Cover plate assembly and electrical equipment

Abstract

This application relates to the field of power battery technology and provides a cover plate assembly and an electrical device. The cover plate assembly includes a cover plate and an insulating member disposed on one side of the cover plate. The cover plate is elongated and has terminals at both ends, each terminal being used to connect to a tab in an electrode assembly. The insulating member includes an insulating portion disposed on one side of the cover plate and protective portions located at both ends of the insulating portion along the length of the cover plate. The protective portions at both ends are connected to the insulating portion through corresponding bends. Each protective portion at both ends can be bent relative to the insulating portion through the corresponding bends, and each bent protective portion can connect to the insulating portion and at least block the corresponding terminal. Each protective portion has a groove, and each groove is recessed along the thickness direction of the cover plate towards the side away from the cover plate. The cover plate assembly of this application can prevent weld slag formed by welding the tabs to the cover plate from piercing the separator in the electrode assembly, which is beneficial to improving the safety and reliability of the power battery.

Description

Technical Field

[0001] This application relates to the field of power battery technology, and in particular to a cover assembly for sealing a battery casing. This application also relates to an electrical device using this cover assembly. Background Technology

[0002] In the battery manufacturing process, the welding of the tabs and the cover plate is one of the key processes, and its welding quality directly affects the safety and performance of the battery.

[0003] In lithium-ion battery structures, the separator is a crucial component for isolating the positive and negative electrodes. If it is punctured by weld slag formed during the welding of the tabs and cover plate, the positive and negative electrodes will come into direct contact, creating a short circuit. The high temperatures generated by this short circuit can trigger a chain reaction within the battery, such as electrolyte decomposition and electrode material decomposition, potentially leading to thermal runaway. Thermal runaway can not only damage the battery but also pose a threat to the surrounding environment and human safety. Utility Model Content

[0004] In view of this, this application aims to provide a cover assembly to improve the safety and reliability of power batteries.

[0005] To achieve the above objectives, the technical solution of this application is implemented as follows: A cover plate assembly includes a cover plate and an insulating member disposed on one side of the cover plate; The cover plate is elongated, and pole posts are inserted at both ends of the cover plate near its own length direction. Each pole post is used to connect with the pole lug in the pole group. The insulating component includes an insulating portion disposed on one side of the cover plate, and protective portions located at both ends of the insulating portion along the length direction of the cover plate, wherein the protective portions at both ends are respectively connected to the insulating portion through bending portions at corresponding ends; The insulating part can insulate each of the pole posts from the cover plate respectively; the protective parts at both ends can be bent relative to the insulating part through the bending part at the corresponding end, and each of the bent protective parts can be connected to the insulating part, and at least block the part on the pole post at the corresponding end where the pole tab is provided; Each of the protective parts is provided with a groove, and each of the grooves is recessed along the thickness direction of the cover plate toward the side away from the cover plate.

[0006] Furthermore, the insulating part, each of the bending parts, and each of the protective parts are integrally formed by injection molding; the insulating part is conformally arranged to the cover plate, and the bending part is located in the middle of the protective part along the width direction of the cover plate.

[0007] Furthermore, along the width direction of the cover plate, the size M2 of the protective part is smaller than the size M1 of the insulating part, and the relationship between the size M3 of the bending part and the size M2 of the protective part is M3 = (0.25-0.6) x M2.

[0008] Furthermore, the bent portion extends along the width direction of the cover plate, and at least one side of the bent portion in the thickness direction is provided with a glue-reducing groove, which extends along the width direction of the cover plate.

[0009] Furthermore, the relationship between the minimum thickness T of the portion on the bent part where the adhesive reduction groove is provided and the thickness T1 of the protective part is T = (1 / 3 - 1 / 2) x T1.

[0010] Furthermore, the thickness of the bent portion and the protective portion are the same, and the cross-sectional shape of the bent portion in the bent state is semi-circular; the bent portion is provided with a first through hole.

[0011] Furthermore, each of the protective parts is provided with a central region corresponding to the electrode tab and an annular region surrounding the central region, and the groove is formed by recessing from the central region toward the side away from the cover plate.

[0012] Furthermore, a second through hole is provided at the connection between the central region and the annular region, and the second through hole is a plurality of holes spaced apart around the central region.

[0013] Furthermore, each of the electrode tabs corresponding to each electrode post consists of two arranged at intervals along the width direction of the cover plate, and the number of the grooves corresponds one-to-one with the number of electrode tabs.

[0014] Compared with the prior art, this application has the following advantages: (1) The cover plate assembly described in this application includes an insulating part and protective parts located at both ends of the insulating part along its length. The protective parts at both ends can be bent relative to the insulating part via corresponding bending parts, and each bent protective part rests on the corresponding end post. This prevents weld slag formed by welding the tabs to the cover plate from piercing the separator in the electrode assembly. When applied to power batteries, this improves the safety and reliability of the power battery. The grooves on each protective part better accommodate weld slag from the tab welding area, further reducing the risk of piercing the separator and improving the safety and reliability of the power battery.

[0015] (2) The insulating part, each bending part and each protective part are injection molded into an integral structure, which facilitates the preparation and molding of the insulating part; and along the width direction of the cover plate, the bending part is located in the middle position between the protective part and the insulating part, which can save the amount of raw materials, reduce the weight of the insulating part, and facilitate the bending operation of the protective part relative to the insulating part.

[0016] (3) The size M2 of the protective part is smaller than the size M1 of the insulating part. This can avoid the bending space of the electrode tab and prevent the short circuit caused by the small gap between the electrode tab and the housing. The limitation of the relationship between the size M3 of the bending part and the size M2 of the protective part is beneficial to the bending of the protective part and improves the convenience of the process and the yield.

[0017] (4) The rubber-reducing groove provided on the bending part is conducive to the smooth bending of the bending part.

[0018] (5) Limiting the thickness of the rubber reduction groove can ensure the connection strength while further facilitating the smooth bending of the bending part.

[0019] (6) The thickness of the bending part and the protective part are the same, and a first through hole is provided on the bending part. The overall strength of the bending part is weakened by the first through hole, which facilitates the smooth bending of the protective part.

[0020] (7) The protective part is provided with a central area and an annular area, and the groove is formed by recessing from the central area to the side away from the cover plate. This facilitates the preparation and molding of the groove and can fully cover the welding part of the electrode ear, thus playing a better protective role.

[0021] (8) A second through hole is provided at the connection between the central region and the annular region. Multiple second through holes are arranged at intervals around the central region. This not only allows the electrolyte to pass through the second through hole, which is beneficial to improving the wetting effect of the electrode sheet, but also makes the groove position elastic by using the connecting ribs between the connected second through holes. In practical applications, the outer side of the groove contacts the electrode assembly surface, which can effectively prevent the electrode assembly from moving inside the battery casing and avoid the risk of short circuit inside the battery caused by the extrusion of the tabs or separator.

[0022] (9) The tabs corresponding to each pole are two arranged at a distance along the width of the cover plate, and the number of grooves matches the number of tabs. This can better adapt to the structure of two pole groups arranged side by side in the battery casing, and is conducive to improving the safety and reliability of this battery structure.

[0023] Another object of this application is to provide an electrical device in which a cover plate assembly as described above is applied to the power battery of the electrical device.

[0024] The electrical equipment described in this application, by employing the aforementioned cover plate assembly, can prevent weld slag formed by the welding of the tabs and the cover plate from piercing the separator in the electrode assembly, thereby improving the safety and reliability of the power battery. Furthermore, by utilizing the grooves provided on each protective part, weld slag at the tab welding location can be better accommodated, further reducing the risk of piercing the separator and improving the performance of the power battery, thus enhancing the reliability of the electrical equipment. 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 and do not constitute an undue limitation of this application. In the drawings: Figure 1 This is a first-view structural schematic diagram of the cover plate assembly described in an embodiment of this application; Figure 2 This is a second-view structural schematic diagram of the cover plate assembly described in an embodiment of this application; Figure 3 This is a schematic diagram of the overall structure of the insulating component described in the embodiments of this application; Figure 4 This is a partial enlarged view of the insulating component described in the embodiments of this application; Figure 5 This is a schematic diagram of the structure of the bent portion described in the embodiment of this application; Figure 6 This is a schematic diagram of a second structure of the cover plate assembly described in an embodiment of this application; Figure 7 This is a schematic diagram of the protective portion of the third structure of the insulating member described in the embodiments of this application in its unfolded state; Figure 8 This is a schematic diagram of the bent state of the protective part of the third structure of the insulating component described in the embodiments of this application; Figure 9 This is a first-view structural schematic diagram of the cover plate assembly in application state according to an embodiment of this application; Figure 10 This is a second-view structural schematic diagram of the cover plate assembly in application state according to an embodiment of this application; Figure 11 This is a third-view structural schematic diagram of the cover plate assembly in application state according to an embodiment of this application. Figure 12 This is a structural schematic diagram from a fourth perspective of the application state of the cover plate assembly described in the embodiments of this application; Figure 13 This is a cross-sectional view of the cover plate assembly in the application state according to an embodiment of this application.

[0026] Explanation of reference numerals in the attached figures: 1. Cover plate; 11. Pole post; 2. Insulating component; 21. Insulating part; 22. Protective part; 23. Bending part; 211. Snap connector; 212. Hot melt column; 221. Groove; 222. Snap hole; 223. Hot melt hole; 2211. Second through hole; 231. Adhesive reduction groove; 3. Electrode group; 31. Electrode ear. Detailed Implementation

[0027] To make the technical solution and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

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

[0029] Furthermore, it should be noted that in the description of this application, if terms such as "upper," "lower," "inner," or "outer" appear, indicating orientation or positional relationship, these are based on the orientation or positional relationship shown in the accompanying drawings and are 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, and therefore should not be construed as a limitation on this application. In addition, if terms such as "first" or "second" appear, they are also used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[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, 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 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] 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.

[0033] An embodiment of the first aspect of this application provides a cover assembly for sealing a battery casing, which helps to improve the safety and reliability of the power battery.

[0034] In the battery manufacturing process, the welding of the tabs and the cover plate is one of the key processes, and its welding quality directly affects the safety and performance of the battery.

[0035] In lithium-ion battery structures, the separator is a key functional component that effectively isolates the positive and negative electrodes. Its material properties and structural integrity are crucial for the safe and stable operation of the battery. Separators are typically made of insulating materials with specific porosity and mechanical strength. Their function is to strictly prevent direct contact between the positive and negative electrodes while ensuring normal ion transport, thereby maintaining the orderly conduct of electrochemical reactions within the battery.

[0036] However, during the welding process of the electrode tab and the cover plate, welding slag is easily generated at the welding site due to factors such as slight fluctuations in welding process parameters (e.g., welding current, welding time, welding pressure), precision deviations of welding equipment, and differences in the skill level of operators. The morphology, size, and distribution of these welding slags are uncertain, and they may exist in the welding area as tiny particles, flakes, or irregular shapes.

[0037] During subsequent assembly, transportation, or use of the battery, if it detaches or shifts due to factors such as minor internal vibrations, stress changes, or external impacts, welding slag is highly likely to cause physical puncture damage to the separator. Once the separator is punctured by welding slag, the isolation between the positive and negative electrodes maintained by the separator will be broken, and the positive and negative electrodes will directly make electrical contact, thus causing a short circuit fault.

[0038] Therefore, to prevent welding slag on the cover plate from puncturing the separator, this embodiment proposes a new cover plate assembly, which improves the safety and reliability of the power battery by optimizing the structure of the insulating components on the cover plate. In the cover plate assembly of this embodiment, combined with... Figures 1 to 5 As shown, the overall structure includes a cover plate 1 and an insulating member 2 disposed on one side of the cover plate 1.

[0039] The cover plate 1 is elongated, and pole posts 11 are inserted at both ends of the cover plate 1 along its length. Each pole post 11 is used to connect with the tabs 31 in the pole group 3. The insulating member 2 includes an insulating part 21 located on one side of the cover plate 1, and protective parts 22 located at both ends of the insulating part 21 along the length of the cover plate 1. The protective parts 22 at both ends are connected to the insulating part 21 through corresponding bends 23. Each protective part 22 is provided with a groove 221, and each groove 221 is recessed along the thickness direction of the cover plate 1 towards the side away from the cover plate 1.

[0040] The insulating part 21 can insulate each pole post 11 from the cover plate 1 respectively, and the protective parts 22 at both ends can be bent relative to the insulating part 21 through the bending part 23 at the corresponding end. After bending, each protective part 22 can be connected to the insulating part 21, and at least block the part on the corresponding pole post 11 where the pole tab 31 is provided.

[0041] Therefore, by providing an insulating component 2 including an insulating portion 21 and protective portions 22 located at both ends of the insulating portion 21 along its length, and by ensuring that the protective portions 22 at both ends can be bent relative to the insulating portion 21 via corresponding bending portions 23, and that each bent protective portion 22 rests on the corresponding end electrode post 11, the weld slag formed by welding the tab 31 to the cover plate 1 can be prevented from piercing the separator in the electrode assembly 3. When applied to a power battery, this improves the safety and reliability of the power battery. The grooves 221 provided on each protective portion 22 can better accommodate the weld slag at the welding point of the tab 31, thereby further reducing the risk of piercing the separator and improving the safety and reliability of the power battery.

[0042] Based on the above overview, specifically, to better understand the cover assembly of this embodiment, the structure of the power battery will be briefly described first. Generally, a power battery includes a battery casing and an electrode assembly 3 located within the battery casing. Structurally, the electrode assembly 3 includes a positive electrode, a negative electrode, and a separator sandwiched between the positive and negative electrode. The battery casing generally includes a casing body with a receiving cavity open on one side. The cover assembly seals the opening and is welded to the battery casing, forming a sealed cavity within which the aforementioned electrode assembly 3 is housed.

[0043] As an exemplary structural form, the cover plate assembly in this embodiment still consists of... Figures 1 to 5It includes a cover plate 1 and an insulating member 2 disposed on one side of the cover plate 1. The insulating member 2 includes an insulating part 21 and protective parts 22 located at both ends along the length of the cover plate 1. The protective parts 22 at both ends are connected to the insulating part 21 through corresponding bending parts 23. Furthermore, the protective parts 22 at both ends can be bent relative to the insulating part 21 through the bending parts 23 at the corresponding ends. Each bent protective part 22 can be connected to the insulating part 21, and each bent protective part 22 can block the welding position between the pole post 11 and the pole tab 31 at the corresponding end.

[0044] Specifically, the bent protective parts 22 and the insulating parts 21 are connected by a snap-fit ​​structure. For example... Figures 2 to 5 As shown, the snap-fit ​​structure includes a snap-fit ​​connector 211 provided on the insulating part 21 and a snap-fit ​​hole 222 provided on the protective part 22. After the protective part 22 is bent, the snap-fit ​​connector 211 can be snapped into the snap-fit ​​hole 222, thereby making the protective part 22 and the insulating part 21 snap-fit ​​connected.

[0045] It is understood that the positions of the snap connector 211 and the snap hole 222 can be interchanged, thereby enabling the snap connection between the protective part 22 and the insulating part 21.

[0046] It is also understandable that, in addition to the snap-fit ​​connection, the bent protective parts 22 and the insulating parts 21 can also be connected by means of... Figure 6 As shown, the bent protective parts 22 and the insulating parts 21 are connected together by a heat-fusion structure. The heat-fusion structure includes heat-fusion pillars 212 provided on the insulating parts 21 and heat-fusion holes 223 provided on the protective parts 22. After the protective parts 22 are bent, the heat-fusion pillars 212 are inserted into the heat-fusion holes 223, and the heat-fusion pillars 212 and the heat-fusion holes 223 are connected together by heat fusion.

[0047] Reference Figures 1 to 5 As shown, in some exemplary embodiments, for example, the insulating portion 21, each bending portion 23 and each protective portion 22 are integrally formed by injection molding, and the insulating portion 21 is disposed conformally to the cover plate 1, and the bending portion 23 is located in the middle of the protective portion 22 along the width direction of the cover plate 1.

[0048] At this time, the insulating part 21, each bending part 23, and each protective part 22 are injection molded into an integral structure, which facilitates the preparation and molding of the insulating part 2. Furthermore, in the width direction of the cover plate 1, the bending part 23 is located in the middle position between the protective part 22 and the insulating part 21, that is, a part of the end of the protective part 22 and a part of the end of the insulating part 21 are connected by the bending part 23. This can save the amount of raw materials used, reduce the weight of the insulating part 2, and also facilitate the bending operation of the protective part 22 relative to the insulating part 21.

[0049] In practice, the insulating part 21 conforms to the rectangular plate structure of the cover plate 1, and the protective parts 22 are located at both ends of the insulating part 21 along its length and are connected by corresponding bends 23. The insulating part 21, each bend 23, and each protective part 22 can all be made of plastic, such as polypropylene (PP). Because polypropylene has excellent electrical insulation and impact resistance, it can not only effectively insulate the cover plate 1 from the pole post 11, but also utilize its excellent elasticity to improve the damping effect of the protective part 22 on the vibration of the pole group 3.

[0050] Reference Figure 3 As shown, in some exemplary embodiments, along the width direction of the cover plate 1, the dimension M2 of the protective portion 22 is smaller than the dimension M1 of the insulating portion 21. This avoids the bending space of the tab 31 and prevents short circuits caused by excessively small gaps between the tab 31 and the housing. Furthermore, the relationship between the dimension M3 of the bending portion 23 and the dimension M2 of the protective portion 22 is M3 = (0.25 - 0.5) x M2. By limiting the relationship between the dimension M3 of the bending portion 23 and the dimension M2 of the protective portion 22, it is beneficial to bend the protective portion 22, thereby improving process convenience and yield.

[0051] In specific implementation, the dimension M2 of the protective part 22 is 2.0mm-6.0mm smaller than the dimension M1 of the insulating part 21, for example, 2.0mm, 2.5mm, 3.0mm, 3.5mm, 4.0mm, 4.5mm, 5.0mm, 5.5mm, or 6mm smaller. The relationship between the dimension M3 of the bending part 23 and the dimension M2 of the protective part 22 is, for example, M3=0.25xM2, M3=0.3xM2, M3=0.35xM2, M3=0.4xM2, M3=0.45xM2, or M3=0.5xM2.

[0052] Combined Figures 2 to 5 As shown, in some exemplary embodiments, the bending portion 23 extends along the width direction of the cover plate 1, and at least one side of the bending portion 23 in the thickness direction is provided with a glue-reducing groove 231, which extends along the width direction of the cover plate 1. The glue-reducing groove 231 provided on the bending portion 23 facilitates the smooth bending of the bending portion 23.

[0053] Reference Figure 4 and Figure 5 As shown, the bending portion 23 extends along the width direction of the cover plate 1, and the adhesive reduction groove 231 is provided on one side of the bending portion 23 and extends along the extension direction of the bending portion 23, which facilitates the smooth bending of the bending portion 23. It can be understood that, in addition, the adhesive reduction groove 231 can be provided only on the other side of the bending portion 23, or the adhesive reduction groove 231 can be provided on both sides of the bending portion 23.

[0054] Based on the setting of the glue reduction groove 231, continue to combine Figure 4 and Figure 5 As shown, in some exemplary embodiments, the minimum thickness T of the portion of the bending part 23 with the adhesive reduction groove 231 is related to the thickness T1 of the protective part 22 as T = (1 / 3 - 1 / 2) x T1. In this case, limiting the thickness of the adhesive reduction groove 231 can ensure the connection strength while further facilitating the smooth bending of the bending part 23.

[0055] In specific implementation, the minimum thickness T of the adhesive reduction groove 231 is set to, for example, 1 / 3 of the thickness T1 of the protective part 22, or 2 / 5 of the thickness T1 of the protective part 22, or 1 / 2 of the thickness T1 of the protective part 22, etc.

[0056] Reference Figure 7 and Figure 8 As shown, in some exemplary embodiments, the bending portion 23 and the protective portion 22 may be of the same thickness, the cross-sectional shape of the bending portion 23 in the bent state is semi-circular, and the bending portion 23 is provided with a first through hole. In specific implementations, for example, the first through hole is elongated, and the long axis of the first through hole extends along the width direction of the cover plate 1. In this case, this structural form can weaken the overall strength of the bending portion 23 at the first through hole, thereby facilitating the smooth bending of the protective portion 22.

[0057] Depend on Figures 1 to 3 and combined Figures 9 to 13 As shown, in some exemplary embodiments, each protective part 22 has, for example, a central region corresponding to the tab 31 and an annular region surrounding the central region. The groove 221 is formed by recessing from the central region toward the side away from the cover plate 1. This facilitates the fabrication and shaping of the groove 221 and can fully cover the welding part of the tab 31, thereby providing better protection. At the same time, the outer surface of the groove 221 can make zero-gap contact with the tab 31, which can also shape and fix the tab 31, prevent the tab 31 from being inserted backwards and shortening the bending space of the tab 31, and improve the space utilization rate in the height direction of the power battery.

[0058] Depend on Figures 1 to 4 and combined Figures 9 to 13As shown, in some exemplary embodiments, a second through hole 2211 is provided at the connection between the central region and the annular region, and multiple second through holes 2211 are spaced apart around the central region. At the connection between the central region and the annular region, i.e., at the bend of the edge of the groove 221, multiple second through holes 2211 are arranged spaced apart along the circumferential edge of the groove 221. It is understood that, in addition to being spaced apart along the circumferential edge of the groove 221, the second through holes 2211 can also be arranged spaced apart only at two opposite edges of the groove 221; such an arrangement is also acceptable.

[0059] In the above structure, a second through hole 2211 is provided at the connection between the central region and the annular region. Multiple second through holes 2211 are arranged at intervals around the central region. This not only allows the electrolyte to pass through the second through holes 2211, which is beneficial to improving the wetting effect of the electrode sheet, but also uses the connecting ribs between the connected second through holes 2211 to make the position of the groove 221 have a certain degree of elasticity. In practical applications, the outer side of the groove 221 contacts the surface of the electrode assembly 3, which can effectively prevent the electrode assembly 3 from moving around in the battery casing and avoid the risk of short circuits inside the battery caused by the tab 31 or the separator being squeezed and damaged.

[0060] Continue to refer to Figures 1 to 4 ,as well as Figures 9 to 13 As shown, in some exemplary embodiments, for example, each tab 31 corresponding to each pole post 11 is arranged in two pairs along the width direction of the cover plate 1, and the number of grooves 221 corresponds one-to-one with the tab 31.

[0061] Specifically, refer to Figure 12 and Figure 13 As shown, the electrode groups 3 housed in the battery casing are arranged in two parallel rows. Each electrode group 3 has two tabs 31, and the tabs 31 at the same end of each electrode group 3 are welded to the corresponding terminal post 11. The number of grooves 221 on the protective part 22 is matched with the number of tabs 31 to provide better protection for the welding connection position between each tab 31 and the terminal post 11.

[0062] In this embodiment, the tabs 31 corresponding to each pole post 11 are arranged in two pairs along the width direction of the cover plate 1, and the number of grooves 221 matches the number of tabs 31. This can better adapt to the structure of two pole groups 3 arranged side by side in the battery casing, and is conducive to improving the safety and reliability of this battery structure.

[0063] It is worth noting that, regarding the cover plate assembly of this embodiment, based on the above exemplary embodiments, in specific implementation, as a preferred embodiment, it is still composed of... Figures 1 to 5 and combined Figures 9 to 13As shown, it includes, for example, a cover plate 1 and an insulating member 2 disposed on one side of the cover plate 1. The cover plate 1 has pole posts 11 at both ends, each pole post 11 being used to connect to the tabs 31 in the pole assembly 3. The insulating member 2 includes an insulating portion 21 disposed on one side of the cover plate 1, and protective portions 22 connected to both ends of the insulating portion 21 along its length.

[0064] The insulating part 21 can insulate each pole post 11 from the cover plate 1. The protective parts 22 at both ends are connected to the insulating part 21 through the corresponding bending parts 23. Both protective parts 22 at both ends can be bent relative to the insulating part 21 through the corresponding bending parts 23. The bent protective parts 22 can be connected to the insulating part 21 to cover the connection between the pole tab 31 and the pole post 11. At the same time, each protective part 22 is provided with a groove 221, and each groove 221 is recessed along the thickness direction of the cover plate 1 towards the side away from the cover plate 1.

[0065] The insulating part 21, each bending part 23, and each protective part 22 are integrally formed by injection molding. The insulating part 21 is conformally provided to the cover plate 1, and in the width direction of the cover plate 1, the bending part 23 is located in the middle between the protective part 22 and the insulating part 21.

[0066] In the width direction of the cover plate 1, the size M2 of the protective part 22 is smaller than the size M1 of the insulating part 21, and the relationship between the size M3 of the bending part 23 and the size M2 of the protective part 22 is M3 = (0.25-0.6) x M2.

[0067] The bending portion 23 extends along the width direction of the cover plate 1, and a glue-reducing groove 231 is provided on one side of the bending portion 23 in the thickness direction, and the glue-reducing groove 231 extends along the width direction of the cover plate 1. Furthermore, the minimum thickness T of the part of the bending portion 23 with the glue-reducing groove 231 and the thickness T1 of the protective portion 22 are related as T = (1 / 3 - 1 / 2) x T1.

[0068] Each protective section 22 has a central region corresponding to the tab 31, and an annular region surrounding the central region. A groove 221 is formed by recessing from the central region towards the side away from the cover plate 1. Furthermore, a second through hole 2211 is provided at the connection between the central region and the annular region, and multiple second through holes 2211 are spaced apart around the central region. Moreover, each tab 31 corresponding to each pole post 11 is arranged in pairs along the width direction of the cover plate 1, and the number of grooves 221 corresponds one-to-one with the number of tabs 31.

[0069] In the preferred embodiment of the above cover plate assembly, the connection method between the protective part 22 and the insulating part 21, the size, shape and position of the bending part 23, the setting and size limitation of the adhesive reduction groove 231, and the structural form of the protective part 22 and the specific setting and arrangement of the groove 221, etc., can still refer to the description in the above exemplary embodiments. Furthermore, in this preferred embodiment, the connection method between the protective part 22 and the insulating part 21, the size, shape and position of the bending part 23, the setting and size limitation of the adhesive reduction groove 231, and the structural form of the protective part 22 and the specific setting and arrangement of the groove 221, etc., based on the beneficial effects brought about by their design, can also refer to the description in the above exemplary embodiments.

[0070] The cover plate assembly of this embodiment, with the above design, can prevent the weld slag formed by the welding of the tabs 31 and the cover plate 1 from piercing the separator in the electrode assembly 3. When applied to a power battery, it can improve the safety and reliability of the power battery. The grooves 221 provided on each protective part 22 can better accommodate the weld slag at the welding part of the tabs 31, thereby further reducing the risk of piercing the separator and improving the safety and reliability of the power battery.

[0071] An embodiment of the second aspect of this application provides an electrical device in which the aforementioned cover assembly is applied to the power battery.

[0072] It is worth noting that electrical equipment can include vehicles, portable devices, ships, spacecraft, and electric toys, etc. Vehicles can be gasoline-powered cars, natural gas-powered cars, or new energy vehicles; new energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. Portable devices can be, for example, unmanned logistics vehicles, etc. Spacecraft include airplanes, rockets, space shuttles, and spacecraft, etc. Electric toys include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. This embodiment does not impose any special limitations on the above-mentioned electrical devices.

[0073] The electrical equipment of this embodiment, by adopting the above-mentioned cover plate assembly, can prevent the weld slag formed by the welding of the tab 31 and the cover plate 1 from piercing the separator in the electrode group 3, thereby improving the safety and reliability of the power battery. Furthermore, by utilizing the grooves 221 provided on each protective part 22, the weld slag at the welding part of the tab 31 can be better accommodated, further reducing the risk of piercing the separator and improving the performance of the power battery, thereby enhancing the reliability of the electrical equipment.

[0074] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A cover plate assembly, characterized in that: Includes a cover plate and an insulating component disposed on one side of the cover plate; The cover plate is elongated, and pole posts are inserted at both ends of the cover plate near its own length direction. Each pole post is used to connect with the pole lug in the pole group. The insulating component includes an insulating portion disposed on one side of the cover plate, and protective portions located at both ends of the insulating portion along the length direction of the cover plate, wherein the protective portions at both ends are respectively connected to the insulating portion through bending portions at corresponding ends; The insulating part can insulate each of the pole posts from the cover plate respectively; the protective parts at both ends can be bent relative to the insulating part through the bending part at the corresponding end, and each of the bent protective parts can be connected to the insulating part, and at least block the part on the pole post at the corresponding end where the pole tab is provided; Each of the protective parts is provided with a groove, and each of the grooves is recessed along the thickness direction of the cover plate toward the side away from the cover plate.

2. The cover plate assembly according to claim 1, characterized in that: The insulating part, each of the bending parts, and each of the protective parts are integrally formed by injection molding. The insulating part is shaped to conform to the cover plate, and the bent part is located in the middle of the protective part along the width direction of the cover plate.

3. The cover plate assembly according to claim 2, characterized in that: Along the width direction of the cover plate, the size M2 of the protective part is smaller than the size M1 of the insulating part, and the relationship between the size M3 of the bending part and the size M2 of the protective part is M3 = (0.25-0.6) x M2.

4. The cover plate assembly according to claim 2, characterized in that: The bent portion extends along the width direction of the cover plate, and at least one side of the bent portion in the thickness direction is provided with a glue-reducing groove, which extends along the width direction of the cover plate.

5. The cover plate assembly according to claim 4, characterized in that: The relationship between the minimum thickness T of the part with the adhesive reduction groove on the bent part and the thickness T1 of the protective part is T = (1 / 3 - 1 / 2) x T1.

6. The cover plate assembly according to claim 2, characterized in that: The thickness of the bent portion and the protective portion are the same, and the cross-sectional shape of the bent portion in the bent state is semi-circular; The bent portion is provided with a first through hole.

7. The cover plate assembly according to any one of claims 1-6, characterized in that: Each of the protective parts is provided with a central region corresponding to the electrode tab and an annular region surrounding the central region. The groove is formed by recessing from the central region toward the side away from the cover plate.

8. The cover plate assembly according to claim 7, characterized in that: The connection between the central region and the annular region is provided with a second through hole, which is a plurality of holes spaced apart around the central region.

9. The cover plate assembly according to claim 7, characterized in that: Each of the electrode tabs corresponding to each electrode post consists of two arranged at intervals along the width direction of the cover plate, and the number of the grooves corresponds one-to-one with the number of electrode tabs.

10. An electrical appliance, characterized in that: The power battery of the electrical equipment is equipped with a cover plate assembly as described in any one of claims 1-9.

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