Cover plate structure and battery

Abstract

This application relates to the field of battery technology and provides a cover plate structure and a battery. The cover plate structure includes a cover plate and a lead-out electrode assembly disposed on the cover plate. The lead-out electrode assembly includes an electrode post extending through the cover plate along its height direction, and a connecting piece connected to the bottom of the electrode post. A groove is provided at the bottom of the cover plate. The connecting piece has a first connecting section connected to the electrode post, and a second connecting section located above the first connecting section along the height direction of the cover plate. The second connecting section is located within the groove and is used to connect to the electrode assembly. Compared with conventional technologies, the cover plate structure of this application can reduce the overall size of the electrode post, connecting piece, and electrode tab along the height direction of the cover plate after they are assembled, improving the space utilization rate of the cover plate in its own height direction. This relatively increases the space available for the electrode assembly and other components inside the battery, thereby improving the internal space utilization rate of the battery.

Description

Technical Field

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

[0002] In related technologies, a battery typically includes a casing and a cover plate disposed on the casing, which seals the casing. The cover plate usually has a lead-out electrode assembly for achieving electrical connection. This lead-out electrode assembly includes a terminal post extending through the cover plate, a riveting block at the top of the terminal post, and a connecting piece at the bottom of the terminal post. The terminal post is connected to the tabs of the electrode assembly in the battery via the connecting piece.

[0003] In the specific structure of the cover plate, the upper surface of the connecting piece is usually welded to the lower surface of the terminal post. Then, during the battery assembly process, the upper surface of the bent electrode tab is welded to the lower surface of the connecting piece, thereby realizing the separate connection of the connecting piece to the terminal post and the electrode assembly.

[0004] However, arranging the rivet blocks, terminals, connecting pieces, and bent tabs sequentially along the height of the battery results in a large space occupied from the upper surface of the rivet blocks (or terminals) to the lower surface of the connecting pieces in the cover plate. This means that the cover plate occupies a large space in the height direction of the battery, which is not conducive to improving the internal space utilization of the battery and thus affects the improvement of the battery energy density. Utility Model Content

[0005] In view of this, this application aims to propose a cover structure that is conducive to improving the space utilization rate inside the battery.

[0006] To achieve the above objectives, the technical solution of this application is implemented as follows:

[0007] A cover plate structure includes a cover plate and a lead-out electrode assembly disposed on the cover plate;

[0008] The lead-out electrode assembly includes an electrode post that extends through the cover plate along the height direction of the cover plate, and a connecting piece connected to the bottom of the electrode post, the connecting piece being located below the cover plate;

[0009] The bottom of the cover plate is provided with a groove, and a protrusion corresponding to the groove is formed on the top of the cover plate, and the distance between the protrusion and the pole post is set.

[0010] The connecting piece has a first connecting section connected to the pole post, and a second connecting section located above the first connecting section along the height direction of the cover plate. The second connecting section is located in the groove and is used to connect to the pole group.

[0011] Furthermore, the lead-out electrode assembly includes a riveting block, the top of the electrode post is riveted to the riveting block, the protrusion is spaced apart from the riveting block, and an upper insulating member is provided between the riveting block and the cover plate.

[0012] Furthermore, along the length direction of the cover plate, the protrusion is located on the side of the rivet block closer to the center of the cover plate; along the height direction of the cover plate, the distance A between the top wall of the rivet block and the top wall of the cover plate and the distance a between the top wall of the protrusion and the top wall of the cover plate satisfy the following condition: 0.2≤a / A≤2.5.

[0013] Furthermore, along the width direction of the cover plate, the protrusion is located on one side of the rivet block; along the height direction of the cover plate, the distance A between the top wall of the rivet block and the top wall of the cover plate and the distance a between the top wall of the protrusion and the top wall of the cover plate satisfy the following condition: 0.2≤a / A≤1.

[0014] Furthermore, along the width direction of the cover plate, at least one of the protrusions is provided on both sides of the riveting block; the connecting piece is a plurality of pieces corresponding one-to-one with each of the protrusions.

[0015] Furthermore, the distance B between the rivet block and the protrusion satisfies: B≥3mm.

[0016] Furthermore, along the height direction of the cover plate, the wall thickness t1 of the protrusion and the thickness t2 of the cover plate satisfy the following condition: 0.8mm < t1 < t2.

[0017] Furthermore, the first connecting segment and the second connecting segment are arranged in parallel, and the second connecting segment and the first connecting segment are connected by a transition segment; the included angle α between the transition segment and the first connecting segment satisfies: 15°≤α≤90°, and / or, the first connecting segment, the second connecting segment and the transition segment are integrally formed.

[0018] Furthermore, along the height direction of the cover plate, the distance C between the edge of the projected outline of the protrusion and the edge of the projected outline of the cover plate satisfies: C≥3mm.

[0019] Compared with related technologies, this application has the following advantages:

[0020] (1) The cover plate structure described in this application, by setting a groove at the bottom of the base plate and setting the second connecting section of the connecting piece connected to the electrode group in the groove, compared with the conventional technology of welding the upper surface of the connecting piece to the lower surface of the electrode post and welding the upper surface of the bent electrode tab to the lower surface of the connecting piece, reduces the total size of the electrode post, connecting piece and electrode tab along the height direction after they are assembled, improves the space utilization rate of the cover plate in its own height direction, and for the battery assembly equipped with this cover plate structure, it can increase the space for setting other components such as the electrode group inside the battery, improve the space utilization rate inside the battery, and thus help improve the overall energy density of the battery. At the same time, the distance between the protrusion and the electrode post is also the distance between the groove and the electrode post, which can ensure the reliability of setting the second connecting section in the groove and connecting it to the electrode tab of the electrode group.

[0021] (2) The top of the pole is riveted together with the rivet block, which facilitates the assembly of the pole on the cover plate. At the same time, the rivet block can also realize the electrical connection between the pole and the external busbar. Furthermore, by setting the upper insulating part, the rivet block, pole and cover plate can be guaranteed to have good insulation, sealing and installation stability.

[0022] (3) The protrusion is located on the side of the rivet block near the center of the cover plate along the length of the cover plate, and the distance A between the top wall of the rivet block and the top wall of the cover plate along the height of the cover plate satisfies: 0.2≤a / A≤2.5. This avoids the effect of a / A being too small, which would limit the improvement of the internal space utilization of the battery. At the same time, it also avoids the total size of the cover plate in the height direction being too large, which would result in a large total size of the battery in the height direction.

[0023] (4) The protrusion is located on one side of the rivet block along the width direction of the cover plate, and the distance A between the top wall of the rivet block and the top wall of the cover plate along the height direction of the cover plate satisfies: 0.2≤a / A≤1. This avoids the effect of a / A being too small, which would limit the improvement of the internal space utilization of the battery. At the same time, it also avoids the effect of a / A being too large, which would affect the welding of the busbar to the terminal post or the rivet block.

[0024] (5) The rivet block has at least one protrusion on both sides along the width direction of the cover plate, and the connecting piece is a plurality of pieces corresponding to each protrusion, so that the cover plate structure is suitable for multi-pole batteries, especially for batteries with an even number of pole groups.

[0025] (6) The distance B between the rivet block and the protrusion shall meet the following condition: B≥3mm, which can avoid the deformation of the upper insulating part caused by the distance B being too small, thus affecting the assembly of the rivet block.

[0026] (7) Along the height direction of the cover plate, the wall thickness t1 of the protrusion and the thickness t2 of the cover plate should satisfy: 0.8mm < t1 < t2. This can prevent the wall thickness t1 of the protrusion from being too small and having insufficient strength, making it easy to deform, and can also prevent the wall thickness t1 of the protrusion from being too large and unable to be formed.

[0027] (8) The second connecting segment and the first connecting segment are connected by a transition segment, and the included angle α between the transition segment and the first connecting segment satisfies: 15°≤α≤90°. This avoids the included angle α being too small, which would result in a long transition segment and affect the rationality of the protrusion size design. At the same time, it also avoids the included angle α being too large, which would make it difficult to form the connecting piece. Furthermore, the first connecting segment, the second connecting segment and the transition segment are integrally formed. Compared with connection methods such as welding and riveting, this can reduce failure points, ensure the conductivity of the connecting piece, and help reduce costs.

[0028] (9) Along the height direction of the cover plate, the distance C between the edge of the projection contour of the protrusion and the edge of the projection contour of the cover plate should satisfy: C≥3mm. This can avoid the distance C being too small, which would cause large edge deformation during the stamping of the cover plate and affect the reliability of the subsequent shell and cover welding process.

[0029] This application also proposes a battery having a cover structure as described above.

[0030] The battery described in this application has the aforementioned cover structure, which has the same beneficial effects as conventional technology, and will not be elaborated further here. Attached Figure Description

[0031] 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:

[0032] Figure 1 This is a schematic diagram of the conventional cover plate structure described in the embodiments of this application;

[0033] Figure 2 This is a schematic diagram of the structure of a conventional battery as described in an embodiment of this application;

[0034] Figure 3 This is a schematic diagram of one of the cover plate structures described in the embodiments of this application;

[0035] Figure 4 for Figure 3 Top view of the structure shown;

[0036] Figure 5 for Figure 4 Sectional view along the DD direction;

[0037] Figure 6 for Figure 5 Enlarged view of point B in the middle;

[0038] Figure 7 This is a schematic diagram of the structure of a battery according to an embodiment of this application;

[0039] Figure 8 This is another structural schematic diagram of the cover plate structure described in the embodiments of this application;

[0040] Figure 9 for Figure 8 Top view of the structure shown;

[0041] Figure 10 for Figure 9 A sectional view along the EE direction;

[0042] Figure 11 This is another structural schematic diagram of the battery described in an embodiment of this application;

[0043] Explanation of reference numerals in the attached figures:

[0044] 100. Cover plate; 101. Groove; 102. Protrusion;

[0045] 200. Lead-out electrode assembly; 201. Pole post; 202. Connecting piece; 2021. First connecting section; 2022. Second connecting section; 2023. Transition section; 203. Riveting block;

[0046] 300, Electrode Group; 301, Electrode Sheet;

[0047] 400, Housing; 500, Upper Insulating Component; 600, Lower Plastic Component;

[0048] a. The distance between the top wall of the protrusion and the top wall of the cover plate; A. The distance between the top wall of the rivet block and the top wall of the cover plate; B. The distance between the rivet block and the protrusion; C. The distance between the edge of the projected outline of the protrusion and the edge of the projected outline of the cover plate; α. The angle between the transition section and the first connecting section; t1. The wall thickness of the protrusion; t2. The thickness of the cover plate. Detailed Implementation

[0049] 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.

[0050] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other.

[0051] 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.

[0052] 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.

[0053] 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.

[0054] 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.

[0055] An embodiment of the first aspect of this application provides a cover structure that can improve the space utilization inside the battery, thereby facilitating the improvement of the overall energy density of the battery.

[0056] In related technologies, such as Figure 1 and Figure 2 As shown, a battery typically includes a housing 400 and a cover plate 100 disposed on the housing 400, which covers the housing 400. The cover plate 100 typically has a lead-out electrode assembly 200 for electrical connection. This lead-out electrode assembly 200 includes a terminal post 201 penetrating the cover plate 100, a riveting block 203 at the top of the terminal post 201, and a connecting piece 202 at the bottom of the terminal post 201. The terminal post 201 is connected and conductively connected to the tabs 301 of the electrode assembly 300 in the battery via the connecting piece 202.

[0057] In the specific structure of the cover plate 100, the upper surface of the connecting piece 202 is usually welded to the lower surface of the pole post 201. Then, during the battery assembly process, the upper surface of the bent tab 301 is welded to the lower surface of the connecting piece 202, thereby realizing the separate connection of the connecting piece 202 with the pole post 201 and the pole group 300.

[0058] However, arranging the rivet block 203, the terminal post 201, the connecting piece 202, and the bent tab 301 sequentially along the height of the battery results in a large space occupied from the upper surface of the rivet block 203 (or the terminal post 201) to the lower surface of the connecting piece 202 in the cover plate 100. This means that the cover plate 100 occupies a large space in the height direction of the battery, which is not conducive to improving the space utilization rate inside the battery and thus affects the improvement of the battery energy density.

[0059] In view of this, in order to overcome the shortcomings of the related technology, the cover plate structure of this embodiment combines... Figures 3 to 11 As shown, the overall design includes a cover plate 100 and a lead-out electrode assembly 200 disposed on the cover plate 100.

[0060] The lead-out electrode assembly 200 includes an electrode post 201 extending through the cover plate 100 along its height direction, and a connecting piece 202 connected to the bottom of the electrode post 201, with the connecting piece 202 located below the cover plate 100. The bottom of the cover plate 100 has a groove 101, and the top of the cover plate 100 has a corresponding protrusion 102, with the protrusion 102 spaced apart from the electrode post 201. Furthermore, the connecting piece 202 has a first connecting section 2021 connected to the electrode post 201, and a second connecting section 2022 located above and to the side of the first connecting section 2021 along the height direction of the cover plate 100. The second connecting section 2022 is located within the groove 101 and is used to connect to the electrode group 300.

[0061] Therefore, by providing a groove 101 at the bottom of the base plate, and placing the second connecting segment 2022 of the connecting piece 202 connected to the pole assembly 300 within the groove 101, compared to the conventional method of welding the upper surface of the connecting piece 202 to the lower surface of the pole post 201, and welding the upper surface of the bent pole lug 301 to the lower surface of the connecting piece 202, the overall dimension of the pole post 201, connecting piece 202, and pole lug 301 along the height direction of the cover plate 100 after assembly is reduced, thus improving the cover plate's height. The plate 100 has a high space utilization rate in its height direction, and for the battery as a whole equipped with the cover plate structure, it can increase the space for setting other components such as the electrode group 300 inside the battery, improve the space utilization rate inside the battery, and thus help improve the overall energy density of the battery. At the same time, the distance between the protrusion 102 and the electrode post 201 is set so that the distance between the groove 101 and the electrode post 201 is set, which can ensure the reliability of setting the second connecting section 2022 in the groove 101 and connecting it to the electrode tab 301 of the electrode group 300.

[0062] Based on the above general introduction, specifically, in some of the exemplary implementations, the following will be combined with... Figures 1 to 11 As shown, the battery also includes a housing 400 welded to the cover structure, and a lower insulating member disposed between the cover structure and the housing 400 to ensure the insulation between the two and the overall sealing of the battery, and the lower insulating member is preferably disposed at the bottom of the cover 100.

[0063] Furthermore, in this embodiment, the top of the terminal post 201 is typically welded to the external busbar of the battery. Simultaneously, the riveting block 203 can be a conductive component. When the riveting block 203 is conductive, the terminal post 201 is welded to the external busbar of the battery via the riveting block 203. In this embodiment, the connecting piece 202 is preferably integrally formed with the terminal post 201, and this connecting piece 202 can also be referred to as the terminal post base plate. In this embodiment, the second connecting segment 2022 is preferably arranged parallel to the first connecting segment 2021 to facilitate its connection to the tab 301 and its arrangement in the groove 101.

[0064] Furthermore, in this embodiment, the groove 101 (i.e., the protrusion 102) is preferably formed by a portion of the cover plate 100 protruding upwards. In this embodiment, the electrode post 201 can be either a negative electrode post or a positive electrode post, and the electrode tab 301 can be either a negative electrode tab or a positive electrode tab. Specifically, the cover plate structure of this embodiment has two lead-out electrode assemblies 200, namely a negative lead-out electrode assembly corresponding to the negative electrode post and negative electrode tab, and a positive lead-out electrode assembly corresponding to the positive electrode post and positive electrode tab.

[0065] It should be noted that the direction-related descriptions in this embodiment are merely illustrative examples. In actual implementation, the direction descriptions in this embodiment vary depending on the orientation of the cover plate 100. That is, each direction in this embodiment refers to a relative coordinate system with the cover plate 100 as the reference, and each direction of the cover plate 100 is consistent with the direction of the battery formed by the cover plate 100 and the casing 400. For example, the directional terms used in this embodiment, such as "up," "down," "left," "right," "front," and "back," are defined based on the up-down direction (also known as the height direction or battery height direction), the left-right direction (also known as the width direction or battery width direction), and the front-back direction (also known as the length direction or battery length direction) of the cover plate 100. "Top" and "bottom" are defined based on the height direction of the cover plate 100.

[0066] Continue to combine Figures 3 to 7 As shown, in some exemplary embodiments, the lead-out pole assembly 200 includes a riveting block 203, the top of the pole post 201 is riveted to the riveting block 203, the protrusion 102 is spaced apart from the riveting block 203, and an upper insulating member 500 is provided between the riveting block 203 and the cover plate 100.

[0067] Understandably, the top of the pole 201 is riveted to the rivet block 203, which facilitates the assembly of the pole 201 on the cover plate 100. Simultaneously, the rivet block 203 enables electrical connection between the pole 201 and the external busbar. Furthermore, the inclusion of the upper insulating component 500 ensures good insulation, sealing, and installation stability between the rivet block 203, the pole 201, and the cover plate 100.

[0068] It should be mentioned that the specific structural design and materials used for the upper insulating component 500 and the lower insulating component can be referred to relevant structures known to those skilled in the art. For example, the upper insulating component 500 is a common upper plastic and the lower insulating component is a common lower plastic, which will not be elaborated here.

[0069] Still combined Figures 5 to 6 As shown, in some exemplary embodiments, along the length of the cover plate 100, the protrusion 102 is located on the side of the riveting block 203 near the center of the cover plate 100. Furthermore, along the height direction of the cover plate 100, the distance A between the top wall of the riveting block 203 and the top wall of the cover plate 100 satisfies the following condition: 0.2 ≤ a / A ≤ 2.5.

[0070] The main advantage of this setting is that it avoids the limited effect of improving the utilization rate of the battery's internal space due to an excessively small a / A ratio, while also avoiding the large overall dimension of the cover plate 100 in the height direction due to an excessively large a / A ratio, thereby preventing the battery equipped with this cover plate structure from having a large overall dimension in the height direction.

[0071] In other words, satisfying 0.2≤a / A≤2.5 ensures that the space of the cover plate 100 in its height direction is utilized relatively optimally. For the battery as a whole equipped with this cover plate structure, it can maximize the space for setting other components such as the electrode group 300 inside the battery, effectively improve the space utilization rate inside the battery, and thus help improve the overall energy density of the battery.

[0072] In specific implementation, the aforementioned a / A value can be 0.2, 0.5, 1.0, 1.5, 2.0, or 2.5, etc., to achieve a better improvement in the utilization of the battery's internal space. Furthermore, along the length of the cover plate 100, when the protrusion 102 is located on the side of the riveting block 203 near the center of the cover plate 100, along the height direction of the cover plate 100, the second connecting segment 2022 is located above the side of the first connecting segment 2021 near the center of the cover plate 100.

[0073] In this embodiment, besides positioning the protrusion 102 on one side of the rivet block 203 along the length of the cover plate 100, other structural designs can also be adopted, such as combining... Figures 8 to 11 As shown, in some exemplary embodiments, the protrusion 102 is located on one side of the rivet block 203 along the width direction of the cover plate 100. Furthermore, along the height direction of the cover plate 100, the distance A between the top wall of the rivet block 203 and the top wall of the cover plate 100 satisfies the following condition: 0.2 ≤ a / A ≤ 1.

[0074] The main advantage of this setting is that it avoids the limited effect of improving the utilization of the battery's internal space due to an excessively small a / A ratio, while also preventing the a / A ratio from being too large and affecting the welding of the busbar to the terminal 201 or the rivet block 203.

[0075] In other words, satisfying 0.2≤a / A≤1 ensures that the space of the cover plate 100 in its height direction is utilized relatively optimally. For the battery assembly equipped with this cover plate structure, it can maximize the space for other components such as the electrode group 300 inside the battery without affecting the welding of the busbar and the terminal post 201 or the riveting block 203, effectively improving the space utilization rate inside the battery, and thus contributing to the improvement of the overall energy density of the battery.

[0076] In specific implementation, the aforementioned a / A value can be 0.2, 0.5, 0.7, or 1.0, etc., to achieve a better improvement in the utilization of the battery's internal space. Furthermore, along the width direction of the cover plate 100, when the protrusion 102 is located on one side of the riveting block 203, along the height direction of the cover plate 100, the second connecting segment 2022 is located above the first connecting segment 2021, and along the width direction of the cover plate 100, the second connecting segment 2022 is located on one side of the first connecting segment 2021.

[0077] In some exemplary embodiments, at least one protrusion 102 is provided on both sides of the riveting block 203 along the width direction of the cover plate 100. Furthermore, there are multiple connecting pieces 202 corresponding to each protrusion 102.

[0078] By providing at least one protrusion 102 on each side of the riveting block 203 along the width direction of the cover plate 100, and by having multiple connecting pieces 202 corresponding one-to-one with each protrusion 102, this cover plate structure can be adapted to batteries with multi-pole groups 300, especially batteries with an even number of pole groups 300. For example... Figure 11 As shown, there are two pole groups 300. The number of protrusions 102 and connecting pieces 202 are both two located on the riveting block 203 along the width direction of the cover plate 100, and both connecting pieces 202 are integrally formed with the pole post 201.

[0079] In addition, continue to combine Figures 4 to 6 ,as well as Figures 9 to 11 As shown, in some exemplary embodiments, the distance B between the riveting block 203 and the protrusion 102 satisfies: B ≥ 3 mm. This distance B refers to the spacing between the riveting block 203 and the protrusion 102 within the plane formed by the length and width directions of the cover plate 100. The distance B is ensured to satisfy: B ≥ 3 mm, and can specifically be, for example, 3 mm, 5 mm, or 7 mm. This prevents the distance B from being too small, which could cause deformation of the upper insulating member 500 and affect the assembly of the riveting block 203.

[0080] Furthermore, in some exemplary embodiments, along the height direction of the cover plate 100, the wall thickness t1 of the protrusion 102 and the thickness t2 of the cover plate 100 satisfy the following condition: 0.8 mm < t1 < t2. The advantage of this arrangement is that it avoids the protrusion 102 having insufficient strength and being prone to deformation due to an excessively small wall thickness t1, and also avoids the protrusion 102 having an excessively large wall thickness t1 that would prevent it from being formed. Moreover, the specific value of the cover plate 100 thickness t2 can be referenced to the thickness of the cover plate 100 in prismatic batteries well known to those skilled in the art, and the specific value of the protrusion 102 wall thickness t1 can be, for example, 0.8 mm or t2, etc.

[0081] In addition, continue to combine Figure 6and Figure 10 As shown in the diagram, as mentioned above, the first connecting segment 2021 and the second connecting segment 2022 are arranged in parallel. In some exemplary embodiments, the second connecting segment 2022 and the first connecting segment 2021 are connected by a transition segment 2023. The transition segment 2023 is inclined relative to the first connecting segment 2021, and the included angle α between the transition segment 2023 and the first connecting segment 2021 satisfies the condition: 15°≤α≤90°, and can specifically take values ​​such as 15°, 30°, 45°, 60°, or 90°. This avoids the included angle α being too small, resulting in a long transition segment 2023 and affecting the rationality of the protrusion 102's size design. Simultaneously, it avoids the included angle α being too large, causing difficulties in forming the connecting piece 202, thus resulting in a better forming effect for the connecting piece 202.

[0082] Meanwhile, in some exemplary embodiments, the first connecting segment 2021, the second connecting segment 2022, and the transition segment 2023 are integrally formed. That is, the connecting piece 202 is bent upward to form the second connecting segment 2022, and the second connecting segment 2022 extends into the groove 101. The main advantage of this arrangement is that, compared with connection methods such as welding and riveting, it can reduce the failure points of the connecting piece 202, ensure the conductivity of the connecting piece 202, and help reduce costs.

[0083] In addition, continue to combine Figure 4 and Figure 10 As shown, in some exemplary embodiments, the distance C between the edge of the projected outline of the protrusion 102 and the edge of the projected outline of the cover 100 along the height direction of the cover 100 satisfies: C ≥ 3 mm, and can specifically be 3 mm, 5 mm, or 7 mm, for example. This avoids the distance C being too small, which would cause significant edge deformation during the stamping of the cover 100, affecting the reliability of subsequent cover welding processes.

[0084] It is worth noting that, regarding the cover plate structure of this embodiment, based on the above exemplary embodiments, in specific implementation, as a preferred embodiment, it is still composed of... Figures 3 to 7 As shown, it includes a cover plate 100 and a lead-out electrode assembly 200 disposed on the cover plate 100.

[0085] The lead-out electrode assembly 200 includes an electrode post 201 extending through the cover plate 100 along its height direction, and a connecting piece 202 connected to the bottom of the electrode post 201. The connecting piece 202 is located below the cover plate 100. The bottom of the cover plate 100 is provided with a groove 101, and a protrusion 102 corresponding to the groove 101 is formed on the top of the cover plate 100. The protrusion 102 is spaced apart from the electrode post 201. The connecting piece 202 has a first connecting section 2021 connected to the electrode post 201, and a second connecting section 2022 located above the first connecting section 2021 along the height direction of the cover plate 100. The second connecting section 2022 is located in the groove 101 and is used to connect to the electrode group 300.

[0086] The lead-out electrode assembly 200 includes a riveting block 203 and an upper insulating member 500. The top of the pole post 201 is riveted to the riveting block 203. The upper insulating member 500 is located between the riveting block 203 and the cover plate 100, and the protrusion 102 is spaced apart from the riveting block 203.

[0087] Wherein, along the length direction of the cover plate 100, the protrusion 102 is located on one side of the rivet block 203; along the height direction of the cover plate 100, the distance A between the top wall of the rivet block 203 and the top wall of the cover plate 100 and the distance a between the top wall of the protrusion 102 and the top wall of the cover plate 100 satisfy the following condition: 0.2≤a / A≤2.5.

[0088] The distance B between the rivet block 203 and the protrusion 102 satisfies: B≥3mm.

[0089] Among them, along the height direction of the cover plate 100, the wall thickness t1 of the protrusion 102 and the thickness t2 of the cover plate 100 satisfy the following condition: 0.8mm < t1 < t2.

[0090] The second connecting segment 2022 and the first connecting segment 2021 are connected by a transition segment 2023;

[0091] The included angle α between the transition segment 2023 and the first connecting segment 2021 satisfies: 15°≤α≤90°, and / or the first connecting segment 2021, the second connecting segment 2022 and the transition segment 2023 are integrally formed.

[0092] Wherein, along the height direction of the cover plate 100, the distance C between the edge of the projected outline of the protrusion 102 and the edge of the projected outline of the cover plate 100 satisfies: C≥3mm.

[0093] In the above preferred embodiments, the specific configuration and arrangement of the cover plate 100, groove 101, protrusion 102, lead-out electrode assembly 200, electrode post 201, connecting piece 202, electrode group 300, electrode ear 301, housing 400, upper insulating member 500 and lower plastic member 600 can still be referred to the descriptions in the above exemplary embodiments. Furthermore, in this preferred embodiment, the beneficial effects brought about by the design of the cover plate 100, groove 101, protrusion 102, lead-out electrode assembly 200, electrode post 201, connecting piece 202, electrode group 300, electrode ear 301, housing 400, upper insulating member 500 and lower plastic member 600 can also be referred to the descriptions in the above exemplary embodiments.

[0094] The cover plate structure of this embodiment adopts the above design. By setting a groove 101 at the bottom of the base plate, the second connecting segment 2022 connected to the electrode group 300 in the connecting piece 202 is set in the groove 101. Compared with the conventional technology of welding the upper surface of the connecting piece 202 to the lower surface of the electrode post 201 and welding the upper surface of the bent electrode tab 301 to the lower surface of the connecting piece 202, the overall size of the electrode post 201, the connecting piece 202 and the electrode tab 301 along the height direction of the cover plate 100 after they are assembled is reduced, the space utilization rate of the cover plate 100 in its own height direction is improved, and for the battery assembly equipped with this cover plate structure, the space for setting other components such as the electrode group 300 inside the battery can be increased, the space utilization rate inside the battery can be improved, and thus the overall energy density of the battery can be improved.

[0095] Furthermore, regarding the cover plate structure of this embodiment, based on the above exemplary embodiments, in specific implementation, as another preferred embodiment, it is still composed of... Figures 8 to 11 As shown, it includes a cover plate 100 and a lead-out electrode assembly 200 disposed on the cover plate 100.

[0096] The lead-out electrode assembly 200 includes an electrode post 201 extending through the cover plate 100 along its height direction, and a connecting piece 202 connected to the bottom of the electrode post 201. The connecting piece 202 is located below the cover plate 100. The bottom of the cover plate 100 is provided with a groove 101, and a protrusion 102 corresponding to the groove 101 is formed on the top of the cover plate 100. The protrusion 102 is spaced apart from the electrode post 201. The connecting piece 202 has a first connecting section 2021 connected to the electrode post 201, and a second connecting section 2022 located above the first connecting section 2021 along the height direction of the cover plate 100. The second connecting section 2022 is located in the groove 101 and is used to connect to the electrode group 300.

[0097] The lead-out electrode assembly 200 includes a riveting block 203 and an upper insulating member 500. The top of the pole post 201 is riveted to the riveting block 203. The upper insulating member 500 is located between the riveting block 203 and the cover plate 100, and the protrusion 102 is spaced apart from the riveting block 203.

[0098] In particular, along the width direction of the cover plate 100, the protrusion 102 is located on one side of the rivet block 203;

[0099] Along the height direction of the cover plate 100, the distance A between the top wall of the rivet block 203 and the top wall of the cover plate 100, and the distance a between the top wall of the protrusion 102 and the top wall of the cover plate 100, satisfy the following condition: 0.2≤a / A≤1.

[0100] Along the width direction of the cover plate 100, at least one protrusion 102 is provided on both sides of the riveting block 203; the connecting piece 202 is a plurality of pieces corresponding one-to-one with each protrusion 102.

[0101] The distance B between the rivet block 203 and the protrusion 102 satisfies: B≥3mm.

[0102] Among them, along the height direction of the cover plate 100, the wall thickness t1 of the protrusion 102 and the thickness t2 of the cover plate 100 satisfy the following condition: 0.8mm < t1 < t2.

[0103] The second connecting segment 2022 and the first connecting segment 2021 are connected by a transition segment 2023;

[0104] The included angle α between the transition segment 2023 and the first connecting segment 2021 satisfies: 15°≤α≤90°, and / or the first connecting segment 2021, the second connecting segment 2022 and the transition segment 2023 are integrally formed.

[0105] Wherein, along the height direction of the cover plate 100, the distance C between the edge of the projected outline of the protrusion 102 and the edge of the projected outline of the cover plate 100 satisfies: C≥3mm.

[0106] In the above preferred embodiments, the specific configuration and arrangement of the cover plate 100, groove 101, protrusion 102, lead-out electrode assembly 200, electrode post 201, connecting piece 202, electrode group 300, electrode ear 301, housing 400, upper insulating member 500 and lower plastic member 600 can still be referred to the descriptions in the above exemplary embodiments. Furthermore, in this preferred embodiment, the beneficial effects brought about by the design of the cover plate 100, groove 101, protrusion 102, lead-out electrode assembly 200, electrode post 201, connecting piece 202, electrode group 300, electrode ear 301, housing 400, upper insulating member 500 and lower plastic member 600 can also be referred to the descriptions in the above exemplary embodiments.

[0107] The cover plate structure of this embodiment adopts the above design. Compared with the conventional technology of welding the upper surface of the connecting piece 202 to the lower surface of the pole post 201 and welding the upper surface of the bent tab 301 to the lower surface of the connecting piece 202, it reduces the total size of the pole post 201, the connecting piece 202 and the tab 301 along the height direction of the cover plate 100 after they are assembled. This improves the space utilization rate of the cover plate 100 in its own height direction, relatively increases the space for setting other components such as the electrode group 300 inside the battery, improves the space utilization rate inside the battery, and is conducive to improving the overall energy density of the battery.

[0108] An embodiment of the second aspect of this application provides a battery having the aforementioned cover structure.

[0109] In this embodiment, by setting the aforementioned cover structure, the battery can increase the space for setting other components such as the electrode assembly 300 inside the battery, improve the space utilization rate inside the battery, and thus help improve the overall energy density of the battery.

[0110] The above descriptions are merely some embodiments of this application and are not intended to limit this application. The technical features or structures in the foregoing different embodiments can be arbitrarily combined to form other specific technical solutions as needed. For those skilled in the art, this application can have various modifications and variations. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of protection of the claims of this application.

Claims

1. A cover plate structure, characterized in that: Includes a cover plate and a lead-out electrode assembly disposed on the cover plate; The lead-out electrode assembly includes an electrode post that extends through the cover plate along the height direction of the cover plate, and a connecting piece connected to the bottom of the electrode post, the connecting piece being located below the cover plate; The bottom of the cover plate is provided with a groove, and a protrusion corresponding to the groove is formed on the top of the cover plate, and the distance between the protrusion and the pole post is set. The connecting piece has a first connecting section connected to the pole post, and a second connecting section located above the first connecting section along the height direction of the cover plate. The second connecting section is located in the groove and is used to connect to the pole group.

2. The cover plate structure according to claim 1, characterized in that: The lead-out electrode assembly includes a riveting block, the top of the electrode post is riveted to the riveting block, the protrusion is spaced apart from the riveting block, and an upper insulating member is provided between the riveting block and the cover plate.

3. The cover plate structure according to claim 2, characterized in that: Along the length of the cover plate, the protrusion is located on the side of the rivet block closer to the center of the cover plate; Along the height direction of the cover plate, the distance A between the top wall of the rivet block and the top wall of the cover plate, and the distance a between the top wall of the protrusion and the top wall of the cover plate, satisfy the following condition: 0.2≤a / A≤2.

5.

4. The cover plate structure according to claim 2, characterized in that: Along the width direction of the cover plate, the protrusion is located on one side of the rivet block; Along the height direction of the cover plate, the distance A between the top wall of the rivet block and the top wall of the cover plate, and the distance a between the top wall of the protrusion and the top wall of the cover plate, satisfy the following condition: 0.2≤a / A≤1.

5. The cover plate structure according to claim 4, characterized in that: Along the width direction of the cover plate, at least one of the protrusions is provided on both sides of the rivet block; The connecting piece is a plurality of pieces that correspond one-to-one with each of the protrusions.

6. The cover plate structure according to claim 3 or 4, characterized in that: The distance B between the rivet block and the protrusion satisfies: B≥3mm.

7. The cover plate structure according to any one of claims 1 to 5, characterized in that: Along the height direction of the cover plate, the wall thickness t1 of the protrusion and the thickness t2 of the cover plate satisfy the following condition: 0.8mm < t1 < t2.

8. The cover plate structure according to any one of claims 1 to 5, characterized in that: The first connecting segment and the second connecting segment are arranged in parallel, and the second connecting segment and the first connecting segment are connected by a transition segment; The included angle α between the transition section and the first connecting section satisfies: 15°≤α≤90°, and / or, the first connecting section, the second connecting section and the transition section are integrally formed.

9. The cover plate structure according to any one of claims 1 to 5, characterized in that: Along the height direction of the cover plate, the distance C between the edge of the projected outline of the protrusion and the edge of the projected outline of the cover plate satisfies: C≥3mm.

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

Images