Cap assembly and single battery

Abstract

The utility model belongs to the technical field of batteries, and discloses a cap assembly and a single battery. The cap assembly comprises a sealing sleeve and a top cover, the sealing sleeve comprises a supporting part and an insulating part, the insulating part is arranged on the circumferential edge of the supporting part in a surrounding mode, the supporting part is provided with a first through hole, and the top cover is installed in the first through hole in a matched mode; an annular flange is arranged on the circumferential outer wall of the insulating part, a mounting ring groove for accommodating the top end part of a battery shell is formed between the annular flange and the circumferential outer wall of the insulating part, and the circumferential inner wall of the battery shell can be hermetically connected to the circumferential outer wall of the insulating part. According to the cap assembly, the assembling effect of the battery shell and the cap assembly can be improved, the sealing performance is improved, the top end part of the battery shell can be protected, and the safety is higher.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, and in particular to a cap assembly and a single battery cell. Background Technology

[0002] The cap assembly of a cylindrical lithium-ion secondary battery generally includes a sealing sleeve, a top cover, an explosion-proof sheet, an orifice plate, and an insulating gasket disposed between the explosion-proof sheet and the orifice plate. A first pressure relief hole for pressure relief is also provided on the orifice plate.

[0003] In existing technologies, such as Figure 1 As shown, after the battery cap assembly is sealed to the battery casing, the top part 11 of the battery casing 10 is not nickel-plated for protection and directly abuts against the outer wall of the sealing sleeve 100'. It is exposed to air for extended periods and is easily corroded by oxygen in the air under high temperature and humidity conditions. Rust easily forms at the port of the top part, resulting in poor product appearance, affecting customer experience, and even posing a risk of battery leakage. Currently, to protect the top part 11 during battery production, the protection method is achieved by coating, brushing, or spraying rust-preventive oil. However, this causes oil pollution, making battery cleaning and equipment maintenance inconvenient. Furthermore, most of the rust-preventive oils currently used for the top part 11 are volatile, which easily evaporates under high temperatures, failing to achieve ideal protection for the port of the battery casing 10.

[0004] Therefore, there is an urgent need to provide a new type of cap assembly and single battery cell to solve the above-mentioned technical problems in the prior art. Utility Model Content

[0005] The purpose of this utility model is to provide a cap assembly that can improve the assembly effect between the battery housing and the cap assembly, improve the sealing performance, and protect the top of the battery housing, thus enhancing safety.

[0006] To achieve this objective, the present invention adopts the following technical solution:

[0007] The cap assembly includes a sealing sleeve and a top cover. The sealing sleeve includes a support portion and an insulating portion. The insulating portion surrounds the circumferential edge of the support portion. The support portion is provided with a first through hole. The top cover is fitted into the first through hole. The circumferential outer wall of the insulating portion is provided with an annular flange. An mounting annular groove for accommodating the top end of the battery housing is formed between the annular flange and the circumferential outer wall of the insulating portion. The circumferential inner wall of the battery housing can be sealed to the circumferential outer wall of the insulating portion.

[0008] Optionally, the insulation portion comprises a bent segment, the cap assembly is fixed to the battery shell after rolling the groove, so that the bent segment is attached to the top wall of the top cover, and the battery shell can form a crimping portion on the top cover.

[0009] Optionally, the position of the mounting ring groove covered by the crimping portion is a sealing portion, the length of the sealing portion is L1, the length of the crimping portion is L2, and L1≤L2.

[0010] Optionally, the depth of the mounting ring groove is h, and h≤L2.

[0011] Optionally, 0.3mm≤h≤0.95mm.

[0012] Optionally, the width of the mounting ring groove is b, and the wall thickness of the battery shell is B, b>B.

[0013] Optionally, the circumferential inner wall of the mounting ring groove is provided with a sealing rubber layer, and the sealing rubber layer is attached to the circumferential outer wall of the battery shell.

[0014] Optionally, the thickness of the sealing rubber layer is c, and b-c≤B.

[0015] Optionally, the cap assembly further comprises a rupture disc, a hole plate and an insulation gasket, the insulation gasket is clamped between the rupture disc and the hole plate, the hole plate abuts against the support portion, and the rupture disc abuts against the bottom wall of the top cover.

[0016] Optionally, the insulation portion can be attached to the top cover after being bent, and the height of the top wall of the annular flange after being bent is not higher than the height of the topmost part of the top cover.

[0017] Another purpose of the utility model is to provide a single battery, which comprises a battery shell and a cap assembly according to any one of the above-mentioned solutions, and the top end portion of the battery shell is matched and inserted into the mounting ring groove.

[0018] Advantages:

[0019] The cap assembly in the embodiment can completely cover the top end portion of the battery shell, avoids the top end portion from contacting external air, and thus avoids the corrosion of high-temperature and humid air on the top end portion. The installation ring groove can guide and position the installation of the battery shell and the cap assembly, improves the production efficiency, and can form multiple seals between the battery shell and the cap assembly, improves the sealing effect, avoids the leakage of electrolyte, and further improves the safety of the single battery. The cap assembly can improve the assembly effect of the battery shell and the cap assembly, improves the sealing performance, and can protect the top end portion of the battery shell, and is safer. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 is a longitudinal sectional view of part of the structure of the cap assembly fixed to the battery shell after the cap assembly is installed on the battery shell according to the prior art;

[0021] Figure 2 is a longitudinal sectional view of the cap assembly installed on the battery shell according to the specific embodiment of the utility model;

[0022] Figure 3 is a longitudinal sectional view of the cap assembly according to the specific embodiment of the utility model;

[0023] Figure 4 is a longitudinal sectional view of part of the structure of the cap assembly fixed to the battery shell after the cap assembly is installed on the battery shell according to the specific embodiment of the utility model.

[0024] In the drawings:

[0025] 10, battery shell; 11, top end portion; 12, crimping portion;

[0026] 100, sealing sleeve; 110, supporting portion; 111, first through hole; 120, insulating portion; 121, annular flange; 122, installation ring groove; 123, sealing glue layer; 124, bending segment;

[0027] 200, top cover; 310, explosion-proof sheet; 320, hole plate; 330, insulating gasket. DETAILED DESCRIPTION

[0028] The utility model will be further described in detail below in combination with the drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the utility model and are not limited to the utility model. In addition, it should be noted that, in order to facilitate the description, only part of the structure related to the utility model is shown in the drawings but not all the structures.

[0029] In the description of the utility model, unless another definite provision and limitation, the term "link", "connect", "fix" should do broad sense understanding, for example, can be fixed connection, also can be detachable connection, or be integrated;Can be mechanical connection, also can be electrical connection;Can be directly connected, also can be indirectly connected through the intermediate medium, can be two elements inside the communication or two element's mutual action relation.For the ordinary skill in the art, the above-mentioned term can be understood in the utility model with the concrete meaning of the specific situation.

[0030] In the utility model, unless another definite provision and limitation, the first feature is "on" or "under" the second feature can include the first and second features directly contact, also can include the first and second features are not directly contact but contact through the other features between them.Moreover, the first feature is "on", "above" and "on" the second feature includes the first feature is directly above and obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than the second feature.The first feature is "under", "below" and "under" the second feature includes the first feature is directly below and obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than the second feature.

[0031] In the description of the embodiment, the terms "on", "under", "right", etc.Orientation or positional relationship is based on the orientation or positional relationship shown in the drawing, only for the convenience of description and simplification of operation, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the utility model.In addition, the terms "first" and "second" are only used to distinguish in the description, and have no special meaning.

[0032] In the prior art, as shown in Figure 1 After the cap assembly of the battery is sealed with the shell of the battery, the top end part 11 of the battery shell 10 is not nickel-plated for protection, directly abuts the outer wall of the sealing sleeve 100', and is exposed to air for a long time, which is easy to be corroded by oxygen in the air in a high-temperature and high-humidity environment, and the port position of the top end part 11 is easy to rust, causing poor product appearance, affecting customer experience, and even causing the risk of battery leakage.The protective effect of rust-proof oil on the port of the top end part 11 is not ideal, therefore, in order to solve the above technical problems, the utility model provides a cap assembly, and the specific structure of the cap assembly in the embodiment is described in detail as follows. Figures 2-4 The specific structure of the cap assembly in the embodiment is described in detail as follows.

[0033] As Figure 2 And Figure 3As shown, the cap assembly includes a sealing sleeve 100 and a top cover 200, the sealing sleeve 100 includes a support part 110 and an insulation part 120, the insulation part 120 is arranged at the circumferential edge of the support part 110, the support part 110 is provided with a first through hole 111, and the top cover 200 is fitted and installed in the first through hole 111; the circumferential outer wall of the insulation part 120 is provided with an annular flange 121, and the annular flange 121 and the circumferential outer wall of the insulation part 120 form a mounting ring groove 122 for accommodating the top end part 11 of the battery shell 10, and the circumferential inner wall of the battery shell 10 can be sealingly connected to the circumferential outer wall of the insulation part 120.

[0034] The cap assembly in the embodiment can insert the top end part 11 of the battery shell 10 into the mounting ring groove 122 on the outer circumferential wall of the insulation part 120 of the sealing sleeve 100 after the cap assembly is installed on the battery shell 10, the mounting ring groove 122 is formed by the annular flange 121 around the circumferential outer wall of the insulation part 120, which can completely cover the top end part 11 of the battery shell 10, avoiding the top end part 11 from contacting the external air, thereby avoiding the corrosion of the top end part 11 by high-temperature and humid air. The installation of the mounting ring groove 122 can guide and position the installation of the battery shell 10 and the cap assembly, improve the production efficiency, and at the same time, the mounting ring groove 122 can form multiple seals with the battery shell 10, improve the sealing effect, avoid the leakage of electrolyte, and further improve the safety of the single battery. The cap assembly can improve the assembly effect of the battery shell 10 and the cap assembly, improve the sealing performance, and can protect the top end part 11 of the battery shell 10, and is safer.

[0035] As shown in Figure 3 and Figure 4 The insulation part 120 includes a bent section 124, the cap assembly is fixed on the battery shell 10 after rolling, so that the bent section 124 can be attached to the top wall of the top cover 200, and the battery shell 10 can form a crimping part 12 on the top cover 200. The cap assembly is fixed on the battery shell 10 by the rolling process, so that the top end part 11 of the battery shell 10 forms a crimping part 12, and the insulation part 120 forms a bent section 124, so that the inner wall of the bent section 124 abuts against the top wall of the top cover 200, realizing the fixation of the battery shell 10, the sealing sleeve 100 and the top cover 200, and at the same time, the vertical height of the cap assembly is reduced, thereby reducing the vertical height of the single battery, reducing the volume occupied by the single battery, and improving the energy density of the single battery.

[0036] Specifically, as shown in Figure 3As shown, the bent section 124 of the sealing sleeve 100 is clamped between the crimping portion 12 and the top cover 200, so as to fix the sealing sleeve 100 to the battery shell 10. In the embodiment, the crimping portion 12 is a section parallel to the horizontal direction after the top end portion 11 of the battery shell 10 is bent, which will not be described herein.

[0037] Further, the position of the crimping portion 12 covering the mounting ring groove 122 is a sealing portion, the length of the sealing portion is L1, the length of the crimping portion 12 is L2, and L1≤L2. Such arrangement can avoid the end of the annular flange 121 protruding from the crimping portion 12, avoid the annular flange 121 occupying too large horizontal dimension after the rolling groove is finished, and avoid the annular flange 121 being rolled up after being knocked, thereby improving the stability of the connection.

[0038] In the embodiment, the depth of the mounting ring groove 122 is h, and h≤L2. The depth of the mounting ring groove 122 is Figure 3 The vertical dimension of the mounting ring groove 122 can further avoid the end of the annular flange 121 protruding from the crimping portion 12 when the battery shell 10 is completely inserted into the mounting ring groove 122, which will not be described herein.

[0039] Optionally, 0.3mm≤h≤0.95mm. It should be noted that the value of L2 is related to the battery model, the L2 value of the 18 series cylindrical battery ranges from 0.95mm to 1.3mm, and the L2 value of the 21 series cylindrical battery is larger than that of the 18 series. Therefore, in order to be compatible with the 18 series and 21 series battery models, the value of h ranges from 0.3mm to 0.95mm; the value of h can be selected according to the model of the single battery, and the value range of h can also be changed according to the demand, which will not be described herein.

[0040] Please continue to refer to Figure 3 and Figure 4 The width of the mounting ring groove 122 is b, and the wall thickness of the battery shell 10 is B, and b>B. In the embodiment, the wall thickness of the battery shell 10 is 0.25mm, and the width of the mounting ring groove 122 is 0.3±0.05mm, which can ensure that the top end portion 11 of the battery shell 10 is completely covered by the mounting ring groove 122 to form an interference connection and improve the sealing performance, thereby improving the protection ability of the top end portion 11.

[0041] Further, the circumferential inner wall of the mounting ring groove 122 is provided with a sealing adhesive layer 123, which can be attached to the circumferential outer wall of the battery shell 10. The sealing adhesive layer 123 can ensure that the mounting ring groove 122 is closely attached to the top end portion 11 of the battery shell 10, and the sealing effect of the sealing adhesive prevents moisture and air from entering from the gap, thereby improving the sealing effect.

[0042] Optionally, the thickness of the sealing glue layer 123 is c, and b-c≤B. In the embodiment, the sealing glue layer 123 occupies a part of the width of the mounting ring groove 122, so that the space formed by the sealing glue layer 123 and the mounting ring groove 122 and the top end part 11 of the battery shell 10 form an interference connection, further improving the sealing effect of the sealing glue and the protection ability of the top end part 11 of the battery shell 10.

[0043] It should be noted that the sum of the thickness of the annular flange 121 and the thickness of the sealing glue layer 123 is not less than 0.2mm, because the original sleeve label type cylindrical battery head face pad thickness is 0.2mm, to avoid affecting the installation of the single battery in the embodiment. Specifically, the thickness of the annular flange 121 is 0.15mm, and the thickness of the sealing glue layer 123 is 0.05mm, which will not be described here.

[0044] Further, the insulation part 120 can be attached to the top cover 200 after being bent, and the height of the top wall of the annular flange 121 after being bent is not higher than the height of the topmost part of the top cover 200, so as not to affect the installation of the single battery using the cap assembly, and not to hinder the electrical connection between the top cover 200 of the cap assembly and the external device.

[0045] Optionally, the cap assembly further comprises a rupture disc 310, a hole plate 320 and an insulating gasket 330, the insulating gasket 330 is clamped between the rupture disc 310 and the hole plate 320, the hole plate 320 abuts against the support part 110, and the rupture disc 310 abuts against the bottom wall of the top cover 200. In use of the cap assembly in the embodiment, the high-pressure gas in the battery can be discharged outward through the pressure relief hole of the hole plate 320, so that the rupture disc 310 above the hole plate 320 breaks, realizing exhaust pressure relief, and the rupture disc 310 can be disconnected after breaking, realizing the disconnection of the cap assembly while the insulating gasket 330 blocks the rupture disc 310 and the hole plate 320, so as to cut off the circuit in time when the battery is out of control, improving the safety.

[0046] The utility model discloses a further purpose is to provide a kind of single battery, the single battery includes battery shell 10 and the cap assembly as described in any of the above solutions, the top end portion 11 of the above battery shell 10 is cooperated and is inserted in the above mounting ring groove 122.This single battery takes cylindrical lithium ion secondary battery as an example, battery includes battery shell 10, the cap assembly described above, positive pole, negative pole, diaphragm and electrolyte, wherein battery shell 10 is preferably prepared from nickel-plated steel plate material and is set as hollow cylindrical structure with top end opening, cap assembly is connected to the top end portion 11 of battery shell 10 and seals top end portion 11, battery shell 10 and cap assembly enclose and form the internal cavity of battery, diaphragm is preferably made of polyethylene film material, diaphragm is used to separate positive pole material and negative pole material, positive pole material, negative pole material and diaphragm are spirally wound in the internal cavity of battery.

[0047] Positive pole is further electrically connected with cap assembly through positive pole busbar, and negative pole is further electrically connected with shell through negative pole busbar.

[0048] The utility model further provides a kind of electric equipment, which includes the battery described in the above solutions.The battery of the electric equipment described above can be used in portable electric equipment by combination, and the electric equipment has a battery cavity inside, which can accommodate one or more batteries, and the capacity required by the electronic device is matched, and the electronic device can be any device in the related art that needs lithium ion battery to provide power supply.

[0049] The electric equipment described above can also be powered by using battery pack, and the multiple batteries inside the battery pack can be connected in series, or the multiple single batteries can be connected in parallel, or the multiple batteries can be connected in a mixed connection of series and parallel, so that the battery pack has a capacity and power suitable for the use of electric equipment.The electric equipment that the battery pack can be applied to includes mobile phone, portable device, notebook computer, electric bicycle, electric vehicle, electric ship, electric toy, electric tool, etc., which will not be described here.

[0050] Obviously, the above embodiments of the utility model are only examples for clearly illustrating the utility model, and are not the limitation of the embodiments of the utility model.For ordinary skilled person in the art, various obvious changes, re-adjustment and replacement can be made without departing from the protection scope of the utility model.No need and also impossible to enumerate all embodiments.The any modification, equivalent replacement and improvement, etc., made within the spirit and principle of the utility model should be included in the protection scope of the claims of the utility model.

Claims

1. A cap assembly, characterized by The sealing sleeve (100) comprises a supporting part (110) and an insulating part (120) which is arranged at the circumferential edge of the supporting part (110), the supporting part (110) is provided with a first through hole (111), and the top cover (200) is fitted and installed in the first through hole (111); the circumferential outer wall of the insulating part (120) is provided with an annular flange (121), the annular flange (121) and the circumferential outer wall of the insulating part (120) form an installation ring groove (122) for accommodating the top end part (11) of the battery shell (10), and the circumferential inner wall of the battery shell (10) can be sealingly connected to the circumferential outer wall of the insulating part (120).

2. The cap assembly of claim 1, wherein The insulating part (120) comprises a bending section (124), the cap assembly is fixed after rolling the groove to the battery shell (10), so that the bending section (124) can be attached to the top wall of the top cover (200), and the battery shell (10) can form a crimping part (12) on the top cover (200).

3. The cap assembly of claim 2, wherein, The position of the crimping part (12) covering the installation ring groove (122) is a sealing part, the length of the sealing part is L1, the length of the crimping part (12) is L2, and L1≤L2.

4. The cap assembly of claim 3, wherein The depth of the installation ring groove (122) is h, and h≤L2.

5. The cap assembly of claim 4, wherein, 0.3mm≤h≤0.95mm.

6. The cap assembly of claim 5, wherein, The width of the installation ring groove (122) is b, and the wall thickness of the battery shell (10) is B, b>B.

7. The cap assembly of claim 6, wherein, The circumferential inner wall of the installation ring groove (122) is provided with a sealing adhesive layer (123), and the sealing adhesive layer (123) can be attached to the circumferential outer wall of the battery shell (10).

8. The cap assembly of claim 7, wherein, The thickness of the sealing adhesive layer (123) is c, and b-c≤B.

9. The cap assembly of any one of claims 1-8, wherein, The cap assembly further comprises an explosion-proof sheet (310), a hole plate (320) and an insulating gasket (330), the insulating gasket (330) is clamped between the explosion-proof sheet (310) and the hole plate (320), the hole plate (320) abuts against the supporting part (110), and the explosion-proof sheet (310) abuts against the bottom wall of the top cover (200).

10. The cap assembly of any one of claims 1-8, wherein, The insulating part (120) can be attached to the top cover (200) after being bent, and the height of the top wall of the annular flange (121) after being bent is not higher than the height of the topmost part of the top cover (200).

11. A single cell characterized by The sealing sleeve (100) comprises a supporting part (110) and an insulating part (120) which is arranged at the circumferential edge of the supporting part (110), the supporting part (110) is provided with a first through hole (111), and the top cover (200) is fitted and installed in the first through hole (111); the circumferential outer wall of the insulating part (120) is provided with an annular flange (121), the annular flange (121) and the circumferential outer wall of the insulating part (120) form an installation ring groove (122) for accommodating the top end part (11) of the battery shell (10), and the circumferential inner wall of the battery shell (10) can be sealingly connected to the circumferential outer wall of the insulating part (120).

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