Cap structure and battery
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- ZHEJIANG LISUN ENERGY TECHNOLOGY CO LTD
- Filing Date
- 2025-06-25
- Publication Date
- 2026-07-14
Smart Images
Figure CN224502282U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to battery technology field especially relates to a cap structure and battery. BACKGROUND
[0002] The cap is a key part of the sealing of the top of the cylindrical battery, which mainly prevents the leakage of electrolyte and the entry of external pollutants into the battery, thereby ensuring that the battery is not damaged. At the same time, the cap is also provided with various safety protection mechanisms, including overcharge protection, overcurrent protection, pressure release, etc., to ensure the safe use of the cylindrical battery.
[0003] The existing cylindrical battery, when discharging at a large current, the isolation ring of conventional materials (such as PP, PET, etc.) is easily deformed by heat and gas pressure, which causes the isolation ring to fail to isolate the explosion-proof hole plate and the explosion-proof sheet, and the explosion-proof hole plate and the explosion-proof sheet are directly in contact and conductive, so that the CID is disconnected and cannot disconnect the circuit between the explosion-proof hole plate and the explosion-proof sheet, and the cylindrical battery continues to discharge, resulting in excessive heat generation and fire explosion of the cylindrical battery.
[0004] Therefore, there is an urgent need for a cap structure and battery to solve the above problems. SUMMARY
[0005] The purpose of the utility model is to provide a cap structure and battery, so that the battery will not continue to discharge after the CID is disconnected.
[0006] To achieve this purpose, the utility model adopts the following technical solutions:
[0007] A cap structure, comprising a top cover, an explosion-proof sheet, an explosion-proof hole plate, an isolation ring and a CID, the explosion-proof hole plate is arranged below the explosion-proof sheet, the top cover is arranged on the side of the explosion-proof sheet away from the explosion-proof hole plate, and the isolation ring is arranged between the explosion-proof hole plate and the explosion-proof sheet.
[0008] The CID connects the explosion-proof hole plate and the explosion-proof sheet.
[0009] The side of the explosion-proof sheet close to the explosion-proof hole plate and / or the side of the explosion-proof hole plate close to the explosion-proof sheet is provided with an insulating coating.
[0010] As an improvement of the above technical solution, the side of the explosion-proof sheet close to the explosion-proof hole plate and the side of the explosion-proof hole plate close to the explosion-proof sheet are both provided with the insulating coating.
[0011] As an improvement of the above technical solution, the thickness of the insulating coating is 50um-100um.
[0012] As the improvement of the above technical scheme, the isolation ring comprises a first inner core and a first thermosetting material coating, and the first thermosetting material coating covers the first inner core.
[0013] As the improvement of the above technical scheme, the thickness of the first thermosetting material coating is 30-100 um.
[0014] As the improvement of the above technical scheme, the edge of the anti-explosion sheet is folded upward to cover the periphery of the top cover.
[0015] A battery comprising the cap structure of any one of the above technical schemes, further comprising a roll core, a shell and a sealing ring.
[0016] The roll core is arranged in the shell, and the tab of the roll core is connected with the anti-explosion hole plate.
[0017] The sealing ring is arranged between the anti-explosion sheet and the shell.
[0018] As the improvement of the above technical scheme, the sealing ring comprises a second inner core and a second thermosetting material coating, and the second thermosetting material coating covers the second inner core.
[0019] As the improvement of the above technical scheme, the thickness of the second thermosetting material coating is 30-100 um.
[0020] As the improvement of the above technical scheme, the sealing ring covers the periphery of the anti-explosion sheet.
[0021] Compared with the prior art, the cap structure has the beneficial effects that:
[0022] The cap structure of the utility model, the side of the anti-explosion sheet close to the anti-explosion hole plate and / or the side of the anti-explosion hole plate close to the anti-explosion sheet is provided with an insulating coating, when the isolation ring is fused and deformed under high temperature, even if the anti-explosion hole plate contacts the anti-explosion sheet, under the action of the insulating coating, direct conduction between the anti-explosion hole plate and the anti-explosion sheet does not occur, so that after the CID is disconnected, the battery does not continue to discharge, and excessive heat production of the battery is avoided to prevent fire and explosion. BRIEF DESCRIPTION OF DRAWINGS
[0023] Figure 1 It is the structure schematic view of the battery provided by the utility model embodiment.
[0024] In the drawing:
[0025] 1, top cover;
[0026] 2, anti-explosion sheet;21, vent;
[0027] 3, anti-explosion hole plate;4, isolation ring;5, CID;
[0028] 10, winding core; 101, tab; 20, shell; 30, sealing ring. DETAILED DESCRIPTION
[0029] The specific embodiments of the present application will be further described in conjunction with the drawings and examples. The following examples are used to illustrate the present application, but not to limit the scope of the present application.
[0030] In the description of the present application, unless otherwise explicitly specified and limited, the terms "connected", "connected", "fixed" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements. For ordinary skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.
[0031] In the present application, unless otherwise explicitly specified and limited, the "upper" or "lower" of the first feature to the second feature can include the direct contact of the first and second features, or can include the contact of the first and second features through another feature between them. Moreover, the "upper", "upper" and "upper" of the first feature to the second feature include the vertical direction of the first feature above and oblique above the second feature, or only indicate that the horizontal height of the first feature is higher than that of the second feature. The "lower", "lower" and "lower" of the first feature to the second feature include the vertical direction of the first feature below and oblique below the second feature, or only indicate that the horizontal height of the first feature is less than that of the second feature.
[0032] In the description of the present application, the terms "upper", "lower", "right", and other orientation or position relationship are based on the orientation or position relationship shown in the drawings, only for the convenience of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second" are only used to distinguish in the description, and have no special meaning.
[0033] As shown in FIG. 1, Figure 1 The present embodiment provides a cap structure, which comprises a top cover 1, an explosion-proof sheet 2, an explosion-proof hole plate 3, an isolation ring 4 and a CID (current interrupt device) 5. The explosion-proof hole plate 3 is arranged below the explosion-proof sheet 2, the top cover 1 is arranged on the side of the explosion-proof sheet 2 away from the explosion-proof hole plate 3, and the isolation ring 4 is arranged between the explosion-proof hole plate 3 and the explosion-proof sheet 2. The CID 5 connects the explosion-proof hole plate 3 and the explosion-proof sheet 2. The side of the explosion-proof sheet 2 close to the explosion-proof hole plate 3 and / or the side of the explosion-proof hole plate 3 close to the explosion-proof sheet 2 is provided with an insulating coating. In the present embodiment, the isolation ring 4 is a circular ring.
[0034] Wherein, CID 5 normally functions as a conduction circuit, and when the internal pressure of the battery is too high, CID 5 disconnects the circuit between the rupture disc 2 and the rupture plate 3.
[0035] The cap structure provided in the embodiment is provided with an insulating coating on the side of the rupture disc 2 close to the rupture plate 3 and / or the side of the rupture plate 3 close to the rupture disc 2. When the isolation ring 4 melts and deforms at high temperature, even if the rupture plate 3 contacts the rupture disc 2, the rupture plate 3 and the rupture disc 2 will not directly conduct under the action of the insulating coating, so that the battery will not continue to discharge after CID 5 is disconnected, avoiding the battery from producing too much heat and causing fire and explosion.
[0036] Specifically, the material of the insulating coating in the embodiment is epoxy resin, polyurethane, acrylic, ceramic, aluminum oxide, silicone rubber or insulating paint, etc.
[0037] Optionally, the side of the rupture disc 2 close to the rupture plate 3 and the side of the rupture plate 3 close to the rupture disc 2 are both provided with an insulating coating, further avoiding the direct conduction between the rupture plate 3 and the rupture disc 2.
[0038] Optionally, the thickness of the insulating coating is 50um-100um.
[0039] Optionally, the isolation ring 4 comprises a first inner core and a first thermosetting material coating, and the first thermosetting material coating covers the first inner core. Specifically, the material of the first inner core in the embodiment is PP or PET, etc., and the material of the first thermosetting material coating is phenolic resin, urea-formaldehyde resin, melamine-formaldehyde resin, unsaturated polyester resin, epoxy resin, silicone resin, polyurethane, polyimide resin, polyether ketone resin, silicone resin, bismaleimide resin or furan resin, etc. These thermosetting materials have high thermal stability, can maintain shape and performance at high temperature, have good dimensional stability, high hardness and rigidity, are not easy to deform under high temperature and pressure, and will not melt or dissolve again after curing. By coating the first thermosetting material coating on the surface of the first inner core, the thermal stability of the isolation ring 4 can be improved, and the melting deformation of the isolation ring 4 can be avoided.
[0040] Optionally, the thickness of the first thermosetting material coating is 30-100um.
[0041] Optionally, as shown in Figure 1 The edge of the rupture disc 2 is folded upward to cover the periphery of the top cover 1.
[0042] In the embodiment, the top cover 1 is provided with an exhaust hole, and the rupture disc 2 is provided with a vent 21. When the battery is in thermal runaway, the vent 21 is opened, and the spewing material is discharged through the rupture plate, the vent 21 and the exhaust hole.
[0043] As Figure 1 shown, the battery also includes the cap structure, a roll core 10, a shell 20, and a sealing ring 30. The roll core 10 is arranged in the shell 20, and the tab 101 of the roll core 10 is connected to the explosion-proof hole plate 3. The sealing ring 30 is arranged between the explosion-proof sheet 2 and the shell 20. The battery in this embodiment is a cylindrical battery. The sealing ring 30 separates the cap structure and the shell 20, preventing electrical conduction between the cap structure and the shell 20. In this embodiment, the shell 20 is made of steel.
[0044] Optionally, the sealing ring 30 includes a second inner core and a second thermosetting material coating layer, and the second thermosetting material coating layer covers the second inner core. Specifically, the material of the second inner core in this embodiment is PP or PET, and the material of the second thermosetting material coating layer is phenolic resin, urea-formaldehyde resin, melamine-formaldehyde resin, unsaturated polyester resin, epoxy resin, silicone resin, polyurethane, polyimide resin, polyether ketone resin, silicone resin, bismaleimide resin, or furan resin. By coating the second thermosetting material coating layer on the surface of the second inner core, the thermal stability of the sealing ring 30 can be improved, and the sealing ring 30 can be prevented from melting and deforming.
[0045] Optionally, the thickness of the second thermosetting material coating layer is 30 um to 100 um.
[0046] Optionally, the sealing ring 30 covers the periphery of the explosion-proof sheet 2, ensuring the insulation and separation effect of the sealing ring 30 between the explosion-proof sheet 2 and the shell 20.
[0047] To better demonstrate that the battery with the above cap structure has good thermal stability, four kinds of cap structures are tested. The basic structures of the four kinds of cap structures are the same, and the difference lies in whether the sealing ring 30 and the isolation ring 4 are provided with a thermosetting material layer, and whether the explosion-proof sheet 2 and the explosion-proof hole plate 3 are provided with an insulating coating layer.
[0048] The specific differences of the four groups of cap structures and the experimental results are as follows:
[0049] Embodiment 1:
[0050] The sealing ring 30 and the isolation ring 4 of the cap structure are both provided with a 50 um to 100 um thermosetting material coating layer, and the side of the explosion-proof hole plate 3 close to the explosion-proof sheet and the side of the explosion-proof sheet 2 close to the explosion-proof hole plate 3 are both coated with a 50 um to 100 um insulating coating layer. A plurality of batteries form a battery module, and ten battery modules are respectively subjected to short circuit test (i.e., large current discharge test). After the large current discharge test, it is confirmed that the test data of the ten battery modules have no secondary discharge phenomenon, and the state of the sealing ring 30 and the isolation ring 4 of the cap structure of each battery is confirmed to have no deformation and no melting.
[0051] Comparative Example 1:
[0052] The battery using the sealing ring 30 and the isolation ring 4 of the cap structure both have 50um-100um thermosetting material coating, and the explosion-proof hole plate 3 and the explosion-proof sheet 2 both have no insulating coating. A plurality of batteries form a battery module. Short circuit tests (i.e. large current discharge tests) are performed on ten battery modules. After the large current discharge tests, the ten battery modules are confirmed to have no secondary discharge phenomenon. The cap structure of each battery is disassembled, and the state of the sealing ring 30 and the isolation ring 4 is confirmed to have no deformation and no melting.
[0053] Comparative Example 2:
[0054] The battery using the sealing ring 30 and the isolation ring 4 of the cap structure both have no thermosetting material coating. The explosion-proof hole plate 3 and the explosion-proof sheet 2 both have 50um-100um insulating coating. A plurality of batteries form a battery module. Short circuit tests (i.e. large current discharge tests) are performed on ten battery modules. After the large current discharge tests, the ten battery modules are confirmed to have no secondary discharge phenomenon. The cap structure of each battery is disassembled, and the state of the sealing ring 30 and the isolation ring 4 is confirmed to have no deformation and no melting.
[0055] Comparative Example 3:
[0056] The battery using the sealing ring 30 and the isolation ring 4 of the cap structure both have no thermosetting material coating. The explosion-proof hole plate 3 and the explosion-proof sheet 2 both have no insulating coating. A plurality of batteries form a battery module. Short circuit tests (i.e. large current discharge tests) are performed on ten battery modules. Eight battery modules catch fire and explode. The eight battery modules that catch fire and explode are confirmed to have secondary discharge phenomenon. The cap structure of the battery of the eight battery modules that catch fire and explode is disassembled, and the state of the sealing ring 30 and the isolation ring 4 is confirmed to have no deformation and no melting.
[0057] Cylindrical battery Test results Seal ring state Isolation ring state Example 1 10 / 10 pass No deformation no melting No deformation no melting Comparative example 1 10 / 10 pass Partial deformation melting Partial deformation melting Comparative example 2 10 / 10 pass Partial deformation melting Partial deformation melting Comparative example 3 2 / 10 pass Partial melting off Deformation melting breakage
[0058] The above only describes preferred embodiments of the present application. It should be noted that for those skilled in the art, without departing from the technical principles of the present application, a number of improvements and substitutions can be made, and these improvements and substitutions should also be considered within the protection scope of the present application.
Claims
1. A cap structure, characterized in that, It includes a top cover (1), an explosion-proof plate (2), an explosion-proof perforated plate (3), an isolation ring (4), and a CID (5). The explosion-proof perforated plate (3) is located below the explosion-proof plate (2), and the top cover (1) is located on the side of the explosion-proof plate (2) away from the explosion-proof perforated plate (3). The isolation ring (4) is sandwiched between the explosion-proof perforated plate (3) and the explosion-proof plate (2). The CID (5) connects the explosion-proof perforated plate (3) and the explosion-proof sheet (2); An insulating coating is provided on the side of the explosion-proof sheet (2) near the explosion-proof perforated plate (3) and / or on the side of the explosion-proof perforated plate (3) near the explosion-proof sheet (2).
2. The cap structure according to claim 1, characterized in that, The insulating coating is provided on both the side of the explosion-proof sheet (2) near the explosion-proof perforated plate (3) and the side of the explosion-proof perforated plate (3) near the explosion-proof sheet (2).
3. The cap structure according to claim 1 or 2, characterized in that, The thickness of the insulating coating is 50µm to 100µm.
4. The cap structure according to claim 1, characterized in that, The insulating ring (4) includes a first inner core and a first thermosetting material coating, wherein the first thermosetting material coating covers the first inner core.
5. The cap structure according to claim 4, characterized in that, The thickness of the first thermosetting material coating is 30–100 μm.
6. The cap structure according to claim 1, characterized in that, The edge of the explosion-proof sheet (2) is folded upward to cover the periphery of the top cover (1).
7. A battery, characterized in that, The cap structure includes any one of claims 1-6, and further includes a core (10), a housing (20), and a sealing ring (30); The core (10) is disposed inside the housing (20), and the tabs (101) of the core (10) are connected to the explosion-proof perforated plate (3); The sealing ring (30) is sandwiched between the explosion-proof sheet (2) and the housing (20).
8. The battery according to claim 7, characterized in that, The sealing ring (30) includes a second inner core and a second thermosetting material coating, wherein the second thermosetting material coating covers the second inner core.
9. The battery according to claim 8, characterized in that, The thickness of the second thermosetting material coating is 30–100 μm.
10. The battery according to claim 8, characterized in that, The sealing ring (30) covers the periphery of the explosion-proof sheet (2).