Cap assembly, battery cell and battery

Abstract

The utility model relates to the technical field of electric core, disclose a cap subassembly, electric core and battery, electric core includes: cap, for installing on steel case, first tab, be located below the cap, the first tab is structured as middle part downward protruding, the cavity is formed between the first tab and the cap, heat -resisting insulating part, connect in the outer edge of first tab, the heat -resisting insulating part is covered in the outer edge of cap, hole plate, be located below the first tab, the hole plate has exhaust hole, the middle part of first tab and hole plate electricity is connected, and sealing ring, be located between the steel case with heat -resisting insulating part, the utility model discloses electric core cap, electric core and battery, and the insulating effect is good, avoids short circuit, and the security has been improved.

Description

Technical Field

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

[0002] As an important component of cylindrical battery cells, the cap is sealed to the steel casing using a sealing ring, providing the cell's sealing function. Rubber is a primary material for sealing rings due to its excellent sealing properties; however, because of its low melting point, rubber poses a risk of melting under high-temperature conditions, potentially causing contact between the positive and negative electrodes, leading to a short circuit and safety issues. Utility Model Content

[0003] The purpose of this invention is to provide a cap assembly, a battery cell, and a battery that have good insulation, prevent short circuits, and improve safety.

[0004] To achieve the above objectives, in a first aspect, this utility model provides a cap assembly, comprising:

[0005] Cap, used for mounting on a steel casing;

[0006] A first tab is used to be mounted on the cap. The first tab is configured to bulge downward in the middle, and a cavity is formed between the first tab and the cap.

[0007] A heat-resistant insulating component is connected to the outer edge of the first protrusion, and the heat-resistant insulating component covers the outer edge of the cap;

[0008] A perforated plate, disposed below the first protrusion, the perforated plate having vent holes, and the middle portion of the first protrusion electrically connected to the perforated plate; and

[0009] A sealing ring is disposed between the steel shell, the heat-resistant insulating component, and the perforated plate.

[0010] In some embodiments, the heat-resistant insulating component includes an edging and a high-temperature electrical insulating coating, the edging being connected to the outer edge of the first protrusion and covering the outer edge of the cap, and the high-temperature electrical insulating coating covering the surface of the edging.

[0011] In some embodiments, the heat-resistant insulating element is a heat-resistant insulating edging, which is connected to the outer edge of the first protrusion and covers the outer edge of the cap.

[0012] In some embodiments, a CID element is included, wherein the middle portion of the first tab is electrically connected to the perforated plate via the CID element.

[0013] In some embodiments, the cap has an observation port.

[0014] In some embodiments, the perforated plate has a groove in the middle, the opening of the groove is disposed downward, and the middle of the first protrusion is electrically connected to the middle of the perforated plate.

[0015] In some embodiments, a pad is included, the pad being disposed between the first tab and the perforated plate.

[0016] In some embodiments, the pad is disposed on the outer periphery of the first protrusion and the perforated plate, a gap is formed between the first protrusion and the perforated plate, and the gap communicates with the vent hole of the perforated plate.

[0017] In some embodiments, the outer periphery of the first protrusion has a stepped portion.

[0018] In some embodiments, the steel shell covers the surface of the sealing ring, and both the sealing ring and the heat-resistant insulation extend horizontally out of the steel shell.

[0019] To achieve the above objectives, in a second aspect, this utility model provides a battery cell, comprising:

[0020] Steel shell;

[0021] The core is disposed within the steel shell;

[0022] The positive electrode tab is disposed in the steel shell; and

[0023] The cap assembly provided in the first aspect covers the opening of the steel shell, and the cap assembly is electrically connected to the winding core through the positive electrode tab.

[0024] To achieve the above objectives, the present invention provides a battery, comprising the battery cell provided in the second aspect.

[0025] This utility model provides a cap assembly, a battery cell, and a battery. Compared with the prior art, its advantages are as follows:

[0026] A first protrusion is positioned below the cap, and the first protrusion is configured to bulge downwards in the center, forming a cavity between the first protrusion and the cap. A heat-resistant insulating component is connected to the outer edge of the first protrusion, and the edging covers the outer edge of the cap. A perforated plate is positioned below the first protrusion, and the perforated plate has vent holes. The center of the first protrusion is electrically connected to the perforated plate, and the perforated plate is electrically connected to the positive electrode lug. A sealing ring is positioned between the steel shell, the heat-resistant insulating component, and the perforated plate. The heat-resistant insulating component provides good insulation, prevents short circuits, and improves safety. Attached Figure Description

[0027] Figure 1 This is a cross-sectional structural diagram of the cap assembly provided in an embodiment of the present utility model.

[0028] Figure 2 for Figure 1 Enlarged structural schematic diagrams of some embodiments at point A in the middle.

[0029] Figure 3 for Figure 1 Enlarged structural schematic diagrams of some other embodiments at point A.

[0030] Figure 4 This is a cross-sectional installation structure diagram of the cap assembly provided in an embodiment of the present utility model.

[0031] In the diagram: 1. Cap; 11. Cavity; 12. Observation port; 2. First protrusion; 21. Stepped section; 3. Heat-resistant insulating component; 31. Edge banding; 32. High-temperature electrical insulating coating; 4. Perforated plate; 41. Vent hole; 42. Groove; 43. Gap; 5. Sealing ring; 6. Steel shell; 7. Core; 8. Positive electrode tab; 9. CID element; 10. Pad layer. Detailed Implementation

[0032] 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 some embodiments of this application, and not all embodiments.

[0033] It should be understood that in the description of this application, the terms "upper," "lower," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are used solely for the convenience of describing this application and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application. The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. That is, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. Furthermore, unless otherwise stated, "a plurality of" means two or more.

[0034] Furthermore, the technical features involved in the different embodiments of this application described below can be combined with each other as long as they do not conflict with each other.

[0035] like Figures 1-4 As shown, some embodiments of this utility model provide a cap assembly including: a cap 1, a first protrusion 2, a heat-resistant insulating component 3, a perforated plate 4, and a sealing ring 5. In use, the steel shell 6 serves as the negative electrode of the battery cell, and the cap 1 serves as the positive electrode. To avoid short circuits, insulation between the steel shell 6 and the cap 1 is required.

[0036] The cap 1 is used to install on the steel shell 6. A first protrusion 2 is located below the cap 1 and is configured to bulge downward in the middle, forming a cavity 11 between the first protrusion 2 and the cap 1. The cavity 11 allows the gas generated in the event of thermal runaway of the core 7 to be discharged.

[0037] The heat-resistant insulating component 3 is connected to the outer edge of the first protrusion 2 and covers the outer edge of the cap 1. When the battery cell experiences excessively high temperatures during use, even if the sealing ring 5 melts, the heat-resistant insulating component 3 can still maintain insulation between the steel shell 6 and the cap 1.

[0038] The perforated plate 4 is located below the first protrusion 2. The perforated plate 4 has an exhaust hole 41, and the middle part of the first protrusion 2 is electrically connected to the perforated plate 4. Thus, when the winding core 7 experiences thermal runaway, the generated gas applies pressure to the first protrusion 2 along the perforated plate 4.

[0039] A sealing ring 5 is disposed between the steel shell 6, the heat-resistant insulating component 3, and the orifice plate 4. Thus, the sealing ring 5 maintains a seal between the steel shell 6, the heat-resistant insulating component 3, and the orifice plate 4.

[0040] Based on the above structure, the cap assembly has good insulation effect through the heat-resistant insulating component 3, which avoids short circuits and improves safety.

[0041] like Figure 2 As shown, in some embodiments, the heat-resistant insulating component 3 includes an edging 31 and a high-temperature electrical insulating coating 32. The edging 31 is connected to the outer edge of the first protrusion 2 and covers the outer edge of the cap 1. The high-temperature electrical insulating coating 32 covers the surface of the edging 31. For example, the high-temperature electrical insulating coating 32 is made of polymer coating to form an insulating film, which plays an insulating and protective role and maintains good thermal strength and dielectric properties at high temperature (250°C); or the high-temperature electrical insulating coating 32 is made of inorganic high-temperature electrical insulating coating, which can withstand higher temperatures, such as high-temperature enamel up to 700°C, phosphate-based inorganic binder coating up to 1000°C, and plasma-sprayed Al₂O₃ coating up to 1300°C.

[0042] like Figure 3 As shown, in some other embodiments, the heat-resistant insulating component 3 is a heat-resistant insulating edging, which is connected to the outer edge of the first protrusion 2 and covers the outer edge of the cap 1. Exemplarily, the heat-resistant insulating edging is made of special engineering plastics such as polytetrafluoroethylene, modified polyoxymethylene, polyphenylene sulfide, polyetheretherketone, polyphenylene ester, polyphenylene ether, and liquid crystal polymers.

[0043] like Figure 1As shown, in some embodiments, a CID element 9 is included, and the middle part of the first tab 2 is electrically connected to the perforated plate 4 through the CID element 9. Thus, when the core 7 experiences thermal runaway, the generated gas applies pressure to the first tab 2 along the perforated plate 4, causing the first tab 2 to be pushed open and deformed, thereby causing the CID element 9 to be pushed open. This disconnects the circuit between the first tab 2 and the perforated plate 4, preventing further thermal runaway.

[0044] like Figure 1 As shown, in some embodiments, the cap 1 has an observation port 12. Thus, it is possible to check whether the CID element 9 has been punctured through the observation port 12.

[0045] like Figure 1 As shown, in some embodiments, the perforated plate 4 has a groove 42 in the middle, with the opening of the groove 42 facing downwards, and the middle of the first protrusion 2 is electrically connected to the middle of the perforated plate 4. This makes the middle of the perforated plate 4 easier to deform, which is more conducive to the disconnection of the CID element 9.

[0046] like Figure 1 As shown, in some embodiments, a pad 10 is included, which is disposed between the first protrusion 2 and the perforated plate 4. The pad 10 is disposed on the outer periphery of the first protrusion 2 and the perforated plate 4, forming a gap 43 between the first protrusion 2 and the perforated plate 4. The gap 43 communicates with the vent hole of the perforated plate 4. In this way, the pad 10 stabilizes the connection structure between the first protrusion 2 and the perforated plate 4, and the gap 43 facilitates the entry of gas to compress the first protrusion 2 in the event of thermal runaway.

[0047] like Figure 1 As shown, in some embodiments, the outer periphery of the first protrusion 2 has a stepped portion 21. The stepped portion 21 causes the outer periphery of the first protrusion 2 to be in a folded state, which is beneficial for deformation after being compressed by air.

[0048] like Figure 4 As shown, in some embodiments, the steel shell 6 covers the surface of the sealing ring 5, and both the sealing ring 5 and the heat-resistant insulating member 3 extend horizontally out of the steel shell 6. This ensures insulation between the steel shell 6 and the cap 1.

[0049] The battery cell provided in some embodiments of this utility model includes: a steel shell 6, a core 7, a positive electrode tab 8, and a cap assembly provided in some embodiments. The core is disposed in the steel shell, the positive electrode tab is disposed in the steel shell, and the cap assembly covers the opening of the steel shell. The cap assembly is electrically connected to the core through the positive electrode tab. A perforated plate 4 is electrically connected to the positive electrode tab 8.

[0050] Based on the above structure, the heat-resistant insulating component 3 ensures good insulation, avoids short circuits, and improves safety.

[0051] The battery provided in some embodiments of this utility model includes the battery cell provided in some embodiments.

[0052] Based on the above structure, the battery has good insulation effect through the heat-resistant insulating component 3, which avoids short circuits and improves safety.

[0053] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and substitutions can be made without departing from the technical principles of the present utility model, and these improvements and substitutions should also be considered within the protection scope of the present utility model.

Claims

1. A cap assembly, characterized in that, include: Cap, used for mounting on a steel casing; A first protrusion is provided below the cap, and the first protrusion is configured to bulge downward in the middle, forming a cavity between the first protrusion and the cap; A heat-resistant insulating component is connected to the outer edge of the first protrusion, and the heat-resistant insulating component covers the outer edge of the cap; A perforated plate, disposed below the first protrusion, the perforated plate having vent holes, and the middle portion of the first protrusion electrically connected to the perforated plate; and A sealing ring is disposed between the steel shell and the heat-resistant insulating component.

2. The cap assembly according to claim 1, characterized in that, The heat-resistant insulating component includes an edging and a high-temperature electrical insulating coating. The edging is connected to the outer edge of the first protrusion and covers the outer edge of the cap. The high-temperature electrical insulating coating covers the surface of the edging.

3. The cap assembly according to claim 1, characterized in that, The heat-resistant insulating component is a heat-resistant insulating edging, which is connected to the outer edge of the first protrusion and covers the outer edge of the cap.

4. The cap assembly according to claim 1, characterized in that, It includes a CID element, and the middle part of the first protrusion is electrically connected to the perforated plate through the CID element.

5. The cap assembly according to claim 1, characterized in that, It includes a pad layer disposed between the first protrusion and the perforated plate.

6. The cap assembly according to claim 5, characterized in that, The pad is disposed on the outer periphery of the first protrusion and the perforated plate, and a gap is formed between the first protrusion and the perforated plate, the gap being in communication with the vent hole of the perforated plate.

7. The cap assembly according to claim 1, characterized in that, The outer periphery of the first protrusion has a stepped portion.

8. The cap assembly according to claim 1, characterized in that, The steel shell covers the surface of the sealing ring, and both the sealing ring and the heat-resistant insulating component extend horizontally out of the steel shell.

9. A battery cell, characterized in that, include: Steel shell; The core is disposed within the steel shell; The positive electrode tab is disposed in the steel shell; as well as The cap assembly as described in any one of claims 1-8 is used to seal the opening of the steel shell, and the cap assembly is electrically connected to the winding core via the positive electrode tab.

10. A battery, characterized in that, Including the battery cell as described in claim 9.

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