit or fire in the battery, causing major safety accidents. Therefore, a battery cap assembly and a lithium battery are invented. Utility Model Content

[0004] In view of the above and / or existing problems in a battery cap assembly and a lithium battery, the present utility model is proposed.

[0005] Therefore, the purpose of the present invention is to provide a battery cap assembly and a lithium battery, which can solve the above-mentioned existing problems.

[0006] In order to solve the above technical problems, according to one aspect of the present invention, the present invention provides the following technical solutions:

[0007] A cap assembly of a battery comprises a cap assembly body, the cap assembly body comprises an electrical connection assembly and a sealing sleeve arranged outside the electrical connection assembly, the electrical connection assembly comprises an orifice plate, an explosion-proof plate, a PTC and an upper cap which are electrically connected in sequence, the orifice plate, the explosion-proof plate, the PTC and the upper cap are arranged in the sealing sleeve in sequence from bottom to top, and the upper cap, the PTC and the explosion-proof plate are detachably connected in the sealing sleeve through a connection assembly to prevent the upper cap, the PTC and the explosion-proof plate from loosening.

[0008] As a preferred solution of the battery cap assembly described in the utility model, an insulating ring is provided between the upper cap and the explosion-proof plate to prevent electrical contact between the upper cap and the explosion-proof plate.

[0009] As a preferred solution of a battery cap assembly described in the utility model, wherein: a hole plate is fixedly mounted on the bottom of the explosion-proof plate, and a hole plate gasket is provided between the hole plate and the explosion-proof plate.

[0010] As a preferred solution of the battery cap assembly described in the utility model, wherein: the upper cap is provided with a first through hole, the PTC is provided with a second through hole, and the explosion-proof plate is provided with a third through hole.

[0011] As a preferred solution of the battery cap assembly described in the utility model, wherein: the first through hole and the second through hole are aligned with each other, and the second through hole and the third through hole are aligned with each other.

[0012] As a preferred solution of a battery cap assembly according to the utility model, the connecting assembly comprises:

[0013] A first stud, wherein the first stud is fixedly mounted in the inner cavity of the sealing sleeve, and an end of the first stud passes through the first through hole, the second through hole, and the third through hole in sequence;

[0014] A second stud, wherein the second stud is fixedly mounted on an end of the first stud, and the thread directions of the first stud and the second stud are arranged to be opposite;

[0015] a first nut, the first nut being threadedly connected to the first stud;

[0016] A second nut is threadedly connected to the second stud.

[0017] As a preferred solution of a battery cap assembly described in the utility model, the diameter of the first stud is greater than the diameter of the second stud, and the diameter of the first stud is the same as the diameters of the first through hole, the second through hole and the third through hole.

[0018] A lithium battery comprises a shell, a cap assembly body, and a battery core and an electrolyte located in a cavity surrounded by the shell and the cap assembly body. The cap assembly body adopts the above-mentioned cap assembly body.

[0019] Compared with existing technologies:

[0020] By setting a connecting component to fix the upper cap, PTC and explosion-proof plate in the sealing sleeve, not only can the upper cap, PTC and explosion-proof plate be disassembled and assembled, but also the upper cap, PTC and explosion-proof plate can be prevented from loosening. By disassembling and assembling the upper cap, PTC and explosion-proof plate, it is possible to disassemble and assemble the upper cap or PTC or explosion-proof plate on the battery that does not meet the requirements after processing the battery, thereby avoiding waste. By preventing the upper cap, PTC and explosion-proof plate from loosening, it is possible to avoid poor contact between the upper cap, PTC and explosion-proof plate, thereby improving the safety of battery use. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic cross-sectional view of the cap assembly body of the utility model;

[0022] Figure 2 For this utility model Figure 1 A schematic diagram of the structure enlargement in the middle;

[0023] Figure 3 This is a schematic diagram of the structure of the first stud and the second stud of the utility model;

[0024] Figure 4 This is a schematic diagram of the structure of a lithium battery of the utility model.

[0025] In the figure: the cap assembly body 100, the shell 200, the battery cell 300, the upper cap 10, the first through hole 11, the PTC 20, the second through hole 21, the explosion-proof plate 30, the third through hole 31, the orifice plate gasket 40, the orifice plate 50, the sealing sleeve 60, the first stud 71, the second stud 72, the first nut 73, and the second nut 74. DETAILED DESCRIPTION

[0026] In order to make the purpose, technical solution and advantages of the present invention more clear, the implementation mode of the present invention will be further described in detail below with reference to the accompanying drawings.

[0027] The utility model provides a battery cap assembly, please refer to Figure 1-Figure 4, including a cap assembly body 100, the cap assembly body 100 includes an electrical connection assembly and a sealing sleeve 60 arranged outside the electrical connection assembly, the electrical connection assembly includes an orifice plate 50, an explosion-proof plate 30, a PTC20 and an upper cap 10 which are electrically connected in sequence, the orifice plate 50, the explosion-proof plate 30, the PTC20 and the upper cap 10 are arranged in the sealing sleeve 60 from bottom to top, the upper cap 10, the PTC20 and the explosion-proof plate 30 are detachably connected in the sealing sleeve 60 through the connection assembly, so as to avoid the upper cap 10, the PTC20 and the explosion-proof plate 30 from loosening, the upper cap An insulating ring is provided between the upper cap 10 and the explosion-proof plate 30 to prevent electrical contact between the upper cap 10 and the explosion-proof plate 30. The bottom of the explosion-proof plate 30 is fixedly mounted with a hole plate 50, and a hole plate gasket 40 is provided between the hole plate 50 and the explosion-proof plate 30. A first through hole 11 is provided on the upper cap 10, a second through hole 21 is provided on the PTC 20, and a third through hole 31 is provided on the explosion-proof plate 30. The first through hole 11 and the second through hole 21 are aligned, and the second through hole 21 and the third through hole 31 are aligned, and the diameters of the first through hole 11, the second through hole 21 and the third through hole 31 are the same.

[0028] The connecting assembly includes: a first stud 71, a second stud 72, a first nut 73, and a second nut 74;

[0029] The first stud 71 is fixedly installed in the inner cavity of the sealing sleeve 60. The first stud 71 is made of insulating material, including but not limited to plastic, and the end of the first stud 71 passes through the first through hole 11, the second through hole 21 and the third through hole 31 in sequence. The second stud 72 is fixedly installed on the end of the first stud 71. The second stud 72 is made of insulating material, including but not limited to plastic, and the thread directions of the first stud 71 and the second stud 72 are set to be opposite, so that the tightening directions of the first nut 73 and the second nut 74 are opposite. The first nut 73 is threadedly connected to the first stud 71. The first nut 73 is made of insulating material, including but not limited to plastic, and the first nut 73 and the upper cap 10 are in close contact. The second nut 74 is threadedly connected to the second stud 72. The second nut 74 is made of insulating material, including but not limited to plastic, and the first nut 73 and the second nut 74 are in close contact. The diameter of the first stud 71 is greater than the diameter of the second stud 72, and the diameter of the first stud 71 is the same as the diameter of the first through hole 11, the second through hole 21 and the third through hole 31.

[0030] A lithium battery comprises a shell 200 and a cap assembly body 100, and a battery cell 300 and an electrolyte located in a cavity surrounded by the shell 200 and the cap assembly body 100. The cap assembly body 100 adopts the above-mentioned cap assembly body 100.

[0031] During the assembly process, the end of the first stud 71 is passed through the first through hole 11, the second through hole 21 and the third through hole 31 in sequence, and then the first nut 73 and the second nut 74 are threadedly connected to the first stud 71 and the second stud 72 in sequence, respectively, so as to fix the upper cap 10, PTC20 and the explosion-proof plate 30 to avoid loosening.

[0032] Although the present invention has been described above with reference to the embodiments, various modifications may be made thereto and parts thereof may be replaced with equivalents without departing from the scope of the present invention. In particular, as long as there is no structural conflict, the various features in the embodiments disclosed in the present invention may be used in combination with each other in any manner, and the fact that these combinations are not exhaustively described in this specification is only for the sake of omitting space and saving resources. Therefore, the present invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A cap assembly of a battery, comprising a cap assembly body (100), the cap assembly body (100) comprising an electrical connection assembly and a sealing sleeve (60) arranged outside the electrical connection assembly, the electrical connection assembly comprising an orifice plate (50), an explosion-proof plate (30), a PTC (20) and an upper cap (10) which are electrically connected in sequence, the orifice plate (50), the explosion-proof plate (30), the PTC (20) and the upper cap (10) being arranged in the sealing sleeve (60) in sequence from bottom to top, characterized in that: The upper cap (10), the PTC (20) and the explosion-proof plate (30) are detachably connected in the sealing sleeve (60) via a connecting assembly, so as to prevent the upper cap (10), the PTC (20) and the explosion-proof plate (30) from becoming loose.

2. A battery cap assembly according to claim 1, characterized in that: An insulating ring is provided between the upper cap (10) and the explosion-proof plate (30) to prevent electrical contact between the upper cap (10) and the explosion-proof plate (30).

3. A battery cap assembly according to claim 1, characterized in that: A perforated plate (50) is fixedly mounted on the bottom of the explosion-proof plate (30), and a perforated plate gasket (40) is provided between the perforated plate (50) and the explosion-proof plate (30).

4. A battery cap assembly according to claim 1, characterized in that: The upper cap (10) is provided with a first through hole (11), the PTC (20) is provided with a second through hole (21), and the explosion-proof plate (30) is provided with a third through hole (31).

5. A battery cap assembly according to claim 4, characterized in that: The first through hole (11) and the second through hole (21) are aligned with each other, and the second through hole (21) and the third through hole (31) are aligned with each other.

6. A battery cap assembly according to claim 5, characterized in that: The connection component comprises: A first stud (71), wherein the first stud (71) is fixedly mounted in the inner cavity of the sealing sleeve (60), and an end of the first stud (71) passes through the first through hole (11), the second through hole (21), and the third through hole (31) in sequence; A second stud (72), wherein the second stud (72) is fixedly mounted on the end of the first stud (71), and the thread directions of the first stud (71) and the second stud (72) are arranged to be opposite; A first nut (73), wherein the first nut (73) is threadedly connected to the first stud (71); A second nut (74), wherein the second nut (74) is threadedly connected to the second stud (72).

7. A battery cap assembly according to claim 6, characterized in that: The diameter of the first stud (71) is greater than the diameter of the second stud (72), and the diameter of the first stud (71) is the same as the diameters of the first through hole (11), the second through hole (21) and the third through hole (31).

8. A lithium battery, comprising a shell (200) and a cap assembly body (100), and a battery cell (300) and an electrolyte located in a cavity enclosed by the shell (200) and the cap assembly body (100), characterized in that: The cap assembly body (100) adopts the cap assembly body (100) as claimed in any one of claims 1 to 7.

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