Battery cover plate assembly and power battery

Abstract

The application relates to the technical field of power batteries, and provides a battery cover plate assembly and a power battery. The battery cover plate assembly comprises a cover plate body and a protective isolation piece arranged on the cover plate body; the protective isolation piece comprises an isolation sheet body attached to the inner side of the cover plate body and a protective sheet body connected to the end of the isolation sheet body through a bendable connecting body; the isolation sheet body is provided with a pole post through hole for the pole post on the cover plate body to pass through, a protective cavity is formed on the protective sheet body corresponding to the pole post through hole, and a limiting guide structure is arranged between the isolation sheet body and the protective sheet body; the bendable connecting body is used for buckling the protective sheet body to the side of the isolation sheet body away from the cover plate body under the guidance of the limiting guide structure, and the protective cavity is arranged below the position of the bottom of the pole post for welding the tab. The battery cover plate assembly can play a good isolation and protection effect between the battery cover plate assembly and the pole group.

Description

Technical Field

[0001] This application relates to the field of power battery technology, and in particular to a battery cover assembly and a power battery. Background Technology

[0002] With the development of new energy technologies, lithium-ion batteries, as a typical example, are widely used in new energy vehicles due to their excellent energy storage and safety.

[0003] During battery manufacturing, the electrode assembly located inside the battery casing needs to have tabs extended from it. These tabs, of the same polarity, are then welded to terminals on the cover plate to establish electrical connection between the battery and external electrical components. The welding of the tabs to the terminals is one of the key processes in battery production, and its quality directly affects the battery's safety and reliability.

[0004] In an electrode assembly, the separator is a crucial component for isolating the positive and negative electrodes. If there are protrusions or fallen weld slag at the welding points of the tabs and terminals, these could puncture the electrode assembly, posing a significant risk to the safe operation of the separator and electrodes. For example, if the separator is punctured by weld slag, the positive and negative electrodes will be directly connected, creating a short circuit. The high temperatures generated by this short circuit can trigger a chain reaction inside the battery, leading to electrolyte decomposition, electrode material decomposition, and ultimately thermal runaway. Thermal runaway can not only damage the battery but also threaten the safety of the vehicle, personnel, and the surrounding environment. Utility Model Content

[0005] In view of this, this application aims to provide a battery cover assembly that provides a battery cover structure that can achieve good isolation and protection between the cover body and the electrode assembly.

[0006] To achieve the above objectives, the technical solution of this application is implemented as follows: A battery cover assembly, It includes a cover plate body and a protective isolation member disposed on the cover plate body; the protective isolation member includes an isolation sheet attached to the inner side of the cover plate body and a protective sheet connected to the end of the isolation sheet body by a bendable connector; The insulating sheet has a through hole for the electrode post on the cover plate body to pass through. Corresponding to the through hole, a protective cavity is formed on the protective sheet. A limiting and guiding structure is provided between the insulating sheet and the protective sheet. When the connector is bent, the protective sheet can be fastened to the side of the insulating sheet facing away from the cover plate body under the guidance of the limiting and guiding structure. The protective cavity is located below the part of the electrode post at the bottom for welding the electrode tab.

[0007] Furthermore, two pole posts are spaced apart along the length of the cover plate body, and an explosion-proof valve mounting hole is provided between the two pole posts; corresponding to the pole posts, two pole post through holes are provided on the isolation plate body; corresponding to the explosion-proof valve mounting hole, an explosion-proof valve clearance groove is provided on the isolation plate body, and a vent hole is opened on the wall plate of the explosion-proof valve clearance groove.

[0008] Furthermore, the protective sheet consists of two pieces connected to both ends of the isolation sheet along its length via the connector; a set of limiting and guiding structures is provided between each of the protective sheet and the isolation sheet, and the limiting and guiding structures are located at the end of the protective sheet away from the connector.

[0009] Furthermore, the limiting and guiding structure includes two lower limiting ribs disposed on the protective sheet and two upper limiting ribs disposed on the isolation sheet; the two lower limiting ribs are respectively disposed at the two corner positions of the sides of the protective sheet and the connecting body opposite each other; both the lower limiting ribs and the upper limiting ribs are "L" shaped, and when the protective sheet is fastened to the isolation sheet, the outer edge of the lower limiting rib slides in along the inner surface of the upper limiting rib and is limited to the inner position of the upper limiting rib.

[0010] Furthermore, the inner edge of the upper limit rib is provided with a first chamfer, and / or the outer edge of the lower limit rib is provided with a second chamfer.

[0011] Furthermore, a heat-fusion structure is provided between the isolation sheet and the protective sheet. When the protective sheet is fastened to the isolation sheet, the protective sheet is fixed to the isolation sheet through the heat-fusion structure.

[0012] Furthermore, the hot-melt structure includes a hot-melt column integrally formed on the insulating sheet body, and a hot-melt hole correspondingly disposed on the protective sheet body; the hot-melt column is inserted into and hot-melted fixedly connected to the hot-melt hole.

[0013] Furthermore, the connector includes a connecting platform protruding from the end of the insulating sheet towards the side that fastens to the protective sheet, and a bent plate connecting the top of the connecting platform and the protective sheet, wherein the bent plate is provided with a thinning groove extending through the width direction of the insulating sheet.

[0014] Furthermore, the width of the bent plate is 0.25-0.5 times the width of the isolation sheet.

[0015] Compared with related technologies, this application has the following advantages: (1) The battery cover assembly of this application, for the pole provided on the cover body, by providing a protective isolation component on the inner side of the cover body, and by using the limiting and guiding structure provided between the isolation plate and the protective plate, can accurately fasten the protective plate to the accurate position on the isolation plate, thereby forming an interval space below the pole between the isolation plate and the protective plate, thereby providing a relatively closed and isolated space for the welding part between the tab and the bottom of the pole, and the protective cavity provided on the protective plate to receive the welding slag that may fall off the pole welding part; in this way, the isolation plate forms an isolation and protection between the cover body and the tab, and the protective plate forms an isolation and protection between the pole group, the tab and the pole. The guiding and limiting function of the limiting and guiding structure ensures the convenience of the fastening operation and the accuracy of the position of the protective plate on the isolation plate, so that the protective isolation component can play a good isolation and protection role, thereby providing a structural solution that can play a good isolation and protection role between the battery cover assembly and the pole group.

[0016] (2) Two pole through holes are provided at intervals on the isolation plate body, which is compatible with the case where the cover body of most battery cover assemblies has two poles, positive and negative; then, an explosion-proof valve mounting hole for the explosion-proof valve is provided in the middle of the cover body, and an explosion-proof valve clearance groove is provided on the isolation plate body accordingly. Ventilation holes are provided on the side wall of the explosion-proof valve clearance groove, etc. When the explosion-proof valve in the battery cover assembly has a short circuit or other abnormality, causing the gas pressure in the battery cover assembly to increase sharply, the gas can be discharged to the outside through the ventilation hole and the explosion-proof valve in sequence, reducing the risk of the battery cover assembly exploding.

[0017] (3) The protective sheet adopts a split design, with each part connected to both ends of the isolation sheet, making the overall protective isolation component symmetrical and convenient for storage and fastening operations. Moreover, each protective sheet corresponds to one pole, and the protective cavity on the protective sheet can effectively accommodate and protect the welding part at the bottom of the pole. Based on the situation that one end of the protective sheet is connected to the end of the isolation sheet by the connecting body, a limiting guide structure is set at the other end of the protective sheet, which can accurately limit the position of the protective sheet to the end of the isolation sheet, thereby ensuring the convenience of the fastening operation of the protective sheet on the isolation sheet and the accuracy of the fastening position.

[0018] (4) An upper limit rib and a lower limit rib in the shape of an “L” are respectively set at the two corners of the isolation plate and the protective plate. The position of the protective plate on the isolation plate can be accurately defined in the length and width directions of the isolation plate. This not only facilitates the integral injection molding of the required limiting and guiding structure on the isolation plate and the protective plate, but also, by setting the appropriate height of the upper limit rib and the lower limit rib, the height dimension H of the gap space between the isolation plate and the protective plate can be defined. This gap space can well accommodate the insertion of the electrode tab from the electrode assembly and weld it to the bottom of the electrode post.

[0019] (5) By setting a chamfer structure at the corner of the mating side of the upper or lower limit rib, the lower limit rib can be smoothly guided to cut into the inner side of the upper limit rib and smoothly slide into the predetermined position inside the upper limit rib, thus ensuring the good guiding effect of the limit guide structure.

[0020] (6) When the protective sheet is fastened to the isolation sheet, the two are fixed together by the heat fusion structure between the isolation sheet and the protective sheet, which ensures the reliability of the fastening connection of the protective sheet on the isolation sheet.

[0021] (7) The hot-melt structure is set as an insert hot-melt form of hot-melt column and hot-melt hole. When the hot-melt column on the isolation plate is inserted into the hot-melt hole on the protective plate, the hot-melt column can be heated and hot-melted to be fixed to the hot-melt hole, which has a good positioning effect and a strong connection performance.

[0022] (8) The connector is designed as a connecting platform and a bending plate, and a thinning groove is provided on the bending plate to reduce the difficulty of bending the connector, so as to successfully complete the fastening operation of the protective plate on the isolation plate; in addition, the setting of the connecting platform can work together with the upper limit rib, lower limit rib and boss mentioned above to define the height dimension H of the space between the isolation plate and the protective plate, so as to accommodate the inserted tab well.

[0023] (9) The bending plate is designed as a sheet and its width is set to 0.25-0.5 times the width of the isolation sheet. The bending plate is easier to bend, thereby improving the convenience and yield of the protective parts assembly.

[0024] Another objective of this application is to provide a power battery having the battery cover assembly described in this application. The power battery of this application possesses the technical advantages of the aforementioned battery cover assembly. Attached Figure Description

[0025] The accompanying drawings, which form part of this application, are used to provide a further understanding of this application. The illustrative embodiments and descriptions of this application are used to explain this application. The directional terms such as front / back, up / down, etc., used therein are only used to indicate relative positional relationships and do not constitute an improper limitation of this application. In the accompanying drawings: Figure 1 This is a schematic diagram of the overall structure of the battery cover assembly described in the embodiments of this application; Figure 2 for Figure 1 The diagram shown is a structural schematic of the battery cover assembly in the deployed state of the protective isolation component; Figure 3 for Figure 2 The diagram shows the structure of the battery cover assembly from one side of the bottom. Figure 4 for Figure 1 The diagram shows the structure of the battery cover assembly from one side of the bottom. Figure 5 for Figure 3 A magnified view of the area shown in section A; Figure 6 for Figure 5 A schematic diagram of the cross-sectional structure at the location shown in BB; Figure 7 for Figure 4 The front view of the battery cover assembly shown; Figure 8 for Figure 7 A schematic diagram of the cross-sectional structure at the location shown in CC; Figure 9 for Figure 7 A schematic diagram of the cross-sectional structure at the location shown in DD; Figure 10 for Figure 9 A magnified view of the area shown in E.

[0026] Explanation of reference numerals in the attached figures: 1. Cover plate body; 10. Pole post; 11. Insulating sleeve; 12. Explosion-proof valve mounting hole; 13. Liquid injection hole; 130. Settling tank; 2. Explosion-proof valve; 3. Connector; 31. Thinning groove; 32. Connecting platform; 33. Bending plate; 4. Isolation plate body; 40. Pole post through hole; 400. Flange; 41. Upper limit rib; 410. First chamfer; 42. Hot melt column; 420. Head; 43. Explosion-proof valve clearance groove; 430. Vent hole; 431. Reinforcing rib; 5. Protective sheet body; 50. Protective cavity; 500. Hole; 51. Lower limit rib; 510. Second chamfer; 52. Hot melt hole; 521. Insertion section; 522. Hot melt section; 53. Boss. Detailed Implementation

[0027] To make the technical solution and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0028] It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0029] Furthermore, it should be stated in the description of this application that if terms indicating orientation or positional relationship, such as "up," "down," "left," "right," "front," "back," "inner," or "outer," appear, they are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this application and for clarity and conciseness of expression, and do not indicate or imply that the device or component referred to must have a specific orientation, be constructed or operated in a specific orientation, and therefore should not be construed as a limitation of this application. Taking the battery cover assembly described in this application as an example, the directional terms such as "up," "down," "left," "right," "front," and "back" used in the embodiments are defined based on the vertical direction (also known as the height direction), horizontal direction (also known as the width direction), and front-back direction (also known as the length direction) of the cover body in the battery cover. Specifically, as shown in the accompanying drawings, the X direction is the length direction of the cover body, which is also the insulating sheet and the protective sheet. The Y direction is the width direction of the cover body, which is also the insulating sheet and the protective sheet. The Z direction is the height direction of the cover body, which is also the insulating sheet and the protective sheet, that is, its thickness direction.

[0030] Furthermore, in the description of this application, unless otherwise expressly defined, the terms "installation," "connection," "joining," and "connector" should be interpreted broadly. For example, a connection can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this application in light of the specific circumstances.

[0031] In this application, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0032] During battery manufacturing, the electrode assembly located inside the battery casing needs to have tabs extended from it. These tabs, of the same polarity, are then welded to terminals on the cover plate to establish electrical connection between the battery and external electrical components. The welding of the tabs to the terminals is one of the key processes in battery production, and its quality directly affects the battery's safety and reliability.

[0033] In an electrode assembly, the separator is a crucial component for isolating the positive and negative electrodes. If there are protrusions or fallen weld slag at the welding points of the tabs and terminals, these could puncture the electrode assembly, posing a significant risk to the safe operation of the separator and electrodes. For example, if the separator is punctured by weld slag, the positive and negative electrodes will be directly connected, creating a short circuit. The high temperatures generated by this short circuit can trigger a chain reaction inside the battery, leading to electrolyte decomposition, electrode material decomposition, and ultimately thermal runaway. Thermal runaway can not only damage the battery but also threaten the safety of the vehicle, personnel, and the surrounding environment.

[0034] For these reasons, a protective gasket is usually placed on the inside of the battery cover to create isolation and protection between the electrode assembly, the battery cover, and the terminals. Currently, the plastic insulation components under the battery cover are mostly located between the aluminum plate and the tabs to ensure their insulation performance. However, there is no shaping or fixing structure between the tabs and the electrode assembly, resulting in poor consistency in the tab's condition after bending, posing a safety hazard. In particular, due to the welding of the tabs and terminals, the protruding structures or weld slag formed during welding can puncture the electrode assembly or fall into it, potentially posing a significant risk to the safe operation of the separator and electrodes within the assembly. If the separator is punctured by weld slag, the positive and negative electrodes will be directly connected, creating a short circuit.

[0035] In view of the above-mentioned problems in the related technologies, this application innovatively proposes a brand-new battery cover assembly that can play a good role in isolation and protection between the cover body 1 and the electrode assembly.

[0036] The present application will now be described in detail through exemplary embodiments. However, it should be understood that, without further description, elements, structures, and features in one embodiment may be advantageously incorporated into other embodiments.

[0037] An embodiment of the first aspect of this application provides a battery cover assembly for use in sealing the top of a power battery casing; one exemplary structure is as follows: Figures 1 to 10 As shown.

[0038] Overall, the battery cover assembly includes a cover body 1 and a protective isolator disposed on the cover body 1. The protective isolator includes an isolator sheet 4 attached to the inner side of the cover body 1 and a protective sheet 5 connected to the end of the isolator sheet 4 via a bendable connector 3. The isolator sheet 4 has an electrode post through hole 40 for the electrode post 10 on the cover body 1 to pass through. Corresponding to the electrode post through hole 40, a protective cavity 50 is formed on the protective sheet 5, and a limiting and guiding structure is provided between the isolator sheet 4 and the protective sheet 5. By bending the connector 3, the protective sheet 5 can be fastened to the side of the isolator sheet 4 facing away from the cover body 1 under the guidance of the limiting and guiding structure. The protective cavity 50 is located below the part of the electrode post 10 used for welding the electrode tab.

[0039] Based on the overall design concept described above, for the terminal post 10 provided on the cover plate body 1, a protective isolator is provided on the inner side of the cover plate body 1. Utilizing the limiting and guiding structure between the isolator 4 and the protective isolator 5, the protective isolator 5 can be accurately fastened to the precise position on the isolator 4. This creates a space below the terminal post 10 between the isolator 4 and the protective isolator 5, providing a relatively enclosed and isolated space for the welding area between the electrode tab and the bottom of the terminal post 10. The protective cavity 50 on the protective isolator 5 also collects any welding slag that may fall from the welding area of ​​the terminal post 10. In this way, the isolator 4 forms an isolation and protection between the cover plate body 1 and the electrode tab, and the protective isolator 5 forms an isolation and protection between the electrode assembly, the electrode tab, and the terminal post 10. The guiding and limiting function of the limiting and guiding structure ensures the ease of fastening the protective isolator 5 onto the isolator 4 and its accurate positioning, enabling the protective isolator to achieve a good isolation and protection effect. This provides a structural solution that can provide a good isolation and protection effect between the battery cover assembly and the electrode assembly.

[0040] It should be noted that, based on the above-mentioned overall design concept, the technical solution of this application can adopt a variety of different specific implementation structures, forms, or configuration sequences. For example, while the protective plate 5 is fastened to the isolation plate 4, it can be fixed by means of adhesive bonding, snap-fitting, or screwing. The specific arrangement sequence of the explosion-proof valve 2 and the pole 10 on the cover plate body 1, the assembly method between the cover plate body 1, the isolation plate 4, and the protective plate 5, etc., can also be flexibly adjusted. For the parts required for the implementation of the overall solution but not involved in the above overall setup, reasonable and flexible design can be carried out by referring to mature setup methods in the field and the actual situation during implementation, etc., which will not be elaborated here. The specific implementation schemes described below in this embodiment are only one of the many solutions that can be formed by the above-mentioned combinations and variations. In actual implementation, those skilled in the art can make flexible adjustments and improvements based on the actual situation. Obviously, the many solutions that can be formed by the above-mentioned combinations and variations, as well as the specific implementation schemes of this embodiment, are all within the protection scope of this application.

[0041] The following will provide a detailed description of the solution proposed in this application. To facilitate a better understanding of the solution, it is necessary to provide a preliminary explanation of the general structure of the power battery before proceeding with the detailed description below. The overall structure of a power battery typically includes a battery casing with an open top, electrode groups installed inside the battery casing, and a battery cover assembly that seals the open top of the battery casing. The cover body 1 is provided with electrode mounting holes, explosion-proof valve mounting holes 12, and electrolyte injection holes 13. The electrode 10 is inserted into the electrode mounting holes after the insulating sleeve 11 is fitted. The explosion-proof valve 2 is installed in the explosion-proof valve mounting hole 12. A settling groove 130 is typically provided at the electrolyte injection hole 13, with the injection hole 13 positioned at the bottom of the settling groove 130 to prevent electrolyte contamination of other areas on the upper surface of the cover body 1 during electrolyte addition.

[0042] Specifically, continue as Figures 1 to 5 As shown, as a preferred exemplary implementation among various feasible solutions, this embodiment has two pole posts 10 spaced apart along the length of the cover plate body 1, and an explosion-proof valve mounting hole 12 is provided between the two pole posts 10; corresponding to the pole posts 10, two pole post through holes 40 are provided on the isolation plate body 4; moreover, an annular flange 400 can be integrally formed at the edge of the pole post through hole 40, which can engage with the corresponding slots and other structures provided on the pole post mounting hole of the cover plate body 1, so as to achieve good positioning and snap-fit ​​installation when the isolation plate body 4 is attached to the cover plate body 1.

[0043] Corresponding to the explosion-proof valve mounting hole 12, an explosion-proof valve clearance groove 43 is provided on the insulating plate body 4, and a vent hole 430 is provided on the wall plate of the explosion-proof valve clearance groove 43. Two pole post through holes 40 are provided at intervals on the insulating plate body 4, which is compatible with the case where the cover body 1 of most battery cover assemblies has two positive and negative pole posts 10; then, an explosion-proof valve mounting hole 12 for installing the explosion-proof valve 2 is provided in the middle of the cover body 1, and an explosion-proof valve clearance groove 43 is provided on the insulating plate body 4 accordingly. Vent holes 430 are provided on the side wall of the explosion-proof valve clearance groove 43, etc. When a short circuit or other abnormality occurs in the electrode group in the battery cover assembly, causing a sharp increase in the gas pressure in the battery cover assembly, the gas can be discharged to the outside through the vent hole 430 and the explosion-proof valve 2 in sequence, reducing the risk of the battery cover assembly exploding. In order to improve the structural strength of the explosion-proof valve clearance groove 43, a certain number of reinforcing ribs 431 can be provided on the side wall of the explosion-proof valve clearance groove 43.

[0044] Based on the above configuration, preferably, in this embodiment, the protective sheet 5 consists of two parts connected to both ends of the isolation sheet 4 along its length via connecting bodies 3. A set of limiting and guiding structures is provided between each protective sheet 5 and the isolation sheet 4, with the limiting and guiding structures located at the end of the protective sheet 5 furthest from the connecting body 3. The protective sheet 5 adopts a split design, with each part connected to both ends of the isolation sheet 4, making the protective isolation component symmetrical overall, facilitating storage and fastening operations. Furthermore, each protective sheet 5 corresponds to one pole post 10, and the protective cavity 50 on the protective sheet 5 effectively accommodates and protects the bottom welding area of ​​the pole post 10. Since one end of the protective sheet 5 is connected to the end of the isolation sheet 4 by the connecting body 3, a limiting and guiding structure is provided at the other end of the protective sheet 5. This accurately limits the position of the protective sheet 5 to the end of the isolation sheet 4, thereby ensuring the convenience of fastening the protective sheet 5 to the isolation sheet 4 and the accuracy of the fastening position.

[0045] Of course, one or two protective cavities 50 can be provided on the protective sheet body 5, preferably as follows: Figure 5 As shown, two protective cavities 50 can be spaced apart along the width of the protective sheet 5, with each protective cavity 50 corresponding to the welding position of the electrode tab inserted on the same side on the electrode post 10. This arrangement is more reasonable. At the same time, multiple holes 500 can be opened on the side wall of the protective cavity 50, so that the protective cavity 50 has a good buffer support effect in the height direction of the battery, thereby forming a good elastic support between the electrode group and the cover plate body 1.

[0046] Continue as Figure 3 and Figure 4 As shown, as a preferred exemplary implementation among various feasible solutions, the limiting and guiding structure of this embodiment includes two lower limiting ribs 51 disposed on the protective sheet 5, and two upper limiting ribs 41 correspondingly disposed on the isolation sheet 4. The two lower limiting ribs 51 are respectively disposed at the two corner positions of the opposite sides of the protective sheet 5 and the connecting body 3, and the two upper limiting ribs 41 are correspondingly disposed at two corresponding corners on the isolation sheet 4. Simultaneously, both the lower limiting ribs 51 and the upper limiting ribs 41 are L-shaped. When the protective sheet 5 is fastened to the isolation sheet 4, the outer edge of the lower limiting rib 51 slides along the inner surface of the upper limiting rib 41 and is confined to the inner position of the upper limiting rib 41.

[0047] At the two corners of the isolation plate 4 and the protective plate 5, an upper limit rib 41 and a lower limit rib 51 in the shape of an "L" are respectively provided. The position of the protective plate 5 on the isolation plate 4 can be accurately defined in the length and width directions of the isolation plate 4. This not only facilitates the integral injection molding of the required limiting and guiding structure on the isolation plate 4 and the protective plate 5, but also, by setting the appropriate height of the upper limit rib 41 and the lower limit rib 51, the height dimension H of the gap space between the isolation plate 4 and the protective plate 5 can be defined. This gap space can well accommodate the insertion of the electrode tab from the electrode assembly and weld it to the bottom of the electrode post 10.

[0048] Based on the aforementioned arrangement of the upper limit rib 41 and the lower limit rib 51, preferably, the inner edge of the upper limit rib 41 in this embodiment is provided with a first chamfer 410, and a second chamfer 510 can also be provided on the outer edge of the lower limit rib 51. By providing a chamfer structure at the corner position of the mating side of the upper limit rib 41 or the lower limit rib 51, the lower limit rib 51 can be smoothly guided to cut into the inner side of the upper limit rib 41 and smoothly slide into the predetermined position inside the upper limit rib 41, ensuring a good guiding effect of the limiting and guiding structure.

[0049] For the connector 3 between the isolation sheet 4 and the protective sheet 5, such as Figure 5 and Figure 6 As shown, the protective sheet 5 is connected to one end of the isolation sheet 4 along its length via a bendable connector 3. As the connector 3 bends, the protective sheet 5 is fastened onto the isolation sheet 4. By providing the connector 3, the protective components can be manufactured as a single unit, facilitating storage and retrieval. Furthermore, the operation of fastening the protective sheet 5 onto the isolation sheet 4 can be easily completed by bending the connector 3, ensuring accurate positioning and fastening of the protective sheet 5 onto the isolation sheet 4.

[0050] Regarding the specific design of the connector 3, there are naturally several different structural options available. For example, an elongated hole can be formed on the connector 3 along the width direction of the insulating sheet 4. This way, when the connector 3 is bent, the position of the elongated hole can be easily bent, allowing the protective sheet 5 to be smoothly fastened onto the insulating sheet 4. However, in this embodiment, as... Figure 3 and Figure 4As shown, the connector 3 includes a connecting platform 32 protruding from the end of the insulating sheet 4 toward the side that engages with the protective sheet 5, and a bent plate 33 connecting the top of the connecting platform 32 and the protective sheet 5; the bent plate 33 is provided with a thinning groove 31 that runs through the width of the insulating sheet 4. The thinning groove 31 can be provided on only one side of the bent plate 33, or it can be provided on both sides of the bent plate 33, with the two thinning grooves 31 facing each other and their bottoms facing each other. The position where the bottom of the thinning groove 31 is located is the thinnest position on the bent plate 33, and the bent part of the connector 3 will naturally appear at this position.

[0051] Based on the above configuration, the width of the bent plate 33 in the width direction of the insulating plate 4 can be set to 0.25-0.5 times the width of the insulating plate 4. Designing the bent plate 33 as a sheet and setting its width narrower makes it easier to bend, thereby improving the convenience and yield of the protective component assembly. Furthermore, designing the connector 3 as a connecting platform 32 and the bent plate 33, and providing a thinning groove 31 on the bent plate 33, reduces the difficulty of bending the connector 3, thus smoothly completing the fastening operation of the protective plate 5 on the insulating plate 4. Moreover, the connecting platform 32, in conjunction with the aforementioned upper limit rib 41, lower limit rib 51, and boss 53, jointly defines the height H of the gap between the insulating plate 4 and the protective plate 5, thus effectively accommodating the inserted tab.

[0052] Continue as Figure 4 As shown, in this embodiment, in some preferred exemplary embodiments, the thinning groove 31 is disposed on the side of the bent plate 33 opposite to the bending, and its depth can be set between one-third and two-thirds of the thickness T2 of the bent plate 33. The bending portion of the connector 3 is formed at the bottom of the thinning groove 31. Preferably, the thickness T2 of the bent plate 33 can be set to 0.45mm-1.2mm, then the thickness of the plate at the bottom of the thinning groove 31 is limited to the range of 0.15mm-0.4mm. This makes it easier to fold the connector 3 from this position. After folding, the bent plate 33 on both sides of the folded portion of the connector 3 can fit together well. With the help of the above-mentioned connecting platform 32, the thinning groove 31H of the gap space between the snap-fit ​​protective sheet 5 and the isolation sheet 4 can be defined more easily and accurately.

[0053] For other specific dimensions of the bent plate 33 and its surrounding structure, the following settings can be adopted. (Still as...) Figure 4As shown, to facilitate the processing and forming of the thinning groove 31, its cross-section can be designed as a triangle, and the side walls on both sides of the thinning groove 31 are constructed as slopes. The width D1 of the first transition area with slopes on both sides of the * position can be set to 0.3mm-4.5mm, and the width D2 of the second transition area can be set to 0.35mm-4.8mm. This ensures a smooth overall transition after the bent plate 33 is bent, ensuring the stability of the product and preventing defects such as shrinkage that could reduce the reliability of the product. By designing the thinning groove 31 as a groove with a triangular cross-section, a slope-shaped transition will be formed on both sides of the * position at the bottom of the thinning groove 31 by the side walls of the thinning groove 31. This not only reduces the risk of breakage when the connector 3 is bent, but also results in a relatively smooth and regular shape on the outer side of the * position after bending.

[0054] In addition, the thickness T1 of the aforementioned connecting platform 32 can be set to 0.6mm-2.8mm to ensure the connection strength of the product and prevent the tabs from sagging due to deformation of the protective parts during and after bending. The thickness T2 of the bending plate 33 located between the thinning groove 31 and the protective plate 5 can be set to 0.4mm-1.2mm, or it can be the same thickness as the protective plate 5 to ensure sufficient connection strength between the isolation plate 4 and the protective plate 5.

[0055] Continue as Figures 7 to 10 As shown, in this embodiment, as a preferred exemplary implementation among various feasible solutions, a heat-fusion structure is further provided between the isolation sheet 4 and the protective sheet 5. When the protective sheet 5 is fastened to the isolation sheet 4, the protective sheet 5 is fixedly connected to the isolation sheet 4 through the heat-fusion structure. The heat-fusion structure between the isolation sheet 4 and the protective sheet 5 ensures the reliability of the fastening connection of the protective sheet 5 to the isolation sheet 4.

[0056] Specifically, the hot-melt structure of this embodiment includes a hot-melt column 42 integrally formed on the insulating sheet 4, and a hot-melt hole 52 correspondingly disposed on the protective sheet 5; the hot-melt column 42 is inserted and hot-melted fixedly connected to the hot-melt hole 52. By configuring the hot-melt structure as an insert-and-hot-melt form of the hot-melt column 42 and the hot-melt hole 52, after the hot-melt column 42 on the insulating sheet 4 is inserted into the hot-melt hole 52 on the protective sheet 5, the hot-melt column 42 can be heated and hot-melted to be fixedly connected to the hot-melt hole 52, providing good positioning and strong connection performance.

[0057] like Figure 10In some preferred exemplary embodiments, the heat-fusion hole 52 of this embodiment includes a through section 521 and a heat-fusion section 522 connected in sequence, and the radial dimension of the heat-fusion section 522 is larger than the radial dimension of the through section 521. When the protective sheet 5 is fastened to the insulating sheet 4, the heat-fusion column 42 passes through the through section 521, and the head 420 of the heat-fusion column 42 is heat-fused and compacted in the heat-fusion section 522. The hot melt hole 52 is designed with two sections: an insertion section 521 and a hot melt section 522. The radial dimension of the hot melt section 522 is larger. After the hot melt column 42 is inserted into the hot melt hole 52, the head 420 of the hot melt column 42 can protrude outside the hot melt section 522. Then, the head 420 of the hot melt column 42 is hot melted, and the molten head 420 is pressed into the hot melt section 522. The head 420, which is deformed by hot pressing, will fill the entire hot melt section 522. After the head 420 solidifies, the hot melt column 42 is securely fixed in the hot melt hole 52, which can avoid the risk of the hot melt column 42 coming out of the hot melt hole 52. Meanwhile, a boss 53 protruding towards the side of the isolation sheet 4 can be provided at the hot melt hole 52 on the protective sheet 5. When the protective sheet 5 is fastened to the isolation sheet 4, the boss 53 abuts against the isolation sheet 4, which can limit the gap space between the isolation sheet 4 and the protective sheet 5.

[0058] In summary, the battery cover assembly of this embodiment, for the terminal post 10 provided on the cover body 1, by providing a protective isolator on the inner side of the cover body 1, and utilizing the limiting and guiding structure provided between the isolator 4 and the protective isolator 5, can accurately fasten the protective isolator 5 to the precise position on the isolator 4, thereby forming an interval space below the terminal post 10 between the isolator 4 and the protective isolator 5. This provides a relatively closed and isolated space for the welding area between the electrode tab and the bottom of the terminal post 10, and the protective cavity 50 provided on the protective isolator 5 can receive welding slag and other debris that may fall from the welding area of ​​the terminal post 10. In this way, the isolator 4 forms an isolation and protection between the cover body 1 and the electrode tab, and the protective isolator 5 forms an isolation and protection between the electrode group, the electrode tab, and the terminal post 10. The guiding and limiting function of the limiting and guiding structure ensures the convenience and accuracy of the fastening operation of the protective isolator 5 on the isolator 4, enabling the protective isolator to play a good isolation and protection role, thus providing a structural solution that can play a good isolation and protection role between the battery cover assembly and the electrode group.

[0059] An embodiment of the second aspect of this application provides a power battery having a battery cover assembly provided in the embodiment of the first aspect of this application.

[0060] When using the battery cover assembly of this application, after the welding of the tabs and the fastening and fixing of the protective sheet 5 on the separator 4 are completed, the separator 4 forms an isolation and protection between the cover body 1 and the tabs, and the protective sheet 5 forms an isolation and protection between the electrode group, the tabs and the terminal post 10. The guiding and limiting function of the limiting and guiding structure ensures the convenience of the fastening operation and the accuracy of the position of the protective sheet 5 on the separator 4, so that the protective separator can play a good isolation and protection role, which is conducive to improving the safety of the battery.

[0061] The above description is merely a preferred embodiment of this application. Detailed explanations of configurations, examples of specific structural arrangements, and descriptions of assembly and connection methods are provided to ensure sufficient disclosure so that those skilled in the art can better implement this application, and are not intended to limit the scope of protection of this application. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this application should be included within the scope of protection of this application.

Claims

1. A battery cover assembly, characterized in that: It includes a cover plate body (1) and a protective isolation member disposed on the cover plate body (1); the protective isolation member includes an isolation sheet (4) attached to the inner side of the cover plate body (1) and a protective sheet (5) connected to the end of the isolation sheet (4) by a bendable connector (3). The isolation plate (4) is provided with a pole post through hole (40) for the pole post (10) on the cover plate body (1) to pass through. Corresponding to the pole post through hole (40), a protective cavity (50) is formed on the protective plate (5). A limiting guide structure is provided between the isolation plate (4) and the protective plate (5). When the connecting body (3) is bent, the protective plate (5) can be fastened to the side of the isolation plate (4) facing away from the cover plate body (1) under the guidance of the limiting guide structure. The protective cavity (50) is supported below the part of the pole post (10) used for welding the electrode tab.

2. The battery cover assembly according to claim 1, characterized in that: Two pole posts (10) are spaced apart along the length of the cover plate body (1), and an explosion-proof valve mounting hole (12) is provided between the two pole posts (10). Corresponding to the pole (10), two pole through holes (40) are provided on the isolation plate body (4); corresponding to the explosion-proof valve mounting hole (12), an explosion-proof valve clearance groove (43) is provided on the isolation plate body (4), and a vent hole (430) is opened on the wall plate of the explosion-proof valve clearance groove (43).

3. The battery cover assembly according to claim 2, characterized in that: The protective sheet (5) consists of two pieces connected to the two ends of the isolation sheet (4) along the length direction via the connector (3); a set of limiting and guiding structures is provided between each of the protective sheet (5) and the isolation sheet (4), and the limiting and guiding structures are located at the end of the protective sheet (5) away from the connector (3).

4. The battery cover assembly according to claim 3, characterized in that: The limiting guide structure includes two lower limiting ribs (51) provided on the protective sheet (5) and two upper limiting ribs (41) provided on the isolation sheet (4); the two lower limiting ribs (51) are respectively provided at the two corner positions of the sides of the protective sheet (5) and the connecting body (3). Both the lower limiting rib (51) and the upper limiting rib (41) are "L" shaped. When the protective sheet (5) is fastened to the isolation sheet (4), the outer edge of the lower limiting rib (51) slides along the inner surface of the upper limiting rib (41) and is limited to the inner position of the upper limiting rib (41).

5. The battery cover assembly according to claim 4, characterized in that: The inner edge of the upper limit rib (41) is provided with a first chamfer (410), and / or the outer edge of the lower limit rib (51) is provided with a second chamfer (510).

6. The battery cover assembly according to claim 1, characterized in that: A heat-fusion structure is also provided between the isolation sheet (4) and the protective sheet (5). When the protective sheet (5) is fastened to the isolation sheet (4), the protective sheet (5) is fixed to the isolation sheet (4) through the heat-fusion structure.

7. The battery cover assembly according to claim 6, characterized in that: The hot-melt structure includes a hot-melt column (42) integrally formed on the isolation sheet (4) and a hot-melt hole (52) correspondingly disposed on the protective sheet (5); the hot-melt column (42) is inserted and hot-melted fixed in the hot-melt hole (52).

8. The battery cover assembly according to any one of claims 1 to 7, characterized in that: The connector (3) includes a connecting platform (32) protruding from the end of the isolation sheet (4) toward the protective sheet (5) and a bent plate (33) connected between the top of the connecting platform (32) and the protective sheet (5), and the bent plate (33) is provided with a thinning groove (31) that runs through the width direction of the isolation sheet (4).

9. The battery cover assembly according to claim 8, characterized in that: The width of the bent plate (33) is 0.25-0.5 times the width of the isolation sheet (4).

10. A power battery, characterized in that: The power battery is provided with a battery cover assembly as described in any one of claims 1 to 9.

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