Cover plate assembly, battery and electric device

Abstract

The invention relates to the technical field of batteries, in particular to a cover plate assembly, a battery and an electric device. The cover plate assembly comprises a cover plate body, a connecting piece and a pole, the cover plate body comprises a base plate and a plurality of side plates vertically arranged on the base plate, the base plate and the side plates jointly define a containing space, the base plate is in a step shape, the pole penetrates through the base plate, and the connecting piece is arranged in the containing space and connected with the pole. According to the cover plate assembly, the base plate is arranged to be in the step shape, the deformation resistance of the cover plate body is improved, the bending rigidity and the deformation resistance of the base plate can be greatly improved through the bevel enhancement effect, and the deformation resistance of the cover plate body is improved; the accommodating space is formed by the surrounding of the substrate and the side plates, and the connecting piece is arranged in the accommodating space, so that the condition that the connecting piece occupies the internal space of the shell can be avoided, and the volume of the pole group which can be accommodated in the shell is increased, so that the capacity of the battery is improved.

Description

Technical Field

[0001] This invention relates to the field of battery technology, and in particular to a cover plate assembly, a battery, and an electrical device. Background Technology

[0002] In lithium-ion batteries, the cover plate assembly is a key component. It is connected to the housing to encapsulate the electrode assembly inside the housing. At the same time, the terminals on the cover plate assembly enable the electrical connection between the electrode assembly and the external circuit. Its structural design is directly related to the battery's resilience, space utilization, and long-term reliability.

[0003] Currently, the industry generally uses flat metal covers (such as aluminum alloy or nickel-plated steel), which are characterized by thin flat plates of uniform thickness. While this structure has the advantages of convenient processing and low cost, it also has disadvantages such as insufficient resistance to deformation and poor spatial adaptability, becoming a key bottleneck for increasing battery capacity.

[0004] Furthermore, currently, the electrical connection between the terminal post and the electrode tabs of the battery pack is typically achieved using connectors (such as metal busbars or connecting tabs) located within the casing. Specifically, one end of the connector is welded to the bottom of the terminal post, and the other end is welded to the electrode tab, forming a current conduction path. However, the connector occupies a certain amount of space within the casing, affecting the improvement of battery capacity.

[0005] Therefore, there is an urgent need for a cover plate assembly, battery, and power supply device to solve the above problems. Summary of the Invention

[0006] The purpose of this invention is to provide a cover plate assembly, a battery, and an electrical device that can improve the deformation resistance of the cover plate body, avoid the connector occupying the internal space of the housing, and increase the battery capacity and energy density.

[0007] To achieve the above objectives, the following technical solution is provided:

[0008] A cover plate assembly, comprising:

[0009] The cover plate body includes a base plate and a plurality of side plates erected on the base plate. The base plate and the side plates together enclose an accommodating space. The base plate is stepped.

[0010] A connector and a pole, the pole passing through the substrate, the connector being disposed within the accommodating space and connected to the pole.

[0011] As an optional solution, the substrate includes a first flat plate, a first vertical plate, a second flat plate, and a second vertical plate connected in sequence, and the number of pole posts is multiple, with at least one pole post disposed on the first flat plate, the first vertical plate, and the second flat plate respectively.

[0012] As an optional solution, the cover plate assembly further includes a riveting component, which includes a third plate, a third upright plate, and a fourth plate connected in sequence. The third plate is disposed outside the first plate, the third upright plate is disposed outside the first upright plate, and the fourth plate is disposed outside the second plate. All of the pole posts are connected to the riveting component.

[0013] As an optional feature, the riveting component further includes:

[0014] The fourth upright plate is connected to the fourth flat plate and is disposed on the outside of the second upright plate.

[0015] As an optional solution, the cover plate assembly further includes a first insulating member, the first insulating member being provided with a receiving groove, the riveting member being disposed within the receiving groove, and the receiving groove being provided with a notch.

[0016] As an optional solution, the maximum distance between the outer side of the third upright plate and the first flat plate in the first direction is L1, and the maximum distance between the outer side of the third upright plate and the outer side of the second upright plate in the first direction is L2, 15mm≤L2-L1≤100mm;

[0017] And / or, the dimension of the substrate in the first direction is L3, 0.4≤(L2+L1) / L3≤0.67.

[0018] As an optional solution, the distance between the outer side of the fourth plate and the outer side of the first plate in the second direction is H1, and the dimension of the cover plate body in the second direction is H2, where 0.3≤H1 / H2≤0.6.

[0019] A battery includes a housing and an electrode assembly, and also includes the aforementioned cover assembly, wherein the electrode assembly is disposed within the housing, the housing has an opening, and the cover assembly covers the opening.

[0020] As an optional solution, the electrode assembly includes a tab, which is connected to the pole post and / or the connector.

[0021] An electrical device includes a main body and the aforementioned battery.

[0022] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0023] The cover plate assembly provided by the present invention improves the deformation resistance of the cover plate body by setting the substrate in a stepped shape. It can significantly improve the bending stiffness and deformation resistance of the substrate by utilizing the "angle enhancement effect", thereby improving the deformation resistance of the cover plate body. By setting the substrate and side plate together to form an accommodating space, and setting the connector in the accommodating space, it can avoid the connector occupying the internal space of the housing, thereby increasing the volume of the electrode assembly that can be accommodated in the housing, so as to improve the battery capacity.

[0024] The battery provided by the present invention, by applying the above-mentioned cover plate assembly, has good resistance to deformation and high capacity and energy density.

[0025] The electrical device provided by the present invention, by using the above-mentioned battery, has high resistance to deformation and high capacity, thereby improving the endurance and service life of the electrical device. Attached Figure Description

[0026] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments of the present invention will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the content of the embodiments of the present invention and these drawings without creative effort.

[0027] Figure 1 This is a schematic diagram of the battery structure provided in Embodiment 1 of the present invention;

[0028] Figure 2 This is a partial cross-sectional view of the battery provided in Embodiment 1 of the present invention;

[0029] Figure 3 This is a first structural schematic diagram of the cover plate assembly provided in Embodiment 1 of the present invention;

[0030] Figure 4 This is a schematic diagram of the second structure of the cover plate assembly provided in Embodiment 1 of the present invention;

[0031] Figure 5 This is an exploded view of the cover plate assembly provided in Embodiment 1 of the present invention;

[0032] Figure 6 This is a schematic diagram of the shell structure provided in Embodiment 1 of the present invention;

[0033] Figure 7 This is a schematic diagram of the third structure of the cover plate assembly provided in Embodiment 1 of the present invention;

[0034] Figure 8 for Figure 7 Sectional view at point AA;

[0035] Figure 9 This is a structural schematic diagram of the vehicle provided in Embodiment 2 of the present invention.

[0036] Figure label:

[0037] 10000, vehicles;

[0038] 1000, battery;

[0039] 100. Cover plate assembly;

[0040] 10. Cover plate body; 1001. Accommodating space; 11. Base plate; 111. First flat plate; 112. First upright plate; 113. Second flat plate; 114. Second upright plate; 12. Side plate; 13. Positioning edge;

[0041] 20. Pole post;

[0042] 30. Riveted component; 31. Third flat plate; 32. Third vertical plate; 33. Fourth flat plate; 34. Fourth vertical plate;

[0043] 40. First insulating element; 41. Receiving groove; 411. Notch;

[0044] 50. Second insulating component;

[0045] 60. Sealing components;

[0046] 70. Connectors;

[0047] 200, Shell; 2001, Stepped opening; 210, First side; 2101, Explosion-proof hole; 211, Main body; 212, Bending part; 2121, Reinforcing structure; 220, Second side; 221, First side edge; 222, Second side edge;

[0048] 300, Electrode Group; 310, Electrode Sheet;

[0049] 2000, controller; 3000, motor. Detailed Implementation

[0050] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0051] In the description of this application, it should be understood that if terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" appear, these terms indicate the orientation or positional relationship 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 of this application.

[0052] Furthermore, where the terms "first" and "second" appear, these terms are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, where the term "multiple" appears, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0053] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0054] In this application, unless otherwise expressly specified and limited, the use of descriptions such as "above" or "below" the second feature indicates that the first and second features are in direct contact or indirect contact via an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. Similarly, "below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0055] It should be noted that if an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. If an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. If so, the terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application are for illustrative purposes only and do not represent the only possible implementation.

[0056] Example 1

[0057] like Figures 1-3 As shown, this embodiment provides a battery 1000, which includes a housing 200 and an electrode assembly 300. The electrode assembly 300 is disposed within the housing 200, and the housing 200 serves to support and protect the electrode assembly 300. The housing 200 can be made of plastic or metal. When the housing 200 is made of metal, it has better heat dissipation performance, higher strength, and can provide its own support.

[0058] The electrode assembly 300 in this application can be formed by winding or by stacking. Generally, the electrode assembly 300 includes at least a positive electrode, a separator, and a negative electrode.

[0059] Optionally, the housing 200 has at least one opening, and the battery 1000 also includes a cover assembly 100, which covers the opening of the housing 200. The electrode group 300 is connected to the cover assembly 100, and the cover assembly 100 is connected to the main body of the external electrical device, so as to realize the function of the battery 1000 supplying power to the main body of the electrical device.

[0060] Optionally, the cover assembly 100 includes a cover body 10, which covers the opening of the housing 200 to form a sealed structure with the housing 200, preventing external water, dust, and gas from entering the interior of the battery 1000, and at the same time preventing the electrolyte inside the battery 1000 from leaking.

[0061] Optionally, the cover plate assembly 100 further includes a terminal post 20 and a riveting member 30. The terminal post 20 includes a column portion and a plate portion. The column portion passes through the cover plate body 10, and the riveting member 30 is disposed on the outer side of the cover plate body 10. The terminal post 20 passes through the inner side of the cover plate body 10 and is riveted to the riveting member 30. The cover plate body 10 is sandwiched in the middle by the plate portion and the riveting member 30, so that the terminal post 20 and the riveting member 30 are respectively assembled with the cover plate body 10. The plate portion of the terminal post 20 is connected to the electrode group 300 through the electrode tab 310. The electrode group 300 can be connected to the external circuit through the terminal post 20, so that the battery 1000 can be charged and discharged.

[0062] Optionally, the cover assembly 100 also includes a connector 70. The electrode group 300 is provided with a tab 310. The connector 70 is connected to the terminal post 20. The tab 310 is connected to the terminal post 20 and / or the connector 70. By providing the connector 70, the risk of tab 310 breakage can be reduced and the spatial layout of tab 310 can be flexibly adapted. In addition, the connector 70 can form a "surface contact" with tab 310, which greatly reduces the conduction resistance, thereby significantly reducing current transmission loss, improving conduction efficiency, and improving the charging and discharging efficiency of battery 1000.

[0063] In related technologies, flat metal covers (such as aluminum alloy or nickel-plated steel) are commonly used, which have disadvantages such as insufficient resistance to deformation and poor space adaptability. In addition, the setting of the connector 70 occupies a certain space inside the housing 200, which affects the improvement of the battery 1000 capacity.

[0064] To solve the above problems, such as Figures 1-5 As shown, the cover plate body 10 provided in this embodiment includes a base plate 11 and a plurality of side plates 12 erected on the base plate 11. The side plates 12 are connected to the housing 200. The base plate 11 and the side plates 12 together form an accommodating space 1001. The base plate 11 is stepped. The pole post 20 passes through the base plate 11. The connector 70 is disposed in the accommodating space 1001 and connected to the pole post 20.

[0065] By setting the substrate 11 in a stepped shape, the deformation resistance of the cover plate body 10 is improved. The bending stiffness and deformation resistance of the substrate 11 can be greatly improved by utilizing the "angle enhancement effect", thereby improving the deformation resistance of the cover plate body 10. By setting the substrate 11 and the side plate 12 together to form the accommodating space 1001, and setting the connector 70 in the accommodating space 1001, the connector 70 can avoid occupying the internal space of the housing 200, thereby increasing the volume of the electrode group 300 that can be accommodated in the housing 200, so as to improve the capacity and energy density of the battery 1000.

[0066] In this embodiment, the connector 70 and the tab 310 are both stepped, and the first terminal 20, the second terminal 20, and the tab 310 are all connected to the connector 70 to maximize the connection area between the tab 310 and the connector 70, thereby further improving the current carrying capacity to meet the requirements of high-capacity fast charging. In other embodiments, the connector 70 or the tab 310 can be set as stepped on its own.

[0067] Optionally, the cover plate body 10 is formed by stamping, which has advantages such as high production efficiency and high material utilization.

[0068] like Figure 1 , Figure 2 and Figure 6As shown, the housing 200 includes a first side 210 and a second side 220, which are alternately arranged and connected end to end to form a shell-like structure with at least one stepped opening 2001. The cover plate body 10 covers the stepped opening 2001. By alternating the first side 210 and the second side 220 and connecting end to end to form a shell-like structure with at least one stepped opening 2001, compared with the traditional rectangular structure, the volume of the electrode assembly 300 that the housing 200 can accommodate is increased by setting the opening as a stepped opening 2001, thereby increasing the capacity of the battery 1000.

[0069] In this embodiment, there are two first side surfaces 210 arranged along a first direction, and two second side surfaces 220 arranged along a third direction. The first side surfaces 210 and the second side surfaces 220 are alternately connected to form a shell-like structure with two stepped openings 2001 along a second direction. This shell-like structure is used to accommodate the electrode assembly 300, thereby further increasing the volume of the housing 200 that can accommodate the electrode assembly 300 and further increasing the capacity of the battery 1000. The battery 1000 includes two cover plate assemblies 100, which are disposed on the corresponding stepped openings 2001. The electrode post 20 on one cover plate assembly 100 is a positive electrode post, and the electrode post 20 on the other cover plate assembly 100 is a negative electrode post.

[0070] Optionally, one of the first side surfaces 210 includes a connected main body 211 and a bent portion 212, and the second side surface 220 includes adjacent first side edges 221 and second side edges 222, the second side edge 222 being a stepped edge. The main body 211 is connected to the first side edge 221, the bent portion 212 is connected to the second side edge 222, and partially blocks the stepped opening 2001. The cover plate body 10 is connected to the bent portion 212. By setting one side surface as the main body 211 and the bent portion 212, the end material removal can be reduced, increasing the material utilization rate of the housing 200; at the same time, the size of the cover plate assembly 100 can be reduced, lowering the component cost. It is understood that the stepped edges of the two second side surfaces 220 and the sides of the two first side surfaces 210 together form the aforementioned stepped opening 2001.

[0071] During assembly, one side of the bent portion 212 is first bent and welded to one end of the second side 220. After the electrode assembly 300 is installed in the housing, the other side of the bent portion 212 is bent and welded to the other end of the second side 220.

[0072] Optionally, the bent portion 212 further includes a reinforcing structure 2121, which is disposed on the bent portion 212 to improve the strength and resistance to deformation of the bent portion 212. Optionally, the reinforcing structure 2121 is formed by stamping.

[0073] Optionally, at least one explosion-proof hole 2101 is provided on at least one first side 210. An explosion-proof valve is welded to the inner wall of the explosion-proof hole 2101. When an abnormality occurs inside the battery 1000, the gas pressure inside the casing 200 reaches the explosion-proof threshold of the explosion-proof valve. The explosion-proof valve opens, and the gas is discharged through the explosion-proof hole 2101, releasing the internal pressure of the casing 200, preventing the battery 1000 from thermal runaway and exploding or catching fire, and improving the safety of the battery 1000. Optionally, the explosion-proof hole 2101 is located in the middle of the first side 210 to shorten the exhaust path.

[0074] Optionally, the substrate 11 includes a first flat plate 111, a first vertical plate 112, a second flat plate 113, and a second vertical plate 114 connected in sequence. The number of electrode posts 20 is multiple, with at least one electrode post 20 disposed on each of the first flat plate 111, the first vertical plate 112, and the second flat plate 113. By disposing at least one electrode post 20 on each of the first flat plate 111, the first vertical plate 112, and the second flat plate 113, the current distribution of the battery 1000 can be optimized, improving the charging and discharging efficiency and power limit of the battery 1000, reducing localized high temperatures, and ensuring temperature stability.

[0075] Optionally, the second upright plate 114 protrudes from the terminal post 20 and / or the riveting member 30 located on the second flat plate 113, thus effectively protecting the terminal post 20 and the riveting member 30 through the cover plate body 10, reducing the possibility of the terminal post 20 / riveting member 30 being damaged by bumps or knocks during the manufacturing process. Furthermore, during the assembly of the battery 1000, space is provided for the connecting piece, thereby saving module assembly space, increasing module assembly efficiency, and ultimately improving the performance of the battery 1000. It is understood that the connecting piece is used to connect with the riveting member 30 to connect the positive and negative terminals of the battery 1000 in series or parallel to form the voltage and capacity required for the module. Optionally, the connecting piece can be a copper connecting piece, a nickel connecting piece, an aluminum-nickel alloy sheet, etc.

[0076] Optionally, a positioning edge 13 is provided at the position of the side plate 12 away from the first flat plate 111, the first upright plate 112 and the second flat plate 113. That is, the positioning edge 13 is not provided at the position of the side plate 12 away from the second upright plate 114. When the shell is assembled, the positioning edge 13 is inserted into the shell 200 to ensure the smooth assembly of the shell.

[0077] Optionally, the riveting component 30 includes a third plate 31, a third vertical plate 32, and a fourth plate 33 connected in sequence. The third plate 31 is located outside the first plate 111, the third vertical plate 32 is located outside the first vertical plate 112, and the fourth plate 33 is located outside the second plate 113. Multiple pole posts 20 are connected to the riveting component 30, improving integration, reducing connection points, and lowering the risk of loose connections. The outer side of the cover plate body 10 is the side of the cover plate body 10 that faces away from the pole group 300.

[0078] Optionally, the riveting component 30 also includes a fourth upright plate 34, which is connected to the fourth flat plate 33. The fourth upright plate 34 is disposed on the outside of the second upright plate 114. By providing the fourth upright plate 34, the weldable area of ​​the riveting component 30 can be increased, thereby improving the flow capacity of the cover plate assembly 100.

[0079] Optionally, the cover plate assembly 100 further includes a first insulating member 40, which is disposed between the riveting member 30 and the base plate 11 to ensure insulation between the riveting member 30 and the cover plate body 10, preventing short circuit between the riveting member 30 and the cover plate body 10. Optionally, the first insulating member 40 is provided with a receiving groove 41, and the riveting member 30 is disposed within the receiving groove 41 to prevent displacement of the riveting member 30 and to save space and simplify assembly. Optionally, the receiving groove 41 is provided with a notch 411 to ensure smooth assembly of the riveting member 30 and the first insulating member 40.

[0080] Optionally, such as Figure 7 and Figure 8 As shown, the maximum distance between the outer side of the third upright plate 32 and the first flat plate 111 in the first direction is L1, and the maximum distance between the outer side of the third upright plate 32 and the outer side of the second upright plate 114 in the first direction is L2, where 15mm ≤ L2 - L1 ≤ 100mm. This ensures a good capacity increase for the battery 1000 and sufficient installation space for the third flat plate 31. When the value of L2 - L1 is too small, the first flat plate 111 is too long, affecting the capacity increase of the battery 1000. When the value of L2 - L1 is too large, the first flat plate 111 is too short, limiting the installation space of the third flat plate 31 of the riveting component 30 and hindering heat dissipation. For example, the value of L2 - L1 can be 15mm, 20mm, 25mm, 30mm, 35mm, 40mm, 45mm, 50mm, 55mm, 60mm, 65mm, 70mm, 75mm, 80mm, 85mm, 90mm, 95mm, or 100mm. In other embodiments, the values ​​of L2-L1 can also be any other value between 15mm and 100mm.

[0081] Optionally, the substrate 11 has a dimension of L3 in the first direction, where 0.4 ≤ (L2 + L1) / L3 ≤ 0.67, to ensure the dimensional proportion of the riveting member 30 position meets the fast charging overcurrent requirements of the battery 1000. For example, the value of (L2 + L1) / L3 can be 0.4, 0.45, 0.5, 0.55, 0.6, 0.65, or 0.67. In other embodiments, the value of (L2 + L1) / L3 can also be any other value between 0.4 and 0.67.

[0082] Optionally, the distance between the outer side of the fourth plate 33 and the outer side of the first plate 111 in the second direction is H1, and the dimension of the cover body 10 in the second direction is H2, 0.3≤H1 / H2≤0.6, to ensure that the riveting part 30 can meet the current requirements and that the cover body 10 has good forming quality. When the value of H1 / H2 is too small, the height ratio of the third vertical plate 32 of the riveting part 30 is insufficient, which cannot meet the current requirements; it increases the impact on the size of the electrode group 300 and affects the capacity improvement of the battery 1000; when the value of H1 / H2 is too large, the height ratio of the third vertical plate 32 of the riveting part 30 is too large, which increases the stamping difficulty of the cover body 10, and at the same time increases the weight and cost of the cover body 10. For example, the value of H1 / H2 can be 0.3, 0.32, 0.34, 0.36, 0.38, 0.4, 0.42, 0.44, 0.46, 0.48, 0.5, 0.52, 0.54, 0.56, 0.58, or 0.6. In other embodiments, the value of H1 / H2 can also be any other value between 0.3 and 0.6.

[0083] Optionally, the included angle between the second flat plate 113 and the second vertical plate 114 is N1, where 110° ≤ N1 ≤ 120°, to ensure a better forming effect for the cover plate body 10 and a better capacity increase effect for the battery 1000. For example, the value of N1 can be 110°, 111°, 112°, 113°, 114°, 115°, 116°, 117°, 118°, 119°, or 120°. In other embodiments, the value of N1 can also be any other value between 110° and 120°.

[0084] Optionally, the included angle between the first flat plate 111 and the first upright plate 112 is N2, where 90° ≤ N ≤ 105°, to ensure a better forming effect for the cover plate body 10 and a better capacity increase effect for the battery 1000. Exemplarily, the value of N2 can be 90°, 91°, 92°, 93°, 94°, 95°, 96°, 97°, 98°, 99°, 100°, 101°, 102°, 103°, 104°, or 105°. In other embodiments, the value of N2 can also be any other value between 90° and 105°.

[0085] like Figure 7 As shown, the cover plate body 10 has a dimension of W in the second direction, meaning the thickness of the battery 1000 is W, where 16mm ≤ W ≤ 120mm. This avoids the disadvantages of the battery 1000 being too thin, leading to insufficient structural strength, limited capacity, and performance; and avoids the disadvantages of the battery 1000 being too thick, leading to low heat dissipation efficiency and susceptibility to thermal runaway. For example, the value of W can be 16mm, 17mm, 18mm, 19mm, 20mm, 30mm, 40mm, 50mm, 60mm, 70mm, 80mm, 90mm, 100mm, 110mm, or 120mm. In other embodiments, the value of W can also be any other value between 16mm and 120mm.

[0086] like Figure 8 As shown, the wall thickness of the substrate 11 is T1, which is 2 mm, to ensure that the cover plate body 10 has sufficient strength.

[0087] Optionally, the wall thickness of the riveting member 30 is T2, where 2mm ≤ T2 ≤ 3.5mm, to ensure that the riveting member 30 has sufficient strength and meets the requirements for current carrying capacity. Exemplarily, the value of T2 can be 2mm, 2.1mm, 2.2mm, 2.3mm, 2.4mm, 2.5mm, 2.6mm, 2.7mm, 2.8mm, 2.9mm, 3mm, 3.1mm, 3.2mm, 3.3mm, 3.4mm, or 3.5mm. In other embodiments, the value of T2 can also be any other value between 2mm and 3.5mm.

[0088] Optionally, the wall thickness of the connector 70 is T3, where 2mm ≤ T3 ≤ 3.5mm, to ensure that the connector 70 has sufficient strength and sufficient flow capacity. Exemplarily, the value of T3 can be 2mm, 2.1mm, 2.2mm, 2.3mm, 2.4mm, 2.5mm, 2.6mm, 2.7mm, 2.8mm, 2.9mm, 3mm, 3.1mm, 3.2mm, 3.3mm, 3.4mm, or 3.5mm. In other embodiments, the value of T3 can also be any other value between 2mm and 3.5mm.

[0089] Table 1

[0090]

[0091]

[0092] Table 1 shows the relationships between the wall thickness T1 of the substrate 11, the wall thickness T2 of the riveting member 30, the wall thickness T3 of the connector 70, H1 / H2, L2-L1, (L2+L1) / L3, the included angle N1 between the second plate 113 and the second vertical plate 114, the included angle N2 between the first plate 111 and the first vertical plate 112, and the dimension W of the cover body 10 in the second direction. Examples 1-6 show the values ​​of T1, T2, T3, H1 / H2, L2-L1, (L2+L1) / L3, N1, N2, and W when the battery 1000 has a yield rate >98%; Comparative Examples 1-6 show the values ​​of H1 / H2, L2-L1, and (L2+L1) / L3 when the battery 1000 has a yield rate <98%.

[0093] Specifically, after the battery 1000 is assembled, the molding quality and appearance quality of the battery 1000 are tested to detect the yield rate of the battery 1000 in the process.

[0094] In Examples 1-6, the values ​​of T1, T2, T3, H1 / H2, L2-L1, (L2+L1) / L3, N1, N2, and W are all within the defined range. The yield rate of battery 1000 is >98%, and no abnormalities such as mismatch or strength between the cover plate body 10 and the shell 200 are observed. The riveting parts 30, terminal posts 20, electrode groups 300, and tabs 310 are all undamaged and undeformed. The current carrying capacity of the cover plate assembly 100 meets the requirements of battery 1000.

[0095] In Comparative Example 1, the value of H1 / H2 is too small, the height ratio of the third vertical plate 32 of the riveting component 30 is insufficient, and it cannot meet the overcurrent requirements; the size of the electrode group 300 is affected, which affects the capacity improvement of the battery 1000.

[0096] In Comparative Example 2, the value of H1 / H2 is too large, and the height ratio of the third vertical plate 32 of the riveting part 30 is too large, which increases the stamping difficulty of the cover plate body 10, and also increases the weight and cost of the cover plate body 10.

[0097] In Comparative Example 3, the L2-L1 value is too small, and the first plate 111 is too long, which affects the capacity improvement of the battery 1000.

[0098] In Comparative Example 4, the L2-L1 value is too large, the first plate 111 is too short, the installation space of the third plate 31 of the riveting component 30 is limited, and it is not conducive to heat dissipation.

[0099] In Comparative Example 5, the value of (L2+L1) / L3 is too small, the proportion of riveting part 30 is insufficient, and it cannot meet the fast charging overcurrent requirements of battery 1000.

[0100] In Comparative Example 6, the value of (L2+L1) / L3 is too large, the proportion of riveting part 30 is too large, and the capacity increase of battery 1000 is small.

[0101] Optionally, the cover plate assembly 100 also includes a seal 60, which is sandwiched between the electrode post 20 and the cover plate body 10. The seal 60 can insulate and isolate the electrode post 20 and the cover plate body 10 to prevent short circuit between the electrode post 20 and the cover plate body 10. At the same time, the seal 60 can seal the gap between the post and the cover plate body 10 to prevent leakage of electrolyte or gas.

[0102] Optionally, the cover plate assembly 100 further includes a second insulating member 50, which is disposed between the pole group 300 and the cover plate body 10. The second insulating member 50 can abut against the pole group 300, fix the pole group 300, prevent the pole group 300 from shifting, and prevent the pole group 300 and the cover plate body 10 from short-circuiting.

[0103] Example 2

[0104] This embodiment provides an electrical device, which includes a main body and a battery 1000 provided in Embodiment 1. The battery 1000 can provide power to the main body of the electrical device, thereby enabling the main body of the electrical device to automatically complete preset actions through power, ensuring good performance of the main body of the electrical device, and ensuring the service life and safety performance of the electrical device.

[0105] Specifically, the main body of the electrical device can be a vehicle, mobile phone, portable device, laptop, ship, spacecraft, electric toy, or power tool, etc. Vehicles can be gasoline-powered cars, natural gas-powered cars, or new energy vehicles; new energy vehicles can be pure electric vehicles or hybrid electric 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.; power tools include metal cutting power tools, grinding power tools, assembly power tools, and railway power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, or electric planers, etc. This embodiment does not limit the main body of the aforementioned electrical device.

[0106] The following examples are for illustrative purposes only. Figure 9 As shown, an embodiment of this application will be described using a vehicle 10000 as the main body of an electrical device. A battery 1000 is disposed inside the vehicle 10000, and the battery 1000 can be located at the bottom, head, or tail of the vehicle 10000. There can be one or more batteries 1000, and these batteries can be connected in series, in parallel, or in a mixed configuration. A mixed configuration means that some of the batteries 1000 are connected in series and others in parallel.

[0107] Battery 1000 can be used to power vehicle 10000, for example, battery 1000 can serve as the operating power source for vehicle 10000. Vehicle 10000 may also include controller 2000 and motor 3000, controller 2000 is used to control battery 1000 to power motor 3000, for example, to meet the power needs of vehicle 10000 during startup, navigation and driving.

[0108] In some embodiments of this application, the battery 1000 can not only serve as the operating power source for the vehicle 10000, but also as the driving power source for the vehicle 10000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 10000.

[0109] Note that in the description of this specification, references to terms such as "some embodiments," "other embodiments," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0110] The above description is merely a preferred embodiment of the present invention and the technical principles employed. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and various obvious changes, readjustments, and substitutions can be made without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments, and may include many other equivalent embodiments without departing from the concept of the present invention, the scope of which is determined by the scope of the appended claims.

Claims

1. A cover plate assembly, characterized in that, include: The cover body (10) includes a base plate (11) and a plurality of side plates (12) erected on the base plate (11). The base plate (11) and the side plates (12) together form an accommodating space (1001). The base plate (11) is stepped. A connector (70) and a pole (20) are provided, the pole (20) being inserted through the substrate (11), and the connector (70) being disposed within the accommodating space (1001) and connected to the pole (20).

2. The cover plate assembly according to claim 1, characterized in that, The substrate (11) includes a first plate (111), a first vertical plate (112), a second plate (113) and a second vertical plate (114) connected in sequence. There are multiple pole posts (20), and at least one pole post (20) is provided on the first plate (111), the first vertical plate (112) and the second plate (113).

3. The cover plate assembly according to claim 2, characterized in that, The cover plate assembly further includes a riveting member (30), which includes a third plate (31), a third upright plate (32), and a fourth plate (33) connected in sequence. The third plate (31) is disposed on the outside of the first plate (111), the third upright plate (32) is disposed on the outside of the first upright plate (112), and the fourth plate (33) is disposed on the outside of the second plate (113). The plurality of pole posts (20) are all connected to the riveting member (30).

4. The cover plate assembly according to claim 3, characterized in that, The riveting component (30) also includes: The fourth upright plate (34) is connected to the fourth flat plate (33), and the fourth upright plate (34) is disposed on the outside of the second upright plate (114).

5. The cover plate assembly according to claim 3, characterized in that, The cover plate assembly further includes a first insulating member (40), the first insulating member (40) being provided with a receiving groove (41), the riveting member (30) being disposed in the receiving groove (41), and the receiving groove (41) being provided with a notch (411).

6. The cover plate assembly according to claim 3, characterized in that, The maximum distance between the outer side of the third upright plate (32) and the first flat plate (111) in the first direction is L1, and the maximum distance between the outer side of the third upright plate (32) and the outer side of the second upright plate (114) in the first direction is L2, 15mm≤L2-L1≤100mm; And / or, the dimension of the substrate (11) in the first direction is L3, 0.4≤(L2+L1) / L3≤0.

67.

7. The cover plate assembly according to claim 3, characterized in that, The distance between the outer side of the fourth plate (33) and the outer side of the first plate (111) in the second direction is H1, and the dimension of the cover plate body (10) in the second direction is H2, 0.3≤H1 / H2≤0.

6.

8. A battery comprising a casing (200) and an electrode assembly (300), characterized in that, It also includes a cover plate assembly as described in any one of claims 1-7, wherein the pole group (300) is disposed within the housing (200), the housing (200) is provided with an opening, and the cover plate assembly covers the opening.

9. The battery according to claim 8, characterized in that, The electrode assembly (300) includes a tab (310) connected to the pole post (20) and / or the connector (70).

10. An electrical appliance, comprising an electrical appliance body, characterized in that, It also includes the battery as described in claim 8 or 9.

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