Cover plate insulator, cover plate structure and battery

Abstract

This application relates to the field of battery technology, and in particular to a cover plate insulator, a cover plate structure, and a battery. The cover plate insulator includes a first insulating part, a second insulating part, and a folded connecting part. In the assembled state, the first and second insulating parts are stacked along a first direction. The first insulating part is attached to the side of the cover plate body facing the electrode assembly. The second insulating part is disposed between the electrode assembly body and the electrode tab. The folded connecting part is disposed on one side of the first and second insulating parts along a second direction, and connects the first and second insulating parts. The electrode tab can extend from the third-direction side of the cover plate insulator between the first and second insulating parts and connect with a polarity connection part provided on the cover plate body. According to the cover plate insulator, cover plate structure, and battery provided in this application, the risk of short circuits caused by electrode settling in the bottom venting scheme is reduced, achieving double insulation protection.

Description

Technical Field

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

[0002] Currently, in battery module and pack structure design, the cover plate, as a key component of the battery, needs to be reliably insulated from the internal electrode assembly to avoid safety hazards such as short circuits inside the battery. The electrode assembly typically includes the electrode assembly body and tabs extending from the electrode assembly body. The tabs need to connect to the polarity connection part on the cover plate body to conduct current. Therefore, the insulation structure between the cover plate body and the electrode assembly must simultaneously meet the dual requirements of insulation isolation and tab connection.

[0003] In existing technologies, insulation between the cover plate body and the electrode assembly is mostly achieved using a single insulating sheet or a simple insulation structure. However, in battery structures employing a bottom-venting design (i.e., placing the explosion-proof valve below the battery), the electrode assembly is prone to settling due to its own weight. This can lead to short circuits caused by the insertion of the electrode tabs into the electrode assembly body. Furthermore, during the settling of the electrode assembly, the insulating components are prone to displacement, resulting in insulation failure between the cover plate body and the electrode assembly. In addition, during the assembly process of traditional insulation structures, the positioning accuracy of the insulating components, cover plate body, and electrode assembly is low, making assembly deviations likely and further reducing insulation reliability. This makes it difficult to meet the high requirements for insulation structure stability and adaptability in bottom-venting designs. Utility Model Content

[0004] The purpose of this application is to provide a cover plate insulator, a cover plate structure, and a battery, in order to solve to some extent the problems existing in the prior art in battery structures using a bottom-venting scheme, such as the electrode assembly being prone to settling due to its own weight, causing short circuits when the electrode tabs are inserted into the electrode assembly body, and the insulation component being prone to displacement when the electrode assembly settles, leading to insulation failure between the cover plate body and the electrode assembly. In addition, during the assembly process of traditional insulation structures, the positioning accuracy of the insulation component, the cover plate body, and the electrode assembly is low, and assembly deviations are prone to occur, further reducing insulation reliability and making it difficult to meet the high requirements for the stability and adaptability of the insulation structure in the bottom-venting scheme.

[0005] According to a first aspect of this application, a cover plate insulator is provided for insulation between a cover plate body of a battery and an electrode assembly, the electrode assembly including an electrode assembly body and tabs extending from the electrode assembly body; The cover plate insulation component includes a first insulation portion, a second insulation portion, and a folding connecting portion. When the cover plate insulation component is in the assembled state, the first insulation portion and the second insulation portion are stacked along a first direction. The first insulation portion is attached to the side of the cover plate body facing the electrode assembly. The second insulation portion is disposed between the electrode assembly body and the electrode tab. The folding connecting portion is disposed on one side of the first insulation portion and the second insulation portion in a second direction, and the folding connecting portion connects the first insulation portion and the second insulation portion. The electrode tab can extend from the third-direction side of the cover plate insulator into the space between the first insulating part and the second insulating part and connect with the polar connection part provided on the cover plate body. The third-direction is perpendicular to the second direction, and the first direction is perpendicular to the plane determined by the second direction and the third-direction.

[0006] Preferably, it further includes a snap-fit ​​assembly, the snap-fit ​​assembly including a first snap-fit ​​member and a second snap-fit ​​member, wherein the first of the first insulating part and the second insulating part is provided with the first snap-fit ​​member, and the second of the first insulating part and the second insulating part is provided with the second snap-fit ​​member at the corresponding position; The first and second snap-fit ​​components can be snapped together to fix the first insulating part and the second insulating part.

[0007] Preferably, the cover plate body is further provided with an explosion-proof valve, and the polarity connection part includes a first pole and a second pole, wherein the first pole, the explosion-proof valve and the second pole are spaced apart along the second direction; The first insulating portion is sequentially divided into a first polarity isolation region, a first exhaust region, and a second polarity isolation region along the second direction; The second insulating portion is sequentially divided into a first polarity support region, a second exhaust region, and a second polarity support region along the second direction; The first pole post, the first polarity isolation area, and the first polarity support area are arranged facing each other along the first direction; the explosion-proof valve, the first exhaust area, and the second exhaust area are arranged facing each other along the first direction; the second pole post, the second polarity isolation area, and the second polarity support area are arranged facing each other along the first direction. The first polarity isolation region is provided with a first clearance hole, and the second polarity isolation region is provided with a second clearance hole. At least a portion of the first pole post is exposed by the first clearance hole, and at least a portion of the second pole post is exposed by the second clearance hole.

[0008] Preferably, the second insulating portion has a first end and a second end opposite to each other in the second direction, the first end being connected to the folded connecting portion, and the second end being provided with the snap-fit ​​assembly; And / or, relative to the first clearance hole, the snap-fit ​​component is provided on the side of the first polarity isolation area closer to the second exhaust area; And / or, relative to the second clearance hole, the snap-fit ​​assembly is provided on the side of the second polarity isolation zone closest to the second exhaust zone.

[0009] Preferably, the first snap-fit ​​element is a first variable-diameter snap-fit ​​hole extending along the first direction, and the second snap-fit ​​element is an elastic snap-fit ​​post extending along the first direction; In the first direction, from one end of the first object facing the second object to the other end, the diameter of the first variable diameter card hole gradually decreases; The end of the elastic locking post furthest from the second is provided with a locking protrusion, and the outer diameter of the locking protrusion is greater than the minimum value of the diameter of the first variable diameter locking hole.

[0010] Preferably, the first is the first insulating part, and the second is the second insulating part; The first variable diameter locking hole penetrates the first insulating part, and a second variable diameter locking hole is also provided at the corresponding position of the cover plate body. The elastic locking post can penetrate the first variable diameter locking hole and engage with the second variable diameter locking hole.

[0011] Preferably, the first insulating part, the second insulating part, and the folded connecting part are an integral flexible injection molded part, the thickness of the folded connecting part is less than the thickness of the first insulating part, and the thickness of the folded connecting part is less than the thickness of the second insulating part; Alternatively, the folding connection can be a hinge.

[0012] The second aspect of this application also provides a cover plate structure, including the cover plate body, polarity connection portion and cover plate insulating member as described in any of the above embodiments, thus possessing all the beneficial technical effects of the cover plate insulating member, which will not be repeated here.

[0013] An embodiment of the second aspect of this application also provides a battery, including the aforementioned cover plate body, electrode assembly, and cover plate insulating member as described in any of the aforementioned embodiments, or including the aforementioned electrode assembly and cover plate mechanism as described in any of the aforementioned embodiments. Therefore, it possesses all the beneficial technical effects of the cover plate insulating member, which will not be elaborated further here.

[0014] Preferably, the electrode assembly includes two electrode bodies stacked together along the third direction, and the electrode tabs of the two electrode bodies extend from both ends of the cover plate insulator in the third direction into the space between the first insulating portion and the second insulating portion.

[0015] Compared with the prior art, the beneficial effects of this application are as follows: The cover plate insulation component provided in this application has a first insulating part attached to the side of the cover plate body facing the electrode assembly, which effectively isolates the cover plate body from the electrode assembly and avoids short circuits caused by direct contact between the two. The second insulating part is disposed between the electrode assembly body and the electrode tab, which can specifically isolate the electrode assembly body from the electrode tab. Even when the electrode assembly shifts position due to gravity settlement, it can still prevent the electrode tab from inserting into the electrode assembly body, significantly reducing the risk of short circuits caused by electrode assembly settlement in the down-draft scheme, and achieving double insulation protection. The first and second insulating parts are connected as one unit by a folded connecting part and are stacked along the first direction. The folded connecting part can provide a certain structural buffer and adaptive deformation capability. When the electrode assembly settles, the folded connecting part can adaptively adjust with the displacement of the electrode assembly, avoiding breakage or displacement of the insulation component due to rigid tension, ensuring that the insulation structure can still function stably when the position of the electrode assembly changes, and improving the structural stability of the insulation component under complex working conditions. The tabs extend from the third-direction side of the cover plate insulation component, connecting between the first and second insulation parts and the polarity connection part. This design fully adapts to the lead-out path of the tabs, avoiding the insulation failure problem caused by excessively large gaps in the tab connection in traditional insulation structures. Simultaneously, the integrated folding structure facilitates rapid positioning during assembly. The layout of the first insulation part attached to the cover plate body and the second insulation part corresponding to the gap between the electrode assembly body and the tab improves the assembly accuracy of the insulation component, cover plate body, and electrode assembly, simplifying the assembly process. While ensuring the safety advantage of the explosion-proof valve's downward venting away from the passenger compartment, this design provides crucial structural support for the widespread application of downward venting solutions, enhancing the overall safety performance of the battery.

[0016] To make the above-mentioned objectives, features and advantages of this application more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the specific embodiments of this application or the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0018] Figure 1A schematic diagram of the battery in its unfolded state, provided in an embodiment of this application. Figure 2 A front view of the cover plate insulation component provided in an embodiment of this application; Figure 3 This is an isometric structural schematic diagram of the cover plate insulating component provided in the embodiments of this application; Figure 4 Another isometric structural schematic diagram of the cover plate insulating component provided in the embodiments of this application; Figure 5 A cross-sectional view of the cover plate insulation component provided in an embodiment of this application; Figure 6 for Figure 5 An enlarged structural schematic diagram of the provided cover plate insulation component at point A; Figure 7 for Figure 5 An enlarged structural schematic diagram of the provided cover plate insulation component at point B; Figure 8 This is a cross-sectional view of the battery provided in an embodiment of this application. Figure 9 for Figure 8 An enlarged structural diagram of the provided cover plate insulation component at point C.

[0019] Figure label: 11-First insulating part; 111-First polarity isolation area; 112-Second polarity isolation area; 113-First exhaust area; 12-Second insulating part; 121-First polarity support area; 122-Second polarity support area; 123-Second exhaust area; 13-Folding connection part; 141-First snap-fit ​​part; 142-Second snap-fit ​​part; 1420-Post body; 1421-Snap-fit ​​protrusion; 1422-Elastic notch; 151-First exhaust hole; 152-Second exhaust hole; 161-First clearance hole; 162-Second clearance hole; 20-Cover plate body; 201-Second diameter reducing snap hole; 211-First pole post; 212-Second pole post; 22-Explosion-proof valve; 30-Pole group body; 31-Pole tab.

[0020] F1 - First direction; F2 - Second direction; F3 - Third direction. Detailed Implementation

[0021] The technical solutions of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are some embodiments of this application, but not all embodiments.

[0022] The components of the embodiments of this application described and shown in the accompanying drawings can be arranged and designed in a variety of different configurations. Therefore, the following detailed description of the embodiments of this application provided in the drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application.

[0023] Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0024] In the description of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this application 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 application. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0025] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; 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; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0026] The following reference Figures 1 to 9 This application describes cover plate insulation, cover plate structure, and battery according to some embodiments.

[0027] See Figures 1 to 9As shown, an embodiment of the first aspect of this application provides a cover plate insulator for insulation between a cover plate body 20 of a battery and an electrode assembly. The electrode assembly includes an electrode assembly body 30 and tabs 31 extending from the electrode assembly body 30. The cover plate insulator includes a first insulating portion 11, a second insulating portion 12, and a folding connecting portion 13. When the cover plate insulator is in an assembled state, the first insulating portion 11 and the second insulating portion 12 are stacked along a first direction F1. The first insulating portion 11 is attached to the side of the cover plate body 20 facing the electrode assembly. The second insulating portion 12 is disposed between the electrode assembly body 30 and the tabs 31. The folding connecting portion 13 is disposed on one side of the first insulating portion 11 and the second insulating portion 12 in a second direction F2, and the folding connecting portion 13 connects the first insulating portion 11 and the second insulating portion 12. The tab 31 can extend from the side of the cover plate insulator in the third direction F3 and connect between the first insulating part 11 and the second insulating part 12 and the polar connection part provided on the cover plate body 20. The third direction F3 is perpendicular to the second direction F2, and the first direction F1 is perpendicular to the plane determined by the second direction F2 and the third direction F3.

[0028] According to the above-mentioned technical features, the cover plate insulating component is attached to the side of the cover plate body 20 facing the electrode assembly via the first insulating part 11, which can effectively isolate the cover plate body 20 and the electrode assembly, avoiding short circuits caused by direct contact between the two; the second insulating part 12 is disposed between the electrode assembly body 30 and the electrode tab 31, which can specifically isolate the electrode assembly body 30 and the electrode tab 31. Even if the electrode assembly shifts position due to gravity settlement, it can still prevent the electrode tab 31 from inserting into the electrode assembly body 30, significantly reducing the risk of short circuits caused by electrode assembly settlement in the downward exhaust scheme, and achieving double insulation protection. The first insulating part 11 and the second insulating part 12 are connected as one unit by the folding connecting part 13 and are stacked along the first direction F1. The folding connecting part 13 can provide a certain structural buffer and adaptive deformation capability. When the electrode assembly settles, the folded connection 13 can adaptively adjust with the displacement of the electrode assembly, preventing the insulation from breaking or shifting due to rigid tension. This ensures the insulation structure can still function stably when the electrode assembly position changes, improving the structural stability of the insulation under complex working conditions. The tab 31 can extend from the side of the cover plate insulation on the third direction F3 and connect between the first insulation part 11 and the second insulation part 12 to the polarity connection part. This design fully adapts to the lead-out path of the tab 31, avoiding the insulation failure problem caused by excessively large gaps in the connection of the tab 31 in traditional insulation structures. At the same time, the integrated folded structure facilitates quick positioning during assembly. The first insulation part 11 is attached to the cover plate body 20, and the second insulation part 12 corresponds to the layout of the gap between the electrode assembly body 30 and the tab 31, which can improve the assembly accuracy of the insulation, the cover plate body 20, and the electrode assembly, and simplify the assembly process. While ensuring the safety advantage of the explosion-proof valve 22 being far away from the passenger compartment, it provides key structural support for the promotion and application of the bottom exhaust scheme, improving the overall safety performance of the battery.

[0029] like Figures 2 to 4 and Figure 8 As shown in the figure, F1 can be an example of the first direction F1, F2 can be an example of the second direction F2, and F3 can be an example of the third direction F3. Preferably, the figure shows an example where any two of the first direction F1, the second direction F2, and the third direction F3 are perpendicular to each other, so as to accommodate the structure of most square batteries. Taking a square battery as an example, the first direction F1 can be the length direction of the square battery, the second direction F2 can be the width direction of the square battery, and the third direction F3 can be the thickness direction of the square battery. In this way, by using the side of the cover plate insulator on the third direction F3 to introduce the tab 31, the connection area of ​​the tab 31 can be effectively increased, ensuring the current flow area between the polarity connection part and the electrode assembly.

[0030] It should be noted that, in the above-mentioned assembled state of the cover plate insulating component, the first insulating part 11 and the second insulating part 12 are stacked together along the first direction F1. This assembled state can be understood as follows: Figure 8 and Figure 9 As shown, the cover insulating member is assembled inside the battery. When the cover insulating member is not assembled, the first insulating portion 11 and the second insulating portion 12 of the cover insulating member can... Figures 1 to 5 As shown, it is in the unfolded state to facilitate the assembly of components such as the cover plate structure and pole assembly. In other words, the aforementioned folding connection 13 can switch between the folded and unfolded states.

[0031] Preferably, such as Figure 1 As shown, the above-mentioned pole assembly may include two pole bodies 30. The pole tabs 31 of the two pole bodies 30 can be extended from the two sides of the cover plate in the third direction F3 into the space between the first insulating part 11 and the second insulating part 12 respectively, so as to achieve electrical connection with the polarity connection part respectively. This ensures the independence of the electrical connection of the bipolar structure and avoids mutual interference of the electrical connection of the bipolar structure.

[0032] Preferably, such as Figures 1 to 4 As shown, the aforementioned cover plate insulation component may further include a snap-fit ​​assembly, which includes a first snap-fit ​​member 141 and a second snap-fit ​​member 142. The first snap-fit ​​member 141 is provided on the first of the first insulating part 11 and the second insulating part 12, and the second snap-fit ​​member 142 is provided at the corresponding position of the second of the first insulating part 11 and the second insulating part 12. The first snap-fit ​​member 141 and the second snap-fit ​​member 142 can snap together to fix the first insulating part 11 and the second insulating part 12. In this way, on the one hand, the connection stability of the first insulating part 11 and the second insulating part 12 is enhanced, and the relative displacement of the two is prevented under operating conditions such as electrode settling and battery vibration, ensuring the continued effectiveness of the double insulation structure (isolation between the cover plate body 20 and the electrode assembly, and isolation between the electrode assembly body 30 and the electrode tab 31); on the other hand, the snap-fit ​​engagement is a detachable fixing method, which facilitates the assembly and maintenance of the cover plate insulation component.

[0033] Preferably, such as Figures 1 to 4As shown, the first locking member 141 can be a first variable-diameter locking hole extending along the first direction F1, and the second locking member 142 can be an elastic locking post extending along the first direction F1. Specifically, in the direction F1 from one end facing the second member to the other, the diameter of the first variable-diameter locking hole gradually decreases. The end of the elastic locking post furthest from the second member is provided with a locking flange 1421, and the outer diameter of the locking flange 1421 is larger than the minimum diameter of the first variable-diameter locking hole. Thus, the first variable-diameter locking hole guides the elastic locking post to gradually lock, and the locking flange 1421 forms a mechanical lock with the minimum diameter of the locking hole, preventing disengagement due to vibration or external force and improving the reliability of the fixation.

[0034] Preferably, such as Figures 5 to 9 As shown in the figure, an example is shown where the first part is the first insulating part 11 and the second part is the second insulating part 12.

[0035] Preferably, such as Figure 9 As shown, the first variable diameter locking hole can penetrate the first insulating part 11, and a second variable diameter locking hole 201 is also provided at the corresponding position of the cover plate body 20. The elastic locking post can penetrate the first variable diameter locking hole and the second variable diameter locking hole 201 to engage, which not only fixes the first insulating part 11 and the second insulating part 12, but also fixes the entire cover plate insulating part to the cover plate body 20, preventing the insulating part from shifting relative to the cover plate body 20, ensuring the alignment accuracy of the insulating part with the pole and the explosion-proof valve 22, and maintaining the stability of the isolation and exhaust functions.

[0036] Preferably, such as Figure 7 and Figure 9 As shown, the aforementioned elastic locking post may include a post body 1420 extending along the first direction F1, and the aforementioned locking protrusion 1421 may be disposed on the outer edge of the end of the post body 1420 opposite to the second insulating part 12.

[0037] Preferably, such as Figure 7 and Figure 9 As shown, the aforementioned elastic locking post may also be provided with an elastic notch 1422. The elastic notch 1422 extends from one end of the elastic locking post opposite to the second insulating part 12 along the first direction F1 to the other end of the elastic locking post. The elastic notch 1422 can penetrate the elastic locking post in a predetermined direction to divide the elastic locking post into two parts, thereby facilitating the elastic deformation of one end of the locking protrusion 1421 of the elastic locking post, so that the elastic locking post can be inserted into the first variable diameter hole and the second variable diameter hole. The predetermined direction is any direction on the plane perpendicular to the first direction F1 (for example, the second direction F2, the third direction F3, or the clear sky direction on the plane perpendicular to the first direction F1).

[0038] In an embodiment, such as Figure 8As shown, the cover plate body 20 can be equipped with an explosion-proof valve 22, and the polarity connection part includes a first pole post 211 and a second pole post 212. The first pole post 211, the explosion-proof valve 22 and the second pole post 212 are arranged at intervals along the second direction F2 to realize the electrical connection function and heat exhaust function of the cover plate structure.

[0039] Correspondingly, such as Figures 1 to 4 As shown, the first insulating part 11 can be sequentially divided into a first polarity isolation region 111, a first exhaust region 113, and a second polarity isolation region 112 along the second direction F2. The second insulating part 12 is sequentially divided into a first polarity support region 121, a second exhaust region 123, and a second polarity support region 122 along the second direction F2. The first pole post 211, the first polarity isolation region 111, and the first polarity support region 121 are arranged facing each other along the first direction F1; the explosion-proof valve 22, the first exhaust region 113, and the second exhaust region 123 are arranged facing each other along the first direction F1; and the second pole post 212, the second polarity isolation region 112, and the second polarity support region 122 are arranged facing each other along the first direction F1. The first polarity isolation zone 111 is provided with a first clearance hole 161, and the second polarity isolation zone 112 is provided with a second clearance hole 162. At least a portion of the first pole post 211 is exposed by the first clearance hole 161, and at least a portion of the second pole post 212 is exposed by the second clearance hole 162. In this way, the polarity isolation zone / support zone specifically covers the pole post (i.e., the first polarity isolation zone 111 / first polarity support zone 121 specifically covers the first pole post 211; the second polarity isolation zone 112 / second polarity support zone 122 specifically covers the second pole post 212), avoiding unnecessary contact between the pole post and the pole assembly and the tab 31, and reducing the risk of short circuit. The exhaust zone is directly opposite the explosion-proof valve 22, ensuring that high-temperature gas can be smoothly discharged through the exhaust zone in case of thermal runaway, without being blocked by the cover plate insulation, thus taking into account both insulation and exhaust functions.

[0040] Preferably, the first exhaust zone 113 is provided with a first exhaust hole 151 that penetrates the first insulating part 11 along the first direction F1, and the second exhaust zone 123 is provided with a second exhaust hole 152 that penetrates the second insulating part 12 along the first direction F1.

[0041] Preferably, such as Figures 1 to 4 As shown, the second insulating part 12 has a first end and a second end that are opposite to each other in the second direction F2. The first end is connected to the folding connecting part 13, and the second end is provided with a snap-fit ​​component. The first end of the second insulating part 12 can be bound to the first insulating part 11 through the folding connecting part 13, and the second end of the second insulating part 12 can be fixed to the first insulating part 11 through the snap-fit ​​component provided at the second end, effectively preventing the two ends of the second insulating part 12 in the second direction F2 from lifting due to the settlement of the electrode group.

[0042] Preferably, such as Figures 1 to 4 As shown, a snap-fit ​​component is provided on the side of the first polar isolation area 111 near the second exhaust area 123, relative to the first clearance hole 161. In this way, the snap-fit ​​component can effectively prevent the first polar isolation area 111 and the first polar support area 121 from separating from each other when the airflow impacts the first exhaust area 113 or the second exhaust area 123, thus affecting the insulation support effect of the cover plate insulation component and ensuring the stability of the connection between the first polar isolation area 111 and the first polar support area 121.

[0043] Similarly, such as Figures 1 to 4 As shown, a snap-fit ​​component is provided on the side of the second polar isolation area 112 near the second exhaust area 123 relative to the second clearance hole 162. Its beneficial effect is similar to that of the snap-fit ​​component provided on the side of the first polar isolation area 111 near the second exhaust area 123 relative to the first clearance hole 161, and will not be described again here.

[0044] Preferably, such as Figures 1 to 4 As shown, the first insulating part 11, the second insulating part 12, and the folded connecting part 13 can be integrated into a flexible injection molded part. In this way, on the one hand, the assembly seams of the cover plate insulation part are reduced, and the overall insulation performance is improved; on the other hand, the first insulating part 11, the second insulating part 12, and the folded connecting part 13 can be manufactured simultaneously in one mold opening, which effectively reduces the manufacturing cost of the cover plate insulation part and facilitates the mass production of the cover plate insulation part.

[0045] Preferably, such as Figures 3 to 5 The thickness of the folded connecting portion 13 is less than the thickness of the first insulating portion 11, and the thickness of the folded connecting portion 13 is less than the thickness of the second insulating portion 12, so as to effectively increase the flexibility and bending flexibility of the folded connecting portion 13 and avoid rigid breakage.

[0046] Optionally, the folding connection 13 can also be a hinge to provide a stable folding axis and ensure the relative rotational accuracy of the first insulating part 11 and the second insulating part 12.

[0047] See Figures 5 to 9 As shown, an embodiment of the second aspect of this application also provides a cover plate structure, including the cover plate body 20, the polarity connection portion, and the cover plate insulating member described in any of the above embodiments. Therefore, it has all the beneficial technical effects of the cover plate insulating member, which will not be repeated here.

[0048] See Figure 1 , Figure 8 , Figure 9As shown, an embodiment of the second aspect of this application also provides a battery, including the aforementioned cover plate body 20, electrode assembly, and cover plate insulating member as described in any of the aforementioned embodiments, or including the aforementioned electrode assembly and cover plate mechanism as described in any of the aforementioned embodiments. Therefore, it possesses all the beneficial technical effects of this cover plate insulating member, which will not be elaborated upon here.

[0049] like Figure 1 As shown, the electrode assembly may include two electrode bodies 30, which are stacked along a third direction F3. The tabs 31 of the two electrode groups extend from both ends of the cover plate insulator in the third direction F3 into the space between the first insulating part 11 and the second insulating part 12. In this way, on the one hand, the design of the tabs 31 extending from both ends avoids mutual interference between the tabs 31 of the two electrode groups during the connection process, ensuring that each tab 31 can be stably connected to the corresponding polarity part, thereby improving the battery energy density. On the other hand, the opening on the side of the cover plate insulator in the third direction F3 provides an independent channel for the tabs 31 of the two electrode groups. At the same time, the isolation effect of the first insulating part 11 and the second insulating part 12 prevents short circuits between the tabs 31 or electrode bodies 30 of the two electrode groups, thus balancing high capacity and high safety.

[0050] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A cover insulation, characterized in that Insulation between the cover body and the electrode assembly of the battery, the electrode assembly including the electrode body and the tabs extending from the electrode body; The cover plate insulation component includes a first insulation portion, a second insulation portion, and a folding connecting portion. When the cover plate insulation component is in the assembled state, the first insulation portion and the second insulation portion are stacked along a first direction. The first insulation portion is attached to the side of the cover plate body facing the electrode assembly. The second insulation portion is disposed between the electrode assembly body and the electrode tab. The folding connecting portion is disposed on one side of the first insulation portion and the second insulation portion in a second direction, and the folding connecting portion connects the first insulation portion and the second insulation portion. The electrode tab can extend from the third-direction side of the cover plate insulator into the space between the first insulating part and the second insulating part and connect with the polar connection part provided on the cover plate body. The third-direction is perpendicular to the second direction, and the first direction is perpendicular to the plane determined by the second direction and the third-direction.

2. The cover insulation of claim 1, wherein, It also includes a snap-fit ​​assembly, which includes a first snap-fit ​​member and a second snap-fit ​​member. The first snap-fit ​​member is provided on the first of the first insulating part and the second insulating part, and the second snap-fit ​​member is provided at the corresponding position of the second of the first insulating part and the second insulating part. The first and second snap-fit ​​components can be snapped together to fix the first insulating part and the second insulating part.

3. The cover insulation of claim 2, wherein, The cover plate body is also provided with an explosion-proof valve, and the polarity connection part includes a first pole and a second pole, and the first pole, the explosion-proof valve and the second pole are spaced apart along the second direction; The first insulating portion is sequentially divided into a first polarity isolation region, a first exhaust region, and a second polarity isolation region along the second direction; The second insulating portion is sequentially divided into a first polarity support region, a second exhaust region, and a second polarity support region along the second direction; The first pole post, the first polarity isolation area, and the first polarity support area are arranged facing each other along the first direction; the explosion-proof valve, the first exhaust area, and the second exhaust area are arranged facing each other along the first direction; the second pole post, the second polarity isolation area, and the second polarity support area are arranged facing each other along the first direction. The first polarity isolation region is provided with a first clearance hole, and the second polarity isolation region is provided with a second clearance hole. At least a portion of the first pole post is exposed by the first clearance hole, and at least a portion of the second pole post is exposed by the second clearance hole.

4. The cover plate insulating component according to claim 3, characterized in that, The second insulating portion has a first end and a second end opposite to each other in the second direction, the first end being connected to the folded connecting portion, and the second end being provided with the snap-fit ​​assembly; And / or, relative to the first clearance hole, the snap-fit ​​component is provided on the side of the first polarity isolation area closer to the second exhaust area; And / or, relative to the second clearance hole, the snap-fit ​​assembly is provided on the side of the second polarity isolation zone closest to the second exhaust zone.

5. The cover insulation of claim 2, wherein, The first snap-fit ​​component is a first variable-diameter snap-fit ​​hole extending along the first direction, and the second snap-fit ​​component is an elastic snap-fit ​​post extending along the first direction; In the first direction, from one end of the first object facing the second object to the other end, the diameter of the first variable diameter card hole gradually decreases; The end of the elastic locking post furthest from the second is provided with a locking protrusion, and the outer diameter of the locking protrusion is greater than the minimum value of the diameter of the first variable diameter locking hole.

6. The cover plate insulating component according to claim 5, characterized in that, The first is the first insulating part, and the second is the second insulating part; The first variable diameter locking hole penetrates the first insulating part, and a second variable diameter locking hole is also provided at the corresponding position of the cover plate body. The elastic locking post can penetrate the first variable diameter locking hole and engage with the second variable diameter locking hole.

7. The cover plate insulation element according to any one of claims 1 to 6, characterized in that, The first insulating part, the second insulating part, and the folded connecting part are integrated into a flexible injection molded part. The thickness of the folded connecting part is less than the thickness of the first insulating part, and the thickness of the folded connecting part is less than the thickness of the second insulating part. Alternatively, the folding connection can be a hinge.

8. A cover structure, characterized by It includes the cover plate body, the polarity connection portion, and the cover plate insulation element according to any one of claims 1 to 7.

9. A battery, characterized by Includes the cover plate body, the pole assembly, and the cover plate insulating member according to any one of claims 1 to 7; Alternatively, it may include the electrode assembly and the cover plate structure of claim 8.

10. The battery of claim 9, wherein, The electrode assembly includes two electrode bodies stacked together along the third direction, and the electrode tabs of the two electrode bodies extend from both ends of the cover plate insulator in the third direction into the space between the first insulating portion and the second insulating portion.

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