A cover plate assembly and a battery

Abstract

The utility model relates to a kind of cover plate assembly and battery, wherein cover plate assembly includes lower plastic and top cover sheet, the top cover sheet is superimposed on the lower plastic, the lower plastic is equipped with several first installation groove and second installation groove, the first installation groove and second installation groove extend in the direction away from the top cover sheet, the bottom of the first installation groove is equipped with first high-temperature-resistant insulating block, the bottom of the second installation groove is equipped with second high-temperature-resistant insulating block, the inner side wall of the first installation groove and second installation groove is equipped with several first opening. The utility model has the beneficial effects that reliability is good, battery short circuit can be prevented, and use safety is improved.

Description

Technical Field

[0001] This utility model relates to the field of battery cover technology, specifically to a cover assembly and a battery. Background Technology

[0002] The inner plastic layer of the battery serves to support the battery cells, provide storage space for the tabs, and prevent the adapter plates from contacting the substrate. During battery charging, the internal chemical reaction accelerates, directly causing the cell temperature to rise. Since the inner plastic layer is usually made of insulating PP material, its heat resistance is limited, and it is prone to melting in high-temperature environments. Once the inner plastic layer melts, the battery cells will lose effective support. During battery use, if subjected to vibration, the cells will move up and down, leading to damage to the core. Damage to the core can cause short circuits in the battery, which will not only seriously affect the battery's performance and lifespan but may also pose serious safety hazards such as fire and explosion. Utility Model Content

[0003] The purpose of this invention is to provide a cover plate assembly and battery that have high reliability, can prevent battery short circuits, and improve safety during use.

[0004] A cover plate assembly includes a lower plastic sheet and a top cover sheet, the top cover sheet being stacked on the lower plastic sheet. The lower plastic sheet has a plurality of first mounting grooves and second mounting grooves, the first mounting grooves and the second mounting grooves extending away from the top cover sheet. A first high-temperature resistant insulating block is installed at the bottom of the first mounting groove, and a second high-temperature resistant insulating block is installed at the bottom of the second mounting groove. A plurality of first openings are provided on the inner sidewall of the first mounting groove and the second mounting groove.

[0005] In the above scheme, the first and second high-temperature resistant insulating blocks are fixed to the bottom of the first and second mounting grooves through processes such as encapsulation. The first and second mounting grooves limit the position of the first and second high-temperature resistant insulating blocks, improving the reliability of the cover assembly. When the battery encounters extreme conditions such as high temperature, the lower plastic may melt due to excessive temperature. However, the first and second high-temperature resistant insulating blocks in this cover assembly can maintain stable physical and insulating properties under high temperature conditions, and can continue to provide support for the core and top cover sheet, effectively preventing direct contact between the core and the bottom of the top cover sheet, thereby preventing short circuits in the battery cells and improving the safety and reliability of battery use. In addition, several first openings are provided on the inner wall of the first mounting groove and the second mounting groove, so that when gas is generated inside the battery, a gas discharge channel is provided, preventing gas from accumulating inside the battery and causing excessive pressure, thereby improving the safety performance of the battery.

[0006] Furthermore, the top cover plate is provided with an explosion-proof structure, the second mounting groove is located below the explosion-proof structure, and the second high-temperature resistant insulating block includes a first base plate and a first side plate surrounding the outer periphery of the first base plate. The first side plate is provided with a second opening, and the second opening communicates with the first opening.

[0007] In the above scheme, the second high-temperature resistant insulating block adopts a structural design of a first base plate and a first side plate surrounding its outer perimeter. This structure can better adapt to the second mounting groove, increasing the contact area and connection stability between components. The first side plate of the second high-temperature resistant insulating block is provided with a second opening and communicates with the first opening of the first mounting groove. This provides a smooth flow path for gas, allowing gas to quickly and effectively gather below the explosion-proof structure. At the same time, the second high-temperature resistant insulating block can also prevent the battery cell from clogging the explosion-proof structure when the plastic melts.

[0008] Furthermore, the bottom of the second mounting groove is provided with a first opening, and the first base plate is provided with a plurality of second openings, the second openings being connected to the first openings.

[0009] In the above scheme, the first window at the bottom of the second mounting slot is connected to several second windows on the first base plate, providing a more direct and efficient exhaust channel for the gas inside the battery. When the battery generates a large amount of gas due to abnormal conditions such as overcharging or short circuit, the gas can quickly converge to the bottom of the explosion-proof structure through these connected windows. This ensures that when the internal pressure of the battery reaches the explosion-proof threshold, the explosion-proof structure can be activated in a timely and accurate manner to release the internal pressure, preventing the battery from exploding due to excessive pressure and effectively ensuring the safety of the battery during use.

[0010] Furthermore, two first mounting grooves are provided at both ends of the lower plastic, and several notches are provided on the outer side wall of the first mounting groove.

[0011] In the above scheme, two first mounting slots are located at both ends of the lower plastic. When the lower plastic is melted, the two first high-temperature resistant insulating blocks can support the two ends of the top cover and the core, thereby improving the reliability and stability of the battery. The original lower plastic without gaps may cause gas to not be able to effectively collect below the explosion-proof valve, resulting in the failure of the explosion-proof valve and the inability to detonate normally under the predetermined internal pressure. The existence of gaps provides an additional flow channel for gas, allowing the gas generated inside the battery to flow more smoothly and effectively collect below the explosion-proof valve.

[0012] Furthermore, the second high-temperature resistant insulating block includes a second base plate and a second side plate surrounding the outer periphery of the second base plate.

[0013] In the above scheme, the second base plate can provide a flat and stable support surface for components such as the top cover sheet and the core, while the second side plate surrounding the outer perimeter further enhances the stability of the entire structure, resists external forces from all directions, and prevents the second base plate from deforming under stress, thereby providing reliable support for key components inside the battery when the lower plastic melts.

[0014] Furthermore, the explosion-proof structure includes an explosion-proof hole, an explosion-proof sheet, and an explosion-proof membrane disposed on the top cover plate, wherein the explosion-proof membrane covers one end of the explosion-proof hole and the explosion-proof sheet covers the other end of the explosion-proof hole.

[0015] In the above solution, when a large amount of gas is generated inside the battery due to abnormal conditions such as overcharging, short circuit, or thermal runaway, causing a sharp increase in internal pressure, the explosion-proof structure plays a crucial role. The gas first acts on the explosion-proof membrane, and when the pressure reaches a certain level, the explosion-proof membrane will rupture. Then, the gas impacts the explosion-proof plate through the explosion-proof hole, eventually causing the explosion-proof plate to rupture, thereby releasing the high-pressure gas inside the battery in a timely manner. This prevents serious safety accidents such as explosion or fire caused by excessive internal pressure, effectively ensuring the safety of the battery during use.

[0016] Furthermore, it also includes a pole assembly, which includes an upper plastic, a sealing ring, and a pole piece. The top cover plate has a pole hole, the sealing ring is embedded in the pole hole, the upper plastic is installed on the top cover plate, and an aluminum block is embedded in the upper plastic. One end of the pole piece passes through the sealing ring and the upper plastic and is riveted to the aluminum block.

[0017] In the above scheme, one end of the terminal piece passes through the sealing ring and the upper plastic and is riveted to the aluminum block. This riveting method provides a firm and stable mechanical connection. During the use of the battery, regardless of factors such as vibration, impact or temperature change, the connection between the terminal piece and the aluminum block can remain tight and not easily loosen. This ensures the stable electrical connection between the internal electrodes of the battery and the external circuit.

[0018] A battery comprising a cover assembly as described in any of the above embodiments.

[0019] This utility model discloses a cover plate assembly and battery, which have the beneficial effects of high reliability, preventing battery short circuits, and improving safety. The first and second high-temperature resistant insulating blocks are fixed to the bottom of the first and second mounting grooves through processes such as encapsulation. The first and second mounting grooves limit the movement of the first and second high-temperature resistant insulating blocks, thus improving the reliability of the cover plate assembly. When the battery encounters extreme conditions such as high temperature, the plastic may melt due to excessive temperature. The first and second high-temperature resistant insulating blocks can maintain stable physical and insulating properties in high-temperature environments, and can continue to provide support for the core and top cover sheet, effectively preventing direct contact between the core and the bottom of the top cover sheet, thereby preventing short circuits in the battery cell and improving the safety and reliability of battery use. In addition, several first openings are provided on the inner side wall of the first mounting slot and the second mounting slot. This provides a gas discharge channel when gas is generated inside the battery, preventing gas from accumulating inside the battery and causing excessive pressure, thereby improving the safety performance of the battery. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of a cover plate assembly structure according to one embodiment.

[0021] Figure 2 This is a schematic diagram of the lower plastic structure of one embodiment.

[0022] Figure 3 This is a schematic diagram of the installation of the first and second high-temperature resistant insulating blocks according to one embodiment.

[0023] Figure 4 This is a schematic diagram of the top cover plate, pole assembly, and explosion-proof overall structure according to one embodiment.

[0024] Figure 5 This is a schematic diagram of the installation of the explosion-proof membrane and pole piece according to one embodiment.

[0025] Explanation of reference numerals: 1. Top cover plate; 2. Lower plastic; 21. First mounting groove; 211. Inner side wall; 212. Outer side wall; 22. Second mounting groove; 221. First opening; 3. First high-temperature resistant insulating block; 31. Second base plate; 32. Second side plate; 4. Second high-temperature resistant insulating block; 41. First base plate; 411. Second opening; 42. First side plate; 421. Second opening; 5. First opening; 6. Explosion-proof structure; 61. Explosion-proof sheet; 62. Explosion-proof membrane; 7. Notch; 8. Terminal assembly; 81. Upper plastic; 82. Sealing ring; 83. Terminal component; 84. Aluminum block; 9. Terminal hole. Detailed Implementation

[0026] The following will describe in further detail a cover plate assembly and a battery according to the present invention, with reference to specific embodiments and accompanying drawings.

[0027] like Figures 1 to 3As shown in a preferred embodiment, a cover plate assembly of the present invention includes a lower plastic 2 and a top cover plate 1. The top cover plate 1 is stacked on the lower plastic 2. The lower plastic 2 is provided with a plurality of first mounting grooves 21 and second mounting grooves 22. The first mounting grooves 21 and the second mounting grooves 22 extend away from the top cover plate 1. A first high-temperature resistant insulating block 3 is installed at the bottom of the first mounting groove 21, and a second high-temperature resistant insulating block 4 is installed at the bottom of the second mounting groove 22. A plurality of first openings 5 ​​are provided on the inner sidewall 211 of the first mounting groove 21 and the second mounting groove 22.

[0028] The first high-temperature resistant insulating block 3 and the second high-temperature resistant insulating block 4 are fixed to the bottom of the first mounting groove 21 and the second mounting groove 22 by processes such as coating. The first high-temperature resistant insulating block 3 and the second high-temperature resistant insulating block 4 can be made of ceramic material. The first mounting groove 21 and the second mounting groove 22 play a limiting role for the first high-temperature resistant insulating block 3 and the second high-temperature resistant insulating block 4, thereby improving the reliability of the cover plate assembly.

[0029] When the battery encounters extreme conditions such as high temperature, the lower plastic 2 may melt due to excessive temperature. However, the first high-temperature resistant insulating block 3 and the second high-temperature resistant insulating block 4 in the cover plate assembly can maintain stable physical and insulating properties under high temperature conditions. They can continue to provide support for the core and the top cover plate 1, effectively preventing direct contact between the core and the bottom of the top cover plate 1, thereby preventing short circuits in the battery cell and improving the safety and reliability of battery use.

[0030] In addition, a number of first openings 5 ​​are provided on the inner sidewall 211 of the first mounting groove 21 and the second mounting groove 22. This provides a gas discharge channel when gas is generated inside the battery, preventing gas from accumulating inside the battery and causing excessive pressure, thereby improving the safety performance of the battery.

[0031] like Figures 1 to 3As shown, in some embodiments, the top cover plate 1 is provided with an explosion-proof structure 6, the second mounting groove 22 is provided below the explosion-proof structure 6, and the second high-temperature resistant insulating block includes a first base plate 41 and a first side plate 42 surrounding the outer periphery of the first base plate 41. The first side plate 42 is provided with a second opening 421, and the second opening 421 communicates with the first opening 5. The second high-temperature resistant insulating block adopts a structure design of a first base plate 41 and a first side plate 42 surrounding its outer perimeter. This structure can better adapt to the second mounting groove 22, increasing the contact area and connection stability between components. The first side plate 42 of the second high-temperature resistant insulating block is provided with a second opening 421 and communicates with the first opening 5 of the first mounting groove 21. This provides a smooth flow path for gas, allowing gas to quickly and effectively gather below the explosion-proof structure 6. At the same time, the second high-temperature resistant insulating block can also prevent the battery cell from blocking the explosion-proof structure 6 when the lower plastic 2 is melting. In this way, when the internal pressure of the battery reaches the explosion threshold of the explosion-proof structure 6, the explosion-proof structure 6 can be activated in a timely and accurate manner to release the internal pressure, avoiding the battery from exploding or other serious safety accidents due to excessive pressure, and greatly improving the safety of the battery during use.

[0032] like Figures 1 to 3 As shown, in some embodiments, the bottom of the second mounting groove 22 is provided with a first opening 221, and the first base plate 41 is provided with a plurality of second openings 411, which are connected to the first opening 221. The first opening 221 at the bottom of the second mounting groove 22 is connected to the plurality of second openings 411 on the first base plate 41, providing a more direct and efficient exhaust channel for the gas inside the battery. When the battery generates a large amount of gas due to abnormal conditions such as overcharging or short circuit, the gas can quickly converge to the area below the explosion-proof structure 6 through these connected openings. This ensures that when the internal pressure of the battery reaches the explosion-proof threshold, the explosion-proof structure 6 can be activated in a timely and accurate manner to release the internal pressure, preventing the battery from exploding due to excessive pressure and effectively ensuring the safety of the battery during use.

[0033] like Figure 3 As shown, in some embodiments, two first mounting grooves 21 are located at both ends of the lower plastic 2, and several notches 7 are provided on the outer side wall 212 of the first mounting grooves 21. With the two first mounting grooves 21 located at both ends of the lower plastic 2, when the lower plastic 2 is melted, the two first high-temperature resistant insulating blocks 3 can support the top cover 1 and the ends of the core, thereby improving the reliability and stability of the battery. Previously, without the notches 7, the lower plastic 2 might not have been able to effectively collect gas below the explosion-proof valve, leading to valve failure and inability to detonate normally under the predetermined internal pressure. The presence of the notches 7 provides an additional flow channel for the gas, allowing the gas generated inside the battery to flow more smoothly and effectively collect below the explosion-proof valve.

[0034] like Figure 3As shown, in some embodiments, the second high-temperature resistant insulating block 4 includes a second base plate 31 and a second side plate 32 surrounding the outer periphery of the second base plate 31. The second base plate 31 can provide a flat and stable support surface for components such as the top cover sheet 1 and the core, while the second side plate 32 surrounding the outer periphery further enhances the stability of the entire structure, resists external forces from all directions, and prevents the second base plate 31 from deforming under stress, thereby providing reliable support for key components inside the battery when the lower plastic 2 melts.

[0035] like Figure 4 and Figure 5 As shown, in some embodiments, the explosion-proof structure 6 includes an explosion-proof hole, an explosion-proof sheet 61, and an explosion-proof membrane 62 disposed on the top cover 1. The explosion-proof membrane 62 covers one end of the explosion-proof hole, and the explosion-proof sheet 61 covers the other end of the explosion-proof hole. When a large amount of gas is generated inside the battery due to abnormal conditions such as overcharging, short circuit, or thermal runaway, causing a sharp increase in internal pressure, the explosion-proof structure 6 can play a crucial role. The gas first acts on the explosion-proof membrane 62. When the pressure reaches a certain level, the explosion-proof membrane 62 will rupture. Then, the gas impacts the explosion-proof sheet 61 through the explosion-proof hole, eventually causing the explosion-proof sheet 61 to rupture, thereby releasing the high-pressure gas inside the battery in a timely manner. This prevents serious safety accidents such as explosion or fire caused by excessive internal pressure, effectively ensuring the safety of the battery during use.

[0036] like Figure 4 and Figure 5 As shown, in some embodiments, the battery also includes a terminal assembly 8, which includes an upper plastic 81, a sealing ring 82, and a terminal piece 83. The top cover 1 has a terminal hole 9, the sealing ring 82 is embedded in the terminal hole 9, the upper plastic 81 is mounted on the top cover 1, and an aluminum block 84 is embedded in the upper plastic 81. One end of the terminal piece 83 passes through the sealing ring 82 and the upper plastic 81 and is riveted to the aluminum block 84. This riveting method provides a robust and stable mechanical connection. During battery use, regardless of factors such as vibration, impact, or temperature changes, the connection between the terminal piece 83 and the aluminum block 84 remains tight and is not easily loosened. This ensures a stable electrical connection between the internal electrodes of the battery and the external circuitry.

[0037] In this embodiment, the electrode assembly 8 includes a positive electrode assembly 8 and a negative electrode assembly 8. The positive electrode assembly 8 includes an upper plastic 81, a sealing ring 82, and a positive electrode post. The negative electrode assembly 8 includes an upper plastic 81, a sealing ring 82, and a negative electrode post. The top cover plate 1 is provided with two electrode post holes 9.

[0038] A battery comprising any of the cover plate assemblies described in the above embodiments.

[0039] The present invention discloses a cover plate assembly and a battery working principle and process. When the battery encounters extreme working conditions such as high temperature, even if the lower plastic 2 melts, the first high-temperature resistant insulating block 3 and the second high-temperature resistant insulating block 4 can still maintain stable physical and insulating properties in the high-temperature environment, continue to provide support for the core and the top cover plate 1, effectively avoid direct contact between the core and the bottom of the top cover plate 1, prevent short circuit of the cell, and improve the safety and reliability of the battery.

[0040] In the description of this utility model, it should be understood that terms such as "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and 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 utility model.

[0041] Furthermore, 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 technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0042] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0043] Although the description of this utility model has been given in conjunction with the specific embodiments described above, it is obvious to those skilled in the art that many substitutions, modifications, and variations can be made based on the above description. Therefore, all such substitutions, modifications, and variations are included within the spirit and scope of the appended claims.

Claims

1. A cover plate assembly, characterized in that, The device includes a lower plastic sheet and a top cover sheet, the top cover sheet being stacked on the lower plastic sheet. The lower plastic sheet is provided with a plurality of first mounting grooves and second mounting grooves, the first mounting grooves and the second mounting grooves extending away from the top cover sheet. A first high-temperature resistant insulating block is installed at the bottom of the first mounting groove, and a second high-temperature resistant insulating block is installed at the bottom of the second mounting groove. A plurality of first openings are provided on the inner sidewall of the first mounting groove and the second mounting groove.

2. The cover plate assembly according to claim 1, characterized in that, The top cover is provided with an explosion-proof structure, the second mounting groove is located below the explosion-proof structure, and the second high-temperature resistant insulating block includes a first base plate and a first side plate surrounding the outer periphery of the first base plate. The first side plate is provided with a second opening, and the second opening communicates with the first opening.

3. The cover plate assembly according to claim 2, characterized in that, The bottom of the second mounting slot is provided with a first window, and the first base plate is provided with a plurality of second windows, the second windows being connected to the first window.

4. The cover plate assembly according to claim 1, characterized in that, Two first mounting slots are located at both ends of the lower plastic, and several notches are provided on the outer side wall of the first mounting slots.

5. The cover plate assembly according to claim 4, characterized in that, The second high-temperature resistant insulating block includes a second base plate and a second side plate surrounding the outer periphery of the second base plate.

6. The cover plate assembly according to claim 2, characterized in that, The explosion-proof structure includes an explosion-proof hole, an explosion-proof sheet, and an explosion-proof membrane disposed on the top cover plate. The explosion-proof membrane covers one end of the explosion-proof hole, and the explosion-proof sheet covers the other end of the explosion-proof hole.

7. The cover plate assembly according to claim 1, characterized in that, It also includes a pole assembly, which includes an upper plastic, a sealing ring, and a pole piece. The top cover plate has a pole hole, the sealing ring is embedded in the pole hole, the upper plastic is installed on the top cover plate, and an aluminum block is embedded in the upper plastic. One end of the pole piece passes through the sealing ring and the upper plastic and is riveted to the aluminum block.

8. A battery, characterized in that, Includes the cover plate assembly as described in any one of claims 1 to 7 above.

Images